End sealing structure for heat pipe
An end sealing structure for heat pipe includes a sealed conical end formed at an end of the heat pipe, which is formed from a hollow metal pipe having a dead end opposite to the sealed conical end. The conical end is sealed at an outmost end thereof by more than one layer of weld bond, and coated with more than one layer of tin solder to enclose the weld bonds and the conical end, enabling the sealed conical end to keep an absolutely sealed state even the heat pipe is compressed in fabricating or under high internal pressure in a heated state. The heat pipe with the sealed conical end can therefore provide good heat-transport capability in a computer or any other apparatus that generates heat during operation thereof.
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The present invention relates to an end sealing structure for heat pipe, and more particularly to an end sealing structure for heat pipe that effectively protects the heat pipe from the risk of leaking and therefore enables the heat pipe to provide good heat-radiating function.
BACKGROUND OF THE INVENTIONWhen a computer is operating, the high-power chip therein is often subjected to a heat accumulation effect and fails to operate normally. To protect the high-power chip against damage due to overheating, various types of radiating elements, such as cooling fans, radiating fins, heat pipes, etc., are developed for mounting in the computer to carry away heat produced by the high-power chip during operation thereof. The heat pipe has been proven to have a good heat delivering effect, and is gradually accepted by the computer industry. The high heat transport capability of the heat pipe has also been utilized in the automobile industry, the heat-interference prevention application in national defense, the recycling of residual heat in the energy and environment engineering, etc.
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The sealed U-shaped end 22 of the pipe 20 is then welded to form a weld bond 24 at an outmost end 23 of the U-shaped end 22 to complete a heat pipe.
Before the completed heat pipe can be used, it is normally subjected to a burst test for testing its sealing effectiveness. In the burst test, the completed heat pipe is positioned in a heating oven and heated, so that the heat conducting liquid in the sealed heat pipe is heated and finally vaporized. In the event the welded outmost end 23 may fail to bear the internal pressure of the heated heat pipe, the vapor of the heat conducting liquid would leak from the welded outmost end 23, proving the heat pipe is not reliable for use and forms a confusion to the manufacturer and the user.
SUMMARY OF THE INVENTIONA primary object of the present invention is to provide an improved end sealing structure for heat pipe, so that the heat pipe is more reliable for use without the risk of leaking and having poor transport capability.
To achieve the above and other objects, the end sealing structure for heat pipe according to the present invention includes a sealed conical end formed at an end of the heat pipe, which is formed from a hollow metal pipe and has a dead end opposite to the sealed conical end. The conical end has an outer diameter smaller than that of the metal pipe, and is sealed at an outmost end thereof by more than one layer of weld bond, and coated with more than one layer of tin solder to enclose the weld bonds and the conical end.
When the heat pipe with the sealed conical end is subjected to burst test or is in practical use, it is found the conical end is absolutely sealed by the two or more layers of weld bonds and tin solder without any leaking. Therefore, the heat pipe installed in a computer or used in any other suitable application field is able to stably and effectively provide a heat-delivery function without the risk of leaking at the sealed end.
BRIEF DESCRIPTION OF THE DRAWINGSThe structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
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When the heat pipe with the conical end 15 welded twice or more times and coated with more than one layer of tin solder 17 is subjected to burst test or is in practical use, it is found the conical end 15 is absolutely sealed by the two or more layers of weld bonds 14, 16 and tin solder 17 without leaking, even when the heat pipe has a relatively high internal pressure or collides with something in the course of installation thereof. Therefore, the heat pipe installed in a computer, a car, or an interference prevention instrument is able to stably and effectively provide a heat-delivery function without the risk of leaking at the sealed conical end 15.
Claims
1. An end sealing structure for heat pipe, said heat pipe being formed from a hollow metal pipe having a first end that is a dead end and a second end opposite to said first end, said end sealing structure comprising a sealed conical end formed at said second end of said metal pipe, said sealed conical end having an outer diameter smaller than that of said metal pipe and having more than one layer of weld bonds at an outmost end thereof.
2. The end sealing structure for heat pipe as claimed in claim 1, wherein said sealed conical end has two layers of weld bonds at the outmost end thereof.
3. The end sealing structure for heat pipe as claimed in claim 1, wherein said sealed conical end has more than two layers of weld bonds at the outmost end thereof.
4. The end sealing structure for heat pipe as claimed in claim 2, wherein said sealed conical end is coated with one layer of tin solder to enclose said weld bonds and said conical end.
5. The end sealing structure for heat pipe as claimed in claim 3, wherein said sealed conical end is coated with one layer of tin solder to enclose said weld bonds and said conical end.
6. The end sealing structure for heat pipe as claimed in claim 2, wherein said sealed conical end is coated with more than one layer of tin solder to enclose said weld bonds and said conical end.
7. The end sealing structure for heat pipe as claimed in claim 3, wherein said sealed conical end is coated with more than one layer of tin solder to enclose said weld bonds and said conical end.
Type: Application
Filed: Jun 2, 2005
Publication Date: May 11, 2006
Applicant: YEH-CHIANG TECHNOLOGY CORP. (Yangmei Town)
Inventor: K.C. Lee (Taipei)
Application Number: 11/142,416
International Classification: F28D 15/02 (20060101);