Patent ID: 8152502

Claim:
A scroll compressor comprising: a compression mechanism including a fixed scroll and an 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 a back surface of the orbiting scroll and the frame, wherein the frame has a step portion receiving the seal member so that the seal member faces to an outer peripheral surface of the step portion and the back surface to form the sealing between the back surface 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, a hermetically sealed container containing therein the compression mechanism, the drive mechanism and the frame, a guide ring supporting an end of the seal member opposite to an end thereof facing to the orbiting scroll, including a guide portion facing to the inner periphery of the seal member, and urging the seal member to be pressed against the back surface, and a spring between the frame and the guide ring so that the spring presses the seal member against the back surface through the guide ring.