Method for obtaining high-efficiency low-noise impeller of centrifugal pump volute

Abstract

The invention provides a method for obtaining a high-efficiency low-noise impeller of a centrifugal pump volute. Firstly main structure sizes: impeller inlet diameter, impeller outer diameter, blade number, blade thickness, blade inlet placing angle, outlet placing angle, blade wrap angle and blade length of a centrifugal pump impeller are obtained through a traditional method. The method includes: 1) measuring centrifugal pump constant performance of the impeller with the structure sizes; 2) predicting centrifugal pump unsteady performance; 3) performing internal flow field analysis and structural improvement on a centrifugal pump; 4) evaluating performance of the improved centrifugal pump, and testing H-Q, N-Q and h-Q performance curves, particle swarm optimization (pos) and program specification block (psb) variation curves; and 5) providing a novel improvement project according to analysis, and evaluating the performance of the centrifugal pump until an ideal centrifugal pump is obtained.

Description

technical field [0001] The invention relates to a design and preparation method of a fluid machine, in particular to a method for obtaining a high-efficiency and low-noise impeller of a centrifugal pump volute. Background technique [0002] The design of centrifugal pump impeller is the key to improving pump performance. It is accompanied by the whole process of pump design and development. Many scholars and research institutions at home and abroad have conducted in-depth and extensive research on impeller design theory, internal flow field structure and energy loss mechanism. , made unremitting efforts to improve the design level. Under some assumptions, Euler deduced the famous vane pump Euler equation, established the quantitative relationship between the theoretical head of the pump and the flow parameters, which has been used as the basis of pump design until now. Lorenz proposed the binary flow theory based on the concept of the fluid working field. Although it is mor...

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Problems solved by technology

Existing design methods for centrifugal pumps have a large amount of experimental work, and seldom design the shape of the performance curve of the centrifugal pump. Maybe the head, efficiency and shaft power of the pump at the design point meet the requirements, but its performance under non-design conditions It is usually not guaranteed, and the unsteady performance of centrifugal pumps is not considered, and the designed pump fluid-induced noise may be large

Furthermore, the existing design method is mainly used for the design of the whole pump, which cannot meet the requirements of impeller design under the condition of fixed volute shape

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