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What are the classifications of high-pressure centrifugal fans?

2020-01-09

According to the different gas flow directions, ventilators are mainly divided into centrifugal, axial flow, diagonal flow and cross flow types.


The ventilator is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine. The exhaust pressure is lower than 1.5×10^4 Pa. Modern ventilators are widely used for ventilation, dust exhaust and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and induced air for boilers and industrial furnaces, air conditioning equipment and household appliances. Cooling and ventilation, drying and selective delivery of grains, air source in wind tunnel and inflation and propulsion of hovercraft.


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Centrifugal fan is a kind of modern society that uses a power machine (mainly an electric motor) to drive the impeller to rotate in the volute casing, and air is sucked in from the center of the impeller through the suction port. Because of the dynamic action of the blade on the gas, the gas pressure and speed can be improved, and under the action of centrifugal force, it is thrown along the blade path to the casing and discharged from the exhaust port. Because the gas flow in the impeller is mainly in the radial plane, it is also called a radial fan.


The centrifugal fan is mainly composed of an impeller and a casing. The impeller of a small fan is directly mounted on the motor, and the large fan is connected to the motor through a coupling or a pulley. Centrifugal fans generally have single-side air intake and use single-stage impellers; those with large flow can be air-intaked on both sides and use two back-to-back impellers, also known as double-suction centrifugal fans.


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In order to make the appearance of the blades have a proper speed distribution, generally curved blades, such as arc blades of equal thickness, are generally used. Turbine fan impellers usually have cover discs to increase the strength of the impeller and reduce gas leakage between the blades and the casing. The connection between the blade and the cover plate adopts welding or riveting. The weight of the welded impeller is lighter and the runner is smooth. The impellers of low and medium pressure small centrifugal fans are also cast from aluminum alloy.


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