In air-cooled air compressors, the cooling fans are mainly divided into axial flow fans and centrifugal fans. At present, some brands of air compressors mainly use centrifugal fans. The following mainly summarizes, analyzes and compares axial flow fans and centrifugal fans.
The fundamental difference between axial flow fans and centrifugal fans lies in the mechanical structure of the fans:
1. Centrifugal fans change the flow direction of the medium in the air duct, while axial flow fans do not change the flow direction of the medium in the air duct;
2. The air volume and air pressure of axial flow fans are very low, while the air volume and air pressure of centrifugal fans are very large;
3. The installation of axial flow fans is more complicated, while the installation of centrifugal fans is simpler;
4. The motor of axial flow fans is generally connected to the fan through the shaft, while the motor of centrifugal fans is generally inside the fan;
5. Axial flow fans are often installed at the inlet and outlet of air conditioning units, boiler blowers, induced draft fans, etc., while centrifugal fans are often installed in the air duct or at the front end of the air duct outlet.
Compared with axial flow fans, centrifugal fans have the following advantages:
1. Very convenient to repair, some models can be equipped with a cleaning door, no need to disassemble the machine for maintenance, saving time;
2. Good ventilation effect, especially suitable for pipeline exhaust or air supply, more obvious heat dissipation effect and no heat dissipation blind spot;
3. Centrifugal fans are generally used to transport air in pipelines, and can be used in places with non-corrosive, flammable and explosive gases;
4. The impeller of the centrifugal fan is reasonably designed to be backward-inclined, without friction during operation, very low noise and not easy to get dusty, and very convenient to maintain;
5. The surface is spray-coated, strong in oxidation resistance, not easy to rust, and the casing and impeller are made of high-quality steel plates, making the centrifugal fan very strong and durable.