Steam turbine rotor blade

Details Steam turbine rotor blade Steam turbine rotor blade

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 5/16 (2006.01)

Patent

CA 2604757

A subject of the present invention is to prevent the reduction of rigidity caused by the increased length of a steam turbine rotor blade and the degradation of vibration characteristics. A steam turbine rotor blade according to the present invention comprises a profile and a cover integrally formed on and at an end of the profile, the leading edge of the cover formed on the profile and the trailing edge of a cover formed on an adjacent preceding profile being in contact and connected with each other by the torsional return force produced during rotation, and wherein the cover formed on the profile is provided with a radially-formed stepped portion at the trailing edge, the stepped portion having a height large than the thickness of the cover.

L'invention a pour but de prévenir la diminution de rigidité causée par l'augmentation de la longueur d'une aube de turbine à vapeur ainsi que la dégradation des caractéristiques de vibration. L'aube de turbine à vapeur comporte un profilé et un élément de recouvrement intégralement formé sur le profilé et à une extrémité du profilé, le bord d'attaque de l'élément de recouvrement étant formé sur le profilé et le bord de fuite de l'élément de recouvrement étant formé sur un profilé précédent, adjacent, en contact et relié au profilé par l'effort de torsion opposée produit par la rotation. L'élément de recouvrement formé sur le profilé comporte une portion radiale étagée sur le bord de fuite, la portion étagée étant plus haute que l'épaisseur de l'élément de recouvrement.

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