| 摘要 |
PROBLEM TO BE SOLVED: To reduce generation of a power in the low load region of a screw compressor and to prevent generation of drain in an oil separator due to repetition of frequent starting and stop. SOLUTION: In an operation method of a screw compressor capable of speed change operation driven by a motor using an inverter, rotation speed control operation coping with change of load by changing rotation speed of a compressor and no load operation establishing rotation speed of the compressor to a lower limit rotation sped used in a rotation speed control operation and reducing delivery pressure by discharging compressed air delivered from the screw compressor to atmospheric air are provided. Under a load condition lighter than predetermined load, loaded operation and no load operation establishing rotation speed control operation are repeated. COPYRIGHT: (C)2007,JPO&INPIT
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