CN115397211B - Enhanced natural convection type heat dissipation device - Google Patents
Enhanced natural convection type heat dissipation device Download PDFInfo
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- CN115397211B CN115397211B CN202211074460.XA CN202211074460A CN115397211B CN 115397211 B CN115397211 B CN 115397211B CN 202211074460 A CN202211074460 A CN 202211074460A CN 115397211 B CN115397211 B CN 115397211B
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- natural convection
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20409—Outer radiating structures on heat dissipating housings, e.g. fins integrated with the housing
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
本申请涉及一种增强型自然对流式散热装置，涉及自然对流散热技术领域；其包括壳体以及设置于壳体内的散热单元，所述散热单元包括若干个肋片，全部所述肋片的其中一侧均连接于壳体内部底壁，全部所述肋片相对壳体内部底壁的高度呈中间高两侧低的状态分布；本申请具有实现密闭空间内的流体自循环，强化换热、散热效果，提高散热换热效率的效果。
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 efficiency.
Description
Technical Field
The application relates to the technical field of natural convection heat dissipation, in particular to an enhanced natural convection heat dissipation device.
Background
The natural convection heat dissipation is to eliminate the flow caused by the non-uniformity of the temperature field of the fluid without being pushed by external force such as a pump or a fan, and the principle is to utilize the cold and hot change of the air to generate convection to take away the heat of a heat source. Natural convection processes move fluid heat transfer primarily through temperature differences and density gradients. The natural convection heat dissipation mode is used as a heat dissipation mode with wide application, has the characteristics of simple structure, high reliability, low cost and lower heat dissipation density, and is applied to various industries. In the electronics field, natural convective heat dissipation can rapidly transfer heat in the device, thereby preventing the device from overheating.
The related Chinese patent with the publication number of CN211931145U discloses a natural convection radiator which comprises a bottom plate and fins, wherein the fins are arranged on the side wall of one side of the bottom plate at intervals, the side wall of one side of the bottom plate, which is away from the fins, is a heating surface, the heating surface is used for being attached to the heating surface of a heating electronic element, when the natural convection radiator is used, the bottom plate is arranged on the heating electronic element, the heating surface of the bottom plate is attached to the heating surface of the heating electronic element, heat generated by heating of the heating electronic element is conducted to the fins through the heating surface, and heat on the fins is exchanged with air around the fins, so that heat dissipation is realized.
The present inventors have found that, in the above-mentioned related art, air convection is formed by expanding heated air and forming relatively cooled air when the heated air is unevenly heated, but the fins in the above-mentioned technology are uniformly distributed on the bottom plate, and when the heat generated by the heat-generating electronic components is conducted to the fins, the air around all the fins on the bottom plate is heated substantially uniformly, so that the air convection around the fins is not obvious, resulting in low heat dissipation efficiency.
Disclosure of Invention
In order to improve the heat dissipation efficiency of the heat dissipation device, the application provides an enhanced natural convection type heat dissipation device.
The application provides an enhanced natural convection type heat dissipation device, which adopts the following technical scheme:
The utility model provides an enhancement mode nature convection type heat abstractor, includes the casing and sets up the radiating element in the casing, the radiating element includes a plurality of fin, all one of them all connect in the inside diapire of casing, all the fin is the high state distribution of both sides low in the centre relative to the height of the inside diapire of casing.
Through adopting above-mentioned technical scheme, laminate the casing diapire in external heat source to make the heat that the heat source contains get into the casing inside and conduct to the fin through the casing diapire, the fin carries out heat convection with ambient air, in addition, because the fin is the high state distribution of both sides low in the centre with respect to the height of casing diapire, therefore the fin heat conduction that is located the centre is fastest, corresponding air around the fin that is located the centre is heated fastest, and hot air is lighter than cold air, therefore the air around the fin that is located the centre will heat the rising faster than the air around the fin that is located both sides, above-mentioned structure and the distribution through designing the fin improve the inside confined space of casing in the difference in temperature, thereby strengthen air convection, strengthen the heat transfer effect, improve heat transfer, radiating efficiency.
Preferably, the heat dissipation unit further comprises a partition plate distributed on the periphery of the rib, one side of the partition plate is connected to the bottom wall inside the shell, the partition plate and the bottom wall inside the shell enclose a heat flow channel together, and a through hole is formed in the side wall, close to the bottom, of the partition plate in a penetrating mode.
Through adopting above-mentioned technical scheme, baffle and the inside diapire of casing have formed relative closed heat flow channel, this region surrounds the fin, consequently, when external heat conducts to the fin on, the fin surrounding air is heated and is formed hot air, the effect of baffle can play the effect of gathering together relatively hot air, the hot air in the heat flow channel will rise fast and shift up this moment, when the hot air shifts up, air density reduces in this heat flow channel, form the negative pressure, this moment heat flow channel outlying cold air will be can the through-hole department get into in the heat flow channel, realize the vortex, reach the self-loopa of heat flow channel inside and outside air, improve convection heat transfer efficiency.
Preferably, an end of the partition plate away from the bottom wall of the housing is inclined toward a direction approaching the heat flow passage.
Through adopting above-mentioned technical scheme, the baffle of above-mentioned slope further plays spacing effect that gathers together to the hot air that moves up, the upward movement direction of control hot air.
Preferably, one side of the partition plate is rotatably connected to the bottom wall inside the shell, the other side of the partition plate is inclined towards the direction close to the heat flow channel, and a first elastic piece for supporting the partition plate is arranged at the rotary connection position of the partition plate and the shell.
Through adopting above-mentioned technical scheme, first elastic component can play the supporting role to the baffle, simultaneously, because the baffle rotates to be connected in the inside diapire of casing, therefore the baffle can appear slight swing when receiving the air current flow influence to further play the vortex, improve the effect of fluid velocity of flow, first elastic component can guarantee that the baffle can rotate when supporting the baffle.
Preferably, the aperture of the through hole near the heat flow channel is smaller than the aperture of the through hole far from the heat flow channel.
Through adopting above-mentioned technical scheme, after the hot air in the heat flow channel moves up and leaves the heat flow channel, the peripheral cold air of baffle will get into in the heat flow channel from the through-hole, because the through-hole aperture reduces gradually towards the direction that is close to the heat flow channel this moment, consequently the cold air will receive the resistance of through-hole inner wall when passing the through-hole, and correspondingly, the air current also can exert to push away to the baffle to make the baffle can swing with its junction with the casing diapire as the center.
Preferably, a shutoff piece is arranged on the side wall of one side of the partition board, which is close to the heat flow channel, and a gap is reserved between the shutoff piece and the partition board.
Through adopting above-mentioned technical scheme, the setting of closure piece can reduce the condition that hot air in the heat flow channel shifted out the heat flow channel from the through-hole to ensure that the most hot air in the heat flow channel homoenergetic is discharged from heat flow channel top, corresponding, the clearance between closure piece and the baffle can make baffle outlying cold air can get into in the heat flow channel smoothly from the through-hole, has restricted the flow direction of fluidic promptly, realizes the unidirectional flow of through-hole department fluidic.
Preferably, the heat dissipation unit further comprises a splitter plate symmetrically arranged above the partition plate, and a gap for fluid to pass through is reserved between the splitter plate and the partition plate.
Through adopting above-mentioned technical scheme, the hot air that is heated and rises in the heat flow channel will strike the flow distribution plate when moving to flow distribution plate department to through flow distribution plate with hot air reposition of redundant personnel Cheng Duogu hot air flow, the heat that the hot air carried is dispersed when striking with the flow distribution plate on the one hand, on the other hand, the hot air flow continues to move up to the shell upper end, thereby makes the heat transfer to the external world through the shell roof, realizes the heat dissipation.
Preferably, the heat dissipation unit comprises a fixing rod and guide plates symmetrically connected to the side walls of the fixing rod in a rotating mode, a yielding groove for inserting one side of the guide plates is formed in the side walls of the fixing rod, one side of each guide plate is rotationally connected in the yielding groove, and a yielding space for the guide plates to rotate is reserved between the inner walls of the yielding grooves and the side walls of the guide plates.
Through adopting above-mentioned technical scheme, when hot air moved up and impacted the guide plate, the guide plate will rotate taking its rotation junction with the dead lever as the center under the striking of hot air, and the guide plate will be incited the surrounding air in the rotation in-process, accelerates the velocity of flow of fluid on the one hand, on the other hand also can play the radiating effect to hot air.
Preferably, a second elastic piece is arranged between the inner wall of the yielding groove and the side wall of the guide plate, and the second elastic piece is used for supporting the insertion position of the guide plate in the yielding groove and resetting the rotation of the guide plate.
