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To tell you the truth, many problems of vacuum pump have nothing to do with regional problems. For example, the use of vacuum pump in Shandong Province is similar to that in other places. Many problems occur by chance. For example, the leakage of vacuum pump is an internal problem. So we should put aside the distractions and get rid of the fog of problems. Generally speaking, there are several points that can lead to this situation:

1. Vacuum pump sealing is not tight: tighten all the connecting bolts, tighten the packing gland, and tightly wrap the pipe and instrument with other parts. Or replace the gasket and packing. For air leakage, oil lime can also be coated as temporary remedial measures.

2. Bearing skew: this phenomenon makes the impeller inclined in the pump body. For single acting pump, its axial clearance is uneven. When Ye Yan rotates, part of it will rub with the side cover, scratch the side cover and impeller end face, so that the axial clearance increases. When the compressed cavity passes through the increased gap, a large amount of gas will leak into the suction chamber, which will reduce the vacuum degree or exhaust pressure. At this time, the bearing should be removed for repair, and then installed correctly.

3. Front and rear side covers are not concentric: it is possible that the front and rear side covers of the vacuum pump have different axial degrees, and the consequences are the same as the bearing skewness.

4. Heating of vacuum pump: as the temperature of vacuum pump increases, the saturated vapor pressure will also increase, which will reduce the vacuum degree, but this has no effect on the exhaust pressure.

If our use of vacuum pump such a situation, can be compared to the above analysis, to see what our cause of such problems.