Part One ---Differences Between Centrifugal Fan and Axial Flow Fan

Centrifugal Fan VS Axial Flow Fan

Centrifugal Fan PK Axial Flow Fan

Part One The main difference between centrifugal fan and axial flow fan 

1. Centrifugal fan changes the airflow direction, while axial flow fan does not change the airflow direction. 

2. The centrifugal fan installation is more complicated. 

3. As for the centrifugal blower, motor always connect with fan through shaft out of centrifugal fan, while the motor always inside of axial flow fan.  

4. Centrifugal fan is installed as forced draft fan or induced draft fan (ID & FD fan), while axial fan is connected with duct, as ventilation fan. 

5. Generally speaking, the air flow and air pressure both are higher than axial flow fan.  

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Driving Methods of Centrifugal Fan

Driving Methods of Centrifugal Fan

centrifugal fan driving methods

1. Direct-driving

Fan impeller installed on the motor shaft directly. We always called A method driving. 

2. Belting-driving 

The centrifugal fan works through the belt and pulley driving. This method can be divided into B, C, E method. 

(1) B Method

Belt pulley is in the middle of two bearings, and impeller is cantilever installation.

(2) C Method

Belt pulley is installed cantileveredly at one end of bearing, while fan impeller is installed cantileveredly at another end of bearing.   

(3) E Method

Belt pulley is installed cantileveredly, while fan impeller is installed in the middle of two bearing. 

3. Coupling-driving

The centrifugal fan works though the coupling drive. 

(1) D Method

The motor connects with one end of coupling shaft, fan impeller connects with another end of coupling shaft. Motor drive bearing, bearing drive coupling shaft, coupling shaft drive fan impeller. 

(2) F Method

Centrifugal fan has bearing on both sides. 

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Wear-Resistant Treatment of Fans Impeller

Wear-Resistant Treatment of Centrifugal Fan Impeller

Fan Impeller Surface Treatment

The fan impeller can be processed with carburizing, plasma welding, spraying hard alloy, stickup ceramic chip, and so on. 

Common advantage of these methods is to increase the hardness of the blade surface of the centrifugal fan, to improve the wear resistance of the blade. 

But there are some disadvantage.  Carburizing process is too difficult, and carburizing layer thickness need to be determined by the thickness of the blade, wear condition and carburizing process. 

What is more, welding make the surfacing blade deformation, and repeated welding cracks can cause foliage, in this case, the efficiency will be not good. 

Spraying hard alloy, the coating thickness is difficult to determine during the spraying. 

While if stickup the ceramic chips, the effect is better, but the price is higher.

wear resistant treatment of centrifugal fan impeller

Xianrun Blower

       Over 2000 years ago in ancient China, it already has industrial fan, when human didn't find the metal, the fan was made of wood, it also has impeller and casing, but it without motor, it always drive by hand, mostly used for combustion blower.