Design method of high anti-cavitation non-overload centrifugal pump impeller

Abstract

The invention provides a design method of a high anti-cavitation non-overload centrifugal pump impeller. The design method comprises the steps of setting the blade number Z equal to 2 and a blade outlet mounting angle beta 2 equal to 2-10 according to design requirements of a flow Q, a lift H and a rotating speed n of a centrifugal pump corresponding to a design condition; and determining the following main geometric parameters of the impeller by employing a relational expression: a blade inlet mounting angle beta 1, an impeller inlet diameter Dj, an impeller outlet diameter D2, a blade wrapping angle theta, blade outlet width b2 and the like. The centrifugal pump obtained by adopting the design method has a really ideal non-overload characteristic, is high anti-cavitation, and is low in matching power and stable in operation; and the vibration noise is far less than an international standard.

Description

technical field [0001] The invention relates to a design method of a centrifugal pump, in particular to a design method of an impeller of a centrifugal pump with high cavitation resistance and no overload. Background technique [0002] Energy is of great significance to the improvement of human living standards and the development of the national economy, and it has become an important material basis for the development of a country. With the rapid development of our country's economy and the decrease of global energy, how to save energy has become an issue that people pay more and more attention to. At present, there is a great demand for pump products in China, and 20% to 25% of the annual power generation will be consumed on pump products. Centrifugal pump is an important pump product in fluid machinery. It has the advantages of high performance adaptability, small size, simple structure, long life, convenient and reliable operation and low maintenance cost. At present,...

AI Technical Summary

Problems solved by technology

At present, the design technology of non-overload centrifugal pumps is not mature enough, and there are mainly the following problems: 1. The non-overload characteristics are not ideal, mainly manifested in the fact that the maximum shaft power is much greater than the rated point shaft power, and the maximum shaft power inflection point is far away from the design flow rate 2. Poor cavitation performance refers to no overload in cavitation conditions. In this case, the operation is unstable, vibration, noise Large, reducing the service life of the impeller and affecting the working environment

Images