US3795462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration dampening for long twisted turbine blades
Assignee: Westinghouse Electric Corp
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Filing: 1971-08-09
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Granted: 1974-03-05
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Expires: 1991-08-09
Abstract
Abstract Lashing long twisted turbine blades in groups with a small Vshaped gap between the groups, which tends to close due to the untwisting of the blades, when they are subjected to high centrifugal forces, provides a substantially continuous lashing ring with good vibration dampening characteristics, which is sufficiently flexible to allow for thermal expansion and contraction, and cooperates with the vibration reducing characteristic of joining the blades into groups to minimize stress vibrations in such blades.
Inventors
- 👤 W Trumpler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
An annular array of circumferentially spaced twisted blades fastened to a rotor, said blades being joined together into integral groups by a segmented ring which is integral with a plurality of blades, and which is generally of uniform cross section in each group, there being a small gap between adjacent segments of said ring, said gap being generally V-shaped, the V generally opening in the direction of the rotation of the blade, the V having legs which extend to the ring''s margins, and the downstream leg of the V being shorter than an upstream leg thereof, so that only a small portion thereof adjacent one side thereof closes as the blades are rotated and tend to untwist as a group, thereby providing A substantially continuous interlocking segmented ring, which cooperates with the blade grouping to reduce vibration and to allow for thermal expansion and elastic deformation of said rotor.
Claim 2
Dependent Claim
149 words
An annular array of circumferentially spaced twisted blades fastened to a rotor, said blades being joined together into integral groups by a segmented ring which is integral with a plurality of blades, and which is generally of uniform cross section in each group, there being a small gap between adjacent segments of said ring, said gap being generally V-shaped, the V generally opening in the direction of the rotation of the blade, the V having legs which extend to the ring''s margins, and the downstream leg of the V being shorter than an upstream leg thereof, so that only a small portion thereof adjacent one side thereof closes as the blades are rotated and tend to untwist as a group, thereby providing A substantially continuous interlocking segmented ring, which cooperates with the blade grouping to reduce vibration and to allow for thermal expansion and elastic deformation of said rotor.
Claim 3
Dependent Claim
34 words
An annular array of blades as set forth in claim 1, wherein the blades are joined in groups by concentric segmented rings with a small gap in each ring between adjacent groups of blades.
Claim 4
Dependent Claim
17 words
An annular array of blades as set forth in claim 2, wherein the rings are lashing rings.
Claim 5
Dependent Claim
35 words
An annular array of blades as set forth in claim 1, wherein the ring is disposed adjacent the outer periphery of the annular array of blades and each group has at least three blades therein.
References Cited (Backward Citations)
US1304793A
Cited
US1639247A
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US2283901A
Cited
US2391623A
Cited
US2510734A
Cited
FR69842E
Cited
US3572970A
Cited
US3588278A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |