JP6530235B2 - Heat exchanger and method of manufacturing the same - Google Patents

Heat exchanger and method of manufacturing the same Download PDF

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JP6530235B2
JP6530235B2 JP2015101577A JP2015101577A JP6530235B2 JP 6530235 B2 JP6530235 B2 JP 6530235B2 JP 2015101577 A JP2015101577 A JP 2015101577A JP 2015101577 A JP2015101577 A JP 2015101577A JP 6530235 B2 JP6530235 B2 JP 6530235B2
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tube
header
heat exchanger
groove
tubes
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JP2016217587A (en
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祐介 飯野
祐介 飯野
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Sanden Holdings Corp
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Sanden Holdings Corp
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Priority to JP2015101577A priority Critical patent/JP6530235B2/en
Priority to PCT/JP2016/063970 priority patent/WO2016185959A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • 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
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F28F9/182—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding the heat-exchange conduits having ends with a particular shape, e.g. deformed; the heat-exchange conduits or end plates having supplementary joining means, e.g. abutments
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/14—Heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing
    • F28F2275/045—Fastening; Joining by brazing with particular processing steps, e.g. by allowing displacement of parts during brazing or by using a reservoir for storing brazing material

Description

本発明は、例えば車両用空気調和装置の蒸発器、放熱器またはヒータ等として用いられる熱交換器及びその製造方法に関するものである。   The present invention relates to a heat exchanger used as, for example, an evaporator, a radiator or a heater of a vehicle air conditioner, and a method of manufacturing the same.

従来、この種の熱交換器としては、円筒状に形成された熱媒体流通用のヘッダーと、互いにヘッダーの軸方向に間隔をおいて配置され、それぞれの端部をヘッダーに接続された熱媒体流通用の複数の扁平状チューブと、各チューブの間に設けられた伝熱フィンとを備えたものが知られている（例えば、特許文献１参照）。   Heretofore, as a heat exchanger of this type, a cylindrically formed heat medium circulation header and a heat medium which are mutually spaced apart in the axial direction of the header and each end is connected to the header There is known one provided with a plurality of flat tubes for circulation and heat transfer fins provided between the respective tubes (see, for example, Patent Document 1).

この熱交換器を製造する場合は、ヘッダーの側面に設けられた複数の接続孔に各チューブの端部をそれぞれヘッダーの内側まで挿入し、各チューブの間に伝熱フィンを配置して高温の炉中にてろう付けすることにより、ヘッダー、各チューブ及びフィンを接合するようにしている。   When manufacturing this heat exchanger, insert the end of each tube into the connection holes provided on the side of the header to the inside of the header and place the heat transfer fins between the tubes for high temperature The header, tubes and fins are joined by brazing in a furnace.

特開平０９−２７３８８３Japanese Patent Application Laid-Open No. 09-273883

しかしながら、前記熱交換器をろう付けにより接合する際、溶融したろう材がヘッダーの外部から接続孔とチューブの外周面との間を通じてヘッダー内に流入すると、ろう材がチューブの外周面からチューブの端面まで流れ込み、チューブの端面に開口する熱媒体流通孔がろう材によって閉塞されるという問題点があった。   However, when the heat exchanger is joined by brazing, if the molten brazing material flows from the outside of the header into the header through between the connection hole and the outer peripheral surface of the tube, the brazing material from the outer peripheral surface of the tube There has been a problem that the heat medium flow holes which flow into the end face and open at the end face of the tube are blocked by the brazing material.

特に、熱媒体として二酸化炭素冷媒を使用する熱交換器では、フロン冷媒の約１０倍の耐圧性を得るために、熱媒体流通孔を小さくして壁厚を大きくしたチューブが用いられることから、熱媒体流通孔の開口部がろう材によって詰まりやすかった。また、耐圧性確保のためにチューブと接合孔の縁部との間に十分なろう付けフィレットを形成する必要があることから、ろう材の使用量が多くなり、過剰なろう材によってもチューブの外周面にろう材流れを生じさせやすくなっていた。   In particular, in a heat exchanger using a carbon dioxide refrigerant as a heat medium, a tube having a small heat medium flow hole and a large wall thickness is used to obtain a pressure resistance of about 10 times that of a fluorocarbon refrigerant. The opening of the heat medium flow hole was likely to be clogged by the brazing material. In addition, since it is necessary to form a sufficient brazing fillet between the tube and the edge of the joint hole to ensure pressure resistance, the amount of brazing material used increases, and excessive brazing material may also It was easy to cause the flow of the brazing material on the outer peripheral surface.

更に、チューブは押出成形によって成形されるため、チューブの表面に押出成形によるダイスライン（成形時にダイスと材料との摩擦によって生ずる押出方向（チューブの長手方向）に付く条線）が形成される。このため、ダイスラインによってチューブの長手方向へのろう材の流れが促進され、チューブの端面にろう材が誘導されやすくなっていた。特に、押出成形後のチューブには、防食のために亜鉛の溶射による表面処理が施されるが、表面処理のコーティングによってダイスラインが視認しずらくなり、ダイスラインによるろう材流れの促進が生じていることに気付かない場合もあった。   Furthermore, since the tube is formed by extrusion, a die line by extrusion (a line attached in the extrusion direction (longitudinal direction of the tube) generated by friction between the die and the material at the time of molding) is formed on the surface of the tube. Therefore, the flow of the brazing material in the longitudinal direction of the tube is promoted by the die line, and the brazing material is easily guided to the end face of the tube. In particular, the tube after extrusion is subjected to surface treatment by thermal spraying of zinc for anticorrosion, but the coating of the surface treatment makes it difficult to visually recognize the die line, and the flow of brazing material is promoted by the die line. Sometimes did not notice that

そこで、従来では、フラックスの使用量を低減してろう材の流動性を低下させたり、ろう材の使用量削減、ヘッダーとチューブとの隙間管理、ヘッダーへのチューブ挿入長さを大きくするなど、チューブの端面へのろう材流れを抑制するようにしているが、このような対策によってもろう材の流れを完全に抑制することは困難であり、熱媒体流通孔のろう材詰まりを効果的に防止することはできなかった。   Therefore, conventionally, the amount of flux used is reduced to reduce the flowability of the brazing material, the amount of usage of the brazing material is reduced, the gap between the header and the tube is managed, the tube insertion length to the header is increased, etc. Although the flow of brazing material to the end face of the tube is suppressed, it is difficult to completely suppress the flow of the brazing material even by such measures, and it is effective to block the brazing material of the heat medium flow holes. It could not be prevented.

本発明は前記問題点に鑑みてなされたものであり、その目的とするところは、チューブの外周面におけるろう材流れが生じた場合でも、熱媒体流通孔のろう材詰まりを効果的に防止することのできる熱交換器及びその製造方法を提供することにある。   The present invention has been made in view of the above problems, and the object of the present invention is to effectively prevent the brazing material clogging of the heat medium flow holes even when the brazing material flows on the outer peripheral surface of the tube. It is an object of the present invention to provide a heat exchanger that can be used and a method of manufacturing the same.

本発明は前記目的を達成するために、筒状に形成された熱媒体流通用のヘッダーと、互いにヘッダーの軸方向に間隔をおいて配置され、長手方向両端に複数の熱媒体流通孔が開口する熱媒体流通用の複数の扁平状チューブとを備え、ヘッダーの側面に設けられた複数の接続孔に各チューブの端部をそれぞれヘッダーの内側まで挿入し、ヘッダーと各チューブとをろう付けにより接合するようにした熱交換器において、前記各チューブの端部側の外周面にチューブの幅方向に延びる溝を設け、前記溝をヘッダーの内面における接続孔の縁部よりもチューブの先端側に位置するように形成している。   In order to achieve the above object, the present invention provides a cylindrically formed heat medium circulation header and a plurality of heat medium circulation holes opened at both ends in the longitudinal direction, spaced from each other in the axial direction of the header. The end of each tube is inserted to the inside of the header into a plurality of connection holes provided on the side of the header, and the header and each tube are brazed. In the heat exchanger to be joined, a groove extending in the width direction of the tube is provided on the outer peripheral surface on the end side of each of the tubes, and the groove is closer to the tip of the tube than the edge of the connection hole on the inner surface of the header. It is formed to be located.

また、本発明は前記目的を達成するために、筒状に形成された熱媒体流通用のヘッダーと、互いにヘッダーの軸方向に間隔をおいて配置され、長手方向両端に複数の熱媒体流通孔が開口する熱媒体流通用の複数の扁平状チューブとを備え、ヘッダーの側面に設けられた複数の接続孔に各チューブの端部をそれぞれヘッダーの内側まで挿入し、ヘッダーと各チューブとをろう付けにより接合する熱交換器の製造方法において、前記各チューブの端部側の外周面にチューブの幅方向に延びる溝を設けるとともに、前記溝がヘッダーの内面における接続孔の縁部よりもチューブの先端側に位置するように各チューブの端部をヘッダーの接続孔に挿入し、ヘッダーと各チューブとをろう付けにより接合するようにしている。   Further, in order to achieve the above object, the present invention provides a tubular heat medium circulation header and a plurality of heat medium circulation holes which are arranged mutually spaced apart in the axial direction of the header from each other in the longitudinal direction. Insert a plurality of flat tubes for heat medium circulation, and insert the end of each tube into the plurality of connection holes provided on the side of the header to the inside of the header, respectively, and solder the header and each tube In the method of manufacturing a heat exchanger to be joined by attachment, a groove extending in the width direction of the tube is provided on the outer peripheral surface on the end side of each of the tubes, and the groove is formed on the inner surface of the header The end of each tube is inserted into the connection hole of the header so as to be located on the tip side, and the header and each tube are joined by brazing.

これにより、各チューブの端部側の外周面にチューブの幅方向に延びる溝が設けられることから、接続孔からヘッダー内にろう材が流入し、チューブの外周面にろう材流れが生じた場合でも、溝によってチューブの先端側へのろう材の流れが阻止または抑制される。この場合、溝がヘッダーの内面における接続孔の縁部よりもチューブの先端側に位置することから、ヘッダーの内面側に形成されるフィレットに溝が埋没することがない。   Thereby, since the groove extending in the width direction of the tube is provided on the outer peripheral surface on the end side of each tube, the brazing material flows into the header from the connection hole and the flow of the brazing material occurs on the outer peripheral surface of the tube However, the groove prevents or suppresses the flow of the brazing material to the distal end side of the tube. In this case, since the groove is located closer to the tip of the tube than the edge of the connection hole on the inner surface of the header, the groove is not buried in the fillet formed on the inner surface of the header.

本発明によれば、チューブの外周面にろう材流れが生じた場合でも、チューブの外周面に設けた溝によってチューブの先端側へのろう材の流れを阻止または抑制することができるので、ろう材がチューブの端面まで流れ込んで熱媒体流通孔を閉塞させることがなく、熱媒体流通孔のろう材詰まりを効果的に防止することができる。この場合、ヘッダーの内面側に形成されるフィレットに溝が埋没することがないので、溝の機能を確実に維持することができる。   According to the present invention, even when the flow of the brazing material occurs on the outer peripheral surface of the tube, the flow of the brazing material to the distal end side of the tube can be blocked or suppressed by the groove provided on the outer peripheral surface of the tube. The material does not flow into the end face of the tube to block the heat medium flow hole, and the clogging of the heat medium flow hole can be effectively prevented. In this case, since the groove is not buried in the fillet formed on the inner surface side of the header, the function of the groove can be reliably maintained.

本発明の第１の実施形態を示す熱交換器の斜視図FIG. 1 is a perspective view of a heat exchanger showing a first embodiment of the present invention ヘッダーの部分側面図Partial side view of the header チューブの要部平面図Top view of the main part of the tube チューブの図２におけるＡ−Ａ線矢視方向断面図A sectional view in the direction of arrows AA in FIG. 2 of the tube ヘッダー及びチューブの一部断面部分斜視図Partial cross section and partial perspective view of header and tube ヘッダー及びチューブの一部断面部分分解斜視図Partial cross section and partial exploded perspective view of header and tube ヘッダーへのチューブ挿入工程を示す平面図Top view showing the process of inserting the tube into the header ヘッダーへのチューブ挿入状態を示す平面図Top view showing the tube inserted into the header ろう付け時のヘッダー及びチューブを示す平面図Top view showing header and tube at the time of brazing ろう付け時のヘッダー及びチューブを示す平面図Top view showing header and tube at the time of brazing チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す一部断面平面図A partial sectional plan view showing the manufacturing process of the tube チューブの製造工程を示す一部断面平面図A partial sectional plan view showing the manufacturing process of the tube チューブの製造工程を示す一部断面平面図A partial sectional plan view showing the manufacturing process of the tube チューブの製造工程を示す一部断面側面図Partial cross-sectional side view showing tube manufacturing process チューブの製造工程を示す側面図Side view showing tube manufacturing process チューブの製造工程を示す側面断面図Side sectional view showing the manufacturing process of the tube チューブの製造工程を示す側面断面図Side cross-sectional view showing the manufacturing process of the tube 本発明の第２の実施形態におけるチューブの斜視図The perspective view of the tube in the 2nd embodiment of the present invention ヘッダーへのチューブ挿入状態を示す平面図Top view showing the tube inserted into the header 本発明の第３の実施形態におけるチューブの斜視図A perspective view of a tube according to a third embodiment of the present invention チューブの製造工程を示す正面断面図Front sectional view showing a manufacturing process of a tube チューブの製造工程を示す正面断面図Front sectional view showing a manufacturing process of a tube チューブの製造工程を示す正面断面図Front sectional view showing a manufacturing process of a tube チューブの製造工程を示す一部断面平面図A partial sectional plan view showing the manufacturing process of the tube チューブの製造工程を示す一部断面平面図A partial sectional plan view showing the manufacturing process of the tube チューブの製造工程を示す一部断面平面図A partial sectional plan view showing the manufacturing process of the tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube チューブの製造工程を示す斜視図The perspective view which shows the manufacturing process of a tube

図１乃至図２３は本発明の第１の実施形態を示すもので、例えば車両用空気調和装置の蒸発器、放熱器またはヒータとして用いられ、熱媒体としての二酸化炭素冷媒を流通する熱交換器を示すものである。   1 to 23 show a first embodiment of the present invention, which is used, for example, as an evaporator, a radiator or a heater of a vehicle air conditioner, and which circulates a carbon dioxide refrigerant as a heat medium. Is an indicator of

この熱交換器は、熱交換器本体の幅方向両側に３本ずつ配置された熱媒体流通用のヘッダー１０と、互いに各ヘッダー１０の軸方向に間隔をおいて配置された複数の熱媒体流通用のチューブ２０と、各チューブ２０の間に配置された伝熱用のフィン３０とから構成され、各チューブ２０は長手方向の両端部をそれぞれ各ヘッダー１０の側面に接続されている。   The heat exchanger comprises a plurality of heat medium flow headers 10 disposed three on each side of the heat exchanger body in the width direction, and a plurality of heat medium flows disposed at intervals in the axial direction of each header 10. The tubes 20 and the fins 30 for heat transfer disposed between the tubes 20 are connected to the side surfaces of the headers 10 at both longitudinal ends.

各ヘッダー１０は、アルミニウム等の金属を上下方向に延びる円筒状に形成した部材からなり、その側面（周壁面）には、各チューブ２０の端部がそれぞれ接続される複数の接続孔１１が互いに上下方向に等間隔で設けられている。接続孔１１はヘッダー１０の周方向に延びる長孔状に形成され、ヘッダー１０の周壁部を貫通するように形成されている。各ヘッダー１０は、熱交換器本体の前後方向に３本ずつ近接して配列され、その上端及び下端は蓋部材１２によってそれぞれ閉塞されている。蓋部材１２は熱交換器本体の前後方向に配列される３本のヘッダー１０の上端または下端開口部をそれぞれ閉塞する３つの蓋部１２ａを有し、各蓋部１２ａは互いに一体に形成されている。   Each header 10 is a cylindrically-extending member formed of a metal such as aluminum in the vertical direction, and a plurality of connection holes 11 to which end portions of the tubes 20 are respectively connected are formed on the side surface (peripheral wall surface) It is provided at equal intervals in the vertical direction. The connection hole 11 is formed in the shape of a long hole extending in the circumferential direction of the header 10 and is formed to penetrate the peripheral wall portion of the header 10. The respective headers 10 are arranged in close proximity to each other three each in the front-rear direction of the heat exchanger body, and the upper end and the lower end thereof are closed by the lid member 12 respectively. The lid member 12 has three lid portions 12a which respectively close the upper end or lower end opening portion of the three headers 10 arranged in the front-rear direction of the heat exchanger main body, and the lid portions 12a are integrally formed with each other There is.

各チューブ２０は、アルミニウム等の金属の押出成形品からなり、上下方向の寸法が幅方向の寸法に対して小さい扁平状に形成されている。また、チューブ２０の幅方向両端は半円形の曲面状に形成されている。チューブ２０には、複数の熱媒体流通孔２１が互いに幅方向に等間隔で設けられ、各熱媒体流通孔２１は上下方向に長い断面長円形状に形成されている。熱媒体流通孔２１は、その中心を通る幅Ｗの最小値が１．６ｍｍ未満（例えば、０．５ｍｍ）に形成され、その中心を通る高さＨは、例えば０．７ｍｍに形成されている。一般に、車両用空気調和装置にフロン冷媒（Ｒ−１３４ａ）を使用する場合は、熱媒体流通孔の中心を通る幅が１．６ｍｍのチューブが主に用いられるが、二酸化炭素冷媒を使用する本実施形態では、チューブ２０の壁厚を大きくして耐圧性を確保するために、熱媒体流通孔２１の中心を通る幅の最小値を１．６ｍｍ未満としている。また、チューブ２０の端部側はヘッダー１０の接続孔１１に挿入される挿入部２２を形成しており、挿入部２２は他の部分（チューブ２０の長手方向中央側）よりも幅が狭くなっている。これにより、挿入部２２と他の部分との間には、チューブ挿入時に接続孔１１の縁部に係止する段差部２３が形成されている。また、挿入部２２は、段差部２３からチューブ２０の先端側に向かって徐々に幅が狭くなるように延びるテーパ部２２ａと、テーパ部２２ａからチューブ２０の先端まで同一幅で延びるストレート部２２ｂとからなり、テーパ部２２ａの基端側（段差部２３側）は接続孔１１と同等の幅寸法に形成されている。更に、挿入部２２の厚さ方向両面（図中上面及び下面）には、チューブ２０の幅方向に延びる溝２４がそれぞれ設けられ、各溝２４はストレート部２２ｂに配置されている。溝２４は断面略半円形状に形成され、ストレート部２２ｂの幅方向一端側から他端側に亘って直線状に形成されている。   Each tube 20 is made of an extrusion-molded product of a metal such as aluminum, and is formed in a flat shape whose vertical dimension is smaller than its widthwise dimension. Further, both ends in the width direction of the tube 20 are formed in a semicircular curved surface. In the tube 20, a plurality of heat medium flow holes 21 are provided at equal intervals in the width direction, and each heat medium flow hole 21 is formed in an oval shape having a long cross section in the vertical direction. The heat medium flow through hole 21 is formed such that the minimum value of the width W passing through the center thereof is less than 1.6 mm (for example, 0.5 mm), and the height H passing through the center is formed, for example, 0.7 mm. . In general, when a fluorocarbon refrigerant (R-134a) is used in a vehicle air conditioner, a tube having a width of 1.6 mm passing through the center of the heat medium flow hole is mainly used, but a carbon dioxide refrigerant is used. In the embodiment, in order to increase the wall thickness of the tube 20 to ensure pressure resistance, the minimum value of the width passing through the center of the heat medium flow passage 21 is less than 1.6 mm. Further, the end side of the tube 20 forms an insertion portion 22 which is inserted into the connection hole 11 of the header 10, and the insertion portion 22 is narrower in width than the other portion (the longitudinal center side of the tube 20) ing. Thereby, between the insertion part 22 and other parts, the level | step-difference part 23 latched to the edge of the connection hole 11 at the time of tube insertion is formed. Further, the insertion portion 22 has a tapered portion 22a extending so as to gradually narrow in width from the step portion 23 toward the tip end of the tube 20, and a straight portion 22b extending in the same width from the taper portion 22a to the tip of the tube 20 The base end side (step portion 23 side) of the tapered portion 22 a is formed to have the same width as the connection hole 11. Further, grooves 24 extending in the width direction of the tube 20 are respectively provided on both surfaces (upper and lower surfaces in the drawing) of the insertion portion 22 in the thickness direction, and the grooves 24 are disposed in the straight portion 22b. The groove 24 is formed in a substantially semicircular shape in cross section, and is formed in a straight line from one end side to the other end side in the width direction of the straight portion 22b.

