High temperature vacuum brazing clamp for internally finned tube

Abstract

The invention relates to a high temperature vacuum brazing clamp for an internally finned tube. The clamp consists of a supporting guide tube, an inner supporting cone, a core tube, an end head supporting cone, a gasket and a nut, wherein the supporting guide tube consists of a plurality of tube segments which are formed by uniformly cutting a circular tube along the axial direction; when an external force is applied to the nut, the supporting guide tube can move along the inclined planes of the inner supporting cone and the end head supporting cone so as to uniformly stretch the tube segments of the supporting guide tube along the radial direction; and inner fins can be gradually and closely attached to the inner wall of an outer tube under the action of the uniform tension of the supporting guide tube. The clamp of the invention can apply uniform tension to the internally finned tube during the high temperature brazing process, reduce the distance for the weld joint, improve the ratio of welding area, improve the strength and the plasticity of the brazing joint and reduce the thermal contact resistance so as to meet the requirements for the use of the internally finned tube in ahigh temperature heat exchanger; and meanwhile, the clamp has a simple structure and convenient assembly and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an inner finned tube brazing fixture and its manufacturing process, in particular to a high temperature inner finned tube used in the fields of high temperature waste heat recovery such as chemical industry, metallurgy, glass manufacturing, municipal solid waste incineration and biomass incineration. A jig required for vacuum brazing. Background technique [0002] With the increasing shortage of energy, the world needs more efficient energy power systems, and efficient energy power systems often require higher operating temperatures. At the same time, the world is paying more and more attention to emission reduction and energy saving. Therefore, high-temperature heat exchangers have broad market demand in high-temperature waste heat recovery fields such as chemical industry, metallurgy, glass manufacturing, municipal solid waste incineration and biomass incineration, such as solid oxide fuel cells, external combustion combined ...

AI Technical Summary

Problems solved by technology

For the inner finned tube with very irregular welding surface, due to the limitation of the manufacturing process, the flatness of the inner surface of the stainless steel tube, the roundness of the inner fin and the flatness of the fin peak cannot be accurately guaranteed

The inventors have shown through preliminary experiments that even if a core tube with the same outer diameter as the inner diameter of the inner fin is inserted into the inner finned tube and then subjected to high-temperature vacuum brazing, a good welding effect cannot be obtained

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