Method and equipment for fabricating fixed length heat pipe under vacuum state

Abstract

The invention relates to a method for manufacturing a fixed-length heat pipe in a vacuum state, which at least includes: a material preparation step: preparing a heat pipe semi-finished product with predetermined dimensions sealed at both ends; a pressing and cutting step: placing the heat pipe semi-finished product on the In a vacuum environment, pressing and cutting at a fixed point by a pressing and cutting device; and a sealing step: using a spot welding device in the vacuum environment to spot weld and seal the heat pipe cutting position. The present invention also provides a device for manufacturing fixed-length heat pipes in a vacuum state. The semi-finished heat pipes with predetermined dimensions can be pressed, cut and sealed in a vacuum environment according to the required length. In this way, when the heat pipe is cut to a certain length, the degree of vacuum will not be lost, and the amount of working fluid stored in the pipe can be strictly and effectively controlled, and the authenticity rate of the product can be greatly improved.

Description

technical field [0001] The invention relates to a fixed-length processing method of heat pipe semi-finished products, in particular to a method of pressing, cutting and sealing heat pipe semi-finished products of predetermined size in a vacuum environment according to the required length. Background technique [0002] The traditional manufacturing method of heat pipes is mass-manufacturing according to customer needs. The length of each batch in the process is different, and it is almost impossible to produce with stock in advance. Not only is the process cumbersome and time-consuming, it is not easy to control and manage the automated process, which not only affects Production efficiency but also extended lead time. [0003] In order to solve the above problems, such as figure 1 Shown is a "method for manufacturing heat pipes" proposed by the applicant in China Taiwan No. 1250913 (corresponding to China No. 200510059728.2), which mainly makes heat pipes with an extended le...

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Problems solved by technology

[0014] Although the above-mentioned heating method can achieve the positive pressure in the tube and avoid vacuum failure during fixed-length processing, those skilled in the art know that the control of the heating temperature is not easy to accurately control because of the differences in the characteristics of each heat pipe. This is one of its disadvantages

In addition, when heated to about 100°C and the heat pipe is filled with saturated steam, when the broken tube is pressed and cut off, the steam of the working fluid will be released to some extent. The amount of the steam released is not only related to the process of the broken tube In addition, it is also related to the temperature of the heat pipe at that time, that is, the higher the temperature of the heat pipe and the greater the saturated vapor pressure, the greater the amount of steam released. For example: the saturated vapor pressure of water at 100°C is 1.0kg / cm 2 , 110°C saturated vapor pressure is 1.46kg / cm 2 , the difference between the two is only 10°C, and the difference in saturated vapor pressure is 46%. Therefore, even if the amount of working fluid in each heat pipe of the same batch is inconsistent and uncertain, it is also the biggest factor affecting the authenticity of the heat pipe.

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