The function of the water ring pump in the unit is to create the preparatory vacuum required by the roots pump. Therefore, the maximum allowable discharge pressure of the water ring pump is required. That is to say, on the one hand, the maximum allowable discharge pressure of the roots pump should be increased as much as possible. On the other hand, the maximum allowable discharge pressure of the roots pump should also be increased.
In general, the limit vacuum degree of single-stage water ring pump is not high, but the pre vacuum required by roots pump produced in China is high, so in fact, the single-stage water ring pump is not used as the pre-stage pump of roots pump, but the two-stage water ring pump which can improve the limit vacuum degree is used as the pre-stage pump, and the two-stage water ring pump can also improve the limit vacuum degree of the unit.
The limit vacuum degree of a Roots pump is low, especially when it is combined with water ring pump, the range of use is limited, and the limit vacuum degree of the whole unit may be lower, but if two roots pumps are connected in series and combined with water ring pump, the limit vacuum degree of the unit can be greatly improved. So in this type, we usually see two roots pumps in series, and then use the two-stage water ring pump as the front pump to form the unit.
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