Scroll Fluid Machine

Abstract

A scroll fluid machine having a scroll unit that includes a fixed scroll ( 36 ) and a movable scroll ( 38 ) that are each constructed from an end plate and a scroll wall integral with the end plate, and also includes a chip seal ( 42 ) provided at the tip of the scroll wall of one of the scrolls and in relative sliding contact with the end plate of the other scroll. For example, a part (radial projection) of a chip seal ( 42 ) on the movable scroll side is projected from an outer wall surface of a scroll wall ( 38 b ), and when a pressure chamber is formed between the fixed scroll and the movable scroll, the radial projection is in relative sliding contact with the inner wall surface of a scroll wall ( 36 b ) of the fixed scroll to secure a fine gap (G) between the inner and outer wall surfaces. The simple structure as above can relax conditions of sliding between the scroll walls with sealability of the pressure chamber maintained, and the scroll fluid machine has excellent durability.

1 . A scroll fluid machine having a scroll unit that comprises a fixed scroll and a movable scroll each constructed from an end plate and a scroll wall integral with said end plate, and comprises a chip seal provided at a tip of a scroll wall of one of said scrolls and in relative sliding contact with an end plate of the other scroll, characterized in that said scroll unit further comprises a radial projection provided on a first wall surface as one of wall surfaces of said scroll walls facing each other and being in relative sliding contact with a second wall surface as the other wall surface to secure a fine gap between said wall surfaces when a pressure chamber is formed between said fixed scroll and said movable scroll. 
   
   
       2 . The scroll fluid machine according to  claim 1 , wherein said radial projection is formed integrally with said chip seal. 
   
   
       3 . The scroll fluid machine according to  claim 2 , wherein said chip seal includes a top seal surface which is in relative sliding contact with said end plate of said the other scroll, and a sliding contact surface which is connected perpendicularly to a side edge of said top seal surface and which is positioned relatively to said first wall surface with a distance corresponding to said fine gap. 
   
   
       4 . The scroll fluid machine according to  claim 2 , wherein said scroll unit further comprises a holding means for holding said chip seal at said tip of said scroll wall. 
   
   
       5 . The scroll fluid machine according to  claim 4 , wherein said holding means comprises a recessed portion and a projected portion which are provided on said chip seal and said scroll wall and which are engaged with each other. 
   
   
       6 . The scroll fluid machine according to  claim 4 , wherein said holding means comprises an adhesive layer. 
   
   
       7 . The scroll fluid machine according to  claim 1 , wherein said chip seal is made of one material selected from the group consisting of a polyphenylenesulfide group resin, a polyetheretherketone group resin and a polyimide group resin. 
   
   
       8 . The scroll fluid machine according to  claim 1 , wherein a motor is further provided, and said scroll unit is provided on each end of a rotational shaft of said motor.