A Fusheng air compressor working principle and electrical principle analysis, only the solenoid valve loses power or its internal leakage, can cause the intake valve to close. After inspection, the two reasons of pipeline leakage and dirty filter plug were eliminated. When the compressor of the twin-screw Fusheng air compressor works, carefully listen to the exhaust valve of the solenoid valve, remove the solenoid valve and check that there is dirt inside, the valve core does not move and the pressure is released, causing the intake valve to not hit. On, the compressor has no air intake, so there is no pressure. The solenoid valve is cleaned and the air compressor is operating normally.

1. Time relay damage failure After the pressure of the double-screw air compressor reaches the upper limit of 0.8MPa, the full load indicator light is on, the pressure displayed on the pressure gauge begins to fall, but the compressor motor is still not stopped, and the exhaust solenoid valve has been activated. When the air pressure drops to the lower limit of 0.5 MPa, the gas can be re-produced. At that time, the voltage at the pressure switch was normal. According to the principle analysis, the time relay may not work, the time delay normally closed point cannot be disconnected, the compressor motor contactor coil cannot be powered off, and the motor will not stop. The time relay power-on test was removed, and it was found that the power supply did not enter the time relay. The power supply of the time relay was disconnected with a multimeter. It was found that the solder joints on the inside of the foot were soldered and the solder joints were re-welded. , the installation test is all normal.

2. When the pressure starts to reach the upper limit at the time of starting, the pressure gauge shows that the pressure reaches the upper limit instantaneously, indicating that the compressed air produced by the compressor cannot be discharged. Careful inspection revealed that the pressure-keeping valve was stuck, probably because the temperature was low at the time and the pressure-holding valve was frozen. The pressure-retaining valve was disassembled and found no abnormalities. After re-assembly, the test was carried out, and the collapse of the Fusheng air compressor no longer occurred.

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