如何确定离心风机的风道直径，对于这个问题，我们先需要清楚的是，风道的风速一般都是控制在8到12m/s的范围之间，具体的大小取决于实际的使用情况。这样，风管的截面积=风量/风速/3600，通过这样的方式计算，就可以得到风管的直径。而对于离心风机通气口径的确定，则要根据风机型号的选型规格，来确定了。

How to determine the air duct diameter of centrifugal fan? For this problem, we first need to be clear that the wind speed of the air duct is generally controlled in the range of 8 to 12m / s, and the specific size depends on the actual use. In this way, the cross-sectional area of the air duct = air volume / wind speed / 3600. By calculating in this way, the diameter of the air duct can be obtained. The determination of the ventilation diameter of the centrifugal fan should be determined according to the type selection specification of the fan model.

离心风机是根据动能转化为势能的原理，用高速旋转的叶轮将气体加速，然后减速，改变流动方向，使动能转化为势能(压力)。单级离心式风机，气体从轴向进入叶轮，当气流通过叶轮后转变为径向，再进到扩散器里。扩散器里面的气体改变流动方向出现减速，从而把动能转化为压能。加压过程以叶轮加压为主，扩压过程次之。多层离心风机采用回流器，将气流送到下一个叶轮，从而产生高压。

According to the principle of converting kinetic energy into potential energy, the centrifugal fan uses a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction to convert kinetic energy into potential energy (pressure). For single-stage centrifugal fan, the gas enters the impeller from the axial direction. When the air flow passes through the impeller, it changes to the radial direction, and then enters the diffuser. The gas in the diffuser changes the flow direction and slows down, so as to convert kinetic energy into pressure energy. The pressurization process is mainly impeller pressurization, followed by diffusion process. The multi-layer centrifugal fan adopts a reflux device to send the air flow to the next impeller, resulting in high pressure.

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