Centrifugal pump volute for cavitation suppression and design method and installation method thereof

Abstract

The invention discloses a centrifugal pump volute for cavitation suppression and a design method and an installation method thereof, wherein the centrifugal pump volute comprises a volute body, the volute body is provided with grooves, the grooves are annular grooves and radial grooves, and the annular grooves or the radial grooves are formed in the inner side of the volute body; and fluid is accumulated in the grooves, the pressure of the position where leakage vortexes are located is improved, a low-pressure area generated by the leakage vortexes is reduced, and cavitation is restrained on the premise that hydraulic characteristics such as lift efficiency are not reduced basically. According to the design method, the grooves are designed, and the positions, the shapes and the sizes of the grooves are determined. According to the installation method, a shell, a first side plate and a second side plate are mounted according to the design result, the manufacturing quality of the shell, the first side plate and the second side plate can be conveniently controlled, the annular grooves or the radial grooves can be conveniently formed in the second side plate, the positions and the shapes of the grooves can be conveniently controlled, and meanwhile it is ensured that the width and the depth of the grooves meet the design requirement.

Description

technical field [0001] The invention belongs to the technical field of centrifugal pumps, in particular to a centrifugal pump volute used for cavitation suppression, its design method and its installation method. Background technique [0002] Centrifugal pump cavitation will cause abnormal vibration of the impeller and pump body, generate noise, and cause unstable operation, reducing hydraulic performance such as head and efficiency. Long-term operation in the cavitation state will also cause denudation of the metal on the impeller surface of the centrifugal pump, shortening the life of the pump body. Therefore, the centrifugal pump should avoid cavitation during actual operation. [0003] For open and semi-open centrifugal pumps, due to the relative motion between the impeller and the volute, the pressure difference between the suction surface and the pressure surface causes leakage flow at the top of the impeller, and a leakage vortex is formed at the tip of the impeller ...

AI Technical Summary

Problems solved by technology

[0002] Centrifugal pump cavitation will cause abnormal vibration of impeller and pump body, generate noise, and cause unstable operation, and reduce hydraulic performance such as head and efficiency

Running in a cavitation state for a long time will also cause denudation of the metal on the impeller surface of the centrifugal pump, shortening the life of the pump body

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