JP5346890B2 - Double pipe joint structure - Google Patents

Double pipe joint structure Download PDF

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JP5346890B2
JP5346890B2 JP2010168306A JP2010168306A JP5346890B2 JP 5346890 B2 JP5346890 B2 JP 5346890B2 JP 2010168306 A JP2010168306 A JP 2010168306A JP 2010168306 A JP2010168306 A JP 2010168306A JP 5346890 B2 JP5346890 B2 JP 5346890B2
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pipe
inner pipe
tube
hole
joint structure
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JP2012026550A (en
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佐藤　　進
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WATANABE, CO. LTD.
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Abstract

<P>PROBLEM TO BE SOLVED: To facilitate connecting the inner pipe of a double tube in which part of outer pipe and inner pipe are made common without deteriorating flowability fluid. <P>SOLUTION: The double pipe 1 in which the inner pipe 12 is arranged in the outer pipe 11 and the outer pipe 11 and the inner pipe 12 are integrally formed by making part of them common is the connected. The hole 16 for connecting is bored in the common part 13 of the outer pipe 11 and the inner pipe 12. The hole 16 is incomplete bored holes having an uncut portion in the part. The cut piece 17 where the hole 16 is formed is obliquely projected into the inside of the inner pipe 12 so as to make an acute angle to the axial line of the hole 16. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

本発明は、外管の内部に内管が配設され外管，内管のそれぞれに液体，気体等の流体が流通される二重管を接続するための二重管の継手構造に係る技術分野に属する。   The present invention relates to a double pipe joint structure for connecting a double pipe in which an inner pipe is disposed inside the outer pipe and a fluid such as liquid or gas is circulated in each of the outer pipe and the inner pipe. Belonging to the field.

最近、流体の流通経路をコンパクト化するために広範な産業分野で二重管が普及され、外管，内管の相対的な配置構造について種々改良が試みられている。これにともなって、二重管を接続するための二重管の継手構造についても種々改良が試みられている。   Recently, double pipes have been widely used in a wide range of industrial fields in order to make the fluid flow path compact, and various improvements have been attempted in the relative arrangement structure of the outer pipe and the inner pipe. Along with this, various improvements have also been attempted in the joint structure of the double pipe for connecting the double pipe.

従来、二重管の継手構造としては、例えば、特許文献１に記載のものが知られている。   Conventionally, as a joint structure of a double pipe, the thing of patent documents 1 is known, for example.

特許文献１には、中心部に内管が配設された外管に接続用の孔を穿孔して外管の軸線と直交する方向に外管用接続管を接続する二重管の継手構造が記載されている。   Patent Document 1 discloses a double pipe joint structure in which a connecting hole is drilled in an outer pipe having an inner pipe disposed in the center, and the outer pipe connecting pipe is connected in a direction perpendicular to the axis of the outer pipe. Have been described.

特許文献１に係る二重管の継手構造は、外管を内管の制約を受けない箇所で外管用接続管に接続することで、内管を閉塞した外管の端口から引出してそのまま接続用フランジに接続することを可能にし、内管の接続を容易化するものである。   The joint structure of the double pipe according to Patent Document 1 is connected to the outer pipe connected to the outer pipe by closing the inner pipe by connecting the outer pipe to the outer pipe connecting pipe at a location not subject to the restriction of the inner pipe. It is possible to connect to the flange and facilitate the connection of the inner pipe.

従来、二重管としては、例えば、特許文献２に記載のものが知られている。   Conventionally, as a double pipe, the thing of patent document 2 is known, for example.

特許文献２には、金属板を曲げ加工して外管，内管が一体的に形成された二重管が記載されている。   Patent Document 2 describes a double tube in which a metal plate is bent and an outer tube and an inner tube are integrally formed.

特許文献２に係る二重管は、外管，内管の一部分が共通化されて製造材料量が削減され、製造コストが安価になるものである。   In the double pipe according to Patent Document 2, a part of the outer pipe and the inner pipe are made common, the amount of manufacturing material is reduced, and the manufacturing cost is reduced.

特開２００１−２３５０８１号公報JP 2001-235081 A 実開昭４８−５７７１５号公報Japanese Utility Model Publication No. 48-57715

特許文献１に係る二重管の継手構造を特許文献２に係る二重管の内管の接続に適用し、特許文献２に係る二重管の外管，内管の共通部分に接続用の孔を穿孔すると端口で内管を閉塞することになるが、穿孔された孔と閉塞された端口との間に無用の空隙が形成されて流体が滞溜したり攪乱されてしまうため、流体の流通性が損なわれてしまうという問題点がある。   The joint structure of the double pipe according to Patent Document 1 is applied to the connection of the inner pipe of the double pipe according to Patent Document 2, and is connected to the common part of the outer pipe and the inner pipe of the double pipe according to Patent Document 2. When the hole is drilled, the inner tube is closed at the end, but a useless gap is formed between the drilled hole and the closed end, and the fluid is trapped or disturbed. There is a problem that the distribution is impaired.

本発明は、このような問題点を考慮してなされたもので、外管，内管の一部分が共通化された二重管の内管を流体の流通性を損なうことなく容易に接続することのできる二重管の継手構造を提供することを課題とする。   The present invention has been made in consideration of such problems, and easily connects the inner pipe of a double pipe in which a part of the outer pipe and the inner pipe are made common without impairing the fluidity of the fluid. It is an object of the present invention to provide a double pipe joint structure that can be used.

前述の課題を解決するため、本発明に係る二重管の継手構造は、特許請求の範囲の各請求項に記載の手段を採用する。   In order to solve the above-described problems, the double pipe joint structure according to the present invention employs means described in each of the claims.

即ち、請求項１では、外管の内部に内管が配設され外管，内管が一部分を共通化されて一体的に形成された二重管を接続するものであって、外管，内管の共通部分に接続用の孔が穿孔され、孔は一部に未切断部分のある不完全な穿孔とされ、孔を形成した切断片は外管，内管の共通部分から内管の内部に突出するように延びていることを特徴とする。   That is, in claim 1, the inner tube is disposed inside the outer tube, and the outer tube is connected to a double tube formed by integrating a part of the inner tube. A hole for connection is drilled in the common part of the inner pipe, and the hole is incomplete with an uncut part in part, and the cut piece forming the hole is connected to the inner pipe from the common part of the outer pipe and the inner pipe. It is characterized by extending so as to protrude inside.

この手段では、特許文献１に係る二重管の継手構造を特許文献２に係る二重管の内管の接続に適用して、内管に接続用の孔を形成した切断片を外管，内管の共通部分から内管の内部に突出させることで、切断片が穿孔された孔と閉塞される端口との間に形成される空隙を塞いで流体の滞溜，攪乱を防止する整流板として機能する。   In this means, the joint structure of the double pipe according to Patent Document 1 is applied to the connection of the inner pipe of the double pipe according to Patent Document 2, and a cut piece having a connection hole formed in the inner pipe is connected to the outer pipe, A rectifying plate that projects from the common part of the inner pipe to the inside of the inner pipe to block the gap formed between the hole in which the cut piece is perforated and the end port to be closed, thereby preventing fluid accumulation and disturbance. Function as.

また、請求項２では、請求項１の二重管の継手構造において、切断片は孔の軸線に対して鋭角となるように内管の流体の流通上流側に傾斜されていることを特徴とする。   According to a second aspect of the present invention, there is provided the double pipe joint structure according to the first aspect, wherein the cut piece is inclined upstream of the fluid flow in the inner pipe so as to have an acute angle with respect to the axis of the hole. To do.

この手段では、切断片が傾斜されることで、内管を流通する流体が円滑に接続用の孔に案内される。   In this means, the fluid flowing through the inner pipe is smoothly guided to the connection hole by the inclined cutting piece.

また、請求項３では、請求項１または２の二重管の継手構造において、内管は外管，内管の共通部分から内管の径方向と平行に相対して延びた側壁をもち側壁の奥端で外管，内管の共通部分に対面する奥壁が側壁の間隔よりも拡開されず断面形状が外側へ凸となる半円形とされ、切断片は外管，内管の共通部分にＵ字形に切断されていることを特徴とする。   According to a third aspect of the present invention, in the double pipe joint structure according to the first or second aspect, the inner pipe has a side wall extending from the common part of the outer pipe and the inner pipe in parallel with the radial direction of the inner pipe. The back wall facing the common part of the outer and inner pipes at the back end is a semi-circular shape with the cross-sectional shape protruding outward rather than expanding the gap between the side walls, and the cut piece is common to the outer and inner pipes The portion is cut into a U-shape.

この手段では、内管が側壁，奥壁でトンネル形に形成されることで、プレス式の穿孔工作で接続用の孔を穿孔した場合に、切断片が側壁で円滑に奥方向へ案内されて内管の各部との衝突が回避され側壁よりも拡開されていない奥壁で無用の間隙が形成されるのが避けられる。   In this means, the inner pipe is formed in a tunnel shape on the side wall and the back wall, so that when the hole for connection is drilled by a press type drilling work, the cut piece is smoothly guided in the back direction on the side wall. Collision with each part of the inner pipe is avoided, and it is possible to avoid the formation of useless gaps in the rear wall that is not expanded more than the side wall.

また、請求項４では、請求項３の二重管の継手構造において、切断片は内管の側壁，奥壁に当接されていることを特徴とする。   According to a fourth aspect of the present invention, in the double pipe joint structure according to the third aspect, the cut piece is in contact with a side wall and a back wall of the inner pipe.

この手段では、切断片が内管の側壁，奥壁に当接されることで、ろう付けを実施することによって切断片で空隙をほぼ完全に塞ぐことができる。   With this means, the gap can be almost completely closed with the cut piece by performing brazing because the cut piece is brought into contact with the side wall and the back wall of the inner tube.

本発明に係る二重管の継手構造は、特許文献１に係る二重管の継手構造を特許文献２に係る二重管の内管の接続に適用して、内管に接続用の孔を形成した切断片を外管，内管の共通部分から内管の内部に突出させることで、切断片が穿孔された孔と閉塞される端口との間に形成される空隙を塞いで流体の滞溜，攪乱を防止する整流板として機能するため、外管，内管の一部分が共通化された二重管の内管を流体の流通性を損なうことなく容易に接続することができる効果がある。   The double pipe joint structure according to the present invention is a double pipe joint structure according to Patent Document 1 applied to the connection of the double pipe inner pipe according to Patent Document 2, and a connection hole is provided in the inner pipe. By protruding the formed cut piece from the common part of the outer and inner pipes into the inner pipe, the gap formed between the hole in which the cut piece is perforated and the end port to be closed is blocked, and the stagnation of the fluid Since it functions as a rectifying plate that prevents accumulation and disturbance, it has the effect of easily connecting the inner pipe of a double pipe with a common part of the outer pipe and inner pipe without impairing the fluidity of the fluid. .

さらに、請求項２として、切断片が傾斜されることで、内管を流通する流体が円滑に接続用の孔に案内されることで、二重管の内管を流体の流通性をより確実に損なうことなく接続することができる効果がある。   Furthermore, as claimed in claim 2, the fluid flowing through the inner pipe is smoothly guided to the connection hole by tilting the cut piece, so that the fluid flow of the inner pipe of the double pipe is more reliably ensured. There is an effect that the connection can be made without any damage.

さらに、請求項３として、内管が側壁，奥壁でトンネル形に形成されることで、プレス式の穿孔工作で接続用の孔を穿孔した場合に、切断片が側壁で円滑に奥方向へ案内されて内管の各部との衝突が回避され側壁よりも拡開されていない奥壁で無用の間隙が形成されるのが避けられるため、プレス式の穿孔工作で切断片を正確に内管の内部に傾斜させて配置することができる効果がある。   Furthermore, as claimed in claim 3, when the inner tube is formed in a tunnel shape at the side wall and the back wall, when the hole for connection is drilled by a press type drilling work, the cut piece is smoothly moved to the back side by the side wall. Because it avoids the formation of useless gaps in the back wall that is guided and avoids collision with each part of the inner pipe and is not expanded more than the side wall, it is possible to accurately cut the cut piece with the press-type drilling machine. There is an effect that it can be inclined and arranged inside.

さらに、請求項４として、切断片が内管の側壁，奥壁に当接されることで、ろう付けを実施することによって切断片で空隙をほぼ完全に塞ぐことができるため、切断片で流体の滞溜，攪乱をより確実に防止することができる効果がある。   Further, as claimed in claim 4, since the cut piece is brought into contact with the side wall and the back wall of the inner tube, the gap can be almost completely closed by the cut piece by performing brazing. This has the effect of more reliably preventing stagnation and disturbance.

本発明に係る二重管の継手構造を実施するための形態の縦断面図である。It is a longitudinal cross-sectional view of the form for implementing the joint structure of the double pipe concerning this invention. 図１のＸ−Ｘ線断面図である。It is the XX sectional view taken on the line of FIG. 図１の要部（二重管）の拡大側面図である。It is an enlarged side view of the principal part (double pipe) of FIG. 図３の製造例を示す斜視図である。It is a perspective view which shows the manufacture example of FIG. 図３の穿孔工作例の斜視図である。FIG. 4 is a perspective view of the drilling work example of FIG. 3. 図５の拡大縦断面図である。FIG. 6 is an enlarged longitudinal sectional view of FIG. 5.

以下、本発明に係る二重管の継手構造を実施するための形態を図面に基づいて説明する。   EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the joint structure of the double pipe which concerns on this invention is demonstrated based on drawing.

この形態では、車載用空調機の冷媒の通路等として使用するに好適な比較的小径に形成される二重管１を接続するものを示してある。   In this embodiment, a structure is shown in which a double pipe 1 formed with a relatively small diameter suitable for use as a refrigerant passage of an in-vehicle air conditioner is connected.

この形態は、図１に示すように、二重管１，内管用接続管２，外管用接続管３，接続用フランジ４の各部で構成されている。   As shown in FIG. 1, this embodiment is composed of each part of a double pipe 1, an inner pipe connection pipe 2, an outer pipe connection pipe 3, and a connection flange 4.

二重管１は、図３に詳細に示されるように、外管１１，内管１２からなる。   As shown in detail in FIG. 3, the double pipe 1 includes an outer pipe 11 and an inner pipe 12.

外管１１，内管１２は、図４に示すように、熱伝導性の良好なアルミニウム系の金属材を押出金型（ダイス）Ｄから直状に押出して一体的に形成され、内管１２が外管１１の内部に配設された格好になってる。車載用空調機の冷媒の通路等として使用する場合、外管１１を流通する流体が冷媒の気化した気体で、内管１２を流通する流体が冷媒の液体である。従って、外管１１が低圧管で内管１２が高圧管となるが、全体の剛性を考慮して外管１１の肉厚ａが内管２の肉厚ｂよりも厚くなるように設定してある（図３参照）。   As shown in FIG. 4, the outer tube 11 and the inner tube 12 are integrally formed by directly extruding an aluminum-based metal material having good thermal conductivity from an extrusion die (die) D, and the inner tube 12. Is arranged inside the outer tube 11. When used as a refrigerant passage or the like of an in-vehicle air conditioner, the fluid flowing through the outer pipe 11 is a gas obtained by vaporizing the refrigerant, and the fluid flowing through the inner pipe 12 is a refrigerant liquid. Accordingly, the outer tube 11 is a low-pressure tube and the inner tube 12 is a high-pressure tube, but the thickness a of the outer tube 11 is set to be larger than the wall thickness b of the inner tube 2 in consideration of the overall rigidity. Yes (see FIG. 3).

二重管１の外管１１は、断面形状が真円形に形成されている。   The outer tube 11 of the double tube 1 is formed in a true circular cross section.

