Title of Invention

"A BLEEDING APPARATUS FOR DISCHARGING NON-CONDENSED GAS IN AN ABSORPTION TYPE REFRIGERATING MACHINE"

Abstract

A bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine to the outside of the machine, comprising a non-condense tank (2) which is connected to a main body portion (100) of the absorption type refrigerating machine and into which the non-condensed gas is introduced an oilless vacuum pump (5) which is connected to the non-condense tank (2) and discharges the non-condensed gas introduced into the non-condense tank (2); a pressure sensor (6) for detecting the pressure of the non-condensed gas introduced in the non-condense tank and moisture removing means as herein described which is located between the non-condense tank (2) and the oilless vacuum pump (5) and removes moisture remaining in the vacuum pump and/or water condensed in the vacuum pump and said moisture removing means has a radiation coil (7A) for subjecting the non-condensed gas to heat radiation and a gas-liquid separator (8) for subjecting the condensed gas to gas-liquid separation, the radiation coil (7A) and the gas-liquid separator (8) being disposed at the upstream side of the said vacuum pump.

Full Text

1. Field of the Invention The present invention relates to a bleeding apparatus for an absorption type refrigerator used for cooling/heating or the like. 2. Description of the Related Art As well known, an absorption type refrigerating machine is an apparatus comprising a regenerator, a condenser, an evaporator, an absorber, etc. which are successively connected to one another through pipes. According to this apparatus, refrigerant is circulated in the apparatus while absorbed or desorbed by absorption liquid such as aqueous solution of lithium bromide or the like to carry out heat transfer, which is used for cooling operation or heating operation. In the absorption type refrigerating machine thus constructed, the regenerator, the condenser, the evaporator, the absorber and the pipe portion for connecting these elements are formed of iron or stainless steel. Accordingly, when water is used as refrigerant and aqueous solution of lithium bromide containing inhibitor is used as absorption liquid, the absorption liquid reacts with metal of raw material of the equipment, so that hydrogen gas occurs when corrosion coat is formed. Particularly, since the absorption liquid is heated to 160°C during operation by the regenerator, the absorption liquid and metal easily react with each other, and thus a lot of hydrogen gas is liable to Furthermore, the absorption type refrigerating machine is designed as a high vacuum system as a whole, and thus the air-tightness is enhanced by welding, etc. However, invasion of atmospheric components through a pinhole, a connection portion or the like into the refrigerating machine is unavoidable, and the amounts (trap amounts) of atmospheric components such as nitrogen, oxygen, etc. thus invading in the refrigerating machine increase with time lapse. Hydrogen gas occurring according to the above mechanism and nitrogen and oxygen invading from the atmosphere are not condensed through the cooling operation of the refrigerating machine, and solubility of these elements into the absorption liquid is extremely small. Therefore, these elements are trapped in the evaporator and the non-solution portion of the absorber, and the concentrations thereof are gradually increased. When the concentrations of the non-condensed gas such as hydrogen, etc. are increased, evaporation of the refrigerant is suppressed, and thus the refrigerating performance is lowered. Therefore, there is known a technique of fixing a palladium pipe 3 to a n on-condense tank 2 extending from a gas-phase portion of a gas-liquid separator 1 connected to the absorption type refrigerating machine body 100 through an absorption liquid pipe and a gas phase pipe as shown in Fig. 7, and heating the palladium pipe 3 at about 300 to 500°C to pass through the wall surface of the palladium pipe 3 hydrogen gas which is separated from absorption liquid in the gas-liquid separator 1 and introduced into the non-condense tank 2, thereby discharging the hydrogen gas occurring in the non-condensed gas occurring in the absorption type refrigerating machine body. However, it is required to heat the palladium pipe 3 at 300 to 500°C at all times in the bleeding apparatus shown in Fig. 7 . Non-condensed gas which can be discharged through the palladium pipe 3 is limited to hydrogen gas, and thus there is a problem that atmospheric components such as nitrogen gas, oxygen gas, etc. which invade from a pinhole of a welding portion, a connection portion or the like cannot be discharged. In view of the foregoing problem, use of an oilless vacuum pump as a vacuum pump is proposed in