An enhanced natural convection heat dissipation device

Abstract

The present application relates to an enhanced natural convection heat dissipation device, and relates to the technical field of natural convection heat dissipation; it comprises a shell and a heat dissipation unit arranged in the shell, the heat dissipation unit comprises a plurality of fins, one side of all the fins are connected to the inner bottom wall of the shell, and the height of all the fins relative to the inner bottom wall of the shell is distributed in a state of being high in the middle and low on both sides; the present application has the effect of realizing self-circulation of fluid in a closed space, enhancing heat exchange and heat dissipation effects, and improving heat dissipation and heat exchange efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of natural convection heat dissipation, and in particular to an enhanced natural convection heat dissipation device. Background Art

[0002] Natural convection cooling refers to the flow caused by the uneven temperature field of the fluid itself without relying on external forces such as pumps or fans. The principle is to use the change in air temperature to generate convection to carry away the heat from the heat source. The natural convection process mainly uses temperature difference and density gradient to move the fluid to transfer heat. As a widely used cooling method, natural convection cooling has the characteristics of simple structure, high reliability, low cost and low heat dissipation density, making it used in all walks of life. In the field of electronics, natural convection cooling can quickly transfer heat in the equipment, thereby preventing the equipment from overheating.

[0003] The relevant Chinese patent with authorization announcement number CN211931145U discloses a natural convection radiator, including a base plate and fins, wherein the fins are arranged at intervals on the side wall on one side of the base plate, and the side wall of the base plate away from the fins is a heating surface, and the heating surface is used to fit with the heating surface of the heating electronic component; when in use, the base plate is installed on the heating electronic component, and the heating surface of the base plate is made to fit with the heating surface of the heating electronic component, and the heat generated by the heating of the heating electronic component will be conducted to the fins through the heating surface, and the heat on the fins will achieve heat exchange with the air around the fins, thereby achieving heat dissipation.

[0004] With respect to the above-mentioned related technologies, the inventors found that, combined with existing knowledge, air convection refers to the situation where, when the air is heated unevenly, the heated air expands and rises, and the relatively cooled air moves down. However, the fins in the above-mentioned technologies are evenly distributed on the base plate. When the heat generated by the heat-generating electronic components is conducted to the fins, the air around all the fins on the base plate is heated basically evenly. Therefore, the air convection around the above-mentioned fins is not obvious, resulting in low heat dissipation efficiency. Summary of the invention

[0005] In order to improve the heat dissipation efficiency of the heat dissipation device, the present application provides an enhanced natural convection heat dissipation device.

[0006] The present application provides an enhanced natural convection heat dissipation device, which adopts the following technical solution:

[0007] An enhanced natural convection heat dissipation device comprises a shell and a heat dissipation unit arranged in the shell, wherein the heat dissipation unit comprises a plurality of fins, one side of all the fins is connected to the inner bottom wall of the shell, and the height of all the fins relative to the inner bottom wall of the shell is distributed in a state of being higher in the middle and lower on both sides.

[0008] By adopting the above technical solution, the bottom wall of the shell is attached to the external heat source, so that the heat contained in the heat source enters the shell through the bottom wall of the shell and is conducted to the fins, and the fins perform convection heat exchange with the surrounding air. In addition, since the height of the fins relative to the bottom wall of the shell is distributed in a state of being higher in the middle and lower on both sides, the fin located in the middle conducts heat the fastest, and correspondingly, the air around the fin located in the middle is heated the fastest, and hot air is lighter than cold air, so the air around the fin located in the middle will be heated and rise faster than the air around the fins located on both sides. The structure and distribution of the fins are designed to increase the temperature difference in the closed space inside the shell, thereby strengthening air convection, enhancing the heat exchange effect, and improving the heat exchange and heat dissipation efficiency.

[0009] Preferably, the heat dissipation unit further comprises a partition distributed around the fins, one side of the partition being connected to the inner bottom wall of the shell, the partition and the inner bottom wall of the shell together enclose a heat flow channel, and a through hole is formed through the side wall of the partition near the bottom.

[0010] By adopting the above technical solution, the partition and the bottom wall inside the shell form a relatively closed heat flow channel, which surrounds the ribs. Therefore, when the external heat is conducted to the ribs, the air around the ribs is heated to form hot air. The partition can play a relatively gathering role for the hot air. At this time, the hot air in the heat flow channel will quickly heat up and move upward. When the hot air moves upward, the air density in the heat flow channel decreases, forming a negative pressure. At this time, the cold air outside the heat flow channel can enter the heat flow channel through the hole, realizing turbulence, achieving self-circulation of air inside and outside the heat flow channel, and improving the convective heat exchange efficiency.

[0011] Preferably, one end of the partition away from the bottom wall of the shell is inclined toward the direction close to the heat flow channel.

[0012] By adopting the above technical solution, the above inclined partition further plays a role of limiting and gathering the upward moving hot air, thereby controlling the upward moving direction of the hot air.

[0013] Preferably, one side of the partition is rotatably connected to the inner bottom wall of the shell, and the other side of the partition is inclined toward the direction close to the heat flow channel. A first elastic member for supporting the partition is provided at the rotatable connection between the partition and the shell.

[0014] By adopting the above technical solution, the first elastic member can play a supporting role for the partition. At the same time, since the partition is rotatably connected to the bottom wall inside the shell, the partition can swing slightly when affected by the air flow, thereby further playing a role in disturbing the flow and increasing the fluid flow rate. The first elastic member can support the partition while ensuring that the partition can rotate.

[0015] Preferably, the aperture of the through hole close to the heat flow channel is smaller than the aperture of the through hole far from the heat flow channel.

[0016] By adopting the above technical solution, when the hot air in the hot flow channel moves up and leaves the hot flow channel, the cold air outside the partition will enter the hot flow channel from the through hole. At this time, since the aperture of the through hole gradually decreases toward the direction close to the hot flow channel, the cold air will encounter resistance from the inner wall of the through hole when passing through the through hole. Correspondingly, the airflow will also push the partition away, so that the partition can swing around its connection with the bottom wall of the shell.

[0017] Preferably, a cut-off piece is provided on a side wall of the partition close to the hot flow channel, the cut-off piece is provided on the side wall of the partition close to the through hole, and a gap is reserved between the cut-off piece and the partition.

[0018] By adopting the above technical solution, the setting of the shut-off plate can reduce the situation where the hot air in the hot flow channel moves out of the hot flow channel from the through hole, thereby ensuring that most of the hot air in the hot flow channel can be discharged from the top of the hot flow channel. Correspondingly, the gap between the shut-off plate and the partition can allow the cold air outside the partition to smoothly enter the hot flow channel from the through hole, that is, the flow direction of the fluid is restricted, thereby realizing the unidirectional flow of the fluid at the through hole.

[0019] Preferably, the heat dissipation unit further comprises a diverter plate symmetrically arranged above the partition, and a gap for fluid to pass through is reserved between the diverter plate and the partition.

[0020] By adopting the above technical solution, the hot air that rises in the heat flow channel will hit the diverter plate when it moves up to the diverter plate, thereby diverting the hot air into multiple hot air flows through the diverter plate. On the one hand, the heat carried by the hot air flow is dispersed when it hits the diverter plate, and on the other hand, the hot air flow continues to move up to the upper end of the outer shell, so that the heat is transferred to the outside through the top wall of the outer shell to achieve heat dissipation.

[0021] Preferably, the heat dissipation unit includes a fixed rod and a guide plate symmetrically connected to the side wall of the fixed rod, the side wall of the fixed rod is provided with a clearance groove for inserting one side of the guide plate, one side of the guide plate is rotatably connected to the clearance groove, and a clearance space for the guide plate to rotate is reserved between the inner wall of the clearance groove and the side wall of the guide plate.

[0022] By adopting the above technical solution, when the hot air moves up and hits the guide plate, the guide plate will rotate with the rotating connection between it and the fixed rod as the center under the impact of the hot air. The guide plate will fan the surrounding air during the rotation process, which will accelerate the flow rate of the fluid on the one hand and also have a heat dissipation effect on the hot air on the other hand.

[0023] Preferably, a second elastic member is provided between the inner wall of the give way groove and the side wall of the guide plate, and the second elastic member is used to support the inserted position of the guide plate in the give way groove and reset the rotation of the guide plate.

