Pumps – Expansible chamber type – Having separate noncyclic valve
Patent
1987-09-28
1988-10-25
Croyle, Carlton R.
Pumps
Expansible chamber type
Having separate noncyclic valve
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.
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Kawasaki Katsuyuki
Nagashima Hiroyuki
Ogawa Hiroshi
Sakaino Keiju
Shirafuji Yoshinori
Croyle Carlton R.
Mitsubishi Denki & Kabushiki Kaisha
Neils Paul F.
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