JP-A-2003-146238. However, in the case of the oilless pump, when water component (drops of water) remains in the pump, the following disadvantages may be considered. For example, there occurs a problem that a vane (valve) in the pump is attached to a valve seat in a cylinder by drops of water adhering to the vane, so that malfunction of the vane occurs, and also there occurs a problem that when suction (expansion) is carried out under the state that the water component is contained in the cylinder, the expansion capacity of the water component is larger than the absorption capacity of the pump, and thus sufficient suction force cannot be achieved. Accordingly, it would be impossible to exercise sufficient performance of the absorption type refrigerating machine. SUMMARY OF THE INVENTION Therefore, the present invention has been implemented in view of the foregoing problems, and has an object to provide a bleeding apparatus for removing water component remaining or trapped in an oilless pump of an absorption type refrigerating machine so that .the performance of the absorption type refrigerating machine can be prevented from being degraded. According to a first aspect of the invention, a bleeding apparatus for discharging non-condensed gas containing hydrogen gas, etc. occurring in an absorption type refrigerating machine to the outside of the machine, is characterized by comprising a non-condense tank which intercommunicates with a main body portion of the absorption type refrigerating machine and into which the non-condensed gas is introduced; an oilless vacuum pump which intercommunicates with the non-condense_tank and discharges the non-condensed gas introduced into the non-condense tank; and moisture removing means which is located between the noncondense tank and the oilless vacuum pump and removes moisture remaining in the vacuum pump and/ox water condensed in the vacuum pump when the operation of the vacuum pump is started and/or finished. In the above bleeding apparatus, the moisture removing means includes a radiation coil for subjecting the non-condensed gas to heat radiation and a gas-liquid separator for subjecting the condensed non-condensed gas to gas-liquid separation, the radiation coil and the gas-liquid separator being disposed at the upstream side of the vacuum pump. In the above bleeding apparatus, the moisture removing means includes a branch circuit having a first end connected to the non-condense tank through a first electromagnetic opening/closing valve, a second end opened to the atmosphere through a second electromagnetic opening/closing valve and a third end connected to the oilless vacuum pump, the branch circuit being equipped at the upstream side of the vacuum pump, and the gas bleeding apparatus is further equipped with a controller for controlling the valve opening/closing operation of the first and second electromagnetic opening/closing valves so that one of the non-condensed gas in the non-condense tank and outside air from the atmosphere is selectively supplied to the oilless vacuum pump. In the above bleeding apparatus, the moisture removing means includes a three-way valve having a first port connected to the non-condense tank through an electromagnetic opening/closing valve, a second port opened to the atmosphere and a third port connected to the oilless vacuum pump, the three-way valve being equipped at the upstream side of the vacuum pump, and the gas bleeding apparatus is further equipped with a controller for controlling the opening/closing operation of the three-way valve so that at least one of the non-condensed gas in the non-condense tank and outside air from the atmosphere is selectively supplied to the oilless vacuum pump. The above bleeding apparatus further comprises a pressure sensor for detecting the pressure of the non-condensed gas introduced in the non-condense tank, wherein the moisture removing means introduces outside air from the atmosphere into the oilless vacuum pump when the pressure sensor detects a predetermined value, thereby removing the moisture remaining in the oilless vacuum pump. According to a second aspect of the present invention, a bleeding apparatus for discharging non-condensed gas containing hydrogen gas, etc. occurring in an absorption type refrigerating machine to the outside of the machine, is characterized by comprising-a non-condense tank which intercommunicates with a main body portion of the absorption type refrigerating machine and into which the non-condensed gas is introduced; an oilless vacuum pump which intercommunicates with the non-condense tank and discharges the non-condensed gas introduced into the non-condense tank; moisture removing means which is located between the non-condense tank and the oilless vacuum pump and removes moisture remaining in the vacuum pump and/or water condensed in the vacuum pump when the operation of the vacuum pump is started and/or finished, wherein the moisture removing means comprises a first passage through which the non-condensed gas is supplied to the oilless vacuum pump, a second passage through which the outside air from the atmosphere is passed, and a third passage which is connected to both the first and second passages and also connected to the oilless vacuum pump, and means for controlling flow of fluid in the first and second passages to select at least one of the non-condensed gas in the non-condense tank and the outside air from the atmosphere as fluid to be supplied to the oilless vacuum pump. In the above bleeding apparatus, the third passage comprises a radiation coil for subjecting the non-condensed gas flowing through the first passage to heat radiation and a gas-liquid separator for subjecting the heat-radiated non-condensed gas to gas-liquid separation-According to the bleeding apparatus of the absorption type refrigerating machine of the present invention, the non-condensed gas such as hydrogen gas, etc. occurring in the absorption type refrigerating machine and the non-condensed gas such as atmospheric components invading into the refrigerating machine can be surely discharged to the outside of the refrigerating machine without being affected by the water component contained in the non-condensed gas. The present invention relates to a bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine to the outside of the machine, compriseing a non-condense tank which is connected to a main body portion of the absorption type refrigerating machine and into which the non-condensed gas is introduced; an oilless vacuum pump which is connected to the non-condense tank and discharges the non-condensed gas introduced into the non-condense tank ; and moisture removing means which is located between the non-condense tank and the oilless vacuum pump and removes moisture remaining in the vacuum pump and/or water condensed in the vacuum pump and said moisture removing means has, a radiation coil for subjecting the non-condensed gas to heat radiation and a gas-liquid separator for subjecting the condensed gas to gas-liquid separation, the radiation coil and the gas-liquid separator being disposed at the upstream side of the said vacuum, pump. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an embodiment of the present invention; Fig. 2 is a diagram showing an oilless pump used in the embodiment; Fig. 3 is a timing chart showing the control of removing water component a vacuum pump after a gas bleeding operation is finished; Fig. 4 is a timing chart showing the control of removing water component in a vacuum pump at the start time and end time of the air bleeding operation. Fig. 5 is a diagram showing an embodiment of the present invention; Fig. 6 is a timing chart showing the control of removing water component in a vacuum pump at the operation start time and operation end time of the gas bleeding operation; and Fig. 7 is a diagram showing a prior art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described hereunder with reference to the accompanying drawings. A bleeding apparatus (gas bleeding apparatus) according to an embodiment of the present invention will be described with reference to Figs. 1 and 2. In order to make the present invention easily understood, constituent elements having the same functions as those of Fig. 7 are represented by the same reference numerals. In the bleeding apparatus of the embodiment of the present invention, as shown in Fig. 1, an oilless type vacuum pump 5 is connected to a non-eondense tank 2 through a gas-liquid separating box 8, etc. so that it can intercommunicate with the non-condense tank 2. A gas bleed pipe (or an air bleed pipe) 7 having electromagnetic opening/closing valves 4A to 4C is connected to the non-condense tank 2 at one end thereof and also connected to the gas-liquid separating box 8 at the other end thereof. The gas bleed pipe 7 is equipped with a radiation coil 7A at the side of the gas-liquid separating box 8. The electromagnetic opening/dosing valves 4A, 4B are equipped in the gas bleed pipe 7 so as to be arranged in series, and the electromagnetic opening/closing valve 4C is equipped to a branch pipe which is branched from the gas bleed pipe 7 and opened to the atmosphere at one end thereof A drain pipe 9 having an opening/closing valve 9A interposed therein is connected to the bottom plate of the gas-liquid separating box 8, and refrigerating liquid, etc. stocked in the gas-liquid separating box 8 can be suitably discharged through the drain pipe 9 by opening the opening/closing valve 9A. The oilless type pump 5 is equipped to the terminal portion of a gas bleed pipe 7Z which is equipped so as to extend from the ceiling