JP2019215123A - Method for jointing double pipe in heat exchanger - Google Patents
Method for jointing double pipe in heat exchanger Download PDFInfo
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- JP2019215123A JP2019215123A JP2018112133A JP2018112133A JP2019215123A JP 2019215123 A JP2019215123 A JP 2019215123A JP 2018112133 A JP2018112133 A JP 2018112133A JP 2018112133 A JP2018112133 A JP 2018112133A JP 2019215123 A JP2019215123 A JP 2019215123A
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- tube
- brazing
- convex portion
- inner tube
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005219 brazing Methods 0.000 claims abstract description 74
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 13
- 239000003507 refrigerant Substances 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 description 24
- 239000000843 powder Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 15
- 230000004907 flux Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
Classifications
-
- 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
Landscapes
- 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)
Abstract
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 vehicles such as automobiles, a fluid for cooling or heating a predetermined portion of the vehicle circulates in a circulation circuit, and a heat exchanger for exchanging heat between the fluids is provided in such a circulation circuit. There are cases. The heat exchanger includes a double pipe composed of an outer pipe and an inner pipe made of an aluminum alloy. Between the fluid flowing between the inner pipe and the outer pipe and the fluid flowing inside the inner pipe. It is known that heat exchange is performed.
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。 Further, as described above, in a heat exchanger including a double pipe, as shown in Patent Document 1, an annular inner fin having a plurality of irregularities arranged in a circumferential direction is inserted between the outer pipe and the inner pipe. It has been proposed to braze the inner fin to the inner periphery of the outer tube and the outer periphery of the inner tube. In this case, since the outer tube and the inner tube of the heat exchanger are joined to each other by brazing via the inner fin, the double tube composed of the outer tube and the inner tube of the heat exchanger may be strengthened. it 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.
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 via the inner fin as shown in Patent Document 1, the inner fin is inserted between the outer tube and the inner tube, and the inner fin is further connected to the outer tube. It is necessary to braze the inner periphery of the inner tube and the outer periphery of the inner tube, and it is undeniable that it takes time 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。 An object of the present invention is to provide a method for joining double tubes in a heat exchanger that can join an outer tube and an inner tube by brazing without any trouble.
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。
Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The double pipe joining method for solving the above problem is applied to a heat exchanger including a double pipe made of an aluminum alloy outer pipe and an inner pipe. This heat exchanger performs heat exchange 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 convex portion protruding in the radial direction of the outer tube and the inner tube toward the other. Then, the outer tube and the inner tube are brazed with the convex portion.
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 convex portion is formed on at least one of the outer tube and the inner tube. Then, by positioning the inner tube inside the outer tube, the convex portion protrudes from at least one of the outer tube and the inner tube toward the other, and the outer tube and the inner tube are joined at the convex portion. Since joining is performed by attaching, such joining does not take time. Therefore, the outer tube and the inner tube can be joined by brazing without taking time and effort.
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 method for joining double tubes in the heat exchanger, the convex portion is formed so as to extend in a longitudinal direction of the outer tube and the inner tube. It is conceivable that the process 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, since the joining of the outer tube and the inner tube by brazing is performed continuously along the direction in which the convex portion extends (the longitudinal direction of the outer tube and the inner tube), the strength of the joining is increased. The double pipe of the outer pipe and the inner pipe 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 method for joining double tubes in the heat exchanger, the convex portion is formed so as to extend in a longitudinal direction of the outer tube and the inner tube. It is also conceivable that the process is performed 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, since the joining of the outer tube and the inner tube by brazing is performed intermittently along the direction in which the protruding portion extends (the longitudinal direction of the outer tube and the inner tube), the brazing at the protruding portion is performed by the brazing. The fluid can pass through the part where the joining is not performed. As a result, the 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。 In addition, the said convex part shall be formed in multiple numbers at intervals in the circumferential direction of the outer pipe and the inner pipe, and the brazing of the outer pipe and the inner pipe is performed by at least one of the plural convex parts. It may be performed.
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。
Hereinafter, an embodiment of a double pipe joining method in a heat exchanger will be described with reference to FIGS. 1 and 2.
