A kind of preparation method of wind tunnel heater containing special-shaped air pipe

Abstract

The invention discloses a method for preparing a wind tunnel heater with a special-shaped air pipe, which includes the following operations: processing fluid nozzles, special-shaped air pipes, air pipes and a shell; sequentially assembling the liquid nozzle, special-shaped air pipes, and air pipes at the assembly position of the shell; Processing the first partition, opening a collecting tank for diverting the solder on the first partition; passing the first partition through the liquid nozzle, special-shaped air pipe, and air pipe and assembling it on the housing to obtain an assembly assembly; Place the assembled components in a vacuum brazing furnace and perform vacuum brazing to obtain a brazed component; process the second partition, assemble the second partition on the first partition and the shell, and then place the special-shaped air pipe reinforcement ring The trachea reinforcement ring and the liquid nozzle reinforcement ring are assembled on the second partition; after the assembly is completed, the cover plate groove is processed, and the cover plate is assembled into the cover plate groove to obtain a heater assembly; the heater assembly is vacuum brazed. The invention reduces welding difficulty and ensures product quality by adjusting the brazing structure.

Description

technical field [0001] The invention belongs to the technical field of aerospace precision manufacturing, and relates to a preparation method of a wind tunnel heater with a special-shaped air pipe. Background technique [0002] A schematic diagram of a wind tunnel heater with a special-shaped trachea figure 1 As shown, the heater is composed of a shell, a first partition, a second partition, an air pipe and a liquid nozzle, wherein the second partition is a high-strength and high-conductivity copper alloy, and the rest are all austenitic stainless steel. The heater has a "three-plate, two-cavity" structure, and the parts are vacuum brazed to form a fuel chamber and a water-cooling chamber. The fuel chamber and the water-cooling chamber must withstand a pressure of 4MPa alone and cannot be connected in series. Because the second partition is a high-strength and high-conductivity copper alloy, and the rest are austenitic stainless steel, the physical and chemical metallurgica...

AI Technical Summary

Problems solved by technology

Because the second partition is a high-strength and high-conductivity copper alloy, and the rest are austenitic stainless steel, the physical and chemical metallurgical properties of the two materials are quite different, and welding is more difficult; in addition, there are special-shaped air tubes on the second partition During assembly, the fit between the special-shaped air pipe, the first partition and the shell is invisible, the assembly quality is uncontrollable, and the solder is difficult to preset; the joints involved in the wind tunnel heater containing the special-shaped air pipe include the shell, the first partition It is difficult to ensure the brazing gap by direct processing at the plate, the second partition, the liquid nozzle, and the gas pipe, which affects the brazing quality and is low in efficiency

Images