Patent ID: 7101161
Filing Date: 2006-09-05
Classification: F01C,F04C,F25B,Y10T

Abstract:
1. A multi-stage compression type rotary compressor comprising an electrical-power element and first and second rotary compression elements driven by this electrical-power element in a sealed vessel in such a configuration that a refrigerant gas compressed at the first rotary compression element is discharged into the sealed vessel and this discharged medium pressure refrigerant gas is compressed at the second rotary compression element, the multi-stage compression type rotary compressor further comprising a cylinder constituting the second rotary compression element, and a roller which is fitted to an eccentric portion formed on a rotary shaft of the electrical-power element to eccentrically revolve in the cylinder, a vane which butts against this roller to divide an inside of the cylinder into a low-pressure chamber side and a high-pressure chamber side, a back pressure chamber for always urging the vane on the roller side, a communication path which communicates a refrigerant discharge side of the second rotary compression element and the back pressure chamber to each other, and a pressure adjustment valve for adjusting a pressure applied to the back pressure chamber through the communication path to act on the vane.