Heat dissipation mechanism and server
By setting up built-in and external fan modules inside and outside the server's chassis, suction force is formed, which solves the problem of difficulty in air discharge inside the chassis and significantly improves the heat dissipation effect of the server hardware.
Patent Information
- Application Number
- CN202323586293.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-27
AI Technical Summary
In the existing server's cooling design, it is difficult to discharge air inside the chassis to the outside, resulting in poor heat dissipation effect.
A heat dissipation mechanism is designed, including a built-in fan module and an external fan module. The built-in fan module is located between the air inlet and the air outlet inside the chassis, and the external fan module is located at the air outlet and the air inlet outside the chassis. Connection is connected to form a suction force, enhancing the air flow and heat dissipation effect.
Through the coordinated work of the built-in and external fan modules, the difficulty of air discharge to the outside is reduced, the heat dissipation effect of the internal hardware of the server is improved, and the smooth flow of air flow and heat dissipation performance is ensured.
Smart Images

Figure CN222259984U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of servers, and more specifically, to a heat dissipation mechanism and a server. Background Art
[0002] When the server is working, the internal hardware will generate heat. If the temperature is too high, the hardware will be damaged and the server will not be able to operate normally. Therefore, heat dissipation is required. At present, there are various forms of heat dissipation design for servers, but there are still some imperfections. For example, it is difficult to discharge the air inside the chassis to the outside of the chassis, and the heat dissipation effect is poor. Utility Model Content
[0003] The embodiments of the utility model are used to solve the technical problem in the prior art that it is difficult to discharge the air inside the chassis to the outside of the chassis.
[0004] In order to solve the above technical problems, the embodiment of the utility model provides a heat dissipation mechanism, which adopts the following technical solution:
[0005] A heat dissipation mechanism comprises a chassis, a built-in fan module and an external fan module, the chassis is provided with an air inlet and an air outlet, the built-in fan module is located inside the chassis and between the air inlet and the air outlet, the external fan module is located outside the chassis, and the air outlet is communicated with the air inlet end of the external fan module.
[0006] Furthermore, the air inlet and the air outlet are arranged opposite to each other.
[0007] Furthermore, the built-in fan module is located in the middle of the chassis.
[0008] Furthermore, a hard disk mounting frame is provided between the air inlet and the built-in fan module, and at least two hard disk mounting positions are provided on the hard disk mounting frame.
[0009] Furthermore, the hard disk mounting frame includes a frame body and a baffle, the frame body is installed in the chassis, the hard disk mounting position is arranged on the frame body, the baffle is hung with the frame body, and the baffle abuts against the hard disk.
[0010] Furthermore, a locking mechanism is provided between the baffle and the frame body.
[0011] Furthermore, the locking mechanism includes a connecting member, a special-shaped cam and a pressure member, one end of the connecting member is fixedly connected to the frame body, and the other end of the connecting member is rotatably connected to the special-shaped cam, the pressure member and the baffle plate can both move relative to the connecting member, and the special-shaped cam, the pressure member, the baffle plate and the frame body are abutted in sequence.
[0012] Furthermore, a hook and a limiting member are provided on the frame body, a hanging hole is provided on the upper portion of the baffle, the hook is located in the hanging hole, and the limiting member limits the bottom of the baffle.
[0013] Furthermore, a graphics card adapter frame is disposed inside the chassis, and the position of the graphics card adapter frame relative to the chassis can be adjusted according to the length of the graphics card, and a mounting position for the graphics card is formed between the graphics card adapter frame and the chassis.
[0014] In order to solve the above technical problems, the embodiment of the utility model further provides a server, which adopts the following technical solution:
[0015] A server comprises the heat dissipation mechanism mentioned above.
[0016] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:
[0017] By setting a built-in fan module inside the chassis, so that the built-in fan module is located between the air inlet and the air outlet on the chassis, the built-in fan module sucks the air outside the chassis into the chassis and then discharges it from the air outlet, which can dissipate heat for the hardware inside the server. By setting an external fan module outside the chassis, so that the air outlet of the chassis is connected to the air inlet end of the external fan module, a suction force can be formed on the air inside the chassis, reducing the difficulty of discharging the air inside the chassis to the outside of the chassis, and enhancing the effect of dissipating heat for the hardware inside the server. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings described below are only some embodiments of the present utility model. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
[0019] Figure 1 This is a schematic diagram of the overall structure of a server according to an embodiment of the utility model;
[0020] Figure 2 for Figure 1 A schematic diagram of the other direction of the server in FIG.
[0021] Figure 3 for Figure 1 Schematic diagram of the server with the top panel removed;
[0022] Figure 4 for Figure 1 A schematic diagram of the server in another direction after removing the top plate;
[0023] Figure 5 for Figure 1 The server in Figure 3 is different from Figure 3 and Figure 3 after removing the top plate. Figure 4Schematic diagram of the direction of
[0024] Figure 6 for Figure 1 The server in Figure 3 is different from Figure 3 after removing the top plate. Figure 4 and Figure 5 Schematic diagram of the direction of
[0025] Figure 7 for Figure 6 A schematic diagram of a hard disk mounting bracket in FIG.
[0026] Figure 8 for Figure 7 An exploded diagram of the hard disk mounting bracket in FIG.
[0027] Fig. 9 for Figure 8 A partial enlarged view of the middle A;
[0028] Fig.10 for Figure 8 A partial enlarged view of point B in the middle;
[0029] Fig.11 for Figure 8 A partial enlarged view of point C in the middle;
[0030] Fig.12 for Figure 8 A schematic diagram of the locking mechanism in FIG.
[0031] Fig.13 for Figure 8 A schematic diagram of the locking mechanism in another direction;
[0032] Fig.14 for Figure 3 Schematic diagram of the graphics card adapter bracket and graphics card fixing bracket in the figure.
[0033] Figure numerals: 1—chassis, 11—air inlet, 12—air outlet, 13—bottom plate, 14—top plate, 15—front panel, 16—rear panel, 17—side panel, 2—internal fan module, 3—external fan module, 4—hard disk mounting frame, 41—frame body, 411—hook, 412—limiting member, 4121—first pair of limiting members, 1211—bottom bracket, 1212—outer member, 1213—inner member, 4122—second pair Limiting parts, 1221—support plate, 1222—stopping parts, 4123—third pair of limiting parts, 4124—fourth pair of limiting parts, 4125—fifth pair of limiting parts, 42—baffle, 421—hanging hole, 5—locking mechanism, 51—connecting part, 52—special-shaped cam, 53—pressing part, 54—rotating shaft, 55—handle, 6—graphics card adapter frame, 61—fixing hole, 62—installing hole, 7—graphics card fixing frame, 71—adjustment hole, 8—graphics card. DETAILED DESCRIPTION
[0034] The present invention is described in more detail below in conjunction with specific examples, but the implementation of the present invention is not limited thereto. The examples are exemplary and intended to be used to explain the present invention, and cannot be understood as limiting the present invention. For process parameters or conditions not specifically noted, conventional techniques may be used.
[0035] See also Figures 1 to 14 As shown, an embodiment of the utility model provides a heat dissipation mechanism for a server, wherein the heat dissipation mechanism includes a chassis 1, a built-in fan module 2 and an external fan module 3. An air inlet 11 and an air outlet 12 are provided on the chassis 1. The built-in fan module 2 is located inside the chassis 1 and between the air inlet 11 and the air outlet 12. The external fan module 3 is located outside the chassis 1, and the air outlet 12 is communicated with the air inlet end of the external fan module 3.
[0036] By setting a built-in fan module 2 inside the chassis 1, so that the built-in fan module 2 is located between the air inlet 11 and the air outlet 12 on the chassis 1, when the built-in fan module 2 is working, the air outside the chassis 1 is sucked into the chassis 1 and then discharged from the air outlet 12, so that the heat dissipation of the hardware inside the server can be dissipated. By setting an external fan module 3 outside the chassis 1, so that the air outlet 12 of the chassis 1 is connected with the air inlet end of the external fan module 3, when the external fan module 3 is working, a suction force can be formed on the air inside the chassis 1. The built-in fan module 2 and the external fan module 3 work at the same time, and the ability of the air inside the chassis 1 to be discharged to the outside of the chassis 1 is strong, which reduces the difficulty of discharging the air inside the chassis 1 to the outside of the chassis 1, and enhances the effect of heat dissipation of the hardware inside the server.
