JP2004053128A - Flat tube for heat exchanger and its manufacturing method - Google Patents

Flat tube for heat exchanger and its manufacturing method Download PDF

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Publication number
JP2004053128A
JP2004053128A JP2002210950A JP2002210950A JP2004053128A JP 2004053128 A JP2004053128 A JP 2004053128A JP 2002210950 A JP2002210950 A JP 2002210950A JP 2002210950 A JP2002210950 A JP 2002210950A JP 2004053128 A JP2004053128 A JP 2004053128A
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Japan
Prior art keywords
flat tube
heat exchanger
slit
sheet material
brazing
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Japanese (ja)
Inventor
Satoru Hirasawa
平澤　悟
Masayuki Mimoda
三百田　昌之
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OKA KOGYO KK
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OKA KOGYO KK
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Priority to JP2002210950A priority Critical patent/JP2004053128A/en
Publication of JP2004053128A publication Critical patent/JP2004053128A/en
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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
    • 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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat tube for a heat exchanger capable of being brazed with a single-sided cladding material in which a brazing material is cladded only on singe side of a core body and being manufactured at a low cost, and to provide its manufacturing method. <P>SOLUTION: The tube is formed by bending a single sheet material 11 in which the brazing material 15 is cladded on the surface 13 side of the core body 12. Abutting parts 20, 21 are formed to the inside of the tube with folded surfaces 13 facing inwardly, and slit parts 25, 26 are pierced in the end parts of the abutting parts 20, 21 wherein the slit parts 25, 26 pierce the core body 12 from the surface of the sheet material 11 to reach the back face 14. Moreover, the brazing material 15 in the surface 13 flows out to the back face 14 via the slit parts 25, 26 to perform brazing in the back face 14. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、カーエアコン等に組み込まれる熱交換器用扁平チューブに関し、特に、芯体の一面側にろう材がクラッドされた単一のシート材が折り曲げ成形されてなる扁平チューブ成形品に関する。
【０００２】
【従来の技術】