各伝熱フィン３０は、アルミニウム等の金属板を波形状に形成した部材からなり、それぞれ各チューブ２０の間に配置されるとともに、最上位及び最下位に配置されるチューブ２０の外側にも配置されている。   Each heat transfer fin 30 is a member formed by forming a metal plate such as aluminum in a wave shape, and is disposed between the respective tubes 20 and also disposed on the outside of the tubes 20 disposed at the highest position and the lowest position. It is done.

前記熱交換器は、互いに間隔をおいて配置された一対のヘッダー１０にチューブ２０の両端部をそれぞれ接続するとともに、各チューブ２０の間に伝熱フィン３０を配置したものが熱交換器の前後方向に３組配列される。この場合、最上位及び最下位のチューブ２０の外側に配置される伝熱フィン３０は、チューブ２０に沿って延びる端板３１によってそれぞれ覆われる。各端板３１は長手方向両端側をチューブ２０側に屈曲するとともに、３列の伝熱フィン３０を全て覆う幅に形成されている。更に、熱交換器の幅方向一端側に配置される各ヘッダー１０のうち、最前列及び最後列のヘッダー１０の下端には熱媒体流入パイプ１３及び熱媒体流出パイプ１４がそれぞれ外部に向かって延びるように設けられている。   The heat exchangers respectively connect both ends of the tubes 20 to a pair of headers 10 spaced apart from each other, and the heat transfer fins 30 are disposed between the tubes 20 before and after the heat exchangers. Three sets are arranged in the direction. In this case, the heat transfer fins 30 disposed outside the top and bottom tubes 20 are covered by end plates 31 extending along the tubes 20 respectively. Each end plate 31 is bent to the tube 20 side at both ends in the longitudinal direction and is formed in a width that covers all the three rows of heat transfer fins 30. Further, among the headers 10 disposed at one end side in the width direction of the heat exchanger, the heat medium inflow pipe 13 and the heat medium outflow pipe 14 respectively extend outward at the lower ends of the headers 10 in the front row and the last row. It is provided as.

ヘッダー１０にチューブ２０の端部を接続する場合は、チューブ２０の挿入部２２をヘッダー１０の接続孔１１に挿入するとともに、チューブ２０の段差部２３を接続孔１１の縁部に係止することにより、チューブ２０がヘッダー１０に対して挿入方向に位置決めされる。その際、挿入部２２の先端側のストレート部２ｂがテーパ部２２ａによって接続孔１１よりも幅寸法が小さくなっているので、挿入部２２を接続孔１１に容易に挿入することができる。チューブ２０が接続孔１１に段差部２３で位置決めされるまで挿入されると、チューブ２０の溝２４はヘッダー１０の内面における接続孔１１の開口縁よりもチューブ２０の先端側に位置する。即ち、溝２４は、図８に示すように、ヘッダー１０の内周面に沿って湾曲した接続孔１１の両端をそれぞれ通る直線（図中一点鎖線）の位置Ｐよりもチューブ２０の先端側に配置される。   When connecting the end of the tube 20 to the header 10, insert the insertion portion 22 of the tube 20 into the connection hole 11 of the header 10 and lock the step 23 of the tube 20 to the edge of the connection hole 11 The tube 20 is positioned relative to the header 10 in the insertion direction. At this time, since the straight portion 2b on the tip end side of the insertion portion 22 has a smaller width than the connection hole 11 by the tapered portion 22a, the insertion portion 22 can be easily inserted into the connection hole 11. When the tube 20 is inserted into the connection hole 11 until it is positioned by the step portion 23, the groove 24 of the tube 20 is positioned on the tip side of the tube 20 than the opening edge of the connection hole 11 on the inner surface of the header 10. That is, as shown in FIG. 8, the groove 24 is closer to the tip end side of the tube 20 than a position P of a straight line (one-dot chain line in the drawing) passing through both ends of the connecting hole 11 curved along the inner circumferential surface of the header 10. Be placed.

前記熱交換器は、仮組みされた状態で高温の炉中でろう付けすることにより各部材が接合される。ヘッダー１０とチューブ２０との接合では、溶融したろう材がヘッダー１０の外側から接続孔１１とチューブ２０との間に流入し、図９に示すように、ヘッダー１０の外面側と内面側においては、接続孔１１の周縁とチューブ２０の外周面との間にろう材によるフィレットＦがそれぞれ形成される。その際、図１０に示すように、ヘッダー１０内に流入したろう材Ｒがチューブ２０の外周面からチューブ２０の先端に向かって流れると、チューブ２０の溝２４によってろう材Ｒの流れが阻止または抑制されることから、ろう材Ｒがチューブ２０の端面まで流れ込んで熱媒体流通孔２１を詰まらせることがない。また、溝２４はヘッダー１０の内面における接続孔１１の縁部よりもチューブ２０の先端側に位置していることから、ヘッダー１０の内面側のフィレットＦに溝２４が埋没することがない。   In the heat exchanger, the members are joined by brazing in a high-temperature furnace in a temporarily assembled state. In joining the header 10 and the tube 20, the molten brazing material flows from the outside of the header 10 between the connection hole 11 and the tube 20, and as shown in FIG. Fillet F made of brazing material is formed between the peripheral edge of the connection hole 11 and the outer peripheral surface of the tube 20, respectively. At that time, as shown in FIG. 10, when the brazing material R flowing into the header 10 flows from the outer peripheral surface of the tube 20 toward the tip of the tube 20, the groove 24 of the tube 20 prevents the flow of the brazing material R Because it is suppressed, the brazing material R does not flow into the end face of the tube 20 to clog the heat medium flow holes 21. Further, since the groove 24 is positioned on the tip end side of the tube 20 than the edge of the connection hole 11 in the inner surface of the header 10, the groove 24 does not bury in the fillet F on the inner surface of the header 10.

次に、前記チューブ２０の製造方法について、図１１乃至図２３を参照して説明する。まず、チューブとなる部分がチューブの長手方向に複数連続して一体となった扁平状のチューブ状部材２０′を押出成形によって成形した後、図１１及び図１２に示すようにチューブ状部材２０′に一対の金型４０を幅方向両側から押し付ける。この場合、各金型４０には、図１７乃至図１９に示すようにチューブ２０の挿入部２２、テーパ部２２ａ、ストレート部２２ｂ及び段差部２３を一対ずつ成形するための凹部４０ａが設けられている。次に、図１３に示すようにチューブ状部材２０′から各金型４０を分離すると、チューブ状部材２０′にテーパ部２２ａ及びストレート部２２ｂを有する挿入部２２と段差部２４が形成される。この後、図２１に示すように、チューブ状部材２０′に、チューブ状部材２０′を破断させるための切り込み状の破断可能部２５を形成するとともに、破断可能部２５を間にして一対の溝２４を形成する。この場合、図１４に示すように、破断可能部２５を形成するための第１のローラ４１の軸方向両側に、溝２４を形成するための第２のローラ４２を同軸状に配置するとともに、これらを一対ずつチューブ状部材２０′の厚さ寸法よりも小さい間隔をおいて上下方向に対向して配置する。続いて、チューブ状部材２０′を各ローラ４１，４２で挟み込むようにして、図１５に示すようにチューブ状部材２０′の幅方向一端側から他端側まで各ローラ４１，４２を移動させながらチューブ状部材２０′に圧接する。これにより、チューブ状部材２０′の厚さ方向両面に破断可能部２５と一対の溝２４が同時に形成される。この場合、図２０に示すように、第１のローラ４１には先の尖った周縁を有するものが用いられ、第２のローラ４２には周縁が断面半円形の周縁を有するものが用いられる。この後、図１６に示すように、チューブ状部材２０′に長手方向への引張力を付与することにより、図２３に示すようにチューブ状部材２０′を破断可能部２５から破断する。この場合、例えばチューブ状部材２０′の長手方向二箇所を破断可能部２５が間に位置するように図示しないクランプで挟持し、クランプにチューブ状部材２０′の長手方向反対側への力を加えることにより、チューブ状部材２０′に長手方向への引張力を付与する。そして、前記工程を繰り返すことにより、チューブ状部材２０′から複数のチューブ２０を形成する。   Next, a method of manufacturing the tube 20 will be described with reference to FIGS. First, a flat tube-shaped member 20 'in which a plurality of portions to be a tube are continuously integrated in the longitudinal direction of the tube is formed by extrusion, and then the tube-shaped member 20' is formed as shown in FIGS. The pair of molds 40 is pressed from both sides in the width direction. In this case, as shown in FIGS. 17 to 19, each mold 40 is provided with a recess 40a for forming a pair of the insertion portion 22, taper portion 22a, straight portion 22b and step portion 23 of the tube 20. There is. Next, as shown in FIG. 13, when the respective molds 40 are separated from the tube-shaped member 20 ', the insertion portion 22 having the tapered portion 22a and the straight portion 22b and the step portion 24 are formed in the tube-shaped member 20'. Thereafter, as shown in FIG. 21, a cut-like breakable portion 25 for breaking the tube-like member 20 'is formed in the tube-like member 20', and a pair of grooves is formed with the breakable portion 25 in between. Form 24. In this case, as shown in FIG. 14, second rollers 42 for forming the grooves 24 are coaxially arranged on both sides in the axial direction of the first roller 41 for forming the breakable portion 25, These are disposed to face each other in the vertical direction at intervals smaller than the thickness dimension of the tubular member 20 '. Subsequently, the tubular member 20 'is sandwiched by the rollers 41 and 42, and as shown in FIG. 15, the rollers 41 and 42 are moved from one end side to the other end side in the width direction of the tubular member 20'. The tube-shaped member 20 'is pressure-welded. As a result, the frangible portion 25 and the pair of grooves 24 are simultaneously formed on both sides in the thickness direction of the tubular member 20 '. In this case, as shown in FIG. 20, the first roller 41 has a pointed peripheral edge, and the second roller 42 has a peripheral edge with a semicircular cross section. Thereafter, as shown in FIG. 16, by applying a tensile force in the longitudinal direction to the tubular member 20 ', the tubular member 20' is broken from the breakable portion 25 as shown in FIG. In this case, for example, two longitudinal portions of the tubular member 20 'are held by a clamp (not shown) so that the breakable portion 25 is positioned therebetween, and a force is applied to the clamp to the opposite longitudinal direction of the tubular member 20'. As a result, a tensile force in the longitudinal direction is applied to the tubular member 20 '. And a plurality of tubes 20 are formed from tube-shaped member 20 'by repeating the above-mentioned process.

このように、本実施形態によれば、各チューブ２０の端部側の外周面にチューブ２０の幅方向に延びる溝２４を設けたので、接続孔１１からヘッダー１０内にろう材が流入し、チューブ２０の外周面にろう材流れが生じた場合でも、溝２４によってチューブ２０の先端側へのろう材の流れを阻止または抑制することができる。これにより、ろう材がチューブ２０の端面まで流れ込んで熱媒体流通孔２１を閉塞させることがなく、熱媒体流通孔２１のろう材詰まりを効果的に防止することができる。この場合、溝２４をヘッダー１０の内面における接続孔１１の縁部よりもチューブ２０の先端側に位置させるようにしたので、ヘッダー１０の内面側に形成されるフィレットＦに溝２４が埋没することがなく、溝２４の機能を確実に維持することができる。尚、チューブ２０の耐圧性はヘッダー１０の外部に配置される部分に要求されるが、チューブ２０の溝２４はヘッダー１０の内部に配置されるので、溝２４を設けた部分の強度低下はチューブ２０の耐圧性に影響を与えることはない。   As described above, according to the present embodiment, since the groove 24 extending in the width direction of the tube 20 is provided on the outer peripheral surface on the end side of each tube 20, the brazing material flows into the header 10 from the connection hole 11; Even when the flow of the brazing material occurs on the outer peripheral surface of the tube 20, the groove 24 can prevent or suppress the flow of the brazing material to the distal end side of the tube 20. As a result, the brazing material does not flow into the end face of the tube 20 to block the heat medium flow holes 21, and clogging of the heat medium flow holes 21 can be effectively prevented. In this case, since the groove 24 is positioned closer to the end of the tube 20 than the edge of the connection hole 11 on the inner surface of the header 10, the groove 24 is buried in the fillet F formed on the inner surface of the header 10. And the function of the groove 24 can be reliably maintained. Although the pressure resistance of the tube 20 is required for the portion disposed outside the header 10, since the groove 24 of the tube 20 is disposed inside the header 10, the strength reduction of the portion provided with the groove 24 is a tube It does not affect the pressure resistance of 20.

