ROTARY COMPRESSOR

摘要

A rotary compressor is provided with a motor portion (22) and a compression mechanism portion (21) within a hermetic housing (1). The compression mechanism portion (21) includes more than one cylinder (23). In the cylinder (23) is provided a cylinder compression chamber (24) in which a piston (28) is accommodated. A leading end of a vane is in contact with the periphery of the piston and divides the cylinder compression chamber into a high-pressure chamber (31a) and a low-pressure chamber (31b). A crankshaft (27) engages with the piston to drive it. A main bearing (25) and a secondary bearing (26) are used to support the crankshaft and are installed on the cylinder. The main bearing is connected with a main shaft (34a) of the crankshaft, and the secondary bearing (26) is connected with a secondary shaft (34b) of the crankshaft. In the position of at least one of two ends (36) of the piston adjacent to one's end face is provided a circumferential groove (37) opening toward the inside of the piston. A flexible thin wall (38) is provided on the outer side of the circumferential groove. The compressor can adjust the clearance forming between two ends and the main and secondary bearings, respectively, by the pressure difference between the inside and outside of the piston, and thereby reduces leakage loss and increases energy consumption.