An integrally formed integrated nozzle and its manufacturing method

Abstract

The invention relates to an overall formed integrated spraying pipe and a manufacturing method thereof. The overall formed integrated spraying pipe comprises a throat insert, an ablation resisting layer, a heat insulation layer, a shell force bearing layer and a blocking cover fixed to the position of the throat neck position of the throat insert. The outer molded surface of the throat insert serves as an initial layer, and the ablation resisting layer, the heat insulation layer and the shell force bearing layer are sequentially and integrally formed from interior to exterior to form the integrated spraying pipe. The throat insert can be a rotation body of an overall structure and can also be a rotation body formed by combining split structures. The throat insert is a carbon / carbon composite throat insert. Compared with the prior art, a traditional complex part assembling technology of the spraying pipe is avoided, inner gaps of the spraying pipe are reduced, the contour of the outer wall of the throat insert is changed into two sections of folded lines compared with the traditional configuration that the contour of the outer wall of the throat insert is one section of folded line, the heat stress level of the throat insert is greatly reduced, resultant force exerted on the upstream surface and the downstream surface of the throat insert are offset by each other by means of the upstream and downstream folded line angle, acting force of the throat insert on the surface of the inner ablation resisting layer is reduced, and the use reliability of the spraying pipe is improved.

Description

technical field [0001] The invention belongs to the field of solid rocket motors, in particular to an integrally formed integrated nozzle and a manufacturing method thereof. Background technique [0002] The nozzle is a key component of a solid rocket motor. The nozzle generally includes a throat liner, an ablation-resistant layer, a heat-insulating layer, a shell load-bearing layer and a plug fixed at the neck of the throat liner, and a traditional nozzle has an ablation-resistant layer, a heat-insulation layer, and a shell load-bearing layer. Each layer is assembled from many parts into parts, and then the parts are assembled to form the nozzle, specifically, the throat liner (carbon / carbon composite material), the backing (ie, ablation-resistant layer, high silicon oxygen / phenolic molded parts), Insulation layer of convergent section (i.e. heat insulation layer, carbon phenolic / high silicon oxygen phenolic molded parts), diffusion section insulation layer (i.e. heat insu...

AI Technical Summary

Problems solved by technology

The nozzle generally includes a throat liner, an ablation-resistant layer, a heat-insulating layer, a shell load-bearing layer and a plug fixed at the neck of the throat liner, and a traditional nozzle has an ablation-resistant layer, a heat-insulation layer, and a shell load-bearing layer. Each layer is assembled from many parts into parts, and then the parts are assembled to form the nozzle, specifically, the throat liner (carbon / carbon composite material), the backing (ie, ablation-resistant layer, high silicon oxygen / phenolic molded parts), Insulation layer of convergent section (i.e. heat insulation layer, carbon phenolic / high silicon oxygen phenolic molded parts), diffusion section insulation layer (i.e. heat insulation layer, carbon cloth phenolic / high silicon oxygen cloth phenolic winding parts), nozzle casing (i.e. The load-bearing layer of the shell, 30CrMnSiA metal parts) is assembled and formed, there are many parts, the molding time is long, and there are internal gaps between the parts of the nozzle, which leads to problems in structural reliability

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