Assembly method of flexible nozzle

Abstract

The invention discloses an assembly method of a flexible nozzle. The flexible nozzle comprises a flexible joint, a fixed inverted cone component, a diffusion section component, a movable inverted coneheat insulating layer, a throat insert body and a covering shelter. According to the assembly method disclosed by the invention, positional accuracy of all parts of the flexible nozzle is controlledby utilizing positioning screws, coaxiality and perpendicularity of an assembly surface are improved by reserving a machining allowance in advance, the throat insert body is sealed and fixed by utilizing a sealant and adhesives, a swing inner cavity of the flexible nozzle is inspected by utilizing an endoscope before the covering shelter is assembled, and an independent assembly region is arrangedto control the swing inner cavity of the flexible nozzle not to have unnecessary substances, so that the assembly problem of the flexible nozzle is solved, and production efficiency is increased, thereby guaranteeing assembly accuracy and quality of the flexible nozzle; and moreover, checked by a ground test and a flight test for multiple times, the flexible nozzle assembled by the assembly method disclosed by the invention completely meets the design requirement in product quality.

Description

technical field [0001] The invention belongs to the technical field of engine flexible nozzles, in particular to an assembly method of a flexible nozzle. Background technique [0002] The nozzle is an important structural part of the rocket engine. It is located at the tail of the engine and is the outlet of the high-temperature and high-pressure gas in the combustion chamber. It is an important part of the energy conversion of the rocket engine and directly affects the performance of the engine. The flexible nozzle is a complex nozzle with full-axis swing function and vector control through swing. Such as figure 1 As shown, the flexible nozzle mainly includes a flexible joint 1, a fixed inverted cone assembly 2, a diffuser section assembly 3, a movable inverted cone insulation layer 4, a throat lining body 5, and a shielding cover 6 and other components. [0003] High assembly position accuracy, stable structure, good sealing and no excess in the swing inner cavity of the...

AI Technical Summary

Problems solved by technology

[0004] 1) The flexible joint 1, the fixed inverted cone component 2, and the diffuser component 3 are assembled and fixed by screws. Since there is a large gap between the screw and the through hole, there is no circumferential and radial positioning of each component during the assembly process, so the assembly The radial and circumferential position accuracy of each component cannot be guaranteed;

[0005] 2) The flexible joint 1, the fixed inverted cone assembly 2, the diffusion section assembly 3, and the movable inverted cone insulation layer 4 are assembled to form a flexible nozzle assembly, and the components that make up the flexible nozzle assembly are assembled and fixed by screw fixing or bonding , due to the accumulation of assembly errors, the coaxiality of the inner hole and the verticality of the end face of each component after assembly are poor, resulting in uneven assembly gaps between the flexible nozzle assembly and the throat liner body, making it difficult to assemble the throat liner body and the flexible nozzle assembly;

[0006] 3) The flexible joint 1, the fixed inverted cone component 2 and the diffusion section component 3 are assembled to form a swing inner cavity, and the outside is protected by a shield cover 6 to prevent excess materials from entering the swing cavity of the flexible nozzle; this method is completed after the flexible nozzle is assembled Finally, it can prevent the swing inner cavity of the flexible nozzle from entering excess matter, but it cannot prevent the swing inner cavity of the flexible nozzle from entering excess matter during the assembly process, and there are hidden dangers in the normal operation of the nozzle

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