Control valve for variable displacement compressor

摘要

A variable displacement compressor includes a bleed passage (41) for releasing gas from a crank chamber (15) to a suction chamber (34) and a supply passage (42) for supplying gas from a discharge chamber (35) to the crank chamber (15). A control valve includes an outlet valve mechanism (V1) located in the bleed passage (41) and an inlet valve mechanism (V2) located in the supply passage (42). When the inlet valve mechanism (V2) is in the open state, the outlet valve mechanism (V1) is in the closed state. An outlet valve body (76) of the outlet valve mechanism (V1) has a communication passage (79). When the outlet valve mechanism (V1) is in the closed state, the communication passage (79) is opened to communicate the crank chamber (15) with the suction chamber (34). Therefore, when the compressor is operating at the minimum displacement, a gas circuit is positively formed within the compressor, and atomized lubricant in refrigerant gas positively lubricates the moving parts of the compressor.