Turbomachine combustion chamber arrangement having a collar deflector

1. An arrangement for a turbomachine combustion chamber, comprising:

a chamber end wall pierced by at least one substantially circular opening;

a deflector mounted from a downstream side of the chamber end wall in the opening;

an annulus which mounts the deflector in the opening in the chamber end wall;

an injector system associated with the opening and including an annular bowl that is flared downstream which passes through said opening; and

a pinch ring mounted on an upstream side of the chamber end wall which is fastened to the annulus,

wherein the pinch ring cooperates with the annulus to define an inwardly-open annular groove which allows the injector system to shift off-center relative to the chamber end wall,

wherein the deflector includes an annular collar extending radially inwards, and

wherein the bowl of the injector system includes at its downstream end an outwardly-open annular groove which is radially aligned with the collar of the deflector such that the collar of the deflector retracts into said outwardly-open annular groove of the bowl when the injector system shifts off-center relative to the chamber end wall.

2. The arrangement according to claim 1 , wherein the outwardly-open annular groove of the bowl is formed by two side walls that are axially spaced apart and interconnected by an annular bottom wall, the distance between said side walls of the groove being greater than a thickness of the collar of the deflector so as to allow ventilation air to flow regardless of the off-centering of the injector system relative to the chamber end wall.

3. The arrangement according to claim 1 , wherein the bowl of the injector system further includes an annular end plate which slides radially in the inwardly-open annular groove formed by the pinch ring and the annulus.

4. The arrangement according to claim 3 , wherein the end plate of the bowl is extended downstream by a substantially cylindrical portion that is connected to the outwardly-open annular groove by an annular shoulder.

5. The arrangement according to claim 4 , wherein the shoulder of the bowl is pierced by a plurality of ventilation holes open to the upstream side of the chamber end wall and leading to the downstream side thereof in register with the collar of the deflector.

6. The arrangement according to claim 3 , wherein a radial height of the collar of the deflector is not less than a radial height of the end plate of the bowl so as to protect the injector system regardless of the extent to which the injector system is off-center relative to the chamber end wall.

7. The arrangement according to claim 1 , wherein the injector system further includes at least one air swirler fastened to the upstream end of the bowl, and a centering ring fastened to the upstream end of the air swirler and surrounding a fuel injector.

8. A turbomachine combustion chamber including an arrangement according to claim 1 .

9. A turbomachine including an arrangement according to claim 1 .

10. The arrangement according to claim 1 , wherein the inwardly-open annular groove is defined by a side wall of the pinch ring and a shoulder and a side wall of the annulus.

11. The arrangement according to claim 1 , wherein the pinch ring is fastened to the annulus by brazing or welding.