FLAT-PLATE TYPE CAPILLARY STRUCTURE AND PLATE HEAT PIPE HAVING THE SAME
A plate heat pipe includes a hollow housing formed in a plate shape and a flat-plate type capillary structure. The flat-plate type capillary structure includes a capillary boundary part and a plurality of primary capillary transportation parts; wherein the capillary boundary part is surroundingly arranged at the periphery of a vaporization portion of the plate heat pipe, and a hollow vapor flowing zone is defined between the capillary boundary part and the vaporization portion. Each of the primary capillary transportation parts is disposed in the vapor flowing zone and extended from the capillary boundary part to the vaporization portion so as to be respectively gathered on the vaporization portion.
1. Field of the Invention
The present invention relates to a thinned plate heat pipe, especially to a flat-plate type capillary structure and a plate heat pipe having the capillary structure.
2. Description of Related Art
The main trend for developing electronic product is to be thinner, smaller and lighter, so a heat pipe installed therein and used for dissipating or transferring heat is also required to be thinner. For example, an ultra-thin plate heat pipe has a thickness smaller than 1.5 mm.
However, the thickness of the ultra-thin plate heat pipe is thinned, the thickness of a capillary structure installed therein has to be thinner and narrower or there may not be enough space inside the heat pipe for forming gas channels, and because of the capillary structure being thinned, the returning amount of working fluid is also reduced, so it is hard to have enough space inside the plate heat pipe for the installation of any supporting structure. As such, in the ultra-thin plate heat pipe, the capillary structure is also served as a supporting structure.
According to the above-mentioned disadvantages, the distribution of the capillary structure inside the plate heat pipe is unable to be comprehensively designed, and a vapor channel zone and the capillary structure disposed in the plate heat pipe cannot individually provide its best performance. For example, the capillary structure is unable to be provided with a sufficient vaporization surface area, a sufficient condensing surface area and a sufficient liquid transporting cross area, and the interior of the plate heat pipe is unable to provide a sufficient space for the vapor channel zone, and an internal supporting structure having a better structural strength is unable to be provided, so a recessing problem is very likely to happen to the plate heat pipe and an issue of having larger contact thermal resistance is caused, thus the heat transferring efficiency cannot be further enhanced or performed.
In view of the above, the applicant of the present invention has devoted himself for improving the mentioned disadvantages, thus the present invention having a novel design and capable of effectively improving the above-mentioned disadvantages is provided.
SUMMARY OF THE INVENTIONThe present invention is to provide a flat-plate type capillary structure and a plate heat pipe having the capillary structure. The flat-plate type capillary structure is able to be effectively distributed in a vapor flowing zone of the plate heat pipe, a liquid-state working fluid is enabled to be returned to a vaporization portion in a most effective manner, and the vapor flowing zone is provided with a sufficient pace for allowing the vaporized working fluid to be transported towards an edge for condensing, so the capillary structure is provided with a better heat transferring efficiency under the situation of the plate heat pipe being thinned.
Accordingly, the present invention provides a flat-plate type capillary structure including: a capillary boundary part and a plurality of primary capillary transportation parts; wherein the capillary boundary part is surroundingly arranged at the periphery of a vaporization portion of the plate heat pipe, and a hollow vapor flowing zone is defined between the capillary boundary part and the vaporization portion. Each of the primary capillary transportation parts is disposed in the vapor flowing zone and extended from the capillary boundary part to the vaporization portion so as to be respectively gathered on the vaporization portion.
Accordingly, the present invention provides a plate heat pipe including a hollow housing formed in a plate shape and the above-mentioned flat-plate type capillary structure disposed in the housing to support a top and a bottom inner walls of the housing.
Preferred embodiments of the present invention will be described with reference to the drawings.
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For increasing the return transporting amount of the working fluid being collected towards the capillary vaporization part 10, between the primary capillary transportation parts 12 there can be further formed with a plurality of secondary capillary transportation parts 13 having different lengths and a plurality of auxiliary capillary transportation parts 130, which are all extended from the capillary boundary part 11 towards the capillary vaporization part 10 but not connect to the capillary vaporization part 10, thereby being distributed in the vapor flowing zone 100. The thickness of the secondary capillary transportation part 13 and the thickness of the auxiliary capillary transportation part 130 can be equal to or smaller than that of each of the primary capillary transportation parts 12, and the length of the secondary capillary transportation part 13 is longer than that of the auxiliary capillary transportation part 130.
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Moreover, beside being completely formed on the inner wall of the housing 2, the grooves 23 can also be formed at a partial portion of the inner wall of the housing 2, and the grooves 23 can utilize the vaporization portion as the center for being expanded in a concentric or helical direction (e.g. right helical, left helical or both of left and right helical) to the capillary boundary part 11 so as to be formed on the inner wall of the housing 2, the grooves 23 can also be formed in an irregular shape.
Although the present invention has been described with reference to the foregoing preferred embodiment, it will be understood that the invention is not limited to the details thereof.
Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
Claims
1. A flat-plate type capillary structure, including:
- a capillary boundary part, surroundingly arranged at the periphery of a vaporization portion of a plate heat pipe, wherein a hollow vapor flowing zone is defined between the capillary boundary part and the vaporization portion; and
- a plurality of primary capillary transportation parts, disposed in the vapor flowing zone and extended from the capillary boundary part to the vaporization portion so as to be respectively gathered on the vaporization portion.
2. The flat-plate type capillary structure according to claim 1, further including a capillary vaporization part disposed on the vaporization portion, wherein the primary capillary transportation parts are respectively connected to the capillary vaporization part.
3. The flat-plate type capillary structure according to claim 2, wherein the capillary vaporization part is made of a woven net, sintering powders or sintering fibers, and disposed at a front end of each of the primary capillary transportation parts.
4. The flat-plate type capillary structure according to claim 2, wherein the capillary vaporization part is formed with a plurality of heat transferring holes.
5. The flat-plate type capillary structure according to claim 2, wherein the thickness of each of the primary capillary transportation parts is greater than that of the capillary vaporization part, and the thickness of each of the primary capillary transportation parts is equal to that of the capillary boundary part.
6. The flat-plate type capillary structure according to claim 1, wherein a plurality of gas channels are formed on the capillary boundary part and arranged at intervals, and each of the gas channels is formed as being communicated from the outer edge to the inner edge of the capillary boundary part so as to be communicated with the vapor flowing zone.
7. The flat-plate type capillary structure according to claim 2, wherein a plurality of secondary capillary transportation parts are formed between the primary capillary transportation parts, and the secondary capillary transportation parts are extended from the capillary boundary part towards the capillary vaporization part but not connected to the capillary vaporization part.
8. The flat-plate type capillary structure according to claim 7, wherein a plurality of auxiliary capillary transportation parts are formed between the primary capillary transportation parts, the auxiliary capillary transportation parts are extended from the capillary boundary part towards the capillary vaporization part but not connected to the capillary vaporization part, and the length of the secondary capillary transportation part is longer than that of the auxiliary capillary transportation part.
9. The flat-plate type capillary structure according to claim 8, wherein the thickness of the secondary capillary transportation part and the thickness of the auxiliary capillary transportation part are equal to or smaller than that of the primary capillary transportation parts.
10. The flat-plate type capillary structure according to claim 9, wherein a connection rib is provided between two adjacent primary capillary transportation parts, two adjacent secondary capillary transportation parts or two adjacent auxiliary capillary transportation parts for the purpose of lateral connection.
11. The flat-plate type capillary structure according to claim 2, wherein each of the primary capillary transportation parts is laterally extended with a capillary transportation surface having a thinner thickness.
12. The flat-plate type capillary structure according to claim 2, wherein the vapor flowing zone is installed with a plurality of flat supporting structures.
13. A plate heat pipe, including:
- a hollow housing, formed in a plate shape; and
- a flat-plate type capillary, disposed in the housing to support a top and a bottom inner walls of the housing,
- wherein flat-plate type capillary includes:
- a capillary boundary part, surroundingly arranged at the periphery of a vaporization portion of a plate heat pipe, wherein a hollow vapor flowing zone is defined between the capillary boundary part and the vaporization portion; and
- a plurality of primary capillary transportation parts, disposed in the vapor flowing zone and extended from the capillary boundary part to the vaporization portion so as to be respectively gathered on the vaporization portion.
14. The plate heat pipe having the flat-plate type capillary structure according to claim 13, wherein the housing includes a base and a top cover engaged to the base to form a plate shape.
15. The plate heat pipe having the flat-plate type capillary structure according to claim 13, wherein a distance is formed between the outer edge of the capillary boundary part of the capillary structure and a lateral inner wall of the housing.
16. The plate heat pipe having the flat-plate type capillary structure according to claim 13, wherein the inner wall of the housing is formed with a plurality of grooves surrounding the capillary structure and partially connected to the capillary structure, and the depth of the groove is smaller than 30% of the wall thickness of the housing.
17. The plate heat pipe having the flat-plate type capillary structure according to claim 16, wherein the depth of the groove is smaller than 0.03 mm.
Type: Application
Filed: Dec 6, 2013
Publication Date: May 14, 2015
Inventor: Hao PAI (New Taipei City)
Application Number: 14/099,695
International Classification: F28D 15/04 (20060101);