Aluminum alloy radiating fin

Abstract

The aluminum alloy cooling fin comprises a base, a connecting column, a plurality of cooling fins and a wind shield, the bottom end of the connecting column is connected to the base and extends in the vertical direction, the bottom edges of the cooling fins are connected to the base, and the inner side edges of the cooling fins spirally extend to the top from bottom to top along the outer side face of the connecting column. An air flow channel with a wide-end-up structure is formed by the heat dissipation fins, when air enters from a large opening in the upper portion and is discharged from a small opening, although the time of heat exchange between the air and the surrounding environment is short due to high flow speed and low pressure intensity, heat exchange is conducted in the whole flowing process, and the air is fully compressed and accelerated before flowing out; therefore, more heat can be taken away, and the heat dissipation efficiency can be improved; moreover, the inner side edges of the heat dissipation fins spirally extend along the connecting columns, so that the length of the air flow channel can be prolonged, the air and the heat dissipation fins have longer time for heat exchange, and the heat dissipation effect is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat sinks, in particular to an aluminum alloy heat sink. Background Art

[0002] A heat sink is a device for dissipating heat from heat-generating electronic components in an electrical appliance. It is mostly made of aluminum alloy, brass or bronze in the form of plates, sheets, multi-sheets, etc. For example, a heat sink is used for the CPU (Central Processing Unit) in a computer, and power tubes, line tubes in a television, and power amplifier tubes in a power amplifier all need to use heat sinks. Generally, a layer of thermal grease needs to be applied on the contact surface between the electronic component and the heat sink during use, so that the heat generated by the component can be more effectively conducted to the heat sink and then dissipated into the surrounding air through the heat sink.

[0003] If the heat dissipation effect of the heat sink is not good enough, the heat dissipation of the electronic component will be slow, resulting in a reduction in the service life of the electronic component. Most of the existing heat sinks are in the form of parallel sheets. For example, an aluminum alloy heat sink disclosed in a Chinese utility model patent with the patent application number CN202023024594.X includes a heat dissipation bottom plate, side plates and aluminum alloy heat dissipation fins. The side plates are fixedly connected to the heat dissipation bottom plate, and the bottom ends of the side plates are fixedly connected to the upper surface of the heat dissipation bottom plate. Side plates are provided at both ends of the upper surface of the heat dissipation bottom plate, and aluminum alloy heat dissipation fins are provided between the side plates. In this structure, the aluminum alloy heat dissipation fins are arranged at high and low intervals by adjusting the height of the heat dissipation fins, so as to accelerate the heat dissipation speed of heat-generating electronic components. However, in the air flow channels formed by the evenly spaced heat dissipation fins, the air flow velocity is gentle and cannot quickly take away the heat. Therefore, the efficiency of the air flow in taking away the heat is poor, and the heat dissipation efficiency still needs to be improved. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the present utility model provides an aluminum alloy heat sink.

[0005] The technical solution adopted by the present utility model to solve its technical problems is:

[0006] The aluminum alloy heat sink includes a base, a connecting column, a plurality of heat dissipation fins and a wind shield. The base is horizontally arranged. The bottom end of the connecting column is connected to the base and extends in the vertical direction. The bottom edge of the heat dissipation fin is connected to the base. The inner edge of the heat dissipation fin spirally extends from the lower part to the upper part along the outer side surface of the connecting column to the top. A plurality of the heat dissipation fins are evenly spaced around the axis of the connecting column. The wind shield covers the outside of the plurality of heat dissipation fins. An air flow channel is formed between adjacent two heat dissipation fins. The outer side edge of the heat dissipation fin expands in an arc from bottom to top, so that the air flow channel forms a structure that is wider at the top and narrower at the bottom. The wind shield covers the arc-expanded part of the upper part of the heat dissipation fin. The part of the lower part of the heat dissipation fin that is not covered is set as an air outlet.

[0007] In the present utility model, the inner contour of the wind shield corresponds to the contour formed by the arc expansion parts of a plurality of heat dissipation fins, and the base, the connecting column and the heat dissipation fins are integrally formed of aluminum alloy material.

[0008] In the present utility model, a plurality of the heat dissipation fins are arc-bent to one side to form a vortex structure.

[0009] In the present utility model, an arc surface is provided between the bottom of the connecting column and the base, and after the air flows through the air flow channel, the air is guided to the air outlet through the arc surface at the bottom.

[0010] In the present utility model, the slot holes provided inside the connecting column make the connecting column form a hollow structure, and the bottom of the slot holes communicates with the outside.

[0011] Furthermore, a heat conduction block is provided at the bottom of the base. The heat conduction block includes a heat conduction sheet and a heat conduction column which are integrally formed. The heat conduction sheet is attached to the bottom surface of the base, and the heat conduction column is inserted into the slot hole of the connecting column and is attached to the inner wall of the slot hole.

[0012] In the present utility model, a cover plate is provided at the top of the wind shield. The cover plate is of an annular structure. The inner edge of the cover plate abuts against the outer ends of the top edges of a plurality of heat dissipation fins, and the outer edge of the cover plate is fixed on the wind shield.

[0013] Furthermore, a fan is installed on the cover plate, and the fan blows the outside air into the air flow channel.

[0014] The present utility model has the following advantages and beneficial effects:

[0015] An air flow channel with a wider upper part and a narrower lower part is formed by the heat dissipation fins. When the air enters from the large opening at the upper part and exits from the small opening, due to the fast flow rate and low pressure, although the time for the heat exchange between the air and the surrounding environment is short, since the heat exchange occurs throughout the entire flow process and the air is fully compressed and accelerated before flowing out, more heat can be carried away, thus improving the heat dissipation efficiency; moreover, by spirally extending the inner edge of the heat dissipation fins along the connecting column, the length of the air flow channel can be extended, enabling the air to have a longer time for heat exchange with the heat dissipation fins and further improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0017] Figure 1 It is a schematic structural view of the heat dissipation fins in this embodiment;

[0018] Figure 2 It is a sectional view of the heat dissipation fins in this embodiment;

[0019] Figure 3 Schematic diagram of the installation of the heat-conducting block in this embodiment;

[0020] Figure 4 Schematic diagram of the installation of the fan in this embodiment. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The present utility model is not limited to the following embodiments.

[0022] As Figures 1 to 4 shown, this embodiment discloses an aluminum alloy heat sink, which includes a base 1, a connecting column 2, a plurality of heat dissipation fins 3 and a wind shield 4. The base 1 is a horizontally arranged circular sheet structure. The bottom end of the connecting column 2 is connected to the center of the base 1 and extends in the vertical direction. The bottom edges of the plurality of heat dissipation fins 3 are connected to the base 1. The inner side edges of the heat dissipation fins 3 spiral upward from the lower part along the outer side surface of the connecting column 2 to the top. The plurality of heat dissipation fins 3 are evenly spaced around the axis of the connecting column 2. The wind shield 4 covers the outside of the plurality of heat dissipation fins 3 to form an air flow channel 5 between adjacent two heat dissipation fins 3. Specifically, the outer side edges of the heat dissipation fins 3 expand in an arc from bottom to top so that the air flow channel 5 forms a structure with a wider upper part and a narrower lower part. The wind shield 4 covers the arc-expanded part at the upper part of the heat dissipation fins 3. The part of the lower part of the heat dissipation fins 3 that is not covered by the wind shield 4 is set as an air outlet 51. It can be determined that the inner contour of the wind shield 4 corresponds to the contour formed by the arc-expanded parts of the plurality of heat dissipation fins 3. In order to improve the heat conduction efficiency, the base 1, the connecting column 2 and the heat dissipation fins 3 are all integrally formed of aluminum alloy material.

[0023] In this embodiment, the heat dissipation principle of the heat sink is as follows: Through the air flow channel 5 with a wider upper part and a narrower lower part, when air enters from the large opening at the upper part, the flow rate is relatively slow. However, due to the large diameter, the contact area between the air and the surrounding environment is also large. Therefore, there are more opportunities for heat exchange from the very beginning. As the air flows in the air flow channel 5, the flow rate gradually increases. Especially when approaching the small opening at the bottom, according to Bernoulli's principle, the pressure is low where the flow rate is fast. Therefore, the pressure at the small opening will be further reduced. This pressure difference will accelerate the air flow and cause the air to continuously exchange heat with the surrounding environment during the flow. When the air is discharged from the small opening, due to the fast flow rate and low pressure, although the time for heat exchange between the air and the surrounding environment is short, since heat exchange occurs throughout the entire flow process and the air is fully compressed and accelerated before flowing out, more heat can be carried away, thereby improving the heat dissipation efficiency. Moreover, by spirally extending the connecting column 2 on the inner edge of the heat dissipation fin 3, the length of the air flow channel 5 can be extended, allowing more time for heat exchange between the air and the heat dissipation fin 3, and further improving the heat dissipation effect.

[0024] Furthermore, several of the heat dissipation fins 3 are bent in an arc shape towards one side to form a vortex structure. By increasing the cross-sectional area of the air flow channel 5, the contact area between the air and the heat dissipation fins 3 is larger, and the heat dissipation effect is better.

[0025] In this embodiment, since the direction of the air outlet 51 is perpendicular to the direction of the air flow channel 5, in order to prevent the air from forming a turbulent flow at the air outlet 51 after flowing through the heat dissipation fins 3, a circular arc surface 52 is provided between the bottom of the connecting column 2 and the base 1 for transition. After flowing through the air flow channel 5, the air is guided to the air outlet 51 through the circular arc surface 52 at the bottom.

