離心風機是依靠輸入的機械能，提高氣體壓力并排送氣體的機械，它是一種從動的流體機械。離心風機廣泛用于工廠、礦井、地道、冷卻塔、車輛、船舶和建筑物的通風、排塵和冷卻；鍋爐和工業爐窯的通風和引風；空氣調節設備和家用電器設備中的冷卻和通風。

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.

谷物的烘干和選送；風洞風源和氣墊船的充氣和推進等，什么是離心風機？作業原理：離心風機是根據動能轉換為勢能的原理，使用高速旋轉的葉輪將氣體加快，然后減速、改變流向，使動能轉換成勢能（壓力）。在單級離心風機中，氣體從軸向進入葉輪，氣體流經葉輪時改變成徑向，然后進入擴壓器。

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.

在擴壓器中，氣體改變了流動方向而且管道斷面面積加大使氣流減速，這種減速效果將動能轉換成壓力能。壓力增高首要發生在葉輪中，其次發生在擴壓過程。在多級離心風機中，用回流器使氣流進入下一葉輪，產生更高壓力。

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：離心風機的作業原理與透平壓縮機根本相同，均是由于氣體流速較低，壓力變化不大，一般不需要考慮氣體比容的變化，即把氣體作為不行壓縮流體處理。離心風機可制成右旋和左旋兩種型式。從電動機一側正視：葉輪順時針旋轉，稱為右旋轉風機；葉輪逆時針旋轉，稱為左旋轉風機。

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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