Scroll type compressor

Abstract

A scroll type compressor has a fixed scroll member and a movable scroll member. The fixed scroll member has a fixed scroll base plate and a fixed scroll wall extending from the fixed scroll base plate. The movable scroll member has a movable scroll base plate and a movable scroll wall extending from the movable scroll base plate. The fixed scroll member and the movable scroll member cooperatively form a compression region. The movable scroll member orbits relative to the fixed scroll member to compress refrigerant in the compression region. Each scroll wall is formed in a taper shape from each base plate toward each distal end of the scroll wall. The distal end is non-contact with the opposing scroll base plate. Clearance between the distal end and the opposing scroll base plate is less than or equal to the limit clearance value which maintains airtight performance.

What is claimed is:  
     
         1 . A scroll type compressor comprising: 
 a fixed scroll member having a fixed scroll base plate and a fixed scroll wall extending from the fixed scroll base plate; and    a movable scroll member having a movable scroll base plate and a movable scroll wall extending from the movable scroll base plate, wherein the fixed scroll member and the movable scroll member cooperatively form a compression region, and wherein the movable scroll member orbits relative to the fixed scroll member to compress refrigerant in the compression region, and wherein each scroll wall is formed in a taper shape from each base plate toward each distal end of the scroll wall, the distal end being non-contact with the opposing scroll base plate, clearance between the distal end and the opposing scroll base plate being less than or equal to the limit clearance value which maintains airtight performance between the distal end and the opposing scroll base plate.    
     
     
         2 . The scroll type compressor according to  claim 1  wherein the side surface of the fixed scroll wall and the side surface of the movable scroll wall, which are facing each other, have an equal inclination angle with respect to the direction of an axis which is perpendicular to the base plate.  
     
     
         3 . The scroll type compressor according to  claim 2  wherein the side surfaces of the fixed scroll wall and the movable scroll wall have an equal inclination angle with respect to the direction of the axis.  
     
     
         4 . The scroll type compressor according to  claim 1  wherein the limit clearance value is less than or equal to 60 μm when circulating oil exists in the compression region.  
     
     
         5 . The scroll type compressor according to  claim 4  wherein the limit clearance value is less than or equal to 36 μm.  
     
     
         6 . The scroll type compressor according to  claim 1  wherein the limit clearance value is less than or equal to 47 μm when no circulating oil exists in the compression region.  
     
     
         7 . The scroll type compressor according to  claim 6  wherein the limit clearance value is less than or equal to 30 μm.  
     
     
         8 . The scroll type compressor according to  claim 1  wherein each scroll wall is formed in a taper shape from each base plate toward each distal end of the scroll wall by utilizing a draft upon casting.  
     
     
         9 . A scroll fluid machine comprising: 
 a fixed scroll member having a fixed scroll base plate and a fixed scroll wall extending from the fixed scroll base plate; and    a movable scroll member having a movable scroll base plate and a movable scroll wall extending from the movable scroll base plate, wherein the fixed scroll member and the movable scroll member cooperatively form a compression region, and wherein the movable scroll member orbits relative to the fixed scroll member to compress fluid in the compression region, and wherein each scroll wall is formed in a taper shape from each base plate toward each distal end of the scroll wall, the distal end being non-contact with the opposing scroll base plate, clearance between the distal end and the opposing scroll base plate being less than or equal to the limit clearance value which maintains airtight performance between the distal end and the opposing scroll base plate.