Since the wind generated by the rotation of the impeller moves along the axial direction, resulting in a relatively low pressure or a compression ratio e < 1.1 and a pressure of 9.8×10 -3 MPa, the ventilator is called an axial fan.
Differences between centrifugal fans and axial fans:
- The principles of generating wind pressure are different. Axial fans drive the gas to move along the axial direction by the rotation of the blades, while centrifugal fans transport the gas by the centrifugal force generated by the rotation of the impeller.
- Generally, the rotor of an axial fan is installed exposed and is relatively bulky; the rotor installation of a centrifugal fan is enclosed and has a small volume.
- Axial flow fans generate very low wind pressure requirements but have a large air volume; centrifugal fans can generate relatively high wind pressure (up to 0.2 MPa), while the air volume is generally not large.
Advantages of centrifugal fans:
Centrifugal fans are relatively simple in layout and have large air volume and low wind pressure.
Disadvantages of centrifugal fans:
Change the flow direction of the medium conduit and are often installed at the inlet of the air conditioning unit, boiler drum, induced draft fan, and the like.
Advantages of axial fans:
Axial fans do not twist the flow direction of the working medium in the air duct, are convenient to install and use, and can be installed in the air duct or at the front end of the air duct outlet.
Disadvantages of axial fans:
Both the air volume and wind pressure are very low, and the fan is generally in the air duct.
