US 2020/0049166 A1Published application

Low noise and high efficiency blade for axial fans and rotors and axial fan or rotor comprising said blade

AssigneeR.E.M. Holding S.R.L.

InventorROBERTO EDUARDO MOSIEWICZ

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Abstract

Today the low noise blades and especially the super low noise blades for large diameter axial fans which are employed in the big cooling machines and cooling plants are so costly and are requiring so many extra costs on the other related equipment, that the noise pollution abatement can increase the whole cooling apparatus cost by up to a 35%. This invention, provides a new technology to make low noise fans able to transform any common blade into a low noise or very low noise at very low cost, preserving the same high efficiency and tip speed, as opposite to all the other low noise blades at actual status of art. As the fans for the big cooling apparatus are generally their main noise source, this invention will offer the opportunity to dramatically reduce the noise pollution produced by big cooling machines and cooling plants.

Claims15

Dependent claims

Super low noise industrial axial fan, having large diameter and adjustable pitch angle and comprising a blade (1) comprising a front edge and a rear edge, the front edge being the leading edge (1I) of the blade (1) facing the direction of rotation of the fan in an operative condition, and said rear edge being the trailing edge (1t) of the blade (1), said blade (1) comprising a root portion by means of which the blade (1) is fixed to the rotor of the fan, along with a first blade portion (1a) extending from said root portion (1r) and a second blade portion (1b) extending from said first portion (1a), wherein the portion of the leading edge (1I) as defined by said first portion (1a) and the portion of said leading edge as defined by said second portion (1b) extend along different directions and define an obtuse angle (V) so that the projection of the blade on a plane containing both the portion of the leading edge (1I) as defined by the first portion (1a) and the portion of the trailing edge (1t) as defined by said first portion (1a), is V-shaped.

Dependencies are inferred from the claim text.