Extended banana foot stator
AssigneePratt & Whitney Canada Corp.
InventorsTibor Urac, Richard Ivakitch, Piotr Szczesnowicz
Life of this patent
Estimating the term…
Abstract
A stator vane is provided and includes an airfoil section, a banana foot section including a radially outermost surface and a fillet. The fillet is radially interposed between the radially outermost surface of the banana foot section and the airfoil section. Respective outermost peripheries of the fillet and the radially outermost surface of the banana foot section define first and second footprints, respectively, in corresponding axial and circumferential dimensions. At least a section of the second footprint extends beyond a corresponding section of the first footprint in at least one of the corresponding axial and circumferential dimensions.
Claims11
A stator stage, comprising:
- a shroud defining an opening;
- and
- a stator vane, the stator vane comprising:
- an airfoil section;
- a banana foot section fittable in the opening and comprising a radially outermost surface;
- braze material interposable between the radially outermost surface and corresponding sidewalls of the opening with the banana foot section fit in the opening;
- and
- a fillet radially interposed between the radially outermost surface of the banana foot section and the airfoil section,
- wherein:
- respective outermost axial and circumferential peripheries of the fillet and the radially outermost surface of the banana foot section defining first and second footprints, respectively, in corresponding axial and circumferential dimensions, and
- the opening and the banana foot section being sized such that at least a section of the second footprint extends beyond a corresponding section of the first footprint in at least one of the corresponding axial and circumferential dimensions and such that, during a brazing process to secure the banana foot section in the opening, the braze material is prevented from flowing up and onto the fillet.
A method of assembling a stator stage, the method comprising:
- forming a shroud defining an opening;
- forming a stator vane to comprise an airfoil section and a banana foot section fittable in the opening and comprising a radially outermost surface, which, with the banana foot section fit in the opening, forms a gap between the radially outermost surface and corresponding sidewalls of the opening;
- machining a portion of the stator vane into a fillet radially interposed between the radially outermost surface of the banana foot section and the airfoil section;
- sizing the opening and the banana foot section such that at least a section of a footprint of the radially outermost surface of the banana foot section extends beyond a corresponding section of a footprint of the fillet in at least one of axial and circumferential dimensions;
- inserting the banana foot section into the opening;
- interposing braze material in the gap between the radially outermost surface and the corresponding sidewalls of the opening;
- and
- executing brazing to secure the banana foot section in the opening,
- wherein the sizing is executed such that melted braze material is prevented from flowing up and onto the fillet during the executing of the brazing.
Dependencies are inferred from the claim text.