二重管１の内管１２は、図３から明らかなように、断面形状がトンネル形に形成されている。内管１２のトンネル形は、外管１１の円弧形の一部（共通部分１３）を前壁として、共通部分１３から内管１２の径方向と平行に相対して側壁１２１が延び、側壁１２１の奥端で共通部分１３と断面形状が外側（奥方向）へ凸となる半円形として奥壁１２２が対面されることで形成されている。側壁１２１の内側面１２１ａと共通部分１３との界部は、押出加工上必要な最小の曲面である小曲面１４に形成されている。側壁１２１の外側面１２１ｂと外管１１との界部は、曲面１５に形成されている。   As apparent from FIG. 3, the inner tube 12 of the double tube 1 is formed in a tunnel shape in cross section. In the tunnel shape of the inner tube 12, a side wall 121 extends from the common portion 13 in parallel with the radial direction of the inner tube 12 with a part of the arc shape of the outer tube 11 (common portion 13) as a front wall. The back wall 122 is formed by facing the back wall 122 as a semicircular shape in which the cross-sectional shape of the common portion 13 protrudes outward (backward direction) at the back end of 121. A boundary portion between the inner side surface 121a of the side wall 121 and the common portion 13 is formed on a small curved surface 14 which is the minimum curved surface necessary for extrusion processing. A boundary portion between the outer surface 121 b of the side wall 121 and the outer tube 11 is formed on the curved surface 15.

この二重管１に対しては、図５，図６に示すように、外管１１，内管１２の共通部分１３に内管１２の接続のためのプレス式の穿孔工作を行う場合、当然ながら内管１２の側壁１２１の間隔の範囲内の大きさのポンチＰが選択される。そして、ポンチＰの切断刃の形状は、切断平面がＵ字形（図５参照）とされＵ字形の基部Ｐａ側がＵ字形の開放部Ｐｂ側よりも突出するように傾斜（図６参照）されている。なお、ポンチＰのＵ字形の開放部Ｐｂ側の端縁には、切断機能をもった刃が設けられていない。   For the double pipe 1, as shown in FIGS. 5 and 6, when performing a press-type drilling work for connecting the inner pipe 12 to the common portion 13 of the outer pipe 11 and the inner pipe 12, naturally. However, the punch P having a size within the range of the interval between the side walls 121 of the inner pipe 12 is selected. The shape of the cutting blade of the punch P is inclined (see FIG. 6) so that the cutting plane is U-shaped (see FIG. 5) and the U-shaped base Pa side protrudes from the U-shaped open part Pb side. Yes. Note that a blade having a cutting function is not provided at the edge of the punch P on the U-shaped opening portion Pb side.

ポンチＰは、共通部分１３の外側から外管１１，内管１２の径方向へプレス動作され、共通部分１３に接続用の孔１６を穿孔し、穿孔にともなって発生した切断片１７を奥方向（内管１２の奥壁１２２方向）に押込むことになる。なお、ポンチＰは、Ｕ字形の開放部Ｐｂ側が外管１１，内管１２の接続端となる端口１１１，１２３側に位置される。   The punch P is pressed from the outside of the common portion 13 in the radial direction of the outer tube 11 and the inner tube 12, and a hole 16 for connection is drilled in the common portion 13, and a cut piece 17 generated along with the drilling is formed in the back direction. It will be pushed in (in the direction of the inner wall 122 of the inner tube 12). The punch P is positioned on the side of the end ports 111 and 123 where the U-shaped open portion Pb side becomes the connection end of the outer tube 11 and the inner tube 12.

