CN210579870U

CN210579870U - heat sink

Info

Publication number: CN210579870U
Application number: CN201921604262.3U
Authority: CN
Inventors: 林星晨; 邱英哲
Original assignee: Asustek Computer Inc
Current assignee: Asustek Computer Inc
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-05-19
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses a heat dissipation device, comprising a centrifugal fan and a first heat dissipation fin group. The centrifugal fan comprises a fan frame. The fan frame has a first opening and a first tongue. The first opening has a first side and a second side opposite to each other. The first tongue is adjacent to the first side and away from the second side. The first heat dissipation fin group is adjacent to the first opening. The first heat dissipation fin group comprises a first fin, a second fin and a third fin. The first fin, the second fin and the third fin are arranged in sequence from the second side to the first side. The second fin and the third fin each comprise a main body and a bending portion. The bending portion is connected to the main body and is bent toward the second side relative to the main body. The bending angle of the bending portion of the second fin relative to the main body is smaller than the bending angle of the bending portion of the third fin relative to the main body. Thus, the heat dissipation device of the utility model can reduce the impact generated when the airflow enters the heat dissipation fins, thereby improving the heat dissipation capacity of the heat dissipation device.

Description

Heat sink device

Technical Field

The utility model relates to a heat abstractor.

Background

Generally, in order to prevent the electronic components inside the computer host from being overheated and causing abnormality of the electronic components, a heat dissipation device is usually disposed on the electronic components, such as a power supply, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), and the like of the computer host, which are easily heated to dissipate heat generated during the operation of the electronic components.

In the existing heat dissipation device, a fan is used in conjunction with heat dissipation fins as a heat dissipation mechanism of an electronic product. However, the airflow generated by the fan operation has a specific uneven airflow speed and airflow direction. When these airflows with different speeds and directions enter the heat dissipation fins, they will collide with the heat dissipation fins to generate noise. Moreover, the flowing direction of the airflow cannot be matched with the arrangement direction of the heat dissipation fins, so that the airflow cannot smoothly flow into the heat dissipation fins, and the heat dissipation efficiency of the heat dissipation fins is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a heat abstractor can reduce the impact that produces when the air current gets into heat radiation fins, and then improves heat abstractor's heat-sinking capability.

The utility model provides a heat abstractor contains centrifugal fan and first cooling fin group. The centrifugal fan comprises a fan frame. The fan frame is provided with a first opening and a first tongue portion. The first opening is provided with a first side edge and a second side edge which are opposite. The first tongue is adjacent the first side edge and distal the second side edge. The first heat radiating fin group is adjacent to the first opening. The first heat dissipation fin group comprises a first fin, a second fin and a third fin. The first fin, the second fin and the third fin are sequentially arranged from the second side edge to the first side edge. The second fin and the third fin each include a body portion and a bending portion. The bending part is connected with the main body part and bends towards the second side edge relative to the main body part. The bending angle of the bending part of the second fin relative to the body part is smaller than that of the bending part of the third fin relative to the body part.

In one or more embodiments, the bent portion of at least one of the second fin and the third fin has a straight section connected to the body portion.

In one or more embodiments, the bent portion of at least one of the second fin and the third fin further has an arc-shaped section, and the arc-shaped section is connected between the body portion and the straight section.

In one or more embodiments, the bent portion of at least one of the second fin and the third fin has a plurality of straight sections, and the straight sections are sequentially connected from one end of the main body portion close to the first opening.

In one or more embodiments, a straight section of the plurality of straight sections that is distal from the body portion is inclined relative to the body portion toward the second side edge than a straight section that is proximal to the body portion.

In one or more embodiments, the plurality of body portions of the second fin and the third fin extend away from the first opening, and the plurality of bent portions of the second fin and the third fin are respectively connected to one end of the corresponding plurality of body portions, which is close to the first opening.

In one or more embodiments, at least one of the second fin and the third fin further includes at least one extending portion connected to a side of the main portion close to the first opening, the at least one extending portion extends toward the first opening in parallel with the main portion along the first direction, and the at least one extending portion and the corresponding bending portion are arranged side by side at the side close to the first opening.

In one or more embodiments, the number of the at least one extending portion is two, and the bending portion is located between the two extending portions.

In one or more embodiments, the bent portion of at least one of the second fin and the third fin has an arc-shaped section connected to the body portion.

