In the process of using vacuum pumps, no matter whether it is a domestic or imported vacuum pump, the quality is good, but after a long period of work, the correct and timely maintenance will always fail. If the vacuum pump fails to start normally due to long-term unused or failure, then the specific problems will be analyzed in detail. This article mainly summarizes the reasons why the vacuum pump cannot start, or the failure to start due to failure and the troubleshooting methods.

　　 1. The reason why the vacuum pump fails to start is as follows:

　　 (1) The drive motor voltage is incorrect or overloaded.

　　 (2) The overload protection of the motor starter is too small or the set value is too low

　　 (3) The fuse is blown.

　　 (4) If the vacuum pump is equipped with an AC motor: the capacitor of the motor is damaged.

(5) Check the use of vacuum pump oil. The vacuum pump has returned oil, the oil temperature is too low, the oil has deteriorated, fill the vacuum pump cavity with vacuum pump oil, and observe whether the oil quality has been emulsified (foam) or carbonized (blackened) The deterioration of the vacuum pump oil will affect the friction between the rotor and the rotor and cause the blades to get stuck in the pump cavity.

　　 (6) The vacuum pump or motor is stuck.

　　(7) Oil pump wear or foreign matter accumulation

　　 (8) The exhaust pipe is blocked.

　　 Second, the vacuum pump can not start maintenance solutions are as follows:

　　 (1) Provide the correct voltage of the motor

　　 (2) Compare the setting data of the overload protection of the motor starter with the data of the motor nameplate. If necessary, please correct it. If the ambient temperature is high: the set value can be increased by 5% according to the normal motor current

　　 (3) Check the fuse

　　 (4) Repair or replace the motor. (It needs professional technicians to operate)

　　 (5) Vacuum pump oil replacement, disassemble the vacuum pump to repair the cylinder block and other parts, if the blade is damaged seriously, the vacuum pump blade needs to be replaced.

　　 (6) Confirm that the motor is powered off, and disconnect the fan cover. Turn the motor and vacuum pump by hand. If the hand wheel does not move, remove the motor from the pump and check the vacuum pump and the motor separately. If the vacuum pump is stuck, the pump needs to be repaired (requires professional technicians for maintenance and inspection)

　　 (7) Replace the worn parts of the oil pump, clean the foreign objects inside and outside of the vacuum pump, the pump needs to be repaired (maintenance and inspection by professional technicians)

　　 (8) Remove the suction pipe, run the pump alone, and touch the air inlet and outlet to see if the pump works normally. If the pump cannot pump at this time, it is the problem of the pump itself.

　　The vacuum pump cannot be started normally, and the cause of the failure or the location where the fault occurs should be pinpointed. The internal cavity of the pump should also be disassembled and cleaned in time to prevent secondary damage to the pump outlet. If you do not know the inside of the vacuum pump, you must find a professional vacuum pump repair and maintenance manufacturer to carry out professional vacuum pump repair and maintenance work.