US4827587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating an air cooled turbine blade
Assignee: RTX Corp
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Filing: 1988-01-25
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Granted: 1989-05-09
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Expires: 2008-01-25
Abstract
Abstract A turbine blade is formed from an airfoil blade 10 having V-grooves 12 in the outer surface and indentations 26 in the inner surface. A slot 30 is machined at the root of the groove intersecting the slots, and providing a smooth flow path for the cooling air discharging along the blade surface.
Inventors
- 👤 Kenneth B. Hall
- 👤 Kenneth K. Landis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:11
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/186; A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/55; A61K45/00; A61K45/06; B; B23; B23P; B23P15/00; B23P15/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341; Y10T29/4998; Y10T29/49988; Y10T29/49989
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
132 words
A method of manufacturing a hollow air cooled longitudinally extending airfoil turbine blade, comprising: casting an airfoil blank having an outer surface and an inner surface defining a cooling air flow plenum; forming on said outer surface longitudinally extending skewed V-grooves having a first groove surface substantially perpendicular to said outer surface and a second groove surface at an angle less than 20 degrees from said outer surface in the direction away from said first groove surface; forming a plurality of outwardly extending indentations in said inner surface at a location adjacent to said V-grooves on the first groove surface side of said V-groove; and forming a longitudinally extending slot through said first groove surface substantially parallel to and coextensive with said second groove surface of a depth to intersect said indentations.
Claim 2
Independent Claim
132 words
A method of manufacturing a hollow air cooled longitudinally extending airfoil turbine blade, comprising: casting an airfoil blank having an outer surface and an inner surface defining a cooling air flow plenum; forming on said outer surface longitudinally extending skewed V-grooves having a first groove surface substantially perpendicular to said outer surface and a second groove surface at an angle less than 20 degrees from said outer surface in the direction away from said first groove surface; forming a plurality of outwardly extending indentations in said inner surface at a location adjacent to said V-grooves on the first groove surface side of said V-groove; and forming a longitudinally extending slot through said first groove surface substantially parallel to and coextensive with said second groove surface of a depth to intersect said indentations.
Claim 3
Dependent Claim
21 words
The method of claim 1 including; rounding the edge of the intersection of said second groove surface with said outer surface.
Claim 4
Dependent Claim
28 words
The method of claim 2 including: rounding the edge of the intersection between said second groove surface and said outer surface to a radius greater than 25 mils.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein: the step of forming on said outer surface longitudinally extending skewed V-grooves comprises casting said grooves in said blank.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the step of forming a plurality of outwardly extending indentations comprising casting said indentations in said blank.
Claim 7
Dependent Claim
34 words
The method of claim 1 wherein the step of forming a longitudinally extending slot comprises: machining a slot in a plurality of longitudinally extending segments leaving a land of blade material between adjacent segments.
Claim 8
Dependent Claim
52 words
The method of claim 1 wherein the step of forming a longitudinally extending slot comprises: machining said slot of a width with respect to the depth of said first groove surface within 3 mils of said outer surface whereby the edge of the remaining material does not exceed 3 mils in thickness.
Claim 9
Dependent Claim
29 words
The method of claim 1 including: casting said airfoil blank with a step change from a hypothetical continuous extension of said airfoil surface at the location of said grooves.
Claim 10
Dependent Claim
18 words
The method of claim 8 including: forming said blank with a step change between 2 and 10 mils.
Claim 11
Dependent Claim
18 words
The method of claim 1 wherein the step of forming a longitudinally extending slot comprises: machining said slot.
Claim 12
Independent Claim
159 words
A method of manufacturing a hollow air cooled longitudinally extending airfoil turbine blade, comprising: casting an airfoil blank having an outer surface and an inner surface defining a cooling air flow plenum; casting in said outer surface longitudinally extending skewed V-grooves having a first groove surface substantially perpendicular to said outer surface and a second groove surface at an angle less than 20 degrees from said outer surface in the direction away from said first groove surface; casting a plurality of outwardly extending indentations in said inner surface at a location adjacent to said V-grooves on the first groove surface side of said V-groove; and forming a longitudinally extending slot in a plurality of longitudinally extending segments leaving a land of blade material between adjacent segments, said slots being of a width less than the width of said first groove surface and substantially parallel to and coextensive with said second groove surface of a depth to intersect said indentations.
Claim 13
Independent Claim
159 words
A method of manufacturing a hollow air cooled longitudinally extending airfoil turbine blade, comprising: casting an airfoil blank having an outer surface and an inner surface defining a cooling air flow plenum; casting in said outer surface longitudinally extending skewed V-grooves having a first groove surface substantially perpendicular to said outer surface and a second groove surface at an angle less than 20 degrees from said outer surface in the direction away from said first groove surface; casting a plurality of outwardly extending indentations in said inner surface at a location adjacent to said V-grooves on the first groove surface side of said V-groove; and forming a longitudinally extending slot in a plurality of longitudinally extending segments leaving a land of blade material between adjacent segments, said slots being of a width less than the width of said first groove surface and substantially parallel to and coextensive with said second groove surface of a depth to intersect said indentations.
Claim 14
Independent Claim
176 words
A method of manufacturing a hollow air cooled longitudinally extending airfoil turbine blade, comprising: casting an airfoil blank having an outer surface and an inner surface defining a cooling air flow plenum; casting in said outer surface longitudinally extending skewed V-grooves having a first groove surface substantially perpendicular to said outer surface and a second groove surface at an angle less than 20 degrees from said outer surface in the direction away from said first groove surface, with a step change from a hypothetical continuous extension of said airfoil surface at the location of said grooves; forming a plurality of outwardly extending indentations in said inner surface at a location adjacent to said V-grooves on the first groove surface side of said V-groove; and forming a longitudinally extending slot in a plurality of segments leaving a land of blade material between adjacent segments, said slots being of a width less than the width of said first groove surface and substantially parallel to and coextensive with said second groove surface of a depth to intersect said indentations.
Claim 15
Independent Claim
176 words
A method of manufacturing a hollow air cooled longitudinally extending airfoil turbine blade, comprising: casting an airfoil blank having an outer surface and an inner surface defining a cooling air flow plenum; casting in said outer surface longitudinally extending skewed V-grooves having a first groove surface substantially perpendicular to said outer surface and a second groove surface at an angle less than 20 degrees from said outer surface in the direction away from said first groove surface, with a step change from a hypothetical continuous extension of said airfoil surface at the location of said grooves; forming a plurality of outwardly extending indentations in said inner surface at a location adjacent to said V-grooves on the first groove surface side of said V-groove; and forming a longitudinally extending slot in a plurality of segments leaving a land of blade material between adjacent segments, said slots being of a width less than the width of said first groove surface and substantially parallel to and coextensive with said second groove surface of a depth to intersect said indentations.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |