JP5156817B2 - Piping consisting of multi-hole pipes and multiple branch pipes and their connection structure - Google Patents

Description

本発明は、多穴管の端部に複数の分岐管を接続する配管、その接続構造に関する。   The present invention relates to a pipe for connecting a plurality of branch pipes to an end of a multi-hole pipe, and a connection structure thereof.

この種の従来の多穴管と２本の分岐管からなる配管の接続構造としては、図１９及び図２０に示す特許文献１に開示されたものがある。図１９及び図２０に示すように、多穴管１００の端部に２つの分岐管１１０、１１０がロー付けで接続されることによって多穴管１００が分岐されている。   As this type of conventional multi-hole pipe and a pipe connection structure comprising two branch pipes, there is one disclosed in Patent Document 1 shown in FIGS. 19 and 20. As shown in FIGS. 19 and 20, the multi-hole pipe 100 is branched by connecting two branch pipes 110, 110 to the end of the multi-hole pipe 100 by brazing.

多穴管１００は、円筒状の外管部１０１、この外管部１０１の内部を２つの連通管１０２，１０２に仕切る仕切壁１０３とから構成されている。   The multi-hole tube 100 includes a cylindrical outer tube portion 101 and a partition wall 103 that partitions the inside of the outer tube portion 101 into two communication tubes 102 and 102.

２つの分岐管１１０、１１０は、端部１１０ａ、１１０ａが加工によってＤ形状にそれぞれ形成され、端部１１０ａ、１１０ａ以外が円筒状である。各分岐管１１０、１１０の端部１１０ａ、１１０ａの外周形状及び寸法は、多穴管１００の連通管１０２，１０２にほぼ一致するように設定されている。   In the two branch pipes 110 and 110, end portions 110a and 110a are formed in a D shape by processing, and the portions other than the end portions 110a and 110a are cylindrical. The outer peripheral shapes and dimensions of the end portions 110 a and 110 a of the branch pipes 110 and 110 are set so as to substantially match the communication pipes 102 and 102 of the multi-hole pipe 100.

そして、多穴管１００の端部の各連通管１０２，１０２に各分岐管１１０、１１０の端部１１０ａ、１１０ａがそれぞれ挿入されている。挿入箇所の多穴管１００の内周面と各分岐管１１０、１１０の外周面の間がロー付けで固定されている。ロー付け作業は、多穴管１００の端面上で、且つ、多穴管１００より外方に突き出た各分岐管１１０、１１０の外周に沿ってロー材（図示せず）を置く。そして、多穴管１００を下位置、２本の分岐管１１０、１１０を上位置とした状態に配置して加熱することによって行う。   Then, the end portions 110a and 110a of the branch pipes 110 and 110 are inserted into the communication pipes 102 and 102 at the end portions of the multi-hole tube 100, respectively. A space between the inner peripheral surface of the multi-hole pipe 100 at the insertion location and the outer peripheral surface of each branch pipe 110, 110 is fixed by brazing. In the brazing operation, a brazing material (not shown) is placed on the end face of the multi-hole tube 100 and along the outer periphery of each branch pipe 110, 110 protruding outward from the multi-hole tube 100. And it arrange | positions in the state which made the multi-hole pipe | tube 100 the lower position, and the two branch pipes 110 and 110 the upper position, and it heats.

特開２００４−１５６９００号公報JP 2004-156900 A

しかしながら、上述した従来の配管の接続構造では、多穴管１００の端部より外方に配置される２つの分岐管１１０、１１０が仕切壁１０３の壁厚を介してしか離間していないため、各分岐管１１０、１１０の全周にロー材を流し込むことができず、多穴管１００と各分岐管１１０、１１０の間をロー付けで良好に接続できないという問題がある。   However, in the conventional pipe connection structure described above, the two branch pipes 110 and 110 arranged outward from the end of the multi-hole pipe 100 are separated only through the wall thickness of the partition wall 103. There is a problem that the brazing material cannot be poured into the entire circumference of each branch pipe 110, 110, and the multi-hole pipe 100 and each branch pipe 110, 110 cannot be connected well by brazing.

そこで、本発明は、多穴管と分岐管の間を確実に、且つ容易に接続できる配管の接続構造を提供することを目的とする。   Then, an object of this invention is to provide the connection structure of piping which can connect between a multi-hole pipe and a branch pipe reliably and easily.

上記の目的を達成するため請求項１の発明は、外管部内が仕切壁によって複数の連通穴に分割された多穴管の端部の各連通穴に、複数の分岐管の端部がそれぞれ挿入され、前記多穴管と前記分岐管の間がロー付けで固定される配管の接続構造であって、前記分岐管の端部に曲がり部が設けられ、前記曲がり部は前記仕切壁の先端面より分岐管挿入方向の奥側に配置され、プレス加工で前記多穴管の開口部に対して前記分岐管ののそれぞれの中心をオフセットし、前記多穴管の端部にフレア部を設け、前記仕切壁の端部と前記フレア部との間は離間し、前記仕切壁の端部と前記フレア部との間にはロー材流通スペースが形成されていることを特徴とする。 In order to achieve the above object, the invention according to claim 1 is characterized in that the end portions of the plurality of branch pipes are respectively connected to the communication holes of the end portions of the multi-hole tube in which the outer tube portion is divided into the plurality of communication holes by the partition wall. A pipe connection structure that is inserted and fixed between the multi-hole pipe and the branch pipe by brazing, wherein a bent portion is provided at an end of the branch pipe, and the bent portion is a tip of the partition wall It is arranged on the back side of the branch pipe insertion direction from the surface, and the center of each of the branch pipes is offset with respect to the opening of the multi-hole pipe by pressing, and a flare is provided at the end of the multi-hole pipe The end portion of the partition wall and the flare portion are separated from each other, and a brazing material distribution space is formed between the end portion of the partition wall and the flare portion.

請求項１に係る発明によれば、多穴管の開口部に対して分岐管の中心がオフセットしているので、各分岐管間に比較的大きな間隔を形成でき、各分岐管の全周にロー材を置くことができる。従って、多穴管と分岐管の間を確実に、且つ容易に接続できる。また、仕切壁の端部とフレア部との間に、ロー材流通スペースが形成されているので、多穴管のフレア部で形成される円周上の隙間が仕切壁によって遮断されずにロー材流通スペースを介して連通するため、各分岐管の外周面に流れ込んだロー材が隣接する分岐管の外周面にも流出入する。さらに、２本の分岐管の曲がり部によって分岐管が離間するため、各分岐管の全周に沿ってロー材を置くことができる。従って、各分岐管の全外周に亘ってより均一にロー材を流し込むことができ、多穴管と分岐管間を接続するロー付けの信頼性がさらに高まる。 According to the invention of claim 1, since the center of the branch pipe is offset with respect to the opening of the multi-hole pipe, a relatively large interval can be formed between the branch pipes, and the entire circumference of each branch pipe can be formed. Raw wood can be placed. Therefore, the multi-hole pipe and the branch pipe can be reliably and easily connected. Also, since a brazing material distribution space is formed between the end of the partition wall and the flare portion, the circumferential gap formed by the flare portion of the multi-hole tube is not blocked by the partition wall and Since it communicates via the material distribution space, the brazing material that has flowed into the outer peripheral surface of each branch pipe also flows into and out of the outer peripheral surface of the adjacent branch pipe. Further, since the branch pipes are separated by the bent portions of the two branch pipes, the brazing material can be placed along the entire circumference of each branch pipe. Therefore, the brazing material can be poured more uniformly over the entire outer periphery of each branch pipe, and the reliability of brazing for connecting between the multi-hole pipe and the branch pipe is further enhanced.

本発明の第１実施形態を示し、多穴管と２本の分岐管からなる配管の接続構造を示す断面図である。It is sectional drawing which shows 1st Embodiment of this invention and shows the connection structure of piping which consists of a multi-hole pipe and two branch pipes. 本発明の第１実施形態を示し、図1のＡ部の拡大図である。FIG. 2 shows the first embodiment of the present invention and is an enlarged view of a portion A in FIG. 1. 本発明の第１実施形態を示し、多穴管の側面図である。1 shows a first embodiment of the present invention and is a side view of a multi-hole tube. FIG. 本発明の第１実施形態を示し、図３のＢ−Ｂ線断面図である。FIG. 4 shows the first embodiment of the present invention and is a cross-sectional view taken along line BB in FIG. 3. 本発明の第１実施形態を示し、図３のＣ−Ｃ線断面図である。FIG. 4 shows the first embodiment of the present invention and is a cross-sectional view taken along the line CC of FIG. 3. 本発明の第１実施形態を示し、（ａ）は分岐管の平面図、（ｂ）は分岐管の側面図、（ｃ）は図６（ａ）のＤ−Ｄ線断面図である。The 1st Embodiment of this invention is shown, (a) is a top view of a branch pipe, (b) is a side view of a branch pipe, (c) is the DD sectional view taken on the line of Fig.6 (a). 本発明の第１実施形態を示し、分岐管の成形方法を示すフローチャートである。It is a flowchart which shows 1st Embodiment of this invention and shows the shaping | molding method of a branch pipe. 本発明の第１実施形態を示し、成形加工する前の分岐管のセット工程を示す図である。It is a figure which shows 1st Embodiment of this invention and shows the setting process of the branch pipe before shaping | molding. 本発明の第１実施形態を示し、分岐管のクランプ工程を示す図である。It is a figure which shows 1st Embodiment of this invention and shows the clamp process of a branch pipe. 本発明の第１実施形態を示し、分岐管の端部成形及び曲げ工程を示す図である。It is a figure which shows 1st Embodiment of this invention and shows the edge part shaping | molding and bending process of a branch pipe. 本発明の第１実施形態を示し、図９のＥ−Ｅ線断面図である。FIG. 10 shows the first embodiment of the present invention and is a cross-sectional view taken along the line EE of FIG. 9. 本発明の第２実施形態を示し、分岐管の成形方法を示すフローチャートである。It is a flowchart which shows 2nd Embodiment of this invention and shows the shaping | molding method of a branch pipe. 本発明の第２実施形態を示し、成形加工する前の分岐管のセット工程を示す図である。It is a figure which shows 2nd Embodiment of this invention and shows the setting process of the branch pipe before shaping | molding. 本発明の第２実施形態を示し、分岐管端部の成形工程を示す図である。It is a figure which shows 2nd Embodiment of this invention and shows the formation process of a branch pipe end part. 本発明の第２実施形態を示し、分岐管の曲げ工程を示す図である。It is a figure which shows 2nd Embodiment of this invention and shows the bending process of a branch pipe. 本発明の第２実施形態を示し、図１５のＦ−Ｆ線断面図である。FIG. 16 shows a second embodiment of the present invention and is a cross-sectional view taken along line FF in FIG. 15. 本発明の第２実施形態を示し、分岐管の成形前の状態と成形後の状態を示す断面図である。It is sectional drawing which shows 2nd Embodiment of this invention and shows the state before shaping | molding of a branch pipe, and the state after shaping | molding. 本発明の第２実施形態を示し、分岐管の端部を成形する上金型及び下金型の側面図である。It is a side view of the upper metal mold | die and lower metal mold | die which show 2nd Embodiment of this invention and shape | mold the edge part of a branch pipe. 多穴管と２本の分岐管からなる配管の従来例を示す斜視図である。It is a perspective view which shows the prior art example of piping which consists of a multi-hole pipe and two branch pipes. 図１９に示す配管の断面図である。It is sectional drawing of piping shown in FIG.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１〜図１１は本発明の第１実施形態を示し、図１は多穴管１と２本の分岐管１０からなる配管９の接続構造を示す断面図、図２は図１のＡ部の拡大図、図３は多穴管１の側面図、図４は図３のＢ−Ｂ線断面図、図５は図３のＣ−Ｃ線断面図、図６（ａ）は分岐管１０の平面図、図６（ｂ）は分岐管１０の側面図、図６（ｃ）は図６（ａ）のＤ−Ｄ線断面図、図７は分岐管１０の成形方法を示すフローチャート、図８は成形加工する前の分岐管１０のセット工程を示す図、図９は分岐管１０のクランプ工程を示す図、図１０は分岐管１０の端部成形及び曲げ工程を示す図、図１１は図９のＥ−Ｅ線断面図である。   1 to 11 show a first embodiment of the present invention. FIG. 1 is a sectional view showing a connection structure of a pipe 9 composed of a multi-hole pipe 1 and two branch pipes 10, and FIG. 3 is a side view of the multi-hole tube 1, FIG. 4 is a cross-sectional view taken along line BB of FIG. 3, FIG. 5 is a cross-sectional view taken along line CC of FIG. 3, and FIG. 6 (b) is a side view of the branch pipe 10, FIG. 6 (c) is a sectional view taken along the line DD of FIG. 6 (a), and FIG. 7 is a flowchart showing a method for forming the branch pipe 10. 8 is a diagram illustrating a setting process of the branch pipe 10 before forming, FIG. 9 is a diagram illustrating a clamping process of the branch pipe 10, FIG. 10 is a diagram illustrating an end molding and bending process of the branch pipe 10, and FIG. It is the EE sectional view taken on the line of FIG.

図１に示すように、多穴管１の端部に２つの分岐管１０，１０がロー付けで接続されることによって配管９が分岐されている。   As shown in FIG. 1, the pipe 9 is branched by connecting two branch pipes 10 and 10 to the end of the multi-hole pipe 1 by brazing.

多穴管１は、図３〜図５に示すように、円筒状の外管部２と、この外管部２の内部を等分に仕切る仕切壁３とから構成されている。外管部２の内部には仕切壁３を境として２つの連通穴４、４が形成されている。各連通穴４、４は、その断面形状が同一寸法の半円形状（すなわちＤ形状）であり、外管部２の長手形状の端面で開口されている。   As shown in FIGS. 3 to 5, the multi-hole tube 1 includes a cylindrical outer tube portion 2 and a partition wall 3 that equally partitions the inside of the outer tube portion 2. Two communication holes 4, 4 are formed inside the outer pipe portion 2 with the partition wall 3 as a boundary. Each of the communication holes 4, 4 has a semicircular shape (that is, D shape) having the same cross-sectional shape, and is opened at the end face of the outer tube portion 2 in the longitudinal shape.

多穴管１の端部には、開口側に向かって位置決め用段差部５、拡径部６及びロー付材保持部であるフレア部７がこの順に形成されている。位置決め用段差部５は、開口側に向うに従って徐々に拡径する形状であり、その内周面は円錐面に形成されている。拡径部６は、位置決め用段差部５に連続して設けられ、位置決め用段差部５の最大径と同一径の円筒形状に形成されている。フレア部７は、拡径部６に連続して設けられ、開口に向かって徐々に拡径するテーパ形状に形成されている。   At the end of the multi-hole tube 1, a positioning stepped portion 5, an enlarged diameter portion 6, and a flare portion 7 as a brazing material holding portion are formed in this order toward the opening side. The positioning step portion 5 has a shape that gradually increases in diameter toward the opening side, and an inner peripheral surface thereof is formed in a conical surface. The enlarged diameter portion 6 is provided continuously to the positioning step portion 5 and is formed in a cylindrical shape having the same diameter as the maximum diameter of the positioning step portion 5. The flare portion 7 is provided continuously with the diameter-expanded portion 6 and is formed in a tapered shape that gradually increases in diameter toward the opening.

仕切壁３は、２つの連通穴４、４の互いの気密性を保持するために、端部を除いては外管部２の内周面に密着状態で固着されている。仕切壁３の端部とフレア部７との間は離間され、双方の間にはロー材流通スペース８が形成されている。   The partition wall 3 is fixed in close contact with the inner peripheral surface of the outer tube portion 2 except for the end portions in order to maintain the airtightness of the two communication holes 4 and 4. The end portion of the partition wall 3 and the flare portion 7 are separated from each other, and a brazing material distribution space 8 is formed between the both ends.

各分岐管１０は、図６（ａ）〜（ｃ）に示すように、端部を除いて同一形状、同一寸法の円筒形状である。各分岐管１０の端部には、開口側に向かってＤ形状遷移部１１とＤ形状部１２がこの順に形成されている。Ｄ形状遷移部１１は、円筒形状より徐々にＤ形筒状へと形状を変形させる形態に形成されている。Ｄ形状部１２は、仕切壁３に接する平面部１２ａと外管部２に接する弧状部１２ｂとからなり断面がＤ形状に形成されている。Ｄ形状部１２の外径寸法は、多穴管１の各連通穴４の基準寸法より大きく、且つ、拡径部６の内径寸法より小さい寸法に設定されている。   As shown in FIGS. 6A to 6C, each branch pipe 10 has a cylindrical shape having the same shape and the same dimensions except for the end portions. A D-shaped transition part 11 and a D-shaped part 12 are formed in this order at the end of each branch pipe 10 toward the opening side. The D-shaped transition portion 11 is formed in a form that gradually changes its shape from a cylindrical shape to a D-shaped cylindrical shape. The D-shaped portion 12 includes a flat surface portion 12a that contacts the partition wall 3 and an arc-shaped portion 12b that contacts the outer tube portion 2, and has a D-shaped cross section. The outer diameter dimension of the D-shaped portion 12 is set to be larger than the reference dimension of each communication hole 4 of the multi-hole tube 1 and smaller than the inner diameter dimension of the expanded diameter portion 6.

また、Ｄ形状部１２とＤ形状遷移部１１のほぼ境界位置には、曲がり部１３が設けられている。曲がり部１３は、図２に詳しく示すように、多穴管１の端部に挿入された状態で仕切壁３の先端面３ａより寸法ｄだけ奥に入り込んだ位置となっている。   Further, a bent portion 13 is provided at a substantially boundary position between the D-shaped portion 12 and the D-shaped transition portion 11. As shown in detail in FIG. 2, the bent portion 13 is located at a depth d from the distal end surface 3 a of the partition wall 3 while being inserted into the end portion of the multi-hole tube 1.

次に、各分岐管１０の成形方法を図７〜図１１を用いて説明する。この成形方法では、図８〜図１１に示すように下型２１及び上型２２が用いられている。下型２１上には、支持部材２３、芯金２４、下金型２５及び下クランプ２６が設けられ、上型２２下には、芯金押え部材２７、上金型２８及び上クランプ２９が設けられている。   Next, a method for forming each branch pipe 10 will be described with reference to FIGS. In this molding method, a lower mold 21 and an upper mold 22 are used as shown in FIGS. A support member 23, a core metal 24, a lower mold 25, and a lower clamp 26 are provided on the lower mold 21, and a core metal holding member 27, an upper mold 28, and an upper clamp 29 are provided below the upper mold 22. It has been.

支持部材２３は、スプリング３０を介して上下動自在に下型２１に取り付けられている。芯金押え部材２７は、支持部材２３を上方より下方へ押圧可能である。芯金２４は、分岐管１０の端部の内径より小さいD形状の断面を有し、支持部材２３より側方に突出してパイプ材３１の端部３１ａ内に挿入される。なお、パイプ材３１は、分岐管１０に成形加工する前の部材であり、あらかじめ拡径された端部３１ａと、その他の円筒部３１ｂとから構成されている。   The support member 23 is attached to the lower mold 21 via a spring 30 so as to be movable up and down. The metal core presser member 27 can press the support member 23 downward from above. The core metal 24 has a D-shaped cross section smaller than the inner diameter of the end portion of the branch pipe 10, protrudes laterally from the support member 23, and is inserted into the end portion 31 a of the pipe material 31. The pipe material 31 is a member before being formed into the branch pipe 10, and is composed of an end portion 31a whose diameter has been expanded in advance and another cylindrical portion 31b.

図１１に示すように、下金型２５は平坦状の上面を有し、パイプ材３１の端部３１ａの下側平坦部を押圧成形する。上金型２８は下側に略半円筒状の凹部３２を有し、パイプ材３１の端部３１ａの上側湾曲部を押圧成形する。   As shown in FIG. 11, the lower mold 25 has a flat upper surface, and presses the lower flat portion of the end portion 31 a of the pipe material 31. The upper mold 28 has a substantially semi-cylindrical recess 32 on the lower side, and press-molds the upper curved portion of the end portion 31 a of the pipe material 31.

上クランプ２９は、上型２２に弾性体、例えばウレタンゴム３３を介して取り付けられ、上型２２に対して上下動可能である。この上クランプ２９及び下クランプ２６によって、パイプ材３１の円筒部３１ｂが保持される。   The upper clamp 29 is attached to the upper mold 22 via an elastic body, for example, urethane rubber 33 and can move up and down with respect to the upper mold 22. The upper clamp 29 and the lower clamp 26 hold the cylindrical portion 31 b of the pipe material 31.

まず図７の手順Ｓ１として、図８に示すように上型２２及び下型２１間にワーク、すなわち分岐管１０に成形加工する前のパイプ材３１を配置する。このとき、パイプ材３１の円筒部３１ｂを下クランプ２６上に置いて、パイプ材３１の端部３１ａ内に芯金２４を挿入し、手順Ｓ２として、図９に示すように、上型２２を下降して上クランプ２９と下クランプ２６でパイプ材３１の円筒部３１ｂを把持し、ウレタンゴム３３の反発力でパイプ材３１を固定する。   First, as a procedure S1 in FIG. 7, as shown in FIG. 8, a pipe material 31 before being processed into the work, that is, the branch pipe 10, is arranged between the upper mold 22 and the lower mold 21. At this time, the cylindrical portion 31b of the pipe material 31 is placed on the lower clamp 26, the core metal 24 is inserted into the end portion 31a of the pipe material 31, and as shown in FIG. The upper clamp 29 and the lower clamp 26 hold down the cylindrical portion 31 b of the pipe material 31, and the pipe material 31 is fixed by the repulsive force of the urethane rubber 33.

手順Ｓ３として、図１０に示すように上型２２をさらに下降して上金型２８でパイプ材３１の端部３１ａを押し下げるとともに、芯金押え部材２７で支持部材２３を介して芯金２４を押し下げることにより、パイプ材３１の端部３１ａをＤ字形状に成形し、同時にパイプ材３１を曲げる。なお、芯金２４の断面は分岐管１０の端部の内径より小さいＤ形状に形成されているが、上述したように下金型２５及び上金型２８で分岐管１０の上下方向から挟圧するとともに、分岐管１０の端部内面のうち、平坦面及び湾曲面の各一部に対して芯金２４が圧設することによって、分岐管１０の端部をＤ形状に成形することができる。   As shown in FIG. 10, as shown in FIG. 10, the upper die 22 is further lowered to push down the end 31 a of the pipe material 31 with the upper die 28, and the core metal 24 is moved through the support member 23 with the core metal holding member 27. By pushing down, the end 31a of the pipe material 31 is formed into a D-shape, and the pipe material 31 is bent at the same time. The cross section of the cored bar 24 is formed in a D shape smaller than the inner diameter of the end of the branch pipe 10, but as described above, the lower mold 25 and the upper mold 28 are clamped from above and below the branch pipe 10. At the same time, the end portion of the branch pipe 10 can be formed into a D shape by pressing the cored bar 24 against each of the flat surface and the curved surface of the inner surface of the end portion of the branch pipe 10.

このようにして分岐管１０の成形を完了した後、手順Ｓ４として、成形後のワーク、すなわち分岐管１０を取り外す。   After completing the forming of the branch pipe 10 in this manner, the work after forming, that is, the branch pipe 10 is removed as step S4.

次に、多穴管１と分岐管１０の接続手順を説明する。多穴管１の端部の各連通穴４，４に２本の分岐管１０，１０の端部をそれぞれ挿入し、各分岐管１０，１０の先端面が位置決め用段差部５に突き当たるまで挿入する。次に図２の仮想線で示すように、多穴管１の端面上で、且つ、多穴管１より外方へ突き出た各分岐管１０，１０の全外周に沿ってロー材１４を置く。ここで、２本の分岐管１０，１０の曲がり部１３，１３によって離間するため、各分岐管１０，１０の全周にロー材１４を置くことができる。尚、分岐管１０、１０の先端面は、位置決め用段差部５に必ずしも突き当てなくともよい。   Next, a procedure for connecting the multi-hole pipe 1 and the branch pipe 10 will be described. Insert the end portions of the two branch pipes 10 and 10 into the respective communication holes 4 and 4 at the end of the multi-hole tube 1 and insert them until the end surfaces of the branch pipes 10 and 10 abut against the positioning stepped portion 5. To do. Next, as shown by the phantom lines in FIG. 2, the brazing material 14 is placed on the end face of the multi-hole tube 1 and along the entire outer periphery of each branch pipe 10, 10 protruding outward from the multi-hole tube 1. . Here, since the two branch pipes 10 and 10 are separated by the bent portions 13 and 13, the brazing material 14 can be placed on the entire circumference of each branch pipe 10 and 10. The tip surfaces of the branch pipes 10 and 10 do not necessarily have to abut against the positioning step portion 5.

次に、多穴管１を下位置、２本の分岐管１０，１０を上位置とした配置で加熱室にセットし、加熱する。この加熱によって溶融したロー材１４は重力によって下方に流下し、流下したロー材１４は多穴管１の内周面と分岐管１０，１０の外周面との間に流入する。この流入したロー材１４は、加熱処理後の冷却処理によって固化され、フィレット１５が形成される。ロー材１４は各分岐管１０，１０の全外周に亘ってロー材１４が流入し、各分岐管１０，１０の全周に亘ってフィレット１５が形成される。以上より、各分岐管１０，１０の全周に亘って均一にロー材１４を流し込むことができ、多穴管１と分岐管１０，１０の間をロー付けで良好に接続できる。   Next, the multi-hole tube 1 is set in the heating chamber in an arrangement in which the multi-hole tube 1 is in the lower position and the two branch tubes 10 and 10 are in the upper position, and heated. The brazing material 14 melted by this heating flows down due to gravity, and the flowing brazing material 14 flows between the inner peripheral surface of the multi-hole tube 1 and the outer peripheral surfaces of the branch tubes 10 and 10. The inflowing brazing material 14 is solidified by the cooling process after the heat process, and the fillet 15 is formed. The brazing material 14 flows into the entire circumference of each branch pipe 10, 10, and a fillet 15 is formed over the entire circumference of each branch pipe 10, 10. As described above, the brazing material 14 can be poured uniformly over the entire circumference of each branch pipe 10, 10, and the multi-hole pipe 1 and the branch pipes 10, 10 can be well connected by brazing.

また、分岐管１０，１０の曲がり部１３，１３が多穴管１の仕切壁３より奥位置に配置されることから仕切壁３と分岐管１０，１０の端部との間への進入を容易とし、溶融されたロー材１４が仕切壁３の先端面３ａを伝わって多穴管１の外周面に流出する事態を阻止できる。   In addition, since the bent portions 13 and 13 of the branch pipes 10 and 10 are disposed at a position deeper than the partition wall 3 of the multi-hole pipe 1, the entry between the partition wall 3 and the end portions of the branch pipes 10 and 10 is prevented. This makes it easy to prevent the molten brazing material 14 from flowing through the front end surface 3 a of the partition wall 3 and flowing out to the outer peripheral surface of the multi-hole tube 1.

この第１実施形態では、多穴管１の端部の連通穴４，４に各分妓管１０，１０を挿入したとき、多穴管１の開口部に対して分岐管１０，１０の各中心がオフセットし、各分岐管１０，１０間に比較的大きな間隔が空いているので、各分岐管１０，１０の全周にロー材１４を置くことができ、多穴管１および各分岐管１０，１０を確実に、且つ容易に接続することができる。   In the first embodiment, when the dividing tubes 10 and 10 are inserted into the communication holes 4 and 4 at the end of the multi-hole tube 1, each of the branch tubes 10 and 10 is inserted into the opening of the multi-hole tube 1. Since the center is offset and there is a relatively large space between the branch pipes 10, 10, the brazing material 14 can be placed on the entire circumference of each branch pipe 10, 10. 10 and 10 can be reliably and easily connected.

この第１実施形態では、外管部２の端部の外周に、ロー材１４を保持するロー材保持部であるフレア部７が設けられているので、外管部２の内周面と各分岐管１０，１０の外周面との間にフレア部７によって間口を大きく開けた隙間が形成され、この隙間に溶融されたロー材１４が確実に流入され、且つ、この隙間に保持されるため、各分岐管１０，１０の全周に亘って均一にフィレット１５が形成される。   In this 1st Embodiment, since the flare part 7 which is the brazing material holding | maintenance part which hold | maintains the brazing material 14 is provided in the outer periphery of the edge part of the outer tube | pipe part 2, each inner peripheral surface of the outer tube | pipe part 2 and each A gap having a wide opening is formed by the flare portion 7 between the outer peripheral surfaces of the branch pipes 10 and 10, and the brazing material 14 melted into the gap is surely flowed and held in this gap. The fillet 15 is uniformly formed over the entire circumference of each branch pipe 10, 10.

この第１実施形態では、外管部２の端部に、開口側に向かうに従って徐々に拡径する位置決め用段差部５が設けられたので、各分岐管１０，１０を多穴管１の位置決め用段差部５に突き当たるまで挿入すれば、各分岐管１０，１０を所定長さだけ容易に、且つ、確実に挿入できる。また、多穴管１と各分岐管１０，１０をロー付けで固定するまでは、各分岐管１０，１０の多穴管１への挿入長さを所定長さに維持しておく必要があるがその維持が容易である。以上より、多穴管１と各分岐管１０，１０との接続作業性が良い。   In the first embodiment, since the positioning step portion 5 that gradually increases in diameter toward the opening side is provided at the end of the outer tube portion 2, each branch tube 10, 10 is positioned in the multi-hole tube 1. If it inserts until it contacts the level | step-difference part 5, each branch pipe 10 and 10 can be inserted by predetermined length easily and reliably. Further, until the multi-hole pipe 1 and the branch pipes 10 and 10 are fixed by brazing, it is necessary to maintain the insertion length of the branch pipes 10 and 10 into the multi-hole pipe 1 at a predetermined length. However, it is easy to maintain. From the above, the connection workability between the multi-hole pipe 1 and the branch pipes 10 and 10 is good.

この第１実施形態では、外管部２の端部に、位置決め用段差部５に連続し、且つ、位置決め用段差部５の最大径と同一径の拡径部６が設けられているので、多穴管１に挿入した各分岐管１０，１０の端部を拡径部６が保持し、各分岐管１０，１０が多穴管１より外れないように位置決めするため、多穴管１と各分岐管１０，１０をロー付けで固定するまでの仮位置決めが容易である。以上より、多穴管１と各分岐管１０，１０との接続作業性が良い。   In the first embodiment, the end portion of the outer tube portion 2 is provided with an enlarged diameter portion 6 that is continuous with the positioning step portion 5 and has the same diameter as the maximum diameter of the positioning step portion 5. The end portions of the branch pipes 10 and 10 inserted into the multi-hole pipe 1 are held by the enlarged diameter portion 6 and positioned so that the branch pipes 10 and 10 are not detached from the multi-hole pipe 1. Temporary positioning until each branch pipe 10, 10 is fixed by brazing is easy. From the above, the connection workability between the multi-hole pipe 1 and the branch pipes 10 and 10 is good.

この第１実施形態では、仕切壁３の端部とフレア部７との間に、ロー材流通スペース８が形成されているので、多穴管１のフレア部７で形成される円周上の隙間が仕切壁３によって遮断されずにロー材流通スペース８を介して連通するため、各分岐管１０，１０の外周面に流れ込んだロー材１４が隣接する分岐管１０，１０の外周面にも流出入する。従って、各分岐管１０，１０の全外周に亘ってより均一にロー材１４を流し込むことができ、多穴管１と分岐管１０，１０間を接続するロー付けの信頼性がさらに高まる。   In this 1st Embodiment, since the brazing material distribution | circulation space 8 is formed between the edge part of the partition wall 3, and the flare part 7, on the circumference formed with the flare part 7 of the multi-hole pipe 1 Since the gap communicates through the brazing material distribution space 8 without being blocked by the partition wall 3, the brazing material 14 that has flowed into the outer circumferential surface of each branch pipe 10, 10 is also present on the outer circumferential surface of the adjacent branch pipes 10, 10. Inflow and outflow. Therefore, the brazing material 14 can be poured more uniformly over the entire outer periphery of each branch pipe 10, 10, and the brazing reliability connecting the multi-hole pipe 1 and the branch pipes 10, 10 is further increased.

この第１実施形態では、図７の手順Ｓ３にて分岐管１０の端部成形及び曲げを同時に行うので、作業工数を削減して効率的に分岐管１０に成形処理を施すことができる。   In this 1st Embodiment, since the edge part shaping | molding and bending of the branch pipe 10 are performed simultaneously in procedure S3 of FIG. 7, a work process can be reduced and a shaping process can be performed to the branch pipe 10 efficiently.

この第１実施形態では、分岐管１０に成形加工する前のパイプ材３１の端部３１ａ内に、Ｄ形状の断面を有する芯金２４を挿入した状態で、パイプ材３１の端部３１ａのＤ形状加工を行うので、この端部３１ａの局部的な変形を防止することができ、パイプ材３１の端部３１を良好なＤ形状に成形することができる。   In this 1st Embodiment, D of the end part 31a of the pipe material 31 in the state which inserted the metal core 24 which has a D-shaped cross section in the end part 31a of the pipe material 31 before shaping | molding into the branch pipe 10. FIG. Since the shape processing is performed, local deformation of the end portion 31a can be prevented, and the end portion 31 of the pipe material 31 can be formed into a good D shape.

この第１実施形態では、分岐管１０、１０の挿入端部と反対側端部が互いに平行であるので、ロー付け時に分岐管１０、１０を安定した状態に固定でき、この点でもロー付けの信頼性が高まる。また、分岐管１０、１０の長さが異なることにより、種々様々な流路長さのものに適用することができる。   In the first embodiment, since the insertion end portion and the opposite end portion of the branch pipes 10 and 10 are parallel to each other, the branch pipes 10 and 10 can be fixed in a stable state at the time of brazing. Increased reliability. Further, since the lengths of the branch pipes 10 and 10 are different, the present invention can be applied to a variety of channel lengths.

この第１実施形態では、多穴管１の拡径した端部に分岐管１０を挿入してロー付けするようになっているので、多穴管１の端部に挿入した分岐管１０の肉厚で多穴管１の端部の断面積が多少減少しても、この多穴管１の端部の断面積を十分に確保することができる。   In the first embodiment, the branch pipe 10 is inserted and brazed to the end of the multi-hole pipe 1 whose diameter has been expanded, so that the thickness of the branch pipe 10 inserted into the end of the multi-hole pipe 1 is increased. Even if the cross-sectional area of the end portion of the multi-hole tube 1 is somewhat reduced due to the thickness, the cross-sectional area of the end portion of the multi-hole tube 1 can be sufficiently ensured.

図１２〜図１８は本発明の第２実施形態を示し、図１２は分岐管１０の成形方法を示すフローチャート、図１３は成形加工する前の分岐管１０のセット工程を示す図、図１４は分岐管１０端部の成形工程を示す図、図１５は分岐管１０の曲げ工程を示す図、図１６は図１５のＦ−Ｆ線断面図、図１７は分岐管１０の成形前の状態と成形後の状態を示す断面図、図１８は分岐管１０の端部を成形する上金型及び下金型の側面図である。なお、図１３〜図１７において前述した図１〜図１２に示す第１実施形態と同等のものには同一符号を付してある。   12 to 18 show a second embodiment of the present invention, FIG. 12 is a flowchart showing a method of forming the branch pipe 10, FIG. 13 is a diagram showing a setting process of the branch pipe 10 before forming, and FIG. FIG. 15 is a diagram showing a process of forming the end of the branch pipe 10, FIG. 15 is a diagram showing a bending process of the branch pipe 10, FIG. 16 is a cross-sectional view taken along the line FF of FIG. FIG. 18 is a side view of an upper mold and a lower mold for molding the end portion of the branch pipe 10. In FIG. 13 to FIG. 17, the same components as those in the first embodiment shown in FIG. 1 to FIG.

この第２実施形態では、前述した図１〜図１２に示す第１実施形態と比べて、分岐管１０の成形方法が異なっており、その他の点は基本的に同様である。   In the second embodiment, the method of forming the branch pipe 10 is different from that of the first embodiment shown in FIGS. 1 to 12 described above, and the other points are basically the same.

この第２実施形態の成形方法では、下型２１上に、支持部材４１、芯金４２、下金型４３及び下クランプ４４が設けられ、上型２２下には、上金型４５及び上クランプ４６が設けられている。   In the molding method of the second embodiment, a support member 41, a core metal 42, a lower mold 43, and a lower clamp 44 are provided on the lower mold 21, and an upper mold 45 and an upper clamp are provided below the upper mold 22. 46 is provided.

支持部材２３は、下型２１上に固定されている。芯金４２は、分岐管１０の端部の内径より小さいD形状の断面を有し、回転支点４７を介して支持部材４１により回動可能に支持されている。   The support member 23 is fixed on the lower mold 21. The core metal 42 has a D-shaped cross section smaller than the inner diameter of the end portion of the branch pipe 10, and is rotatably supported by the support member 41 via a rotation fulcrum 47.

図１８に示すように、下金型４３は上側に略半円筒状の凹部４８を有し、パイプ材３１の端部３１ａの下側湾曲部を押圧成形する。上金型４５は平坦状の下面を有し、パイプ材３１の端部３１ａの上側平坦部を押圧成形する。   As shown in FIG. 18, the lower mold 43 has a substantially semi-cylindrical recess 48 on the upper side, and press-molds the lower curved portion of the end 31 a of the pipe material 31. The upper mold 45 has a flat lower surface and press-molds the upper flat portion of the end portion 31 a of the pipe material 31.

上クランプ４６は、上型２２に弾性体、例えばウレタンゴム４９を介して取り付けられ、上型２２に対して上下動可能である。この上クランプ４６及び下クランプ４４によって、パイプ材３１の円筒部３１ｂが保持される。   The upper clamp 46 is attached to the upper mold 22 via an elastic body, for example, urethane rubber 49, and can move up and down with respect to the upper mold 22. The upper clamp 46 and the lower clamp 44 hold the cylindrical portion 31 b of the pipe material 31.

この第２実施形態にあっては、図１２の手順Ｓ１１として、図１３に示すように上型２２及び下型２１間にワーク、すなわち分岐管１０に成形加工する前のパイプ材３１を配置する。このとき、パイプ材３１の端部３１ａを下金型４３上に置いてパイプ材３１の端部３１ａ内に芯金４２を挿入する。手順Ｓ１２として、図１４に示すように、上型２２を下降して上金型４５と下金型４３でパイプ材３１の端部３１ａを押圧して把持するとともに押しつぶすことにより、パイプ材３１の端部３１ａをＤ字形状に成形する。このとき、芯金４２が回転支点４７を中心として回動しながらパイプ材３１の端部３１ａを内側から押圧する。次いで、手順Ｓ１３として、図１５に示すように、上型２２をさらに下降してウレタンゴム４９の反発力でパイプ材３１の端部３１ａを把持した状態で、上クランプ４６でパイプ材３１の円筒部３１ｂを押し下げることによってパイプ材３１を曲げることにより、分岐管１０の成形を完了した後、手順Ｓ１４として、成形後のワーク、すなわち分岐管１０を取り外す。   In the second embodiment, as step S11 in FIG. 12, the pipe material 31 before being processed into the work, that is, the branch pipe 10, is arranged between the upper die 22 and the lower die 21 as shown in FIG. . At this time, the end 31 a of the pipe material 31 is placed on the lower mold 43 and the core metal 42 is inserted into the end 31 a of the pipe material 31. As shown in FIG. 14, as shown in FIG. 14, the upper mold 22 is lowered and the end 31 a of the pipe material 31 is pressed and held by the upper mold 45 and the lower mold 43, and the pipe material 31 is pressed. The end 31a is formed into a D shape. At this time, the cored bar 42 presses the end 31 a of the pipe member 31 from the inside while rotating around the rotation fulcrum 47. Next, in step S13, as shown in FIG. 15, the upper die 22 is further lowered and the end 31a of the pipe member 31 is gripped by the repulsive force of the urethane rubber 49, and the cylinder of the pipe member 31 is clamped by the upper clamp 46. After the pipe material 31 is bent by pushing down the portion 31b, the forming of the branch pipe 10 is completed, and then the molded workpiece, that is, the branch pipe 10 is removed as step S14.

