Scroll-Type Fluid Machine

Abstract

A scroll-type fluid machine ( 1, 88 ) in which a fixed scroll ( 8 ) and a movable scroll ( 10 ), in consort, demarcate a compression or expansion chamber ( 60 ) of a lubricant-containing working fluid, the fluid machine having a housing ( 4 ) provided with a port ( 16 ) through which the working fluid passes, and a pedestal section ( 62 ) in which the port opens, and which is applied with thrust load on the back face ( 64 ) side of an end plate ( 10 a ) of the movable scroll due to the demarcation of the compression or expansion chamber. The pedestal section has a groove ( 72, 90 ) formed in a region including an opening of the port.

1 . A scroll-type fluid machine in which a fixed scroll and a movable scroll, in consort, demarcate a compression or expansion chamber of a lubricant-containing working fluid, the fluid machine comprising:
 a housing provided with a port through which the working fluid passes, and a pedestal section in which the port opens, and which is applied with thrust load on the back face side of an end plate of the movable scroll due to the demarcation of the compression or expansion chamber, characterized in that:   the pedestal section has a groove formed in a region including an opening of the port.   
     
     
         2 . The scroll-type fluid machine according to  claim 1 , characterized in that the groove is formed along an inner circumferential surface of the housing. 
     
     
         3 . The scroll-type fluid machine according to  claim 1 , characterized in that the groove is formed in a ring-like shape along the inner circumferential surface of the housing. 
     
     
         4 . The scroll-type fluid machine according to  claim 1 , characterized in that the groove has sectional area in a radial direction of the movable scroll, which becomes smaller with increasing distance from the opening. 
     
     
         5 . The scroll-type fluid machine according to  claim 1 , characterized in that the groove has a terminal portion on the opposite side of the opening as viewed in the radial direction of the movable scroll on the basis of an axis of a shaft interlocked with the movable scroll. 
     
     
         6 . The scroll-type fluid machine according to  claim 1 , characterized in that a thrust plate is provided between the pedestal section and the end plate, and the thrust plate is applied with the thrust load of the movable scroll at a sliding-contact face with which the back face comes into sliding contact. 
     
     
         7 . The scroll-type fluid machine according to  claim 6 , characterized in that the sliding-contact face of the thrust plate is increased in area with increasing distance from the opening. 
     
     
         8 . The scroll-type fluid machine according to  claim 6 , characterized in that the thrust plate has such a shape as to occlude the groove with increasing distance from the opening. 
     
     
         9 . The scroll-type fluid machine according to  claim 7 , characterized in that a coordinate origin of a volute of the movable scroll is positioned on the opposite side of the opening as viewed in the radial direction of the movable scroll on the basis of the axis of the shaft interlocked with the movable scroll. 
     
     
         10 . The scroll-type fluid machine according to  claim 1 , characterized by being a horizontal type in which a pivot line of the movable scroll is horizontal.