| 摘要 |
PURPOSE:To restart such an electric motor as operating a compressor so easily even at time of voltage drop by actuating a disconnecter with an unloader pilot valve and a throttle valve at a time when pressure in an air tank has exceeded the rating, and stopping the motor. CONSTITUTION:Each of plural units of compressors 2 is driven by an electric motor M, and when stored air in an air tank 15 exceeds the rated pressure, each of air chambers 39a, 39b of both unloader cylinders 59a, 59b is opened. In this case, an unloader pilot valve 16 conducting a flow passage when the air tank 15 exceeds the rated pressure, and a disconnecter 17 provided with a throttle valve 41 stopping the motor M with an air current of the rated pressure both are set up in both pipelines 21, 22 connecting the air tank 15 to the air chamber 39a on one side. In addition, a solenoid valve 18, being controlled by starting of the motor M or a relay installed in a circuit of this motor M, and changing a passage over to either of conduction or atmospheric open, is set up in a pipeline 20 connecting the air tank 15 to the air chamber 39b on the other. |
