Pipeline structure penetrating through three-layer casing

Abstract

The invention provides a pipeline structure penetrating through a three-layer casing, which comprises a pipeline; an inner-layer casing; a middle-layer casing which is arranged on the radial outer side of the inner-layer casing in a sleeved manner; an outer-layer casing which is arranged on the radial outer side of the middle-layer casing in a sleeved manner; the pipeline structure penetrating through the three-layer casing further comprises a middle-layer floating sleeve, the middle-layer floating sleeve is connected to the middle-layer casing, and the pipeline penetrates through the middle-layer floating sleeve; an outer-layer floating sleeve which is connected to the outer-layer casing, wherein the outer-layer floating sleeve is sleeved with the middle-layer floating sleeve, and the middle-layer floating sleeve and the outer-layer floating sleeve can move relatively in the axial direction of the pipeline; the pipeline comprises a first pipeline body and a second pipeline body; one end of the first pipeline body is connected to the inner-layer casing; the other end of the first pipeline body is arranged on the second pipeline body in a sleeved mode; the second pipeline body is connected to the outer-layer floating sleeve; and the first pipeline body and the second pipeline body can relatively move in the axial direction of the pipeline.

Description

technical field [0001] The application belongs to the field of aero-engines, in particular to a pipeline structure passing through a three-layer casing. Background technique [0002] Compared with traditional fixed-cycle aero-engines, variable-cycle aero-engines have many advantages. With the continuous improvement of aero-engine design, engine cycles and structures have been continuously proposed and evolved, and variable-cycle propulsion aero-engines have gradually been used to power main combat aircraft. [0003] Compared with the variable cycle engine, the adaptive variable cycle engine adds an external bypass on the basis of the double external bypass variable cycle engine. The added external bypass can further increase the variation range of the engine bypass ratio and optimize the comprehensive performance of the engine within the envelope. performance, reduces overflow resistance, and also solves the problem of inlet boundary layer separation. The airflow in the out...

AI Technical Summary

Problems solved by technology

[0004] Compared with the conventional turbofan engine, the increased external duct of the adaptive variable cycle engine leads to an increase in the number of layers of the pipeline passing through the casing, which brings many adaptability problems of assembly and sealing. Not only the three-layer casing needs to be considered The coordination of deformation should also consider the reliability of pipeline work. The purpose of this invention is to solve this problem. On the basis of conventional turbofan engine pipeline design, a new pipeline structure that meets the requirements is further proposed.

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