Multicylinder rotary compressor

Pumps – Expansible chamber type – Having separate noncyclic valve

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Details

417286, 417295, 417410, 418 60, 418 84, 418100, F04B 4100, F04B 4900, F04C 2300, F04C 2908

Patent

active

047800674

ABSTRACT:
A multicylinder rotary compressor has a plurality of cylinders housing rolling pistons which are rotated inside the cylinders by a common crankshaft. Each cylinder has a separate suction pipe. At least one of the suction pipes has a check valve which may be closed to unload the cylinder to which the suction pipe is connected. The check valve has a housing and a slider which can slide inside the housing between an open position and a closed position. The check valve may be closed by introduction of high-pressure refrigerant gas into the space beneath the slider to push it to the closed position when a cylinder is to be unloaded. In another form of the invention, the check valve is closed by a spring made of a shape-memory alloy and a heater for heating the spring above a prescribed temperature at which the allow changes shape. When a cylinder is to be unloaded, the heater is turned on, and the shape-memory alloy deforms into a shape such as to force the slide to the closed position. Lubricating oil may be provided to an unloaded cylinder.

REFERENCES:
patent: 2286272 (1942-06-01), Higham
patent: 2350537 (1944-06-01), Scott
patent: 2991002 (1961-07-01), Quertier
patent: 3407746 (1968-10-01), Johnson
patent: 3796515 (1974-03-01), Lindqvist et al.
patent: 4343599 (1982-08-01), Kowsokabe
patent: 4452570 (1984-06-01), Fujisaki et al.
patent: 4580949 (1986-04-01), Maruyama et al.
patent: 4636148 (1987-01-01), Takao et al.
patent: 4642034 (1987-02-01), Terauchi

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