plate portion of the gas-liquid separating box 8 to the vacuum pump 5. Liquid such as refrigerant, etc. are condensed by radiating heat to the atmosphere (air) (i.e., carrying out heat-exchange with the atmosphere (air)) while passing through the radiation coil 7A of the gas bleed pipe 7, and then stocked at the bottom portion in the gas-liquid separating box 8, so that only non-condensed gas is extracted from the gas bleed pipe 7Z, and only the non-condensed gas reaches the vacuum pump 5, Fig. 2 shows the inner construction of the vacuum pump 5 of this embodiment. As shown in Fig. 2, the vacuum pump 5 comprises a first discharge mechanism 10 and a second discharge mechanism 30. The first discharge mechanism 10 is equipped with a gas intake chamber 14 having an intake-chamber intake port 11 and an intake-chamber exhaust port 13 which is opened/closed by an opening/closing valve 12, a gas exhaust chamber 18 having an exhaust-chamber exhaust port 15 and an exhaust-chamber intake port 17 which is opened/closed by an opening/closing valve 16, and a cylinder 20 containing therein a piston 19 which is reciprocatively moved so as to reach the portion corresponding to the intake-chamber exhaust port 13 and the exhaust-chamber intake port 17. The openingtelosing valve 12 opens the intake-chamber exhaust port 13 when the piston 19 moves downwardly in Fig. 2 and thus the volume of the inner space 21 of the cylinder 20 is increased to thereby reduce the inner pressure of the cylinder 20. In addition, the opening/closing valve 12 closes the intake-chamber exhaust port 13 when the piston 19 moves upwardly and thus the volume of the inner space 21 of the cylinder 20 is reduced to thereby increase the inner pressure of the cylinder 20. Furthermore, the opening/closing valve 16 closes the exhaust-chamber intake port 17 when the piston 19 moves downwardly in Fig. 2 and thus the volume of the inner space 21 of the cylinder 20 is increased to thereby reducing the inner pressure of the cylinder 20. In addition, the opening/closing valve 16 opens the exhaust-chamber intake port 17 when the piston 19 moves upwardly and thus the volume of the inner space 21 of the cylinder 20 is reduced to thereby increase the inner pressure of the cylinder 20. The second discharge mechanism 30 is equipped with a gas intake chamber 34 having an intake-chamber intake port 31 and an intake-chamber exhaust port 33 which is opened/closed by the opening/closing valve 32, a gas exhaust chamber 38 having an exhaust-chamber exhaust port 35 and an exhaust-chamber exhaust port 37 which is opened/closed by the opening/closing valve 36, and a cylinder 40 having therein a piston 39 which is reciprocatively moved so as to reach the portion corresponding to the intake-chamber exhaust port 33 and the exhaust-chamber intake port 37. The opening/closing valve 32 opens the intake-chamber exhaust port 33 when the piston 39 moves downwardly in Fig. 2 and thus the volume of the inner space 41 of the cylinder 40 is increased to thereby reduce the inner pressure of the cylinder 40, and also closes the intake-chamber exhaust port 33 when the piston 39 moves upwardly and thus the volume of the inner space 41 of the cylinder 40 is reduced to thereby increase the inner pressure of the cylinder. Furthermore, the opening/closing valve 36 closes the exhaust-chamber intake port 37 when the piston 39 moves downwardly and thus the volume of the inner space 41 of the cylinder 40 is increased to thereby reduce the inner pressure of the cylinder 40, and also opens the exhaust-chamber intake port 37 when the piston 39 moves upwardly in Fig. 2 and thus the volume of the inner space 41 of the cylinder 40 is reduced to thereby increase the inner pressure of the cylinder 40. The piston 19 of the first discharge mechanism 10 is linked to a rotational shaft 51L of a motor 50 through a crank 52L, and the piston 39 of the second discharge mechanism 30 is linked to a rotational shaft 51R of the motor 50 through a crank 52E. The rotational motions of the driving shafts 51L, 51R by the motor 50 are converted to reciprocal motions of the pistons 19, 39, so that the pistons reciprocatively moves in the respective cylinders 20 and 40. The piston 19 of the first discharge mechanism 10 and the piston 39 of the second discharge mechanism are disposed in the cylinders 20 and 40 respectively so as to move in the opposite directions to each other. Accordingly, when the piston 19 of the first discharge mechanism 10 moves downwardly, the piston 39 of the second discharge mechanism 30 moves upwardly. When the piston 19 of the first discharge mechanism 10 moves upwardly, the piston 39 of the second discharge mechanism 30 moves downwardly. Therefore, when the piston 19 of the first discharge mechanism 10 moves downwardly and thus the volume of the inner