Combined heat sink

A combined heat sink has multiple dissipation fins serially mounted together. Each one of the dissipation fins has a body and two flanges. The body has at least one through hole formed through the body. The two flanges are respectively formed on one of two surfaces of the body, and have at least one connecting arm. Multiple protrusions protrude on the at least one connecting arm, and a width of the at least one through hole is smaller than a total width of the at least one connecting arm and the multiple protrusions. When the multiple dissipation fins are mounted together, the protrusions of the at least one connecting arm of each dissipation fin pass through the at least one through hole of an adjacent one of the dissipation fins, and abut an area near the at least one through hole to avoid separations of the dissipation fins.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a heat sink, and more particularly to a combined heat sink that comprises multiple dissipation fins combined together.

2. Description of Related Art

Heat dissipation has become more and more crucial as electronic equipments have been highly developed with complex functions. A conventional heat sink is formed by multiple dissipation fins combined together, and methods for combination greatly influence manufacture efficiency of the conventional heat sink.

Taiwan Patent No. M376877 discloses a conventional combined heat sink comprising multiple dissipation fins. Each one of the dissipation fins has two L-shaped connection arms. A user has to bend the two connection arms of one of the dissipation fins to respectively pass through two holes on another one of the dissipation fins, so as to combine the two dissipation fins together. However, such a combination method leads to complicated assembly procedure of the conventional combined heat sink, which makes it difficult for the user to firmly assemble the multiple dissipation fins.

To overcome the shortcomings, the present invention provides a combined heat sink to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a combined heat sink that may be assembled firmly in an easy way.

A combined heat sink in accordance with the present invention has multiple dissipation fins serially mounted together, and each one of the multiple dissipation fins has a body and two flanges. The body has two surfaces and at least one through hole formed through the body. The two flanges are respectively formed on one of the two surfaces of the body, and have at least one connecting arm connected to one of the two flanges. Multiple protrusions protrude on the at least one connecting arm separately, and a width of the at least one through hole is smaller than a total width of the at least one connecting arm and the multiple protrusions.

When the multiple dissipation fins are mounted together, the multiple protrusions of the at least one connecting arm of each one of the dissipation fins pass through the at least one through hole of an adjacent one of the dissipation fins, and abut an area near the at least one through hole to avoid separations of the multiple dissipation fins.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference toFIGS. 1 and 2, a combined heat sink comprises multiple dissipation fins10aligned and serially mounted together. For the sake of convenience, only two dissipation fins10,10A are shown in the drawings, but the amount of the dissipation fins10is not limited in the present invention.

With reference toFIGS. 1 to 3, each one of the multiple dissipation fins10has a body11and two flanges. The body11and the two flanges are formed as one piece. The body11is a metal slice having a good heat-dissipating ability. The body11has two surfaces and at least one through hole111. In the first embodiment of the present invention, the body11has two through holes111. The two through holes111are formed through the two surfaces of the body11, respectively, and are aligned with each other near a top side of the body11.

The two flanges of the dissipation fin10connected to the body11are formed by a punching process, and respectively are a connecting flange12and an abutting flange13. The connecting flange12is formed on a surface of the body11from the top side of the body11, near the two through holes111. The connecting flange12has at least one connecting arm121. The at least one connecting arm121is connected to the connecting flange12at a location corresponding to the at least one through hole111of the body11.

In the first embodiment of the present invention, the connecting flange12has two connecting arms121. The two connecting arms121are disposed at a spaced interval on a bottom surface of the connecting flange12. The two connecting arms121protrude from an edge, which is located away from the body11, of the connecting flange12. As shown inFIG. 2, each one of the two connecting arms121transversely aligns with a respective one of the two through holes111, and has two protrusions122on two sides of the connecting arms121, respectively. In addition, a width of each one of the two through holes111is slightly smaller than a total width of each one of the two connecting arms121and the two protrusions122of the corresponding connecting arm121, so that each one of the two connecting arms121may be forced to pass through the corresponding through hole111.

Besides, the connecting arms121and the protrusions122are made of a material with plasticity.

In the first embodiment of the present invention, each one of the protrusions122is a barb. Alternatively, each of the protrusions122may be a mounting boss.

The abutting flange13is formed on the same surface of the body11with the connecting flange12, and is located on a bottom side of the body11, which is located away from the connecting flange12. Moreover, a length of the abutting flange13is equal to a length of the connecting flange12, wherein a length of the two connecting arms121, which are located underneath, is not included. Therefore, an edge of the abutting flange13and the edge of the connecting flange12are aligned in a direction parallel to the surfaces of the body11.

With reference toFIGS. 2 and 3, when two of the multiple dissipation fins10,10A are mounted together, the two connecting arms121A of one of the dissipation fins10,10A are forced to pass through the two through holes111of the other one of the two dissipation fins10. The two protrusions122A of each connecting arm121A then abut against an area near the corresponding through hole111on the surface of the body11of the other dissipation fin10. The edges of the connecting flange12A and the abutting flange13A of the dissipation fin10A abut on the surface of the body11, which is located away from the connecting flange12and the abutting flange13, of the other dissipation fin10. As a result, the two dissipation fins10,10A are fixed together.

With reference toFIG. 4, in a second embodiment of the present invention, a combined heat sink in accordance with the present invention differs from the first embodiment in that the connecting flange22and the abutting flange23are respectively formed on the two different surfaces of the body21of one of the multiple dissipation fins20. That is to say, when the multiple dissipation fins20are mounted together through the connecting arms221, the connecting flange22and the abutting flange23of one of the multiple dissipation fins20abut against different dissipation fins20.

With the aforementioned technical characteristics, the combined heat sink in accordance with the present invention has the following advantages.

1. To assemble one dissipation fin10,20with the others, a user may press the multiple dissipation fins10,20together, in order to force the at least one connecting arm121,221to pass through a corresponding through hole111of the other dissipation fin10,20. Then the dissipation fins10,20may be fixed firmly together to become the combined heat sink.

2. Furthermore, the assembly of the dissipation fins10,20is thus simplified through structural arrangements in the combined heat sink in accordance with the present invention.