EP1653186A1 - Flat tube for heat exchanger - Google Patents

Flat tube for heat exchanger Download PDF

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Publication number
EP1653186A1
EP1653186A1 EP04747262A EP04747262A EP1653186A1 EP 1653186 A1 EP1653186 A1 EP 1653186A1 EP 04747262 A EP04747262 A EP 04747262A EP 04747262 A EP04747262 A EP 04747262A EP 1653186 A1 EP1653186 A1 EP 1653186A1
Authority
EP
European Patent Office
Prior art keywords
slits
flat
brazing
flat tube
tube
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.)
Withdrawn
Application number
EP04747262A
Other languages
German (de)
English (en)
French (fr)
Inventor
Takazi Igami
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.)
T Rad Co Ltd
Original Assignee
T Rad 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 T Rad Co Ltd filed Critical T Rad Co Ltd
Publication of EP1653186A1 publication Critical patent/EP1653186A1/en
Withdrawn legal-status Critical Current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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49391—Tube making or reforming

Definitions

  • the present invention relates to an aluminum-made flat tube for heat exchanger having one or more partitions therein, of which cross section is formed in a nearly B-like shape or the like, in particular to an aluminum-made flat tube for heat exchanger, which is formed by bending a strip-shaped metal plate coated with a brazing metal at the outer surface side thereof in the width direction and formed with slits in a top portion of the partition for allowing the brazing metal at the outer surface side to enter into the inner surface side through the slits for brazing the partition and the inner wall surface.
  • a flat tube having a nearly B-like shape or the like in section in which slits are intermittently formed in a top portion of a partition positioned in the central area thereof so as to allow a brazing metal at the outer surface side of the tube to enter into the inner surface side through the slits while brazing to integrally fix the top portion of the partition and the opposed inner surface of the tube by means of brazing; thereby the performance against the pressure is increased (for example, refer to Figs. 8 and 9 in Japanese Patent Application Laid-open No. 2002-228369).
  • the inner surface side of the core metal of the flat tube is clad with a sacrificial anode material, and the outer surface side is clad with a brazing metal.
  • a brazing metal at the outer surface side of the tube is allowed to enter into the inner surface side through slits formed in the top portion thereof.
  • an object of the present invention is to determine experimentally optimum conditions for the slits formed in the top portion of the partition in a flat tube having one or more partitions and formed into a B-like shape in section.
  • An aspect of the present invention is a flat tube for heat exchanger, which includes:
  • Another aspect of the present invention is the flat tube for heat exchanger according to claim 1, wherein the thickness of the strip-shaped metal plate is 0.15 mm to 0.6 mm.
  • the flat tube for heat exchanger according to the present invention has a structure as described above, and provides the following effects.
  • the flat tube for heat exchanger is structured so that the top portion 5 of the turned-up portion 4, which is formed in the central portion in the width direction of the flat face portion 1, abuts on the inner surface at opposite side thereto to form a partition in the tube, wherein many slits 6 are formed intermittently being separated away from each other in the top portion 5, and the length of the slits 6 is 2 mm to 15 mm; the distance between the edges of the neighboring slits 6 is 3 mm to 10 mm; and "e/c" is 0.6 or more. Accordingly, a highly reliable flat tube for heat exchanger having a satisfactory brazing strength between the top portion 5 and the inner surface at the opposite side, which provides a high performance against the pressure and which generates no deformation nor twist while the flat tube is being formed, is provided.
