Patent ID: 8821143
Filing Date: 2014-09-02
Classification: F01C,F04C,F05C

Abstract:
1. A vane rotary compressor comprising a compression element which sucks a refrigerant from a low-pressure space, compresses the refrigerant, and discharges the refrigerant to a high-pressure space, the compression element comprising a cylinder which has an internal space formed by a substantially cylindrical inner circumferential surface, a roller having a substantially cylindrical outer circumferential surface which is accommodated in the internal space and makes rotary motion in the internal space, a shaft which includes the roller and transfers a rotational force to the roller, two bearings which support the shaft and close opening portions of two ends of the internal space of the cylinder, a plate-like vane which is provided on the roller, is made to protrude from the outer circumferential surface of the roller to the inner circumferential surface of the cylinder, and partitions a space formed by the outer circumferential surface of the roller, the inner circumferential surface of the cylinder, and the bearings into a plurality of operating chambers, a suction hole which is provided in the cylinder and sucks a refrigerant from the low-pressure space to the operating chamber, a discharge hole which is provided in the cylinder and discharges the refrigerant from the operating chamber to the high-pressure space, a discharge flow channel to which the discharge hole is open and which is formed by the outer circumferential surface of the roller, the inner circumferential surface of the cylinder, and the bearings and communicates with the operating chamber, a discharge valve groove which is provided in the cylinder and has an opening portion in the inner circumferential surface of the cylinder which forms the discharge flow channel, a discharge valve back pressure flow channel which makes the discharge valve groove communicate with the high-pressure space and introduces a high-pressure refrigerant from the high-pressure space, and a discharge valve which is accommodated in the discharge valve groove so as to be reciprocally slidable, is pushed out from the opening portion of the discharge valve groove to the outer circumferential surface of the roller by the high-pressure refrigerant when a refrigerant pressure in the operating chamber is lower than a pressure of the high-pressure refrigerant, and is pushed back into the discharge valve groove by the refrigerant pressure in the operating chamber when the refrigerant pressure in the operating chamber is higher than the pressure of the high-pressure refrigerant, wherein the discharge flow channel is closed by the outer circumferential surface of the discharge valve pushed out from the opening portion of the discharge valve groove and the outer circumferential surface of the roller, and is opened when the discharge valve is pushed back to the discharge valve groove.