Why do most fans only have 3 blades?
Fan pieces mean higher production costs and higher maintenance costs
The fan family use is generally 3 blades, the blade shape is a bird type (design terminology), this form of blade flow, low noise, in accordance with the principle of fluid mechanics, the three leaf has a good dynamic balance, not easy to produce oscillations, thereby reducing the abrasion of the bearings. Extend the service life and reduce the maintenance cost.
We usually use the fan for axial fan, the blade is odd, this is because if the even shape symmetrical blades, and no adjustment of balance, it is easy to make the system resonance occurs, if the blade material is unable to resist fatigue due to vibration, will cause the blade or the spindle is broken, so odd pieces of the fan blade design on asymmetric multi axis design
The more the fan, the more energy it needs to turn, but the fan is too small and the air output doesn't meet the demand.
