What are the reasons for the noise of large industrial fans?

Large industrial fan is a common industrial machine widely used in tall spaces such as industrial plants, logistics storage, waiting rooms, exhibition halls, stadiums, supermarkets, etc., as space ventilation and personnel cooling. Our large-scale industrial fans, large industrial fans, FRP negative pressure fans, environmentally friendly air conditioners, super-large energy-saving industrial fans, cooling water curtains and other series of products are suitable for shoe factories, electronics factories, furniture factories, machinery factories, shopping malls, Internet cafes Ventilation and cooling in many fields will create a good working environment for you. Haobo large-scale industrial fans China EC Blower Fans Manufacturerscan push a large amount of airflow to the ground, forming a certain height of airflow layer horizontal movement on the ground, thereby promoting the overall air circulation. The advantage of this is the all-round ground coverage and the three-dimensional circulation of air. Large in the factory Industrial fans are bound to produce noise during operation.

When a large industrial fan works, the blades periodically bear the pulsating force of the uneven air flow at the outlet, which generates noise; on the other hand, due to the uneven distribution of the pressure on the blade itself and the blades, the disturbance of the surrounding air and parts during rotation is also It constitutes rotating noise; in addition, the turbulent attachment layer, vortex and vortex separation are generated when the gas flows through the blade, which causes the pulsation of the blade pressure distribution and generates vortex noise. The noise caused by these three reasons can be comprehensively called "cutting wind noise". Generally, large-scale industrial fans with large air volume and pressure have relatively large cutting wind noise.

When the rotor of a large industrial fan rotates, the physical center of mass of the rotor and the center of inertia of the rotating shaft are not on the same axis, which will cause the unbalance of the rotor. The closest distance between the physical center of mass of the rotor and the center of inertia of the shaft is called the eccentricity. The eccentricity is caused by the unbalance of the rotor. When the rotor is rotating, a force is generated on the shaft support due to the centrifugal force to form vibration, and the vibration is transmitted to the machine through the base path Various parts.

Wind noise sounds only the wind noise, but the abnormal sound is different. When a large industrial fan is running, if there are other sounds besides the wind noise, it can be judged that the industrial fan has abnormal noise. Abnormal sound 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, which may cause abnormal sound.