JP2013145004A - Branch structure of two-layer pipe - Google Patents

Branch structure of two-layer pipe Download PDF

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JP2013145004A
JP2013145004A JP2012005080A JP2012005080A JP2013145004A JP 2013145004 A JP2013145004 A JP 2013145004A JP 2012005080 A JP2012005080 A JP 2012005080A JP 2012005080 A JP2012005080 A JP 2012005080A JP 2013145004 A JP2013145004 A JP 2013145004A
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layer pipe
layer
pipe
double
sealing material
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JP6108663B2 (en
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Susumu Sato
佐藤　　進
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Waki Seisakusho KK
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Waki Seisakusho KK
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Abstract

PROBLEM TO BE SOLVED: To sufficiently facilitate a production and bending processing of a branched pipe which becomes to be a connection end, in relation to a branch structure for piping two layer pipes where two flow paths of a fluid are parallelly disposed and united.SOLUTION: At an end of a two-layer pipe body 1 where two flow paths 12 of a fluid are parallelly disposed and united, two branching pipes 3 which become connection ends are disposed. Two branching pipes 3, as separate members, are each inserted to an expansion part 13 expanding the end opening of the two-layer pipe body 1 by interposing a seal member 2 having elasticity. By caulking the expansion part 13 of the two-layer pipe body 1, the branching pipes 3 are fixed to the two-layer pipe body 1.

Description

本発明は、流体の２つの流通路が並設一体化された二層管（多孔管）の配管のための分岐構造に係る技術分野に属する。   The present invention belongs to a technical field related to a branch structure for piping of a two-layer pipe (perforated pipe) in which two flow paths of fluid are integrated in parallel.

最近、自動車に設備される暖房装置の暖房性能を高めるために、フロント側にあるエンジンから離れた箇所に車室の後方側を積極的に暖房するリアヒータコアを設置することが行われている。リアヒータコアの設置では、エンジンとリアヒータコアとを接続する流体（エンジン冷却水）の２つの流通路（往路，復路）をスペース的に制約のある車室床付近の空間に長く配管しなければならなくなることから、２つの流通路が並設一体化された二層管が採用されている。二層管については、エンジン，リアヒータ付近においてインレットポート，アウトレットポートへの接続のために両流通路を分岐する必要性がある。このため、接続端末が分岐された二層管を容易に製造することのできる技術の開発が要望されている。   Recently, in order to enhance the heating performance of a heating device installed in an automobile, a rear heater core that actively heats the rear side of the passenger compartment is installed at a location away from the engine on the front side. In the installation of the rear heater core, the two flow paths (outward and return paths) of the fluid (engine cooling water) connecting the engine and the rear heater core must be piped long in a space near the vehicle floor where space is limited. Therefore, a two-layer pipe in which two flow paths are integrated in parallel is adopted. For double-layer pipes, there is a need to branch both flow paths for connection to the inlet port and outlet port in the vicinity of the engine and the rear heater. For this reason, development of the technique which can manufacture easily the two-layer pipe | tube with which the connection terminal was branched is desired.

従来、接続端末が分岐された二層管を容易に製造することを指向した技術としては、例えば、特許文献１に記載のものが知られている。   2. Description of the Related Art Conventionally, for example, a technique described in Patent Document 1 is known as a technique aimed at easily manufacturing a two-layer pipe having a connection terminal branched.

特許文献１には、２本の管体が長手方向に沿って一部分が接合される接合部によって一体化された断面形状が８字形の素管を用い、接続端末となる部分の接合部を切断加工することによって両管体を分離させた分岐管に分岐するとともに、接続端末以外の部分の両管体をしごき加工して両管体が半円形で一体化され中央の直径方向に仕切壁を有する断面形状が円形の二層管本体を形成する二層管の分岐構造が記載されている。   Patent Document 1 uses a raw tube having an 8-shaped cross section in which two pipe bodies are integrated by a joint part of which is joined along the longitudinal direction, and cuts the joint at a portion that becomes a connection terminal. Both pipes are branched into branch pipes that are separated by processing, and both pipes other than the connection terminal are ironed to form both pipes in a semicircular shape, and a partition wall is formed in the central diametrical direction. A bifurcated structure of a two-layer tube forming a two-layer tube body having a circular cross-sectional shape is described.

特許文献１に係る二層管の分岐構造は、素管に簡便な２種類の加工（切断加工，しごき加工）を施すことによって接続端末が分岐された二層管を製造することができるようにして、二層管を製造を容易化するものである。   The bifurcated structure of the two-layer pipe according to Patent Document 1 enables the production of a two-layer pipe in which the connection terminal is branched by performing two types of simple processing (cutting and ironing) on the raw pipe. Thus, the manufacture of the two-layer tube is facilitated.

特開２００７−１０１９９号公報JP 2007-10199 A

特許文献１に係る二層管の分岐構造では、分岐管を素管の切断加工によって分岐することから、分岐管の切断痕についての表面処理を行わないと配管に支障が生じてしまうため、二層管の製造が充分に容易化されているとはいえないという問題点がある。また、分岐管をエンジン，リアヒータ付近においてインレットポート，アウトレットポートへの接続のために複雑に曲げ加工する場合に、長尺の二層管本体とともに加工機にセットしなければならないため、分岐管の曲げ加工が面倒になるという問題点がある。   In the bifurcated structure of the two-layer pipe according to Patent Document 1, since the branch pipe is branched by the cutting process of the raw pipe, if the surface treatment for the cut trace of the branch pipe is not performed, the piping will be hindered. There is a problem that the production of the laminar tube is not sufficiently facilitated. In addition, when the branch pipe is bent flexibly for connection to the inlet port and outlet port in the vicinity of the engine and rear heater, it must be set in the processing machine together with the long two-layer pipe body. There is a problem that bending is troublesome.

本発明は、このような問題点を考慮してなされたもので、製造が充分に容易化され接続端末となる分岐管の曲げ加工が容易になる二層管の分岐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 it is an object of the present invention to provide a bilayer pipe branching structure that is sufficiently easy to manufacture and that facilitates bending of the branch pipe that becomes the connection terminal. And

前述の課題を解決するため、本発明に係る二層管の分岐構造は、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 two-layer pipe branching structure according to the present invention employs means described in each of the claims.

即ち、請求項１では、流体の２つの流通路が並設一体化された二層管本体の端部に接続端末となる２本の分岐管が設けられた二層管の分岐構造において、二層管本体の端口が拡開された拡開部に弾性を有するシール材を介して２本の別部材の分岐管がそれぞれ挿入され、二層管本体の拡開部がカシメられることによって分岐管が二層管本体に固定されていることを特徴とする。   That is, according to the first aspect of the present invention, there is provided a two-layer pipe branching structure in which two branch pipes serving as connection terminals are provided at the end of a two-layer pipe body in which two fluid flow paths are arranged side by side. A branch pipe is formed by inserting two separate branch pipes through a sealing material having elasticity into the widened portion where the end of the layer pipe main body is widened, and caulking the widened portion of the double-layer pipe main body. Is fixed to the double-layer tube body.

この手段では、二層管本体に別部材の２本の分岐管を固定することから、分岐管の配管に向けた表面処理等を行う必要がなく、短尺の状態で既に曲げ加工された分岐管を使用することができる。また、シール材，カシメによる固定手段で二層管本体と分岐管とが接続され、コスト高となるろう付けが避けられている。   In this means, two branch pipes, which are separate members, are fixed to the two-layer pipe body, so there is no need to perform surface treatment or the like on the pipe of the branch pipe, and the branch pipe that has already been bent in a short state. Can be used. Further, the two-layer pipe main body and the branch pipe are connected by a fixing means using a sealing material and caulking, and brazing, which increases costs, is avoided.

また、請求項２では、請求項１の二層管の分岐構造において、二層管本体は中央の直径方向に仕切壁を有する断面形状が円形に形成され、二層管本体に設けられた拡開部は仕切壁に直交する方向へ拡開されていることを特徴とする。   Further, according to claim 2, in the branch structure of the two-layer tube according to claim 1, the double-layer tube main body is formed in a circular cross-sectional shape having a partition wall in the central diametrical direction, and is provided on the double-layer tube main body. The opening is widened in a direction perpendicular to the partition wall.

この手段では、仕切壁を有する断面形状が円形の二層管本体を仕切壁に直交する方向へ拡開させて拡開部が形成されることで、流体の２つの流通路の不規則的な拡開変形が防止される。   In this means, the two-layer pipe body having a circular cross-sectional shape having a partition wall is expanded in a direction perpendicular to the partition wall to form an expanded portion, whereby the irregular flow paths of the two fluid flow paths are formed. Spreading deformation is prevented.

また、請求項３では、請求項２の二層管の分岐構造において、シール材は中央部に分岐管が挿通される挿通孔を有して二層管本体の拡開部に嵌合されるブロック体に形成され、分岐管は先端部と先端部から軸方向に少し離された箇所とに挿通したシール材を保持するビードが設けられていることを特徴とする。   According to a third aspect of the present invention, in the bifurcated structure of the two-layer pipe according to the second aspect, the sealing material has an insertion hole through which the branch pipe is inserted in the center portion and is fitted into the expanded portion of the two-layer pipe body. The branch pipe is provided with a bead for holding a sealing material inserted into a tip portion and a portion slightly separated from the tip portion in the axial direction.

この手段では、ブロック体のシール材が挿通された分岐管のビードによって保持されて二層管本体の拡開部に嵌合される。   In this means, the sealing material of the block body is held by the bead of the branch pipe through which the block body is inserted, and is fitted to the expanded portion of the double-layer pipe body.

