Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1989-08-21
1991-06-04
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417310, F04B 4908
Patent
active
050209752
ABSTRACT:
In a variable-delivery vane-type rotary compressor, a rotational displacement of an adjust member relative to a front member fixedly closing a front end of a cam ring varies a compression starting point of a rotary vane in a working chamber formed in the cam ring. The rotational displacement of the adjust member is controlled by an adjust member actuating unit in response to a pilot pressure applied to the adjust member actuating unit from a pilot pressure applying unit. The pilot pressure applying unit includes a first passage communicating the adjust member actuating unit with a valve unit, a second passage communicating an induction chamber with the valve unit, and a third passage communicating a discharge chamber with the valve unit. The valve unit, when it is most displaced in a first direction, fully blocks the communication between the adjust member actuating unit and the induction chamber through the first and second passages while allowing the communication between the adjust member actuating unit and the discharge chamber through the first and third passages for applying a pressure within the discharge chamber to the adjust member actuating unit as the pilot pressure. On the other hand, the valve unit, when it is most displaced in a second direction opposite to the first direction, fully opens the communication between the adjust member actuating unit and the induction chamber through the first and second passages for applying a pressure within the induction chamber to the adjust member actuating unit as the pilot pressure.
REFERENCES:
patent: 4813854 (1989-03-01), Nakajima
patent: 4865524 (1989-09-01), Nakajima
patent: 4892466 (1990-01-01), Taguchi
Atsugi Motor Parts Company Limited
Savio, III John A.
Smith Leonard E.
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