JP7233857B2 - Double tube joining method in heat exchanger - Google Patents

Double tube joining method in heat exchanger Download PDF

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JP7233857B2
JP7233857B2 JP2018112133A JP2018112133A JP7233857B2 JP 7233857 B2 JP7233857 B2 JP 7233857B2 JP 2018112133 A JP2018112133 A JP 2018112133A JP 2018112133 A JP2018112133 A JP 2018112133A JP 7233857 B2 JP7233857 B2 JP 7233857B2
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tube
inner tube
brazing
outer tube
heat exchanger
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JP2019215123A (en
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太一 鈴木
武宜 土公
尚希 山下
誠 吉野
潤一 小野
憲 山本
亮太 中嶋
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UACJ Corp
UACJ Extrusion Corp
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UACJ Corp
UACJ Extrusion Corp
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Priority to PCT/JP2019/023379 priority patent/WO2019240204A1/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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
    • 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
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • 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
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • 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

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

Description

本発明は、熱交換器における二重管の接合方法に関する。 The present invention relates to a method for joining double tubes in a heat exchanger.

自動車等の車両においては、同車両の所定箇所を冷却したり加熱したりする流体が循環回路を循環しており、そうした循環回路中に流体同士の熱交換を行うための熱交換器が設けられる場合がある。上記熱交換器としては、アルミニウム合金製の外管及び内管からなる二重管を備えており、それら内管と外管との間を流れる流体と同内管の内部を流れる流体との間で熱交換を行うものが知られている。 In a vehicle such as an automobile, a fluid that cools or heats a predetermined portion of the vehicle circulates in a circulation circuit, and a heat exchanger is provided in the circulation circuit to exchange heat between the fluids. Sometimes. The heat exchanger is provided with a double tube consisting of an outer tube and an inner tube made of an aluminum alloy. It is known to exchange heat with

また、上述したように二重管を備える熱交換器において、特許文献１に示されるように、周方向に複数の凹凸が並ぶ円環状のインナーフィンを外管と内管との間に挿入し、インナーフィンを外管の内周と内管の外周とに対しそれぞれろう付することが提案されている。この場合、熱交換器の外管と内管とがインナーフィンを介してろう付によって互いに接合されるため、熱交換器の外管及び内管からなる二重管を強固なものとすることができる。その結果、車両の振動が熱交換器に伝達されるとしても、それに伴い熱交換器の二重管で異音が生じることを抑制できるようになる。 In addition, in the above-described heat exchanger having a double tube, as shown in Patent Document 1, an annular inner fin having a plurality of irregularities arranged in the circumferential direction is inserted between the outer tube and the inner tube. It has been proposed to braze the inner fins to the inner circumference of the outer tube and to the outer circumference of the inner tube, respectively. In this case, since the outer tube and the inner tube of the heat exchanger are joined to each other by brazing through the inner fins, the double tube consisting of the outer tube and the inner tube of the heat exchanger can be made strong. can. As a result, even if the vibration of the vehicle is transmitted to the heat exchanger, it is possible to suppress the occurrence of abnormal noise in the double pipe of the heat exchanger.

特開平２－３０９１９２号公報JP-A-2-309192

しかし、特許文献１に示されるようにインナーフィンを介してろう付によって外管と内管とを接合する場合、外管と内管との間にインナーフィンを挿入し、更にインナーフィンを外管の内周と内管の外周とに対しそれぞれろう付しなければならず、それらの実現に手間がかかることは否めない。 However, when the outer tube and the inner tube are joined by brazing through the inner fins as shown in Patent Document 1, the inner fins are inserted between the outer tube and the inner tube, and the inner fins are further attached to the outer tube. It is undeniable that brazing must be performed on the inner circumference of the inner tube and the outer circumference of the inner tube, respectively, and it takes time and effort to realize them.

本発明の目的は、手間をかけることなく外管と内管とをろう付によって接合することができる熱交換器における二重管の接合方法を提供することにある。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for joining double tubes in a heat exchanger, which can join an outer tube and an inner tube by brazing without taking much time.

