Design method for folded-edge blade structure of inlet end of impeller of middle and high specific rotation speed centrifugal pump

Abstract

The invention provides a design method for a folded-edge blade structure of the inlet end of an impeller of a middle and high specific rotation speed centrifugal pump, blades are subjected to staggered thickening at the position of an inlet of the impeller through folded-edge blades, the staggered blades are designed to have different inlet placement angles and different wrap angles and to have different widths at the position of the inlet of the impeller, the impeller inlet equivalent diameter, the impeller inlet diameter, the impeller outlet diameter, the impeller outlet width, the blade outlet placement angles, the blade wrap angles, the arc length corresponding to the outlet position, between the upper folded-edge blades and the lower folded-edge blades, of the impeller and the impeller outlet position blade thickness are reasonably designed according to the requirement of the folded-edge blade requirement, the impeller inlet position area and the inside-runner flowing state of the middle and high specific rotation speed centrifugal pump in the running process are changed, and therefore the anti-cavitation performance of the pump is improved.

Description

technical field [0001] The invention relates to a method for designing the vane structure of an impeller of a medium-high specific speed centrifugal pump, in particular to a method for designing the structure of a flanged vane at the inlet end of the impeller of a medium-high specific speed centrifugal pump. Background technique [0002] The pump is a kind of general-purpose machinery with a wide range of applications. With the continuous improvement of the level of science and technology, the field of pump application is constantly expanding. Centrifugal pumps have a variety of structures and are the most widely used pumps. They are widely used in various sectors of social life and national economy such as urban water supply, petrochemical industry, shipbuilding industry, aerospace, agricultural irrigation, etc. Therefore, higher and higher requirements are put forward for the performance of centrifugal pumps, such as anti-cavitation performance, requirements for stable op...

AI Technical Summary

Problems solved by technology

In recent years, with the high-speed development of medium-to-high specific speed centrifugal pumps, cavitation phenomena continue to appear. The cavitation phenomenon of centrifugal pumps has an important impact on the performance of centrifugal pumps. The occurrence of cavitation often affects the normal flow of fluid in the pump and generates vibration. , noise, corrosion and damage of flow-passing parts, and performance degradation of the pump, etc., when the cavitation is serious, it may even affect the normal operation of the entire system

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