离心风机广泛用于工厂、煤矿、隧道、冷却塔、车子、船只和建筑物通风、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里的制冷和通风；谷类的烘干和选送等。
Centrifugal fan is widely used for ventilation, dust removal and cooling of factories, coal mines, tunnels, cooling towers, cars, ships and buildings; Ventilation and induced draft of boilers and industrial kilns; Cooling and ventilation in air conditioning equipment and household appliances; Drying and selection of grains.
离心风机是依据动能转换为潜能的原理，利用高速运转的叶轮将气体加快，随后降速、改变流入，使动能转换成潜能（压力）。在单极离心风机中，气体从径向进到叶轮，气体流过叶轮时改变成轴向，然后进入扩压器。在扩压器中，气体影响了流动方向而且管路断面面积增大使气流降速，这类降速功效将动能转换成压力能。压力提高主要发生在叶轮中，其次出现于扩压过程。在多级离心风机中，用回流器使气旋进入下一叶轮，产生更高压力。
Centrifugal fan is based on the principle of converting kinetic energy into potential energy. It uses high-speed impeller to accelerate the gas, and then decelerates and changes the inflow to convert kinetic energy into potential energy (pressure). In a unipolar centrifugal fan, the gas enters the impeller from the radial direction, changes to the axial direction when it flows through the impeller, and then enters the diffuser. In the diffuser, the gas affects the flow direction and the increase of pipe section area makes the gas flow decelerate. This kind of decelerating effect converts kinetic energy into pressure energy. The increase in pressure mainly occurs in the impeller, followed by the expansion process. In multistage centrifugal fan, a reflux device is used to make the cyclone enter the next impeller to generate higher pressure.
离心风机本质是一种变流量恒压设备。当转速一定时，离心风机的压力-流量理论曲线应是一条直线由于内部损失，具体特性曲线是弯曲。离心风机中所形成的压力遭受进气温度或密度变化的很大影响。对一个给定的进气量，进气温度(空气密度少)时产生的压力针对一条给定的压力与流量特性曲线，有一条功率与流量特性曲线当鼓风机以稳速运行中，对于一个给定的流量，所需的功率随进气温度的降低而上升。
Centrifugal fan is essentially a variable flow constant pressure equipment. When the speed is fixed, the theoretical pressure flow curve of centrifugal fan should be a straight line due to internal loss, and the specific characteristic curve is curved. The pressure formed in the centrifugal fan is greatly affected by the change of inlet air temperature or density. For a given intake air volume, the pressure generated when the intake air temperature (density of air is low) is for a given pressure and flow characteristic curve, and there is a power and flow characteristic curve. When the blower is running at a steady speed, for a given flow, the required power increases with the decrease of intake air temperature.