また、押出成形されるチューブ２０は、チューブ２０の表面に押出成形によるダイスラインが形成されるが、ダイスラインによってチューブ２０の長手方向へのろう材の流れが促進された場合でも、溝２４によってチューブ２０の先端側へのろう材の流れを阻止または抑制することができるので、押出成形によるチューブ２０を用いる場合に極めて有利である。   Also, although the extruded tube 20 has a die line formed by extrusion on the surface of the tube 20, the groove 24 allows the flow of the brazing material in the longitudinal direction of the tube 20 to be promoted by the die line. Since the flow of the brazing material to the distal end side of the tube 20 can be prevented or suppressed, it is extremely advantageous when using the extruded tube 20.

更に、熱媒体として二酸化炭素冷媒を使用する場合は、チューブ２０の壁厚を大きくして耐圧性を確保するために、熱媒体流通孔２１の中心を通る幅の最小値が１．６ｍｍ未満のチューブ２０が用いられるが、前述のようにチューブ２０の先端側へのろう材の流れを阻止または抑制することができるので、熱媒体流通孔２１が小さくろう材詰まりを生じやすい二酸化炭素冷媒用の熱交換器には極めて有利である。   Furthermore, in the case of using a carbon dioxide refrigerant as the heat medium, the minimum value of the width passing through the center of the heat medium flow hole 21 is less than 1.6 mm in order to increase the wall thickness of the tube 20 to ensure pressure resistance. Although the tube 20 is used, since the flow of the brazing material to the tip end side of the tube 20 can be prevented or suppressed as described above, the heat medium flow holes 21 are small, and for the carbon dioxide refrigerant which is easily prone to clogging of the brazing material. Very advantageous for heat exchangers.

また、チューブ２０となる部分がチューブの長手方向に複数連続して一体となった扁平状のチューブ状部材２０′からチューブ２０を形成する際、例えば切断刃を用いてチューブ状部材２０′を切断する場合では、切断による切粉で熱媒体流通孔２１に目詰まりを生じたり、或いは切断刃によるチューブ２０の厚さ方向への圧力により熱媒体流通孔２１が圧潰することがあるが、本実施形態では、チューブ状部材２０′の厚さ方向両面に幅方向に延びる破断可能部２５を形成し、チューブ状部材２０′に長手方向への引張力を付与してチューブ状部材２０′を破断可能部２５から破断させることによりチューブ２０を形成するようにしているので、切断のような切粉やチューブ２０の厚さ方向への圧力が発生することがなく、チューブ状部材２０′からチューブ２０を形成する際における熱媒体流通孔２１の閉塞防止に極めて効果的である。   Further, when forming the tube 20 from a flat tube-shaped member 20 'in which a plurality of portions to be the tube 20 are integrated continuously in the longitudinal direction of the tube, the tube-shaped member 20' is cut using a cutting blade, for example In this case, the heat medium flow holes 21 may be clogged by chips generated by cutting, or the pressure in the thickness direction of the tube 20 by the cutting blade may crush the heat medium flow holes 21. In the embodiment, the rupturable portion 25 extending in the width direction is formed on both sides in the thickness direction of the tubular member 20 ', and a tensile force in the longitudinal direction is applied to the tubular member 20' to break the tubular member 20 '. Since the tube 20 is formed by breaking it from the portion 25, the tube-shaped member does not generate pressure in the thickness direction of the chips or the tube 20 such as cutting. 0 'it is very effective in preventing clogging of the heat medium flow hole 21 at the time of forming the tube 20.

更に、チューブ状部材２０′に破断可能部２５と同時に溝２４を形成するようにしたので、溝２４を形成するための別工程を必要とせず、生産性の向上を図ることができる。   Further, since the groove 24 is formed at the same time as the frangible portion 25 in the tubular member 20 ', a separate process for forming the groove 24 is not required, and productivity can be improved.

この場合、チューブ状部材２０′の厚さ方向両面に、切り込み状の破断可能部２５を形成するための第１のローラ４１と、溝２４を形成するための第２のローラ４２とをチューブ状部材２０′の幅方向に移動させながら圧接させることにより、チューブ状部材２０′に破断可能部２５と溝２４とを同時に形成するようにしたので、破断可能部２５及び溝２４を効率よく形成することができ、生産性の向上に極めて有利である。   In this case, the first roller 41 for forming the cut-away rupturable portion 25 on both sides in the thickness direction of the tube-shaped member 20 ′ and the second roller 42 for forming the groove 24 are tube-shaped. Since the frangible portion 25 and the groove 24 are simultaneously formed in the tubular member 20 'by moving and pressing the material while moving in the width direction of the member 20', the frangible portion 25 and the groove 24 are efficiently formed. It is extremely advantageous for improving productivity.

尚、前記実施形態では、チューブ２０の長手方向一箇所に溝２４を設けたものを示したが、図２４及び図２５に示す第２の実施形態のように、複数の溝２４をチューブ２０の長手方向に間隔をおいて設けるようにすれば、複数の溝２４によって熱媒体流通孔２１のろう材詰まりをより効果的に防止することができる。この場合、各溝２４は、図２５に示すように、ヘッダー１０の内周面に沿って湾曲した接続孔１１の両端をそれぞれ通る直線（図中一点鎖線）の位置Ｐよりもチューブ２０の先端側に配置される。尚、図２５では、各溝２４の両方を位置Ｐよりもチューブ２０の先端側に配置したものを示したが、少なくとも一つの溝２４の全体が位置Ｐよりもチューブ２０の先端側に位置していれば、他の溝２４は必ずしも全体が位置Ｐよりもチューブ２０の先端側に位置していなくてもよい。   In the embodiment described above, the grooves 24 are provided at one place in the longitudinal direction of the tube 20. However, as in the second embodiment shown in FIGS. If the plurality of grooves 24 are spaced apart in the longitudinal direction, clogging of the heat medium flow holes 21 with brazing material can be more effectively prevented. In this case, as shown in FIG. 25, each groove 24 has a tip P of the tube 20 at a position P of a straight line (one-dot chain line in the drawing) passing through both ends of the connecting hole 11 curved along the inner peripheral surface of the header 10. Placed on the side. Although FIG. 25 shows that both grooves 24 are disposed on the tip side of the tube 20 than the position P, at least one groove 24 is entirely located on the tip side of the tube 20 than the position P. If so, the other grooves 24 may not necessarily be located entirely on the tip side of the tube 20 than the position P.

