CN103277769B - LED (Light Emitting Diode) radiator with liquid metal isothermal chamber - Google Patents
LED (Light Emitting Diode) radiator with liquid metal isothermal chamber Download PDFInfo
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- CN103277769B CN103277769B CN201310229744.6A CN201310229744A CN103277769B CN 103277769 B CN103277769 B CN 103277769B CN 201310229744 A CN201310229744 A CN 201310229744A CN 103277769 B CN103277769 B CN 103277769B
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Abstract
The invention relates to an LED (Light Emitting Diode) radiator with a liquid metal isothermal chamber. The LED radiator with the liquid metal isothermal chamber is characterized by comprising a vacuum chamber, phase transition working mediums, liquid metal liquid drops and radiating fins; the phase transition working mediums and liquid metal liquid drops are filled inside the vacuum chamber; and the external side of the vacuum chamber is provided with the radiating fins. The liquid metal liquid drops enable the boiling heat transferring area of the vacuum chamber bottom surface to be increased and heat convection is further intensified due to pulsation of the liquid metal liquid drops under bubble impact. According to the LED radiator with the liquid metal isothermal chamber, the heat transferring effect is greatly improved in comparison with a traditional device due to the fact that the boiling heat transferring performance of the phase transition and good pulsation heat transferring performance of the liquid metal liquid drops are fully combined and effective heat radiating of the LED is achieved.
Description
Technical field
The present invention relates to a kind of LED radiator, this radiator fully combines the boiling heat transfer of phase-change working substance and the heat transfer property of liquid metal droplet excellence, make its heat transfer effect comparatively conventional apparatus be greatly improved.The present invention can realize the efficiently radiates heat of LED component.
Background technology
Photoelectric field, in LED, there are close relationship in junction temperature and life-span.Generally speaking, temperature often reduces the 10oC life-span and can extend 2 times, and therefore LED heat radiation is link very important in LED lamp design.The heat at LED thermal source place, in the process being passed to environment, overcome the thermal contact resistance between thermal source and radiator, the diffusion thermal resistance of radiator and the free convection thermal resistance between radiator and environment.For each link, industrial quarters has all carried out effective exploration, reduces the heat-conducting cream of thermal contact resistance as developed series, reduces the temperature-uniforming plate of radiator diffusion thermal resistance, and reduces the structure optimization etc. of free convection thermal resistance.
Temperature-uniforming plate is a kind of typical enhance heat technology solving diffusion thermal resistance.Conventional temperature-uniforming plate is fine copper temperature-uniforming plate or embedding heat pipe-type copper temperature-uniforming plate, and it has certain limitation.The samming mode of fine copper temperature-uniforming plate is mainly heat conduction, and when heat flow density raises, its even temperature effect is unsatisfactory.Heat pipe embeds in copper base by embedding heat pipe-type copper temperature-uniforming plate, can significantly improve the samming ability of substrate, but adopting heat pipes for heat transfer is anisotropy, and the temperature-uniforming plate heat transfer along heat pipe direction is better, and poor perpendicular to heat pipe direction even temperature effect.The vacuum chamber temperature-uniforming plate developed in recent years can realize omnibearing even temperature effect, phase-change liquid fills in the cavity of vacuum by it, liquid bottom vacuum chamber, after the heat absorbing LED thermal source, in evaporation and diffusion to whole vacuum chamber, realizes the multidimensional rapid diffusion of heat.At present, vacuum chamber temperature-uniforming plate is the comparatively advanced equal temperature technique of LED, but improving constantly along with LED integrated level, its power density constantly increases, and the heat-transfer capability of vacuum chamber temperature-uniforming plate needs further lifting badly.
For this reason, the present invention proposes a kind of liquid metals samming chamber LED radiator.By liquid metal droplet being filled in the bottom of vacuum chamber temperature-uniforming plate, reach the effect increasing heat exchange area, promote the coefficient of heat transfer.Its typical advantages is as follows: the filling of (1) liquid metal droplet can increase the heat exchange area bottom vacuum chamber temperature-uniforming plate, makes the contact of vacuum chamber and phase-change working substance more abundant; (2) liquid metal droplet is pulsed up and down along with the evaporation and condensation of phase-change working substance, plays the effect of strengthening heat convection; (3) liquid metal droplet excellent thermal conductivity, significantly can reduce the thermal contact resistance of vacuum chamber temperature-uniforming plate and phase-change working substance; (4) liquid metal droplet stable in properties, nontoxic, and thus system stability is reliable.
Summary of the invention
The object of the present invention is to provide a kind of LED radiator, this radiator fully combines the boiling heat transfer of phase-change working substance and the heat transfer property of liquid metal droplet excellence, make its heat transfer effect comparatively conventional apparatus be greatly improved.The present invention can realize the efficiently radiates heat of LED component.
Technical scheme of the present invention is as follows:
A kind of liquid metals samming chamber provided by the invention LED radiator, as shown in Figure 1, it is composed as follows:
One vacuum chamber 1, fills phase-change working substance and liquid metal droplet in described vacuum chamber 1, is connected outside vacuum chamber with fin;
One phase-change working substance 2, described phase-change working substance 2 is filled in described vacuum chamber 1, and working medium realizes flash heat transfer by phase transformation;
One liquid metal droplet 3, described liquid metal droplet 3 is filled in described vacuum chamber 1 inner bottom part, in order to increase heat transfer area and strengthening convection heat transfer' heat-transfer by convection effect; The surface tension of liquid metals is larger, can always present liquid pearl state under evaporating the effect of the bubble period impact produced at liquid;
One fin 4, described fin 4 is positioned at outside described vacuum chamber 1, and the heat in described vacuum chamber 1 is passed to surrounding environment.
Described vacuum chamber 1 shape can be cylindrical shape or cuboid, and material can be aluminium, copper, stainless steel and carbon steel.
Described phase-change working substance 2 can be ammonia, water, acetone, hexane, freon and ethanol.
Described liquid metals 3 mainly comprises gallium base bianry alloy, gallium based multicomponent alloy, indium-base alloy or bismuth-base alloy.
Described gallium base bianry alloy is gallium-indium alloy, gallium bismuth alloy or gallium ashbury metal.
Described gallium based multicomponent alloy is gallium-indium-tin alloy or gallium indium tin kirsite.
Described bismuth-base alloy is bismuth indium stannum alloy or bismuth ashbury metal.
During work, the heat at thermal source 5 place to be passed to bottom vacuum chamber 1 and to heat phase-change working substance 2 and liquid metal droplet 3, phase-change working substance 2 is by thermal evaporation, its steam moves to whole vacuum chamber and realizes heat transfer, when the wall that steam is lower with vacuum chamber temperature contacts, be condensed into liquid and participate in bottom the vacuum chamber that falls back circulating next time; Meanwhile, liquid metal droplet 3 one aspect be heated and phase-change working substance 2 carry out heat exchange; On the other hand, liquid metal droplet 3 is carried pulsation by the steam evaporated, and reaches the effect of augmentation of heat transfer.
A kind of liquid metals samming chamber of the present invention LED radiator tool has the following advantages:
(1) filling of liquid metal droplet can increase the heat exchange area bottom vacuum chamber temperature-uniforming plate, makes the contact of vacuum chamber and phase-change working substance more abundant;
(2) liquid metal droplet is pulsed up and down along with the evaporation and condensation of phase-change working substance, plays the effect of strengthening heat convection;
(3) liquid metal droplet excellent thermal conductivity, significantly can reduce the thermal contact resistance of vacuum chamber temperature-uniforming plate and phase-change working substance;
(4) liquid metal droplet stable in properties, nontoxic, and thus system stability is reliable.
Accompanying drawing explanation
Fig. 1 is a kind of liquid metals samming chamber LED radiator structural representation in embodiment 1.
Detailed description of the invention
The present invention is further described below in conjunction with drawings and the specific embodiments.
Embodiment 1
Embodiment 1 illustrates a kind of typical apply of liquid metals samming chamber of the present invention LED radiator.Fig. 1 is liquid metals samming chamber LED radiator structural representation.
As shown in Figure 1, the liquid metals samming chamber LED radiator of the present embodiment is made up of vacuum chamber 1, phase-change working substance 2, liquid metal droplet 3 and fin 4.
In the present embodiment, vacuum chamber 1 is cylindrical shape, external diameter 10cm, wall thickness 1cm, copper material, and in it, vacuum is 1.2 × 10
-2pa.
Phase-change working substance 2 is deionized water, and the volumetric filling ratio in vacuum chamber is 10%.
Liquid metal droplet 3 is gallium indium tin kirsite (mass fraction: 61% Ga, 25% In, 13% Sn, 1%Zn), and its safety non-toxic, fusing point is 8oC, and the volumetric filling ratio in vacuum chamber is 5%.
Fin 4 material is aluminium, and total area of dissipation is 1.2m
2.
