CN201748364U - Light emitting diode (LED) lamp with optimized heat dissipation and light fitting thereof - Google Patents
Light emitting diode (LED) lamp with optimized heat dissipation and light fitting thereof Download PDFInfo
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- CN201748364U CN201748364U CN2010201965771U CN201020196577U CN201748364U CN 201748364 U CN201748364 U CN 201748364U CN 2010201965771 U CN2010201965771 U CN 2010201965771U CN 201020196577 U CN201020196577 U CN 201020196577U CN 201748364 U CN201748364 U CN 201748364U
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Abstract
The utility model provides a light emitting diode (LED) lamp with optimized heat dissipation size and structure aiming at the natural convection heat transfer basic experiment research results of a rib structure, wherein the ratio between the height h of a rib and gap a is not more than 10.0, and the gas a is not less than 1.7mm. A convection cover (4) is added to further increase the heat dissipating capacity, so that the level that the aluminum per tile used for heat dissipation is less than 4g can be reached. In order to realize standardization, a radiating fin is separated from an LED lamp wick formed by an LED core (1) and a heat conduction core (12); and the radiating fin is a part fixed in a light fitting, and the concrete scheme for solving heat transmission between the heat conduction core (12) and the radiating fin is proposed.
Description
Technical field
The utility model belongs to the LED lighting technical field, specially refers to heat radiating fin structure and optimized dimensions design in the LED lamp.
Technical background
LED illumination, energy-conservation because of it, long-life and be subjected to the whole world and pay close attention to, be considered to lighting engineering of future generation.But its heat dissipation problem is current LED lighting engineering developing one big obstacle, and accounts for LED lamp considerable part cost, and restriction LED illumination popularization and application is exactly the cost price height of whole lamp.Free convection heat transfer does not have machinery motion, noiselessness, and the reliability height is the essential mode of LED heat radiation.But, the professional that the LED industry is interior and electron trade is interior, free convection heat transfer in the fin of rib-type structure do not had gem-pure understanding, lack basic research targetedly, do not know the high and influence of gap of fin in the fin to dispelling the heat, consequently: heat sink design is unreasonable, there is not optimal design idea, product size is big, heavy, cost are also just high, such as: the LED street lamp of 100W, radiator reaches more than ten kilogram with aluminium, also have in addition adopt expensive hot pipe technique.
Summary of the invention
The utility model proposes heat sink sizes and Optimal Structure Designing scheme based at free convection heat transfer basic research result in the LED fin, and proposes to strengthen the free convection heat transfer structure, will reduce heat transmission aluminium amount significantly, i.e. cost.
The technical solution of the utility model is: the LED lamp includes fin and LED core, fin includes heat-conducting block and fin, and fin stretches out from the side of heat-conducting block, and the average length that fin stretches out is greater than 10mm, heat-conducting block is setting setting up and down, fin also is erects setting, and the heat radiation air passes fin from bottom to top, the heat that the LED wick produces, by the heat-conducting block conduction heat transfer, pass to fin,, pass to the air that passes fin from the fin surface and to shed again with the method for free convection heat transfer.Feature of the present utility model is: the ratio of the mean gap between fin mean height (being fin passes direction at air size) and the fin is not more than 10.0, is not less than 2.0; Mean gap between the fin is greater than 1.7mm, and the mean height of fin is not more than 40mm.
The heat radiation process finally is that heat passes in the air, by air mobile (convection current) heat is taken away, and air mobile (convection current) is extremely important in the heat radiation process, and air mass flow is big more, and the heat that can take away (being heat dissipation capacity) is big more.The heat-conducting block of fin is erect setting up and down, and fin is also erect, and the free convection air is flowed from the bottom to top, pass fin, air flow resistance is little, helps heat dissipation capacity and improves, and just why the utility model requires heat-conducting block and fin will erect setting for this.
