Title of Invention | DEVICE FOR FILTERING AN AIR STREAM |
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Abstract | In order to provide a device (1) for filtering an air stream (2), with at least one preseparator (3) for the separation of coarse impurities and with a filter unit (5), following the preseparator (3) in the direction of the air stream (2), for filtering smaller impurities, said device making it possible to have constant separation rates and constant pressure drops even in the case of air streams of different size, a multiplicity of preseparators (3) arranged parallel to one another are proposed, at least one air flap (4) being arranged upstream of the preseparators (3) in the direction of the air stream (2) and being designed for setting the air stream which passes through the preseparators (3). |
Full Text | 2006P18746 IN - 1 - Description Device for filtering an air stream The invention relates to a device for filtering an air stream, with at least one preseparator for the separation of coarse impurities and with a filter unit, following the preseparator in the direction of the air stream, for filtering smaller impurities. Such a device is already known, for example, from DE 689 05 389 T2 . This describes a device for filtering outside air, which has a preseparator for separating coarse impurities, such as dust, pollen or the like. The preseparator is followed in the path of the air stream by a filter unit which is set up for filtering the air stream by means of filter cartridges consisting, for example, of suitable cellulose. In this case, the filter cartridge also retains finer dirt particles and thus ensures that an emerging air stream is essentially dust-free. DE 698 16 009 T2 discloses a cyclone separation device, as it is known. Cyclone separators have suitable guide means for swirling an entering air stream. Coarse dirt particles, such as dust or the like, are carried outward due to the swirling and are separated. DE 298 19 335 U1 describes a device for filtering outside air, a preseparator and a filter unit being arranged in the path of an air stream. The preseparator consists of a multiplicity of cyclone separators arranged parallel to one another. The generic device already known has the disadvantage that, in the case of air streams of different size, different degrees of separation and pressure drops are generated. This may, however, be disadvantageous for other following devices, such as, for example, air-conditioning systems or the like. 2006P18746 IN - 2 - The object of the invention, therefore, is to provide a device of the type initially mentioned, which makes it possible to have constant separation rates and constant pressure drops, even in the case of air streams of different size. The invention achieves this object by means of a multiplicity of preseparators arranged parallel to one another, at least one air flap being arranged upstream of the preseparators in the direction of the air stream and being designed for setting the air stream which passes through the preseparators. According to the invention, a multiplicity of preseparators are provided, which are arranged parallel to one another. In this case, an air flap serves or a plurality of air flaps serve for setting the air stream. The air flap or the air flaps therefore determines or determine the number of preseparators through which the air stream passes, and also the air volume which passes through the preseparators within a predetermined period of time. Thus, for example, it is possible to generate high air streams in which a large air volume passes through the device according to the invention within a short period of time. In this case, at the same time, the number of preseparators through which the air stream passes increases. The air stream in each preseparator thus remains essentially constant, and therefore the degree of separation of the preseparator and of the overall device according to the invention also remains essentially constant. Furthermore, due to the larger flow impact area for the air stream, the resistance and therefore the pressure drop provided by the device according to the invention are kept constant. Advantageously, a fan is provided for generating the air stream. The fan is expediently connected to an energy supply and can be operated, for example, from the driver's cab of a 2006P18746 IN - 3 - rail vehicle. The device according to the invention is suitable particularly for use in a rail vehicle. According to a further development which is expedient in this respect, the fan is designed for generating air streams of different size. On account of this expedient further development, the device according to the invention can be adapted in a simple way to different requirements, for example by increasing the rotational speed of the pump by means of a variable drive. The fan expediently follows the filter in the direction of the air stream. According to a preferred refinement of the invention, regulation means for setting each air flap as a function of a predetermined desired value are provided. The desired value corresponds, for example, to a desired volume throughflow through the device according to the invention, the regulation means having a desired-value actuator, by means of which the position of the air flap is set so that a predetermined pressure drop is established. Expediently, the preseparators are cyclone separators. Cyclone separators are known according to the popular prior art, and therefore need not be dealt with in any more detail at this juncture. Further expedient refinements and advantages of the invention are the subject matter of the following description of exemplary embodiments of the invention, with reference to the figures of the drawing in which the figure shows a diagrammatic illustration of an exemplary embodiment of the device according to the invention. 