US 2020/0057458 A1Published application

Control valve for variable displacement compressor

AssigneeSanden Automotive Components Corporation

InventorYukihiko TAGUCHI

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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.

A control valve for a variable displacement compressor, for use to adjust a pressure in a controlled pressure chamber in the variable displacement compressor that includes a suction chamber into which a refrigerant before being compressed is introduced, a compression section that draws and compresses the refrigerant in the suction chamber, a discharge chamber into which the compressed refrigerant compressed by the compression section is discharged, and the controlled pressure chamber, in which a state of the compression section changes in accordance with a pressure in the controlled pressure chamber to change a discharge displacement,

the control valve comprising:
a valve body having a valve portion that adjusts an opening degree of a valve hole constituting a part of a pressure supply passage for supplying the refrigerant in the discharge chamber to the controlled pressure chamber;
and
a valve chamber that accommodates the valve body, the valve chamber consisting a part of a pressure relief passage through which the refrigerant in the controlled pressure chamber flows toward the suction chamber when the valve portion of the valve body closes the valve hole, and consisting a part of the pressure supply passage when the valve portion of the valve body opens the valve hole,
wherein the valve body further has a partition portion having a larger diameter than that of the valve portion and partitioning the valve chamber into a first pressure application chamber on which a pressure in the suction chamber mainly acts, and a second pressure application chamber on which the pressure in the controlled pressure chamber mainly acts and into which the refrigerant in the discharge chamber flows when the valve portion of the valve body opens the valve hole,
wherein a clearance constituting a fixed orifice of the pressure relief passage is formed between an outer peripheral surface of the partition portion of the valve body and an inner peripheral surface of the valve chamber facing the outer peripheral surface,
wherein the second pressure application chamber is formed to have a larger inner diameter than that of the inner peripheral surface of the valve chamber facing the outer peripheral surface of the partition portion of the valve body.

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Abstract

Claims20