Scroll type fluid machine

Abstract

A shell-integrated fixed scroll includes a cylindrical shell that is integrated with an end plate on which a scroll wrap is erected, and has a proximal end entirely connected with an outer periphery of the end plate and a leading end extending in the axial direction. The wall of the shell partially forms a thick portion having a large thickness from a proximal-end-side end (first) surface to a leading-end-side end (second) surface. In the thick portion, a screw hole for a bolt for fastening a rear housing to the first surface extends from the first surface toward the second surface. A screw hole for a bolt for fastening a front housing to the second surface extends from the second surface toward the first surface. The thick portion is partially cut away in the circumferential direction between the two surfaces to form opposing surfaces facing each other in the axial direction.

1 . A scroll type fluid machine comprising an orbiting scroll and a fixed scroll, in which the fixed scroll comprises:
 a volute scroll wrap that is erected on an end plate;   a cylindrical shell that is integrated with the end plate and has a proximal end entirely connected with an outer periphery of the end plate and a leading end extending in the direction in which the scroll wrap is erected; and   a thick portion formed by partially increasing the thickness of a wall of the shell from a proximal-end-side end surface of the shell to a leading-end-side end surface of the shell so that in the thick wall of the shell, a screw hole for a first bolt for fastening a first housing to the proximal-end-side end surface extends from the proximal-end-side end surface toward the leading-end-side end surface, and a screw hole for a second bolt for fastening a second housing to the leading-end-side end surface extends from the leading-end-side end surface toward the proximal-end-side end surface,   wherein the thick portion is partially cut away in a circumferential direction of the shell between the proximal-end-side end surface and the leading-end-side end surface to form opposing surfaces that face each other in the axial direction.   
     
     
         2 . The scroll type fluid machine according to  claim 1 , wherein the opposing surfaces are respectively locked with a locking member, and function as an operating point at which a load is applied to the fixed scroll in the axial direction by way of the locking member. 
     
     
         3 . The scroll type fluid machine according to  claim 1  or  2 , wherein the wall of the shell except the thick portion is formed with a thickness not enough to cut away in the circumferential direction so as to maintain strength of the shell. 
     
     
         4 . The scroll type fluid machine according to  claim 3 , wherein the thickness of the wall of the shell except the thick portion is not enough to form a screw hole for the first bolt and a screw hole for the second bolt. 
     
     
         5 . The scroll type fluid machine according to  claim 1 , wherein the screw hole for the first bolt and the screw hole for the second bolt overlap each other in the axial direction. 
     
     
         6 . The scroll type fluid machine according to  claim 2 , wherein the wall of the shell except the thick portion is formed with a thickness not enough to cut away in the circumferential direction so as to maintain strength of the shell. 
     
     
         7 . The scroll type fluid machine according to any one of  claim 2 , wherein the screw hole for the first bolt and the screw hole for the second bolt overlap each other in the axial direction. 
     
     
         8 . The scroll type fluid machine according to any one of  claim 3 , wherein the screw hole for the first bolt and the screw hole for the second bolt overlap each other in the axial direction. 
     
     
         9 . The scroll type fluid machine according to any one of  claim 4 , wherein the screw hole for the first bolt and the screw hole for the second bolt overlap each other in the axial direction.