LOW-NOISE AND HIGH-EFFICIENCY BLADE FOR AXIAL FANS AND ROTORS AND AXIAL FAN OR ROTOR CONTAINING SAID BLADE Russian patent published in 2020 - IPC F04D29/38 F04D29/66 

FIELD: ventilation and air conditioning.

SUBSTANCE: disclosed invention provides a novel technology for creating low noise fans, which enables to transform any conventional blade into a low-noise or ultra-low-noise blade at a very low cost, maintaining same high efficiency and peripheral speed of blade ends, as opposed to all other blades with low noise from the level of equipment.

EFFECT: since fans for large cooling devices are the main noise source in said devices, disclosed invention enables cardinal reduction of noise pollution, created by large cooling devices and refrigerating plants.

14 cl, 20 dwg