Rotary assembly for a turbomachine fan

1. A rotary assembly for a turbomachine fan, the assembly comprising:

a disk rotatable about an axis;

a plurality of blades, each blade having a root, each root being fastened to said disk, and each blade extending radially outwards from said disk; and

a plurality of inter-blade platforms, each extending between two adjacent blades and defining an inner profile of a flow section for a fluid passing through the fan;

wherein said adjacent blades present slides on their facing side faces, these slides being situated outside the disk and limiting outward radial movement of said platform,

wherein each of said platforms is a one-piece cylindrical element consisting entirely of a C-shaped section and comprises:

an outer wall extending in a circumferential direction relative to the disk, the outer wall defining the inner profile of the flow section for the fluid passing through the fan,

two side walls extending substantially in a radial direction, and

two inner walls extending the side walls and being folded towards the middle of the platform, said inner walls extending in a circumferential direction relative to the disk without meeting each other, and

wherein the inner walls rest on an outermost surface of the disk.

2. The rotary assembly according to claim 1 , including flanges against which the upstream and downstream edges of said platform come into abutment, so as to limit axial movement of said platform.

3. The rotary assembly according to claim 1 , wherein said slides project.

4. The rotary assembly according to claim 1 , wherein inward radial movement of said platform is limited by the outermost surface of the disk.

5. The rotary assembly according to claim 4 , wherein said slides and the outermost surface of the rotary disk define between them a housing within which said platform can slide, and wherein, in radial section, the outline of the platform and the outline of said housing present shapes that are complementary.

6. The rotary assembly according to claim 1 , wherein each of said facing side faces carries an outer slide and an inner slide, the two outer slides limiting outward radial movement of said platform, and the two inner slides limiting inward radial movement of said platform.

7. The rotary assembly according to claim 1 , wherein said platform presents grooves extending along its side faces, each groove housing a slide, at least in part.

8. The rotary assembly according to claim 7 , wherein said grooves are situated at the intersections between the side faces and the outer face of said platform, said grooves housing the inner portions of the slides such that the outer face of said platform extends the outer faces of the slides.

9. The rotary assembly according to claim 1 , wherein the outer wall, the side walls, and the inner walls each include an inner surface and an outer surface opposite the inner surface, and the outer surfaces of the inner walls abut the outermost surface of the disk.

10. The rotary assembly according to claim 9 , wherein the inner surfaces of the side walls face each other, and the outer surfaces of the side walls abut the facing side faces of the adjacent blades.

11. The rotary assembly according to claim 9 , wherein the inner surface of the outer wall faces the inner surfaces of the inner walls.

12. A turbomachine fan including a rotary assembly, said rotary assembly comprising:

a disk rotatable about an axis;

a plurality of blades, each blade having a root, each root being fastened to said disk, and each blade extending radially outwards from said disk; and

a plurality of inter-blade platforms, each extending between two adjacent blades and defining an inner profile of a flow section for a fluid passing through the fan;

wherein said adjacent blades present slides on their facing side faces, these slides being situated outside the disk and limiting outward radial movement of said platform, and

wherein each of said platforms is a one-piece cylindrical element consisting entirely of a C-shaped section and comprises:

an outer wall extending in a circumferential direction relative to the disk, the outer wall defining the inner profile of the flow section for the fluid passing through the fan,

two side walls extending substantially in a radial direction, and

two inner walls extending the side walls and being folded towards the middle of the platform, said inner walls extending in a circumferential direction relative to the disk without meeting each other, and

wherein the inner walls rest on an outermost surface of the disk.

13. A turbomachine including a fan, said fan including a rotary assembly, said rotary assembly comprising:

a disk rotatable about an axis;

a plurality of blades, each blade having a root, each root being fastened to said disk, and each blade extending radially outwards from said disk; and

a plurality of inter-blade platforms, each extending between two adjacent blades and defining an inner profile of a flow section for a fluid passing through the fan;

wherein said adjacent blades present slides on their facing side faces, these slides being situated outside the disk and limiting outward radial movement of said platform, and

wherein each of said platforms is a one-piece cylindrical element consisting entirely of a C-shaped section and comprises:

an outer wall extending in a circumferential direction relative to the disk, the outer wall defining the inner profile of the flow section for the fluid passing through the fan,

two side walls extending substantially in a radial direction, and

two inner walls extending the side walls and being folded towards the middle of the platform, said inner walls extending in a circumferential direction relative to the disk without meeting each other, and

wherein the inner walls rest on an outermost surface of the disk.