Half-and-half threaded connection structure of diffusing section of jet pipe of solid rocket engine

Abstract

The solid rocket motor nozzle diffuser pair half-thread connection structure of the present invention includes: a diffuser body and a half-thread connection pair; the half-thread connection pair is composed of a pair of half-thread connectors; the pair of half-thread connectors It is cut in half from a complete structural member with external threads and one end closed; the half-threaded connection pair is located outside the body of the diffusion section to play a connecting role. The half-thread connection structure of the nozzle diffuser of the solid rocket motor meets the basic requirements of the overall total weight within the given mass and volume range, ensures the engine's working reliability and structural safety, and solves the problem of axial rigid connection of the diffuser section. The thermal load bearing capacity of the diffusion section is improved, and the axial tension of the diffusion section is increased. The semi-thread connection structure of the nozzle diffusion section of the solid rocket motor can meet the axial force requirements of the solid rocket motor when it is working, and has high reliability.

Description

technical field [0001] The invention relates to the field of solid rocket motors, in particular to a connection structure for a nozzle diffuser section of a solid rocket motor. Background technique [0002] The diffusion section is an important part of the solid rocket motor and a key component that converts chemical energy into kinetic energy. In addition to being scoured by the high-temperature gas generated by the solid rocket motor, it is also subjected to the pressure of the gas. In addition to the requirements, it is also necessary to meet the structural strength requirements for bearing axial loads, and its connection performance has a direct impact on the reliability and safety of solid rocket motors. [0003] At present, the diffusion section used for solid rocket motors is connected by a combination of glue bonding and screw fixing, which has the following shortcomings: [0004] 1. The heavy weight of the metal skirt reduces the mass ratio of the solid rocket mo...

AI Technical Summary

Problems solved by technology

Glue bonding adopts the taper surface fit method, which is prone to excessive local gaps. During the bonding process, the glue flow causes local debonding, which reduces the actual bearing performance of the diffusion section. In order to reduce the impact of large fluctuations in bearing performance, it is often necessary to increase the Large bonding area, resulting in an increased length of the metal skirt, resulting in a large overall weight of the engine, reducing the mass ratio of the solid rocket motor

[0005] 2. The large volume of the diffusion section reduces the ratio of the usable space of the solid rocket motor to the mass of the motor

The bonding strength of the glue in the diffusion section is sensitive to thermal load, and the strength drops rapidly after reaching a certain temperature. In order to meet the heat insulation requirements, the thickness of the diffusion section needs to be increased. The increased insulation layer takes up a large space, and also increases the weight of the diffusion section, reducing the Usable space-to-motor-mass ratio of solid rocket motors

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