Steam/gas turbine pressure stage with universal shroud

F - Mech Eng,Light,Heat,Weapons – 01 – D

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F01D 5/18 (2006.01)

Patent

CA 2562712

There is provided a steam turbine pressure stage designed with a nozzle (directional) block with nozzle (directional) blades and shield, a rotor wheel, consisting of disc, rotor blades, a shroud and shroud seals, incorporated in the nozzle block or located on the shroud of rotor blades.

Selon l'invention, une conception imparfaite d'un anneau de renforcement (8) ou de parties identiques des aubes (7) de turbines à vapeur/gaz, y compris les joints d'étanchéité contigus, sont à l'origine d'une baisse de la fiabilité et de l'efficacité. Ces lacunes sont éliminées grâce à des trous latéraux forés dans l'anneau de renforcement et les aubes (7). Le transfert de vapeur par les trous (12) de l'anneau de renforcement donne lieu à l'allègement du gradient de pression à la surface de l'anneau de renforcement (8) et empêche la formation d'oxyde métallique, de sel et d'autres dépôts sur les surfaces intérieures de l'anneau de renforcement (8). La quantité et le diamètre des trous (12), ainsi que leur dépôt correspondant et les valeurs de jeux radiaux dans les joints d'étanchéité bombés (4, 5) de l'anneau régulent leur efficacité.

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