以下、上記課題を解決するための手段及びその作用効果について記載する。
上記課題を解決する二重管の接合方法は、アルミニウム合金製の外管及び内管からなる二重管を備える熱交換器に適用される。この熱交換器は、上記内管と上記外管との間を流れる流体と同内管の内部を流れる流体との間での熱交換を行うものである。上記接合方法では、そうした熱交換器における上記外管と上記内管とをろう付によって接合する。詳しくは、外管と内管とのうちの少なくとも一方には、もう一方に向けて前記外管及び前記内管の径方向に突出する凸部を形成する。そして、その凸部で上記外管と上記内管とのろう付を行う。 Means for solving the above problems and their effects will be described below.
A double pipe joining method for solving the above problems is applied to a heat exchanger provided with a double pipe consisting of an outer pipe and an inner pipe made of an aluminum alloy. This heat exchanger exchanges heat between a fluid flowing between the inner tube and the outer tube and a fluid flowing inside the inner tube. In the joining method, the outer tube and the inner tube in such a heat exchanger are joined by brazing. Specifically, at least one of the outer tube and the inner tube is formed with a projection projecting toward the other in the radial direction of the outer tube and the inner tube. Then, the brazing of the outer pipe and the inner pipe is performed by the projection.

この方法によれば、凸部が外管と内管との少なくとも一方に形成される。そして、外管の内部に内管を位置させることによって上記凸部が外管と内管との少なくとも一方からもう一方に向けて突出した状態となり、その凸部において外管と内管とのろう付による接合が行われるため、そうした接合に手間がかかることはない。従って、手間をかけることなく外管と内管とをろう付によって接合することができるようになる。 According to this method, the protrusion is formed on at least one of the outer tube and the inner tube. By positioning the inner tube inside the outer tube, the protrusion protrudes from at least one of the outer tube and the inner tube toward the other. Since the joining is performed by attaching, such joining does not require much labor. Therefore, the outer tube and the inner tube can be joined by brazing without taking much time.

上記熱交換器における二重管の接合方法において、上記凸部は、外管及び内管の長手方向に延びるように形成されるものとし、外管と内管とのろう付は、上記凸部において、その凸部の延びる方向に連続的に行われるものとすることが考えられる。 In the above-described method for joining double tubes in a heat exchanger, the protrusions are formed to extend in the longitudinal direction of the outer tube and the inner tube, and the outer tube and the inner tube are brazed by the protrusions. , it is conceivable that it is performed continuously in the direction in which the convex portion extends.

この方法によれば、外管と内管とのろう付による接合が凸部の延びる方向（外管及び内管の長手方向）に沿って連続的に行われるため、その接合の強度を高めて外管と内管との二重管を強固なものとすることができる。 According to this method, the joining of the outer tube and the inner tube by brazing is performed continuously along the direction in which the projection extends (longitudinal direction of the outer tube and the inner tube). A double tube consisting of an outer tube and an inner tube can be made strong.

上記熱交換器における二重管の接合方法において、上記凸部は、外管及び内管の長手方向に延びるように形成されるものとし、外管と内管とのろう付は、上記凸部において、その凸部の延びる方向に断続的に行われるものとすることも考えられる。 In the above-described method for joining double tubes in a heat exchanger, the protrusions are formed to extend in the longitudinal direction of the outer tube and the inner tube, and the outer tube and the inner tube are brazed by the protrusions. , it is also conceivable to perform intermittently in the direction in which the convex portion extends.

この方法によれば、外管と内管とのろう付による接合が凸部の延びる方向（外管及び内管の長手方向）に沿って断続的に行われるため、凸部における上記ろう付による接合が行われていない部分を流体が通過可能となる。その結果、外管と内管との間における周方向についての流体の流動性が高くなり、その流体と内管の内部を流れる流体との熱交換が効果的に行われるようになる。 According to this method, the joining of the outer tube and the inner tube by brazing is performed intermittently along the direction in which the protrusions extend (longitudinal direction of the outer tube and the inner tube). A fluid can pass through the portion where bonding is not performed. As a result, fluidity of the fluid in the circumferential direction between the outer tube and the inner tube is increased, and heat exchange between the fluid and the fluid flowing inside the inner tube is effectively performed.

なお、上記凸部は、外管及び内管の周方向に間隔をおいて複数形成されるものとし、外管と内管とのろう付は、複数の上記凸部のうちの少なくとも一つで行われるものとするようにしてもよい。 It should be noted that a plurality of protrusions are formed at intervals in the circumferential direction of the outer tube and the inner tube, and the outer tube and the inner tube are brazed by at least one of the plurality of protrusions. It may be assumed that it is performed.

熱交換器における二重管の構造を示す断面図。Sectional drawing which shows the structure of the double tube in a heat exchanger. 図１の二重管を矢印Ａ－Ａ方向から見た状態を示す断面図。FIG. 2 is a cross-sectional view showing the double tube of FIG. 1 as seen from the direction of arrow AA. 内管及び外管における凸部周りを拡大して示す断面図。Sectional drawing which expands and shows the circumference|surroundings of the convex part in an inner pipe|tube and an outer pipe|tube. 内管及び外管における凸部周りの構造の他の例を示す断面図。Sectional drawing which shows the other example of the structure around the convex part in an inner pipe|tube and an outer pipe|tube.

以下、熱交換器における二重管の接合方法の一実施形態について、図１及び図２を参照して説明する。
自動車等の車両においては、車室内の冷暖房といった空調を行うために冷凍サイクルが用いられている。こうした冷凍サイクルでは車室内の冷暖房（冷却や加熱）を行うための冷媒（流体）が循環回路を循環しており、同循環回路中には高温高圧の冷媒と低温低圧の冷媒との間で熱交換を行うための熱交換器が設けられる。 An embodiment of a method for joining double tubes in a heat exchanger will be described below with reference to FIGS. 1 and 2. FIG.
2. Description of the Related Art In vehicles such as automobiles, a refrigeration cycle is used to perform air conditioning such as heating and cooling of the interior of the vehicle. In such a refrigeration cycle, the refrigerant (fluid) for heating and cooling (cooling and heating) the vehicle interior circulates in a circulation circuit. A heat exchanger is provided for effecting the exchange.

上記熱交換器は、図１に示すように、アルミニウム合金製の外管１及び内管２からなる二重管を備えており、外管１と内管２との間を流れる冷媒と内管２の内部を流れる冷媒との間での熱交換を行う。熱交換器の二重管における外管１と内管２とは、ろう付によって互いに接合されている。こうした外管１と内管２とのろう付による接合は、次のように行われる。すなわち、図２に示すように、内管２にその外周から外管１側に向けて径方向に突出する凸部３を形成し、同凸部３で外管１と内管２とのろう付を行う。 The heat exchanger, as shown in FIG. 2 to exchange heat with the refrigerant flowing inside. The outer tube 1 and the inner tube 2 of the double tube of the heat exchanger are joined together by brazing. The joining of the outer tube 1 and the inner tube 2 by brazing is performed as follows. That is, as shown in FIG. 2, the inner tube 2 is formed with a protrusion 3 protruding radially from the outer periphery toward the outer tube 1 side, and the protrusion 3 joins the outer tube 1 and the inner tube 2 together. attach.

次に、上記凸部３について詳しく説明する。
凸部３は、外管１及び内管２の長手方向（図１の左右方向）に延びるように形成される。より詳しくは、凸部３は、外管１及び内管２の中心線周りに螺旋状にねじれるように形成される。更に、凸部３は、図２に示すように、外管１及び内管２の周方向に等間隔をおいて複数（この例では三つ）形成される。このため、内管２の外周には、凸部３による山部と隣合う凸部３同士の間の谷部とが、内管２の周方向において交互に形成されることとなる。 Next, the convex portion 3 will be described in detail.
The convex portion 3 is formed so as to extend in the longitudinal direction of the outer tube 1 and the inner tube 2 (horizontal direction in FIG. 1). More specifically, the convex portion 3 is formed so as to be spirally twisted around the center line of the outer tube 1 and the inner tube 2 . Furthermore, as shown in FIG. 2, a plurality of (three in this example) projections 3 are formed at equal intervals in the circumferential direction of the outer tube 1 and the inner tube 2 . Therefore, on the outer periphery of the inner tube 2, peaks formed by the protrusions 3 and valleys between the adjacent protrusions 3 are alternately formed in the circumferential direction of the inner tube 2. As shown in FIG.

内管２における凸部３の形成については、例えば次のような方法によって行うことができる。アルミニウム合金を押出加工によって円筒状にした管材を内管２を形成するための素材とし、上記管材（内管２の素材）に対するロール等を用いた転造加工を通じて、もしくはプレス加工を通じて上記凸部３を形成する。ちなみに、上記アルミニウム合金としては、加工性及びろう付性に優れる１０００系または３０００系のアルミニウム合金を用いることが好ましい。 Formation of the protrusions 3 on the inner tube 2 can be performed, for example, by the following method. A tube material made by extruding an aluminum alloy into a cylindrical shape is used as a material for forming the inner tube 2, and the convex portion is formed by rolling the tube material (material of the inner tube 2) using a roll or the like, or by press working. 3 is formed. Incidentally, as the aluminum alloy, it is preferable to use a 1000-series or 3000-series aluminum alloy which is excellent in workability and brazeability.

なお、外管１についても、内管２と同様のアルミニウム合金を押出加工によって円筒状にした管材が、同外管１を形成するための素材として用いられる。外管１と内管２とのろう付は、上記凸部３において、その凸部３の延びる方向に連続的に、あるいは断続的に行われる。また、外管１と内管２とのろう付は、複数の凸部３のうちの少なくとも一つで行われればよく、複数の凸部３すべてで行ったり、一つあるいは二つで行ったりすることが考えられる。 For the outer tube 1 as well, a tube material formed by extruding an aluminum alloy similar to that of the inner tube 2 into a cylindrical shape is used as a material for forming the outer tube 1 . The brazing of the outer tube 1 and the inner tube 2 is performed at the projections 3 continuously or intermittently in the extending direction of the projections 3 . In addition, the brazing of the outer tube 1 and the inner tube 2 may be performed at least one of the plurality of protrusions 3, and may be performed at all of the plurality of protrusions 3, or may be performed at one or two. can be considered.

次に、上記凸部３での外管１と内管２とのろう付について詳しく説明する。
外管１と内管２とをろう付する際には、外管１の内周が内管２における凸部３の外周よりも大径となるよう外管１を形成しておき、内管２における凸部３の外周にろう材粉末及びフラックス粉末を含有するろう付組成物を塗布する。なお、図３は、内管２及び外管１における凸部３周りを拡大して示したものであり、その凸部３の外周にはろう材４（ろう付組成物）が配置されている。詳しくは、凸部３の外周には内管２に向かって突出する突起３ａが形成されており、その突起３ａにおける図３の幅方向両側及び凸部３の外周における上記突起３ａと繋がる部分に上記ろう材４が配置されている。 Next, the brazing of the outer tube 1 and the inner tube 2 at the convex portion 3 will be described in detail.
When brazing the outer tube 1 and the inner tube 2, the outer tube 1 is formed so that the inner circumference of the outer tube 1 has a larger diameter than the outer circumference of the convex portion 3 of the inner tube 2. A brazing composition containing brazing material powder and flux powder is applied to the outer periphery of the convex portion 3 in 2 . FIG. 3 is an enlarged view of the protrusions 3 and their surroundings in the inner tube 2 and the outer tube 1, and the brazing material 4 (brazing composition) is arranged around the protrusions 3. . More specifically, projections 3a projecting toward the inner tube 2 are formed on the outer circumference of the convex portion 3, and portions of the projections 3a connected to the projections 3a on both sides in the width direction of FIG. The brazing material 4 is arranged.

外管１と内管２とのろう付を凸部３において同凸部３の延びる方向に連続的に行う場合、凸部３の外周に対し上記ろう付組成物を同凸部３の延びる方向に連続的に塗布する。このときのろう付組成物の塗布の方法としては、例えばロール転写やブラシによる塗布があげられる。 When the brazing of the outer tube 1 and the inner tube 2 is continuously performed at the projections 3 in the direction in which the projections 3 extend, the brazing composition is applied to the outer periphery of the projections 3 in the direction in which the projections 3 extend. Apply continuously to Examples of the method of applying the brazing composition at this time include roll transfer and brush application.

また、外管１と内管２とのろう付を凸部３において同凸部３の延びる方向に断続的に行う場合、凸部３の外周に対し上記ろう付組成物を同凸部３の延びる方向に断続的に塗布する。このときのろう付組成物の塗布の方法としては、例えば上記ロール転写において凹凸が付与されたロールを用いることで同ロールの凸部のろう付組成物を凸部３の外周に塗布する方法があげられる。また、凹凸が付与された上記ロールに代えて、通常のロールを用いる場合であっても、その通常のロール上のろう付組成物を断続的に除去すれば、凸部３の外周に断続的にろう付組成物を塗布することが可能である。 Further, when the outer pipe 1 and the inner pipe 2 are brazed intermittently in the direction in which the convex portion 3 extends, the brazing composition is applied to the outer periphery of the convex portion 3. Apply intermittently in the direction of extension. As a method of applying the brazing composition at this time, for example, there is a method of applying the brazing composition on the convex portions of the roll to the outer periphery of the convex portions 3 by using a roll having concavo-convex portions in the roll transfer. can give. In addition, even if a normal roll is used instead of the above-described uneven roll, if the brazing composition on the normal roll is intermittently removed, intermittent It is possible to apply the brazing composition to the

