US20120048517A1 - Heat pipe with composite wick structure - Google Patents

Heat pipe with composite wick structure Download PDF

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Publication number
US20120048517A1
US20120048517A1 US12/873,253 US87325310A US2012048517A1 US 20120048517 A1 US20120048517 A1 US 20120048517A1 US 87325310 A US87325310 A US 87325310A US 2012048517 A1 US2012048517 A1 US 2012048517A1
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US
United States
Prior art keywords
wick
heat pipe
fiber
tube
composite
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
US12/873,253
Inventor
Yu- Po HUANG
Tung-Jung Kuo
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.)
KUNSHAN JUE-CHUNG ELECTRONICS Co Ltd
Kunshan Jue Chung Electronics Co
Original Assignee
Kunshan Jue Chung Electronics Co
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 Kunshan Jue Chung Electronics Co filed Critical Kunshan Jue Chung Electronics Co
Priority to US12/873,253 priority Critical patent/US20120048517A1/en
Assigned to KUNSHAN JUE-CHUNG ELECTRONICS CO., LTD. reassignment KUNSHAN JUE-CHUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUANG, YU- PO, KUO, TUNG-JUNG
Publication of US20120048517A1 publication Critical patent/US20120048517A1/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
    • F28D15/04—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
    • 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
    • F28D15/0233—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 conduits having a particular shape, e.g. non-circular cross-section, annular

Definitions

  • the invention generally relates to heat transfer elements, particularly to heat pipes.
  • a heat pipe is a heat transfer element which employing phase transition to efficiently transfer heat between two solid interfaces.
  • an evaporating portion and a condensing portion are separately defined at two ends of a heat pipe.
  • a work fluid within the heat pipe turns into a vapor by absorbing the heat.
  • the vapor condenses back into a liquid at the condensing portion, releasing the latent heat by a heat sink.
  • the liquid then returns to the evaporating portion through either capillary action or gravity action where it evaporates once more and repeats the cycle.
  • heat pipes are not always arranged in a direction that the evaporating portion is downward.
  • a heat pipe may be arranged reversely or obliquely. This tends to make the work fluid which is in liquid phase and is flowing back contained by gravity.
  • the wick structure is placed on an inner wall of the pipe. Thus only a part of wick structure can provide a capillary force to push the work fluid when the heat pipe is slant. The efficiency of flowing back of the work fluid is not good enough.
  • An object of the invention is to improve the efficiency of flowing back of work fluid regardless of the direction of heat pipe.
  • the heat pipe of the invention includes a tube in which an evaporating portion and a condensing portion are defined; a grooved wick longitudinally and entirely disposed on an inner wall of the tube and communicating the evaporating portion with the condensing portion; a porous wick only disposed on the inner wall of the evaporating portion and covering the grooved wick in the evaporating portion; and a fiber wick in a shape of a strip, whose one end connects the porous wick and whose the other end longitudinally extends to the condensing portion.
  • FIG. 1 is a longitudinal sectional view of the first embodiment of the invention
  • FIG. 2 is a cross-sectional view along line 2 - 2 in FIG. 1 ;
  • FIG. 3 is a cross-sectional view along line 3 - 3 in FIG. 1 ;
  • FIG. 4 is a partially sectional view of the first embodiment of the invention.
  • FIG. 5 shows a typical application of the first embodiment of the invention
  • FIG. 6 is a cross-sectional view of the evaporating portion of the second embodiment of the invention.
  • FIG. 7 is a cross-sectional view of the condensing portion of the second embodiment of the invention.
  • the heat pipe of the invention includes a tube 10 , a grooved wick 11 , a porous wick 12 and a fiber wick 13 .
  • An evaporating portion 100 and a condensing portion 101 are defined in the tube 10 .
  • the evaporating portion 100 and the condensing portion 101 are separately located at two ends of the tube 10 .
  • the grooved wick 11 is longitudinally and entirely disposed on an inner wall of the tube 10 and communicates the evaporating portion 100 and the condensing portion 101 .
  • a work fluid (not shown) contained in the tube 10 may flow back from the condensing portion 101 to the evaporating portion 100 through the grooved wick 11 .
  • the porous wick 12 is made of sintered powder.
  • the porous wick 12 is only disposed on the inner wall of the evaporating portion 100 and covers the grooved wick 11 in the evaporating portion 100 .
  • the fiber wick 13 is a strip of woven fiber or metallic wires.
  • One end 130 of the strip of fiber wick 13 connects to the porous wick 12 as shown in FIG. 3 .
  • the end 130 is sintered together with the porous wick 12 when the porous wick 12 is being sintered.
  • the other end 131 of the fiber wick 13 longitudinally extends to the condensing portion 101 as shown in FIG. 2 .
  • the end 131 of the fiber wick 13 is just placed at the condensing portion 101 without any fastening.
  • a cross-sectional area of the fiber wick 13 is about one eighth of that of the tube 10 .
  • the evaporating portion 100 is touched by a heat source 2 and the condensing portion 101 is connected with fins 3 .
  • the heat source 2 is generating heat
  • the work fluid in the porous wick 12 starts evaporating.
  • the evaporated work fluid will move to the condensing portion 101 because the porous wick 12 is only located in the evaporating portion 100 .
  • the evaporated work fluid will further condense by releasing heat to the fins 3 .
  • the condensed work fluid flows back the evaporating portion 100 through the grooved wick 11 .
  • the distal end 131 of the fiber wick 13 will naturally pend because of gravity.
  • the pendent fiber wick 13 will reach and absorb the condensed work fluid to transfer it back to the porous wick 12 in the evaporating portion 100 .
  • the efficiency of heat transfer of the heat pipe 1 can be increased.
  • the tube 10 of the heat pipe 1 also can be flat so as to make the fiber wick 13 in the condensing portion 101 gripped by the tube 10 as shown in FIG. 7 . But the fiber wick 13 in the evaporating portion 100 is pressed by the porous wick 12 and not touched by the tube 10 .

Abstract

The heat pipe of the invention includes a tube in which an evaporating portion and a condensing portion are defined; a grooved wick longitudinally and entirely disposed on an inner wall of the tube and communicating the evaporating portion with the condensing portion; a porous wick only disposed on the inner wall of the evaporating portion and covering the grooved wick in the evaporating portion; and a fiber wick in a shape of a strip, whose one end connects the porous wick and whose the other end longitudinally extends to the condensing portion.

Description

    BACKGROUND OF THE INVENTION
  • 1. Technical Field
  • The invention generally relates to heat transfer elements, particularly to heat pipes.
  • 2. Related Art
  • A heat pipe is a heat transfer element which employing phase transition to efficiently transfer heat between two solid interfaces. Usually, an evaporating portion and a condensing portion are separately defined at two ends of a heat pipe. At the evaporating portion, a work fluid within the heat pipe turns into a vapor by absorbing the heat. The vapor condenses back into a liquid at the condensing portion, releasing the latent heat by a heat sink. The liquid then returns to the evaporating portion through either capillary action or gravity action where it evaporates once more and repeats the cycle.
  • In practice, heat pipes are not always arranged in a direction that the evaporating portion is downward. Sometimes a heat pipe may be arranged reversely or obliquely. This tends to make the work fluid which is in liquid phase and is flowing back contained by gravity. In a traditional heat pipe, the wick structure is placed on an inner wall of the pipe. Thus only a part of wick structure can provide a capillary force to push the work fluid when the heat pipe is slant. The efficiency of flowing back of the work fluid is not good enough.
    • SUMMARY OF THE INVENTION
  • An object of the invention is to improve the efficiency of flowing back of work fluid regardless of the direction of heat pipe.
  • To accomplish the above object, the heat pipe of the invention includes a tube in which an evaporating portion and a condensing portion are defined; a grooved wick longitudinally and entirely disposed on an inner wall of the tube and communicating the evaporating portion with the condensing portion; a porous wick only disposed on the inner wall of the evaporating portion and covering the grooved wick in the evaporating portion; and a fiber wick in a shape of a strip, whose one end connects the porous wick and whose the other end longitudinally extends to the condensing portion.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a longitudinal sectional view of the first embodiment of the invention;
  • FIG. 2 is a cross-sectional view along line 2-2 in FIG. 1;
  • FIG. 3 is a cross-sectional view along line 3-3 in FIG. 1;
  • FIG. 4 is a partially sectional view of the first embodiment of the invention;
  • FIG. 5 shows a typical application of the first embodiment of the invention;
  • FIG. 6 is a cross-sectional view of the evaporating portion of the second embodiment of the invention; and
  • FIG. 7 is a cross-sectional view of the condensing portion of the second embodiment of the invention.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • Please refer to FIGS. 1 and 4. The heat pipe of the invention includes a tube 10, a grooved wick 11, a porous wick 12 and a fiber wick 13.
  • An evaporating portion 100 and a condensing portion 101 are defined in the tube 10. In the shown embodiment, the evaporating portion 100 and the condensing portion 101 are separately located at two ends of the tube 10. Of course, there may be a plurality of evaporating portions 100 or condensing portions 101. The grooved wick 11 is longitudinally and entirely disposed on an inner wall of the tube 10 and communicates the evaporating portion 100 and the condensing portion 101. A work fluid (not shown) contained in the tube 10 may flow back from the condensing portion 101 to the evaporating portion 100 through the grooved wick 11.
  • The porous wick 12 is made of sintered powder. The porous wick 12 is only disposed on the inner wall of the evaporating portion 100 and covers the grooved wick 11 in the evaporating portion 100.
  • Please refer to FIGS. 2 and 3. The fiber wick 13 is a strip of woven fiber or metallic wires. One end 130 of the strip of fiber wick 13 connects to the porous wick 12 as shown in FIG. 3. For example, the end 130 is sintered together with the porous wick 12 when the porous wick 12 is being sintered. The other end 131 of the fiber wick 13 longitudinally extends to the condensing portion 101 as shown in FIG. 2. In this embodiment, the end 131 of the fiber wick 13 is just placed at the condensing portion 101 without any fastening. Preferably, a cross-sectional area of the fiber wick 13 is about one eighth of that of the tube 10.
  • As shown in FIG. 5, the evaporating portion 100 is touched by a heat source 2 and the condensing portion 101 is connected with fins 3. When the heat source 2 is generating heat, the work fluid in the porous wick 12 starts evaporating. The evaporated work fluid will move to the condensing portion 101 because the porous wick 12 is only located in the evaporating portion 100. The evaporated work fluid will further condense by releasing heat to the fins 3. Then the condensed work fluid flows back the evaporating portion 100 through the grooved wick 11. If the heat pipe 1 is arranged in a direction disadvantageous to the flowing back of the work fluid, the distal end 131 of the fiber wick 13 will naturally pend because of gravity. The pendent fiber wick 13 will reach and absorb the condensed work fluid to transfer it back to the porous wick 12 in the evaporating portion 100. The efficiency of heat transfer of the heat pipe 1 can be increased.
  • Additionally, the tube 10 of the heat pipe 1 also can be flat so as to make the fiber wick 13 in the condensing portion 101 gripped by the tube 10 as shown in FIG. 7. But the fiber wick 13 in the evaporating portion 100 is pressed by the porous wick 12 and not touched by the tube 10.
  • While the forgoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. As such, the appropriate scope of the invention is to be determined according to the claims.

Claims (10)

What is claimed is:
1. A heat pipe with composite wick structure, comprising:
a tube in which an evaporating portion and a condensing portion are defined;
a grooved wick substantially longitudinally and entirely disposed on an inner wall of the tube and communicating the evaporating portion with the condensing portion;
a porous wick only disposed on the inner wall of the evaporating portion and covering the grooved wick in the evaporating portion; and
a fiber wick in a shape of a strip, wherein one end of the fiber wick connects the porous wick and the other end thereof longitudinally extends to the condensing portion.
2. The heat pipe with composite wick structure of claim 1, wherein the evaporating portion is located at one end of the tube.
3. The heat pipe with composite wick structure of claim 2, wherein the condensing portion is located at the other end of the tube.
4. The heat pipe with composite wick structure of claim 1, wherein the porous wick is sintered powder.
5. The heat pipe with composite wick structure of claim 4, wherein one end of the fiber wick is sintered together with the porous wick.
6. The heat pipe with composite wick structure of claim 1, wherein one end of the fiber wick is sintered together with the porous wick.
7. The heat pipe with composite wick structure of claim 1, wherein the fiber wick is woven fiber.
8. The heat pipe with composite wick structure of claim 1, wherein the fiber wick is woven metallic wires.
9. The heat pipe with composite wick structure of claim 1, wherein the other end of the fiber wick is placed in the condensing portion without fastening.
10. The heat pipe with composite wick structure of claim 1, wherein the tube is flat in shape and the fiber wick in the condensing portion is gripped by the tube.
US12/873,253 2010-08-31 2010-08-31 Heat pipe with composite wick structure Abandoned US20120048517A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/873,253 US20120048517A1 (en) 2010-08-31 2010-08-31 Heat pipe with composite wick structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/873,253 US20120048517A1 (en) 2010-08-31 2010-08-31 Heat pipe with composite wick structure

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2508057A (en) * 2012-08-21 2014-05-21 I & I Developments Ltd Volatile material dispenser with emanator having extending fibres
US20140166244A1 (en) * 2012-12-17 2014-06-19 Foxconn Technology Co., Ltd. Flat heat pipe and method for manufacturing the same
US20140174701A1 (en) * 2012-12-21 2014-06-26 Elwha Llc Heat Pipe
US20140305616A1 (en) * 2013-04-12 2014-10-16 Wistron Corp. Thin heating pipe
JP5685656B1 (en) * 2014-01-17 2015-03-18 株式会社フジクラ heat pipe
JP5759600B1 (en) * 2014-07-16 2015-08-05 株式会社フジクラ Flat heat pipe
US20160153722A1 (en) * 2014-11-28 2016-06-02 Delta Electronics, Inc. Heat pipe
US20170160018A1 (en) * 2015-12-04 2017-06-08 Tai-Sol Electronics Co., Ltd. Heat pipe with fiber wick structure
US9952000B1 (en) 2015-04-15 2018-04-24 Advanced Cooling Technologies, Inc. Constant conductance heat pipe assembly for high heat flux
US10358945B2 (en) 2012-12-21 2019-07-23 Elwha Llc Heat engine system
US10638639B1 (en) 2015-08-07 2020-04-28 Advanced Cooling Technologies, Inc. Double sided heat exchanger cooling unit
WO2020137569A1 (en) * 2018-12-28 2020-07-02 古河電気工業株式会社 Heatsink
US10837712B1 (en) 2015-04-15 2020-11-17 Advanced Cooling Technologies, Inc. Multi-bore constant conductance heat pipe for high heat flux and thermal storage
WO2021208730A1 (en) * 2020-04-15 2021-10-21 华为技术有限公司 Two-phase phase change heat dissipation device and terminal apparatus
US11454456B2 (en) 2014-11-28 2022-09-27 Delta Electronics, Inc. Heat pipe with capillary structure

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060086482A1 (en) * 2004-10-25 2006-04-27 Thayer John G Heat pipe with axial and lateral flexibility
US20060196641A1 (en) * 2005-01-28 2006-09-07 Chu-Wan Hong Screen mesh wick and method for producing the same
US20060243426A1 (en) * 2004-04-21 2006-11-02 Hul-Chun Hsu Wick Structure of Heat Pipe
US20060283574A1 (en) * 2005-06-15 2006-12-21 Top Way Thermal Management Co., Ltd. Thermoduct
US20070006993A1 (en) * 2005-07-08 2007-01-11 Jin-Gong Meng Flat type heat pipe
US20070089864A1 (en) * 2005-10-24 2007-04-26 Foxconn Technology Co., Ltd. Heat pipe with composite wick structure
US20070236887A1 (en) * 2006-04-10 2007-10-11 Inventec Corporation Heatsink module of heat-generating electronic elements on circuit board
US20070240859A1 (en) * 2006-04-17 2007-10-18 Chaun-Choung Technology Corp. Capillary structure of heat pipe
US20070267179A1 (en) * 2006-05-19 2007-11-22 Foxconn Technology Co., Ltd. Heat pipe with composite capillary wick and method of making the same
US20090020269A1 (en) * 2007-07-18 2009-01-22 Foxconn Technology Co., Ltd. Heat pipe with composite wick structure
US20090020268A1 (en) * 2007-07-20 2009-01-22 Foxconn Technology Co., Ltd. Grooved heat pipe and method for manufacturing the same

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060243426A1 (en) * 2004-04-21 2006-11-02 Hul-Chun Hsu Wick Structure of Heat Pipe
US20060086482A1 (en) * 2004-10-25 2006-04-27 Thayer John G Heat pipe with axial and lateral flexibility
US20060196641A1 (en) * 2005-01-28 2006-09-07 Chu-Wan Hong Screen mesh wick and method for producing the same
US20060283574A1 (en) * 2005-06-15 2006-12-21 Top Way Thermal Management Co., Ltd. Thermoduct
US20070006993A1 (en) * 2005-07-08 2007-01-11 Jin-Gong Meng Flat type heat pipe
US20070089864A1 (en) * 2005-10-24 2007-04-26 Foxconn Technology Co., Ltd. Heat pipe with composite wick structure
US20070236887A1 (en) * 2006-04-10 2007-10-11 Inventec Corporation Heatsink module of heat-generating electronic elements on circuit board
US20070240859A1 (en) * 2006-04-17 2007-10-18 Chaun-Choung Technology Corp. Capillary structure of heat pipe
US20070267179A1 (en) * 2006-05-19 2007-11-22 Foxconn Technology Co., Ltd. Heat pipe with composite capillary wick and method of making the same
US20090020269A1 (en) * 2007-07-18 2009-01-22 Foxconn Technology Co., Ltd. Heat pipe with composite wick structure
US20090020268A1 (en) * 2007-07-20 2009-01-22 Foxconn Technology Co., Ltd. Grooved heat pipe and method for manufacturing the same

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2508057A (en) * 2012-08-21 2014-05-21 I & I Developments Ltd Volatile material dispenser with emanator having extending fibres
US20140166244A1 (en) * 2012-12-17 2014-06-19 Foxconn Technology Co., Ltd. Flat heat pipe and method for manufacturing the same
US9752832B2 (en) * 2012-12-21 2017-09-05 Elwha Llc Heat pipe
US20140174701A1 (en) * 2012-12-21 2014-06-26 Elwha Llc Heat Pipe
US10358945B2 (en) 2012-12-21 2019-07-23 Elwha Llc Heat engine system
US20140305616A1 (en) * 2013-04-12 2014-10-16 Wistron Corp. Thin heating pipe
JP2015135211A (en) * 2014-01-17 2015-07-27 株式会社フジクラ heat pipe
JP5685656B1 (en) * 2014-01-17 2015-03-18 株式会社フジクラ heat pipe
JP2016023821A (en) * 2014-07-16 2016-02-08 株式会社フジクラ Flat heat pipe
JP5759600B1 (en) * 2014-07-16 2015-08-05 株式会社フジクラ Flat heat pipe
US20160153722A1 (en) * 2014-11-28 2016-06-02 Delta Electronics, Inc. Heat pipe
US11892243B2 (en) 2014-11-28 2024-02-06 Delta Electronics, Inc. Heat pipe with capillary structure
US11454456B2 (en) 2014-11-28 2022-09-27 Delta Electronics, Inc. Heat pipe with capillary structure
US10502497B1 (en) 2015-04-15 2019-12-10 Advanced Cooling Technologies, Inc. Constant conductance heat pipe assembly for high heat flux
US10837712B1 (en) 2015-04-15 2020-11-17 Advanced Cooling Technologies, Inc. Multi-bore constant conductance heat pipe for high heat flux and thermal storage
US9952000B1 (en) 2015-04-15 2018-04-24 Advanced Cooling Technologies, Inc. Constant conductance heat pipe assembly for high heat flux
US10638639B1 (en) 2015-08-07 2020-04-28 Advanced Cooling Technologies, Inc. Double sided heat exchanger cooling unit
US20170160018A1 (en) * 2015-12-04 2017-06-08 Tai-Sol Electronics Co., Ltd. Heat pipe with fiber wick structure
WO2020137569A1 (en) * 2018-12-28 2020-07-02 古河電気工業株式会社 Heatsink
WO2021208730A1 (en) * 2020-04-15 2021-10-21 华为技术有限公司 Two-phase phase change heat dissipation device and terminal apparatus

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AS Assignment

Owner name: KUNSHAN JUE-CHUNG ELECTRONICS CO., LTD., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HUANG, YU- PO;KUO, TUNG-JUNG;REEL/FRAME:024920/0947

Effective date: 20100824

STCB Information on status: application discontinuation

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