During the entire operation of a centrifugal fan, based on the basic principle of converting mechanical energy into potential, the gas is accelerated by the high-speed impeller, then slowed down and changed to flow in, converting mechanical energy into potential. Kinetic energy (pressure). In a unipolar centrifugal fan, gas enters the impeller radially, passes through the impeller and becomes axial, and then enters the diffuser. In the diffuser, the direction of gas flow changes, and the cross-section of the pipeline is raised, thereby reducing the cyclone and converting mechanical energy into pressure energy. The key to pressure increase occurs in the impeller, followed by the entire process of spreading. In multi-stage centrifugal fans, the cyclone enters the next impeller according to the reflux device and causes higher pressure.
Centrifugal fans generally do not need to consider the transformation of gas vaporization heat due to their low gas water flow rate and small pressure change. In other words, they treat gas as a liquid that cannot be reduced. From the motor side, centrifugal fans can be divided into left-hand and left-hand bodies: when the impeller rotates clockwise, it is called a left-hand body fan; When the impeller rotates clockwise, it is called a left-handed fan. When the impeller rotates in the opposite direction, it is called a left fan.