また、請求項４では、請求項３の二層管の分岐構造において、二層管本体は拡開部の仕切壁の一部が端口から内部側に向けて切除され、シール材は二層管本体の拡開部の仕切壁の切除端に係合する係合溝が設けられていることを特徴とする。 According to a fourth aspect of the present invention, in the bifurcated structure of the two-layer pipe according to the third aspect, the double-layer pipe main body is partly cut away from the end opening toward the inner side, and the sealing material is the double-layer pipe. An engagement groove that engages with the cut end of the partition wall of the expansion portion of the main body is provided.

この手段では、二層管本体の仕切壁の切除端とシール材の係合溝とが嵌合によって係合される。   In this means, the cut end of the partition wall of the double-layer tube body and the engagement groove of the seal material are engaged by fitting.

また、請求項５では、請求項３または４の二層管の分岐構造において、シール材は外側面の二層管本体の拡開部の仕切壁の隅部に対面する部分に外側へ突出した膨出部が設けられていることを特徴とする。   Further, according to claim 5, in the bilayer pipe branching structure according to claim 3 or 4, the sealing material protrudes outward in a portion facing the corner of the partition wall of the expanded portion of the double-layer pipe body on the outer surface. A bulging portion is provided.

この手段では、シール材の外側面のカシメの応力が作用しにくい二層管本体の拡開部の仕切壁の隅部に対面する部分に膨出部が設けられることで、二層管本体の拡開部のカシメ後のシール性が全体的に均等に確保される。   In this means, the bulging portion is provided at the portion facing the corner of the partition wall of the expanded portion of the double-layer tube body where the caulking stress on the outer surface of the sealing material is difficult to act, so that the double-layer tube body The sealability after crimping of the expanded portion is ensured uniformly throughout.

また、請求項６では、請求項３または４の二層管の分岐構造において、シール材は挿通孔の内周面の二層管本体の拡開部の仕切壁の隅部に対面する部分に内側へ突出した膨出部が設けられていることを特徴とする。   Further, in claim 6, in the bifurcated structure of the two-layer pipe according to claim 3 or 4, the sealing material is provided at a portion facing the corner of the partition wall of the expanded portion of the two-layer pipe body on the inner peripheral surface of the insertion hole. A bulging portion protruding inward is provided.

この手段では、シール材の挿通孔の内周面のカシメの応力が作用しにくい二層管本体の拡開部の仕切壁の隅部に対面する部分に膨出部が設けられることで、二層管本体の拡開部のカシメ後のシール性が全体的に均等に確保される。   In this means, the bulging portion is provided at the portion facing the corner portion of the partition wall of the expanded portion of the double-layered tube main body where the stress of caulking on the inner peripheral surface of the insertion hole of the sealing material is difficult to act. The sealing performance after caulking of the expanded portion of the layered tube main body is ensured as a whole.

本発明に係る二層管の分岐構造は、二層管本体に別部材の２本の分岐管を固定することから、分岐管の配管に向けた表面処理等を行う必要がなく、短尺の状態で既に曲げ加工された分岐管を使用することができるため、製造が充分に容易化され接続端末となる分岐管の曲げ加工が容易になる効果がある。また、シール材，カシメによる固定手段で二層管本体と分岐管とが接続され、コスト高となるろう付けが避けられているため、製造コストが安価になる効果がある。   Since the bifurcated structure of the two-layer pipe according to the present invention fixes two branch pipes as separate members to the two-layer pipe main body, there is no need to perform surface treatment or the like for the pipe of the branch pipe, and the short state Since the branch pipe that has already been bent can be used, the manufacturing can be facilitated sufficiently, and the branch pipe serving as the connection terminal can be easily bent. Further, since the two-layer pipe main body and the branch pipe are connected by a fixing means using a sealing material and caulking, and the brazing that increases the cost is avoided, the manufacturing cost can be reduced.

さらに、請求項２として、仕切壁を有する断面形状が円形の二層管本体を仕切壁に直交する方向へ拡開させて拡開部が形成されることで、流体の２つの流通路の不規則的な拡開変形が防止されるため、二層管本体の拡開部によって流体の流通性が損なわれることがない効果がある。   Furthermore, as claimed in claim 2, the two-layer pipe body having a circular sectional shape having a partition wall is expanded in a direction orthogonal to the partition wall to form an expanded portion, thereby preventing the two flow paths of the fluid. Since regular expansion deformation is prevented, there is an effect that the fluidity of the fluid is not impaired by the expansion portion of the double-layer tube body.

さらに、請求項３として、ブロック体のシール材が挿通された分岐管のビードによって保持されて二層管本体の拡開部に嵌合されるため、組立工作が容易となるとともにカシメによるシール材の無用の膨出や不測の離脱が防止される効果がある。   Further, as claimed in claim 3, since the sealing material of the block body is held by the bead of the branch pipe through which the block body is inserted and fitted into the expanded portion of the double-layer pipe body, the assembly work is facilitated and the sealing material by caulking This has the effect of preventing unnecessary bulges and unexpected detachment.

さらに、請求項４として、二層管本体の仕切壁の切除端とシール材の係合溝とが嵌合によって係合されるため、カシメの際のシール材の無用の位置ずれを防止することができる効果がある。   Furthermore, as claimed in claim 4, since the cut end of the partition wall of the double-layer tube main body and the engaging groove of the sealing material are engaged by fitting, it is possible to prevent unnecessary displacement of the sealing material during caulking. There is an effect that can.

さらに、請求項５として、シール材の外側面のカシメの応力が作用しにくい二層管本体の拡開部の仕切壁の隅部に対面する部分に膨出部が設けられることで、二層管本体の拡開部のカシメ後のシール性が全体的に均等に確保されるため、高度のシール性が得られる効果がある。   Furthermore, as claimed in claim 5, a bulging portion is provided at a portion facing the corner of the partition wall of the expanded portion of the double-layered tube main body where the caulking stress on the outer surface of the sealing material is less likely to act. Since the sealing performance after crimping of the expanded portion of the pipe body is ensured as a whole, there is an effect that a high sealing performance can be obtained.

さらに、請求項６として、シール材の挿通孔の内周面のカシメの応力が作用しにくい二層管本体の拡開部の仕切壁の隅部に対面する部分に膨出部が設けられることで、二層管本体の拡開部のカシメ後のシール性が全体的に均等に確保されるため、高度のシール性が得られる効果がある。   Further, as claimed in claim 6, a bulging portion is provided at a portion facing the corner portion of the partition wall of the expanded portion of the double-layered tube main body where the caulking stress of the inner peripheral surface of the insertion hole of the sealing material is difficult to act. And since the sealing performance after crimping of the expansion part of a double-layered pipe main body is ensured uniformly as a whole, there exists an effect of obtaining a high degree of sealing performance.

本発明に係る二層管の分岐構造を実施するための形態の第１例の斜視図であり、（Ａ）に組立状態が示され、（Ｂ）に分解状態が示されている。It is a perspective view of the 1st example of the form for carrying out the branched structure of the two-layer pipe concerning the present invention, (A) shows an assembly state and (B) shows an exploded state. 図１（Ａ）の要部の拡大され横断面図である。FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 図１の要部の製造例を示す斜視図である。It is a perspective view which shows the manufacture example of the principal part of FIG. 図３の製造の一工程の横断面図である。FIG. 4 is a transverse cross-sectional view of one process of manufacturing in FIG. 3. 図１の他の要部の製造例を示す斜視図である。It is a perspective view which shows the manufacture example of the other principal part of FIG. 図５のの製造工程を示すものであり、（Ａ），（Ｂ）に工程順が示されている。FIG. 6 shows the manufacturing process of FIG. 5, and the order of the processes is shown in (A) and (B). 図１のさらに他の要部の拡大された正面図である。FIG. 5 is an enlarged front view of still another main part of FIG. 1. 本発明に係る二層管の分岐構造を実施するための形態の第２例の要部の拡大された正面図である。It is the front view to which the principal part of the 2nd example of the form for implementing the branch structure of the two-layer pipe concerning this invention was expanded. 本発明に係る二層管の分岐構造を実施するための形態の第３例の要部の分解状態の斜視図である。It is a perspective view of the decomposition | disassembly state of the principal part of the 3rd example of the form for implementing the branch structure of the two-layer pipe concerning this invention. 図９の組立状態の拡大され横断面図である。FIG. 10 is an enlarged cross-sectional view of the assembled state of FIG. 9.

以下、本発明に係る二層管の分岐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 branch structure of the two-layer pipe concerning this invention is demonstrated based on drawing.

図１〜図７は、本発明に係る二層管の分岐構造を実施するための形態の第１例を示すものである。   FIGS. 1-7 shows the 1st example of the form for implementing the branch structure of the two-layer pipe concerning this invention.

第１例では、自動車に設備される暖房装置としてエンジンとリアヒータコアとを接続するに好適なものを示してある。   In the first example, a heating device installed in an automobile is suitable for connecting an engine and a rear heater core.

第１例は、図１に示すように、二層管本体１，シール材２，分岐管３で構成されている。   As shown in FIG. 1, the first example includes a two-layer tube main body 1, a seal material 2, and a branch tube 3.

