| 摘要 |
PURPOSE:To make compression capacity controllable into three stages with a large range, by making a dead space so as to be formable in a cylinder wall with slide wall material shifted as well as interconnecting this dead space to the suction side. CONSTITUTION:Closing a first solenoid valve 30 and, after once opening a second solenoid valve 32, when it is closed at once, back pressure in a slide wall material drops to some extent whereby the slide wall material moves by dint of a spring 16. As a result, an empty space 20 making up a dead space is produced in a base position of the slide wall material so that compression capacity is reduced. Next, when the second solenoid valve is opened, the said space 20 comes to be interconnected to the upstream side of an accumulator 27 at the suction side in succession whereby the compression capacity is yet more decreasable in consequence.
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