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AssigneeALSTOM Technology Ltd
InventorsHelmar WUNDERLE, Stefan SCHLECHTRIEM, Peter GRAF, Silvio GLASER, Beat VON ARX
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A method is described for improving the sealing between rotor and a plurality of blades. The rotor has a plurality of generally axially extending profiled recesses into which a ring of blades, which have corresponding blade root profiles, are inserted in a form-fitting and/or frictionally locking manner into these recesses in a generally axial insertion direction. Between the recesses the rotor has tangential surface sections or circumferential surface sections which extend in the axial direction and circumferential direction and are generally indirectly covered by lower shrouds of circumferentially adjacently arranged blades in the radial direction. At least one of the tangential surface or circumferential surface sections is provided with a step in the radial direction, and a corresponding recess, which adjoins as flush as possible, is provided in the underside of the shroud of the blade which is arranged above it. Corresponding rotors or blades are also described.
A method for improving sealing between a 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 generally axially extending recesses (4) into which a ring of blades (2), which have corresponding blade root profiles (16) which correspond to the recesses (4), are inserted in a form-fitting and/or frictionally locking manner in a generally 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 generally at least indirectly covered by lower shrouds (7) of circumferentially adjacently arranged blades (2) in the radial direction, the method comprising:
A blade comprising a blade root (3) and a blade airfoil (9) which is formed thereupon, wherein the blade root (3) has a blade root profile (16) and a lower shroud (7), and on an underside of the shroud (7) there is a recess (12) which is open in an insertion direction (8) towards a rotor (1), the recess (12) preferably extends over an entire tangential or circumferential width of the underside of the shroud (7) on two sides of the blade airfoil (9).
A rotor (1) for anchoring an encompassing ring of blades (2), the rotor comprising a plurality of generally axially extending profiled recesses (4) into which the ring of blades (2), which have corresponding blade root profiles (16), can be inserted in a form-fitting and/or frictionally locking manner into these recesses in a generally axial insertion direction (8), 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 generally at least indirectly covered by lower shrouds (7) of circumferentially adjacently arranged blades (2) in the radial direction, at least one of the tangential surface sections or circumferential surface sections (5, 5′) is provided with a stop element (13) in the radial direction (R).
Dependencies are inferred from the claim text.