A compressor.

摘要

A compressor adapted for capacity control includes a rotor (16) mounting thereon vanes (14) slidably, a cylinder (11) receiving therein in the rotor (16) and the vanes (14). side plates secured to the opposite sides of the cylinder, a vane chamber (12,13) defined by the vane (14). rotor (16) and the cylinder (11) and closed at its sides by the side plates, suction ports (17) and a discharge port (19). Suction loss produced when the pressure within the vane chamber becomes below the pressure of the refrigerant supply source during suction stroke is utilized for suppressing the refrigerating capacity of the compressor at high speed operation. With the arrangement of the compressor, the effective area of the flow passage leading to the vane chamber from the suction ports varies in at least two stages such that it becomes smaller in the latter half of suction stroke than in the former half thereof. Thus. in the compressor, driving torque can be reduced at low speed operation and adequate effects of capacity control can be obtained at high speed operation.