WO2021261574A1 - Flat tube for heat exchangers - Google Patents

Flat tube for heat exchangers Download PDF

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Publication number
WO2021261574A1
WO2021261574A1 PCT/JP2021/024050 JP2021024050W WO2021261574A1 WO 2021261574 A1 WO2021261574 A1 WO 2021261574A1 JP 2021024050 W JP2021024050 W JP 2021024050W WO 2021261574 A1 WO2021261574 A1 WO 2021261574A1
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Prior art keywords
flat tube
aluminum plates
brazing
flat
heat exchanger
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PCT/JP2021/024050
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French (fr)
Japanese (ja)
Inventor
俊一郎 隈
雅章 中島
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株式会社ティラド
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Priority to JP2022532549A priority Critical patent/JPWO2021261574A1/ja
Publication of WO2021261574A1 publication Critical patent/WO2021261574A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding

Definitions

  • the present invention relates to a flat tube for a heat exchanger composed of a joint of a pair of aluminum plates.
  • Patent Document 1 describes a conventional method for manufacturing a flat tube for a heat exchanger and the flat tube thereof.
  • a pair of upper and lower aluminum plates 1 and 2 are opposed to each other, both sides thereof are curved, and the curved portions are overlapped to form a lap portion 11.
  • a folded portion 3 is formed in the intermediate portion in the width direction of each of the aluminum plates 1 and 2, and a slit 12 is intermittently formed in the top portion 3a thereof.
  • the outer surface sides of the core materials 4 and 5 of the aluminum plates 1 and 2 are usually coated with the brazing materials 6 and 7.
  • FIG. 4 is another conventional example.
  • slits 12 are intermittently formed in the planes of the aluminum plates 1 and 2, and the ordinary brazing materials 6 and 7 and the outer surfaces of the aluminum plates 1 and 2 are covered with the slits 12.
  • the applied flux is guided to the top portion 3a of the folded portion 3 through the slit 12.
  • FIG. 5 is another conventional example, in which the inner surfaces of the aluminum plates 1 and 2 are coated with the normal brazing materials 6 and 7 and brazed between the aluminum plates 1 and the aluminum plates 2. Is. In the brazing of FIG. 5, a pair of plates 1 and 2 were combined, and a paste-like flux was applied to the brazed portion, or after assembly, each plate 1 and 2 was dipped into the flux layer and supplied. ..
  • the pair of aluminum plates 1 and 2 are bent in the width direction, respectively, and the pair of flat surface portions 1a and 2a facing each other are formed.
  • a flat tube for heat exchanger in which the top portion 3a of the folded portion 3 is abutted against a flat surface portion facing the surface and the abutting portion is brazed.
  • the outer surfaces of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with normal brazing materials 6 and 7 containing no Mg.
  • the inner surface of the core material 4 of at least one of the aluminum plates 1 is coated with the Mg-containing brazing material 8 containing Mg.
  • the Mg content is 0.1 to 1.0 wt%, and the Mg content is 0.1 to 1.0 wt%.
  • Both aluminum plates 1 and 2 are flat tubes for heat exchangers, characterized in that they are joined together without the use of flux on their inner surfaces.
  • the present invention according to claim 2 is the flat tube for heat exchanger according to claim 1.
  • the inner surfaces of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with Mg-containing brazing materials 8 and 9 containing Mg. These are flat tubes for heat exchangers having an Mg content of 0.1 to 0.5 wt%.
  • the present invention according to claim 3 is the flat tube for heat exchanger according to any one of claims 1 and 2.
  • the inner surface of the core material 4 of at least one of the aluminum plates 1 is coated with the Mg-containing brazing material 8 containing Mg, and the Mg is used as the base material in the brazing process. Since the oxide film on the surface is destroyed and removed, it is possible to join between the top portion 3a of the folded portion 3 and the flat surface portion 2a facing each other without using flux. Further, since the conventional slit for guiding the brazing material is not required, the problem of brazing failure due to the inconsistency between the slit and the flat surface portion does not occur.
  • the oxide film on the surface of the base material is removed without excess or deficiency by the Mg during brazing.
  • the inner surfaces of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with Mg-containing brazing materials 8 and 9 containing 0.1 to 0.5 wt% Mg. At the time of brazing, the oxide film on the surface of the base metal is removed without excess or deficiency by the Mg.
  • the corrosion resistance of the inner surface of the flat tube thereof. can be enhanced.
  • FIG. 1 is a flat tube for a heat exchanger of the present invention, and is a cross-sectional view (A) showing a state before brazing and an enlarged view (B) of a portion B of FIG. 1 (A).