  • the brazing metal reliably enters to the inner surface side through the slits 6 while brazing, the reliability on the brazing is ensured.
  • the length of the slits 6 is prescribed to 15 mm or less, the working accuracy to form the turned-up portion 4 by bending the strip-shaped metal plate in the width direction thereof can be highly maintained; as a result, the reliability on the flat tube for heat exchanger can be maintained.
  • the distance between the edges of the neighboring slits 6 is prescribed to 3 mm or more, no crack is generated between the edges of the slits 6, a highly reliable flat tube can be provided.
  • the distance between the edges of the neighboring slits 6 is prescribed to 10 mm or less, the fillet of brazed point in the top portion 5 is formed satisfactorily while brazing, a flat tube for heat exchanger with high strength and performance against the pressure can be provided.
  • Fig. 1 shows a cross sectional view illustrating a relevant portion of a flat tube according to the present invention
  • Fig. 2 is a cross sectional view illustrating a state of use of a relevant portion after brazing
  • Fig. 3 shows a perspective view schematically showing a turned-up portion 4 shown in Fig. 1.
  • the flat tube for heat exchanger is formed by bending an aluminum strip-shaped metal plate in the width direction into a nearly B-like shape in section.
  • a brazing sheet is used as for the strip-shaped metal plate.
  • the outer surface side of the core metal is coated with a brazing metal of an aluminum alloy up to approximately 10% of the total thickness of the plate; and the inner surface side of the core metal is coated with a sacrificial anode material of an aluminum alloy up to approximately 10% of the total thickness of the plate.
  • the total thickness of the strip-shaped metal plate is approximately 0.15 mm to 0.6 mm.
  • the flat tube 8 is formed in a cylindrical shape by a pair of flat face portions 1 opposed parallelly to each other and a pair of curved portions 2 with which both ends of the flat face portions 1 are connected. And in the central portion in the width direction of one flat face portion 1, a turned-up portion 4, which is bent up toward the opposed flat face side, is formed.
  • Both end edge portions 9 and 10 of the strip-shaped metal plate are overlapped with each other.
  • One end edge portion 10 is formed in a stepped shape, and on the outer surface thereof, the inner surface of the end edge portion 9 abuts.
  • the inner surface of the one end edge portion 10 abuts on the top portion 5 of the turned-up portion 4.
  • slits 6 for allowing a brazing metal to enter therethrough are formed intermittently being separated away from each other in the longitudinal direction.
  • the above slits 6 are formed in the following manner. That is, in a state of the strip-shaped metal plate before bending, the slits 6 are formed as shown in Fig. 4; and then the strip-shaped metal plate is bent back at the slits 6 as the center.
  • the length "c" of the slits 6 is 2 mm to 15 mm.
  • the distance "e” between the edges of the neighboring slits 6 is 3 mm to 10 mm; and "e/c" is 0.6 or more.
  • Fig. 5 shows a cross sectional view of another flat tube for heat exchanger according to the present invention.
  • the slits 6 formed in the top portion 5 of the turned-up portion 4 are identical to those shown in Fig. 1 and Fig. 3.
  • Fig. 6 shows still another embodiment according to the present invention.
  • a turned-up portion 4 and a turned-up portion 4a are formed respectively by bending in the central portion in the width direction of a pair of flat face portions 1 being opposed to each other, and the respective top portions abut on each other.
  • slits 6 are formed in the top portion 5 of the turned-up portion 4.
  • the length of the slits 6 and the distance therebetween are identical to those shown in Fig. 1.
  • one end edge portion 9 and the other edge portion 10 of the strip-shaped metal plate are overlapped with each other at an end portion of the flat tube 8.
  • a single turned-up portion 4 is formed to form a single partition.
  • two or more turned-up portions may be formed to form a plurality of partitions.
  • the joint structure of the partition may employ another mode.
  • it is limited to the structure in which many intermittent slits 6 are formed in the top portion of the turned-up portion 4.
  • the brazing metal at the outer surface side of the tube enters into the top portion 5 of the turned-up portion 4 from the slits 6, and continuously fixes the top portion 5 and the inner surface of the tube abutting therewith in a brazing manner. Simultaneously, the outer surfaces of the overlapped turned-up portion 4 are also brazed integrally.
  • slits 6 for allowing the brazing metal to enter therethrough are formed intermittently being separated away from each other in the longitudinal direction of the top portion 5.
  • the length "c" of the slits 6 is 2 mm to 15 mm; the distance “e” between the edges of the neighboring slits 6 is 3 mm to 10 mm; and "e/c” is 0.6 or more.
  • the thickness of the brazing metal 3 coated on the respective outer surfaces was 10% of the total thickness of the plate.
  • various flat tubes of which slit length "c" was 2 mm to 15 mm were formed, and prepared so that the length (gap) "e” between the edges of the slits was 3 mm to 10 mm; and "e/c" was 0.6 or more.
  • the length of the tubes for experiments was 60 mm.
  • the tubes were placed in a high temperature furnace to melt the brazing metal and then cooled down. The state of the brazing was examined.
  • the brazing metal failed to enter satisfactorily through the slits and defective brazing was found.
  • the distance "e" between the edges of slits was larger than 10 mm, it was found that a portion without fillet of brazed point (not brazed portion) exceeded 1/3 of the distance "e" between the edges, and the total strength of the flat tube was not satisfactory.
  • the reason of the above is as described below. That is, in the portion with no slit between the edges, the fillet of brazed point was formed with the brazing metal, which entered through the slits while brazing, and the length of the entered metal was constant. Accordingly, when the distance between edges is too large, a large portion having no fillet of brazed point was made resulting in a reduced strength.
  • the thickness of the plate of the tube was 0.2 mm, 0.3 mm or 0.4 mm.
  • the length of the slits has to be 15 mm or less; and the distance "e” between the edges of slits has to be 3 mm or more; and “e/c” has to be 0.6 or more.
  • the above ranges are exceeded, cracks or twists are generated between the edges of slits while the flat tube is being formed and is not suitable to be used as the flat tube. That is, when the length of the slits exceeds 15 mm, cracks or twists are generated while the flat tube is being formed. Also, when the distance between the edges of slits is 2 mm or smaller, cracks are generated while the flat tube is being formed. Further, when the "e/c" is smaller than 0.6, cracks are generated while the flat tube is being formed.
  • the thickness of the plate of the tube is 0.2 mm, 0.3 mm or 0.4 mm.
  • the slit length "c" is 2 mm to 15 mm; the distance "e” between the edges of slits 6 is 3 mm to 10 mm; and "e/c" is 0.6 or more.
EP04747262A 2003-07-25 2004-07-02 Flat tube for heat exchanger Withdrawn EP1653186A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003280425A JP2005043026A (ja) 2003-07-25 2003-07-25 熱交換器用偏平チューブ
PCT/JP2004/009794 WO2005010453A1 (ja) 2003-07-25 2004-07-02 熱交換器用偏平チューブ

