Scroll-Type Fluid Machine

Abstract

A scroll-type fluid machine ( 1 ) in which in which a spiral body ( 50, 52 ) and an end plate ( 8 a, 10 a ) come into sliding contact with each other between fixed and movable scrolls ( 8, 10 ) with a chip seal ( 56, 58 ), which is provided to the spiral body, intervening therebetween. The spiral body of at least one of the scrolls is provided, in the corner on the end plate side thereof, with a base portion ( 62 ) formed of a concave arc face ( 64 ), and the chip seal of the other scroll is provided, in the corner of a tip end ( 56 a ) thereof, with a fillet ( 70 ) that is formed of a first convex arc face ( 72 ) that comes into sliding contact with the concave arc face.

1 . A scroll-type fluid machine comprising a fixed scroll and a movable scroll each having an end plate and a spiral body integral with the end plate, in which the spiral body and the end plate come into sliding contact with each other between the fixed and movable scrolls with a chip seal, which is provided to the spiral body, intervening therebetween, thus demarcating a pressure chamber of working fluid, which is formed between the spiral bodies, characterized in that:
 the spiral body of at least one of the scrolls has a base portion formed in a corner on the end plate side in the form of a concave arc face, and the chip seal of the other scroll has a fillet formed of a first convex arc face that comes into sliding contact with the concave arc face on the corner of the tip end of the chip seal.   
     
     
         2 . The scroll-type fluid machine according to  claim 1 , characterized in that the chip seal has an engaged portion that is engaged with the spiral body, and the engaged portion is situated on a more inner side than the fillet in a width direction of the chip seal. 
     
     
         3 . The scroll-type fluid machine according to  claim 1 , characterized in that:
 a relationship represented by W 2 >W 1  is satisfied, where the width of the spiral body is W 1 , and the width of the chip seal is W 2 .   
     
     
         4 . The scroll-type fluid machine according to  claim 1 , characterized in that:
 the chip seal has a second convex arc face covering a center end portion of the spiral body, and a relationship represented by R 2 >R 1  is satisfied, where a curvature radius of the first convex arc face is R 1 , and a curvature radius of a second convex arc face is R 2 .   
     
     
         5 . The scroll-type fluid machine according to  claim 1 , characterized in that:
 a relationship represented by (R 0 −0.1 mm)≦R 1 ≦(R 0 +0.1 mm) is satisfied, where a curvature radius of a concave arc face is R 0 , and a curvature radius of the first convex arc face is R 1 .   
     
     
         6 . The scroll-type fluid machine according to  claim 1 , characterized in that:
 the first convex arc face of the fillet is provided with an auxiliary rib for reinforcing the sealing between the first convex arc face and the concave arc face at a third convex arc face, and a relationship represented by R 3 ≦R 0 ≦R 1  is satisfied, where curvature radii of the concave arc face, the first convex arc face and the third convex arc face are R 0 , R 1  and R 3 , respectively.   
     
     
         7 . The scroll-type fluid machine according to  claim 6 , characterized in that:
 a plurality of auxiliary ribs are arranged more densely with decreasing distance to the center end portion of the spiral body.