vacuum unit of vacuum pressure impregnation equipment of start and stop sequence
Opening sequence:
The vacuum valve is located on the opening of the can and on the vacuum main pipe# The cooling water circulating pump of the vacuum unit # starts after a two second delay. The water ring pump of the vacuum unit starts automatically when the water pressure reaches. At the same time, disconnect the vacuum valve for power supply, and disconnect the vacuum valve from the atmosphere.
After a delay of two seconds, open the intake valve of the vacuum device. Two seconds after the water inlet valve of the vacuum unit is opened at the top. When the vacuum reaches 8000 ~ 10000pa, start the vacuum roots pump 2. When the vacuum reaches 2000 ~ 300000 PA, start the vacuum roots pump.
Shutdown sequence:
Close the vacuum valve on the storage tank and the vacuum valve on the vacuum header. Stop the vacuum roots pump. Stop the vacuum roots pump after a delay of two seconds.
After two seconds of delay, the vacuum valve loses power, the vacuum valve is damaged, and the inlet valve and inlet valve of the vacuum unit are closed. The water ring
pump of the vacuum unit and the cooling water circulating pump of the vacuum unit stopped running.
Fault shutdown sequence:
Close the vacuum valve on the storage tank and the vacuum valve on the vacuum header. Stop the cooling water circulating pump of the vacuum unit. Stop the vacuum roots pump and the vacuum roots pump. Vacuum valve power loss, vacuum valve power loss and atmospheric conduction, vacuum unit inlet valve, inlet valve closed. The water ring pump of the vacuum unit stops after a delay of three seconds.
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