A kind of preparation method of field test precooler

Abstract

The invention discloses a preparation method of a pre-cooler for a ground test. A plurality of straight microtubes are placed in a forming mold and vacuum thermoformed into spiral microtubes; the microtubes are passed through two ends of holes opened side by side on a gasket Assemble with the gasket respectively; insert the two ends of the microtube into the mounting holes on the side of the gas collecting pipe respectively, apply paste solder on the interface, move it into the vacuum furnace for vacuum brazing to form a diaphragm; vacuum brazing is completed Finally, the lugs are set on the gas collecting pipe, and the lugs and the gas collecting pipe are welded by argon arc to form a pre-cooler; the beneficial effects of the present invention are: by accurately formulating brazing parameters, the amount of brazing material is strictly controlled, and the gas collecting pipe and pipeline are controlled. The gap at the place to be brazed is within 0.02, which realizes that the brazing of microtubes with a wall thickness of 0.05mm is not easy to dissolve.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aerospace components, and in particular relates to a preparation method of a ground test precooler. Background technique [0002] The ground test precooler belongs to a new type of power cooling part of the spacecraft, which is mainly used to cool the hot air of the engine; the existing defects of the ground test precooler are: because the pipe diameter is small, the wall thickness is thin, and the high temperature brazing Diaphragm brazing is easy to dissolve; straight pipes are not easy to assemble, and the spiral shape of the pipeline after brazing is not easy to ensure and easy to deform; gaskets are not easy to assemble and fix, and the lugs and gas collecting pipes are connected by argon arc welding. If the distance is too close, the pipeline may be damaged, resulting in the scrapping of parts; both ends of the diaphragm gas collector must be welded by argon arc welding. tubes, and it...

AI Technical Summary

Problems solved by technology

[0002] The ground test precooler belongs to a new type of power cooling part of the spacecraft, which is mainly used to cool the hot air of the engine; the existing defects of the ground test precooler are: because the pipe diameter is small, the wall thickness is thin, and the high temperature brazing Diaphragm brazing is easy to dissolve; straight pipes are not easy to assemble, and the spiral shape of the pipeline after brazing is not easy to ensure and easy to deform; gaskets are not easy to assemble and fix, and the lugs and gas collecting pipes are connected by argon arc welding. If the distance is too close, the pipeline may be damaged, resulting in the scrapping of parts; both ends of the diaphragm gas collector must be welded by argon arc welding. tubes, and it is easy to damage the micro tubes during argon arc welding.

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