Plug structure for double-layer casing

Abstract

The invention relates to the field of aircraft casing structures and particularly relates to a plug structure for a double-layer casing. The plug structure comprises a plug cover (3) and a plug assembly (11). An inner plug (5) fits to an inner casing (10) through a small gap, an outer plug (9) fits to an outer casing (1) and the plugs and the casings are subjected to tight gas sealing. The inner plug (5) and the outer plug (9) in an assembled state are supported by a spring elastic force and respectively fit to the inner casing (10) and the outer casing (1). The plug structure for the double-layer casing improves the operability of a field worker and has an effective error-proof design in the operation process. The plug structure of the double-layer casing utilizes the inner and outer plugs to realize plugging so that the dimensional precision of the inner and outer casings is reduced. The structural form of the spring supporting the plugs adapts to the complex load conditions of the engine and improves the engine sealing effects and reliability.

Description

technical field [0001] The invention relates to the field of aviation casing structure, in particular to a plug structure for a double-layer casing. Background technique [0002] The double-layer casing structure is the main structural form of components such as aero-engines and gas turbine compressors. During regular maintenance, a borescope is often used to pass through the double-layer casing for related inspection and maintenance work. The internal and external working conditions of the double-layer casing are complicated. When sealing the casing hole, not only the airtightness, high reliability and error-proof design should be considered, but also the convenience of disassembly and installation should be considered, which is convenient for workers to maintain and operate. [0003] At present, the structure of the plugs of the double-layer casings of aero-engines and gas turbines mostly adopts screw fixing, and the form of a fuse at the end of the plugs is extremely unfa...

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Problems solved by technology

[0003] At present, the structure of the plugs of the double-layer casings of aero-engines and gas turbines mostly adopts screw fixing, and the form of a fuse at the end of the plugs is extremely unfavorable for the operation of on-site workers; part of the plugs of the double-layer casings are sealed in the form of a single rod. , the size requirements of the inner and outer double-layer casings are relatively high and the structure is complex, and it is easy to cause abnormal wear of the plug due to the complex load conditions inside and outside, which will affect the safety of the engine in severe cases

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