  • FIG. 2 is a flat tube for a heat exchanger according to a second embodiment of the present invention, and is a cross-sectional view (A) showing a state before brazing and an enlarged view (B) of a portion B of FIG. 2 (A).
  • FIG. 3 is a cross-sectional view (A) of a conventional flat tube, an enlarged view (B) of a portion B of FIG. 3 (A), and an assembly explanatory view (C) thereof.
  • FIG. 1 is a flat tube for a heat exchanger of the present invention, and is a cross-sectional view (A) showing a state before brazing and an enlarged view (B) of a portion B of FIG. 1 (A).
  • FIG. 2 is a flat tube for a heat exchanger
  • FIG. 4 is a cross-sectional view (A) of another example of the conventional flat tube, an enlarged view (B) of a portion B of FIG. 4 (A), and an assembly explanatory view (C) thereof.
  • FIG. 5 is a cross-sectional view (A) of another example of the conventional flat tube, an enlarged view (B) of a portion B of FIG. 5 (A), and an assembly explanatory view (C) thereof.
  • FIG. 1 shows a flat tube for a heat exchanger according to the first embodiment of the present invention.
  • 1 (A) is a cross-sectional view thereof
  • FIG. 1 (B) is an enlarged view of a portion B of FIG. 1 (A).
  • the flat tube for heat exchanger shown in FIG. 1 is composed of a fitting body of a pair of facing aluminum plates 1 and aluminum plates 2.
  • the flat surface portion 1a of the aluminum plate 1 and the flat surface portion 2a of the aluminum plate 2 face each other, and both the plates 1 and 2 are bent in the width direction to form a pair of side surface portions 1b and 2b.
  • the flat surface portion of at least one of the aluminum plates has a folded-back portion 3 whose intermediate position in the width direction is folded back.
  • the folded portion 3 extends in the longitudinal direction of the flat tube.
  • three folded portions 3 are formed, the top portion 3a thereof is abutted against the inner surface side of the opposite flat surface portion of the flat tube, and the abutting portion is brazed and fixed.
  • the outer surface of the core material 4 of the aluminum plate 1 (the surface forming the outer surface side of the flat tube) is covered with a normal brazing material 6 containing no Mg, and similarly, the outer surface of the core material 5 of the aluminum plate 2 (flat tube).
  • the surface forming the outer surface side of the surface) is coated with a normal brazing material 7 containing no Mg.
  • JIS A3003 material or the like can be used as the core materials 4 and 5 of the aluminum plates 1 and 2. Further, as the normal brazing filler metal 6, JIS A4343 or the like can be used.
  • the inner surface of the core material of one of the aluminum plates may contain Mg.
  • the material 8 is covered.
  • the content of this Mg is 0.1 to 1.0 wt%.
  • the Mg content is less than 0.1%, the brazing property between the top portion 3a of the folded portion 3 and the flat surface portions 1a and 2a cannot be sufficiently ensured.
  • it exceeds 1.0% the Mg concentration in the atmosphere inside the tube becomes excessive, the flow of brazing is obstructed, and the brazing does not spread, so that the brazing property is lowered.
  • the Si content in the Mg-containing brazing material on the surface forming the inner surface of the flat tube is preferably 5 to 13 wt% from the viewpoint of adjusting the fluidity at the time of brazing to an appropriate range.
  • FIG. 1 shows a flat tube for a heat exchanger according to a second embodiment of the present invention.
  • This example differs from the first embodiment in that the inner surfaces (the surfaces forming the inner surface of the flat tube) of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with Mg-containing brazing materials 8 and 9. That is the point.
  • the content of this Mg is 0.1 to 0.5 wt%. With this configuration, the total amount of Mg becomes an appropriate amount, and the aluminum plate 1 and the aluminum plate 2 are surely brazed.
  • the Mg content exceeds 0.5 wt%, the Mg on the inner surface of the aluminum plate 2 reacts with the flux applied to the outer surface of the aluminum plate 1 in the wrap portion 11 of the aluminum plates 1 and 2, and the wrap portion The brazing property of 11 is reduced.
  • a material containing 1 to 4 wt% of Zn may be used as the Mg-containing brazing material.

Abstract

This flat tube is composed of a pair of aluminum plates 1, 2 and has at least one turn-back part 3 in the inner surface; and a top part 3a of the turn-back part 3 and the aluminum plates 1, 2 facing the top part are reliably brazed to each other without applying a flux to the inner surface. The outer surfaces of core materials 4, 5 of the aluminum plates 1, 2 are covered with conventional brazing materials 6, 7 that do not contain Mg; and the inner surface of the core material 4 of at least one of the aluminum plates, namely the aluminum plate 1, is covered with a brazing material 8 that contains Mg, with the Mg content thereof being from 0.1 wt% to 1.0 wt%.

