EP 1658438 A1 20060524 - LIQUID PUMP
Title (en)
LIQUID PUMP
Title (de)
FLÜSSIGKEITSPUMPE
Title (fr)
POMPE A LIQUIDES
Publication
Application
Priority
- DE 2004001719 W 20040730
- DE 10337849 A 20030818
Abstract (en)
[origin: WO2005017361A1] The invention relates to a liquid pump comprising a housing (10, 12) in which a pump chamber (14) is configured. Inside said pump chamber, at least one rotatingly driven delivery element (16, 18) is mounted and delivers liquid from a suction chamber (40) linked with a reservoir to a pressure chamber (42). The liquid pump is provided with a pressure control valve (50) for controlling the pressure inside the pressure chamber (42). Said control valve has a valve piston (60) disposed inside the housing (10, 12) which is impinged in the closing direction by a biased closing spring (62) an in the opening direction by the pressure prevailing in the pressure chamber (42). When the pressure inside the pressure chamber (42) exceeds a defined value, the valve piston releases a connecting channel (52) which links the pressure chamber (42) with the suction chamber (40). A filter (82) is mounted upstream of the liquid pump and/or a filter (83) is mounted downstream of the liquid pump. A pressure chamber (85) is provided in said filter and comprises a connection to an area downstream of the upstream filter (82) or a connection to an area downstream of the downstream filter (83). The pressure prevailing in the pressure chamber (85) influences the force acting upon on the valve piston (60) in the closing direction in such a manner that the force acting in the closing direction onto the valve piston (60) increases with decreasing pressure in the pressure chamber (85).
IPC 1-7
IPC 8 full level
F04C 15/00 (2006.01); F02M 37/00 (2006.01); F02M 37/04 (2006.01); F02M 37/32 (2019.01); F04C 14/26 (2006.01); F02M 37/54 (2019.01)
CPC (source: EP US)
F02M 37/0029 (2013.01 - EP US); F02M 37/0047 (2013.01 - EP US); F02M 37/041 (2013.01 - EP US); F02M 37/32 (2018.12 - EP US); F02M 37/44 (2018.12 - EP US); F04C 14/265 (2013.01 - EP US); F02M 37/54 (2018.12 - EP US)
Citation (search report)
See references of WO 2005017361A1
Designated contracting state (EPC)
DE GB IT
DOCDB simple family (publication)
WO 2005017361 A1 20050224; DE 10337849 A1 20050317; DE 502004006939 D1 20080605; EP 1658438 A1 20060524; EP 1658438 B1 20080423; JP 2006515042 A 20060518; JP 4164094 B2 20081008; US 2006228230 A1 20061012
DOCDB simple family (application)
DE 2004001719 W 20040730; DE 10337849 A 20030818; DE 502004006939 T 20040730; EP 04762564 A 20040730; JP 2005518302 A 20040730; US 56881206 A 20060221