High-temperature brazing anti-deformation rotary shaft for body part of thrust chamber of liquid propellant rocket engine

Abstract

The invention provides a high-temperature brazing anti-deformation rotary shaft for a body part of a thrust chamber of a liquid propellant rocket engine. The high-temperature brazing anti-deformation rotary shaft comprises a water-cooling shaft, a graphite-metal friction pair and a supporting ring, wherein the water-cooling shaft comprises an inner shaft, a heat insulating layer and an extension sleeve which are sequentially nested from inside to outside; the inner shaft is a hollow cylinder and is used for circulating cooling water; the heat insulating layer covers the inner shaft, and the extension shaft can axially extend and retract freely in the axial direction when the temperature changes; the graphite-metal friction pair comprises a metal ring and a graphite ring; the graphite ring is coaxially connected in the metal ring; the inner side of the graphite ring is connected with one end of the inner shaft in a clearance fit mode; the outer side of the metal ring is fixedly connected with the small end of the body part of the thrust chamber; the large end of the body part of the thrust chamber is rigidly connected with the other end of the inner shaft through the supporting ring; one end of the extension sleeve is spliced into a mandrel of the supporting ring; and the other end of the extension sleeve is fixedly connected with the metal ring of the graphite-metal friction pair. The high-temperature brazing anti-deformation device can improve a stress condition of a product brazed by the high-temperature brazing rotary shaft for the body part of the thrust chamber of the engine, is simple in structure and is convenient to mount; and the welded product is reliable in performance and is high in universality.

Description

technical field [0001] The invention relates to a high-temperature brazing anti-deformation rotating shaft, which can be used for high-temperature brazing of conical complex interlayer structural parts in the fields of aviation and aerospace. Background technique [0002] The body of the thrust chamber of the liquid rocket engine mainly adopts brazed corrugated plate structure. The front section of the combustion chamber and the nozzle is a corrugated plate sandwich structure, which is brazed in the overall furnace. This brazing structure has the characteristics of simple process, but because the structure of the brazing body is relatively complex, the size of each section varies greatly, which is mainly manifested in the problem of local deformation of the product after brazing. In the prior art, there is a steel-steel friction pair between the large end support ring of the high-temperature brazed rotating shaft of the thrust chamber body of the engine and the water-cooled...

AI Technical Summary

Problems solved by technology

This kind of brazing structure has the characteristics of simple process, but because the structure of the brazing body is relatively complicated, the size of each section changes greatly, which is mainly manifested in the problem of local deformation of the product after brazing

In the prior art, there is a steel-steel friction pair between the large end support ring of the high-temperature brazed rotating shaft of the thrust chamber body of the engine and the water-cooled shaft. During the welding process of the product, the friction force is relatively large, which leads to poor axial expansion and contraction of the product. Axial pressure is applied during the welding process, and the recovery state after normal temperature cannot meet the requirements of use

In addition, the high-temperature brazed rotating shaft of the thrust chamber body of the engine is fixedly connected with the small end of the thrust chamber body, and the thrust chamber body expands and slides from the small end to the large end in a heated state, and the expansion resistance increases a lot when the larger end is fixed, so the thrust chamber body The use of high-temperature brazing shafts in the body makes the welding qualification rate of the engine thrust chamber body relatively low

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