Water ring vacuum pump adopts single-stage single-acting structure, which has the advantages of simple structure, convenient maintenance, reliable operation, high efficiency and energy saving, and can adapt to the bad working conditions such as large displacement and fluctuation of load impact. Vacuum pump is widely used in paper, chemical, petrochemical, light industry, pharmaceutical, food, metallurgy, building materials, stone tools, coal washing, mineral dressing, chemical fertilizer and other industries.
The performance of water ring vacuum pump is expressed by the following parameters: exhaust pressure, vacuum degree, air volume, shaft power, effective power and efficiency. The factors that influence these properties are: the size of the impeller, eccentricity distance, atmospheric pressure, temperature, water temperature, circumference speed of the impeller, air relative humidity, etc. The circumferential speed of the impeller has a very important influence on the performance of the pump. For a running pump, the effect of circular speed on vacuum pump performance is essentially the effect of rotary speed on pump performance.
Water ring vacuum pump relative to the specified speed for variable speed operation, can make the critical compression ratio decreased, can not meet the performance requirements, growth in the runtime that quickly rising, shaft power efficiency drops, not only economic, but if they do not change accordingly increase the capacity of form a complete set of motor, and burning motor, the risk of accidents, slow running, may also be eddy current in the water ring, unstable working condition (especially in the area of high vacuum degree), and even could not form water ring, the pump will not work. So deviation from the specified speed of operation is not appropriate.
The ultimate vacuum degree of water ring vacuum pump has nothing to do with the rotating speed, but the air volume, axial power and supplementary water amount all increase with the increase of the rotating speed, but the degree of increase is different, the axial power increases more, and the supplementary water amount increases least.
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