Description

熱交換器用偏平チューブFlat tube for heat exchanger
　本発明は、一対のアルミニウムプレートの接合体からなる熱交換器用偏平チューブに関する。 The present invention relates to a flat tube for a heat exchanger composed of a joint of a pair of aluminum plates.
　下記特許文献１に、従来の熱交換器用偏平チューブの製造方法及びその偏平チューブが記載されている。
　これは図３に示す如く、上下一対のアルミニウムプレート１，２を対向させると共に、その両側を湾曲させ、その湾曲部を重ね合わせて、ラップ部１１を形成する。そして各アルミニウムプレート１，２の幅方向中間部に折返部３を形成し、その頂部３ａに間欠的にスリット１２を形成しておく。そして、アルミニウムプレート１，２の芯材４，５の外面側には通常ろう材６，７が被覆される。ついで、折返部３の頂部３ａにフラックスを塗布し、通常ろう材６，７をスリット１２を介し、折返部３の頂部３ａに導き、アルミニウムプレート１とアルミニウムプレート２とをろう付するものである。
　また、図４は他の従来例であり、この例ではアルミニウムプレート１，２の平面に間欠的にスリット１２を形成し、アルミニウムプレート１，２の外側に被覆された通常ろう材６，７および塗布されたフラックスをそのスリット１２を介し、折返部３の頂部３ａに導くものである。
　さらには、図５は他の従来例であり、この例ではアルミニウムプレート１，２の内面側に通常ろう材６，７を被覆し、アルミニウムプレート１とアルミニウムプレート２との間をろう付するものである。
　図５のろう付においては、一対のプレート１，２どうしを組み合わせ、ろう付部にペースト状のフラックスを塗布、又は組立て後にフラックス層に各プレート１，２をディップしてそれを供給していた。 The following Patent Document 1 describes a conventional method for manufacturing a flat tube for a heat exchanger and the flat tube thereof.
As shown in FIG. 3, a pair of upper and lower aluminum plates 1 and 2 are opposed to each other, both sides thereof are curved, and the curved portions are overlapped to form a lap portion 11. Then, a folded portion 3 is formed in the intermediate portion in the width direction of each of the aluminum plates 1 and 2, and a slit 12 is intermittently formed in the top portion 3a thereof. Then, the outer surface sides of the core materials 4 and 5 of the aluminum plates 1 and 2 are usually coated with the brazing materials 6 and 7. Then, flux is applied to the top 3a of the folded portion 3, and the brazing materials 6 and 7 are usually guided to the top 3a of the folded portion 3 through the slit 12 to braze the aluminum plate 1 and the aluminum plate 2. ..
Further, FIG. 4 is another conventional example. In this example, slits 12 are intermittently formed in the planes of the aluminum plates 1 and 2, and the ordinary brazing materials 6 and 7 and the outer surfaces of the aluminum plates 1 and 2 are covered with the slits 12. The applied flux is guided to the top portion 3a of the folded portion 3 through the slit 12.
Further, FIG. 5 is another conventional example, in which the inner surfaces of the aluminum plates 1 and 2 are coated with the normal brazing materials 6 and 7 and brazed between the aluminum plates 1 and the aluminum plates 2. Is.
In the brazing of FIG. 5, a pair of plates 1 and 2 were combined, and a paste-like flux was applied to the brazed portion, or after assembly, each plate 1 and 2 was dipped into the flux layer and supplied. ..
特開２０１７−０５８０６５号公報Japanese Unexamined Patent Publication No. 2017-058065
　従来の偏平チューブのろう付に際して、図５のように、アルミニウムプレート１，２の内面側に通常ろう材６，７を被覆し、その内面側にフラックスを塗布する場合、フラックス塗布量が多くなり、ろう付後のフラックス残渣が問題となっていた。
　また、図３、図４のように、外面側に通常ろう材６，７を被覆し、そのろう材をスリット１２を介して頂部３ａに供給する場合、スリット１２と頂部３ａとの整合が容易でなく、その不整合によって、ろう付不良が発生する欠点があった。
　そこで、本発明は上記問題点を解決することを課題とする。 When brazing a conventional flat tube, as shown in FIG. 5, when the inner surfaces of the aluminum plates 1 and 2 are coated with the normal brazing materials 6 and 7, and the flux is applied to the inner surface side thereof, the amount of flux applied becomes large. , The flux residue after brazing was a problem.
Further, as shown in FIGS. 3 and 4, when the outer surface side is covered with the normal brazing materials 6 and 7 and the brazing material is supplied to the top portion 3a via the slit 12, the slit 12 and the top portion 3a can be easily aligned. However, there was a drawback that brazing defects occurred due to the inconsistency.
Therefore, it is an object of the present invention to solve the above problems.
　請求項１に記載の本発明は、一対のアルミニウムプレート１，２が夫々幅方向に曲折されて、対向する一対の平面部１ａ，２ａと、
　両平面部１ａ，２ａ間を連結し、対向する一対の側面部１ｂ，２ｂと、
　一方の前記平面部の前記幅方向の中間位置で折り返されて長手方向に伸びる少なくとも一つの折返部３と、を有し、
　前記折返部３の頂部３ａが対向する平面部に当接され、その当接部がろう付される熱交換器用偏平チューブにおいて、
　両方のアルミニウムプレート１，２の芯材４，５の外面には、Ｍｇを含まない通常ろう材６，７が被覆され、
　少なくとも一方のアルミニウムプレート１の芯材４の内面には、Ｍｇを含有するＭｇ含有ろう材８が被覆され、
　そのＭｇ含有量は、０．１~１．０ｗｔ％であり、
　両方のアルミニウムプレート１，２が、それらの内面にフラックスを用いることなく、接合されたことを特徴とする熱交換器用偏平チューブである。
　請求項２に記載の本発明は、請求項１に記載の熱交換器用偏平チューブにおいて、
　両方の前記アルミニウムプレート１，２の芯材４，５の内面に、Ｍｇを含有するＭｇ含有ろう材８，９が被覆され、
　それらのＭｇ含有量は、０．１~０．５ｗｔ％である熱交換器用偏平チューブである。
　請求項３に記載の本発明は、請求項１または請求項２のいずれかに記載の熱交換器用偏平チューブにおいて、
　前記Ｍｇ含有ろう材８，９の少なくとも一方に１~４ｗｔ％のＺｎが含有されている熱交換器用偏平チューブである。 In the present invention according to claim 1, the pair of aluminum plates 1 and 2 are bent in the width direction, respectively, and the pair of flat surface portions 1a and 2a facing each other are formed.
A pair of side surface portions 1b and 2b that connect the two flat surface portions 1a and 2a and face each other,
It has at least one folded portion 3 that is folded back at an intermediate position in the width direction of one of the plane portions and extends in the longitudinal direction.
In a flat tube for heat exchanger, in which the top portion 3a of the folded portion 3 is abutted against a flat surface portion facing the surface and the abutting portion is brazed.
The outer surfaces of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with normal brazing materials 6 and 7 containing no Mg.
The inner surface of the core material 4 of at least one of the aluminum plates 1 is coated with the Mg-containing brazing material 8 containing Mg.
The Mg content is 0.1 to 1.0 wt%, and the Mg content is 0.1 to 1.0 wt%.
Both aluminum plates 1 and 2 are flat tubes for heat exchangers, characterized in that they are joined together without the use of flux on their inner surfaces.
The present invention according to claim 2 is the flat tube for heat exchanger according to claim 1.
The inner surfaces of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with Mg-containing brazing materials 8 and 9 containing Mg.
These are flat tubes for heat exchangers having an Mg content of 0.1 to 0.5 wt%.
The present invention according to claim 3 is the flat tube for heat exchanger according to any one of claims 1 and 2.
A flat tube for a heat exchanger in which at least one of the Mg-containing brazing materials 8 and 9 contains 1 to 4 wt% Zn.
　請求項１に記載の本発明においては、少なくとも一方のアルミニウムプレート１の芯材４の内面に、Ｍｇを含有するＭｇ含有ろう材８が被覆されており、ろう付過程において、そのＭｇが母材表面の酸化被膜を破壊、除去するので、フラックスを用いることなく、折返部３の頂部３ａと対向する平面部２ａとの間を接合することができる。また、従来のようなろう材誘導用のスリットは不要となるので、スリットと平面部との不整合に起因するろう付不良の問題は生じない。
　なお、本発明は内側ろう材のＭｇ含有量を０．１~１．０ｗｔ％としたので、ろう付の際、そのＭｇによって母材表面の酸化被膜が過不足なく除去される。
　請求項２に記載の本発明においては、両方のアルミニウムプレート１，２の芯材４，５の内面に、０．１~０．５ｗｔ％のＭｇを含有するＭｇ含有ろう材８，９が被覆されており、ろう付の際、そのＭｇによって母材表面の酸化被膜が過不足なく除去される。
　請求項３に記載の本発明においては、前記Ｍｇ含有ろう材８，９の少なくとも一方に１~４ｗｔ％のＺｎが含有されているので、上述の効果に加えて、その偏平チューブの内面の耐食性を高めることができる。 In the present invention according to claim 1, the inner surface of the core material 4 of at least one of the aluminum plates 1 is coated with the Mg-containing brazing material 8 containing Mg, and the Mg is used as the base material in the brazing process. Since the oxide film on the surface is destroyed and removed, it is possible to join between the top portion 3a of the folded portion 3 and the flat surface portion 2a facing each other without using flux. Further, since the conventional slit for guiding the brazing material is not required, the problem of brazing failure due to the inconsistency between the slit and the flat surface portion does not occur.
