1. Fans can be classified into several types according to the materials used, such as iron shell fans (ordinary fans), glass fiber reinforced plastic fans, plastic fans, aluminum fans, stainless steel fans, etc.
2. According to the direction of gas flow
Fans can be classified into centrifugal, axial, diagonal (mixed flow) and cross flow fans according to the direction of gas flow.
(1) Centrifugal fan 。 The airflow enters the impeller of the fan axially and flows mainly along the radial direction. This type of fan is made according to the principle of centrifugal action, and its products include centrifugal fan, centrifugal blower and centrifugal compressor.
(2) Axial flow fan. The airflow enters the impeller of the fan axially and flows approximately along the axis on the cylindrical surface. Such fans include axial fans, axial blowers and axial compressors.
(3) Rotary fan. Use the rotor rotation to change the air chamber volume to work. Common varieties are Roots blower Rotary compressor.
3. Fans are divided into: Axial flow fan Centrifugal fan and diagonal flow (mixed flow) fan.
4. Fans are divided into press in local fans (hereinafter referred to as press in fans) and flame-proof motors placed outside or inside the flow channel, and flame-proof motors placed inside the explosion-proof sealing chamber of the extraction type local fans (hereinafter referred to as extraction fans) according to their purposes.
5. Fans can also be divided into single-stage, two-stage or multi-stage pressurization fans according to the form of pressurization. For example, 4-72 is single-stage pressurization, and high-end fan is multi-stage pressurization fan.
6. Fans can be divided into axial flow fans, mixed flow fans Roof fan , air conditioning fan, etc.
7. Fan can be divided into negative pressure fan, low pressure fan, medium pressure fan and high pressure fan according to pressure.
8. According to the outlet pressure (pressure rise), it can be divided into: ventilator (≤ 15000 Pa), blower (15-350000 Pa), compressor (≥ 350000 Pa).
9. Classified by layers
There are many classification methods for fans, which can be roughly classified as follows:
(1) According to the pressure generated, it can be divided into: volumetric type: reciprocating type and rotary type; Turbine type: centrifugal, axial flow, mixed flow and cross flow, jet type.
Fan generally refers to turbine type, namely centrifugal, axial, mixed flow, cross flow and other forms.
Its main characteristics are:
Centrifugal fan: high pressure, but small air volume.
Axial flow fan: higher air volume, but lower pressure.
Mixed flow fan: the air volume and pressure are between centrifugal fan and axial fan.
Cross flow fan : With high dynamic pressure, flat airflow can be obtained.
(2) According to the different materials used, it can be divided into:; Iron shell fan (ordinary fan), glass fiber reinforced plastic fan, plastic fan, aluminum fan, stainless steel fan, etc.
(3) According to the direction of gas flow, it can be divided into centrifugal type, axial flow type, diagonal flow type (mixed flow type) and cross flow type.
(4) According to the flow direction of the airflow entering the impeller, it can be divided into axial flow fan, centrifugal fan and diagonal flow (mixed flow) fan.
(5) It can be divided into: press in local fans and flame-proof motors placed outside or inside the flow channel, and flame-proof motors placed inside the explosion-proof sealing chamber of the extraction type local fans.
(6) According to the form of pressurization, it can also be divided into single-stage, two-stage or multi-stage pressurization fans
