Supporting structure for vapor chamber

[0001] The present invention relates to a vapor chamber, and more specifically, to a supporting structure for vapor chamber that provides an enhanced supporting effect and can be produced at largely reduced manufacturing cost.

[0002] As the computation performance of the currently available mobile devices, personal computers, severs, communication cabinets and other systems or devices has been largely upgraded, heat generated by computation units in these systems or devices is also largely increased. Therefore, heat dissipation units are required to dissipate the heat. Different heat dissipation units, such as heat sinks, heat pipes and vapor chambers, are widely used with cooling fans to enhance heat dissipation. Among others, vapor chambers are normally used with fans to enable forced heat dissipation from a large area. To avoid thermal resistance effect, the heat dissipation elements must be tightly attached to one another. Generally, the vapor chamber is a flat plate internally defining a chamber for vapor/liquid circulation to transfer the heat. Furthermore, the vapor chamber is internally provided with a plurality of supporting posts to support the chamber, lest the vapor chamber should expand or deform under heat or pressure.

[0003] The vapor chamber spreads the heat from one area to another area, and is provided with a plurality of supporting posts therein to avoid expansion or deformation under heat or pressure. However, it requires additional labor and time and increased manufacturing cost to provide the supporting posts. In the case copper cylinders externally combined with sintered rings are used as the supporting posts of the vapor chamber, the copper cylinders serve to support the chamber and the sintered rings enable back flow and circulation of the working fluid. In this case, the vapor chamber tends to have uncontrollable bottom flatness. Or, in the case copper cylinders with multiple grooves are used as the supporting posts of the vapor chamber, the copper cylinders serve to support the chamber and also enable back flow and circulation of the working fluid. In this case, the vapor chamber also tends to have uncontrollable bottom flatness. The vapor chamber can be otherwise internally etched to directly form supporting posts and vapor passages or flow channels on its inner wall surfaces. However, it requires more time to do so. Further, deeper etching requires longer time. Other processes, such as washing, drying and so on, also extend the manufacturing time.

[0004] In view that the conventional technique for solving the problem of a deformed vapor chamber also brings the problems of increased manufacturing costs and uncontrollable bottom flatness of the vapor chamber, it is desirable to work out a way to reduce the manufacturing cost.

[0005] To solve the above problems, a primary object of the present invention is to provide a supporting structure for vapor chamber that includes a first and a second plate member, a supporting member, and a working fluid. The first plate member has a first and a second side, whereas the second plate member has a third and a fourth side. The second plate member is assembled to the first plate member to define a chamber between the second side of the first plate member and the third side of the second plate member. The supporting member is located in the chamber, and has at least one base portion and a plurality of supporting portions, as well as a plurality of mutually communicable passages formed between the supporting portions. The working fluid is filled in the chamber to flow through the passages. With these arrangements, the vapor chamber supporting structure of the present invention can be formed by stamping to reduce labor and time cost while provides upgraded heat transfer efficiency, and can also overcome the problems of deformation under pressure and uncontrollable bottom flatness as found in the prior art vapor chambers.

[0014] The present invention will now be described with some preferred embodiments thereof and by referring to the accompanying drawings. For the purpose of easy to understand, elements that are the same in the preferred embodiments are denoted by the same reference numerals.

[0015] Please refer to FIGS. 1 and 3, which are exploded perspective view and fragmentary, assembled sectional view, respectively, of a supporting structure for vapor chamber according to a first preferred embodiment of the present invention, and to FIG. 2, which is a perspective view of a supporting member 4 included in the first preferred embodiment of the present invention. For the purpose of conciseness, the present invention is also briefly referred to as the vapor chamber supporting structure and generally denoted by reference numeral 1 herein. As shown, the vapor chamber supporting structure 1 includes a first and a second plate member 2, 3, a supporting member 4, and a working fluid 5.

[0016] The first plate member 2 has a first side 21 and a second side 22 opposite to the first side 21, whereas the second plate member 3 has a third side 31 and a fourth side 32 opposite to the third side 31. The second plate member 3 is assembled to the first plate member 2 with the second side 22 of the first plate member 2 facing toward the third side 31 of the second plate member 3. On the second side 22 of the first plate member 2, there is defined a recess 221, such that a chamber 33 is formed between the second side 22 of the first plate member 2 and the third side 31 of the second plate member 3 when the second plate 3 is assembled to the first plate 2. The first and the second plate member 2, 3 are respectively made of a metal sheet, such as a copper sheet, an aluminum sheet, a copper foil-covered graphite sheet, or any other metal sheet with good heat conductivity. In the illustrated first preferred embodiment, the first and the second plate member 2, 3 are made of copper sheets without being limited thereto.

[0017] The supporting member 4 is located in the chamber 33 and correspondingly received in the recess 221. The supporting member 4 is formed by stamping, milling, casting, or other mechanical processing. In the illustrated first preferred embodiment, the supporting member 4 is integrally formed by stamping. The supporting member 4 has at least one base portion 41 and a plurality of supporting portions 42. The base portions 41 and the supporting portions 42 may have relative positions and configurations determined during stamping according to actual need in use. In the illustrated first preferred embodiment, the base portions 41 are respectively in the form of a mesh-like structure and located at two opposite ends of the supporting member 4 with one side thereof flatly attached to the third side 31 of the second plate member 3. As clearly shown in the drawings, some of the supporting portions 42 are substantially punctiform (i.e. point-like or dot-like in appearance), for example in the form of squares integrally extended from the base portions 41, while others are in the form of elongate strips provided on a central portion of the supporting member 4 with two ends connected to the base portions 41 located at two opposite ends of the supporting member 4. A plurality of passages 43 is formed between the square supporting portions 42 and between the elongate supporting portions 42 of the supporting member 4 to communicate with one another. The square supporting portions 42 located at two opposite ends of the supporting member 4 are arranged in arrays, such that the passages 43 formed therebetween are perpendicular to one another. In addition to be square in shape, the supporting portions 42 located at two opposite ends of the supporting member 4 can be otherwise rectangular, trapezoidal, round, elongated in shape, or in any other geometric shape. Furthermore, between the supporting portions 42 and the first plate member 2 there is provided a first wick structure 44. The first wick structure 44 is disposed in the recess 221 to locate between the first plate member 2 and the supporting member 4 with one side attached to the recess 221 and the other side attached to the supporting portions 42. After the second plate member 3 and the first plate member 2 are welded to each other along a joint between them, the working fluid 5 is filled in the chamber 33, and then the chamber 33 is evacuated and sealed to complete the vapor chamber supporting structure 1. The supporting member 4 is directly stamped to form the base portions 41 and the supporting portions 42. The base portions 41 and the supporting portions 42 in the chamber 33 can effectively support the first and the second plate member 2, 3, allowing the working fluid 5 to circulate in the chamber 33 via the first wick structure 44. With these arrangements, the vapor chamber supporting structure 1 formed by stamping can be manufactured at reduced labor and time cost, provide upgraded heat transfer efficiency, and overcome the problems of deformation under pressure and uncontrollable bottom flatness as found in the prior art vapor chambers.

[0018] Please refer to FIG. 4, which is an exploded perspective view of the vapor chamber supporting structure 1 according to a second preferred embodiment of the present invention, and to FIG. 5, which is a fragmentary, assembled sectional view of FIG. 4. As shown, the second preferred embodiment of the vapor chamber supporting structure 1 is generally structurally similar to the first preferred embodiment except that, in this second preferred embodiment, between the second plate member 3 and the supporting member 4 there is further provided a second wick structure 45. The second wick structure 45 has one side attached to the third side 31 of the second plate member 3 and the other side attached to the base portions 41. After the second plate member 3 and the first plate member 2 are welded to each other along the joint between them, the working fluid 5 is filled in the chamber 33, and then the chamber 33 is evacuated and sealed to complete the vapor chamber supporting structure 1. The supporting member 4 is directly stamped to form the base portions 41 and the supporting portions 42. The base portions 41 and the supporting portions 42 in the chamber 33 can effectively support the first and the second plate member 2, 3, allowing the working fluid 5 to circulate in the chamber 33 via the first and the second wick structure 44, 45. With these arrangements, the vapor chamber supporting structure 1 formed by stamping can be manufactured at reduced labor and time cost, provide upgraded heat transfer efficiency, and overcome the problems of deformation under pressure and uncontrollable bottom flatness as found in the prior art vapor chambers.

[0019] Please refer to FIG. 6, which is an exploded perspective view of the vapor chamber supporting structure 1 according to a third preferred embodiment of the present invention, and to FIG. 7, which is a perspective view of the supporting member 4 included in the third preferred embodiment of the present invention. As shown, the third preferred embodiment of the vapor chamber supporting structure 1 is generally structurally similar to the first preferred embodiment except that, in this third preferred embodiment, the base portions 41 and the supporting portions 42 are differently arranged in position. In the illustrated third preferred embodiment, there are a first group of elongate supporting portions 42 extended from and connected to between inner ends of two base portions 41 and a second group of elongate supporting portions 42 further extended from an outer end of one of the two base portions 41. Again, a plurality of passages 43 is formed between the elongate supporting portions 42 and between the square supporting portions 42. It is understood the position arrangement of the base portions 41 and the supporting portions 42 is not necessarily limited to that shown in the third preferred embodiment but can be changed according to actual need in use.

[0020] The present invention has been described with some preferred embodiments thereof and it is understood that many changes and modifications in the described embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.