Tuning thermal mismatch between turbine rotor parts with a thermal medium
US6190127A · kind A · utility
39Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D5/088
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a turbine rotor, an aft shaft wheel and the final-stage wheel of the rotor are coupled together, including by a rabbeted joint. During shutdown and startup of the turbine, a thermal mismatch between the aft shaft wheel and final-stage wheel is avoided by respectively heating and cooling the aft shaft wheel to maintain the thermal mismatch within acceptable limits, thereby avoiding opening of the rabbeted joint and the potential for unbalancing the rotor and rotor vibration. The thermal medium may be supplied by piping in the aft bearing cavity into the cavity between the forward closure plate and the aft shaft wheel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.