Publications (1)

Publication Number Publication Date
EP1653186A1 true EP1653186A1 (en) 2006-05-03

Family

ID=34100867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04747262A Withdrawn EP1653186A1 (en) 2003-07-25 2004-07-02 Flat tube for heat exchanger

Country Status (5)

Country Link
US (1) US20060180299A1 (ja)
EP (1) EP1653186A1 (ja)
JP (1) JP2005043026A (ja)
CN (1) CN100437010C (ja)
WO (1) WO2005010453A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2924794A1 (fr) * 2007-12-11 2009-06-12 Valeo Systemes Thermiques Tubes multicanaux pour un echangeur de chaleur brase
EP2028431A3 (de) * 2007-08-20 2013-04-24 Behr GmbH & Co. KG Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
FR2986313A1 (fr) * 2012-01-31 2013-08-02 Valeo Systemes Thermiques Tube d'echangeur thermique, echangeur thermique et procede d'obtention correspondant
EP2020582A3 (de) * 2007-07-31 2013-08-28 Behr GmbH & Co. KG Flachrohr für einen Wärmetauscher

Families Citing this family (21)

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Publication number Priority date Publication date Assignee Title
JP4974327B2 (ja) * 2005-12-15 2012-07-11 株式会社デンソー 熱交換器用チューブの製造方法および熱交換器
EP1994352A4 (en) * 2006-01-19 2010-06-02 Modine Mfg Co FLAT TUBE, FLAT TUBE HEAT EXCHANGER AND MANUFACTURING METHOD THEREFOR
US8353335B2 (en) * 2007-02-10 2013-01-15 Modine Manufacturing Company Heat exchanger tube and method of forming the same
DE102007006664A1 (de) * 2007-02-10 2008-08-14 Modine Manufacturing Co., Racine Flachrohr für Wärmetauscher
JP5579364B2 (ja) * 2007-11-28 2014-08-27 株式会社Ｕａｃｊ 熱交換器用チューブ及びこれと外部フィンとを結合した熱交換器
DE102008007610A1 (de) * 2008-02-04 2009-08-06 Behr Gmbh & Co. Kg Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
DE102008007612A1 (de) * 2008-02-04 2009-08-06 Behr Gmbh & Co. Kg Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
DE102008007611A1 (de) * 2008-02-04 2009-08-06 Behr Gmbh & Co. Kg Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
DE102008007600A1 (de) * 2008-02-04 2009-08-06 Behr Gmbh & Co. Kg Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
DE102008007601A1 (de) * 2008-02-04 2009-08-06 Behr Gmbh & Co. Kg Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
DE102008007587A1 (de) * 2008-02-04 2009-08-06 Behr Gmbh & Co. Kg Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
DE102008031614A1 (de) * 2008-07-07 2010-01-14 Behr Gmbh & Co. Kg Wärmeübertrager, insbesondere Wärmeübertrager eines Kraftfahrzeuges, und Verfahren zum Herstellen eines Kühlrohres eines Wärmeübertragers
JP6154611B2 (ja) * 2010-09-27 2017-06-28 株式会社Uacj アルミニウム合金製内面溝付き伝熱管
CN103307915A (zh) * 2012-03-07 2013-09-18 富瑞精密组件（昆山）有限公司 平板热管
CN102997737A (zh) * 2012-11-19 2013-03-27 泰安鼎鑫冷却器有限公司 一种散热器用双管散热管
CN105021077A (zh) * 2014-05-02 2015-11-04 泰安鼎鑫冷却器有限公司 一种双向连续折叠高强度散热管
CN105021078A (zh) * 2014-05-02 2015-11-04 泰安鼎鑫冷却器有限公司 一种双向折叠六重管壁加强型散热管
CN105525980A (zh) * 2014-09-30 2016-04-27 泰安鼎鑫冷却器有限公司 一种耐腐蚀高强度散热管
JP6559517B2 (ja) * 2015-09-16 2019-08-14 株式会社ティラド 熱交換器用偏平チューブの製造方法及びその方法による偏平チューブ
JP6872304B2 (ja) * 2016-08-22 2021-05-19 株式会社ミツトヨ 測定器と外部機器とのユニット
DE102017212271A1 (de) * 2017-07-18 2019-01-24 Mahle International Gmbh Flachrohr

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FR2810727B1 (fr) * 2000-06-21 2003-09-26 Valeo Thermique Moteur Sa Tube plie pour un echangeur de chaleur et echangeur de chaleur comportant de tels tubes
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DE10201511A1 (de) * 2002-01-17 2003-07-31 Behr Gmbh & Co Geschweißtes Mehrkammerrohr
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JP2005037062A (ja) * 2003-07-15 2005-02-10 Toyo Radiator Co Ltd アルミニューム製熱交換器
US20060230617A1 (en) * 2005-04-13 2006-10-19 Kent Scott E Fabricated, brazed metal heat exchanger tube manufacture

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2020582A3 (de) * 2007-07-31 2013-08-28 Behr GmbH & Co. KG Flachrohr für einen Wärmetauscher
EP2028431A3 (de) * 2007-08-20 2013-04-24 Behr GmbH & Co. KG Mehrkammer-Flachrohr, Wärmetauscher und Verwendung eines Wärmetauschers
FR2924794A1 (fr) * 2007-12-11 2009-06-12 Valeo Systemes Thermiques Tubes multicanaux pour un echangeur de chaleur brase
FR2986313A1 (fr) * 2012-01-31 2013-08-02 Valeo Systemes Thermiques Tube d'echangeur thermique, echangeur thermique et procede d'obtention correspondant
WO2013113700A1 (fr) * 2012-01-31 2013-08-08 Valeo Systemes Thermiques Tube d'échangeur thermique, échangeur thermique et procédé d'obtention correspondant
US9975168B2 (en) 2012-01-31 2018-05-22 Valeo Systemes Thermiques Heat exchanger tube, heat exchanger and corresponding production method

Also Published As

Publication number Publication date
WO2005010453A1 (ja) 2005-02-03
CN100437010C (zh) 2008-11-26
US20060180299A1 (en) 2006-08-17
CN1829893A (zh) 2006-09-06
JP2005043026A (ja) 2005-02-17

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