The reason for the noise of the chiller fan?

When the blades rotate, they will rub against the air or impact. The frequency of noise is composed of multiple frequencies, and these frequencies are all related to the speed of the fan. Suggestion: If the axial flow fan is equipped with moving and static wings, the number of blades of the two should be different to avoid greater noise resonance.

Noise can also be generated when the blade generates vortex. During the operation of the fan, a vortex will be generated on the back of the moving wing. This vortex will not only reduce the efficiency of the fan, but also generate noise. In order to reduce this phenomenon, the installation angle of the blades should not be too large, and the bending of the blades should be smooth, and the sudden changes should not be too large.

It resonates with the duct shell and generates noise. The joints between the air duct and the inner surface of the fan housing should be smooth to avoid roughness and unevenness, which may cause tearing noise. In addition, when designing, sometimes the outside of the duct can be covered with soundproof materials to reduce noise.

In addition, in addition to the fixed noise of the fan itself, there are many noise sources. For example, due to insufficient precision of bearings, improper assembly or poor maintenance will cause abnormal noise. The motor part also produces noise, some of which are caused by poor design or poor manufacturing quality control, but sometimes it is caused by the internal and external cooling fans of the motor. Therefore, the selection of equipment must be strictly screened for regular products, taking into account factors such as the humanized design of the equipment.