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Teach you how to distinguish the noise and noise of the cooling fan




  Industrial cooling fans, in the course of use, with the age of use, more or less a little noise, this is a normal phenomenon. However, many people mistakenly believe that these noises are abnormal sounds, and it seems that the cooling fan seems to be in trouble. In fact, the noise is not equal to the abnormal sound, it is a normal phenomenon.

  What is the noise of the cooling fan?

  The noise of the cooling fan is caused by the fact that the blades of the cooling fan are periodically subjected to the pulsating force of the uneven airflow of the outlet, for example, the uneven distribution of the pressure on the blade itself and the blade, and the disturbance of the surrounding gas and the parts during the rotation. It also constitutes rotating noise. In addition, there is eddy current noise caused by the pulsation of the pressure distribution on the blade due to the flow of the gas through the blade to produce the swell layer, the vortex and the vortex. In general, the noise of the cooling fan is closely related to the movement of the blades, which is physical noise.

  For the same series of cooling fan fans, the greater the wind pressure, the greater the noise. Therefore, we must reasonably choose the fan form according to the actual situation, because the excessive amount of waste not only wastes energy, but also increases noise, which is disadvantageous for us. For the same type of cooling fan, fans with low speed should be used as much as possible. For different types of fans, choose lower noise, not just the speed.

  How did the noise of the cooling fan come about?

  The noise of the cooling fan is different from the noise. The noise sounds like a simple wind, and the abnormal sound, in addition to the wind, there are other sounds (with more than two sounds). The occurrence of abnormal sound may be caused by foreign matter or deformation in the bearing, as well as collision due to improper assembly, or uneven winding of the motor winding, resulting in looseness.

  We generally use the method of close-to-ear listening for abnormal sounds. The subjective factors are large, and it is not easy to identify. It is easy to be controversial. If the number of fans used is large, it can be viewed by means of spectrum analysis equipment. The noise spectrum energy distribution can identify the abnormal sound. .

  At present, industrial cooling fans dissipate heat and dust the equipment, maintain air circulation in the workshop, etc. The application range of the cooling fan is very wide, so it is necessary to master the noise and abnormal sound in the cooling fan.