このとき、内管１２の側壁１２１の内側面１２１ａと共通部分１３との界部が小曲面１４に形成されポンチＰの切断の応力が集中しやすくなっているため、共通部分１３が容易に切断され確実に孔１６が形成される。この孔１６は、ポンチＰの切断刃の形状等から、Ｕ字形（舌片形，馬蹄形）となるとともに、Ｕ字形の開放部側が共通部分１３に未切断部分として残置された不完全な穿孔となる。従って、この孔１６の穿孔にともなって、切断片１７がＵ字形の開放部側を支点としてＵ字形の基部側が傾斜するように内管１２に押込まれ内管１２の内部に突出される。即ち、切断片１７は、孔１６の軸線に対して鋭角に配置され、内管１２を流通する流体の流通上流側に傾斜される。   At this time, the boundary portion between the inner surface 121a of the side wall 121 of the inner tube 12 and the common portion 13 is formed on the small curved surface 14, and the stress of cutting the punch P is easily concentrated, so that the common portion 13 is easily cut. Thus, the hole 16 is reliably formed. The hole 16 has a U-shape (tongue piece shape, horseshoe shape) due to the shape of the cutting blade of the punch P, etc., and an incomplete perforation in which the U-shaped open portion side is left as an uncut portion in the common portion 13. Become. Therefore, as the hole 16 is drilled, the cut piece 17 is pushed into the inner tube 12 and protrudes into the inner tube 12 so that the U-shaped base side is inclined with the U-shaped open portion side as a fulcrum. That is, the cut piece 17 is disposed at an acute angle with respect to the axis of the hole 16 and is inclined toward the upstream side of the fluid flowing through the inner tube 12.

また、ポンチＰにより押込まれる切断片１７が両側を内管１２の側壁１２１で内側面１２１ａを滑るように案内されるため、内管１２が切断片１７で損傷を受けたり切断片１７が内管１２に圧接固着されるようなことはない。また、ポンチＰにより押込まれる切断片１７の先端となるＵ字形の基部側が内管１２の側壁１２１よりも拡開されていない奥壁１２２に向かうため、切断片１７と内管１２との間に無用の間隙が形成されなくなる。   Further, since the cut pieces 17 pushed by the punch P are guided on both sides so as to slide on the inner side surface 121a by the side walls 121 of the inner pipe 12, the inner pipe 12 is damaged by the cut pieces 17 or the cut pieces 17 are The pipe 12 is not pressed and fixed. Further, since the U-shaped base side that is the tip of the cut piece 17 pushed by the punch P is directed to the inner wall 122 that is not expanded more than the side wall 121 of the inner pipe 12, the gap between the cut piece 17 and the inner pipe 12 is reached. No useless gaps are formed.

従って、外管１１，内管１２の共通部分１３に内管１２の接続のためのプレス式の穿孔工作を行う際に、切断片１７による不具合が生ずることがない。   Therefore, when the press-type drilling work for connecting the inner tube 12 to the common portion 13 of the outer tube 11 and the inner tube 12 is performed, there is no problem due to the cut piece 17.

なお、内管１２に押込まれた切断片１７は、内管１２の側壁１２１，奥壁１２２に当接される。このため、ろう付けを実施することによって、内管１２に対してほぼ完全な閉塞栓構造とすることができる。   The cut piece 17 pushed into the inner tube 12 is brought into contact with the side wall 121 and the back wall 122 of the inner tube 12. For this reason, it is possible to obtain a substantially complete plugging structure with respect to the inner tube 12 by performing brazing.

穿孔された孔１６には、図１，図２に示すように、内管用接続管２がろう付けで接続される。内管用接続管２は、接続用フランジ４に接続支持される。この接続は、特許文献１に係る二重管の継手構造の技術そのものであって、容易に実施することができる。   As shown in FIGS. 1 and 2, the inner pipe connecting pipe 2 is connected to the drilled hole 16 by brazing. The inner pipe connecting pipe 2 is connected and supported by the connecting flange 4. This connection is the technology itself of the double pipe joint structure according to Patent Document 1, and can be easily implemented.

さらに、内管１２の端口１２３は、押潰加工によって外管１１，共通部分３に円弧状に圧着されろう付けされる。この結果、内管１２の端口１２３と前述した切断片１７との間に空隙１８が形成される。この空隙１８は、ほぼ完全に閉鎖された状態となる。   Furthermore, the end 123 of the inner tube 12 is crimped and brazed to the outer tube 11 and the common portion 3 in an arc shape by crushing. As a result, a gap 18 is formed between the end port 123 of the inner tube 12 and the aforementioned cut piece 17. The gap 18 is almost completely closed.