二層管本体１は、図３からも明らかなように、中央の直径方向に仕切壁１１を有する断面形状が円形に形成され、断面形状が半円形の流体の２つの流通路１２が並設一体化されている。この二層管本体１については、押出し成形によって断面形状を円形に形成することもできるし、押出し成形によって断面形状が８字に形成されたものをしごき加工によって最終的に断面形状を円形に形成することもできる（特許文献１参照）。二層管本体１の端口には、仕切壁１１と直交する方向に拡開されて断面形状が楕円形に近似した形状の拡開部１３が設けられている。この拡開部１３の形状は、仕切壁１１の変形を防止して流通路１２の不規則的な拡開変形を防止し、拡開部１３の形成によって流体の流通性が損なわれるのを避けることができる。   As is clear from FIG. 3, the double-layer tube body 1 has a circular sectional shape having a partition wall 11 in the central diametrical direction, and two flow passages 12 for fluid having a semicircular sectional shape are arranged side by side. It is integrated. About this double-layered tube body 1, the cross-sectional shape can be formed into a circle by extrusion molding, or the cross-sectional shape formed into eight characters by extrusion molding is finally formed into a circular shape by ironing It can also be performed (see Patent Document 1). At the end opening of the double-layered tube main body 1, an expanded portion 13 having a shape that is expanded in a direction orthogonal to the partition wall 11 and whose cross-sectional shape approximates an ellipse is provided. The shape of the expanded portion 13 prevents the partition wall 11 from being deformed and prevents the flow passage 12 from being irregularly expanded, and prevents the fluid flowability from being impaired by the formation of the expanded portion 13. be able to.

二層管本体１の拡開部１３の形成については、図３，図４に示す製造例を採ることができる。   About the formation of the expansion part 13 of the double-layered tube main body 1, the manufacture example shown in FIG. 3, FIG. 4 can be taken.

即ち、金型を兼用した２つ割のクランプ１０と１対のポンチ２０とが使用される。クランプ１０は、後端部に二層管本体１が挿通される挿通孔１０ａが設けられ、先端部に挿通孔１０ａと連通して二層管本体１の拡開部１３の外形状に対応した拡開溝１０ｂが設けられている。ポンチ２０は、先端部に二層管本体１の流通路１２にそれぞれ侵入するテーパ形の侵入部２０ａが設けられ、後端部に浸入部２０ａと連続して二層管本体１拡開部１３（拡開された流通路１２）の内形状に対応した本体部２０ｂが設けられている。このクランプ１０には、挿通孔１０ａに挿通された二層管本体１が拡開溝１０ｂまで突出されて保持される。クランプ１０に保持された二層管本体１に対しては、端口からポンチ２０の浸入部２０ａを続いて本体部２０ｂを侵入させる。この結果、クランプ１０とポンチ２０とのプレスによって、二層管本体１の端口に拡開部１３が形成される。   That is, the split clamp 10 and the pair of punches 20 that also serve as a mold are used. The clamp 10 is provided with an insertion hole 10a through which the double-layer tube main body 1 is inserted at the rear end portion, and communicates with the insertion hole 10a at the tip portion to correspond to the outer shape of the expanded portion 13 of the double-layer tube main body 1. An expansion groove 10b is provided. The punch 20 is provided with a tapered intrusion portion 20a that penetrates the flow passage 12 of the double-layer tube main body 1 at the front end portion, and the double-layer tube main body 1 expanding portion 13 is continuous with the intrusion portion 20a at the rear end portion. A main body 20b corresponding to the inner shape of the expanded flow passage 12 is provided. The clamp 10 holds the double-layer tube main body 1 inserted through the insertion hole 10a so as to protrude to the expansion groove 10b. With respect to the double-layer tube main body 1 held by the clamp 10, the main body portion 20b is caused to enter from the end port through the intrusion portion 20a of the punch 20. As a result, the expanded portion 13 is formed at the end of the double-layer tube body 1 by pressing the clamp 10 and the punch 20.

シール材２は、ゴム材等の弾性を有する素材によって成形されたブロック体からなる。このシール材２は、中央部に分岐管３が挿通される挿通孔２１を有して二層管本体１の拡開部１３の流通路１２のそれぞれ圧入され嵌合される断面形状がＤ字に近似した形状に成形され、外側面のＤ字形の角部となる二層管本体１の拡開部１３の仕切壁１１の隅部に対面する部分に外側へ円弧形に突出した膨出部２２が設けられている。図７には、シール材２の詳細が示されており、二層管本体１の拡開部１３の流通路１２への圧入が考慮されて、外形寸法が二点鎖線で示される二層管本体１の拡開部１３の流通路１２のよりも大きく形成され、さらに外形寸法の一部が膨出部２２によって部分的に大きくなっている。   The sealing material 2 is made of a block body formed of an elastic material such as a rubber material. This sealing material 2 has an insertion hole 21 through which the branch pipe 3 is inserted at the center, and the cross-sectional shape into which each of the flow passages 12 of the expanded portion 13 of the double-layer pipe body 1 is press-fitted and fitted is D-shaped. Bulging projecting outwardly in a circular arc shape at a portion facing the corner of the partition wall 11 of the expanded portion 13 of the double-layer tube body 1 that is formed into a shape that approximates to the D-shaped corner of the outer surface A portion 22 is provided. FIG. 7 shows details of the sealing material 2 and a double-layer pipe whose outer dimensions are indicated by a two-dot chain line in consideration of press-fitting into the flow passage 12 of the expanded portion 13 of the double-layer pipe body 1. The enlarged portion 13 of the main body 1 is formed larger than the flow passage 12, and a part of the outer dimension is partially enlarged by the bulging portion 22.

分岐管３は、通常の丸管からなる。この分岐管３は、先端部と先端部から軸方向に少し離された箇所とに挿通したシール材２を保持する環状のビード３１，３２が設けられている。   The branch pipe 3 is a normal round pipe. The branch pipe 3 is provided with annular beads 31 and 32 for holding the sealing material 2 inserted through the tip portion and a portion slightly separated from the tip portion in the axial direction.

分岐管３のビード３１，３２の形成については、図５，図６に示す製造例を採ることができる。   For the formation of the beads 31 and 32 of the branch pipe 3, the manufacturing examples shown in FIGS.

即ち、金型を兼用した２つ割のクランプ３０とポンチ４０とが使用される。クランプ３０は、本体部３０ａの先端部に設けられた可動用溝３０ｂに可動用溝３０ｂよりも軸長の短い可動部３０ｃがスライド可能に設けられ、本体部３０ａと可動部３０ｃとに分岐管３が挿通される挿通孔３０ｄ，３０ｅが設けられている。ポンチ４０は、先端部に分岐管３の内部に侵入する円柱形の侵入部４０ａが設けられ、侵入部４０ａの基部の周囲に分岐管３の先端部側のビード３１を形成する金型となるビード成形溝４０ｂが設けられている。このクランプ３０には、図６（Ａ）に示すように、可動部３０ｃが先端部側にスライドされた状態で挿通孔３０ｄ，３０ｅに挿通された分岐管３が可動部３０ｃの先端部からわずかに突出されて保持される。クランプ３０に保持された分岐管３に対しては、端口からポンチ４０の浸入部４０ａを侵入させる。この結果、クランプ３０とポンチ４０とのプレスによって、図６（Ｂ）に示すように、クランプ３０の可動部３０ｃのスライドによる後退で分岐管３の後端部側にビード３２が形成され、クランプ３０の可動部３０ｃの端面とポンチ４０のビード成形溝４０ｂとの接合によって分岐管３の先端部側にビード３１が形成される。   That is, the split clamp 30 and the punch 40 that also serve as a mold are used. The clamp 30 is provided with a movable portion 30c having a shorter axial length than the movable groove 30b in a movable groove 30b provided at the distal end portion of the main body portion 30a so as to be slidable, and is branched into the main body portion 30a and the movable portion 30c. Insertion holes 30d and 30e through which 3 is inserted are provided. The punch 40 is provided with a cylindrical intrusion portion 40a that enters the inside of the branch pipe 3 at the tip portion, and becomes a mold that forms the bead 31 on the tip portion side of the branch tube 3 around the base portion of the intrusion portion 40a. A bead forming groove 40b is provided. As shown in FIG. 6A, the clamp 30 has a branch pipe 3 inserted through the insertion holes 30d and 30e in a state where the movable portion 30c is slid to the distal end side, slightly from the distal end portion of the movable portion 30c. Is projected and held. For the branch pipe 3 held by the clamp 30, the intrusion portion 40a of the punch 40 enters from the end port. As a result, by pressing the clamp 30 and the punch 40, as shown in FIG. 6B, the bead 32 is formed on the rear end side of the branch pipe 3 by retreating the movable portion 30c of the clamp 30 by sliding. The bead 31 is formed on the distal end side of the branch pipe 3 by joining the end face of the movable portion 30c of the 30 and the bead forming groove 40b of the punch 40.

前述の二層管本体１，シール材２，分岐管３については、二層管本体１の拡開部１３に対してシール材２をビード３１，３２の間に挿通保持した分岐管３を挿入することで組立てられる。そして、二層管本体１の拡開部１３を外側からカシメすることで、二層管本体１の拡開部１３に分岐管３を固定する。   For the above-described two-layer pipe main body 1, sealing material 2, and branch pipe 3, the branch pipe 3 in which the sealing material 2 is inserted and held between the beads 31 and 32 is inserted into the expanded portion 13 of the two-layer pipe main body 1. It is assembled by doing. And the branch pipe 3 is fixed to the expansion part 13 of the double-layer pipe body 1 by crimping the expansion part 13 of the double-layer pipe body 1 from the outside.

第１例によると、二層管本体１に別部材の２本の分岐管３を固定することになる。従って、分岐管３の配管に向けた表面処理等を行う必要がなくなって、二層管の製造が充分に容易化されることになる。また、短尺の状態で既に曲げ加工された分岐管３を使用することができるため、接続端末となる分岐管３の曲げ加工が容易になる。また、シール材２，カシメによる固定手段で二層管本体１と分岐管３とが接続され、コスト高となるろう付けが避けられているため、製造コストが安価になる。   According to the first example, two branch pipes 3 as separate members are fixed to the double-layer pipe body 1. Therefore, it is not necessary to perform surface treatment or the like for the pipe of the branch pipe 3, and the production of the two-layer pipe is sufficiently facilitated. Moreover, since the branch pipe 3 already bent in a short state can be used, the bending of the branch pipe 3 serving as a connection terminal is facilitated. Further, since the two-layer pipe body 1 and the branch pipe 3 are connected by the fixing means using the sealing material 2 and the caulking, and the brazing which increases the cost is avoided, the manufacturing cost is reduced.

