Title of Invention	A RECIPROCATING COMPRESSOR
Abstract	A reciprocating compressor comprises : a shell (10) to which a suction pipe (SP) and a discharge conduit (DP) are connected ; a reciprocating motor (20) comprising a stator (21) having an inner and outer stators (21 A, 21B) installed inside the shell, and an armature (22) disposed in the air gap between the two stators ; a compressor unit (30) comprising a piston (31) coupled to the armature (22), and having an inner flowing passage (31A) extending into the piston, and a cylinder (32) supported inside of the motor (20) so that the piston is slidable into the cylinder (32); a frame unit (40) supporting the motor (20) and the compressor unit (30) and a spring unit (50) elastically supporting the armature (22) towards motion direction ; characterised by a suction gas guide system (100) comprising a gas guide conduit (110) having both ends located inside the suction pipe (SP) and in the inner flowing passage (31A) of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston.

Title of Invention

A RECIPROCATING COMPRESSOR

Abstract

A reciprocating compressor comprises : a shell (10) to which a suction pipe (SP) and a discharge conduit (DP) are connected ; a reciprocating motor (20) comprising a stator (21) having an inner and outer stators (21 A, 21B) installed inside the shell, and an armature (22) disposed in the air gap between the two stators ; a compressor unit (30) comprising a piston (31) coupled to the armature (22), and having an inner flowing passage (31A) extending into the piston, and a cylinder (32) supported inside of the motor (20) so that the piston is slidable into the cylinder (32); a frame unit (40) supporting the motor (20) and the compressor unit (30) and a spring unit (50) elastically supporting the armature (22) towards motion direction ; characterised by a suction gas guide system (100) comprising a gas guide conduit (110) having both ends located inside the suction pipe (SP) and in the inner flowing passage (31A) of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston.

Full Text	1 A RECIPROCATING COMPRESSOR TECHNICAL FIELD The present invention relates to a reciprocating compressor, and particularly, to a suction gas guiding system for a reciprocating compressor which is suitable for introducing suction gas into a compressor unit smoothly, and for reducing suction noise in case of installing the compressor unit inside a reciprocating motor. BACKGROUND ART Generally, a reciprocating compressor can be divided into a compressor which compresses and discharges the sucked gas by changing a rotating movement of a driving motor into a reciprocating motion of a piston, and a compressor which compresses and discharges the sucked gas by making the piston undergo reciprocating movement while the driving motor undergoes linear reciprocating movement. Figure 1 is a transverse cross-sectional view showing an embodiment of the reciprocating compressor in which the driving motor undergoes the linear reciprocating movement. As shown therein, a conventional reciprocating compressor comprises a shell 10 in which a suction pipe (SP) and a discharge conduit (DP) are communicated with each other ; a reciprocating motor 20 fixed inside the shell 10; a compressor unit 30 installed inside the reciprocating motor 10, sucking, 2 compressing, and discharging gas; a frame unit 40 supporting the reciprocating motor 20 and the compressor unit 30; and a spring unit 50 elastically supporting an armature 22 of the reciprocating motor 20 in motion direction and guiding a resonance. The reciprocating motor 20 includes a stator 21 including an inner stator 21A and an outer stator 21B, and an armature 22 disposed in a gap between the inner stator 21A and the outer stator 21B and undergoing a reciprocating movement. The compressor unit 30 comprises a piston 31. coupled to a magnet supporting member 22A of the reciprocating motor 20 and undergoing the reciprocating movement together with the magnet supporting member 22A; a cylinder 32 fixed on a front frame 41 which will be described later and forming a compressing space with the piston; a suction vaive 33 installed on front end of the piston and restricting the suction of gas by opening/closing a gas passing hole 31b of the piston which will be described later; and a discharge valve assembly 34 disposed on the front end of the cylinder 32, whereby covering the compressing space, and restricting the discharge of compressed gas. An inner flowing passage 31a communicating with the suction pipe (SP) is formed to a certain depth inside the piston 31, and the gas passing hole 31b communicated with the inner flowing passage 31a and penetrated to front end surface of the piston 31 is formed. The frame unit 40 includes a front frame 41 contacting to front surfaces of the inner stator 21A and of the outer stator 21B, whereby supporting the stators 3 together, and in which the cylinder 32 is inserted; a middle frame 42 contacting to rear surface of the outer stator 21B, whereby supporting the outer stator 21B; and a rear frame 43 coupled to the middle frame 42 and supporting rear end of a rear spring 52 which will be described later. The spring unit 50 includes front spring 51 having both ends supported by the front surface of coupled part of the magnet supporting member 22A and the piston 31 and by the corresponding inner surface of the front frame 41, and a rear spring 52 having both ends supported by rear surface of the coupled part of the magnet supporting member 22A and the piston 31, and by corresponding front surface of the rear frame 43. Reference numeral 22B designates a magnet. The conventional reciprocating compressor as described above is operated as follows. That is, when an electric current is applied to the winding coil 21C installed on the outer stator 21B of the reciprocating motor 20 and a flux is generated between the inner stator 21A and the outer stator 21B, whereby the armature 22 located in the gap between the inner stator 21A and the outer stator 21B moves in accordance with the direction of the flux and undergoes reciprocating movement by the spring unit 50. And accordingly, the piston 22 coupled to the armature 22 undergoes reciprocating movement inside the cylinder 32, so that a volume variance is generated inside the compressing space, accordingly the refrigerant gas is sucked into the compressing space, then compressed and discharged. 4 The refrigerant gas is sucked inside the shell 10 through the suction pipe (SP) during the suction stroke of the piston, and the gas is sucked into the compressing space of the cylinder 32 as opening the suction valve 33 through the inner flowing passage 31a of the piston 31 and through the gas passing hole 31b. Then, the gas is compressed to a certain level during the compress stroke of the piston, and discharged through the discharge conduit 34 as opening the discharge valve assembly 34. And the whole process is repeated. However, in the conventional reciprocating compressor as described above, the refrigerant gas sucked into the shell 10 through the suction pipe (SP) is dispersed inside the shell 10, whereby the density per unit volume is lowered. Accordingly, the actual amount of refrigerant gas sucked into the compressing space during the reciprocating movement of the piston 31 is low, whereby the efficiency of the compressor is lowered. Also, the refrigerant gas sucked into the shell 10 is pre-heated by contacting to the reciprocating motor 20 inside the shell 10, and then the gas is sucked into the compressing space. Therefore, the specific volume of the refrigerant gas is increased, and the performance of the compressor is lowered. Also, when the suction valve 33 is opened/closed, the suction valve 33 is impacted to the front end surface of the piston 31, whereby the impact noise generated thereof is transferred to inside of the shell 10 entirely, and the noise of the entire compressor is increased. In addition, when the suction valve 33 is opened/closed, the counter-flowing refrigerant gas is impacted with the sucked refrigerant gas 5 instantaneously, whereby a pressure pulsation is generated. And the pressure pulsation is transferred to the suction pipe (SP) through the inner flowing passage 31a of the piston 31, and thereby the suction of the refrigerant gas is disturbed and the efficiency of the compressor is lowered. DISCLOSURE OF THE INVENTION Therefore, to solve the problems of the conventional art, it is an object of the present invention to provide a suction gas guide system for a reciprocating compressor which increase efficiency of the compressor by introducing sucked gas inside a shell to a compressing space, and thereby increasing a density of the refrigerant gas per unit volume. Also it is an another object of the present invention to provide a suction gas guide system for a reciprocating compressor which is able to increase the efficiency of the compressor by preventing the sucked gas from being pre-heated before introduced into the compressing space and thereby preventing the increase of a specific volume of the gas. In addition, it is still another object of the present invention to provide a suction gas guide system for a reciprocating compressor which is able to reduce the noise of the compressor by attenuating an impact noise generated from impact of the suction valve to a front end surface of the piston when the refrigerant gas is sucked. Also it is still another object of the present invention to provide a suction gas guide system for a reciprocating compressor which is able to suck the 6 refrigerant gas smoothly by attenuating a pressure pulsation generated from opening/closing of the suction valve. To achieve these objects of the present invention, there is provided a reciprocating compressor comprising : a shell to which a suction pipe and a discharge conduit are connected ; a reciprocating motor comprising a stator having an inner stator and an outer stator installed inside the shell with a predetermined air gap, and an armature disposed in the air gap between the two stators for reciprocating movement ; a compressor unit comprising a piston coupled to the armature of the reciprocating motor for reciprocating movement together with the armature, and having an inner flowing passage extending into the piston, and a cylinder supported inside of the reciprocating motor so that the piston is inserted into the cylinder slidably ; a frame unit supporting the reciprocating motor and the compressor unit ; and a spring unit elastically supporting the armature of the reciprocating motor toward motion direction ; characterised by a suction gas guide system comprising a gas guide conduit having both ends located inside the suction pipe and inside the inner flowing passage of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure 1 is a transverse cross-sectional view showing a conventional reciprocating compressor; 7 Figure 2 is a transverse cross-sectionaf view showing a reciprocating compressor according to the present invention; Figure 3 is a transverse cross-sectional view showing the reciprocating compressor centering around a suction gas guide system according to the present invention; Figure 4 is an exploded perspective view showing the suction gas guide system of the reciprocating compressor according to the present invention; Figure 5 is a transverse cross-sectional view showing an operating state of the reciprocating compressor according to the present invention; Figure 6 is a transverse cross-sectionai view showing an operating state of the reciprocating compressor according to the present invention; Figure 7 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention; Figure 8 is a transverse cross-sectionai view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention; Figure 9 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention; Figure 10 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention; and 8 Figure 11 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention. MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS Hereinafter, the suction gas guide system of the reciprocating compressor according to the present invention will be described with reference to the accompanying drawings. As shown in Figure 2, the reciprocating compressor including the suction gas guide system according to the present invention comprises a shell 10 in which a suction pipe (SP) and a discharge conduit (DP) are communicated; a reciprocating motor 20 fixed inside the shell; a compressing unit 30 installed inside the reciprocating motor, sucking, compressing and discharging a gas; a frame unit 40 supporting the reciprocating motor 20 and the compressor unit 30; a spring unit 50 elastically supporting an armature 22 of the reciprocating motor 20 in a motion direction and guiding a resonance; and gas guide unit 100 installed between the compressing unit 30 and the frame unit 40, and guiding the sucked gas. The reciprocating motor 20 includes a stator 21 comprising an inner stator 21A and an outer stator 21B, and an armature 22 disposed in an air gap generated between the inner stator 21A and the outer stator 21B and undergoing a reciprocating movement. The compressor unit 30 includes a piston 31 coupled to the magnet supporting member 22A of the reciprocating motor 20, and undergoing 9 reciprocating movement together; a cylinder 32 fixed to a front frame 41, which will be described later, so that the piston inserted into the cylinder slidably, and forming a compressing space with the piston; a suction valve 33 installed on the front end of the piston 31 and restricting suction of the gas by opening/ciosing a gas passing hole 31b of the piston 31, which will be described later; and a discharge valve assembly 34 installed on front end surface of the cylinder 32, covering the compressing space, and restricting discharge of the compressed gas. An inner flowing passage 31a communicated with the suction pipe (SP) is formed to have a certain depth inside the piston 31, and a gas passing hole 31b communicating with the inner flowing passage 31a and penetrated to the front end surface of the piston is formed inside the piston 31. The frame unit 40 includes a front frame 41 contacting to front surfaces of the inner stator 21A and of the outer stator 21B, whereby supporting the two stators together, and having a cylinder inserted and coupled to the front frame 41; a middle frame 42 contacting to the rear surface of the outer stator 21B and supporting the outer stator 21B; a rear frame 43 coupled to the middle frame 42 and supporting a rear end of a rear spring which will be described later. The spring unit 50 includes a front spring 51 having both ends supported by a front surface of the coupled part of a magnet supporting member 22A and of the piston 31, and by an inner surface of the front frame 41, respectively; and a rear spring 52 having both ends supported by a rear surface of the coupled part of the magnet supporting member 22A and of the piston 31, and by a corresponding front surface of the rear frame 43, respectively. 10 The gas guide unit 100 may include a guide conduit, or may include two or more guide conduits. Herein, a gas guide unit including two guide conduits will be described. As shown in Figures 3 and 4, the gas guide unit 100 includes a first guide conduit 110 coupled to the piston 31 so as to be inserted into the inner flowing passage 31a of the piston 31; and a second guide conduit 120 inserted inside the first guide conduit 110 so that a front side of the second guide conduit 120 is overlapped at a certain range and coupled on a same axial line with the first guide conduit. The first guide conduit 110 is fixedly screwed using a volt (not shown) on a flange unit 31c formed on rear end of the piston 31 so as to be coupled to the magnet supporting member 22A, and the second guide conduit 120 is fixedly screwed using a volt (not shown) on an inner surface of the rear frame 43 of the frame unit 40. An outer diameter of the first guide conduit 110 is formed shorter than an inner diameter of the inner flowing passage 31a of the piston, so that a first resonant space (S1) between the outer surface of the first guide conduit 110 and the corresponding inner surface of the piston 31. In addition, the rear end of the first guide conduit 110 abuts to the flange unit 31c formed on the rear end of the piston 31, but the front end of the first guide conduit 110 communicates with the inner flowing passage 31a because the length of the first guide conduit 110 is shorter than that of the entire inner flowing passage 31a formed inside the piston 31. 11 Also, on the front end of the first guide conduit 110, an outward flange unit 111 toward the inner circumferential wall of the inner flowing passage 31a so that the entrance of the first resonant space (S1) is stepped. On the other hand, the second guide conduit 120 includes a large conduit unit 121 fixed to the rear frame 43, and a small conduit unit 122 coupled to the front side of the large conduit unit 121 and inserted into the first guide conduit 110. The large conduit unit 121 includes a baffle unit 121A dividing the inside of the large conduit unit 121 into a plurality of resonant spaces (S2 and S3) is installed at least one (a baffle unit is shown in Figure), and it is desirable that the baffle unit 121A is installed in a vertical direction against the flowing direction of the gas. Also, the large conduit unit 121 includes the baffle unit 121A; a first conduit unit 121B and a second conduit unit 121C-forming a body with the baffle unit 121A and forming a second resonant space (S2) and a third resonant space (S3) by coupling both sides of the baffle unit 121A; and a first side plate unit 121D and a second side plate unit 121E coupling to the other sides of the first and second conduit unit 121B and 121C, respectively. Outer diameters of the first conduit unit 121B and the second conduit unit 121C are formed same as those of the baffle unit 121A and the respective side plate units 121D and 121E, and bores 121a, 121d, and 121e are formed in a central part of the baffle unit 121A and of the respective side plate units 121D and 121E at the same axial line with those of the suction pipe (SP), the small conduit unit 122, and the inner flowing passage 31a. 12 The first side plate unit 121D is located on front side of the large conduit unit 121, in which the small conduit unit 122 is coupled on its bore 121d, and a flange unit (not defined as a reference numeral) coupled to the rear frame 43 is formed on the second side plate unit 121E. Also, it is desirable that an inner edge of the entrance of the small conduit unit 122 is formed round. In addition, the first conduit unit 121B and the first side plate 121D may be formed as a single body, and the other members are able to be welded by an ultrasonic welding or a brazing method. Same components as those of the conventional art are designated by the same reference numerals. Reference numeral 22B designates a magnet. The suction gas guide system of a reciprocating compressor according to the present invention has effects as follows. That is, when an electric source is applied to the reciprocating motor 20, accordingly a flux is formed between the inner stator 21A and the outer stator 21B, whereby the armature 22 with the piston 31 moves in accordance with the direction of the flux and undergoes linear reciprocating movement by the spring unit 50. Then, the piston 31 coupled to the armature 22 undergoes the linear reciprocating movement inside the cylinder 32 so that a pressure variance is repeatedly generated inside the cylinder 32. Accordingly, due to the pressure variance inside the cylinder 32, the refrigerant gas is sucked into the compressing space of the cylinder 32 through the inner flowing passage 31a in the piston 31, then compressed and discharged. And this process is repeated. 13 Hereinafter, the process will be described in more detail. First, as shown in Figure 5, the refrigerant gas (indicated as the real line arrow in drawing) is sucked and charged inside the shell 10 through the suction pipe (SP) during the suction stroke of the piston 31, and after that, the refirgerant gas charged in the shell 10 is sucked into the compressing space of the cylinder 32 as opening the suction valve 33 through the large conduit unit 121 and the small conduit unit 122 of the second guide conduit 120, the first guide conduit 110, and the gas passing hole 31b on the inner flowing passage 31a of the piston 31 during the continued suction stroke of the piston 31. At that time, before the refrigerant gas sucked into the shell 10 is dispersed entire shelf 10, the gas is guided to the inner flowing passage 31a of the piston through the respective guide conduits 110 and 120, and the refrigerant gas guided into the inner flowing passage 31a is directly sucked into the compressing space as opening the suction valve 33 through the gas passing 31b, whereby the density of the gas per unit volume is increased, and therefore the efficiency of the compressor is able to be increased. Also, as the refrigerant gas sucked into the shell 10 through the suction pipe (SP) is guided to the compressing space of the cylinder 43 through the gas guide unit 100, a direct contact of the gas to the motor can be prevented to a certain extent. And thereby increase of the specific volume of the refrigerant gas is able to be restrained, and accordingly, the amount of sucked gas is increased, whereby the efficiency of the compressor can be increased. Also, the first guide conduit 110 and the second guide conduit 120 of the 14 gas guide unit 100 are disposed to be overlapped always when the piston 31 undergoes the reciprocating movement, and therefore the leakage of the refrigerant gas during the suction of the gas is able to be reduced. Accordingly, the suction rate of the refrigerant gas is increased, whereby the efficiency of the compressor also is able to be increased. Also, the suction pipe (SP), the first guide conduit 110 and the second guide conduit 120 are disposed at the same axial line, especially, even though the large conduit unit 121 is located on the sucking side of the second guide conduit 120, the connecting part of the large conduit unit 121 and the small conduit unit 122 is formed as round, whereby the refrigerant gas is directly sucked into the compressing space of the cylinder 32 through the suction pipe (SP). Therefore, the suction rate of the refrigerant gas is increased, and the efficiency of the compressor can be increased. After that, as shown in Figure 6, the refrigerant gas in the compressing space of the cylinder 32 is compressed during the compressing stroke of the piston 31, and then the gas is discharged by opening the discharge valve 34. At that time, the suction valve 33 opened during the suction of the refrigerant gas is closed, and then the suction valve 33 is impacted to the front surface of the piston 31, whereby an impact noise (indicated as dotted line arrows in the drawing) between the valve 33 and the piston 31 is generated. And the noise travels in a direction opposite to the suction direction of the gas, but the noise of low frequency is attenuated in the first resonant space (S1) formed between the inner flowing passage 31a of the piston and the first guide conduit 110, and the noise 15 of high frequency is attenuated through the second resonant space (S2) and the third resonant space (S3) formed on the large conduit unit 121 in the second guide conduit 120, whereby the reliability of the compressor is increased. Also, as the suction valve 33 is opened/closed, some of the refrigerant gas being sucked is counter flown, and accordingly the counter-flowing refrigerant gas causes a pressure pulsation by impact with the refrigerant gas being sucked through the inner flowing passage 31a of the piston 31. Then, the pressure pulsation disturbs the suction of the refrigerant gas by flowing to the opposite of the suction direction. However, the pressure pulsation is somewhat attenuated with the impact noise while flowing through the respective resonant space (S1, S2, and S3), whereby the amount of the refrigerant gas newly sucked is able to be increased, and the efficiency of the compressor can be increased. In addition, the large conduit unit 121 is fixed on the rear frame 43 and does not move with the reciprocating movement of the piston 31, and therefore the flow resistance is restrained and the efficiency of the compressor is able to be increased. Moreover, when the gas guide unit 100 is assembled, the large conduit unit 121 is molded as separated members and fabricated by the ultrasonic welding or by the brazing, and after that the large conduit unit 121 is assembled. Therefore the assembling process of the gas guide unit 100 is made in simple way, whereby the productivity can be increased. Hereinafter, the another embodiment of the suction gas guide system for a reciprocating motor according to the present invention will be described. 16 In the embodiment described above, the first guide conduit 110 and the second guide conduit 120 are fixed on the piston 31 and on the frame 43 respectively as separate bodies. However, in the present embodiment, as shown in Figure 7, a first guide conduit 210 and a second guide conduit 220 may be fixed on the piston 31 together, or as shown in Figure 8, a first guide conduit 310 and a second guide conduit 320 may be fixed on the frame 43 together. As for the embodiment shown in Figure 7, in case that the first guide conduit 210 and the second guide conduit 220 are fixed on the piston 31, the first guide conduit 210 is formed extending forward so as to be inserted in the inner flowing passage 31a, and the second guide conduit 220 is formed extending backward so as to oppose against the suction pipe (SP) of the shell 10 and to be overlapped with the bore 43a included in the frame 43 in a certain range. Also, the first guide conduit 210 is formed to have an outer diameter shorter than the inner diameter of the piston 31 so that the outer surface of the first guide conduit 210 and the inner surface of the piston 31 form the first resonant space (S1), and an outward flange unit 211 is formed on front end of the first guide conduit 210. On the contrary, the said large conduit unit 221 is formed on the coupled part with the piston 31 of the second guide conduit 220, and the said baffle unit 221A is formed on the large conduit unit 221. As described in the above embodiment, the large conduit unit 221 includes the baffle unit 221A; a first conduit unit 221B and a second conduit unit 221C coupled on both sides of the baffle unit 221A whereby forming the second resonant space (S2) and the third 17 resonant space (S3); and a first side plate unit 221D and a second side plate unit 221E coupled to the other sides of the first conduit unit 221B and the second conduit unit 221C. Herein, it is desirable that the inner edge of the first guide conduit 210 entrance is formed roundly. In addition, in the large conduit unit 221 in the second guide conduit 220, the second conduit unit 221C and the second side plate unit 221E may be formed as a single body, and rest components can be able to be coupled by using ultrasonic welding or brazing. As described above, in case that the first and second guide conduit 210 and 220 are all coupled to the piston 31, the first and second guide conduit 210 and 220 undergo the reciprocating movement along with that of the piston 31, whereby the conduits 210 and 220 guide the refrigerant gas sucked into the shell 10 to the compressing space of the cylinder 32. At this time, as the first and second guide conduit 21 and 220 are coupled together to the piston 31, the leakage of the refrigerant gas between the conduits 210 and 220 is prevented, and therefore the amount of sucked gas can be increased. And the respective effects described in the above embodiment are similar with those of the present embodiment, and accordingly, the description for that is omitted. As shown in Figure 8, in case that the first guide conduit 310 and the second guide conduit 320 are all fixed on the frame 43, the large conduit unit 321 including the baffle unit 321A is formed on the first guide conduit 310, and a extended unit 331 may be formed on the second guide conduit 320 so as to be 18 inserted in the bore 43a of the rear frame 43. The first guide conduit 310 includes a large conduit unit 321 fixed on inner surface of the rear frame 43, and a small conduit unit 322 coupled to front side of the large conduit unit 321 and inserted into the inner flowing passage 31a. Also, it is desirable that the first guide conduit 310 is always located inside the range of the inner flowing passage 31a when the piston 31 undergoes reciprocating movement, and the distance (a) from the end of the inner flowing passage 31a of the piston 31 to the front end of the small conduit unit 312 is shorter than the distance (b) between the rear side surface of the inner stator 21A and the inner surface of the magnet supporting member 22A because the first guide conduit 310 is fixed on the frame 43 apart from the piston 31. The large conduit unit 321 includes the baffle unit 321A; a first conduit unit 321B and a second conduit unit 321C forming a body unit with the baffle unit 321A and coupled to both sides of the baffle unit.321A whereby forming the second resonant space (S2) and the third resonant space (S3); and a first side plate unit 321D and a second side plate unit 321E coupled to the other sides of the first and second conduit units 321B and 321C, respectively. The first side plate unit 321D is located on front side of the large conduit unit 321 having a small conduit unit 322 coupled to its bore (not defined). And a flange unit (not defined) coupled to the rear frame 43 is formed on the second side plate unit 321E. Also, the first conduit unit 321B and the first side plate unit 321D may be formed as a single body, and rest members may be welded and coupled by using 19 ultrasonic welding or brazing method. It is desirable that an inner edge of the entrance end of the small conduit unit 322 is formed roundly. On the other hand, an extended unit 321 penetrating the rear frame 43 as described above is formed extending from the flange unit (not defined) fixed on the rear frame 43 in the second guide conduit 320. In that case, the first and second guide conduits 310 and 320 are all fixed on the frame, that is, a fixed body, accordingly, the weight of the piston 31 as an armature is reduced, whereby the efficiency of the motor is increased, moreover, a flow resistance is reduced. The present embodiment has similar structure and effects as those of the embodiments described above, and the descriptions for that will be omitted. Hereinafter, the another embodiment of the present invention will be described. The gas guide unit in the embodiments described above includes the first guide conduit and the second guide conduit, however, in the present embodiment, the gas guide unit further includes an intermediate guide conduit between the first and second guide conduits. As shown in Figure 9, the intermediate guide conduit 430 is installed on rear side of the first guide conduit 410 fixed on the piston 31, and the second guide conduit 420 inserted into the intermediate guide conduit 430 slidabiy is fixedly coupled to the frame43. The first guide conduit 410 is formed extending from the rear side of the piston 31 toward the frame 43, and a diameter of the first guide conduit 410 is 20 formed larger than that of the inner flowing passage 31a of the piston 31 so as to perform as the large conduit unit 411. A baffle unit 411A dividing inside of the first guide conduit 410 into a plurality of resonant spaces (S2 and S3) is located in intermediate part of the first guide conduit 410. In addition, the first conduit unit 411B and the second conduit unit 411C are installed on both sides of the baffle unit 411 A, the first side plate unit 411D is installed on front surface of the first conduit unit 411B, and a connecting plate unit 411E forming the second side plate unit and connectively supporting the intermediate guide conduit 430 is installed on rear surface of the second conduit unit 41C. It is desirable that the intermediate guide conduit 430 is installed at same axial line of the suction pipe (SP), the second guide conduit 420, and the inner flowing passage 31a of the piston 31. Also, it is desirable that the inner diameter of the intermediate guide conduit 430 is formed larger than the outer diameter of the second guide conduit 420 so that the second guide conduit 420 is inserted into the intermediate guide conduit 430 slidably. The rear end of the second guide conduit 420 is fixed on inner surface of the frame 43 and extended toward the piston 31, and the front end of the second guide conduit 420 is inserted so as to be overlapped with the middle guide conduit 430 always. The effects of the present embodiment are similar with those of the embodiments described above, and therefore detailed descriptions for that are 21 omitted. On the other hand, the gas guide unit may include a plurality of large conduit unit as shown in Figures 10 and 11. That is, the embodiment shown in Figure 10 includes a second large conduit unit 421 formed on one side of the second guide conduit 420 in the embodiment shown in Figure 9. In that case, the second large conduit unit 421 is assembled in same way as that of the large conduit unit 411 of the first guide conduit 410, that is, the baffle unit 421A, the first conduit unit 421B, the second conduit unit 421C, the first side plate unit 