Patent ID: 7381038

Claim:
A capacity-changing unit of an orbiting vane compressor, the capacity-changing unit comprising: a cylinder having a refrigerant gas inlet port, a refrigerant gas outlet port, a cylinder suction hole which communicates with the refrigerant gas inlet port and the refrigerant gas outlet port of the cylinder, and a valve operation groove provided at a surface of the cylinder; a wrap of an orbiting vane configured to move orbitally within an operation space defined in the cylinder so as to compress refrigerant gas introduced into the cylinder; a subsidiary frame which supports an end of the cylinder; and a rotary valve plate positioned between the cylinder and the subsidiary frame, the rotary valve plate being configured to rotate relative to the cylinder so as to open and close a communication channel configured to selectively communicate with the cylinder suction hole, wherein the valve operation groove comprises: the cylinder suction hole, inner and outer outlet ports of the cylinder, and a ring shape having a connection part operation groove provided at a predetermined position of the outer circumferential part of the valve operation groove, the connection part operation groove communicating with the valve operation groove, and wherein the rotary valve plate has a shape the same as a shape of the valve operation groove, the communication channel being provided in the rotary valve plate and configured to allow communication between a communication inlet port and the cylinder suction hole, the rotary valve plate having inner and outer communication outlet ports, the inner communication outlet port being configured to communicate with the inner outlet port of the cylinder and the outer communication outlet port being configured to communicate with the outer outlet port of the cylinder, and the rotary valve plate being provided at the rear of the communication channel with inner and outer valve outlet ports, the inner valve outlet port being configured to communicate with the inner outlet port of the cylinder and the outer valve outlet port being configured to communicate with the outer outlet port of the cylinder, wherein the inner and outer valve outlet ports do not communicate with the communication channel.