During the use of rotary vane vacuum pumps, particulate matter and vapors or liquids constitute unpleasant contamination.
Due to the inherent self-compensating clearance adjustment effect of the pump mechanism, it is not particularly sensitive to small mechanism damage. In most designs, plain bearings are selected to be less sensitive to dust than ball bearings. Once the dust particles are separated from the oil due to gravity, a sediment is generated in the oil pool, and it does not participate in the oil cycle until it is removed. These dust particles can be filtered with an oil filter, but it does not seem to be worth it. If the pollution is serious and the filter replacement is too complicated, it is not as easy as changing the oil. It is best to keep dust particles in a place where they can be handled before they enter the pump. For this, the use of dry filters and oily traps is most effective. The protection method chosen should depend on the volume being processed, the size of the dust particles, and the allowable pressure drop. In the case of abrasive dust particles, the surface hardness of the pump parts should be increased to extend the service life.
Substances exposed to low vapor pressure are not uncommon. These substances are condensed in the pump and mixed with the lubricant, or the lubricant is diluted, or paint-like and gel-like deposits are formed. The gas ballast method can do nothing about this. The best way is to block this vapor before it reaches the pump. However, in many cases, this is not appropriate, because the pump works in such a wide pressure range, it is difficult to design an effective trap, or due to certain pollutants, the maintenance of the trap becomes difficult. At this time, most of them are solved by regular oil change.
Corrosive pollutants can be controlled, especially when their amounts are small. Lubricants can act as a buffer between most metal surfaces and corrosives. In addition, if water condensation can be prevented, its corrosive hazards become quite limited. The use of dry gas isolation can effectively prevent atmospheric condensation in the separator. Maintaining a slightly high-pressure dry gas in the separator can prevent the influence of the humidity of the surrounding slope on the pump oil.
Soluble vapor refers to those substances that are difficult to be treated by gas ballasting, which are dissolved in oil and can be released again at the inlet side of the pump. In this case, it is best to use a two-stage pump. Atmospheric oil viscosity should be maintained to the extent that it can work. Oil regenerated with a foreline pump that is not sensitive to pollution or oil purified by vacuum distillation can work well.
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