Centrifugal fan is mechanical devices for moving air or […]
Centrifugal fan is mechanical devices for moving air or gas. A fan wheel mounted on a hub inside the casing contributes to the movement. The fan wheel is rotated by an external force (electric motor or internal combustion engine). The fan consists of blades or ribs arranged around the hollow hub. The air or gas to be moved enters the housing through the side of the fan wheel into the hollow hub and then turns 90 degrees to flow through the fan blades. The rotating fan is then named by accelerating the air by applying centrifugal force to it. Accelerated air or gas then leaves the shell.
These fans are able to move the air at higher pressures, making it ideal for use in pollution control systems, central cooling or heating systems, and as blowers in inflatable structures. In addition, by installing the fan on the radiator and connecting it to the metal heat sink, a small, high cooling capacity can be achieved. There are various types of centrifugal fans, which are classified according to the direction of the fan blades and the drive mechanism of the blades.
The radial blade fan includes a blade extending outwardly from the hub. These radial fans are characterized by high pressure, high speed and low volume airflow. These features make it suitable for pneumatic conveying systems and vacuum cleaners. This type of blade is less sensitive to solids and is commonly used in applications with particulate gas streams. Although the efficiency of radial blade blades is as high as 83% by reducing gas turbulence, open radial blades with overload power characteristics allow wear plates to be included in larger abrasive applications.
The rearwardly inclined blades are inclined rearwardly with respect to the direction of rotation of the fan. In addition, these types of fans are divided into three types: flat blades, curved blades and airfoil blades. The curved and flat leaves are capable of handling airflow containing particles in fine air, which generally damage the design of the airfoils. Flat blades can also be modified to provide lower instability than curved blades. On the other hand, the airfoil blades provide better operating efficiency. These blades are typically used for systems with low or medium loads. Bending fans with higher specific speeds are more effective than radial blades and are commonly used for medium flow and high pressure applications. All three backdrop blades have non-overload characteristics. Noise reduction and parallel operation are more stable, these backward tilt blade fans are the best choice for most applications.