Advanced firtree and broach slot forms for turbine stage 3 buckets and rotor wheels
US8079817B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2004 |
| Grant date | Dec 20, 2011 |
| Priority date | — |
| Expiry date | Feb 15, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2220/3213
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A turbine bucket and wheelpost assembly reduces the number of buckets in the third stage of the turbine from ninety-two to ninety while reducing stresses at the assembly points of the buckets and wheelposts. The buckets and wheelposts are formed with complementary fillets and tangs that provide for the insertion of the bucket into the broach slot between two wheelposts. The angles of the fillets on both the bucket and wheelpost range from 50° to 59°. The upper surface of the wheelpost is scalloped to reduce weight and the tangs and fillets of both the bucket and wheelpost are formed from curved and straight surfaces to reduce stresses on the assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.