Scroll Fluid Machine

Abstract

Disclosed is a scroll fluid machine wherein a scroll unit achieves higher performance while maintaining reliability. The disclosed scroll fluid machine is provided with: a first actuation chamber ( 100 ) and second actuation chamber ( 102 ) partitioned by the central end ( 98 ) of a wrap ( 48, 64 ) of a fixed scroll ( 44, 60 ) and the central end ( 96 ) of a wrap ( 46, 62 ) of a movable scroll ( 42, 58 ); and a connection path ( 106, 119, 112 ). When at least part of a connection hole ( 52, 72 ) gets blocked by the central end of the wrap of the movable scroll as the movable scroll moves in a circle, the connection path connects the first and second actuation chambers with the connection hole. When the central ends of the wraps of the fixed and movable scrolls abut against each other, the connection path cuts off the connection between the first and second actuation chambers and the connection hole.

1 . A scroll fluid machine, characterized by comprising:
 a scroll unit configured to include fixed and movable scrolls in which spiral wraps are each erected to face each other on each base surface of each end plate and form actuation chambers of a working fluid between respective wraps of the fixed and movable scrolls by revolvably moving the movable scroll around a shaft center of the fixed scroll;   a connection hole formed to penetrate through a central portion of the end plate of the fixed scroll and connecting the actuation chambers with an outside of the scroll unit;   a first actuation chamber partitioned into an outer wall of a central end of the wrap of the fixed scroll and an inner wall of the central end of the wrap of the movable scroll;   a second actuation chamber partitioned into an inner wall of the central end of the wrap of the fixed scroll and an outer wall of the central end of the wrap of the movable scroll; and   a connection path connecting the first and second actuation chambers with the connection hole when at least a portion of the connection hole is closed by the central end of the wrap of the movable scroll and a connection path blocking the connection between the first and second actuation chambers and the connection hole when the central ends of the wraps of the fixed and movable scrolls abut against each other, due to the revolving motion of the movable scroll.   
     
     
         2 . The scroll fluid machine of  claim 1 , wherein the connection path is the connection groove recessed in a range in which the connection path reaches the connection hole on the base surface of the fixed scroll, and
 the connection groove is formed in a range in which at least a portion of the connection groove is opened in the first and second actuation chambers when at least a portion of the connection hole is blocked by the central end of the wrap of the movable scroll due to the revolving motion of the movable scroll and all of the connection grooves are concealedly covered by the wrap of the movable scroll when the central ends of the wraps of the fixed and movable scrolls abut against each other, due to the revolving motion of the movable scroll.   
     
     
         3 . The scroll fluid machine of  claim 2 , wherein the connection groove connects the first actuation chamber with the second actuation chamber when at least a portion of the connection hole is blocked by the central end of the wrap of the movable scroll. 
     
     
         4 . The scroll fluid machine of  claim 2 , wherein the connection groove connects the first actuation chamber with the second actuation chamber when at least a portion of the connection hole is blocked by the central end of the wrap of the movable scroll. 
     
     
         5 . The scroll fluid machine of  claim 2 , wherein the connection groove is formed in the range in which the opened areas of the connection grooves for each of the first and second actuation chambers are substantially the same when at least a portion of the connection hole is blocked by the central end of the wrap of the movable scroll. 
     
     
         6 . The scroll fluid machine of  claim 3 , wherein the scroll unit has the symmetric scroll structure. 
     
     
         7 . The scroll fluid machine of  claim 2 , wherein the connection groove has the groove width narrower than the width of the central end of the wrap of the movable scroll. 
     
     
         8 . The scroll fluid machine of  claim 1 , wherein the scroll fluid machine is an expander using the actuation chamber as an expansion chamber.