さらに、外管１１の端口１１１には、外管用接続管３が嵌合されろう付けで接続される。外管用接続管３は、内管用接続管２が接続支持されている接続用フランジ４に共通に接続支持される。   Further, the outer pipe connecting pipe 3 is fitted and connected to the end port 111 of the outer pipe 11 by brazing. The outer pipe connecting pipe 3 is connected and supported in common by the connecting flange 4 to which the inner pipe connecting pipe 2 is connected and supported.

この形態を使用すると、内管１２の奥壁１２２が半円形で耐圧性を備えているため、高圧管としての内管１２の機能が確実に確保される。   If this form is used, since the inner wall 122 of the inner tube 12 is semicircular and has pressure resistance, the function of the inner tube 12 as a high-pressure tube is reliably ensured.

さらに、内管１２が奥壁１２２を２本の足である側壁１２１で支える格好となっているため、捻るように配管を行っっても内管１２が潰れてしまうようなことはない。従って、配管工事に自由度が得られる。   Furthermore, since the inner pipe 12 is configured to support the back wall 122 with the side wall 121 that is two legs, the inner pipe 12 is not crushed even if the pipe is twisted. Therefore, a degree of freedom can be obtained in the piping work.

さらに、内管１２の側壁１２１の外側面１２１ｂと外管１１との界部が曲面１５に形成され狭小間隙Ｓ（図３参照）が形成されない構造であることから、外管１１の内部の流体の流通性が阻害されない。なお、曲面１５は、内管１２の側壁１２１を補強して前述の捻るような配管に対して耐捻性をも発揮する。   Further, since the boundary between the outer surface 121b of the side wall 121 of the inner tube 12 and the outer tube 11 is formed on the curved surface 15 and the narrow gap S (see FIG. 3) is not formed, the fluid inside the outer tube 11 is formed. Is not hindered. Note that the curved surface 15 reinforces the side wall 121 of the inner tube 12 and also exhibits twist resistance against the above-described twisted piping.

さらに、内管１２を流通して内管用接続管２に流入する流体は、切断片１７に案内されて円滑に方向転換がなされる。しかも、切断片１７の背部にある空隙１８がほぼ完全に閉鎖されているため、切断片１７付近で流体が滞溜，攪乱することがない。従って、内管１２，内管用接続管２を流通する流体に高度の流通性が確保される。   Further, the fluid flowing through the inner pipe 12 and flowing into the inner pipe connecting pipe 2 is guided to the cutting piece 17 and smoothly changed direction. Moreover, since the gap 18 at the back of the cut piece 17 is almost completely closed, the fluid does not stagnate or disturb in the vicinity of the cut piece 17. Therefore, high fluidity is ensured for the fluid flowing through the inner pipe 12 and the inner pipe connecting pipe 2.

以上、図示した形態の外に、外管１１，内管１２の高圧管，低圧管を変更することが可能であり、これにともなって肉厚ａ，ｂも適宜変更が可能である。   As described above, it is possible to change the high-pressure pipe and the low-pressure pipe of the outer pipe 11 and the inner pipe 12 in addition to the illustrated form, and accordingly the thicknesses a and b can be changed as appropriate.

さらに、外管１１が非真円形の場合にも適用が可能である。   Furthermore, the present invention can also be applied when the outer tube 11 is non-circular.

さらに、内管１２の奥壁１２２の形状を半円形以外の形状とすることも可能である。   Furthermore, the shape of the inner wall 122 of the inner tube 12 can be a shape other than a semicircular shape.

さらに、切断片１７の傾斜角度については、内管１２の端口１２３側に凹んだ空隙１８を形成して流体の新たな滞溜部を形成しない範囲（孔１６の軸線に対して平行となる角度まで）で設定することが可能である。   Further, the inclination angle of the cut piece 17 is a range in which a void 18 is formed on the end 123 side of the inner tube 12 and a new reservoir portion of fluid is not formed (an angle parallel to the axis of the hole 16). It is possible to set by.