Since the Mg content of the inner brazing material is 0.1 to 1.0 wt% in the present invention, the oxide film on the surface of the base material is removed without excess or deficiency by the Mg during brazing.
In the present invention according to claim 2, the inner surfaces of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with Mg-containing brazing materials 8 and 9 containing 0.1 to 0.5 wt% Mg. At the time of brazing, the oxide film on the surface of the base metal is removed without excess or deficiency by the Mg.
In the present invention according to claim 3, since at least one of the Mg-containing brazing materials 8 and 9 contains 1 to 4 wt% Zn, in addition to the above-mentioned effects, the corrosion resistance of the inner surface of the flat tube thereof. Can be enhanced.
　図１は本発明の熱交換器用偏平チューブであって、ろう付前の状態を示す横断面図（Ａ）及び図１（Ａ）のＢ部拡大図（Ｂ）。
　図２は本発明の第２実施例の熱交換器用偏平チューブであって、ろう付前の状態を示す横断面図（Ａ）及び図２（Ａ）のＢ部拡大図（Ｂ）。
　図３は従来型偏平チューブの横断面図（Ａ）、図３（Ａ）のＢ部拡大図（Ｂ）、その組立て説明図（Ｃ）。
　図４は従来型偏平チューブの他の例の横断面図（Ａ）、図４（Ａ）のＢ部拡大図（Ｂ）、その組立て説明図（Ｃ）。
　図５は従来型偏平チューブの他の例の横断面図（Ａ）、図５（Ａ）のＢ部拡大図（Ｂ）、その組立て説明図（Ｃ）。 FIG. 1 is a flat tube for a heat exchanger of the present invention, and is a cross-sectional view (A) showing a state before brazing and an enlarged view (B) of a portion B of FIG. 1 (A).
FIG. 2 is a flat tube for a heat exchanger according to a second embodiment of the present invention, and is a cross-sectional view (A) showing a state before brazing and an enlarged view (B) of a portion B of FIG. 2 (A).
FIG. 3 is a cross-sectional view (A) of a conventional flat tube, an enlarged view (B) of a portion B of FIG. 3 (A), and an assembly explanatory view (C) thereof.
FIG. 4 is a cross-sectional view (A) of another example of the conventional flat tube, an enlarged view (B) of a portion B of FIG. 4 (A), and an assembly explanatory view (C) thereof.
FIG. 5 is a cross-sectional view (A) of another example of the conventional flat tube, an enlarged view (B) of a portion B of FIG. 5 (A), and an assembly explanatory view (C) thereof.
　次に、図面に基づいて本発明の実施の形態につき説明する。
　図１は、本発明の第１実施例の熱交換器用偏平チューブを示す。図１（Ａ）はその横断面図であり、図１（Ｂ）は図１（Ａ）のＢ部拡大図である。
　図１に記載の熱交換器用偏平チューブは、一対の対向するアルミニウムプレート１とアルミニウムプレート２との嵌着体からなる。
　アルミニウムプレート１の平面部１ａと、アルミニウムプレート２の平面部２ａは対向しており、両プレート１，２は、その夫々幅方向に曲折されて一対の側面部１ｂ，２ｂが形成されており、その側面部１ｂ，２ｂで嵌着されて、両平面部１ａ，２ａ間が連結されている。
　また、少なくとも一方のアルミニウムプレートの平面部には、その幅方向の中間位置が折り返された折返部３を有する。その折返部３は、偏平チューブの長手方向に伸びる。この例では、三つの折返部３が形成され、その頂部３ａが、偏平チューブの対向する平面部の内面側に当接され、その当接部がろう付固定される。
　アルミニウムプレート１の芯材４の外面（偏平チューブの外面側を形成する面）には、Ｍｇを含まない通常ろう材６が被覆され、同様に、アルミニウムプレート２の芯材５の外面（偏平チューブの外面側を形成する面）に、Ｍｇを含まない通常ろう材７が被覆されている。
　アルミニウムプレート１，２の芯材４，５としては、ＪＩＳ　Ａ３００３材等を使用することができる。また、通常ろう材６としては、ＪＩＳ　Ａ４３４３等を用いることができる。
　そして、この第１実施例では、アルミニウムプレート１の芯材４又はアルミニウムプレート２の芯材５のうち、一方のアルミニウムプレートの芯材の内面（偏平チューブの内面を形成する面）にＭｇ含有ろう材８が被覆されている。このＭｇの含有量は０．１~１．０ｗｔ％である。
　ここで、Ｍｇ含有量が０．１％未満では、折返部３の頂部３ａと平面部１ａ，２ａとのろう付性を十分確保できない。また、１．０％を超えると、チューブ内部の雰囲気のＭｇ濃度が過剰となり、ろうの流れが阻害され、ろうが行き渡らなくなるので、ろう付性が低下する。
　また、この偏平チューブの内面を形成する面のＭｇ含有ろう材におけるＳｉ含有量は、ろう付の際の流動性等を適当な範囲に調整する観点から、５~１３ｗｔ％とすることが好ましい。
　この実施例においては、折返部３の数は３つ存在するが、本発明は、折返部３の数に依らず、適用可能であり、特に、複数の折返部３を有する偏平チューブのろう付に好適である。
　このようにしてなる偏平チューブは、その両端部が図示しないヘッダプレートのチューブ挿通孔に挿通され、各偏平チューブ間に図示しないコルゲートフィンが配置される。そして、偏平チューブの外面側にはフラックスが塗布される。しかしながら、偏平チューブの内面側にはフラックスは塗布されない。そして全体を炉内においてろう付し、各部品間が接合されて熱交換器を完成する。
　このとき、アルミニウムプレート１，２の芯材４，５の内面側に被覆されたＭｇ含有ろう材８の適量のＭｇ（０．１~１．０ｗｔ％）により、折返部３の頂部３ａとそれに対向する平面部１ａ，２ａとの間が確実にろう付される。
　なお、他方のアルミニウムプレートの芯材の内面側には、図１に示すように、犠牲材１０を被覆しておくことができる。
　図２は、本発明の第２実施例の熱交換器用偏平チューブを示す。
　この例が、第１実施例と異なる点は、両方のアルミニウムプレート１，２の芯材４，５の内面（偏平チューブの内面を形成する面）にＭｇ含有ろう材８，９が被覆されている点である。このＭｇの含有量は０．１~０．５ｗｔ％である。
　このように構成すると、Ｍｇの総量が適量となり、アルミニウムプレート１とアルミニウムプレート２とが確実にろう付される。
　なお、Ｍｇ含有量が０．５ｗｔ％を超えると、アルミニウムプレート１，２のラップ部１１において、アルミニウムプレート２内面のＭｇと、アルミニウムプレート１の外面に塗布されたフラックスとが反応し、ラップ部１１のろう付性が低下する。
　また、第１実施例又は第２実施例の構成において、Ｍｇ含有ろう材としてさらにＺｎが１~４ｗｔ％含有されたものを用いてもよい。
　このようにすると、偏平チューブの内面の耐食性が高まるので、この偏平チューブを自動車用ラジエータに用いた場合であっても、エンジン冷却水によるチューブの内面の腐食を防止できる。
　なお、それ以外の構造及び作用は、前記第１実施例、第２実施例と同一である。 Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a flat tube for a heat exchanger according to the first embodiment of the present invention. 1 (A) is a cross-sectional view thereof, and FIG. 1 (B) is an enlarged view of a portion B of FIG. 1 (A).
The flat tube for heat exchanger shown in FIG. 1 is composed of a fitting body of a pair of facing aluminum plates 1 and aluminum plates 2.
The flat surface portion 1a of the aluminum plate 1 and the flat surface portion 2a of the aluminum plate 2 face each other, and both the plates 1 and 2 are bent in the width direction to form a pair of side surface portions 1b and 2b. It is fitted by the side surface portions 1b and 2b, and the two flat surface portions 1a and 2a are connected to each other.
Further, the flat surface portion of at least one of the aluminum plates has a folded-back portion 3 whose intermediate position in the width direction is folded back. The folded portion 3 extends in the longitudinal direction of the flat tube. In this example, three folded portions 3 are formed, the top portion 3a thereof is abutted against the inner surface side of the opposite flat surface portion of the flat tube, and the abutting portion is brazed and fixed.
The outer surface of the core material 4 of the aluminum plate 1 (the surface forming the outer surface side of the flat tube) is covered with a normal brazing material 6 containing no Mg, and similarly, the outer surface of the core material 5 of the aluminum plate 2 (flat tube). The surface forming the outer surface side of the surface) is coated with a normal brazing material 7 containing no Mg.
JIS A3003 material or the like can be used as the core materials 4 and 5 of the aluminum plates 1 and 2. Further, as the normal brazing filler metal 6, JIS A4343 or the like can be used.
Then, in this first embodiment, of the core material 4 of the aluminum plate 1 or the core material 5 of the aluminum plate 2, the inner surface of the core material of one of the aluminum plates (the surface forming the inner surface of the flat tube) may contain Mg. The material 8 is covered. The content of this Mg is 0.1 to 1.0 wt%.
