| 摘要 |
PURPOSE:To make wide-range, continuous delivery change possible by controlling a bypass hole by moving a control valve by using differential pressures between inside pressures of a high pressure introduction pipe arranged on the side of a slider in the direction of the rotation of a rotor and inside pressure of a low pressure introduction pipe arranged on the side of the slider opposite to the direction of the rotation of the rotor. CONSTITUTION:When delivery pressure increases and suction pressure decreases after continued delivery, a control valve 13 arranged in the middle of a high pressure introduction pipe 11a comes to open condition due to a differential pressure between an inside pressure of the high pressure introduction pipe for introducing high pressures of a compressor to a space 11 located on the side of rotary direction of a rotor and an inside pressure of a low pressure introduction pipe 12a for introducing pressures on the low pressure side to a space 12 located on the side opposite to rotary direction of the rotor. Accordingly, a slider 10 receives a rotary drive force due to a pressure differential between front and back of the slider and a side plate 5 starts moving in the direction opposite to the rotation of the rotor 2. This makes a span of a bypass 6 shorter and the operation with a larger delivery. Then, when the control valve 13 is closed on the contrary, drive force exerted on the slider 10 decreases to rotate the side plate 5 slowly in the same direction with the rotor 2, to reduce delivery and to make it possible to move on to smaller delivery.
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