Co-rotating scroll compressor

Abstract

There is provided a co-rotating scroll compressor in which a driving-side scroll member including a spiral wall between facing end plates can be manufacturable at low cost. A driving-side scroll member (70) includes a first driving-side scroll portion (71), a second driving-side scroll portion (72), and a bolt (31). The first driving-side scroll portion (71) includes a first driving-side end plate (71a) and a first driving-side wall (71b), and is driven by a motor (5). The second driving-side scroll portion (72) includes a second driving-side end plate (72a) and a second driving-side wall (72b). The bolt (31) performs fixing while a front end in a rotation axis direction of the first driving-side wall (71b) and a front end in the rotation axis direction of the second driving-side wall (72b) face each other.

1 . A co-rotating scroll compressor, comprising:
 a driving-side scroll member that is rotationally driven by a driving unit and includes a spiral driving-side wall disposed on a driving-side end plate;   a driven-side scroll member that includes a spiral driven-side wall corresponding to the driving-side wall, the driven-side wall being disposed on a driven-side end plate and engaging with the driving-side wall to form a compression space; and   a synchronous driving mechanism that transmits driving force from the driving-side scroll member to the driven-side scroll member to cause the driving-side scroll member and the driven-side scroll member to perform rotational movement in a same direction at a same angular velocity, wherein   the driving-side scroll member includes a first driving-side scroll portion, a second driving-side scroll portion, and a wall fixing part, the first driving-side scroll portion including a first driving-side end plate and a first driving-side wall and being driven by the driving unit, the second driving-side scroll portion including a second driving-side end plate and a second driving-side wall, and the wall fixing part performing fixing while a front end in a rotation axis direction of the first driving-side wall and a front end in the rotation axis direction of the second driving-side wall face each other, and   the driven-side scroll member includes a first driven-side wall and a second driven-side wall, the first driven-side wall being provided on one side surface of the driven-side end plate and engaging with the first driving-side wall, and the second driven-side wall being provided on another side surface of the driven-side end plate and engaging with the second driving-side wall.   
     
     
         2 . The co-rotating scroll compressor according to  claim 1 , wherein the wall fixing part includes a key groove provided on each of the front end of the first driving-side wall and the front end of the second driving-side wall, and a key member to be inserted into the key grooves. 
     
     
         3 . The co-rotating scroll compressor according to  claim 1 , wherein the wall fixing part includes a groove provided on one of the front end of the first driving-side wall and the front end of the second driving-side wall, and a protrusion that is provided on the other of the front end of the second driving-side wall and the front end of the first driving-side wall and is to be inserted into the groove. 
     
     
         4 . The co-rotating scroll compressor according to  claim 1 , wherein
 the driven-side scroll member includes a first driven-side scroll portion and a second driven-side scroll portion, the first driven-side scroll portion including a first driven-side end plate and a first driven-side wall that is provided on one side surface of the first driven-side end plate and engages with the first driving-side wall, the second driven-side scroll portion including a second driven-side end plate and a second driven-side wall that is provided on one side surface of the second driven-side end plate and engages with the second driving-side wall, and   the first driven-side end plate and the second driven-side end plate are fixed while another side surface of the first driven-side end plate and another side surface of the second driven-side end plate are superimposed.   
     
     
         5 . The co-rotating scroll compressor according to  claim 1 , wherein timing when fluid is compressed and discharged by the first driving-side scroll portion and timing when fluid is compressed and discharged by the second driving-side scroll portion are different from each other. 
     
     
         6 . The co-rotating scroll compressor according to  claim 1 , wherein
 the second driving-side scroll portion includes a discharge port through which fluid compressed by the first driving-side scroll portion as well as fluid compressed by the second driving-side scroll portion are discharged, and   discharge pressure of the fluid compressed by the first driving-side scroll portion is set higher than discharge pressure of the fluid compressed by the second driving-side scroll portion.   
     
     
         7 . The co-rotating scroll compressor according to  claim 1 , wherein the first driving-side wall has a wall height larger than a wall height of the second driving-side wall. 
     
     
         8 . The co-rotating scroll compressor according to  claim 1 , wherein
 the second driving-side scroll portion includes a discharge port through which fluid compressed by the first driving-side scroll portion as well as fluid compressed by the second driving-side scroll portion are discharged, and   the first driving-side wall has a wall height lower than a wall height of the second driving-side wall.   
     
     
         9 . The co-rotating scroll compressor according to  claim 1 , further comprising:
 a first support member that is fixed to a front end side in the axis direction of the first driven-side wall and rotates together with the first driven-side wall, the first driving-side end plate being disposed in between the first support member and the first driven-side wall; and   a second support member that is fixed to a front end side in the axis direction of the second driven-side wall and rotates together with the second driven-side wall, the second driving-side end plate being disposed in between the second support member and the second driven-side wall, wherein   the first driving-side scroll portion and the second driving-side scroll portion are made of materials having a same linear expansion coefficient, and/or the driven-side scroll member, the first support member, and the second support member are made of materials having a same linear expansion coefficient.   
     
     
         10 . The co-rotating scroll compressor according to  claim 9 , wherein the material used for the driven-side scroll member is lower in specific gravity than the materials used for the first driving-side scroll portion and the second driving-side scroll portion. 
     
     
         11 . The co-rotating scroll compressor according to  claim 1 , wherein the driven-side end plate includes a through hole or a notch in a vicinity of an outer peripheral end of the driven-side wall. 
     
     
         12 . The co-rotating scroll compressor according to  claim 11 , wherein the through hole is provided at a position close to a ventral side of the driven-side wall. 
     
     
         13 . The co-rotating scroll compressor according to  claim 1 , wherein
 the driving-side scroll member is not subjected to surface treatment, and   at least a region of the driven-side scroll member coming into contact with the driving-side scroll member is subjected to the surface treatment.   
     
     
         14 . The co-rotating scroll compressor according to  claim 13 , wherein
 a plurality of the driving-side walls are provided at predetermined angular intervals around a center of the driving-side end plate,   the driven-side walls in a number corresponding to the number of driving-side walls are provided at predetermined angular intervals around a center of the driven-side end plate, and   in the first driven-side walls and/or the second driven-side walls, the surface treatment is not performed on an outer peripheral side in a range from a winding end of each of the first driven-side walls and/or the second driven-side walls to an angle that is obtained by dividing π (rad) by the number of the first driven-side walls or the number of the second driven-side walls.   
     
     
         15 . The co-rotating scroll compressor according to  claim 13 , wherein
 a through hole is provided at a center of the driven-side end plate, and   the surface treatment is not performed on an inner peripheral surface forming the through hole.