Classification and types of fans

Fans are mechanical devices that are driven by mechanical energy to accomplish gas compression and gas delivery. Fans include categories such as fans, blowers, and compressors, but do not include positive displacement blowers and compressors. There are many types of fans, and the common division is based on the material of the fan, the gas flow of the fan, and the use of the fan.

Fan's material classification

Commonly used in the fan material is cast iron, ordinary fans belong to this type of iron shell fan. Fans are also made from other materials, such as FRP fans, PVC fans, aluminum alloy fans and stainless steel fans, etc. The fans made of these materials have good anti-corrosion, anti-abrasion or high-temperature performance.

The gas flow from the fan's gas to the classification fan is the direction that drives the gas when the fan is running. If the gas is flowing in the same direction as the impeller's axis, it is an axial fan. If the gas is centered on the axis of the impeller, it will be centrifugal. Fan. In addition to these two types, there are also diagonal fans and cross-flow fans.

Fan use classification
Fans can be divided into multiple types depending on the purpose, such as exhaust fans, air conditioning fans, and roof fans. These fans are all designed for special purpose, so they are different from ordinary fans in terms of appearance, material, and function. For example, the roof fan can be designed as a bi-directional reversible exhaust fan.

Other categories of fans

Fans can be divided into single-stage pressurized blowers, double-stage pressurized blowers, and multi-stage pressurized blowers, depending on the number of times the airflow is pressurized. For example, a Roots blower is a typical multi-stage pressurized blower. Fans can be divided into push-in fan and draw-out fan according to the designed structure and the installation position of the motor.