Patent ID: 6234763
Filing Date: 2001-05-22
Classification: F04B

Abstract:
A variable displacement compressor that has a suction zone, a discharge zone, a crank chamber, a displacement control valve, and a displacement control passage, the displacement control passage being controlled by the displacement control valve to vary the pressure in the crank chamber, wherein the compressor compresses gas drawn from the suction zone and discharges the compressed gas to the discharge zone, wherein the displacement of the compressor varies according to the pressure of the crank chamber, the displacement control valve comprising:a valve chamber for forming part of the displacement control passage;a valve body located in the valve chamber to regulate an opening in the displacement control passage;a pressure sensing chamber connected to the discharge zone and an associated zone whose internal pressure is held at a pressure associated with a suction pressure of the suction zone wherein gas flows into the pressure sensing chamber from the discharge zone through an inlet passage and flows out of the pressure sensing chamber to the associated zone through an outlet passage;a pressure sensing mechanism located in the pressure sensing chamber, wherein the pressure sensing mechanism acts on the valve body to adjust the position of the valve body according to the pressure in the pressure sensing chamber; andan electromagnetic valve for regulating one of the inlet passage and the outlet passage to change the pressure of the pressure sensing chamber according to a determination based on external conditions.