離心式風扇是利用動能轉化為勢能的原理，利用高速旋轉的葉輪來加速氣體，然后在風筒內減速，改變氣流方向，使動能轉化為壓力能。

Centrifugal fan is the use of kinetic energy into the principle of potential energy, the use of high-speed rotating impeller to speed up the gas, and then decelerate in the duct, change the direction of air flow, so that kinetic energy into pressure energy.

陜西離心式風機是依靠輸入的機械能，使氣體壓力排出并排出的機械，它是一種從動流體機械。

Shaanxi Centrifugal Fan is a kind of driven fluid machinery, which depends on the mechanical energy input and makes the gas pressure discharged and discharged. 

離心式風機的工作原理和透平壓縮機基本相同，只是氣速較小，壓力變化不大，一般不需要考慮氣體比容量變化，即氣體作不可壓縮流體理。

The working principle of Centrifugal Fan and turbine compressor are basically the same, but the gas speed is small, pressure change is not big, generally do not need to consider the gas specific capacity change, that is, gas Incompressible flow.

其主要部件為外殼1、葉輪2、軸3、吸氣口4、排氣孔5。

The main components are Shell 1, Impeller 2, Shaft 3, Suction Port 4, Exhaust Port 5. 

在旋轉時，葉輪產生離心力，將空氣甩出葉輪，匯集到機殼內，使壓力上升，由出口出口排出。排出葉輪內的空氣形成負壓，并將外部氣體抽吸到風機內部。

In rotation, the impeller centrifugal force, the air will be thrown out of the impeller, collected into the casing, so that the pressure rise from the export discharge. The air in the impeller is discharged to form negative pressure, and the external gas is pumped into the fan.

葉形構造

陜西離心式風機葉輪上的葉片形式對風機的性能有很大影響，陜西離心風機生產廠家在葉片端頭旋轉的軌跡上，將葉片的所有線從葉片的端頭處做一切線，兩條切線的交角用β表示：

The blade shape on the impeller of the Shaanxi Centrifugal Fan has a great influence on the performance of the fan. The manufacturers of the Shaanxi Centrifugal Fan make all the lines of the blade from the end of the blade to make all the lines on the track of the rotation of the Blade End, the angle of intersection of two tangents is expressed in Beta:

1、β>90°稱為反向葉片，

1、 Β & GT; 90 ° is called reverse blade,  In order to further improve the fan efficiency, 

2、β<90°為正向葉片，

2、 Β & Lt; 90 ° is called forward blade,

3、β在90°附近稱為徑向葉片。

3、 β is called radial blade near 90 ° . 

為進一步提高風機效率，必須對葉片的結構形式進行研究。

it is necessary to study the blade structure.

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