Method for lowering multi-wing centrifugal fan noise

Abstract

This invention relates to a method for reducing noises of multi-wing centrifugal fans including the following steps: 1, carrying out number simulation and molding simulation to a model fan with the technology of computation of hydrokinetics, 2, determining the sphere of low noise fan structure parameters, 3, setting up multi-target restrained function of the fan with noise and efficiency as the target, stipulating the restraining condition in terms of the parameter sphere in step 2 to determine initial available points to carry out iteration computation utilizing an engineering complex method to get the design parameter of the fan, 4, carrying out orthogonal combination to the received optimized parameters and number simulation and determining the section influencing the fan performance the most by listing main elements method to get a final design plan, 5, carrying out number simulation to non-concentric and concentric of the impeller and spiral casing.

Description

technical field [0001] The invention relates to a method in the technical field of noise control, in particular to a method for reducing the noise of a multi-blade centrifugal fan. Background technique [0002] The noise control research of fan is a comprehensive subject involving the intersection of multiple disciplines such as acoustics and aerodynamics. How to reduce the aerodynamic noise to the allowable level with the most reasonable measures requires a detailed study of the classification and mechanism of the aerodynamic noise of the fan and how to control the aerodynamic noise of the fan. For fans with certain noise, total pressure and air volume requirements in traditional design methods of centrifugal fans, the determination of geometric parameters such as blade outlet installation angle, blade inlet installation angle, outer diameter, inner diameter, number of blades and other geometric parameters is too arbitrary when designing the impeller. , lack of scientific ...

AI Technical Summary

Problems solved by technology

For fans with certain noise, total pressure and air volume requirements in traditional design methods of centrifugal fans, the determination of geometric parameters such as blade outlet installation angle, blade inlet installation angle, outer diameter, inner diameter, number of blades and other geometric parameters is too arbitrary when designing the impeller. , lack of scientific accuracy; and when designing the matching volute, not only the assumptions put forward are quite different from the actual flow conditions of the volute, but also there is a lot of randomness in determining the parameters such as the width and opening of the volute The result must be that there may be many different design schemes for fans with certain noise, total pressure, and air volume performance requirements. It is very difficult to determine the best scheme for different designers, especially the initial designer. , it is often necessary to do a large number of model comparison tests to screen various design schemes, resulting in long product development cycles and high costs, but the quality of products may not be guaranteed to be optimized

[0003] After searching the literature of the prior art, it was found that the Chinese patent application number: 200610016773, and the title of the invention is: a method for reducing the noise of an axial flow fan. This patent relates to a method for controlling the noise of an axial flow fan. According to the noise control theory and experimental tests to reduce the noise of axial flow fans, but because this method is only for the noise reduction of axial flow fans used in larger equipment, it cannot be realized for multi-blade centrifugal fans widely used in small ventilation equipment such as air conditioners and range hoods. noise reduction

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