| 摘要 |
A jet engine with a sealing system for an indoor air extraction cavity part using a strip-type sealing part acting in two directions is provided to achieve complete sealing between a duct for a main flow and a cavity part regardless of pressure difference between two surfaces of sealed areas and a change of a gap. In a jet engine with a sealing system for an indoor air extraction cavity part using a strip-type sealing part acting in two directions, a high-pressure compressor, a diffuser grille(10), and a combustion chamber are arranged from upstream to downstream. The high-pressure compressor has an outer cover(6) connected to an annular structure(7) radially defining a duct for a main flow and extending to the radial outside. The diffuser grille has an outer casing(12) connected to a conical strut(13). The strut is connected to an outer cover fixed to the annular structure by a fixing unit. The strut, the outer cover of the outer casing, and the annular structure constitute a cavity part(20) around the diffuser grille. An air extraction hole(22) is formed in the strut to connect the cavity with the end of the combustion chamber, and an extraction air outlet hole(23) is installed in the outer cover of the outer casing. A sealing unit is formed between the outer casing of the diffuser grille and the annular structure to separate the duct for a main flow and the cavity part. The sealing unit has an annular partition part(50) received in a channel arranged to the outer periphery of an upstream part(12a) of the outer casing of the diffuser grille in a method wherein the radial inside is radially slid and is sealed up. The sealing unit has a first sealing part(50) and a second sealing part(60) comprising strips(30) installed parallel with a counterseal(31). The first sealing part is fixed to a first groove(32) arranged around the upstream part of the outer casing of the diffuser grille. The strip of the first sealing part is supported to the downstream end of a first protruded part(71). The second sealing part is fixed to a second groove(73) arranged under the annular structure. The strip of the second sealing part is fixed to the upstream end of a second protruded part(72) and the upstream end of a third protruded part(76).
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