What is a centrifugal fan?
The centrifugal fan is a fan in which the air flows in the radial - or perpendicular - direction to the fan shaft. This is, unlike axial fan, a type commonly used for cooling the household in which the air flows parallel to the fan shaft. While axial fans can move large air volumes, centrifugal fans are more suitable for applications requiring high air pressure. For this reason, centrifugal fans are used in many industrial processes and in air pollution control systems. The fan wheel consists of the fan blade mounted on the hub that is on the shaft that passes through the fan cover. The air enters the fan center of the fan wheel, then turns 90 ° to pass the fan blade and leave the fan cover.
The fan drive mechanism can be direct, belt or variable drive. KtThe erý drive mechanism and the function of the centrifugal fan determines at what speed the fan moves and to what extent this speed can be changed. For direct drive, the fan wheel and the engine shaft are directly connected, so the fan speed is the same as the speed of the motor shaft and cannot be changed. One or more strips are used to connect the fan wheel and the engine shaft to the controlled belt and the fan speed depend on the ratio of the shaft size. Variable drive fans allow the fan speed to change using hydraulic or magnetic bonds.
centrifugal fan blades can be forward, back or radial. The front blades are curved in the direction of the fan rotation, have high efficiency and can be built with small dimensions. Back blades may be curved back or straight. They have high efficiency and low-energy requirements and noise emissions-and straight blades backwards are also self-cleaning. Radial blades expand theraight ofFans hubs, self -cleaning and are often used in air pollution control systems because they are least sensitive to particle accumulation.
centrifugal fans are used in many industrial processes because they are able to produce a large increase in air pressure. They are often used for drying of grain and greenhouse ventilation. They are also common in checking air pollution, as well as heating, ventilation and air conditioning systems (HVAC).