| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control valve for a variable displacement compressor, which is simple in construction and excellent in controllability. <P>SOLUTION: A main valve 20 and a solenoid valve 21 are disposed between a port 23 for introducing refrigerant at discharge pressure Pd1 delivered from a discharge chamber and a port 24 for allowing refrigerant at discharge pressure Pd2 to flow out at a controlled flow rate. The valve lift of the main valve 20 is varied according to the flow rate of refrigerant passing therethrough. The solenoid valve 21 uses a valve element 28 of the main valve 20 as a variable valve seat, and supplies, to a crankcase, the refrigerant at pressure Pc whose flow rate is controlled according to the size of a gap formed between the variable valve seat and a hollow cylindrical valve element 32. The main valve 20 not only senses the flow rate but also serves as the valve seat of the solenoid valve 21, and the solenoid valve 21 controls the small flow rate of refrigerant supplied to the crankcase. Therefore, the control valve has simple structure, and performs a stable flow rate control. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
