US4295786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite seal for turbomachinery
Assignee: National Aeronautics and Space Administration
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Filing: 1979-11-20
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Granted: 1981-10-20
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Expires: 1999-11-20
Abstract
Abstract A gas path seal suitable for use with a turbine engine or compressor is provided. A shroud wearable or abradable by the abrasion of the rotor blades of the turbine or compressor shrouds the rotor blades. A compliant backing surrounds the shroud. The backing is a yieldingly deformable porous material covered with a thin ductile layer. A mounting fixture surrounds the backing.
Inventors
- 👤 Robert C. Bill
- 👤 Lawrence P. Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:41
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/44; F16J15/441; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A gas path seal for a turbine or the like having a plurality of blades mounted for rotation about an axis comprising a stator shroud having an aerodynamic smooth surface on a thin layer of a deformable metallic material that is wearable relative to said blades and closely spaced to the blade tips whereby said shroud is deformed when said blades rub against said surface, a yieldingly deformable porous backing surrounding said layer to receive said deformed shroud thereby reducing said blade wear by limiting the magnitude of normal forces measured radially inward which are developed between the blade tips and the shroud, and a rigid mounting housing surrounding said backing and being secured to the outermost surface of said backing.
Claim 2
Dependent Claim
121 words
A gas path seal for a turbine or the like having a plurality of blades mounted for rotation about an axis comprising a stator shroud having an aerodynamic smooth surface on a thin layer of a deformable metallic material that is wearable relative to said blades and closely spaced to the blade tips whereby said shroud is deformed when said blades rub against said surface, a yieldingly deformable porous backing surrounding said layer to receive said deformed shroud thereby reducing said blade wear by limiting the magnitude of normal forces measured radially inward which are developed between the blade tips and the shroud, and a rigid mounting housing surrounding said backing and being secured to the outermost surface of said backing.
Claim 3
Dependent Claim
12 words
The combination as claimed in claim 1, said shroud being substantially cylindrical.
Claim 4
Dependent Claim
13 words
The combination as claimed in claim 2, said mounting housing being also cylindrical.
Claim 5
Dependent Claim
14 words
The combination as claimed in claim 1, said yieldingly deformable porous backing being metal.
Claim 6
Dependent Claim
16 words
The combination as claimed in claim 4, said metallic backing material comprising a thermal sprayed layer.
Claim 7
Dependent Claim
15 words
The combination as claimed in claim 5, said metallic backing material comprising porous sintered metal.
Claim 8
Dependent Claim
18 words
The combination as claimed in claim 1, said yieldingly deformable backing material comprising a gas blown plastic material.
Claim 9
Dependent Claim
18 words
The combination as claimed in claim 1, said stator shroud material comprising a dense plasma sprayed aluminum layer.
Claim 10
Dependent Claim
13 words
The combination as claimed in claim 1, said shroud material comprising sheet metal.
Claim 11
Dependent Claim
13 words
The combination as claimed in claim 9, said shroud material comprising aluminum foil.
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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |