Centrifugal Fan Blade Type – Forward
- The blade outlet angle β2 > 90°.
- Forward blades generate high air pressure, but have low efficiency, and impurities are likely to accumulate between the impellers. They are generally used in areas where the air volume is moderate but the pressure requirement is high.
- The widely used 9-19 series blades are generally narrow and have a large number of blades. The 9-26 series centrifugal fans use this kind of impeller.
Centrifugal Fan Blade Type – Radial Fan
- The blade outlet angle β2 = 90°.
- The structure is simple, and the production cost is low.
- The parameters are between those of the forward type and the backward type, but the efficiency is relatively low, so the application is not very extensive. Due to its characteristic of being not easy to scale, it is only used in a few occasions such as mines.
Centrifugal Fan Blade Type – Backward
- The blade outlet angle β2 < 90°.
- Due to its excellent aerodynamic performance, large air volume, low pressure, but high efficiency, the efficiency of domestic centrifugal fans with backward impellers can generally reach 80% – 90%, so it has been widely applied. In addition, due to its characteristic of being not easy to scale, it is widely used in industries such as the chemical industry and power plants.
- The process requirements are high.
Centrifugal Fan Blade Type – Backward Airfoil
- Because its blade section is the same as that of an airfoil, it is called a backward airfoil blade.
- Due to its unique structural characteristics, the process required in the production process is very strict.
- The unique blade form enables it to have a power change range in the state of large air flow, protecting the safety of the fan equipment.