During work, the heat at thermal source 5 place to be passed to bottom vacuum chamber and heating deionized water 2 and liquid metal droplet 3, deionized water 2 is by thermal evaporation, steam moves to whole vacuum chamber and realizes heat transfer, when the wall that steam is lower with vacuum chamber temperature contacts, be condensed into liquid water and participate in bottom the vacuum chamber that falls back circulating next time; Meanwhile, liquid metal droplet 3 one aspect be heated and deionized water 2 carry out heat exchange; On the other hand, liquid metal droplet 3 is carried pulsation by the steam evaporated, and reaches the effect of augmentation of heat transfer.
The heat-transfer effect of liquid metals samming chamber LED radiator involved in the present invention is assessed below by typical case.
Experiment shows, the use of liquid metal droplet 3 can make the area of dissipation bottom vacuum chamber increase by 10%, and the flow-disturbing effect of liquid metal droplet 3 can make boiling convection transfer rate improve 30% ~ 50%, when thermal source heat flow density is constant, from heat transfer formula (1):
(1)
Known
(2)
Wherein, Q is the heat at thermal source place, and h is convection transfer rate, and A is heat convection area, is the heat convection temperature difference.Subscript 1 represents traditional vacuum chamber LED radiator, and subscript 2 represents liquid metals samming chamber of the present invention LED radiator.
If the boiling heat transfer temperature difference at LED radiator vacuum chamber base plate place, traditional vacuum chamber is 20 DEG C, according to formula (2), the vacuum chamber boiling temperature difference in the present invention is only 14 DEG C, has the temperature drop of 6 DEG C, augmentation of heat transfer Be very effective compared to traditional LED radiator.
Finally it should be noted that above embodiment only in order to technical scheme of the present invention to be described and unrestricted.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, modify to technical scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. a liquid metals samming chamber LED radiator, it is characterized in that, it is composed as follows:
One vacuum chamber, fills phase-change working substance and liquid metal droplet in described vacuum chamber, is connected outside vacuum chamber with fin;
One phase-change working substance, described phase-change working substance is filled in vacuum chamber, and working medium realizes flash heat transfer by phase transformation;
One liquid metal droplet, described liquid metal droplet is filled in vacuum chamber inner bottom part, in order to increase heat transfer area and strengthening convection heat transfer' heat-transfer by convection effect;
One fin, described fin is positioned at outside vacuum chamber, and the heat in vacuum chamber is passed to surrounding environment.
2., by a kind of liquid metals samming chamber according to claim 1 LED radiator, it is characterized in that, described vacuum chamber shape is cylindrical shape or cuboid, and material is aluminium, copper, stainless steel and carbon steel.
3., by a kind of liquid metals samming chamber according to claim 1 LED radiator, it is characterized in that, described phase-change working substance is ammonia, water, acetone, hexane, freon and ethanol.
4., by a kind of liquid metals samming chamber according to claim 1 LED radiator, it is characterized in that, described liquid metals comprises gallium base bianry alloy, gallium based multicomponent alloy, indium-base alloy or bismuth-base alloy.
5., by a kind of liquid metals samming chamber according to claim 4 LED radiator, it is characterized in that, described gallium base bianry alloy is gallium-indium alloy, gallium bismuth alloy or gallium ashbury metal.
6., by a kind of liquid metals samming chamber according to claim 4 LED radiator, it is characterized in that, described gallium based multicomponent alloy is gallium-indium-tin alloy or gallium indium tin kirsite.
7., by a kind of liquid metals samming chamber according to claim 4 LED radiator, it is characterized in that, described bismuth-base alloy is bismuth indium stannum alloy or bismuth ashbury metal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775965B (en) * | 2014-01-28 | 2015-12-02 | 邱旭堂 | Cold junction directly dispels the heat glass heat pipe LED lamp |
| CN103884217A (en) * | 2014-04-09 | 2014-06-25 | 北京依米康科技发展有限公司 | Heat dissipation device for low-melting-point metal through composite phase change |
| CN104540373A (en) * | 2014-12-23 | 2015-04-22 | 江苏大学 | Low-melting-point alloy-silicon-based miniature cooler used for smartphone heat dissipation |
| CN108155282A (en) * | 2017-11-27 | 2018-06-12 | 安徽西马新能源技术有限公司 | A kind of LED cooling stands |
| CN110290686A (en) * | 2019-07-24 | 2019-09-27 | 中国科学院理化技术研究所 | A kind of composite radiating system |
| CN114234689B (en) * | 2021-11-25 | 2023-09-01 | 苏州浪潮智能科技有限公司 | Enhanced boiling heat exchange structure and temperature equalization plate |
| CN117423796B (en) * | 2023-12-18 | 2024-03-19 | 长春工程学院 | High-power LED illumination phase-change radiator with pulsating hot plate extension body |
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