Control valve in variable displacement compressor

Details Control valve in variable displacement compressor Control valve in variable displacement compressor

1997-12-15

2000-05-16

Thorpe, Timothy S.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

25112902, 25112907, 25112915, F04B 126, F16K 3102

Patent

active

060628235

ABSTRACT:
A variable displacement compressor includes a gas passage for connecting a discharge chamber with a crank chamber. The control valve is located in the gas passage to control the pressure in the crank chamber. The control valve has a valve hole and a valve chamber located in the gas passage. A valve body is located in the valve chamber to adjust the opening size of the valve hole. A solenoid has a plunger and a plunger chamber for accommodating the plunger. A rod is located between the plunger and the valve body to transmit the movement of the plunger to the valve body. When the solenoid is de-excited, the bottom end face of the plunger abuts against the inner bottom wall of the plunger chamber. A plurality of grooves are provided on the bottom end face of the plunger and extend radially. The grooves define recessed passages between the bottom end face of the plunger and the inner bottom wall of the plunger chamber to prevent the bottom end face from adhering to the inner bottom wall. This prevents the plunger from sticking, and thus improves the response of the control valve.

REFERENCES:
patent: 4846630 (1989-07-01), Fujii et al.
patent: 4860549 (1989-08-01), Murayama
patent: 5145326 (1992-09-01), Kimura et al.
patent: 5282329 (1994-02-01), Teranishi
patent: 5584670 (1996-12-01), Kawaguchi et al.
patent: 5702235 (1997-12-01), Hirota et al.
patent: 5807076 (1998-09-01), Kawaguchi et al.

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