Patent ID: 8714938

Claim:
A variable displacement compressor in which a suction-pressure region, a discharge-pressure region and a crank chamber are formed, wherein displacement of the variable displacement compressor varies in accordance with pressure in the crank chamber, the variable displacement compressor comprising: a supply passage for allowing refrigerant in the discharge-pressure region to be supplied into the crank chamber; a bleed passage for allowing the refrigerant in the crank chamber to be discharged to the suction-pressure region; a first control valve for adjusting a cross-sectional area of the supply passage; and a second control valve for adjusting a cross-sectional area of the bleed passage, the second control valve comprising: a valve hole for forming a part of the bleed passage, the valve hole being opened to the crank chamber; a valve chamber opened to the valve hole; a first valve portion disposed in the valve chamber for adjusting a cross-sectional area of the valve hole; a second valve portion disposed in the valve chamber for dividing the valve chamber into a bleed chamber, a backpressure chamber and a communication passage, the bleed chamber forming a part of the bleed passage, the backpressure chamber communicating with the supply passage, the communication passage being formed between an outer circumferential surface of the second valve portion and an inner circumferential surface of the valve chamber for providing fluid communication between the bleed chamber and the backpressure chamber; and a valve seat member disposed in the bleed chamber, the valve seat member being provided separately from a compressor housing forming the valve chamber, wherein when the second control valve is placed in a closed position, a restricted passage remains between one end surface of the second valve portion that is adjacent to the bleed chamber and the valve seat member for providing fluid communication between the bleed chamber and the backpressure chamber.