この第２実施形態では、図１２の手順Ｓ１２にて分岐管１０の把持及び端部成形を同時に行うので、作業工数を削減して効率的に分岐管１０に成形処理を施すことができる。   In the second embodiment, the branch pipe 10 is gripped and end-formed at the same time in step S12 of FIG. 12, so that the number of work steps can be reduced and the branch pipe 10 can be efficiently processed.

なお、上記実施形態にあっては、パイプ材３１の端部３１ａを拡径してプレス加工を施すことにより、分岐管１０の端部を円筒状からＤ形状に成形するようにしたが、本発明はこれに限定されず、パイプ材３１の端部３１ａを拡径するとともに、この端部３１ａの断面を楕円状に加工した後にプレス加工を施すことによって、分岐管１０の端部をより良好な状態でＤ形状に成形することができる。   In the above embodiment, the end portion 31a of the pipe material 31 is expanded and subjected to press working to form the end portion of the branch pipe 10 from a cylindrical shape to a D shape. The invention is not limited to this, and the end portion 31a of the pipe material 31 is expanded, and the end portion of the branch pipe 10 is made better by pressing after the cross section of the end portion 31a is processed into an elliptical shape. It can be formed into a D shape in such a state.

また、上記実施形態では、ロー材保持部は、開口に向かって徐々に拡径するフレア部７であるが、多穴管１の内周面と分岐管１０，１０の外周面との間に所定の隙間を形成できる構成であればよい。また、多穴管１の端部の拡径部６は、図３の様に全周方向に設けているが、仕切壁３に沿った方向への拡径をせず、仕切壁に対し垂直方向の拡径だけでも良い。   Moreover, in the said embodiment, although a brazing material holding | maintenance part is the flare part 7 gradually diameter-expanded toward opening, it is between the inner peripheral surface of the multi-hole pipe 1, and the outer peripheral surface of the branch pipes 10 and 10. Any configuration that can form a predetermined gap may be used. Moreover, although the enlarged diameter part 6 of the edge part of the multi-hole pipe 1 is provided in the perimeter direction like FIG. 3, it does not expand in the direction along the partition wall 3, but is perpendicular | vertical with respect to a partition wall. Only the diameter expansion in the direction is acceptable.

１ 多穴管
２ 外管部
３ 仕切壁
４ 連通穴
５ 位置決め用段差部
６ 拡径部
７ フレア部
９ 配管
１０ 分岐管
１１ Ｄ形状遷移部
１２ Ｄ形状部
１３ 曲がり部
１４ ロー材
１５ フィレット（ロー付け部）
２１ 下型
２２ 上型
２３ 支持部材
２４ 芯金
２５ 下金型
２６ 下クランプ
２７ 芯金押え部材
２８ 上金型
２９ 上クランプ
３０ スプリング
３１ パイプ材（成形前の分岐管）
３１ａ 端部
３１ｂ 円筒部
３２ 凹部
３３ ウレタンゴム（弾性体）
４１ 支持部材
４２ 芯金
４３ 下金型
４４ 下クランプ
４５ 上金型
４６ 上クランプ
４７ 回転支点
４８ 凹部
４９ ウレタンゴム（弾性体） DESCRIPTION OF SYMBOLS 1 Multi-hole pipe 2 Outer pipe part 3 Partition wall 4 Communication hole 5 Positioning step part 6 Wide diameter part 7 Flare part 9 Piping 10 Branch pipe 11 D shape transition part 12 D shape part 13 Bending part 14 Raw material 15 Fillet (low Appendices)
21 Lower mold 22 Upper mold 23 Support member 24 Core metal 25 Lower mold 26 Lower clamp 27 Core metal presser member 28 Upper mold 29 Upper clamp 30 Spring 31 Pipe material (branch pipe before molding)
31a End part 31b Cylindrical part 32 Recessed part 33 Urethane rubber (elastic body)
41 Support member 42 Core metal 43 Lower mold 44 Lower clamp 45 Upper mold 46 Upper clamp 47 Rotation fulcrum 48 Recess 49 Urethane rubber (elastic body)

Claims (1)

外管部（２）内が仕切壁（３）によって複数の連通穴（４）、（４）に分割された多穴管（１）の端部の各連通穴（４）、（４）に、複数の分岐管（１０）、（１０）の端部がそれぞれ挿入され、前記多穴管（１）と前記分岐管（１０）、（１０）の間がロー付けで固定される配管（９）の接続構造であって、
前記分岐管（１０）、（１０）の端部に曲がり部（１３）が設けられ、前記曲がり部（１３）は前記仕切壁（３）の先端面（３ａ）より分岐管（１０）、（１０）挿入方向の奥側に配置され、
プレス加工で前記多穴管（１）の開口部に対して前記分岐管（１０）、（１０）のそれぞれの中心をオフセットし、前記多穴管（１）の端部にフレア部（７）を設け、前記仕切壁（３）の端部と前記フレア部（７）との間は離間し、前記仕切壁（３）の端部と前記フレア部（７）との間にはロー材流通スペース（８）が形成されていることを特徴とする配管（９）の接続構造。 The inside of the outer pipe (2) is divided into a plurality of communication holes (4) and (4) divided by a partition wall (3) into the communication holes (4) and (4) at the end of the multi-hole pipe (1). The pipes (9), the ends of the branch pipes (10) and (10) are respectively inserted, and the space between the multi-hole pipe (1) and the branch pipes (10) and (10) is fixed by brazing (9 ) Connection structure,
A bent portion (13) is provided at an end of the branch pipes (10), (10), and the bent portion (13) is branched from the distal end surface (3a) of the partition wall (3). 10) It is arranged on the back side in the insertion direction,
The center of each of the branch pipes (10) and (10) is offset with respect to the opening of the multi-hole pipe (1) by pressing, and a flare portion (7) is formed at the end of the multi-hole pipe (1). Between the end of the partition wall (3) and the flare portion (7), and between the end of the partition wall (3) and the flare portion (7) Connection structure of pipe (9), characterized in that a space (8) is formed.

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