Joining structure of rotation part of rotary machine and method of joining rotation part of rotary machine

Abstract

A joining structure of a rotation part of a rotary machine, where the rotation part including blades and a shroud, includes a welded part made up of a solidified melted part of the blades and the shroud, and a brazed part disposed at a junction part of the blades and the shroud.

What is claimed is: 
     
         1 . A joining structure of a rotation part of a rotary machine, the rotation part comprising blades and a shroud, and the joining structure comprising:
 a welded part comprising a solidified melted part of each blade and the shroud; and   a brazed part disposed at a junction part.   
     
     
         2 . The joining structure of  claim 1 , wherein the rotary machine is a compressor or a pump. 
     
     
         3 . The joining structure of  claim 1 , wherein the brazed part comprises:
 a fillet part formed at the junction part; and   a clearance bonding part formed at a minute clearance of the junction part between the blade and the shroud.   
     
     
         4 . A method of joining a rotation part of a rotary machine, the method comprising:
 preparing a blade and a shroud;   disposing the blade on one surface of the shroud;   disposing a filler metal at a junction part of the blade and the shroud;   performing a brazing process; and   performing a welding process on the blade and the shroud after performing the brazing process.   
     
     
         5 . The method of  claim 4 , wherein the rotary machine is a compressor or a pump. 
     
     
         6 . The method of  claim 4 , wherein the filler metal is in the form of a paste. 
     
     
         7 . The method of  claim 4 , wherein the performing of the brazing process comprises:
 irradiating an electron beam or a laser beam onto a portion of another surface of the shroud, which is opposite to a portion of the one surface of the shroud where the blade is disposed; and   melting the filler metal by using heat generated by the electron beam or the laser beam.   
     
     
         8 . The method of  claim 7 , wherein the performing of the brazing process further comprises:
 forming a fillet part at the junction part; and   forming a clearance bonding part at a minute clearance of the junction part between the blade and the shroud by using the melted filler metal.   
     
     
         9 . The method of  claim 4 , wherein the performing of the welding process comprises:
 irradiating the electron beam or the laser beam onto the portion of the another surface of the shroud, which is opposite to the portion of the one surface of the shroud where the blade is disposed; and   melting the blade and the shroud to form a melted part.   
     
     
         10 . The method of  claim 9 , wherein the performing of the welding process further comprises solidifying the melted part. 
     
     
         11 . The method of  claim 4  further comprises attaching the blade to a base unit of an impeller. 
     
     
         12 . A method of joining a rotation part of a rotary machine, the method comprising:
 preparing a blade and a shroud;   disposing the blade on one surface of the shroud;   performing a welding process on the blade and the shroud;   disposing a filler metal at a junction part of the blade and the shroud; and   performing a brazing process by applying heat to the junction part and melting the disposed filler metal after performing the welding process.   
     
     
         13 . The method of  claim 12 , wherein the performing of the welding process comprises:
 irradiating the electron beam or the laser beam onto the portion of the another surface of the shroud, which is opposite to the portion of the one surface of the shroud where the blade is disposed; and   melting the blade and the shroud to form a melted part.   
     
     
         14 . The method of  claim 13 , wherein the performing of the welding process further comprises solidifying the melted part. 
     
     
         15 . The method of  claim 12 , wherein the performing of the brazing process comprises disposing the rotational part in a furnace. 
     
     
         16 . The method of  claim 12 , wherein the performing of the brazing process comprises performing one of torch brazing, induction brazing, dip brazing, salt-bath brazing, or resistance brazing. 
     
     
         17 . The method of  claim 12 , wherein the rotary machine is a compressor or a pump. 
     
     
         18 . The method of  claim 12 , wherein the filler metal is in the form of paste. 
     
     
         19 . The method of  claim 12 , wherein the performing of the brazing process comprises:
 forming a fillet part at the junction part; and   forming a clearance bonding part at a clearance between the blade and the shroud by using the melted filler metal.   
     
     
         20 . The method of  claim 12  further comprises attaching the blade to a base unit of an impeller.