例えば、特開平５−１８０５８９号、特開平１０−１９３０８５号、特開２００１−５０６７６号、特開２００１―９１１７８号の各公報に記載されるように、カーエアコン等の熱交換器用チューブとして、アルミニウム合金からなる帯状金属板を曲折して成形された熱交換器用扁平チューブが用いられている。この種の熱交換器用扁平チューブは、帯状金属板を成形ロールにより幅方向に曲折して扁平管状に成形されるのであるが、薄肉の管壁を補強するために管壁相互を部分的にろう付けして補強壁を設けることが行われている。
【０００３】
このろう付けは、帯状金属板として芯体の両面側にろう材がクラッドされたブレージングシートを用い、このシートの折り重ねによるチューブ内方への突き合わせ部を補強壁として設け、これを高温で加熱することにより、該ろう材を介してチューブ成形体内部でろう付け固定を行っている。
【０００４】
また、内部での補強壁のろう付けとともに外部においてフィンもろう付けされるため、上記の通り、芯体の両面側がろう材でクラッドされた３層構造のシート材を用いる必要があり、生産コストが高くなってしまうという問題があった。
【０００５】
【発明が解決しようとする課題】
この発明は、前記の点に鑑みなされたもので、ろう材が芯体の片面にのみクラッドされた片面クラッド材でもろう付けが可能である熱交換器用扁平チューブ及びその製法を提供するものである。
【０００６】
【課題を解決するための手段】
すなわち、請求項１の発明は、芯体の一面側にろう材がクラッドされた単一のシート材が折り曲げ成形されてなる扁平チューブ成形品であって、前記扁平チューブ成形品は、前記ろう材がクラッドされた表面を内側とする折り重ねによるチューブ内方への突き合わせ部が形成されており、前記突き合わせ部先端部にはシート材の表面から芯体を貫通して裏面に至るスリット部が貫設されているとともに、前記スリット部を介して表面側のろう材が裏面側に流出して該裏面側においてろう付け固定されるように構成されていることを特徴とする熱交換器用扁平チューブに係る。
【０００７】
また、請求項２の発明は、チューブ内方への突き合わせ部が互いに対向して形成されており、前記各突き合わせ部先端部のスリット部が互い違いになるような位置に貫設されている請求項１に記載の熱交換器用扁平チューブに係る。
【０００８】
さらに、請求項３の発明は、芯体の一面側にろう材がクラッドされた単一のシート材を折り曲げ成形によって扁平チューブ成形品に成形するに際し、前記ろう材がクラッドされた表面を内側とする折り重ねによるチューブ内への突き合わせ部を形成するとともに、前記突き合わせ部先端部にシート材の表面から芯体を貫通して裏面に至るスリット部を貫設することを特徴とする熱交換器用扁平チューブの製法に係る。
【０００９】
【発明の実施の形態】
以下添付の図面に従ってこの発明を詳細に説明する。
図１はこの発明の熱交換器用扁平チューブの部分斜視図、図２は図１の矢印２部分の拡大断面図、図３はこの発明の熱交換器用扁平チューブの他の例を示す部分斜視図、図４は図３の矢印４部分の拡大断面図、図５は図１の熱交換器用扁平チューブの製造工程の前半を示す断面図、図６は図１の熱交換器用扁平チューブの製造工程の後半を示す断面図、図７はスリット部を形成したシート材の上面図、図８は図３の熱交換器用扁平チューブの製造工程の前半を示す断面図、図９は図３の熱交換器用扁平チューブの製造工程の後半を示す断面図である。
【００１０】
図１及び図２に示したように、請求項１の発明に係る熱交換器用扁平チューブ１０は、芯体１２の一面側にろう材１５がクラッドされた単一のシート材１１が折り曲げ成形されたものである。シート材１１は従来公知のアルミニウムブレージングシート製の帯状金属板が用いられる。なお、芯体１２としては、例えばＡ３００３、Ａ３００５等の３０００系アルミニウム合金やＡ６９５１等の６０００系アルミニウム合金等が挙げられ、ろう材１５の組成としては、Ｓｉ、フッ化物系フラックス、Ａｌ及び不可避不純物を含むものが一般的である。
【００１１】
そして、前記扁平チューブ成形品１０は、前記ろう材１５がクラッドされた表面１３を内側とする折り重ねによるチューブ内方への突き合わせ部２０，２１が形成されており、前記突き合わせ部２０，２１先端部にはシート材１１の表面１３から芯体１２を貫通して裏面１４に至るスリット部２５，２６が貫設されている。とともに、前記スリット部２５を介して表面１３側のろう材１５が裏面１４側に流出して該裏面１４側においてろう付け固定されるように構成されている。図２において符号３０は裏面１４側に流出したろう材１５によるろう付け固定部を表す。なお、図１の符号１９はシート材１１の端部合着部で、この合着部１９もろう付けされることはいうまでもない。
【００１２】
図１及び図２の扁平チューブ成形品１０はチューブ内方への突き合わせ部２０，２１が対向して形成され、その突き合わせ部２０，２１先端でろう付け固定部３０が形成された例である。この場合においては、請求項２の発明として規定し図２に図示したように、各突き合わせ部２０，２１先端部のスリット部２５，２６（破線部分）が互い違いになるような位置に貫設されておれば、ろう付け接合を直線的に連続して行うことができ、好ましい。
【００１３】
図３及び図４に図示の熱交換器用扁平チューブ１０Ａは、チューブ内方への突き合わせ部２２が一側からのみ形成され、該突き合わせ部２２の先端部のスリット部２７を介してシート材１１の裏面１４側でろう付け接合がなされるものである。この例では、スリット部２７に対応してろう付け部３１が形成されるので、ろう付け接合はある程度断続的となる。図において、前出と同一符号は同一の構成を表す。
【００１４】
次に、請求項３の発明として規定する熱交換器用扁平チューブの製法について述べる。なお、前記した対向する突き合わせ部２０，２１を有する扁平チューブ１０については図５ないし図７が図示され、一側にのみ突き合わせ部２２を有する扁平チューブ１０Ａについては図８及び図９が図示される。以下、説明する。
【００１５】
図５及び図６の（ａ）から（ｉ）の順に示すように、芯体１２の一面側にろう材１５がクラッドされた単一のシート材１１は、公知のロール成形等による折り曲げ成形によって扁平チューブ成形品１０に成形される。この発明においては、図５の（ａ）及び（ｂ）のように、シート材１１の所定位置に、ろう材１５がクラッドされた表面１３を内側とする折り重ねによる突き合わせ部２０，２１が形成される。
【００１６】
そして、図５の（ｃ）のように、前記突き合わせ部２０，２１の先端部にシート材１１の表面１３から芯体１２を貫通して裏面１４に至るスリット部２５，２６が貫設される。このスリット部２５，２６の形成は、所定間隔でスリット刃物が設けられたスリットロール４０，４１によって行うことができる。
【００１７】
この例では、前記したように、突き合わせ部２０，２１の対向するスリット部２５，２６が互い違いとなるように形成される。図７は、図５の（ｃ）におけるスリットロール４０，４１によるシート材１１のスリット部２５，２６の位置関係を表したものであるが、図中の補助線（鎖線）のように、スリット部２５，２６は互い違いに形成される。
【００１８】
スリット部２５，２６が形成されたシート材１１は、次いで（ｅ）（ｆ）のように二つ折りされる。さらに、図６の（ｇ）ないし（ｉ）に示すように、各突き合わせ部２０，２１を対向して突き合わせ、端部合着部１９Ａ，１９Ｂを合着して扁平チューブ１０に成形する。
【００１９】
図８及び図９は、一側にのみ突き合わせ部２２を有する扁平チューブ１０Ａの成形に関する。この例については、突き合わせ部２２に対してスリットロール４２によってスリット部２７が形成されるほか、前記とほぼ同様であるので、各図に符号を付すにとどめて、説明を省略する。
【００２０】
このようにして成形した扁平チューブ１０、１０Ａをその表面側に図示しないフィンを配置した状態で高温の炉内に入れ、ろう材１５を溶融させる。これにより、前記突き合わせ部２０、２１、２２の内側に折り込まれた表面１３のろう材１５が前記スリット部２５、２６、２７を介して表面１３側から裏面１４側へと流出し該裏面１４側において当該突き合わせ部２０、２１、２２がろう付け固定される。また、これと合わせて前記シート材１１の側部合着部１９及び図示しないフィンとも一体的にろう付け固定される。
【００２１】
【発明の効果】
以上図示し説明したように、この発明の熱交換器用扁平チューブによれば、ろう材がクラッドされた表面を内側とする折り重ねによるチューブ内方への突き合わせ部の先端部にシート材の表面から芯体を貫通して裏面に至るスリット部が貫設されているとともに、前記スリット部を介して表面側のろう材が裏面側に流出して該裏面側においてろう付け固定されているように構成されている。したがって、この構造によれば、ろう材が芯体の片面にのみクラッドされた片面クラッド材でもろう付けが可能となり、製造コストを削減することができる。
【００２２】
また、請求項２の発明のように、チューブ内方への突き合わせ部が互いに対向して形成される場合において、前記各突き合わせ部先端部のスリット部が互い違いになるような位置に貫設されていると、ろう付けの際にはろう材が直線状に連続して流出して接合するので、確実にかつ効率よくろう付け接合ができる。
【００２３】
さらにこの発明は、請求項３の製法発明としても規定したように、従来の成形工程にスリットロール等によってスリット部を配置するだけで、簡単かつ容易に、しかも低コストで実施することができるなど、実際的に極めて大きな利益を享有することができる。
【図面の簡単な説明】
【図１】この発明の熱交換器用扁平チューブの部分斜視図である。
【図２】図１の矢印２部分の拡大断面図である。
【図３】この発明の熱交換器用扁平チューブの他の例を示す部分斜視図である。
【図４】図３の矢印４部分の拡大断面図である。
【図５】図１の熱交換器用扁平チューブの製造工程の前半を示す断面図である。
【図６】図１の熱交換器用扁平チューブの製造工程の後半を示す断面図である。
【図７】スリット部を形成したシート材の上面図である。
【図８】図３の熱交換器用扁平チューブの製造工程の前半を示す断面図である。
【図９】図３の熱交換器用扁平チューブの製造工程の後半を示す断面図である。
【符号の説明】
１０　熱交換器用扁平チューブ
１１　シート材
１２　芯体
１３　表面
１４　裏面
１５　ろう材
２０、２１、２２　突き合わせ部
２５、２６、２７　スリット部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flat tube for a heat exchanger incorporated in a car air conditioner or the like, and more particularly to a flat tube molded product formed by bending a single sheet material in which a brazing material is clad on one surface side of a core body.
