Variable capacity vane compressor

Details Variable capacity vane compressor Variable capacity vane compressor

1990-03-22

1991-09-17

Nilson, Robert G.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417310, F04B 4900

Patent

active

050490435

ABSTRACT:
A variable capacity vane compressor in which one end face of a side block facing the rotor is formed therein with an annular recess in a bottom of which is formed a second recess. A control element rotatably received in the annular recess for varying the timing of commencement of the compressor. The control element cooperates with the second recess to define therebetween a pressure working space. The control element has a pressure-receiving protuberance slidably fitted in the pressure working space to divide same into a first pressure chamber and a second pressure chamber. A communication passage extends between the first pressure chamber and a low pressure zone. A control valve device is arranged in the communication passage for opening and closing the communication passage in response to suction pressure. A sealing device is provided in the bottom of the annular recess and engages portions of the control element other than the pressure-receiving protuberance. A high pressure-introducing passage introduces high pressure into the first pressure chamber. A restriction passage introduces high pressure into the second pressure chamber. The high pressure-introducing passage has a cross-sectional area larger than the cross-sectional area of the restriction passage. The inner wall of the pressure working space and the pressure-receiving portion defines therebetween a clearance smaller than the cross-sectional area of the restriction passage.

REFERENCES:
patent: 4774731 (1988-05-01), Nakajima et al.
patent: 4917578 (1990-04-01), Nakajima et al.

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