Patent ID: 9206816
Filing Date: 2015-12-08
Classification: F04D

Abstract:
1. Axial fan, comprising: a hub whose axis coincides with the rotation axis of the fan; a plurality of vanes which extend from the hub; and an outer ring which is coaxial with the hub, and which includes a front portion and a rear portion, the outer ring defining within itself a passage from the front portion to the rear portion, wherein the rear portion of the ring comprises a plurality of appendages which extend axially in a direction away from the front portion of the ring, and which alternate circumferentially with corresponding intermediate recesses, and a radially outermost end of each vane is connected to an inner surface of a respective one of said appendages and an inner surface of the passage; wherein each appendage has transitions with sinuous edges on both edges separated by a central section having a constant distance from the front portion of the outer ring; and wherein a rearmost portion of the connection of each vane to the corresponding inner surface of the appendage is located axially closer to the front portion of the outer ring than a rear edge of the appendage.