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Characteristics of Open and Closed Fan Impeller Castings
- Mar 16, 2018 -

Fan impeller castings will be divided into open impeller castings, semi-open impeller castings and closed impeller castings directly according to the structure. The open fan impeller castings have no cover on both sides of the blade and are suitable for conveying liquids containing a relatively large amount of suspended solids. The efficiency is relatively low and the liquid pressure is not high; the semi-open impeller casting has no cover at the suction inlet side The plate (front cover) and the cover plate (back cover) on the other side are suitable for conveying liquids that are liable to sediment or contain particles, and are also less efficient.


Fully open fan impeller castings are suitable for pumping viscous liquid or containing a small amount of solid liquid. The back of the impeller will be equipped with preparation leaves to reduce the pressure of the stuffing box. This time will also make it difficult for the solids to enter the stuffing box. The impeller itself It will also be fixed to the shaft with a key and secured with a locking nut so that the device is not prone to loosening during operation.


Closed fan impeller castings are used on water pumps. Closed fan impeller casting refers to the shape of the impeller when it rotates, just like an electric fan. Closed impeller castings have a cover plate on both sides of the impeller, which is relatively efficient and suitable for conveying liquids that do not contain impurities.


In the following, we actually need to pay attention to the fact that the definition of stainless steel castings will also be a high-alloy steel that resists corrosion in the air or in chemically corrosive media. Stainless steel has a beautiful surface and good corrosion resistance. It does not have to undergo surface treatment such as plating, but exerts the inherent surface properties of stainless steel and is used in a variety of steels, commonly referred to as stainless steel.


When the fan impeller casting is in actual use, cracks, crushing, and other defects may not appear on the surface of the impeller shaft. Clean and clean means that the water should be removed. The surface of centrifugal fan casing parts, components and equipment should be lubricated. The oil is sorted and placed in order of assembly to maintain the performance of the fan.