Method for welding capillary tube heat exchanger tube sheet and capillary tubes

Abstract

The invention provides a method for welding a capillary tube heat exchanger tube sheet and capillary tubes. The method for welding the capillary tube heat exchanger tube sheet and the capillary tubescomprises the following steps that 1, a tool is machined; 2, the stainless steel capillary tubes with high temperature resistant metal wires penetrating through the insidesarearranged according to requirements of a capillary tube heat exchanger and penetrate through small holes at the bottom of the tool; 3, metal is added into the tool; 4, the metal is melted; and5, the tool is removed, the metalwires are extracted, machining and assembling are further conducted, and overall manufacturing of the capillary tube heat exchanger is completed. The method for welding the capillary tube heat exchanger tube sheet and the capillary tubes has the advantages that it is ensured that the problem that the welding of the capillary tubes and the tube sheet of the capillary tube heat exchanger is difficult can be solved while an integrated tube sheet and capillary tube channel structure is obtained by melting solidification, and a microchannel required by the capillary tube heat exchanger is formed; and the cost can be effectively reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of microchannel heat exchangers, and belongs to a novel welding method for capillary heat exchanger tube sheets and capillary tubes. Background technique [0002] With the rise of research topics such as supercritical carbon dioxide Brayton cycle power generation and carbon dioxide heat pumps, supercritical carbon dioxide heat exchangers have become one of the main directions of current research. As one of the key components in the supercritical carbon dioxide power generation system and carbon dioxide heat pump system, the heat exchanger's efficiency, compactness and tolerance limit have an important impact on the overall performance of the system. Due to their own structure and manufacturing process, traditional shell-and-tube and plate heat exchangers have disadvantages such as bulky volume, low temperature and pressure resistance, and are not suitable for supercritical carbon dioxide heat exchangers. St...

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Problems solved by technology

[0003] At present, there are several difficulties in the manufacturing of high temperature and high pressure compact microchannel heat exchangers

First of all, the plate microchannel heat exchanger based on the traditional welding method has the disadvantages of low connection strength and poor pressure resistance, and it is difficult to be directly applied to high-voltage occasions; the printed circuit board heat exchanger using the new diffusion welding method shows good performance. Thermal and strength properties, but the high cost and complicated process are the factors restricting its extensive development

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