초록 ▼

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

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.

대표청구항 ▼

A multicylinder rotary compressor for a cooling apparatus comprising: a plurality of cylinders which are disposed in parallel with one another; a crankshaft which extends through said cylinders and which has a plurality of eccentric cylindrical lobes formed thereon, each of said eccentric cylindrica

A multicylinder rotary compressor for a cooling apparatus comprising: a plurality of cylinders which are disposed in parallel with one another; a crankshaft which extends through said cylinders and which has a plurality of eccentric cylindrical lobes formed thereon, each of said eccentric cylindrical lobes being disposed inside one of said cylinders; a plurality of rolling pistons, each of which loosely fits on one of said eccentric cylindrical lobes so as to rotate thereon and is in rolling contact with the inner surface of one of said cylinders; an electric motor to which said crankshaft is connected so as to be rotatable thereby; a plurality of reciprocating vanes, each of which is slidably disposed inside the wall of one of said cylinders with one end in sliding contact with the outer surface of one of said rolling pistons, each vane dividing the inside of the cylinder in which it is disposed into a suction chamber and a compression chamber; a plurality of suction pipes, each of which opens onto the inside of the suction chamber of one of said cylinders; a check valve which is connected to one of said suction pipes and divides it into an upstream portion and a downstream portion which opens onto the inside of the suction chamber of one of said cylinders; means for biasing said check valve to a closed condition with such force as to close said valve when the compressor is not running and allow said valve to open in response to suction pressure when said compressor is running; and means for closing said check valve against the suction of the cylinder to which said downstream portion is connected while the compressor is running to unload said cylinder and reduce the capacity of the compressor.