CAPACITY CONTROL VALVE IN VARIABLE DISPLACEMENT COMPRESSOR

摘要

PROBLEM TO BE SOLVED: To avoid increase in the size of an electrically driven capacity control valve and complication in volume controlling, in a variable displacement compressor adopting high-pressure coolant such as CO2. SOLUTION: A capacity control valve 25 is composed of a solenoid 26 and a valve operating mechanism 27. A pressure sensing body 31 divides a pressure opposing chamber 30 into a first pressure chamber 301 and a second pressure chamber 302. When a valve element 29 is in an open state where a valve hole 282 is opened, high pressure coolant in a discharge chamber is fed to a control pressure chamber. The control pressure in the control pressure chamber influences on the first pressure chamber 301, while intake pressure in an intake chamber influences on the second pressure chamber 302. Driving force of the solenoid 26 resists pressure difference between the first pressure chamber 301 and the second pressure chamber 302. The driving force of the solenoid 26 is varied by current supply value to a coil 261.