また、前記実施形態では、互いにチューブ２０の幅方向両端において連続していない溝２４をチューブ２０の厚さ方向両面にそれぞれ設けたものを示したが、図２６に示す第３の実施形態のように溝２４をチューブ２０の周方向に連続するように形成すれば、チューブ２０の幅方向両端側においても溝２４によって熱媒体流通孔２１のろう材詰まりを防止することができる。尚、このようにチューブ２０の周方向に連続する溝２４をチューブ２０の長手方向に間隔をおいて複数設けるようにしてもよい。   Moreover, in the said embodiment, although the thing which provided the groove | channel 24 which is not continuous each other in the width direction both ends of the tube 20 in the thickness direction both surfaces of the tube 20, respectively was shown, it is 3rd embodiment shown in FIG. If the grooves 24 are formed so as to be continuous in the circumferential direction of the tube 20, the grooves 24 can prevent clogging of the heat medium flow holes 21 also at both ends in the width direction of the tube 20. A plurality of grooves 24 continuous in the circumferential direction of the tube 20 may be provided at intervals in the longitudinal direction of the tube 20 as described above.

前述のようにチューブ２０の周方向に連続する溝２４を形成する場合は、図２７乃至図３２に示すように、前記金型４０の凹部４０ａ内に凸部４０ｂを設け、金型４０をチューブ状部材２０′に押し付ける際、凸部４０ｂによってチューブ２０の厚さ方向両面の溝２４の端部同士を連続させる連続部２４ａを形成する。この場合、凸部４０ｂは、チューブ状部材２０′の二箇所に形成される溝２４に対応する位置にそれぞれ設けられ、チューブ状部材２０′の幅方向端部に沿った円弧状に形成されている。   In the case where the groove 24 continuous in the circumferential direction of the tube 20 is formed as described above, as shown in FIGS. 27 to 32, the projection 40b is provided in the recess 40a of the mold 40, and the mold 40 is When pressing on the elongated member 20 ', the convex portion 40b forms a continuous portion 24a which allows the ends of the grooves 24 on both sides in the thickness direction of the tube 20 to be continuous. In this case, the convex portions 40b are respectively provided at positions corresponding to the grooves 24 formed at two places of the tube-shaped member 20 ', and are formed in an arc shape along the widthwise end of the tube-shaped member 20' There is.

これにより、各金型４０をチューブ状部材２０′に押し付けると、図３３に示すようにチューブ状部材２０′の幅方向両端側に溝２４と同一の断面形状の連続部２４ａがそれぞれ形成され、図３４及び図３５に示すように第１及び第２のローラ４１，４２をチューブ状部材２０′の幅方向一端側から他端側まで移動させながらチューブ状部材２０′に圧接することにより、チューブ状部材２０′の厚さ方向両面にそれぞれ溝２４を形成すると、各連続部２４ａによってチューブ状部材２０′の周方向に連続した溝２４が形成される。   Thereby, when each mold 40 is pressed against the tubular member 20 ', as shown in FIG. 33, continuous portions 24a having the same sectional shape as the groove 24 are formed on both ends in the width direction of the tubular member 20', As shown in FIGS. 34 and 35, the tube is brought into pressure contact with the tubular member 20 'while moving the first and second rollers 41 and 42 from the one end side to the other end side of the tubular member 20' in the width direction. When the grooves 24 are formed on both sides in the thickness direction of the elongated member 20 ', the continuous portions 24a form the continuous grooves 24 in the circumferential direction of the tubular member 20'.

このように、本実施形態では、チューブ状部材２０′にチューブ２０の挿入部２２及び段差部２４を形成するための金型４０の凹部４０ａ内に凸部４０ｂを設け、金型４０をチューブ状部材２０′に押し付ける際に、凸部４０ｂによってチューブ２０の厚さ方向両面の溝２４の端部同士を連続させる連続部２４ａを形成することにより、チューブ２０の周方向に連続した溝２４を形成するようにしたので、連続部２４ａを形成するための別工程を必要とせず、チューブ２０の周方向に連続した溝２４を効率よく形成することができる。   As described above, in the present embodiment, the convex portion 40 b is provided in the concave portion 40 a of the mold 40 for forming the insertion portion 22 and the step portion 24 of the tube 20 in the tubular member 20 ′. When pressing on the member 20 ', the continuous portion 24a connecting the end portions of the grooves 24 on both sides in the thickness direction of the tube 20 is formed by the convex portion 40b, thereby forming the continuous groove 24 in the circumferential direction of the tube 20 Thus, the groove 24 continuous in the circumferential direction of the tube 20 can be efficiently formed without requiring a separate step for forming the continuous portion 24 a.

１０…ヘッダー、１１…接続孔、２０…チューブ、２０′…チューブ状部材、２１…熱媒体流通孔、２４…溝、２４ａ…連続部、２５…破断可能部、４１…第１のローラ、４２…第２のローラ。   DESCRIPTION OF SYMBOLS 10 ... Header, 11 ... Connection hole, 20 ... Tube, 20 '... Tube-like member, 21 ... Heat-medium distribution hole, 24 ... Groove | channel, 24a ... Continuous part, 25 ... Breakable part, 41 ... 1st roller, 42 ... second roller.

Claims (14)

