• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Lighting device (2) comprising one or more light generating units (4) and a transparent portion (6) which light (5) generated by said units is intended to pass, the lighting device (2) further comprises a heating system (8) intended to conduct heat generated of the light generating unit (s) (4) with heat transfer medium (12) to the transparent portion (6) for heating the same. The heating system (8) comprises a conduit arrangement (10) arranged in direct connection to said transparent portion (6) and containing said heat transfer medium (12), the heating system (8) being a closed system where narrowing and condensation of the heat transfer medium (12) takes place, and that the heat generated in connection with the condensation is used for direct heating of said transparent portion (6). (Figure 1)
    公开号:SE1251074A1
    申请号:SE1251074
    申请日:2012-09-24
    公开日:2014-03-25
    发明作者:Hans Wikström
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    101520252be used to efficiently conduct heat, for example from electronics in computers, throughto move heat from one end of the pipe to the other where it may be largerability to cool efficiently in the normal way. A heat-pipe system is also used forto transport heat from vacuum tube solar collectors to waterborneheat conduction system. In a heat-pipe system, the heat can only be transported in onedirection from below where the liquid is gasified upwards where the gas condenses to flowalong the inside of the tube down and gasified again.
    A typical heat-pipe system consists of a closed pipe made of a material withhigh thermal conductivity, such as copper or aluminum. The pipeevacuated and a suitable heat transfer medium is partially filled. The means haveselected with regard to the application of the system. Examples of media arewater, ethanol, acetone, or mercury. According to this type of heat-pipe system hasthe pipes on the inside are provided with a material which has a capillary pressure for itthe selected media. It may, for example, be a sintered metal powder oralso grooves in the length of the pipe. Independent design is the purpose to exploitthe capillary force to return the condensed medium back to the heated onethe end. In some cases, gravity can instead be used to return itcondensed medium and it can also be returned via a separate tube, instead ofthe tube which transmits the vaporized medium. A heat-pipe system contains nonemoving parts and typically requires no maintenance.
    The materials selected as heat transfer medium depend, as mentioned abovethe operating temperatures that are relevant for a specific application. For examplemethanol has an operating temperature range of 283-403 K, and ethanol onetemperature range of 273-403 K. Also different so-called freons may be appropriate touse.
    The object of the present invention is to provide an improved and simplifiedlighting device with respect to reducing fogging and icing onthe transparent, light-transmitting portion.1015202530Summary of the InventionThe above object is achieved by the invention defined by the independentthe patent claim.
    Preferred embodiments are defined by the dependent claims.
    According to the invention, the heat is conducted from the light emitting unit, e.g. LEDthe socket of the lamp, using the so-called heat-pipe principle, to ittransparent portion (lens) of the lighting device. This is accomplishedby allowing a suitable heat transfer medium (liquid / gas) to evaporate aroundthe hot base and passed in a first line to the upper edge of the transparentthe party. There, the steam is conducted in mainly vertical channels during condensation, andthus heat dissipation, downwards. The liquid is then led back to the hot onethe base, preferably by means of a capillary material in a second conduit where itevaporated again. This conducts heat from the hot base to the lenswhich then heats up and prevents fogging and snow and ice from forming on the lens.
    The circulation is maintained, according to one embodiment, by means of gravity andcapillary force. Thus, no active regulation in the form of, for example, one is requiredpump or fan to circulate the heat transfer medium.
    Short drawing descriptionFigure 1 is a schematic side view of a lighting device according to the present inventioninvention.
    Figure 2 is a schematic side view of a lighting device according to the present inventioninvention showing different embodiments.
    Figure 3 is a front view of a lighting device according to an embodiment ofpresent invention.
    Figure 4 shows a cross section of the transparent portion according to an embodiment ofpresent invention.
    Figure 5 shows a cross section of the transparent portion according to another embodimentof the present invention.10152025304Figure 6 is a schematic side view of yet another embodiment of the present inventioninvention.
