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How to prevent the pollution of rotary vane vacuum pump

Posted by lay1014 
How to prevent the pollution of rotary vane vacuum pump
August 07, 2019 05:34AM

Due to the self-compensating clearance adjustment inherent in the pump mechanism, it is not particularly sensitive to small mechanism damage. In most designs, the selected sliding bearings are less sensitive to dust than ball bearings. Once the dust particles are separated from the oil by gravity, a deposit is formed in the oil pool, which does not participate in the oil cycle until it is removed. These particles can be filtered with oil through a 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 oil replacement. Before dust particles enter the pump, it is best to prevent them in a treatable position. Dry filters and oil traps are most effective. The method of protection selected should depend on the volume to be treated, the size of the dust particles and the allowable pressure drop. In the case of abrasive dust particles, the surface hardness of pump parts should be increased to extend the service life.

Exposure to low vapor pressure is not uncommon. These substances condense in the pump and mix with, or dilute with, the lubricating fluid, or form lacquer-like and gelatinous deposits. The air-ballast method does nothing about it. The best way is to block the steam before it reaches the pump. But in many cases, this is not appropriate because pumps operate over such a wide pressure range, making it difficult to design an effective trap, or because of contaminants that make it difficult to maintain the trap. At this point, most of the way to use regular oil replacement.

Corrosive contaminants, especially in small quantities, can be controlled. Lubricating oil can act as a buffer between most metal surfaces and corrosion. In addition, if you can prevent the condensation of water, its corrosive damage is quite limited. The isolation of dry gas can effectively prevent condensation of atmosphere in separator. Keep slightly high pressure and strong dry gas in the separator to eliminate the influence of ambient humidity on pump oil.

Soluble vapors are substances that are dissolved in oil and can be re-released at the pump inlet side. At this point, it is best to use a two-stage pump. The viscosity of the oil at the atmospheric level should be maintained to the extent that it can work. The oil recycled by the front pump which is not sensitive to pollution or purified by vacuum distillation can work well.

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