Method for improving the sealing on rotor arrangements

Details Method for improving the sealing on rotor arrangements Method for improving the sealing on rotor arrangements

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 5/30 (2006.01)

Patent

CA 2707510

A method is described for improving the sealing between rotor (1) and a plurality of blades (2) which are anchored in the rotor (1) and arranged in the form of an encompassing ring, wherein the rotor has a plurality of essentially axially extending profiled recesses (4) into which a ring of blades (2), which have corresponding blade root profiles (16), are inserted in a form-fitting and/or frictionally locking manner into these recesses (4) in an essentially axial insertion direction (8), and wherein between the recesses (4) the rotor (1) has tangential surface sections or circumferential surface sections (5, 5') which extend in the axial direction (A) and circumferential direction and are essentially at least indirectly covered by lower shrouds (7) of circumferentially adjacently arranged blades (2) in the radial direction. In this case, it is thus proposed that at least one of the tangential surface sections or circumferential surface sections (5, 5') is provided with a step (13) in the radial direction (R), and a corresponding recess (12), which adjoins in a manner which is as flush as possible, is provided in the underside of the shroud (7) of the blade (2) which is arranged above it. Furthermore, corresponding rotors or blades are described.

L'invention concerne un agencement de rotor de turbine pour améliorer l'étanchéité entre le rotor (1) et une pluralité d'aubes (2) ancrées dans le rotor (1) et disposées sous forme de couronne périphérique. Le rotor dispose d'une pluralité d'évidements (4) profilés s'étendant essentiellement axialement, dans lesquels est enfoncée une couronne d'aubes (2), qui disposent de profilés de base d'aube correspondants (16) dans une direction d'enfoncement (8) essentiellement axiale, par engagement par correspondance géométrique et/ou par force. Le rotor (1) dispose entre les évidements (4) de parties de surface tangentielles ou de parties de surface périphériques (5, 5') s'étendant dans la direction axiale (A) et dans la direction périphérique, qui sont recouvertes dans la direction radiale essentiellement au moins de manière indirecte, par des bandes de recouvrement inférieures (7) d'aubes (2) disposées les unes à côté des autres sur la périphérie. En l'occurrence, on procède de telle sorte qu'au moins l'une des parties de surface tangentielles, respectivement des parties de surface périphériques (5, 5'), soit munie d'un gradin (13) dans la direction radiale (R) et qu'un évidement (12) correspondant, se raccordant dans la mesure du possible exactement en alignement, soit pratiqué dans le côté inférieur de la bande de recouvrement (7) de l'aube (2) disposée au-dessus. L'invention concerne aussi des rotors et des aubes correspondants.

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