Turbine

Abstract

The present invention relates to a turbine having a housing ( 11 ) and a rotor ( 12 ), the housing ( 11 ) being provided with a plurality of rows of guide vanes ( 13 ) and the rotor ( 12 ) being provided with a plurality of rows of rotor blades ( 14 ). On the housing ( 11 ), there is a guide ring ( 18 ) which is provided axially between in each case two rows of guide vanes ( 13 ), which guide ring, together with the associated row of rotor blades ( 14 ), delimits a gap ( 21 ). According to the invention, the guide ring ( 18 ) is adjustable in order to change the gap ( 21 ). The size of the gap ( 21 ) can then be predetermined by adjusting the guide ring ( 18 ) and can be optimized according to the specific application.

What is claimed is:  
     
         1 . A turbine comprising a housing and a rotor, the housing being provided with a plurality of rows of guide vanes and the rotor being provided with a plurality of rows of rotor blades, and a guide ring being provided on the housing in the axial direction between in each case two rows of guide vanes, the guide ring together with the associated row of rotor blades delimiting a gap characterized in that the guide ring can be adjusted in order to change the gap.  
     
     
         2 . The turbine as claimed in  claim 1 , wherein the guide ring can be adjusted in the axial direction of the turbine.  
     
     
         3 . The turbine as claimed in  claim 2 , wherein the guide ring has at least one guide face, which runs parallel to an axis of rotation of the rotor and is in contact with at least one stationary supporting surface.  
     
     
         4 . The turbine as claimed in  claim 3 , wherein the at least one supporting surface is formed on platforms of the guide vanes which adjoin the guide ring.  
     
     
         5 . The turbine as claimed in  claim 1 , wherein the guide ring is arranged on a guide-ring carrier, which can be adjusted with respect to the housing.  
     
     
         6 . The turbine as claimed in  claim 5 , wherein the guide-ring carrier has at least one groove, into which an eccentric which can be driven rotatably engages for adjustment purposes.  
     
     
         7 . The turbine as claimed in  claim 5 , wherein a cooling chamber for cooling the guide ring is provided between the guide ring and the guide-ring carrier.  
     
     
         8 . The turbine as claimed in  claim 1 , characterized in that the guide ring is sealed with respect to the housing by at least one seal in order to minimize losses of cooling medium.  
     
     
         9 . The turbine as claimed in  claim 8 , wherein the seal is designed as a labyrinth seal or as an elastically deformable seal.  
     
     
         10 . The turbine as claimed in  claim 8 , wherein the guide ring is accommodated in an insert and is sealed with respect to this insert.  
     
     
         11 . A turbine adapted for use in a land-based power generation plant, comprising: 
 a housing having a plurality of rows of guide vanes;    a rotor having a plurality of rows of rotor blades; and    a guide ring provided on the housing in the axial direction between two rows of guide vanes, the guide ring and the associated row of rotor blades forming a gap    wherein the guide ring can be adjusted in order to change the size of the gap.    
     
     
         12 . The turbine as claimed in  claim 11 , wherein the guide ring can be adjusted in the axial direction of the turbine.  
     
     
         13 . The turbine as claimed in  claim 12 , wherein the guide ring has at least one guide face, which runs parallel to an axis of rotation of the rotor and is in contact with at least one stationary supporting surface.  
     
     
         14 . The turbine as claimed in  claim 13 , wherein the at least one supporting surface is formed on platforms of the guide vanes which adjoin the guide ring.  
     
     
         15 . The turbine as claimed in  claim 11 , wherein the guide ring is arranged on a guide-ring carrier, which can be adjusted with respect to the housing.  
     
     
         16 . The turbine as claimed in  claim 15 , wherein the guide-ring carrier has at least one groove, into which an eccentric which can be driven rotatably engages for adjustment purposes.  
     
     
         17 . The turbine as claimed in  claim 15 , wherein a cooling chamber for cooling the guide ring is provided between the guide ring and the guide-ring carrier.  
     
     
         18 . The turbine as claimed in  claim 11 , characterized in that the guide ring is sealed with respect to the housing by at least one seal in order to minimize losses of cooling medium.  
     
     
         19 . The turbine as claimed in  claim 18 , wherein the seal is designed as a labyrinth seal or as an elastically deformable seal.  
     
     
         20 . A turbine adapted for use in a land-based power generation plant, comprising: 
 a housing having a plurality of rows of guide vanes;    a rotor in operative association with the guide vanes;    a guide ring provided on the housing between two rows of guide vanes, the guide ring and the associated row of rotor blades forming an adjustable gap.