The noise of the china centrifugal blower manufacturers […]
The noise of the china centrifugal blower manufacturers: The cooling fan generates noise because the blades periodically bear the pulsating force of the uneven air flow at the outlet; on the other hand, due to the uneven distribution of the pressure on the blade itself and the blades, the rotation of the surrounding air and parts Disturbance also constitutes rotating noise; in addition, due to the gas flowing through the blades, the flow layer, vortex and vortex separation are generated, which cause the pressure distribution on the blade to pulsate and generate vortex noise.
For fans of the same series, those with higher air volume and pressure will also have higher noise. Therefore, the fan should be selected reasonably. Excessive margin will not only waste electric energy, but also increase noise. For fans of the same model, you should choose a fan that runs at a low speed as much as possible; for different models of fans, you should choose a fan with lower noise instead of just considering the speed. For some users, only pursuing air volume and pressure, of course, the higher the speed, the better, and the noise value can be relaxed; for system work, we always recommend choosing the low noise that meets the heat dissipation requirements, and the lower the better.
Cooling fan The noise of a cooling fan sounds only pure wind. Noise is a kind of sound wave, which has all the characteristics of sound wave.
Abnormal sound of the cooling fan: When the fan is running, in addition to the wind, if there are other sounds (with more than two sounds), it can be judged that the fan has an abnormal sound. Abnormal noise may be caused by foreign matter or deformation in the bearing, collision due to improper assembly, or uneven winding of the motor winding, causing looseness, and abnormal noise may be generated. This kind of fan is considered to be eliminated.
The method of detecting the noise and abnormal sound of the cooling fan: Generally, the method of detecting abnormal sound is close to the ear. The subjective factor is large, it is not easy to identify, and it is easy to cause disputes. If you use a large number of fans, you can use spectrum analysis The device can identify abnormal sounds by checking the energy distribution of the noise spectrum.