The energy-saving control device of rotary vane vacuum pump includes rotary vane vacuum pump and asynchronous motor driven and connected with it, rotary vane vacuum pump connected with sealed container which needs vacuum pumping, vacuum measuring instrument, control device and AC voltage regulating device. The air pressure sensor connected to the vacuum measuring instrument is located in a sealed container, the electrical signal output end of the vacuum measuring instrument is connected with the control device, the control terminal of the control device is connected with the AC voltage regulating device connected with the power grid, and the output end of the AC voltage regulating device is connected with the asynchronous motor.
The vacuum measuring instrument receives the gas pressure signal in the sealed container transmitted by the pressure sensor, and sends it to the control device through transmission and amplification. The control device stores a program to adjust the voltage according to the gas pressure signal, and compares the received gas pressure signal with the set value. When the gas pressure of the extracted container is lower than the set value, it will send a step-down command to the AC pressure regulating device. According to the command of the control device, the AC voltage regulator supplies the voltage to the asynchronous motor when the gas pressure decreases, so as to reduce the energy consumption. The vacuum measuring instrument is equipped with a gas pressure indicator, which can display the current gas pressure in the sealed container.
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