Apparatus for controlling steam blocking at stuffing boxes for steam turbine shafting
US3959973A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1975 |
| Grant date | Jun 1, 1976 |
| Priority date | — |
| Expiry date | Apr 16, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D11/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a steam turbine structure, a stuffing box is conventionally provided for the rotor shaft at the shaft passthrough opening in the turbine casing and blocking steam is admitted to the stuffing box. In order to prevent thermal-shock damage to the shaft at the stuffing box during a re-start of the turbine while the shaft temperature is still approximately at its normal operating temperature and while the blocking steam is then temporarily in a wet state, the blocking steam is prevented from reaching the stuffing box, the wet steam being diverted by way of a controllable valve through a by-pass leading to a condenser. After the blocking steam has reached its dry state, the valve closes off the by-pass to the condenser and opens the blocking steam line leading to the stuffing box.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.