Patent ID: 7354259

Claim:
A scroll compressor comprising: an orbiting scroll; a non-orbiting scroll meshed with the orbiting scroll to form compression chambers; a discharge port for discharging fluid compressed by the orbiting scroll and the non-orbiting scroll; a discharge chamber into which the compressed fluid discharged from the discharge port flows; a back-pressure chamber provided at a back side of the orbiting scroll; a suction pressure region to lead fluid into the compression chambers formed by the orbiting scroll and non-orbiting scroll; a communication path communicating the back-pressure chamber with the suction pressure region; a bypass hole communicating a compression chamber, which is not communicated with the discharge port, with the discharge chamber; a control bypass valve for opening the bypass hole when pressure in the compression chamber, which is not communicated with the discharge port, becomes higher than discharge pressure in the discharge chamber; and a back-pressure control valve for opening the communication path when a pressure difference between pressure in the back-pressure chamber and suction pressure in the suction pressure region exceeds a predetermined value, wherein the back-pressure control valve comprises a valve spring for urging a valve body to set a valve opening value, the valve opening value being set lower than if the scroll compressor did not include a control bypass valve.