WO2023103438A1 - 一种吸液芯制备方法及包含该吸液芯的热管 - Google Patents

一种吸液芯制备方法及包含该吸液芯的热管 Download PDF

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WO2023103438A1
WO2023103438A1 PCT/CN2022/112066 CN2022112066W WO2023103438A1 WO 2023103438 A1 WO2023103438 A1 WO 2023103438A1 CN 2022112066 W CN2022112066 W CN 2022112066W WO 2023103438 A1 WO2023103438 A1 WO 2023103438A1
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liquid
heat pipe
microspheres
preparing
absorbing core
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PCT/CN2022/112066
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English (en)
French (fr)
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朱永刚
梁嘉林
吕传文
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深圳市顺熵科技有限公司
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Publication of WO2023103438A1 publication Critical patent/WO2023103438A1/zh

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    • 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
    • F28D15/04—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 tubes having a capillary structure
    • F28D15/046—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 tubes having a capillary structure characterised by the material or the construction of the capillary structure
    • 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
    • H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
    • H05K7/20336—Heat pipes, e.g. wicks or capillary pumps

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  • the invention relates to the technical field of liquid-absorbing cores, in particular to a method for preparing a liquid-absorbing core and a heat pipe comprising the liquid-absorbing core.
  • Heat pipe is an important heat transfer element in thermal management or thermal design. It has good isothermal properties and has a wide range of applications in thermal management of electronic equipment.
  • the development trend of high power consumption, high performance and small size of electronic products makes the thickness of the heat pipe thinner and thinner. At present, the heat transfer limit of ultra-thin heat pipes is small, and it is difficult to meet the heat dissipation requirements of the further development of electronic products.
  • the liquid-absorbing core includes the shell, the liquid-absorbing core and the working fluid, and the liquid-absorbing core is the key to improving the heat transfer performance of the heat pipe.
  • the porous medium liquid-absorbing core has excellent capillary performance, which can effectively promote the capillary return flow of the working fluid and improve the heat transfer performance of the heat pipe.
  • the thickness of existing porous media such as spiral braided mesh, foamed copper, and sintered copper powder is difficult to control during the preparation process, so the application in ultra-thin heat pipes is limited.
  • the regular pore structure can improve the capillary performance of porous media, but in the preparation process of existing porous media by sintering method, weaving method and other methods, the formation of internal pore structure is random and difficult to control. Therefore, the existing porous media It is difficult for the media to further improve the capillary performance in an extremely limited volume.
  • the invention provides a method for preparing a liquid-absorbing core and a heat pipe containing the liquid-absorbing core, which are used to solve the problems in the prior art, improve the capillary performance of the liquid-absorbing core, and improve the heat transfer performance of the heat pipe.
  • the present invention provides the following scheme:
  • the invention provides a method for preparing a liquid-absorbing core, comprising the steps of preparing a skeleton:
  • the preparation method of the liquid-absorbent core further includes S6: forming a nano-microstructure on the surface of the skeleton, and the nano-microstructure has superhydrophilicity.
  • the preparation method of the liquid-absorbent wick further includes S7: setting a plurality of support columns at the end of the framework away from the inner wall of the heat pipe shell, and the support columns are used to support the heat pipe shell.
  • step S1 the inner wall of the heat pipe shell is subjected to hydrophilic treatment by oxidation method or magnetron sputtering method.
  • step S3 the microsphere suspension is heated to accelerate the liquid evaporation rate of the microsphere suspension.
  • step S4 the metal material is copper, and the copper is deposited in the gaps between the microspheres by electrodeposition technology.
  • the microsphere suspension is polystyrene microsphere suspension, and tetrahydrofuran is used to dissolve each microsphere.
  • step S6 an oxidation method is used to form nano-microstructures on the surface of the skeleton.
  • step S7 an etching method is used to process the end of the skeleton away from the inner wall of the heat pipe shell to form the support column.
  • the present invention also provides a heat pipe, comprising a tube shell, a working fluid and a liquid-absorbing core prepared according to the above liquid-absorbing core preparation method, the tube shell is a vacuum-tight hollow shell, and the working fluid is filled in the tube shell Inside, the liquid-absorbing core is fixedly arranged inside the tube shell.
  • the invention provides a method for preparing a liquid-absorbing core and a heat pipe comprising the liquid-absorbing core.
  • the preparation step of the skeleton can or have a skeleton with a regular porous structure, and the regular pores can improve the flow efficiency of liquid in the liquid-absorbing core.
  • the capillary performance of the liquid-absorbing core is improved, and the heat pipe prepared by using this liquid-absorbing core, due to the improvement of the capillary performance of the liquid-absorbing core, the circulation speed of the working fluid in the tube shell is increased, and the efficiency of the gas-liquid phase transition of the working fluid is improved.
  • the heat pipe prepared by using the liquid-absorbing core has better heat transfer performance than the traditional heat pipe, and can better dissipate heat from the equipment.
  • Fig. 1 is the structural diagram of the liquid-absorbent core that the invention provides
  • Fig. 2 is the internal structural diagram of the heat pipe provided by the invention.
  • the object of the present invention is to provide a method for preparing a liquid-absorbing core and a heat pipe containing the liquid-absorbing core, so as to solve the problems existing in the prior art, improve the capillary performance of the liquid-absorbing core, and improve the heat transfer performance of the heat pipe
  • This embodiment provides a method for preparing a liquid-absorbent core, including the preparation steps of skeleton 5:
  • the microsphere suspension can be heated to accelerate the evaporation of the microsphere suspension. After the liquid of the microsphere suspension is completely evaporated, the microsphere template is heat-treated, so that each The contact positions of the microspheres stick together;
  • S4 Use electrodeposition technology to fill the gaps between the microspheres with copper.
  • copper can fill the gaps between the microspheres.
  • this method can control the thickness of the skeleton 5 to meet the needs of heat pipes 100 of different sizes;
  • the microsphere suspension is a polystyrene microsphere suspension
  • the reagent for dissolving the microspheres is tetrahydrofuran
  • the dissolved liquid is removed to form a skeleton 5, which includes the microspheres
  • the nano-microstructure has super-hydrophilicity, which can improve the capillary performance of the liquid-absorbing core 3 , improve the efficiency of gas-liquid conversion of the working fluid, and further improve the heat dissipation performance of the heat pipe 100 .
  • S7 form a plurality of regularly arranged support columns 4 at the end of the skeleton 5 away from the inner wall of the heat pipe 100 shell, preferably, methods such as etching, photolithography, and machine tool processing can be used, and the support columns 4 are used to carry out the heat pipe 100 shell
  • the support makes the heat pipe 100 have higher strength and prevents damage under external force.
  • the liquid-absorbing core 3 prepared by using the liquid-absorbing core 3 provided in this embodiment can control the size of the skeleton 5 according to the demand, which improves the adaptability of the liquid-absorbing core 3, and the liquid-absorbing core 3 has a regular porous structure, which improves the absorption capacity. Capillary performance of liquid core 3.
  • This embodiment provides a heat pipe 100, including a tube shell, a working fluid, and a liquid-absorbing core 3 prepared according to the method for preparing a liquid-wick in Example 1.
  • the tube shell is a vacuum-sealed hollow shell, and the working fluid is filled in the tube.
  • the liquid-absorbing core 3 is fixedly arranged in the tube shell.
  • the tube shell includes an upper cover 1 and a lower cover 2.
  • the lower cover 2 is a shell with an open lower end, and the lower cover 2 closes the opening end of the upper cover 1.
  • a vacuum-tight cavity 7 is formed by sealing, and the liquid-absorbing core 3 is fixedly arranged on the inner surface of the upper cover 1 or the lower cover 2 .
  • this kind of heat pipe 100 increases the circulation speed of the working fluid in the tube shell and promotes the gas-liquid phase change of the working fluid, so that the heat pipe 100 in this embodiment is better than the traditional heat pipe 100.
  • the thermal performance is better, and the device can be better dissipated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Building Environments (AREA)

Abstract

本发明公开一种吸液芯制备方法及包含该吸液芯的热管，涉及吸液芯技术领域，包括骨架的制备步骤：对热管管壳的内壁进行亲水性处理；将微球悬浮液置于热管管壳的内壁上，利用热管管壳内壁的亲水性将微球悬浮液中的微球进行自动铺设，各相邻微球接触堆积形成具有体心立方密堆积结构的微球模板；待微球悬浮液的液体蒸发后，将微球模板进行热处理，使得各微球的接触位置相连接；将金属材料填充在各微球之间的间隙；将各微球溶解，去除溶解后的液体后，形成骨架。利用该方法制备的吸液芯具有良好的毛细性能，利用该吸液芯制备的热管相对于传统的热管传热性能更优，能够对设备进行更好的散热。

Description

一种吸液芯制备方法及包含该吸液芯的热管 技术领域
本发明涉及吸液芯技术领域，特别是涉及一种吸液芯制备方法及包含该吸液芯的热管。
背景技术
热管是热管理或热设计中重要的传热元件，具有良好的等温性，在电子设备热管理中有着广泛的应用。电子产品的高功耗、高性能及小尺寸的发展趋势，使得热管的厚度也越来越薄。目前超薄热管的传热极限较小，难以满足电子产品进一步发展的散热需求。
吸液芯包括管壳、吸液芯和工作液，吸液芯是提高热管传热性能的关键。多孔介质吸液芯具有优异的毛细性能，能够有效促进工质的毛细回流，提高热管的传热性能。现有的螺旋编织网、泡沫铜、烧结铜粉等多孔介质在制备过程厚度难以控制，因此在超薄热管上的应用受限。此外，规则的孔隙结构能够提高多孔介质的毛细性能，但现有多孔介质利用烧结法、编织法等方法制备过程中，其内部孔隙结构的形成是随机的，难以调控，因此，现有的多孔介质难以在极其有限的体积下进一步提高毛细性能。
发明内容
本发明提供了一种吸液芯制备方法及包含该吸液芯的热管，用以解决现有技术存在的问题，提升吸液芯的毛细性能，提高热管的传热性。
为实现上述目的，本发明提供了如下方案：
本发明提供了一种吸液芯制备方法，包括骨架的制备步骤：
S1：对热管管壳的内壁进行亲水性处理；
S2：将微球悬浮液置于所述热管管壳的内壁上，利用所述热管管壳内壁的亲水性将所述微球悬浮液中的微球进行自动铺设，各相邻所述微球接触堆积形成具有体心立方密堆结构的微球模板；
S3:待所述微球悬浮液的液体蒸发后，将所述微球模板进行热处理， 使得各所述微球的接触位置相连接；
S4：将铜填充在各所述微球之间的间隙；
S5：将各所述微球溶解，去除溶解后的液体，形成所述骨架。
进一步的，所述吸液芯制备方法还包括S6：在所述骨架表面形成纳米微结构，所述纳米微结构具有超亲水性。
进一步的，所述吸液芯制备方法还包括S7：在所述骨架远离所述热管管壳内壁的一端设置多个支撑柱，所述支撑柱用于对所述热管管壳进行支撑。
进一步的，在步骤S1中，利用氧化法或磁控溅射法对所述热管管壳的内壁进行亲水性处理。
进一步的，在步骤S3中，将所述微球悬浮液进行加热，加速所述微球悬浮液的液体蒸发速率。
进一步的，在步骤S4中，所述金属材料为铜，利用电沉积技术将所述铜沉积于各所述微球之间的间隙。
进一步的，在步骤S5中，所述微球悬浮液为聚苯乙烯微球悬浮液，利用四氢呋喃将各所述微球进行溶解。
进一步的，在步骤S6中，利用氧化法在所述骨架表面形成纳米微结构。
进一步的，在步骤S7中，利用蚀刻法将所述骨架远离所述热管管壳内壁的一端进行处理，形成所述支撑柱。
本发明还提供了一种热管，包括管壳、工作液和根据上述的吸液芯制备方法制备的吸液芯，所述管壳为真空密封的空心壳体，所述工作液填充在管壳内，所述吸液芯固定设置在所述管壳的内。
本发明相对于现有技术取得了以下技术效果：
