Cady specializes in the research, development, and sales of vacuum equipment.
The JZJS Roots Water Ring Vacuum Unit is a combination of a Roots pump as the main pump and a water ring pump as the primary pump in series. Using a water ring pump as the primary pump in the Roots Water Ring Vacuum Unit is more advantageous than other vacuum pumps. It overcomes the drawback of low vacuum pumping rate at a certain pressure, which is due to the high ultimate pressure difference (the ultimate pressure of the unit is much higher than that of the water ring pump), while retaining the Roots pump's advantage of rapid operation and high vacuum pumping rate. It is especially suitable for removing large amounts of condensable steam, particularly when the gas-lubricated mechanical vacuum pump's ability to remove condensable steam is insufficient, or when the solvent used can deteriorate the pump oil, affecting performance, or when the vacuum system does not allow oil contamination. When equipped with explosion-proof motors and electrical equipment and adhering to the corresponding safety regulations, it can also remove flammable and explosive gases. Therefore, the Roots pump-water ring pump unit is widely used in the vacuum distillation, vacuum evaporation, and dehydration crystallization in the chemical industry; freeze-drying in the food industry; polyester chips in the light纺 industry; and vacuum systems for high-altitude simulation tests, etc.
Roots water ring vacuum pump units, generally come in the following types:
(1) Roots Pump - Water Ring Pump: The role of the water ring pump in the system is to create the preliminary vacuum required for the Roots pump. Generally, the ultimate vacuum 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 the 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 followed by a two-stage pump as the preliminary 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 for extended periods and have high ultimate vacuum requirements, such as in vacuum drying applications. Water ring pumps are suitable for vacuum systems handling large volumes of steam, but due to their lower ultimate vacuum, the overall unit's ultimate vacuum is relatively low. Although in vacuum systems with higher vacuum requirements, a mechanical vacuum pump with a higher ultimate vacuum is needed as a primary pump. The air-cooled mechanical vacuum pump can be paralleled with the water ring pump to serve as a preliminary pump for the Roots pump. During vacuum drying, pre-evacuation is first carried out using the water ring pump until a significant reduction in steam volume is achieved, then the air-cooled mechanical vacuum pump is activated to disconnect 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 involving the removal of a large amount of steam and gases with certain corrosiveness and condensability, due to its use of a water ring pump as the primary pump. This includes processes such as vacuum distillation, evaporation, dehydration, crystallization, and drying.