凸部３に対しろう付組成物が塗布された内管２は外管１内に挿入される。そして、その状態のもとで外管１を縮径するための引き抜き加工を行うことにより、外管１の内径が引き抜き加工前の内管２における凸部３での外径よりも小さくなるようにし、内管２における凸部３の外周と外管１の内周とを接触させる。言い換えれば、引き抜き加工後の外管１の内径が、引き抜き加工前の内管２の外径（内管２の凸部３が形成されている部分の外径）よりも、小さくなるようにする。 The inner tube 2 with the brazing composition applied to the projections 3 is inserted into the outer tube 1 . Under this condition, the outer tube 1 is subjected to a drawing process to reduce its diameter, so that the inner diameter of the outer tube 1 becomes smaller than the outer diameter of the convex portion 3 of the inner tube 2 before the drawing process. Then, the outer circumference of the convex portion 3 of the inner tube 2 and the inner circumference of the outer tube 1 are brought into contact with each other. In other words, the inner diameter of the outer tube 1 after drawing is made smaller than the outer diameter of the inner tube 2 before drawing (the outer diameter of the portion of the inner tube 2 where the protrusions 3 are formed). .

その後、外管１及び内管２を不活性ガス（例えば純窒素ガス）が充填された炉内に入れ、その炉内の不活性ガス雰囲気中で外管１及び内管２に対しろう付加熱を行う。詳しくは、炉内の温度を上記ろう付組成物の溶融温度よりも高い温度にて所定時間保持する。上記炉内の温度としては例えば６００～６０５℃とすることが好ましく、その温度を保持する時間としては例えば３～５分が好ましい。このように炉内の外管１及び内管２に対しろう付加熱を行うことにより、外管１と内管２とが上記ろう付組成物を通じて凸部３で接合される。 After that, the outer tube 1 and the inner tube 2 are placed in a furnace filled with an inert gas (for example, pure nitrogen gas), and the outer tube 1 and the inner tube 2 are brazed in the inert gas atmosphere in the furnace. I do. Specifically, the temperature in the furnace is maintained at a temperature higher than the melting temperature of the brazing composition for a predetermined period of time. The temperature in the furnace is preferably, for example, 600 to 605° C., and the time for which the temperature is maintained is preferably, for example, 3 to 5 minutes. By applying brazing heat to the outer tube 1 and the inner tube 2 in the furnace in this manner, the outer tube 1 and the inner tube 2 are joined at the convex portions 3 through the brazing composition.

なお、製品としての熱交換器の二重管に曲げが必要な場合には、上述した引き抜き加工後であって上記ろう付加熱前に、外管１及び内管２に対し曲げ加工を施すことが好ましい。これは、ろう付によって外管１と内管２とを接合する場合、その接合が強固であるために二重管に対する曲げ加工が行いにくくなるためである。 If the double tube of the heat exchanger as a product needs to be bent, the outer tube 1 and the inner tube 2 should be bent after the drawing process described above and before the brazing heating. is preferred. This is because when the outer tube 1 and the inner tube 2 are joined by brazing, the joint is so strong that it is difficult to bend the double tube.

上記ろう付組成物に含有されるろう材粉末としては、シリコン（Ｓｉ）の単体粉末を用いたり、アルミニウム（Ａｌ）とシリコンとの合成粉末を用いたりすることができる。また、Ａ４０４５やＡ４０４７等のＪＩＳやＡＡ規格に規定されるろう材用ＡｌーＳｉ合金粉末を上記ろう材粉末として用いることも可能である。上記ろう付組成物に含有されるフラックス粉末は、通常のアルミニウム合金のろう付に用いられるフッ化物系フラックス粉末でよい。 As the brazing filler metal powder contained in the above brazing composition, silicon (Si) single powder or synthetic powder of aluminum (Al) and silicon can be used. Al--Si alloy powders for brazing materials such as A4045 and A4047, which are defined in JIS and AA standards, can also be used as the brazing material powders. The flux powder contained in the above brazing composition may be a fluoride-based flux powder that is commonly used for brazing aluminum alloys.

なお、上記ろう付組成物を凸部３に塗布した後、そのろう付組成物が脱落してしまうような場合には、必要に応じてろう付組成物にバインダを含有させることも可能である。このバインダとしては、メタクリル酸重合体等のアクリル樹脂、ウレタン樹脂など、ろう付加熱による昇温中に分解、揮発するものが好ましい。 In addition, if the brazing composition falls off after the brazing composition is applied to the protrusions 3, the brazing composition may contain a binder as necessary. . As the binder, it is preferable to use acrylic resin such as methacrylic acid polymer, urethane resin, or the like, which decomposes and volatilizes during temperature rise due to brazing addition heat.

