Low noise, high efficiency blades for axial flow fans and rotors and axial flow fans and rotors including these blades

摘要

Nowadays, low-noise blades for large-diameter axial flow fans and especially ultra-low noise blades used in large chillers and cooling installations are costly and noise pollution degradation can increase the cost of the entire cooling system by 35% It costs a lot of extra. The present invention is directed to the manufacture of low noise fans that can convert any ordinary blade to low noise or ultra low noise at very low cost while preserving the same high efficiency and tip speed as opposed to all other low noise blades of the state of the art And to provide new technologies. In general, since the fan for the large cooling device is the primary noise source, the present invention will provide an opportunity to significantly reduce the noise pollution produced by the large cooler and cooling facility.