2006P18746 IN - 4 - The figure shows, in a diagrammatic illustration, an exemplary embodiment of the device 1, according to the invention, which has a preseparator 3, arranged in the path of an air stream 2, in the form of a cyclone separator 3. The cyclone separator 3 illustrated in the figure stands symbolically for a multiplicity of cyclone separators 3 arranged parallel to one another. An air flap 4 precedes the cyclone separators 3 in the direction of the air stream. By the air flap 4 being opened or closed by control means, not illustrated in the figure, the air stream 2 passes through the cyclone separator 3, arranged downstream of the air flap 4, as a function of the position of the air flap 4. The f ree-throughf low cross section of the overall cyclone separator is therefore dependent on the position of the air flap 4. The cyclone separator 3 is followed by a filter unit 5 which has, for example, a conventional filter cartridge. Filter units are known as such to a person skilled in the art, and therefore do not need to be dealt with in any more detail at this juncture. The filter unit 5 is followed by a variable-speed fan 6 which is driven by an energy supply unit 7. The device illustrated in the figure is, for example, part of a rail vehicle and precedes the ventilation and air-conditioning system of the rail vehicle. It serves for sucking in outside air which first enters the preseparator 3, depending on the position of the air flap 4. The outside air is prepurified in the preseparator 3, so that coarse suspended particles, dust or the like are removed from the air stream 2. The air stream 2 subsequently passes through the filter unit 5 and its filter cartridge, which retains finer dirt particles as a function of the pore size of the system used. The air stream 2 subsequently passes through the fan and leaves the device 1, purified ambient air being provided for the following ventilation and air-conditioning system. 2006P18746 IN - 5 - By virtue of this device according to the invention, therefore, the degree of separation, the filtration class and the pressure drop of the air stream when it passes through the device, which is arranged, for example, in a suitable duct-shaped housing, can be set in any desired way. The preseparator 3 therefore has a variable active cross section, specifically depending on the position of the air flap 4. The pressure drop of the device according to the invention can thus be preselected. Furthermore, the device according to the invention provides a constant degree of separation even for different air streams. 2006P18746 IN - 6 - Patent Claims 1. A device (1) for filtering an air stream (2), with at least one preseparator (3) for the separation of coarse impurities and with a filter unit (5) , following the preseparator (3) in the direction of the air stream (2), for filtering smaller impurities, characterized by a multiplicity of preseparators (3) arranged parallel to one another, at least one air flap (4) being arranged upstream of the preseparators (3) in the direction of the air stream (2) and being designed for setting the air stream which passes through the preseparators (3). 2. The device (1) as claimed in claim 1, characterized by a fan (6) for generating the air stream (2). 3. The device (1) as claimed in claim 2, characterized in that the fan (6) is designed for generating air streams of different size. 4. The device (1) as claimed in claim 2 or 3, characterized in that the fan (6) follows the filter (5). 5. The device (1) as claimed in one of the preceding claims, characterized by regulation means for setting each air flap (4) as a function of a predetermined desired quantity. 6. The device (1) as claimed in one of the preceding claims, characterized in that each preseparator is a cyclone separator (3) . In order to provide a device (1) for filtering an air stream (2), with at least one preseparator (3) for the separation of coarse impurities and with a filter unit (5), following the preseparator (3) in the direction of the air stream (2), for filtering smaller impurities, said device making it possible to have constant separation rates and constant pressure drops even in the case of air streams of different size, a multiplicity of preseparators (3) arranged parallel to one another are proposed, at least one air flap (4) being arranged upstream of the preseparators (3) in the direction of the air stream (2) and being designed for setting the air stream which passes through the preseparators (3). |
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01184-kol-2007-correspondence others 1.1.pdf
01184-kol-2007-correspondence others.pdf
01184-kol-2007-description complete.pdf
01184-kol-2007-priority document.pdf
1184-KOL-2007-(11-01-2012)-ABSTRACT.pdf
1184-KOL-2007-(11-01-2012)-CLAIMS.pdf
1184-KOL-2007-(11-01-2012)-CORRESPONDENCE.pdf
1184-KOL-2007-(11-01-2012)-DESCRIPTION (COMPLETE).pdf
1184-KOL-2007-(11-01-2012)-DRAWINGS.pdf
1184-KOL-2007-(11-01-2012)-FORM-1.pdf
1184-KOL-2007-(11-01-2012)-FORM-2.pdf
1184-KOL-2007-ABSTRACT 1.1.pdf
1184-KOL-2007-AMANDED CLAIMS.pdf
1184-KOL-2007-AMANDED PAGES OF SPECIFICATION.pdf
1184-KOL-2007-CORRESPONDENCE OTHERS 1.2.pdf
1184-KOL-2007-CORRESPONDENCE.pdf
1184-KOL-2007-DESCRIPTION (COMPLETE) 1.1.pdf
1184-KOL-2007-DRAWINGS 1.1.pdf
1184-KOL-2007-EXAMINATION REPORT.pdf
1184-KOL-2007-GRANTED-ABSTRACT.pdf
1184-KOL-2007-GRANTED-CLAIMS.pdf
1184-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf
1184-KOL-2007-GRANTED-DRAWINGS.pdf
1184-KOL-2007-GRANTED-FORM 1.pdf
1184-KOL-2007-GRANTED-FORM 2.pdf
1184-KOL-2007-GRANTED-LETTER PATENT.pdf
1184-KOL-2007-GRANTED-SPECIFICATION.pdf
1184-KOL-2007-PETITION UNDER RULE 137.pdf
1184-KOL-2007-REPLY TO EXAMINATION REPORT 1.1.pdf
1184-KOL-2007-REPLY TO EXAMINATION REPORT.pdf
Patent Number | 252744 | ||||||||
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Indian Patent Application Number | 1184/KOL/2007 | ||||||||
PG Journal Number | 22/2012 | ||||||||
Publication Date | 01-Jun-2012 | ||||||||
Grant Date | 29-May-2012 | ||||||||
Date of Filing | 28-Aug-2007 | ||||||||
Name of Patentee | SIEMENS AKTIENGESELLSCHAFT | ||||||||
Applicant Address | WITTELSBACHERPLATZ 2, 80333 MUNCHEN | ||||||||
Inventors:
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PCT International Classification Number | B01D39/16; B01D46/02 | ||||||||
PCT International Application Number | N/A | ||||||||
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PCT Conventions:
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