上記ろう付組成物の成分比率としては、ろう付組成物全体の重量に対し、ろう材粉末の重量が例えば１０％～４５％の範囲、フラックス粉末の重量が例えば３０％～８０％の範囲、バインダの重量が例えば１０％～４０％の範囲となるようにすることが好ましい。なお、ろう材粉末としてＳｉ粉末を用いる場合、ろう付組成物全体に対するろう材粉末の比率を、ろう付組成物全体に対するフラックス粉末の比率よりも少なくすることが好ましい。また、ろう材粉末としてＡｌ－Ｓｉ合金粉末を用いる場合には、ろう付組成物全体に対するろう材粉末の比率が、ろう付組成物全体に対するフラックス粉末の比率よりも多くてもよい。 As for the component ratio of the brazing composition, the weight of the brazing material powder is in the range of, for example, 10% to 45%, and the weight of the flux powder is in the range of, for example, 30% to 80%, based on the weight of the entire brazing composition. Preferably, the weight of the binder is in the range of 10% to 40%, for example. When Si powder is used as the brazing powder, the ratio of the brazing powder to the entire brazing composition is preferably lower than the ratio of the flux powder to the entire brazing composition. Further, when Al—Si alloy powder is used as the brazing powder, the ratio of the brazing powder to the entire brazing composition may be higher than the ratio of the flux powder to the entire brazing composition.

次に、本実施形態の熱交換器における二重管の接合方法の作用効果について説明する。
（１）内管２に凸部３を形成し、その内管２を外管１内に挿入して凸部３の外面を外管１の内周に接触させた状態で、同凸部３において外管１と内管２とのろう付による接合が行われるため、そうした接合に手間がかかることはない。従って、手間をかけることなく外管１と内管２とをろう付によって接合することができる。 Next, the effects of the method for joining the double pipes in the heat exchanger of this embodiment will be described.
(1) The inner tube 2 is formed with the projections 3, the inner tube 2 is inserted into the outer tube 1, and the outer surface of the projections 3 is brought into contact with the inner periphery of the outer tube 1. Since the outer tube 1 and the inner tube 2 are joined by brazing in , such joining does not take much time. Therefore, the outer tube 1 and the inner tube 2 can be joined by brazing without taking much time.

（２）外管１と内管２とのろう付による接合を凸部３の延びる方向（外管１及び内管２の長手方向）に沿って連続的に行うことにより、その接合の強度を高めて外管１と内管２との二重管を強固なものとすることができる。 (2) The strength of the joint is increased by continuously brazing the outer tube 1 and the inner tube 2 along the extending direction of the projections 3 (longitudinal direction of the outer tube 1 and the inner tube 2). By increasing the thickness, the double tube of the outer tube 1 and the inner tube 2 can be strengthened.

（３）外管１と内管２とのろう付による接合を凸部３の延びる方向に沿って断続的に行うことにより、凸部３の外周における上記ろう付による接合が行われていない部分を冷媒が通過可能となる。その結果、外管１と内管２との間における周方向についての冷媒の流動性が高くなり、その冷媒と内管２の内部を流れる冷媒との熱交換が効果的に行われるようになる。 (3) By intermittently joining the outer pipe 1 and the inner pipe 2 by brazing along the direction in which the convex portion 3 extends, a portion of the outer periphery of the convex portion 3 where the brazing is not performed. Refrigerant can pass through. As a result, the fluidity of the refrigerant in the circumferential direction between the outer tube 1 and the inner tube 2 is increased, and heat exchange between the refrigerant and the refrigerant flowing inside the inner tube 2 is effectively performed. .

なお、上記実施形態は、例えば以下のように変更することもできる。
・凸部３は外管１及び内管２の長手方向に直線状に延びていてもよい。
・凸部３の数については適宜変更してもよい。 It should be noted that the above embodiment can be modified, for example, as follows.
- The convex portion 3 may extend linearly in the longitudinal direction of the outer tube 1 and the inner tube 2 .
- The number of protrusions 3 may be changed as appropriate.

・凸部３の数を四つ以上とする場合、凸部３での外管１と内管２とのろう付を内管２の周方向において一つおきに行うようにしてもよい。
・ろう付加熱については、炉内を真空状態とし、その真空中で行うようにすることも可能である。 - When the number of protrusions 3 is four or more, the brazing of the outer tube 1 and the inner tube 2 at the protrusions 3 may be performed alternately in the circumferential direction of the inner tube 2 .
・It is also possible to evacuate the inside of the furnace and carry out the brazing heat in that vacuum.

・内管２にその外周から外管１側に向けて径方向に突出する凸部３を形成し、同凸部３で外管１と内管２とのろう付を行うようにしたが、上記凸部３に代えて、もしくは上記凸部３に加えて、図４に示すように外管１にその内周から内管２側に向けて径方向に突出する凸部５を形成し、同凸部５で外管１と内管２とのろう付を行うようにしてもよい。この場合、凸部５の内周にろう材４（ろう付組成物）が配置される。詳しくは、凸部５の内周に外管１に向かって突出する突起５ａが形成され、その突起５ａにおける図４の幅方向両側及び凸部５の内周における上記突起５ａと繋がる部分に上記ろう材４が配置される。 - The inner pipe 2 is formed with a convex portion 3 projecting radially from the outer circumference toward the outer pipe 1 side, and the outer pipe 1 and the inner pipe 2 are brazed by the convex portion 3. Instead of or in addition to the projections 3, as shown in FIG. The brazing of the outer tube 1 and the inner tube 2 may be performed at the convex portion 5 . In this case, the brazing material 4 (brazing composition) is arranged on the inner circumference of the convex portion 5 . More specifically, projections 5a projecting toward the outer tube 1 are formed on the inner periphery of the convex portion 5, and portions of the projections 5a on both sides in the width direction of FIG. Brazing material 4 is placed.

ちなみに、内管２に凸部３を形成し、且つ外管１にも凸部５を形成する場合、内管２の凸部３及び外管１の凸部５の位置は周方向において一致していてもよいし、ずれていてもよい。内管２の凸部３及び外管１の凸部５の位置を周方向においてずらした場合、そのように凸部３と凸部５との周方向の位置がずれた状態のもとで、凸部３の外周が外管１に対しろう付されるとともに、凸部５の内周が内管２に対しろう付される。また、内管２の凸部３及び外管１の凸部５の位置を周方向において一致させる場合、内管２の凸部３と外管１の凸部５とが付き合わされた状態のもと、内管２の凸部３及び外管１の凸部５で外管１と内管２とのろう付が行われる。 Incidentally, when the projections 3 are formed on the inner tube 2 and the projections 5 are also formed on the outer tube 1, the positions of the projections 3 of the inner tube 2 and the projections 5 of the outer tube 1 coincide in the circumferential direction. It may be the same, or it may be off. When the positions of the projections 3 of the inner tube 2 and the projections 5 of the outer tube 1 are shifted in the circumferential direction, under such a state in which the positions of the projections 3 and 5 are shifted in the circumferential direction, The outer periphery of the protrusion 3 is brazed to the outer tube 1 and the inner periphery of the protrusion 5 is brazed to the inner tube 2 . In addition, when the positions of the projections 3 of the inner tube 2 and the projections 5 of the outer tube 1 are aligned in the circumferential direction, the projections 3 of the inner tube 2 and the projections 5 of the outer tube 1 are aligned. Then, the brazing of the outer tube 1 and the inner tube 2 is performed at the protrusions 3 of the inner tube 2 and the protrusions 5 of the outer tube 1 .

１…外管、２…内管、３…凸部、３ａ…突起、４…ろう材、５…凸部、５ａ…突起。 DESCRIPTION OF SYMBOLS 1... Outer pipe|tube, 2... Inner pipe|tube, 3... Convex part, 3a... Protrusion, 4... Brazing material, 5... Convex part, 5a... Protrusion.

Claims (4)

