Knowledge
Home > Knowledge > Content
Cooling Fan Classification
- May 08, 2018 -

Axial flow fan

The blades of the axial fan push the air in the same direction as the shaft. Axial fan impeller and propeller are somewhat similar, when it is working, most of the air flow is parallel to the axis, in other words, along the axis. Axial flow fans have the lowest power consumption when the inlet air flow is zero static air. When running, the power consumption increases with the back pressure of the air flow. Axial fans are usually mounted on the cabinets of electrical equipment and are sometimes integrated in the motor. Because of their compact structure, axial fans can save a lot of space and are easy to install, so they are widely used.

Its characteristics: higher flow rate, medium wind pressure

 

Centrifugal fan

When the centrifugal fan is operated, the blades push the air to flow in a direction perpendicular to the axis (ie, radial direction), the intake air is along the axis direction, and the outlet air is perpendicular to the axis direction. In most cases, the cooling effect can be achieved by using an axial fan. However, if the airflow is required to be rotated by 90 degrees or when a large wind pressure is required, a centrifugal fan must be used. Strictly speaking, fans also belong to centrifugal fans.

Its characteristics: limited flow rate, high wind pressure

 

Mixed-flow fan

Mixed-flow fans are also called diagonal flow fans. At first glance, mixed-flow fans and axial-flow fans are no different. Actually, the inlet of a mixed-flow fan is along the axis, but the outlet is along the diagonal line of the axis and the vertical axis. Because of the conical shape of the vane and the outer shroud, this type of fan results in higher wind pressure. Compared with axial fans, the centrifugal fan has lower noise at the same size and other comparable performance.

Its characteristics: high flow rate and relatively high wind pressure

 

Cross-flow fan

Cross-flow fans can produce a large area of wind flow and are often used to cool large surfaces of equipment. The air intake and exhaust of such a fan are perpendicular to the axis (as shown in the right figure). The cross-flow fan is operated by using a relatively long barrel-like fan impeller. The diameter of the barrel-shaped fan blade is relatively large. Because of the large diameter, it is possible to use a relatively low speed on the basis of ensuring the overall air circulation rate. , reduce the noise caused by high-speed operation.

Its characteristics: low flow rate, low wind pressure