Rotary machine

Abstract

To reduce the size of a rotary machine and to provide a rotary machine in which it is possible to achieve an improvement in reliability and performance of the rotary machine. A first casing ( 1 ) and a second casing ( 2 ) formed by dividing a substantially cylindrical casing ( 101 ), enclosing in the interior thereof a rotor shaft ( 4 ) in which rotor blades ( 11 ) are embedded, into two at substantially a central portion relative to an axial direction of the rotor shaft ( 4 ) are provided; a first coupling flange ( 1 A) and a second coupling flange ( 2 A) are provided at openings in the first casing ( 1 ) and the second casing ( 2 ), respectively; a third coupling flange ( 3 A) is provided, which is enclosed by the casing ( 101 ), which is positioned at substantially a central portion of the length in the axial direction in a substantially cylindrical blade ring ( 3 ) holding stator blades ( 10 ) and enclosing the rotor shaft ( 4 ), and which holds the blade ring ( 3 ); the first casing ( 1 ), the second casing ( 2 ), and the blade ring ( 3 ) being assembled by sandwiching the third coupling flange ( 3 A) between the first coupling flange ( 1 A) and the second coupling flange ( 2 A).

1 . A rotary machine, wherein
 a first casing and a second casing formed by dividing a substantially cylindrical casing, enclosing in the interior thereof a rotor shaft in which rotor blades are embedded, into two at substantially a central portion relative to an axial direction of the rotor shaft are provided;   a first coupling flange and a second coupling flange are provided at openings in the first casing and the second casing, respectively;   a third coupling flange is provided, which is enclosed by the casing, which is positioned at substantially a central portion of the length in the axial direction in a substantially cylindrical blade ring holding stator blades and enclosing the rotor shaft, and which holds the blade ring;   the first casing, the second casing, and the blade ring being assembled by sandwiching the third coupling flange between the first coupling flange and the second coupling flange.   
     
     
         2 . A rotary machine according to  claim 1 , wherein
 the blade ring is held relative to the third coupling flange by a substantially conical joining member, and   an inner peripheral surface at the blade ring side of the joining member projects from a high-pressure side to a low-pressure side in a working fluid flowing between the rotor blades and the stator blades.   
     
     
         3 . A rotary machine according to  claim 1 , wherein an outer peripheral portion of the third coupling flange is contained between the first coupling flange and the second coupling flange. 
     
     
         4 . A rotary machine according to  claim 1 , wherein
 a pressure vessel accommodating the casing therein is provided outside the casing, and   a fluid with a pressure higher than the working fluid flowing between the rotor blades and the stator blades is filled in a space between the casing and the pressure vessel.