Importance

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Abstract

A control valve of a variable displacement compressor capable of preventing a decrease in control accuracy is provided. In a control valve 300, a valve chamber 321b accommodating a valve body 322 constitutes a part of a pressure supply passage for supplying refrigerant in a discharge chamber to a crank chamber, or constitutes a part of a pressure relief passage through which refrigerant in the crank chamber flows toward a suction chamber, depending on whether the valve hole 321c is open or closed by a valve portion 322a of the valve body 322. A partition portion 322b having a larger diameter than that of the valve portion 322a of the valve body 322, partitions the valve chamber 321b into a first pressure application chamber 321b1 on which the pressure in the suction chamber mainly acts, and a second pressure application chamber 321b2 on which the pressure in the crank chamber mainly acts and into which refrigerant in the discharge chamber flows when the valve hole 321c is open. A clearance between an outer peripheral surface of the partition portion 322b and an inner peripheral surface of the valve chamber 321b forms a fixed orifice of the pressure relief passage. The second pressure application chamber 321b2 is formed to have a larger inner diameter than that of the inner peripheral surface of the valve chamber 321b.

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First Claim