    Figure 7 is a schematic side view of a lighting device according to anotherembodiment of the present invention.
    Detailed Description of Preferred Embodiments of the InventionThe invention will now be described in detail with reference to the accompanyingthe figures. In the figures, the same reference numerals have been used todenote details with the same or similar function.
    Figure 1 is a schematic side view of a lighting device 2 comprising oneor several light generating units 4, preferably arranged in a housing (not shown) anda transparent portion 6 through which light generated by said units is intended to pass.
    The light-generating units are, for example, LED lighting andthe lighting device is preferably a vehicle lighting.
    The lighting device 2 further comprises a heating system 8 intended toconducting heat generated by the light generating unit or units 4 by oneheat transfer medium 12 to the transparent portion 6 for heatingthis.
    The heating system 8 comprises a conduit arrangement 10 arranged in directconnection to the transparent portion 6 and containing saidheat transfer medium 12, the heating system 8 being a closed onesystems where evaporation and condensation of the heat transfer medium 12happens. In the figures, the medium in the vapor phase has been denoted by dashed arrows and inliquid phase with solid arrows. The heat generated in connection withthe condensation is used for direct heating of said transparent portion 6.
    In other words, the heating system 8 operates according to the so-called heat pipethe principle. As mentioned, the figures are schematic and have been simplified toillustrate the invention as clearly as possible, for example there are of course oftensome form of housing (lamp housing) that supports the components.10152025305The conduit arrangement is thus adapted so that the heat transfer mediumdirectly heats the transparent portion.
    Pipe arrangement 10 comprises, for example, conduit channels 11 as toexamples may be one or more separate tubes.
    According to one embodiment, the conduit arrangement 10 is arranged on the inside thereoftransparent portion 6. This is schematically illustrated in Figure 1.
    According to another embodiment, the conduit arrangement 10 is arranged on the outsideof the transparent portion 6. This is schematically illustrated in Figure 5.
    According to a further embodiment, the conduit arrangement 10 is arranged so thatit is integrated in the transparent portion 6. This is schematically illustrated in Figure 4.
    In this case, when the conduits are formed in the transparent portion, none are requiredseparate pipes without the ducts may have been formed in connection with the manufactureof the transparent portion, for example by the transparent portionmanufactured by joining two layers that are laminated together therethe channels are formed by depressions in the respective layers which are fitted so thatthese form channels at the junction. It is also possible to soundthe conduits consist of tubes cast into the transparent portion.
    Another alternative is to let the transparent party consist of onedouble wall structure, ie. two transparent walls with a gap between the wallswhere the heat transfer medium passes.
    For the other two variants, ie. where the management arrangement is located on the outsideor the inside of the transparent portion, the conduits are formed by one or moreseparate pipes.10152025306For all locations of the line arrangement, the line channels applycan be likened to a network that is arranged so that it is evenly distributed across ittransparent portion to thereby evenly distribute the heat.
    The conduit can, for example, have a circular cross-section. However, others havecross sections have been found to be advantageous where the surface faces the part of the transparentthe party that is to be heated the most, ie. outside, is larger. This can be achievedfor example by designing the channel with a cross section that is an isosceles or equilateraltriangle where the tip of the triangle is directed towards the outside. Another option is to letthe cross section be a semicircle, where the arc of the circle is directed towards the outside.
    The conduits in the transparent portion must be designed so that the light imageaffected as little as possible. This means, for example, that the line channels havea maximum outer diameter that is relatively small, on the order of somemillimeter.
    The heating system 8 comprises a heat absorption part 14 arranged inconnection to said light generating units 4 and containing saidheat transfer medium 12. The purpose of the heat absorption part is to encloseparts of the light generating unit 4, for example a socket for this, so that itthe heat transfer medium can absorb as much heat as possible from itlight generating unit 4. The heat absorption part 14 is a closed container onlyconnected to at least a first conduit 16 adapted to conduct the saidheat transfer medium 12 from the heat absorption part 14 toThe conduit arrangement 10, and to at least one second conduit 18 adapted todirecting said heat transfer medium 12 from the conduction arrangement 10back to the heat absorption part 14.
    The first conduit 16 is preferably made of a low materialthermal conductivity because as much of the heat as possible must be given off tothe transparent party and not lost along the way. By being completely or partiallyinsulate all or part of the outside of the first conduit 16 with an insulator10152025307layer 20, see the embodiment shown in figure 2, the heat dissipation from it is reducedfirst management further.
    In connection with the heat transfer medium condensing, additional heat is given offthe transparent party. The management arrangement is so arranged that itthe condensed medium is moved downwards along the transparent portion thanks togravity. Figure 3 shows the lighting device from the front thereThe vertical extent of the ducts has been marked.
    To then return the medium, to the heat transfer part 14 comprises the otherthe conduit 18 a capillary conductive material 22, as is apparent from that embodimentas shown in Figure 2. The capillary conductive material may, for example, beany kind of metal wool or felt-like metal material. The reason why oneCapillary conductive material needed here is that the lower part of the transparentthe portion 6 is located below the heat transfer part 14.
    A capillary conductive material can also be integrated into the conduit arrangement thereintransparent part which has the advantage that the conduits then do not needbe vertically oriented but can be given a suitable orientation to achieve optimaleffect. They can, for example, be arranged in suitable loops to thereby cover soas much of the surface as possible.
    Figure 6 shows a schematic side view of an embodiment where no capillary conductancematerial is required because the heat transfer member 14 is located below itthe lower part of the transparent portion and thereby the medium flows down tothe heat transfer part thanks to gravity. Such a design ofthe lighting requires, for example, a mirror arrangement (not shown) to get the light out.
    The background part of the description indicated a number of media that can function asheat transfer medium depending on which application, in this case whichtemperatures present at the light generating unit. For LED lamps appliesthat the working temperature is in the range of 60-90 degrees Celsius.1015208For example, the heat transfer medium 12 may be butane or propane.
    If the heat generation from the light generating unit is not sufficient toto remove mist on the lens, additional heat can be added to the base of the unitfor example with the help of electricity, hot coolant, hot charge air or exhaust gases.
    Finally, Figure 7 shows a schematic side view of a lighting device according toa further embodiment of the present invention.
    According to this embodiment, a combined line 24 is used, i.e. only oneconduit, to transfer the heat transfer medium to and from the transparentthe portion 6. The combined conduit 24 is preferably provided with onecapillary conductive material 22 and also with an insulating layer 20. IIn the embodiment shown in Figure 7, the conduit arrangement has been arranged oninside the transparent portion 6, it is of course possible to leave itintegrated in, or be located on the outside of the lot 6.
    What has been described above in connection with other embodiments is of courseapplicable, if technically possible, also to the embodiment shown in Figure 7.
    The present invention is not limited to the above-described preferredembodiments. Various alternatives, modifications and equivalents can be used.
    The above embodiments should therefore not be construed as limitingthe scope of the invention as defined by the appended claims.
    权利要求:
    Claims (16)
    [1]
    Lighting device (2) comprising one or more light generating units (4) and a transparent portion (6) to which light (5) generated by said units is intended to pass, the lighting device (2) further comprising a heating system (8) intended to conduct heat generated by the light generating unit (s) (4) with a heat transfer medium (12) to the transparent portion (6) for heating the same, characterized in that the heating system (8) comprises a conduit arrangement (10) arranged in direct connection to said transparent portion (6) and containing said heat transfer medium (12), the heating system (8) being a closed system where narrowing and condensation of the heat transfer medium (12) takes place, and that the heat generated in connection with the condensation is used for direct heating of said transparent portion (6).
    [2]
    The lighting device according to claim 1, wherein said conduit arrangement (10) comprises conduits (11).
