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CN100572908C - 发光二极管灯具 - Google Patents

发光二极管灯具 Download PDF

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Publication number
CN100572908C
CN100572908C CNB2006101569142A CN200610156914A CN100572908C CN 100572908 C CN100572908 C CN 100572908C CN B2006101569142 A CNB2006101569142 A CN B2006101569142A CN 200610156914 A CN200610156914 A CN 200610156914A CN 100572908 C CN100572908 C CN 100572908C
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heat pipe
type heat
led lamp
pulsation type
radiator
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CN101191611A (zh
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张长生
刘睿凯
王肇浩
白先声
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Hong Jun Precision Industry Co ltd
Fuzhun Precision Industry Shenzhen Co Ltd
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Hong Jun Precision Industry Co ltd
Fuzhun Precision Industry Shenzhen Co Ltd
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Priority to US11/684,461 priority patent/US7547124B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/51—Cooling arrangements using condensation or evaporation of a fluid, e.g. heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
    • F21V29/717—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements using split or remote units thermally interconnected, e.g. by thermally conductive bars or heat pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0275—Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/505—Cooling arrangements characterised by the adaptation for cooling of specific components of reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S362/00—Illumination
    • Y10S362/80—Light emitting diode

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

一种发光二极管灯具，包括基板、发光二极管灯泡、散热器及脉动式热管，所述发光二极管灯泡电连接至基板上，该脉动式热管内设有脉管，该脉管内设有中空通道，该脉动式热管同时与该发光二极管灯泡及散热器热连接，使发光二极管灯泡产生的热量能够经由该脉动式热管传递至散热器进行散发，上述发光二极管灯具中的脉动式热管的热阻小，散热效果佳，且制造成本低，易量产。

Description

发光二极管灯具
技术领域
本发明是涉及一种发光二极管灯具，特别是涉及一种结合有散热结构的发光二极管灯具。
背景技术
随着科学技术的不断进步以及人们节能意识的不断提高，发光二极管(light emitting diode，LED)由于具有体积小、效率高等优点而逐渐被广泛应用于照明领域中。
目前，发光二极管灯具受限于其发光特性，当其工作温度过高时会产生色变、光衰的现象，且其寿命大幅缩减，因此，如何将发光二极管灯具的工作温度保持在一定范围内以避免上述现象的发生，是人们目前急需解决的问题。现有的发光二极管灯具一般采用传统的铝制散热器进行散热，此种散热方式仅适用于小功率的发光二极管灯具散热；在发光二极管灯具的功率较大的情形下，一般采用普通热管(heat pipe)、回路热管(loop heat pipe)、均热板(vapor chamber)等传热元件，以自身自然冷却或搭配散热器的方式对发光二极管灯具进行散热，但这些传热元件单位面积的热通量(heat flux)较小，在热传量过大时有可能会出现干涸(dry out)的现象，导致发光二极管灯具的散热效果不甚理想，且一般回路热管、均热板的制造成本也过高，量产性不易，因此需加以改进。
发明内容
有鉴于此，有必要提供一种散热效果较佳且成本亦较低廉的发光二极管灯具。
一种发光二极管灯具，包括基板、发光二极管灯泡、散热器及脉动式热管，所述发光二极管灯泡电连接至基板上，该脉动式热管内设有脉管，该脉管内设有中空通道，该脉动式热管同时与该发光二极管灯泡及散热器热连接，使发光二极管灯泡产生的热量能够经由该脉动式热管传递至散热器进行散发。
一种发光二极管灯具，包括散热器、脉动式热管及至少一发光二极管灯泡，该脉动式热管内设有脉管，该脉管内设有中空通道，该脉动式热管连续弯折形成为多重U型管体的组合，该脉动式热管的其中一部分区域形成为蒸发区，另一部分区域形成为冷凝区，所述发光二极管灯泡连接至该脉动式热管的蒸发区，所述散热器连接于该脉动式热管的冷凝区，使所述发光二极管灯泡产生的热量经由该脉动式热管传递至散热器进行散发。
与现有的发光二极管灯具相比，上述发光二极管灯具中的脉动式热管的热阻小，使其单位面积热通量较大，且当热传量越大时热阻越小，可降低热管干涸现象的发生，有利于提高发光二极管灯具的散热效果，且脉动式热管的制造成本较低、易量产。
附图说明
图1A为本发明发光二极管灯具第一较佳实施例的剖面示意图。
图1B为图1A所示发光二极管灯具中基板与脉动式热管结合的平面视图。
图1C为本发明发光二极管灯具第二较佳实施例的剖面示意图。
图1D为本发明发光二极管灯具第三较佳实施例的剖面示意图。
图2为图1B所示发光二极管灯具中的脉动式热管的内部结构示意图。
图3为图2所示脉动式热管中圈III部分的放大示意图。
图4为图2所示脉动式热管沿IV-IV线的剖视图。
图5为图2所示脉动式热管另一实施例的内部结构示意图。
图6A为本发明发光二极管灯具第四较佳实施例的剖面示意图。
图6B为图6A所示发光二极管灯具中基板与脉动式热管结合的平面视图。
图7A为本发明发光二极管灯具第五较佳实施例的正面示意图。
图7B为图7A所示发光二极管灯具的俯视图。
图8A为本发明发光二极管灯具第六较佳实施例的正面示意图。
图8B为图8A所示发光二极管灯具的俯视图。
图9A为本发明发光二极管灯具第七较佳实施例的正面示意图。
图9B为图9A所示发光二极管灯具结合散热鳍片后的俯视图。
图9C为图9B所示发光二极管灯具移去基板后的俯视图。
图9D为图9B所示发光二极管灯具移去基板后的另一实施例的俯视图。
具体实施方式
下面参照附图结合实施例对本发明作进一步说明。
图1A至图1B所示为本发明发光二极管灯具10的第一较佳实施例，该发光二极管灯具10包括一基板(substrate)11、电连接至该基板11上的若干发光二极管灯泡13、用于传热的一脉动式热管15、一灯罩17及一散热器19。
该散热器19的作用是将脉动式热管15从发光二极管灯泡13传递的热量进行及时的散发，本发明中对该散热器19的形状及结构不作任何限制。本实施例中，该散热器19包括一平板型的基座192及由该基座192向上伸出的若干散热鳍片191。
该基板11为由导热性良好的材料制成的电路基板，并可内设金属材料(metal based)以增加导热性能，比如采用金属芯印制板(metal core printed circuitboard，MCPCB)等。
该脉动式热管15设于基板11与散热器19的基座192之间，以将基板11与脉动式热管15及散热器19三者热连接，该灯罩17可采用与散热器19的基座192一体成型的方式，该灯罩17也可由导热性能良好的材料制成，并可在灯罩17的表面上直接设置散热鳍片等散热结构以代替散热器19或者作为对散热器19的进一步增强散热。该灯罩17大致呈杯状，其中间形成收容基板11与发光二极管灯泡13的一收容空间173，该灯罩17的内壁具有反光与聚光作用，其上设有一开口172，该发光二极管灯泡13发出的光经灯罩17反射并聚光后由该开口172射出。本发明对灯罩17的形状及设置位置不作限制，如图1C所示之第二较佳实施例中，灯罩17可设于基板11、发光二极管灯泡13、脉动式热管15及散热器19组成的系统的外围，如图1D所示之第三较佳实施例中，该灯罩17上也可对应散热器19的散热鳍片191设穿孔(图未示)，以使该散热器19的散热鳍片191通过所述穿孔穿设于灯罩17之外。
图2至图4为图1B所示脉动式热管15的示意图，该脉动式热管15为平板型以与散热器19的基座192相匹配，其包括一连续弯折的细长毛细管151、一可挠性编织脉管152以及适量可冷凝的工作流体153(如图3所示)，该脉管152置于该毛细管151内，该工作流体153填充于该毛细管151与脉管152内。该毛细管151的内壁为平滑表面，其通过连续弯折而形成为多重U型管体组合。
在本实施例中，该毛细管151形成封闭的回路型(close loop)，其具有若干直线形的吸热段154及于两端弯折形成的若干U型的放热段155，这些吸热段154与放热段155间隔设置，所述吸热段154设于图中虚线所示的吸热区H并与发光二极管灯泡13的基板11相对应，所述放热段155设于图中虚线所示的两个放热区C并与散热器19的基座192热连接，如图1B与图2所示，本实施例中的脉动式热管15的吸热区H位于中间，而其放热区C则位于两端。该毛细管151相互连通形成一封闭式的回路型通道，以供该工作流体153于其中流动。该毛细管151的两端也可间隔开并各自密封，以形成如图5所示的一开路型通道(open loop)。
该毛细管151于一端的放热区C设有一填充管158，当该毛细管151内被抽至真空后，适量的工作流体153由填充管158填充至该毛细管151内，由于该毛细管151的管径足够小，该工作流体153在毛细管151的毛细作用力下，于毛细管151内形成间隔分布的若干液柱156，同时，每相邻的两液柱156之间形成汽柱(汽泡)157，即液柱156与汽柱157间隔分布，使该工作流体153受热后在毛细管151内作往复的振荡运动。
另，在回路型的脉动式热管15中，还可设置一个或多个小型的压敏单向阀159(如图2所示)，以使该工作流体153在毛细管151内沿一特定的方向循环，当设置多个单向阀159时，工作流体153的循环将变得强烈而又迅速。
该脉管152为一细长管，其贴附于该毛细管151的内壁，并沿其长度方向设于整个毛细管151内(如图2所示)，该脉管152也可分为若干小段，并分布于毛细管151的部分区域(如图5所示)。该脉管152由若干可挠性细线160编织而成，该细线160可为纤维、纤维束、铜丝或不锈钢丝等。如图4所示，该脉管152为中空状，其具有一环形的横截面，以于脉管152内部形成一中空通道161，同时，该脉管152的外径小于该毛细管151的内径，使该脉管152的外壁与毛细管151的内壁之间形成供汽柱157与液柱156流动的间隙162，该中空通道161与间隙162可供工作流体153的储存与输送。该脉管152的编织管壁形成毛细结构，并产生毛细力以促使工作流体153在毛细管151内流动。
上述发光二极管灯具10中，发光二极管灯泡13产生的热量通过基板11传至脉动式热管15的吸热区H的各吸热段154，位于吸热段154内的液柱156吸热蒸发，导致汽柱157膨胀，同时产生蒸气压力推动液柱156经毛细管151内的间隙162以及脉管152内的中空通道161向放热区C的各放热段155流动，在这些放热段155处释放热量冷凝为液体，使放热区C处的汽柱157的体积缩小，产生负向压力，即吸引力，蒸气压力与吸引力共同作用形成作用于液柱156的推动力。由于毛细管151为连续弯折状且其内的液柱156与汽柱157交错分布，因而使汽、液柱157、156在毛细管151内产生强烈的往复振荡运动，若通过设置单向阀165，则可使该往复振荡形成单向运动，在振荡运动过程中，该工作流体153从吸热段154吸收热量到放热段155释放热量，释放的热量传至散热器19上，并散发到周围的空气中。通过这种方式，工作流体153在脉动式热管15内反复蒸发、冷凝，不断地吸热、放热，从而通过工作流体153的相变化作用而达到良好的热交换的目的。
与现有的发光二极管灯具相比，上述发光二极管灯具10中的脉动式热管15的热阻小，使其单位面积的热通量较大，且当热传量越大时热阻越小，可降低热管干涸(dry out)现象的发生，有利于提高发光二极管灯具10的散热效果，且脉动式热管15采用平滑毛细管，制造成本较低、易量产，另，上述脉动式热管15竖直放置时，其脉管152的管壁产生的毛细力可驱使工作流体153在毛细管151内流动，以使该脉动式热管15的抗重能力较强，可搭配不同的应用条件，解决抗重力的问题，从而进一步提高发光二极管灯具10的散热效果及运用范围。
另外，该基板11的位置也不是固定不变的，如图6A至图6B所示，为本发明发光二极管灯具60的第四较佳实施例，该发光二极管灯具60与第一较佳实施例中的发光二极管灯具10的不同之处在于：该基板11设于脉动式热管15的一端，在这种情形下，该脉动式热管15靠近该基板11的一端形成为吸热区M，其另一端则形成为放热区N。
当然，本发明发光二极管灯具也不仅仅局限于上述实施方式，其中散热器、灯罩及脉动式热管可根据空间等不同的需求，设计成不同的形状以进行合理的搭配，如以下实施例。
图7A至图7B为本发明发光二极管灯具70的第五较佳实施例，该灯罩77也呈杯状，其具有一平板状的接触部772及一开口771，该发光二极管灯泡73设于该基板71上，该基板71与该灯罩77的接触部772的内表面接触，该发光二极管灯泡73发出的光经灯罩77反射并聚光后由该开口771射出，该散热器79的基座792呈U型，该灯罩77设于该U型基座792内，即该灯罩77的开口方向与该散热器79的U型基座792的朝向方向相同。该U型基座792的外表面向外长出若干散热鳍片791，其内表面上贴设有脉动式热管75，该脉动式热管75呈U型，其通过连续弯折而形成为多重U型管体组合，该脉动式热管75的内部结构及工作原理与图2或者图5所示的脉动式热管15相同，其中间为吸热段754，两端为放热段755，该灯罩77的接触部772的外表面与吸热段754紧密结合。上述发光二极管灯具70中，发光二极管灯泡73产生的热量由基板71传至灯罩77上，使得一部分热量通过灯罩77散发，而另一部分热量经过灯罩77传至该脉动式热管75的吸热段754，并接着传递至该脉动式热管75两端放热段755的散热鳍片791上，通过散热器79散发到周围的空气中，从而可增加散热面积，提高散热效果。本实施例中，该灯罩77也可以省去接触部772，从而使装设发光二极管灯泡73的基板71直接与该脉动式热管75的吸热段754紧密结合，从而降低热阻。
图7A至图7B所示的发光二极管灯具70中的脉动式热管75、灯罩77及散热器79的位置关系也可变化，如图8A至图8B所示为本发明发光二极管灯具80的第六较佳实施例，其中该脉动式热管85贴设于该散热器89的U型基座892的外表面，灯罩87则位于散热器89的上方，并通过脉动式热管85与散热器89热连接，即该灯罩77的开口方向与该散热器89的U型基座892的朝向正好相反。
图9A至图9D所示为本发明发光二极管灯具90的第七较佳实施例，其中该脉动式热管95的轮廓呈杯状，其俯视图大致呈向外辐射的花瓣状(如图9C至9D所示)，该脉动式热管95中心为吸热区，周缘为放热区，该脉动式热管95贴设于该杯状灯罩97的内表面，该发光二极管灯泡93设于该基板91上，该基板91与该脉动式热管95的吸热区紧密结合，以将由发光二极管灯泡93吸收的热量传至灯罩97的外壳上，然后散发到周围的空气中，即该灯罩97除了充当反光作用外，还充当上述散热器19、79、89的散热角色，据此将散热器与灯罩集成一体，使整体结构更加模组化。本实施例中，还可在灯罩97的外表面设置散热鳍片991(如图9B所示)以增加灯罩97的整体散热面积及散热效果。当然，该脉动式热管95可为图9C所示的封闭的回路型，也可为图9D所示的开路型。

