Patent ID: 7040098

Claim:
A jet engine comprising, from upstream to downstream (the upstream and downstream directions being defined by the direction of circulation of the primary flow), a high-pressure compressor, a diffuser grating and a combustion chamber, said high-pressure compressor comprising an external shell which radially delimits a duct for said primary flow and is connected to an annular structure extending radially outward, said diffuser grating comprising in the axial continuation of said external compressor shell an external casing connected to a rearwardly oriented conical strut delimiting, upstream, an end of said combustion chamber, said strut itself being connected to an external casing shell which extends in the upstream direction and is fastened to said annular structure by fastening means, said strut, said external casing shell and said annular structure defining a cavity around said diffuser grating, air bleed orifices being made in said strut in order to bring the end of the combustion chamber into communication with said cavity, said external casing shell being equipped with air bleed vents, and sealing means being provided between said annular structure and said external diffuser grating casing in order to isolate said cavity from the duct for the primary flow, wherein the sealing means comprise a first seal and a second seal of the sectorized type made up of counterseal-lined strips which are acted on by springs, said first seal being fitted in a first groove provided around an upstream part of the external casing of the diffuser grating, the strips of this first seal bearing, under the action of first springs, on a downstream end of a first projection integral with the annular structure, and said second seal being fitted in a second groove provided under said annular structure, the strips of this second seal bearing, under the action of second springs on an upstream end of a second projection integral with said annular structure and on an upstream end of a third projection integral with said upstream part of the external casing.