In one or more embodiments, the fan frame further has a second opening and a second tongue, the second opening has a third side and a fourth side opposite to each other, the third side is adjacent to the second side and is far away from the first side, the second tongue is adjacent to the second side and the third side and is far away from the fourth side, and the heat dissipation device further includes: a second set of heat sink fins adjacent to the second opening, comprising: a fourth fin and a fifth fin; the fourth fin and the fifth fin are sequentially arranged from the fourth side edge to the third side edge, the fifth fin is provided with a body part and a bent part, and the bent part of the fifth fin is connected with one end, close to the second opening, of the body part of the fifth fin and is bent towards the fourth side edge relative to the body part.

To sum up, the heat dissipation device of the present invention, according to the flowing direction of the air flow blown by the fan, in the heat dissipation fin set, the plurality of heat dissipation fins near the tongue opening of the fan are designed with the bending part structures to guide the air flow to smoothly flow into the heat dissipation fins. Therefore, the impact generated when the airflow enters the radiating fins can be reduced, the flow of the airflow entering the radiating fins is improved, and the radiating capacity of the radiating device is improved. In addition, the noise generated by the collision of the airflow and the heat dissipation fins can be reduced.

The above description is only for the purpose of illustrating the problems to be solved, the technical means for solving the problems, the efficacy of the invention, and the like, and the details of the invention will be described in detail in the following embodiments and the related drawings. The present invention is further illustrated by the following embodiments and the accompanying drawings.

Drawings

Fig. 1 is a perspective view of a heat dissipation device according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the heat sink of fig. 1 taken along line 2-2.

Fig. 3 is a partial schematic view of the second fin of fig. 2.

Fig. 4 is a partial schematic view of a fin according to an embodiment of the present invention, in which a bent portion of the fin has an arc-shaped section and a straight section.

Fig. 5 is a partial schematic view of a fin according to an embodiment of the present invention, wherein a bending portion of the fin has a plurality of straight sections.

Fig. 6 is a partial schematic view of a fin according to an embodiment of the present invention, wherein a bent portion of the fin has an arc-shaped section.

Fig. 7 is a side view of the second fin of fig. 2.

Fig. 8 is a side view of a fin of an embodiment of the present invention, wherein the fin further includes an extension.

Fig. 9 is a side view of a fin of an embodiment of the present invention, wherein the number of extensions is two.

Fig. 10 is a cross-sectional view of a heat dissipation device according to an embodiment of the present invention, wherein a fan frame of the heat dissipation device has two openings.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and elements are shown in simplified schematic form in the drawings.

Please refer to fig. 1. Fig. 1 is a perspective view of a heat dissipation device 100 according to an embodiment of the present invention. As shown in fig. 1, the heat dissipation apparatus 100 of the present embodiment is suitable for use in an electronic device to dissipate heat of electronic components in the electronic device, so as to avoid the damage of the electronic components caused by an over-high temperature during operation.

The heat dissipation device 100 includes a centrifugal fan 110 and a heat dissipation fin set 120. The centrifugal fan 110 includes a fan frame 112, a top plate 114, a bottom plate 116 and fan blades 118. The top plate 114 has an intake port 1141. The fan blade 118 is disposed corresponding to the air inlet 1141, that is, the fan blade 118 is exposed through the air inlet 1141. The fan frame 112 connects the top plate 114 and the bottom plate 116. The fan frame 112 has an opening 1121 and a tongue 1122. The opening 1121 has a first side 1121a and a second side 1121b opposite to each other. The tongue 1122 is adjacent the first side 1121a and away from the second side 1121 b. Fin set 120 is disposed adjacent to opening 1121.

When the fan blade 118 is operating, negative pressure is generated at the air inlet 1141, so that air around the air inlet 1141 is sucked into the fan frame 112 through the air inlet 1141, and is blown toward the heat dissipation fin set 120 through the opening 1121 to cool the heat dissipation fin set 120.

Please refer to fig. 2. Fig. 2 is a cross-sectional view of the heat dissipation device 100 of fig. 1 along line 2-2. As shown in fig. 2, the heat sink fin set 120 includes a plurality of heat sink fins. A plurality of heat dissipation fins are arranged along the opening 1121. The plurality of heat dissipation fins can be roughly divided into a first fin group, a second fin group and a third fin group. Each fin group comprises one or more fins. Since the fins in the same group have the same configuration, only one first fin 122a, one second fin 122b, and one third fin 122c in the first fin group, the second fin group, and the third fin group will be described as an example. The first fins 122a, the second fins 122b, and the third fins 122c are sequentially arranged from the second side 1121b of the opening 1121 to the first side 1121a of the opening 1121. The first fin 122a, the second fin 122b, and the third fin 122c include body portions 1a1, 1b1, and 1c1, respectively. The body portions 1a1, 1b1, 1c1 extend away from the opening 1121. Further, the second fin 122b and the third fin 122c further include bent portions 1b2 and 1c2, respectively. The bent portions 1b2 and 1c2 are connected to the ends of the main portions 1b1 and 1c1 close to the opening 1121, and are bent toward the second side 1121b relative to the main portions 1b1 and 1c1, wherein the bent angle of the bent portion 1b2 of the second fin 122b relative to the main portion 1b1 is smaller than the bent angle of the bent portion 1c2 of the third fin 122c relative to the main portion 1c 1.

In some embodiments, the bent portions 1b2 and 1c2 of the second fin 122b and the third fin 122c are bent by about 15 degrees to 30 degrees relative to the body portions 1b1 and 1c1, respectively, but the invention should not be limited thereto.

As fan blades 118 rotate, the resulting airflow is directed as shown in FIG. 2. Near the second side 1121b, the fan frame 112 has a straight section 112 a. The air flow is affected by the straight section 112a of the fan frame 112, and the air flow direction is substantially parallel to the extending direction of the straight section 112 a. Near the first side 1121a, the airflow is influenced by the tongue portion 1122, and the airflow gradually deviates to incline relative to the straight section 112a of the fan frame 112, and the farther away from the second side 1121b, the inclination angle of the airflow is larger. The airflow channels between the first fins 122a of the first fin group are substantially parallel to the airflow flowing direction. Therefore, the airflow can smoothly flow into the airflow channel between the first fins 122a without colliding with the first fins 122 a. Compared to the first fins 122a far from the second side 1121b, the second fins 122b and the third fins 122c have an increased inclination angle of the airflow.

In the prior art, the airflow collides with the fins to generate noise, and the fins also form airflow resistance, so that the airflow cannot smoothly flow through the airflow channel between the fins. However, the bent portions 1b2 and 1c2 of the second fin 122b and the third fin 122c are bent toward the second side 1121b with respect to the body portions 1b1 and 1c1, respectively. Through the guidance of the bent portions 1b2 and 1c2, the airflow can rapidly flow into the airflow channels formed by the second fins 122b and the third fins 122c in the second fin group and the third fin group. Further, the bending angle of the bent portion 1c2 of the third fin 122c relative to the main body portion 1c1 is larger than the bending angle of the bent portion 1b2 of the second fin 122b relative to the main body portion 1b1, according to the inclination angle of the airflow. Therefore, noise generated by impact between the airflow and the second fin group and between the airflow and the third fin group can be reduced, energy loss caused by collision between the airflow and the second fin group and the third fin can be avoided, and flow resistance of the second fin group and the third fin group is reduced.

With the above structure configuration, by the design of the bent portions 1b2 and 1c2, the airflow generated by the fan blade 118 can be guided by the bent portions 1b2 and 1c2, so as to avoid the noise, eddy and energy loss caused by the direct collision between the airflow and the fins. In addition, the surface speed of the airflow flowing through the fins and the contact area of the airflow and the fins can be improved, and further the heat exchange and heat dissipation efficiency is improved.

Please refer to fig. 3 to 6. Fig. 3 is a partial schematic view of the second fins 122b in fig. 2. Fig. 4 is a partial schematic view of a fin according to an embodiment of the present invention, in which a bent portion 2b2 of the fin has an arc-shaped section 2b22 and a straight section 2b 21. Fig. 5 is a partial schematic view of a fin according to an embodiment of the present invention, in which a bent portion 3b2 of the fin has a plurality of straight sections 3b21a and 3b21 b. Fig. 6 is a partial schematic view of a fin according to an embodiment of the present invention, wherein a bent portion 4b2 of the fin has an arc-shaped section 4b 22.

The second fin 122b is taken as an example to illustrate the fin configurations of various embodiments of the present invention, however, these fin configurations can also be applied to the third fin 122c, and the present invention should not be limited thereto.

