Compressor of turbo machine and its compressor wheel

Abstract

The invention provides a compressor of a turbo machine and its compressor wheel that do not easily undergo breaking even when rotated at a high number of revolutions. The compressor of the turbo machine includes a male screw portion integrally formed on a main body portion of the compressor wheel and a male screw portion disposed at a distal end of a shaft for driving the compressor wheel that are coupled with each other through a sleeve equipped at one of the ends thereof with a female screw portion capable of meshing with the male screw portion of the compressor wheel and at the other end with a female screw portion capable of meshing with the male screw portion of the shaft.

1 . A compressor of a turbo machine comprising: 
 a compressor wheel male screw portion integrally disposed on a main body portion of a compressor wheel;    a shaft male screw portion disposed at a distal end of a driving shaft of the compressor wheel; and    a sleeve equipped at one of the ends thereof with a compressor wheel-side female screw portion capable of meshing with the compressor wheel male screw and at the other end thereof with a shaft-side female screw portion capable of meshing with the shaft male screw portion;    the compressor wheel screw portion and the shaft male screw portion being coupled with each other through the sleeve.    
   
   
       2 . The compressor of a turbo machine as defined in  claim 1 , wherein a diameter of the compressor wheel male screw portion is greater than a diameter of the shaft male screw portion.  
   
   
       3 . The compressor of a turbo machine as defined in  claim 1 , wherein at least one of centering between the compressor wheel and the sleeve and centering between the sleeve and the shaft is made by means of a spigot joint arrangement.  
   
   
       4 . The compressor of a turbo machine as defined in  claim 2 , wherein at least one of centering between the compressor wheel and the sleeve and centering between the sleeve and the shaft is made by means of a spigot joint arrangement.  
   
   
       5 . The compressor of a turbo machine as defined in  claim 1 , which further comprises a seal groove formed around an outer circumferential portion of the sleeve and a seal ring fitted into the seal groove so as to prevent leakage of air and oil between a back surface chamber of the compressor wheel and a bearing chamber.  
   
   
       6 . The compressor of a turbo machine as defined in  claim 2 , which further comprises a seal groove formed around an outer circumferential portion of the sleeve and a seal ring fitted into the seal groove so as to prevent leakage of air and oil between a back surface chamber of the compressor wheel and a bearing chamber.  
   
   
       7 . The compressor of a turbo machine as defined in  claim 3 , which further comprises a seal groove formed around an outer circumferential portion of the sleeve and a seal ring fitted into the seal groove so as to prevent leakage of air and oil between a back surface chamber of the compressor wheel and a bearing chamber.  
   
   
       8 . The compressor of a turbo machine as defined in  claim 4 , which further comprises a seal groove formed around an outer circumferential portion of the sleeve and a seal ring fitted into the seal groove so as to prevent leakage of air and oil between a back surface chamber of the compressor wheel and a bearing chamber.  
   
   
       9 . The compressor of a turbo machine as defined in  claim 5 , which further comprises a thrust bearing fixed to a non-rotary member not executing revolution in synchronism with the shaft and a disk-like thrust collar fixed to the shaft, and wherein the thrust collar and the sleeve sandwich the thrust bearing between them.  
   
   
       10 . The compressor of a turbo machine as defined in  claim 6 , which further comprises a thrust bearing fixed to a non-rotary member not executing revolution in synchronism with the shaft and a disk-like thrust collar fixed to the shaft, and wherein the thrust collar and the sleeve sandwich the thrust bearing between them.  
   
   
       11 . The compressor of a turbo machine as defined in  claim 7 , which further comprises a thrust bearing fixed to a non-rotary member not executing revolution in synchronism with the shaft and a disk-like thrust collar fixed to the shaft, and wherein the thrust collar and the sleeve sandwich the thrust bearing between them.  
   
   
       12 . The compressor of a turbo machine as defined in  claim 8 , which further comprises a thrust bearing fixed to a non-rotary member not executing revolution in synchronism with the shaft and a disk-like thrust collar fixed to the shaft, and wherein the thrust collar and the sleeve sandwich the thrust bearing between them.  
   
   
       13 . A compressor wheel of a compressor of a turbo machine, wherein a distal end of a cylindrical portion of a back surface-side disk portion of a compressor wheel is a male screw processed portion.