US3709632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade tip closure
Assignee: Motors Liquidation Co
•
Filing: 1971-02-12
•
Granted: 1973-01-09
•
Expires: 1991-02-12
Abstract
Abstract A hollow laminated sheet metal transpiration-cooled porous turbine blade has its free end closed to prevent escape of cooling fluid from the end of the blade. This closure is made by separating the inner layer of the blade wall from the other layers and bending it inward from each face of the blade so that the inner layers from each face of the blade meet approximately along the mean camber line of the blade, where they are welded together to provide the closure. The closure is spaced from the blade tip, located within the cooled blade walls.
Inventors
- 👤 C Emmerson
- 👤 R Schwedland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/182; F01D5/184
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
A turbine blade or the like comprising a hollow airfoil closed at one end and having two faces, the airfoil being defined by a wall of formed laminated sheet metal of a porous character adapted for flow of a cooling fluid into the open end of the airfoil and out through the wall for transpiration cooling of the airfoil, the wall comprising an inner layer and one or more layers exterior to the inner layer, the layers being bonded together over the major portion of the wall, the end portion of the inner layer of each face at the closed end of the airfoil being free from the othEr layers and being formed into a closure in the form of an arch of generally semicircular cross-section extending from one face to the other defined by the said end portions of the inner layer extending inwardly from each face into sealed butt joined contact with the said end portions of the inner layer of the other face.
Claim 2
Dependent Claim
166 words
A turbine blade or the like comprising a hollow airfoil closed at one end and having two faces, the airfoil being defined by a wall of formed laminated sheet metal of a porous character adapted for flow of a cooling fluid into the open end of the airfoil and out through the wall for transpiration cooling of the airfoil, the wall comprising an inner layer and one or more layers exterior to the inner layer, the layers being bonded together over the major portion of the wall, the end portion of the inner layer of each face at the closed end of the airfoil being free from the othEr layers and being formed into a closure in the form of an arch of generally semicircular cross-section extending from one face to the other defined by the said end portions of the inner layer extending inwardly from each face into sealed butt joined contact with the said end portions of the inner layer of the other face.
Claim 3
Dependent Claim
202 words
A turbine blade or the like comprising a hollow airfoil closed at one end and having two faces, the airfoil being defined by a wall of formed laminated sheet metal of a porous character adapted for flow of a cooling fluid into the open end of the airfoil and out through the wall for transpiration cooling of the airfoil, the wall comprising an inner layer and one or more layers exterior to the inner layer, the layers being bonded together over the major portion of the wall, the end portion of the inner layer of each face at the closed end of the airfoil being free from the other layers and being formed into a closure in the form of an arch of generally semicircular cross-section extending from one face to the other defined by the said end portions of the inner layer extending inwardly from each face into sealed butt joined contact with the said end portions of the inner layer of the other face, the wall including a continuous sealing bond between the inner layer and the next adjacent layer at the closure to prevent leakage of the cooling fluid into the end of the airfoil between the said layers.
Claim 4
Dependent Claim
202 words
A turbine blade or the like comprising a hollow airfoil closed at one end and having two faces, the airfoil being defined by a wall of formed laminated sheet metal of a porous character adapted for flow of a cooling fluid into the open end of the airfoil and out through the wall for transpiration cooling of the airfoil, the wall comprising an inner layer and one or more layers exterior to the inner layer, the layers being bonded together over the major portion of the wall, the end portion of the inner layer of each face at the closed end of the airfoil being free from the other layers and being formed into a closure in the form of an arch of generally semicircular cross-section extending from one face to the other defined by the said end portions of the inner layer extending inwardly from each face into sealed butt joined contact with the said end portions of the inner layer of the other face, the wall including a continuous sealing bond between the inner layer and the next adjacent layer at the closure to prevent leakage of the cooling fluid into the end of the airfoil between the said layers.
References Cited (Backward Citations)
CA585774A
Cited
FR591117A
Cited
US2620885A
Cited
US2851216A
Cited
US3584972A
Cited
US3446480A
Cited
US3619082A
Cited
US3560107A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |