Arrangement with a twist-lock coupling for a turbomachine combustion chamber

1. An arrangement for a turbomachine combustion chamber, the arrangement comprising a chamber end wall pierced by at least one substantially circular opening, an injector system associated with the opening, and a deflector mounted on the downstream side of the chamber end wall in the opening by means of an annulus, said injector system comprising:

a pinch ring mounted on the upstream side of the chamber end wall and fastened against the annulus together defining an annular groove that is open towards the axis of the opening in the chamber end wall; and

an annular bowl mounted in the opening in the chamber end wall;

wherein said bowl is made up of at least two distinct parts, at least a first part forming an annular end plate suitable for sliding radially in the groove formed by the pinch ring and the annulus, and a second part forming a bowl collar that is provided with an annular collar extending parallel to the chamber end wall on its downstream side, said first and second bowl portions being fastened together by means of a twist-lock coupling.

2. An arrangement according to claim 1 , in which the end plate of the bowl presents at its downstream end an engagement ring carrying first teeth that are circumferentially spaced apart and that project radially, and the bowl collar presents an engagement ring coaxial with the engagement ring of the bowl and carrying second teeth that are circumferentially spaced apart and that project radially, the first and second teeth being spaced apart sufficiently to allow the first teeth to pass between the second teeth.

3. An arrangement according to claim 1 , further comprising anti-rotation means serving to prevent the bowl end plate from turning relative to the bowl collar.

4. An arrangement according to claim 3 , in which the anti-rotation means comprise a key passing through the chamber end wall and engaged at one end in a groove in the bowl collar and at an other end in a groove of the bowl end plate.

5. An arrangement according to claim 2 , in which the first teeth are directed radially inwards and the second teeth are directly radially outwards.

6. An arrangement according to claim 1 , in which the collar of the second part of the bowl presents a length that is substantially equal to the length of the groove formed by the pinch ring and the annulus.

7. An arrangement according to claim 1 , in which the bowl collar is pierced by a plurality of ventilation holes opening out upstream and leading to points facing the collar.

8. An arrangement according to claim 7 , in which the bowl collar presents a shoulder projecting radially outwards for preventing the ventilation holes becoming obstructed in the event of the injector system becoming highly off-center relative to the chamber end wall.

9. An arrangement according to claim 1 , in which the bowl collar is made up of two distinct parts that are fastened to each other by means of welding or brazing.

10. An arrangement according to claim 1 , in which the injector system further includes at least one air swirler fastened to the upstream end of the bowl collar, and a centering ring fastened to the upstream end of the air swirler and surrounding a fuel injector.

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

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