space 21 of the cylinder 20 is increased to thereby reduce the pressure of the inner space 21 of the cylinder 20, both the opening/closing valves 12 and 16 are downwardly swung to thereby open the intake-chamber exhaust port 13 and close the exhaust-chamber intake port 17, so that non-condensed gas introduced from the intake-chamber intake port 11 into the intake chamber 14 passes through the intake-chamber exhaust port 13 and enters the inner space 21 of the cylinder 20. When the piston 19 of the first discharge mechanism 10 moves downwardly in Fig. 2 and the non-condensed gas of the intake chamber 14 is introduced from the intake-chamber exhaust port 13 into the inner space 21 of the cylinder 20 whose volume is increased, the piston 39 of the second discharge mechanism 30 moves upwardly in Fig. 2, and the volume of the inner space 41 of the cylinder 40 is reduced, so that the pressure of the inner space 41 of the cylinder 40 is increased. Therefore, the opening/closing valves 32, 36 are upwardly swung to close the intake-chamber exhaust port 33 and open the exhaust-chamber intake port 37. Therefore, non-condensed gas which is filled in the exhaust chamber 18 of the first discharge mechanism 10, the intake chamber 34 of the second discharge mechanism 30 and the joint pipe between the first discharge mechanism 10 and the second discharge mechanism 30 is not introduced into the inner space 41 of the cylinder 40, and non-condensed gas introduced in the inner space 41 of the cylinder 40 is exhausted from the exhaust-chamber intake port 37, the exhaust chamber 38 and the exhaust-chamber exhaust port 35. On the other hand, when the piston 19 of the first discharge mechanism 10 moves upwardly and thus the volume of the inner space 21 of the cylinder 20 is reduced to thereby increase the pressure of the inner space 21 of the cylinder 20, the opening/closing valves 12, 16 are upwardly swung in Fig. 2 to close the intake-chamber exhaust port 13 and open the exhaust-chamber intake port 17, so that the non-condensed gas of the intake chamber 14 is not introduced into the inner space 21 of the cylinder 20 and the non-condensed gas introduced in the inner space 21 of the cylinder 20 passes through the exhaust-chamber intake port 17 and enters the exhaust chamber 18. When the piston 19 of the first discharge mechanism 10 moves upwardly in Fig. 2 and the non-condensed gas is protruded from the inner space 21 of the cylinder 20 into the exhaust chamber 18 as described above, the piston 39 of the second discharge mechanism 30 moves downwardly and thus the volume of the inner space 41 of the cylinder is increased to thereby reduce the pressure of the inner space 41 of the cylinder 40. Therefore, both the opening/closing valves 32, 36 are downwardly swung to open the intake-chamber exhaust port 33 and close the exhaust-chamber intake port 37. Therefore, no outside air is passed through the exhaust-chamber exhaust port 35, the gas exhaust chamber 38 and the exhaust-chamber exhaust port 37 and introduced into the inner space 41 of the cylinder 40, and the non-condensed gas in the exhaust chamber 18 of the first discharge mechanism 10, the intake chamber 34 of the second discharge mechanism 30 and the joint pipe between the first discharge mechanism 10 and the second discharge mechanism 30 is introduced from the intake-chamber exhaust port 33. Accordingly, by actuating the motor 50 to make the pistons 19, 39 reciprocatively move in the cylinders 20, 40 and also opening the electromagnetic opening/closing valves 4A to 4C, the non-condensed gas trapped in the non-condensed tank 2 can be exhausted. Next, the operation of the gas bleeding apparatus of the present invention will be described. In Fig. 1, reference numeral 60 represents a controller of the gas bleeding apparatus, reference numeral 61 represents alarm means, and reference numeral 6 represents a pressure sensor for detecting the pressure of non-condense gas in the non-condense tank 2. As not shown, the controller 60 is electrically connected to the alarm means, and also connected to the other elements such as the pressure sensor 6, the electromagnetic opening/closing valves 4A to 4C, the opening/closing valve 9A, etc. to be controlled. As shown in a timing chart of Fig. 3, when the pressure sensor 6 equipped to the non-condense tank 2 detects high pressure, for example, lOkPa (the set value is variable), the motor 50 is started by the controller 60, After a predetermined time tl elapses from the start of the motor 50, the electromagnetic opening/closing valves 4A, 4B are opened by the controller 60, and the non-condensed gas stocked in the non-condense tank 2 is discharged to the atmosphere through the pipe 7 to carry out the gas bleeding operation. When the pressure sensor 6 detects predetermined low pressure, for example, 4kPa (the set value is variable), the electromagnetic opening/closing valves 4A, 4B are closed by the controller 60, and when a predetermined time t2 elapses, the electromagnetic opening/closing valve 4C is opened by the controller 60 for a predetermined time t3, whereby the atmosphere (outside air) is sucked and discharged from the gas bleeding pipe 7B through the radiation coil 7A and the gas-liquid separator (separating box) 8 into the vacuum pump 5, thereby removing moisture (water) remaining in the vacuum pump 5. The motOT 50 is controlled to be stopped substantially in synchronism with the valve closing operation of the electromagnetic opening/closing valve 4C or stopped slightly more early than the valve closing operation of the electromagnetic opening/closing valve 4C. Accordingly, the operation of the vacuum pump 5 can be stopped under the state that the moisture (water) which is contained in the non-condensed gas and remains in the vacuum pump 5 is removed, and thus operation failure of the vacuum pump 5 due to the moisture can be prevented from occurring. As shown in a timing chart of Fig. 4, the control of opening the electromagnetic opening/closing valve 4C for a predetermined time t4 substantially in synchronism with the start of the operation of the vacuum pump 5 may be carried out in addition to the control shown in the timing chart of Fig. 3. However, the electromagnetic opening/closing valve 4C must be necessarily closed before the electromagnetic opening/closing valves 4A, 4B are opened. That is, the predetermined time t4 must be set to a value less than the predetermined time tl as shown in Fig. 4. As described above, the electromagnetic opening/closing valve 4C is temporarily opened simultaneously with the start of the operation of the vacuum pump 5 to circulate the atmosphere (outside air) into the vacuum pump 5. Thereafter, the electromagnetic opening/closing valve 4C is closed and then the electromagnetic opening/closing valves 4A, 4B are opened to carry out the gas bleeding operation of the non-condensed gas stocked in the non-condense tank 2. Therefore, the gas bleeding operation can be started under the state that the moisture of the non-condensed gas remaining in the vacuum pump 5 is sufficiently removed, and thus the suction performance of the vacuum pump 5 can be sufficiently exercised from the start of the gas bleeding operation. A gas bleeding apparatus shown in Fig. 5 may be used as the gas bleeding apparatus as described above. The gas bleeding apparatus shown in Fig. 5 is achieved by replacing the electromagnetic opening/closing valves 4B, 4C shown in Fig. 1 by a threeway valve 4D. Under OFF-state, the three-way valve 4D is set in such a direction that the vacuum pump 5 and the non-condense tank 2 intercommunicate with each other through the gas-liquid separating box 8, and under ON-state the three-way valve 4D is set in such a direction that the suction side of the vacuum pump 5 intercommunicates with the atmosphere through the gas-liquid, separating box 8. The operation of the gas bleeding apparatus shown in Fig. 5 will be described. By referring to the timing chart of Fig. 6, when the pressure sensor 6 equipped to the non-condense tank 2 detects predetermined high pressure, for example, l0kPa (the set value is variable), the motor 50 is started while keeping the three-way valve 4D to OFF-state by the controller 60, and then the three-way valve 4D is set to ON-state by the controller 60 after a predetermined time t5 elapses from the start of the motor 50. Accordingly, like the timing chart of Fig. 4, the atmosphere (outside air) is circulated in the vacuum pump 5 simultaneously with the start of the operation of the vacuum pump 5 to remove the moisture (water) of the non-condensed gas remaining in the vacuum pump 5, and then the gas bleeding operation is started. Therefore, the suction performance of the vacuum pump 5 can he sufficiently exercised from the start of the gas bleeding operation. When the pressure sensor 6 detects predetermined low pressure, for example, 4kPa (the set value is variable), the electromagnetic opening/closing valve 4A is closed, the three-way valve 4D is set to OFF-state by the controller 60 after a predetermined time t7 elapses, and the vacuum pump 5 is stopped after a predetermined time t8 elapses. Accordingly, as in the case of the timing chart of Fig. 4, the moisture remaining in the vacuum pump 5 contained in the non-condensed gas is removed, and the operation of the vacuum pump 5 can be stopped. The present invention is not limited to the above embodiments, and various modifications may be made to the above embodiments without departing from the subject matter of the present invention. For example, in Fig. 1, the gas bleeding pipe 7B may be equipped at any position between