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    • 90. 发明授权
    • Oil free screw compressor operating at variable speeds and control method therefor
    • 无油螺杆压缩机以可变速度运行及其控制方法
    • US06561766B2
    • 2003-05-13
    • US09819999
    • 2001-03-29
    • Hitoshi NishimuraHiroshi Ohta
    • Hitoshi NishimuraHiroshi Ohta
    • F04B4906
    • F04C28/24F04C23/001F04C28/06F04C28/08F04C2240/403
    • An oil free screw compressor includes a low-pressure stage compressor body and a high-pressure stage compressor body. Power of a motor driven by an inverter is transmitted to the compressor bodies through gears. A low-pressure stage blow-off two-way valve is provided in a pipe branching off midway an air pipe connecting between the high-pressure stage compressor body and the low-pressure stage compressor body, and a high-pressure stage blow-off two-way valve is provided in a pipe branching off from a discharge air pipe provided on a discharge side of the high-pressure stage compressor body. During no-load operation, a controller gives a command to the inverter to make the rotational speed of the motor a set lower limit rotational speed, and also gives an open command to the low-pressure stage blow-off two-way valve.
    • 无油螺杆压缩机包括低压级压缩机体和高压级压缩机体。 由变频器驱动的电动机的功率通过齿轮传递到压缩机主体。 在高压级压缩机体和低压级压缩机体连接的空气管的中途分支的管道中设置有低压级吹出式二通阀,以及高压级吹出 在设置在高压级压缩机主体的排出侧的排气管上分支的管中设置有双向阀。 在空载运转时,控制器向变频器发出指令,使电动机的转速设定下限转速,并向低压级排放二通阀提供开启指令。