Prevent vacuum pump stop pump return oil

When stop running rotary vane vacuum pumps, if there is oil hole and pump chamber are interlinked or surface of exhaust valve, shaft seal, pump cover, air inlet pipe, air valve, such as untight seal, as a result of the existence of liquid level difference and gravity are in a vacuum tank and pump cavity and differential pressure of the pump cavity, oil will be back into the pump chamber, oil amount is large enough, the oil will return to the inlet pipe, cause next time starting resistance is big, rotary vane and rotor bearing, exhaust valve force big, starting difficulties, affecting the service life of parts, reduce the reliability of the pump. Therefore, measures should be taken to prevent the return of pump oil. The principle is to cut off the oil circuit when stopping the pump, eliminate the pump cavity negative pressure, reduce the liquid level difference, reduce the amount of back-in oil.
Common solutions are:
1. Separate the oil near the exhaust valve from the rest of the oil. The oil level is only slightly higher than the partition wall.
2. Move the oil tank and exhaust valve to the side to lower the oil level and reduce the oil volume.
3. The valve seat plane shall be flat and the valve sheet shall be elastic.
4, shaft seal river static sealing parts to be reliable, timely replacement.
5. Pipe the oil hole so that the oil level is only slightly higher than the oil inlet.
6. Set a check valve mechanism to automatically close the oil inlet when the pump stops.
7. Set up the oil pump and auxiliary mechanism, and cut off the oil circuit when stopping the pump.
8. Install air charging valve at the pump port.
9. Pack the entrance container.
The use of check valve and dynamic seal, static seal structure, even in the event of a sudden power failure and do not inflate the pump, can make the pump chamber in a vacuum for a long time, no significant return of oil. However, its reliability is affected by the quality of manufacturing, assembly, oil seals, exhaust valves and other static seals. If you add an inlet container, then, even if the return of oil, also only to the container, it is more reliable.
Check valve has the function of controlling the oil intake. For example, opening the oil hole only takes about a quarter of the time per revolution. Too much oil makes a lot of noise. As the oil contains gas, the limiting total pressure may also decrease. Too small hole processing is difficult, check valve can overcome this difficulty. In addition, in case the check valve parts are damaged, the pump can still be used after removing the check valve stem. However, after stopping the pump, the pump should be inflated immediately to prevent the return of oil, so timely maintenance, for important purposes, can be installed with relief valve or cut-off relief valve.
Users can choose the corresponding solution according to different circumstances.
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