Large industrial fan is a common industrial product widely used in industrial plants, logistics and warehousing, waiting rooms, exhibition halls, gymnasiums, supermarkets and other tall spaces for environmental ventilation and personnel cooling. The industrial fan can push a large amount of airflow to the ground, and form a certain height of the horizontal movement of the airflow layer on the ground, thereby promoting the overall air circulation, which is conducive to the comprehensive coverage of wind and the three-dimensional circulation of ground air. However, in the operation of large industrial fans, noise is bound to be generated, and the following Aobaojie summarizes several reasons for the noise of large industrial fans.
1. Heterophony. Wind noise sounds only simple wind sound, different sounds are different, when the industrial fan is running, in addition to the wind, if there are other sounds, you can judge that the industrial fan has a strange sound. Abnormal noise may be caused by foreign matter or deformation in the bearing, collision due to improper assembly, or loosening caused by uneven winding of the motor winding.
2. Wind noise. When the industrial fan is running, the blades are periodically subjected to the dynamic action of uneven airflow, resulting in noiseOn the other hand, due to the uneven distribution of the pressure on the fan blade itself and on the blade, the disturbance of the surrounding gas and parts during rotation also constitutes rotational noiseIn addition, due to the turbulent attachment plane, vortex and vortex detachment caused by the flow of gas through the blades, the fluctuation of the pressure distribution of the blades and the vortex noise is generated. The noise caused by these three reasons can be comprehensively called "cutting noise", and the cutting noise of large industrial fans with large air volume and air pressure is also larger.
3. Vibration. If the physical center of mass of the rotor and the center of inertia of the rotating shaft are not on the same axis when the rotor of the industrial large fan rotates, the rotor will be unbalanced. The closest distance between the physical center of mass of the rotor and the center of inertia of the rotating shaft is called eccentricity, and the eccentricity caused by the imbalance of the rotor is caused by the eccentricity, when the rotor rotates, a force is generated by the action of centrifugal force to act on the rotating shaft support and form a vibration, and the vibration is transmitted to all parts of the machinery through the base path.
Permanent Magnet Industrial Large Fan 7The maximum speed of the 3m size can reach 60rpm, and there is no reducer, which realizes the ultra-quiet operation of the ceiling fan motor at 38db. It can effectively help customers find other abnormal sound phenomena other than normal operation wind noise, which is conducive to timely detection and problem solving and ensuring factory safety