[0002]
[Prior art]
For example, as described in JP-A-5-180589, JP-A-10-193850, JP-A-2001-50676, and JP-A-2001-91178, aluminum is used as a tube for a heat exchanger of a car air conditioner or the like. A flat tube for a heat exchanger, which is formed by bending a strip-shaped metal plate made of an alloy, is used. This type of flat tube for a heat exchanger is formed by bending a strip-shaped metal plate in the width direction with a forming roll to form a flat tube.However, in order to reinforce a thin tube wall, the tube walls are partially welded to each other. It has been practiced to provide a reinforcing wall additionally.
[0003]
For this brazing, a brazing sheet in which a brazing material is clad on both sides of the core body as a band-shaped metal plate is used, and a butt portion inward of the tube by folding the sheet is provided as a reinforcing wall, and this is heated at a high temperature. By doing so, brazing is fixed inside the tube molded body via the brazing material.
[0004]
Also, since the fins are brazed on the outside together with the brazing of the reinforcing walls inside, it is necessary to use a three-layered sheet material in which both sides of the core are clad with the brazing material as described above, and the production cost is increased. There was a problem that the cost was high.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and provides a flat tube for a heat exchanger that can be brazed even with a single-sided clad material in which a brazing material is clad only on one surface of a core body, and a method of manufacturing the same. .
[0006]
[Means for Solving the Problems]
That is, the invention according to claim 1 is a flat tube molded product obtained by bending and forming a single sheet material in which a brazing material is clad on one surface side of a core body, wherein the flat tube molded product is the brazing material A butt portion to the inside of the tube is formed by folding with the clad surface inside, and a slit portion penetrating from the surface of the sheet material to the back surface through the core body at the tip of the butt portion. A flat tube for a heat exchanger, wherein the flat tube for a heat exchanger is configured so that the brazing material on the front side flows out to the back side through the slit portion and is brazed and fixed on the back side. Related.
[0007]
The invention according to claim 2 is such that the butting portions toward the inside of the tube are formed so as to face each other, and the slits at the tips of the butting portions are penetrated at positions where the slit portions are alternated. 1. A flat tube for a heat exchanger according to 1.
[0008]
Further, the invention according to claim 3 is that, when a single sheet material in which the brazing material is clad on one side of the core body is formed into a flat tube molded product by bending, the surface in which the brazing material is clad is defined as the inside. A flat portion for the heat exchanger, wherein a butt portion into the tube is formed by folding and a tip portion of the butt portion is provided with a slit extending from the surface of the sheet material to the back surface through the core body. It relates to the method of manufacturing tubes.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 is a partial perspective view of a flat tube for a heat exchanger of the present invention, FIG. 2 is an enlarged cross-sectional view of a portion indicated by an arrow 2 in FIG. 1, and FIG. 3 is a partial perspective view showing another example of the flat tube for a heat exchanger of the present invention. 4 is an enlarged sectional view of a portion indicated by an arrow 4 in FIG. 3, FIG. 5 is a sectional view showing a first half of a manufacturing process of the flat tube for a heat exchanger of FIG. 1, and FIG. 6 is a manufacturing process of a flat tube for a heat exchanger of FIG. 7, FIG. 7 is a top view of a sheet material having a slit formed therein, FIG. 8 is a cross-sectional view showing a first half of a manufacturing process of the flat tube for a heat exchanger of FIG. 3, and FIG. 9 is a heat exchange of FIG. It is sectional drawing which shows the latter half of the manufacturing process of a flat tube for dexterity.
[0010]
As shown in FIGS. 1 and 2, the flat tube 10 for a heat exchanger according to the first aspect of the present invention is formed by bending a single sheet material 11 in which a brazing material 15 is clad on one surface side of a core body 12. It is a thing. As the sheet material 11, a band-shaped metal plate made of a conventionally known aluminum brazing sheet is used. Examples of the core body 12 include a 3000 series aluminum alloy such as A3003 and A3005 and a 6000 series aluminum alloy such as A6951. The brazing material 15 has a composition of Si, a fluoride flux, Al and inevitable impurities. Is generally included.
