采用电动机驱动的空气压缩机,在贮气罐压力达到额定值后,为了节约电能和减少机器的磨损,通常让电动机停转,待气罐内压力降到一定值后再启动电机。为使压缩机空负荷启动,必须将气缸及管路系统内的余压放掉,即为“放空”。采用环状阀片的压缩机放空机构有手动减荷阀和电磁阀,在一般条件下这两种方法方便可靠,但在特定条件下就不适用了。 The use of motor-driven air compressor, after the tank pressure reaches the rated value, in order to save energy and reduce machine wear and tear, usually let the motor stop, until the pressure in the tank down to a certain value before starting the motor. In order for the compressor to start with an empty load, it is necessary to release the residual pressure in the cylinder and the piping system to “vent”. The compressor discharge mechanism with a ring-shaped valve has a manual relief valve and a solenoid valve, both of which are convenient and reliable under normal conditions but not suitable under certain conditions.