Patent ID: 9010138
Filing Date: 2015-04-21
Classification: F04B

Abstract:
1. A variable displacement compressor in which a suction pressure zone, a discharge pressure zone and a control pressure chamber are formed, wherein displacement of the variable displacement compressor varies in accordance with pressure in the control pressure chamber by supplying refrigerant in the discharge pressure zone to the control pressure chamber via a supply passage and releasing the refrigerant in the control pressure chamber to the suction pressure zone via a bleed passage, the variable displacement compressor comprising: a first control valve for adjusting the cross-sectional area of the supply passage; a suction restricting valve having a valve body and a back pressure chamber, wherein the valve body changes the cross-sectional area of a suction passage that extends from the external refrigerant circuit to the suction chamber, and the back pressure chamber is used for applying a back pressure to the valve body to act against the pressure in the suction passage; and a second control valve that adjusts the cross-sectional area of the bleed passage in accordance with the opening/closing state of the first control valve, wherein the second control valve adjusts the cross-sectional area of the bleed passage such that the cross-sectional area of the bleed passage when the first control valve is in the closed state is larger than that when the first control valve is in the opened state, and the back pressure chamber is located in a section of the bleed passage that is located between the second control valve and the control pressure chamber.