Method for manufacturing a heat sink

A method for manufacturing a heat sink includes providing a heat-conducting base with a plurality of open troughs; providing a plurality of heat pipes, each having a heat-absorbing section and a heat-releasing section extending from the heat-absorbing section; the heat-absorbing section being accommodated in one open trough to have the heat pipe engaged with the heat-conducting base; providing a plurality of heat-dissipating fins, each of the heat-dissipating fins having a lower plate and an upper plate extending from the lower plate, the upper plate being folded to form an overlapping portion attached on the lower plate; forming a through-hole in the lower plate and the upper plate at the overlapping portion; and penetrating the through-holes of the heat-dissipating fins by the heat-releasing section of the heat pipe. In this way, the heat-dissipating area in the same height can be increased, thereby improving the heat-dissipating efficiency of the heat sink.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a heat-dissipating fin, a heat sink and a method for manufacturing the same, and in particular to a heat-dissipating fin capable of increasing heat-dissipating area, a heat sink having such heat-dissipating fins, and a method for manufacturing the same.

2. Description of Prior Art

A common heat sink usually includes a heat-conducting base, a plurality of heat pipes and a plurality of heat-dissipating fins. The heat-conducting base is adhered to a heat-generating electronic element. The heat pipe includes a heat-absorbing section and two heat-releasing sections extending from both ends of the heat-absorbing section. Such kind of heat pipe is usually formed into U shape. The heat-absorbing section is inserted into the heat-conducting base, while the heat-releasing section penetrates the respective heat-dissipating fins. The heat generated by the heat-generating electronic element is first conducted to the heat-conducting base. Then, the heat-conducting base conducts the heat to the heat pipe. Finally, the heat pipe conducts the heat to the heat-dissipating fins. The heat is dissipated to the ambient air from the surfaces of the heat-dissipating fins.

However, in practice, such a heat sink still has some problems. Since the heat pipe in such a heat sink is formed into U shape and the heat-dissipating fins are penetrated directly by the heat pipe, the central portion of each heat-dissipating fin is located farther from the heat-releasing section of the heat pipe. As a result, this portion of each heat-dissipating fin is poor in heat-dissipating efficiency. Further, the waste heat generated by the heat-generating electronic element will be accumulated in the heat-conducting base, which affects the heat-dissipating efficiency of the whole heat sink.

Therefore, it is an important issue for the present Inventor to solve the above-mentioned problems.

SUMMARY OF THE INVENTION

The present invention is to provide a heat sink having heat-dissipating fins capable of increasing heat-dissipating area, and a method for manufacturing the same. Each of the heat-dissipating fins is bent to be overlapped with each other, whereby the density of the heat-dissipating fins can be increased in a limited space. Further, in this way, the heat-dissipating area of each heat-dissipating fin can be increased, so that the heat-dissipating efficiency of the whole heat sink can be enhanced.

The present invention is to provide a heat-dissipating fin capable of increasing heat-dissipating area, which includes a lower plate and an upper plate. The lower plate is provided with a through-hole. The upper plate extends from the lower plate and is bent to be overlapped on the lower plate, thereby forming a heat-dissipating path there between.

The present invention provides a heat sink having heat-dissipating fins capable of increasing heat-dissipating area, which includes a heat pipe and a plurality of heat-dissipating fins. The heat pipe has a heat-absorbing section and a heat-releasing section extending from the heat-absorbing section. The heat-dissipating fin has a lower plate and an upper plate extending from the lower plate. The upper plate is bent to be overlapped on the lower plate, thereby forming a heat-dissipating path there between. The lower plate and the upper plate are provided with a through-hole respectively in such a manner that these two through-holes correspond to each other. The heat-releasing section of the heat pipe penetrates the through-holes of the heat-dissipating fins successively.

The present invention provides a method for manufacturing the heat sink having heat-dissipating fins capable of increasing heat-dissipating area, including the steps of: a) providing a heat-conducting base and a heat pipe; b) inserting the heat pipe into the heat-conducting base; c) providing a plurality of heat-dissipating fins, each of the heat-dissipating fins having a lower plate and an upper plate extending from the lower plate, the upper plate being bent to be overlapped on the lower plate; d) forming a through-hole in the lower plate and the upper plate respectively in such a manner that these two through-holes correspond to each other; and e) penetrating the through-holes of the heat-dissipating fins by the heat pipe.

In comparison with prior art, the present invention has advantageous effects as follows. The density of the heat-dissipating fins is increased in a limited space, so that the heat-dissipating area is increased accordingly. Further, each of the heat-dissipating fins can extend outwards and laterally according to practical demands. A heat-dissipating body can be further adhered to the heat-conducting base so as to increase the heat-conducting efficiency of the heat-conducting base. Further, the bottom of the heat-absorbing section of the heat pipe is a flat surface, so that it is in flush with the bottom of the heat-conducting base. In this way, such a heat sink can be adhered to a heat-generating electronic element more tightly so as to increase the heat-conducting efficiency.

DETAILED DESCRIPTION OF THE INVENTION

The characteristics and technical contents of the present invention will be explained in more detail with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit the present invention.

Please refer toFIGS. 1 to 3.FIG. 1is a perspective view showing the external appearance of the heat-dissipating fin of the present invention.FIG. 2is a side view of the heat-dissipating fin of the present invention.FIG. 3is an exploded perspective view of the present invention. The present invention provides a heat sink1having heat-dissipating fins capable of increasing heat-dissipating area, which includes a heat-conducting base10, plurality of heat pipes20, a plurality of heat-dissipating fins30and a heat-dissipating body40.

The bottom of the heat-conducting base10is provided with a plurality of open troughs11. The heat-conducting base10is adhered to a heat-generating electronic element (not shown). In the present embodiment, the number of the heat pipe20is three, but it is not limited thereto.

The heat pipe20has a heat-absorbing section21and two heat-releasing sections22formed by bending and extending from both ends of the heat-absorbing section21, so that the heat pipe20is formed into U shape. Further, an accommodating space c is formed between the two heat-releasing sections22. The heat-absorbing section21is accommodated in the open trough11and inserted into the heat-conducting base10. Further, as shown inFIG. 6, the bottom of the heat-absorbing section21is formed into a flat surface that is in flush with the bottom of the heat-conducting base10. In this way, the heat sink1can be adhered to the heat-generating electronic element (not shown) more tightly, thereby achieving a better heat-conducting efficiency.

The periphery of the through-hole33is formed with an inner annular wall311extending from the lower plate31and an outer annular wall321extending from the upper plate32. The inner annular wall311is adhered to the outer annular wall321. The inner annular wall311is brought into thermal contact with the heat-releasing section22of the heat pipe20.

The heat-dissipating body40is adhered to the heat-conducting base10and is disposed among the heat-dissipating fins30. That is, the heat-dissipating body30is disposed in the accommodating space c. The heat-dissipating body40has a base41brought into thermal contact with the heat-conducting base10and a plurality of extension pieces42extending upwards from the base41. The extension pieces42are arranged at intervals, thereby forming an airflow path d between any two extension pieces42.

Please refer toFIGS. 4 and 5.FIG. 4is an assembled perspective view of the present invention, andFIG. 5is a partially cross-sectional view taken along the line5-5inFIG. 4. As shown inFIG. 4, the heat-releasing sections22of the heat pipe20penetrate the heat-dissipating fins30. According to the practice demands, the dimension of the upper plate32or the lower plate31can be varied. For example, the upper plate32or the lower plate31may extend laterally so as to increase the heat-dissipating area.

Please refer toFIGS. 6 to 8.FIG. 6is a schematic view (I) showing the manufacture of the heat-dissipating fin of the present invention.FIG. 7is a schematic view (II) showing the manufacture of the heat-dissipating fin of the present invention.FIG. 8is a schematic view (III) showing the manufacture of the heat-dissipating fin of the present invention. First, the upper plate32is folded to be overlapped on the lower plate31. Then, the upper plate32and the lower plate31are processed to have a through-hole33respectively in such a manner that these through-holes correspond to each other. Finally, a forming tool is used to process the upper plate32and the lower plate31to make them form respectively an inner annular wall311and an outer annular wall321adhered to the inner annular wall311.

Please refer toFIGS. 9 to 11.FIG. 9is side cross-sectional view of the present invention.FIG. 10is side cross-sectional view showing the operating state of the present invention.FIG. 11is side cross-sectional view showing the operating state of the present invention. As shown inFIG. 9, the extension pieces42extend upwards from the base41and are disposed in the accommodating space c between the heat-dissipating fins30on both sides. With this arrangement, the heat of the heat-conducting base10not only can be conducted by the heat pipe20, but also can be dissipated by the extension piece42of the heat-dissipating body40. Thus, the heat-dissipating efficiency can be increased.

