Centrifugal compressor

Abstract

A centrifugal compressor includes a passage forming member being arranged in a rear side of an impeller fixed to a tip side of a rotor shaft, and forming a passage, together with a scroll member, and a casing member disposed adjacent to an opposite side of the passage forming member from the impeller along an axial direction. The passage forming member has a first protrusion, and the casing member has a second protrusion. The first protrusion and the second protrusion are fixed to each other by a bolt member inserted from an outside in a radial direction toward an inside in the radial direction.

1 . A centrifugal compressor comprising:
 a rotor shaft rotatably supported by a bearing;   an impeller fixed to the rotor shaft in a tip side with respect to the bearing;   a passage forming member arranged in a rear side of the impeller, the passage forming member forming, together with a scroll member forming a scroll passage outside the impeller in a radial direction, a passage communicating with the scroll passage; and   a casing member disposed adjacent to an opposite side of the passage forming member to the impeller along an axial direction, wherein   the passage forming member has a first protrusion formed to protrude toward the casing member,   the casing member has a second protrusion formed to protrude toward the passage forming member, and   the first protrusion and the second protrusion are fixed to each other by a bolt member inserted from an outside in the radial direction to an inside in the radial direction.   
     
     
         2 . The centrifugal compressor according to  claim 1 , wherein
 a plurality of the bolt members are disposed along a circumferential direction of the rotor shaft.   
     
     
         3 . The centrifugal compressor according to  claim 1 , wherein
 the first protrusion and the second protrusion are fixed to each other by a pin member inserted along the radial direction.   
     
     
         4 . The centrifugal compressor according to  claim 1 , wherein
 a reinforcing rib is formed along the radial direction, over both a radially outer surface of the second protrusion and a surface of the casing member.   
     
     
         5 . The centrifugal compressor according to  claim 1 , wherein
 the first protrusion and the second protrusion are engaged with each other via a spline.   
     
     
         6 . The centrifugal compressor according to  claim 1 , wherein
 the first protrusion and the second protrusion are engaged with each other via an inlay structure.   
     
     
         7 . The centrifugal compressor according to  claim 1 , wherein
 the passage forming member has a sealing member configured to seal an internal space accommodating the impeller from an outside, and to rotatably support the rotor shaft.   
     
     
         8 . The centrifugal compressor according to  claim 7 , wherein
 the casing member has a bearing configured to rotatably support the rotor shaft inside the sealing member in the axial direction.   
     
     
         9 . The centrifugal compressor according to  claim 1 , wherein
 the casing member accommodates a speed-increasing gear mechanism provided with the rotor shaft.   
     
     
         10 . A centrifugal compressor comprising:
 a rotor shaft rotatably supported by a bearing;   an impeller fixed to the rotor shaft in a tip side with respect to the bearing;   a passage forming member arranged in a rear side of the impeller, the passage forming member forming, together with a scroll member forming a scroll passage outside the impeller in a radial direction, a passage communicating with the scroll passage; and   a casing member disposed adjacent to an opposite side of the passage forming member to the impeller along an axial direction, wherein   the passage forming member has a first protrusion formed to protrude toward the casing member,   the casing member has a second protrusion formed to protrude toward the passage forming member,   the first protrusion and the second protrusion are fixed to each other by a bolt member inserted from an outside in the radial direction to an inside in the radial direction, and   the first protrusion is arranged inside the second protrusion in the radial direction.   
     
     
         11 . The centrifugal compressor according to  claim 10 , wherein
 a plurality of the bolt members are disposed along a circumferential direction of the rotor shaft.   
     
     
         12 . The centrifugal compressor according to  claim 10 , wherein
 the first protrusion and the second protrusion are fixed to each other by a pin member inserted along the radial direction.   
     
     
         13 . The centrifugal compressor according to  claim 10 , wherein
 a reinforcing rib is formed along the radial direction, over both a radially outer surface of the second protrusion and a surface of the casing member.   
     
     
         14 . The centrifugal compressor according to  claim 10 , wherein
 the first protrusion and the second protrusion are engaged with each other via a spline.   
     
     
         15 . The centrifugal compressor according to  claim 10 , wherein
 the first protrusion and the second protrusion are engaged with each other via an inlay structure.   
     
     
         16 . The centrifugal compressor according to  claim 10 , wherein
 the passage forming member has a sealing member configured to seal an internal space accommodating the impeller from an outside, and to rotatably support the rotor shaft.   
     
     
         17 . The centrifugal compressor according to  claim 16 , wherein
 the casing member has a bearing configured to rotatably support the rotor shaft inside the sealing member in the axial direction.   
     
     
         18 . The centrifugal compressor according to  claim 10 , wherein
 the casing member accommodates a speed-increasing gear mechanism provided with the rotor shaft.