CO-ROTATING SCROLL COMPRESSOR

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.