Variable capacity compressor

Details Variable capacity compressor Variable capacity compressor

1978-01-18

1979-11-13

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417269, F04B 112

Patent

active

041741919

ABSTRACT:
A controllable, variable displacement swash plate compressor including a centrally pivoted swash plate on a rotating shaft. Control means are provided to increase or decrease the angle of inclination of the swash plate in response to changes in suction pressure. The delivery from the compressor may be reduced rapidly from the maximum as the angle of inclination is reduced, due partly to the reduction in stroke, but mainly to the increased clearance volume, i.e. the volume above the piston in the cylinder, and the consequent re-expansion of the trapped gas in the clearance volume. This achieves a more efficient method of reducing compressor output to match system requirements than suction gas throttling, a commonly used technique in automotive air conditioning applications. In addition, it does not require a clutch since it may be run for prolonged periods at or near zero capacity (no-stroke condition) when cooling is not required.

REFERENCES:
patent: 3951569 (1976-04-01), Jacobs
patent: 4037993 (1977-07-01), Roberts
patent: 4061443 (1977-12-01), Black et al.

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