Control valve device for variable capacity compressors

Details Control valve device for variable capacity compressors Control valve device for variable capacity compressors

1990-01-29

1991-05-21

Koczo, Michael

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417310, F04B 4900

Patent

active

050170970

ABSTRACT:
A variable capacity compressor includes a control element for determining timing of start of compression of a refrigerant gas. Control pressure which prevails in a high-pressure chamber acts on the control element. The high-pressure chamber communicates with a suction chamber via a communicating passage, across which is arranged a control valve device for opening and closing the communicating passage to change the control pressure within the high-pressure chamber. The control valve device comprises a valve body, a spring urging the valve body in a closing direction, and a bellows expansible and contractible in direct response to suction pressure within the suction chamber for urging the valve body in an opening direction against the force of the spring when it is expanded. A high pressure-introducing passage has one end opening into a space within which discharge pressure prevails and another end facing the valve body, the discharge pressure from the space prevailing within the high pressure-introducing passage. A plunger is slidably fitted in the high pressure-introducing passage and projects out of the other end thereof. The plunger is responsive to the discharge pressure within the high pressure-introducing passage to urge the valve body in a closing direction.

REFERENCES:
patent: 4744732 (1988-05-01), Nakajima
patent: 4865524 (1989-09-01), Nakajima
patent: 4929156 (1990-05-01), Eitai

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