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Fan Classification
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Publication time:
2018-05-16
Fans can be classified into several types depending on the material used, such as fans with iron housings (standard fans), fiberglass fans, plastic fans, aluminum fans, stainless steel fans, and so forth.
Fans can be classified as centrifugal, axial, mixed-flow (diagonal), and radial, depending on the direction of gas flow.
(1) Centrifugal fan. After entering the impeller of the fan through an axial flow, the air moves predominantly in a radial direction. This type of fan is manufactured based on the principle of centrifugal action; its products include centrifugal fans, centrifugal blowers, and centrifugal compressors.
(2) Radial fan. The airflow enters the fan impeller axially and moves approximately along the axial direction on a cylindrical surface. This type of fan includes radial fans, radial blowers, and radial compressors.
(3) Rotary fan. It uses the rotation of a rotor to change the volume of the air chamber and perform work. Common types include the rotary blower and the rotary compressor.
Fans are classified as axial, centrifugal, and diagonal (mixed-flow) depending on the direction of the airflow entering the impeller.
Fans are classified into local pressurized fans (hereinafter referred to as pressurized fans) and local exhaust fans (hereinafter referred to as exhaust fans), equipped with explosion-proof motors located either outside or inside the airflow, as well as with explosion-proof motors housed in explosion-proof, hermetically sealed chambers.
Depending on the method of pressure boosting, fans can also be classified as single-stage, two-stage, or multi-stage blowers. For example, the 4-72 is a single-stage blower, whereas high-performance fans are multi-stage blowers.
Fans can be classified into axial-flow fans, mixed-flow fans, roof-mounted fans, air-conditioning fans, high-temperature and high-humidity resistant fans, and others, depending on their application.
Fans can be classified into negative-pressure, low-pressure, medium-pressure, and high-pressure fans, depending on the pressure.
Depending on the outlet pressure (pressure rise), they are classified as: fan (≤ 15,000 Pa), blower (15–250,000 Pa), and compressor (≥ 350,000 Pa).
The Huada GKF (KY) high-temperature axial-flow fan for tobacco drying. This fan, capable of operating at high temperatures and elevated humidity levels, is specifically designed for the tobacco-drying process. The motor is equipped with insulation classes F and H; the fan features a new type of four aluminum blades with an arc-shaped profile. The blade angle of the fan can be adjusted according to user requirements. Compared to rectangular blades, this design offers significant advantages, such as large air volume, high efficiency, and energy savings, and is widely used in environments with high temperature and humidity—such as tobacco-drying facilities.
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