Heat-dissipating fin

Abstract

A heat-dissipating fin includes a sheety main body. The main body is provided with a high-temperature area located at each of two sides thereof, an airflow area located at a midsection thereof for an external airflow to pass through, at least one guide wall formed at the airflow area and having a front end facing the main body, and two inclined guide portions each extending rearward toward one side thereof from a front end thereof. In this way, the external airflow can be guided to the high-temperature areas of the fin to reach greater heat-dissipating efficiency.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to heat-dissipating apparatuses, and more particularly, to a heat-dissipating fin.

2. Description of the Related Art

A conventional multi-layer heat sink is composed of multiple fins stacked upon one another, having at least one heat pipe running through the fins. Each of the fins is flat on the surface thereof and provided with none of any runners. A cooling fan is mounted to one side of the fins for generating airflow and enabling the airflow to pass through the gaps between the fins to blow the heat on the fins away.

When the aforesaid heat sink is in use, the temperature distribution on the surface of each of the fins is virtually nonuniform, e.g. the temperature on each of the fins at where is close to the heat pipe is higher and lower at where is farther away from the heat pipe. However, each of the fins is not provided with any runners, when the airflow enters the gaps between the fins, the airflow fails to be effectively guided to where the temperature is higher but directly passes through the gaps. Therefore, the high-dissipating efficiency of the conventional heat sink needs improvement.

The U.S. Patent Pub. No. 2008/0017350 disclosed a heat sink having a plurality of parallel fins, each of which is provided with a plurality of protrusions for disturbing the airflow entering the gaps between the fins and further enhancing the heat-dissipating efficiency. However, such heat sink does nothing but disturbs the airflow rather than guiding the airflow up to where the temperature is higher on the fins.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a heat-dissipating fin which can reach greater heat-dissipating efficiency.

The foregoing objective of the present invention is attained by the heat-dissipating fin having a sheety main body. The main body is provided with a high-temperature area located at each of two sides thereof, an airflow area located at a midsection thereof for an external airflow to pass through, at least one guide wall formed at the airflow area and having a front end facing the main body, and two inclined guide portions each extending rearward toward one side thereof from a front end thereof. In this way, the external airflow can be guided to the high-temperature areas of the fin to result in more efficient thermal dissipation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a first preferred embodiment of the present invention.

FIG. 2 is a perspective view of the first preferred embodiment of the present invention applied to a heat sink.

FIG. 3 is a top view of the first preferred embodiment of the present invention, illustrating the path of the airflow.

FIG. 4 is a perspective view of a second preferred embodiment of the present invention.

FIG. 5 is a perspective view of the second preferred embodiment of the present invention applied to a heat sink.

FIG. 6 is a perspective view of the second preferred embodiment of the present invention, illustrating the path of the airflow.

FIG. 7 is a top view of a third preferred embodiment of the present invention, illustrating the path of the airflow.

FIG. 8 is a top view of a fourth preferred embodiment of the present invention, illustrating the path of the airflow.

FIG. 9 is a perspective view of a fifth preferred embodiment of the present invention applied to a heat sink.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Referring to FIG. 1, a heat-dissipating fin 10 constructed according to a first preferred embodiment of the present invention includes a sheety main body 11. The sheety main body 11 is provided with a high-temperature area 12 located at each of two sides thereof. Each of the high-temperature areas 12 has a plurality of through holes 121, each of which is provided for a heat pipe 91 to pass through. The main body 11 is provided with an airflow area 18 located at a midsection thereof for airflow to pass through. The main body 11 is provided with a peripheral sidewall 13 extending vertically outward from an external edge of each of the through holes 121 for a predetermined height. A guide wall 14 having a predetermined height is formed at the airflow area 18, having a front end 141 facing a front end of the main body 11. Two inclined guide portions 142 are formed on the guide wall 14, each extending rearward toward each of two sides thereof from the front end 141 for a predetermined length. Each of the inclined guide portions 142 has a distal end spaced from one of two lateral edges of the main body 11 and from the corresponding through hole 121 for a predetermined distance. The guide wall 14 has a gap 143 formed at the front end 141.

