Water Ring Vacuum Pump Types and Advantages and Disadvantages

Water ring vacuum pump is the most common type of liquid ring vacuum pump. The liquid ring vacuum pump is a multi-blade rotor eccentrically mounted in the pump housing. When it rotates, the liquid is thrown into the pump shell and a liquid ring concentric with the pump shell is formed. The liquid ring and the rotor blade form a rotating variable volume vacuum pump with periodic volume change. When working liquid is water, it is called water ring pump.

The water ring pump is mainly used in the process of rough vacuum and large pumping capacity. It has been widely used in chemical industry, petroleum, light industry, medicine and food industry, such as vacuum filtration, vacuum feeding, vacuum concentration, vacuum degassing, etc. The limit pressure of a single stage water ring pump can reach 8-2*103Pa, the limit pressure of a double stage water ring pump can reach 1*102 Pa, and the exhaust capacity is 0.25-500 m3/h.

1. Water Ring Vacuum Pumps  Types and Characteristics

Water ring pumps can be divided into the following types according to their different structures:

(1) Single-stage single-acting water ring pump: single-stage refers to only one impeller, single-acting refers to the impeller every rotating cycle, suction and exhaust once. This kind of pump has higher limit vacuum, but lower pumping speed and efficiency.

(2) Single-stage double-acting water ring pump: single-stage refers to only one impeller, double-acting refers to the impeller every rotation of a week, suction, exhaust twice. Under the same pumping speed, the size and weight of double-acting water-ring pump are much smaller than that of single-acting water-ring pump. Because the working chamber is symmetrically distributed on both sides of the pump hub, the load acting on the rotor is improved. This kind of pump has higher pumping speed and efficiency, but lower limit vacuum.

(3) Double-stage water ring pumps: Most of the double-stage water ring pumps are single-acting pumps in series. Essentially, the impellers of two single-stage single-acting water ring pumps are joined together by a common spindle. Its main feature is that it still has a large pumping speed at a higher vacuum, and its working condition is stable.

(4) Atmospheric Water Ring Pump: Atmospheric Water Ring Pump is actually a unit of air ejector series water ring pump. The air pump in series in front of the water ring pump is designed to improve the limit vacuum and expand the use of the pump.

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