Low-boiling-point radiator
By adopting a heat pipe design with a non-circular cross-section in the low-boiling-point radiator, a closed circulation loop is formed, which solves the problems of limited heat dissipation efficiency and evaporation-condensation interference in the existing technology and achieves a more efficient heat dissipation effect.
Patent Information
- Application Number
- CN202422953930.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The heat dissipation performance of existing vapor chambers and radiators is limited by their area and volume. The heat dissipation efficiency of heat pipes is also limited. In addition, the vapor chambers and heat pipes easily interfere with each other during evaporation and condensation, affecting the heat dissipation effect.
A low-boiling-point radiator is designed, which uses heat pipes with non-circular cross-sections in the evaporation channel and the return channel to form a closed internal circulation loop, avoid mutual interference during evaporation and condensation, and increase liquid flow and flow rate.
The heat dissipation effect of the radiator is improved. The design of the non-circular channel avoids mutual interference during evaporation and condensation, enhances the circulation of the liquid, and improves the heat dissipation efficiency.
Smart Images
Figure CN223463240U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of heat dissipation, in particular to a low-boiling heat sink. BACKGROUND
[0002] With the vigorous development of electronic technology, various electronic devices gradually develop towards high performance and thinness, so as to meet the diversified needs of users. However, while various electronic components improve performance and thinness, they greatly increase the heat generated during operation, so it is necessary to greatly improve the heat dissipation performance in limited space to ensure stability and service life during use. The common way is to use vapor chamber, heat sink, heat pipe or their combination to dissipate heat from the heat source of each electronic component.
[0003] However, the heat dissipation performance of the vapor chamber and the heat sink is mainly limited by the area and volume size, so the heat dissipation effect that can be improved is limited. In addition, the vapor chamber and the circular pipe achieve cooling effect through the phase change of the liquid inside when heated and cooled, but since the gas or liquid inside is in the same chamber or space, there is mutual interference during evaporation or condensation, which affects the heat dissipation effect. SUMMARY
[0004] The main purpose of the utility model is to provide a low-boiling heat sink, which can make the working liquid form a circulation loop without mutual interference during evaporation and condensation, and can effectively increase the flow and flow rate of the working liquid through the heat pipe, thereby improving the heat dissipation effect of the low-boiling heat sink.
[0005] In order to achieve the above purpose, the utility model provides a low-boiling heat sink, which comprises an evaporator, a condensing fin set and a heat pipe. The evaporator has a chamber, the condensing fin set is arranged opposite to the evaporator, the condensing fin set has a converging cavity and a diverging cavity, the heat pipe is connected between the evaporator and the condensing fin set along a longitudinal direction, the heat pipe has an evaporation channel and a back suction channel which are not directly connected to each other, the cross sections of the evaporation channel and the back suction channel are non-circular, the evaporation channel is connected to the chamber and the diverging cavity along the longitudinal direction, and the back suction channel is connected to the converging cavity and the chamber along the longitudinal direction.
[0006] In an embodiment of the utility model, the heat pipe is connected at or near the center of the condensing fin set.
[0007] In an embodiment of the utility model, the heat pipe forms a plurality of convex ribs in the evaporation channel, and each convex rib extends along the longitudinal direction.
[0008] In an embodiment of the present application, each protruding rib is arranged on the inner wall of the evaporation passage away from the back suction passage.
[0009] In an embodiment of the present application, the heat conducting pipe has a plurality of capillary structures in the back suction passage, each capillary structure extends along the longitudinal direction and is arranged on at least one inner wall of the back suction passage.
[0010] In an embodiment of the present application, the evaporator comprises a bottom plate, a shell and a plurality of heat dissipation partitions, the shell is arranged on the bottom plate to form a chamber between the bottom plate and the shell, each heat dissipation partition is arranged in the chamber in parallel with each other and perpendicular to the longitudinal direction, each heat dissipation partition has an evaporation gap and a back suction gap, each evaporation gap is arranged along the longitudinal direction and communicates with the evaporation passage, and each back suction gap is arranged along the longitudinal direction and communicates with the back suction passage.
[0011] In an embodiment of the present application, the shell has a transition chamber, the shell has a mounting port, a converging opening and a diverging opening in the transition chamber, one end of the heat conducting pipe connected with the evaporator is arranged in the transition chamber through the mounting port, the evaporation passage communicates with each evaporation gap through the converging opening, and the back suction passage communicates with each back suction gap through the diverging opening.
[0012] In an embodiment of the present application, the condensation fin group comprises a main body, a plurality of first partitions and a plurality of second partitions, each first partition is arranged on one side of the main body in parallel with each other and perpendicular to the longitudinal direction, each of the plurality of second partitions is arranged on the other side of the main body in parallel with each other and perpendicular to the longitudinal direction, each first partition has a first gap, each first gap is arranged in the diverging chamber along the longitudinal direction and communicates with the evaporation passage, and each second partition has a second gap, each second gap is arranged in the converging chamber along the longitudinal direction and communicates with the back suction passage.
[0013] In an embodiment of the present application, the main body has a pair of connecting chambers, each connecting chamber is located on both sides of each first partition and each second partition, each first partition and the main body form a plurality of first heat dissipation passages, each first gap communicates with each connecting chamber through each first heat dissipation passage, each second partition and the main body form a plurality of second heat dissipation passages, and each connecting chamber communicates with each second gap through each second heat dissipation passage.
[0014] In an embodiment of the present application, the condensation fin group further comprises a plurality of first heat dissipation fins and a plurality of second heat dissipation fins, each first heat dissipation fin is arranged in the main body and located between each first partition and each second partition, and each second heat dissipation fin is arranged on the side of each second partition away from each first partition.
[0015] The low-boiling radiator has the advantages that the heat-conducting pipe is longitudinally connected between the evaporator and the condensing fin group, the evaporation passage and the back suction passage of the heat-conducting pipe are not directly communicated and are both non-circular, the working liquid can form a circulation loop without mutual interference during evaporation and condensation, the flow and the flow rate of the working liquid through the heat-conducting pipe are effectively increased, and the heat dissipation effect of the low-boiling radiator is improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a perspective view of the utility model.
[0017] Figure 2 It is an exploded view of the utility model.
[0018] Figure 3 It is an exploded view of the evaporator of the utility model.
[0019] Figure 4 It is another exploded view of the evaporator of the utility model.
[0020] Figure 5 It is a partial exploded view of the condensing fin group of the utility model.
[0021] Figure 6 It is another partial exploded view of the condensing fin group of the utility model.
[0022] Figure 7 It is a sectional side view of the utility model.
[0023] Figure 8 It is a sectional view of the heat-conducting pipe of the condensing fin group towards the evaporator of the utility model.
[0024] Figure 9 It is a sectional view of the heat-conducting pipe of the evaporator towards the condensing fin group of the utility model.
[0025] Figure 10 It is a sectional plan view of the utility model in use.
[0026] Figure 11 It is another sectional plan view of the utility model in use.
[0027] In the drawings:
[0028] 10: evaporator; 101: chamber; 11: bottom plate; 12: shell; 121: transition cavity; 122: mounting opening; 123: converging opening; 124: diverging opening; 13: heat dissipation partition; 131: evaporation notch; 132: back suction notch; 14: partition baffle; 20: condensation fin group; 201: converging cavity; 202: diverging cavity; 203: connecting chamber; 21: main body; 22: first partition; 221: first notch; 222: first heat dissipation channel; 23: second partition; 231: second notch; 232: second heat dissipation channel; 24: outer cover; 25: cover shell; 26: first heat dissipation fin; 27: second heat dissipation fin; 30: heat conduction pipe; 31: evaporation channel; 32: back suction channel; 33: convex rib; 34: capillary structure; D: longitudinal direction; H: heat source. DETAILED DESCRIPTION
[0029] The utility model will be further described below in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the example is not as the limitation of the utility model. In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms 'front side','rear side', 'left side', 'right side', 'front end','rear end', 'end', 'longitudinal direction', 'transverse direction','vertical direction', 'top', 'bottom' and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limiting condition of the utility model.
[0030] As used herein, terms such as "first", "second", "third", "fourth" and "fifth" describe various elements, components, regions, levels, or portions, which should not be limited by these terms. These terms can only be used to distinguish one element, component, region, level, or portion from another. Unless the context clearly indicates otherwise, the terms "first", "second", "third", "fourth", and "fifth" used herein do not imply order or sequence.
[0031] As used herein and unless otherwise defined, the terms "substantially" and "approximately" are used to describe and account for small variations. When used in connection with an event or circumstance, the terms can include the exact occurrence of the event or circumstance, as well as the occurrence of the event or circumstance to a close approximation. For example, when used in connection with a numerical value, the terms can include a range of variation less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%.
[0032] The low-boiling heat sink is used for being attached on a heat source H, and can form circulating flow through the internally filled working liquid to dissipate heat of the heat source H, as shown in Figure 7 、 Figure 10 and Figure 11 . Please refer to Figure 1 and Figure 2 firstly, the low-boiling heat sink of the utility model comprises an evaporator 10, a condensing fin set 20 and a heat pipe 30.
[0033] The evaporator 10 has a chamber 101. The condensing fin set 20 is arranged relative to the evaporator 10. The condensing fin set 20 has a converging cavity 201 and a diverging cavity 202. In the embodiment, the diverging cavity 202 is located above the converging cavity 201, but the utility model is not limited thereto, for example, the diverging cavity 202 can also be located on the left side or the right side of the converging cavity 201. The heat pipe 30 is connected between the evaporator 10 and the condensing fin set 20 along a longitudinal direction D. Specifically, the heat pipe 30 in the embodiment is fixed between the evaporator 10 and the condensing fin set 20 by welding and forms a seal, but the utility model is not limited thereto. The heat pipe 30 has an evaporation passage 31 and a suction passage 32 which are not directly communicated with each other. The cross sections of the evaporation passage 31 and the suction passage 32 are both non-circular. In the embodiment, the cross sections of the evaporation passage 31 and the suction passage 32 are both approximately rectangular, but the utility model is not limited thereto, for example, the cross sections of the evaporation passage 31 and the suction passage 32 can also be triangular, rhombic, parallelogram, elliptical, semicircular, pentagonal, polygonal or irregular…etc. The evaporation passage 31 extends along the longitudinal direction D and is communicated with the chamber 101 and the diverging cavity 202 at both ends. The suction passage 32 extends along the longitudinal direction D and is communicated with the converging cavity 201 and the chamber 101 at both ends. In other words, the evaporation passage 31 in the embodiment is located above the suction passage 32, but the utility model is not limited thereto.
[0034] Therefore, the evaporator 10, the heat conduction pipe 30 and the condensing fin group 20 form a closed internal circulation loop through the chamber 101, the evaporation channel 31, the branch cavity 202, the convergence cavity 201 and the back suction channel 32, so that the internal working liquid can evaporate into a gaseous state when heated in the chamber 101 of the evaporator 10, and then enter the condensing fin group 20 through the evaporation channel 31 from the branch cavity 202 to be cooled and condensed, and then enter the back suction channel 32 through the convergence cavity 201 to return to the chamber 101 of the evaporator 10 to form a circulation. Since the heat conduction pipe 30 is connected between the evaporator 10 and the condensing fin group 20 along the longitudinal direction D, and the evaporation channel 31 and the back suction channel 32 of the heat conduction pipe 30 are not directly connected to each other and are both non-circular, the working liquid does not interfere with each other when circulating, and the flow and speed of the working liquid through the heat conduction pipe 30 can be increased, thereby improving the heat dissipation effect of the low-boiling-point heat sink.
[0035] Further description, please refer to Figure 3 , Figure 4 , Figure 7 and Figure 8 , the evaporator 10 mainly includes a bottom plate 11, a shell 12 and a plurality of heat dissipation partitions 13. The shell 12 is arranged on the bottom plate 11, thereby forming a chamber 101 between the bottom plate 11 and the shell 12. The shell 12 has a liquid injection pipe (not labeled in the figure) to inject the working liquid into the chamber and then cut off and seal. In this embodiment, the shell 12 is fixed on the bottom plate 11 by welding, but the present application is not limited thereto. Each heat dissipation partition 13 is parallel to each other, and each heat dissipation partition 13 is arranged in the chamber 101 perpendicular to the longitudinal direction D. Each heat dissipation partition 13 has at least one evaporation gap 131 and at least one back suction gap 132. Specifically, the evaporation gap 131 is located above the back suction gap 132. In this embodiment, the number of back suction gaps 132 in each heat dissipation partition 13 is four, and each back suction gap 132 is arranged in a straight line and corresponds to the lower side of each evaporation gap 131, thereby strengthening the structural strength of each heat dissipation partition 13, reducing the size of each back suction gap 132, and preventing each heat dissipation partition 13 from deforming at each back suction gap 132 due to thermal expansion, but the number of evaporation gaps 131 and the number of back suction gaps 132 in each heat dissipation partition 13 can be adjusted accordingly according to different needs. The following is for convenience of description, only one evaporation gap 131 and its corresponding back suction gap 132 in each heat dissipation partition 13 are described.
[0036] Each evaporation gap 131 of each heat dissipation partition 13 is arranged along the longitudinal direction D and communicates with the evaporation passage 31. Each suction gap 132 of each heat dissipation partition 13 is arranged along the longitudinal direction D and communicates with the suction passage 32. The housing 12 has a transition cavity 121. The housing 12 forms a mounting opening 122, a converging opening 123 and a diverging opening 124 on different sides of the transition cavity 121, respectively. Specifically, the transition cavity 121 is formed by being recessed towards the inside of the housing 12 at the front end of the housing 12, the mounting opening 122 is located at the outside of the transition cavity 121, and the converging opening 123 and the diverging opening 124 are located at the inside of the transition cavity 121 and communicate with the chamber 101, respectively. The heat pipe 30 is connected to the evaporator 10 at one end and is inserted into the transition cavity 121 through the mounting opening 122, so that the evaporation passage 31 communicates with each evaporation gap 131 through the converging opening 123, and the suction passage 32 communicates with each suction gap 132 through the diverging opening 124. In this embodiment, the evaporator 10 further includes a partitioning baffle 14, which is arranged in the chamber 101 and abuts between the transition cavity 121 and each heat dissipation partition 13, thereby further partitioning the flow path in the chamber 101, so as to effectively ensure that the working liquid passing from each evaporation gap 131 to the evaporation passage 31 through the converging opening 123 does not mix into the suction passage 32, the diverging opening 124 or each suction gap 132, and at the same time, effectively ensure that the working liquid passing from the suction passage 32 to each suction gap 132 through the diverging opening 124 does not mix into the evaporation passage 31, the converging opening 123 or each evaporation gap 131.
[0037] Please refer to Figures 5 to 7 and Figure 9 As shown in FIG. 1, the condenser fin group 20 includes a main body 21, a plurality of first partitions 22 and a plurality of second partitions 23. Each first partition 22 is parallel to each other, and each first partition 22 is arranged on one side of the main body 21 perpendicularly to the longitudinal direction D. Each second partition 23 is parallel to each other, and each second partition 23 is arranged on the other side of the main body 21 perpendicularly to the longitudinal direction D. Each first partition 22 has at least one first gap 221. Each first gap 221 of each first partition 22 is arranged along the longitudinal direction D in the diverging cavity 202 and communicates with the evaporation passage 31. Each second partition 23 has at least one second gap 231. Each second gap 231 of each second partition 23 is arranged along the longitudinal direction D in the converging cavity 201 and communicates with the suction passage 32.
[0038] In the embodiment, the main body 21 is a block with a substantially rectangular shape, but the present application is not limited thereto. The upper and lower opposite sides of the main body 21 are respectively formed with a receiving groove (not labeled in the figure) to respectively arrange the first partitions 22 and the second partitions 23. The main body 21 has a pair of connecting chambers 203. Specifically, each connecting chamber 203 is respectively located at the opposite sides (left and right sides) of each first partition 22 and each second partition 23. In addition, the condensing fin set 20 further comprises an outer cover 24 and a cover shell 25, which are respectively arranged on the upper and lower opposite sides of the main body 21 to respectively cover each first partition 22 and each second partition 23. Each first partition 22 is jointly surrounded by the main body 21 and the outer cover 24 to form a plurality of first heat dissipation channels 222. Each first gap 221 is connected to the left and right connecting chambers 203 through each first heat dissipation channel 222. Each second partition 23 is jointly surrounded by the main body 21 and the cover shell 25 to form a plurality of second heat dissipation channels 232. Each connecting chamber 203 is connected to the middle second gap 231 through the second heat dissipation channels 232 on both sides.
[0039] The condensing fin set 20 further comprises a plurality of first heat dissipation fins 26 and a plurality of second heat dissipation fins 27. Each first heat dissipation fin 26 is arranged in the main body 21 and located between each first partition 22 and each second partition 23, and each first heat dissipation fin 26 is used to preliminarily dissipate the gaseous working fluid flowing through each first heat dissipation channel 222. Each second heat dissipation fin 27 is arranged on the side of each second partition 23 away from each first partition 22. Specifically, each second heat dissipation fin 27 is arranged in the cover shell 25, and each second heat dissipation fin 27 is used to secondarily dissipate the gaseous working fluid flowing through each second heat dissipation channel 232. Accordingly, the gaseous working fluid entering the shunt chamber 202 from the evaporation channel 31 is first preliminarily dissipated by each first heat dissipation channel 222 to enter the connecting chambers 203 on both sides, and then is secondarily dissipated by each second heat dissipation channel 232 to enter the converging chamber 201, so that the gaseous working fluid is cooled and condensed into liquid, and finally leaves the condensing fin set 20 through the suction channel 32.
[0040] Please refer to Figure 1 , Figure 2 , Figure 10 and Figure 11 , in the embodiment, the heat pipe 30 is substantially connected at or near the center of the condensing fin set 20, so that the heat pipe 30 and the condensing fin set 20 jointly have a substantially T-shaped structure. In this way, when the working fluid enters the shunt chamber 202 of the condensing fin set 20 from the evaporation channel 31, it can be respectively shunted and diffused to both sides from the center or near the center of the condensing fin set 20 through each first heat dissipation channel 222 on both sides, thereby achieving good flow distribution and heat dissipation effects, but the present application is not limited to this configuration.
[0041] In the embodiment, the heat pipe 30 is a hollow cylinder formed integrally, so the evaporation passage 31 and the return passage 32 are formed in the heat pipe 30 in parallel with each other, but in other embodiments, the heat pipe 30 can be two-piece and the evaporation passage 31 and the return passage 32 are formed in the heat pipe 30 respectively. In addition, the heat pipe 30 is formed with a plurality of ribs 33 in the evaporation passage 31. Each rib 33 extends along the longitudinal direction D. In the embodiment, each rib 33 is arranged on the inner wall of the evaporation passage 31 away from the return passage 32 (i.e. the top of the evaporation passage 31), so as to enhance the structural strength of the heat pipe 30 at the top of the evaporation passage 31, thereby preventing the heat pipe 30 from being deformed due to thermal expansion. In addition, the heat pipe 30 is formed with a plurality of capillary structures 34 in the return passage 32. In the embodiment, the capillary structure 34 can be formed in a groove type, a woven mesh type, a fiber type or a sintered metal powder type, and the present application is not limited to this. Those skilled in the art should be able to select according to different needs. Each capillary structure 34 extends along the longitudinal direction D, and each capillary structure 34 is arranged on at least one inner wall of the return passage 32, so as to increase the return force of the liquid working fluid, thereby ensuring that the working fluid can flow back from the condenser fin group 20 to the evaporator 10. In the embodiment, each capillary structure 34 is arranged on all the inner walls (four inner walls) of the return passage 32, so as to achieve the best return effect, but the present application is not limited to this. The arrangement position and the number of the capillary structure 34 can be adjusted according to different needs and the cross-sectional shape of the return passage 32.
[0042] The low-boiling heat sink of the present application can make the working fluid form an internal circulation loop between the evaporator 10, the heat pipe 30 and the condenser fin group 20 without interfering with each other during evaporation and condensation, and can effectively increase the flow and speed of the working fluid when passing through the heat pipe 30, thereby improving the overall heat dissipation effect of the low-boiling heat sink.
[0043] The above-described embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent replacement or transformation made by those skilled in the art based on the present application is within the protection scope of the present application.
Claims
1. A low-boiling heat spreader, characterized by, The application relates to a heat pipe evaporator, comprising: an evaporator having a chamber; a condenser fin group arranged opposite to the evaporator, the condenser fin group having a converging cavity and a diverging cavity; and a heat pipe connected between the evaporator and the condenser fin group along a longitudinal direction, the heat pipe having an evaporation channel and a suction channel which are not directly communicated with each other, the evaporation channel and the suction channel are both non-circular in cross section, the evaporation channel is communicated with the chamber and the diverging cavity along the longitudinal direction, and the suction channel is communicated with the converging cavity and the chamber along the longitudinal direction.
2. The low-boiling heat spreader of claim 1, wherein, The heat pipe is connected at or near the center of the condenser fin group.
3. The low-boiling heat spreader of claim 1, wherein, The heat pipe is formed with a plurality of convex ribs in the evaporation channel, each of the convex ribs extends along the longitudinal direction.
4. The low-boiling heat spreader of claim 3, wherein, Each of the convex ribs is arranged on the inner wall of the evaporation channel away from the suction channel.
5. The low-boiling heat spreader of claim 1, wherein, The heat pipe is formed with a plurality of capillary structures in the suction channel, each of the capillary structures extends along the longitudinal direction and is arranged on at least one inner wall of the suction channel.
6. The low-boiling heat spreader of claim 1, wherein, The evaporator comprises a bottom plate, a shell and a plurality of heat dissipation partitions, the shell is arranged on the bottom plate to form the chamber between the bottom plate and the shell, each of the heat dissipation partitions is arranged in parallel with each other and perpendicular to the longitudinal direction in the chamber, each of the heat dissipation partitions has an evaporation gap and a suction gap, each of the evaporation gaps is arranged in the longitudinal direction and communicated with the evaporation channel, and each of the suction gaps is arranged in the longitudinal direction and communicated with the suction channel.
7. The low-boiling heat spreader of claim 6, wherein, The shell has a transition cavity, the shell is formed with a mounting opening, a converging opening and a diverging opening in the transition cavity, one end of the heat pipe connected with the evaporator is arranged in the transition cavity through the mounting opening, the evaporation channel is communicated with each of the evaporation gaps through the converging opening, and the suction channel is communicated with each of the suction gaps through the diverging opening.
8. The low-boiling heat spreader of claim 1, wherein, The condenser fin group comprises a main body, a plurality of first partitions and a plurality of second partitions, each of the first partitions is arranged in parallel with each other and perpendicular to the longitudinal direction on one side of the main body, each of the second partitions is arranged in parallel with each other and perpendicular to the longitudinal direction on the other side of the main body, each of the first partitions has a first gap, each of the first gaps is arranged in the longitudinal direction in the diverging cavity and communicated with the evaporation channel, and each of the second partitions has a second gap, each of the second gaps is arranged in the longitudinal direction in the converging cavity and communicated with the suction channel.
9. The low-boiling heat spreader of claim 8, wherein, The main body has a pair of connecting cavities, each of the connecting cavities is located on both sides of each of the first partitions and each of the second partitions, each of the first partitions and the main body forms a plurality of first heat dissipation channels, each of the first gaps is communicated with each of the connecting cavities through each of the first heat dissipation channels, and each of the second partitions and the main body forms a plurality of second heat dissipation channels, each of the connecting cavities is communicated with each of the second gaps through each of the second heat dissipation channels.
10. The low-boiling heat spreader of claim 8, wherein, The condensation fin set further comprises a plurality of first heat dissipation fins and a plurality of second heat dissipation fins, each of the first heat dissipation fins is arranged in the main body and between each of the first partitions and each of the second partitions, and each of the second heat dissipation fins is arranged on a side of each of the second partitions away from each of the first partitions.