As shown in fig. 3, in the present embodiment, the bent portion 1b2 has a straight section 1b 21. The straight section 1b21 is connected to the main body 1b1 and is bent at an angle A1 with respect to the main body 1b 1. In some embodiments, the angle a1 is about 15 degrees to about 30 degrees, but the present invention should not be limited thereto.

As shown in fig. 4, in the present embodiment, the second fin 222b includes a body portion 1b1 and a bent portion 2b2, wherein the body portion 1b1 is the same as the embodiment shown in fig. 1 to 3, so that reference can be made to the related description, which is not repeated herein. The difference between the present embodiment and the embodiment of fig. 1 to 3 lies in that the bent portion 2b2 of the present embodiment further has an arcuate section 2b 22. The arc-shaped section 2b22 is connected between the body portion 1b1 and the straight section 2b 21.

As shown in fig. 5, in the present embodiment, the second fin 322b includes a body portion 1b1 and a bent portion 3b2, wherein the body portion 1b1 is the same as the embodiment shown in fig. 1 to 3, so that reference can be made to the related description, which is not repeated herein. The difference between the present embodiment and the embodiment of fig. 1 to 3 lies in that the bent portion 3b2 of the present embodiment has two straight sections 3b21a and 3b21 b. The two straight sections 3b21a, 3b21b are connected in sequence from the end of the main body 1b1 near the opening 1121. The straight section 3b21b is farther from the body portion 1b1 than the straight section 3b21a, and the straight section 3b21b is inclined toward the second side 1121b than the straight section 3b21a (please refer to fig. 2).

In some embodiments, the number of straight sections may be two or more, and the present invention should not be limited thereto.

As shown in fig. 6, in the present embodiment, the second fin 422b includes a body portion 1b1 and a bent portion 4b2, wherein the body portion 1b1 is the same as the embodiment shown in fig. 1 to 3, so that reference can be made to the related description, which is not repeated herein. The difference between the present embodiment and the embodiment of fig. 1 to 3 is that the bent portion 4b2 of the present embodiment has only the arcuate segment 4b 22. The arc-shaped segment 4b22 is connected to the main body 1b1, and bends and extends relative to the main body 1b1 toward the second side 1121b relative to the main body 1b1 (please refer to fig. 2).

Please refer to fig. 7 to 9. Fig. 7 is a side view of the second fins 122b of fig. 2. Fig. 8 is a side view of another embodiment of the fin of the present invention, wherein the fin further comprises an extension 5b 3. Fig. 9 is a side view of a fin according to another embodiment of the present invention, in which the number of the extension portions 6b31, 6b32 is two.

The second fin 122b is taken as an example to illustrate the fin configurations of various embodiments of the present invention, however, these fin configurations are also applicable to the third fin 122c, and the present invention should not be limited thereto.

As shown in fig. 7, the body portion 1b1 extends in the first direction D1. The bent portion 1b2 is connected to one end of the main body portion 1b1 and extends along the second direction D2 to connect to the whole side 1b11 of the main body portion 1b1, wherein the first direction D1 is substantially perpendicular to the second direction D2.

As shown in fig. 8, in the present embodiment, the second fin 522b includes a body portion 1b1, a bent portion 5b2 and an extending portion 5b3, wherein the body portion 1b1 is the same as the embodiment shown in fig. 7, so that reference can be made to the above description, and further description is omitted here. The difference between this embodiment and the embodiment of fig. 7 is that the second fin 522b of this embodiment further includes an extension 5b 3. The extension portion 5b3 is connected to an end of the main body portion 1b1 near the opening 1121. The extending portion 5b3 extends parallel to the main body portion 1b1 toward the opening 1121 along the first direction D1 (please refer to fig. 2). The extending portion 5b3 and the bent portion 5b2 are arranged side by side on the side 1b11 of the main body portion 1b1 close to the opening 1121 along the second direction D2. In other words, the bent portion 5b2 extends at least partially along the side 1b11 of the main body 1b 1.

As shown in fig. 9, in the present embodiment, the second fin 622b includes a main portion 1b1, a bent portion 6b2, and two extending portions 6b31 and 6b32, wherein the main portion 1b1 is the same as the embodiment shown in fig. 7, and therefore, reference can be made to the related description, which is not repeated herein. The present embodiment differs from the embodiment of fig. 7 in that the number of the extending portions 6b31, 6b32 of the present embodiment is two. Two extending portions 6b31, 6b32 are connected to one end of the main body portion 1b1 near the opening 1121. The two extending portions 6b31, 6b32 extend parallel to the main body portion 1b1 toward the opening 1121 along the first direction D1 (please refer to fig. 2). The two extending portions 6b31, 6b32 and the bent portion 6b2 are arranged side by side along the second direction D2, and the bent portion 6b2 is located between the two extending portions 6b31, 6b 32.

In some embodiments, the extending height of the bent portions 5b2 and 6b2 in the second direction D2 is at least about 40% of the height of the body portion 1b1 in the second direction D2, but the invention should not be limited thereto.

Please refer to fig. 10. Fig. 10 is a cross-sectional view of a heat dissipating device 700 according to another embodiment of the present invention, wherein a fan frame 712 of the heat dissipating device 700 has two openings 1121, 7121'.

As shown in fig. 10, in the present embodiment, the heat dissipation device 700 includes a centrifugal fan 710 and two heat dissipation fin sets 120 and 720'. The centrifugal fan 710 includes a fan frame 712, a top plate 114 (not shown), a bottom plate 116 and fan blades 118, wherein the top plate 114, the bottom plate 116, the fan blades 118 and the heat dissipation fin set 120 are the same as those of the embodiment shown in fig. 1 and 2, and therefore, reference may be made to the related description, which is not repeated herein. The difference between this embodiment and the embodiment of fig. 1 and 2 is that the fan frame 712 further includes a second opening 7121 'and a second tongue portion 7122'. The two openings 1121, 7121' are substantially vertical, but the invention should not be limited thereto.

Similar to the first opening 1121, the second opening 7121 ' has a third side 7121 ' a and a fourth side 7121 ' b opposite to each other. Third side 7121' a is adjacent to second side 1121b and is distal to first side 1121 a. Second tongue 7122 ' is adjacent to second side 1121b and third side 7121 ' a, and is distal to fourth side 7121 ' b. Specifically, as shown in fig. 10, when viewed in the counterclockwise direction, the fan frame 712 is composed of a first opening 1121, a first side 1121a, a first tongue portion 1122, a fourth side 7121 'b, a second opening 7121', a third side 7121 'a, a second tongue portion 7122', and a second side 1121b in sequence.

The set of fins 720 'is disposed adjacent to the second opening 7121'. The heat sink set 720' includes a plurality of heat sinks. A plurality of heat dissipation fins are arranged along the second opening 7121'. The plurality of heat dissipation fins can be roughly divided into a fourth fin group and a fifth fin group. Each fin group comprises one or more fins. Since the fins in the same group have the same or similar configurations, only one fourth fin 722a and one fifth fin 722b in the fourth fin group and the fifth fin group will be described as an example. The fourth fin 722a and the fifth fin 722b are sequentially arranged from the fourth side 7121 'b of the second opening 7121' to the third side 7121 'a of the second opening 7121'. The fourth fin 722a and the fifth fin 722b include body portions 7a1 and 7b1, respectively. The body portions 7a1, 7b1 extend away from the second opening 7121'. Further, the fifth fins 722b further include bent portions 7b2, respectively. The bent portion 7b2 is connected to the end of the main body portion 7b1 close to the second opening 7121 ', and is bent toward the fourth side 7121 ' b relative to the main body portion 7b1, and the bending angle of the bent portion 7b2 relative to the main body portion 7b1 is larger the closer to the fifth fin 722b of the second tongue portion 7122 '.

When fan blades 118 are operating, the direction of the airflow generated is as shown in FIG. 10. The fan frame 712 has

straight sections

112a and 712b near the second side 1121b and the fourth side 7121' b, respectively. The air flow is affected by the

straight sections

112a, 712b of the fan frame 712, and the air flow direction is substantially parallel to the extending direction of the

straight sections

112a, 712 b. However, near the first side 1121a and the third side 7121 ' a, the airflow is influenced by the first tongue portion 1122 and the second tongue portion 7122 ', the airflow gradually deviates to incline relative to the

straight portions

112a and 712b, and the farther away from the second side 1121b or the fourth side 7121 ' b, the more the inclination angle of the airflow is increased.

