Variable capacity compressor

Details Variable capacity compressor Variable capacity compressor

1989-03-20

1990-04-17

Smith, Leonard E.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417310, F04B 4900, F04C 2908

Patent

active

049175785

ABSTRACT:
A variable capacity compressor has a control element rotatably arranged within a cylinder, which has two pressure-receiving portions slidably received, respectively, in first and second pressure working chambers formed in the cylinder such that the first pressure working chamber is divided into a first lower-pressure chamber and a first higher-pressure chamber, and the second pressure working chamber into a second lower-pressure chamber and a second higher-pressure chamber. The first and second lower-pressure chambers are supplied with low pressure. A first passage extends between one of the first and second higher-pressure chambers and a compression space for supplying the former with discharge pressure from the latter. A second passage communicates between the first and second higher-pressure chambers. A control valve device is operable in response to suction pressure in the compressor for controlling pressure within the first and second higher-pressure chambers. The control element is rotated in response to change in the difference between pressure within the first and second lower pressure chambers and pressure within the first and second higher-pressure chambers for varying the capacity of the compressor. The compressor includes a third passage extending between the above one of the first and second higher-pressure chambers and a zone under low pressure within the compressor for leaking pressure from the former into the latter. The control valve device is disposed to open and close the third passage in response to the suction pressure.

REFERENCES:
patent: 4744732 (1988-05-01), Nakajima et al.
patent: 4813854 (1989-03-01), Nakajima

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