JP2009150582A - Flat tube for heat exchanger, heat exchanger, and method for manufacturing flat tube for heat exchanger - Google Patents

Flat tube for heat exchanger, heat exchanger, and method for manufacturing flat tube for heat exchanger Download PDF

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JP2009150582A
JP2009150582A JP2007327532A JP2007327532A JP2009150582A JP 2009150582 A JP2009150582 A JP 2009150582A JP 2007327532 A JP2007327532 A JP 2007327532A JP 2007327532 A JP2007327532 A JP 2007327532A JP 2009150582 A JP2009150582 A JP 2009150582A
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flat
flat tube
flux
tube
flat surfaces
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Atsushi Abei
淳 安部井
Etsuo Hasegawa
恵津夫 長谷川
Yoshiyuki Okamoto
義之 岡本
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Denso Corp
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Denso Corp
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Priority to DE200810062013 priority patent/DE102008062013A1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • 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
    • F28D1/04—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 tubular conduits
    • F28D1/053—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 tubular conduits the conduits being straight
    • F28D1/0535—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 tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
    • F28D2021/0085—Evaporators

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

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manufacturing costs while securing corrosion resistance. <P>SOLUTION: This flat tube 10 for the heat exchanger obtained by forming flux coating layers 10g, 10h including zinc on outer faces of a flat tube 10, includes flat faces 10a, 10b at front and back both sides opposite to each other, and side face portions 10c, 10d connecting both end portions in the width direction of both the flat faces 10a, 10b, a thickness t1 of both the side face portions 10c, 10d is thicker than a thickness t2 of both the flat faces 10a, 10b, and the flux coating layers 10g, 10h including zinc are formed only outer faces of both flat faces 10a, 10b, thus corrosion resistance is secured by thick thickness t2 at both side face portions 10c, 10d, the coating of the flux to both side face portions 10c, 10d becomes unnecessary, and the manufacturing costs is reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、熱交換器用偏平チューブ、熱交換器および熱交換器用偏平チューブの製造方法に関し、車両用空調装置の蒸発器に用いて好適である。   The present invention relates to a heat exchanger flat tube, a heat exchanger, and a method for manufacturing a heat exchanger flat tube, and is suitable for use in an evaporator of a vehicle air conditioner.

従来、熱交換器においては、耐食性向上のために、チューブの外面全体に犠牲腐食効果を発揮する亜鉛層を形成することが有効な手段として知られている（例えば、特許文献１参照）。   Conventionally, in heat exchangers, in order to improve corrosion resistance, it is known as an effective means to form a zinc layer that exhibits a sacrificial corrosion effect on the entire outer surface of the tube (see, for example, Patent Document 1).

この従来技術では、相対向する表裏両側の平坦面と、この両平坦面の幅方向における両端部同士を結合する側面部とを有する偏平チューブをアルミニウム材料の押出成形により一体成形し、この偏平チューブの外面全体に亜鉛を含むフラックスを塗布することによって、偏平チューブの外面全体に亜鉛を含むフラックス塗布層を形成し、さらに、このフラックス塗布層が形成された偏平チューブをフィン等の熱交換器部品と一体ろう付けすることでフラックス塗布層に含まれる亜鉛を偏平チューブの外面全体に拡散させることによって、偏平チューブの外面全体に亜鉛層（亜鉛拡散層）を形成している。   In this prior art, a flat tube having a flat surface on both sides facing each other and a side surface portion connecting both ends in the width direction of both flat surfaces is integrally formed by extrusion molding of an aluminum material, and this flat tube A flux coating layer containing zinc is formed on the entire outer surface of the flat tube by applying a flux containing zinc on the entire outer surface of the flat tube, and the flat tube on which the flux coating layer is formed is used as a heat exchanger component such as a fin. The zinc layer (zinc diffusion layer) is formed on the entire outer surface of the flat tube by diffusing zinc contained in the flux coating layer over the entire outer surface of the flat tube by brazing together.

また、従来、この種の偏平チューブに対するフラックスの塗布方法として、両平坦面に対してフラックスをロールコート法により塗布し（ロールコート工程）、ロールコートによる塗布が困難な両側面部に対してフラックスをスプレー塗布する（スプレー工程）というように、フラックス塗布工程をロールコート工程とスプレー工程の２つの工程に分けて行う方法が実施されている。   Conventionally, as a method of applying flux to this type of flat tube, flux is applied to both flat surfaces by a roll coating method (roll coating process), and flux is applied to both side portions that are difficult to apply by roll coating. As in the case of spray coating (spraying process), a method of performing the flux coating process in two steps, that is, a roll coating process and a spraying process, is performed.

一方、特許文献２には、車両用空調装置の凝縮器（コンデンサ）に用いられる偏平チューブにおいて、チッピング（走行時の飛び石）に対する耐性を向上させるために、側面部の肉厚を平坦面の肉厚よりも厚くすることが提案されている。なお、特許文献２では、偏平チューブを押出成形により一体成形しているが、偏平チューブの外面に亜鉛層を形成していない。
特開２００５−６６６３０号公報 特開２００７−９３１４４号公報 On the other hand, in Patent Document 2, in a flat tube used for a condenser (condenser) of a vehicle air conditioner, in order to improve resistance to chipping (stepping stones during running), the thickness of the side surface portion is set to a flat surface thickness. It has been proposed to be thicker than thick. In Patent Document 2, the flat tube is integrally formed by extrusion, but a zinc layer is not formed on the outer surface of the flat tube.
JP 2005-66630 A JP 2007-93144 A

しかしながら、上記した従来のフラックス塗布方法、即ち、両平坦面に対してロールコート法によりフラックスを塗布し、両側面部に対してフラックスをスプレー塗布する方法では、フラックス塗布工程をロールコート工程とスプレー工程の２つの工程に分けて行うので、製造コストの上昇を招いてしまう。   However, in the above-described conventional flux coating method, that is, a method in which the flux is applied to both flat surfaces by the roll coating method and the flux is spray coated to both side portions, the flux coating process is divided into a roll coating process and a spray process. Therefore, the manufacturing cost is increased.

一方、上記特許文献２は、偏平チューブの外面に亜鉛層を形成していないので、偏平チューブの耐食性が不十分である。   On the other hand, since the said patent document 2 does not form the zinc layer in the outer surface of a flat tube, the corrosion resistance of a flat tube is inadequate.

本発明は、上記点に鑑み、耐食性を確保しつつ、製造コストの低減を図ることを目的とする。   An object of this invention is to aim at reduction of manufacturing cost in view of the said point, ensuring corrosion resistance.

上記目的を達成するため、請求項１に記載の発明では、偏平チューブ（１０）の外面に亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）を形成してなる熱交換器用偏平チューブであって、
偏平チューブ（１０）は、相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有し、
両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）が両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、両平坦面（１０ａ、１０ｂ）の外面のみに形成されていることを特徴とする。 In order to achieve the above object, the invention according to claim 1 is a flat tube for a heat exchanger in which a flux coating layer (10 g, 10 h) containing zinc is formed on the outer surface of the flat tube (10),
The flat tube (10) has flat surfaces (10a, 10b) on both sides facing each other and side portions (10c, 10d) that join both ends in the width direction of both flat surfaces (10a, 10b). And
The wall thickness (t1) of both side surfaces (10c, 10d) is thicker than the wall thickness (t2) of both flat surfaces (10a, 10b),
A flux coating layer (10 g, 10 h) containing zinc is formed only on the outer surfaces of both flat surfaces (10 a, 10 b).

これによると、両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）を両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くしているので、両側面部（１０ｃ、１０ｄ）では、その厚い肉厚（ｔ２）によって耐食性を確保できる。   According to this, since the thickness (t1) of both side surface portions (10c, 10d) is thicker than the thickness (t2) of both flat surfaces (10a, 10b), the both side surface portions (10c, 10d) Corrosion resistance can be ensured by the thick wall thickness (t2).

そして、亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）を両平坦面（１０ａ、１０ｂ）の外面のみに形成しているので、両側面部（１０ｃ、１０ｄ）に対するフラックスの塗布が不要となり、製造コストを低減することができる。   And since the flux coating layer (10g, 10h) containing zinc is formed only on the outer surfaces of both flat surfaces (10a, 10b), it is not necessary to apply flux to both side surfaces (10c, 10d), and the manufacturing cost is reduced. Can be reduced.

なお、請求項１の発明における「亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、両平坦面（１０ａ、１０ｂ）の外面のみに形成されている」とは、亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、厳密に両平坦面（１０ａ、１０ｂ）の外面のみに形成されていることのみを意味するものではなく、亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、製造上の誤差等により、両平坦面（１０ａ、１０ｂ）の外面以外の部位にも僅かに形成されていることをも含む意味のものである。   In addition, in the invention of claim 1, “the flux coating layer containing zinc (10 g, 10 h) is formed only on the outer surfaces of both flat surfaces (10 a, 10 b)” means that the flux coating layer containing zinc (10 g 10h) does not mean that it is strictly formed only on the outer surfaces of both flat surfaces (10a, 10b), and the flux coating layer (10g, 10h) containing zinc has manufacturing errors, etc. Thus, it is meant to include that the flat surfaces (10a, 10b) are slightly formed on the portions other than the outer surfaces.

請求項２に記載の発明では、請求項１に記載の熱交換器用偏平チューブにおいて、
偏平チューブ（１０）は、両平坦面（１０ａ、１０ｂ）のうち幅方向における中間部同士を連結する内柱（１０ｅ）を有し、
内柱（１０ｅ）は、前記幅方向に複数個配置され、
偏平チューブ（１０）は、両平坦面（１０ａ、１０ｂ）、両側面部（１０ｃ、１０ｄ）および複数個の内柱（１０ｅ）が押出成形により一体成形されており、
複数個の内柱（１０ｅ）の肉厚（ｔ３）は、両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）よりも薄く、かつ前記幅方向の中央側に位置する内柱から前記幅方向の両端側に位置する内柱に向かうにつれて厚くなっていることを特徴とする。 In invention of Claim 2, in the flat tube for heat exchangers of Claim 1,
The flat tube (10) has an inner column (10e) that connects intermediate portions in the width direction of both flat surfaces (10a, 10b),
A plurality of inner pillars (10e) are arranged in the width direction,
The flat tube (10) has both flat surfaces (10a, 10b), both side surfaces (10c, 10d) and a plurality of inner pillars (10e) integrally formed by extrusion,
The thickness (t3) of the plurality of inner pillars (10e) is thinner than the thickness (t1) of the side surface portions (10c, 10d) and from the inner pillar located on the center side in the width direction to the width direction. It is characterized by becoming thicker toward the inner pillar located at both ends.

これによると、偏平チューブ（１０）を押出成形する際に、押出圧を前記幅方向の中央側から前記幅方向の両端側に向かうにつれて徐々に高くすることができるので、両側面部（１０ｃ、１０ｄ）にて押出圧が急変してしまうことを防止でき、ひいては押出型の型寿命を長くすることができる。   According to this, when extruding the flat tube (10), the extrusion pressure can be gradually increased from the central side in the width direction toward both end sides in the width direction. ), The extrusion pressure can be prevented from changing suddenly, and the die life of the extrusion die can be extended.

請求項３に記載の発明では、偏平チューブ（１０）の外面に亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）を形成してなる熱交換器用偏平チューブであって、
偏平チューブ（１０）は、相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有し、
両側面部（１０ｃ、１０ｄ）のうち一方の側面部の肉厚（ｔ１）が両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、両平坦面（１０ａ、１０ｂ）の外面および両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面のみに形成されていることを特徴とする。 In invention of Claim 3, it is the flat tube for heat exchangers which forms the flux application layer (10g, 10h) containing zinc in the outer surface of the flat tube (10),
The flat tube (10) has flat surfaces (10a, 10b) on both sides facing each other and side portions (10c, 10d) that join both ends in the width direction of both flat surfaces (10a, 10b). And
The thickness (t1) of one side surface portion of both side surface portions (10c, 10d) is thicker than the thickness (t2) of both flat surfaces (10a, 10b),
The flux coating layer (10g, 10h) containing zinc is formed only on the outer surface of the two flat surfaces (10a, 10b) and the outer surface of the other side surface portion of the both side surface portions (10c, 10d). .

これによると、両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）を両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くしているので、両側面部（１０ｃ、１０ｄ）では、その厚い肉厚（ｔ２）によって耐食性を確保できる。   According to this, since the thickness (t1) of both side surface portions (10c, 10d) is thicker than the thickness (t2) of both flat surfaces (10a, 10b), the both side surface portions (10c, 10d) Corrosion resistance can be ensured by the thick wall thickness (t2).

そして、亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）を両平坦面（１０ａ、１０ｂ）の外面および両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面のみに形成しているので、一方の側面部に対するフラックスの塗布が不要となり、製造コストを低減することができる。   And since the flux application layer (10g, 10h) containing zinc is formed only on the outer surface of the other side surface portion among the outer surface of both flat surfaces (10a, 10b) and both side surface portions (10c, 10d), It is not necessary to apply flux to the side surfaces, and the manufacturing cost can be reduced.

なお、請求項３の発明における「亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、両平坦面（１０ａ、１０ｂ）の外面および両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面のみに形成されている」とは、亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、厳密に両平坦面（１０ａ、１０ｂ）の外面および前記他方の側面部の外面のみに形成されていることのみを意味するものではなく、亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）が、製造上の誤差等により、両平坦面（１０ａ、１０ｂ）の外面および前記他方の側面部の外面以外の部位にも僅かに形成されていることをも含む意味のものである。   In the invention of claim 3, “the flux coating layer containing zinc (10g, 10h) is only on the outer surface of both flat surfaces (10a, 10b) and the outer surface of the other side surface portion of both side surface portions (10c, 10d). “It is formed” only means that the flux coating layer (10 g, 10 h) containing zinc is formed only on the outer surface of both flat surfaces (10 a, 10 b) and only the outer surface of the other side surface portion. It does not mean that the flux coating layer (10 g, 10 h) containing zinc is slightly present on the outer surfaces of the two flat surfaces (10 a, 10 b) and the outer surface of the other side surface part due to manufacturing errors or the like. It is also meant to include being formed.

請求項４に記載の発明では、請求項１に記載の熱交換器用偏平チューブにおいて、
偏平チューブ（１０）は、両平坦面（１０ａ、１０ｂ）のうち幅方向における中間部同士を連結する内柱（１０ｅ）を有し、
内柱（１０ｅ）は、前記幅方向に複数個配置され、
偏平チューブ（１０）は、両平坦面（１０ａ、１０ｂ）、両側面部（１０ｃ、１０ｄ）および複数個の内柱（１０ｅ）が押出成形により一体成形されており、
複数個の内柱（１０ｅ）の肉厚（ｔ３）は、一方の側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）よりも薄く、かつ前記他方の側面部側に位置する内柱から前記一方の側面部側に位置する内柱に向かうにつれて厚くなっていることを特徴とする。 In invention of Claim 4, in the flat tube for heat exchangers of Claim 1,
The flat tube (10) has an inner column (10e) that connects intermediate portions in the width direction of both flat surfaces (10a, 10b),
A plurality of inner pillars (10e) are arranged in the width direction,
The flat tube (10) has both flat surfaces (10a, 10b), both side surfaces (10c, 10d) and a plurality of inner pillars (10e) integrally formed by extrusion,
The thickness (t3) of the plurality of inner pillars (10e) is thinner than the thickness (t1) of one side face part (10c, 10d), and the one from the inner pillar located on the other side face part side. It is characterized by becoming thicker as it goes to the inner pillar located on the side surface side.

これによると、偏平チューブ（１０）を押出成形する際に、押出圧を前記他方の側面部側から前記一方の側面部側に向かうにつれて徐々に高くすることができるので、前記一方の側面部にて押出圧が急変してしまうことを防止でき、ひいては押出型の型寿命を長くすることができる。   According to this, when extruding the flat tube (10), the extrusion pressure can be gradually increased from the other side surface side toward the one side surface side. Thus, it is possible to prevent the extrusion pressure from changing suddenly, thereby extending the mold life of the extrusion mold.