In the free convection heat transfer process, driving the mobile power of air is: the air heating temperature raises, proportion descends and the buoyancy of generation, buoyancy is directly proportional with the temperature difference (air themperature in the fin is poor with ambient air temperature) of volume and air, that is to say that the air themperature in the fin is high more, buoyancy is big more, and the natural convection air amount is also just big more.But the convection heat transfer' heat-transfer by convection of radiated rib and air but with fin temperature and fin in the difference of air themperature be directly proportional, be directly proportional with fin area (area of dissipation), and distance high (being the fin height) and fin density that air flow resistance that fin produced and air are flowed through are directly proportional, and fin height and fin density meter reveal area of dissipation.These analyze explanation, in the free convection heat transfer in the rib-type structure, increase radiating surface by increasing fin height or fin density (reducing the gap between the fin), to reach the raising heat dissipation capacity, there is factor opposite, contradiction, thereby the heat dissipation capacity raising is limited, even might be to reduce heat dissipation capacity, obtains opposite result.
Fig. 1 is the free convection heat transfer empirical curve of rib-type fin, ordinate is heat dissipation capacity Q (heat dissipation capacity when heat-conducting block and ambient air temperature difference are certain definite value), abscissa is the ratio of the gap a between high h of fin and the fin, and h/a is called as the fin characteristic parameter, and this is a dimensionless group.Because fin height and the gap between the fin in the fin are not necessarily uniform, thereby get the mean height h of fin and the ratio of the mean gap a between the fin is the fin characteristic parameter.Three curves are respectively the experimental result in three kinds of different fin gaps, wherein a among the figure
1Greater than a
2, a
2Greater than a
3
Illustrate among Fig. 1:, have the high h of a best fin when gap a one timing
*If the high h of fin is greater than h
*The time, increase the high h of fin (yet just increasing area of dissipation), not only heat dissipation capacity does not improve decline on the contrary; Has only the high h of fin of working as less than h
*The time, increase the high h of fin (increasing area of dissipation), just help improving heat dissipation capacity; Increase fin gap a helps raising and obtains maximum heat dissipation capacity, but has correspondingly strengthened fin height (being the size of fin).Draw best fin characteristic parameter (h/a) by many experimental data arrangements
*Between 5.0 to 7.0, about 6.0.
According to interpretation, and comprehensive other factors, the utility model proposes, during design LED fin, fin characteristic parameter h/a value should be not more than 10.0, is not less than 2.0, and the mean gap a between the fin is greater than 1.7mm; The fin mean height is got and is not more than 40mm, is the consideration of two aspects: one, the rib efficient aspect of fin, get 42mm as h, and (h/a) get 6.0, then gap a is 7.0mm, excesssive gap, rib efficient is low, heat transmission material (being generally aluminium) height, i.e. cost height; Two, the shared bulk of fin is big, the heat conduction distance in the heat-conducting block.Propose in the utility model, the average length of fin should be greater than 10.0mm, also is to consider from rib efficient aspect, if also have the average length of fin too small, the utility model proposes optimize structure and size due to superiority will be lowered.
The significant dimensions that fin thick (on average thick) is a fin, consider from saving material and increasing the ventilation area aspect, fin is thick should be thin as far as possible, because the intensity of free convection heat transfer is not high, even the fin thickness is to being 0.5mm, fin is long to be 20mm, adopt aluminium, analysis can draw, and fin efficiency can reach 95%, consider general employing aluminium extrusion process manufacturing fin, fin is average thick should get 0.4～1.2mm.
Fin more reasonably designs: fin characteristic parameter (h/a) is got and is not less than 3.5, is not more than 7.0, and the mean gap a between the fin should be greater than 2.2mm.
Sun fancy heat radiating fin structure: the center is a heating column, heat-conducting block just, and fin stretches out round heating column.LED core (pyrotoxin just) is arranged on the end face of heating column, and pyrotoxin is short to the distance of fin root, and then thermal conduction resistance is low, the LED core concentrates on center heating column end face, the shared area of heating column and LED core is little, and the circulation area of air is big, helps free convection heat transfer.More than heat radiation is a rational structure the most to explanation sun fancy fin for the LED core.
The utility model also proposes a kind of LED light fixture, and fin is the parts in the light fixture, and the LED core is arranged on the heat conduction core, and LED core and heat conduction core constitute the LED wick, can be designed and manufactured into the series standard parts, realizes standardization.Heat conduction core adopts pyramidal structure or bolt structure or taper bolt structure, and fin adopts sun fancy structure, and heating column has the hole that matches with preceding described heat conduction core.Fin characteristic parameter h/a value should be not more than 10.0, is not less than 2.0, and the mean gap a between the fin is greater than 1.7mm; The fin mean height is got and is not more than 40mm, and fin is average thick should get 0.4～1.2mm.
Description of drawings
Fig. 1 is the free convection heat transfer empirical curve of rib-type fin, and ordinate is heat dissipation capacity Q (heat dissipation capacity when heat-conducting block and ambient air temperature difference are certain definite value), and abscissa is the ratio of the gap a between high h of fin and the fin.
Fig. 2 is the feature schematic diagram that a kind of LED core is arranged on the LED lamp of heat-conducting block side, and a is the gap between the fin among the figure, and h is the height of fin, and arrow is represented air-flow direction.
Fig. 3 is the feature schematic diagram that a kind of LED wick is arranged on the LED lamp of heat-conducting block lower end.
Fig. 4 is that a kind of outward flange is hexagonal sun fancy fin schematic diagram.
Fig. 5 is that a kind of outward flange is the sun fancy fin feature schematic diagram of rectangle.
Fig. 6 is that a kind of outward flange is circle, and fin is the sun fancy fin feature schematic diagram of arc.
Fig. 7 is a kind of feature structure schematic diagram of fin of LED lamp of the present utility model, is pieced together by several sunflower radiating ribs, is the honeycombed structure.
Fig. 8 is a kind of feature structure schematic diagram of LED lamp of the present utility model.
Fig. 9 is a kind of feature structure schematic diagram of LED lamp of the present utility model, and the LED core is at the upside of fin.
Figure 10 is a kind of feature structure schematic diagram of LED lamp of the present utility model, is provided with speculum in the convective cover, can be to level irradiation all around.
Figure 11 is a kind of feature structure schematic diagram of LED lamp of the present utility model, is provided with speculum in the convective cover, but folk prescription shine to level, the convective cover sidewall upper has exhausting window.
Figure 12 is a kind of feature structure schematic diagram of LED lamp of the present utility model, and the LED core is provided with the wick cover.
Figure 13 is a kind of feature structure schematic diagram of LED lamp of the present utility model, and the LED core is located on the heat conduction core, and heat conduction core is that taper is implanted in the fin.
Figure 14 is a kind of feature structure schematic diagram of LED lamp of the present utility model, and heat conduction core is that screw thread is implanted in the fin, and the LED core is provided with the wick cover.
Figure 15 is a kind of feature structure schematic diagram of LED wick of the present utility model, and heat conduction core is the tapered tread structure, and band wick cover.
Figure 16 is a kind of feature structure schematic diagram of LED lamp of the present utility model, and fin has adopted favose amalgamation structure, can be used for road lighting.
Among the figure: the 1.LED core; 2. heating column; 3. fin; 4. convective cover; 5. convection current chamber; 6. the arrow of representing light; 7. speculum; 8. exhausting window; 9. heat-conducting block; 10. wick cover; 11. front lens; 12. heat conduction core; 13. screw; 14. convection current chamber grid.
The specific embodiment
LED lamp shown in Figure 2, LED core 1 is arranged on the side of heat-conducting block 9, and fin 3 stretches out from heat-conducting block 9 opposite sides, and the length L of stretching out is a fin length.Heat-conducting block 9 is setting setting among the figure, and fin 3 also is provided with for erectting, and arrow represents that air is mobile among the figure, during free convection, air passes fin 3 from bottom to top, and the high h of fin just air passes size on the fin direction, and the gap a between the fin is the space length between the two adjacent fins.
LED lamp shown in Figure 3, LED core 1 is arranged on the lower surface of heat-conducting block 9, and two fin are arranged, and the heat conduction core 12 of LED core 1 is clipped by the heat-conducting block 9 of two fin, and the heat of LED wick 1 passes on the heat-conducting block 9 by heat conduction core 12.
Fig. 4,5,6 shows the feature schematic diagram of three kinds of sun fancy fin respectively.Their architectural features (heronsbill architectural feature just), heat-conducting block is exactly that (heating column has solid and hollow branch for the heating column 2 at center, be solid among the figure), fin 3 stretches out from the cylinder of heating column 2, the effect of heating column by the end face (also can claim cross section) of the heating column mode with heat conduction, is passed to the heat of LED core on the fin on the cylinder.The advantage of heronsbill structure: thermal conduction portions (being heating column) volume is little, and sectional area is little, and thermally conductive pathways is short.
The heat dissipation capacity of single sunflower radiating rib is limited, and the power (being illuminance) of corresponding single led core is also just limited, for this class high-power illumination lamp of picture street lamp, can adopt similar scheme shown in Figure 7.Adopt many sun of number fancy fin to piece together one by jockey or interconnection mechanism, each sunflower radiating rib has the LED core, and this just can piece together the illuminating lamp of multiple illuminance (power) as required.Hexagonal external feature such as single sun fancy fin shown in Figure 7 is, entire heat dissipation sheet amalgamation structure is the honeycomb type structure.
Convective cover is set above fin, utilizes chimney suction principle, improve the flow through flow of fin of air, obtain the raising of heat dissipation capacity.Dischargeable capacity in the suction intensity of convective cover and the convective cover is directly proportional, and apparent size shows as with the height of convective cover and is directly proportional.
Fig. 8,9 illustrates the feature structure of the LED lamp of two kinds of typical band convective covers.LED core 1 among Fig. 8 is arranged on the lower surface (downside of fin) of heating column 2, LED core 1 among Fig. 9 is located at the upper surface (upside of fin) of heating column 2, but their common characteristic are provided with convective cover 4 above fin, above fin, form cavity, become convection current chamber 5.The height of convective cover 4 (height that just refers to convection current chamber 5) is high more, and the volume in convection current chamber 5 is just big more, and the suction that is produced is strong more, and the air mass flow of the fin 3 of flowing through is also just big more, and heat dissipation capacity just obtains improving.It is enough high that convective cover is wanted, and could obviously improve heat radiation, and during design, the convective cover height should be not less than 40mm.
After being added with convective cover, the free convection heat transfer characteristic of rib-type fin is also keeping characteristic shown in Figure 1, and heat dissipation capacity Q has promoted, but best fin characteristic parameter (h/a)
*Still about 6.0, between 5.0～7.0.Design is during fin, (h/a) also should get and be not more than 10.0, be not less than 2.0, and gap a is greater than 1.7mm, and the high h of fin gets and is not more than 40mm, and fin is thick also should get 0.4～1.2mm.More rational design is still: (h/a) get greater than 3.5, be not more than 7.0, gap a is greater than 2.2mm.
The convective cover height gets that 120mm, fin length get 25mm, high h gets 17mm, gap a gets the sun fancy fin of 2.8mm, the average thick 0.65mm of getting of fin, when heating column and the surrounding air temperature difference are 30 ℃, can obtain the level of every watt of heat transmission aluminium less than 4 grams, compare with the aluminium level with existing every watt more than 100 gram of product, the horizontal highly significant that the utility model improves, we can say: LED heat radiation cost should not considered again.
When fin keeps flat, convective cover is erect when being provided with, and the swabbing action of convective cover is the most effective, but the LED core only faces upward or downward.The utility model LED lamp shown in Figure 10,11, just solved light flat fire problem, LED core 1 is arranged on the upside of fin, LED core 1 is provided with speculum 7 up in the convective cover 4, the sidewall of convective cover 4 has adopted transparent material to make, from LED core 1 send towards glazed thread, be reflected into flat fire through speculum 7,, then just can transfer the flat fire angle (on the upper side or on the lower side) of illuminating lamp if the adjustable angle of the speculum 7 in the convective cover 4 is moving.LED illuminating lamp shown in Figure 11 is one-sided flat fire, and shown in Figure 10 be both sides, or flat fire all around.Among Figure 11, be added with lid on the convective cover 4, have exhausting window 8 in sidewall upper.
In two kinds of LED illuminating lamps of the present utility model shown in Figure 13,14, heat conduction core 12 is arranged in the heating column, and LED core 1 is arranged on the heat conduction core 12, and heat conduction core 12 is implanted in the fin, heat conduction core is the part in the heating column, and the heat that LED core 1 produces is transmitted on the fin through heat conduction core 12 again.
Figure 13,14 shows the thermal contact resistance problem that solves between heat conduction core 12 and the fin (heating column).Shown in Figure 13, heat conduction core 12 is taper.Adopt taper to implant structure in the fin, as long as little pushing force, just can obtain being exaggerated the pressure that contacts between tens of times heat conduction core cylinder and the fin, help reducing thermal contact resistance.Conical bore and the easy machine-shaping of circular cone cylinder, quality of fit guarantees easily, thereby heat conduction core that should first-selected conical structure.Shown in Figure 13, heat conduction core 12 is by rotary screw 13, in heat conduction core 12 fastening implantation fin.
Figure 14 illustrates the structure that heat conduction core 12 adopts in the screw thread implantation fin (heating column), because the surface area of screw thread cylinder is exaggerated, the transmission of heat by contact area just is exaggerated, and such as adopting 60 ° of common trigonodont screw threads, its surface area is the twice of cylinder.The structure that heat conduction core adopts screw thread to implant in the fin also has an advantage: be convenient to install, can just heat conduction core can be implanted in the fin by tool free.LED core 1 among Figure 14 has wick cover 10 and front lens 11, and front lens 11 concavities make the lower limb of wick cover 10 be lower than front lens 11.
Figure 15 shows a kind of LED lamp of the present utility model, and heat conduction core 12 has adopted the tapered tread structure, thereby has the advantage sum that conical structure and helicitic texture are had: it is big to contact pressure, and contact area is big, is convenient to install.
Adopt structure shown in Figure 13 to 15, LED core 1 and heat conduction core 12 can constitute separate part---and the LED wick, adopt such structural advantages to have: one, to be convenient to the encapsulation and the assembling of LED core 1 and heat conduction core 12, to be convenient to solve the heat conduction problem in it; Two, be convenient to the assembling of whole LED lamp; Three, be convenient to the maintenance and the replacing of LED wick; Four, the more important thing is and be convenient to realize standardization.The LED wick is the series standard universal component, fin separates with the LED wick, fin is the parts in the light fixture, as long as the heating column of fin has the hole that the LED heat conduction core with pyramidal structure or bolt structure or taper bolt structure matches in the light fixture, just can realize that standard LED wick and light fixture various in style match.
Figure 16 shows a kind of employing street lamp of the present utility model, and fin is 10 and waits hexagon sun fancy fin to piece together.Heat conduction core 12 has adopted the tapered tread structure, and each LED core 1 has wick cover 10 and front lens 11, front lens 11 concavities, and the rear casing projection of lamp has constituted convective cover 4, and internal cavity is exactly the convection current chamber, and top cover has the exhausting window of being made up of the many apertures of number 8.In the convection current chamber, be provided with convection current chamber grid 14, the convection current chamber is divided into a plurality of little sub-convection current chambeies of number, the corresponding fin in each sub-convection current chamber (also can corresponding a plurality of fin), its objective is: eliminate the interference between (or reducing) each fin, broken such as the LED lamp on certain fin, do not generate heat, then only influence the air themperature in the pairing sub-convection current of this fin chamber, and do not influence the air themperature (being suction capactity) in other sub-convection current chambeies.
Specify: the LED core in the utility model has comprised the OLED core.
Claims (10)
1. LED lamp, include fin and LED core (1), fin includes heat-conducting block (9) and fin (3), fin (3) stretches out from heat-conducting block (9) side, fin stretches out average length greater than 10mm, heat-conducting block (9) is erects setting up and down, fin (3) also is erects setting, the heat radiation air passes fin (3) from bottom to top, LED core (1) is arranged on upper end or the lower end or the side of heat-conducting block (9), it is characterized in that: the ratio of the mean gap between fin mean height and the fin is not more than 10.0, is not less than 2.0; The mean height of fin is not more than 40mm, and the mean gap between the fin is greater than 1.7mm.
2. LED lamp according to claim 1 is characterized in that: the ratio of the mean gap between fin mean height and the fin is not more than 7.0, is not less than 3.5, and the mean gap between the fin is greater than 2.2mm.
3. LED lamp according to claim 1 is characterized in that: the top of fin is provided with convective cover (4).
4. LED illuminating lamp according to claim 3 is characterized in that: LED core (1) is arranged on the upside of fin, LED core (1) up, convective cover (4) sidewall has adopted transparent material to make, and is provided with speculum (7) in the convective cover (4).
5. LED lamp according to claim 1 is characterized in that: LED core (1) is provided with wick cover (10), and wick cover (10) lower limb or lower limb projection are lower than the front lens (11) of LED core.
6. LED light fixture, the LED light fixture includes fin, it is characterized in that: the fin center of having adopted is heating column (2), the sun fancy structure that fin (3) stretches out round heating column (2); The ratio of the mean gap between fin mean height and the fin is not more than 10.0, be not less than 2.0, the fin mean height is not more than 40.0mm, and the mean gap between the fin has the hole that the LED heat conduction core (12) with pyramidal structure or bolt structure or taper bolt structure matches greater than 1.7mm heating column (2).
7. LED light fixture according to claim 6 is characterized in that: the ratio of the mean gap between fin mean height and the fin is not more than 7.0, is not less than 3.5, and the mean gap between the fin is greater than 2.2mm.
8. LED light fixture according to claim 6 is characterized in that: the top of fin is provided with convective cover (4), and the convective cover height is not less than 40mm.
9. LED light fixture according to claim 6 is characterized in that: fin is that the fin assembly unit by several sun fancy structures constitutes.
10. LED light fixture according to claim 6 is characterized in that: fin is that the fin assembly unit by several sun fancy structures constitutes, and the top of fin is provided with convective cover (4), is provided with convection current chamber grid (14) in the convective cover (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201965771U CN201748364U (en) | 2010-05-18 | 2010-05-18 | Light emitting diode (LED) lamp with optimized heat dissipation and light fitting thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201965771U CN201748364U (en) | 2010-05-18 | 2010-05-18 | Light emitting diode (LED) lamp with optimized heat dissipation and light fitting thereof |
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| CN201748364U true CN201748364U (en) | 2011-02-16 |
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| CN2010201965771U Expired - Fee Related CN201748364U (en) | 2010-05-18 | 2010-05-18 | Light emitting diode (LED) lamp with optimized heat dissipation and light fitting thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825240A (en) * | 2010-05-18 | 2010-09-08 | 秦彪 | Heat dissipation-optimized LED (light-emitting diode) lamp and light fitting thereof |
| WO2012171150A1 (en) * | 2011-06-11 | 2012-12-20 | 东莞勤上光电股份有限公司 | Vertical convection radiator and vertical convection radiating cylinder lamp |
| CN103807830A (en) * | 2012-11-06 | 2014-05-21 | 秦彪 | Cost-optimized LED (light-emitting diode) radiating fin and LED lighting lamp |
-
2010
- 2010-05-18 CN CN2010201965771U patent/CN201748364U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825240A (en) * | 2010-05-18 | 2010-09-08 | 秦彪 | Heat dissipation-optimized LED (light-emitting diode) lamp and light fitting thereof |
| CN101825240B (en) * | 2010-05-18 | 2016-10-05 | 秦彪 | LED and light fixture thereof |
| WO2012171150A1 (en) * | 2011-06-11 | 2012-12-20 | 东莞勤上光电股份有限公司 | Vertical convection radiator and vertical convection radiating cylinder lamp |
| CN103807830A (en) * | 2012-11-06 | 2014-05-21 | 秦彪 | Cost-optimized LED (light-emitting diode) radiating fin and LED lighting lamp |
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Granted publication date: 20110216 Termination date: 20130518 |