Cause of current fluctuation in vacuum pump

Vacuum pump maintenance manufacturer analysis of the vacuum pump current fluctuations

Recently, some customers have reported to our company that the current drop often occurs in the operation of vacuum pump, and the current drop value reaches about 30A, and the drop time is very short, only about 1~3s. With the decrease of the vacuum pump current, the unit vacuum also decreases to different degrees, and the maximum vacuum can decrease to 5kPa. The customer service personnel of our company immediately reported this problem to the technical personnel. After many discussions and studies, the vacuum pump maintenance manufacturer analyzed the causes of the current fluctuation of the vacuum pump caused by the following contents, and provided corresponding solutions.

According to the observed phenomenon, and when manually controlling the relay to switch the valve, it was found that water mist was discharged from the vent of the reversing valve, and the switch of the two doors was normal. And because the vacuum pump circuit breaker valve and the working air valve are running at the same time closed phenomenon and normal operation of the two valves should not be closed at the same time, and the circuit breaker valve is a gas valve, the working air valve is a gas valve. Our company believes that the reason for this is due to two reasons: high humidity in the compressed air and poor air outlet of the reversing valve.

In view of the frequent phenomenon of current fluctuation in the operation of the vacuum pump, it is found through reason analysis and inspection that the circuit breaker valve of the vacuum pump and the working air valve are closed at the same time during operation, while the normal operation should be the circuit breaker valve closed and the working air valve opened.

Regarding the solution of the current fluctuation of the vacuum pump, the technicians and maintenance personnel of dongguan punok vacuum technology co., LTD prepared some materials together.

How the solution works

At the end of the compressed air, make the pipe thicker and install the filter and atomizer. The filter is provided with a blowdown valve and regularly blowdown to improve the quality of compressed air. The atomizer memory has part of the lubricating oil, after the compressed air atomization, into the reversing solenoid valve to prevent the reversing solenoid valve caused by astringent.

And air valve control loop consists of the original work and circular block valve respectively by the respective commutation control instead of single solenoid valve: circular block valve and air valve work share an electromagnetic reversing valve control, make the job of air valve and circular block valve always maintain a compressed air, a no compressed air, completely solve the reversing solenoid reversing undesirable and makes the valve seated.

After the above modification of the vacuum pump, the current fluctuation of the vacuum pump and the instantaneous loss of the vacuum are effectively eliminated, the safety of the unit operation is improved, and the complicated control circuit is simplified to improve the reliability of the control circuit. However, this transformation is best to find a professional vacuum pump maintenance personnel to avoid secondary failure of the vacuum pump or affect their own safety.

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