Different vacuum systems require different degrees of vacuum. Therefore, under different operating conditions, it is often necessary to use a set of vacuum units to complete the operation, that is, the vacuum pumps working in different pressure ranges are connected in series. Such as vacuum transportation, vacuum impregnation, vacuum filtration, vacuum monotony, vacuum degassing (liquid steel treatment) and other processes need to use low vacuum pump unit with high working pressure and large displacement. Reciprocating vacuum pump, oil sealed vacuum pump, steam radiation pump, water ring pump and roots pump are commonly used in this kind of low vacuum pumping unit.
In addition, the application of vacuum pump unit also needs to be equipped with dust remover, monotone tank and other components according to the actual working environment gas cleanliness, humidity or other special environmental conditions.
Due to the complex working environment of vacuum pump unit, after long-term operation, the vacuum degree can not be pumped up, or the vacuum degree can not reach the original limit vacuum level and other faults. This is related to the oil vapor pollution of the vacuum chamber wall and the pollution of various pollutants in the vacuum process.
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