421D, and the second side plate unit 421E are coupled by assembling them after separately molded. Herein, the second guide conduit 420 includes the second large conduit unit 421 and a second small conduit unit 422 as described above, and the first conduit unit 421B and the first side plate unit 421D of the second large conduit unit 421 are formed as a single body, if necessary, and the other components may be coupled by using the ultrasonic welding or brazing. Also, it is desirable that the inner edge of the entrance of the second small conduit unit 422 is formed roundly. On the other hand, as shown in Figure 11, the first guide conduit 410 may include a first small conduit unit 412 inserted inside of the piston 31 on the front side. in that case, it is desirable that the outer diameter of the first small conduit unit 412 is formed shorter than the inner diameter of the inner flowing passage 31a so that the above-described resonant space (S1) is able to be located between the outer circumference of the first small diameter unit 412 and the inner 22 flowing passage 31a of the piston 31. Also, it is desirable that an outward flange unit 412a is formed on end of the first small conduit unit 412 so that the efficiency of the resonant space (S1) can be increased. Also, the middle guide conduit 430 and the second guide conduit 420 may be disposed conversely. As described above, in case of the embodiments shown in Figures 10 and 11, the first large conduit unit 410 and the second large conduit unit 421 attenuate the noise, whereby the noise is reduced more efficiently. In particular, as shown in Figure 11, the small conduit unit 412 is inserted into the inner flowing passage 31a of the piston 31, whereby forming the resonant space (S1) with the piston 31. Therefore the noise of low frequency is able to be reduced in the resonant space (S1), whereby the efficiency of reducing noise can be increased more. In addition to the effect described above, the present embodiment has same structure and effects as those of the embodiments described earlier, and the detailed descriptions for that are omitted. INDUSTRIAL APPLICABILITY As described above, in the suction gas guide system for the reciprocating compressor according to the present invention, the gas guide conduit having both ends installed on the suction pipe of the shell and on the inner flowing passage of the piston facing each other and having the resonant space, is installed on same axial line so that the sucked gas inside the shell through the suction pipe 23 - is guided to the inner flowing passage of the piston disposed on inner side of the motor, whereby the refrigerant gas is sucked smoothly into the inner flowing passage through the gas guide conduit, and therefore the suction rate of the refrigerant gas is increased. In addition, the noise and vibration generated during suction of the refrigerant gas is attenuated in the resonant space, and therefore the flow resistance against the sucked gas is reduced, whereby the efficiency and the reliability of the compressor is increased. Also, the pre-heating of the refrigerant gas being sucked into the shell by the motor is prevented, and the specific volume of the refrigerant gas is not increased, whereby the efficiency of the compressor is able to be increased. Also, the gas guide conduit is assembled after the components are molded, and therefore the assembling process of the gas guide conduit is easy to be performed, whereby the productivity is able to be increased. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalence of such meets and bounds are therefore intended to be embraced by the appended claims. 24 CLAIMS :o 1. A reciprocating compressor comprising : a shell to which a suction pipe and a discharge conduit are connected ; a reciprocating motor comprising a stator having an inner stator and an outer stator installed inside the shell with a predetermined air gap, and an armature disposed in the air gap between the two stators for reciprocating movement; a compressor unit comprising a piston coupled to the armature of the reciprocating motor for reciprocating movement together with the armature, and having an inner flowing passage extending into the piston, and a cylinder supported inside of the reciprocating motor so that the piston is inserted into the cylinder slidably; a frame unit supporting the reciprocating motor and the compressor unit ; and a spring unit elastically supporting the armature of the reciprocating motor toward motion direction ; characterised by a suction gas guide system comprising a gas guide conduit having both ends located inside the suction pipe and inside the inner flowing passage of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston. 2. The compressor as claimed in claim 1, wherein the gas guide conduit is located at the same axial line as that of the suction pipe of the shell. 25 3. The compressor as claimed in claim 1, wherein the gas guide conduit is formed to be inserted into the inner flowing passage of the piston partially or entirely. 4. The compressor as claimed in claim 1, wherein a flange unit flanged toward inner surface of the inner flowing passage in the piston is formed on end of the gas guide conduit. 5. The compressor as claimed in claim 1, wherein the gas guide conduit comprises a first guide conduit extended toward inside of the inner flowing passage of the piston, and a second guide conduit extended toward the frame located between the piston and the suction pipe so as to communicate with the first guide conduit. 6. The compressor as claimed in claim 5, wherein a large conduit unit, in which the diameter is enlarged, is provided at least on one of the first and second guide conduits. 7. The compressor as claimed in claim 5, wherein one of the first and second guide conduits is inserted into the other conduit so as to be overlapped in a predetermined range. 26 8. The compressor as claimed in claim 5, wherein the first guide conduit is fixed on the piston, the second guide conduit is fixed on the frame located between the piston and the suction pipe, and one of the first and second guide conduits is inserted into the other conduit so as to be overlapped with the other conduit in a predetermined range. 9. The compressor as claimed in claim 7 or claim 8, wherein the first guide conduit is formed to be inserted into the second guide conduit. 10. The compressor as claimed in claim 5, wherein the first guide conduit and the second guide conduit are fixed on the piston, and the second guide conduit extends toward the suction pipe of the frame. 11. The compressor as claimed in claim 10, wherein a bore, through which the second guide conduit passes, is formed on the frame disposed between the piston and the suction pipe, an extended conduit extending toward the axial direction of the second guide conduit is provided on outer circumference of the bore, and the second guide conduit is inserted and overlapped with the extended conduit. 12. The compressor as claimed in claim 5, wherein the first guide conduit and the second guide conduit are fixed on the frame disposed between the piston and the suction pipe, and the distance from the end of the first guide conduit 27 extending toward the inner flowing passage of the piston to the inner end of the inner flowing passage of the piston is longer than half of distance of the reciprocating movement of the piston. 13. The compressor as claimed in claim 5, wherein the first guide conduit or the second guide conduit has a baffle unit, in which a bore of a predetermined size is formed. 14. The compressor as claimed in claim 6, wherein a baffle unit having a bore of a predetermined size is formed inside the large conduit unit. 15. The compressor as claimed in claim 7, wherein one of the first and second guide conduits comprises a middle guide conduit which is adjacent to outer circumference of the guide conduit inserted inside and has a predetermined length toward the central line of the inserted guide conduit. 16. The compressor as claimed in claim 15, wherein the middle guide conduit is coupled to the guide conduit which is located outer side between the first or second guide conduit, and is overlapped in a predetermined range with the inner guide conduit. 28 17. The compressor as claimed in claim 1, wherein the gas guide conduit comprises a first guide conduit communicated to the inner flowing passage of the piston, a second guide conduit communicated to the bore formed on the frame between the piston and the suction pipe, and the middle conduit more than one disposed between the first and second guide conduits. 18. The compressor as claimed in claim 17, wherein a large conduit unit which has enlarged inner diameter comprises at least one of said first guide conduit, the second guide conduit, and the middle guide conduit. 19. The compressor as claimed in claim 17, wherein at least one of said first and second guide conduits is formed to have a larger inner diameter than the other guide conduit. 20. The compressor as claimed in claim 17, wherein one of said first, second, and middle guide conduits is disposed to be inserted into the other guide conduit. 21. The compressor as claimed in claim 17, wherein the first guide conduit and the second guide conduit are disposed to be overlapped in a predetermined range when the piston undergoes reciprocating movement. 29 22. The compressor as claimed in claim 17, wherein a baffle unit having a bore of a predetermined size is provided inside one of the first, second, and middle guide conduits. 23. The compressor as claimed in claim 17, wherein the large conduit unit which has enlarged inner diameter is formed on one of said first, second and middle guide conduits, and the baffle unit having a bore is formed inside the large conduit unit. 24. The compressor as claimed in claim 14, wherein the baffle unit is formed on one of said first and second guide conduits, which has larger inner diameter than that of the other guide conduit respectively. 25. The compressor as claimed in claim 17, wherein the middle guide conduit is adjacent to outer surface of the guide unit which is inserted inside between said first or second guide conduit, and is formed to have a predetermined length toward the central line of the inserted guide conduit. 26. The compressor as claimed in claim 25, wherein the middle guide conduit is coupled to the guide conduit located outside between the first or second guide conduit so that the middle guide conduit is overlapped with the inside guide conduit in a predetermined range. 30 27. The compressor as claimed in claim 17, wherein one of said first, second, and middle guide conduits is inserted to inside of the other guide conduit, whereby an overlapped portion of the two guide conduits is formed, and the guide conduit which is inserted to inside the other conduit is disposed to pass the bore of the baffle unit in accordance with the reciprocating movement of the piston. 28. The compressor as claimed in claim 1, wherein a plurality of conduits are disposed to be communicated organically with each other in the gas guide conduit. 29. A reciprocating compressor as claimed in claim 1, wherein the gas guide conduit comprises a first guide conduit communicated to the inner flowing passage of the piston, and a second guide conduit communicated to a bore of the frame disposed between the inner flowing passage of the piston and the suction pipe. 30. The compressor as claimed in claim 29, wherein at least one of the first and second guide conduits comprises a large conduit unit having larger inner diameter than that of the other. 31 31. The compressor as claimed in claim 30, wherein a part or entire second guide conduit is inserted inside the first guide conduit and is overlapped with the first guide conduit. 32. The compressor as claimed in claim 30, wherein the first guide conduit comprises a large conduit unit and a connecting plate unit which is connected to the large conduit unit vertically and has a bore of a predetermined size, and the second guide conduit is disposed to pass through the bore in the connecting plate unit and to be inserted inside the large conduit unit of the first guide conduit. 33. The compressor as claimed in claim 32, wherein a middle guide conduit having a predetermined length toward the central line of the first guide conduit is provided on the outer circumference of the bore in the connecting plate unit, and the second is disposed to be adjacent to the inner side of the middle guide conduit so as to be overlapped with the middle guide conduit. 34. The compressor as claimed in claim 30, wherein a baffle unit having a bore of a predetermined size is provided inside the large conduit unit. 35. The compressor as claimed in claim 34, wherein the bore in the baffle unit has a diameter same as outer diameter of the second guide conduit. 32 36. The compressor as claimed in claim 30, wherein the inner diameter of the large conduit unit is larger than that of the inner flowing passage of the piston. 37. The compressor as claimed in any one of claims 6, 8, 10, 12 and 27, wherein a flange unit for supporting the spring unit is formed on one of the first guide conduit and the second guide conduit. 38. The compressor as claimed in claim 27, wherein the second guide conduit has a rounded part which has a rounded surface from the suction pipe to the piston. 39. The compressor as claimed in claim 29, wherein the first guide conduit is inserted into the second guide conduit. 40. The compressor as claimed in any one of claims 1, 2, 17 and 29, wherein a flange unit is formed on those guide conduits, coupled to the frame between the piston and the suction pipe or to the piston, and the other guide conduits are fixed centering around the guide conduit fixed on the frame or on the piston. 41. The compressor as claimed in any one of claims 6, 14, 29, 32, 34 and 36, wherein the large conduit unit comprises a cylindrical conduit unit ; and a first side plate unit and a second side plate unit which are connected to both ends of 33 the outer circumference of the conduit unit and have bores with smaller inner diameter than that of the conduit unit; and one of the first and second side plate units is molded with the conduit unit as a single body. 42. The compressor as claimed in claim 41, wherein one of the first and second side plate units is coupled to the conduit unit by using ultrasonic welding or brazing method. 43. The compressor as claimed in any one of claims 6, 14, 29, 32, 34 and 36, wherein the large conduit unit is fixed on the frame facing the suction pipe of the shell. 44. The compressor as claimed in any one of claims 1, 2, 4, 5, 8, 9, 10, 12, 13, 15, 16, 17, 19, 25, 26, 27, 29, 33, 34, 35, 36, 38 and 42, wherein the guide conduits are disposed to be located on same axial line. A reciprocating compressor comprises : a shell (10) to which a suction pipe (SP) and a discharge conduit (DP) are connected ; a reciprocating motor (20) comprising a stator (21) having an inner and outer stators (21 A, 21B) installed inside the shell, and an armature (22) disposed in the air gap between the two stators ; a compressor unit (30) comprising a piston (31) coupled to the armature (22), and having an inner flowing passage (31A) extending into the piston, and a cylinder (32) supported inside of the motor (20) so that the piston is slidable into the cylinder (32); a frame unit (40) supporting the motor (20) and the compressor unit (30) and a spring unit (50) elastically supporting the armature (22) towards motion direction ; characterised by a suction gas guide system (100) comprising a gas guide conduit (110) having both ends located inside the suction pipe (SP) and in the inner flowing passage (31A) of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston.