筒状に形成された熱媒体流通用のヘッダーと、互いにヘッダーの軸方向に間隔をおいて配置され、長手方向両端に複数の熱媒体流通孔が開口する熱媒体流通用の複数の扁平状チューブとを備え、ヘッダーの側面に設けられた複数の接続孔に各チューブの端部をそれぞれヘッダーの内側まで挿入し、ヘッダーと各チューブとをろう付けにより接合するようにした熱交換器において、
前記各チューブの端部側の外周面にチューブの幅方向に延びる溝を設け、
前記溝をヘッダーの内面における接続孔の縁部よりもチューブの先端側に位置するように形成した
ことを特徴とする熱交換器。 A tubular heat medium circulation header and a plurality of flat tubes for heat medium circulation arranged at intervals in the axial direction of the header and having a plurality of heat medium circulation holes open at both ends in the longitudinal direction And a heat exchanger in which the end of each tube is inserted to the inside of the header into a plurality of connection holes provided on the side of the header and the header and each tube are joined by brazing,
A groove extending in the width direction of the tubes is provided on the outer peripheral surface on the end side of each of the tubes,
A heat exchanger characterized in that the groove is located on the tip side of the tube than the edge of the connection hole on the inner surface of the header. 前記チューブを押出成形によって成形した
ことを特徴とする請求項１記載の熱交換器。 The heat exchanger according to claim 1, wherein the tube is formed by extrusion molding. 前記チューブは、熱媒体流通孔の中心を通る幅の最小値が１．６ｍｍ未満である
ことを特徴とする請求項１または２記載の熱交換器。 The heat exchanger according to claim 1 or 2, wherein the tube has a minimum width of less than 1.6 mm through the center of the heat medium flow passage. 前記溝をチューブの周方向に連続するように形成した
ことを特徴とする請求項１、２または３記載の熱交換器。 The heat exchanger according to claim 1, 2 or 3, wherein the groove is formed so as to be continuous in the circumferential direction of the tube. 前記各チューブに前記溝をチューブの長手方向に間隔をおいて複数ずつ設けた
ことを特徴とする請求項１、２、３または４記載の熱交換器。 The heat exchanger according to claim 1, 2, 3 or 4, wherein a plurality of the grooves are provided in each of the tubes at intervals in the longitudinal direction of the tubes. 筒状に形成された熱媒体流通用のヘッダーと、互いにヘッダーの軸方向に間隔をおいて配置され、長手方向両端に複数の熱媒体流通孔が開口する熱媒体流通用の複数の扁平状チューブとを備え、ヘッダーの側面に設けられた複数の接続孔に各チューブの端部をそれぞれヘッダーの内側まで挿入し、ヘッダーと各チューブとをろう付けにより接合する熱交換器の製造方法において、
前記各チューブの端部側の外周面にチューブの幅方向に延びる溝を設けるとともに、
前記溝がヘッダーの内面における接続孔の縁部よりもチューブの先端側に位置するように各チューブの端部をヘッダーの接続孔に挿入し、ヘッダーと各チューブとをろう付けにより接合する
ことを特徴とする熱交換器の製造方法。 A tubular heat medium circulation header and a plurality of flat tubes for heat medium circulation arranged at intervals in the axial direction of the header and having a plurality of heat medium circulation holes open at both ends in the longitudinal direction And in a method of manufacturing a heat exchanger in which an end of each tube is inserted into a plurality of connection holes provided on the side of the header to the inside of the header and the header and each tube are joined by brazing.
A groove extending in the width direction of the tube is provided on the outer peripheral surface on the end side of each of the tubes,
Insert the end of each tube into the connection hole of the header so that the groove is located on the tip side of the tube rather than the edge of the connection hole on the inner surface of the header, and connect the header and each tube by brazing. A method of manufacturing a heat exchanger characterized by the present invention. 前記チューブには押出成形により成形されたチューブが用いられる
ことを特徴とする請求項６記載の熱交換器の製造方法。 The method for manufacturing a heat exchanger according to claim 6, wherein a tube formed by extrusion molding is used for the tube. 前記チューブには、熱媒体流通孔の中心を通る幅の最小値が１．６ｍｍ未満のチューブが用いられる
ことを特徴とする請求項６または７記載の熱交換器の製造方法。 The method of manufacturing a heat exchanger according to claim 6 or 7, wherein a tube having a minimum value of less than 1.6 mm in width through the center of the heat medium flow passage is used for the tube. 前記溝がチューブの周方向に連続するように形成されたチューブを用いる
ことを特徴とする請求項６、７または８記載の熱交換器の製造方法。 The method for manufacturing a heat exchanger according to claim 6, 7, or 8, wherein the groove is a tube formed so as to be continuous in the circumferential direction of the tube. 前記各チューブに前記溝をチューブの長手方向に間隔をおいて複数ずつ設ける
ことを特徴とする請求項６、７、８または９記載の熱交換器の製造方法。 The method for manufacturing a heat exchanger according to claim 6, 7, 8 or 9, wherein a plurality of the grooves are provided in each of the tubes at intervals in the longitudinal direction of the tubes. 前記チューブとなる部分がチューブの長手方向に複数連続して一体となった扁平状のチューブ状部材の厚さ方向両面に幅方向に延びる破断可能部を形成し、
チューブ状部材に長手方向への引張力を付与してチューブ状部材を破断可能部から破断させることによりチューブを形成する
ことを特徴とする請求項６、７、８、９または１０記載の熱交換器の製造方法。 The portion to be the tube forms a breakable portion extending in the width direction on both sides in the thickness direction of the flat tube-like member in which a plurality of continuous in the longitudinal direction of the tube are integrated.
The heat exchange according to any one of claims 6, 7, 8, 9 or 10, wherein the tube is formed by applying a tensile force in the longitudinal direction to the tube-like member to break the tube-like member from the breakable portion. Method of the container. 前記チューブ状部材に破断可能部と同時に前記溝を形成する
ことを特徴とする請求項１１記載の熱交換器の製造方法。 The method for manufacturing a heat exchanger according to claim 11, wherein the groove is formed simultaneously with the frangible portion in the tubular member. 前記チューブ状部材の厚さ方向両面に、前記破断可能部を切り込み状に形成するための第１のローラと、前記溝を形成するための第２のローラとをチューブ状部材の幅方向に移動させながら圧接させることにより、チューブ状部材に破断可能部と前記溝とを同時に形成する
ことを特徴とする請求項１２記載の熱交換器の製造方法。 The first roller for forming the rupturable portion in a cut shape and the second roller for forming the groove are moved in the width direction of the tubular member on both sides in the thickness direction of the tubular member. The method for manufacturing a heat exchanger according to claim 12, wherein the frangible portion and the groove are simultaneously formed in the tube-like member by pressure-contacting while being made to move. 前記チューブ状部材の幅方向両端側にチューブ状部材の厚さ方向両面の溝の端部同士を連続させる連続部を形成することにより、チューブの周方向に連続した溝を形成する
ことを特徴とする請求項１３記載の熱交換器の製造方法。 A continuous groove is formed in the circumferential direction of the tube by forming a continuous portion connecting the ends of the grooves on both sides in the thickness direction of the tube-like member on both widthwise end sides of the tube-like member. The method of manufacturing a heat exchanger according to claim 13.
JP2015101577A 2015-05-19 2015-05-19 Heat exchanger and method of manufacturing the same Ceased JP6530235B2 (en)

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US5048602A (en) 1989-05-22 1991-09-17 Showa Aluminum Kabushiki Kaisha Heat exchangers
US5185925A (en) 1992-01-29 1993-02-16 General Motors Corporation Method of manufacturing a tube for a heat exchanger
JP3580942B2 (en) 1996-04-05 2004-10-27 昭和電工株式会社 Flat tubes for heat exchangers and heat exchangers equipped with the tubes
JPH10206079A (en) 1997-01-14 1998-08-07 Zexel Corp Heat-exchanger
DE19845336A1 (en) 1998-10-01 2000-04-06 Behr Gmbh & Co Multi-channel flat tube
DE19922673C1 (en) 1999-05-18 2000-08-31 Erbsloeh Ag Heat exchanger for automobiles in extruded aluminum uses impressed barrier in profile tube to guard against solder migration away from join.
US20040035916A1 (en) 2000-12-05 2004-02-26 Morton Syslak Process of connecting a heat exchanger tube to a manifold and tube especially made therefor
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WO2005102579A1 (en) * 2004-04-22 2005-11-03 Francesco Gropallo Furnace brazing process
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