| 摘要 |
<p>A capacity control valve for a clutchless variable displacement swash plate-type compressor, in which the discharge capacity of the compressor is controlled by opening and closing a communication path between a discharge chamber and a crank chamber. The capacity control valve has a valve hole (106) formed in the communication path and always communicating with the discharge chamber, an inside control valve (100) for opening and closing the valve hole (106) by a valve body (112) operated in response to expansion and contraction of a pressure sensing member (109) for sensing a suction pressure, and an operation switchover device (120) connected to the inside control valve and switching the inside control valve between an operation state where the valve body opens and closes the valve hole in response to the expansion and contraction of the pressure sensing member and a non-operation state where the valve body opens the valve hole independent of the expansion and retraction of the pressure sensing member. In this capacity control valve, because a discharge pressure Pd acts on both the valve body (112) and a pressure sensing rod (110), that force of the discharge pressure Pd which urges the valve body (112) in a valve opening direction is (Sr - Sv)Pd. The capacity control valve (2) can be made smaller than conventional capacity control valves because (Sr - Sv) is very small.</p> |