[0026] In this embodiment, the bottom surface of the base 1 is in contact with the component that needs to be cooled. Most of the heat will be transferred from the base 1 to the connecting column 2, and then from the connecting column 2 to the heat dissipation fins 3. During this process, due to the relatively large cross-sectional area of the connecting column 2, the efficiency of heat conduction is reduced. Therefore, a slot hole 20 with a bottom communicating with the outside is provided inside the connecting column 2. It can be determined that the connecting column 2 is a hollow structure. The hollow connecting column 2 can transfer the heat on the base 1 to the heat dissipation fins 3 more quickly, thereby quickly dissipating the heat.

[0027] Further, in order to further improve the heat conduction efficiency between the base 1 and the connecting column 2, a heat conduction block 6 is provided at the bottom of the base 1. The heat conduction block 6 includes an integrally formed heat conduction sheet 61 and a heat conduction column 62. The heat conduction sheet 61 is attached to the bottom surface of the base 1, and the heat conduction column 62 is inserted into the slot hole 20 of the connecting column 2 and fits against the inner wall of the slot hole 20. Specifically, the heat conduction block 6 is attached to the base 1 and the connecting column 2 through heat conduction silicone grease. It should be noted that the heat conduction efficiency of the heat conduction block 6 is greater than that of aluminum alloy, and the material is preferably copper. Through the heat conduction block 6, heat can be transferred to the connecting column 2 more quickly. Considering the production cost, the heat conduction block 6 can be applied according to the actual situation.

[0028] In this embodiment, in order to facilitate the installation of the windshield 4, a cover plate 41 is provided at the top of the windshield 4. The cover plate 41 is a ring-shaped structure. The inner edge of the cover plate 41 abuts against the outer ends of the top edges of several heat dissipation fins 3, and the outer edge of the cover plate 41 is fixed to the windshield 4. Through the cover plate 41, the windshield 4 is axially limited outside the heat dissipation fins 3. Specifically, a fan 7 can be installed on the cover plate 41, and the fan 7 blows the outside air into the air flow channel 5.

[0029] What is described above in this specification is only an example of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the content of this specification of the present invention or exceed the scope defined by this claims, they should all belong to the protection scope of the present invention.

Claims

1. Aluminum alloy heat sink, characterized by: The invention comprises a base (1), a connecting column (2), a plurality of heat dissipation fins (3) and a wind shield (4), wherein the base (1) is arranged horizontally, the bottom end of the connecting column (2) is connected to the base (1) and extends in a vertical direction, the bottom edge of the heat dissipation fin (3) is connected to the base (1), the inner side edge of the heat dissipation fin (3) spirally extends from bottom to top along the outer side surface of the connecting column (2), the plurality of heat dissipation fins (3) are evenly spaced around the axis of the connecting column (2), the wind shield (4) is arranged on the outer side of the plurality of heat dissipation fins (3), an air flow channel (5) is formed between two adjacent heat dissipation fins (3), the outer side edge of the heat dissipation fin (3) is expanded in an arc from bottom to top so that the air flow channel (5) forms a structure with a width at the top and a narrowness at the bottom, the wind shield (4) is arranged on the expanded arc portion of the upper part of the heat dissipation fin (3), and the lower part of the heat dissipation fin (3) that is not covered is set as an air outlet (51).

2. The aluminum alloy heat sink according to claim 1, characterized in that: The inner profile of the wind shield (4) corresponds to the profile formed by the arc expansion portions of the plurality of heat dissipation fins (3), and the base (1), the connecting column (2) and the heat dissipation fins (3) are all integrally formed using an aluminum alloy material.

3. The aluminum alloy heat sink according to claim 1, characterized in that: A plurality of the heat dissipation fins (3) are bent in an arc toward one side to form a spiral structure.

4. The aluminum alloy heat sink according to claim 1, characterized in that: A circular arc surface (52) is provided between the bottom of the connecting column (2) and the base (1); after the air flows through the air flow channel (5), the air is guided to the air outlet (51) through the circular arc surface (52) at the bottom.

5. The aluminum alloy heat sink according to claim 1, characterized in that: The slot hole (20) provided inside the connecting column (2) enables the connecting column (2) to form a hollow structure, and the bottom of the slot hole (20) is connected to the outside.

6. The aluminum alloy heat sink according to claim 5, characterized in that: A heat conducting block (6) is provided at the bottom of the base (1), the heat conducting block (6) comprising an integrally formed heat conducting sheet (61) and a heat conducting column (62), the heat conducting sheet (61) being attached to the bottom surface of the base (1), and the heat conducting column (62) being inserted into the slot (20) of the connecting column (2) and being attached to the inner wall of the slot (20).

7. The aluminum alloy heat sink according to claim 1, characterized in that: A cover plate (41) is provided on the top of the wind shield (4), the cover plate (41) being an annular structure, the inner edge of the cover plate (41) abutting against the outer ends of the top edges of a plurality of heat dissipation fins (3), and the outer edge of the cover plate (41) being fixed on the wind shield (4).

8. The aluminum alloy heat sink according to claim 7, characterized in that: A fan (7) is installed on the cover plate (41), and the fan (7) blows external air into the air flow channel (5).

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