Customized vacuum unit
JZJLP series dry Roots screw vacuum unit
The function of the water ring pump in the unit is mainly to create the pre-vacuum required by the Roots pump. Generally speaking, the ultimate vacuum degree of the single-stage water ring pump is not high, while the pre-vacuum required by the Roots pump produced in my country is relatively high. Therefore, in fact, we generally do not use a single-stage water ring pump as the backing pump of the Roots pump, but use a two-stage water ring pump with a lower limit pressure as the backing pump, which can also reduce the limit pressure of the unit.
The ultimate pressure of a pump and a water ring pump is 400Pa, which can meet the general vacuum requirements, but its range of use will be limited. If two Roots pumps are used in series and then combined with the water ring pump, it will The ultimate pressure of the unit can be greatly increased (up to 25Pa). Therefore, it is usually seen in this type that two Roots pumps are connected in series and then a two-stage pump is used as the backing pump to form a unit. If a higher ultimate pressure is required, three Roots pumps can be used in combination with a water ring pump, and its ultimate pressure can reach 1Pa.
If the three-stage water ring unit still cannot meet the ultimate pressure, we can use the water ring pump in parallel with the mechanical vacuum pump. This unit is mainly used for vacuuming systems that need to process a large amount of water vapor, require a long time and require very high ultimate vacuum, such as in vacuum drying.
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