US3796513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High damping blades
Assignee: Westinghouse Electric Corp
•
Filing: 1972-06-19
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Granted: 1974-03-12
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Expires: 1992-06-19
Abstract
Abstract A rotating turbine blade having an elongated depression disposed lengthwise along a concave surface forming an airfoil shaped portion of the blade and a high damping material disposed in the depression to produce a high strength blade with good damping characteristics.
Inventors
- 👤 O Jonas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:21
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/16; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A rotatable blade for an elastic fluid machine having a rotor, said blade being formed of a high strength material and comprising a root portion which fastens to said rotor, and a airfoil shaped portion which extends radially from said rotor portion and has a concave and convex portion; said concave portion having an elongated depression disposed lengthwise therein, said depression terminating radially outwardly from the root portion, said depression having a high damping material disposed therein, whereby the vibration of the blade is dampened, while the strength of the blade is not materially altered.
Claim 2
Dependent Claim
95 words
A rotatable blade for an elastic fluid machine having a rotor, said blade being formed of a high strength material and comprising a root portion which fastens to said rotor, and a airfoil shaped portion which extends radially from said rotor portion and has a concave and convex portion; said concave portion having an elongated depression disposed lengthwise therein, said depression terminating radially outwardly from the root portion, said depression having a high damping material disposed therein, whereby the vibration of the blade is dampened, while the strength of the blade is not materially altered.
Claim 3
Dependent Claim
26 words
A rotatable blade as set forth in claim 1, wherein the high damping material is so disposed in the depression to provide a continuous concave surface.
Claim 4
Dependent Claim
38 words
A blade as set forth in claim 1, wherein the root end of the depression gradually reduces in depth as it approaches the root, thereby eliminating stress concentrations resulting from the formation of the depression in the blade.
Claim 5
Dependent Claim
26 words
A blade as set forth in claim 1, wherein the blade is formed from an alloy steel and the damping material is a magnesium copper alloy.
Claim 6
Dependent Claim
18 words
A blade as set forth in claim 1, wherein the damping material is a nickel chrome iron alloy.
References Cited (Backward Citations)
FR710766A
Cited
US2394124A
Cited
US2917274A
Cited
US3357850A
Cited
US3294366A
Cited
US3327995A
Cited
US3301530A
Cited
US3368795A
Cited
US3660882A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |