Method for hermetically sealing metal heat tubes
A metal heat pipe and sealing technology, which is applied in indirect heat exchangers, lighting and heating equipment, etc., can solve the problems of difficult port sealing, poor plasticity, and difficulty in ensuring the airtightness of flat heat pipe sealing, so as to ensure air tightness effect
Active Publication Date: 2014-06-11
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
This brings difficulties to the sealing of heat pipes. Due to the poor plasticity of alloys with high hardness, if the traditional cold sealing method is used, it is difficult to seal the ports and airtightness cannot be guaranteed.
The Chinese Patent Publication No. CN1736629A "Shrinkage, Sealing Device and Processing Method in Heat Pipe Manufacturing Process" proposes a sealing device consisting of a high-speed vertical drill, a heating clamping device, etc., which improves the sealing process of traditional heat pipes, but is not applicable For sealing of flat heat pipes
Method used
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Embodiment
[0025] Such as figure 1 The structure diagram of the aluminum alloy flat metal heat pipe selected in this embodiment is shown. The cross-sectional shape of the metal heat pipe is rectangular, the heating is by electromagnetic induction heating, and the reinforcement treatment is by argon arc welding.
[0026] A method for sealing a metal heat pipe, comprising the steps of:
[0027] (1) if Figure 5 As shown, one end port of the heat pipe is heated by electromagnetic induction heating, and the heating temperature is 0.5 to 0.6 times the recrystallization temperature of the metal heat pipe material, and lasts for 3 to 10 minutes; in this embodiment, the metal heat pipe made of aluminum alloy is selected. The heating temperature is 320° C. and the duration is 8 minutes.
[0028] (2) After removing the heating device, if figure 2 As shown, use two arc-shaped pressing blocks to pressurize and seal the heated port of the heat pipe. The distance between the two arc-shaped pressin...
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The invention discloses a method for hermetically sealing metal heat tubes. The method includes the steps of (1) heating an end port at one end of the metal heat tube for 3 to 10 minutes at the temperature of 0.5-0.6 time of recrystallization temperature of the metal heat tube; (2) sealing the heated end port of the metal heat tube in a pressure manner for 1-10 minutes by two arc-shaped pressing blocks; (3) subjecting the sealed end port to reinforcing treatment after the sealed end port is cooled so as to complete hermetical sealing at one end of the metal heat tube; and (4) hermetically sealing the other end port of the metal heat tube by repeating the step (1), the step (2) and the step (3) after the metal heat tube is subjected to vacuum pumping and working medium pouring. Via heating, pressure sealing and final reinforcing treatment, air impermeability of the heat tube and strength requirements of the sealed end ports are well guaranteed.
Description
technical field [0001] The invention relates to a sealing technology, in particular to a sealing method for metal heat pipes. Background technique [0002] Metal heat pipes have the advantages of high thermal conductivity, excellent isothermal properties, and strong environmental adaptability, and are widely used in heat dissipation of electronic products and thermal control systems of space technology. Sealing, as an important process in the heat pipe manufacturing process, plays a very important role in ensuring the working performance and service life of the heat pipe. [0003] The quality of the airtight seal is determined by two main factors: good airtightness and sufficient strength. [0004] In order to ensure that the heat pipe can withstand sufficient pressure without deformation during operation, metals and alloys thereof with high hardness can be selected as materials, such as aluminum alloys, and support columns can be arranged in the inner cavity. This brings ...
Claims
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IPC IPC(8): F28D15/02
Inventor 廖火生陆龙生黄光汉汤勇刘小康
Owner SOUTH CHINA UNIV OF TECH