Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1985-08-13
1988-02-23
Freeh, William L.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417292, 417298, 417310, F04B 4900, F04B 4902
Patent
active
047267402
ABSTRACT:
A variable-delivery compressor having plural compression chambers whose volume is changed as a rotor is rotated in a housing to compress a gas sucked through a suction port and deliver the compressed gas through a discharge port, comprising: a by-pass passage for communication between a compressing and a sucking compression chamber of the plural compression chambers; a device for changing the position of the discharge-side extremity of an opening of the by-pass passage on the side of the compressing compression chamber, in the circumferential direction of the rotor, to retard the compression start timing of the compressing compression chamber; and at least one of a variable flow restrictor device associated with a suction passage communicating with the suction port to adjust a flow of the gas which is sucked through the suction passage, and a pressure relief device including a pressure relief passage and a switching device for closing and opening the pressure relief device. The pressure relief passage is normally closed by the switching device, but opened by the switching device to permit the compressing compression chamber to communicate with the suction chamber when the discharge-side extremity of the opening of the by-pass passage is shifted in the rotating direction of the rotor to a position nearest to the discharge port.
REFERENCES:
patent: 3120814 (1964-02-01), Mueller
patent: 3224662 (1965-12-01), Oldberg
patent: 3451614 (1969-06-01), Tosh
patent: 4060343 (1977-11-01), Newton
patent: 4065229 (1977-12-01), Black
patent: 4137018 (1979-01-01), Brucken
patent: 4272227 (1981-06-01), Woodruff
patent: 4558993 (1985-12-01), Hori et al.
Inagaki Mitsukane
Suzuki Shigeru
Suzuki Shin'ichi
Watanabe Yasushi
Freeh William L.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
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