WO2004099697A1 - Flat tube for aluminium heat exchanger - Google Patents

Flat tube for aluminium heat exchanger Download PDF

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Publication number
WO2004099697A1
WO2004099697A1 PCT/JP2004/006236 JP2004006236W WO2004099697A1 WO 2004099697 A1 WO2004099697 A1 WO 2004099697A1 JP 2004006236 W JP2004006236 W JP 2004006236W WO 2004099697 A1 WO2004099697 A1 WO 2004099697A1
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WO
WIPO (PCT)
Prior art keywords
flat
width direction
bent
flat surface
edges
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Application number
PCT/JP2004/006236
Other languages
French (fr)
Japanese (ja)
Inventor
Takaji Igami
Takumi Murayama
Original Assignee
T. Rad Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by T. Rad Co., Ltd. filed Critical T. Rad Co., Ltd.
Priority to EP04730112A priority Critical patent/EP1630512A1/en
Priority to US10/555,155 priority patent/US20070034366A1/en
Publication of WO2004099697A1 publication Critical patent/WO2004099697A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits

Definitions

  • the present invention relates to a flat tube for an aluminum heat exchanger, the cross section of which is bent in a B-shape, and the outer surface of which is coated with a brazing material.
  • a flat tube for an aluminum heat exchanger whose cross section is formed in a substantially B-shape, has a partition 7 at the center in the width direction and a bent top at the top. It is connected to seam 8. At the joint portion 8, both edges of the band-shaped material are folded back by 180 ° to expose the brazing material 3 on the inner surface side, and the brazing material 3 and the top of the partition 7 are in contact with each other.
  • the brazing material 3 fills the gap between the top of the partition 7 and the seam 8 as shown in Fig. 10. It is fixed by brazing. At this time, the fin 11 and the tube plate (not shown) are also integrally brazed and fixed. (See, for example, US Pat. No. 5,756,634.)
  • the B-type flat tube described above is characterized by high pressure resistance due to the presence of the partition 7.
  • a radiator in which a sacrificial anode material made of an aluminum alloy is coated on an inner surface side of a tube to improve corrosion resistance.
  • the brazing material on the outer surface of the tube When the brazing material is turned back, the widthwise edges of the strip are folded back toward the inner surface, and the brazing material is retained at the folded edges as shown in Fig. 10 when the brazing material is melted. It came into contact with the sacrificial anode material, and it was found that corrosion easily progressed to the touched part.
  • an object of the present invention is to provide a B-type flat tube that solves such a problem of inner surface corrosion. Disclosure of the invention
  • the present invention according to claim 1 is an aluminum strip having a core material (1) coated on the inner surface side with a sacrificial anode material (2) and an outer surface side coated with a brazing material (3).
  • the material is bent in the width direction, and a pair of first flat surfaces (4) and second flat surfaces (5) facing each other in parallel,
  • a partition portion (7) which is turned up inward at the center in the width direction of the first flat surface ( 4 ) and orthogonally to the first flat surface ( 4 );
  • both edges of the strip are bent and abutted, and the bent edge is connected to the partition (7).
  • a flat tube for an aluminum heat exchanger provided with a recessed solder pool (9) near the front ends of the both edge portions.
  • Both edges in the width direction have legs (13) bent at right angles to the second flat surface (5), and the leading edge is shorter than the legs (13), and the second flat surface is formed.
  • Both edges in the width direction have legs (13) bent at right angles to the second flat surface (5), and their leading edges are substantially parallel to the second flat surface (5).
  • This is a flat tube for an aluminum heat exchanger, which is bent and the bent edge of which is in contact with the top of the partition (7).
  • the present invention according to claim 6 is an aluminum strip having a core material (1) coated with a sacrificial anode material (2) on the inner surface side and a brazing material (3) coated on the outer surface side.
  • a first flat surface (4) and a second flat surface (5) which are bent in the width direction and are opposed to each other in parallel with each other; And both the flat surface (4) a pair of curved portion connecting between both sides in the width direction of the (5) (6), is raised by folding perpendicular thereto inward in the widthwise center of the first flat surface (4) Partition (7),
  • both edges of the strip are overlapped with each other, and the overlapped portion is connected to the partition (7), and the cross section is substantially flat.
  • One edge in the width direction of the band-shaped material extends on the second flat surface (5), and the other edge is formed stepped on the inner surface by the thickness thereof, and the leading edge is formed.
  • the flat tube of the present invention is configured as described above and has the following effects.
  • the core material 1 is made of aluminum in which a sacrificial anode material 2 is coated on the inner surface side and a brazing material 3 is coated on the outer surface side, and both edges of the band-shaped material at the seam 8 are the inner surface of the tube.
  • the edge is separated from the second flat surface 5 while being bent to the side. Therefore, the brazing material melted during brazing is prevented from adhering to the sacrificial anode material 2 on the inner surface of the second flat surface 5, and the inner surface corrosion due to the adhesion is prevented, so that a highly reliable flat tube can be provided. Can be provided.
  • the brazing pool 9 that has fallen in the vicinity of the tip of both edges can be provided.
  • the presence of the brazing pool 9 causes the molten brazing material to pass through the brazing pool.
  • the attachment of the brazing material to the sacrificial anode material 2 can be prevented more reliably.
  • both edges in the width direction are bent perpendicular to the second flat surface 5 to form leg portions 13, and further, the leading edge thereof is bent and bent shorter than the leg portions 13, and the folded portion is formed. The edge can be brought into contact with the top of the partition 7. Also in this case, since the folded portion is shorter than the leg portion 13, the molten brazing material is prevented from reaching the sacrificial anode material 2 of the second flat surface 5, and a flat tube with high durability can be provided.
  • both edge portions of the strip are bent at right angles to the second flat surface 5 to form the leg portions 13, and the tip portions are bent substantially parallel to the second flat surface 5,
  • the bent edge can be brought into contact with the top of the partition 7.
  • the presence of the legs 13 further prevents the brazing material from adhering to the sacrificial anode material 2 on the second flat surface 5 when the brazing material is melted, thereby providing a highly reliable flat tube.
  • both edges in the width direction of the band-shaped material are overlapped, one side is formed in a stepped shape by the thickness of the plate, and the edge is folded back to the middle of the stepped portion, and the folded-over overlapped portion 10 is formed. It can be brought into contact with the top of the partition 7. Also in this case, it is possible to effectively prevent the brazing material from reaching the sacrificial anode material 2 on the second flat surface 5 when the brazing material is melted, and to provide a flat tube having high durability.
  • FIG. 1 is a cross-sectional view of a flat tube according to a first embodiment of the present invention, showing a state before brazing.
  • FIG. 2 is a cross-sectional view of a main part showing a state of the flat tube after brazing.
  • FIG. 3 is a cross-sectional view of a main part showing a flat tube according to a second embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of a main part showing a flat tube according to the third embodiment.
  • FIG. 5 is a cross-sectional view of a main part showing a flat tube according to the fourth embodiment.
  • FIG. 6 is a cross-sectional view of a main part showing a flat tube according to the fifth embodiment.
  • FIG. 7 is a cross-sectional view of a main part showing a flat tube of the sixth embodiment.
  • FIG. 8 is a cross-sectional view of a main part showing a flat tube according to the seventh embodiment.
  • FIG. 9 is a cross-sectional view of a conventional flat tube before brazing.
  • FIG. 10 is a cross-sectional view of a main part showing a state of the flat tube after brazing.
  • FIG. 1 is a cross-sectional view of a flat tube according to a first embodiment of the present invention before brazing
  • FIG. 2 is an explanatory cross-sectional view of main parts after brazing.
  • an aluminum strip is bent in the width direction, and the outer face of an aluminum core 1 is covered with a brazing material 3 made of an aluminum alloy.
  • a sacrificial anode material 2 made of an aluminum alloy is previously covered on the inner surface side.
  • Such a strip is bent in the width direction so that the first flat surface 4 and the second flat surface 5 which are parallel to each other are opposed to each other, and the both sides in the width direction are connected by a pair of curved portions 6.
  • a partitioning portion 7 is formed to be folded back inward at right angles to the first flat surface 4 , and both edges of the band-shaped material are folded back to the inner surface side at the widthwise center position of the second flat surface 5.
  • the umbrella is abutted in the shape of an umbrella, and the top of the partition 7 is in contact with the inner surface of the top of the umbrella.
  • the folded portion is in a non-contact state with the inner surface of the second flat surface 5.
  • a recessed V-shaped solder pool 9 is provided near the tip of the turn.
  • a number of flat tubes having such a cross section are arranged in parallel at regular intervals.
  • fins 11 are arranged between the flat tubes, and the through holes of the header plate (not shown) are fitted into both ends of the flat tube in the longitudinal direction to form a core.
  • Support materials are provided on both sides of the core. Is arranged and the heat exchanger is assembled.
  • the assembled heat exchanger is inserted into the high-temperature furnace, and the brazing material 3 on the outer surface of each flat tube is melted, and then cooled and solidified to form the flat tube joint 8 and the top of the partition 7.
  • each contact portion with the fin 11 and others are brazed.
  • the filter material exposed on the inner surface side of the tube has no gap between the folded portion and the inner surface of the second flat surface 5, so that the brazing material does not adhere to the sacrificial anode material 2.
  • the brazing material 9 is held there by the presence of the brazing material 9, and effectively prevents the brazing material from moving to the sacrificial anode material 2 side.
  • FIG. 3 shows a flat tube according to a second embodiment of the present invention, which is different from that of FIG. 1 in that the angle between the bent portion 1 and the second flat surface 5 is larger. It is an octopus. Thereby, it is possible to more effectively prevent the brazing material 3 from adhering to the inner surface side of the second flat surface 5 when the brazing material is melted.
  • FIG. 4 shows a flat tube according to a third embodiment of the present invention.
  • the bent portion 14 of the seam portion 8 is located on the second flat surface 5 and 18. It is folded back to 0 °, and then its tip edge is inclined toward the inner surface so as to be separated from the inner surface of the second flat surface 5. By doing so, it is possible to prevent the brazing material from adhering to the inner side of the second flat surface 5 when the brazing material is melted.
  • FIG. 5 shows a flat tube according to a fourth embodiment of the present invention.
  • a strip material is bent at a seam 8 at a right angle to the second flat surface 5, and there A pair of legs 13 are arranged in contact with each other, and the ends thereof are shorter than the length of the legs 13 and further folded back.
  • the second flat It does not reach the inner side of the flat surface 5.
  • FIG. 6 shows a flat tube according to a fifth embodiment of the present invention, which is different from that of FIG. 5 in that the tip of the leg 13 is parallel to the second flat surface 5. It was bent. The bent edge portion comes into contact with the partition portion 7. Also in this example, when the brazing material is melted, it does not adhere to the sacrificial anode material 2 on the inner side of the second flat surface 5.
  • FIG. 7 shows a flat tube according to a sixth embodiment of the present invention.
  • one edge of the strip extends on the plane of the second flat surface 5, and The edge is formed with a step by the thickness of the plate, the edge is further bent by 180 °, and the length of the folded portion is shorter than the step.
  • the overlapping portion 10 comes into contact with the top of the partition 7.
  • the brazed portion of the seam on the second flat surface 5 is formed in three layers, and the portion is more resistant to corrosion. '
  • FIG. 8 shows a flat tube according to a seventh embodiment of the present invention.
  • one edge of the strip is formed in a stepped shape having a thickness twice as large as the plate thickness, and The edge is folded back at 180 ° and the edge is bent away from the inner surface of the second flat surface 5.
  • Cuts 12 are formed at appropriate intervals at the top of the partition 7, from which the filter medium 3 on the outer surface side of the partition 7 flows out, and a power-type bent portion at one edge of the second flat surface 5. 15 and the top of the partition 7 are brazed.
  • both edges of the strip are brazed to each other by a brazing material coated on their outer surfaces.

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

Abstract

A flat tube for an aluminum heat exchanger formed by laterally bending and folding an aluminum band-shaped material, in which a sacrificial anode material (2) is applied to the inner surface of a core material (1) and a brazing filler metal (3) is applied to the outer surface thereof so that its cross section can be formed in a generally B-shape. To increase the corrosive resistance of the inner surface side of the flat tube, both lateral edge parts of the band-shaped material are bent and folded to the inner surface side of the tube so that the edge parts are separated from the flat inner surface of the tube.

Description

明 細 書 アルミニューム製熱交換器用偏平チューブ  Description Flat tube for aluminum heat exchanger
技術分野 Technical field
本発明は、 アルミニューム製熱交換器用偏平チューブであって、 その断面が B字状 に曲折されたものであり且つ、 外面側にろう材が被覆されたものに関する。 背景技術  TECHNICAL FIELD The present invention relates to a flat tube for an aluminum heat exchanger, the cross section of which is bent in a B-shape, and the outer surface of which is coated with a brazing material. Background art
横断面が偏平な略 B字状に形成されたアルミニューム製熱交換器用偏平チューブ は、 図 9の如く、 その幅方向中央に仕切部 7が立ち上げられ、 その頂部が曲折された 帯状材の継目部 8に接続されたものである。 その継目部 8には、 帯状材の両縁部が 1 8 0 ° 折り返されて内面側にろう材 3を露出し、そのろう材 3と仕切部 7の頂部とが 接触されている。  As shown in Fig. 9, a flat tube for an aluminum heat exchanger, whose cross section is formed in a substantially B-shape, has a partition 7 at the center in the width direction and a bent top at the top. It is connected to seam 8. At the joint portion 8, both edges of the band-shaped material are folded back by 180 ° to expose the brazing material 3 on the inner surface side, and the brazing material 3 and the top of the partition 7 are in contact with each other.
このような偏平チューブを高温の炉内に挿入し、 ろう材 3を溶融させ、 次いでそれ を冷却固化すると図 1 0の如く、仕切部 7の頂部と継目部 8との間がろう材 3により ろう付け固定されるものである。 また、 このとき同時にフィン 11および図示しない チューブプレートとの間も一体にろう付け固定される。 （例えば、 米国特許第 5 7 6 5 6 3 4号明細書参照。）。  By inserting such a flat tube into a high-temperature furnace to melt the brazing material 3 and then cooling and solidifying it, the brazing material 3 fills the gap between the top of the partition 7 and the seam 8 as shown in Fig. 10. It is fixed by brazing. At this time, the fin 11 and the tube plate (not shown) are also integrally brazed and fixed. (See, for example, US Pat. No. 5,756,634.)
上記の B型偏平チューブは、 仕切部 7の存在により耐圧性が高い特徴がある。 しかしながら、チューブ内面側の耐蝕性に欠ける欠点があることが判った。例えば、 ラジェータにおいては、チューブ内面側にアルミニューム合金からなる犠牲陽極材を 被覆し、 耐蝕性を高めるものが知られている。 ところが、 チューブ外面側のろう材を 用いて仕切部 7とろう付けするため、その帯状材の幅方向両縁部を内面側に折り返す と、 ろう材の溶融時にそのろう.材 3が図 1 0の如く折り返し端縁に保持され、 それが 犠牲陽極材に触れ、 その触れた部分に腐蝕が進行し易くなることが判った。 The B-type flat tube described above is characterized by high pressure resistance due to the presence of the partition 7. However, it was found that there was a defect that the inner surface of the tube lacked corrosion resistance. For example, in the case of a radiator, there is known a radiator in which a sacrificial anode material made of an aluminum alloy is coated on an inner surface side of a tube to improve corrosion resistance. However, the brazing material on the outer surface of the tube When the brazing material is turned back, the widthwise edges of the strip are folded back toward the inner surface, and the brazing material is retained at the folded edges as shown in Fig. 10 when the brazing material is melted. It came into contact with the sacrificial anode material, and it was found that corrosion easily progressed to the touched part.
その理由は、 次の通りである。  The reasons are as follows.
これは犠牲陽極材 2にろう材 3が付着し加熱されると、犠牲陽極材 2とろう材 3と によりそこに新たなアルミニューム合金が生じ、その新たなアルミニューム合金の電 位が芯材の電位に近くなるため、犠牲陽極効果が極めて弱くなり、 そこが集中的に腐 蝕するためである。  This is because when the brazing material 3 adheres to the sacrificial anode material 2 and is heated, the sacrificial anode material 2 and the brazing material 3 form a new aluminum alloy there, and the potential of the new aluminum alloy becomes the core material. This is because the sacrificial anode effect becomes extremely weak because of the potential approaching, and the corrosion is concentrated there.
そこで本発明は、 このような内面腐蝕の問題を解決する B型偏平チューブを提供す ることを媒題とする。 発明の開示  Therefore, an object of the present invention is to provide a B-type flat tube that solves such a problem of inner surface corrosion. Disclosure of the invention
請求項 1に記載の本発明は、芯材 (1) の内面側に犠牲陽極材 (2) が被覆されると共 に、外面側にろう材 (3) が被覆されたアルミニューム製の帯状材を幅方向に曲折して、 互いに平行に対向する一対の第一の平坦面 (4) と第二の平坦面 (5) と、  The present invention according to claim 1 is an aluminum strip having a core material (1) coated on the inner surface side with a sacrificial anode material (2) and an outer surface side coated with a brazing material (3). The material is bent in the width direction, and a pair of first flat surfaces (4) and second flat surfaces (5) facing each other in parallel,
両平坦面 (4) (5)の幅方向両側間を連結する一対の湾曲部（6) と、  A pair of curved portions (6) connecting between both widthwise sides of the flat surfaces (4) and (5);
第一の平坦面（4) の幅方向中央に内側へそれに直交して折り返して立ち上げられ た仕切部 (7) と、 A partition portion (7) which is turned up inward at the center in the width direction of the first flat surface ( 4 ) and orthogonally to the first flat surface ( 4 );
第二の平坦面（5) の幅方向中央位置で前記帯状材の両縁部どうしが折り曲げられ て突き合わされると共に、 その折り曲げ縁部が前記仕切部（7) に接続された継目部 (8) と、  At the center in the width direction of the second flat surface (5), both edges of the strip are bent and abutted, and the bent edge is connected to the partition (7). ) When,
を有して横断面が偏平な略 B字状にされたアルミ-ユーム製熱交換器用偏平チュ ーブにおいて、 前記帯状材の幅方向両縁部がチューブ内面側に曲折されると共に、その縁が前記第 二の平坦面（5) の内面から離反されたアルミニューム製熱交換器用偏平チューブで める。 In a flat tube for an aluminum-Yume heat exchanger having a substantially B-shaped cross section with a flat cross section, Both ends in the width direction of the strip are bent toward the inner surface of the tube, and the edges are separated from the inner surface of the second flat surface (5) by a flat tube for an aluminum heat exchanger.
請求項 2に記載の本発明は、 請求項 1において、  The present invention described in claim 2 is based on claim 1,
前記幅方向両縁部が断面傘状に突き合わされるように形成され、その傘の頂部内面 に前記仕切部（7) の頂部が接触されたアルミュユーム製熱交換器用偏平チューブで ある。  It is a flat tube for a heat exchanger made of Arumüm in which both edges in the width direction are formed to abut against each other in an umbrella-shaped cross section, and the top of the partition (7) is in contact with the inner surface of the top of the umbrella.
請求項 3に記載の本発明は、 請求項 2において、  The present invention described in claim 3 is based on claim 2,
前記両縁部の先端近傍に、凹陥したろう溜まり（9) が設けられたアルミニューム製 熱交換器用偏平チューブである。  A flat tube for an aluminum heat exchanger provided with a recessed solder pool (9) near the front ends of the both edge portions.
請求項 4に記載の本発明は、 請求項 1において、  The present invention described in claim 4 is based on claim 1,
前記幅方向両縁部が第二の平坦面（5) に直交して折り曲げられた脚部（13)を有す ると共に、 その先端縁が脚部（13)より短くその第二の平坦面 (5) 側に折り返され、 そ の折り返し端縁が前記仕切部（7) の頂部に接触されたアルミ二ユーム製熱交換器用 偏平チューブである。  Both edges in the width direction have legs (13) bent at right angles to the second flat surface (5), and the leading edge is shorter than the legs (13), and the second flat surface is formed. A flat tube for a heat exchanger made of aluminum, which is folded back to the side (5) and whose folded edge is in contact with the top of the partition (7).
請求項 5に記載の本発明は、 請求項 1において、  The present invention described in claim 5 is based on claim 1,
前記幅方向両縁部が第二の平坦面 (5) に直交して折り曲げられた脚部（13)を有す ると共に、 その先端縁がその第二の平坦面 (5) にほぼ平行に折り曲げられ、 その折り 曲げ縁部が前記仕切部（7) の頂部に接触されたアルミニューム製熱交換器用偏平チ ユーブである。  Both edges in the width direction have legs (13) bent at right angles to the second flat surface (5), and their leading edges are substantially parallel to the second flat surface (5). This is a flat tube for an aluminum heat exchanger, which is bent and the bent edge of which is in contact with the top of the partition (7).
請求項 6に記載の本発明は、芯材 (1) の内面側に犠牲陽極材 (2) が被覆されると共 に、外面側にろう材 (3) が被覆されたアルミニューム製の帯状材を幅方向に曲折して、 互いに平行に対向された第一の平坦面 (4) と第二の平坦面 (5) と、 両平坦面 (4) (5)の幅方向両側間を連結する一対の湾曲部 (6) と、 第一の平坦面 (4) の幅方向中央に内側へそれに直交して折り返して立ち上げられ た仕切部 (7) と、 The present invention according to claim 6 is an aluminum strip having a core material (1) coated with a sacrificial anode material (2) on the inner surface side and a brazing material (3) coated on the outer surface side. A first flat surface (4) and a second flat surface (5) which are bent in the width direction and are opposed to each other in parallel with each other; And both the flat surface (4) a pair of curved portion connecting between both sides in the width direction of the (5) (6), is raised by folding perpendicular thereto inward in the widthwise center of the first flat surface (4) Partition (7),
第二の平坦面（5) の幅方向中央位置で前記帯状材の両縁部どうしが重ね合わされ ると共に、 その重ね合わせ部が前記仕切部（7) に接続されて、横断面が偏平な略 B字 状にされたアルミニューム製熱交換器用偏平チューブにおいて、  At the center in the width direction of the second flat surface (5), both edges of the strip are overlapped with each other, and the overlapped portion is connected to the partition (7), and the cross section is substantially flat. In a B-shaped aluminum heat exchanger flat tube,
前記帯状材の幅方向一方の縁部が前記第二の平坦面 (5) 上に延在すると共に、他方 の縁部が内面側にその板厚分だけ段付きに形成され且つ、その先端縁が前記段付きの 中間まで折り返され、その折り返しの重ね合わせ部（10)が前記仕切部（7) の頂部に接 触されたアルミニューム製熱交換器用偏平チューブである。  One edge in the width direction of the band-shaped material extends on the second flat surface (5), and the other edge is formed stepped on the inner surface by the thickness thereof, and the leading edge is formed. Is a flat tube for an aluminum heat exchanger in which the folded portion (10) is folded back to the middle of the step and the folded portion (10) is in contact with the top of the partition portion (7).
本発明の偏平チューブは以上のような構成からなり、 次の効果を有する。  The flat tube of the present invention is configured as described above and has the following effects.
即ち、芯材 1の内面側に犠牲陽極材 2が被覆され、外面側にろう材 3が被覆された アルミニューム製のものであって、その継目部 8における帯状材の両縁部がチューブ 内面側に曲折されると共に、 その縁が第二の平坦面 5から離反されたものである。 そ のため、 ろう付け時に溶融したろう材が第二の平坦面 5の内面の犠牲陽極材 2に付着 することを防止し、その付着に基づく内面腐蝕を防止して信頼性の高い偏平チューブ を提供できる。  That is, the core material 1 is made of aluminum in which a sacrificial anode material 2 is coated on the inner surface side and a brazing material 3 is coated on the outer surface side, and both edges of the band-shaped material at the seam 8 are the inner surface of the tube. The edge is separated from the second flat surface 5 while being bent to the side. Therefore, the brazing material melted during brazing is prevented from adhering to the sacrificial anode material 2 on the inner surface of the second flat surface 5, and the inner surface corrosion due to the adhesion is prevented, so that a highly reliable flat tube can be provided. Can be provided.
上記構成において、材料となる帯状材の幅方向両縁部を断面傘状になるように突き 合わせ形成し、その傘の頂部内面に仕切部 7の頂部を接触させて偏平チューブを構成 することができる。 この場合には、成形が容易で且つ内面側の耐蝕性の高いものとな り得る。  In the above configuration, it is possible to form a flat tube by abutting the width-direction edges of the band-shaped material as a material so as to have an umbrella-shaped cross section, and bringing the top of the partition 7 into contact with the inner surface of the top of the umbrella. it can. In this case, molding can be easily performed and the inner surface side can have high corrosion resistance.
上記構成において、その両縁部の先端近傍に la陥したろう溜まり 9を設けることが できる。 その場合には、 ろう溜まり 9の存在により、 溶融したろう材をそのろう溜ま り 9に保持して、 犠牲陽極材 2にろう材が付着することをより確実に防止できる。 上記第 1の発明において、幅方向両縁部を第二の平坦面 5に直交して折り曲げそこ に脚部 13を形成し、 さらにその先端縁を脚部 13より短く折り返し曲折し、 その折り 返し端縁部を仕切部 7の頂部に接触させることができる。 この場合にも、 折り返し部 が脚部 13より短いため、 溶融したろう材が第二の平坦面 5の犠牲陽極材 2まで達す ることを防止し、 耐久性の高い偏平チューブを提供できる。 In the above-described configuration, the brazing pool 9 that has fallen in the vicinity of the tip of both edges can be provided. In such a case, the presence of the brazing pool 9 causes the molten brazing material to pass through the brazing pool. 9, the attachment of the brazing material to the sacrificial anode material 2 can be prevented more reliably. In the first invention, both edges in the width direction are bent perpendicular to the second flat surface 5 to form leg portions 13, and further, the leading edge thereof is bent and bent shorter than the leg portions 13, and the folded portion is formed. The edge can be brought into contact with the top of the partition 7. Also in this case, since the folded portion is shorter than the leg portion 13, the molten brazing material is prevented from reaching the sacrificial anode material 2 of the second flat surface 5, and a flat tube with high durability can be provided.
上記第 1の発明において、帯状材の両端縁部を第二の平坦面 5に直角に折り曲げて 脚部 13を形成し、 その先端部を第二の平坦面 5にほぼ平行に折り曲げ、 その折り曲 げ縁部を仕切部 7の頂部に接触させることができる。 この場合には、 脚部 13の存在 により、 ろう材溶融時にそれが第二の平坦面 5の犠牲陽極材 2に付着することをさら に防止し、 信頼性の高い偏平チューブを提供できる。  In the first invention, both edge portions of the strip are bent at right angles to the second flat surface 5 to form the leg portions 13, and the tip portions are bent substantially parallel to the second flat surface 5, The bent edge can be brought into contact with the top of the partition 7. In this case, the presence of the legs 13 further prevents the brazing material from adhering to the sacrificial anode material 2 on the second flat surface 5 when the brazing material is melted, thereby providing a highly reliable flat tube.
また、 帯状材の幅方向両縁部を重ね合わせると共に、 一方側を板厚分だけ段付き状 に形成し、 さらにその端縁を段付き部の中間まで折り返し、 その折り返しの重ね合わ せ部 10を仕切部 7の頂部に接触させることができる。 この場合にも、 ろう材の溶融 時に第二の平坦面 5の犠牲陽極材 2までろう材が達することを有効に防止し、耐久性 の高い偏平チューブを提供できる。 図面の簡単な説明  Also, both edges in the width direction of the band-shaped material are overlapped, one side is formed in a stepped shape by the thickness of the plate, and the edge is folded back to the middle of the stepped portion, and the folded-over overlapped portion 10 is formed. It can be brought into contact with the top of the partition 7. Also in this case, it is possible to effectively prevent the brazing material from reaching the sacrificial anode material 2 on the second flat surface 5 when the brazing material is melted, and to provide a flat tube having high durability. BRIEF DESCRIPTION OF THE FIGURES
図 1は本発明の第 1の実施の形態の偏平チューブであってろう付け前の状態を示 す横断面図である。  FIG. 1 is a cross-sectional view of a flat tube according to a first embodiment of the present invention, showing a state before brazing.
図 2は同偏平チューブのろう付け後の状態を示す要部横断面図である。  FIG. 2 is a cross-sectional view of a main part showing a state of the flat tube after brazing.
図 3は本発明の第 2の実施の形態の偏平チューブを示す要部横断面図である。 図 4は同第 3の実施の形態の偏平チューブを示す要部横断面図である。 図 5は同第 4の実施の形態の偏平チューブを示す要部横断面図である。 FIG. 3 is a cross-sectional view of a main part showing a flat tube according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view of a main part showing a flat tube according to the third embodiment. FIG. 5 is a cross-sectional view of a main part showing a flat tube according to the fourth embodiment.
図 6は同第 5の実施の形態の偏平チューブを示す要部横断面図である。 . 図 7は同第 6の実施の形態の偏平チューブを示す要部横断面図である。  FIG. 6 is a cross-sectional view of a main part showing a flat tube according to the fifth embodiment. FIG. 7 is a cross-sectional view of a main part showing a flat tube of the sixth embodiment.
図 8は同第 7の実施の形態の偏平チューブを示す要部横断面図である。  FIG. 8 is a cross-sectional view of a main part showing a flat tube according to the seventh embodiment.
図 9は従来型偏平チューブであってろう付け前の状態を示す横断面図である。  FIG. 9 is a cross-sectional view of a conventional flat tube before brazing.
図 1 0は同偏平チューブのろう付け後の状態を示す要部横断面図である。 発明を実施するた.めの最良の形態  FIG. 10 is a cross-sectional view of a main part showing a state of the flat tube after brazing. BEST MODE FOR CARRYING OUT THE INVENTION
次に、 図面に基づいて本発明の各実施の形態につき説明する。  Next, embodiments of the present invention will be described with reference to the drawings.
図 1は本発明の第 1の実施の形態を示す偏平チューブであってろう付け前の横断 面図であり、 図 2はそのろう付け後の要部横断説明図である。  FIG. 1 is a cross-sectional view of a flat tube according to a first embodiment of the present invention before brazing, and FIG. 2 is an explanatory cross-sectional view of main parts after brazing.
この例は、 アルミニューム製の帯状材を幅方向に曲折して形成したものであり、 そ の帯状材はアルミニユームの芯材 1の外面側にアルミニューム合金からなるろう材 3が被覆されると共に、内面側にアルミニューム合金からなる犠牲陽極材 2が予め被 覆されたものである。  In this example, an aluminum strip is bent in the width direction, and the outer face of an aluminum core 1 is covered with a brazing material 3 made of an aluminum alloy. A sacrificial anode material 2 made of an aluminum alloy is previously covered on the inner surface side.
このような帯状材を幅方向に曲折して、互いに平行な第一の平坦面 4と第二の平坦 面 5とが対向され、 それらの幅方向両側部間が一対の湾曲部 6で連結される。 さらに 第一の平坦面 4の幅方向中央に、内側へそれに直交して仕切部 7が折り返し形成され、 第二の平坦面 5の幅方向中央位置で帯状材の両縁部が内面側に折り返されて断面傘 状に突き合わされ、 その傘の頂部内面に仕切部 7の頂部が接触されたものである。 そ して折り返された部分は、 第二の平坦面 5の内面に非接触状態にある。 さらに折り返 しの先端近傍には、 凹陥した断面 V字状のろう溜まり 9が設けられている。 Such a strip is bent in the width direction so that the first flat surface 4 and the second flat surface 5 which are parallel to each other are opposed to each other, and the both sides in the width direction are connected by a pair of curved portions 6. You. Further, at the center in the width direction of the first flat surface 4 , a partitioning portion 7 is formed to be folded back inward at right angles to the first flat surface 4 , and both edges of the band-shaped material are folded back to the inner surface side at the widthwise center position of the second flat surface 5. The umbrella is abutted in the shape of an umbrella, and the top of the partition 7 is in contact with the inner surface of the top of the umbrella. The folded portion is in a non-contact state with the inner surface of the second flat surface 5. Further, near the tip of the turn, a recessed V-shaped solder pool 9 is provided.
このような断面を有する多数の偏平チューブが、 定間隔に並列され、 各偏平チュー ブ間に図 2の如くフィン 11が配置され、 偏平チューブの長手方向両端には図示しな いヘッダプレートのチューブ揷通孔が嵌着されてコアを構成し、そのコアの両側にサ ポート材が配置され熱交換器が組立てられる。 A number of flat tubes having such a cross section are arranged in parallel at regular intervals. As shown in Fig. 2, fins 11 are arranged between the flat tubes, and the through holes of the header plate (not shown) are fitted into both ends of the flat tube in the longitudinal direction to form a core. Support materials are provided on both sides of the core. Is arranged and the heat exchanger is assembled.
そして、組み立てられた熱交換器が高温の炉内に挿入され、 各偏平チューブ外面の ろう材 3を溶融し、次いでそれを冷却固化することにより偏平チューブの継目部 8お よび仕切部 7の頂部並びにフィン 11との各接触部その他をろう付けするものである。 このときチューブ内面側に露出されたろぅ材は、折り返し部と第二の平坦面 5の内面 との間に隙間が存在するため、 犠牲陽極材 2にろう材が付着することがない。 また、 ろう溜まり 9の存在によりそこにろう材 3が保持され、犠牲陽極材 2側にろう材が移 動することをより効果的に防止する。  Then, the assembled heat exchanger is inserted into the high-temperature furnace, and the brazing material 3 on the outer surface of each flat tube is melted, and then cooled and solidified to form the flat tube joint 8 and the top of the partition 7. In addition, each contact portion with the fin 11 and others are brazed. At this time, the filter material exposed on the inner surface side of the tube has no gap between the folded portion and the inner surface of the second flat surface 5, so that the brazing material does not adhere to the sacrificial anode material 2. In addition, the brazing material 9 is held there by the presence of the brazing material 9, and effectively prevents the brazing material from moving to the sacrificial anode material 2 side.
次に、 図 3は本発明の第 2の実施の形態を示す偏平チューブであって、 図 1のそれ と異なる点は、 折り曲げ部 1 と第二の平坦面 5との角度がより大きく形成されたこ とである。 それによつて、 ろう材溶融時にそのろう材 3が第二の平坦面 5の内面側に 付着することをより効果的に防止できるものである。  Next, FIG. 3 shows a flat tube according to a second embodiment of the present invention, which is different from that of FIG. 1 in that the angle between the bent portion 1 and the second flat surface 5 is larger. It is an octopus. Thereby, it is possible to more effectively prevent the brazing material 3 from adhering to the inner surface side of the second flat surface 5 when the brazing material is melted.
次に、 図 4は本発明の第 3の実施の形態を示す偏平チューブであって、 この例は継 目部 8の折り曲げ部 14が第二の平坦面 5に対して、 ー且、 1 8 0 ° に折り返され、 次いで、その先端縁が第二の平坦面 5の内面から離反するように内面側に傾斜された ものである。 このようにすることにより、 ろう材溶融時にそれが第二の平坦面 5の内 面側に付着することを防止できる。  Next, FIG. 4 shows a flat tube according to a third embodiment of the present invention. In this example, the bent portion 14 of the seam portion 8 is located on the second flat surface 5 and 18. It is folded back to 0 °, and then its tip edge is inclined toward the inner surface so as to be separated from the inner surface of the second flat surface 5. By doing so, it is possible to prevent the brazing material from adhering to the inner side of the second flat surface 5 when the brazing material is melted.
次に、 図 5は本発明の第 4の実施の形態を示す偏平チューブであって、 この例は帯 状材が継目部 8で第二の平坦面 5に対し直角に折り曲げられて、そこに一対の脚部 13 が接触して配置され、 その先端が脚部 13の長さよりも短くさらに折り返されたもの である。 このようにすることにより、 チューブ外面側のろう材が溶融しても第二の平 坦面 5の内面側にはそれが達しないようにしたものである。 仮に脚部 13にろう材が 僅かに付着しても、 そこの部分はチューブの漏れとは無関係であるため、 耐蝕性に影 響を与えない。 Next, FIG. 5 shows a flat tube according to a fourth embodiment of the present invention. In this example, a strip material is bent at a seam 8 at a right angle to the second flat surface 5, and there A pair of legs 13 are arranged in contact with each other, and the ends thereof are shorter than the length of the legs 13 and further folded back. In this way, even if the brazing material on the outer surface of the tube melts, the second flat It does not reach the inner side of the flat surface 5. Even if a small amount of brazing material adheres to the leg portion 13, it does not affect the corrosion resistance because that portion is not related to the leakage of the tube.
次に、 図 6は本発明の第 5の実施の形態を示す偏平チューブであって、 この例が図 5のそれと異なる点は、 脚部 13の先端部が第二の平坦面 5に平行に折り曲げられた ことである。 そしてその折り曲げ縁部が仕切部 7に接触したものである。 この例も、 ろう材溶融時にそれが第二の平坦面 5の内面側の犠牲陽極材 2に付着するとこがな い。  Next, FIG. 6 shows a flat tube according to a fifth embodiment of the present invention, which is different from that of FIG. 5 in that the tip of the leg 13 is parallel to the second flat surface 5. It was bent. The bent edge portion comes into contact with the partition portion 7. Also in this example, when the brazing material is melted, it does not adhere to the sacrificial anode material 2 on the inner side of the second flat surface 5.
次に、 図 7は本発明の第 6の実施の形態を示す偏平チューブであって、 この例は帯 状材の一方の縁が第二の平坦面 5の平面上に延在し、他方の縁が板厚分だけ段付きに 形成され、 その縁部がさらに 1 8 0 ° 曲折され、 その折り返し部の長さが段付きより 短く形成されたものである。 そしてその重ね合わせ部 10が仕切部 7の頂部に接触す るものである。 この場合、 第二の平坦面 5における継目のろう付け部は三重に形成さ れ、 その分だけ腐蝕に強いものとなる。 '  Next, FIG. 7 shows a flat tube according to a sixth embodiment of the present invention. In this example, one edge of the strip extends on the plane of the second flat surface 5, and The edge is formed with a step by the thickness of the plate, the edge is further bent by 180 °, and the length of the folded portion is shorter than the step. The overlapping portion 10 comes into contact with the top of the partition 7. In this case, the brazed portion of the seam on the second flat surface 5 is formed in three layers, and the portion is more resistant to corrosion. '
次に、 図 8は本発明の第 7の実施の形態を示す偏平チューブであって、 この例は帯 状材の一方の縁部が板厚の 2倍の段付き状に形成され、他方の縁部が 1 8 0 ° 折り返 されると共に、その縁が第二の平坦面 5の内面から離反するように曲折されたもので ある。 そして仕切部 7の頂部に適宜間隔で切れ目 12が形成され、 そこから仕切部 7 の外面側のろぅ材 3が流出し、 第二の平坦面 5の一方の縁部の力ギ型折り曲げ部 15 と仕切部 7の頂部とがろう付けされる。 また、 帯状材の両縁部は、 それらの外面側に 被覆されたろう材により互いにろう付けされる。  Next, FIG. 8 shows a flat tube according to a seventh embodiment of the present invention. In this example, one edge of the strip is formed in a stepped shape having a thickness twice as large as the plate thickness, and The edge is folded back at 180 ° and the edge is bent away from the inner surface of the second flat surface 5. Cuts 12 are formed at appropriate intervals at the top of the partition 7, from which the filter medium 3 on the outer surface side of the partition 7 flows out, and a power-type bent portion at one edge of the second flat surface 5. 15 and the top of the partition 7 are brazed. Also, both edges of the strip are brazed to each other by a brazing material coated on their outer surfaces.

Claims

請 求 の 範 囲 The scope of the claims
1 . 芯材 (1) の内面側に犠牲陽極材 (2) が被覆されると共に、 外面側にろう材 (3) が 被覆されたアルミニューム製の帯状材を幅方向に曲折して、互いに平行に対向する一 対の第一の平坦面 (4) と第二の平坦面 (5) と、  1. A sacrificial anode material (2) is coated on the inner surface side of the core material (1), and an aluminum band material coated on the outer surface side with a brazing material (3) is bent in the width direction so as to be mutually separated. A pair of parallel opposing first flat surfaces (4) and a second flat surface (5);
両平坦面 (4) (5)の幅方向両側間を連結する一対の湾曲部（6) と、  A pair of curved portions (6) connecting between both widthwise sides of the flat surfaces (4) and (5);
第一の平坦面（4) の幅方向中央に内側へそれに直交して折り返して立ち上げられ た仕切部（7) と、  A partition portion (7) which is folded inward at the center in the width direction of the first flat surface (4) inward and perpendicular thereto, and
第二の平坦面（5) の幅方向中央位置で前記帯状材の両縁部どうしが折り曲げられ て突き合わされると共に、 その折り曲げ縁部が前記仕切部（7) に接続された継目部 (8) と、  At the center in the width direction of the second flat surface (5), both edges of the strip are bent and abutted, and the bent edge is connected to the partition (7). ) When,
を有して横断面が偏平な略 B字状にされたアルミニューム製熱交換器用偏平チュ ーブにおいて、  In a flat tube for an aluminum heat exchanger having a substantially B-shaped cross section with a flat cross section,
前記帯状材の幅方向両縁部がチューブ内面側に曲折されると共に、その縁が前記第 二の平坦面（5) の内面から離反されたアルミニューム製熱交換器用偏平チューブ。  A flat tube for an aluminum heat exchanger, wherein both edges in the width direction of the strip are bent toward the inner surface of the tube, and the edges are separated from the inner surface of the second flat surface (5).
2 . 請求項 1において、 2. In Claim 1,
前記幅方向両縁部が断面傘状に突き合わされるように形成され、その傘の頂部内面 に前記仕切部（7) の頂部が接触されたアルミニューム製熱交換器用偏平チューブ。 A flat tube for an aluminum heat exchanger in which both edges in the width direction are formed so as to abut each other in an umbrella-shaped section, and the top of the partition (7) is in contact with the inner surface of the top of the umbrella.
3 . 請求項 2において、 3. In Claim 2,
前記両縁部の先端近傍に、凹陥したろう溜まり（9) が設けられたアルミニューム製 熱交換器用偏平チューブ。  A flat tube for an aluminum heat exchanger, wherein a concave solder pool (9) is provided in the vicinity of the tip of the both edges.
4 . 請求項 1において、  4. In claim 1,
前記幅方向両縁部が第二の平坦面（5) に直交して折り曲げられた脚部（13)を有す ると共に、 その先端縁が脚部（13)より短くその第二の平坦面 (5) 側に折り返され、 そ の折り返し端縁が前記仕切部（7) の頂部に接触されたアルミニューム製熱交換器用 偏平チューブ。 Both edges in the width direction have legs (13) bent at right angles to the second flat surface (5), and the leading edge is shorter than the legs (13), and the second flat surface is formed. (5) A flat tube for an aluminum heat exchanger, the folded edge of which is in contact with the top of the partition (7).
5 . 請求項 1において、  5. In claim 1,
前記幅方向両縁部が第二の平坦面（5) に直交して折り曲げられた脚部（13)を有す ると共に、 その先端縁がその第二の平坦面（5) にほぼ平行に折り曲げられ、 その折り 曲げ縁部が前記仕切部（7) の頂部に接触されたアルミニューム製熱交換器用偏平チ ユーブ。 ' Both edges in the width direction have legs (13) bent at right angles to the second flat surface ( 5 ), and their leading edges are substantially parallel to the second flat surface (5). A flat tube for an aluminum heat exchanger, which is bent and the bent edge of which is in contact with the top of the partition (7). '
6 . 芯材（1) の内面側に犠牲陽極材 (2) が被覆されると共に、 外面側にろう材 (3) が 被覆されたアルミニューム製の帯状材を幅方向に曲折して、互いに平行に対向された 第一の平坦面 (4) と第二の平坦面（5) と、  6. The aluminum strip with the core (1) covered with the sacrificial anode material (2) on the inner surface and the brazing material (3) on the outer surface is bent in the width direction and A first flat surface (4) and a second flat surface (5) opposed in parallel,
両平坦面 (4) (5)の幅方向両側間を連結する一対の湾曲部 (6) と、  A pair of curved portions (6) connecting between both widthwise sides of both flat surfaces (4) and (5);
第一の平坦面（4) の幅方向中央に内側へそれに直交して折り返して立ち上げられ た仕切部 (7) と、 A partition portion (7) which is turned up inward at the center in the width direction of the first flat surface ( 4 ) and orthogonally to the first flat surface ( 4 );
第二の平坦面（5) の幅方向中央位置で前記帯状材の両縁部どうしが重ね合わされ ると共に、 その重ね合わせ部が前記仕切部（7) に接続されて、横断面が偏平な略 B字 状にされたアルミニューム製熱交換器用偏平チューブにおいて、  At the center in the width direction of the second flat surface (5), both edges of the strip are overlapped with each other, and the overlapped portion is connected to the partition (7), and the cross section is substantially flat. In a B-shaped aluminum heat exchanger flat tube,
前記帯状材の幅方向一方の縁部が前記第二の平坦面 (5) 上に延在すると共に、他方 の縁部が内面側にその板厚分だけ段付きに形成され且つ、その先端縁が前記段付きの 中間まで折り返され、その折り返しの重ね合わせ部（10)が前記仕切部（7) の頂部に接 触されたアルミニューム製熱交換器用偏平チューブ。  One edge in the width direction of the band-shaped material extends on the second flat surface (5), and the other edge is formed stepped on the inner surface by the thickness thereof, and the leading edge is formed. Is folded back to the middle of the step, and the folded overlapped portion (10) is in contact with the top of the partition (7).
PCT/JP2004/006236 2003-05-08 2004-04-28 Flat tube for aluminium heat exchanger WO2004099697A1 (en)

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US10/555,155 US20070034366A1 (en) 2003-05-08 2004-04-28 Aluminum flat tube for heat exchanger

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CN1784584A (en) 2006-06-07
CN100398973C (en) 2008-07-02

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