[0011]
The flat tube molded article 10 has butt portions 20 and 21 inwardly of the tube formed by folding with the surface 13 on which the brazing material 15 is clad inside. Slit portions 25 and 26 extending from the front surface 13 of the sheet material 11 to the back surface 14 through the core body 12 are provided in the portion. At the same time, the brazing material 15 on the front surface 13 flows out to the back surface 14 via the slit portion 25 and is brazed and fixed on the back surface 14 side. In FIG. 2, reference numeral 30 denotes a brazing fixing portion made of the brazing material 15 flowing out to the back surface 14 side. It is needless to say that reference numeral 19 in FIG. 1 denotes an end joining portion of the sheet material 11, and this joining portion 19 is also brazed.
[0012]
The flat tube molded article 10 shown in FIGS. 1 and 2 is an example in which butted portions 20 and 21 facing inward of the tube are formed to face each other, and a brazing fixing portion 30 is formed at the tips of the butted portions 20 and 21. In this case, as shown in FIG. 2 and defined as the second aspect of the invention, the slits 25 and 26 (broken lines) at the tips of the butting portions 20 and 21 are penetrated at alternate positions. This is preferable because brazing can be performed linearly and continuously.
[0013]
The flat tube 10A for a heat exchanger illustrated in FIGS. 3 and 4 has a butt portion 22 formed in the tube only from one side, and the sheet material 11 is formed through a slit portion 27 at the tip of the butt portion 22. The brazing is performed on the back surface 14 side. In this example, since the brazing portion 31 is formed corresponding to the slit portion 27, the brazing connection is somewhat intermittent. In the drawing, the same reference numerals as those described above denote the same components.
[0014]
Next, a method for producing a flat tube for a heat exchanger as defined in the third aspect of the present invention will be described. 5 to 7 are shown for the flat tube 10 having the opposed butting portions 20 and 21 described above, and FIGS. 8 and 9 are shown for the flat tube 10A having the butting portion 22 on one side only. . This will be described below.
[0015]
As shown in FIGS. 5 and 6 from (a) to (i), the single sheet material 11 in which the brazing material 15 is clad on one surface side of the core body 12 is formed by bending by known roll forming or the like. It is molded into a flat tube molded article 10. In the present invention, as shown in FIGS. 5A and 5B, butted portions 20 and 21 are formed at predetermined positions of the sheet material 11 by folding with the surface 13 on which the brazing material 15 is clad inside. Is done.
[0016]
Then, as shown in FIG. 5 (c), slits 25, 26 extending from the front surface 13 of the sheet material 11 to the back surface 14 through the core body 12 are formed at the leading ends of the butting portions 20, 21. . The slit portions 25, 26 can be formed by slit rolls 40, 41 provided with slit blades at predetermined intervals.
[0017]
In this example, as described above, the opposed slit portions 25 and 26 of the butting portions 20 and 21 are formed so as to be alternated. FIG. 7 shows the positional relationship between the slit portions 25 and 26 of the sheet material 11 by the slit rolls 40 and 41 in FIG. 5C. As shown in FIG. The parts 25 and 26 are formed alternately.
[0018]
The sheet material 11 in which the slit portions 25 and 26 are formed is then folded in two as shown in (e) and (f). Further, as shown in (g) to (i) of FIG. 6, the butting portions 20 and 21 face each other, and the end joining portions 19A and 19B are joined to form the flat tube 10.
[0019]
8 and 9 relate to the molding of the flat tube 10A having the butted portion 22 on one side only. This example is substantially the same as the above except that the slit roll 27 is formed by the slit roll 42 with respect to the abutting portion 22. Therefore, only the reference numerals are attached to the respective drawings, and the description is omitted.
[0020]
The flat tubes 10 and 10A thus formed are placed in a high-temperature furnace with fins (not shown) arranged on the surface side, and the brazing material 15 is melted. As a result, the brazing material 15 of the front surface 13 folded inside the butted portions 20, 21, 22 flows out from the front surface 13 side to the rear surface 14 side through the slit portions 25, 26, 27, and At this time, the butted portions 20, 21, 22 are brazed and fixed. At the same time, the sheet material 11 is integrally brazed and fixed to the side joint portion 19 and the fin (not shown).