[0024] By adopting the above technical solution, the setting of the second elastic member can support the guide plate and also reset the rotation of the guide plate. The guide plate can vibrate back and forth under the elastic force of the second elastic member, thereby optimizing the fanning effect of the air around the guide plate.

[0025] Preferably, a cooling cavity is provided inside the diverter plate or the guide plate, and the cooling cavity is filled with coolant.

[0026] By adopting the above technical solution, when the hot air moves up to the diverter plate or the guide plate, since the diverter plate or the guide plate is filled with coolant, when the hot air hits the diverter plate or the guide plate, the diverter plate or the guide plate can cool the hot air.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] The heat transfer effect is enhanced by using fins with a symmetrical double-peak distribution in height. The self-circulation of the fluid in the device is achieved through structures such as guide plates, impact plates and impact holes, which strengthens the turbulence of the fluid and improves the efficiency of convective heat transfer. With the same heat dissipation capacity, less material is required and the volume is smaller. It has the characteristics of low cost, stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of an enhanced natural convection heat dissipation device in Example 1.

[0030] Figure 2 It is a schematic diagram used to reflect the airflow direction in the shell in Example 1.

[0031] Figure 3 It is a cross-sectional view of an enhanced natural convection heat dissipation device in Example 2.

[0032] Figure 4 It is a cross-sectional view used to reflect the positional relationship between the partition and the shell in Example 2.

[0033] Figure 5 It is a schematic diagram used to illustrate the structure of the partition in Example 3.

[0034] Figure 6 It is a cross-sectional view used to illustrate the connection relationship between the guide plate and the fixing rod in Example 4.

[0035] Explanation of the reference numerals: 1. Shell; 11. Embedding groove; 2. Heat dissipation unit; 21. Partition; 211. Through hole; 212. Rotating rod; 213. First elastic member; 214. Shutoff plate; 215. Extension groove; 22. Rib; 23. Diverter plate; 231. Cooling cavity; 24. Heat flow channel; 25. Fixing rod; 251. Make way groove; 252. Make way space; 253. Second elastic member; 26. Guide plate. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-6 This application is described in further detail.

[0037] Example 1

[0038] Reference Figure 1 and Figure 2 The enhanced natural convection heat dissipation device includes a shell 1, which is a hollow six-sided sealed structure; a heat dissipation unit 2 is arranged inside the shell 1, and there can be multiple heat dissipation units 2. In the present application, the number of heat dissipation units 2 is 3; the heat dissipation units 2 are evenly distributed in the shell 1 along the length direction of the shell 1. When the bottom wall of the shell 1 is in contact with an external heat source, the heat from the heat source is conducted into the shell 1 through the bottom wall of the shell 1, and then the heat is quickly gathered and conducted to the top wall of the shell 1 through the heat dissipation unit 2. At this time, the heat will be released from the top wall of the shell 1 to the outside to achieve heat dissipation.

[0039] Reference Figure 1 and Figure 2 The heat dissipation unit 2 includes two partitions 21, a plurality of fins 22 and two diverter plates 23; the lower ends of the fins 22 are welded to the inner bottom wall of the shell 1, and the fins 22 can be divided into a plurality of groups along the width direction of the shell 1, and the number of fins 22 in each group is at least 3, and the width and length of each group of fins 22 are in the range of 2-4 mm, the spacing between adjacent fins 22 is in the range of 3-6 mm, and the height of the fins is in the range of 2-8 mm; the heights of all fins 22 belonging to the same group are normally distributed in a peak shape along the length direction of the shell 1; the structure of the fins 22 can be straight ribs, needle-shaped fins, triangular fins, trapezoidal fins, or a curved surface structure with a gradient cross-section or a parabola or a mixture of the above cross-sections, and the arrangement is sequential or staggered distribution, and the shell and the fins 22 are made of aluminum alloy or copper material with high thermal conductivity.

[0040] Reference Figure 1 and Figure 2The partition 21 is located inside the shell 1, and the length direction of the partition 21 is arranged along the width direction of the shell 1; one side of the partition 21 is welded to the bottom wall inside the shell 1, and the two partitions 21 belonging to the same heat dissipation unit 2 are in a reduced eight-shaped shape from bottom to top, and the bottoms of the two partitions 21 close to each other in adjacent heat dissipation units 2 fit each other; the two partitions 21 belonging to the same heat dissipation unit 2 and the bottom wall of the shell 1 together enclose a heat flow channel 24, and the ribs 22 are located in the heat flow channel 24; a plurality of through holes 211 are also penetrated through the side wall of each partition 21 near the bottom to realize the circulation of fluid on both sides of the partition 21.

[0041] Reference Figure 1 and Figure 2 The two diverter plates 23 are located above the partition 21, and the middle part of each diverter plate 23 is concave in the direction away from the hot flow channel 24 to form an arc-shaped plate, and the two diverter plates 23 are welded and fixed to each other on the sides close to each other; a gap for fluid circulation is reserved between the diverter plate 23 and the partition 21, and the distance between the outer edges of the two diverter plates 23 is greater than the distance between the tops of the two partitions 21; a cooling cavity 231 is opened inside each diverter plate 23, and the cooling cavity 231 is filled with coolant.

[0042] The implementation principle of an enhanced natural convection heat dissipation device in Example 1 of the present application is as follows: the bottom wall of the shell 1 is placed in contact with an external heat source, and the heat of the heat source is conducted to the ribs 22 through the bottom wall of the shell 1. Since the ribs 22 in the middle position of each heat dissipation unit 2 are the highest in height, correspondingly, the air around the middlemost ribs 22 will also be heated the fastest and become hot air and rise. The hot air moves upward under the limiting guidance of the partition 21 and is discharged from the heat flow channel 24 and collides with the diverter plate 23. The diverter plate 23 divides the hot air into two heat flows, and the heat flow continues to move upward to the top wall of the shell 1, so that the heat is released from the top wall of the shell 1 to the outside. In this process, since the hot air leaves the heat flow channel 24, the air density in the heat flow channel 24 is reduced, and the air outside the heat flow channel 24 will be subjected to the negative pressure and enter the heat flow channel 24 from the through hole 211, thereby realizing the self-circulation of the airflow, improving the fluidity of the airflow, and thereby improving the heat exchange effect.

[0043] Example 2

[0044] Reference Figure 3 and Figure 4, the difference between Example 2 of the present application and Example 1 is that: a rotating rod 212 is welded at the bottom and both ends of the partition 21, an embedding groove 11 is opened on the inner wall of the shell 1, and the rotating rod 212 is rotatably connected to the embedding groove 11, and a first elastic member 213 is also arranged on the outside of the rotating rod 212, and the first elastic member 213 can be a torsion spring, and the first elastic member 213 is sleeved on the rotating rod 212, one end of the first elastic member 213 is welded to the side wall of the partition 21, and the other end is welded to the inner wall of the embedding groove 11; the aperture of the through hole 211 on the partition 21 gradually decreases in the direction close to the hot flow channel 24; when the cold air on one side of the partition 21 enters the hot flow channel 24 through the through hole 211, the cold air is subjected to movement resistance due to the change in the aperture of the through hole 211, and accordingly, the partition 21 will also be subjected to the thrust of the airflow and swing around the rotating rod 212 as the center, and the first elastic member 213 can play a role in supporting the position of the partition 21 relative to the shell 1 and realizing the rotation and reset of the partition 21.

[0045] Example 3

[0046] Reference Figure 5 The difference between Example 3 of the present application and Example 1 is that: an extension groove 215 connected to the through hole 211 is opened on the side wall of the partition 21 near the through hole 211, and an arc-shaped cut-off piece 214 is welded on the inner wall of the extension groove 215, and the cut-off piece 214 is located in the hot flow channel 24, and a gap is reserved between the side of the cut-off piece 214 away from the extension groove 215 and the partition 21; the setting of the cut-off piece 214 plays a role in realizing one-way flow of air at the through hole 211, ensuring that most of the air flow passing through the through hole 211 is cold air on the side of the partition 21 away from the hot flow channel 24, rather than hot air in the hot flow channel 24, that is, reducing the situation where the hot air in the hot flow channel 24 is discharged from the hot flow channel 24 from the through hole 211, ensuring that the hot air in the hot flow channel 24 can be discharged from the hot flow channel 24 from above the hot flow channel 24.

