Patent ID: 7611341

Claim:
A capacity varying rotary compressor, comprising: a casing that maintains a discharge pressure state; a motor installed in the casing and generating a driving force; and at least one cylinder assembly that includes: a rolling piston; a vane, wherein the rolling piston is eccentrically coupled to a rotation shaft of the motor such that the rolling piston performs an orbiting motion and the vane performs a linear motion relative to the rolling piston; a vane restricting device that restricts a position of the vane so as to separate the vane from the rolling piston, or so as to release the vane so that the vane contacts the rolling piston; and a vane chamber formed at a rear side of the vane, wherein the vane restricting device restricts or releases the vane based on a pressure differential applied to the vane in the vane chamber, and wherein a suction pressure is supplied to the vane chamber so as to separate the vane from the rolling piston, and wherein a high discharge pressure is applied to at least one of two opposite lateral side surfaces of the vane, or to a lower end surface of the vane, so as to restrict a position of the vane.