High-speed impeller

Abstract

The invention relates to a high-speed impeller for delivering gaseous or liquid media, for example as a compressor wheel for an exhaust-gas turbocharger. The high-speed impeller has a reinforcing core structure and an outer functional section. The invention is distinguished by the fact that reinforcing sleeves are pushed concentrically over one another for producing the core structure, in which case the length of the respective reinforcing sleeves varies. Furthermore, the functional section is cast onto the core structure.

1 . A high-speed impeller for delivering gaseous or liquid media, having a reinforcing core structure and an outer functional section, wherein 
 a plurality of reinforcing sleeves are pushed concentrically over one another for producing the core structure, in which case    a length of each of the respective reinforcing sleeves varies, and    the functional section is cast onto the core structure.    
     
     
         2 . The high-speed impeller as claimed in  claim 1 , wherein the length of each of the respective reinforcing sleeves is reduced with increasing outside diameter.  
     
     
         3 . A high-speed impeller for delivering gaseous or liquid media, having a reinforcing core structure and an outer functional section, wherein 
 a plurality of reinforcing sleeves with in each case inner bores having the same diameter are concentrically aligned on a common axis,    the outside diameters of the reinforcing sleeves vary for reproducing a predetermined cross-sectional geometry of the core structure, and    the functional section is cast onto the core structure.    
     
     
         4 . The high-speed impeller as claimed in  claim 3 , wherein the reinforcing sleeves with the aligned inner bores are concentrically pushed onto a center reinforcing sleeve whose outer diameter corresponds to the diameter of the inner bores of the same kind.  
     
     
         5 . The high-speed impeller as claimed in  claim 1 , wherein the reinforcing sleeves comprise a fiber-reinforced material.  
     
     
         6 . The high-speed impeller as claimed in  claim 3 , wherein the reinforcing sleeves comprise a fiber-reinforced material.  
     
     
         7 . The high-speed impeller as claimed in  claim 5 , wherein the reinforcing sleeves have a long-fiber-reinforced wound body.  
     
     
         8 . The high-speed impeller as claimed in  claim 6 , wherein the reinforcing sleeves have a long-fiber-reinforced wound body.  
     
     
         9 . The high-speed impeller as claimed in  claim 1 , wherein the reinforcing sleeves consist of a metal-matrix composite material reinforced with short fibers.  
     
     
         10 . The high-speed impeller as claimed in  claim 3 , wherein the reinforcing sleeves consist of a metal-matrix composite material reinforced with short fibers.  
     
     
         11 . The high-speed impeller as claimed in  claim 1 , wherein the reinforcing sleeves consist of a metal-infiltrated porous ceramic.  
     
     
         12 . The high-speed impeller as claimed in  claim 3 , wherein the reinforcing sleeves consist of a metal-infiltrated porous ceramic.  
     
     
         13 . The high-speed impeller as claimed in  claim 1 , wherein the reinforcing sleeves consist of a spray-compacted metal material.  
     
     
         14 . The high-speed impeller as claimed in  claim 3 , wherein the reinforcing sleeves consist of a spray-compacted metal material.  
     
     
         15 . The high-speed impeller as claimed in  claim 1 , wherein the reinforcing sleeves consist of a high strength wrought alloy.  
     
     
         16 . The high-speed impeller as claimed in  claim 3 , wherein the reinforcing sleeves consist of a high strength wrought alloy.  
     
     
         17 . The high-speed impeller as claimed in  claim 1 , wherein the high-speed impeller is a compressor wheel or a turbine wheel of an exhaust-gas turbocharger.  
     
     
         18 . The high-speed impeller as claimed in  claim 3 , wherein the high-speed impeller is a compressor wheel or a turbine wheel of an exhaust-gas turbocharger.  
     
     
         19 . A method of forming a high speed impeller for delivering gaseous or liquid media, comprising the steps of: 
 arranging a plurality of concentric reinforcing sleeves over one another to produce a core structure, wherein a length of each of the respective reinforcing sleeves varies; and    casting a functional section onto the core structure.    
     
     
         20 . A method of forming a high speed impeller for delivering gaseous or liquid media, comprising the steps of 
 concentrically aligning on a common axis the inner bores of a plurality of reinforcing sleeves, wherein the inner bores of each of the reinforcing sleeves have the same diameter, and the outside diameters of the reinforcing sleeves vary, such that a core structure of a predetermined cross-sectional geometry is produced; and    casting a functional section onto the core structure.