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The JZJS Roots Water Ring Vacuum Unit is composed of a Roots pump as the main pump and a water ring pump as the preliminary pump in series. Choosing a water ring pump as the preliminary pump in the Roots Water Ring Vacuum Unit is more advantageous than other vacuum pumps. It overcomes the drawback of low gas extraction rate at a certain pressure, which is caused by the single water ring pump's limited pressure difference (the unit's maximum pressure is significantly higher than that of the water ring pump), while retaining the Roots pump's advantages of quick operation and high gas extraction rate. It is particularly suitable for extracting large amounts of condensable steam, especially when the mechanical vacuum pump equipped with gas traps has insufficient capacity to remove condensable steam, or when the solvent used can degrade the pump oil and affect performance, or when the vacuum system does not allow oil contamination. With explosion-proof motors and electrical equipment, and under compliance with the relevant safety regulations, it can also extract flammable and explosive gases. Therefore, the Roots pump-water ring pump unit is widely used in vacuum distillation, vacuum evaporation, and dehydration crystallization in the chemical industry; freeze-drying in the food industry; polyester chips in the light textile industry; and vacuum extraction systems for high-altitude simulation tests, etc.

Roots water ring vacuum pump units, generally come in the following types:

Roots Pump - Water Ring Pump: The role of the water ring pump in the unit is to create the preliminary vacuum required for the Roots pump. Generally, the ultimate vacuum level of a single-stage water ring pump is not high, and the preliminary vacuum required by the Roots pumps produced in our country is relatively high. Therefore, a single-stage water ring pump is usually not used as the preliminary pump for the Roots pump, but a two-stage water ring pump with a lower ultimate pressure is used instead, which can also reduce the ultimate pressure of the unit. The ultimate pressure of a Roots pump and a water ring pump is 400 Pa, which can meet general vacuum requirements, but its application range is limited. If two Roots pumps are connected in series and combined with a water ring pump, the ultimate pressure of the unit can be significantly increased (up to 25 Pa). Therefore, in this type, it is common to see two Roots pumps connected in series and then combined with a two-stage pump to form the unit. If a higher ultimate pressure is needed, a combination of three Roots pumps and a water ring pump can be used, with an ultimate pressure of up to 1 Pa.

(2) If the three-stage Roots water ring vacuum unit still cannot meet the ultimate pressure, a Roots pump-water ring pump parallel mechanical vacuum pump can be used. This unit is mainly used for vacuum systems that require the handling of large amounts of steam over a long period, with a very high ultimate vacuum requirement, such as in vacuum drying applications. Using a water ring pump is suitable for systems that need to handle large volumes of steam, but due to its lower ultimate vacuum, the overall unit's ultimate vacuum is relatively low. Although in vacuum systems requiring a higher vacuum, a mechanical vacuum pump with a higher ultimate vacuum is needed as the primary pump. The air-cooled mechanical vacuum pump can be paralleled with the water ring pump to serve as the pre-pump for the Roots pump. During vacuum drying, pre-evacuation is first performed using the water ring pump until a significant reduction in steam is achieved, then the air-cooled mechanical vacuum pump is activated to cut off the water ring pump. In cases where the drying process takes a longer time, less cooling water and power are required.

Application Scope

This unit is particularly suitable for processes that require the removal of large amounts of steam and gases with certain corrosivity and condensability, thanks to the use of a water ring pump as the primary pump. This includes processes such as vacuum distillation, evaporation, dehydration, crystallization, and drying.