    [3]
    The lighting device according to claim 1 or 2, wherein said conduit arrangement (10) is arranged on the inside of the transparent portion (6).
    [4]
    The lighting device according to any one of claims 1-3, wherein said conduit arrangement (10) is arranged on the outside of the transparent portion (6).
    [5]
    The lighting device according to any one of claims 1-4, wherein said conduit arrangement (10) is arranged integrated in the transparent portion (6).
    [6]
    The lighting device according to any one of claims 1-5, wherein the heating system (8) comprises a heat absorption part (14) arranged in connection with said light generating units (4) and containing said heat transfer medium (12), at least a first conduit (16) adapted to directing said heat transfer medium (12) from said heat receiving member (14) to said conduit arrangement (10), and at least one second conduit (18) adapted to guide said heat transfer medium (12) from said conduit arrangement (10) back to said heat absorption part (14).
    [7]
    The lighting device according to claim 6, wherein said first conduit (16) is made of a material with low thermal conductivity.
    [8]
    The lighting device according to claim 6 or 7, wherein said first conduit (16) is completely or partially insulated with an insulating layer (20).
    [9]
    The lighting device according to any one of claims 6-8, wherein said second conduit (18) comprises a capillary conductive material (22).
    [10]
    The lighting device according to any one of claims 1-5, wherein the heating system (8) comprises a heat absorption part (14) arranged in connection with said light generating units (4) and containing said heat transfer medium (12), and a combined conduit (24) adapted to conducting said heat transfer medium (12) between said heat receiving member (14) and said conduit arrangement (10).
    [11]
    The lighting device according to claim 10, wherein said combined conduit (24) is completely or partially insulated with an insulating layer (20).
    [12]
    The lighting device of claim 10 or 11, wherein said combined conduit (24) comprises a capillary conductive material (22).
    [13]
    The lighting device according to any one of claims 1-12, wherein the heating system (8) operates according to the heat-pipe principle.
    [14]
    The lighting device according to any one of claims 1-13, wherein the heat transfer medium (12) is butane or propane. ll
    [15]
    The lighting device according to any one of claims 1-14, wherein said one or more light generating units (4) is an LED lighting.
    [16]
    The lighting device according to any one of claims 1-15, wherein said lighting device is a vehicle lighting.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102006010977A1|2006-02-01|2007-12-06|Osram Opto Semiconductors Gmbh|Motor vehicle headlight|
    JP2008135260A|2006-11-28|2008-06-12|Matsushita Electric Ind Co Ltd|Headlamp for vehicle|
    CN101358699B|2007-08-01|2011-08-24|富士迈半导体精密工业（上海）有限公司|Outdoor lamp|
    DE102007038911A1|2007-08-17|2009-02-19|Osram Gesellschaft mit beschränkter Haftung|Cooling device and lighting device|
    EP2229555B1|2008-01-14|2011-11-02|Osram AG|Arrangement for cooling semiconductor light sources and floodlight having this arrangement|
    DE112008003616T5|2008-01-17|2011-06-09|Mitsubishi Electric Corp.|Vehicle headlamp|
    BRPI1006412A2|2009-02-27|2019-09-24|Koninl Philips Electronics Nv|"Lamp and method for dissipating the heat of a lamp LED light source through an optically transmissive lamp element"|DE102014009628A1|2014-06-27|2015-08-13|Daimler Ag|Outdoor light for a vehicle|
    DE102014219207A1|2014-09-23|2016-03-24|Osram Gmbh|Heat pipe light conversion device and semiconductor light emitting device with light conversion device|
    US11104451B2|2020-01-17|2021-08-31|B/E Aerospace, Inc|Systems and methods for mitigating condensation in aircraft lighting|
    法律状态:
    优先权:
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    EP13185134.7A| EP2711625B1|2012-09-24|2013-09-19|Light apparatus|
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