Automatic control device of a labyrinth seal clearance in a turbo-jet engine
US4668163A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1985 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Sep 26, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D11/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An assembly to control automatically the clearance of a labyrinth seal of the turbo machine, including a stator member is provided which includes an annular chamber supplied with a hot air flow through orifices and a colder air flow supplied through apertures formed in the radially inner part of the stator member constituting the annular carrier of a wear seal member which forms with tips carried by the one part of the rotor the labyrinth seal, these apertures being disposed upstream of the seal. The apertures lie in the zone of corresponding parts of the carrier and of the rotor part which are so shaped as to create a annular convergent-divergent annular nozzle forming a throat. The clearance of the seal is maintained constant due to relative variations effected in the air flows and, in the sense of heating up in the case of a reduction of clearance and in the sense of cooling down in the case of an increase in clearance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.