Patent US3690160A successfully refreshed from Google Patents.
US3690160A
Expired / Lapsed
US
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Apparatus for testing the blade anchorage of turbine blades
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1970-04-08
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Granted: 1972-09-12
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Expires: 1990-04-08
Abstract
Abstract An improved testing apparatus for determining tightness, deformations and weak points of the blade anchorage of a turbine blade. The apparatus operates by applying forces to a blade or portion thereof which includes a blade base, attached in the normal fashion to a simulated portion of a turbine rotor. A force in a direction corresponding to the radial direction in a turbine rotor and hence to the centrifugal force in a rotating rotor is applied by attaching the blade and rotor portion to respective first and second yokes and drawing the blade and rotor portions apart. A force corresponding to the damping forces in the axial and/or tangential directions of a turbine rotor is applied by an additional device while the blade and rotor portions are held in the yokes. At least one end of the blade is mounted on its respective yoke by means of fluid pressure bearing system whereby the various forces can be applied to the blade in a substantially frictionless manner.
Inventors
- 👤 Horst Kriesten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:14
CPC Classifications
G; G01; G01M; G01M13/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
In a testing apparatus for determining the fit, deformations and weak points of the blade base of a turbine blade of the type having a frame having a pair of spaced yokes, means, including a simulated turbine rotor segment, for fastening at least the portion of a turbine blade with the blade base between the two yokes with said blade base being connected to one of said yokes via said simulated rotor segment, means for exerting a force on said simulated rotor segment and rotor blade corresponding in direction and magnitude to the centrifugal force acting on a rotating blade of a rotor segment, and means for exerting forces on the blade corresponding to damping forces acting on a rotating rotor blade in the axial and tangential directions of a turbine rotor, the improvement wherein one end of said blade is fastened to its respective yoke by means of a pressurized fluid bearing system so that said one end is freely suspended and the said forces can be applied to the blade in a substantially frictionless manner.
Claim 2
Dependent Claim
177 words
In a testing apparatus for determining the fit, deformations and weak points of the blade base of a turbine blade of the type having a frame having a pair of spaced yokes, means, including a simulated turbine rotor segment, for fastening at least the portion of a turbine blade with the blade base between the two yokes with said blade base being connected to one of said yokes via said simulated rotor segment, means for exerting a force on said simulated rotor segment and rotor blade corresponding in direction and magnitude to the centrifugal force acting on a rotating blade of a rotor segment, and means for exerting forces on the blade corresponding to damping forces acting on a rotating rotor blade in the axial and tangential directions of a turbine rotor, the improvement wherein one end of said blade is fastened to its respective yoke by means of a pressurized fluid bearing system so that said one end is freely suspended and the said forces can be applied to the blade in a substantially frictionless manner.
Claim 3
Dependent Claim
177 words
The testing apparatus as defined in claim 1 wherein at least a portion of the outer surface of the yoke associated with said pressurized fluid bearing system has a rounded contour; wherein said fluid bearing system comprises a tilting pad having a rounded surface corresponding to and juxtaposed said rounded portion of said yoke, a rotary plate disposed adjacent the surface of said tilting pad opposite its rounded surface, said tilting pad and said rotary plate being provided with central bores, fluid passage means formed within at least said tilting pad for directing the pressurized fluid between the adjacent surfaces of said yoke and said tilting pad and between the adjacent surfaces of said tilting pad and said rotary plate causing fluid cushions to be formed between said adjacent surfaces; and wherein said blade is coupled to said fluid bearing system by means of a rod which extends through an opening in said yoke and through said central bores in said tilting pad and said rotary plate, and, locking means connected to the end of said rod.
Claim 4
Dependent Claim
28 words
The testing apparatus as defined in claim 2 wherein the end of said blade supported by said fluid pressure bearing system is the end opposite the blade base.
Claim 5
Dependent Claim
31 words
The testing apparatus as defined in claim 3 wherein said damping forces applying means applies said forces to the blade adjacent the end thereof supported by said fluid pressure bearing system.
Claim 6
Dependent Claim
32 words
The testing apparatus as defined in claim 3 including a knIfe-edge bearing engaging the outer surface of said rotary plate, said knife-edge bearing having a central bore through which said rod extends.
References Cited (Backward Citations)
US3176507A
Cited
US3603143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |