Publish Time: 2023-04-28 Origin: Site
A centrifugal fan is a mechanical device used to move air or other gas in a direction at an angle to the incoming fluid.Centrifugal fans usually contain a ducted housing to direct exhaust air in a specific direction or across a radiator; this type of fan is also called a blower, blower, or squirrel cage fan (because it looks like a hamster wheel).The tiny machines used in computers are sometimes called cookie blowers.These fans move air from the fan's rotating inlet to the outlet.They are commonly used in plumbing applications to draw air through ductwork/heat exchangers, or to push air through similar devices.Impellers compared to standard axial fans, they can provide similar air movement from a smaller fan assembly and overcome higher resistance in airflow.
Centrifugal fans use the kinetic energy of the impeller to move the airflow, which in turn moves against the resistance created by ducts, dampers, and other components.Centrifugal fans move air radially, changing the direction of the airflow (usually by 90°).They are tough, quiet, reliable and able to perform in all conditions.
Centrifugal fans, like axial fans, are constant volume devices, which means that at a constant fan speed, the centrifugal fan moves a relatively constant volume of air rather than a constant mass.This means that the air velocity in the system is fixed, but the actual mass of air flowing varies according to the air density. Variations in density can be caused by changes in incoming air temperature and altitude, so these fans are not suitable for applications that require a constant mass of air.Centrifugal fans are not positive displacement devices and have certain advantages and disadvantages compared to positive displacement blowers:Centrifugal fans are more efficient, while positive displacement blowers may have lower investment costs and are capable of higher compression Ratio.Centrifugal fans are often compared to axial fans for residential, industrial and commercial applications.Axial fans typically operate at higher capacity, operate at lower static pressure,and are more efficient.Thus, axial fans are typically used for high-volume air movement, such as warehouse exhaust or room circulation,while centrifugal fans are used to move air in ducted applications such as houses or typical office environments.
Centrifugal fans are drum-shaped and consist of many fan blades mounted around a hub.As shown in the animation, the hub turns on a drive shaft mounted in a fan housing bearing.Gas enters the side of the fan wheel, rotates 90 degrees and is accelerated by centrifugal force as it flows over the fan blades and out of the fan housing.