[0021]
【The invention's effect】
As shown and described above, according to the flat tube for a heat exchanger of the present invention, the front end portion of the abutting portion inwardly into the tube by folding the brazed surface inside the clad surface from the surface of the sheet material. A slit portion penetrating the core body and reaching the back surface is provided therethrough, and the brazing material on the front surface flows out to the back surface side via the slit portion and is brazed and fixed on the back surface side. Have been. Therefore, according to this structure, it is possible to braze even a single-sided clad material in which the brazing material is clad only on one side of the core body, and it is possible to reduce the manufacturing cost.
[0022]
Further, in the case where the butt portions inwardly of the tube are formed to face each other as in the invention of claim 2, the slit portions at the tip portions of the butt portions are penetrated at positions where the slit portions are staggered. In this case, the brazing material flows out and joins in a straight line during brazing, so that brazing can be performed reliably and efficiently.
[0023]
Furthermore, the present invention can be implemented simply and easily and at low cost simply by arranging a slit portion by a slit roll or the like in the conventional molding process, as defined in the manufacturing method of claim 3. In practice, it can enjoy extremely large benefits.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of a flat tube for a heat exchanger of the present invention.
FIG. 2 is an enlarged sectional view of a portion indicated by an arrow 2 in FIG.
FIG. 3 is a partial perspective view showing another example of the flat tube for a heat exchanger of the present invention.
FIG. 4 is an enlarged sectional view of a portion indicated by an arrow 4 in FIG. 3;
FIG. 5 is a cross-sectional view showing a first half of a manufacturing process of the flat tube for a heat exchanger of FIG. 1;
FIG. 6 is a sectional view showing the latter half of the manufacturing process of the flat tube for a heat exchanger of FIG. 1;
FIG. 7 is a top view of a sheet material in which a slit portion is formed.
FIG. 8 is a cross-sectional view showing the first half of the manufacturing process of the flat tube for a heat exchanger of FIG. 3;
FIG. 9 is a sectional view showing the latter half of the manufacturing process of the flat tube for a heat exchanger of FIG. 3;
[Explanation of symbols]
Reference Signs List 10 Flat tube for heat exchanger 11 Sheet material 12 Core body 13 Front surface 14 Back surface 15 Brazing materials 20, 21, 22 Butt portions 25, 26, 27 Slit portions

Claims (3)

芯体の一面側にろう材がクラッドされた単一のシート材が折り曲げ成形されてなる扁平チューブ成形品であって、
前記扁平チューブ成形品は、前記ろう材がクラッドされた表面を内側とする折り重ねによるチューブ内方への突き合わせ部が形成されており、前記突き合わせ部先端部にはシート材の表面から芯体を貫通して裏面に至るスリット部が貫設されているとともに、前記スリット部を介して表面側のろう材が裏面側に流出して該裏面側においてろう付け固定されるように構成されていることを特徴とする熱交換器用扁平チューブ。A flat tube molded product obtained by bending and forming a single sheet material in which a brazing material is clad on one surface side of the core body,
The flat tube molded product has a butt portion inwardly formed by folding the brazed material inside with the clad surface inward, and the butt end portion has a core body from the surface of the sheet material. A slit portion penetrating through to the back surface is provided, and the brazing material on the front side flows out to the back side through the slit portion and is brazed and fixed on the back side. A flat tube for a heat exchanger. チューブ内方への突き合わせ部が互いに対向して形成されており、前記各突き合わせ部先端部のスリット部が互い違いになるような位置に貫設されている請求項１に記載の熱交換器用扁平チューブ。The flat tube for a heat exchanger according to claim 1, wherein butted portions inwardly of the tube are formed so as to face each other, and the slit portions at the tips of the butted portions are penetrated at positions where the slit portions are alternated. . 芯体の一面側にろう材がクラッドされた単一のシート材を折り曲げ成形によって扁平チューブ成形品に成形するに際し、
