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

Abstract

The invention relates to a method to manufacture fixed length thermal pipe under vacuum state that at least include following steps: preparing material; preparing thermal pipe semi-finished product having two ends sealed and the size is preset; pressing together and cutting process; sealing process that using a spot welding device to sealing the broken section in vacuum environment. The invention also provides a device to make fixed length thermal pipe under vacuum state. Thus, while the thermal pipe is cut in vacuum space, vacuum degree would not be damaged, and the percentage of certified products would be sharply improved.

Description

Technical field [0001] The invention relates to a fixed-length processing method of a heat pipe semi-finished product, in particular to a method for pressing, cutting and sealing a heat pipe semi-finished product of a predetermined size in a vacuum environment according to the required length. Background technique [0002] The traditional manufacturing method of heat pipes is mass-produced according to customer needs. The length of each batch in the process is different, and it is almost impossible to produce in advance with inventory. The process is cumbersome and time-consuming, and it is not easy to control and manage the automated process, which not only affects Production efficiency and also extend delivery time. [0003] In order to solve the above problems, as shown in Figure 1, the applicant proposed a "manufacturing method for heat pipes" in Taiwan, China No. 1250913 (corresponding to China No. 200510059728.2), which is mainly based on a stock amount in advance. The heat...

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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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