In vehicles such as automobiles, a refrigeration cycle is used for air conditioning such as cooling and heating in the passenger compartment. In such a refrigeration cycle, a refrigerant (fluid) for cooling and heating (cooling and heating) in the passenger compartment circulates in the circulation circuit, and heat is generated between the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant in the circulation circuit. A heat exchanger is provided for performing 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。 As shown in FIG. 1, the heat exchanger includes a double pipe composed of an outer pipe 1 and an inner pipe 2 made of an aluminum alloy, and a refrigerant flowing between the outer pipe 1 and the inner pipe 2 and an inner pipe. 2 to perform heat exchange with the refrigerant flowing through the inside of the fuel cell 2. The outer tube 1 and the inner tube 2 in the double tube of the heat exchanger are joined to each other by brazing. Such 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 convex portion 3 projecting radially from the outer periphery toward the outer tube 1 side, and the outer tube 1 and the inner tube 2 are joined by the convex portion 3. Append.
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 part 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 (left-right 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 (three in this example) of convex portions 3 are formed at equal intervals in the circumferential direction of the outer tube 1 and the inner tube 2. For this reason, on the outer periphery of the inner tube 2, the ridges formed by the protrusions 3 and the valleys between the adjacent protrusions 3 are alternately formed in the circumferential direction of the inner tube 2.
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。 The formation of the projections 3 in the inner tube 2 can be performed, for example, by the following method. A tube material made of aluminum alloy by extrusion is used as a material for forming the inner tube 2, and the convex portion is formed through a rolling process using a roll or the like on the tube material (the material of the inner tube 2) or through a press process. 3 is formed. Incidentally, as the aluminum alloy, it is preferable to use a 1000 series or 3000 series aluminum alloy that is excellent in workability and brazing.
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。 In addition, as for the outer tube 1, a tube material obtained by extruding the same aluminum alloy as the inner tube 2 by extrusion is used as a material for forming the outer tube 1. The outer tube 1 and the inner tube 2 are brazed continuously or intermittently in the protruding portion 3 in the direction in which the protruding portion 3 extends. Also, the brazing between the outer tube 1 and the inner tube 2 may be performed by at least one of the plurality of convex portions 3, and may be performed by all of the plurality of convex portions 3, or by one or two. It is possible to do.
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, brazing of the outer tube 1 and the inner tube 2 at the convex portion 3 will be described in detail.
When the outer tube 1 and the inner tube 2 are brazed, the outer tube 1 is formed so that the inner circumference of the outer tube 1 is larger than the outer circumference of the convex portion 3 of the inner tube 2. A brazing composition containing a brazing filler metal powder and a flux powder is applied to the outer periphery of the convex portion 3 in FIG. FIG. 3 is an enlarged view of the periphery of the convex portion 3 in the inner tube 2 and the outer tube 1, and a brazing material 4 (brazing composition) is disposed on the outer periphery of the convex portion 3. . Specifically, protrusions 3a projecting toward the inner tube 2 are formed on the outer periphery of the protrusion 3, and the protrusions 3a are connected to the protrusions 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 brazing the outer tube 1 and the inner tube 2 is performed continuously in the direction in which the convex portion 3 extends in the convex portion 3, the brazing composition is applied to the outer periphery of the convex portion 3 in the direction in which the convex portion 3 extends. Is applied continuously. Examples of the method for applying the brazing composition at this time include roll transfer and application with a brush.
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。 When the outer tube 1 and the inner tube 2 are intermittently brazed in the direction in which the convex portion 3 extends in the convex portion 3, 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 of the convex portion of the roll to the outer periphery of the convex portion 3 by using a roll provided with irregularities in the roll transfer. can give. Moreover, even if it is a case where a normal roll is used instead of the said roll provided with the unevenness | corrugation, if the brazing composition on the normal roll is removed intermittently, it will intermittently be on the outer periphery of the convex part 3. It is possible to apply a brazing composition.
