Patent US4416585A successfully refreshed from Google Patents.
US4416585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade cooling for gas turbine engine
Assignee: Pratt and Whitney Canada Corp
•
Filing: 1981-08-12
•
Granted: 1983-11-22
•
Expires: 2001-08-12
Abstract
Abstract A hollow blade for a turbine in a gas turbine engine comprising passageways in the hollow blade for passing a coolant therethrough and pairs of ridges having a chevron shape and being segmented form a channel therebetween with corresponding pairs on opposed side walls of the passageway such that each corresponding opposed pair has the chevron angle open in opposite directions relative to the longitudinal direction of the passageway. In another embodiment the opposed pairs of ridges are in the same phase, that is with the angle open in the same direction.
Inventors
- 👤 William Abdel-Messeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:16
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/221; F05D2260/2212
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A blade for use in a gas turbine engine comprising hollow passageways in the blade for passing a coolant therethrough in a direction parallel to the axis of the passageway, the passageway including opposed walls, at least one of the walls having longitudinally spaced-apart pairs of ridges formed on said wall, each ridge in a pair being spaced apart to form a gap and defining an angle θ therebetween and each ridge defining an angle φ to the axis of the passageway, and wherein: θ=2φ≧π/2; each ridge having a height E and the passageway having a width H between the opposed walls wherein the ratio E/H is within the range of 0.04 and 0.333.
Claim 2
Dependent Claim
114 words
A blade for use in a gas turbine engine comprising hollow passageways in the blade for passing a coolant therethrough in a direction parallel to the axis of the passageway, the passageway including opposed walls, at least one of the walls having longitudinally spaced-apart pairs of ridges formed on said wall, each ridge in a pair being spaced apart to form a gap and defining an angle θ therebetween and each ridge defining an angle φ to the axis of the passageway, and wherein: θ=2φ≧π/2; each ridge having a height E and the passageway having a width H between the opposed walls wherein the ratio E/H is within the range of 0.04 and 0.333.
Claim 3
Dependent Claim
74 words
A blade as defined in claim 1, wherein there are provided longitudinally spaced-apart pairs of ridges on opposed walls of the passageway with a corresponding pair located directly opposite on the other of the opposed walls to each of the pairs on the one wall, each opposed corresponding pair on the other opposed wall having its angle θ facing in a direction opposite to the angle θ of the pair on the one wall.
Claim 4
Dependent Claim
21 words
A blade as defined in claims 1 or 2, wherein the angle θ is in the range of 140° to 160°.
Claim 5
Dependent Claim
15 words
A blade as defined in claims 1 or 2, wherein the angle θ is 150°.
Claim 6
Dependent Claim
110 words
A blade as defined in claim 1, wherein the passageway is defined adjacent the leading edge of the blade and parallel to the leading edge for the complete length of the leading edge, and the passageway continues in a serpentine manner within the blade and communicates with exhaust ports at the trailing edge of the blade, and pairs of ridges are spaced longitudinally of the direction of the passageway at least for the complete portion of the passageway adjacent the leading edge of the blade, and opposed pairs of ridges are provided with a corresponding pair on each side wall adjacent the leading edge of the blade in the passageway.
Claim 7
Dependent Claim
19 words
A blade as defined in claim 5, wherein ridges are provided past a first bend in the serpentine passageway.
Claim 8
Dependent Claim
29 words
A blade as defined in claim 1, wherein the height of each ridge is 0.010" and the width of the passageway between opposed side walls between 0.030" to 0.25".
Claim 9
Dependent Claim
74 words
A blade as defined in claim 1, wherein there are provided longitudinally spaced apart pairs of ridges on opposed walls of the passageways with a corresponding pair located in a staggered manner relative to the longitudinal spacing of the ridges on the one wall and each opposed corresponding pair on the other opposed wall having its angle θ facing in a direction similar to the angle φ of the pair on the one wall.
Claim 10
Dependent Claim
13 words
A blade as defined in claim 1, wherein the gap is 0.010" wide.
Claim 11
Dependent Claim
24 words
A blade as defined in claim 1, wherein the gaps between the pairs of ridges are aligned coaxially with the axis of the passageway.
Claim 12
Dependent Claim
13 words
A blade as defined in claim 1, wherein the ratio E/H is 0.10.
References Cited (Backward Citations)
US2956773A
Cited
US3171631A
Cited
US3628885A
Cited
GB1355558A
Cited
GB1410019A
Cited
US4236870A
Cited
US4278400A
Cited
US4302153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |