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JP7386789B2 - heat exchanger core - Google Patents

heat exchanger core Download PDF

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Publication number
JP7386789B2
JP7386789B2 JP2020533510A JP2020533510A JP7386789B2 JP 7386789 B2 JP7386789 B2 JP 7386789B2 JP 2020533510 A JP2020533510 A JP 2020533510A JP 2020533510 A JP2020533510 A JP 2020533510A JP 7386789 B2 JP7386789 B2 JP 7386789B2
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flat tube
flat
dimple
heat exchanger
dimples
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JPWO2020027007A1 (en
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孝輔 瀬口
直樹 加藤
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T Rad Co Ltd
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T Rad Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—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
    • 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
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/30—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means being attachable to the element
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation

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

Description

この発明は、偏平チューブとコルゲートフィンからなる熱交換器コアのろう付構造に関する。 The present invention relates to a brazed structure of a heat exchanger core consisting of a flat tube and a corrugated fin.

下記特許文献１に記載の発明には、多数の偏平チューブとコルゲートフィンとを交互に配置してコアを構成し、その両端部にタンクを設けた熱交換器が記載されている。各偏平チューブは一対の開口端部を有し、その偏平チューブの表面には、その表面側から内面側に多数のディンプルが、偏平チューブの開口端を結ぶ軸方向及びその軸方向に直交する方向に千鳥状に配置されている。そして、偏平チューブ内に第１の熱媒体を流通させ、偏平チューブ及びコルゲートフィンの外面側に第２の流通媒体を流通させて、熱交換を行うものである。
この偏平チューブの外面に設けた多数のディンプルは、偏平チューブ内の熱媒体を撹拌し、外面側の流通媒体との間の熱交換を促進させている。
このように、千鳥状にチューブの表面にディンプルを設けた偏平チューブは、その基本構造が図４に示すものとなる。
即ち、図４において、偏平チューブ３は表面側と裏面側とに一対の平面部１が形成され、その平面部１の両側間が端面部２で接続されてなる。平面部１の各表面には、偏平チューブ３の軸方向及びその軸方向に直交する方向に互いに離間して多数のディンプル６が、千鳥状に配置される。そのような多数の偏平チューブ３が互いに平面部１が平行になるように配置され、各偏平チューブ３間にコルゲートフィンが配置されている。
このとき、コルゲートフィンの波の頂部が偏平チューブ３の幅方向に平行に位置する。そして、コルゲートフィンの頂部と偏平チューブ３の平面部１との間が一体にろう付固定される。The invention described in Patent Document 1 below describes a heat exchanger in which a large number of flat tubes and corrugated fins are alternately arranged to constitute a core, and tanks are provided at both ends of the core. Each flat tube has a pair of open ends, and a large number of dimples are formed on the surface of the flat tube from the front side to the inside side in the axial direction connecting the open ends of the flat tube and in the direction perpendicular to the axial direction. are arranged in a staggered manner. Then, a first heat medium is made to flow through the flat tube, and a second heat medium is made to flow around the outer surface of the flat tube and the corrugated fins, thereby performing heat exchange.
A large number of dimples provided on the outer surface of the flat tube stir the heat medium inside the flat tube and promote heat exchange with the circulating medium on the outer surface side.
As described above, the basic structure of the flat tube in which dimples are provided on the surface of the tube in a staggered manner is shown in FIG.
That is, in FIG. 4, the flat tube 3 has a pair of flat parts 1 formed on the front side and the back side, and both sides of the flat part 1 are connected by an end face part 2. On each surface of the flat portion 1, a large number of dimples 6 are arranged in a staggered manner, spaced apart from each other in the axial direction of the flat tube 3 and in a direction orthogonal to the axial direction. A large number of such flat tubes 3 are arranged so that the plane parts 1 are parallel to each other, and corrugated fins are arranged between each flat tube 3.
At this time, the crests of the waves of the corrugated fins are located parallel to the width direction of the flat tube 3. Then, the top part of the corrugated fin and the flat part 1 of the flat tube 3 are fixed together by brazing.

米国特許第８２６７１６３号明細書US Patent No. 8267163

従来技術の図４（Ａ）は、偏平チューブ３の平面部１の表面のディンプル６の配列を示す。また、同図（Ｂ）は、その偏平チューブとコルゲートフィンとのろう付部のろうフィレット７の状態を示したものである。即ち、ろうフィレット７は、波形に形成されたコルゲートフィンの各頂部と偏平チューブ外面との接合部を示し、その接合部は偏平チューブの軸方向に直交する方向に平行に直線上に形成される。同図（Ｂ）において、軸方向に直交する方向に複数のディンプル６が存在する部位とコルゲートフィンの頂部とが重なった場合は、それらのディンプル６の中間のろうフィレット７に部分的な、ろう切れ部８が生じることがある。
図５（Ａ）は複数のディンプル６が存在する部位とコルゲートフィンの頂部とが重なった箇所における、その偏平チューブ３とコルゲートフィン４との接触状態を示したものである。
図５（Ｂ）は、図５（Ａ）において一点鎖線で囲った部分の拡大図であり、偏平チューブ３とコルゲートフィン４とのろう付部の状態を示したものであり、２つのディンプル６の中間の部分に生じたろう切れ部８が示されている。
このろう切れ部８の発生は、炉中ろう付の際、偏平チューブ３とコルゲートフィン４の頂部との間の溶融ろう材がその２つのディンプル６内に引き込まれ、その結果、偏平チューブ３とコルゲートフィン４との接触部のろう材が不足したことに起因する。このようにして、ろう切れ部８が生じると偏平チューブ３とコルゲートフィン４との間の熱抵抗が増加し熱交換性能が低下する。
そこで本発明は、ディンプルを有するチューブとコルゲートフィンから構成される熱交換器コアにおいて、ろう切れ部の生じない、熱交換性能の高い構造の熱交換器コアを提供することを課題とする。FIG. 4A of the prior art shows the arrangement of dimples 6 on the surface of the flat part 1 of the flat tube 3. Further, FIG. 2B shows the state of the solder fillet 7 at the brazed portion between the flat tube and the corrugated fin. That is, the wax fillet 7 indicates the joint between each top of the corrugated fin formed in a corrugated shape and the outer surface of the flat tube, and the joint is formed on a straight line parallel to the direction orthogonal to the axial direction of the flat tube. . In the same figure (B), when a region where a plurality of dimples 6 exist in the direction perpendicular to the axial direction overlaps with the top of the corrugated fin, a partial portion of the wax fillet 7 between the dimples 6 is formed. Cuts 8 may occur.
FIG. 5(A) shows the state of contact between the flat tube 3 and the corrugated fin 4 at a location where a plurality of dimples 6 are present and the top of the corrugated fin overlap.
FIG. 5(B) is an enlarged view of the part surrounded by a dashed line in FIG. A solder break 8 is shown that occurs in the middle of the .
This soldering part 8 occurs because the molten brazing material between the flat tube 3 and the top of the corrugated fin 4 is drawn into the two dimples 6 during furnace brazing, and as a result, the flat tube 3 and the top of the corrugated fin 4 are drawn into the two dimples 6. This is due to insufficient brazing material in the contact area with the corrugated fins 4. In this way, when the solder breakage portion 8 occurs, the thermal resistance between the flat tube 3 and the corrugated fins 4 increases, and the heat exchange performance decreases.
SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchanger core composed of a tube having dimples and corrugated fins, which has a structure in which solder breaks do not occur and the heat exchange performance is high.

請求項１に記載の本発明は、一対の対向する方形の平面部１および両平面部１の端部間を接続する一対の端面部２を有する細長い多数の偏平チューブ３と、前記平面部１が互いに平行に整列された各偏平チューブ間に、それぞれ介装されるコルゲートフィン４と、を具備し、
各コルゲートフィン４は、波形に曲折され、その折返しの各頂部４ａが、偏平チューブ３の平面部１の表面の幅方向に直線的に接合されてなる各熱交換器コア５において、
偏平チューブ３の平面部１には、表面側から内面側に向かって膨出された多数のディンプル６を有して、
各ディンプル６が存在する位置では、平面部１において偏平チューブ３の軸方向に直交する方向にはそれが一つのみ存在し、他のディンプル６が存在しないようにしたことを特徴とする熱交換器コアである。The present invention according to claim 1 includes a plurality of elongated flat tubes 3 having a pair of opposing rectangular plane parts 1 and a pair of end face parts 2 connecting the ends of both the plane parts 1; corrugated fins 4 interposed between the flat tubes arranged parallel to each other,
In each heat exchanger core 5, each corrugated fin 4 is bent into a wave shape, and each folded top part 4a is linearly joined in the width direction of the surface of the flat part 1 of the flat tube 3.
The flat part 1 of the flat tube 3 has a large number of dimples 6 bulging from the surface side toward the inner side,
At the position where each dimple 6 exists, only one dimple exists in the direction orthogonal to the axial direction of the flat tube 3 in the plane part 1, and no other dimples 6 exist. It is a vessel core.

本発明は、各ディンプル６が存在する位置では、平面部１において偏平チューブ３の軸方向に直交する方向にはそれが一つのみ存在し、他のディンプルが存在しないようにしたものである。そのため、コルゲートフィン４の波の頂部４ａに、複数のディンプル６の凹みが位置することがなくなり、偏平チューブ３とコルゲートフィン４との接合不良が生じるおそれが無くなる。
即ち、コルゲートフィン４の波の頂部４ａが、偏平チューブ３の軸方向に直交する方向に直線的に位置し、そこの位置には、ディンプル６が形成する凹みが一つしかないので、複数の凹部が存在する場合のように、二つの凹部がその間のろう材を引張り合うことによる、凹部間の部分的ろう切れを生じることがない。そのため、コルゲートフィン４と偏平チューブ３との接合部に切目のないろうフィレットが形成され、熱交換性能が向上する。In the present invention, in the position where each dimple 6 exists, only one dimple exists in the plane part 1 in the direction orthogonal to the axial direction of the flat tube 3, and no other dimples exist. Therefore, the dents of the plurality of dimples 6 are not located at the wave crests 4a of the corrugated fins 4, and there is no possibility that a bonding failure between the flat tube 3 and the corrugated fins 4 will occur.
That is, the wave crest 4a of the corrugated fin 4 is located linearly in a direction perpendicular to the axial direction of the flat tube 3, and there is only one recess formed by the dimple 6 at that position. Unlike in the case where there are recesses, there is no possibility of partial solder breakage between the recesses due to the two recesses pulling the brazing material between them. Therefore, a continuous wax fillet is formed at the joint between the corrugated fin 4 and the flat tube 3, and heat exchange performance is improved.

図１は本発明の熱交換器コアに用いられる偏平チューブ３の平面図（Ａ）、及び偏平チューブ３とコルゲートフィン４との接続状態を示す斜視図（Ｂ）。
図２は同コアの部分的斜視図。
図３は同偏平チューブ３の平面図（Ａ）、及びＢ－Ｂ断面図（Ｂ）。
図４は従来型偏平チューブ３の平面図（Ａ）、及びそのろう付部の平面図（Ｂ）。
図５は従来型偏平チューブ３とコルゲートフィン４との接触状態を示す説明図（Ａ）、そのろう付後におけるろうフィレットの状態を示す説明図（Ｂ）。FIG. 1 is a plan view (A) of a flat tube 3 used in the heat exchanger core of the present invention, and a perspective view (B) showing a connection state between the flat tube 3 and corrugated fins 4.
FIG. 2 is a partial perspective view of the core.
FIG. 3 is a plan view (A) and a BB sectional view (B) of the flat tube 3.
FIG. 4 is a plan view (A) of a conventional flat tube 3 and a plan view (B) of its brazed portion.
FIG. 5 is an explanatory diagram (A) showing the state of contact between the conventional flat tube 3 and the corrugated fin 4, and an explanatory diagram (B) showing the state of the solder fillet after brazing.

次に、図面に基づいて本発明の実施の形態につき説明する。
図１～図３は本発明の実施の形態を示し、この熱交換器コアは一例として自動車用エンジン冷却水冷却用熱交換器やオイルクーラに適用できるものである。
図１（Ａ）は、そのコアを構成する偏平チューブ３の平面図であり、（Ｂ）は同コアの偏平チューブ３とコルゲートフィン４との接合状態を示す斜視説明図である。また、図２はその熱交換器コア１０の斜視図である。
熱交換器コア１０は、図１及び図２に示す如く、偏平チューブ３とコルゲートフィン４とを交互に並列して、その接触部を互いに一体にろう付したものである。
偏平チューブ３は、図１（Ａ）（Ｂ）に示す如く、対向する一対の平面部１と両平面部１間を接続する一対の端面部２とを有する。そして、その両端が開口している（図２において一方の開口端のみ記載、他端開口は省略している）。
図１（Ｂ）に示すように、一方の端面部２がろう付又は溶接により接合されてチューブの接合部９を形成することができる。
次に、コルゲートフィン４は金属板を波形に曲折したものであり、その波の頂部４ａが偏平チューブ３の平面部１に接触して、その接触部がろう付される。コルゲートフィン４の頂部４ａは、偏平チューブ３の両開口端を結ぶ軸方向Ｓに直交する方向に一直線上に配置されている。
（本発明の特徴）
ここにおいて本発明の特徴は、偏平チューブ３の平面部１には、多数のディンプル６がその表面側から内面側に凹陥されている。それと共に、図３に示す如く、各ディンプル６が存在する位置では、平面部１において偏平チューブ３の軸方向Ｓに直交する方向にはそれが一つのみ存在し、他のディンプル６が存在しないようにしたものである。
そして一例として、偏平チューブ３の平面部１と、コルゲートフィン４の頂部４ａとは、図１（Ａ）に示すろうフィレット７が偏平チューブ３の軸方向Ｓに直交する方向に配置される。
（作用）
図１（Ａ）に示す如く、ろうフィレット７が配置されている線上には、ディンプル６が１つのみ存在する。その結果、そこに二つ存在した図５に示すような、溶融したろうフィレット７の引っ張り合いは生じない。
即ち、図５においては溶融したろう材が各ディンプル６に流入し、それらの間に位置するろうフィレット７を互いに各ディンプル６内に引っ張り込もうとする作用が働いたが、本発明ではディンプル６が一つのみしか存在しないので、ろう材の引っ張り合いが起こらない。そのため、図１（Ａ）に示すように、ろうフィレット７上にディンプル６が存在しても、図４（Ｂ）のようなろう切れ部８が生じることがない。
その結果、偏平チューブ３とコルゲートフィン４とのろう付が各部位おいて確実に行われ、熱交換が促進される。Next, embodiments of the present invention will be described based on the drawings.
1 to 3 show embodiments of the present invention, and this heat exchanger core can be applied to, for example, a heat exchanger for cooling automobile engine coolant or an oil cooler.
FIG. 1(A) is a plan view of a flat tube 3 constituting the core, and FIG. 1(B) is a perspective explanatory view showing a joined state of the flat tube 3 and corrugated fins 4 of the core. Moreover, FIG. 2 is a perspective view of the heat exchanger core 10.
As shown in FIGS. 1 and 2, the heat exchanger core 10 is made up of flat tubes 3 and corrugated fins 4 that are alternately arranged in parallel and their contact portions are integrally brazed to each other.
As shown in FIGS. 1A and 1B, the flat tube 3 has a pair of opposing flat parts 1 and a pair of end faces 2 that connect the flat parts 1. Both ends thereof are open (only one open end is shown in FIG. 2, and the other end is omitted).
As shown in FIG. 1(B), one end surface 2 can be joined by brazing or welding to form a joint 9 of the tube.
Next, the corrugated fin 4 is made by bending a metal plate into a corrugated shape, and the crest 4a of the corrugation contacts the flat portion 1 of the flat tube 3, and the contact portion is brazed. The top portion 4a of the corrugated fin 4 is arranged in a straight line in a direction perpendicular to an axial direction S connecting both open ends of the flat tube 3.
(Features of the present invention)
Here, the feature of the present invention is that a large number of dimples 6 are recessed in the flat part 1 of the flat tube 3 from the front surface side to the inner surface side. At the same time, as shown in FIG. 3, at the position where each dimple 6 exists, only one dimple exists in the plane part 1 in the direction perpendicular to the axial direction S of the flat tube 3, and no other dimples 6 exist. This is how it was done.
As an example, the flat portion 1 of the flat tube 3 and the top portion 4a of the corrugated fin 4 are arranged in a direction in which the wax fillet 7 shown in FIG. 1(A) is orthogonal to the axial direction S of the flat tube 3.
(effect)
As shown in FIG. 1(A), only one dimple 6 exists on the line where the wax fillet 7 is arranged. As a result, the two melted solder fillets 7 do not pull together as shown in FIG. 5, which existed there.
That is, in FIG. 5, the molten brazing filler metal flows into each dimple 6 and acts to pull the fillets 7 located between them into each dimple 6, but in the present invention, the dimple 6 Since there is only one, there is no tension between the brazing filler metals. Therefore, even if the dimple 6 is present on the solder fillet 7 as shown in FIG. 1(A), the solder cut portion 8 as shown in FIG. 4(B) does not occur.
As a result, the flat tube 3 and the corrugated fins 4 are reliably brazed at each location, and heat exchange is promoted.

偏平チューブとコルゲートフィンとのろう付部を有する熱交換器コアであって、自動車用ラジエータ、空調用熱交換器、オイルクーラその他に利用できる。 This is a heat exchanger core having a brazed portion between a flat tube and a corrugated fin, and can be used for automobile radiators, air conditioning heat exchangers, oil coolers, and others.

１ 平面部
２ 端面部
３ 偏平チューブ
４ コルゲートフィン
４ａ 頂部
５ 熱交換器コア
６ ディンプル
７ ろうフィレット
８ ろう切れ部
９ 接合部
１０ 熱交換器コア
Ｓ 軸方向1 Plane part 2 End face part 3 Flat tube 4 Corrugated fin 4a Top part 5 Heat exchanger core 6 Dimple 7 Wax fillet 8 Braze cut part 9 Joint part 10 Heat exchanger core S Axial direction

Claims (1)

一対の対向する方形の平面部（１）および両平面部（１）の端部間を接続する一対の端面部（２）を有する細長い多数の偏平チューブ（３）と、前記平面部（１）が互いに平行に整列された各偏平チューブ間に、それぞれ介装されるコルゲートフィン（４）と、を具備し、
扁平チューブ（３）の開口端を結ぶ方向が軸方向（Ｓ）であり、前記平面部（１）において前記軸方向（Ｓ）と直交する方向が幅方向であり、
各コルゲートフィン（４）は、波形に曲折され、その折返しの各頂部（４ａ）は、偏平チューブ（３）の平面部（１）の表面の前記幅方向に直線上に延在しており、
各頂部（４ａ）と平面部（１）とは重ねられ、平面部（１）の表面の前記幅方向に直線上に延在するろう付接合部によりそれぞれ固定され、
偏平チューブ（３）の平面部（１）には、表面側から内面側に向かって膨出された多数のディンプル（６）が前記軸方向（Ｓ）及び前記幅方向に互いに離間して千鳥状に配置された各熱交換器コア（５）において、
各ディンプル（６）が存在する位置では、平面部（１）において前記幅方向にはそれが一つのみ存在し、他のディンプル（６）が存在しないようにし、前記各ろう付接合部には二つ以上のディンプル（６）が存在していないことを特徴とする熱交換器コア。 A large number of elongated flat tubes (3) having a pair of opposing rectangular plane parts (1) and a pair of end face parts (2) connecting the ends of both plane parts (1), and the plane part (1). corrugated fins (4) interposed between the flat tubes arranged parallel to each other,
The direction connecting the open ends of the flat tube (3) is the axial direction (S), and the direction perpendicular to the axial direction (S) in the flat part (1) is the width direction,
Each corrugated fin (4) is bent into a wave shape, and each folded top (4a ) extends linearly in the width direction of the surface of the flat part (1) of the flat tube (3),
Each top portion (4a) and the plane portion (1) are overlapped and fixed by brazing joints extending linearly in the width direction on the surface of the plane portion (1) ,
In the flat part (1) of the flat tube (3), a large number of dimples (6) bulging from the front side toward the inner side are spaced apart from each other in the axial direction (S) and the width direction, and are arranged in a staggered pattern. In each heat exchanger core (5) arranged in
At the position where each dimple (6) exists, only one dimple (6) exists in the width direction in the plane part (1), and no other dimple (6) exists, and each of the brazed joints A heat exchanger core characterized in that two or more dimples (6) are not present.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000075593A1 (en) 1999-06-05 2000-12-14 Visteon Technologies, Llc Heat exchanger tube

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07190661A (en) * 1993-12-27 1995-07-28 Hitachi Ltd Heat exchanger
JPH07318291A (en) * 1994-05-26 1995-12-08 Toyo Radiator Co Ltd Heat exchanger

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000075593A1 (en) 1999-06-05 2000-12-14 Visteon Technologies, Llc Heat exchanger tube

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