Referring to FIG. 2, when the heat-dissipating fin 10 of the present invention is applied to this embodiment, a lot of the heat-dissipating fins 10 are mounted upon one another, and a plurality of heat pipes 91 for transmitting the heat generated by a heat-generating element (not shown) are inserted through the through holes 121 to cling to the peripheral sidewalls 13 of the through holes 121. When the heat-dissipating fin 10 is in use, the heat pipe 91 is provided with high homogeneous temperature distribution to transmit the heat of the heat-generating element to the heat-dissipating fins 10, such that the maximum temperature happens at the abutment of the main body 11 and the heat pipe 91, i.e. it happens within the high-temperature area 12. As shown in FIG. 3, the path and direction of the airflow are indicated by arc-shaped arrows. When the airflow enters the space on/beneath the main body 11 from its front side, most of the airflow is bisected by the front end 141 of the guide wall 14 and then flow bilaterally sideward and rearward along the inclined guide portions 142; next, the bisected airflow flows to the neighborhood of the through holes 121 and the heat pipes 91 and then out of the main body 11. In other words, the airflow on/beneath the fin 10 can be guided to where the temperature is higher on the main body 11 for efficient thermal dissipation. Besides, the other part of the airflow flows through the gap 143 and then out of the main body 11.

Referring to FIGS. 4-6, a heat-dissipating fin 20 constructed according to a second preferred embodiment of the present invention is similar to that of the first embodiment of the present invention, having the following difference. The main body 21 includes a convexity 26, which is formed at a center of the airflow area 28 and convex downward in this embodiment. The guide wall 24 is formed to surround the convexity 26 and the distal ends of the two inclined guide portions 242 are connected at a front end of the convexity 26, thus being in the form of water drip.

The operative manner of the second embodiment of the present invention is identical to the first embodiment. In effect, the airflow guided to the bilateral sides converge while flowing to the rear side of the guide wall 24, such that the whole airflow guidance is more efficient to reduce the noise and to help the airflow be exhausted outside from the rear side.

Referring to FIG. 7, a heat-dissipating fin 30 constructed according to a third preferred embodiment of the present invention is similar to that of the first embodiment of the present invention, having the following difference. The main body 31 includes two guide walls 34, one of which is located in front of the other. Each of the two guide walls 34 is provided with a gap 343 formed at a front end thereof. The gap of the front guide wall 34 is larger than that of the rear guide wall 34. The main body 31 is further provided with at least one rear through hole 321 located behind the gap 343 of the rear guide wall 34.

The operative status of the third embodiment is similar to that of the first embodiment, having the following difference. The airflow enters the space on/beneath the main body 31 and then encounters the front guide wall 34, a first part of the airflow is guided by the inclined guide portions 342 to flow bilaterally rearward along the inclined guide portions 342, and the other second part of the airflow passes through the gap 343 of the front guide wall 34. Next, when the second part of the airflow encounters the rear guide wall 34, some of the second part of the airflow is guided by the rear guide wall 34 to flow rearward along the inclined guide portion 342 and the other of the second part of the airflow passes through the gap 343 of the rear guide wall 34 to flow to the neighborhood of the rear through hole 321, i.e. the heat pipe. The design that the gap 343 of the front guide wall 34 is larger than that of the rear guide wall 34 allows more air to flow to the rear side of the main body 31, thus facilitating efficient thermal dissipation at the rear side of the main body 31. Therefore, the airflow can likewise be guided to the corresponding high-temperature location on the heat-dissipating fin to reach more heat-dissipating efficiency.

Referring to FIG. 8, a heat-dissipating fin 40 constructed according to a fourth preferred embodiment of the present invention is similar to that of the first embodiment of the present invention, having the following difference.

The main body 41 includes three guide walls 44 arranged in tandem and located at the airflow area 48. The rearmost guide wall 44 is not provided with any gap, and the other two guide walls 44 each are provided with a gap 443 formed at a front end thereof. The gap of the rear guide wall 44 is larger than that of the front guide wall 44.

The operative status of the fourth embodiment is similar to the third embodiment, having the following difference. The rearmost guide wall 44 does not have any gap, such that the airflow is directly guided bilaterally rearward along the rear most guide wall 4 to flow out of the main body 41 while flowing to the rearmost guide wall. Therefore, the airflow can likewise be guided to the corresponding high-temperature location on the heat-dissipating fin to bring more efficient thermal dissipation.

Referring to FIG. 9, a heat-dissipating fin 50 constructed according to a fifth preferred embodiment of the present invention is similar to that of the first embodiment of the present invention, having the following difference.

Each of two thermally conductive plates 57 is connected with one of the two sides of the main body 51 for connection with a heat-generating element (not shown) and with at least one heat pipe 91. The heat generated by the heat-generating element can be conducted to the two sides of the main body 51, enabling the maximum temperature to be located in the neighborhood that the main body 51 contacts the two thermally conductive plates 57, i.e. the maximum temperature happens within the high-temperature area 52. The guide wall 54 guides the airflow to the high-temperature areas 52 located at the two sides of the main body 51 to reach more heat-dissipating efficiency. Therefore, the airflow can likewise be guided to the corresponding high-temperature location on the heat-dissipating fin to bring more efficient thermal dissipation.

In conclusion, when the airflow enters, the present invention can guide the airflow to the high-temperature areas on the heat-dissipating fin in such a way that the airflow takes more heat out to reach more heat-dissipating efficiency.

Although the present invention has been described with respect to specific preferred embodiments thereof, it is no way limited to the details of the illustrated structures but changes and modifications may be made within the scope of the appended claims.

Claims

1. A heat-dissipating fin comprising a sheety main body having two high-temperature areas, each of which is located at one of two sides thereof, said main body having an airflow area located at a midsection thereof for airflow to pass through, said main body having at least one guide wall located at said airflow area and having a front end facing a front side of said main body, said at least one guide wall having two inclined guide portions extending bilaterally rearward from the front end thereof.

2. The heat-dissipating fin as defined in claim 1, wherein said main body comprises convexity formed at a center thereof; said guide wall is located in front of said convexity.

3. The heat-dissipating fin as defined in claim 2, wherein said convexity is in the form of water drip.

4. The heat-dissipating fin as defined in claim 1, wherein each of said two inclined guide portions comprises a distal end spaced from one of two lateral edges of said main body.

5. The heat-dissipating fin as defined in claim 1, wherein said at least one guide wall comprises a gap formed at a front end thereof.

6. The heat-dissipating fin as defined in claim 1, wherein said main body comprises at least two of said guide walls arranged in tandem, each of said at least two guide walls having a gap formed at a front end thereof, the gap of said anterior guide wall being larger than that of said posterior guide wall, said main body having a rear through hole running through a rear side thereof and located at the rear most guide wall.

7. The heat-dissipating fin as defined in claim 1, wherein said main body comprises at least two of said guide walls arranged in tandem, each of said at least two guide walls having a gap formed at a front end thereof, the gap of said anterior guide wall being larger than that of said posterior guide wall.

8. The heat-dissipating fin as defined in claim 1, wherein each of said two high-temperature areas comprises at least one through hole provided for a heat pipe to pass through.

9. The heat-dissipating fin as defined in claim 8, wherein said main body comprises a peripheral sidewall extending vertically outward from an external edge of each of said through holes.

10. The heat-dissipating fin as defined in claim 1 further comprising a thermally conductive plate, wherein said thermally conductive plate is connected with at least one of the two sides of said main body.