本発明に係る二重管の継手構造を実施するための形態を車載用空調機の冷媒の通路として使用する場合、二重管１については、外管１の外径が１９ｍｍで肉厚ａが１．２ｍｍとされ、内管２の肉厚が１，０ｍｍで側壁２１の内側面２１ａの間隔が５ｍｍで奥壁２２の中心が外管１の中心から４．６１ｍｍ離れた位置に設定される。   When the embodiment for carrying out the double pipe joint structure according to the present invention is used as a refrigerant passage of an in-vehicle air conditioner, the double pipe 1 has an outer diameter of 19 mm and a wall thickness a. The inner tube 2 has a thickness of 1.0 mm, the interval between the inner surfaces 21a of the side walls 21 is 5 mm, and the center of the back wall 22 is set at a position away from the center of the outer tube 1 by 4.61 mm. .

本発明に係る二重管の継手構造は、車載用空調機の冷媒の通路以外の用途にも供することができ、かなり大径に形成される場合に適用が可能である。   The joint structure of a double pipe according to the present invention can be used for applications other than the refrigerant passage of an in-vehicle air conditioner, and can be applied when formed in a considerably large diameter.

１ 二重管
１１ 外管
１２ 内管
１２１ 側壁
１２２ 奥壁
１３ 共通部分
１６ 孔
１７ 切断片
２ 内管用接続管
３ 外管用接続管
４ 接続用フランジ DESCRIPTION OF SYMBOLS 1 Double pipe 11 Outer pipe 12 Inner pipe 121 Side wall 122 Back wall 13 Common part 16 Hole 17 Cutting piece 2 Inner pipe connection pipe 3 Outer pipe connection pipe 4 Connection flange

Claims (4)

外管の内部に内管が配設され外管，内管が一部分を共通化されて一体的に形成された二重管を接続するものであって、外管，内管の共通部分に接続用の孔が穿孔され、孔は一部に未切断部分のある不完全な穿孔とされ、孔を形成した切断片は外管，内管の共通部分から内管の内部に突出するように延びていることを特徴とする二重管の継手構造。   An inner tube is arranged inside the outer tube, and the outer tube and the inner tube are connected to a common part of the outer tube and the inner tube, and a part of the inner tube is integrally formed. A hole is drilled, and the hole is incomplete with a part that is not cut, and the cut piece that forms the hole extends from the common part of the outer and inner pipes so as to protrude into the inner pipe. A double pipe joint structure characterized by 請求項１の二重管の継手構造において、切断片は孔の軸線に対して鋭角となるように内管の流体の流通上流側に傾斜されていることを特徴とする二重管の継手構造。   2. The double pipe joint structure according to claim 1, wherein the cut piece is inclined to the upstream side of the flow of the fluid in the inner pipe so as to have an acute angle with respect to the axis of the hole. . 請求項１または２の二重管の継手構造において、内管は外管，内管の共通部分から内管の径方向と平行に相対して延びた側壁をもち側壁の奥端で外管，内管の共通部分に対面する奥壁が側壁の間隔よりも拡開されず断面形状が外側へ凸となる半円形とされ、切断片は外管，内管の共通部分にＵ字形に切断されていることを特徴とする二重管の継手構造。   3. The double pipe joint structure according to claim 1, wherein the inner pipe is an outer pipe, a side wall extending from a common portion of the inner pipe in parallel with the radial direction of the inner pipe, and an outer pipe at the back end of the side wall. The inner wall facing the common part of the inner pipe is not expanded beyond the interval between the side walls, and the cross-sectional shape is a semicircular shape protruding outward, and the cut piece is cut into a U-shape at the common part of the outer pipe and the inner pipe A double pipe joint structure characterized by 請求項３の二重管の継手構造において、切断片は内管の側壁，奥壁に当接されていることを特徴とする二重管の継手構造。   4. The double pipe joint structure according to claim 3, wherein the cut piece is in contact with a side wall and a back wall of the inner pipe.
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