前記ろう材がクラッドされた表面を内側とする折り重ねによるチューブ内への突き合わせ部を形成するとともに、前記突き合わせ部先端部にシート材の表面から芯体を貫通して裏面に至るスリット部を貫設することを特徴とする熱交換器用扁平チューブの製法。When forming a single sheet material with a brazing material clad on one side of the core body by bending, into a flat tube molded product,
A butt portion into the tube is formed by folding the brazing material with the clad surface on the inside, and a slit portion extending from the surface of the sheet material through the core to the back surface is formed at the tip of the butt portion. A method for producing a flat tube for a heat exchanger, comprising:
JP2002210950A 2002-07-19 2002-07-19 Flat tube for heat exchanger and its manufacturing method Pending JP2004053128A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005010453A1 (en) * 2003-07-25 2005-02-03 T. Rad Co., Ltd. Flat tube for heat exchanger
JP2009127995A (en) * 2007-11-28 2009-06-11 Furukawa Sky Kk Tube for heat exchanger, and heat exchanger with the tube connected with external fin
FR2924794A1 (en) * 2007-12-11 2009-06-12 Valeo Systemes Thermiques Folded or electro-welded tube for brazed heat exchanger of motor vehicle, has brazing layer formed on part of external surfaces of tube, and slots authorizing passage of external brazing on half of length of internal separation wall
WO2010084732A1 (en) * 2009-01-20 2010-07-29 ダイキン工業株式会社 Water heat exhanger and hot-water heat source device
JP2015078821A (en) * 2013-10-18 2015-04-23 株式会社ティラド Flat tube for heat exchanger and manufacturing method thereof
CN105021077A (en) * 2014-05-02 2015-11-04 泰安鼎鑫冷却器有限公司 Two-way continuously-folded high-strength radiating tube
CN105021078A (en) * 2014-05-02 2015-11-04 泰安鼎鑫冷却器有限公司 Bidirectional-folding sextuple-pipe-wall reinforced radiating pipe
US20150375345A1 (en) * 2013-03-19 2015-12-31 Hydro Aluminium Rolled Products Gmbh Method for producing a roll-clad aluminum workpiece, roll-clad aluminum workpiece, and use therefor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005010453A1 (en) * 2003-07-25 2005-02-03 T. Rad Co., Ltd. Flat tube for heat exchanger
JP2009127995A (en) * 2007-11-28 2009-06-11 Furukawa Sky Kk Tube for heat exchanger, and heat exchanger with the tube connected with external fin
FR2924794A1 (en) * 2007-12-11 2009-06-12 Valeo Systemes Thermiques Folded or electro-welded tube for brazed heat exchanger of motor vehicle, has brazing layer formed on part of external surfaces of tube, and slots authorizing passage of external brazing on half of length of internal separation wall
WO2010084732A1 (en) * 2009-01-20 2010-07-29 ダイキン工業株式会社 Water heat exhanger and hot-water heat source device
JP2010190564A (en) * 2009-01-20 2010-09-02 Daikin Ind Ltd Water heat exchanger and hot-water heat source device
JP4666104B2 (en) * 2009-01-20 2011-04-06 ダイキン工業株式会社 Water heat exchanger and hot water heat source equipment
AU2010207400B2 (en) * 2009-01-20 2013-01-31 Daikin Industries, Ltd. Water heat exchanger and hot water heat source apparatus
US20150375345A1 (en) * 2013-03-19 2015-12-31 Hydro Aluminium Rolled Products Gmbh Method for producing a roll-clad aluminum workpiece, roll-clad aluminum workpiece, and use therefor
US10065271B2 (en) * 2013-03-19 2018-09-04 Hydro Aluminium Rolled Products Gmbh Method for producing a roll-clad aluminum workpiece, roll-clad aluminum workpiece, and use therefor
JP2015078821A (en) * 2013-10-18 2015-04-23 株式会社ティラド Flat tube for heat exchanger and manufacturing method thereof
CN105021077A (en) * 2014-05-02 2015-11-04 泰安鼎鑫冷却器有限公司 Two-way continuously-folded high-strength radiating tube
CN105021078A (en) * 2014-05-02 2015-11-04 泰安鼎鑫冷却器有限公司 Bidirectional-folding sextuple-pipe-wall reinforced radiating pipe

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