HEAT SINK STRUCTURE

Abstract

A heat sink structure includes a plurality of radiation fins and a base. Each of the radiation fins has a connecting end and a free end, and internally defines a chamber extended between the connecting end and the free end for filling a working fluid therein. The base has an upper connecting surface provided with a plurality of connecting sections and a lower heat receiving surface in contact with a heat source. The connecting ends of the radiation fins are integrally connected to the connecting sections of the base in one-to-one correspondence through overmolding, so as to eliminate thermal resistance between the radiation fins and the base.

Claims

1. A heat sink structure, comprising: a plurality of radiation fins respectively having a connecting end and a free end; each of the radiation fins internally defining a chamber extended between the connecting end and the free end, and the chambers having a working fluid filled therein; and a base having an upper and a lower side serving as a connecting surface and a heat receiving surface, respectively; the heat receiving surface being in contact with a heat source, and the connecting surface being integrally connected to the connecting ends of the radiation fins through overmolding.

2. The heat sink structure as claimed in claim 1, wherein the connecting surface has a plurality of connecting sections integrally formed thereon; the connecting ends of the radiation fins being extended into and accordingly integrally connected to the connecting sections through overmolding, such that the connecting ends are enclosed in the connecting sections in one-to-one correspondence, allowing the radiation fins to be stably and integrally connected to the base.

3. The heat sink structure as claimed in claim 1, wherein the working fluid is selected from the group consisting of a gas and a liquid.

4. The heat sink structure as claimed in claim 1, wherein the radiation fins and the base may be made of the same or different materials.

5. The heat sink structure as claimed in claim 1, wherein the radiation fins are subjected to working fluid filling and vacuum evacuation only after the radiation fins have been integrally connected to the base through overmolding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The 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

[0014] FIG. 1 is an exploded perspective view showing a heat sink structure according to a preferred embodiment of the present invention; and

[0015] FIG. 2 is an assembled sectional view of the heat sink structure of FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The present invention will now be described with some preferred embodiments thereof and by referring to the accompanying drawings.

[0017] Please refer to FIGS. 1 and 2, which are exploded perspective and assembled sectional views, respectively, of a heat sink structure 1 according to a preferred embodiment of the present invention. As shown, the heat sink structure 1 includes a plurality of radiation fins 11 and a base 12.

[0018] Each of the radiation fins 11 has a connecting end 111 and a free end 112 and internally defines a vacuum chamber 113 that is extended between the connecting end 111 and the free end 112. A working fluid 2 is filled in the chamber 113, and the working fluid 2 can be a gas or a liquid.

[0019] The base 12 has an upper and a lower side, which serve as a connecting surface 121 and a heat receiving surface 122, respectively. The heat receiving surface 122 is in contact with at least one heat source, while the connecting surface 121 faces toward the connecting ends 111 of the radiation fins 11 and has a plurality of connecting sections 1211 formed thereon. The connecting ends 111 of the radiation fins 11 are extended into and accordingly integrally connected to the connecting sections 1211 through overmolding. In other words, the connecting ends 111 are enclosed in the connecting sections 1211 in one-to-one correspondence. The connecting ends 111 may be respectively in the form of an inverted letter T or a letter L, or in any other suitable geometric shape. In the preferred embodiment, the connecting ends are respectively non-restrictively shown as an inverted letter T, and the connecting sections 1211 completely enclose the inverted T-shaped connecting ends 111 through overmolding, so that the radiation fins 11 are stably and integrally connected to the base 12 without forming any clearance between the connecting ends 111 and the base 12. With the special design of the connecting ends 111, the radiation fins 11 are protected against the risk of being extracted from the connecting sections 1211 on the base 12.

[0020] The radiation fins 11 and the base 12 may be made of the same or different materials. The material suitable for making the radiation fins 11 and the base 12 may be any one of copper, aluminum, stainless steel, or a combination thereof. It is noted the radiation fins 11 are connected to the base 12 through overmolding before the chambers 113 thereof are subjected to the procedures of working fluid filling and vacuum evacuation.

[0021] The main purpose of overmolding the radiation fins 11 and the base 12 before the working fluid filling and the vacuum evacuation is to prevent the working fluid 2 in the chamber 113 of the radiation fins 11 from being vaporized at the high temperature when the radiation fins 11 are connected to the base 12 through overmolding, in order to maintain good heat exchange function that is achieved through efficient vapor-liquid circulation of the working fluid 2 in the radiation fins 11. Therefore, it is preferable to connect the radiation fins 11 to the base 12 through overmolding before the radiation fins 11 are filled with the working fluid 2 and vacuum evacuated. Then, the radiation fins 11 are sealed.

[0022] The present invention is characterized in providing a type of radiation fins 11 for highly-efficient heat transfer. More specifically, the radiation fins 11 respectively have an internal chamber 113 filled with the working fluid 2, which may be a gas or a liquid; and the working fluid 2 is filled only after the radiation fins 11 have been integrally connected to the base 12 through overmolding without leaving any clearance between the radiation fins 11 and the base 12 to avoid the occurrence of any thermal resistance. Then, the chambers 113 are filled with the working fluid 2 and vacuum evacuated before being sealed. In this manner, the working fluid 2 in the chambers 113 would not be vaporized at the high temperature when the radiation fins 11 are integrally connected to the base 12 through overmolding.

[0023] The present invention has been described with a preferred embodiment thereof and it is understood that many changes and modifications in the described embodiment 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.