Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1987-12-11
1988-10-11
Freeh, William L.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417310, F04B 4900, F04B 4902, F04C 2908
Patent
active
047767707
ABSTRACT:
A variable capacity vane compressor in which one of front and rear side blocks has at least one inlet port divided into first and second portions, and a control element has at least one pressure-receiving protuberance dividing a space formed in the one side block into first and second pressure chambers, wherein the control element angularly moves in response to a differential pressure between the first and second pressure chambers, to vary the opening angle of the second portion of the at least one inlet port. A torsion coiled spring is fitted around a hub of the one side block for biasing the control element in a circumferential direction of increasing the opening angle of the second portion of the inlet port. The torsion coiled spring has an end thereof provided with a first engaging portion engaging a first retaining device provided in the control element, and another end thereof provided with a second engaging portion engaging a second retaining device provided in the hub, through a holding device. The second engaging portion of the spring comprises a first portion and a second portion extending at a predetermined angle with respect to the first portion and forming a tip, thus presenting a bent portion together with the first portion. The second retaining device of the hub comprises a first retaining portion engaging the first portion of the second engaging portion of the spring, and a second retaining portion extending at a predetermined angle with respect to the first retaining portion and engaging the second portion of the second engaging portion of the spring.
REFERENCES:
patent: 3185105 (1965-05-01), Headings et al.
patent: 4726740 (1988-02-01), Suzuki
Eitai Kazuo
Inomata Kenichi
Moruta Masaya
Nakajima Nobuyuki
Okada Shigeru
Diesel Kiki Co. Ltd.
Freeh William L.
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