# US 9,435,572 B2 · Bidirectional filter and heat pump system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,572 B2 - Document ID: US9435572B2 - Status: Granted - Kind: B2 - Application number: 14/235,428 - Filed: 2011-12-16 - Published: 2014-05-29 - Granted: 2016-09-06 - Earliest claimed: 2011-08-25 - Assignees: Zhejiang Sanhua Co., Ltd. - Applicants: Linping Wu; Feng Chen; Weiwei Jiang - Inventors: Linping Wu; Feng Chen; Weiwei Jiang - Web page: https://patentgrep.com/patent/US9435572B2 ## CPC - F25B 30/02: of the compression type - B01D 35/15: Bidirectional working filters - F25B 43/003: {Filters} - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract A bidirectional filter and a heat pump system. The bidirectional filter comprises a housing and at least two control value components. The two control value components divide the inner chamber of the housing into a filter chamber and two transitional chambers. The control value component comprises a frame body fixed on an inner wall of the housing, and an outlet blocking piece fitting an outlet of the frame body. The outlet blocking piece is on an outer side of the frame body. The bidirectional filter further comprises a protective member located in the filter chamber and fixed relative to the housing. The protective member is provided with a protective surface opposite to an outer side surface of the outlet blocking piece. When the pressure of a refrigerant in the pipeline is too high, the protective surface of the protective member can limit movement of the outlet blocking piece. ## Claims ### Claim 1 A bidirectional filter, comprising a housing and at least two control valve components, two of the control valve components dividing an inner chamber of the housing into a filter chamber and two transitional chambers, each of the control valve components comprising a frame body fixed to an inner wall of the housing and an outlet blocking piece cooperating with an outlet of the frame body, the outlet blocking piece being located at an outer side of the frame body, wherein, the bidirectional filter further comprises a protective member located in each of the transitional chambers and fixed with respect to the housing, and the protective member has a protective surface opposite to an outer side surface of the outlet blocking piece; and wherein the protective member comprises a protective rod and a protective piece, the protective rod has a root end connected to the inner wall of the housing and a terminal end protruding towards the outlet blocking piece, the protective piece is connected to the terminal end of the protective rod, and the protective surface is formed on the protective piece. ### Claim 2 (depends on 1) The bidirectional filter according to claim 1, wherein the protective member comprises a plurality of protective rods, the protective piece is an annular plate, and the terminal end of each of the protective rods is connected to the annular plate. ### Claim 3 (depends on 2) The bidirectional filter according to claim 2, wherein the plurality of protective rods are uniformly distributed around a central line of the outlet. ### Claim 4 (depends on 2) The bidirectional filter according to claim 2, wherein the annular plate forms an annular protective surface opposite to a periphery of the outer side surface of the outlet blocking piece. ### Claim 5 (depends on 1) The bidirectional filter according to claim 1, wherein in a free state, a distance between the protective surface and the outer side surface of the outlet blocking piece is ranged from 3 mm to 20 mm. ### Claim 6 (depends on 5) The bidirectional filter according to claim 5, wherein the housing comprises a main body and a protective mounting plate, the protective mounting plate is mounted at an inner side of the main body via adjustment threads, and the protective member is connected to the protective mounting plate. ### Claim 7 (depends on 1) The bidirectional filter according to claim 1, wherein the housing comprises a main body and a protective mounting plate, the protective mounting plate is mounted at an inner side of the main body via adjustment threads, and the protective member is connected to the protective mounting plate. ### Claim 8 (depends on 1) A hot pump system, comprising an outdoor heat-exchanging system, a heat pump unit and an indoor air conditioner terminal system which are connected to each other by pipelines, and further comprising a bidirectional filter connected in the pipelines, wherein the bidirectional filter is the bidirectional filter according to claim 1. ### Claim 9 A bidirectional filter, comprising a housing and at least two control valve components, two of the control valve components dividing an inner chamber of the housing into a filter chamber and two transitional chambers, each of the control valve components comprising a frame body fixed to an inner wall of the housing and an outlet blocking piece cooperating with an outlet of the frame body, the outlet blocking piece being located at an outer side of the frame body, wherein, the bidirectional filter further comprises a protective member located in each of the transitional chambers and fixed with respect to the housing, and the protective member has a protective surface opposite to an outer side surface of the outlet blocking piece; the protective member comprises a protective rod and a protective piece, the protective rod has a root end connected to the frame body and a terminal end protruding outwards, the protective piece is connected to the terminal end of the terminal rod, and the protective surface is formed on the protective piece; and wherein the protective member comprises a plurality of protective rods, the protective piece is an annular plate, and the terminal end of each of the protective rods is connected to the annular plate. ### Claim 10 (depends on 9) The bidirectional filter according to claim 9, wherein the plurality of protective rods are uniformly distributed around a central line of the outlet. ### Claim 11 (depends on 9) The bidirectional filter according to claim 9, wherein the annular plate forms an annular protective surface opposite to a periphery of the outer side surface of the outlet blocking piece. ### Claim 12 (depends on 9) The bidirectional filter according to claim 9, wherein in a free state, a distance between the protective surface and the outer side surface of the outlet blocking piece is ranged from 3 mm to 20 mm. ### Claim 13 (depends on 9) A hot pump system, comprising an outdoor heat-exchanging system, a heat pump unit and an indoor air conditioner terminal system which are connected to each other by pipelines, and further comprising a bidirectional filter connected in the pipelines, wherein the bidirectional filter is the bidirectional filter according to claim 9.