Pumps – Expansible chamber type – Having separate noncyclic valve
Patent
1977-11-07
1979-01-30
Vrablik, John J.
Pumps
Expansible chamber type
Having separate noncyclic valve
418 47, 418 78, 418238, F04B 4100, F04B 4902, F01C 2114, F04C 1700
Patent
active
041370180
ABSTRACT:
A reciprocating vane rotary compressor for an automotive air conditioning system wherein the compressor capacity may be varied in response to the evaporator pressure or temperature such that the evaporator pumps only the amount of refrigerant required at moderate ambient temperatures. The compressor has a circumferentially adjustable modulation ring mounted in concentric relation with the internal compressor chamber surface. The ring, having by-pass port means, may be advanced in the direction of rotation of the rotor, with the port means operative to delay the time that the chamber goes under compression. By varying the induction cut-off point of the ring by-pass port means, the compressor chamber undergoing pre-compression returns gas via a suction transfer passage in the housing to the compressor suction cavity. The compressor rotor is mounted on a unique overhanging stub shaft arrangement to provide a simplified single journal bearing location for the rotor.
REFERENCES:
patent: 2899903 (1959-08-01), Ryder
patent: 3120814 (1964-02-01), Mueller
patent: 3451614 (1969-06-01), Tosh
patent: 3515496 (1970-06-01), Eddy
patent: 3565558 (1971-02-01), Tobacman
patent: 3799707 (1974-03-01), Newton
patent: 4060343 (1977-11-01), Newton
Barthel Edward P.
General Motors Corporation
Vrablik John J.
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