| 摘要 |
<P>PROBLEM TO BE SOLVED: To dispense with a check valve in a refrigerant outlet port of a variable displacement compressor in a control valve for the variable displacement compressor for controlling the discharge flow rate of refrigerant to be constant. <P>SOLUTION: The control valve includes a first control valve 10A that controls the passage cross-sectional area of a refrigerant passage through which refrigerant passes from a discharge chamber of the variable displacement compressor to the refrigerant outlet port thereof, and a second control valve 10B that controls the flow rate of refrigerant allowed to flow from the discharge chamber to a crankcase such that a differential pressure (Pdh-Pdl) across the first control valve generated by the refrigerant passing therethrough becomes constant. The control valve is configured such that when a solenoid section 10C is not energized, a first valve element 18 is engaged with a piston 33 to forcibly fully open the second control valve 10B. The piston 33 has an outer diameter equal to the inner diameter of a first valve seat 17, so that the discharge pressure Pdl on the refrigerant outlet port side is inhibited from adversely affecting the fully-opening operation of the second control valve 10B, to thereby maintain the fully-closed state of the first control valve 10A. This makes it possible to dispense with a check valve conventionally provided in the refrigerant outlet port. <P>COPYRIGHT: (C)2007,JPO&INPIT |