As shown inFIG. 10, the upper plate31or the lower plate32of the heat-dissipating fin30can be extended or expanded in the horizontal direction according to the practical demands, thereby increasing the heat-dissipating efficiency.

As shown inFIG. 11, the bottom of the heat-conducting base10and the bottom of the heat-absorbing section21are adhered to a surface of a heat-generating electronic element60. The direction indicated by the arrows in this figure is the direction of conducting the waste heat generated by the electronic element60. The waste heat can be conducted from the heat-absorbing section21of the heat pipe20to the heat-releasing sections22. Then, the heat is conducted to the heat-dissipating fins30. Finally, the heat is dissipated to the air from the surfaces of the heat-dissipating fins30to complete the heat dissipation.

Alternatively, the waste heat generated by the electronic element60is conducted to the heat-conducting base10. Then, the heat is conducted from the heat-conducting base10to the surfaces of the extension pieces42of the heat-dissipating body40. Finally, the heat is taken away by flowing air to complete the heat dissipation. With the combination of these two heat-dissipating mechanisms, the heat-conducting efficiency of the heat sink1can be improved.

Please refer toFIG. 12, which is a flow chart showing the method of the present invention. The present invention provides a method for manufacturing a heat sink having heat-dissipating fins capable of increasing heat-dissipating area, which includes the steps as follows.

In a step101, a heat-conducting base10and a heat pipe20are provided.

In a step102, the heat-conducting base10and the heat pipe20are assembled together. A portion of the heat pipe20is inserted into the heat-conducting base10, while the other portion of the heat pipe20is exposed to the outside of the heat-conducting base10. More specifically, the heat-absorbing section21of the heat pipe20is received in the open trough11of the heat-conducting base10and is adhered tightly to the heat-conducting base10. The heat-releasing sections22of the heat pipe20are located on both sides of the heat-conducting base10.

In a step103, the heat-dissipating fins30are bent. The upper plate32is bent to be overlapped on the lower plate31. As shown inFIGS. 1 and 2, the lengths of the lower plate31and the upper plate32after bending are not identical to each other, so that a heat-dissipating path b is formed there between. Further, the distal end of the upper plate32is warped and not adhered to the lower plate31completely so as to increase the heat-dissipating area of the heat-dissipating fin30. However, the construction of the heat-dissipating fin30is not limited to the above-mentioned form. For example, the distal end of the lower plate31may be warped.

In a step104, the heat-dissipating fin30is processed to extend laterally. A forming tool70is used to press the upper plate32and the lower plate31to make them respectively form an annular wall311and an outer annular wall311adhered to the inner annular wall311. More specifically, the pressing direction of the forming tool70is upward from the underside of the lower plate31. Thus, the inner annular wall311is formed by extending the lower plate31, while the outer annular wall321is formed by extending the upper plate32. The inner annular wall311is adhered to the outer annular wall321tightly.

In a step105, the heat-dissipating fins30are assembled together. The heat pipe20penetrates the through-holes33of the heat-dissipating fins30successively.

In a step106, a heat-dissipating body40is assembled. The heat-dissipating body40is adhered to the heat-conducting base10. The extension pieces42of the heat-dissipating body40are arranged in the accommodating space c between the heat-releasing sections22.

Please refer toFIG. 13, which is a side cross-sectional view of the heat-dissipating fin according to another embodiment of the present invention. The upper plate32of the heat-dissipating fin30is bent to be overlapped on the lower plate31, thereby forming a heat-dissipating path b there between. In the present embodiment, the lower plate31is provided with a through-hole33. The periphery of the through-hole33is formed with an annular wall34, but it is not limited thereto.

Please refer toFIG. 14, which is a side cross-sectional view of the heat-dissipating fin according to a further embodiment of the present invention. In the present embodiment, the heat pipe20is a flat pipe. Thus, the base41of the heat-dissipating body40can be adhered to the heat-absorbing section21directly. The bottom surface of the heat-absorbing section21can be adhered to a heat-generating electronic element (not shown) directly. Therefore, the number of the components of the heat sink1can be reduced. Further, the heat transfer loss among the plurality of components can be thus reduced. Thus, the heat-conducting efficiency of the heat sink1can be guaranteed.

According to the above, the present invention demonstrates industrial applicability, novelty and inventive steps. Further, the construction of the present invention has not been seen in the products of the same kind or let in public use. Thus, the present invention conforms to the requirements for an invention patent.