An unlined composite tank structure

Abstract

The utility model relates to a non-lined composite material storage tank structure, which belongs to the technical field of spacecraft. The present invention includes a box body, an ellipsoidal top cover, a spherical top cover, a butt end frame and a box bottom cover; The openings of the ellipsoidal top cover and the spherical top cover, after the ellipsoidal top cover and the spherical top cover are respectively matched and connected with the openings on the front bottom and the rear bottom, the bottom opening of the box is installed on the ellipsoidal top cover and the spherical top cover above, so that the inside of the front bottom, the inner cylinder section and the rear bottom forms a closed cavity for storing the medium; the tank section is composed of the inner cylinder section, the cylinder section and the outer cylinder section; the butt end frame It is connected with both ends of the barrel section and the outer barrel section for docking with other structures. The invention provides a nearly integrally formed composite material storage tank structure, which realizes the nearly integral forming of the box body, and other components are greatly simplified and integrated compared with traditional metal storage tanks.

Description

technical field [0001] The invention relates to a non-lined composite material storage tank structure, which belongs to the technical field of aerospace vehicles. Background technique [0002] The propellant tank is a key component of the power system and structural system of the launch vehicle. On the one hand, it needs to bear the structural load of the rocket, and on the other hand, it needs to store the propellant medium for the engine to use. The lightweight structure of the propellant storage tank is an effective way to reduce the weight of the structure itself and improve the rocket's carrying capacity. Composite materials have excellent characteristics such as high specific strength and high specific modulus. Replacing traditional aluminum alloys can reduce the weight of the structure by about 30%. , is one of the important directions for the development of propellant tanks in the future. [0003] The existing domestic propellant storage tanks are all metal storage ...

AI Technical Summary

Problems solved by technology

[0003] The existing domestic propellant storage tanks are all metal storage tanks, which use metal materials such as stainless steel and aluminum alloy, and use welding technology to realize the assembly of various components of the box body. The potential for weight reduction is getting smaller and smaller, while the specific strength and specific stiffness of advanced composite materials have been qualitatively improved compared with metal materials, which can achieve a large weight reduction of the tank structure. There are huge differences in technology and technology. Traditional design and manufacturing methods cannot meet the needs of composite storage tanks, mainly in the following areas:

[0004] (1) The traditional metal storage tank is assembled by welding process. Due to the limitation of raw material specifications and forming equipment, the storage tank is usually divided into sub-assemblies such as the bottom of the tank, the barrel section, and the short shell. Each sub-assembly is divided into multiple parts, which cannot be realized. Integral forming of storage tanks;

[0005] (2) Traditional metal storage tanks have many manufacturing processes from parts to components to the whole container, require a lot of tooling and equipment, and have a long manufacturing cycle;

[0006] (3) The materials of traditional metal storage tanks are all isotropic. Under the load conditions such as internal pressure and axial pressure, the storage tank structure has different bearing requirements in different directions, resulting in a large margin for the structure in certain directions. Structural efficiency is low

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