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 in which the brazing composition has been applied to the projections 3 is inserted into the outer tube 1. Then, by performing a drawing process for reducing the diameter of the outer tube 1 in that state, the inner diameter of the outer tube 1 is smaller than the outer diameter of the convex portion 3 of the inner tube 2 before the drawing process. Then, the outer periphery of the convex portion 3 of the inner tube 2 is brought into contact with the inner periphery of the outer tube 1. In other words, the inner diameter of the outer pipe 1 after the drawing process is made smaller than the outer diameter of the inner pipe 2 before the drawing process (the outer diameter of the portion where the convex portion 3 of the inner pipe 2 is 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。 Thereafter, 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 heated by an additional heat in an inert gas atmosphere in the furnace. I do. Specifically, the temperature in the furnace is maintained for a predetermined time at a temperature higher than the melting temperature of the brazing composition. The temperature in the furnace is preferably, for example, 600 to 605 ° C., and the time for maintaining the temperature is preferably, for example, 3 to 5 minutes. Thus, by performing brazing additional heat with respect to the outer tube 1 and the inner tube 2 in the furnace, the outer tube 1 and the inner tube 2 are joined to each other at the convex portion 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。 When bending is required for the double pipe of the heat exchanger as a product, bend the outer pipe 1 and the inner pipe 2 after the above-mentioned drawing and before the above-mentioned additional heat of brazing. Is preferred. This is because when the outer tube 1 and the inner tube 2 are joined by brazing, the joining is strong, and therefore 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 brazing composition, a simple powder of silicon (Si) or a synthetic powder of aluminum (Al) and silicon can be used. Moreover, it is also possible to use Al—Si alloy powder for brazing filler metal defined in JIS and AA standards such as A4045 and A4047 as the brazing filler metal powder. The flux powder contained in the brazing composition may be a fluoride-based flux powder used for brazing an ordinary aluminum alloy.
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 the case where the brazing composition falls off after the brazing composition is applied to the projections 3, the brazing composition may include a binder as necessary. . As this binder, an acrylic resin such as a methacrylic acid polymer, a urethane resin, or the like that decomposes and volatilizes during the temperature rise by brazing heat is preferable.
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 the component ratio of the brazing composition, the weight of the brazing powder is, for example, in a range of 10% to 45%, the weight of the flux powder is in a range of, for example, 30% to 80%, based on the weight of the entire brazing composition; It is preferable that the weight of the binder is, for example, in the range of 10% to 40%. In addition, when using Si powder as brazing material powder, it is preferable to make the ratio of the brazing material powder with respect to the whole brazing composition smaller than the ratio of the flux powder with respect to the whole brazing composition. When the Al-Si alloy powder is used as the brazing material powder, the ratio of the brazing material powder to the whole brazing composition may be larger than the ratio of the flux powder to the whole 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 effect of the double pipe joining method in the heat exchanger of the present embodiment will be described.
(1) The convex portion 3 is formed in the inner tube 2, the inner tube 2 is inserted into the outer tube 1, and the outer surface of the convex portion 3 is brought into contact with the inner periphery of the outer tube 1. In this case, since the outer tube 1 and the inner tube 2 are joined by brazing, such joining does not take time. Therefore, the outer tube 1 and the inner tube 2 can be joined by brazing without taking time and effort.
（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) By joining the outer tube 1 and the inner tube 2 by brazing continuously along the direction in which the convex portion 3 extends (the longitudinal direction of the outer tube 1 and the inner tube 2), the joining strength is reduced. It is possible to strengthen the double pipe of the outer pipe 1 and the inner pipe 2 by increasing the height.
（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 joining the outer tube 1 and the inner tube 2 by brazing intermittently along the direction in which the projection 3 extends, a portion of the outer periphery of the projection 3 where the joining by brazing is not performed. Through which the refrigerant can pass. As a result, the fluidity of the refrigerant in the circumferential direction between the outer pipe 1 and the inner pipe 2 increases, and heat exchange between the refrigerant and the refrigerant flowing inside the inner pipe 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。
In addition, the said embodiment can also be changed as follows, for example.
The convex portion 3 may extend linearly in the longitudinal direction of the outer tube 1 and the inner tube 2.
-About the number of the convex parts 3, you may change suitably.
・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 the convex portions 3 is four or more, the outer tube 1 and the inner tube 2 at the convex portion 3 may be brazed every other in the circumferential direction of the inner tube 2.
-About brazing additional heat, it is also possible to make the inside of the furnace in a vacuum state and perform 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 tube 2 is formed with a convex portion 3 projecting radially from the outer periphery toward the outer tube 1 side, and the outer tube 1 and the inner tube 2 are brazed by the convex portion 3. In place of or in addition to the convex portion 3, a convex portion 5 is formed on the outer tube 1 so as to protrude radially from the inner periphery toward the inner tube 2 as shown in FIG. The outer tube 1 and the inner tube 2 may be brazed by the convex portion 5. In this case, the brazing material 4 (brazing composition) is disposed on the inner periphery of the convex portion 5. Specifically, a protrusion 5a protruding toward the outer tube 1 is formed on the inner periphery of the protrusion 5, and the protrusion 5a is connected to the protrusion 5a on both sides in the width direction of FIG. A brazing material 4 is arranged.
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 convex portion 3 is formed on the inner tube 2 and the convex portion 5 is also formed on the outer tube 1, the positions of the convex portion 3 of the inner tube 2 and the convex portion 5 of the outer tube 1 coincide in the circumferential direction. May be shifted or may be shifted. When the positions of the convex portion 3 of the inner tube 2 and the convex portion 5 of the outer tube 1 are shifted in the circumferential direction, under such a state that the circumferential positions of the convex portion 3 and the convex portion 5 are shifted, The outer periphery of the convex portion 3 is brazed to the outer tube 1, and the inner periphery of the convex portion 5 is brazed to the inner tube 2. Moreover, when making the position of the convex part 3 of the inner tube | pipe 2 and the convex part 5 of the outer tube | pipe 1 correspond in the circumferential direction, the state where the convex part 3 of the inner tube | pipe 2 and the convex part 5 of the outer tube | pipe 1 were put together. Then, the outer tube 1 and the inner tube 2 are brazed by the convex portion 3 of the inner tube 2 and the convex portion 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, 2 ... inner pipe, 3 ... convex part, 3a ... projection, 4 ... brazing material, 5 ... convex part, 5a ... projection.
Claims (4)
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形成し、その凸部で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。 A double pipe comprising an outer pipe and an inner pipe made of an aluminum alloy is provided, and heat exchange is performed between a fluid flowing between the inner pipe and the outer pipe and a fluid flowing inside the inner pipe. A method of joining a double pipe in a heat exchanger applied to a heat exchanger, wherein the outer pipe and the inner pipe are joined by brazing,
At least one of the outer tube and the inner tube is formed with a convex portion projecting in the radial direction of the outer tube and the inner tube toward the other, and the convex portion projects the outer tube and the inner tube. A method of joining a double pipe in a heat exchanger, characterized in that the brazing with a pipe is performed.
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。 The convex portion is formed to extend in the longitudinal direction of the outer tube and the inner tube,
The method of joining double pipes in a heat exchanger according to claim 1, wherein the brazing between the outer tube and the inner tube is continuously performed in the protruding portion in a direction in which the protruding portion extends.
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。 The convex portion is formed to extend in the longitudinal direction of the outer tube and the inner tube,
The method for joining double pipes in a heat exchanger according to claim 1, wherein the brazing between the outer pipe and the inner pipe is intermittently performed at the convex portion in a direction in which the convex portion extends.
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 convex portions are formed at intervals in the circumferential direction of the outer tube and the inner tube,
The method of joining a double pipe in a heat exchanger according to any one of claims 1 to 3, wherein the brazing of the outer pipe and the inner pipe is performed on at least one of the plurality of protrusions. .
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| JP2018112133A JP7233857B2 (en) | 2018-06-12 | 2018-06-12 | Double tube joining method in heat exchanger |
| PCT/JP2019/023379 WO2019240204A1 (en) | 2018-06-12 | 2019-06-12 | Method for joining double pipe in heat exchanger |
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| JP2018112133A JP7233857B2 (en) | 2018-06-12 | 2018-06-12 | Double tube joining method in heat exchanger |
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| JPH1038491A (en) * | 1996-07-23 | 1998-02-13 | Toyo Radiator Co Ltd | Double tube type heat exchanger |
| 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 |
-
2018
- 2018-06-12 JP JP2018112133A patent/JP7233857B2/en active Active
-
2019
- 2019-06-12 WO PCT/JP2019/023379 patent/WO2019240204A1/en active Application Filing
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| 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 |
| 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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| JP7233857B2 (en) | 2023-03-07 |
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