Chemical metallurgical connecting method for heat pipe and radiating fins

Abstract

The invention discloses a chemical metallurgical connecting method for a heat pipe and radiating fins. The method comprises the following steps of: inserting a radiating fin with a turned edge into the heat pipe; inserting a tin ring into one side back to the turned edge along the heat pipe, making the tin ring contacted with the radiating fin, and repeating the process to sleeve a plurality of radiating fins and tin rings on the heat pipe to form a sleeved piece; and then putting the sleeved piece into a heat treatment furnace in the direction that the turned edges are downward, and melting the tin rings with heating, wherein the molten tin is infiltrated into the fit clearance between the turned edges and the heat pipe so as to realize chemical metallurgical connection of the heat pipe and the radiating fins. The insertion of the fins and the tin rings can be implemented on a streamline, the processing efficiency is high, the distance between the fins is not limited, the fit clearance between the turned edges of the fins and the heat pipe is small, the molten tin can be infiltrated under the combined action of gravity and capillary and filled into the fit clearance between the turned edges and the heat pipe to realize chemical metallurgical connection of the heat pipe and the radiating fins, and the connection thickness is low.

Description

technical field [0001] The invention belongs to the technical field of heat dissipation devices, and in particular relates to a chemical metallurgical connection method for heat pipes and heat dissipation fins. Background technique [0002] Heat dissipation is the "bottleneck" problem that restricts the industrialization of high-power LED lighting, and heat pipe fin radiators are one of the technical ways to solve the heat dissipation of high-power LEDs. In order to reduce the thermal resistance and improve the heat dissipation efficiency of the heat pipe fin radiator, a chemical metallurgical connection should be made between the fin and the heat pipe. Applying solder paste and then brazing through heat treatment is a traditional chemical metallurgical method for connecting fins and heat pipes. If you first apply solder paste on the heat pipe and then insert the fins, because the fit gap between the fins and the heat pipe is small, The solder paste is easy to be squeezed o...

AI Technical Summary

Problems solved by technology

Applying solder paste and then brazing through heat treatment is a traditional chemical metallurgical method for connecting fins and heat pipes. If you first apply solder paste on the heat pipe and then insert the fins, because the fit gap between the fins and the heat pipe is small, The solder paste is easy to be squeezed out, resulting in insufficient application amount. If the fins are inserted on the heat pipe before applying the solder paste, the solder paste will be applied unevenly and the production efficiency will be significantly reduced.

The patent of invention with the publication number CN 101141867A discloses a chemical metallurgical method in which tin tubes are first inserted into the fins and then heat pipes are inserted, and then fins and heat pipes are connected through heat treatment. This method makes the fins and heat pipes If the fit gap is too large, the position of the fins is easy to change during the heat treatment process, especially because the thermal resistance is inversely proportional to the thermal conductivity and proportional to the thickness, the thermal conductivity of tin is relatively low and the increase in the thickness of the chemical metallurgical connection leads to an insignificant decrease in thermal resistance

The utility model with the authorized announcement number CN 2569532Y discloses a relatively small solder paste injection hole above the heat pipe perforation of the fin, injects solder paste into the injection hole after passing through the heat pipe, and then connects the fin to the heat pipe through heat treatment. A chemical metallurgical method, which can chemically metallurgically connect the fins and heat pipes with flanged fins and the fin spacing is equivalent to the height of the flanged flanges, but the high-power LED heat pipe fin radiator requires the fin spacing to be greater than the flanged edge height, and this method is difficult to realize the chemical metallurgical connection between the fins with large fin spacing and the heat pipe

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