US20080099186A1 - Flexible heat pipe - Google Patents

Flexible heat pipe Download PDF

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Publication number
US20080099186A1
US20080099186A1 US11/686,939 US68693907A US2008099186A1 US 20080099186 A1 US20080099186 A1 US 20080099186A1 US 68693907 A US68693907 A US 68693907A US 2008099186 A1 US2008099186 A1 US 2008099186A1
Authority
US
United States
Prior art keywords
heat pipe
wick
flexible heat
wick structure
casing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/686,939
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English (en)
Inventor
Fang-Xiang Yu
Yeu-Lih Lin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foxconn Technology Co Ltd
Original Assignee
Foxconn Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Foxconn Technology Co Ltd filed Critical Foxconn Technology Co Ltd
Assigned to FOXCONN TECHNOLOGY CO., LTD. reassignment FOXCONN TECHNOLOGY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIN, YEU-LIH, YU, FANG-XIANG
Publication of US20080099186A1 publication Critical patent/US20080099186A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F28D15/0241—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 the tubes being flexible
    • 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
    • F28D15/04—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
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to a heat pipe, and more particularly to a flexible heat pipe having a high heat transfer capability when it is bent.
  • the typical flexible heat pipe includes a casing and a wick structure contacting with an inner surface of the casing.
  • the wick structure contains a working medium.
  • the casing includes an evaporation section connected with a heat generating electronic component such as a CPU, a condensation section connected with a heat dissipating apparatus such as a heat sink, and a flexible adiabatic section connecting the evaporation section with the condensation section for transferring heat.
  • the wick structure is selected from mesh wick, or fibrous wick which provides capillary force to help circulation of the working medium between the evaporation section and the condensation section of the casing.
  • the adiabatic section of the flexible heat pipe needs to be bent to achieve miniaturization of the electronic products.
  • the wick structure may separate from the inner surface of the casing since the wick structure has a different flexibility coefficient to that of the casing. This decreases heat exchange between the casing and the wick structure and liquid transportation capability of the wick structure, which further decreases heat transfer through the flexible heat pipe. Therefore, there is a need for a flexible heat pipe which can be bent without overly decreasing its heat transfer capability.
  • the present invention relates to a flexible heat pipe.
  • the flexible heat pipe includes a casing and a wick structure arranged in the casing.
  • the wick structure contains a working medium.
  • the casing includes an evaporation section, a condensation section, and a flexible adiabatic section connecting the evaporation section with the condensation section.
  • the wick structure includes first, second and third portions respectively disposed in the evaporation, the condensation and the adiabatic sections of the casing.
  • the adiabatic section of the casing further accommodates a supporting member therein for supporting the third portion of the wick structure to have an intimate contact with an inner surface of the adiabatic section.
  • FIG. 1 is a schematic view of a flexible heat pipe in accordance with a first embodiment of the present invention
  • FIG. 2 is a partly sectional view of an adiabatic section of the flexible heat pipe of FIG. 1 ;
  • FIG. 3 is a cross-sectional view of the flexible heat pipe of FIG. 1 , taken along line III-III thereof;
  • FIG. 4 is similar to FIG. 3 , but shown a flexible heat pipe in accordance with a second embodiment of the present invention
  • FIG. 5 is a longitudinal sectional view of an adiabatic section of a flexible heat pipe in accordance with a third embodiment of the present invention.
  • FIG. 6 is a schematic view of a flexible heat pipe in accordance with a fourth embodiment of the present invention.
  • FIG. 7 is a cross-sectional view of the flexible heat pipe of FIG. 6 , taken along line VII-VII thereof;
  • FIG. 8 is a cross-sectional view of the flexible heat pipe of FIG. 6 , taken along line VIII-VIII thereof.
  • the heat pipe 10 includes a casing 12 , and a wick structure 20 disposed in the casing 12 .
  • the wick structure 20 contains working medium (not shown).
  • the casing 12 includes an evaporation section 122 for connecting with a heat generating electronic component (not shown) such as a CPU, a condensation section 126 for connecting with a heat dissipating apparatus (not shown) such as a heat sink, and an adiabatic section 124 connecting the evaporation section 122 with the condensation section 126 for transferring heat therebetween.
  • the adiabatic section 124 connects with the evaporation and the condensation sections 122 , 126 via two connecting members 127 .
  • Both the evaporation and the condensation sections 122 , 126 of the casing 12 are made of high thermally conductive material such as copper, stainless steel or aluminum.
  • the adiabatic section 124 is made of flexible material such as plastics, rubber or soft metal.
  • the wick structure 20 is a fibrous wick including a plurality of wires 22 .
  • the wires 22 are evenly distributed around an inner surface and parallel to an axis of the casing 12 .
  • the wires 22 are made of flexible material such as copper, stainless steel, or fiber.
  • the wires 22 are each separated by a small distance from the wires adjacent to them along a circumference of the casing 12 so as to provide a capillary force therebetween.
  • the working medium is a fluid having a lower boiling point and being compatible with the casing 12 and the wick structure 20 , such as water, alcohol, kerosene, or paraffin.
  • the heat pipe 10 further includes a supporting member 30 for holding the wick structure 20 in intimate contact with the inner surface of the casing 12 .
  • the supporting member 30 is a coil spring, and is inserted into an inner surface of the wick structure 20 .
  • a diameter of an outer surface of the supporting member 30 is marginally greater than or equal to that of the inner surface of the wick structure 20 so as to push the wick structure 20 towards the inner surface of the casing 12 .
  • the supporting member 30 is made of a flexible material such as copper, stainless steel, or polyamide so that the supporting member 30 provides a radial resilient force which pushes the wick structure 20 into intimate contact with the inner surface of the casing 12 .
  • the supporting member 30 is inserted into the inner surface of the wick structure 20 and holds the wick structure 20 in intimate contact with the inner surface of the casing 12 .
  • the wick structure 20 and the supporting member 30 at this section accordingly bends.
  • the supporting member 30 generates a resilient force which urges the wick structure 20 towards the inner surface of the casing 12 . Therefore, the wick structure 20 of the heat pipe 10 remains in intimate contact with the inner surface of the casing 12 when it is bent. In this way significant reduction of the heat transfer capability of the flexible heat pipe 10 caused by bending of the adiabatic section 124 of the casing 12 is avoided.
  • a flexible heat pipe 10 a according to a second embodiment of the present invention is shown.
  • the wick structure 20 a in the second embodiment of the present flexible heat pipe 10 a is different from the wick structure 20 in the first embodiment of the present flexible heat pipe 10 .
  • the wick structure 20 a of the heat pipe 10 a is a mesh wick woven from a plurality of metal wires such as copper wires, or stainless steel wires.
  • the mesh wick may also be woven from a plurality of fiber wires. The mesh wick is urged to have an intimate contact with the inner surface of the casing 12 via the supporting member 30 .
  • the supporting member 30 b of the heat pipe 10 b is a column shaped tube, where a diameter of an outer surface of the tube is a bit greater than or equal to that of the inner surface of the wick structure 20 b .
  • the wick structure 20 b is pushed towards the inner surface of the casing 12 .
  • the tube defines a plurality of pores 31 in a periphery wall thereof, so that the working medium can flow through these pores 31 .
  • the porosity of the supporting member 30 b should be about 70%.
  • a flexible heat pipe 10 c according to a fourth embodiment of the present invention is shown.
  • the wick structure of the flexible heat pipe 10 c is divided into a first portion 21 , a second portion 23 and a third portion (not shown) along a main axis of the casing 12 .
  • the first portion 21 , the second portion 23 and the third portion of the wick structure are respectively disposed in the evaporation, the condensation and the adiabatic sections 122 , 126 , 124 of the casing 12 .
  • Both the first and the second portion 21 , 23 of the wick structure are sintered wicks, whilst the third portion of the wick structure is a mesh wick or a fibrous wick.
  • the first and second portions 21 , 23 of the wick structure may be of types differing from each other, e.g. the first portion 21 of the wick structure may be a grooved wick, whilst the second portion 23 of the wick structure may be a sintered wick.
  • An average capillary pore size of the first portion 21 of the wick structure is greater than that of the second portion 21 of the wick structure, thus allowing the small-sized second portion 23 of the wick structure to develop a large capillary force to rapidly absorb the condensed working medium. In this way the working medium can be caused to rapidly enter into the second portion 23 of the wick structure at the condensation section 126 of the casing 12 .
  • the large-sized first portion 21 of the wick structure provides a reduced amount of resistance to the working medium flowing through the adiabatic section 124 towards the evaporation section 122 of the casing 12 .
  • the circulation speed of the working medium in the casing 12 is increased, which further improves the heat transfer capability of the flexible heat pipe 10 c.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
US11/686,939 2006-11-01 2007-03-15 Flexible heat pipe Abandoned US20080099186A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610063418.2A CN101173843A (zh) 2006-11-01 2006-11-01 柔性热管
CN200610063418.2 2006-11-01

Publications (1)

Publication Number Publication Date
US20080099186A1 true US20080099186A1 (en) 2008-05-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US11/686,939 Abandoned US20080099186A1 (en) 2006-11-01 2007-03-15 Flexible heat pipe

Country Status (2)

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US (1) US20080099186A1 (zh)
CN (1) CN101173843A (zh)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120148967A1 (en) * 2010-12-13 2012-06-14 Thomas Thomas J Candle wick including slotted wick members
US20130174577A1 (en) * 2012-01-10 2013-07-11 Spring (U.S.A.) Corporation Heating and Cooling Unit with Semiconductor Device and Heat Pipe
JP2016501446A (ja) * 2012-11-26 2016-01-18 ノースロップ グラマン システムズ コーポレーション エレクトロニクス用の可撓性の熱インターフェース
US9416995B2 (en) 2012-01-10 2016-08-16 Spring (U.S.A.) Corporation Heating and cooling unit with semiconductor device and heat pipe
US20170220082A1 (en) * 2014-06-12 2017-08-03 Huawei Technologies Co., Ltd. Intelligent terminal heat dissipation apparatus and intelligent terminal
US20170315598A1 (en) * 2016-03-16 2017-11-02 Microsoft Technology Licensing, Llc Thermal management system including an elastically deformable phase change device
USD811802S1 (en) 2016-07-15 2018-03-06 Spring (U.S.A.) Corporation Food server
US9909789B2 (en) 2012-01-10 2018-03-06 Spring (U.S.A.) Corporation Heating and cooling unit with canopy light
US10139137B1 (en) * 2017-06-20 2018-11-27 The United States Of America As Represented By The Secretary Of The Navy Heat exchanger reactive to internal and external temperatures
US20200149823A1 (en) * 2018-11-09 2020-05-14 Furukawa Electric Co., Ltd. Heat pipe
EP3865803A1 (en) * 2020-02-14 2021-08-18 Hamilton Sundstrand Corporation Compliant oscillating heat pipes
CN113503756A (zh) * 2021-06-22 2021-10-15 哈尔滨工业大学（深圳） 一种可弯折防塌陷型柔性平板热管及其制造方法
US20220341680A1 (en) * 2021-04-27 2022-10-27 Asia Vital Components (China) Co., Ltd. Heat pipe structure
US20230030019A1 (en) * 2021-07-27 2023-02-02 Asia Vital Components Co., Ltd. Heat pipe structure
US20230204301A1 (en) * 2021-12-24 2023-06-29 Asia Vital Components (China) Co., Ltd. Hetero-material floating heat pipe structure
WO2024084165A1 (fr) 2022-10-20 2024-04-25 Airbus Defence And Space Sas Dispositif flexible de transfert de chaleur par circulation d'un fluide diphasique

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TWI416057B (zh) * 2010-02-11 2013-11-21 Chaun Choung Technology Corp 可彎曲變形的熱管結構及其製作方法
CN102169857A (zh) * 2010-02-26 2011-08-31 昆山巨仲电子有限公司 可弯曲变形的热管结构及其制作方法
CN102748971A (zh) * 2011-04-18 2012-10-24 中国科学院理化技术研究所 一种基于低熔点金属关节的柔性导热装置
CN104422320B (zh) * 2013-08-21 2016-04-20 英业达科技有限公司 热管
CN104374221B (zh) * 2014-11-05 2016-10-19 上海交通大学 基于金属材料和聚合材料复合的热管或均热板的制作方法
CN105658022B (zh) * 2014-11-13 2018-02-23 奇鋐科技股份有限公司 穿戴式移动设备散热结构
CN104952818B (zh) * 2015-05-25 2018-12-14 联想(北京)有限公司 一种导热装置以及电子设备
CN104976908B (zh) * 2015-07-09 2016-08-17 武汉大学 柔性热管
CN107687784A (zh) * 2017-09-25 2018-02-13 济南大学 一种能变换角度的双向长热管
CN108225075A (zh) * 2018-03-08 2018-06-29 广州华钻电子科技有限公司 一种高性能热管
CN109287109B (zh) * 2018-11-27 2020-07-10 上海交通大学 一种基于毛细导流的干法相变换热设备
CN110793368A (zh) * 2019-11-14 2020-02-14 刘溯晓 柔性导热模组
CN110958814B (zh) * 2019-12-09 2024-05-03 广州智冷节能科技有限公司 一种服务器用柔性相变传热降温器
CN111829378A (zh) * 2020-06-03 2020-10-27 广州大学 一种多段铰链式柔性热管

Citations (7)

* Cited by examiner, † Cited by third party
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US3604503A (en) * 1968-08-02 1971-09-14 Energy Conversion Systems Inc Heat pipes
US3789920A (en) * 1970-05-21 1974-02-05 Nasa Heat transfer device
US4109709A (en) * 1973-09-12 1978-08-29 Suzuki Metal Industrial Co, Ltd. Heat pipes, process and apparatus for manufacturing same
US4116266A (en) * 1974-08-02 1978-09-26 Agency Of Industrial Science & Technology Apparatus for heat transfer
US4489777A (en) * 1982-01-21 1984-12-25 Del Bagno Anthony C Heat pipe having multiple integral wick structures
US4640347A (en) * 1984-04-16 1987-02-03 Q-Dot Corporation Heat pipe
US6619384B2 (en) * 2001-03-09 2003-09-16 Electronics And Telecommunications Research Institute Heat pipe having woven-wire wick and straight-wire wick

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604503A (en) * 1968-08-02 1971-09-14 Energy Conversion Systems Inc Heat pipes
US3789920A (en) * 1970-05-21 1974-02-05 Nasa Heat transfer device
US4109709A (en) * 1973-09-12 1978-08-29 Suzuki Metal Industrial Co, Ltd. Heat pipes, process and apparatus for manufacturing same
US4116266A (en) * 1974-08-02 1978-09-26 Agency Of Industrial Science & Technology Apparatus for heat transfer
US4489777A (en) * 1982-01-21 1984-12-25 Del Bagno Anthony C Heat pipe having multiple integral wick structures
US4640347A (en) * 1984-04-16 1987-02-03 Q-Dot Corporation Heat pipe
US6619384B2 (en) * 2001-03-09 2003-09-16 Electronics And Telecommunications Research Institute Heat pipe having woven-wire wick and straight-wire wick

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120148967A1 (en) * 2010-12-13 2012-06-14 Thomas Thomas J Candle wick including slotted wick members
US20130174577A1 (en) * 2012-01-10 2013-07-11 Spring (U.S.A.) Corporation Heating and Cooling Unit with Semiconductor Device and Heat Pipe
US9416995B2 (en) 2012-01-10 2016-08-16 Spring (U.S.A.) Corporation Heating and cooling unit with semiconductor device and heat pipe
US9909789B2 (en) 2012-01-10 2018-03-06 Spring (U.S.A.) Corporation Heating and cooling unit with canopy light
JP2016501446A (ja) * 2012-11-26 2016-01-18 ノースロップ グラマン システムズ コーポレーション エレクトロニクス用の可撓性の熱インターフェース
US20170220082A1 (en) * 2014-06-12 2017-08-03 Huawei Technologies Co., Ltd. Intelligent terminal heat dissipation apparatus and intelligent terminal
US10088879B2 (en) * 2014-06-12 2018-10-02 Huawei Technologies Co., Ltd. Intelligent terminal heat dissipation apparatus and intelligent terminal
US10656688B2 (en) * 2016-03-16 2020-05-19 Microsoft Technology Licensing, Llc Thermal management system including an elastically deformable phase change device
US20170315598A1 (en) * 2016-03-16 2017-11-02 Microsoft Technology Licensing, Llc Thermal management system including an elastically deformable phase change device
USD811802S1 (en) 2016-07-15 2018-03-06 Spring (U.S.A.) Corporation Food server
US10139137B1 (en) * 2017-06-20 2018-11-27 The United States Of America As Represented By The Secretary Of The Navy Heat exchanger reactive to internal and external temperatures
US20200149823A1 (en) * 2018-11-09 2020-05-14 Furukawa Electric Co., Ltd. Heat pipe
US10976112B2 (en) * 2018-11-09 2021-04-13 Furukawa Electric Co., Ltd. Heat pipe
EP3865803A1 (en) * 2020-02-14 2021-08-18 Hamilton Sundstrand Corporation Compliant oscillating heat pipes
US20220341680A1 (en) * 2021-04-27 2022-10-27 Asia Vital Components (China) Co., Ltd. Heat pipe structure
CN113503756A (zh) * 2021-06-22 2021-10-15 哈尔滨工业大学（深圳） 一种可弯折防塌陷型柔性平板热管及其制造方法
US20230030019A1 (en) * 2021-07-27 2023-02-02 Asia Vital Components Co., Ltd. Heat pipe structure
US20230204301A1 (en) * 2021-12-24 2023-06-29 Asia Vital Components (China) Co., Ltd. Hetero-material floating heat pipe structure
US11781816B2 (en) * 2021-12-24 2023-10-10 Asia Vital Components (China) Co., Ltd. Hetero-material floating heat pipe structure
WO2024084165A1 (fr) 2022-10-20 2024-04-25 Airbus Defence And Space Sas Dispositif flexible de transfert de chaleur par circulation d'un fluide diphasique
FR3141238A1 (fr) 2022-10-20 2024-04-26 Airbus Defence And Space Sas Dispositif de flexible de transfert de chaleur par circulation d'un fluide diphasique

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Legal Events

Date Code Title Description
AS Assignment

Owner name: FOXCONN TECHNOLOGY CO., LTD., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YU, FANG-XIANG;LIN, YEU-LIH;REEL/FRAME:019021/0330

Effective date: 20070313

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION