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The difference between centrifugal fan and axial fan in fan application

Date: 2017-08-28
Number of visits: 103

The difference between centrifugal fan and axial fan in fan application

In fan applications, axial flow and centrifugal are the two most widely used types. We have to understand his similarities and differences in order to according to their own use of the environment, in the fan selection to make the right choice. The following brief on the two types of fan situation.
Axial fans are characterized by fluid flow along the fan's axis. Such as fans and fans in the family. The centrifugal type is the fluid from the fan inhalation after the use of centrifugal force to the fluid from the circumferential direction to throw out, such as blowers, range hood.
Axial fan: large flow, small pressure head.
Centrifugal fan: big pressure, small flow.
The flow direction of the axial fan is perpendicular to the direction of rotation of the blade, and the direction of the airflow of the centrifugal fan is cut in the direction of rotation of the blade.
What type of fan selection is the most important consideration of flow and system resistance losses.
Centrifugal fan than the axial fan, the biggest drawback is the large size, because the two different structure, in the same air volume, the same wind pressure case, the centrifugal fan power consumption is much larger than the axial fan, but the noise Will be relatively small, so the axial fan used in fire and ventilation, usually use the fan multi-use centrifugal fan. In the high-end buildings in the building, many require priority use of centrifugal fans.
Axial flow is the air flow in the same direction as the axis of the blade. Centrifugal, by centrifugal force to throw out the air. The flow of wind and the axis is parallel to the axial fan, (such as fire exhaust fan) is the centrifugal fan, (such as fan coil fan).
Axial fan and cabinet centrifugal fan of the fundamental difference in the mechanical structure of the fan:
The diameter of the fan of the axial fan is limited to the diameter of the shell, and the centrifugal fan does not have the limitation of this aspect. It can adopt the blade forward or backward blade, and the wind pressure requirement is wider. And the cabinet can do silencer processing, noise indicators have a clear advantage.
As the general use of the motor speed is low, the motor power, power consumption phase more. If you usually use the ventilation system, try to use cabinet centrifugal fan, fire smoke is not commonly used in the system, the use of high-temperature axial fan more economical and reasonable!
Centrifugal fans than the axial fan in the combination of large air volume and wind pressure on the more advantages (mainly refers to the fan efficiency and noise indicators)!
Centrifugal fan and axial fan difference is:
1, centrifugal fan to change the flow of media within the duct, and axial fan does not change the flow of media within the duct;
2, the former air volume and wind pressure are large, the latter air volume and wind pressure are very low;
3, the former installation is more complex, the latter is relatively simple to install;
4, the former motor and fan is generally connected through the shaft, the latter motor is generally in the fan;
5, the former often installed in the air conditioning unit into, exit, boiler drum, induced draft fan, and so on, which is often installed in the duct which, or duct outlet front.

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