請求項５に記載の発明では、請求項１または３に記載の熱交換器用偏平チューブにおいて、前記偏平チューブ（１０）は、両平坦面（１０ａ、１０ｂ）のうち前記幅方向における中間部同士を連結する内柱（１０ｅ）を有し、
内柱（１０ｅ）は、前記幅方向に複数個配置され、
偏平チューブ（１０）は、両平坦面（１０ａ、１０ｂ）、両側面部（１０ｃ、１０ｄ）および複数個の内柱（１０ｅ）が押出成形により一体成形されており、
複数個の内柱（１０ｅ）の肉厚（ｔ３）は、両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）よりも薄く、かつ互いに同一になっていることを特徴とする。 According to a fifth aspect of the present invention, in the flat tube for a heat exchanger according to the first or third aspect, the flat tube (10) has an intermediate portion in the width direction of both flat surfaces (10a, 10b). It has an inner pillar (10e) to be connected,
A plurality of inner pillars (10e) are arranged in the width direction,
The flat tube (10) has both flat surfaces (10a, 10b), both side surfaces (10c, 10d) and a plurality of inner pillars (10e) integrally formed by extrusion,
The thickness (t3) of the plurality of inner pillars (10e) is smaller than the thickness (t1) of the side surface portions (10c, 10d) and is the same as each other.

請求項６に記載の発明では、相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有する偏平チューブ（１０）を備え、
両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）が両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
両平坦面（１０ａ、１０ｂ）の外面のみに亜鉛層が形成されていることを特徴とする。 In the invention according to claim 6, the flat surfaces (10a, 10b) on both sides facing each other, and the side surface portions (10c, 10d) for joining both ends in the width direction of the both flat surfaces (10a, 10b), A flat tube (10) having
The wall thickness (t1) of both side surfaces (10c, 10d) is thicker than the wall thickness (t2) of both flat surfaces (10a, 10b),
A zinc layer is formed only on the outer surfaces of both flat surfaces (10a, 10b).

これによると、上記した請求項１の発明と同様の理由により、耐食性を確保しつつ、製造コストを低減できる。   According to this, for the same reason as that of the first aspect of the invention, the manufacturing cost can be reduced while ensuring the corrosion resistance.

なお、請求項６の発明における「両平坦面（１０ａ、１０ｂ）の外面のみに亜鉛層が形成されている」とは、厳密に両平坦面（１０ａ、１０ｂ）の外面のみに亜鉛層が形成されていることのみを意味するものではなく、製造上の誤差等により、両平坦面（１０ａ、１０ｂ）の外面以外の部位にも僅かに亜鉛層が形成されていることをも含む意味のものである。   In the invention of claim 6, “the zinc layer is formed only on the outer surfaces of both flat surfaces (10a, 10b)” strictly means that the zinc layer is formed only on the outer surfaces of both flat surfaces (10a, 10b). It does not only mean that it is made, but also means that a slight zinc layer is formed on the portions other than the outer surfaces of both flat surfaces (10a, 10b) due to manufacturing errors, etc. It is.

請求項７に記載の発明では、相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有する偏平チューブ（１０）を備え、
両側面部（１０ｃ、１０ｄ）のうち一方の側面部の肉厚（ｔ１）が両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
両平坦面（１０ａ、１０ｂ）の外面および両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面のみに亜鉛層が形成されていることを特徴とする。 In the invention according to claim 7, the flat surfaces (10a, 10b) on both sides facing each other, and the side surfaces (10c, 10d) for joining both ends in the width direction of both flat surfaces (10a, 10b), A flat tube (10) having
The thickness (t1) of one side surface portion of both side surface portions (10c, 10d) is thicker than the thickness (t2) of both flat surfaces (10a, 10b),
A zinc layer is formed only on the outer surface of the other side surface portion among the outer surfaces of both flat surfaces (10a, 10b) and both side surface portions (10c, 10d).

これによると、上記した請求項３の発明と同様の理由により、耐食性を確保しつつ、製造コストを低減できる。   According to this, for the same reason as the above invention of claim 3, it is possible to reduce the manufacturing cost while ensuring the corrosion resistance.

なお、請求項７の発明における「両平坦面（１０ａ、１０ｂ）の外面および両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面のみに亜鉛層が形成されている」とは、厳密に両平坦面（１０ａ、１０ｂ）の外面および前記他方の側面部の外面のみに亜鉛層が形成されていることのみを意味するものではなく、製造上の誤差等により、両平坦面（１０ａ、１０ｂ）の外面および両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面以外の部位にも僅かに亜鉛層が形成されていることをも含む意味のものである。   In addition, in the invention of claim 7, “the zinc layer is formed only on the outer surface of both flat surfaces (10a, 10b) and the outer surface of the other side surface portion of both side surface portions (10c, 10d)” is strictly This does not mean that the zinc layer is formed only on the outer surfaces of the two flat surfaces (10a, 10b) and the outer surface of the other side surface portion. ) Of the outer surface and both side surface portions (10c, 10d) of the other side surface portion other than the outer surface of the other side surface portion is meant to include a slight zinc layer.

請求項８に記載の発明では、請求項１に記載の熱交換器用偏平チューブを製造する熱交換器用偏平チューブの製造方法であって、
偏平チューブ（１０）を押出成形する押出工程と、
押出工程の後に行われ、偏平チューブ（１０）の外面に亜鉛を含むフラックスを塗布するフラックス塗布工程とを備え、
フラックス塗布工程は、両平坦面（１０ａ、１０ｂ）の外面にフラックスをロールコート法により塗布するロールコート工程のみからなることを特徴とする。 In invention of Claim 8, it is a manufacturing method of the flat tube for heat exchangers which manufactures the flat tube for heat exchangers of Claim 1,
An extrusion process of extruding the flat tube (10);
A flux application step that is performed after the extrusion step and that applies a flux containing zinc to the outer surface of the flat tube (10),
The flux coating process is characterized by only comprising a roll coating process in which flux is applied to the outer surfaces of both flat surfaces (10a, 10b) by a roll coating method.

これにより、上記した従来のフラックス塗布方法に対してスプレー工程を廃止できるので、請求項１に記載の熱交換器用偏平チューブを低コストで製造できる。   Thereby, since a spray process can be abolished with respect to the above-mentioned conventional flux application method, the flat tube for heat exchangers according to claim 1 can be manufactured at low cost.

請求項９に記載の発明では、請求項３に記載の熱交換器用偏平チューブを製造する熱交換器用偏平チューブの製造方法であって、
偏平チューブ（１０）を押出成形する押出工程と、
押出工程の後に行われ、偏平チューブ（１０）の外面に亜鉛を含むフラックスを塗布するフラックス塗布工程とを備え、
フラックス塗布工程は、両平坦面（１０ａ、１０ｂ）の外面に亜鉛を含むフラックスをロールコート法により塗布するロールコート工程、および前記他方の側面部の外面のみにフラックスをスプレー塗布するスプレー工程のみからなることを特徴とする。 In invention of Claim 9, it is a manufacturing method of the flat tube for heat exchangers which manufactures the flat tube for heat exchangers of Claim 3,
An extrusion process of extruding the flat tube (10);
A flux application step that is performed after the extrusion step and that applies a flux containing zinc to the outer surface of the flat tube (10),
The flux application process includes only a roll coating process in which a flux containing zinc is applied to the outer surfaces of both flat surfaces (10a, 10b) by a roll coating method, and a spray process in which the flux is spray applied only to the outer surface of the other side surface portion. It is characterized by becoming.

これにより、上記した従来のフラックス塗布方法に対して、前記一方の側面部にフラックスをスプレー塗布することを廃止できるので、請求項３に記載の熱交換器用偏平チューブを低コストで製造できる。   Thereby, since it can abolish spraying a flux on said one side part with respect to the above-mentioned conventional flux application | coating method, the flat tube for heat exchangers of Claim 3 can be manufactured at low cost.

なお、請求項９の発明における「前記他方の側面部の外面のみに亜鉛を含むフラックスをスプレー塗布する」とは、厳密に前記他方の側面部の外面のみに亜鉛を含むフラックスをスプレー塗布することのみを意味するものではなく、製造上の誤差等により、前記他方の側面部の外面以外の部位にも僅かに亜鉛を含むフラックスがスプレー塗布されることをも含む意味のものである。   In addition, in the invention of claim 9, “spraying a flux containing zinc only on the outer surface of the other side surface portion” means strictly applying a flux containing zinc only on the outer surface of the other side surface portion. It means not only that, but also that a flux slightly containing zinc is spray-applied to a portion other than the outer surface of the other side surface portion due to a manufacturing error or the like.

