Control valve

Details Control valve Control valve

1999-04-26

2000-05-16

Freay, Charles G.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

25112902, 25112915, F04B 126

Patent

active

060628243

ABSTRACT:
A displacement control valve included in a variable displacement compressor. The compressor includes a fluid passage for connecting a crank chamber to a discharge chamber. The control valve includes a valve chamber connected to the crank chamber through the fluid passage, a valve hole connected to the discharge chamber through the fluid passage, and a valve body located in the valve chamber. A bellows influences the valve body through a pressure sensitive rod in accordance with suction pressure. A solenoid includes a fixed iron core and a plunger arranged in a plunger chamber. The plunger urges the valve body through a solenoid rod by a force determined by the level of electric current supplied to the solenoid. The fixed iron core, which is located between the valve chamber and the plunger chamber, includes a guide hole for receiving the solenoid rod. An annular passage for connecting the valve chamber to the plunger chamber is formed between the guide hole and the solenoid rod. Accordingly, the pressure of the crank chamber is applied to the plunger chamber through the valve chamber and the annular passage. In this control valve, the valve body has desirable operating characteristics without relying on parts having precise dimensions.

REFERENCES:
patent: 5145326 (1992-09-01), Kimura et al.
patent: 5584670 (1996-12-01), Kawaguchi et al.
patent: 5702235 (1997-12-01), Hirota et al.
patent: 5890876 (1999-04-01), Suito et al.
patent: 5964578 (1999-10-01), Suito et al.

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