Capacity control valve for variable displacement compressor

Details Capacity control valve for variable displacement compressor Capacity control valve for variable displacement compressor

2006-03-28

2006-03-28

Koczo, Jr., Michael (Department: 3746)

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

Reexamination Certificate

active

07018179

ABSTRACT:
The object of the present invention is to provide a capacity control valve for a variable displacement compressor, which is not adversely affected by pressure from a pressure-regulating chamber. A three-way valve structure is formed in which a high-pressure valve element and a low-pressure valve element are integrally formed at both ends, and valve seats with valve holes having the same diameter are arranged in a manner opposed to the respective valve elements. A discharges pressure is supplied from the upstream side of the valve seat, and a suction pressure is supplied from the downstream side of the valve seat. Pressures from a pressure-regulating chamber are received at the downstream side of the high-pressure valve element and the upstream side of the low-pressure valve element. Further, a solenoid is included for applying a load corresponding to a differential pressure at which the variable displacement compressor starts capacity control, to the high-pressure valve element and the low-pressure valve element, by a shaft via a valve hole of the valve seat. The valve holes are formed to have the same diameter, whereby it is possible to cancel out the pressures from the pressure-regulating chamber and perform capacity control only in response to the differential pressure between the discharge pressure a and the suction pressure.

REFERENCES:
patent: 6010312 (2000-01-01), Suitou et al.
patent: 6354811 (2002-03-01), Ota et al.
patent: 6361283 (2002-03-01), Ota et al.
patent: 6481976 (2002-11-01), Kimura et al.
patent: 6524077 (2003-02-01), Suitou et al.
patent: 6662581 (2003-12-01), Hirota et al.
patent: 61-286591 (1986-12-01), None
patent: 3-23385 (1991-01-01), None
Patent Abstracts of Japan, No. 2001-132650, dated May 18, 2001.

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