Patent ID: 6688853
Filing Date: 2004-02-10
Classification: F04B

Abstract:
A variable displacement compressor comprising:a compressor having a suction chamber, a crankcase chamber, and a discharge chamber wherein the crankcase chamber and discharge chamber are fluidly coupled by a valve for regulating the flow therebetween as a function of pressure in the suction chamber, the valve comprising: a valve housing having a chamber fluidly coupled to the suction chamber, the crankcase chamber, and the discharge chamber, a fluid flow regulation member disposed in the chamber configured to regulate fluid flow between the crankcase chamber and the discharge chamber, and a diaphragm disposed substantially perpendicular to a longitudinal axis of the chamber defining a volume between the diaphragm and an end of the chamber, and acting on the fluid flow regulation member as a function of the pressure in the suction chamber, the amount of longitudinal deflection of the diaphragm being responsive to the pressure in the suction chamber, wherein the volume contains a gas having an expansion characteristic different from an expansion characteristic of a fluid received from the suction chamber by the valve housing.