第１例が組立てられた状態では、弾性を有するシール材２が二層管本体１の拡開部１３と分岐管３とに圧接されて良好なシール性が得られる。従って、二層管本体１の流通路１２や分岐管３を流通る流体の漏出が完全に阻止される。また、シール材２が分岐管３の２つのビード３１，３２によって定位置に保持されているため、前述の組立工作が容易となるとともに、シール材２の不測の離脱が防止される。なお、分岐管３の後端部側のビード３２は、シール材２の二層管本体１の拡開部１３からの無用の膨出を防止して、他部材等の接触によるシール材２の劣化を防止するのにも役立つ。   In the state where the first example is assembled, the sealing material 2 having elasticity is brought into pressure contact with the expanded portion 13 and the branch pipe 3 of the two-layer pipe main body 1 to obtain a good sealing property. Therefore, leakage of the fluid flowing through the flow passage 12 and the branch pipe 3 of the double-layer pipe body 1 is completely prevented. Further, since the sealing material 2 is held in place by the two beads 31 and 32 of the branch pipe 3, the above-described assembly work is facilitated and the unexpected separation of the sealing material 2 is prevented. The bead 32 on the rear end side of the branch pipe 3 prevents unnecessary swelling of the sealing material 2 from the expanded portion 13 of the two-layer pipe main body 1, and prevents the sealing material 2 from coming into contact with other members. It also helps prevent deterioration.

さらに、第１例では、二層管本体１の拡開部１３が仕切壁１１と直交する方向に拡開されることによって、仕切壁１１の隅部がカシメの応力の作用しにくい部分となる。然しながら、二層管本体１の仕切壁１１の隅部に対面する位置にシール材２の膨出部２２が当接され、シール材２が強く二層管本体１の仕切壁１１の隅部に圧接されることになるため、二層管本体１の拡開部１３のカシメ後のシール性が全体的に均等に確保されて高度のシール性が得られる。   Furthermore, in the first example, the expanded portion 13 of the double-layer tube body 1 is expanded in a direction orthogonal to the partition wall 11, so that the corner of the partition wall 11 becomes a portion where the caulking stress does not easily act. . However, the bulging part 22 of the sealing material 2 is brought into contact with the corner of the partition wall 11 of the double-layer pipe body 1 so that the sealing material 2 is strongly attached to the corner of the partition wall 11 of the double-layer pipe body 1. Since it is press-contacted, the sealing performance after crimping of the expansion part 13 of the double-layered tube main body 1 is ensured uniformly as a whole, and a high sealing performance is obtained.

図８は、本発明に係る二層管の分岐構造を実施するための形態の第２例を示すものである。   FIG. 8 shows a second example of a mode for carrying out a bilayer pipe branching structure according to the present invention.

第２例は、第１例におけるシール材２の膨出部２２を挿通孔２１の内周面に設けている。即ち、シール材２の膨出部２２を挿通孔２１の内周面の一部が弦となるように膨出部２２を形成している。   In the second example, the bulging portion 22 of the sealing material 2 in the first example is provided on the inner peripheral surface of the insertion hole 21. That is, the bulging portion 22 of the sealing material 2 is formed so that a part of the inner peripheral surface of the insertion hole 21 becomes a string.

第２例によると、シール材２の膨出部２２が第１例と同様の作用効果を奏することに加えて、第１例よりもシール材２の膨出部２２を容易に形成することが可能になる。   According to the second example, in addition to the bulging portion 22 of the sealing material 2 having the same effects as the first example, the bulging portion 22 of the sealing material 2 can be formed more easily than the first example. It becomes possible.

図９，図１０は、本発明に係る二層管の分岐構造を実施するための形態の第３例を示すものである。   9 and 10 show a third example of a mode for carrying out a bilayer pipe branching structure according to the present invention.

第３例は、二層管本体１の拡開部１３における仕切壁１１の一部を内側へ向けてコ字形に切除している。切除の範囲については、二層管本体１の拡開部１３の軸長よりも少し短く、拡開部１３の内側面に沿って背高の低い突条１４が残置される程度とされている。   In the third example, a part of the partition wall 11 in the expanded portion 13 of the double-layer tube body 1 is cut out in a U-shape toward the inside. About the range of excision, it is a little shorter than the axial length of the expansion part 13 of the double-layered tube main body 1, and it is set as the grade where the short ridge 14 is left along the inner surface of the expansion part 13. .

