A small long-tailpipe solid rocket engine

By employing EPDM rubber-coated propellant and carbon phenolic insulation in a small long-tail solid rocket motor, the structural design was optimized, solving the ablation problem of the long tail tube under high temperature and high pressure conditions. This achieved efficient heat insulation protection and long-term operation, and improved space utilization.

CN224432682UActive Publication Date: 2026-06-30HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
Filing Date
2025-08-18
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The long tail tube of a small solid rocket motor is prone to structural defects and thermal protection defects under high temperature and high pressure environment, resulting in severe local ablation and affecting the structural integrity and service life of the motor.

Method used

The propellant is coated with EPDM rubber and an ablation-resistant carbon phenolic insulation layer. The structure of the long tailpipe and the gap of the insulation layer are optimized. Combined with the alloy steel combustion chamber shell and the ablation-resistant nozzle, the heat insulation protection is enhanced and the filling density is increased.

Benefits of technology

It achieves efficient heat insulation protection for long-tail solid rocket motors, extends operating time, shortens projectile length, improves space utilization, and provides a gas flow channel for thrust vectoring devices.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a small, long-tailed solid rocket motor, comprising a combustion chamber shell, a combustion chamber insulation layer, a propellant charge, an adjusting pad, a long tailed tube shell, a long tailed tube insulation layer, a nozzle shell, a nozzle insulation layer, a graphite throat liner, a plug, an electrode wire plug, a blunt-sensitive igniter, a pressure testing port plug, a connector mounting plate, and a short-circuit head. The propellant charge and adjusting pad are sequentially placed within the combustion chamber. The nozzle shell and long tailed tube shell are screwed together internally and externally. The blunt-sensitive igniter, via the electrode wire plug, connector mounting plate, and short-circuit head, is mounted on the side of the handle rib of the long tailed tube shell to provide short-circuit protection. The long tailed tube shell and combustion chamber shell are then assembled into the complete motor. This invention features high space utilization and minimal change in the center of gravity, resulting in a more rational structural layout.
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