Here, if the Mg content is less than 0.1%, the brazing property between the top portion 3a of the folded portion 3 and the flat surface portions 1a and 2a cannot be sufficiently ensured. On the other hand, if it exceeds 1.0%, the Mg concentration in the atmosphere inside the tube becomes excessive, the flow of brazing is obstructed, and the brazing does not spread, so that the brazing property is lowered.
Further, the Si content in the Mg-containing brazing material on the surface forming the inner surface of the flat tube is preferably 5 to 13 wt% from the viewpoint of adjusting the fluidity at the time of brazing to an appropriate range.
In this embodiment, there are three folded portions 3, but the present invention is applicable regardless of the number of folded portions 3, and in particular, brazing of a flat tube having a plurality of folded portions 3. Suitable for.
Both ends of the flat tube thus formed are inserted into tube insertion holes of a header plate (not shown), and corrugated fins (not shown) are arranged between the flat tubes. Then, flux is applied to the outer surface side of the flat tube. However, no flux is applied to the inner surface side of the flat tube. Then, the whole is brazed in the furnace, and the parts are joined to complete the heat exchanger.
At this time, the top portion 3a of the folded-back portion 3 and the top portion 3a of the folded portion 3 are provided with an appropriate amount of Mg (0.1 to 1.0 wt%) of the Mg-containing brazing material 8 coated on the inner surface side of the core materials 4 and 5 of the aluminum plates 1 and 2. It is surely brazed between the facing flat surface portions 1a and 2a.
As shown in FIG. 1, the sacrificial material 10 can be coated on the inner surface side of the core material of the other aluminum plate.
FIG. 2 shows a flat tube for a heat exchanger according to a second embodiment of the present invention.
This example differs from the first embodiment in that the inner surfaces (the surfaces forming the inner surface of the flat tube) of the core materials 4 and 5 of both aluminum plates 1 and 2 are coated with Mg-containing brazing materials 8 and 9. That is the point. The content of this Mg is 0.1 to 0.5 wt%.
With this configuration, the total amount of Mg becomes an appropriate amount, and the aluminum plate 1 and the aluminum plate 2 are surely brazed.
When the Mg content exceeds 0.5 wt%, the Mg on the inner surface of the aluminum plate 2 reacts with the flux applied to the outer surface of the aluminum plate 1 in the wrap portion 11 of the aluminum plates 1 and 2, and the wrap portion The brazing property of 11 is reduced.
Further, in the configuration of the first embodiment or the second embodiment, a material containing 1 to 4 wt% of Zn may be used as the Mg-containing brazing material.
By doing so, the corrosion resistance of the inner surface of the flat tube is enhanced, so that even when the flat tube is used for an automobile radiator, corrosion of the inner surface of the tube due to engine cooling water can be prevented.
The other structures and operations are the same as those in the first and second embodiments.
　１，２　アルミニウムプレート
　１ａ，２ａ　平面部
　１ｂ，２ｂ　側面部
　３　折返部
　３ａ　頂部
　４，５　芯材
　６，７　通常ろう材
　８，９　Ｍｇ含有ろう材
　１０　犠牲材
　１１　ラップ部
　１２　スリット 1,2 Aluminum plate 1a, 2a Flat part 1b, 2b Side part 3 Folded part 3a Top part 4,5 Core material 6,7 Normal brazing material 8,9 Mg-containing brazing material 10 Sacrificial material 11 Wrap part 12 Slit

Claims (3)

  1. 　一対のアルミニウムプレート（１）（２）が夫々幅方向に曲折されて、対向する一対の平面部（１ａ）（２ａ）と、
    　両平面部（１ａ）（２ａ）間を連結し、対向する一対の側面部（１ｂ）（２ｂ）と、
    　一方の前記平面部の前記幅方向の中間位置で折り返されて長手方向に伸びる少なくとも一つの折返部（３）と、を有し、
    　前記折返部（３）の頂部（３ａ）が対向する平面部に当接され、その当接部がろう付される熱交換器用偏平チューブにおいて、
    　両方のアルミニウムプレート（１）（２）の芯材（４）（５）の外面には、Ｍｇを含まない通常ろう材（６）（７）が被覆され、
    　少なくとも一方のアルミニウムプレート（１）の芯材（４）の内面には、Ｍｇを含有するＭｇ含有ろう材（８）が被覆され、
    　そのＭｇ含有量は、０．１~１．０ｗｔ％であり、
    　両方のアルミニウムプレート（１）（２）が、それらの内面にフラックスを用いることなく、接合されたことを特徴とする熱交換器用偏平チューブ。     The pair of aluminum plates (1) and (2) are bent in the width direction, respectively, to form a pair of flat surface portions (1a) and (2a) facing each other.
