Hollow vane, and associated production method

Patent metadata

Field	Value
Publication number	US-2016123167-A1
Application number	US-201414893332-A
Country	US
Kind code	A1
Filing date	May 28, 2014
Priority date	May 28, 2013
Publication date	May 5, 2016
Grant date	—

Abstract

A hollow vane, includes a main portion, of which the cavity is closed by a cover, that is produced by expanding the main portion relative to the cover, for example by means of differential thermal expansion, then by placing the cover at the bottom of the opening of the cavity, before allowing the main portion to close again, closing a nesting between a protrusion at the bottom of the cover and a widening at the bottom of the opening. The disadvantages linked to the use of welding, glue or even assembly parts are as such avoided.

First claim

1 - 10 . (canceled)

11 . A hollow vane comprising a main portion and at least one cover, the cover being mounted in an opening of the main portion in such a way as to close the opening and to form with the main portion an external, substantially continuous face of the vane, the main portion further comprising a cavity that communicates with the external face via the opening, wherein the cover comprises at least one protrusion, extending over a portion of a thickness of the cover at a distance from the external face, and over opposite portions of the edge of the cover, and the main portion comprises at least one widening of the opening, located at a distance from the external face and wherein the protrusion of the cover penetrates.

12 . The hollow vane according to claim 11 , wherein the cover is mounted without clearance in the opening of the main portion between the protrusion and the external face, and the protrusion is housed in the widening with clearance.

13 . The hollow vane according to claim 11 , wherein the cover is attached to the main portion without any intermediate material.

14 . The hollow vane according to claim 11 , wherein the protrusion and the widening extend either over compete edges of the opening and of the cover, or over portions that can be superimposed of said edges.

15 . The hollow vane according to claim 11 , wherein the protrusion and the widening extend in front of the leading and trailing edges of the vane, the cover protruding outside of the main portion in front of the leading edge and retracting in the main portion in front of the leading edge, by means of a decreasing thickness from the cover from the leading edge to the trailing edge, or by a decreasing depth of the widening from the leading edge to the trailing edge.

16 . The hollow vane according to claim 11 , wherein the opening and the cover are limited, at the protrusion and at the widening, by oblique edges, and as such have sections that continuously widen from the external face of the vane.

17 . The hollow vane according to claim 16 , wherein said oblique edges form lower angles more preferably at 5° with directions perpendicular to the external face of the vane.

18 . The hollow vane according to claim 16 , wherein said oblique edges of the opening and of the cover form different angles with directions perpendicular to the external face of the vane, at least to one of the sides of the opening.

19 . The hollow vane according to claim 11 , wherein the cover fully occupies the opening of the main portion, is connected to the main portion by nested anchoring, and was produced by moulding in the opening.

20 . A method of producing a hollow vane, the vane comprising a main portion and at least one cover, the cover being mounted in an opening of the main portion in such a way as to close the opening and to form with the main portion an external, substantially continuous face of the vane, the main portion further comprising a cavity that communicates with the external face via the opening, and the cover comprises at least one protrusion, extending over a portion of a thickness of the cover at a distance from the external face, and over opposite portions of the edge of the cover, and the main portion comprises at least one widening of the opening, located at a distance from the external face and wherein the protrusion of the cover penetrates,
the method comprising: dilating the main portion of the vane relative to the cover thanks to a difference in temperature between the main portion and the cover, with this difference in temperature being created by a heating of the main portion and/or a cooling of the cover; traducing the cover into the opening without the protrusion penetrating into the widening; and stopping the dilating of the main portion of the vane in order to allow it to retract on the cover and to allow the widening to adjust around the protrusion.

Assignees

• Snecma

Inventors

• Fribourg Guillaume
• Delaleau Pierre
• Tellier Florian

Classifications

• B23P11/025 Primary

  by using heat or cold · CPC title

• F05D2300/43

  Synthetic polymers, e.g. plastics; Rubber · CPC title

• F05D2240/12

  Fluid guiding means, e.g. vanes · CPC title

• F01D9/041 Primary

  using blades (F01D5/148 takes precedence) · CPC title

• F05D2300/502

  Thermal properties · CPC title