Patent ID: 7926281

Claim:
A device for injecting a mixture of pressurized air and fuel into a combustion chamber of a turbomachine, the injection device having a symmetry of revolution about an axis and comprising, arranged from upstream to downstream in the gas flow direction: a sliding bushing; an injector positioned in the center of the sliding bushing; an annular cup which maintains the sliding bushing axially; an internal radial swirler provided with vanes which directs the pressurized air toward the inside of the injection device; a venturi; and a bowl which is connected to a downstream end of the internal radial swirler, wherein the sliding bushing includes, arranged from upstream to downstream, a convergent conical portion continuing into a cylindrical portion connected to an annular flange extending radially outward, the bowl includes an external cylindrical wall having an upstream end and a downstream end, the downstream end of the external cylindrical wall includes a divergent section provided, downstream, with a collar having a ring extending radially outward, the divergent section of the bowl is connected, immediately upstream of the collar, by a connecting wall to a cylindrical ring, the cylindrical ring and the connecting wall present a connection rim oriented in the upstream direction, wherein at least one row of vortex holes is formed in the external cylindrical wall of the bowl close to the upstream end of the external cylindrical wall, wherein the connecting wall of the connection rim of the bowl is provided with a row of cooling orifices inclined axially at an angle γ to the axis of the injection device, the angle γ is between 0 and 60 degrees, and wherein the vortex holes are inclined axially at an angle α2 to the axis of the injection device, the angle α2 is between 30 and 90 degrees.