Sealing of variable guide vanes

Abstract

The guiding device of a turbine has guide vanes which are rotatably mounted in the turbine housing. A sealing sleeve is arranged between the turbine housing and the guide vane stem. The additional axial compression spring ensures that the sealing sleeve is continuously pressed onto the guide vane mating contour, and that the axial gap and also the leakage flow are prevented as a result.

1 . A guiding device, comprising at least one guide vane with a guide vane stem which is rotatably mounted in a housing, and a sealing sleeve being arranged between the housing and the guide vane stem for bridging an axial gap.  
   
   
       2 . The guiding device as claimed in  claim 1 , wherein the sealing sleeve has a radially projecting collar with an axial stop.  
   
   
       3 . The guiding device as claimed in  claim 1 , wherein the sealing sleeve is pressed against a mating contour of the guide vane by means of a compression spring.  
   
   
       4 . The guiding device as claimed in  claim 3 , wherein the sealing sleeve has a radially projecting collar with an axial stop.  
   
   
       5 . The guiding device as claimed in  claim 1 , wherein the housing comprises a guide bush for supporting the guide vane stem, and the sealing sleeve bridges a gap between the guide bush and the guide vane stem.  
   
   
       6 . A turbomachine with a guiding device, which comprises a guide vane with a guide vane stem which is rotatably mounted in a housing, and a sealing sleeve which is arranged between the housing and the guide vane stem for bridging an axial gap.  
   
   
       7 . The turbomachine as claimed in  claim 6 , wherein the sealing sleeve has a radially projecting collar with an axial stop.  
   
   
       8 . The turbomachine as claimed in  claim 6 , wherein the sealing sleeve is pressed against a mating contour of the guide vane by means of a compression spring.  
   
   
       9 . The turbomachine as claimed in  claim 8 , wherein the sealing sleeve has a radially projecting collar with an axial stop.  
   
   
       10 . The turbomachine as claimed in  claim 6 , wherein the housing comprises a guide bush for supporting the guide vane stem, and the sealing sleeve bridges a gap between the guide bush and the guide vane stem.  
   
   
       11 . An exhaust gas turbocharger with a guiding device, which comprises at least one guide vane with a guide vane stem which is rotatably mounted in a housing, and a sealing sleeve which is arranged between the housing and the guide vane stem for bridging an axial gap.  
   
   
       12 . The exhaust gas turbocharger as claimed in  claim 11 , wherein the sealing sleeve has a radially projecting collar with an axial stop.  
   
   
       13 . The exhaust gas turbocharger as claimed in  claim 11 , wherein the sealing sleeve is pressed against a mating contour of the guide vane by means of a compression spring.  
   
   
       14 . The exhaust gas turbocharger as claimed in  claim 13 , wherein the sealing sleeve has a radially projecting collar with an axial stop.  
   
   
       15 . The exhaust gas turbocharger as claimed in  claim 11 , wherein the housing comprises a guide bush for supporting the guide vane stem, and the sealing sleeve bridges a gap between the guide bush and the guide vane stem.  
   
   
       16 . The guiding device as claimed in  claim 4 , wherein the housing comprises a guide bush for supporting the guide vane stem, and the sealing sleeve bridges a gap between the guide bush and the guide vane stem.  
   
   
       17 . The turbomachine as claimed in  claim 9 , wherein the housing comprises a guide bush for supporting the guide vane stem, and the sealing sleeve bridges a gap between the guide bush and the guide vane stem.  
   
   
       18 . The exhaust gas turbocharger as claimed in  claim 14 , wherein the housing comprises a guide bush for supporting the guide vane stem, and the sealing sleeve bridges a gap between the guide bush and the guide vane stem.