Patent ID: 11885348
Assignee: R.E.M. HOLDING S.R.L.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A blade assembly for a large dimension axial fan having a rotation axis, comprising:
a root structure intended to mechanically connect the blade assembly to a hub of the axial fan;
a blade comprising at least one radially inner portion and a radially outer portion, the radially outer portion of the blade having a simple airfoil and the radially inner portion of the blade having a composite airfoil comprising a fore semi-airfoil and an aft flap, wherein:
the semi-airfoil of the blade is assemblable with a predefined pitch angle with respect to the hub of the axial fan by means of the root structure;
the aft flap is mounted on the blade such that it can be fixed in a position comprised between a maximum deflection position and a minimum deflection position with respect to the pitch angle; and
between the fore semi-airfoil and the aft flap a channel is defined suitable for allowing a fluid flow from a face to a back of the composite airfoil.