本发明提供一种吸液芯制备方法及包含该吸液芯的热管，利用骨架的 制备步骤能够或者具有规则的多孔结构的骨架，而规则的多孔能够提高液体在吸液芯中的流动效率，进而提高吸液芯的毛细性能，利用此种吸液芯制备的热管，由于吸液芯的毛细性能提高，使得工作液在管壳内的循环速度提升，提高工作液的气液相变的效率，故利用该吸液芯制备的热管相对于传统的热管传热性能更优，能够对设备进行更好的散热。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为发明提供的吸液芯的结构图；
图2为发明提供的热管的内部结构图；
附图标记说明：1、上盖；2、下盖；3、吸液芯、4、支撑柱；5、骨架；6、连接孔；7、空腔；100、热管。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明的目的为提供一种吸液芯制备方法及包含该吸液芯的热管，用以解决现有技术存在的问题，提升吸液芯的毛细性能，提高热管的传热性
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本发明作进一步详细的说明。
实施例1
本实施例提供了一种吸液芯制备方法，包括骨架5的制备步骤：
S1：利用氧化法或者磁控溅射法对热管100管壳的内壁进行亲水性处理，使得热管100管壳的内壁具备亲水性；
S2：将微球悬浮液置于热管100管壳的内壁上，利用热管100管壳内壁的亲水性将聚苯乙烯微球悬浮液中的微球进行自动铺设，各相邻微球接触堆积形成具有体心立方密堆积结构的微球模板；
S3:将微球悬浮液的液体蒸发，优选的，可以对微球悬浮液进行加热，加速微球悬浮液的蒸发，微球悬浮液的液体蒸发完全后，将微球模板进行热处理，使得各微球的接触位置相粘连；
S4：利用电沉积技术将铜填充在各微球之间的间隙，具体的，铜能够将各所述微球之间的间隙填满，优选的，利用电沉积技术由下到上的逐层的对微球进行铜沉积，此种方法能够控制骨架5的厚度以适应不同的尺寸的热管100的需求；
S5：将各微球进行溶解，优选的，所述微球悬浮液为聚苯乙烯微球悬浮液，溶解微球的试剂选用四氢呋喃，去除溶解后的液体，形成骨架5，骨架5包括微球溶解后留下的空腔7及相邻微球接触位置溶解后留下的连接孔6，各连接孔6将相邻空腔7进行连接形成具有规则孔洞的骨架5。
S6：在骨架5表面形成纳米微结构，优选地，可采用氧化法。纳米微结构具有超亲水性，能够提高吸液芯3的毛细性能，提高工作液气液转换的效率，进而提升热管100的散热性能。
S7：在骨架5远离热管100管壳内壁的一端形成多个规则排布的支撑柱4，优选的，可采用蚀刻、光刻、机床加工等方法，支撑柱4用于对热管100管壳进行支撑，使得热管100具有更高的强度，防止外力作用下的损坏。
利用本实施例提供的吸液芯3制备的吸液芯3，可以根据需求控制骨架5的尺寸，提高了吸液芯3的适应性，而且吸液芯3具有规则的多孔结构，提高了吸液芯3的毛细性能。
实施例2
本实施例提供了一种热管100，包括管壳、工作液和根据实施例1中的吸液芯制备方法制备的吸液芯3，管壳为真空密封的空心壳体，工作液填充在管壳内，吸液芯3固定设置在管壳的内，具体的，管壳包括上盖1和下盖2，下盖2为下端开口的壳体，下盖2将上盖1的开口端进行密封 形成真空密闭的空腔7，吸液芯3固定设置在上盖1或下盖2的内表面。此种热管100由于吸液芯3的毛细性能提高，使得工作液在管壳内的循环速度提升，促进工作液的气液相变，使得本实施例中的热管100相对于传统的热管100传热性能更优，能够对设备进行更好的散热。
本说明书中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处。综上所述，本说明书内容不应理解为对本发明的限制。

Claims (10)

  1. 一种吸液芯制备方法，其特征在于：包括骨架的制备步骤：
    S1：对热管管壳的内壁进行亲水性处理；
    S2：将微球悬浮液置于所述热管管壳的内壁上，利用所述热管管壳内壁的亲水性将所述微球悬浮液中的微球进行自动铺设，各相邻所述微球接触堆积形成具有体心立方密堆积结构的微球模板；
    S3:待所述微球悬浮液的液体蒸发后，将所述微球模板进行热处理，使得各所述微球的接触位置相连接；
    S4：将金属材料填充在各所述微球之间的间隙；
    S5：将各所述微球溶解，去除溶解后的液体后，形成所述骨架。
  2. 根据权利要求1所述的吸液芯制备方法，其特征在于：还包括S6：在所述骨架表面形成纳米微结构，所述纳米微结构具有超亲水性。
  3. 根据权利要求1所述的吸液芯制备方法，其特征在于：还包括S7：在所述骨架远离所述热管管壳内壁的一端设置多个支撑柱，所述支撑柱用于对所述热管管壳进行支撑。
  4. 根据权利要求1所述的吸液芯制备方法，其特征在于：在步骤S1中，利用氧化法或磁控溅射法对所述热管管壳的内壁进行亲水性处理。
  5. 根据权利要求1所述的吸液芯制备方法，其特征在于：在步骤S3中，将所述微球悬浮液进行加热，加速所述微球悬浮液的液体蒸发速率。
  6. 根据权利要求1所述的吸液芯制备方法，其特征在于：在步骤S4中，所述金属材料为铜，利用电沉积技术将所述铜沉积在各所述微球之间的间隙。
  7. 根据权利要求1所述的吸液芯制备方法，其特征在于：在步骤S5中，所述微球悬浮液为聚苯乙烯微球悬浮液，利用四氢呋喃将各所述微球进行溶解。
  8. 根据权利要求2所述的吸液芯制备方法，其特征在于：在步骤S6 中，利用氧化法在所述骨架表面形成纳米微结构。
  9. 根据权利要求3所述的吸液芯制备方法，其特征在于：在步骤S7中，利用蚀刻法将所述骨架远离所述热管管壳内壁的一端进行处理，形成所述支撑柱。
  10. 一种热管，其特征在于：包括管壳、工作液和根据权利要求1-9任意一项所述的吸液芯制备方法制备的吸液芯，所述管壳为真空密封的空心壳体，所述工作液填充在管壳内，所述吸液芯固定设置在所述管壳的内。
PCT/CN2022/112066 2021-12-10 2022-08-12 一种吸液芯制备方法及包含该吸液芯的热管 WO2023103438A1 (zh)

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