Thickened radially outer annular portion of a sealing fin

Abstract

A blisk 10 for a gas turbine includes a rotor blade row 12 extending around a central axis X and, axially spaced therefrom and extending coaxially therewith, at least one annular sealing fin 11 . The sealing fin has a radially outer annular portion 111 that is thickened as compared to a radially more inward annular portion 113 . A compressor 1 includes a rotor and a casing 30 . The casing includes at least one stator vane row having at least one abradable liner. The rotor includes at least one blisk 10 , whose at least one sealing fin 11 at least partly engages in the abradable liner. A turbine is constructed analogously. A method for manufacturing a blisk 10 for a gas turbine includes producing a blisk 10 having least one annular sealing fin 11 , as well as applying a coating 116 to a radially outer surface 115 of a thickened annular portion 111 of sealing fin 11.

What is claimed is: 
     
         1 . A blisk for a gas turbine, the blisk comprising:
 a rotor blade row extending around a central axis; and   at least one annular sealing fin axially spaced from the rotor blade row and extending coaxially with the rotor blade row, the annular sealing fin having a radially outer annular portion thickened as compared to a radially more inward annular portion of the sealing fin.   
     
     
         2 . The blisk as recited in  claim 1  wherein the thickened annular portion is provided with a coating on a radially outer surface. 
     
     
         3 . The blisk as recited in  claim 1  wherein the thickened annular portion includes a radially outermost section, the thickened annular portion tapering radially outwardly in the radially outermost section. 
     
     
         4 . The blisk as recited in  claim 1  wherein the radially more inward annular portion thickens radially inwardly. 
     
     
         5 . The blisk as recited in  claim 1  wherein an extent (a 2 ) of the radially more inward annular portion in the radial direction is at least twice an extent (a 1 ) of the thickened annular portion in the radial direction. 
     
     
         6 . The blisk as recited in  claim 1  wherein the radially more inward annular portion or the thickened annular portion is configured symmetrically to a plane extending perpendicular to the central axis. 
     
     
         7 . The blisk as recited  claim 1  wherein the radially more inward annular portion and the thickened annular portion are sections of a rub-in portion of the sealing fin, the rub-in portion being disposed on a sealing fin base, the sealing fin base having an axial thickness greater than an axial thickness of the thickened annular portion. 
     
     
         8 . A compressor for a gas turbine, the compressor comprising:
 a rotor; and   a casing, the casing including at least one stator vane row having radially inwardly extending stator vanes with stator vane tips provided with an abradable liner,   the rotor includes at least one blisk as recited in  claim 1 , the annular sealing fin at least partly engaging in the abradable liner.   
     
     
         9 . A turbine for a gas turbine, the turbine comprising:
 a rotor; and   a casing, the casing including at least one stator vane row having stator vanes with stator vane tips each provided with an abradable liner,   the rotor including at least one blisk as recited in  claim 1 , the annular sealing fin at least partly engaging in the abradable liner.   
     
     
         10 . A method for manufacturing a blisk for a gas turbine, the method comprising:
 producing a blisk having a rotor blade row extending around a central axis and at least one annular sealing fin axially spaced from the rotor blade row and extending coaxially with the rotor blade row, the annular sealing fin having a radially outer annular portion thickened as compared to a radially more inward annular portion; and   applying a coating to a radially outer surface of the thickened annular portion.   
     
     
         11 . The method as recited in  claim 10  wherein the surface provided with the coating includes a surface of a radially outermost section where the thickened annular portion tapers radially outwardly from a maximum thickness.