Deflector for a combustion chamber endwall, combustion chamber equipped therewith and turbine engine comprising them

1. A deflector for a chamber endwall of a combustion chamber of a turbine engine, comprising:

a plate provided with a hole,

wherein said plate is a portion of a conical surface of revolution about a cone axis, said plate including a substantially concave face and a substantially convex face,

said plate includes a contour which possesses four sides, of which two first sides are concentric circular arcs centered on said cone axis, and two second sides are segments of generatrices of said cone which connect said first sides, and

said deflector further comprises a central region which surrounds said hole and a peripheral region which surrounds said central region, said central region including a planar face on the same side as said substantially concave face and being a plane portion bounded by two edges which are segments of generatrices of said cone which are substantially parallel to said second sides.

2. The deflector as claimed in claim 1 , wherein said central region is substantially circular.

3. The deflector as claimed in claim 2 , which has a connection region between said peripheral region and said central region.

4. The deflector as claimed in claim 1 , wherein said first sides of the plate forming the deflector are each provided with a lip extending on the same side as the concave face of the deflector.

5. A combustion chamber comprising at least one deflector as claimed in claim 1 .

6. The combustion chamber as claimed in claim 5 , wherein said deflector is fastened by brazing to the chamber endwall.

7. The combustion chamber as claimed in claim 5 , further comprising an angular positioning device.

8. The combustion chamber as claimed in claim 7 , wherein said angular positioning device includes a first locking keyway which receives a locking key.

9. The combustion chamber as claimed in claim 7 , wherein said angular positioning device includes a second locking keyway which cooperates with a stop finger.

10. The combustion chamber as claimed in claim 5 , wherein said combustion chamber is a “convergent” combustion chamber which includes an external wall and an internal wall which are coaxial and substantially frustoconical and are inclined by widening out from downstream to upstream.

11. A turbine engine which comprises a combustion chamber as claimed in claim 5 .

12. A combustion chamber of a turbine engine, comprising:

an internal wall;

an external wall;

a chamber endwall connecting the internal wall and the external wall at an upstream end of the combustion chamber;

a deflector installed on the chamber endwall, the deflector including a plate provided with a substantially central injection hole with a raised edge provided on the same side as an upstream face of the deflector; and

an injection system provided at the chamber endwall, the injection system including an injection bowl including a flange with a mounting rim, and a collar disposed inside the combustion chamber, separated prom the flange by a channel and extending substantially parallel to the mounting rim,

wherein the plate is a portion of a conical surface of revolution about a cone axis and includes a substantially concave face, a substantially convex face, and a contour with first and second sides which are concentric circular arcs centered on the cone axis and third and fourth sides which are segments of generatrices of the cone connecting the first and second sides,

wherein the mounting rim is axially retained between a first ring and the edge of the injection hole,

wherein the chamber endwall is immobilized between an outer shoulder of the edge of the injection hole and a second ring which is brazed in an outer peripheral groove in the edge of the injection hole, and

wherein the second ring includes an inner shoulder in which the first ring is fitted and the first ring and the second ring are welded.

13. The combustion chamber as claimed in claim 12 , wherein the deflector further comprises a central region which surrounds said central injection hole with a planar face on the same side as said substantially concave face, and a peripheral region which surrounds said central region.

14. The combustion chamber as claimed in claim 13 , wherein the central region is a plane portion bounded by two edges which are segments of generatrices of said cone which are substantially parallel to said third and fourth sides.