If the rotary vane vacuum pump , the oil hole and the pump chamber communicating or exhaust valve, shaft seal, pump cover plane, intake pipe, gas ballast valve and other lax, due to the presence of liquid level difference and the role of gravity and the pump When the chamber is in a vacuum state, the pressure difference between the fuel tank and the pump chamber will return the oil to the pump chamber. When the amount of oil is large enough, the oil will return to the intake pipe, resulting in large resistance when starting next time. Large force, exhaust valve force, starting difficult, affecting parts life, reduce pump reliability. Therefore, try to prevent the pump from returning to oil. The principle is to cut off the oil circuit when the pump is stopped, to eliminate negative pressure in the pump chamber, to reduce the liquid level difference and to reduce the amount of oil returned.
Commonly used specific measures are:
1, the exhaust valve near the oil and the remaining oil separated, the oil level is only slightly higher than the wall.
2, the tank and the exhaust valve on the side, to reduce the oil level and reduce oil.
3, the seat plane to be flat, the valve plus elastic.
4, Shaft seal static sealing parts to be reliable, timely replacement.
5, add oil in the hole, so that the oil level is only slightly higher than the inlet.
6, set the check valve mechanism, automatically shut down when the pump into the hole.
7, set the pump and auxiliary agencies, cut off the pump when the pump.
8, pump mouth filled valve.
9, loaded mouth container.
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