JP6559517B2 - Manufacturing method of flat tube for heat exchanger and flat tube by the method - Google Patents

Manufacturing method of flat tube for heat exchanger and flat tube by the method Download PDF

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JP6559517B2
JP6559517B2 JP2015182697A JP2015182697A JP6559517B2 JP 6559517 B2 JP6559517 B2 JP 6559517B2 JP 2015182697 A JP2015182697 A JP 2015182697A JP 2015182697 A JP2015182697 A JP 2015182697A JP 6559517 B2 JP6559517 B2 JP 6559517B2
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植木浩貴
竹内賢二
伊神多加司
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T.RAD CO., L T D.
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Description

本発明は、表面にろう材が被覆又は配置される条材を曲折して、一対のプレートを形成するとともに、その幅方向の中間部に仕切部を一体に形成した熱交換器の偏平チューブの製造方法およびその方法にかかる偏平チューブに関する。   The present invention provides a flat tube for a heat exchanger in which a strip material on which a brazing material is coated or disposed is bent to form a pair of plates, and a partition portion is integrally formed at an intermediate portion in the width direction. The present invention relates to a manufacturing method and a flat tube according to the method.

下記特許文献１に記載の偏平チューブの製造方法は、プレートの幅方向の一端部及び他端部に巻き締め部を形成し、その中間部に仕切部を突設形成した一対の同一形状のプレートをその両端縁で巻き締めたものである。
そして、仕切の頂部に定間隔にろう材浸透用の欠切部を形成し、一対のプレートを重ね合わせた後にそれを炉内に搬入し、プレートの外面側のろう材を仕切部のスリットを介して浸透させ、仕切部とそれに対向する平坦面との間を一体的にろう付け固定するものである。
次に、特許文献２に記載の発明は、一対の皿状のプレートの平坦面に複数の仕切部をその幅方向に互いに離間して配置し、各プレートの両縁部どうしを巻き締めたものである。 The manufacturing method of the flat tube described in the following Patent Document 1 is a pair of identically shaped plates in which a tightening portion is formed at one end and the other end in the width direction of the plate, and a partitioning portion is formed projecting at an intermediate portion thereof. Is tightened at both end edges.
Then, a notch portion for brazing filler metal penetration is formed at regular intervals on the top of the partition, and after overlapping the pair of plates, it is carried into the furnace, and the brazing material on the outer surface side of the plate is inserted into the slit of the partition portion. The partition portion and the flat surface facing the partition portion are integrally brazed and fixed.
Next, in the invention described in Patent Document 2, a plurality of partitioning portions are arranged apart from each other in the width direction on a flat surface of a pair of dish-shaped plates, and both edges of each plate are wound together. It is.

特開２０１５−７８８２１号公報Japanese Patent Laying-Open No. 2015-78821 特開２００９−１７４８４３号公報JP 2009-174843 A

本発明者の実験によれば、従来の偏平チューブの製造方法においては、一対のプレートの両端縁どうしを巻き締めた後に、炉内で一体にろう付した時、その仕切部とそれに接触する平坦面とのろう付の信頼性にかける欠点があった。
そこで、本発明は一対の同形状のプレートどうしを炉内でろう付する際に、一対のプレートどうしを確実にろう付できる、信頼性の高い製造方法を提供することを課題とする。 According to the inventor's experiments, in the conventional method of manufacturing a flat tube, when both ends of a pair of plates are wound together and then brazed together in a furnace, the partition portion and a flat surface in contact with the partition portion are fixed. There was a drawback to the reliability of brazing with the surface.
Then, this invention makes it a subject to provide the manufacturing method with high reliability which can braze a pair of plate reliably when brazing a pair of plate of the same shape in a furnace.

請求項１に記載の発明は、それぞれ外面側と内面の少なくとも一方にろう材(1)が被覆または配置される金属板により一対のプレート(2)(2)を成形し、
前記一対のプレート(2)(2)の平坦面(3)の幅方向の中間に、一以上の仕切部(4)をその両プレート(2)(2)の長手方向へ一直線上に延在し、
両プレート(2)(2)の幅方向の両端縁どうしを互いに閉め巻き締めてなる熱交換器用偏平チューブの製造方法において、
一方のプレート(2)の前記仕切部(4)を他方のプレート(2)の前記平坦面(3)に当接し、両プレート(2)の両縁部を巻締める工程と、
前記一直線上の位置で、部分的に一方のプレート(2)と他方のプレート(2)との間を仮溶接する工程と、
次いで一対のプレート(2)(2)を炉内で一体にろう付する工程と、
を具備する熱交換器用偏平チューブの製造方法である。 According to the first aspect of the present invention, a pair of plates (2) and (2) are formed by a metal plate in which a brazing material (1) is coated or arranged on at least one of the outer surface side and the inner surface, respectively.
In the middle of the width direction of the flat surface (3) of the pair of plates (2) (2), one or more partitions (4) extend in a straight line in the longitudinal direction of the plates (2) (2). And
In the method for producing a flat tube for a heat exchanger in which both edges in the width direction of both plates (2) and (2) are closed and wound together,
A step of abutting the partition portion (4) of one plate (2) with the flat surface (3) of the other plate (2) and winding both edges of both plates (2);
A step of temporarily welding between one plate (2) and the other plate (2) at a position on the straight line;
Next, a step of brazing the pair of plates (2) and (2) together in a furnace,
It is a manufacturing method of the flat tube for heat exchangers which comprises this.

請求項２に記載の発明は、請求項１に記載の熱交換器用偏平チューブの製造方法において、
前記他方のプレート(2)の当接位置の一直線上に、プレート(2)の厚み方向に貫通するろう材浸透用のスリット(5)を所定間隔ごとに形成しておくと共に、前記仕切部(4)上にフラックス(10)を予め塗布しておく工程を有する熱交換器用偏平チューブの製造方法である。 Invention of Claim 2 is a manufacturing method of the flat tube for heat exchangers of Claim 1,
On the straight line of the contact position of the other plate (2), slits (5) for brazing filler metal penetrating in the thickness direction of the plate (2) are formed at predetermined intervals, and the partition portion ( 4) A method for producing a flat tube for a heat exchanger, which includes a step of previously applying a flux (10) onto the tube.

請求項３に記載の発明は、請求項２に記載の熱交換器用偏平チューブの製造方法において、
前記スリット(5)の外面側の縁に、横断面が前記仕切部(4)側へ向け凹陥したろう材侵入用の微小な案内溝(5a)を形成しておく工程を有する熱交換器用偏平チューブの製造方法である。 Invention of Claim 3 in the manufacturing method of the flat tube for heat exchangers of Claim 2,
The heat exchanger flat having a step of forming, on the outer surface side edge of the slit (5), a minute guide groove (5a) for intrusion of the brazing material having a cross section recessed toward the partition (4) side. It is a manufacturing method of a tube.

請求項４に記載の発明は、請求項３に記載の熱交換器用偏平チューブの製造方法において、
前記スリット(5)は、各プレート(2)の平坦面(3)に外面側から内面側に貫通して、隙間付きスリット(5c)を形成する工程と、
前記隙間付きスリット(5c)のプレート(2)の内面側を平坦に成形して、貫通部(5b)を形成するとともに、その外面側に前記微小な案内溝(5a)を形成する工程と、
を具備する熱交換器用偏平チューブの製造方法である。 Invention of Claim 4 in the manufacturing method of the flat tube for heat exchangers of Claim 3,
The slit (5) passes through the flat surface (3) of each plate (2) from the outer surface side to the inner surface side to form a slit with a gap (5c),
Forming the inner surface side of the plate (2) of the slit (5c) with a gap flat to form a through-hole (5b) and forming the minute guide groove (5a) on the outer surface side;
It is a manufacturing method of the flat tube for heat exchangers which comprises this.

請求項５に記載の発明は、請求項３または請求項４のいずれかに記載の熱交換器用偏平チューブの製造方法において、
前記仕切部(4)は、平坦面の幅方向の中間を山形に折り曲げ、次いでその山形の両斜面どうしを重ね合わせて密着させる工程と、
その頂部(4a)を平坦面(3)側に平行に押し潰す工程と、
を具備する熱交換器用偏平チューブの製造方法である。 Invention of Claim 5 in the manufacturing method of the flat tube for heat exchangers in any one of Claim 3 or Claim 4,
The partition portion (4) is a step of bending the middle of the flat surface in the width direction into a chevron, and then overlapping and sticking both slopes of the chevron,
Crushing the top (4a) parallel to the flat surface (3) side,
It is a manufacturing method of the flat tube for heat exchangers which comprises this.

請求項６に記載の発明は、請求項１〜請求項５に記載のいずれかの熱交換器用偏平チューブの製造方法において、
各プレート(2)(2)は、その一端側に、端部外周が円弧状で、チューブ軸線に垂直な横断面がＵ字状の第１巻締め部(6)を形成し、
プレート(2)(2)の他端側に、前記第１巻締め部(6)の内周に整合する外周を有し、曲率半径が第１巻締め部(6)のそれよりプレート(2)の板厚分小径で内側に板厚分の段付き(8)を介して、第２巻締め部(9)を形成し、
一方のプレート(2)の第１巻締め部(6)と、他方のプレート(2)の第２巻締め部(9)とが、互いに抱持されるように、各プレート(2)の幅方向の両縁を逆向きに配置し、
各プレート(2)の両端どうしを互いに巻締めて、偏平チューブを形成したことを特徴とする熱交換器用偏平チューブの製造方法である。 Invention of Claim 6 in the manufacturing method of the flat tube for heat exchangers in any one of Claims 1-5,
Each plate (2) (2) has, on one end thereof, a first tightening portion (6) having an arcuate outer periphery and a U-shaped cross section perpendicular to the tube axis,
The other end of the plates (2) and (2) has an outer periphery that matches the inner periphery of the first winding portion (6), and the radius of curvature is larger than that of the first winding portion (6). ) To form the second tightening portion (9) through the step (8) with a small thickness on the inside and a thickness on the inside,
The width of each plate (2) so that the first tightening portion (6) of one plate (2) and the second tightening portion (9) of the other plate (2) are held together. Place the opposite edges of the direction,
A flat tube for a heat exchanger is characterized in that a flat tube is formed by winding both ends of each plate (2) together.

請求項７に記載の発明は、請求項６に記載の熱交換器用偏平チューブの製造方法において、
前記第２巻締め部(9)の前記段付き(8)に、整合するように第１巻締め部(6)の先端縁を横断面鋭角の鋭角縁(12)を形成した熱交換器用偏平チューブの製造方法である。 Invention of Claim 7 is a manufacturing method of the flat tube for heat exchangers of Claim 6,
A flat shape for a heat exchanger in which a sharp edge (12) having a sharp cross section is formed at the tip edge of the first winding tightening part (6) so as to align with the step (8) of the second winding tightening part (9). It is a manufacturing method of a tube.

請求項８に記載の発明は、請求項１〜請求項７のいずれかに記載の熱交換器用偏平チューブの製造方法により製造された熱交換器用偏平チューブにおいて、
前記一対のプレート(2)(2)が同一形状に形成されたものであることを特徴とする熱交換器用偏平チューブである。 Invention of Claim 8 is the flat tube for heat exchangers manufactured by the manufacturing method of the flat tube for heat exchangers in any one of Claims 1-7,
A flat tube for a heat exchanger, wherein the pair of plates (2) and (2) are formed in the same shape.

本発明の熱交換器の偏平チューブの製造方法は、一方のプレート２の前記仕切部３の当接位置で、部分的に一方のプレート２と他方のプレート２との間を仮溶接し、次いで一対のプレート２、２を炉内で一体にろう付するものである。
その仮溶接により、一対のプレート２、２を仕切部４の位置で確実に接触させた状態で、一対のプレート間をろう付できるので、一方のプレート２の仕切部４と、他方のプレート２の平坦面３との間のろう付を確実に実効することができ、信頼性の高い偏平チューブを提供できる。 The method for producing a flat tube for a heat exchanger according to the present invention is such that a part of one plate 2 is temporarily welded between one plate 2 and the other plate 2 at a contact position of the partition portion 3 of one plate 2, and then A pair of plates 2 and 2 are brazed together in a furnace.
The temporary welding allows the pair of plates 2 and 2 to be brazed between the pair of plates 2 and 2 in a state where the plates 2 and 2 are securely in contact with each other. Therefore, it is possible to reliably perform brazing between the flat surface 3 and the flat tube with high reliability.

上記構成において、請求項２に記載の発明のように、他方のプレート２の当接位置の一直線上に、プレート２の厚み方向に貫通するろう材浸透用のスリット５を所定間隔ごとに形成しておくと共に、仕切部４上にフラックスを予め塗布しておく場合には、
当接した仕切部４と平坦面３との間を、ろう材１がスリット５を介して浸透するので、確実なろう付を行うことができる。 In the above configuration, as in the invention described in claim 2, the brazing material penetration slits 5 penetrating in the thickness direction of the plate 2 are formed at predetermined intervals on a straight line of the contact position of the other plate 2. In addition, when applying the flux on the partition 4 in advance,
Since the brazing material 1 permeates through the slit 5 between the abutting partitioning portion 4 and the flat surface 3, reliable brazing can be performed.

上記構成において、請求項３に記載の発明のように、前記スリット５の外面側の縁に、前記仕切部４側へ向け凹陥したろう材侵入用の微小な案内溝５ａを形成しておく場合には、
外面のろう材１を、案内溝５ａを介してスリット５内に浸透させて、仕切部４の頂部４ａと平坦面３との間のろう付の信頼性を確保できる。 In the above configuration, as in the invention described in claim 3, a minute guide groove 5 a for intrusion of the brazing material that is recessed toward the partition portion 4 side is formed on the outer surface side edge of the slit 5. In
The brazing material 1 on the outer surface penetrates into the slit 5 through the guide groove 5a, and the reliability of brazing between the top portion 4a of the partition portion 4 and the flat surface 3 can be ensured.

上記構成において、請求項４に記載の発明のように、一方のプレート２のスリット５を、各プレート２の平坦面３にプレート２の外面側から内面側に貫通させ、次いでその隙間付きスリット５ｃの内面側を平坦に成形して、貫通部５ｂを形成し、その外面側に微小な案内溝５ａを形成する場合には、案内溝５ａの形成を容易且つ確実にできる。   In the above configuration, as in the invention described in claim 4, the slit 5 of one plate 2 is made to penetrate the flat surface 3 of each plate 2 from the outer surface side to the inner surface side of the plate 2, and then the slit 5c with a gap is provided. In the case where the inner surface side is formed flat to form the penetrating portion 5b and the minute guide groove 5a is formed on the outer surface side, the guide groove 5a can be formed easily and reliably.

上記構成において、請求項５に記載の発明のように、前記仕切部４の成形を、先ず山形に折り曲げ、その斜面どうしを重ね合わせて密着させ、その頂部４ａを平坦面３に平行に押し潰した場合には、仕切部４の頂部４ａを確実に平坦にして、その先端面を対向するプレート２の内面に密着させて、ろう付を行うことができる。それによりろう付の信頼性を向上できる。   In the above-described configuration, as in the invention described in claim 5, the partition portion 4 is first formed into a mountain shape, and the slopes are overlapped and brought into close contact with each other, and the top portion 4a is crushed parallel to the flat surface 3. In this case, it is possible to perform brazing by ensuring that the top portion 4a of the partition portion 4 is flat and the front end surface thereof is in close contact with the inner surface of the opposing plate 2. Thereby, the reliability of brazing can be improved.

上記構成において、請求項６に記載の発明のように、各プレート２、２の一端に第１巻締め部６を形成し、他端側に、曲率半径がプレート２の板厚分小径の第２巻締め部９を段付き８を介して形成し、同一形状の各プレート２、２どうしを互いに逆向きにして巻締めた場合には、製造が容易な偏平チューブを量産できる。   In the above configuration, as in the invention described in claim 6, the first tightening portion 6 is formed at one end of each of the plates 2 and 2, and the radius of curvature is smaller than the thickness of the plate 2 at the other end. When the two-winding tightening portion 9 is formed through the stepped portion 8 and the plates 2 and 2 having the same shape are wound in opposite directions, flat tubes that are easy to manufacture can be mass-produced.

上記構成において、請求項７に記載の発明のように、第２巻締め部９の段付き８に、整合するように第１巻締め部６の先端縁を横断面鋭角の鋭角縁１２を形成した場合には、一対のプレート２、２どうしを互いに巻締めると、一方のプレート２の先端縁１２が他方のプレート２の段付き８に接続され、外周の継目が塞がれた偏平チューブとなり、それが挿通されるチューブプレートの孔との間や、隣接するフィンとの間に隙間のないろう付が可能となる。   In the above-described configuration, as in the invention described in claim 7, the sharp edge 12 having an acute cross section is formed at the tip edge of the first tightening portion 6 so as to align with the step 8 of the second tightening portion 9. In this case, when the pair of plates 2 and 2 are wound together, the tip edge 12 of one plate 2 is connected to the stepped portion 8 of the other plate 2, and the outer peripheral seam is closed. It is possible to braze without a gap between the hole of the tube plate through which it is inserted or between adjacent fins.

上記いずれかに記載の方法により製造された偏平チューブのように、一対のプレート２、２を同一形状に形成したものとした場合、チューブの製造を容易に行うことができ、ろう付性のよい熱交換器を構成できる。   When the pair of plates 2 and 2 are formed in the same shape as the flat tube manufactured by any one of the methods described above, the tube can be easily manufactured and has good brazing properties. A heat exchanger can be constructed.

本発明の偏平チューブの分解斜視図およびその組立て状態を示す斜視図。The perspective view which shows the exploded perspective view of the flat tube of this invention, and its assembly state. 同偏平チューブの平面図及び背面図、並びに縦断面図、横断面図及びその拡大図。The top view and rear view of the flat tube, and a longitudinal sectional view, a transverse sectional view and an enlarged view thereof. 同実施例の仮溶接部13であって図１（Ｂ）III−III断面拡大図、そのろう付後の拡大図。It is the temporary welding part 13 of the Example, FIG.1 (B) III-III cross-sectional enlarged view, The enlarged view after the brazing. 図１（Ｂ）IV−IV断面拡大図、同ろう付後の拡大図。FIG. 1 (B) IV-IV cross-sectional enlarged view, enlarged view after brazing. 同偏平チューブに用いるプレート２の成形を順に示す第一工程の説明図。Explanatory drawing of the 1st process which shows shaping | molding of the plate 2 used for the flat tube in order. 同第２工程を順に示す説明図。Explanatory drawing which shows the 2nd process in order. 同第３工程を順に示す説明図。Explanatory drawing which shows the 3rd process in order. 同第４工程を順に示す説明図。Explanatory drawing which shows the 4th process in order. 一対のプレートどうしを巻き締めた状態を示す横断面図。The cross-sectional view which shows the state which wound up a pair of plates.

次に、図面に基づいて、本発明の実施の形態を説明する。
図１（Ａ）は、その偏平チューブのろう付前の分解斜視図であり、同図（Ｂ）は、同組立て状態の斜視図である。
同図に示す如く、この偏平チューブは一対の同一形状のプレート２を成形し、次いで、その一対のプレート２の仕切部４の頂部４ａにフラックス１０を配置した状態で、一対のプレート２を互いに逆向きに重ね合わせ、その幅方向の両端縁を巻き締めて、偏平チューブ１５を形成するものである。 Next, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 (A) is an exploded perspective view of the flat tube before brazing, and Fig. 1 (B) is a perspective view of the assembled state.
As shown in the figure, this flat tube forms a pair of identically shaped plates 2 and then places the pair of plates 2 together with the flux 10 placed on the top 4a of the partition 4 of the pair of plates 2. The flat tubes 15 are formed by overlapping in the opposite direction and winding the both edges in the width direction.

この同一形状のプレート２は、図５〜図８の各工程により、成形される。
本発明を説明するに当たり、プレート２に形成される仕切部４が一直線上に延在する方向を長手方向とする。つまり、図１（Ｂ）に示す如く、プレート２どうしを仮組みした際のチューブ軸線の方向である。
先ず、図５（Ａ）に示す如く、プレート２を形成するアルミニウム製の金属板１６を用意する。好ましくは、図３及び図４に示す如く、その金属板１６としてクラッド材（芯材としてＡ３００３材、ろう材１（芯材外面側）としてＸ４３４３、犠牲陽極材１４（芯材内面側）としてＡ７０７２材）を用いる。芯材、ろう材１、犠牲陽極材１４の材質は、任意である。なお、プレート２をステンレス板で構成する場合には、バインダを介して、粉末のろう材をプレートの外面側に被着させる。
次いで、同図（Ｂ）の如く、その金属板１６の幅方向の中間部を、この例では３か所、互いに離間して山形に折り曲げる。さらに、同図（Ｃ）、（Ｅ）の如く、その山形の両斜面を互いに突き合わせて仕切部４を成形する。次いで、同図（Ｄ）、（Ｆ）の如く、その仕切部４の頂部４ａを平坦面３に平行になるように押し潰す。この仕切部４は、プレート２の長手方向に一直線上に延在する。 The plate 2 having the same shape is formed by the steps shown in FIGS.
In describing the present invention, the direction in which the partition 4 formed on the plate 2 extends in a straight line is defined as the longitudinal direction. That is, as shown in FIG. 1B, the direction of the tube axis when the plates 2 are temporarily assembled together.
First, as shown in FIG. 5A, an aluminum metal plate 16 for forming the plate 2 is prepared. Preferably, as shown in FIGS. 3 and 4, the metal plate 16 is a clad material (A3003 material as a core material, X4343 as a brazing material 1 (core material outer surface side), and A7072 as a sacrificial anode material 14 (core material inner surface side). Material). The material of the core material, the brazing material 1 and the sacrificial anode material 14 is arbitrary. When the plate 2 is formed of a stainless steel plate, a powder brazing material is attached to the outer surface side of the plate via a binder.
Next, as shown in FIG. 3B, the intermediate portion in the width direction of the metal plate 16 is bent into a chevron at three places in this example, separated from each other. Further, as shown in FIGS. 2C and 2E, the two slopes of the chevron are brought into contact with each other to form the partition portion 4. Next, as shown in FIGS. 2D and 2F, the top 4a of the partition 4 is crushed so as to be parallel to the flat surface 3. FIG. The partition 4 extends in a straight line in the longitudinal direction of the plate 2.

次に、図６に示す如く、一対の仕切部４間の幅方向の中間に、断続的に外面側から内面側にプレート２の厚み方向に貫通することにより、僅かな隙間を有する隙間付きスリット５ｃを金属板１６の長手方向に間欠的に形成する。この時、隙間付きスリット５ｃの縁部は、内面側に反返っている。
次いで、図７の（Ａ）、（Ｂ）に示す如く、金属板１６の内面側を基準として、反返った隙間付きスリット５ｃの縁部を押し込み、閉塞することによって、それぞれ幅の狭小なスリット５が形成される。スリット５の内面側は、平坦な貫通孔５ｂが形成される。
そして、その外面側には、前記貫通後の閉塞工程の際、その貫通孔５ｂの縁にプレート２の長手方向に垂直な横断面が僅かに凹陥する案内溝５ａが形成される。即ち、図６において、外面側から内面側に隙間付きスリット５ｃを形成することにより生じたそのスリット５ｃの縁部が、図７（Ｂ）において、外側に僅かな断面Ｖ字状部を形成することにより、案内溝５ａは成形される。 Next, as shown in FIG. 6, a slit with a gap having a slight gap by intermittently penetrating from the outer surface side to the inner surface side in the thickness direction of the plate 2 in the middle in the width direction between the pair of partition portions 4. 5 c is intermittently formed in the longitudinal direction of the metal plate 16. At this time, the edge part of the slit 5c with a gap has turned to the inner surface side.
Next, as shown in FIGS. 7A and 7B, the edge of the slit 5c with a gap that has been turned back is pressed and closed with the inner surface side of the metal plate 16 as a reference, so that each slit has a narrow width. 5 is formed. A flat through hole 5 b is formed on the inner surface side of the slit 5.
Further, on the outer surface side, a guide groove 5a in which a transverse section perpendicular to the longitudinal direction of the plate 2 is slightly recessed is formed at the edge of the through hole 5b in the closing step after the penetration. That is, in FIG. 6, the edge of the slit 5c generated by forming the slit 5c with a gap from the outer surface side to the inner surface side forms a slight V-shaped section on the outer side in FIG. 7B. Thus, the guide groove 5a is formed.

次いで、金属板１６の図７（Ａ）における右端には、鋭角縁１２が形成される。この鋭角縁１２は、一例として次のようにして形成できる。図７（Ｃ）に示す如く、金属板１６の縁部を軸線が直線な第１ローラ１７と、縁部が斜めに形成された第２ローラ１８との間に供給し、塑性変形により、金属板１６の右端に鋭角縁１２を形成するものである。
この鋭角縁１２は、図７（Ｄ）に示す如く、金属板１６の左端の第２巻締め部９の根元部に設けられた段付き８に整合する。そして、図７（Ｄ）に示す如く、プレート２の左端及び右端は、金属板１６の平坦面３に対して一旦、直角に折り曲げられた後に、図９に示す偏平チューブが形成されるように、その偏平チューブの軸線に垂直な横断面がＵ字状になるよう曲折される。 Next, an acute angle edge 12 is formed at the right end of the metal plate 16 in FIG. The acute angle edge 12 can be formed as follows as an example. As shown in FIG. 7 (C), the edge of the metal plate 16 is supplied between a first roller 17 having a straight axis and a second roller 18 having an edge formed obliquely. An acute edge 12 is formed at the right end of the plate 16.
As shown in FIG. 7D, the acute angle edge 12 is aligned with a stepped portion 8 provided at the base portion of the second tightening portion 9 at the left end of the metal plate 16. 7D, the left end and the right end of the plate 2 are once bent at a right angle with respect to the flat surface 3 of the metal plate 16 so that the flat tube shown in FIG. 9 is formed. The cross section perpendicular to the axis of the flat tube is bent in a U shape.

図８において、右側の第１巻締め部６の端部外周は円弧状に形成され、左側の第２巻締め部９の外周は右側の第１巻締め部６の内周に整合する。それとともに、第２巻締め部９の曲率半径は、第１巻締め部６の曲率半径に対して、金属板１６の板厚分だけ小であるとともに、その付根に斜めの段付き８が形成される。この段付き８は金属板１６の板厚分だけ平坦面３側に斜めに形成される。
なお、同図（Ｂ）、図２（Ｄ）、図３（Ａ）、図４（Ａ）に示す如く、各仕切部４の頂部４ａの上面にはフラックス１０が付着される。 In FIG. 8, the outer periphery of the end of the right first tightening portion 6 is formed in an arc shape, and the outer periphery of the left second winding tightening portion 9 is aligned with the inner periphery of the right first tightening portion 6. At the same time, the radius of curvature of the second winding portion 9 is smaller than the curvature radius of the first winding portion 6 by the thickness of the metal plate 16, and an oblique step 8 is formed at the root. Is done. The step 8 is formed obliquely on the flat surface 3 side by the thickness of the metal plate 16.
In addition, as shown in FIG. 2B, FIG. 2D, FIG. 3A, and FIG. 4A, the flux 10 is attached to the top surface of the top 4a of each partition 4.

これらのプレート２は、予め、その長手方向の所定長さごとに切断されている。そして、一対の同一形状のプレート２を互いに逆向きに重ね合わせ、図９の如く、組立てる。なお、同図において、第２巻締め部９は一旦、第１巻締め部６の内側に収納された後に、第１巻締め部６がその外周に折り曲げられるものである。   These plates 2 are cut in advance for each predetermined length in the longitudinal direction. Then, a pair of plates 2 having the same shape are stacked in opposite directions and assembled as shown in FIG. In addition, in the figure, after the 2nd winding fastening part 9 is once accommodated inside the 1st winding fastening part 6, the 1st winding fastening part 6 is bent by the outer periphery.

図１〜図２に示す如く、各プレート２の表面には、仕切部４とスリット５との間にディンプル１１が突設形成される（図５〜図８では省略する）。ただし、ディンプル１１の有無は任意のものであり、必ず必要となるものではない。
図４（Ａ）は、スリット５の形成位置を示す図１（Ｂ）のIV-IV矢視断面図である。一方のプレート２のスリット５の位置は、相対する他方のプレート２の仕切部４の平坦な頂部４ａのセンター位置に来るよう、プレート成型工程で調整される。 As shown in FIGS. 1 to 2, dimples 11 are formed on the surface of each plate 2 so as to project between the partition portion 4 and the slit 5 (not shown in FIGS. 5 to 8). However, the presence or absence of the dimple 11 is arbitrary, and is not necessarily required.
4A is a cross-sectional view taken along the line IV-IV in FIG. The position of the slit 5 of one plate 2 is adjusted in the plate molding process so as to come to the center position of the flat top portion 4a of the partitioning portion 4 of the other plate 2 facing each other.

図３（Ａ）は、図１（Ｂ）のIII-III矢視断面図であり、仮溶接１３の位置での仕切部４と平坦面３との接続状態を示している。図１（Ｂ）、図３（Ａ）に示す如く、一対のプレート２の両端部を互いに嵌着して巻き締めた後に、仕切部４及びスリット５が重なり合った仮想ライン上で適宜位置に、好ましくはレーザ溶接により仮溶接１３され、偏平チューブの仮固定が行われる。この仮溶接１３の溶け込み深さは、仕切部４の芯材位置まで達することが好ましい。
この仮固定の構造により、一対の対向するプレート２間が浮き上がらないように保持され、チューブプレートへの偏平チューブの挿通時のプレートずれ、端部の潰れ、巻き締め部のずれにおけるろう漏れ等を防止することができ、結果として、その偏平チューブを用いた熱交換器の信頼性が向上する。 FIG. 3A is a cross-sectional view taken along the line III-III in FIG. 1B and shows a connection state between the partition portion 4 and the flat surface 3 at the position of the temporary weld 13. As shown in FIG. 1 (B) and FIG. 3 (A), after both ends of the pair of plates 2 are fitted and tightened to each other, the partition 4 and the slit 5 are placed at appropriate positions on the overlapping virtual line. Preferably, temporary welding 13 is performed by laser welding, and the flat tube is temporarily fixed. It is preferable that the penetration depth of the temporary weld 13 reaches the core material position of the partition portion 4.
With this temporary fixing structure, the pair of opposing plates 2 are held so as not to be lifted, and plate displacement, flattening of the end portion, and brazing leakage due to displacement of the tightening portion, etc. are caused when the flat tube is inserted into the tube plate. As a result, the reliability of the heat exchanger using the flat tube is improved.

次いで、組立てられた偏平チューブ１５の両端部は図示しないチューブプレートの偏平孔に挿通されるとともに、各偏平チューブ１５間に図示しないコルゲートフィン（又はプレートフィン）が配置されて、熱交換器のコアを形成し、そのコア全体を治具で固定した状態で、高温の炉内に搬入される。
そして、各プレート２の表面に被覆されたろう材１が溶融し、その溶融ろう材がスリット５の案内溝５ａから貫通部５ｂを通り偏平チューブ１５の内部に浸透し、図３（Ｂ）、図４（Ｂ）に示す如く、フラックス１０を介して仕切部４とそれに対向する平坦面３との間がろう付けされる。図４（Ｂ）は、スリット５の位置で、ろう付後の仕切部４と平坦面３との状態を示す。 Next, both ends of the assembled flat tube 15 are inserted into flat holes in a tube plate (not shown), and corrugated fins (or plate fins) (not shown) are arranged between the flat tubes 15 to form the core of the heat exchanger. And the entire core is fixed in a jig and is carried into a high-temperature furnace.
Then, the brazing filler metal 1 coated on the surface of each plate 2 is melted, and the molten brazing filler metal penetrates the inside of the flat tube 15 from the guide groove 5a of the slit 5 through the penetrating portion 5b, and FIG. As shown in FIG. 4 (B), the partition 4 and the flat surface 3 opposed thereto are brazed via the flux 10. FIG. 4B shows the state of the partition portion 4 and the flat surface 3 after brazing at the position of the slit 5.

なお、第２巻締め部９と第１巻締め部６とは、図２（Ｄ）に示す如く、互いに密着して巻き締められるとともに、第１巻締め部６の鋭角縁１２と第２巻締め部９の斜めの段付き８とが密着し、そこに隙間がないように形成される。   As shown in FIG. 2 (D), the second winding tightening portion 9 and the first winding tightening portion 6 are tightly wound together and the acute angle edge 12 of the first winding tightening portion 6 and the second winding. It forms so that the diagonal step 8 of the fastening part 9 closely_contact | adheres and there is no clearance gap there.

上記実施例において、仕切部４の頂部４ａにフラックスを塗布するものとして説明したが、これに限定されるものではなく、偏平チューブの外面側で、スリット上にフラックスを塗布し、ろう材とともに、ろう材浸透用のスリット５を介して偏平チューブの内部に供給してもよい。
また、スリット５の形状は、図１等に図示された細長いものに限定されず、ミシン目（連続した***）状のものであってもよい。 In the above embodiment, the flux is applied to the top portion 4a of the partition portion 4, but the present invention is not limited to this, and the flux is applied on the slit on the outer surface side of the flat tube, together with the brazing material, You may supply to the inside of a flat tube through the slit 5 for brazing material penetration | invasion.
In addition, the shape of the slit 5 is not limited to the elongated shape illustrated in FIG. 1 and the like, and may be a perforated (continuous small hole) shape.

本発明の偏平チューブは、エンジン冷却水冷却用ラジエータや、空調用熱交換器、ＥＧＲクーラその他の熱交換器に利用できる。   The flat tube of the present invention can be used for an engine cooling water cooling radiator, an air conditioning heat exchanger, an EGR cooler, and other heat exchangers.

１ ろう材
２ プレート
３ 平坦面
４ 仕切部
４ａ 頂部
５ スリット
５ａ 案内溝
５ｂ 貫通部
５ｃ 隙間付きスリット
６ 第１巻締め部
８ 段付き
９ 第２巻締め部 DESCRIPTION OF SYMBOLS 1 Brazing material 2 Plate 3 Flat surface 4 Partition part 4a Top part 5 Slit 5a Guide groove 5b Through part 5c Slit with a gap 6 1st winding part 8 Step 9 9 Second winding part

１０ フラックス
１１ ディンプル
１２ 鋭角縁
１３ 仮溶接
１４ 犠牲陽極材
１５ 偏平チューブ
１６ 金属板
１７ 第１ローラ
１８ 第２ローラ DESCRIPTION OF SYMBOLS 10 Flux 11 Dimple 12 Sharp edge 13 Temporary welding 14 Sacrificial anode material 15 Flat tube 16 Metal plate 17 1st roller 18 2nd roller

Claims (8)

それぞれ外面側と内面の少なくとも一方にろう材(1)が被覆または配置される金属板により一対のプレート(2)(2)を成形し、
前記一対のプレート(2)(2)の平坦面(3)の幅方向の中間に、一以上の仕切部(4)をその両プレート(2)(2)の長手方向へ一直線上に延在し、
両プレート(2)(2)の幅方向の両端縁どうしを互いに閉め巻き締めてなる熱交換器用偏平チューブの製造方法において、
一方のプレート(2)の前記仕切部(4)を他方のプレート(2)の前記平坦面(3)に当接し、両プレート(2)の両縁部を巻締める工程と、
前記一直線上の位置で、部分的に一方のプレート(2)と他方のプレート(2)との間を仮溶接する工程と、
次いで一対のプレート(2)(2)を炉内で一体にろう付する工程と、
を具備する熱交換器用偏平チューブの製造方法。 A pair of plates (2) and (2) are formed from a metal plate on which at least one of the outer surface side and the inner surface is coated or disposed with a brazing material (1),
In the middle of the width direction of the flat surface (3) of the pair of plates (2) (2), one or more partitions (4) extend in a straight line in the longitudinal direction of the plates (2) (2). And
In the method for producing a flat tube for a heat exchanger in which both edges in the width direction of both plates (2) and (2) are closed and wound together,
A step of abutting the partition portion (4) of one plate (2) with the flat surface (3) of the other plate (2) and winding both edges of both plates (2);
A step of temporarily welding between one plate (2) and the other plate (2) at a position on the straight line;
Next, a step of brazing the pair of plates (2) and (2) together in a furnace,
The manufacturing method of the flat tube for heat exchangers which comprises this. 請求項１に記載の熱交換器用偏平チューブの製造方法において、
前記他方のプレート(2)の当接位置の一直線上に、プレート(2)の厚み方向に貫通するろう材浸透用のスリット(5)を所定間隔ごとに形成しておくと共に、前記仕切部(4)上にフラックス(10)を予め塗布しておく工程を有する熱交換器用偏平チューブの製造方法。 In the manufacturing method of the flat tube for heat exchangers of Claim 1,
On the straight line of the contact position of the other plate (2), slits (5) for brazing filler metal penetrating in the thickness direction of the plate (2) are formed at predetermined intervals, and the partition portion ( 4) A method for producing a flat tube for a heat exchanger, which comprises a step of previously applying a flux (10) onto the tube. 請求項２に記載の熱交換器用偏平チューブの製造方法において、
前記スリット(5)の外面側の縁に、横断面が前記仕切部(4)側へ向け凹陥したろう材侵入用の微小な案内溝(5a)を形成しておく工程を有する熱交換器用偏平チューブの製造方法。 In the manufacturing method of the flat tube for heat exchangers of Claim 2,
The heat exchanger flat having a step of forming, on the outer surface side edge of the slit (5), a minute guide groove (5a) for intrusion of the brazing material having a cross section recessed toward the partition (4) side. Tube manufacturing method. 請求項３に記載の熱交換器用偏平チューブの製造方法において、
前記スリット(5)は、各プレート(2)の平坦面(3)に外面側から内面側に貫通して、隙間付きスリット(5c)を形成する工程と、
前記隙間付きスリット(5c)のプレート(2)の内面側を平坦に成形して、貫通部(5b)を形成するとともに、その外面側に前記微小な案内溝(5a)を形成する工程と、
を具備する熱交換器用偏平チューブの製造方法。 In the manufacturing method of the flat tube for heat exchangers of Claim 3,
The slit (5) passes through the flat surface (3) of each plate (2) from the outer surface side to the inner surface side to form a slit with a gap (5c),
Forming the inner surface side of the plate (2) of the slit (5c) with a gap flat to form a through-hole (5b) and forming the minute guide groove (5a) on the outer surface side;
The manufacturing method of the flat tube for heat exchangers which comprises this. 請求項３または請求項４のいずれかに記載の熱交換器用偏平チューブの製造方法において、
前記仕切部(4)は、平坦面の幅方向の中間を山形に折り曲げ、次いでその山形の両斜面どうしを重ね合わせて密着させる工程と、
その頂部(4a)を平坦面(3)側に平行に押し潰す工程と、
を具備する熱交換器用偏平チューブの製造方法。 In the manufacturing method of the flat tube for heat exchangers in any one of Claim 3 or Claim 4,
The partition portion (4) is a step of bending the middle of the flat surface in the width direction into a chevron, and then overlapping and sticking both slopes of the chevron,
Crushing the top (4a) parallel to the flat surface (3) side,
The manufacturing method of the flat tube for heat exchangers which comprises this. 請求項１〜請求項５に記載のいずれかの熱交換器用偏平チューブの製造方法において、
各プレート(2)(2)は、その一端側に、端部外周が円弧状で、チューブ軸線に垂直な横断面がＵ字状の第１巻締め部(6)を形成し、
プレート(2)(2)の他端側に、前記第１巻締め部(6)の内周に整合する外周を有し、曲率半径が第１巻締め部(6)のそれよりプレート(2)の板厚分小径で内側に板厚分の段付き(8)を介して、第２巻締め部(9)を形成し、
一方のプレート(2)の第１巻締め部(6)と、他方のプレート(2)の第２巻締め部(9)とが、互いに抱持されるように、各プレート(2)の幅方向の両縁を逆向きに配置し、
各プレート(2)の両端どうしを互いに巻締めて、偏平チューブを形成したことを特徴とする熱交換器用偏平チューブの製造方法。 In the manufacturing method of the flat tube for heat exchangers in any one of Claims 1-5,
Each plate (2) (2) has, on one end thereof, a first tightening portion (6) having an arcuate outer periphery and a U-shaped cross section perpendicular to the tube axis,
The other end of the plates (2) and (2) has an outer periphery that matches the inner periphery of the first winding portion (6), and the radius of curvature is larger than that of the first winding portion (6). ) To form the second tightening portion (9) through the step (8) with a small thickness on the inside and a thickness on the inside,
The width of each plate (2) so that the first tightening portion (6) of one plate (2) and the second tightening portion (9) of the other plate (2) are held together. Place the opposite edges of the direction,
A method for producing a flat tube for a heat exchanger, characterized in that a flat tube is formed by winding both ends of each plate (2) together. 請求項６に記載の熱交換器用偏平チューブの製造方法において、
前記第２巻締め部(9)の前記段付き(8)に整合するように、第１巻締め部(6)の先端縁を横断面鋭角の鋭角縁(12)を形成した熱交換器用偏平チューブの製造方法。 In the manufacturing method of the flat tube for heat exchangers of Claim 6,
A flat shape for a heat exchanger in which the tip edge of the first winding tightening portion (6) is formed with an acute angle edge (12) having an acute cross section so as to align with the stepped portion (8) of the second winding tightening portion (9). Tube manufacturing method. 請求項１〜請求項７のいずれかに記載の熱交換器用偏平チューブの製造方法により製造された熱交換器用偏平チューブにおいて、
前記一対のプレート(2)(2)が同一形状に形成されたものであることを特徴とする熱交換器用偏平チューブ。 In the flat tube for heat exchangers manufactured by the manufacturing method of the flat tube for heat exchangers in any one of Claims 1-7,
A flat tube for a heat exchanger, wherein the pair of plates (2) and (2) are formed in the same shape.
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