Variable displacement refrigerant compressor having a control valve adapted to adjust an opening degree of a pressure supply passage and a switching valve in the pressure supply passage closer to a controlled pressure chamber than the control valve and switching between a first state and a second state

Abstract

A variable displacement compressor capable of preventing delay in pressure release of a controlled pressure chamber, such as a crank chamber. A switching valve () disposed downstream of a control valve of a pressure supply passage includes a main valve body () and a sub valve body (). The main valve body () includes an internal passage () providing communication between a first valve hole () communicating with a pressure supply passage () between the control valve and the switching valve (), and a second valve hole () communicating with a pressure supply passage () between the switching valve () and the crank chamber. The main valve body () provides communication between the second valve hole () and a pressure release hole () communicating with the suction chamber, when pressure Pm in the pressure supply passage () is lower than pressure Pc in the crank chamber. The sub valve body () closes the internal passage () of the main valve body (), when pressure Pm is lower than pressure Pc. The sub valve body () is lighter than the main valve body (), and thus, when pressure Pm decreases, the sub valve body () actuates before the main valve body (), to close the internal passage () of the main valve body ().