LOW-NOISE AXIAL FAN IMPELLER BLADE Russian patent published in 2021 - IPC F04D29/38 F04D29/66 

FIELD: ventilation engineering.

SUBSTANCE: invention relates to ventilation engineering and can be used mainly for industrial axial fans and cooling towers with a low level of the so-called “vortex noise”. The blade has an aerodynamic profile, contains root and end parts, working and non-working surfaces, curved leading and trailing edges, while recesses are made on the trailing edge. It differs in that on the upper half of the working and non-working surfaces of the blade, starting from the axis of the profiles, a number of anti-tearing ribs protruding beyond the trailing edge at an angle from 5 to 15 degrees relative to the chord connecting the extreme points of the root and peripheral parts of the trailing edge of the blade, while the ribs are located along the radius of the axis of rotation of the impeller.

EFFECT: stabilizing the flow of air flow along the profile of the blade along its entire length, which reduces noise during the operation of the axial fan by eliminating flow disruption and crushing the turbulent flow behind the blade into small vortices.

4 cl, 4 dwg