Full Text

1
A RECIPROCATING COMPRESSOR TECHNICAL FIELD
The present invention relates to a reciprocating compressor, and particularly, to a suction gas guiding system for a reciprocating compressor which is suitable for introducing suction gas into a compressor unit smoothly, and for reducing suction noise in case of installing the compressor unit inside a reciprocating motor.
BACKGROUND ART
Generally, a reciprocating compressor can be divided into a compressor which compresses and discharges the sucked gas by changing a rotating movement of a driving motor into a reciprocating motion of a piston, and a compressor which compresses and discharges the sucked gas by making the piston undergo reciprocating movement while the driving motor undergoes linear reciprocating movement.
Figure 1 is a transverse cross-sectional view showing an embodiment of the reciprocating compressor in which the driving motor undergoes the linear reciprocating movement.
As shown therein, a conventional reciprocating compressor comprises a shell 10 in which a suction pipe (SP) and a discharge conduit (DP) are communicated with each other ; a reciprocating motor 20 fixed inside the shell 10; a compressor unit 30 installed inside the reciprocating motor 10, sucking,

2
compressing, and discharging gas; a frame unit 40 supporting the reciprocating motor 20 and the compressor unit 30; and a spring unit 50 elastically supporting an armature 22 of the reciprocating motor 20 in motion direction and guiding a resonance.
The reciprocating motor 20 includes a stator 21 including an inner stator 21A and an outer stator 21B, and an armature 22 disposed in a gap between the inner stator 21A and the outer stator 21B and undergoing a reciprocating movement.
The compressor unit 30 comprises a piston 31. coupled to a magnet supporting member 22A of the reciprocating motor 20 and undergoing the reciprocating movement together with the magnet supporting member 22A; a cylinder 32 fixed on a front frame 41 which will be described later and forming a compressing space with the piston; a suction vaive 33 installed on front end of the piston and restricting the suction of gas by opening/closing a gas passing hole 31b of the piston which will be described later; and a discharge valve assembly 34 disposed on the front end of the cylinder 32, whereby covering the compressing space, and restricting the discharge of compressed gas.
An inner flowing passage 31a communicating with the suction pipe (SP) is formed to a certain depth inside the piston 31, and the gas passing hole 31b communicated with the inner flowing passage 31a and penetrated to front end surface of the piston 31 is formed.
The frame unit 40 includes a front frame 41 contacting to front surfaces of the inner stator 21A and of the outer stator 21B, whereby supporting the stators

3
together, and in which the cylinder 32 is inserted; a middle frame 42 contacting to rear surface of the outer stator 21B, whereby supporting the outer stator 21B; and a rear frame 43 coupled to the middle frame 42 and supporting rear end of a rear spring 52 which will be described later.
The spring unit 50 includes front spring 51 having both ends supported by the front surface of coupled part of the magnet supporting member 22A and the piston 31 and by the corresponding inner surface of the front frame 41, and a rear spring 52 having both ends supported by rear surface of the coupled part of the magnet supporting member 22A and the piston 31, and by corresponding front surface of the rear frame 43.
Reference numeral 22B designates a magnet.
The conventional reciprocating compressor as described above is operated as follows.
That is, when an electric current is applied to the winding coil 21C installed on the outer stator 21B of the reciprocating motor 20 and a flux is generated between the inner stator 21A and the outer stator 21B, whereby the armature 22 located in the gap between the inner stator 21A and the outer stator 21B moves in accordance with the direction of the flux and undergoes reciprocating movement by the spring unit 50. And accordingly, the piston 22 coupled to the armature 22 undergoes reciprocating movement inside the cylinder 32, so that a volume variance is generated inside the compressing space, accordingly the refrigerant gas is sucked into the compressing space, then compressed and discharged.

4
The refrigerant gas is sucked inside the shell 10 through the suction pipe (SP) during the suction stroke of the piston, and the gas is sucked into the compressing space of the cylinder 32 as opening the suction valve 33 through the inner flowing passage 31a of the piston 31 and through the gas passing hole 31b. Then, the gas is compressed to a certain level during the compress stroke of the piston, and discharged through the discharge conduit 34 as opening the discharge valve assembly 34. And the whole process is repeated.
However, in the conventional reciprocating compressor as described above, the refrigerant gas sucked into the shell 10 through the suction pipe (SP) is dispersed inside the shell 10, whereby the density per unit volume is lowered. Accordingly, the actual amount of refrigerant gas sucked into the compressing space during the reciprocating movement of the piston 31 is low, whereby the efficiency of the compressor is lowered.
Also, the refrigerant gas sucked into the shell 10 is pre-heated by contacting to the reciprocating motor 20 inside the shell 10, and then the gas is sucked into the compressing space. Therefore, the specific volume of the refrigerant gas is increased, and the performance of the compressor is lowered.
Also, when the suction valve 33 is opened/closed, the suction valve 33 is impacted to the front end surface of the piston 31, whereby the impact noise generated thereof is transferred to inside of the shell 10 entirely, and the noise of the entire compressor is increased.
In addition, when the suction valve 33 is opened/closed, the counter-flowing refrigerant gas is impacted with the sucked refrigerant gas

5
instantaneously, whereby a pressure pulsation is generated. And the pressure pulsation is transferred to the suction pipe (SP) through the inner flowing passage 31a of the piston 31, and thereby the suction of the refrigerant gas is disturbed and the efficiency of the compressor is lowered.
DISCLOSURE OF THE INVENTION
Therefore, to solve the problems of the conventional art, it is an object of the present invention to provide a suction gas guide system for a reciprocating compressor which increase efficiency of the compressor by introducing sucked gas inside a shell to a compressing space, and thereby increasing a density of the refrigerant gas per unit volume.
Also it is an another object of the present invention to provide a suction gas guide system for a reciprocating compressor which is able to increase the efficiency of the compressor by preventing the sucked gas from being pre-heated before introduced into the compressing space and thereby preventing the increase of a specific volume of the gas.
In addition, it is still another object of the present invention to provide a suction gas guide system for a reciprocating compressor which is able to reduce the noise of the compressor by attenuating an impact noise generated from impact of the suction valve to a front end surface of the piston when the refrigerant gas is sucked.
Also it is still another object of the present invention to provide a suction gas guide system for a reciprocating compressor which is able to suck the

6
refrigerant gas smoothly by attenuating a pressure pulsation generated from opening/closing of the suction valve.
To achieve these objects of the present invention, there is provided a reciprocating compressor comprising : a shell to which a suction pipe and a discharge conduit are connected ; a reciprocating motor comprising a stator having an inner stator and an outer stator installed inside the shell with a predetermined air gap, and an armature disposed in the air gap between the two stators for reciprocating movement ; a compressor unit comprising a piston coupled to the armature of the reciprocating motor for reciprocating movement together with the armature, and having an inner flowing passage extending into the piston, and a cylinder supported inside of the reciprocating motor so that the piston is inserted into the cylinder slidably ; a frame unit supporting the reciprocating motor and the compressor unit ; and a spring unit elastically supporting the armature of the reciprocating motor toward motion direction ;
characterised by a suction gas guide system comprising a gas guide conduit having both ends located inside the suction pipe and inside the inner flowing passage of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 is a transverse cross-sectional view showing a conventional reciprocating compressor;

7
Figure 2 is a transverse cross-sectionaf view showing a reciprocating compressor according to the present invention;
Figure 3 is a transverse cross-sectional view showing the reciprocating compressor centering around a suction gas guide system according to the present invention;
Figure 4 is an exploded perspective view showing the suction gas guide system of the reciprocating compressor according to the present invention;
Figure 5 is a transverse cross-sectional view showing an operating state of the reciprocating compressor according to the present invention;
Figure 6 is a transverse cross-sectionai view showing an operating state of the reciprocating compressor according to the present invention;
Figure 7 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention;
Figure 8 is a transverse cross-sectionai view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention;
Figure 9 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention;

Figure 10 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention; and

8
Figure 11 is a transverse cross-sectional view showing an another embodiment of the suction gas guide system of the reciprocating compressor according to the present invention.
MODES FOR CARRYING OUT THE PREFERRED EMBODIMENTS
Hereinafter, the suction gas guide system of the reciprocating compressor according to the present invention will be described with reference to the accompanying drawings.
As shown in Figure 2, the reciprocating compressor including the suction gas guide system according to the present invention comprises a shell 10 in which a suction pipe (SP) and a discharge conduit (DP) are communicated; a reciprocating motor 20 fixed inside the shell; a compressing unit 30 installed inside the reciprocating motor, sucking, compressing and discharging a gas; a frame unit 40 supporting the reciprocating motor 20 and the compressor unit 30; a spring unit 50 elastically supporting an armature 22 of the reciprocating motor 20 in a motion direction and guiding a resonance; and gas guide unit 100 installed between the compressing unit 30 and the frame unit 40, and guiding the sucked gas.
The reciprocating motor 20 includes a stator 21 comprising an inner stator 21A and an outer stator 21B, and an armature 22 disposed in an air gap generated between the inner stator 21A and the outer stator 21B and undergoing a reciprocating movement.
The compressor unit 30 includes a piston 31 coupled to the magnet supporting member 22A of the reciprocating motor 20, and undergoing

9
reciprocating movement together; a cylinder 32 fixed to a front frame 41, which will be described later, so that the piston inserted into the cylinder slidably, and forming a compressing space with the piston; a suction valve 33 installed on the front end of the piston 31 and restricting suction of the gas by opening/ciosing a gas passing hole 31b of the piston 31, which will be described later; and a discharge valve assembly 34 installed on front end surface of the cylinder 32, covering the compressing space, and restricting discharge of the compressed gas.
An inner flowing passage 31a communicated with the suction pipe (SP) is formed to have a certain depth inside the piston 31, and a gas passing hole 31b communicating with the inner flowing passage 31a and penetrated to the front end surface of the piston is formed inside the piston 31.
The frame unit 40 includes a front frame 41 contacting to front surfaces of the inner stator 21A and of the outer stator 21B, whereby supporting the two stators together, and having a cylinder inserted and coupled to the front frame 41; a middle frame 42 contacting to the rear surface of the outer stator 21B and supporting the outer stator 21B; a rear frame 43 coupled to the middle frame 42 and supporting a rear end of a rear spring which will be described later.
The spring unit 50 includes a front spring 51 having both ends supported by a front surface of the coupled part of a magnet supporting member 22A and of the piston 31, and by an inner surface of the front frame 41, respectively; and a rear spring 52 having both ends supported by a rear surface of the coupled part of the magnet supporting member 22A and of the piston 31, and by a corresponding front surface of the rear frame 43, respectively.

