Impeller capable of increasing centrifugal pump noise tone quality and design method thereof

Abstract

The invention discloses an impeller capable of increasing centrifugal pump noise tone quality and a design method thereof and belongs to the technical field of pumps. Normally, the blades of the impeller of a pump are distributed in an equal-distance manner and the exit edges of the blades are located on the same axial surface, so that intense dynamic and static interference exists between the blades and partition tongues, large noise energy is generated, the noise energy gathers under the signal blade passing frequency, the noise spectrum change shapely, and noise tone quality is poor. The impeller has the advantages that the distance between every two blades are optimized through a rotor automatic balance theory, a plurality of passing frequencies are generated, the noise energy gathered under the single blade passing frequency is reduced, corresponding noise pressure peak is reduced, the reduced noise energy is dispersed to other passing frequencies, stability of the noise spectrum is improved, the exit edges of the blades are allowed not to be located on the same axial plane, interference between the blades and partition tongues is weakened to a certain degree, the noise energy is reduced, overall noise amplitude is reduced, centrifugal pump noise tone quality is increased to a certain degree, and the impeller has certain popularization value.

Description

technical field [0001] The invention belongs to the field of centrifugal pump design methods, and in particular relates to an impeller optimal design method for improving the noise quality of centrifugal pumps. Background technique [0002] As a widely used general machinery, centrifugal pumps play a very important role in all sectors of the national economy. However, the operation of centrifugal pumps often produces large vibration and noise, which not only affects the safety of production and the service life of centrifugal pumps, but also has a great impact on the physical and mental health of surrounding staff. The noise of centrifugal pumps is mainly divided into noise generated by mechanical vibration and noise generated by fluid excitation. Among them, the mechanism of fluid noise is relatively complex and contributes a lot to the overall noise of centrifugal pumps. The main influencing factor of fluid noise is the dynamic and static interference between the blade an...

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Problems solved by technology

[0003] After searching, there is no patent publication related to the present invention, and only some documents simply propose a method for reducing the noise value of centrifugal pumps

"Analysis of Vibration and Noise Reduction of Marine Centrifugal Pumps" (Fluid Machinery, No. 9, 2011) proposed to change the volute of the pump body into a double volute to achieve the effect of reducing noise, but it did not consider the smooth distribution of the noise spectrum, and Since the double volute is a double-layer flow channel, it is difficult to cast, and it is not suitable to use a double volute for a centrifugal pump with a small flow rate and a small size.

"Numerical Research and Acoustic Optimization of Flow-Induced Noise in Centrifugal Pumps" (Jiangsu University Master Thesis, 2011) proposed the effect of reducing fluid noise by cutting the outer diameter of the impeller, but it is often at the expense of the hydraulic performance of the pump, and Simply cutting the impeller does not change the distribution of the blades, let alone affect the passing frequency, and cannot improve the sound quality of noise

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