The Causes And Solutions Of Fan Noise

First, the concave pressure of the axial fan is greater than that of the convex, so the secondary flow flow from the concave to the convex generated at the front end of the blade is conveyed by the main air flow, which forms the top vortex noise.
Secondly, the inflow turbulence noise generated when airflow with a certain degree of inflow turbulence flows towards the blades.
Third: the airflow flows on the blade surface, and the turbulent Boundary layer noise generated by the fluctuating turbulent attachment layer.
Fourthly, the detached vortex noise generated by the detachment of the turbulent attachment surface on the blade surface at the trailing edge.
The above introduction is about the cause of fan noise, let's take a look at the solutions.
Firstly, regularly check whether the connecting bolts and foundation bolts of each component of the fan are loose, whether the bearings are abnormally worn, and whether the lubrication is poor. Whether the belt is tight, etc. When any abnormalities are found, please stop the vehicle immediately for troubleshooting. The rotating parts such as fan rotor, fan shaft, pulley, coupling, etc. need to undergo strict static and dynamic balance correction, and be assembled on the platform after passing the inspection. While allowing for delivery, it is necessary to reasonably select the gap between the motor cooling fan blades and the air guide ring to effectively reduce the rotational noise of the motor cooling fan blades.
Secondly, during installation, soft materials such as rubber, soft boards, felt boards, etc. should be laid between the blower and the reinforced concrete foundation. Minimize or eliminate vibrations transmitted from centrifugal fans to reinforced concrete foundations.