Patent ID: 6260369
Filing Date: 2001-07-17
Classification: F04B,F25B

Abstract:
A flow control valve for use with a variable displacement refrigerant compressor having a drive shaft rotationally driven by a drive source, a cylinder block provided with a cylinder bore allowing a piston to reciprocate therein to thereby compress a refrigerant sucked from a suction chamber and discharge the refrigerant after compression into a discharge chamber, a variable inclination cam plate arranged in a crank chamber to reciprocate the piston on the basis of the rotation of the drive shaft and to change a reciprocating stroke of the piston in response to an adjustable change in a crank chamber pressure prevailing in the crank chamber, and a controlling passage fluidly connecting the crank chamber to one of the discharge and suction chambers,wherein said flow control valve comprises:a pressure sensing member arranged to perform a movement upon sensing at least one of a suction pressure and a crank chamber pressure;a valve element operatively engaged with the pressure sensing member and to adjustably change an opening formed in a predetermined portion of said controlling passage in response to the movement of said pressure sensing member caused by the sensing of at least one of the suction and crank chamber pressures; andmeans for forming an arrangement wherein said pressure sensing member and said valve element have a flow controlling characteristics such that the suction pressure acting on said pressure sensing member increases in compliance with an increase in a discharge pressure prevailing in said discharge chamber.