[0037] Furthermore, in this embodiment, the air inlet 11 and the air outlet 12 are arranged opposite to each other, so that the air inlet direction is consistent with the air outlet direction, and the airflow for cooling the internal hardware of the server flows smoothly.
[0038] Specifically, the chassis 1 includes a bottom plate 13, a top plate 14, a front panel 15, a rear panel 16 and two side panels 17. The bottom plate 13 and the top plate 14 are arranged opposite to each other, the front panel 15 and the rear panel 16 are arranged opposite to each other, and the two side panels 17 are arranged opposite to each other. The two side panels 17 are located between the bottom plate 13 and the top plate 14. The bottom plate 13, the top plate 14, the front panel 15, the rear panel 16 and the two side panels 17 enclose a rectangular internal space. The air inlet 11 of the chassis 1 is arranged on the front panel 15, and the air outlet 12 of the chassis 1 is arranged on the rear panel 16. When heat is dissipated, the airflow flows from the front panel 15 to the rear panel 16, forming a straight path. The airflow flows smoothly and is easily discharged to the outside of the chassis 1. The air outside the chassis 1 is also easy to enter the chassis 1, and the heat dissipation effect is good.
[0039] It should be noted that, in this embodiment, the internal space of the chassis 1 is a rectangular parallelepiped. In other embodiments, the shape of the internal space of the chassis 1 can be adjusted according to specific circumstances, and can be a polyhedron, a hemispherical shape, etc. In other embodiments, the position of the air inlet 11 relative to the air outlet 12 can be adjusted, and the positions of the air inlet 11 and the air outlet 12 on the chassis 1 can also be adjusted: in Example 1, the air inlet 11 is set on the side panel 17, and the air outlet 12 is set on the rear panel 16; in Example 2, the air inlet 11 is set on the top panel 14, and the air outlet 12 is set on the rear panel 16; in Example 3, the air inlet 11 is set on the top panel 14, and the air outlet 12 is set on the bottom panel 13.
[0040] Furthermore, in this embodiment, the built-in fan module 2 is located in the middle of the chassis 1, so that the suction capacity of the built-in fan module 2 to the air inlet 11 and the exhaust capacity to the air outlet 12 are coordinated, and the heat dissipation effect is good. Of course, in other embodiments, according to specific circumstances, the position of the built-in fan module 2 in the chassis 1 can be adjusted. For example, the direction from the front panel 15 to the rear panel 16 is called the length direction. When the length of the hardware set between the front panel 15 and the built-in fan module 2 is reduced, the built-in fan module 2 can be adjusted from the middle of the chassis 1 to the direction close to the front panel 15; when the length of the hardware set between the rear panel 16 and the built-in fan module 2 is reduced, the built-in fan module 2 can be adjusted from the middle of the chassis 1 to the direction close to the rear panel 16.
[0041] Furthermore, in the present embodiment, a hard disk mounting rack 4 is provided between the air inlet 11 and the built-in fan module 2, and eight hard disk mounting positions are provided on the hard disk mounting rack 4, and the hard disk mounting positions are arranged in two layers, with four hard disk mounting positions on each layer. Of course, in other embodiments, the arrangement of the hard disk mounting positions can be adjusted according to the specific circumstances, for example, arranged in four layers, with two hard disk mounting positions on each layer; or, eight hard disk mounting positions are arranged in a row. In other embodiments, the number of hard disk mounting positions can also be adjusted. When the hard disk size is larger, the number of hard disk mounting positions can be reduced, for example, to seven, six, or even less; when the hard disk size is smaller, the number of hard disk mounting positions can be increased, for example, to nine, ten, or even more. Of course, in other embodiments, the hard disk mounting rack 4 can also be arranged between the rear panel 16 and the built-in fan module 2.
[0042] Furthermore, in this embodiment, the hard disk mounting frame 4 includes a frame body 41 and a baffle 42. The frame body 41 is installed in the chassis 1, the hard disk mounting position is set on the frame body 41, the baffle 42 is mounted on the frame body 41, and the baffle 42 abuts against the hard disk, which is convenient for installing the hard disk. Specifically, the bottom of the frame body 41 is installed on the bottom plate 13, one end of the frame body 41 is installed on the front panel 15, and the baffle 42 is mounted on the other end of the frame body 41. Of course, in other embodiments, the baffle 42 and the frame body 41 can be installed in a detachable manner such as screw installation or clamping.
[0043] Furthermore, in this embodiment, a locking mechanism 5 is provided between the baffle 42 and the frame body 41 to position the hard disk and prevent the hard disk from shaking.
[0044] Furthermore, in the present embodiment, the locking mechanism 5 includes a connecting member 51, a shaped cam 52 and a pressing member 53. One end of the connecting member 51 is fixedly connected to the frame body 41, and the other end of the connecting member 51 is rotatably connected to the shaped cam 52. The pressing member 53 and the baffle plate 42 can both move relative to the connecting member 51. The shaped cam 52, the pressing member 53, the baffle plate 42 and the frame body 41 are abutted in sequence. Specifically, one end of the connecting member 51 is connected to the frame body 41 by a threaded connection, the pressing member 53 is located between the special-shaped cam 52 and the baffle 42, the baffle 42 is located between the pressing member 53 and the frame body 41, and the other end of the connecting member 51 is connected to the special-shaped cam 52 by a rotating shaft 54. The special-shaped cam 52 is provided with a handle 55, and the special-shaped cam 52 can be rotated by the handle 55. When the special-shaped cam 52 rotates to the position in the long diameter direction of the special-shaped cam 52 and contacts the pressing member 53, the special-shaped cam 52 presses the pressing member 53 toward the frame body 41, and the pressing member 53 transmits the pressure of the special-shaped cam 52 to the baffle 42, and the baffle 42 is pressed onto the frame body 41 to prevent the baffle 42 and the frame body 41 from loosening, which can form an effective limiting effect on the hard disk and ensure the normal operation of the hard disk. It can be understood that when the shaped cam 52 rotates to the position in the short diameter direction of the shaped cam 52 and contacts the pressing member 53, the baffle 42 and the frame body 41 are loosened, and the hard plate can be removed for maintenance or replacement. Of course, in other embodiments, the connecting member 51 and the frame body 41 can also be connected by welding or clamping. In other embodiments, the structure of the locking mechanism 5 can also be adjusted. For example, screws or bolts can be used as the locking mechanism 5 to fix the baffle 42 and the frame body 41 together, or clips can be used as the locking mechanism 5 to clamp the baffle 42 and the frame body 41 together.
