Filter/drier for reversible heat pump system

F - Mech Eng,Light,Heat,Weapons – 25 – B

Patent

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Details

F25B 43/00 (2006.01) B01D 53/04 (2006.01) B01D 53/26 (2006.01) B60H 1/22 (2006.01) B60H 1/32 (2006.01) F25B 30/00 (2006.01)

Patent

CA 2216808

A bi-directional filter/drier having a flat header welded to a casing with a desiccant canister disposed in the casing. The header has a dedicated low side pressure inlet port formed in the flat which communicates through a pair of oppositely disposed check valves in a cross passage with two separate bi-directional inlet/outlet ports into which low side pressure flow is permitted to by-pass the desiccant to the bi-directional ports. Individual passages, each with a stiffer check valve are provided between the bi-directional ports for permitting high side pressure to flow in either port into the desiccant. A stand pip through the desiccant is connected to an interior port in the header and communicates with a dedicated outlet port in header exterior.

Cette invention concerne un filtre-dessiccateur bidirectionnel équipé d'un collecteur plat soudé à une enveloppe dans laquelle est logée une cartouche de produit déshydratant. Le collecteur comporte un orifice d'entrée basse pression qui communique, via une paire de clapets de retenue opposés montés dans un passage transversal, avec deux orifices distincts d'entrée/sortie par lesquels le flux basse pression peut contourner la cartouche de déshydratant pour atteindre les orifices bidirectionnels. Des passages séparés comportant chacun un clapet de retenue de résistance plus élevée sont prévus entre les orifices bidirectionnels pour autoriser l'admission d'un flux haute pression dans la cartouche déshydratante. Une colonne montante traversant cette cartouche est raccordée à un orifice intérieur du collecteur et communique avec un orifice de sortie dédié du collecteur.

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