Noise-reducing method for electric fan based on blade modification and improved blade structure of electric fan

Abstract

The invention discloses a noise-reducing method for an electric fan based on blade modification and an improved blade structure of the electric fan. The method comprises the following steps of: (1) establishing a hydromechanic calculating model of an original blade structure of the electric fan; (2) performing kinetic analysis on the original blade structure of the electric fan to obtain fluid field data and monitoring the sound pressure level of noise of a preset measuring point, wherein the fluid field data comprises a blade surrounding vorticity value and vortex structure distribution; (3) performing a modified design on the fan blade structure of the electric fan continuously and performing kinetic analysis on the modified blade structure of the electric fan to obtain fluid field data and measured point noise data, and reducing the blade surrounding vorticity value and crushing large vortexes into small vortexes till the sound pressure level of noise of the preset measuring point is reduced on the premise that the blast capacity is invariable at same input power; and (4) manufacturing a fan model, measuring the blast capacity and the sound pressure level through experiments, and verifying the reducing effect of the sound pressure level of the noise of the measured point. By modified noise reduction on the blade of the fan by means of computational fluid mechanics, the method is high in pertinence and high in operability.

Description

technical field [0001] The invention relates to a noise reduction design method of an electric fan based on blade modification, which is used for reducing the overall noise of the electric fan at high rotational speed and improving the air volume of the electric fan at the same power, and belongs to the technical field of mechanical structure design. Background technique [0002] At present, there are few domestic researches on noise reduction of household electric fans. The research on fan noise is concentrated on wind tunnel fans, centrifugal blower fans, aeroengine fans and notebook computer fans. [0003] Compared with the above-mentioned high-speed fans, the general electric fans are smaller in size and lower in speed (below 1000rpm), so there is a big difference in the design of the blades. The noise reduction modification methods in the current literature are mainly based on high-speed fan blades with larger diameters, such as increasing the number of propeller blades...

AI Technical Summary

Problems solved by technology

Generally speaking, the number of fan blades is required to be fixed, and the diameter of the blades is fixed, so these methods are not suitable for the design of electric fan blades that ensure the air volume requirements.

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