How Does Centrifugal Fan Work

Centrifugal fans, also known as blowers, are widely used in various industries for air circulation and ventilation purposes. They operate on the principle of centrifugal force to generate airflow.

 

The working mechanism of a centrifugal fan involves the conversion of kinetic energy to potential energy in order to move air or gas. Here's a brief description of how a centrifugal fan works:

 

1. Impeller: The heart of a centrifugal fan is the impeller, which consists of a series of blades or vanes that are positioned radially around a central hub. The impeller is responsible for creating the airflow.

2. Air Inlet: The air enters the centrifugal fan through the inlet, located on one side of the fan housing. The inlet may include filters or other devices to remove impurities from the air.

3. Centrifugal Force: As the impeller rotates, it creates centrifugal force. The centrifugal force causes the air to be pushed outward and redirected towards the outlet.

 

4. Airflow Direction: The impeller vanes direct the airflow towards the outlet, which is situated at a right angle to the inlet. This change in airflow direction is achieved by the curved shape of the impeller vanes.

5. Pressure Difference: The centrifugal force generated by the rotating impeller creates a pressure difference between the inlet and outlet. This pressure difference causes the air to move from the inlet to the outlet.

 

6. Air Discharge: The air is discharged from the outlet of the centrifugal fan into the desired space or system. The force and volume of the airflow can be adjusted by altering the speed of the impeller or changing the angle of the impeller vanes.

7. Motor: A motor is used to drive the impeller and provide the necessary rotational motion. The motor can be electrically powered or driven by other means, depending on the specific application.

 

Centrifugal fans can be designed with different configurations and features to accommodate various airflow requirements and operating conditions. They are commonly used in HVAC systems, industrial processes, ventilation systems, and many other applications where efficient air movement is required.