Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1991-03-27
1992-07-14
Bertsch, Richard A.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417310, 417222S, F04B 4900, F04B 126
Patent
active
051297914
ABSTRACT:
A variable capacity vane compressor has a control element for determining timing of start of compression of a refrigerant gas. In a high-pressure chamber there prevails control pressure which acts on the control element for urging same toward a maximum capacity position thereof. The control pressure is created by introducing the refrigerant gas from a discharging space within which discharge pressure prevails into the high-pressure chamber via a high pressure-introducing passageway. The high pressure-introducing passageway has a restriction hole for restricting flow of the refrigerant gas. An electromagnetic value opens and closes the restriction hole in response to an external control signal. The refrigerant gas is allowed to constantly leak from the high-pressure chamber into a suction chamber via a leak passage, the leak passage having a cross-sectional area smaller than that of the restriction hole.
REFERENCES:
patent: 4752189 (1988-06-01), Bearint et al.
patent: 4892466 (1990-01-01), Taguchi et al.
patent: 5017096 (1991-05-01), Sugiura et al.
patent: 5056990 (1991-10-01), Nakajima
Basichas Alfred
Bertsch Richard A.
Zexel Corporation
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