[0045] Further, in this embodiment, a hook 411 and a stopper 412 are provided on the frame body 41, a hanging hole 421 is provided on the upper part of the baffle 42, the hook 411 is located in the hanging hole 421, and the stopper 412 stops the bottom of the baffle 42, so as to facilitate the connection between the baffle 42 and the frame body 41. Specifically, there are five pairs of stoppers 412, and along the length direction of the bottom of the baffle 42, the five pairs of stoppers 412 are sequentially called the first pair of stoppers 4121, the second pair of stoppers 4122, the third pair of stoppers 4123, the fourth pair of stoppers 4124 and the fifth pair of stoppers 4125, and the five pairs of stoppers 412 are evenly distributed along the length direction of the bottom of the baffle 42, and the first pair of stoppers 4121 and the fifth pair of stoppers 4125 stop the two ends of the bottom of the baffle 42, so as to achieve a good stopper effect. The first pair of limiting members 4121 and the fifth pair of limiting members 4125 have the same structure, and the second pair of limiting members 4122, the third pair of limiting members 4123 and the fourth pair of limiting members 4124 have the same structure. The first pair of limiting members 4121 includes a bottom bracket 1211, an outer member 1212 and an inner member 1213. The end of the bottom bracket 1211 is connected to the frame body 41. The outer member 1212 and the inner member 1213 are both arranged on the bottom bracket 1211. The inner member 1213 limits the side of the baffle 42 facing the hard disk, and the outer member 1212 limits the side of the baffle 42 away from the hard disk. The upper part of the outer member 1212 extends in a direction away from the baffle 42 to form a guiding inclined surface, so that the baffle 42 can be inserted between the outer member 1212 and the inner member 1213. The second pair of limiting members 4122 includes a support plate 1221 and two stoppers 1222. The end of the support plate 1221 is connected to the frame body 41. The two stoppers 1222 are both arranged on the support plate 1221. The baffle 42 is inserted between the two stoppers 1222. The two stoppers 1222 and the support plate 1221 are both formed into an arch bridge shape. Two openings are formed on the support plate 1221. The two stoppers 1222 are formed by the material depressions originally located in the two openings, which facilitates the processing of the stoppers 1222 and saves materials. Of course, in other embodiments, the five pairs of limiters 412 may all use the structure of the first pair of limiters 4121, or may all use the structure of the second pair of limiters 4122, or may simultaneously use the structure of the first pair of limiters 4121 of any number (for example, three pairs) and the structure of the second pair of limiters 4122 of any number (for example, four pairs), and the structure of the first pair of limiters 4121 and the structure of the second pair of limiters 4122 may be arranged arbitrarily. In other embodiments, the number of pairs of limiters 412 may be adjusted, for example, two pairs, three pairs, four pairs, six pairs, or even more, and the structures of all pairs may be completely the same or partially the same, or the structures of all pairs are completely different. In other embodiments, the structure of the limiter 412 may be adjusted, for example, a concave structure or a hook structure may be used, as long as the baffle 42 can be well limited.
[0046] In this embodiment, the hook 411 is disposed on the frame body 41 , and the hanging hole 421 is disposed on the baffle 42 . Of course, in other embodiments, the hook 411 may be disposed on the baffle 42 , and the hanging hole 421 may be disposed on the frame body 41 accordingly.
[0047] Furthermore, in this embodiment, a graphics card adapter frame 6 is provided inside the chassis 1. The position of the graphics card adapter frame 6 relative to the chassis 1 can be adjusted according to the length of the graphics card, and a mounting position for the graphics card is formed between the graphics card adapter frame 6 and the chassis 1. Specifically, a graphics card fixing frame 7 is installed on the built-in fan module 2. The graphics card fixing frame 7 is provided with adjustment holes 71. The adjustment holes 71 are provided with eight rows, each row has five adjustment holes 71, and the eight rows are divided into four groups in turn, each group has two rows of adjustment holes 71, and the graphics card adapter frame 6 is provided with four. The four graphics card adapter frames 6 are all L-shaped. The L-shaped long arm of each graphics card adapter frame 6 is provided with three fixing holes 61 for installing a graphics card, and the L-shaped short arm of each graphics card adapter frame 6 is provided with two mounting holes 62. The two mounting holes 62 are docked and installed with the two adjustment holes 71 in one group. The two mounting holes 62 are docked and installed with the two adjustment holes 71 in one group. Among the adjustment holes 71, one adjustment hole 71 is located in one row in the group, and the other adjustment hole 71 is located in another row in the group. By docking and installing the two mounting holes 62 of the graphics card adapter frame 6 with two adjustment holes 71 at different positions in a group, the position of the adapter frame relative to the chassis 1 can be changed. For example, when the length of the graphics card 8 increases, the graphics card adapter frame 6 is docked and installed with two adjustment holes 71 in a group that are closer to the built-in fan module 2; when the length of the graphics card 8 decreases, the graphics card adapter frame 6 is docked and installed with two adjustment holes 71 in a group that are farther from the built-in fan module 2. Of course, in other embodiments, the number of rows of adjustment holes 71 can be adjusted according to the number of graphics cards 8. For example, three graphics cards 8 can be provided with six rows of adjustment holes 71, and five graphics cards 8 can be provided with ten rows of adjustment holes 71. Of course, in other embodiments, the structural shape of the adjustment hole 71 can be adjusted: Example 1, when the server is equipped with three graphics cards 8, three adjustment holes 71 can be set, each adjustment hole 71 is in the shape of a long strip, the length direction of the long strip is consistent with the length direction of the graphics card 8, each adjustment hole 71 is installed in conjunction with a graphics card adapter frame 6, and the position of the graphics card adapter frame 6 can be continuously adjusted; Example 2, when the server is equipped with five graphics cards 8, ten adjustment holes 71 can be set, each adjustment hole 71 is in the shape of a long strip, the length direction of the long strip is consistent with the length direction of the graphics card 8, and a graphics card adapter frame 6 is installed in conjunction with two adjacent adjustment holes 71. It is preferred that one graphics card adapter frame 6 is installed in conjunction with two adjustment holes 71 to avoid adverse effects on the graphics card 8 caused by the deflection of the graphics card adapter frame 6.
