Gas turbine with a shroud and labyrinth-type sealing arrangement

Abstract

A gas turbine with a shroud and labyrinth-type sealing arrangement has a casing 1 and at least one rotor 9, whose blades 2 are provided with a shroud 3. The labyrinth seal 4 is provided between the shroud 3 and the casing 1 and the shroud 3 includes at least two radially spaced and axially protruding annular fins 5, which are part of the labyrinth seal 4 At least one sealing fin 6 is provided on the casing 1 which extends essentially radially to the shroud 3 at least over a part of the circumference and at least partly in a space between the annular fins 5.

1 . A gas turbine, comprising:
 a casing;   at least one rotor having blades provided with a shroud;   a labyrinth seal provided between the shroud and the casing, the shroud including at least two axially spaced and radially outwardly protruding annular fins forming a part of the labyrinth seal;   at least one sealing fin provided on the casing which extends essentially radially inwardly from a surface of the casing toward the shroud at least over a part of the circumference and at least partly in a space between the annular fins.   
     
     
         2 . The gas turbine of  claim 1 , wherein the sealing fin is provided as a ring. 
     
     
         3 . The gas turbine of  claim 1 , wherein the sealing fin is circumferentially segmented. 
     
     
         4 . The gas turbine of  claim 1 , wherein the sealing fin has a circumferentially constant cross-section. 
     
     
         5 . The gas turbine of  claim 1 , wherein the sealing fin has a circumferentially varying cross-section. 
     
     
         6 . The gas turbine of  claim 1 , wherein the sealing fin has an essentially rectangular cross-section. 
     
     
         7 . The gas turbine of  claim 1 , wherein the sealing fin has a rounded cross-section. 
     
     
         8 . The gas turbine of  claim 1 , wherein the sealing fin has an essentially radially oriented cross-section. 
     
     
         9 . The gas turbine of  claim 1 , wherein the sealing fin has a cross-section which is inclined to a radial direction. 
     
     
         10 . The gas turbine of  claim 1 , wherein the sealing fin is integral with the casing. 
     
     
         11 . The gas turbine of  claim 1 , wherein the sealing fin is a separate item connected to the casing. 
     
     
         12 . The gas turbine of  claim 1 , wherein the casing includes a conically widening axial cross-section. 
     
     
         13 . The gas turbine of  claim 1 , wherein the casing includes a stepped axial cross-section with sealing fins positioned on the casing steps.