Reasons for imbalance of impeller of negative pressure fan

Negative pressure fan is a kind of equipment which uses air convection and negative pressure ventilation to cool down, so as to achieve forced cooling. It is mainly used in factories and other large places. But in the process of using the negative pressure fan, there may be a variety of circumstances. Then, we will talk about the reasons of the imbalance of the impeller of the negative pressure fan.

The causes of the imbalance in the use of the impeller of the general negative pressure fan can be divided into two kinds: the abrasion of the impeller and the scaling of the impeller. These two conditions are related to the dust collector connected to the draft fan. The main reason for the imbalance of the impeller caused by the dry cleaning device is wear. The reason of the influence of the impeller on the imbalance of the wet dedusting device is mainly fouling.

In the long run, a blade like wear occurs at the blade exit. For the abrasion of the impeller caused by dry dust removal, the most effective way is to improve the anti abrasion ability of the impeller, in addition to improving the dust removal effect of the dust collector. Thus, the operation cost of the negative pressure fan and the whole production system is reduced, and the comprehensive benefit is good.

These oxidation skin and impeller surface of the knot is not average, some oxide skin by vibration or centrifugal force will automatically fall off, this is also caused by the impeller imbalance is a reason. The solution is the practical thermal spray technology, namely metal or ceramic materials such as wear resistance, high temperature resistance to high temperature and high speed flow of particles with special means to spray the impeller blade surface, forming a layer of wear-resistant material, the impeller is high than the gentle antioxidation higher super coat.

After the wet dust removal device, the purified flue gas is very humid, but the dust particles are not very small, but the viscosity is great. When the fouling in the centrifugal force and vibration under the combined effect of shedding, the balance of the impeller is damaged, the entire fan will produce vibration. Although this will increase the cost of manufacturing or maintenance of the impeller, the service life of the impeller is increased by 2 times, and the overhaul period of the fan is prolonged. The impeller which has not been treated by thermal spraying shall be treated with thermal spraying during the maintenance of the equipment.

Dry dust removal device can remove dust in the flue gas the majority of large particles, but a small number of large particles and tiny dust particles with high temperature, high flue gas together through the fan, the leaves were subjected to continuous flushing. When choosing draft fan, the impeller should be preferentially treated by thermal spraying. Because the wear is irregular, resulting in an imbalance of the impeller. This will not only reduce wear and tear, resulting in damage to the impeller dynamic balance, but also reduce the oxidation caused by uneven problems. When they pass through the draft fan, they will be adsorbed on the non working surface of the blade under the action of the gas, especially at the entrance and exit of the non working face, which results in relatively severe dust scaling and gradually thickening.

The above is the negative pressure fan four impeller imbalance reasons and solutions, in the hope that we can help.