At the initial stage of fan wheel operation and during all regular inspections, whenever there is an opportunity, it is necessary to check whether fan wheel has defects such as cracks, wear and dust accumulation.

Whenever possible, the fan wheel must be kept clean, and the dust and scale on the fan wheel should be brushed regularly with a wire brush, because with the extension of running time, the dust can not be uniformly attached to the fan wheel, which will cause the balance of the fan wheel to be damaged and even cause the rotor to vibrate.

In addition to improving the dust removal effect of dust collector, the most effective way to reduce the wear resistance of fan wheel is to add lubricant to fan frequently. By special means, wear-resistant and ceramic materials are changed into high-temperature or high-temperature resistant metals and high-speed particle streams, which are sprayed on the blade surface of fan wheel, thus forming a layer with much higher wear resistance, high temperature resistance and oxidation resistance than fan wheel itself. This method can not only reduce the damage of fan wheel dynamic balance caused by wear, but also reduce the imbalance caused by oxide layer.

As long as fan wheel is repaired, it needs to be dynamically balanced again. If conditions permit, portable balance tester can be used to balance on site. Before dynamic balancing, it is necessary to check whether all fastening bolts are tightened. Because fan wheel has been running in an unbalanced state for some time, these bolts may have been loosened.

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