CAPACITY CONTROL DEVICE AND CAPACITY CONTROL METHOD FOR SCREW COMPRESSOR

摘要

PROBLEM TO BE SOLVED: To provide a capacity control device for a screw compressor capable of inhibiting exhaustion of components such as a suction throttle valve and extending lifetime thereof.;SOLUTION: In the capacity control device for the screw compressor controlling the suction throttle valve by control pressure changing over the load operation condition to the low pressure operation and recovery pressure changing over low pressure operation to load operation, a pressure detector 15 detecting delivery pressure of the compressor 1, and a control means 16 operating a cycle time of the load operation and the low pressure operation based on measured pressures detected by the pressure detector 15 and changing the control pressure to high pressure side if the cycle time is the shortest cycle defined based on predetermined lifetime of each component or less are provided.;COPYRIGHT: (C)2007,JPO&INPIT