| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress occurrence of pressure pulsation when a differential pressure regulating valve for controlling a flow of a discharge refrigerant from a variable displacement compressor is opened/closed. <P>SOLUTION: The differential pressure regulating valve 7 has a guide part 80 for supporting a first valve element 61 on the side opposite a valve hole 69 slidably in the opening/closing direction, and for forming a closed pressure chamber 81 between the first valve element 61 and the guide part 80. A communication hole 86 for communicating the inside with the outside is formed in the guide part 80. When the first valve element 61 is closed, a second valve element 62 seals the communication hole 86. At this time, although the volume of the pressure chamber 81 is expanded due to the closing operation of the first valve element 61, since inflow of a refrigerant via the communication hole 86 is prevented, the inside of the pressure chamber 81 becomes a negative pressure state, which causes valve closing resistance of the first valve element 61. Since a refrigerant is gradually made to flow in via a clearance of a sliding part between the first valve element 61 and the guide part 80, the valve closing operation itself of the first valve element 61 is secured, and the first valve element 61 is slowly operated to become a closing state. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