[0047] Example 4

[0048] Reference Figure 6The difference between the embodiment 4 of the present application and the embodiment 1 is that: the heat dissipation unit 2 includes a fixing rod 25 and two guide plates 26, the guide plates 26 are provided with a cooling cavity 231 for containing coolant, the side wall of the fixing rod 25 near each guide plate 26 is provided with a clearance groove 251, one side of the guide plate 26 is rotatably connected to the clearance groove 251, and a clearance space 252 for the guide plate to rotate is reserved between the inner wall of the clearance groove 251 and the side wall of the guide plate 26; A second elastic member 253 is also provided between the inner wall of the positioning groove 251 and the side wall of the guide plate 26. The second elastic member 253 can be a spring. The second elastic member 253 is located in the positioning groove 251, and one end of the second elastic member 253 is welded to the inner wall of the positioning groove 251, and the other end is welded to the side wall of the guide plate 26. When the hot air moving up from the hot flow channel 24 hits the guide plate 26, the guide plate 26 rotates, and the second elastic member 253 will support the guide plate 26 and drive the guide plate 26 to shake.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An enhanced natural convection heat dissipation device, Features: It comprises a shell (1) and a heat dissipation unit (2) arranged in the shell (1), the heat dissipation unit (2) comprising a plurality of ribs (22), one side of all the ribs (22) being connected to the inner bottom wall of the shell (1), and the heights of all the ribs (22) relative to the inner bottom wall of the shell (1) being distributed in a state of being higher in the middle and lower on both sides; The heat dissipation unit (2) further comprises a partition (21) distributed on the periphery of the fins (22), one side of the partition (21) being connected to the inner bottom wall of the shell (1), the partition (21) and the inner bottom wall of the shell (1) together enclosing a heat flow channel (24), and a through hole (211) penetrating the side wall of the partition (21) near the bottom; One side of the partition (21) is rotatably connected to the inner bottom wall of the shell (1), and the other side of the partition (21) is inclined in a direction close to the hot flow channel (24). A first elastic member (213) for supporting the partition (21) is provided at the rotatable connection between the partition (21) and the shell (1); A cut-off piece (214) is provided on a side wall of the partition (21) close to the hot flow channel (24); the cut-off piece (214) is provided on the side wall of the partition (21) close to the through hole (211), and a gap is reserved between the cut-off piece (214) and the partition (21).

2. The enhanced natural convection heat dissipation device according to claim 1, Features: One end of the partition plate (21) away from the bottom wall of the shell (1) is arranged to be inclined in a direction close to the hot flow channel (24).

3. The enhanced natural convection heat dissipation device according to claim 1, Features: The aperture of the through hole (211) close to the heat flow channel (24) is smaller than the aperture of the through hole (211) far from the heat flow channel (24).

4. The enhanced natural convection heat dissipation device according to claim 1, Features: The heat dissipation unit (2) further comprises a flow divider plate (23) symmetrically arranged above the partition plate (21), and a gap for fluid to pass through is reserved between the flow divider plate (23) and the partition plate (21).

5. The enhanced natural convection heat dissipation device according to claim 4, Features: The heat dissipation unit (2) comprises a fixing rod (25) and a guide plate (26) symmetrically rotatably connected to a side wall of the fixing rod (25); the side wall of the fixing rod (25) is provided with a clearance groove (251) for inserting one side of the guide plate (26); one side of the guide plate (26) is rotatably connected to the clearance groove (251); and a clearance space (252) for the guide plate (26) to rotate is reserved between the inner wall of the clearance groove (251) and the side wall of the guide plate (26).

6. The enhanced natural convection heat dissipation device according to claim 5, Features: A second elastic member (253) is provided between the inner wall of the clearance groove (251) and the side wall of the guide plate (26), and the second elastic member (253) is used to support the insertion position of the guide plate (26) in the clearance groove (251) and to reset the rotation of the guide plate (26).

7. The enhanced natural convection heat dissipation device according to claim 6, Features: A cooling cavity (231) is provided inside the flow divider (23) or the flow guide plate (26), and the cooling cavity (231) is filled with a cooling liquid.

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