the electromagnetic opening/closing valve 4B and the vacuum pump 5, and in Fig. 5, the gas bleeding pipe 7B may be equipped at any position between the electromagnetic opening/closing valve 4A and the vacuum pump 5. Furthermore, for example, a judgment as to whether the performance of the gas bleeding apparatus is lowered may be performed through the comparison between the variation speed of the pressure detected by the pressure sensor 6 and a standard value. WE CLAIM: 1. A bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine to the outside of the machine, comprising: a non-condense tank (2) which is connected to a main body portion (100) of the absorption type refrigerating machine and into which the non-condensed gas is introduced; an oilless vacuum pump (5) which is connected to the non-condense tank (2) and discharges the non-condensed gas introduced into the non-condense tank (2); a pressure sensor (6) for detecting the pressure of the non-condensed gas introduced in the non-condense tank and moisture removing means as herein described which is located between the non-condense tank (2) and the oilless vacuum pump (5) and removes moisture remaining in the vacuum pump and/or water condensed in the vacuum pump and said moisture removing means has a radiation coil (7A) for subjecting the non-condensed gas to heat radiation and a gas-liquid separator (8) for subjecting the condensed gas to gas-liquid separation, the radiation coil (7A) and the gas-liquid separator (8) being disposed at the upstream side of the said vacuum pump. 2. The bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine as claimed in claim 1, wherein said moisture removing means has a branch circuit (4A, 4B, 7, 7B and 4C) having a first end connected to the said non-condense tank (2) through a first electromagnetic opening/closing valves (4A, 4B)), a second end opened to the atmosphere through a second electromagnetic opening/closing valves (4C) and a third end connected to the said oilless vacuum pump (5), the said branch circuit being placed at the upstream side of the said vacuum pump, and the gas bleeding apparatus is equipped with a controller (60) for controlling the valve opening/closing operation of the first and second electromagnetic opening/closing valves (4A, 4B, 4C). 3. The bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine as claimed in claim 1, wherein said moisture removing means has a three-way valve (4D) having a first port connected to the said non-condense tank (2) through said electromagnetic opening/closing valve {4A), a second port opened to the atmosphere and a third port connected to the said oilless vacuum pump (5), the three-way valve being equipped at the upstream side of the said vacuum pump, and the gas bleeding apparatus is equipped with a controller (60) for controlling the opening/closing operation of the three-way valve. 4. A bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine to the outside of the machine as claimed in claim 1, wherein the said moisture removing means comprises a first passage (7) through which the non-condensed gas is supplied to the said oilless vacuum pump, a second passage (7B) through which the outside air from the atmosphere is passed, and a third passage (7A, 8, 7Z) which is connected to both the said first and second passages and also connected to the said oilless vacuum pump (5), and means for controlling flow of fluid in the said first and second passages to select at least one of the non-condensed gas in the non-condense tank and the outside air from the atmosphere as fluid to be supplied to the oilless vacuum pump. 5. The bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine as claimed in claim 4, wherein said third passage comprises a radiation coil {7A) for subjecting the non-condensed gas flowing through the first passage to heat radiation and a gas-liquid separator (8) for subjecting the heat-radiated condensed gas to gas-liquid separation. 6. A bleeding apparatus for discharging non-condensed gas in an absorption type refrigerating machine to the outside of the machine substantially as hereinbefore described with reference to the accompanying drawings.

Documents:

2436-del-2004-abstract.pdf

2436-del-2004-claims-(as files).pdf

2436-del-2004-claims.pdf

2436-del-2004-complete specification(as files).pdf

2436-del-2004-complete specification(granted).pdf

2436-DEL-2004-Correspondence-Others (15-01-2010).pdf

2436-del-2004-correspondence-others.pdf

2436-del-2004-correspondence-po.pdf

2436-del-2004-description (complete)-(as files).pdf

2436-del-2004-description (complete).pdf

2436-del-2004-drawings.pdf

2436-del-2004-form-1.pdf

2436-del-2004-form-19.pdf

2436-del-2004-form-2.pdf

2436-DEL-2004-Form-3 (15-01-2010).pdf

2436-del-2004-form-3.pdf

2436-del-2004-form-5.pdf

2436-del-2004-gpa.pdf