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工厂里使用的压缩空气储气罐,由一台空气压缩机供给压缩空气,其电气原理如图1。其启动、停止由压力继电器 P 来控制。当储气罐的压力低于额定工作压力0.3～0.2MPa 时,压力继电器 P 闭合,使交流接触器 KM 吸合,空压机的电动机 M 启动。当储气罐中压力超过额定压力2～4%时,压力继电器 P 断开,使KM 释放,电机 M 停止。(图中 HD 为刀开关,FR 为热继电器)。在工厂实际现场,使用压缩空气无一定规律,有
The compressed air tank used in the factory is supplied with compressed air by an air compressor. The electrical principle is as shown in Figure 1. Its start, stop by the pressure relay P to control. When the pressure of the gas tank is lower than the rated working pressure of 0.3 ~ 0.2MPa, the pressure relay P is closed, so that the AC contactor KM pull together, the air compressor motor M starts. When the pressure in the gas tank exceeds the rated pressure by 2 ~ 4%, the pressure relay P is disconnected, KM is released and the motor M is stopped. (HD for the knife switch, FR for the thermal relay). The actual site in the factory, the use of compressed air is not a certain law, there