The life of an industrial fan consists of: motor life, use environment, power supply and other factors.
And the source of noise is
1 . Wind noise
When the cooling fan is working, the blade periodically receives the pulsating force of the uneven airflow of the outlet to generate noise; on the other hand, due to the uneven distribution of the pressure on the blade itself and the blade, the disturbance of the surrounding gas and the component during the rotation also constitutes Rotating noise; in addition, due to the turbulent layer, vortex and vortex detachment caused by the gas flowing through the blade, pulsation of the pressure distribution on the blade causes eddy current noise. The noise caused by these three reasons can be comprehensively referred to as " cut wind noise ", and the general cooling fan with large wind pressure and wind pressure has a large wind cut noise.
2 . vibration
Assuming that the physical center of mass of the rotor is not on the same axis as the inertia center of the rotating shaft when the cooling fan rotor rotates, the rotor imbalance will be caused. The closest distance between the physical centroid of the rotor and the inertia center of the rotating shaft is called the eccentricity. The rotor imbalance causes the eccentricity. When the rotor rotates, a force acts on the rotating shaft bracket to generate vibration due to the centrifugal force, and the vibration is transmitted to the machine via the base path. Each part.
3 . Different sound
　 The wind noise sounds only a simple wind sound, and the abnormal sound is different. When the cooling fan is running, in addition to the wind sound, if there are other sounds, it can be judged that the cooling fan has an abnormal sound. The abnormal sound may be caused by foreign matter or deformation in the bearing, as well as improper assembly, or uneven winding of the motor winding, resulting in looseness, which may produce abnormal sound.
Shenzhen Xin Jianda Electronics Co., Ltd.
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