How should the axial flow fan eliminate the noise? We use axial flow fan is mainly to ventilate, but the fan can bring good results, but also produce greater noise, then axial flow fan need to use what method to reduce noise? Noise from the impeller is also normal due to air resistance. This noise is often called discrete noise. The discrete noise is produced by the interaction between the asymmetric structure around the blade and the non-uniform flow field formed by design and experimental rotation. The intake interference noise before intake is caused by the sound of the Front Guide Vane or the Metal Mesh cover. Rotating frequency noise produced by blades in non-smooth or non-symmetrical casing. Once such a problem arises, we must improve the impeller. There are many ways to retrofit blades, the commonly used method is the blade perforation method, which can reduce the eddy noise and make the air resistance pass through well. Usually the working wheel blade perforation method is used, because the vortex separation often occurs in the Blade Tuyere, therefore, the perforation method can make part of the air flow through the high-pressure surface to the low-pressure surface of the blade, and make the separation point of the blade move down, thus reducing the separation zone of the blade exit section. The noise reduction effect is obvious except the air resistance The running life of the bearing will produce certain friction, the possibility of noise is greater, therefore, in the maintenance of the bearing, it is necessary to observe whether the lubrication system can be used normally, the axial flow fan is always in a good environment And can control the size of the noise to a certain extent. To do a good job of maintenance of the fan, often clean, tighten, adjust, lubricate, anti-rust Cross operation, first to eliminate their own causes of noise, second, in the installation process, attention should be paid to the bracket and axial flow fan natural vibration frequency staggered, to avoid resonance.

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