Patent ID: 8740594

Claim:
A scroll compressor comprising a compression mechanism including a fixed scroll and an orbiting scroll having a front surface from which an involute wrap projects and a back surface opposed to the front surface in an axial direction of the orbiting scroll, a drive mechanism including a motor and a crankshaft to drive the orbiting scroll, a frame for supporting the crankshaft in a rotatable manner, a seal member forming an annular sealing between the back surface of the orbiting scroll and the frame, a back pressure chamber defined at least partially by the back surface and an inner periphery of the seal member so that a pressure of discharged fluid is applied to the back pressure chamber, another back pressure chamber defined at least partially by the back surface and an outer periphery of the seal member so that another pressure lower than the pressure is applied to the another back pressure chamber to press the orbiting scroll against the fixed scroll with the pressure of the back pressure chamber and the another pressure of the another back pressure chamber, and a hermetically sealed container containing therein the compression mechanism, the drive mechanism and the frame, wherein the scroll compressor further comprises a guide ring supporting an end of the seal member opposite to an end thereof facing to the orbiting scroll, including a guide portion arranged between the inner periphery of the seal member and the crankshaft to face to the inner periphery of the seal member to support the seal member, and urging the seal member to be pressed against the back surface.