After using the rotary vane vacuum pump for a certain period of time, due to the lack of good maintenance work, there is oil smoke at the exhaust port, many customers do not know the reason.

1. The exhaust filter of vacuum pump is a kind of material consuming accessory. It can separate oil and gas in the vacuum pump and prevent the vacuum pump oil from being discharged from the vacuum pump body along with the exhaust gas. The filtered vacuum pump oil will be precipitated and returned to the oil tank. When the exhaust filter fails, the exhaust filter will not play a filtering role, and the vacuum pump oil will be discharged with the exhaust gas, The specific performance is in the exhaust port has white or all blue lampblack. It is generally recommended that the customer needs to replace it after 3-6 months of use. In industries with serious pollution, the replacement time will be shortened.

2. Vacuum pump oil carbon, black, like sludge. To replace the vacuum pump oil, remove the pump from the system and connect it with a clean square plate under the oil drain hole. Screw off the oil filling plug and oil drain plug to drain the dirty oil. Start motor 4 ~ 6 intermittently to discharge all oil in each vacuum chamber. Then add 200 ~ 300cc clean vacuum pump oil from each suction pipe. Start the motor intermittently and clean each vacuum chamber again. After repeated cleaning for 2 ~ 3 times, the oil used for cleaning is released and the oil drain plug is screwed on. Add clean vacuum pump oil from the oil filling plug to the center of the viewing window, and tighten the oil filling plug to prevent air leakage. Special attention should be paid to oil filling: too much oil should be added to reduce the amount of oil added; long time air pumping at the air inlet should be avoided.