| 摘要 |
<p>PURPOSE:To secure the degree of freedom in control by controlling the pressure in an intermediate chamber to an arbitrary pressure between the internal pressure of a discharge chamber and the internal pressure in a suction chamber by opening/closing- controlling the second controller and shifting the valve opening/closing operation point of the first controller according to the pressure in the intermediate chamber. CONSTITUTION:An intermediate chamber 16 communicates to a discharge chamber 15 through an orifice 60 formed in a communication passage 210, and communicates to a suction chamber 14 through a communication passage 220 and an electromagnetic flow-rate control valve (second controller) 70. The control valve 70 is in opening during electric conduction, and the valve opening area is set so that the discharge gas flows into the suction chamber 14 from the intermediate chamber 16, with equal flow-rate to the max. discharge gas introducing quantity which flows into the intermediate chamber 16 through the orifice 60 from the discharge chamber 15. Therefore, the intermediate chamber 16 can be set to an arbitrary pressure from the discharge chamber pressure to the suction chamber pressure by controlling the time ratio between the electric conduction time and the electric nonconduction time of the control valve 70 and controlling the substantial valve opening degree of the control valve 70.</p> |
