Axial flow steam turbine assembly
US7387486B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2005 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Dec 15, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2300/502
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
One turbine, e.g. a high pressure (HP) turbine, has a conventional diaphragm and disc structure with impulse turbine stages. A preceding or following turbine, e.g. an intermediate (IP) turbine, on a common axis and on the same steam path, has a rotor drum which carries an annular row of moving blades having root portions held within a slot in the periphery of the drum. A turbine casing surrounds the drum and carries a static blade assembly with an annular row of static blades which, together with the annular row of moving blades, constitutes a modified turbine stage. The static blade assembly has a radially inner static ring with a radially inner side confronting the periphery of the drum. A seal acts between the inner static ring and the rotor. The static blade assembly has an outer static ring which has a substantially greater thermal inertia and stiffness then the inner static ring and which is capable of sufficient sliding relative to the casing in a radial sense to accommodate relative thermal expansion and contraction of the outer static ring and the turbine casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.