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Water ring vacuum pump small note

Water ring vacuum pump is a rough vacuum pump, which is widely used in petroleum, chemical, metallurgy, mining, electric power, light industry, medicine, food and general industries. It is an indispensable basic product that directly affects the performance quality of vacuum complete equipment. . Through the investigation and actual investigation of the data, the development of water ring vacuum pump at home and abroad was comprehensively described and analyzed. The basic structural characteristics of the water ring vacuum pump were analyzed. The necessity of research on water ring vacuum pump was confirmed.
Through in-depth analysis, we can understand the parameters that determine the performance and structure of the water ring vacuum pump: impeller radius R, impeller wheel ratio v, eccentricity e, impeller blade number Z, impeller width B, blade inclination, impeller sinking in the liquid ring Immersion degree h, impeller speed n, pumping rate and ultimate pressure. The shape and position of the suction and exhaust ports, the blade exit angle β and the peripheral speed u have a great influence on the performance of the water ring vacuum pump.
Impeller design is a universal problem. The shape of the radial impeller, tangential impeller and curved impeller is compared. The structure of the curved impeller is reasonable, the compressibility is good, and the efficiency is high. However, by comparison of various impellers, radial The stress and strain values ​​of the impeller and the curved impeller are large, which is determined by its structure. For the design of the impeller, not only the influence of its shape characteristics, but also the strength and manufacturing problems should be considered.
The flow process in a water ring vacuum pump is much more complicated than a general vane pump. In this paper, considering the complexity of the impeller of the water ring vacuum pump in the whole one week of rotation, the cycle of the impeller is divided into the inlet zone, the compression zone, the exhaust zone and the dead zone, according to the pressure of each zone. Look for this regular force to analyze the strength of the impeller. From the analysis of stress, strain and displacement map, it is known that the stress and strain in the compression zone are the maximum due to the uneven distribution of the pressure on the impeller, but the stress and strain are within the allowable range regardless of the impeller. It should be noted that when the rotation speed is high and the pressure is large, the reaction effect of the liquid ring needs to be considered; in addition, the blades on the impeller are always in an alternating state with the rotation of the impeller during operation, and the influence of fatigue should also be considered.

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