Apparatus and method for aligning scroll compressor

Abstract

Alignment is performed in a short time without reducing aligning accuracy. In performing the determination of the relative positions (alignment) of a fixed scroll and an orbiting scroll, both revolution compensation and translation compensation are performed by one measurement operation.

1 . An apparatus for aligning a scroll compressor, which has a compression section which is internally formed a hermetically closed working chamber by bringing scroll wraps of a fixed scroll and an orbiting scroll into mesh with each other, a main frame which supports the compression section, and a crank shaft which is connected to the orbiting scroll at a top end thereof, and performs positioning of the scroll wraps of the scroll compressor including a driving shaft held by the main frame while revolving the orbiting scroll via the driving shaft, comprising: 
 X-Y moving means which is restricted in revolutions in a θ direction around a Z axis and supports the main frame or the fixed scroll so as to be movable in directions of an X axis and a Y axis;    θ revolution compensation means which is restricted in movements in the directions of the X axis and the Y axis and supports the orbiting scroll or the fixed scroll via the main frame so as to be revolvable in the θ direction around the Z axis;    orbiting scroll driving means which is connected to the driving shaft and drives the orbiting scroll;    X-Y displacement measuring means which detects a moving displacement of the fixed scroll or the main frame in the directions of the X axis and the Y axis, which result from an orbital motion of the orbiting scroll; and    control means which controls at least the X-Y moving means, the θ revolution compensation means, the orbiting scroll driving means and the X-Y displacement measuring means,    wherein the control means measures a moving displacement of the fixed scroll or the main frame, which results from the revolutions of the driving shaft, by use of the X-Y displacement measuring means by revolving and driving the driving shaft by use of the orbiting scroll driving means and by revolving the orbiting scroll or the fixed scroll in increments of a prescribed angle of θ° by use of the θ revolution compensation means each time the driving shaft performs a prescribed revolution,    performs revolution compensation from obtained measured values by controlling the θ revolution compensation means so that the moving displacement of the fixed scroll or the main frame becomes a minimum, and    performs translation compensation by determining an optimum position of the fixed scroll or the main frame from the measured values on the basis of displacement components in the directions of the X axis and the Y axis and by moving the fixed scroll or the main frame to the optimum position.    
   
   
       2 . The apparatus for aligning a scroll compressor according to  claim 1 , wherein the control means performs arithmetic processing as stated in Formula 1 below, determines an optimum position (Xc, Yc) of the fixed scroll or the main frame and performs translation compensation on the basis of the optimum position,  
     [Formula 1]  
     
       
         
           
             
               
                 
                   
                     ( 
                     
                       
                         X 
                         C 
                       
                       , 
                       
                         Y 
                         C 
                       
                     
                     ) 
                   
                   = 
                   
                     { 
                     
                       
                         
                           ( 
                           
                             
                               X 
                               max 
                             
                             + 
                             
                               X 
                               min 
                             
                           
                           ) 
                         
                         2 
                       
                       , 
                       
                         
                           ( 
                           
                             
                               Y 
                               max 
                             
                             + 
                             
                               Y 
                               min 
                             
                           
                           ) 
                         
                         2 
                       
                     
                     } 
                   
                 
               
               
                 
                   Formula 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   1 
                 
               
             
           
         
       
     
     where a maximum point and a minimum point of a locus of the fixed scroll or the main frame in the direction of the X axis which are obtained when the driving shaft performs one revolution are denoted respectively by Xmax and Xmin, and a maximum point and a minimum point of the locus in the direction of the Y axis are denoted respectively by Ymax and Ymin.  
   
   
       3 . The apparatus for aligning a scroll compressor according to  claim 1 , wherein the control means performs arithmetic processing as stated in Formula 2 below, determines an optimum position (Xc, Yc) of the fixed scroll or the main frame and performs translation compensation on the basis of the optimum position,  
     [Formula 2]  
     
       
         
           
             
               
                 
                   
                     ( 
                     
                       
                         X 
                         c 
                       
                       , 
                       
                         Y 
                         c 
                       
                     
                     ) 
                   
                   = 
                   
                     { 
                     
                       
                         
                           
                             ∑ 
                             
                               i 
                               = 
                               1 
                             
                             n 
                           
                           ⁢ 
                           
                             X 
                             i 
                           
                         
                         n 
                       
                       , 
                       
                         
                           
                             ∑ 
                             
                               i 
                               = 
                               1 
                             
                             n 
                           
                           ⁢ 
                           Y 
                         
                         n 
                       
                     
                     } 
                   
                 
               
               
                 
                   Formula 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   2 
                 
               
             
           
         
       
     
     where the number of all samplings of a locus of the fixed scroll or the main frame in the directions of the X axis and Y axis which are obtained when the driving shaft performs one revolution is denoted by n.  
   