10
The gas guide unit 100 may include a guide conduit, or may include two or more guide conduits. Herein, a gas guide unit including two guide conduits will be described.
As shown in Figures 3 and 4, the gas guide unit 100 includes a first guide conduit 110 coupled to the piston 31 so as to be inserted into the inner flowing passage 31a of the piston 31; and a second guide conduit 120 inserted inside the first guide conduit 110 so that a front side of the second guide conduit 120 is overlapped at a certain range and coupled on a same axial line with the first guide conduit.
The first guide conduit 110 is fixedly screwed using a volt (not shown) on a flange unit 31c formed on rear end of the piston 31 so as to be coupled to the magnet supporting member 22A, and the second guide conduit 120 is fixedly screwed using a volt (not shown) on an inner surface of the rear frame 43 of the frame unit 40.
An outer diameter of the first guide conduit 110 is formed shorter than an inner diameter of the inner flowing passage 31a of the piston, so that a first resonant space (S1) between the outer surface of the first guide conduit 110 and the corresponding inner surface of the piston 31. In addition, the rear end of the first guide conduit 110 abuts to the flange unit 31c formed on the rear end of the piston 31, but the front end of the first guide conduit 110 communicates with the inner flowing passage 31a because the length of the first guide conduit 110 is shorter than that of the entire inner flowing passage 31a formed inside the piston 31.

11
Also, on the front end of the first guide conduit 110, an outward flange unit 111 toward the inner circumferential wall of the inner flowing passage 31a so that the entrance of the first resonant space (S1) is stepped.
On the other hand, the second guide conduit 120 includes a large conduit unit 121 fixed to the rear frame 43, and a small conduit unit 122 coupled to the front side of the large conduit unit 121 and inserted into the first guide conduit 110.
The large conduit unit 121 includes a baffle unit 121A dividing the inside of the large conduit unit 121 into a plurality of resonant spaces (S2 and S3) is installed at least one (a baffle unit is shown in Figure), and it is desirable that the baffle unit 121A is installed in a vertical direction against the flowing direction of the gas.
Also, the large conduit unit 121 includes the baffle unit 121A; a first conduit unit 121B and a second conduit unit 121C-forming a body with the baffle unit 121A and forming a second resonant space (S2) and a third resonant space (S3) by coupling both sides of the baffle unit 121A; and a first side plate unit 121D and a second side plate unit 121E coupling to the other sides of the first and second conduit unit 121B and 121C, respectively.
Outer diameters of the first conduit unit 121B and the second conduit unit 121C are formed same as those of the baffle unit 121A and the respective side plate units 121D and 121E, and bores 121a, 121d, and 121e are formed in a central part of the baffle unit 121A and of the respective side plate units 121D and 121E at the same axial line with those of the suction pipe (SP), the small conduit unit 122, and the inner flowing passage 31a.

12
The first side plate unit 121D is located on front side of the large conduit unit 121, in which the small conduit unit 122 is coupled on its bore 121d, and a flange unit (not defined as a reference numeral) coupled to the rear frame 43 is formed on the second side plate unit 121E.
Also, it is desirable that an inner edge of the entrance of the small conduit unit 122 is formed round. In addition, the first conduit unit 121B and the first side plate 121D may be formed as a single body, and the other members are able to be welded by an ultrasonic welding or a brazing method.
Same components as those of the conventional art are designated by the same reference numerals.
Reference numeral 22B designates a magnet.
The suction gas guide system of a reciprocating compressor according to the present invention has effects as follows.
That is, when an electric source is applied to the reciprocating motor 20, accordingly a flux is formed between the inner stator 21A and the outer stator 21B, whereby the armature 22 with the piston 31 moves in accordance with the direction of the flux and undergoes linear reciprocating movement by the spring unit 50. Then, the piston 31 coupled to the armature 22 undergoes the linear reciprocating movement inside the cylinder 32 so that a pressure variance is repeatedly generated inside the cylinder 32. Accordingly, due to the pressure variance inside the cylinder 32, the refrigerant gas is sucked into the compressing space of the cylinder 32 through the inner flowing passage 31a in the piston 31, then compressed and discharged. And this process is repeated.

13
Hereinafter, the process will be described in more detail. First, as shown in Figure 5, the refrigerant gas (indicated as the real line arrow in drawing) is sucked and charged inside the shell 10 through the suction pipe (SP) during the suction stroke of the piston 31, and after that, the refirgerant gas charged in the shell 10 is sucked into the compressing space of the cylinder 32 as opening the suction valve 33 through the large conduit unit 121 and the small conduit unit 122 of the second guide conduit 120, the first guide conduit 110, and the gas passing hole 31b on the inner flowing passage 31a of the piston 31 during the continued suction stroke of the piston 31.
At that time, before the refrigerant gas sucked into the shell 10 is dispersed entire shelf 10, the gas is guided to the inner flowing passage 31a of the piston through the respective guide conduits 110 and 120, and the refrigerant gas guided into the inner flowing passage 31a is directly sucked into the compressing space as opening the suction valve 33 through the gas passing 31b, whereby the density of the gas per unit volume is increased, and therefore the efficiency of the compressor is able to be increased.
Also, as the refrigerant gas sucked into the shell 10 through the suction pipe (SP) is guided to the compressing space of the cylinder 43 through the gas guide unit 100, a direct contact of the gas to the motor can be prevented to a certain extent. And thereby increase of the specific volume of the refrigerant gas is able to be restrained, and accordingly, the amount of sucked gas is increased, whereby the efficiency of the compressor can be increased.
Also, the first guide conduit 110 and the second guide conduit 120 of the

14 gas guide unit 100 are disposed to be overlapped always when the piston 31
undergoes the reciprocating movement, and therefore the leakage of the refrigerant gas during the suction of the gas is able to be reduced. Accordingly, the suction rate of the refrigerant gas is increased, whereby the efficiency of the compressor also is able to be increased.
Also, the suction pipe (SP), the first guide conduit 110 and the second guide conduit 120 are disposed at the same axial line, especially, even though the large conduit unit 121 is located on the sucking side of the second guide conduit 120, the connecting part of the large conduit unit 121 and the small conduit unit 122 is formed as round, whereby the refrigerant gas is directly sucked into the compressing space of the cylinder 32 through the suction pipe (SP). Therefore, the suction rate of the refrigerant gas is increased, and the efficiency of the compressor can be increased.
After that, as shown in Figure 6, the refrigerant gas in the compressing space of the cylinder 32 is compressed during the compressing stroke of the piston 31, and then the gas is discharged by opening the discharge valve 34.
At that time, the suction valve 33 opened during the suction of the refrigerant gas is closed, and then the suction valve 33 is impacted to the front surface of the piston 31, whereby an impact noise (indicated as dotted line arrows in the drawing) between the valve 33 and the piston 31 is generated. And the noise travels in a direction opposite to the suction direction of the gas, but the noise of low frequency is attenuated in the first resonant space (S1) formed between the inner flowing passage 31a of the piston and the first guide conduit 110, and the noise

15
of high frequency is attenuated through the second resonant space (S2) and the third resonant space (S3) formed on the large conduit unit 121 in the second guide conduit 120, whereby the reliability of the compressor is increased.
Also, as the suction valve 33 is opened/closed, some of the refrigerant gas being sucked is counter flown, and accordingly the counter-flowing refrigerant gas causes a pressure pulsation by impact with the refrigerant gas being sucked through the inner flowing passage 31a of the piston 31. Then, the pressure pulsation disturbs the suction of the refrigerant gas by flowing to the opposite of the suction direction. However, the pressure pulsation is somewhat attenuated with the impact noise while flowing through the respective resonant space (S1, S2, and S3), whereby the amount of the refrigerant gas newly sucked is able to be increased, and the efficiency of the compressor can be increased.
In addition, the large conduit unit 121 is fixed on the rear frame 43 and does not move with the reciprocating movement of the piston 31, and therefore the flow resistance is restrained and the efficiency of the compressor is able to be increased.
Moreover, when the gas guide unit 100 is assembled, the large conduit unit 121 is molded as separated members and fabricated by the ultrasonic welding or by the brazing, and after that the large conduit unit 121 is assembled. Therefore the assembling process of the gas guide unit 100 is made in simple way, whereby the productivity can be increased.
Hereinafter, the another embodiment of the suction gas guide system for a reciprocating motor according to the present invention will be described.

