Machining method for shower-type injector adopting thin guide pipes

Abstract

The invention discloses a machining method for a shower-type injector adopting thin guide pipes. The machining method comprises the following steps: (1) machining components, specifically, machining an upper injection disc, a lower injection disc, a mouse cage and a plurality of the thin guide pipes, reserving gaps with a size of 0.03-0.8mm between upper connection holes of the thin guide pipes onthe upper injection disc and the thin guide pipes during brazing, and arranging chamfers at the lower ends of the upper connection holes of the thin guide pipes; and meanwhile, reserving gaps with asize of 0.05-0.10mm between lower connection holes of the thin guide pipes on the lower injection disc and the thin guide pipes during brazing; (2) cleaning; (3) assembling and filling brazing fillermetal; (4) brazing, specifically, carrying out vacuum heating to reach 850-900 DEG C, and carrying out heat insulation for 30-60 minutes; then heating to reach 1030-1050 DEG C in 5 minutes, and carrying out heat insulation for 10-15 minutes; and then cooling to reach 600-700 DEG C, carrying out heat insulation for 1.5-2.5 hours and then cooling to reach room temperature with the furnace; and (5) removing burrs. According to the machining method disclosed by the invention, the thin hole machining requirement is lowered, the machining requirement on a thin hole machine is low, the whole assemblyis simple to operate, the working efficiency is high, the thin guide pipes of the injector are high in consistency, and the product pass percent is high.

Description

technical field [0001] The invention relates to the preparation technology of a liquid rocket engine, in particular to a method for processing a showerhead injector using a thin conduit. Background technique [0002] The power system of space vehicles such as artificial satellites and spacecraft generally needs to complete tasks such as orbit change, orbit maintenance, rendezvous and docking, attitude control, and precise positioning. Low-thrust monolithic liquid rocket engines can provide power for the completion of these tasks. Single-component catalytic decomposition engines are mostly micro and small engines, often consisting of multiple thrust chambers of different thrusts and types and additional components to form an engine, which generates thrust by ejecting high-temperature and high-speed gas, and is used to provide momentum and perform attitude control for aircraft . The injector is a very important component in the thrust chamber assembly, which can realize prope...

AI Technical Summary

Problems solved by technology

However, the showerhead injector relies on thin conduits to control the flow of the propellant, and has high requirements for the accuracy of the inner diameter of the thin conduits and the geometric shape of the end faces. During brazing, brazing material is prone to overflow, causing the fine conduits to be blocked and deformed, which in turn causes the fine conduits to be damaged. Risks such as inconsistent height of protruding injection surface and insufficient weld strength

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