Rotating machinery

Abstract

There is provided a rotating machinery including: a rotating body R which is rotatable around an axis O and has a first facing surface P 1 that widens in a plane intersecting the axis O; a stationary body S which faces the first facing surface P 1 from the axial direction O, and has a second facing surface P 2 forming a flow path F 1 through which a fluid flows from a radially inner side toward the radially outer side between the first facing surface P 1 and the second facing surface P 2 ; and a rotation side projection portion 80 which projects from the first facing surface P 1 toward the second facing surface P 2 , has an annular shape around the axis O, and faces the second facing surface P 2 via a clearance C.

What is claimed is: 
     
         1 . A rotating machinery comprising:
 a rotating body which is rotatable around an axis and has a first facing surface that widens in a plane intersecting the axis;   a stationary body has a second facing surface which faces the first facing surface in an axial direction and forms a flow path through which a fluid flows from a radially inner side toward a radially outer side between the first facing surface and the second facing surface; and   at least one rotation side projection portion which projects from the first facing surface toward the second facing surface, has an annular shape around the axis, and faces the second facing surface via a clearance.   
     
     
         2 . The rotating machinery according to  claim 1 ,
 wherein positions of a first inner region which is a region on the radially inner side with respect to the at least one rotation side projection portion and a first outer region which is a region on the radially outer side with respect to the at least one rotation side projection portion on the first facing surface, are the same in the axial direction.   
     
     
         3 . The rotating machinery according to  claim 1 ,
 wherein a first outer region which is a region on the radially outer side with respect to the at least one rotation side projection portion on the first facing surface widens to a position further away from the second facing surface in the axial direction than a first inner region which is a region on the radially inner side with respect to the at least one rotation side projection portion on the first facing surface.   
     
     
         4 . The rotating machinery according to  claim 3 ,
 wherein the first outer region extends in a direction gradually spaced apart from the second facing surface as going from the radially inner side toward the radially outer side in a sectional view including the axis.   
     
     
         5 . The rotating machinery according to  claim 1 ,
 wherein a second outer region which is a region on the radially outer side with respect to the at least one rotation side projection portion on the second facing surface extends in a direction gradually spaced apart from the first facing surface as going from the radially inner side toward the radially outer side in a sectional view including the axis.   
     
     
         6 . The rotating machinery according to  claim 1 , further comprising:
 at least one stationary side projection portion which is provided at a position facing the at least one rotation side projection portion on the second facing surface and projects toward the at least one rotation side projection portion.   
     
     
         7 . The rotating machinery according to  claim 6 ,
 wherein an end surface facing the first facing surface in the at least one stationary side projection portion is formed in a planar shape that widens in a plane intersecting the axis.   
     
     
         8 . The rotating machinery according to  claim 6 ,
 wherein the at least one stationary side projection portion includes a plurality of stationary side projection portions; and   the plurality of stationary side projection portions are arranged at intervals in a circumferential direction and extend to a front side in a rotational direction of the rotating body as going from the radially inner side toward the radially outer side.   
     
     
         9 . The rotating machinery according to  claim 6 ,
 wherein a second outer region which is a region on the radially outer side with respect to the at least one rotation side projection portion extends in a direction gradually spaced apart from the first facing surface starting from an end edge of the at least one stationary side projection portion on a first facing surface side as going from the radially inner side toward the radially outer side in a sectional view including the axis.   
     
     
         10 . The rotating machinery according to  claim 1 ,
 wherein the at least one rotation side projection portion includes a plurality of rotation side projection portions; and   the plurality of rotation side projection portions are provided at intervals in a radial direction on the first facing surface.   
     
     
         11 . The rotating machinery according to  claim 1 ,
 wherein the at least one rotation side projection portion has a radial dimension that decreases going from the first facing surface side toward the second facing surface side.   
     
     
         12 . A rotating machinery comprising:
 a rotating body which is rotatable around an axis and has a first facing surface that widens in a plane intersecting the axis;   a stationary body which has a second facing surface which faces the first facing surface in an axial direction and forms a flow path through which a fluid flows from a radially outer side toward a radially inner side between the first facing surface and the second facing surface; and   at least one rotation side projection portion which is provided in an end portion on the radially outer side on the first facing surface, projects toward the second facing surface, has an annular shape around the axis, and faces the second facing surface via a clearance.   
     
     
         13 . The rotating machinery according to  claim 12 , further comprising:
 a recess portion provided adjacent to the radially inner side with respect to the at least one rotation side projection portion on the first facing surface and recessed in a direction spaced apart from the second facing surface.   
     
     
         14 . The rotating machinery according to  claim 13 ,
 wherein a bottom surface of the recess portion extends in a direction gradually spaced apart from the second facing surface as going from a radially inner side toward the radially outer side in a sectional view including the axis.   
     
     
         15 . The rotating machinery according to  claim 13 , further comprising:
 a stationary side recess portion provided in a region facing the recess portion on the second facing surface, and recessed in a direction spaced apart from the first facing surface,   wherein a bottom surface of the stationary side recess portion extends in a direction gradually spaced apart from the first facing surface as going from the radially outer side to the radially inner side in a sectional view including the axis.   
     
     
         16 . The rotating machinery according to  claim 12 , further comprising:
 at least one stationary side projection portion which is provided at a position facing the at least one rotation side projection portion on the second facing surface and projects toward the at least one rotation side projection portion.   
     
     
         17 . The rotating machinery according to  claim 16 ,
 wherein an end surface facing the first facing surface in the at least one stationary side projection portion is formed in a planar shape that widens in a radial direction.   
     
     
         18 . The rotating machinery according to  claim 16 ,
 wherein the at least one stationary side projection portion includes a plurality of stationary side projection portions; and   the plurality of stationary side projection portions are arranged at intervals in a circumferential direction and extend to a front side in a rotational direction of the rotating body as going from the radially outer side toward the radially inner side.   
     
     
         19 . The rotating machinery according to  claim 13 ,
 wherein a region facing the recess portion on the second facing surface extends in a direction gradually spaced apart from the first facing surface as going from the radially outer side to the radially inner side in a sectional view including the axis.   
     
     
         20 . The rotating machinery according to  claim 12 ,
 wherein the at least one rotation side projection portion includes a plurality of rotation side projection portions; and   the plurality of rotation side projection portions are provided at intervals in a radial direction on the first facing surface.   
     
     
         21 . The rotating machinery according to  claim 12 ,
 wherein the at least one rotation side projection portion has a radial dimension that decreases going from the first facing surface side toward the second facing surface side.