JP4103762B2 - Brazed flat tube - Google Patents

Brazed flat tube Download PDF

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JP4103762B2
JP4103762B2 JP2003356746A JP2003356746A JP4103762B2 JP 4103762 B2 JP4103762 B2 JP 4103762B2 JP 2003356746 A JP2003356746 A JP 2003356746A JP 2003356746 A JP2003356746 A JP 2003356746A JP 4103762 B2 JP4103762 B2 JP 4103762B2
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flat tube
bent
side edge
tube
brazed
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JP2005121296A (en
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周司 菰田
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Denso Corp
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Denso Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Description

本発明は、熱交換流体が流通するろう付け扁平チューブに関するものであり、一般にラジエータ、コンデンサ、エバポレータ、オイルクーラ等の熱交換器に使用するのに好適である。   The present invention relates to a brazed flat tube through which a heat exchange fluid flows, and is generally suitable for use in a heat exchanger such as a radiator, a condenser, an evaporator, and an oil cooler.

一般にラジエータ、コンデンサ等の熱交換器においては、コンパクト熱交換器と称する小形、高性能熱交換器が使用されている。このような熱交換器においては、例えば図１に示すようにチューブ１とコルゲート状のアウターフィン２とを交互に積み重ねて熱交換コア部を形成し、この熱交換コア部のチューブに両側からヘッダタンク４を取り付けることで熱交換器を形成しており、このような場合、小型化を図りつつ熱交換能力を確保するために、このチューブとして扁平チューブが使用されている。なお、このような熱交換器は、近年においては通常、アルミニウム材又はアルミニウム合金材で作られることが多い。   Generally, in heat exchangers such as radiators and condensers, small and high-performance heat exchangers called compact heat exchangers are used. In such a heat exchanger, for example, as shown in FIG. 1, tubes 1 and corrugated outer fins 2 are alternately stacked to form a heat exchange core portion, and headers are formed on the tube of this heat exchange core portion from both sides. A heat exchanger is formed by attaching the tank 4, and in such a case, a flat tube is used as this tube in order to ensure heat exchange capability while achieving downsizing. In recent years, such a heat exchanger is usually made of an aluminum material or an aluminum alloy material.

従来においては、このような扁平チューブとして、電縫管や押し出し成形管が使用されていたが、何れもコストが嵩むだけでなく、電縫管の場合、伝熱効率向上のためにインナーフィンを管の開口から挿入しなければならず、その挿入作業が面倒になるという問題があった。また押し出し成形管の場合、成形時に管の内部にインナーフィンに代わって熱交換性能を向上させる構造を設けることができるが、そのため肉厚を薄くすることが難しく、肉厚が厚くする分、熱交換性能を向上させることができないという問題があった。   Conventionally, as such a flat tube, an electric-welded tube or an extruded tube has been used, but not only the cost increases, but in the case of an electric-welded tube, an inner fin is used to improve heat transfer efficiency. There is a problem that the insertion work becomes troublesome. In the case of an extruded tube, a structure that improves the heat exchange performance can be provided inside the tube in place of the inner fin during molding, but it is difficult to reduce the wall thickness. There was a problem that the exchange performance could not be improved.

このため、１枚の長尺状の板材の片側にコルゲート状のインナーフィンを置いた状態で、この板材の中間部をＵ字形に折り返し、板材の両側縁の折り曲げ部同志を突き合わせて、この突き合わせ部をろう付けすることにより、インナーフィンが内挿された扁平チューブを形成することが、知られている（特許文献１参照）。
特開平３−３５８３０号公報（第５頁、第７，８図） しかしながら、上記公知の技術の扁平チューブでは、突き合わせ部がチューブから突出するために、その分、熱交換器の厚さを薄くできないという問題がある。 For this reason, with the corrugated inner fin placed on one side of one long plate, the middle part of this plate is folded back into a U-shape, and the bent portions on both side edges of the plate are brought together to meet each other. It is known that a flat tube in which an inner fin is inserted is formed by brazing the portion (see Patent Document 1).
However, since the butt portion protrudes from the tube, the thickness of the heat exchanger is reduced accordingly. There is a problem that you can not.

このチューブから突出した突き合わせ部を無くすために、図３に示されるインナーフィンが内挿された扁平チューブが、知られている。即ち、長尺状板材１０の両側縁部を向かい合う方向に曲げて側縁弯曲部１０ａ，１０ｂを形成すると共に、長尺状板材１０の片側にインナーフィン１１を置いて、長尺状板材１０の中間部１０ｃをＵ字形に折り返し、両側縁部の側縁弯曲部１０ａ，１０ｂを重ね合わせ、この重ね合わせ部をろう付けすることにより、インナーフィン１１が内挿された扁平チューブ１が形成される。なお、重ね合わせ部をろう付けするときに、インナーフィン１１とチューブ１内面もろう付けされる。   In order to eliminate the butted portion protruding from the tube, a flat tube in which an inner fin shown in FIG. 3 is inserted is known. That is, the side edges of the long plate 10 are bent in opposite directions to form side edge bent portions 10a and 10b, and the inner fin 11 is placed on one side of the long plate 10 to The flat portion 1 in which the inner fin 11 is inserted is formed by folding the intermediate portion 10c into a U shape, overlapping the side edge bent portions 10a and 10b on both side edges, and brazing the overlapping portions. . When the overlapping portion is brazed, the inner fin 11 and the inner surface of the tube 1 are also brazed.

しかしながら、このような長尺状板材１０の中間部１０ｃをＵ字形に折り返して扁平チューブ１を形成するものでは、Ｕ字形に折り返す折曲部１０ｃのスプリングバックによって、図３のＢ部の拡大図で示すように、折曲部１０ｃの近傍のインナーフィン１１面とチューブ１内面との接触が悪くなりがちで、ろう付け時に折曲部１０ｃ近傍のインナーフィン１１に未ろう付けが発生し易い。このようなインナーフィン１１の未ろう付けは、チューブの耐圧強度の低下につながるという問題がある。   However, in the case where the flat portion 1 is formed by folding the intermediate portion 10c of such a long plate member 10 into a U shape, the enlarged view of the portion B in FIG. 3 is obtained by the spring back of the bent portion 10c folded back into the U shape. As shown, the contact between the inner fin 11 surface in the vicinity of the bent portion 10c and the inner surface of the tube 1 tends to be poor, and the brazing of the inner fin 11 in the vicinity of the bent portion 10c is likely to occur during brazing. Such unbrazing of the inner fin 11 has a problem that the pressure resistance of the tube is reduced.

本発明は、上記問題に鑑みてなされたもので、その目的は、長尺状板材の中間部を折り曲げて形成する、インナーフィンが内挿された扁平チューブにおいて、折曲部近傍のインナーフィンとチューブ内面との未ろう付けの発生を防止し、チューブの耐圧強度の低下を防ぐことである。   The present invention has been made in view of the above problems, and the object thereof is to form an inner fin in the vicinity of a bent portion in a flat tube in which an inner fin is inserted, which is formed by bending an intermediate portion of a long plate material. It is to prevent the occurrence of unbrazing with the inner surface of the tube and to prevent a decrease in pressure resistance of the tube.

本発明は、前記課題を解決するための手段として、特許請求の範囲の各請求項に記載のろう付け扁平チューブを提供する。
請求項１に記載のろう付け扁平チューブは、長尺状板材の上面の片側にインナーフィンを載置して、その略中間部を両側縁部が同一方向を向くようにＵ字状に折曲して両側縁部を重ね合わせて、ろう付けして形成するろう付け扁平チューブであって、その長尺状板材の略中間部に曲げ剛性が小さい弱剛性部を形成すると共に、この弱剛性部が、ろう付け扁平チューブの両端部がヘッダプレートに形成されるチューブ用穴に挿入される際のヘッダプレートに挿入される部位を除いた部位に設けられたものである。これにより、長尺状板材の略中間部を折曲してチューブを形成する際の折曲部のスプリングバックによる折曲部近傍でのインナーフィンとチューブ内面との接触不良による未ろう付けの発生を防止でき、チューブの耐圧強度の低下を防止できる。また、ヘッダプレートに挿入される部位を除く部位に、弱剛性部が設けられているので、ヘッダプレートに形成されたチューブ用穴と扁平チューブとの隙間を小さくすることができる。
また、請求項２のろう付け扁平チューブは、長尺状板材の略中間部に形成した弱剛性部が、薄肉部又は切り欠き部であることを規定したものである。 The present invention provides a brazed flat tube according to each of the claims as means for solving the problems.
The brazed flat tube according to claim 1 is configured such that an inner fin is placed on one side of the upper surface of the long plate material, and a substantially middle portion thereof is bent into a U shape so that both side edges are directed in the same direction. And a brazed flat tube formed by superimposing both side edges and brazing, and forming a weak rigid portion with a small bending rigidity at a substantially middle portion of the long plate material , and this weak rigid portion However, it is provided in the site | part except the site | part inserted in the header plate when the both ends of a brazing flat tube are inserted in the hole for tubes formed in a header plate . As a result, unbrazing occurs due to poor contact between the inner fin and the inner surface of the tube in the vicinity of the bent portion due to the spring back of the bent portion when the tube is formed by bending a substantially middle portion of the long plate material. It is possible to prevent the pressure resistance strength of the tube from decreasing. Moreover, since the weakly rigid part is provided in the site | part except the site | part inserted in a header plate, the clearance gap between the hole for tubes formed in the header plate and the flat tube can be made small.
Moreover, the brazed flat tube of Claim 2 prescribes | regulates that the weakly rigid part formed in the substantially intermediate part of the elongate board | plate material is a thin part or a notch part.

請求項３に記載のろう付け扁平チューブは、長尺状板材の上面の片側にインナーフィンを載置して、その略中間部を両側縁部が同一方向を向くようにＵ字状に折曲して両側縁部を重ね合わせて、ろう付けして形成するろう付け扁平チューブであって、その長尺状板材の略中間部に曲げ剛性が小さい弱剛性部を形成し、かつその長尺状板材の両側縁部に向かい合う方向に向けて曲げた側縁弯曲部を形成すると共に、この両側縁弯曲部が重ね合わせられたときに、内側にくる側縁弯曲部の先端が、外側の側縁弯曲部の内面に向けて、内側の側縁弯曲部の半径より外方に曲げられているものであり、これにより、ろう付けの際に内側の側縁弯曲部の先端を外側の側縁弯曲部の内面に確実に当接させることができ、外側の側縁弯曲部の先端の内側の側縁弯曲部の外面への当接と共に、少なくとも２個所の当接点を確保できてろう廻り起点Ｐとすることができ、ろう廻り長さを長くすることができ、重ね合わせ部のろう付けの信頼性を向上できる。また、長尺状板材の略中間部を折曲してチューブを形成する際の折曲部のスプリングバックによる折曲部近傍でのインナーフィンとチューブ内面との接触不良による未ろう付けの発生を防止でき、チューブの耐圧強度の低下を防止できる。
請求項４のろう付け扁平チューブは、請求項２と同じ技術内容で単に従属先が請求項３になっただけである。 The brazed flat tube according to claim 3 is configured such that an inner fin is placed on one side of the upper surface of the long plate member, and a substantially intermediate portion thereof is bent into a U shape so that both side edges are directed in the same direction. And a brazed flat tube formed by superimposing both side edges and brazing, and forming a weakly rigid portion having a small bending rigidity at a substantially middle portion of the elongated plate material, and its long shape A side edge bent portion that is bent in a direction facing both side edges of the plate material is formed, and when the side edge bent portions are overlapped, the tip of the side edge bent portion that is on the inner side is the outer side edge. It is bent outward from the radius of the inner side edge bent portion toward the inner surface of the bent portion, so that the tip of the inner side edge bent portion is bent to the outer side edge bent during brazing. The inner side of the tip of the outer side edge bent part Along with the contact of the bent portion with the outer surface, at least two contact points can be secured and the brazing start point P can be obtained, the brazing length can be lengthened, and the brazing reliability of the overlapped portion can be increased. Can be improved. In addition, when the tube is formed by bending a substantially middle portion of the long plate material, unbrazing occurs due to poor contact between the inner fin and the inner surface of the tube due to the spring back of the bent portion. It can prevent, and the fall of the pressure strength of a tube can be prevented.
The brazed flat tube according to claim 4 has the same technical content as that of claim 2, and the dependent party is merely claim 3.

請求項５のろう付け扁平チューブは、弱剛性部がチューブの長手方向全域に渡って設けられていることを規定したものであり、これにより、扁平チューブを製造するにあたって、折り曲げられた際に略中間部に相当する部位に弱剛性部が連続的に形成された板材を折り曲げ加工し、所望するチューブ長さに切断すればよく、製造時におけるチューブ長さの変更に容易に対応することができる。
請求項６のろう付け扁平チューブは、内側の側縁弯曲部の外方に曲げられた先端近辺にも曲げ剛性が小さい弱剛性部を形成したものであり、これにより、内側の側縁弯曲部の半径より外方に容易に曲げられると共に、後で容易に内方に曲げ戻すことができる。 The brazed flat tube according to claim 5 stipulates that the weakly rigid portion is provided over the entire longitudinal direction of the tube, so that when the flat tube is manufactured, it is substantially not bent. A plate material in which a weakly rigid portion is continuously formed in a portion corresponding to the intermediate portion may be bent and cut to a desired tube length, and it is possible to easily cope with a change in the tube length during manufacturing. .
Brazing the flat tube according to claim 6, which also flexural rigidity bent tip around the outside of the inner side edge curved portion to form a small weak rigidity portion, thereby, the inside of the side edges curved portions with readily bent outwardly than the radius of Ru can later return easily bent inwardly.

以下、図面に基づいて本発明の実施の形態のろう付け扁平チューブについて説明する。図１は、本発明のろう付け扁平チューブを使用した熱交換器の全体構成を示す３面（正面、平面、側面）図である。熱交換器のコア部は、扁平チューブ１とコルゲート状のアウターフィン２とを交互に積層することによって形成されている。扁平チューブ１の両端は、それぞれヘッダタンク４Ａ，４Ｂによって覆われたヘッダプレート３Ａ，３Ｂに連結されている。それぞれのヘッダタンク４Ａ，４Ｂは、パイプ５Ａ，５Ｂによって連結され、熱交換流体の出入口となっている。熱交換器のコア部の外側面には、補強材としてサイドプレート６が取り付けられている。図１には示されていないが、扁平チューブ１の内部には、インナーフィンが設けられている。このような熱交換器は、一般には扁平チューブ１の内部を液体の熱交換流体を流し、扁平チューブ１の外部を気体の熱交換流体を流すことで、両者の熱交換を行っている。また一般に、アウターフィン２と扁平チューブ１とは、フィンまたはチューブにクラッドされたろう材によってろう付けされている。   Hereinafter, a brazed flat tube according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a three-sided view (front, plane, side) showing the overall structure of a heat exchanger using the brazed flat tube of the present invention. The core part of the heat exchanger is formed by alternately laminating flat tubes 1 and corrugated outer fins 2. Both ends of the flat tube 1 are connected to header plates 3A and 3B covered by header tanks 4A and 4B, respectively. Each header tank 4A, 4B is connected by pipes 5A, 5B, and serves as an inlet / outlet for heat exchange fluid. A side plate 6 is attached to the outer surface of the core portion of the heat exchanger as a reinforcing material. Although not shown in FIG. 1, an inner fin is provided inside the flat tube 1. Such a heat exchanger generally exchanges heat by flowing a liquid heat exchange fluid inside the flat tube 1 and flowing a gas heat exchange fluid outside the flat tube 1. In general, the outer fin 2 and the flat tube 1 are brazed with a brazing material clad on the fin or the tube.

図２は、本発明の実施の形態の扁平チューブの断面図とその要部Ａの拡大断面図である。本発明の扁平チューブ１は、長尺状板材１０の上面の片側にインナーフィン１１を載置し、その略中間部１０ｃをＵ字状に折曲して、インナーフィン１１が載置されていない他方の片側をインナーフィン１１上に載せ、長尺状板材１０の両側縁部を重ね合わせて、この重ね合わせ部をろう付けすることによって形成される。なお、重ね合わせ部をろう付けするとき、インナーフィン１１と扁平チューブ１０内面もろう付けされる。長尺状板材１０の両側縁部には、向かい合う方向に向けて曲げた略半円状の側縁弯曲部１０ａ，１０ｂがそれぞれ形成されていて、両者が重ね合わされる。   FIG. 2 is a cross-sectional view of a flat tube according to an embodiment of the present invention and an enlarged cross-sectional view of a main part A thereof. In the flat tube 1 of the present invention, the inner fin 11 is placed on one side of the upper surface of the long plate member 10, and the substantially intermediate portion 10 c is bent into a U-shape so that the inner fin 11 is not placed. The other side is placed on the inner fin 11, the side edges of the long plate 10 are overlapped, and the overlapping portion is brazed. In addition, when brazing an overlapping part, the inner fin 11 and the flat tube 10 inner surface are also brazed. On both side edges of the long plate member 10 are formed substantially semicircular side edge bent parts 10a and 10b bent in the opposite direction, and both are overlapped.

図２の要部Ａの拡大図に示すように、長尺状板材１０の略中間部１０ｃをＵ字状に折り曲げて形成される折曲部１０ｃには、本願発明の特徴である、折曲部１０ｃのスプリングバック力を弱くする第１の弱剛性部１０ｄがチューブ長手方向全域に渡って形成されている。この第１の弱剛性部１０ｄは、折曲部１０ｃの肉厚を他の部分の肉厚よりも徐々に薄くした薄肉部としてもよいし、折曲部１０ｃの一部を内面から切り欠いた切り欠き部としてもよい。このように折曲部１０ｃに第１の弱剛性部１０ｄを設けることによって、長尺状板材１０を折曲した際のスプリングバック力を弱くすることができ、折曲部１０ｃ近傍とチューブ内面との密着性を良くすることができ、ろう付けの際のインナーフィン１１とチューブ１内面との未ろう付けの発生を防止することができる。
また、上述した実施例では、第１の弱剛性部１０ｄは、チューブ長手方向全域に渡って設けられており、扁平チューブ１は、第１の弱剛性部１０ｄが連続的に形成された長尺状板材１０を折曲形成した後、所望する長さに切断することによって得ることができる。そのため、製造時のチューブの長さの変更に容易に対応することができる。 As shown in the enlarged view of the main part A in FIG. 2, the bent portion 10 c formed by bending the substantially intermediate portion 10 c of the long plate material 10 into a U-shape is bent, which is a feature of the present invention. A first weakly rigid portion 10d that weakens the springback force of the portion 10c is formed over the entire tube longitudinal direction. The first weakly rigid portion 10d may be a thin portion in which the thickness of the bent portion 10c is gradually thinner than the thickness of other portions, or a part of the bent portion 10c is cut out from the inner surface. It is good also as a notch. By providing the first weakly rigid portion 10d in the bent portion 10c in this way, the springback force when the long plate member 10 is bent can be weakened, and the vicinity of the bent portion 10c, the inner surface of the tube, Can be improved, and the occurrence of unbrazing between the inner fin 11 and the inner surface of the tube 1 during brazing can be prevented.
Moreover, in the Example mentioned above, the 1st weak rigid part 10d is provided over the tube longitudinal direction whole region, and the flat tube 1 is the elongate in which the 1st weak rigid part 10d was formed continuously. It can be obtained by bending the shaped plate member 10 and then cutting it into a desired length. Therefore, it can respond easily to the change of the length of the tube at the time of manufacture.

上記した折曲部１０ｃの第１の弱剛性部１０ｄは、チューブ長手方向全域に渡って設けることが望ましいが、チューブ長手方向に沿って部分的に設けてもよい。例えば、扁平チューブ１の両端は、図１に示すようにヘッダプレート３Ａ，３Ｂのチューブ用穴（図示せず）に挿入嵌合されて、ろう付け固定されるので、その両端は、スプリングバックの影響を受けることがないので、この部分には弱剛性部１０ｄを設ける必要はない。即ち、チューブ用穴への嵌合部分では、強制的にインナーフィンとチューブ内面とは密着させられるので、弱剛性部１０ｄを設けなくてもよい。このように、チューブ用穴に挿入される部分を除いた部位に弱剛性部１０ｄが設けられたチューブとすると、ヘッダプレート３Ａ，３Ｂのチューブ用穴とチューブ１の壁面との隙間を小さくすることができる。
また、上述した実施例と同様に折曲部１０ｃのスプリングバック力を弱くすることができる程度であれば、ヘッダプレートに挿入される部位以外の部位に弱剛性部１０ｄが設けられていない部位があってもよい。 The first weakly rigid portion 10d of the bent portion 10c described above is desirably provided over the entire tube longitudinal direction, but may be partially provided along the tube longitudinal direction. For example, both ends of the flat tube 1 are inserted and fitted into tube holes (not shown) of the header plates 3A and 3B as shown in FIG. 1 and fixed by brazing. Since there is no influence, it is not necessary to provide the weakly rigid portion 10d in this portion. That is, in the fitting portion to the tube hole, the inner fin and the inner surface of the tube are forcibly brought into close contact with each other, so that the weakly rigid portion 10d need not be provided. As described above, when the tube is provided with the weakly rigid portion 10d in the portion excluding the portion inserted into the tube hole, the gap between the tube hole of the header plates 3A and 3B and the wall surface of the tube 1 is reduced. Can do.
Similarly to the above-described embodiment, if the springback force of the bent portion 10c can be weakened, there is a portion where the weakly rigid portion 10d is not provided in a portion other than the portion inserted into the header plate. There may be.

また、長尺状板材１０の両側縁部を弯曲状に重ね合わせたとき、内側となる側縁弯曲部１０ａの先端１０ｅのみは、外側となる側縁弯曲部１０ｂの内面に接触するように、その内面に向けて、内側の側縁弯曲部１０ａの半径よりも外方に曲げられている。このようにすることによって、ろう付けの際に内側の側縁弯曲部１０ａの先端１０ｅ、外側の側縁弯曲部１０ｂの内面に確実に当接させることができ、外側の側縁弯曲部１０ｂの先端１０ｅの内側の側縁弯曲部１０ａの外面への当接と共に、少なくとも２個所の当接点を確保できてろう廻り起点Ｐとすることができ、ろう廻り長さを長くすることができ、重ね合わせ部のろう付けの信頼性を向上できる。   Further, when both side edges of the long plate material 10 are overlapped in a curved shape, only the tip 10e of the side edge bent portion 10a that is the inner side is in contact with the inner surface of the side edge bent portion 10b that is the outer side. The inner side edge bent portion 10a is bent outward from the radius toward the inner surface. By doing in this way, at the time of brazing, it can be made to contact | abut reliably at the front-end | tip 10e of the inner side edge bending part 10a, and the inner surface of the outer side edge bending part 10b, and the outer side edge bending part 10b Along with the contact with the outer surface of the side edge bent portion 10a on the inner side of the tip 10e, at least two contact points can be secured and the brazing start point P can be obtained, the brazing length can be increased, The reliability of brazing of the mating part can be improved.

また、内側の側縁弯曲部１０ａの外方に曲げられた先端１０ｅを後で容易に内方に曲げ戻すことができるように、その先端１０ｅの近傍には、曲げ剛性を小さくした第２の弱剛性部１０ｆが設けられている。この第２の弱剛性部１０ｆも、薄肉部又は切り欠き部にする等により形成される。   Further, in order to be able to easily bend the tip 10e bent outwardly of the inner side edge bent portion 10a later inward, a second bending rigidity is reduced in the vicinity of the tip 10e. A weakly rigid portion 10f is provided. The second weakly rigid portion 10f is also formed by a thin portion or a cutout portion.

更に、重ね合わせ部の外側になる側縁弯曲部１０ｂの先端１０ｇを、断面先細状に形成してもよい。これにより、外側の側縁弯曲部１０ｂの先端１０ｇの曲げ剛性も小さくでき、内側の側縁弯曲部１０ａの弯曲に沿って曲げ易くなり、ろう廻り起点Ｐを生成し易い。また、扁平チューブ１の曲面を滑かにすることができ、扁平チューブ１を取り付けるヘッダプレート３Ａ，３Ｂのチューブ用穴の形成が容易となる。   Furthermore, you may form the front-end | tip 10g of the side edge curved part 10b used as the outer side of an overlapping part in a cross-sectional taper shape. As a result, the bending rigidity of the tip 10g of the outer side edge bent portion 10b can be reduced, and it becomes easy to bend along the bent portion of the inner side edge bent portion 10a. Moreover, the curved surface of the flat tube 1 can be made smooth, and formation of the tube hole of header plate 3A, 3B which attaches the flat tube 1 becomes easy.

この長尺状板材１０は、好ましくはアルミニウム又はアルミニウム合金が使用され、この板材１０の内側（チューブ内面側）又は両面には、予めろう材がクラッドされていることが好ましい。このようにして、扁平チューブ１の形成作業とインナーフィンの挿入作業とを一度に同時に行うことができ、１回のろう付け作業でインナーフィンを挿入したろう付け扁平チューブを作成できる。   The long plate 10 is preferably made of aluminum or an aluminum alloy, and it is preferable that a brazing material is clad in advance on the inner side (tube inner side) or both sides of the plate 10. In this way, the forming operation of the flat tube 1 and the inserting operation of the inner fin can be performed at the same time, and a brazed flat tube into which the inner fin has been inserted can be created by a single brazing operation.

本発明のろう付け扁平チューブを使用する熱交換器の全体構成を示す３面（正面、平面、側面）図である。It is a 3 surface (front, plane, side) figure which shows the whole structure of the heat exchanger which uses the brazing flat tube of this invention. 本発明の実施の形態のろう付け扁平チューブを説明する図及びその要部Ａの拡大図である。It is the figure explaining the brazing flat tube of embodiment of this invention, and the enlarged view of the principal part A. 従来のろう付け扁平チューブを説明する図及びその要部Ｂの拡大図である。It is the figure explaining the conventional brazing flat tube, and the enlarged view of the principal part B.

符号の説明Explanation of symbols

１…扁平チューブ
１０…長尺状板材
１０ａ…内側の側縁弯曲部
１０ｂ…外側の側縁弯曲部
１０ｃ…折曲部（中間部）
１０ｄ…第１の弱剛性部
１０ｅ…内側の側縁弯曲部の先端
１０ｆ…第２の弱剛性部
１０ｇ…外側の側縁弯曲部の先端
１１…インナーフィン DESCRIPTION OF SYMBOLS 1 ... Flat tube 10 ... Elongate board | plate material 10a ... Inner side edge bending part 10b ... Outer side edge bending part 10c ... Bending part (intermediate part)
10d: first weakly rigid portion 10e: tip 10f of inner side edge curved portion ... second weakly rigid portion 10g ... tip 11 of outer side edge curved portion ... inner fin

Claims (6)

長尺状板材の上面の片側にインナーフィンを載置すると共に、その略中間部を、両側縁部が同一方向を向くようにＵ字状に折曲して、この両側縁部を重ね合わせ、この重ね合わせ部をろう付けして形成する、インナーフィンを内挿したろう付け扁平チューブにおいて、
前記長尺状板材の略中間部に、曲げ剛性が小さい弱剛性部が形成されていると共に、前記弱剛性部が、前記ろう付け扁平チューブの両端部がヘッダプレートに形成されるチューブ用穴に挿入される際の前記ヘッダプレートに挿入される部位を除いた部位に設けられていることを特徴とするろう付け扁平チューブ。 While placing the inner fin on one side of the upper surface of the long plate material, its substantially middle part is bent in a U shape so that both side edges face the same direction, and both side edges are overlapped, In this brazed flat tube with an inner fin inserted,
A weakly rigid portion having a small bending rigidity is formed in a substantially middle portion of the long plate material, and the weakly rigid portion is formed in a tube hole formed at both end portions of the brazed flat tube in the header plate. A brazed flat tube provided in a portion excluding a portion inserted into the header plate when inserted . 前記弱剛性部が、薄肉部又は切り欠き部であることを特徴とする請求項１に記載のろう付け扁平チューブ。   The brazed flat tube according to claim 1, wherein the weakly rigid portion is a thin-walled portion or a notched portion. 長尺状板材の上面の片側にインナーフィンを載置すると共に、その略中間部を、両側縁部が同一方向を向くようにＵ字状に折曲して、この両側縁部を重ね合わせ、この重ね合わせ部をろう付けして形成する、インナーフィンを内挿したろう付け扁平チューブにおいて、While placing the inner fin on one side of the upper surface of the long plate material, its substantially middle part is bent in a U shape so that both side edges face the same direction, and both side edges are overlapped, In this brazed flat tube with an inner fin inserted,
前記長尺状板材の略中間部に、曲げ剛性が小さい弱剛性部が形成されており、かつA weakly rigid portion having a small bending rigidity is formed in a substantially middle portion of the long plate material, and
前記長尺状板材の両側縁部に向かい合う方向に向けて曲げた側縁弯曲部が形成されていると共に、前記重ね合わせ部の内側の側縁弯曲部の先端が、外側の側縁弯曲部の内面に向けて、前記内側の側縁弯曲部の半径よりも外方に曲げられていることを特徴とするろう付け扁平チューブ。A side edge bent portion bent in a direction facing both side edge portions of the elongated plate material is formed, and a tip of the side edge bent portion on the inner side of the overlapping portion is formed on the outer side edge bent portion. A brazed flat tube characterized by being bent outward from the radius of the inner side edge bent portion toward the inner surface. 前記弱剛性部が、薄肉部又は切り欠き部であることを特徴とする請求項３に記載のろう付け扁平チューブ。 The brazed flat tube according to claim 3 , wherein the weakly rigid portion is a thin-walled portion or a notch portion. 前記弱剛性部が、チューブの長手方向全域に渡って設けられることを特徴とする請求項３又は４に記載のろう付け扁平チューブ。 The brazed flat tube according to claim 3 or 4 , wherein the weakly rigid portion is provided over the entire longitudinal direction of the tube. 前記内側の側縁弯曲部の外方に曲げられた先端近辺に曲げ剛性が小さい弱剛性部が更に形成されていることを特徴とする請求項３、４又は５に記載のろう付け扁平チューブ。 6. The brazed flat tube according to claim 3 , wherein a weakly rigid portion having a small bending rigidity is further formed near a tip bent outward of the inner side edge bent portion.
JP2003356746A 2003-10-16 2003-10-16 Brazed flat tube Expired - Fee Related JP4103762B2 (en)

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