Scroll-Type Fluid Machine

Abstract

To provide a scroll-type fluid machine in which the influence on power recovery efficiency of a clearance in an expansion section is reduced. A scroll-type fluid machine ( 100 ) includes: a scroll unit ( 20 ) in which a fixed scroll ( 3 ) and an orbiting scroll ( 4 ) are disposed and an expansion section ( 1 ) and a compression section ( 2 ) are formed; and a support part ( 30 ) that supports the orbiting scroll ( 3 ) so as to be able to perform revolving motion, the compression section ( 2 ) being driven by power recovered in the expansion section ( 1 ). A minimum clearance between a wrap ( 3 L) of the fixed scroll ( 3 ) and a wrap ( 4 L) of the orbiting scroll ( 4 ) in the expansion section ( 1 ) is set to be less than a minimum clearance between the wrap ( 3 L) of the fixed scroll ( 3 ) and the wrap ( 4 L) of the orbiting scroll ( 4 ) in the compression section ( 2 ).

1 . A scroll-type fluid machine comprising:
 a scroll unit in which a fixed scroll and an orbiting scroll, each having a volute wrap formed therein, are disposed with the wraps facing each other, and in which an expansion section for expanding a working fluid and a compression section for compressing a working fluid are formed between the volute wrap of the fixed scroll and the volute wrap of the orbiting scroll; and   a support part that supports the orbiting scroll so as to be able to perform revolving motion with respect to the fixed scroll,   the compression section being driven by power recovered in the expansion section,   wherein a minimum clearance between the wrap of the fixed scroll and the wrap of the orbiting scroll in the expansion section is set to be less than a minimum clearance between the wrap of the fixed scroll and the wrap of the orbiting scroll in the compression section.   
     
     
         2 . The scroll-type fluid machine according to  claim 1 , wherein the minimum clearance is at least one of clearances in a radial direction and an axial direction of the scroll unit. 
     
     
         3 . The scroll-type fluid machine according to  claim 1 , wherein the orbiting scroll forming the expansion section and the orbiting scroll forming the compression section are formed on the same surface of the same member. 
     
     
         4 . The scroll-type fluid machine according to  claim 1 , wherein the orbiting scroll forming the expansion section and the orbiting scroll forming the compression section are formed on separate members and wrap non-formation surfaces of the members are disposed to face each other. 
     
     
         5 . The scroll-type fluid machine according to  claim 4 , further comprising a connecting shaft that connects the orbiting scroll forming the expansion section and the orbiting scroll forming the compression section, and transmits a rotational driving force generated in the expansion section by expansion of the working fluid, to the compression section.