[0048] The embodiment of the utility model further provides a server, which includes the heat dissipation mechanism described above. The server uses the heat dissipation mechanism of the utility model, which reduces the difficulty of exhausting the air inside the chassis 1 to the outside of the chassis 1 and enhances the heat dissipation effect of the internal hardware of the server.
[0049] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. There are many ways of detachable installation, for example, it can be through the method of plug-in and buckle matching, and for example, through the method of bolt connection, etc.
[0050] The above clearly and completely describes the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation.
[0051] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above-mentioned utility model, which fall within the scope of protection of the present invention.
Claims
1. A heat dissipation mechanism, characterized in that: The heat dissipation mechanism includes a chassis, a built-in fan module and an external fan module. The chassis is provided with an air inlet and an air outlet. The built-in fan module is located inside the chassis and between the air inlet and the air outlet. The external fan module is located outside the chassis, and the air outlet is communicated with the air inlet end of the external fan module.
2. The heat dissipation mechanism according to claim 1, characterized in that: The air inlet and the air outlet are arranged opposite to each other.
3. The heat dissipation mechanism according to claim 1 or 2, characterized in that: The built-in fan module is located in the middle of the chassis.
4. The heat dissipation mechanism according to claim 1 or 2, characterized in that: A hard disk mounting frame is arranged between the air inlet and the built-in fan module, and at least two hard disk mounting positions are arranged on the hard disk mounting frame.
5. The heat dissipation mechanism according to claim 4, characterized in that: The hard disk mounting frame comprises a frame body and a baffle, the frame body is mounted in the chassis, the hard disk mounting position is arranged on the frame body, the baffle is hung with the frame body, and the baffle abuts against the hard disk.
6. The heat dissipation mechanism according to claim 5, characterized in that: A locking mechanism is arranged between the baffle and the frame body.
7. The heat dissipation mechanism according to claim 6, characterized in that: The locking mechanism includes a connecting member, a special-shaped cam and a pressing member, one end of the connecting member is fixedly connected to the frame body, and the other end of the connecting member is rotatably connected to the special-shaped cam, the pressing member and the baffle plate can both move relative to the connecting member, and the special-shaped cam, the pressing member, the baffle plate and the frame body are abutted in sequence.
8. The heat dissipation mechanism according to claim 5, characterized in that: The frame body is provided with a hook and a limiting member, the upper part of the baffle is provided with a hanging hole, the hook is located in the hanging hole, and the limiting member limits the bottom of the baffle.
9. The heat dissipation mechanism according to claim 1 or 2, characterized in that: A graphics card adapter frame is arranged inside the chassis, and the position of the graphics card adapter frame relative to the chassis can be adjusted according to the length of the graphics card. An installation position for the graphics card is formed between the graphics card adapter frame and the chassis.
10. A server, characterized in that: The server comprises the heat dissipation mechanism according to any one of claims 1 to 9.