By designing the bent portions of the fins in the two sets of heat dissipating fins 120, 720 ', the air flow inclined relative to the

straight portions

112a, 712b under the influence of the first tongue portion 1122 and the second tongue portion 7122' can be guided by the bent portions, thereby preventing the air flow from directly colliding with the fins to generate noise, vortex and energy loss. In addition, the surface speed of the airflow flowing through the fins and the contact area of the airflow and the fins can be improved, and further the heat exchange and heat dissipation efficiency is improved.

By the above to the detailed description of the specific embodiments of the present invention, it can be obviously seen that the heat dissipation device of the present invention designs the bending part structure of the plurality of heat dissipation fins near the tongue opening of the fan according to the flowing direction of the air flow blown by the fan in the heat dissipation fin group to guide the air flow to smoothly flow into the heat dissipation fins. Therefore, the impact generated when the airflow enters the radiating fins can be reduced, the flow of the airflow entering the radiating fins is improved, and the radiating capacity of the radiating device is improved. In addition, the noise generated by the collision of the airflow and the heat dissipation fins can be reduced.

Although the present invention has been described with reference to the above embodiments, it is not intended to limit the present invention, and those skilled in the art can make modifications and decorations without departing from the spirit and scope of the present invention.

Claims

1. A heat sink, characterized in that, comprising:

The centrifugal fan includes a fan frame, the fan frame has a first opening and a first tongue, the first opening has opposite first sides and a second side, the first tongue is adjacent to the first tongue one side and away from the second side; and

The first set of heat dissipation fins is adjacent to the first opening and includes:

the first fin;

the second fin; and

the third fin;

Wherein, the first fin, the second fin and the third fin are sequentially arranged from the second side to the first side;

Wherein, each of the second fin and the third fin includes a body portion and a bending portion, and the bending portion is connected to the body portion and is bent toward the second side relative to the body portion , and the bending angle of the bending portion of the second fin relative to the body portion is smaller than the bending angle of the bending portion of the third fin relative to the body portion.

2 . The heat dissipation device of claim 1 , wherein the bent portion of at least one of the second fin and the third fin has a straight section connected to the body portion. 3 . .

3 . The heat dissipation device according to claim 2 , wherein the bent portion of at least one of the second fin and the third fin further has an arc-shaped segment, and the arc A shaped segment is connected between the body portion and the straight segment.

4 . The heat dissipation device of claim 1 , wherein the bent portion of at least one of the second fin and the third fin has a plurality of straight sections, and the plurality of The straight sections are sequentially connected from one end of the body portion close to the first opening.

5 . The heat dissipation device according to claim 4 , wherein, among the plurality of straight sections, the straight section far from the main body portion is larger than the straight section close to the main body portion, which is opposite to the main body portion. 6 . Inclined towards the second side.

6 . The heat dissipation device of claim 1 , wherein the body portions of the second fin and the third fin extend away from the first opening, and the second fin extends away from the first opening. 7 . Each of the plurality of bent portions of the third fin is connected to one end of the corresponding plurality of body portions that is close to the first opening.

7 . The heat dissipation device of claim 1 , wherein at least one of the second fin and the third fin further comprises at least one extension portion, the at least one extension portion is connected to the heat sink. 8 . The body portion is connected to one side of the first opening, the at least one extension portion extends parallel to the body portion toward the first opening along the first direction, and the at least one extension portion is connected to the corresponding bend. The folds are side by side on the side adjacent to the first opening.

8 . The heat dissipation device of claim 7 , wherein the number of the at least one extension portion is two, and the bent portion is located between the two extension portions. 9 .

9 . The heat dissipation device of claim 1 , wherein the bent portion of at least one of the second fin and the third fin has an arc-shaped section and the body portion. 10 . connect.

10 . The heat dissipation device of claim 1 , wherein the fan frame further has a second opening and a second tongue, the second opening has an opposite third side and a fourth side, and the 10 . The third side is adjacent to the second side and away from the first side, and the second tongue is adjacent to the second side and the third side and away from the fourth side side, the heat dissipation device further includes:

The second set of heat dissipation fins is adjacent to the second opening and includes:

the fourth fin; and

A fifth fin, wherein the fourth fin and the fifth fin are sequentially arranged from the fourth side to the third side, and the fifth fin has a body portion and a bend the bending part of the fifth fin is connected to the end of the body part of the fifth fin close to the second opening, and is bent toward the fourth side relative to the body part fold.