离心风机是依靠输入的机械能，提高气体压力并排送气体的机械，它是一种从动的流体机械。离心风机广泛用于工厂、矿井、地道、冷却塔、车辆、船舶和建筑物的通风、排尘和冷却；锅炉和工业炉窑的通风和引风；空气调节设备和家用电器设备中的冷却和通风。

Centrifugal fan is a kind of driven fluid machinery, which depends on the input mechanical energy to improve the gas pressure and discharge gas. Centrifugal fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings for ventilation, dust removal and cooling; Ventilation and induced draft of boilers and industrial furnaces; Cooling and ventilation in air conditioning and household appliances.

谷物的烘干和选送；风洞风源和气垫船的充气和推进等，什么是离心风机？作业原理：离心风机是根据动能转换为势能的原理，使用高速旋转的叶轮将气体加快，然后减速、改变流向，使动能转换成势能（压力）。在单级离心风机中，气体从轴向进入叶轮，气体流经叶轮时改变成径向，然后进入扩压器。

Drying and selection of grain; Wind tunnel wind source and air cushion vehicle inflation and propulsion, what is centrifugal fan? Operation principle: centrifugal fan is based on the principle of converting kinetic energy into potential energy, using high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so as to convert kinetic energy into potential energy (pressure). In the single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes into the radial direction when it flows through the impeller, and then enters the diffuser.

在扩压器中，气体改变了流动方向而且管道断面面积加大使气流减速，这种减速效果将动能转换成压力能。压力增高首要发生在叶轮中，其次发生在扩压过程。在多级离心风机中，用回流器使气流进入下一叶轮，产生更高压力。

In the diffuser, the gas changes the flow direction, and the increase of the cross-sectional area of the pipe slows down the gas flow, which converts kinetic energy into pressure energy. The increase of pressure mainly occurs in the impeller, and then in the diffusion process. In a multistage centrifugal fan, a reflux device is used to make the air flow into the next impeller to produce higher pressure.

效果：离心风机的作业原理与透平压缩机根本相同，均是由于气体流速较低，压力变化不大，一般不需要考虑气体比容的变化，即把气体作为不行压缩流体处理。离心风机可制成右旋和左旋两种型式。从电动机一侧正视：叶轮顺时针旋转，称为右旋转风机；叶轮逆时针旋转，称为左旋转风机。

Effect: the operation principle of centrifugal fan is basically the same as that of turbine compressor, both of which are due to the low gas flow rate and little pressure change. Generally, the change of gas specific volume does not need to be considered, that is, the gas is treated as incompressible fluid. Centrifugal fan can be made into right-hand and left-hand two types. From the side of the motor: the impeller rotates clockwise, called the right rotating fan; The impeller rotates counterclockwise, which is called left rotating fan.

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