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United States Patent Application	20030024687
Kind Code	A1
Cheng, Chung Pin ;   et al.	February 6, 2003

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Claims

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What the invention claimed is:

1. A radiation fin set comprising a plurality of metallic radiation fins arranged in parallel, said radiation fins each having a plurality of elongated slots and a plurality of flanges respectively extended along one side of each of said elongated slots and sloping in one direction at an angle of slope.

2. The radiation fin set of claim 1 wherein said radiation fins each have a through hole respectively aligned for mounting.

3. The radiation fin set of claim 1 wherein the angle of slope of said flanges is 30.degree..

4. The radiation fin set of claim 1 wherein said flanges each have at least one air vent for the passing of air.

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Description

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BACKGROUND OF THE INVENTION

[0001] The present invention relates to heat sinks and, more specifically, to a radiation fin set for heat sink, which causes the flow of air of high momentum to mix with the flow of air of low momentum, so as to repress the formation of boundary layer and to improve heat dissipation efficiency of the radiation fins.

[0002] Following fast development of computer industry, a variety of high-precision electronic elements have been developed. High-precision electronic elements achieve high operation speed, however they simultaneously produce much heat. Because electronic elements must be operated within a designed working temperature range, heat must be quickly dissipated during their operation. Various heat sinks and radiation fin designs have been disclosed for this purpose. FIG. 1 is an exploded view of a heat sink according to the prior art. This structure of heat sink comprises a heat dissipation base panel 3a for fastening to an electronic element that produces heat during its operation, a heat dissipation tube 2a fixedly fastened to the heat dissipation base panel 3a, and a metallic radiation fin set la fastened to the heat dissipation tube 2a and arranged in parallel. The radiation fin set 1a is comprised of a plurality of radiation fins 10a, each having a through hole 11a for the passing of the heat dissipation tube 2a. This design of radiation fin set la is still not satisfactory in function. As shown in FIG. 2, the quantity of motion of the flow of air 12a is gradually reduced near the downstream of the radiation fins 10a, forming a boundary layer 13a in between each two adjacent radiation fins 10a. When the boundary layer 13a becomes thick, it blocks the heat dissipation passage between each two adjacent radiation fins 10a, resulting in low heat dissipation efficiency.

SUMMARY OF THE INVENTION

[0003] The present invention has been accomplished to provide a radiation fin set for heat sink, which eliminates the aforesaid problem. It is the main object of the present invention to provide a radiation fin set for heat sink, which causes the flow of air of high momentum to mix with the flow of air of low momentum, so as to repress the formation of boundary layer and to improve heat dissipation efficiency of the radiation fins. It is another object of the present invention of the present invention to provide a radiation fin set for heat sink, which prevents the formation of wind resistance and improves the efficiency of the dissipation of heat. According to one aspect of the present invention, the radiation fin set is comprised of a plurality of metallic radiation fins. The radiation fins each have a plurality of elongated slots, and a plurality of flanges respectively extended along one side of each of the elongated slots and sloping in one direction for guiding the flow of air of high momentum into mixing with the flow of air of low momentum to repress the formation of boundary layer between each two adjacent radiation fins. According to another aspect of the present invention, the sloping flanges of the radiation fins each have at least one air vent for the passing of air to prevent formation of wind resistance.

BRIEF DESCRIPTION OF THE DRAWINGS

[0004] FIG. 1 is an exploded view of a heat sink constructed according to the prior art.

[0005] FIG. 2 is a schematic drawing illustrating the formation of boundary layer between each two adjacent radiation fins according to the prior art.

[0006] FIG. 3 is an exploded view of a heat sink constructed according to the present invention.

[0007] FIG. 3A is an enlarged view of part A of FIG. 3.

[0008] FIG. 4 is an assembly view of FIG. 3.

[0009] FIG. 5 is a schematic drawing illustrating the formation of boundary layer between each two adjacent radiation fins according to the present invention.

[0010] FIG. 6 is a perspective view of an alternate form of the heat sink constructed according to the present invention.

[0011] FIG. 7 is an elevational view of an alternate form of the radiation fin according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0012] Referring to FIGS. 3, 3A, and 4, a radiation fin set 1 is fastened to the front end 20 of a heat dissipation tube 2. The radiation fin set 1 is comprised of a number of metallic radiation fins 10 arranged in parallel. The radiation fins 10 each have a through hole 11 through which the front end 20 of the heat dissipation tube 2 is inserted to secure the radiation fins 10 in parallel, keeping the radiation fins 10 spaced from one another at an equal space. The heat dissipation tube 2 has a rear end 21 fixedly fastened to a positioning groove 30 on the top sidewall of a heat dissipation base panel 3. The heat dissipation base panel 3 is fastened to the top sidewall of an electronic device, for example, a CPU 4. During operation of the CPU 4, heat is quickly transmitted from the CPU 4 through the heat dissipation base panel 3 and the heat dissipation tube 20 to the radiation fin set 1, and then dissipated into the air from the radiation fin set 1.

[0013] The radiation fins 10 each have a plurality of elongated slots 12 and a plurality of flanges 13 respectively extended along one side of each of the elongated slots 12 and sloping in one direction at an angle 14. The flanges 13 are formed of a part of the respective radiation fin 10 upon formation of the respective elongated slots 12 by stamping. The angle of slope 14 of the flanges 13 is within 20-45.degree., or preferably 30.degree..

[0014] Referring to FIG. 5, when the quantity of motion of the flow 15 is reducing, the thickness of the boundary layer 16 is relatively increased, and the flow of air of high momentum 17 is guided through the elongated slots 12 of the radiation fins 10 to mix with the flow of air low momentum 18 to repress and destroy the boundary layer 16 between each two radiation fins 10, preventing blockage of heat dissipation passage. Thus heat can be quickly dissipated from the CPU.

[0015] FIG. 6 shows an alternate form of the radiation fin set 1 on the heat dissipation base panel 3 according to the present invention. According to this arrangement, the radiation fins 10 are directly welded (or bonded) to the top sidewall of the heat dissipation base panel 3 without the use of the aforesaid heat dissipation tube 2.

[0016] Referring to FIG. 7, air vents 19 are formed through the flanges 13 of the radiation fin 10 for the passing of currents of air. The number of the air vents 19 on each flange 13 is determined subject to the size of the flanges 13.

[0017] A prototype of radiation fin set has been constructed with the features of the annexed drawings of FIGS. 3.about.7. The radiation fin set functions smoothly to provide all of the features discussed earlier.

[0018] Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.

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