| 摘要 |
PURPOSE:To always obtain the optimum capacity of a compression operating chamber by using an electrically controllable throttle valve mechanism as an oil pressure force regulating means and changing an oil pressure force at the time of changing the capacity of said compression operating chamber in accordance with an operating condition by rotating a control plate. CONSTITUTION:When a compressor body is out of operation, since the suction pressure in a suction chamber 23 is the same pressure as the oil pressure force in a space part 33 on the rear end side of a driving shaft 31, the driving shaft 31 is pressed by a spring 32 and positioned at the rearmost end part, minimizing the capacity of a compression operating chamber. On the other hand, as the gas compressor is started, since the oil pressure force on the rear end side of the driving shaft 31 rises, the oil pressure force becomes larger than the combined pressure of the spring 32 and the suction pressure of the suction chamber 23. As a result, the driving shaft 31 is advanced against the spring 32 rotating a control plate, to maximize the capacity of the compression operating chamber. At this time, a throttle valve mechanism 40 is operated allowing a lubricating oil in the space part 33 to escape to a low pressure side via passages 41, 46, 47, to regulate the oil pressure force.
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