Through adopting above-mentioned technical scheme, the setting of second elastic component can play the supporting role to the guide plate, also can play the reset effect to the rotation of guide plate simultaneously, and the guide plate can reciprocate the shake under the elasticity effect of second elastic component, optimizes the effect of flaring to guide plate surrounding air.
Preferably, a cooling cavity is arranged in the splitter plate or the guide plate, and cooling liquid is filled in the cooling cavity.
Through adopting above-mentioned technical scheme, when hot air moves up to flow divider or guide plate department, because flow divider or guide plate are filled with the coolant liquid in, therefore when hot air striking flow divider or guide plate, flow divider or guide plate can cool off the hot air.
In summary, the present application includes at least one of the following beneficial technical effects:
The heat exchange effect is enhanced by utilizing the ribs with the heights of symmetrical double peaks, the self circulation of fluid in the device is realized by the structures of the guide plate, the impact holes and the like, the turbulent flow of the fluid is enhanced, the heat convection efficiency is improved, and the heat exchange device has the characteristics of less required materials, smaller volume, low cost, stability and reliability under the same heat dissipation capacity.
Drawings
Fig. 1 is a cross-sectional view of an enhanced natural convection heat sink according to embodiment 1.
Fig. 2 is a schematic view for showing the flow direction of the air flow in the case in embodiment 1.
Fig. 3 is a cross-sectional view of an enhanced natural convection heat sink according to embodiment 2.
Fig. 4 is a cross-sectional view for showing the positional relationship between the partition board and the housing in embodiment 2.
Fig. 5 is a schematic diagram for embodying the structure at the separator in embodiment 3.
Fig. 6 is a cross-sectional view showing the connection relationship between the baffle and the fixing lever in embodiment 4.
The reference numerals are 1, a shell, 11, an embedded groove, 2, a heat radiating unit, 21, a baffle plate, 211, a through hole, 212, a rotating rod, 213, a first elastic piece, 214, a shutoff piece, 215, an extending groove, 22, a rib, 23, a flow dividing plate, 231, a cooling cavity, 24, a heat flow channel, 25, a fixing rod, 251, a yielding groove, 252, a yielding space, 253, a second elastic piece, 26 and a flow guiding plate.
Detailed Description
The application is described in further detail below with reference to fig. 1-6.
Example 1
Referring to fig. 1 and 2, the enhanced natural convection heat dissipation device comprises a casing 1, wherein the casing 1 is of a hollow six-face sealing structure, a plurality of heat dissipation units 2 are arranged in the casing 1, the number of the heat dissipation units 2 is 3 in the application, the heat dissipation units 2 are uniformly distributed in the casing 1 along the length direction of the casing 1, when the bottom wall of the casing 1 is contacted with an external heat source, heat of the heat source is conducted into the casing 1 through the bottom wall of the casing 1, and then the heat is rapidly gathered and conducted to the top wall of the casing 1 through the heat dissipation units 2, and at the moment, the heat is released to the outside from the top wall of the casing 1, so that heat dissipation is realized.
Referring to fig. 1 and 2, the heat dissipating unit 2 includes two partitions 21, several ribs 22 and two flow dividing plates 23, the lower ends of the ribs 22 are welded to the bottom wall inside the case 1, the ribs 22 may be divided into several groups along the width direction of the case 1, the number of the ribs 22 in each group is at least 3, the width and length of each group of the ribs 22 are in the range of 2-4 mm, the distance between adjacent ribs 22 is in the range of 3-6 mm, the height of the ribs is in the range of 2-8 mm, the height of all the ribs 22 in the same group are in peak-like normal distribution along the length direction of the case 1, the structures of the ribs 22 may be straight ribs, needle-shaped ribs, triangular ribs, trapezoidal ribs or curved surface structures with gradual cross sections or parabolas or more cross sections mixed, and the arrangement mode is sequential or staggered distribution, and the case and the ribs 22 are made of aluminum alloy or copper material with high heat conductivity.
Referring to fig. 1 and 2, the partition plate 21 is located inside the casing 1, the length direction of the partition plate 21 is set along the width direction of the casing 1, one side of the partition plate 21 is welded to the bottom wall inside the casing 1, two partition plates 21 of the same heat dissipation unit 2 are in a reduced splayed shape from bottom to top, the bottoms of two partition plates 21 adjacent to each other of the heat dissipation units 2 are attached to each other, two partition plates 21 of the same heat dissipation unit 2 and the bottom wall of the casing 1 jointly enclose a heat flow channel 24, the ribs 22 are located in the heat flow channel 24, and a plurality of through holes 211 are formed in the side wall of each partition plate 21 near the bottom in a penetrating manner so as to realize circulation of fluid at two sides of the partition plate 21.
Referring to fig. 1 and 2, two flow dividing plates 23 are located above the partition plates 21, the middle of each flow dividing plate 23 is recessed towards the direction away from the heat flow channel 24 to form an arc plate, one sides of the two flow dividing plates 23, which are close to each other, are welded and fixed with each other, a gap for fluid circulation is reserved between the flow dividing plates 23 and the partition plates 21, the distance between the outer edges of the two flow dividing plates 23 is greater than the distance between the tops of the two partition plates 21, a cooling cavity 231 is formed in each flow dividing plate 23, and cooling liquid is filled in the cooling cavity 231.
The embodiment 1 of the application is implemented by attaching the bottom wall of the housing 1 to an external heat source, the heat of the heat source is conducted to the fins 22 through the bottom wall of the housing 1, and as the height of the fins 22 at the middle position in each heat dissipating unit 2 is highest, correspondingly, the air around the fins 22 at the middle most part is heated to be hot air and rises, the hot air moves upwards in the limit direction of the partition plate 21 to be discharged out of the heat flow channel 24 and collides with the splitter plate 23, the splitter plate 23 splits the hot air into two heat flows, the heat flows are continuously moved upwards to the top wall of the housing 1, so that the heat is released to the outside from the top wall of the housing 1, and in the process, the air at the periphery of the heat flow channel 24 is subjected to negative pressure action to enter the heat flow channel 24 from the through hole 211, so that the self circulation of the air flow is realized, the air flow mobility is improved, and the heat exchanging effect is further improved.
Example 2
Referring to fig. 3 and 4, the difference between embodiment 2 and embodiment 1 of the present application is that the bottom of the partition 21 is welded with a rotating rod 212 at both ends thereof, the inner wall of the housing 1 is provided with an embedded groove 11, the rotating rod 212 is rotatably connected in the embedded groove 11, a first elastic member 213 is further provided outside the rotating rod 212, the first elastic member 213 may be a torsion spring, 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, the other end is welded to the inner wall of the embedded groove 11, the aperture of the through hole 211 on the partition 21 gradually decreases along the direction approaching to the heat flow channel 24, when cold air on one side of the partition 21 enters the heat flow channel 24 through the through hole 211, the cold air is subjected to a moving resistance due to the change of the aperture of the through hole 211, and accordingly, the partition 21 is also subjected to the thrust of the air flow to swing about the rotating rod 212 as the center, the first elastic member 213 can play a role in supporting the position of the partition 21 relative to the housing 1 and realizing the rotating reset of the partition 21.
Example 3
Referring to fig. 5, the difference between embodiment 3 and embodiment 1 of the present application is that an extension groove 215 communicating with the through hole 211 is formed on the sidewall of the partition plate 21 near the through hole 211, an arc-shaped shut-off piece 214 is welded on the inner wall of the extension groove 215, the shut-off piece 214 is located in the heat flow channel 24, a gap is reserved between the side of the shut-off piece 214 far from the extension groove 215 and the partition plate 21, the set of the shut-off piece 214 plays a role of realizing unidirectional ventilation of the air flow 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 plate 21 far from the heat flow channel 24, but not hot air in the heat flow channel 24, that is, reducing the situation that the hot air in the heat flow channel 24 is discharged from the through hole 211 to the heat flow channel 24, and ensuring that the hot air in the heat flow channel 24 can be discharged from above the heat flow channel 24.
Example 4
Referring to fig. 6, the difference between embodiment 4 and embodiment 1 of the present application is that the heat dissipating unit 2 includes a fixing rod 25 and two guide plates 26, a cooling cavity 231 for containing cooling liquid is formed inside the guide plates 26, a yielding groove 251 is formed on the side wall of the fixing rod 25 near each guide plate 26, one side of the guide plates 26 is rotatably connected in the yielding groove 251, a yielding space 252 for the guide plates to rotate is reserved between the inner wall of the yielding groove 251 and the side wall of the guide plates 26, a second elastic member 253 is jointly disposed between the inner wall of the yielding groove 251 and the side wall of the guide plates 26, the second elastic member 253 can be a spring, one end of the second elastic member 253 is welded on the inner wall of the yielding groove 251, the other end of the second elastic member is welded on the side wall of the guide plates 26, and when the hot air moving up from the heat flow channel 24 impacts the guide plates 26, the guide plates 26 are rotated, and the second elastic member 253 supports the guide plates 26 and drives the guide plates 26 to shake.
The above embodiments are not intended to limit the scope of the application, so that the equivalent changes of the structure, shape and principle of the application are covered by the scope of the application.
Claims (7)
1. The enhanced natural convection type heat dissipation device is characterized by comprising a shell (1) and a heat dissipation unit (2) arranged in the shell (1), wherein the heat dissipation unit (2) comprises a plurality of ribs (22), one side of all the ribs (22) is connected to the bottom wall inside the shell (1), and all the ribs (22) are distributed in a state that the middle of the height of the ribs is higher than the height of the bottom wall inside the shell (1) and the two sides of the ribs are lower than the height of the ribs;
The heat dissipation unit (2) further comprises a partition plate (21) distributed on the periphery of the rib (22), one side of the partition plate (21) is connected to the bottom wall inside the shell (1), the partition plate (21) and the bottom wall inside the shell (1) jointly enclose a heat flow channel (24), and a through hole (211) is formed in the side wall, close to the bottom, of the partition plate (21) in a penetrating mode;
One side of the partition plate (21) is rotatably connected to the bottom wall inside the shell (1), the other side of the partition plate (21) is inclined towards the direction close to the heat flow channel (24), and a first elastic piece (213) for supporting the partition plate (21) is arranged at the rotary connection part of the partition plate (21) and the shell (1);
the side wall of one side of the partition plate (21) close to the heat flow channel (24) is provided with a shutoff piece (214), the shutoff piece (214) is arranged on the side wall of the partition plate (21) close to the through hole (211), and a gap is reserved between the shutoff piece (214) and the partition plate (21).
2. An enhanced natural convection heat sink as set forth in claim 1 wherein the end of the partition plate (21) remote from the bottom wall of the housing (1) is disposed obliquely toward the direction approaching the heat flow passage (24).
3. The enhanced natural convection heat sink of claim 1 wherein the aperture of the through-hole (211) proximate the heat flow channel (24) is smaller than the aperture of the through-hole (211) distal the heat flow channel (24).
4. The enhanced natural convection heat sink of claim 1 wherein the heat sink unit (2) further comprises a diverter plate (23) symmetrically disposed above the baffle plate (21), wherein a gap for fluid to pass through is reserved between the diverter plate (23) and the baffle plate (21).
5. The enhanced natural convection heat sink of claim 4, wherein the heat dissipating unit (2) comprises a fixing rod (25) and guide plates (26) symmetrically and rotatably connected to the side walls of the fixing rod (25), a yielding groove (251) for inserting one side of the guide plates (26) is formed in the side walls of the fixing rod (25), one side of the guide plates (26) is rotatably connected in the yielding groove (251), and a yielding space (252) for the rotation of the guide plates (26) is reserved between the inner walls of the yielding groove (251) and the side walls of the guide plates (26).
6. The enhanced natural convection heat sink of claim 5, wherein a second elastic member (253) is disposed between the inner wall of the relief groove (251) and the side wall of the baffle (26), and the second elastic member (253) is used for supporting the insertion position of the baffle (26) in the relief groove (251) and resetting the rotation of the baffle (26).
7. The enhanced natural convection heat sink as set forth in claim 6, wherein a cooling cavity (231) is provided inside the flow dividing plate (23) or the flow guiding plate (26), and the cooling cavity (231) is filled with a cooling liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211074460.XA CN115397211B (en) | 2022-09-03 | 2022-09-03 | Enhanced natural convection type heat dissipation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211074460.XA CN115397211B (en) | 2022-09-03 | 2022-09-03 | Enhanced natural convection type heat dissipation device |
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| CN115397211A CN115397211A (en) | 2022-11-25 |
| CN115397211B true CN115397211B (en) | 2025-05-23 |
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| CN115397211A (en) | 2022-11-25 |
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