Do you know the classification of fans? – Part A

A fan is the abbreviation of equipment that converts mechanical energy into gas pressure energy and kinetic energy. According to the working principle and gas pressure, it is classified as follows:

Centrifugal fan

In a centrifugal fan, the airflow enters the impeller axially and flows out of the fan radially, so it is called a centrifugal fan.

The main features of the centrifugal fan are:

  • Mainly used in working conditions with high pressure and small flow
  • The high-efficiency area is small.
  • Relying on the baffle to adjust, the loss is relatively large.
  • Relatively simple structure and easy maintenance

Axial Fan

In an axial flow fan, the airflow enters the impeller axially and flows out of the fan axially. The airflow passing through the fan does not change direction, so it is called axial flow type. A common example of an axial flow fan is a daily electric fan.

Axial fan blades work similarly to the wings of an airplane, but instead of an airplane applying lift upwards to the wing and supporting the weight of the plane, axial fans hold their position and move the air.

Axial flow fans are mainly used in situations with low pressure and large flow.

The cross-section of an axial flow fan is generally an airfoil shape. The blades can be fixed or adjustable. The adjustable blade angle is one of the main advantages of axial flow fans.

Advanced axial flow fans can change the angle of the blades when the fan is running, thereby changing the flow rate accordingly. This type of fan is called an adjustable blade axial flow fan.

The blade angle of some axial flow fans cannot be adjusted during operation, but the static guide vanes in front of the blades can be adjusted. This type of fan is called a mixed flow fan, or a statically adjustable axial flow fan.

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