Rotary fluid machine

Abstract

A rotary fluid machine is provided that includes a rotor rotatably housed within a casing, a hollow rotating shaft ( 113 ) that rotates integrally with the rotor, and a fixed shaft ( 102 ) that is relatively rotatably fitted into the inner periphery of the rotating shaft ( 113 ); in which the rotating shaft ( 113 ) is formed by shrink-fitting an outer sleeve ( 21 ) made of metal around the outer periphery of an inner sleeve ( 85 ) made of ceramic, etc. having a lower coefficient of thermal expansion than that of metal, and the fixed shaft ( 102 ) is formed by shrink-fitting an outer sleeve ( 88 ) made of metal around the outer periphery of an inner sleeve ( 87 ) made of ceramic, etc. having a lower coefficient of thermal expansion than that of metal. Since thermal expansion of the outer sleeves ( 21, 88 ) fitted around the outer peripheries of the inner sleeves ( 85, 87 ) is suppressed due to residual tensile stress of the outer sleeves ( 21, 88 ), intimate contact between the outer sleeves ( 21, 88 ) and the inner sleeves ( 85, 87 ) can be maintained.

1 . A rotary fluid machine comprising a rotor ( 41 ) rotatably housed within a casing ( 11 ), a hollow rotating shaft ( 113 ) that rotates integrally with the rotor ( 41 ), a fixed shaft ( 102 ) that is fixed to the casing ( 11 ), and a rotary valve (V) that is formed on sliding surfaces of the fixed shaft ( 102 ) and the rotating shaft ( 113 ) and controls the supply and discharge of a high temperature gas-phase working medium; 
 characterized in that at least the inner periphery of the rotating shaft ( 113 ) is formed by shrink-fitting an outer sleeve ( 21 ) made of metal around the outer periphery of an inner sleeve ( 85 ) made of a material having a lower coefficient of thermal expansion than that of metal.    
   
   
       2 . A rotary fluid machine comprising a rotor ( 41 ) rotatably housed within a casing ( 11 ), a hollow rotating shaft ( 113 ) that rotates integrally with the rotor ( 41 ), a fixed shaft ( 102 ) that is fixed to the casing ( 11 ), and a rotary valve (V) that is formed on sliding surfaces of the fixed shaft ( 102 ) and the rotating shaft ( 113 ) and controls the supply and discharge of a high temperature gas-phase working medium; 
 characterized in that at least the outer periphery of the fixed shaft ( 102 ) is formed by shrink-fitting an outer sleeve ( 88 ) made of metal around the outer periphery of an inner sleeve ( 87 ) made of a material having a lower coefficient of thermal expansion than that of metal.    
   
   
       3 . A rotary fluid machine comprising a rotor ( 41 ) rotatably housed within a casing ( 11 ), a hollow rotating shaft ( 113 ) that rotates integrally with the rotor ( 41 ), a fixed shaft ( 102 ) that is fixed to the casing ( 11 ), and a rotary valve (V) that is formed on sliding surfaces of the fixed shaft ( 102 ) and the rotating shaft ( 113 ) and controls the supply and discharge of a high temperature gas-phase working medium; 
 characterized in that at least the inner periphery of the rotating shaft ( 113 ) is formed by shrink-fitting an outer sleeve ( 21 ) made of metal around the outer periphery of an inner sleeve ( 85 ) made of a material having a lower coefficient of thermal expansion than that of metal, and at least the outer periphery of the fixed shaft ( 102 ) is formed by shrink-fitting an outer sleeve ( 88 ) made of metal around the outer periphery of an inner sleeve ( 87 ) made of a material having a lower coefficient of thermal expansion than that of metal.    
   
   
       4 . The rotary fluid machine according to  claim 2 , wherein the outer periphery of the outer sleeve ( 88 ) of the fixed shaft ( 102 ), the outer sleeve being made of metal, is subjected to coating with a low friction material.  
   
   
       5 . The rotary fluid machine according to  claim 3 , wherein the outer periphery of the outer sleeve ( 88 ) of the fixed shaft ( 102 ), the outer sleeve being made of metal, is subjected to coating with a low friction material.