アルミニウム合金製の外管及び内管からなる二重管を備えており、前記内管と前記外管との間を流れる流体と前記内管の内部を流れる流体との間での熱交換を行う熱交換器に適用され、前記外管と前記内管とをろう付によって接合するようにした熱交換器における二重管の接合方法であって、
前記外管と前記内管とのうちの少なくとも一方には、もう一方に向けて前記外管及び前記内管の径方向に突出する凸部を、前記外管及び前記内管の長手方向に延びるように、且つ前記外管及び前記内管の中心線周りに螺旋状にねじれるように、厚さ方向についての屈曲を通じて形成し、その凸部に形成された突起の幅方向両側及び前記凸部における前記突起と繋がる部分にろう材粉末を含むろう付組成物を塗布することによって前記ろう付組成物をろう材として配置し、そのろう材を用いて前記凸部での前記外管と前記内管との前記ろう付を行うようにしたことを特徴とする熱交換器における二重管の接合方法。 It has a double tube consisting of an aluminum alloy outer tube and an inner tube, and performs heat exchange between the fluid flowing between the inner tube and the outer tube and the fluid flowing inside the inner tube. A method for joining double tubes in a heat exchanger, wherein the outer tube and the inner tube are joined by brazing, the method being applied to a heat exchanger, comprising:
At least one of the outer tube and the inner tube has a projection projecting toward the other in the radial direction of the outer tube and the inner tube and extending in the longitudinal direction of the outer tube and the inner tube. and formed through bending in the thickness direction so as to be helically twisted around the center line of the outer tube and the inner tube, and both sides of the protrusion formed on the protrusion in the width direction and at the protrusion By applying a brazing composition containing a brazing powder to the portion connected to the projection, the brazing composition is arranged as a brazing material, and the outer tube and the inner tube at the protrusion are used with the brazing material. A method for joining double tubes in a heat exchanger, characterized in that the brazing is performed with. 前記外管と前記内管とのろう付は、前記凸部において、その凸部の延びる方向に連続的に行われる請求項１に記載の熱交換器における二重管の接合方法。 2. The method for joining double tubes in a heat exchanger according to claim 1, wherein the brazing of the outer tube and the inner tube is continuously performed at the projection in the extending direction of the projection. 前記外管と前記内管とのろう付は、前記凸部において、その凸部の延びる方向に断続的に行われる請求項１に記載の熱交換器における二重管の接合方法。 2. The method for joining double tubes in a heat exchanger according to claim 1, wherein the brazing of the outer tube and the inner tube is intermittently performed at the projection in the extending direction of the projection. 前記凸部は、前記外管及び前記内管の周方向に間隔をおいて複数形成され、
前記外管と前記内管とのろう付は、複数の前記凸部のうちの少なくとも一つで行われる請求項１～３のいずれか一項に記載の熱交換器における二重管の接合方法。 A plurality of the protrusions are formed at intervals in the circumferential direction of the outer tube and the inner tube,
The method for joining double tubes in a heat exchanger according to any one of claims 1 to 3, wherein the brazing of the outer tube and the inner tube is performed at least one of the plurality of protrusions. .
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050150640A1 (en) 2004-01-09 2005-07-14 Ranga Nadig Double-tube apparatus for use in a heat exchanger and method of using the same
JP2008032296A (en) 2006-07-27 2008-02-14 Teigu:Kk Heat exchanger
JP2009162395A (en) 2007-12-28 2009-07-23 Showa Denko Kk Double-wall-tube heat exchanger
DE102011008119A1 (en) 2011-01-07 2012-07-12 Arup Alu-Rohr Und -Profil Gmbh Double pipe for double pipe heat exchanger for motor vehicle engine, has recesses and projections that are formed in outer pipe wall and inner pipe wall respectively and are radially inserted into annular gap
US20120279691A1 (en) 2011-05-06 2012-11-08 GM Global Technology Operations LLC Heat exchanger for a motor vehicle air conditioning system
US20150224561A1 (en) 2010-08-18 2015-08-13 Halla Visteon Climate Control Corp. Double pipe type heat exchanger and method for manufacturing the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1038491A (en) * 1996-07-23 1998-02-13 Toyo Radiator Co Ltd Double tube type heat exchanger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050150640A1 (en) 2004-01-09 2005-07-14 Ranga Nadig Double-tube apparatus for use in a heat exchanger and method of using the same
JP2008032296A (en) 2006-07-27 2008-02-14 Teigu:Kk Heat exchanger
JP2009162395A (en) 2007-12-28 2009-07-23 Showa Denko Kk Double-wall-tube heat exchanger
US20150224561A1 (en) 2010-08-18 2015-08-13 Halla Visteon Climate Control Corp. Double pipe type heat exchanger and method for manufacturing the same
DE102011008119A1 (en) 2011-01-07 2012-07-12 Arup Alu-Rohr Und -Profil Gmbh Double pipe for double pipe heat exchanger for motor vehicle engine, has recesses and projections that are formed in outer pipe wall and inner pipe wall respectively and are radially inserted into annular gap
US20120279691A1 (en) 2011-05-06 2012-11-08 GM Global Technology Operations LLC Heat exchanger for a motor vehicle air conditioning system

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