US 2006/0218953 A1Published application

Control valve for variable displacement compressor

AssigneeTgk Co., Ltd.

InventorHisatoshi Hirota

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Abstract

To enable a control valve for a variable displacement compressor, which operates by sensing a differential pressure between discharge pressure and suction pressure or between the discharge pressure and crankcase pressure, to enhance compression efficiency inside the compressor. In the control valve for a variable displacement compressor, according to the present invention, after a valve element on a high pressure side closes a valve hole, a valve element on a low pressure side opens a valve hole. Therefore, it is possible to eliminate a region in which both the valves on the high pressure side and the low pressure side are simultaneously open. This makes it possible to prevent refrigerant introduced into a crankcase from being immediately delivered, which makes it possible to obtain a sufficient compression efficient.

Claims22

Dependent claims

A control valve for a variable displacement compressor, which controls refrigerant displacement of the compressor by sensing a differential pressure between discharge pressure in a discharge chamber and suction pressure in a suction chamber or a differential pressure between the discharge pressure and crankcase pressure in a crankcase, comprising:

a first valve element that is fitted to and removed from a first valve hole communicating between the discharge chamber and the crankcase to thereby close and open the first valve hole;
a second valve element that is fitted to and removed from a second valve hole communicating between the crankcase and the suction chamber to thereby close and open the second valve hole;
and
a solenoid that is capable of applying a force in a valve-opening direction to said second valve element via a shaft, thereby making it possible to cause said first valve element and said second valve element to move either independently of or in unison with each other,
wherein after said first valve element closes the first valve hole, said second valve element opens the second valve hole.

2 more elements

a first valve that opens and closes a first valve hole communicating between the discharge chamber and the crankcase;
a second valve that opens and closes a second valve hole communicating between the crankcase and the suction chamber;
and
a solenoid that is capable of directly or indirectly applying a force in a valve-opening direction or a valve-closing direction to said first valve and said second valve via a shaft,
wherein after said first valve closes the first valve hole, said second valve opens the second valve hole.

2 more elements

Dependencies are inferred from the claim text.