    A pair of side surface portions (1b) (2b) that connect both plane portions (1a) and (2a) and face each other.
    It has at least one folded portion (3), which is folded back at an intermediate position in the width direction of one of the plane portions and extends in the longitudinal direction.
    In a flat tube for a heat exchanger, in which the top portion (3a) of the folded portion (3) is abutted against a facing flat surface portion and the abutting portion is brazed.
    The outer surfaces of the core materials (4) and (5) of both aluminum plates (1) and (2) are coated with normal brazing materials (6) and (7) containing no Mg.
    The inner surface of the core material (4) of at least one of the aluminum plates (1) is coated with the Mg-containing brazing material (8) containing Mg.
    The Mg content is 0.1 to 1.0 wt%, and the Mg content is 0.1 to 1.0 wt%.
    A flat tube for heat exchangers, characterized in that both aluminum plates (1) and (2) are joined without the use of flux on their inner surfaces.
  2. 　請求項１に記載の熱交換器用偏平チューブにおいて、
    　両方の前記アルミニウムプレート（１）（２）の芯材（４）（５）の内面に、Ｍｇを含有するＭｇ含有ろう材（８）（９）が被覆され、
    　それらのＭｇ含有量は、０．１~０．５ｗｔ％である熱交換器用偏平チューブ。     In the flat tube for heat exchanger according to claim 1.
    The inner surfaces of the core materials (4) and (5) of both aluminum plates (1) and (2) are coated with Mg-containing brazing materials (8) and (9).
    Flat tubes for heat exchangers whose Mg content is 0.1 to 0.5 wt%.
  3. 　請求項１または請求項２のいずれかに記載の熱交換器用偏平チューブにおいて、
    　前記Ｍｇ含有ろう材（８）（９）の少なくとも一方に１~４ｗｔ％のＺｎが含有されている熱交換器用偏平チューブ。     In the flat tube for heat exchanger according to any one of claims 1 or 2.
    A flat tube for a heat exchanger in which 1 to 4 wt% Zn is contained in at least one of the Mg-containing brazing materials (8) and (9).
PCT/JP2021/024050 2020-06-26 2021-06-17 Flat tube for heat exchangers WO2021261574A1 (en)

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Citations (8)

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JP2005037062A (en) * 2003-07-15 2005-02-10 Toyo Radiator Co Ltd Aluminum heat exchanger
US20110204124A1 (en) * 2008-11-10 2011-08-25 Aleris Aluminum Koblenz Gmbh Process for fluxless brazing of aluminium and brazing filler alloy for use therein
JP2013132689A (en) * 2011-12-27 2013-07-08 Mitsubishi Alum Co Ltd Aluminum brazing sheet, brazed structure using the same, and method for manufacturing the aluminum brazing sheet
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
JP2017058065A (en) * 2015-09-16 2017-03-23 株式会社ティラド Method for manufacturing flat tube for heat exchanger and flat tube by the method
JP2018103260A (en) * 2016-12-27 2018-07-05 三菱アルミニウム株式会社 Flux-free soldering blazing sheet, flux-free soldering method and heat exchanger manufacturing method
JP2018196896A (en) * 2017-05-24 2018-12-13 株式会社神戸製鋼所 Aluminum alloy brazing sheet
JP2019155453A (en) * 2018-03-16 2019-09-19 昭和電工株式会社 Fluxless brazing method for aluminum material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005037062A (en) * 2003-07-15 2005-02-10 Toyo Radiator Co Ltd Aluminum heat exchanger
US20110204124A1 (en) * 2008-11-10 2011-08-25 Aleris Aluminum Koblenz Gmbh Process for fluxless brazing of aluminium and brazing filler alloy for use therein
JP2013132689A (en) * 2011-12-27 2013-07-08 Mitsubishi Alum Co Ltd Aluminum brazing sheet, brazed structure using the same, and method for manufacturing the aluminum brazing sheet
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
JP2017058065A (en) * 2015-09-16 2017-03-23 株式会社ティラド Method for manufacturing flat tube for heat exchanger and flat tube by the method
JP2018103260A (en) * 2016-12-27 2018-07-05 三菱アルミニウム株式会社 Flux-free soldering blazing sheet, flux-free soldering method and heat exchanger manufacturing method
JP2018196896A (en) * 2017-05-24 2018-12-13 株式会社神戸製鋼所 Aluminum alloy brazing sheet
JP2019155453A (en) * 2018-03-16 2019-09-19 昭和電工株式会社 Fluxless brazing method for aluminum material

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