离心式风扇是利用动能转化为势能的原理，利用高速旋转的叶轮来加速气体，然后在风筒内减速，改变气流方向，使动能转化为压力能。

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.

陕西离心式风机是依靠输入的机械能，使气体压力排出并排出的机械，它是一种从动流体机械。

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. 

离心式风机的工作原理和透平压缩机基本相同，只是气速较小，压力变化不大，一般不需要考虑气体比容量变化，即气体作不可压缩流体理。

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.

其主要部件为外壳1、叶轮2、轴3、吸气口4、排气孔5。

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

在旋转时，叶轮产生离心力，将空气甩出叶轮，汇集到机壳内，使压力上升，由出口出口排出。排出叶轮内的空气形成负压，并将外部气体抽吸到风机内部。

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.

叶形构造

陕西离心式风机叶轮上的叶片形式对风机的性能有很大影响，陕西离心风机生产厂家在叶片端头旋转的轨迹上，将叶片的所有线从叶片的端头处做一切线，两条切线的交角用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°称为反向叶片，

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

2、β<90°为正向叶片，

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

3、β在90°附近称为径向叶片。

3、 β is called radial blade near 90 ° . 

为进一步提高风机效率，必须对叶片的结构形式进行研究。

it is necessary to study the blade structure.

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