Patent ID: 6371734
Filing Date: 2002-04-16
Classification: F04B

Abstract:
A control valve used for a variable displacement compressor in a refrigerant circuit, wherein the compressor includes a crank chamber, a discharge pressure zone, a suction pressure zone, a supply passage for connecting the discharge pressure zone to the crank chamber, and a bleed passage for connecting the suction pressure zone to the crank chamber, the control valve comprising:a valve housing; a valve chamber defined in the valve housing; a movable valve body located in the valve chamber to adjust opening size of the supply passage or the bleed passage; a pressure sensing chamber defined in the valve housing; a dividing member located in the sensing chamber to divide the pressure sensing chamber into a first pressure chamber and a second pressure chamber, wherein the pressure at a first pressure monitoring point located in the refrigerant circuit is applied to the first pressure chamber, and the pressure at a second pressure monitoring point located in the refrigerant circuit is applied to the second pressure chamber, wherein the dividing member moves in accordance with the pressure difference between the first pressure chamber and the second pressure chamber; a rod for transmitting the movement of the dividing member to the valve body, wherein the rod has a proximal end and a distal end, wherein the distal end is coupled to the dividing member, wherein the pressure of the crank chamber is changed in accordance with the movement of the dividing member and the valve body to control the displacement of the compressor, wherein the vicinity of the proximal end of the rod is exposed to the pressure of the first pressure chamber or the second pressure chamber; and an urging mechanism for urging the rod axially with a force that represents a target pressure difference between the two pressure monitoring points.