Radial gas expander

Abstract

This radial gas expander is provided with a rotating shaft, an impeller which is fixed to the rotating shaft, and a casing by which the rotating shaft is supported in a rotatable manner and in which an introduction channel introducing fluid to the impeller is formed. The introduction channel includes a nozzle blade which guides fluid flowing into the impeller and a support member which is provided in the upstream side of the nozzle blade and which supports wall surfaces of the introduction channel, wherein the wall surfaces are mutually opposed, and the support member has a wing shape in a cross-sectional view.

1 . A radial gas expander comprising:
 a rotating shaft;   an impeller which is fixed to the rotating shaft; and   a casing by which the rotating shaft is supported in a rotatable manner and in which an introduction channel introducing fluid to the impeller is formed,   wherein the introduction channel includes:
 a nozzle blade which guides fluid flowing into the impeller; and 
 a support member which is provided in an upstream side of the nozzle blade and which supports wall surfaces of the introduction channel, wherein the wall surfaces are mutually opposed, and 
   wherein the support member has a wing shape in a cross-sectional view.   
     
     
         2 . A radial gas expander comprising:
 a rotating shaft;   two sets of impeller groups which are configured of impellers fixed to the rotating shaft, and are symmetrically provided in an axial direction; and   a casing by which the rotating shaft is supported in a rotatable manner, and in which a first introduction channel which introduces fluid to an impeller group of a first set, and a second introduction channel which is provided to be adjacent to the first introduction channel and introduces the fluid discharged from the impeller group of the first set to an impeller group of a second set are formed,   wherein the second introduction channel includes:
 a nozzle blade which guides fluid flowing into the impeller; and 
 a support member which is provided in an upstream side of the nozzle blade and which supports wall surfaces of the second introduction channel, wherein the wall surfaces are mutually opposed, and 
   wherein the support member has a wing shape in a cross-sectional view.   
     
     
         3 . The radial gas expander according to  claim 1 ,
 wherein a plurality of the support members are provided around the rotating shaft, and a width of the support member is formed to be gradually narrowed from an outer circumferential in a radial direction toward an inner circumferential so that clearances between the support members are equal in the radial direction.   
     
     
         4 . The radial gas expander according to  claim 1 ,
 wherein the casing includes a casing main body and a plurality of diaphragms which are built in the casing main body and are integrally connected, and   wherein the introduction channel is formed between the diaphragms.   
     
     
         5 . The radial gas expander according to  claim 2 ,
 wherein a plurality of the support members are provided around the rotating shaft, and a width of the support member is formed to be gradually narrowed from an outer circumferential in a radial direction toward an inner circumferential so that clearances between the support members are equal in the radial direction.   
     
     
         6 . The radial gas expander according to  claim 2 ,
 wherein the casing includes a casing main body and a plurality of diaphragms which are built in the casing main body and are integrally connected, and   wherein the introduction channel is formed between the diaphragms.   
     
     
         7 . The radial gas expander according to  claim 3 ,
 wherein the casing includes a casing main body and a plurality of diaphragms which are built in the casing main body and are integrally connected, and   wherein the introduction channel is formed between the diaphragms.   
     
     
         8 . The radial gas expander according to  claim 5 ,
 wherein the casing includes a casing main body and a plurality of diaphragms which are built in the casing main body and are integrally connected, and   wherein the introduction channel is formed between the diaphragms.