Finger dovetail attachment between a turbine rotor wheel and bucket for stress reduction
US7387494B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2005 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Apr 5, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2260/941
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A bucket to wheel dovetail attachment includes axially spaced radially extending wheel fingers having discrete sections of decreased axial thickness in a radial outward direction with transition fillets between sections of different thicknesses. The wheel fingers define wheel finger slots for receiving correspondingly shaped bucket dovetail fingers. Pins interconnect the buckets and rotor wheel. The slot bottoms likewise have fillets. The fillets on the wheel fingers and slot bottoms have a blend of different radii with the larger radii outward of the smaller radii to reduce stress concentrations and to avoid stress corrosion cracking in steam turbine applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.