Designing method of high-cavitation-resistance no-overload centrifugal pump impeller

Abstract

The invention provides a designing method of a high-cavitation-resistance no-overload centrifugal pump impeller. A number-of-blades Z=3 is set according to a design requirement for flow Q, a lift H and a rotating speed n which correspond with a designed working condition of a centrifugal pump. A blade outlet placement angle is set according to beta2=2-10 DEG. Geometric parameters of the impeller are determined by means of a relational expression, wherein the geometric parameters comprise a blade inlet placement angle beta1, an impeller inlet diameter Dj, an impeller outlet diameter D2, a blade wrap angle theta, a blade outlet width b2, etc. The centrifugal pump which is obtained through the designing method provided by the invention has advantages of no overload characteristic, high cavitation resistance, low matched power, stable operation, and low vibration noise which is far lower 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,...

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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

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