   
       4 . The apparatus for aligning a scroll compressor according to  claim 1 , wherein the control means performs arithmetic processing as stated in Formula 3 below, determines an optimum position (Xc, Yc) of the fixed scroll or the main frame and performs translation compensation on the basis of the optimum position,  
     [Formula 3]  
     
       
         
           
             
               
                 
                   
                     ( 
                     
                       
                         X 
                         c 
                       
                       , 
                       
                         Y 
                         c 
                       
                     
                     ) 
                   
                   = 
                   
                     { 
                     
                       
                         
                           
                             X 
                             C1 
                           
                           + 
                           
                             X 
                             C2 
                           
                         
                         2 
                       
                       , 
                       
                         
                           
                             Y 
                             C1 
                           
                           + 
                           
                             Y 
                             C2 
                           
                         
                         2 
                       
                     
                     } 
                   
                 
               
               
                 
                   Formula 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   3 
                 
               
             
           
         
       
     
     where an optimum compensation angle of the orbiting scroll or the fixed scroll is denoted by θc, a maximum displacement difference when the revolution angle of the orbiting scroll or the fixed scroll is θ1 is denoted by GAP1, the center of the locus in the directions of the X axis and the Y axis at this time is denoted by (X c1 , Y c1 ), a maximum displacement difference when the revolution angle is θ2 is denoted by GAP2, with the optimum compensation angle θc being intermediate between θ1 and θ2, the center of the locus in the directions of the X axis and the Y axis at this time is denoted by (X c2 , Y c2 ), and the relationship GAP1 £≈GAP2 holds in the maximum displacement difference.  
   
   
       5 . The apparatus for aligning a scroll compressor according to  claim 1 , wherein the apparatus for aligning a scroll compressor further comprises abnormality detecting means which is connected to the driving shaft and detects an abnormality in the orbiting scroll driving means which drives the orbiting scroll.  
   
   
       6 . A method for aligning a scroll compressor, which uses a compression section which is internally formed a hermetically closed working chamber by bringing scroll wraps of a fixed scroll and an orbiting scroll into mesh with each other, a main frame which supports the compression section, and a crank shaft which is connected to the orbiting scroll at a top end thereof, and performs positioning of the scroll wraps of the scroll compressor including a driving shaft held by the main frame while revolving the orbiting scroll via the driving shaft, wherein the method uses: 
 X-Y moving means which is restricted in revolutions in a θ direction around a Z axis and supports the main frame or the fixed scroll so as to be movable in directions of an X axis and a Y axis;    θ revolution compensation means which is restricted in movements in the directions of the X axis and the Y axis and supports the orbiting scroll or the fixed scroll via the main frame so as to be revolvable in the θ direction around the Z axis;    orbiting scroll driving means which is connected to the driving shaft and drives the orbiting scroll;    X-Y displacement measuring means which detects a moving displacement of the fixed scroll or the main frame in the directions of the X axis and the Y axis, which result from an orbital motion of the orbiting scroll; and    control means which controls at least the X-Y moving means, the θ revolution compensation means, the orbiting scroll driving means and the X-Y displacement measuring means,    and wherein the method comprises:    a displacement measuring step of measuring a moving displacement of the fixed scroll or the main frame, which results from the revolutions of the driving shaft, by use of the X-Y displacement measuring means by revolving and driving the driving shaft by use of the orbiting scroll driving means and by revolving the orbiting scroll or the fixed scroll in increments of a prescribed angle of θ° by use of the θ revolution compensation means each time the driving shaft performs a prescribed revolution,    a revolution compensation step of performing revolution compensation from obtained measured values by controlling the θ revolution compensation means so that the moving displacement of the fixed scroll or the main frame becomes a minimum and    a translation compensation step of performing translation compensation by determining an optimum position of the fixed scroll or the main frame from the measured values on the basis of displacement components in the directions of the X axis and the Y axis and by moving the fixed scroll or the main frame to the optimum position.