Claims (14)

1.一种发光二极管灯具，包括基板、发光二极管灯泡及散热器，所述发光二极管灯泡电连接至基板上，其特征在于：该发光二极管灯具还包括脉动式热管，该脉动式热管内设有脉管，该脉管内设有中空通道，该脉动式热管同时与该发光二极管灯泡及散热器热连接，使发光二极管灯泡产生的热量能够经由该脉动式热管传递至散热器进行散发。
2.如权利要求1所述的发光二极管灯具，其特征在于：还包括灯罩，所述发光二极管灯泡与基板一起收容于该灯罩内。
3.如权利要求2所述的发光二极管灯具，其特征在于：该灯罩设于基板、发光二极管灯泡、脉动式热管及散热器组成的系统的外围。
4.如权利要求2所述的发光二极管灯具，其特征在于：该散热器的其中一部分收容于灯罩内，另有一部分穿设于灯罩之外。
5.如权利要求1所述的发光二极管灯具，其特征在于：该散热器包括基座及连接于基座表面上的若干散热鳍片。
6.如权利要求5所述的发光二极管灯具，其特征在于：所述基座呈板状，该脉动式热管呈平板型并嵌设在所述基座内。
7.如权利要求5所述的发光二极管灯具，其特征在于：所述基座呈U型，该脉动式热管呈U型并嵌设在所述基座内。
8.如权利要求1所述的发光二极管灯具，其特征在于：还包括灯罩，所述发光二极管灯泡与基板一起收容于该灯罩内，该灯罩由导热材料制成，所述散热器为该灯罩的外壳。
9.如权利要求8所述的发光二极管灯具，其特征在于：该灯罩呈杯状，该脉动式热管呈杯状并嵌设在所述灯罩的外壳内。
10.如权利要求1所述的发光二极管灯具，其特征在于：该脉动式热管通过连续弯折而形成为多重U型管体组合。
11.如权利要求1所述的发光二极管灯具，其特征在于：该脉管贴附于脉动式热管的内壁，且该脉管的外径小于脉动式热管的管径。
12.如权利要求1所述的发光二极管灯具，其特征在于：该脉管由若干可挠性细线编织而成，所述细线为纤维、铜丝或不锈钢丝中至少其中一种。
13.如权利要求1所述的发光二极管灯具，其特征在于：该脉动式热管形成封闭回路或开路。
14.一种发光二极管灯具，包括散热器及至少一发光二极管灯泡，其特征在于：该发光二极管灯具还包括脉动式热管，该脉动式热管内设有脉管，该脉管内设有中空通道，该脉动式热管连续弯折形成为多重U型管体的组合，该脉动式热管的其中一部分区域形成为蒸发区，另一部分区域形成为冷凝区，所述发光二极管灯泡连接至该脉动式热管的蒸发区，所述散热器连接于该脉动式热管的冷凝区，使所述发光二极管灯泡产生的热量经由该脉动式热管传递至散热器进行散发。
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