Flexible joint used at wide temperature range and flexible spray pipe

Abstract

The invention relates to the field of solid rocket engines, and discloses a flexible joint used at wide temperature range. The flexible joint comprises a front flange, a rear flange, multiple layers of elastic pieces and multiple layers of reinforcing pieces, and the front flange and the rear flange are connected through the multiple layers of elastic pieces and the multiple layers of reinforcing pieces; each elastic piece is made of an addition type liquid silicone rubber material; each reinforcing piece is made of a high-strength carbon / phenolic aldehyde composite material; the elastic pieces and the reinforcing pieces are both of a spherical annular sheet structure, and the multiple layers of reinforcing pieces and the multiple layers of elastic pieces are alternately bonded; and the shortest arc length of one reinforcing piece is larger than that of one elastic piece, and the portion, longer than one elastic piece, of one reinforcing piece is filled with dynamic sealing unvulcanized putty. According to the flexible joint used at wide temperature range and a flexible spray pipe, the stability and the safety performance of the elastic pieces and the reinforcing pieces are better, and better environmental adaptability is achieved.

Description

technical field [0001] The application relates to the technical field of solid rocket motors, in particular to a flexible joint and a flexible nozzle for wide temperature use. Background technique [0002] At present, solid rocket motors have the advantages of good safety, high reliability, good storage performance, high specific impulse density and convenient service handling. They have become the main power device in the missile field and are also widely used in the aerospace field. The flexible nozzle is one of the key components of the solid rocket motor, and it is a device for the energy conversion of the engine and the realization of thrust vector control. It is usually composed of a movable body, a fixed body, a flexible joint and an actuator. As the core component of the flexible nozzle, the flexible joint achieves the purpose of swinging the flexible nozzle through the deformation of the flexible joint. [0003] The flexible joint is composed of four parts: front f...

AI Technical Summary

Problems solved by technology

[0005] However, at present, none of the traditional metal reinforcements can meet the requirements of wide temperature environments, and it is urgent to develop composite reinforcements that meet the requirements of wide temperature environments.

Composite material reinforcements are different from the application conditions of composite flat material parts made by traditional process design methods. The stress directions of traditional composite flat materials are mainly stretching and compression along the plane direction and bending perpendicular to the plane direction. It is the tensile stress, which cannot well meet the complex and variable shear stress and bending moment requirements in the actual application conditions. Therefore, the structural stiffness and force transmission function of the flexible joint cannot be satisfied according to the traditional composite plate material design method.

[0006] Furthermore, although the current traditional silicone rubber elastic material has stable shear performance in a wide temperature range, it has excellent high and low temperature resistance (-60°C-+60°C) and resistance to radiation, ozone, solvents, etc., which is superior to many Traditional elastic materials are very suitable for the harsh working environment requirements of flexible joints, but silicone rubber is difficult to bond as an elastic material, because the polarity of the molecular chain is not strong, the reactivity is low and the chemical surface is not compatible. It is difficult to form an effective bond with reinforcement materials (metal or composite materials, especially composite materials), which reduces the reliability of flexible joints

[0007] In short, the existing reinforcements and elastic parts and the flexible joints made by bonding can no longer meet the requirements of the wide temperature environment for the rapid development of solid rocket motors. For example, in some scenarios, it is necessary for the flexible Normal application within the temperature range (such as -60°C-+60°C)

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