US3635585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-cooled turbine blade
Assignee: Westinghouse Electric Corp
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Filing: 1969-12-23
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Granted: 1972-01-18
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Expires: 1989-12-23
Abstract
Abstract A cooled turbine blade for gas turbines and the like having passageways for conducting a relatively cool fluid through the blade to its tip and incorporating a walled cavity at the tip of the blade. The wall of the cavity has a cutaway portion which permits the cooling fluid to discharge into a main gas stream through the turbine at the area of lowest pressure on the blade surfaces. This permits the flow of fluid from the discharge orifices of the passageways to be more uniform from the leading to the trailing edge of the blade and reduces the required gas pressure on the entire cooling system.
Inventors
- 👤 Charles Walter Metzler Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:05
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F01D5/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
155 words
In a turbine blade of the type having a root portion, a tip portion, leading and trailing edge portions, a low-pressure surface extending between said leading and trailing edges, a high-pressure surface continuous with said low-pressure surface and extending between said leading and trailing edges, and a plurality of passages of uniform cross-sectional area extending from said root portion to said tip portion of the blade for conducting a cooling fluid through the blade; the improvement comprising a walled cavity at the outermost tip portion of said blade having a bottom at which said passages terminate and a cutaway portion in its wall extending between said trailing edge and a point on said low-pressure side which permits the cooling fluid to discharge into the main gas stream through the turbine at the point of substantially lowest pressure on the blade surfaces, and said wall being a continuous extension of the outer high-pressure and low-pressure surfaces.
Claim 2
Dependent Claim
155 words
In a turbine blade of the type having a root portion, a tip portion, leading and trailing edge portions, a low-pressure surface extending between said leading and trailing edges, a high-pressure surface continuous with said low-pressure surface and extending between said leading and trailing edges, and a plurality of passages of uniform cross-sectional area extending from said root portion to said tip portion of the blade for conducting a cooling fluid through the blade; the improvement comprising a walled cavity at the outermost tip portion of said blade having a bottom at which said passages terminate and a cutaway portion in its wall extending between said trailing edge and a point on said low-pressure side which permits the cooling fluid to discharge into the main gas stream through the turbine at the point of substantially lowest pressure on the blade surfaces, and said wall being a continuous extension of the outer high-pressure and low-pressure surfaces.
Claim 3
Dependent Claim
27 words
The improvement of claim 1 wherein said point is opposite the trailing edge of a next successive turbine blade when said blades are assembled on a rotor.
Claim 4
Dependent Claim
55 words
The improvement of claim 1 wherein the area between the point on said low-pressure side where said wall terminates and the opposite wall on the high-pressure side of the blade is substantially greater than the combined areas of the cross sections of the passages upstream of said point between said point and said leading edge.
Claim 5
Dependent Claim
26 words
The improvement of claim 1 wherein said blade is of airfoil construction with a rounded leading edge portion of greater radius than the trailing edge portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |