Patent ID: 9435213
Filing Date: 2016-09-06
CPC Classification: F01D,F05D,Y10T

Claim Text:
1. A method for improving sealing between a rotor and a plurality of blades which are anchored in the rotor and arranged in the form of an encompassing ring, wherein the rotor has a plurality of generally axially extending first recesses into which a ring of blades, which have corresponding blade root profiles which correspond to the first recesses, are inserted in a form-fitting and/or frictionally locking manner in a generally axial insertion direction, and wherein between the first recesses the rotor has circumferential surface sections which extend in the axial direction and circumferential direction and are generally at least indirectly covered by lower shrouds of circumferentially adjacently arranged blades in a radial direction, the method comprising: providing the circumferential surface sections with stop elements in the radial direction, wherein the stop elements have a rectangular or square cross section in axial section, providing a second recess in an underside of the shroud of each of the plurality of blades, wherein second recesses of first and second adjacent blades of the plurality of blades abut the stop elements along an entire circumferential length of the stop element, and the stop elements are fully accommodated in the second recesses, wherein the stop elements and the corresponding second recesses are configured in a stepped shape forming a labyrinth seal, wherein the labyrinth seal is configured to allow an amount of cooling air to flow to the stepped shape, and providing cooling air passages in the rotor and leading outwards from the surface sections in the radial direction for feeding the cooling air which is blown out along the stepped shape between the stop elements and the second recesses, wherein the stop elements comprise ring sections connected to the circumferential surface sections by welding or soldering.