なお、この欄および特許請求の範囲で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。   In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

（第１実施形態）
以下、本発明の第１実施形態について図１〜図４に基づいて説明する。図１は本実施形態によるフラックス塗布方法の概要を示すものである。なお、図１中の破線は、上記した従来のフラックス塗布方法におけるスプレー工程を示している。 (First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an outline of the flux coating method according to the present embodiment. In addition, the broken line in FIG. 1 has shown the spray process in the above-mentioned conventional flux application | coating method.

偏平チューブ１０は、アルミニウム材料を押出成形して、図２に示すような多穴偏平断面形状に一体成形される。なお、本明細書においてアルミニウムという用語はアルミニウム合金を含む意味で用いている。   The flat tube 10 is integrally formed into a multi-hole flat cross-sectional shape as shown in FIG. 2 by extruding an aluminum material. In the present specification, the term aluminum is used to include an aluminum alloy.

偏平チューブ１０の偏平断面形状は、より具体的には、相対向する表裏両側の平坦面１０ａ、１０ｂと、この両平坦面１０ａ、１０ｂの幅方向の左右両側を結合する側面部１０ｃ、１０ｄと、両平坦面１０ａ、１０ｂのうち幅方向（図２の左右方向）における中間部同士を連結する内柱１０ｅとから構成されている。   More specifically, the flat cross-sectional shape of the flat tube 10 includes: flat surfaces 10a and 10b on opposite front and back sides; and side portions 10c and 10d that connect the left and right sides in the width direction of the flat surfaces 10a and 10b. The inner pillar 10e which connects the intermediate parts in the width direction (left-right direction of FIG. 2) among both the flat surfaces 10a and 10b is comprised.

内柱１０ｅは、チューブ幅方向（両平坦面１０ａ、１０ｂの幅方向）に複数個配置されている。したがって、偏平チューブ１０内には、チューブ長手方向に貫通する多数の貫通穴１０ｆがチューブ幅方向に並列に設けられている。   A plurality of inner pillars 10e are arranged in the tube width direction (the width direction of both flat surfaces 10a and 10b). Therefore, in the flat tube 10, a large number of through holes 10f penetrating in the tube longitudinal direction are provided in parallel in the tube width direction.

図２に示すように、両側面部１０ｃ、１０ｄの肉厚ｔ１は、両平坦面１０ａ、１０ｂの肉厚ｔ２よりも厚くなっている。本例では、複数個の内柱１０ｅの肉厚ｔ３が両側面部１０ｃ、１０ｄの肉厚ｔ１よりも薄く、かつ互いに同一になっている。   As shown in FIG. 2, the thickness t1 of both side surface portions 10c, 10d is thicker than the thickness t2 of both flat surfaces 10a, 10b. In this example, the thickness t3 of the plurality of inner pillars 10e is thinner than the thickness t1 of the side surface portions 10c, 10d and is the same as each other.

図２の具体例では、側面部１０ｃ、１０ｄは断面三角状の尖った形状になっているが、形状側面部１０ｃ、１０ｄの断面形状を円弧状のような滑らかな曲面形状にしてもよいことはもちろんである。なお、図２において、符号１０ｇ、１０ｈは、偏平チューブ１０の両平坦面１０ａ、１０ｂの外面に後述の塗布方法にて形成されたフラックス塗布層である。   In the specific example of FIG. 2, the side surface portions 10c and 10d have a sharp shape with a triangular cross section, but the cross sectional shape of the shape side surface portions 10c and 10d may be a smooth curved surface shape such as an arc shape. Of course. In FIG. 2, reference numerals 10 g and 10 h are flux application layers formed on the outer surfaces of both flat surfaces 10 a and 10 b of the flat tube 10 by a coating method described later.

アルミニウム材料の押出成形により成形された偏平チューブ１０は巻き戻し機２０にコイル状に巻回されており、このコイル状の外周端部を巻き戻し機２０から巻き戻すようになっている。この巻き戻しされた偏平チューブ１０がフラックス塗布装置２１に送られる。   A flat tube 10 formed by extrusion molding of an aluminum material is wound around a rewinding machine 20 in a coil shape, and this coiled outer peripheral end is rewound from the rewinding machine 20. The unwound flat tube 10 is sent to the flux application device 21.

フラックス塗布装置２１には上部が開口した形状の塗布液収容タンク（図示せず）が備えられている。この塗布液収容タンクの内部には亜鉛を含むフラックスの塗布液が収容されている。ここで、亜鉛を含むフラックスは、具体的には亜鉛置換フラックスであるＫＺｎＦ３を用いている。そして、塗布液ＡはこのＫＺｎＦ３をバインダーとともに溶剤中に溶かし込んだものである。   The flux coating device 21 is provided with a coating liquid storage tank (not shown) having an opening at the top. Inside the coating solution storage tank, a flux coating solution containing zinc is stored. Here, as the flux containing zinc, specifically, KZnF3, which is a zinc substitution flux, is used. And the coating liquid A melt | dissolves this KZnF3 in the solvent with the binder.

なお、バインダーはフラックス成分を偏平チューブ１０のアルミニウム表面に付着させるためのもので、具体的にはアクリル系樹脂である。また、溶剤は塗布しやすい所定粘度を持つ溶液を作るためのもので、具体的にはブタノール系溶剤、エタノール系溶剤等を使用する。   The binder is for attaching a flux component to the aluminum surface of the flat tube 10, and is specifically an acrylic resin. The solvent is used to make a solution having a predetermined viscosity that can be easily applied. Specifically, a butanol solvent, an ethanol solvent, or the like is used.

塗布液収容タンクの上部開口部に塗布液引き上げロール２２をその下部が塗布液中に浸漬するように配置してある。このロール２２が回転して、ロール２２の外周面上に塗布液を引き上げる。   A coating liquid pulling roll 22 is arranged in the upper opening of the coating liquid storage tank so that the lower part is immersed in the coating liquid. The roll 22 rotates to pull up the coating solution on the outer peripheral surface of the roll 22.

そして、ロール２２の隣接位置に、ロール２２の外周面と偏平チューブ１０の一方の平坦面１０ａの両方に圧接するように塗布液付着ロール２３が配置されている。この塗布液付着ロール２３をロール２２と逆方向に回転することにより、ロール２２の外周面上の塗布液をロール２３の外周面上に移動させる。   A coating liquid adhesion roll 23 is disposed at a position adjacent to the roll 22 so as to be in pressure contact with both the outer peripheral surface of the roll 22 and one flat surface 10 a of the flat tube 10. By rotating the coating liquid adhesion roll 23 in the direction opposite to the roll 22, the coating liquid on the outer peripheral surface of the roll 22 is moved onto the outer peripheral surface of the roll 23.

これら塗布液収容タンクおよびロール２２、２３は、偏平チューブ１０の両平坦面１０ａ、１０ｂ側に配置されている。したがって、ロール２３の外周面上の塗布液は偏平チューブ１０の両平坦面１０ａ、１０ｂ側に移動して両平坦面１０ａ、１０ｂに塗布される。   These coating solution storage tanks and rolls 22 and 23 are arranged on both flat surfaces 10 a and 10 b of the flat tube 10. Accordingly, the coating liquid on the outer peripheral surface of the roll 23 moves to the flat surfaces 10a and 10b side of the flat tube 10 and is applied to the flat surfaces 10a and 10b.

フラックス塗布装置２１を通過した偏平チューブ１０は、乾燥炉２４内に搬入されるようになっている。この乾燥炉２４は乾燥ゾーン２４ａと冷却ゾーン２４ｂとから構成される。   The flat tube 10 that has passed through the flux applying device 21 is carried into the drying furnace 24. The drying furnace 24 includes a drying zone 24a and a cooling zone 24b.

乾燥炉２４を通過した偏平チューブ１０は巻き取り機２５の方向に移動し、この巻き取り機２５に偏平チューブ１０がコイル状に巻き取られるようになっている。   The flat tube 10 that has passed through the drying furnace 24 moves in the direction of the winder 25, and the flat tube 10 is wound around the winder 25 in a coil shape.

次に、本実施形態による熱交換器用偏平チューブの製造方法を説明する。まず、アルミニウム材料を押出成形して、多穴偏平断面形状の偏平チューブ１０を成形する（押出工程）。押出工程により成形された偏平チューブ１０は巻き戻し機２０にコイル状に巻回される。   Next, the manufacturing method of the flat tube for heat exchangers by this embodiment is demonstrated. First, an aluminum material is extruded to form the flat tube 10 having a flat shape with a multi-hole flat section (extrusion process). The flat tube 10 formed by the extrusion process is wound around the rewinder 20 in a coil shape.

次に、図１に示すように、偏平チューブ１０は巻き戻し機２０から巻き戻され、矢印Ａ方向に移動して巻き取り機２５に巻き取られる。巻き戻し機２０と巻き取り機２５との間に位置するフラックス塗布装置２１では、ロールコート法により偏平チューブ１０の両平坦面１０ａ、１０ｂに対するフラックス塗布を行う（ロールコート工程）。   Next, as shown in FIG. 1, the flat tube 10 is unwound from the rewinding machine 20, moves in the arrow A direction, and is wound on the winding machine 25. In the flux application device 21 located between the unwinder 20 and the winder 25, the flux is applied to the flat surfaces 10a and 10b of the flat tube 10 by a roll coating method (roll coating step).

フラックス塗布装置２１によるロールコート工程を終了した偏平チューブ１０は、次に乾燥炉２４の乾燥ゾーン２４ａ内に搬入される。この乾燥ゾーン２４ａでは、偏平チューブ１０を２００℃〜３００℃程度の温度に加熱して、塗布液中の溶剤成分を蒸発させる（乾燥工程）。これにより、両平坦面１０ａ、１０ｂの外面にフラックス成分とバインダーの樹脂成分による被膜が形成される。なお、乾燥ゾーン２４ａは具体的には熱風による対流加熱方式が好適である。   The flat tube 10 that has finished the roll coating process by the flux applying device 21 is then carried into the drying zone 24 a of the drying furnace 24. In the drying zone 24a, the flat tube 10 is heated to a temperature of about 200 ° C. to 300 ° C. to evaporate the solvent component in the coating solution (drying process). Thereby, the film by the flux component and the resin component of a binder is formed in the outer surface of both the flat surfaces 10a and 10b. Specifically, the drying zone 24a is preferably a convection heating method using hot air.

偏平チューブ１０は、乾燥ゾーン２４ａを通過後、冷却ゾーン２４ｂ内に搬入される。この冷却ゾーン２４ｂでは、乾燥ゾーン２４ａを通過した偏平チューブ１０を冷却して偏平チューブ１０の温度を常温付近まで低下させる。   The flat tube 10 is carried into the cooling zone 24b after passing through the drying zone 24a. In the cooling zone 24b, the flat tube 10 that has passed through the drying zone 24a is cooled to lower the temperature of the flat tube 10 to near room temperature.

乾燥炉２４を通過した偏平チューブ１０は巻き取り機２５の方向に移動し、この巻き取り機２５に偏平チューブ１０がコイル状に巻き取られる。コイル状に巻き取られた偏平チューブ１０は、その後、所定長さに切断される。なお、乾燥炉２４を通過した偏平チューブ１０をコイル状に巻き取ることなく所定長さに切断してもよい。   The flat tube 10 that has passed through the drying furnace 24 moves in the direction of the winder 25, and the flat tube 10 is wound around the winder 25 in a coil shape. The flat tube 10 wound in a coil shape is then cut into a predetermined length. In addition, you may cut | disconnect the flat tube 10 which passed the drying furnace 24 to predetermined length, without winding up in coil shape.

以上により、偏平チューブ１０の両平坦面１０ａ、１０ｂに対するフラックス塗布を完了でき、図２に示すフラックス塗布層１０ｇ、１０ｈが形成された熱交換器用偏平チューブを製造できる。   By the above, the flux application | coating with respect to both the flat surfaces 10a and 10b of the flat tube 10 can be completed, and the flat tube for heat exchangers in which the flux application layers 10g and 10h shown in FIG. 2 were formed can be manufactured.

次に、このフラックス塗布層１０ｇ、１０ｈを形成した熱交換器用偏平チューブを用いた熱交換器の製造方法を説明する。本実施形態は車両用空調装置の蒸発器に適用した例であり、最初に、蒸発器の構成の概要を図３により説明すると、偏平チューブ１０は蒸発器における冷媒通路を形成するものであって、図３の左右方向に多数本の偏平チューブ１０が所定間隔にて積層配置される。   Next, the manufacturing method of the heat exchanger using the flat tube for heat exchangers which formed this flux application layer 10g, 10h is demonstrated. This embodiment is an example applied to an evaporator of a vehicle air conditioner. First, an outline of the configuration of the evaporator will be described with reference to FIG. 3. The flat tube 10 forms a refrigerant passage in the evaporator. 3, a large number of flat tubes 10 are stacked and arranged at predetermined intervals in the left-right direction of FIG.

この多数本の偏平チューブ１０の長手方向の両端部は上下のヘッダー部材３０、３１の穴部に挿入されろう付けにより一体に接合される。この際、偏平チューブ１０の貫通穴１０ｆの両端部はヘッダー部材３０、３１の内部空間に連通する。多数本の偏平チューブ１０の相互間には、アルミニウム板材を波形状に折り曲げ成形したコルゲートフィン３２がチューブ１０の長手方向に延びるように配置される。   Both ends in the longitudinal direction of the multiple flat tubes 10 are inserted into the holes of the upper and lower header members 30 and 31 and joined together by brazing. At this time, both end portions of the through hole 10 f of the flat tube 10 communicate with the internal spaces of the header members 30 and 31. Between a large number of flat tubes 10, corrugated fins 32 formed by bending an aluminum plate into a wave shape are arranged so as to extend in the longitudinal direction of the tubes 10.

このコルゲートフィン３２の波形状の頂部は図４に示すように左右両隣りのチューブ１０の平坦面１０ａ、１０ｂに接触してろう付けされるようになっている。なお、図４は蒸発器のろう付け前の組み付け状態を示すもので、コルゲートフィン３２はアルミニウム合金芯材３２ａの表裏両面にろう材３２ｂをクラッドしたアルミニウム板材であるブレージングシートにて構成される。   As shown in FIG. 4, the corrugated fin 32 has a wave-shaped top portion that is brought into contact with the flat surfaces 10 a and 10 b of the adjacent tubes 10 and brazed. FIG. 4 shows an assembled state of the evaporator before brazing, and the corrugated fins 32 are constituted by a brazing sheet which is an aluminum plate material in which a brazing material 32b is clad on both front and back surfaces of an aluminum alloy core material 32a.

蒸発器では、周知のようにチューブ１０とコルゲートフィン３２により構成される熱交換コア部の空隙部を空気が矢印Ｂ方向に送風され、この送風空気とチューブ１０の貫通穴１０ｆ内を通過する冷媒とが、チューブ１０の壁面およびコルゲートフィン３２を介して熱交換を行う。これにより、冷媒の蒸発潜熱が送風空気から吸熱されて送風空気が冷却される。   In the evaporator, as is well known, air is blown in the direction of the arrow B through the gap of the heat exchange core portion constituted by the tube 10 and the corrugated fin 32, and the refrigerant passes through the blown air and the through hole 10 f of the tube 10. Performs heat exchange through the wall surface of the tube 10 and the corrugated fins 32. Thereby, the latent heat of vaporization of the refrigerant is absorbed from the blown air, and the blown air is cooled.

次に、上記構成の蒸発器を製造する製造方法を説明すると、蒸発器の各構成部品（偏平チューブ１０、ヘッダー部材３０、３１、コルゲートフィン３２等）を図１に示す所定構造に組み付け、その組付体（仮の組付状態）をワイヤ等の治具により締結して保持する。なお、図４はこの熱交換器組付工程で組付けた後の偏平チューブ１０とコルゲートフィン３２との組付状態を示す。   Next, a manufacturing method for manufacturing the evaporator having the above-described configuration will be described. Each component of the evaporator (flat tube 10, header members 30, 31, corrugated fins 32, etc.) is assembled to the predetermined structure shown in FIG. The assembled body (temporary assembled state) is fastened and held by a jig such as a wire. FIG. 4 shows an assembled state of the flat tube 10 and the corrugated fin 32 after being assembled in this heat exchanger assembling step.

次に、ろう付け工程を説明すると、上記組付体を治具にて保持してろう付け用加熱炉内に搬入して、蒸発器の各部品間を一体ろう付けする。ここで、ろう付け温度は各部品のアルミニウム材にクラッドされたろう材の融点を僅かに上回る６００°Ｃ付近の温度であり、このろう付け温度では偏平チューブ１０の両平坦面１０ａ、１０ｂの外面に形成されたフラックス塗布層１０ｇ、１０ｈが溶融状態（液体状態）となって、偏平チューブ１０とコルゲートフィン３２との接合面に、および偏平チューブ１０の長手方向両端部（図３の上下端部）とヘッダー部材３０、３１の穴部との接合面に行き渡る。   Next, the brazing process will be described. The assembly is held by a jig and carried into a brazing furnace, and the parts of the evaporator are brazed together. Here, the brazing temperature is a temperature in the vicinity of 600 ° C., which is slightly higher than the melting point of the brazing material clad on the aluminum material of each part. At this brazing temperature, the outer surfaces of both flat surfaces 10a and 10b of the flat tube 10 are used. The formed flux coating layers 10g and 10h are in a molten state (liquid state), and are joined to the joint surface between the flat tube 10 and the corrugated fins 32 and both longitudinal ends of the flat tube 10 (upper and lower ends in FIG. 3). And reaches the joint surface between the header members 30 and 31 and the holes.

この溶融フラックス成分により、各部品のアルミニウム材表面の酸化皮膜を還元して、溶融ろう材とアルミニウム母材表面との間の濡れ性を良好にする。また、ろう付け用加熱炉内は窒素ガス等の不活性ガスの雰囲気に維持されており、アルミニウム材表面の再酸化を防止する。以上により、各部品相互間の良好なろう付け性を確保する。   By this molten flux component, the oxide film on the surface of the aluminum material of each part is reduced, and the wettability between the molten brazing material and the surface of the aluminum base material is improved. The brazing furnace is maintained in an atmosphere of an inert gas such as nitrogen gas to prevent reoxidation of the aluminum material surface. By the above, the favorable brazing property between each component is ensured.

そして、上記組付体は所定のろう付け時間の間加熱炉内に置かれ、このろう付け時間が経過すると加熱炉から取り出され、上記組付体のろう付けが終了する。これにより、蒸発器を構成するアルミニウム熱交換器の組付が完成する。   The assembly is placed in a heating furnace for a predetermined brazing time, and when the brazing time has elapsed, the assembly is removed from the heating furnace, and brazing of the assembly is completed. Thereby, the assembly | attachment of the aluminum heat exchanger which comprises an evaporator is completed.

一方、偏平チューブ１０を上記ろう付け温度に加熱することにより、フラックス塗布層１０ｇ、１０ｈに含まれる亜鉛が偏平チューブ１０の両平坦面１０ａ、１０ｂの外面に拡散して、両平坦面１０ａ、１０ｂの外面に亜鉛層（亜鉛拡散層）が形成される。   On the other hand, by heating the flat tube 10 to the brazing temperature, zinc contained in the flux coating layers 10g and 10h diffuses to the outer surfaces of the flat surfaces 10a and 10b of the flat tube 10, and the flat surfaces 10a and 10b. A zinc layer (zinc diffusion layer) is formed on the outer surface of the substrate.

これにより、偏平チューブ１０の両平坦面１０ａ、１０ｂに対して亜鉛層の犠牲腐食効果を発揮するので、両平坦面１０ａ、１０ｂの耐食性を良好に確保できる。   Thereby, since the sacrificial corrosion effect of a zinc layer is exhibited with respect to both the flat surfaces 10a and 10b of the flat tube 10, the corrosion resistance of both the flat surfaces 10a and 10b can be ensured favorable.

一方、両側面部１０ｃ、１０ｄの外面には亜鉛層が形成されないが、偏平チューブ１０の両側面部１０ｃ、１０ｄの肉厚ｔ１を両平坦面１０ａ、１０ｂの肉厚ｔ２よりも厚くすることによって両側面部１０ｃ、１０ｄの耐食性を良好に確保できる。   On the other hand, the zinc layer is not formed on the outer surfaces of the both side surface portions 10c and 10d, but both the side surface portions 10c and 10d of the flat tube 10 are made thicker than the thickness t2 of the both flat surfaces 10a and 10b. The corrosion resistance of 10c and 10d can be ensured satisfactorily.

このように、両側面部１０ｃ、１０ｄに亜鉛層を形成することなく偏平チューブ１０全体の耐食性を良好に確保できるので、偏平チューブ１０の外面にフラックスを塗布するフラックス塗布工程をロールコート工程のみにすることができる。したがって、上記した従来のフラックス塗布方法に対して、両側面部１０ｃ、１０ｄにフラックスをスプレー塗布するスプレー工程を廃止することができ（図１の破線）、ひいては製造コストを低減することができる。   Thus, since the corrosion resistance of the whole flat tube 10 can be ensured satisfactorily without forming a zinc layer on both side surface portions 10c and 10d, the flux application process for applying the flux to the outer surface of the flat tube 10 is only the roll coating process. be able to. Therefore, in contrast to the above-described conventional flux coating method, the spraying process of spraying the flux on both side surface portions 10c and 10d can be eliminated (dashed line in FIG. 1), and the manufacturing cost can be reduced.

（第２実施形態）
上記第１実施形態では、複数個の内柱１０ｅの肉厚ｔ３が両側面部１０ｃ、１０ｄの肉厚ｔ１よりも薄く、かつ互いに同一になっているが、本第２実施形態では、図５に示すように、複数個の内柱１０ｅの肉厚ｔ３が、両側面部１０ｃ、１０ｄの肉厚ｔ１よりも薄く、かつチューブ幅方向（図５の左右方向）の中央側に位置する内柱からチューブ幅方向の両端側に位置する内柱に向かうにつれて厚くなっている。 (Second Embodiment)
In the first embodiment, the thickness t3 of the plurality of inner pillars 10e is smaller than the thickness t1 of the side surface portions 10c, 10d and is the same as each other. However, in the second embodiment, FIG. As shown, the thickness t3 of the plurality of inner pillars 10e is thinner than the thickness t1 of the side surface portions 10c, 10d, and the inner pillars are located on the center side in the tube width direction (left-right direction in FIG. 5). It becomes thicker toward the inner pillar located at both ends in the width direction.

上記第１実施形態では、複数個の内柱１０ｅの肉厚ｔ３が両側面部１０ｃ、１０ｄの肉厚ｔ１よりも薄く、かつ互いに同一になっているので、偏平チューブ１０の押出工程において、複数個の内柱１０ｅの押出圧は一定であるのに対し、両側面部１０ｃ、１０ｄの押出圧は複数個の内柱１０ｅの押出圧よりも高くなる。このため、両側面部１０ｃ、１０ｄにて押出圧が急変してしまうので、押出型の型寿命が短くなってしまう。   In the first embodiment, the thickness t3 of the plurality of inner pillars 10e is smaller than the thickness t1 of the side surface portions 10c, 10d and is the same as each other. While the extrusion pressure of the inner column 10e is constant, the extrusion pressures of the side surface portions 10c and 10d are higher than the extrusion pressure of the plurality of inner columns 10e. For this reason, since the extrusion pressure changes suddenly at the side surface portions 10c and 10d, the die life of the extrusion die is shortened.

これに対し、本実施形態では、チューブ幅方向の中央側の内柱からチューブ幅方向の両端側の内柱に向かうにつれて内柱１０ｅの肉厚ｔ３が厚くなっているので、チューブ幅方向の中央側からチューブ幅方向の両端側に向かうにつれて押出圧が徐々に高くなる。このため、両側面部１０ｃ、１０ｄにて押出圧が急変してしまうことを防止できるので、押出型の型寿命を長くすることができる。   On the other hand, in this embodiment, since the thickness t3 of the inner column 10e increases from the inner column on the center side in the tube width direction toward the inner column on both ends in the tube width direction, the center in the tube width direction is increased. The extrusion pressure gradually increases from the side toward both ends in the tube width direction. For this reason, since it is possible to prevent the extrusion pressure from changing suddenly at the side surface portions 10c and 10d, the die life of the extrusion die can be extended.

（他の実施形態）
なお、上記各実施形態では、両側面部１０ｃ、１０ｄの肉厚ｔ１が両平坦面１０ａ、１０ｂの肉厚ｔ２よりも厚くなっているが、両側面部１０ｃ、１０ｄのうち一方の側面部の肉厚ｔ１のみが両平坦面１０ａ、１０ｂの肉厚ｔ２よりも厚くなっていてもよい。 (Other embodiments)
In each of the above embodiments, the thickness t1 of the side surface portions 10c and 10d is thicker than the thickness t2 of the both flat surfaces 10a and 10b, but the thickness of one side surface portion of the both side surface portions 10c and 10d. Only t1 may be thicker than the thickness t2 of both flat surfaces 10a and 10b.

この場合には、他方の側面部にフラックス塗布層（亜鉛層）を形成して他方の側面部の耐食性を確保しなければならないのであるが、一方の側面部にフラックス塗布層（亜鉛層）を形成する必要がないことから、両側面部１０ｃ、１０ｄにフラックス塗布層（亜鉛層）を形成する場合に比べて製造コストを低減することができる。   In this case, a flux coating layer (zinc layer) must be formed on the other side surface portion to ensure the corrosion resistance of the other side surface portion. Since it does not need to form, manufacturing cost can be reduced compared with the case where a flux application layer (zinc layer) is formed on both side portions 10c and 10d.

すなわち、この場合には、フラックス塗布工程が、ロールコート工程とスプレー工程の２つの工程になってしまうものの、スプレー工程では他方の側面部のみに対してフラックスをスプレー塗布すればよいので、上記した従来のフラックス塗布方法のように両側面部に対してフラックスをスプレー塗布する場合に比べて製造コストを低減することができる。   That is, in this case, although the flux application process becomes two processes of a roll coat process and a spray process, in the spray process, it is only necessary to spray the flux only on the other side surface portion. The manufacturing cost can be reduced as compared with the case where the flux is spray applied to both side portions as in the conventional flux applying method.

さらに、この場合には、複数個の内柱１０ｅの肉厚ｔ３を、両側面部１０ｃ、１０ｄの肉厚ｔ１よりも薄く、かつ他方の側面部側に位置する内柱から一方の側面部側に位置する内柱に向かうにつれて厚くすれば、上記第２実施形態と同様の理由により、一方の側面部にて押出圧が急変してしまうことを防止でき、ひいては押出型の型寿命を長くすることができる。   Further, in this case, the thickness t3 of the plurality of inner pillars 10e is made thinner than the thickness t1 of the side faces 10c, 10d and from the inner pillar located on the other side face to one side face side. If the thickness is increased toward the inner pillar, the extrusion pressure can be prevented from changing suddenly at one side surface for the same reason as in the second embodiment, thereby extending the mold life of the extrusion mold. Can do.

また、上記各実施形態は、内柱１０ｅを有する偏平チューブ１０に本発明を適用した例を示しているが、これに限定されるものではなく、内柱１０ｅを有しない偏平チューブ１０に本発明を適用可能であることは勿論である。   Moreover, although each said embodiment has shown the example which applied this invention to the flat tube 10 which has the inner pillar 10e, it is not limited to this, This invention is applied to the flat tube 10 which does not have the inner pillar 10e. Of course, is applicable.

また、上記各実施形態は、車両用空調装置の蒸発器に本発明を適用した例を示しているが、これに限定されるものではなく、例えば車両用空調装置の凝縮器等、種々の熱交換器に本発明を適用可能であることは勿論である。   Each of the above embodiments shows an example in which the present invention is applied to an evaporator of a vehicle air conditioner. However, the present invention is not limited to this, and various heat sources such as a condenser of a vehicle air conditioner can be used. Of course, the present invention can be applied to an exchanger.

本発明の第１実施形態によるフラックス塗布方法の概要説明図である。It is an outline explanatory view of the flux application method by a 1st embodiment of the present invention. 第１実施形態による偏平チューブの断面図である。It is sectional drawing of the flat tube by 1st Embodiment. 図２の偏平チューブを適用した蒸発器の概要を示す斜視図である。It is a perspective view which shows the outline | summary of the evaporator to which the flat tube of FIG. 2 is applied. 図４の蒸発器のろう付け前の組み付け状態を示す要部拡大断面図である。It is a principal part expanded sectional view which shows the assembly | attachment state before brazing of the evaporator of FIG. 第２実施形態による偏平チューブの断面図である。It is sectional drawing of the flat tube by 2nd Embodiment.

符号の説明Explanation of symbols

１０ 偏平チューブ
１０ａ、１０ｂ 平坦面
１０ｃ、１０ｄ 側面部
１０ｅ 内柱
１０ｇ、１０ｈ 亜鉛を含むフラックス塗布層
ｔ１ 平坦面の肉厚
ｔ２ 側面部の肉厚
ｔ３ 内柱の肉厚 DESCRIPTION OF SYMBOLS 10 Flat tube 10a, 10b Flat surface 10c, 10d Side surface part 10e Inner pillar 10g, 10h Flux application layer containing zinc t1 Thickness of flat surface t2 Thickness of side part t3 Thickness of inner pillar

Claims (9)

偏平チューブ（１０）の外面に亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）を形成してなる熱交換器用偏平チューブであって、
前記偏平チューブ（１０）は、相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、前記両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有し、
前記両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）が前記両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
前記亜鉛を含む前記フラックス塗布層（１０ｇ、１０ｈ）が、前記両平坦面（１０ａ、１０ｂ）の外面のみに形成されていることを特徴とする熱交換器用偏平チューブ。 A flat tube for a heat exchanger in which a flux coating layer (10 g, 10 h) containing zinc is formed on the outer surface of the flat tube (10),
The flat tube (10) includes a flat surface (10a, 10b) on both sides facing each other, and a side surface (10c, 10d) that joins both ends in the width direction of the flat surfaces (10a, 10b). Have
The thickness (t1) of the both side surface portions (10c, 10d) is thicker than the thickness (t2) of the both flat surfaces (10a, 10b),
The flat tube for a heat exchanger, wherein the flux coating layer (10g, 10h) containing the zinc is formed only on the outer surfaces of the two flat surfaces (10a, 10b). 前記偏平チューブ（１０）は、前記両平坦面（１０ａ、１０ｂ）のうち前記幅方向における中間部同士を連結する内柱（１０ｅ）を有し、
前記内柱（１０ｅ）は、前記幅方向に複数個配置され、
前記偏平チューブ（１０）は、前記両平坦面（１０ａ、１０ｂ）、前記両側面部（１０ｃ、１０ｄ）および前記複数個の内柱（１０ｅ）が押出成形により一体成形されており、
前記複数個の内柱（１０ｅ）の肉厚（ｔ３）は、前記両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）よりも薄く、かつ前記幅方向の中央側に位置する内柱から前記幅方向の両端側に位置する内柱に向かうにつれて厚くなっていることを特徴とする請求項１に記載の熱交換器用偏平チューブ。 The flat tube (10) has an inner column (10e) for connecting intermediate portions in the width direction of the flat surfaces (10a, 10b).
A plurality of the inner pillars (10e) are arranged in the width direction,
In the flat tube (10), the flat surfaces (10a, 10b), the side surface portions (10c, 10d) and the plurality of inner pillars (10e) are integrally formed by extrusion molding.
The wall thickness (t3) of the plurality of inner pillars (10e) is thinner than the wall thickness (t1) of the side surface portions (10c, 10d), and the width from the inner pillar located on the center side in the width direction. The flat tube for a heat exchanger according to claim 1, wherein the tube becomes thicker toward an inner column located at both ends of the direction. 偏平チューブ（１０）の外面に亜鉛を含むフラックス塗布層（１０ｇ、１０ｈ）を形成してなる熱交換器用偏平チューブであって、
前記偏平チューブ（１０）は、相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、前記両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有し、
前記両側面部（１０ｃ、１０ｄ）のうち一方の側面部の肉厚（ｔ１）が前記両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
前記亜鉛を含む前記フラックス塗布層（１０ｇ、１０ｈ）が、前記両平坦面（１０ａ、１０ｂ）の外面および前記両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面のみに形成されていることを特徴とする熱交換器用偏平チューブ。 A flat tube for a heat exchanger in which a flux coating layer (10 g, 10 h) containing zinc is formed on the outer surface of the flat tube (10),
The flat tube (10) includes a flat surface (10a, 10b) on both sides facing each other, and a side surface (10c, 10d) that joins both ends in the width direction of the flat surfaces (10a, 10b). Have
The thickness (t1) of one side surface portion of the both side surface portions (10c, 10d) is thicker than the thickness (t2) of the both flat surfaces (10a, 10b),
The flux coating layer (10g, 10h) containing the zinc is formed only on the outer surface of the two flat surfaces (10a, 10b) and the outer surface of the other side surface portion of the both side surface portions (10c, 10d). A flat tube for heat exchangers. 前記偏平チューブ（１０）は、前記両平坦面（１０ａ、１０ｂ）のうち前記幅方向における中間部同士を連結する内柱（１０ｅ）を有し、
前記内柱（１０ｅ）は、前記幅方向に複数個配置され、
前記偏平チューブ（１０）は、前記両平坦面（１０ａ、１０ｂ）、前記両側面部（１０ｃ、１０ｄ）および前記複数個の内柱（１０ｅ）が押出成形により一体成形されており、
前記複数個の内柱（１０ｅ）の肉厚（ｔ３）は、前記一方の側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）よりも薄く、かつ前記他方の側面部側に位置する内柱から前記一方の側面部側に位置する内柱に向かうにつれて厚くなっていることを特徴とする請求項１または２に記載の熱交換器用偏平チューブ。 The flat tube (10) has an inner column (10e) for connecting intermediate portions in the width direction of the flat surfaces (10a, 10b).
A plurality of the inner pillars (10e) are arranged in the width direction,
In the flat tube (10), the flat surfaces (10a, 10b), the side surface portions (10c, 10d) and the plurality of inner pillars (10e) are integrally formed by extrusion molding.
The wall thickness (t3) of the plurality of inner pillars (10e) is thinner than the wall thickness (t1) of the one side surface part (10c, 10d) and is from the inner pillar located on the other side surface part side. The flat tube for a heat exchanger according to claim 1 or 2, wherein the tube is thicker toward an inner column located on the one side surface side. 前記偏平チューブ（１０）は、前記両平坦面（１０ａ、１０ｂ）のうち前記幅方向における中間部同士を連結する内柱（１０ｅ）を有し、
前記内柱（１０ｅ）は、前記幅方向に複数個配置され、
前記偏平チューブ（１０）は、前記両平坦面（１０ａ、１０ｂ）、前記両側面部（１０ｃ、１０ｄ）および前記複数個の内柱（１０ｅ）が押出成形により一体成形されており、
前記複数個の内柱（１０ｅ）の肉厚（ｔ３）は、前記両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）よりも薄く、かつ互いに同一になっていることを特徴とする請求項１または３に記載の熱交換器用偏平チューブ。 The flat tube (10) has an inner column (10e) for connecting intermediate portions in the width direction of the flat surfaces (10a, 10b).
A plurality of the inner pillars (10e) are arranged in the width direction,
In the flat tube (10), the flat surfaces (10a, 10b), the side surface portions (10c, 10d) and the plurality of inner pillars (10e) are integrally formed by extrusion molding.
The wall thickness (t3) of the plurality of inner pillars (10e) is smaller than the wall thickness (t1) of the side surface portions (10c, 10d) and is the same as each other. Or the flat tube for heat exchangers of 3. 相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、前記両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有する偏平チューブ（１０）を備え、
前記両側面部（１０ｃ、１０ｄ）の肉厚（ｔ１）が前記両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
前記両平坦面（１０ａ、１０ｂ）の外面のみに亜鉛層が形成されていることを特徴とする熱交換器。 A flat tube (10) having flat surfaces (10a, 10b) on both sides facing each other and side portions (10c, 10d) for joining both ends in the width direction of the flat surfaces (10a, 10b). Prepared,
The thickness (t1) of the both side surface portions (10c, 10d) is thicker than the thickness (t2) of the both flat surfaces (10a, 10b),
A heat exchanger, wherein a zinc layer is formed only on the outer surfaces of the flat surfaces (10a, 10b). 相対向する表裏両側の平坦面（１０ａ、１０ｂ）と、前記両平坦面（１０ａ、１０ｂ）の幅方向における両端部同士を結合する側面部（１０ｃ、１０ｄ）とを有する偏平チューブ（１０）を備え、
前記両側面部（１０ｃ、１０ｄ）のうち一方の側面部の肉厚（ｔ１）が前記両平坦面（１０ａ、１０ｂ）の肉厚（ｔ２）よりも厚くなっており、
前記両平坦面（１０ａ、１０ｂ）の外面および前記両側面部（１０ｃ、１０ｄ）のうち他方の側面部の外面のみに亜鉛層が形成されていることを特徴とする熱交換器。 A flat tube (10) having flat surfaces (10a, 10b) on both sides facing each other and side portions (10c, 10d) for joining both ends in the width direction of the flat surfaces (10a, 10b). Prepared,
The thickness (t1) of one side surface portion of the both side surface portions (10c, 10d) is thicker than the thickness (t2) of the both flat surfaces (10a, 10b),
A heat exchanger, wherein a zinc layer is formed only on an outer surface of the other flat surface (10a, 10b) and an outer surface of the other side surface portion of the both side surface portions (10c, 10d). 請求項１に記載の熱交換器用偏平チューブを製造する熱交換器用偏平チューブの製造方法であって、
前記偏平チューブ（１０）を押出成形する押出工程と、
前記押出工程の後に行われ、前記偏平チューブ（１０）の外面に前記亜鉛を含むフラックスを塗布するフラックス塗布工程とを備え、
前記フラックス塗布工程は、前記両平坦面（１０ａ、１０ｂ）の外面に前記フラックスをロールコート法により塗布するロールコート工程のみからなることを特徴とする熱交換器用偏平チューブの製造方法。 It is a manufacturing method of the flat tube for heat exchangers which manufactures the flat tube for heat exchangers of Claim 1,
An extrusion step of extruding the flat tube (10);
A flux application step that is performed after the extrusion step and that applies the flux containing zinc to the outer surface of the flat tube (10),
The method of manufacturing a flat tube for a heat exchanger, wherein the flux application step comprises only a roll coating step in which the flux is applied to the outer surfaces of the both flat surfaces (10a, 10b) by a roll coating method. 請求項３に記載の熱交換器用偏平チューブを製造する熱交換器用偏平チューブの製造方法であって、
前記偏平チューブ（１０）を押出成形する押出工程と、
前記押出工程の後に行われ、前記偏平チューブ（１０）の外面に前記亜鉛を含むフラックスを塗布するフラックス塗布工程とを備え、
前記フラックス塗布工程は、前記両平坦面（１０ａ、１０ｂ）の外面に前記フラックスをロールコート法により塗布するロールコート工程、および前記他方の側面部の外面のみに前記フラックスをスプレー塗布するスプレー工程のみからなることを特徴とする熱交換器用偏平チューブの製造方法。 It is a manufacturing method of the flat tube for heat exchangers which manufactures the flat tube for heat exchangers of Claim 3,
An extrusion step of extruding the flat tube (10);
A flux application step that is performed after the extrusion step and that applies the flux containing zinc to the outer surface of the flat tube (10),
The flux application process includes only a roll coating process in which the flux is applied to the outer surfaces of the flat surfaces (10a, 10b) by a roll coating method, and a spray process in which the flux is spray applied only to the outer surface of the other side surface portion. The manufacturing method of the flat tube for heat exchangers characterized by these.
JP2007327532A 2007-12-19 2007-12-19 Flat tube for heat exchanger, heat exchanger, and method for manufacturing flat tube for heat exchanger Pending JP2009150582A (en)

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