Patent US3730640A successfully refreshed from Google Patents.
US3730640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seal ring for gas turbine
Assignee: RTX Corp
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Filing: 1971-06-28
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Granted: 1973-05-01
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Expires: 1991-06-28
Abstract
Abstract A gas turbine blade tip ring seal, which surrounds the blade tips to minimize turbine gas leakage around the blades, that incorporates a thermal protection system that allows modulation of the seal leading edge temperature level and thermal response to minimize seal deterioration during turbine transient operating conditions.
Inventors
- 👤 A Rice
- 👤 H Pedersen
- 👤 V Iverson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:27
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
108 words
The combination with a row of turbine vanes having outer shrouds, a casing surrounding the outer shrouds and supporting said row of vanes, a row of turbine blades downstream of and adjacent to said vanes and a continuous seal ring extending around the tips of the blades in close proximity thereto and supported within said casing, said seal ring also projecting forwardly of the tips of the blades, of a shield extending downstream of and separate from the shrouds and substantially in alignment therewith and overlying at least a part of the seal ring for shielding said ring from the hot gases passing over the vanes and blades.
Claim 2
Dependent Claim
108 words
The combination with a row of turbine vanes having outer shrouds, a casing surrounding the outer shrouds and supporting said row of vanes, a row of turbine blades downstream of and adjacent to said vanes and a continuous seal ring extending around the tips of the blades in close proximity thereto and supported within said casing, said seal ring also projecting forwardly of the tips of the blades, of a shield extending downstream of and separate from the shrouds and substantially in alignment therewith and overlying at least a part of the seal ring for shielding said ring from the hot gases passing over the vanes and blades.
Claim 3
Dependent Claim
16 words
The combination as in claim 1 in which the shield extends substantially to the blade tips.
Claim 4
Dependent Claim
25 words
The combination as in claim 1 in which means are provided for discharging cooling air into the space between the seal ring and the shield.
Claim 5
Dependent Claim
34 words
The combination as in claim 1 in which the seal ring extends upstream substantially to the shrouds and the shield overlies this portion of ring and extends substantially to the tips of the blades.
Claim 6
Dependent Claim
113 words
The combination with a row of turbine vanes having outer shrouds, a row of turbine blades downstream of and adjacent to said vanes, a casing surrounding said vanes and blades and supporting said vanes, and a continuous seal ring extending around the tips of the blades in close proximity thereto and also projecting forwardly of the tips of the blades substantially to the vane shrouds, said seal ring being supported by the casing for radial movement relative thereto, of a shield extending downstream of and separate from the shrouds and substantially in alignment therewith and overlying the portion of the seal ring between the vane shrouds and blade tips for shielding said ring.
Claim 7
Dependent Claim
113 words
The combination with a row of turbine vanes having outer shrouds, a row of turbine blades downstream of and adjacent to said vanes, a casing surrounding said vanes and blades and supporting said vanes, and a continuous seal ring extending around the tips of the blades in close proximity thereto and also projecting forwardly of the tips of the blades substantially to the vane shrouds, said seal ring being supported by the casing for radial movement relative thereto, of a shield extending downstream of and separate from the shrouds and substantially in alignment therewith and overlying the portion of the seal ring between the vane shrouds and blade tips for shielding said ring.
Claim 8
Dependent Claim
40 words
The combination as in claim 5 in which the casing has an inwardly extending flange for supporting the shield, said flange having means therein for directing cooling fluid to the outer surface of the upstream end of the seal ring.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |