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If there is an oil hole connected with the pump cavity or the exhaust valve, shaft seal, pump cover plane, intake pipe, gas ballast valve, etc. are not tightly sealed when the rotary vane vacuum pump is stopped, the oil will return to the pump cavity due to the existence of liquid level difference, gravity effect and the pressure difference between the oil tank and the pump cavity when the pump cavity is in vacuum state. When the oil volume is large enough, the oil will return to the air inlet pipe, resulting in high resistance in the next start-up, It is difficult to start due to the large force on the rotating blade and rotor and the exhaust valve, which affects the service life of components and reduces the reliability of the pump. Therefore, we should try to prevent oil return after stopping the pump. The principle is to cut off the oil circuit when the pump is stopped, eliminate the negative pressure in the pump chamber, reduce the liquid level difference and reduce the amount of oil returned.

The common concrete measures are as follows:

1. Separate the oil near the exhaust valve from the rest, and the oil level is only slightly higher than the partition wall.

2. Move the oil tank and exhaust valve to the side to reduce the oil level and oil quantity.

3. The plane of the valve seat should be flat, and the valve plate should be elastic.

4. The static sealing parts of shaft seal shall be reliable and timely replaced.

5. Add a pipe into the oil hole to make the oil level only slightly higher than the oil inlet.

6. A check valve mechanism is set to automatically close the oil inlet hole when the pump is stopped.

7. The oil pump and auxiliary mechanism are set to cut off the oil circuit when the pump is stopped.

8. The pump port is equipped with a charging valve.

9. Fill the inlet container.