An Analysis of the Causes of Noise in Fan

Fan is widely used in mining production, although the promotion of the development of the industry, that is the noise of the operation is a headache. That the following by the group of companies to tell you the reasons for the noise generated by the fan, interested may wish to come to understand!

Rotation noise

Rotational noise is the rotation of the working wheel, the wheels on the wheel to combat the surrounding gas medium, causing the pressure of the surrounding gas generated by the pulse, for a given space for a particle, whenever the leaves pass, the fight against the mass of gas The pressure will quickly ups and downs once, the rotating blades continuously passing one by one, continue to produce pressure pulsation, resulting in a large airflow unevenness, and thus to the surrounding radiation noise.

② eddy current noise

Eddy current is also known as turbulence noise. It is mainly caused by the flow of air through the blade interface, the formation of the surface layer and the vortex split out, causing the pressure on the blade pulsation, radiation out of a non-stable flow noise.

Due to the frequency of eddy current noise, the relative velocity of the blade and the air flow is mainly dependent on the relative velocity of the working wheel. The peripheral velocity is continuously changed with the distance of the working wheel to the axis of the rotating shaft.

The aerodynamic noise of the fan is the result of the mixing of the rotating noise and the eddy current noise. The mechanical noise is mainly transmitted through the fan casing to the surroundings. The electromagnetic noise of the motor is lower than the aerodynamic noise and mechanical noise.

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Key words: Qunyi fan