16
In the embodiment described above, the first guide conduit 110 and the second guide conduit 120 are fixed on the piston 31 and on the frame 43 respectively as separate bodies. However, in the present embodiment, as shown in Figure 7, a first guide conduit 210 and a second guide conduit 220 may be fixed on the piston 31 together, or as shown in Figure 8, a first guide conduit 310 and a second guide conduit 320 may be fixed on the frame 43 together.
As for the embodiment shown in Figure 7, in case that the first guide conduit 210 and the second guide conduit 220 are fixed on the piston 31, the first guide conduit 210 is formed extending forward so as to be inserted in the inner flowing passage 31a, and the second guide conduit 220 is formed extending backward so as to oppose against the suction pipe (SP) of the shell 10 and to be overlapped with the bore 43a included in the frame 43 in a certain range.
Also, the first guide conduit 210 is formed to have an outer diameter shorter than the inner diameter of the piston 31 so that the outer surface of the first guide conduit 210 and the inner surface of the piston 31 form the first resonant space (S1), and an outward flange unit 211 is formed on front end of the first guide conduit 210.
On the contrary, the said large conduit unit 221 is formed on the coupled part with the piston 31 of the second guide conduit 220, and the said baffle unit 221A is formed on the large conduit unit 221. As described in the above embodiment, the large conduit unit 221 includes the baffle unit 221A; a first conduit unit 221B and a second conduit unit 221C coupled on both sides of the baffle unit 221A whereby forming the second resonant space (S2) and the third

17
resonant space (S3); and a first side plate unit 221D and a second side plate unit 221E coupled to the other sides of the first conduit unit 221B and the second conduit unit 221C.
Herein, it is desirable that the inner edge of the first guide conduit 210 entrance is formed roundly. In addition, in the large conduit unit 221 in the second guide conduit 220, the second conduit unit 221C and the second side plate unit 221E may be formed as a single body, and rest components can be able to be coupled by using ultrasonic welding or brazing.
As described above, in case that the first and second guide conduit 210 and 220 are all coupled to the piston 31, the first and second guide conduit 210 and 220 undergo the reciprocating movement along with that of the piston 31, whereby the conduits 210 and 220 guide the refrigerant gas sucked into the shell 10 to the compressing space of the cylinder 32. At this time, as the first and second guide conduit 21 and 220 are coupled together to the piston 31, the leakage of the refrigerant gas between the conduits 210 and 220 is prevented, and therefore the amount of sucked gas can be increased.
And the respective effects described in the above embodiment are similar with those of the present embodiment, and accordingly, the description for that is omitted.
As shown in Figure 8, in case that the first guide conduit 310 and the second guide conduit 320 are all fixed on the frame 43, the large conduit unit 321 including the baffle unit 321A is formed on the first guide conduit 310, and a extended unit 331 may be formed on the second guide conduit 320 so as to be

18 inserted in the bore 43a of the rear frame 43.
The first guide conduit 310 includes a large conduit unit 321 fixed on inner surface of the rear frame 43, and a small conduit unit 322 coupled to front side of the large conduit unit 321 and inserted into the inner flowing passage 31a.
Also, it is desirable that the first guide conduit 310 is always located inside the range of the inner flowing passage 31a when the piston 31 undergoes reciprocating movement, and the distance (a) from the end of the inner flowing passage 31a of the piston 31 to the front end of the small conduit unit 312 is shorter than the distance (b) between the rear side surface of the inner stator 21A and the inner surface of the magnet supporting member 22A because the first guide conduit 310 is fixed on the frame 43 apart from the piston 31.
The large conduit unit 321 includes the baffle unit 321A; a first conduit unit 321B and a second conduit unit 321C forming a body unit with the baffle unit 321A and coupled to both sides of the baffle unit.321A whereby forming the second resonant space (S2) and the third resonant space (S3); and a first side plate unit 321D and a second side plate unit 321E coupled to the other sides of the first and second conduit units 321B and 321C, respectively.
The first side plate unit 321D is located on front side of the large conduit unit 321 having a small conduit unit 322 coupled to its bore (not defined). And a flange unit (not defined) coupled to the rear frame 43 is formed on the second side plate unit 321E.
Also, the first conduit unit 321B and the first side plate unit 321D may be formed as a single body, and rest members may be welded and coupled by using

19 ultrasonic welding or brazing method.
It is desirable that an inner edge of the entrance end of the small conduit unit 322 is formed roundly.
On the other hand, an extended unit 321 penetrating the rear frame 43 as described above is formed extending from the flange unit (not defined) fixed on the rear frame 43 in the second guide conduit 320.
In that case, the first and second guide conduits 310 and 320 are all fixed on the frame, that is, a fixed body, accordingly, the weight of the piston 31 as an armature is reduced, whereby the efficiency of the motor is increased, moreover, a flow resistance is reduced.
The present embodiment has similar structure and effects as those of the embodiments described above, and the descriptions for that will be omitted.
Hereinafter, the another embodiment of the present invention will be described.
The gas guide unit in the embodiments described above includes the first guide conduit and the second guide conduit, however, in the present embodiment, the gas guide unit further includes an intermediate guide conduit between the first and second guide conduits. As shown in Figure 9, the intermediate guide conduit 430 is installed on rear side of the first guide conduit 410 fixed on the piston 31, and the second guide conduit 420 inserted into the intermediate guide conduit 430 slidabiy is fixedly coupled to the frame43.
The first guide conduit 410 is formed extending from the rear side of the piston 31 toward the frame 43, and a diameter of the first guide conduit 410 is

20
formed larger than that of the inner flowing passage 31a of the piston 31 so as to perform as the large conduit unit 411.
A baffle unit 411A dividing inside of the first guide conduit 410 into a plurality of resonant spaces (S2 and S3) is located in intermediate part of the first guide conduit 410. In addition, the first conduit unit 411B and the second conduit unit 411C are installed on both sides of the baffle unit 411 A, the first side plate unit 411D is installed on front surface of the first conduit unit 411B, and a connecting plate unit 411E forming the second side plate unit and connectively supporting the intermediate guide conduit 430 is installed on rear surface of the second conduit unit 41C.
It is desirable that the intermediate guide conduit 430 is installed at same axial line of the suction pipe (SP), the second guide conduit 420, and the inner flowing passage 31a of the piston 31.
Also, it is desirable that the inner diameter of the intermediate guide conduit 430 is formed larger than the outer diameter of the second guide conduit 420 so that the second guide conduit 420 is inserted into the intermediate guide conduit 430 slidably.
The rear end of the second guide conduit 420 is fixed on inner surface of the frame 43 and extended toward the piston 31, and the front end of the second guide conduit 420 is inserted so as to be overlapped with the middle guide conduit 430 always.
The effects of the present embodiment are similar with those of the embodiments described above, and therefore detailed descriptions for that are

21 omitted.
On the other hand, the gas guide unit may include a plurality of large conduit unit as shown in Figures 10 and 11.
That is, the embodiment shown in Figure 10 includes a second large conduit unit 421 formed on one side of the second guide conduit 420 in the embodiment shown in Figure 9. In that case, the second large conduit unit 421 is assembled in same way as that of the large conduit unit 411 of the first guide conduit 410, that is, the baffle unit 421A, the first conduit unit 421B, the second conduit unit 421C, the first side plate unit 421D, and the second side plate unit 421E are coupled by assembling them after separately molded.
Herein, the second guide conduit 420 includes the second large conduit unit 421 and a second small conduit unit 422 as described above, and the first conduit unit 421B and the first side plate unit 421D of the second large conduit unit 421 are formed as a single body, if necessary, and the other components may be coupled by using the ultrasonic welding or brazing. Also, it is desirable that the inner edge of the entrance of the second small conduit unit 422 is formed roundly.
On the other hand, as shown in Figure 11, the first guide conduit 410 may include a first small conduit unit 412 inserted inside of the piston 31 on the front side.
in that case, it is desirable that the outer diameter of the first small conduit unit 412 is formed shorter than the inner diameter of the inner flowing passage 31a so that the above-described resonant space (S1) is able to be located between the outer circumference of the first small diameter unit 412 and the inner

22 flowing passage 31a of the piston 31.
Also, it is desirable that an outward flange unit 412a is formed on end of the first small conduit unit 412 so that the efficiency of the resonant space (S1) can be increased.
Also, the middle guide conduit 430 and the second guide conduit 420 may be disposed conversely.
As described above, in case of the embodiments shown in Figures 10 and 11, the first large conduit unit 410 and the second large conduit unit 421 attenuate the noise, whereby the noise is reduced more efficiently. In particular, as shown in Figure 11, the small conduit unit 412 is inserted into the inner flowing passage 31a of the piston 31, whereby forming the resonant space (S1) with the piston 31. Therefore the noise of low frequency is able to be reduced in the resonant space (S1), whereby the efficiency of reducing noise can be increased more.
In addition to the effect described above, the present embodiment has same structure and effects as those of the embodiments described earlier, and the detailed descriptions for that are omitted.
INDUSTRIAL APPLICABILITY
As described above, in the suction gas guide system for the reciprocating
compressor according to the present invention, the gas guide conduit having both ends installed on the suction pipe of the shell and on the inner flowing passage of the piston facing each other and having the resonant space, is installed on same axial line so that the sucked gas inside the shell through the suction pipe

23 -
is guided to the inner flowing passage of the piston disposed on inner side of the motor, whereby the refrigerant gas is sucked smoothly into the inner flowing passage through the gas guide conduit, and therefore the suction rate of the refrigerant gas is increased. In addition, the noise and vibration generated during suction of the refrigerant gas is attenuated in the resonant space, and therefore the flow resistance against the sucked gas is reduced, whereby the efficiency and the reliability of the compressor is increased.
Also, the pre-heating of the refrigerant gas being sucked into the shell by the motor is prevented, and the specific volume of the refrigerant gas is not increased, whereby the efficiency of the compressor is able to be increased.
Also, the gas guide conduit is assembled after the components are molded, and therefore the assembling process of the gas guide conduit is easy to be performed, whereby the productivity is able to be increased.
As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalence of such meets and bounds are therefore intended to be embraced by the appended claims.

24
CLAIMS :o
1. A reciprocating compressor comprising :
a shell to which a suction pipe and a discharge conduit are connected ;
a reciprocating motor comprising a stator having an inner stator and an outer stator installed inside the shell with a predetermined air gap, and an armature disposed in the air gap between the two stators for reciprocating movement;
a compressor unit comprising a piston coupled to the armature of the reciprocating motor for reciprocating movement together with the armature, and having an inner flowing passage extending into the piston, and a cylinder supported inside of the reciprocating motor so that the piston is inserted into the cylinder slidably;
a frame unit supporting the reciprocating motor and the compressor unit ; and
a spring unit elastically supporting the armature of the reciprocating motor toward motion direction ;
characterised by a suction gas guide system comprising a gas guide conduit having both ends located inside the suction pipe and inside the inner flowing passage of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston.
2. The compressor as claimed in claim 1, wherein the gas guide conduit is located at the same axial line as that of the suction pipe of the shell.

