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    • 5. 发明授权
    • Operation control system of rotary displacement type vacuum pump
    • 旋转式真空泵操作控制系统
    • US4664601A
    • 1987-05-12
    • US758032
    • 1985-07-23
    • Riichi UchidaKatsumi MatsubaraSeiji Tsuru
    • Riichi UchidaKatsumi MatsubaraSeiji Tsuru
    • F04C25/02F04B49/02F04C18/16F04C28/00F04C28/06F04C28/08
    • F04C28/08F04C28/06F04C2240/403
    • An operation control system of a rotary displacement type vacuum pump capable of reducing a starting torque of the vacuum pump includes a suction regulating valve and a pressure sensor for monitoring suction pressure located in a suction passage of the vacuum pump, an inverter electrically coupled to a variable speed electric motor for driving the vacuum pump and a control unit. The control unit is operative, when the vacuum pump is started, to keep the suction regulating valve in a closed position until the value of suction pressure monitored by the pressure sensor reaches a predetermined upper limit value and to gradually increase the rpm. of the variable speed electric motor. The control unit is further operative to produce a signal for increasing or decreasing the rpm of the variable speed electric motor so as to bring the value of suction pressure monitored by the pressure sensor to the vicinity of a predetermined lower limit value.
    • 能够减小真空泵起动转矩的旋转式真空泵的操作控制系统包括:吸入调节阀和用于监测位于真空泵吸入通道内的吸入压力的压力传感器;电耦合到 用于驱动真空泵的变速电动机和控制单元。 当真空泵启动时,控制单元可操作,以将吸入调节阀保持在关闭位置,直到由压力传感器监测的吸入压力值达到预定的上限值并逐渐增加转速。 的变速电动机。 控制单元进一步操作以产生用于增加或减小变速电动机的转速的信号,以使由压力传感器监测的吸入压力值接近预定的下限值。
    • 8. 发明授权
    • Screw compressor
    • 螺杆压缩机
    • US4234296A
    • 1980-11-18
    • US46025
    • 1979-06-06
    • Katsumi MatsubaraShigekazu NozawaMasaharu IshiiMitsuhiko Miyagawa
    • Katsumi MatsubaraShigekazu NozawaMasaharu IshiiMitsuhiko Miyagawa
    • F04C28/26F01C1/16F04C2/00F04C18/16F04C28/12
    • F04C28/125
    • A screw compressor including a male rotor and a female rotor forming a pair, a rotor casing enclosing the pair of rotors and cooperating therewith to define a working chamber for compressing gas, a suction port and a discharge port formed in a suction cover and a discharge cover respectively provided to the rotor casing, a slide valve mounted at one part of the rotor casing for axial movement to return gas from the working chamber to the suction side of the compressor, a radial discharge port formed in the slide valve, and an axial discharge port formed in the discharge cover and smaller in size than the radial discharge port. The slide valve is formed therein with at least one gas flow passageway for communicating the working chamber with the discharge port only when the compressor operates in a controlled capacity mode.
    • 一种螺杆式压缩机,其特征在于,包括:阳转子和形成一对的阴转子;转子壳体,其包围所述一对转子并与其配合配置以限定用于压缩气体的工作室,形成在吸入盖中的吸入口和排出口; 分别设置在转子壳体上的滑盖,安装在转子壳体的一部分的用于轴向移动以将气体从工作室返回到压缩机的吸入侧的滑阀,形成在滑阀中的径向排出口,以及轴向 排出口形成在排出盖中,并且尺寸小于径向排出口。 滑阀在其中形成有至少一个气流通道,用于仅当压缩机以受控容量模式运行时才将工作室与排出口连通。