When the specific speed increases to a certain value, the centrifugal fan becomes an axial fan. Therefore, the axial flow fan has the characteristics of small flow and large wind force.
Axial flow fan is mainly composed of blades, casing, air inlet and motor, mostly in direct connection mode.
There are generally plate blades and wing blades. Generally, small and medium-sized axial flow fans are mostly flat blades, which are slightly twisted from the blade root to the blade end, and the number of blades is mostly composed of blades.
For the large axial flow fan used in industrial cooling tower with large ventilation, the blades are wing-shaped, and the air volume and pressure of the fan can be changed by adjusting the blade angle.
Large axial flow fans are usually driven by belts or reducers.
Because of the large air volume, axial flow fans are mostly used for ventilation or exhaust in workshops or factories, and large axial flow fans are mostly used in cooling towers and industrial cooling towers in air conditioning projects.
Axial-flow fans are noisy during operation. At present, the low-noise axial flow fans developed by many manufacturers adopt the structure of three wide forward-swept blades with equal grid spacing, which reduces the separation and vortex of airflow through the blade surface, reduces the secondary loss of airflow in the fan, reduces aerodynamic noise and ensures the stability of airflow.
Low-noise axial flow fans can be divided into rotary, fixed and pipeline types according to different uses and positions, which is convenient to install. The rotating direction of the impeller of the axial flow fan always faces the air inlet, and the impeller rotates counterclockwise.
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