25
3. The compressor as claimed in claim 1, wherein the gas guide conduit is
formed to be inserted into the inner flowing passage of the piston partially or
entirely.
4. The compressor as claimed in claim 1, wherein a flange unit flanged
toward inner surface of the inner flowing passage in the piston is formed on end
of the gas guide conduit.
5. The compressor as claimed in claim 1, wherein the gas guide conduit
comprises a first guide conduit extended toward inside of the inner flowing
passage of the piston, and a second guide conduit extended toward the frame
located between the piston and the suction pipe so as to communicate with the
first guide conduit.
6. The compressor as claimed in claim 5, wherein a large conduit unit, in
which the diameter is enlarged, is provided at least on one of the first and
second guide conduits.
7. The compressor as claimed in claim 5, wherein one of the first and
second guide conduits is inserted into the other conduit so as to be overlapped
in a predetermined range.

26
8. The compressor as claimed in claim 5, wherein the first guide conduit is
fixed on the piston, the second guide conduit is fixed on the frame located
between the piston and the suction pipe, and one of the first and second guide
conduits is inserted into the other conduit so as to be overlapped with the other
conduit in a predetermined range.
9. The compressor as claimed in claim 7 or claim 8, wherein the first guide
conduit is formed to be inserted into the second guide conduit.
10. The compressor as claimed in claim 5, wherein the first guide conduit and
the second guide conduit are fixed on the piston, and the second guide conduit
extends toward the suction pipe of the frame.
11. The compressor as claimed in claim 10, wherein a bore, through which
the second guide conduit passes, is formed on the frame disposed between the
piston and the suction pipe, an extended conduit extending toward the axial
direction of the second guide conduit is provided on outer circumference of the
bore, and the second guide conduit is inserted and overlapped with the extended
conduit.
12. The compressor as claimed in claim 5, wherein the first guide conduit and
the second guide conduit are fixed on the frame disposed between the piston
and the suction pipe, and the distance from the end of the first guide conduit

27
extending toward the inner flowing passage of the piston to the inner end of the inner flowing passage of the piston is longer than half of distance of the reciprocating movement of the piston.
13. The compressor as claimed in claim 5, wherein the first guide conduit or
the second guide conduit has a baffle unit, in which a bore of a predetermined
size is formed.
14. The compressor as claimed in claim 6, wherein a baffle unit having a bore
of a predetermined size is formed inside the large conduit unit.
15. The compressor as claimed in claim 7, wherein one of the first and
second guide conduits comprises a middle guide conduit which is adjacent to
outer circumference of the guide conduit inserted inside and has a
predetermined length toward the central line of the inserted guide conduit.
16. The compressor as claimed in claim 15, wherein the middle guide conduit
is coupled to the guide conduit which is located outer side between the first or
second guide conduit, and is overlapped in a predetermined range with the inner
guide conduit.

28
17. The compressor as claimed in claim 1, wherein the gas guide conduit
comprises a first guide conduit communicated to the inner flowing passage of the
piston, a second guide conduit communicated to the bore formed on the frame
between the piston and the suction pipe, and the middle conduit more than one
disposed between the first and second guide conduits.
18. The compressor as claimed in claim 17, wherein a large conduit unit
which has enlarged inner diameter comprises at least one of said first guide
conduit, the second guide conduit, and the middle guide conduit.
19. The compressor as claimed in claim 17, wherein at least one of said first
and second guide conduits is formed to have a larger inner diameter than the
other guide conduit.
20. The compressor as claimed in claim 17, wherein one of said first, second,
and middle guide conduits is disposed to be inserted into the other guide
conduit.
21. The compressor as claimed in claim 17, wherein the first guide conduit
and the second guide conduit are disposed to be overlapped in a predetermined
range when the piston undergoes reciprocating movement.

29
22. The compressor as claimed in claim 17, wherein a baffle unit having a
bore of a predetermined size is provided inside one of the first, second, and
middle guide conduits.
23. The compressor as claimed in claim 17, wherein the large conduit unit
which has enlarged inner diameter is formed on one of said first, second and
middle guide conduits, and the baffle unit having a bore is formed inside the
large conduit unit.
24. The compressor as claimed in claim 14, wherein the baffle unit is formed
on one of said first and second guide conduits, which has larger inner diameter
than that of the other guide conduit respectively.
25. The compressor as claimed in claim 17, wherein the middle guide conduit
is adjacent to outer surface of the guide unit which is inserted inside between
said first or second guide conduit, and is formed to have a predetermined length
toward the central line of the inserted guide conduit.
26. The compressor as claimed in claim 25, wherein the middle guide conduit
is coupled to the guide conduit located outside between the first or second guide
conduit so that the middle guide conduit is overlapped with the inside guide
conduit in a predetermined range.

30
27. The compressor as claimed in claim 17, wherein one of said first, second,
and middle guide conduits is inserted to inside of the other guide conduit,
whereby an overlapped portion of the two guide conduits is formed, and the
guide conduit which is inserted to inside the other conduit is disposed to pass the
bore of the baffle unit in accordance with the reciprocating movement of the
piston.
28. The compressor as claimed in claim 1, wherein a plurality of conduits are
disposed to be communicated organically with each other in the gas guide
conduit.
29. A reciprocating compressor as claimed in claim 1, wherein the gas guide
conduit comprises a first guide conduit communicated to the inner flowing
passage of the piston, and a second guide conduit communicated to a bore of
the frame disposed between the inner flowing passage of the piston and the
suction pipe.
30. The compressor as claimed in claim 29, wherein at least one of the first
and second guide conduits comprises a large conduit unit having larger inner
diameter than that of the other.

31
31. The compressor as claimed in claim 30, wherein a part or entire second
guide conduit is inserted inside the first guide conduit and is overlapped with the
first guide conduit.
32. The compressor as claimed in claim 30, wherein the first guide conduit
comprises a large conduit unit and a connecting plate unit which is connected to
the large conduit unit vertically and has a bore of a predetermined size, and the
second guide conduit is disposed to pass through the bore in the connecting
plate unit and to be inserted inside the large conduit unit of the first guide
conduit.
33. The compressor as claimed in claim 32, wherein a middle guide conduit
having a predetermined length toward the central line of the first guide conduit is
provided on the outer circumference of the bore in the connecting plate unit, and
the second is disposed to be adjacent to the inner side of the middle guide
conduit so as to be overlapped with the middle guide conduit.
34. The compressor as claimed in claim 30, wherein a baffle unit having a
bore of a predetermined size is provided inside the large conduit unit.
35. The compressor as claimed in claim 34, wherein the bore in the baffle unit
has a diameter same as outer diameter of the second guide conduit.

32
36. The compressor as claimed in claim 30, wherein the inner diameter of the
large conduit unit is larger than that of the inner flowing passage of the piston.
37. The compressor as claimed in any one of claims 6, 8, 10, 12 and 27,
wherein a flange unit for supporting the spring unit is formed on one of the first
guide conduit and the second guide conduit.
38. The compressor as claimed in claim 27, wherein the second guide conduit
has a rounded part which has a rounded surface from the suction pipe to the
piston.
39. The compressor as claimed in claim 29, wherein the first guide conduit is
inserted into the second guide conduit.
40. The compressor as claimed in any one of claims 1, 2, 17 and 29, wherein
a flange unit is formed on those guide conduits, coupled to the frame between
the piston and the suction pipe or to the piston, and the other guide conduits are
fixed centering around the guide conduit fixed on the frame or on the piston.
41. The compressor as claimed in any one of claims 6, 14, 29, 32, 34 and 36,
wherein the large conduit unit comprises a cylindrical conduit unit ; and a first
side plate unit and a second side plate unit which are connected to both ends of

33
the outer circumference of the conduit unit and have bores with smaller inner diameter than that of the conduit unit; and
one of the first and second side plate units is molded with the conduit unit as a single body.
42. The compressor as claimed in claim 41, wherein one of the first and
second side plate units is coupled to the conduit unit by using ultrasonic welding
or brazing method.
43. The compressor as claimed in any one of claims 6, 14, 29, 32, 34 and 36,
wherein the large conduit unit is fixed on the frame facing the suction pipe of the
shell.
44. The compressor as claimed in any one of claims 1, 2, 4, 5, 8, 9, 10, 12,
13, 15, 16, 17, 19, 25, 26, 27, 29, 33, 34, 35, 36, 38 and 42, wherein the guide
conduits are disposed to be located on same axial line.
A reciprocating compressor comprises :
a shell (10) to which a suction pipe (SP) and a discharge conduit (DP) are connected ;
a reciprocating motor (20) comprising a stator (21) having an inner and outer stators (21 A, 21B) installed inside the shell, and an armature (22) disposed in the air gap between the two stators ;
a compressor unit (30) comprising a piston (31) coupled to the armature (22), and having an inner flowing passage (31A) extending into the piston, and a cylinder (32) supported inside of the motor (20) so that the piston is slidable into the cylinder (32);
a frame unit (40) supporting the motor (20) and the compressor unit (30) and a spring unit (50) elastically supporting the armature (22) towards motion direction ; characterised by a suction gas guide system (100) comprising a gas guide conduit (110) having both ends located inside the suction pipe (SP) and in the inner flowing passage (31A) of the piston facing each other for guiding gas sucked inside the shell to the inner flowing passage of the piston.

Documents:

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Patent Number

202605

Indian Patent Application Number

01311/KOLNP/2003

PG Journal Number

09/2007

Publication Date

02-Mar-2007

Grant Date

02-Mar-2007

Date of Filing

14-Oct-2003

Name of Patentee

LG ELECTRONICS INC

Applicant Address

20 YOIDO-DONG, YONGDUNGPO-KU SEOUL 150-721

Inventors:

#	Inventor's Name	Inventor's Address
1	KANG KYUNG-SEOK	HANKOOK APT., 301-1402 OE-DONG,GYUNGSANG NAM -DO KIMHAE 621-756
2	WOO SUNG-TAE	SAMICK BEACH APT., A102-208, NAMCHUN2-DONG SUYOUNG-GU,BUSAN 613-751
3	HYEON SEONG YEOL	JUGONG APT., 209-302 SHINWOL-DONG, GYUNG-SANGNAM-DO ,CHANGWON 641-782

PCT International Classification Number

F 04 B 35/04

PCT International Application Number

PCT/KR01/00878

PCT International Filing date

2001-05-25

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	2001/20203	2001-04-16	Republic of Korea