さらに、二層管本体１の仕切壁１１の切除に対応して、シール材２に仕切壁１１，突条１４に係合する係合溝２３が刻設されている。この係合溝２３は、二層管本体１の突条１４に係合する側面係合溝２３ａと、二層管本体１の仕切壁１１の軸長方向の切除端１５と係合する底面係合溝２３ｂとからなる。なお、シール材２は、第１例の断面形状がＤ字に近似した形状の２個が一体化されている。   Furthermore, an engagement groove 23 that engages with the partition wall 11 and the protrusion 14 is formed in the sealing material 2 in correspondence with the cutting of the partition wall 11 of the double-layer tube body 1. The engaging groove 23 includes a side surface engaging groove 23 a that engages with the protrusion 14 of the double-layer tube body 1 and a bottom surface surface that engages with the cut end 15 in the axial length direction of the partition wall 11 of the double-layer tube body 1. It consists of a joint groove 23b. In addition, the sealing material 2 is integrated with two of the first example in which the cross-sectional shape of the first example is similar to a D-shape.

第３例によると、シール材２を二層管本体１の拡開部１３に嵌合させる際に、シール材２の係合溝２３の側面係合溝２３ａを二層管本体１の突条１４に係合させることで、嵌合の押込みのガイドとしての機能を奏させることができる。また、シール材２の係合溝２３の底面係合溝２３ｂを二層管本体１の切除端１５に係合させることで、嵌合の押込みの限界を規制することができる。また、二層管本体１の拡開部１３のカシメの際には、二層管本体１の突条１４，切除端１５とシール材２の係合溝２３との係合によって、シール材２の無用の位置ずれを防止することができる。   According to the third example, when the sealing material 2 is fitted into the expanded portion 13 of the double-layer tube body 1, the side surface engaging groove 23 a of the engaging groove 23 of the sealing material 2 is formed on the protrusion of the double-layer tube body 1. By engaging with 14, a function as a fitting push-in guide can be achieved. Further, by engaging the bottom surface engaging groove 23 b of the engaging groove 23 of the sealing material 2 with the cut end 15 of the double-layer tube body 1, it is possible to regulate the limit of pushing in the fitting. Further, when the expanding portion 13 of the double-layer tube body 1 is caulked, the seal material 2 is engaged by the engagement between the protrusions 14 and the cut ends 15 of the double-layer tube body 1 and the engagement grooves 23 of the seal material 2. Unnecessary misalignment can be prevented.

以上、図示した各例の外に、二層管本体１の拡開部１３や分岐管３のビード３１，３２を他の製造手段で製造することも可能である。   As described above, in addition to the illustrated examples, the expanding portion 13 of the double-layer tube body 1 and the beads 31 and 32 of the branch tube 3 can be manufactured by other manufacturing means.

本発明に係る二層管の分岐構造は、自動車の暖房装置以外の流体の流通にも適用することが可能である。   The bifurcated structure of the two-layer pipe according to the present invention can also be applied to the flow of fluid other than the heating device of an automobile.

１ 二層管本体
１１ 仕切壁
１２ 流通路
１３ 拡開部
２ シール材
２１ 挿通孔
２２ 膨出部
２３ 係合溝
３ 分岐管
３１，３２ ビード DESCRIPTION OF SYMBOLS 1 Two-layer pipe main body 11 Partition wall 12 Flow path 13 Expanding part 2 Sealing material 21 Insertion hole 22 Expansion part 23 Engaging groove 3 Branch pipe 31, 32 Bead

Claims (6)

流体の２つの流通路が並設一体化された二層管本体の端部に接続端末となる２本の分岐管が設けられた二層管の分岐構造において、二層管本体の端口が拡開された拡開部に弾性を有するシール材を介して２本の別部材の分岐管がそれぞれ挿入され、二層管本体の拡開部がカシメられることによって分岐管が二層管本体に固定されていることを特徴とする二層管の分岐構造。   In a two-layer pipe branch structure in which two branch pipes serving as connection terminals are provided at the end of a two-layer pipe body in which two fluid flow paths are arranged side by side, the end of the two-layer pipe body is expanded. Two separate branch pipes are inserted into the opened expanded part via elastic sealing material, and the expanded part of the two-layer pipe body is crimped to fix the branch pipe to the two-layer pipe body. A bilayer pipe branch structure characterized by being made. 請求項１の二層管の分岐構造において、二層管本体は中央の直径方向に仕切壁を有する断面形状が円形に形成され、二層管本体に設けられた拡開部は仕切壁に直交する方向へ拡開されていることを特徴とする二層管の分岐構造。   2. The bilayer pipe branching structure according to claim 1, wherein the double layer pipe body has a circular cross-sectional shape having a partition wall in the central diametrical direction, and the widened portion provided in the double layer pipe body is orthogonal to the partition wall. A bi-layer pipe branching structure characterized by being expanded in the direction of the direction. 請求項２の二層管の分岐構造において、シール材は中央部に分岐管が挿通される挿通孔を有して二層管本体の拡開部に嵌合されるブロック体に形成され、分岐管は先端部と先端部から軸方向に少し離された箇所とに挿通したシール材を保持するビードが設けられていることを特徴とする二層管の分岐構造。   The bifurcated structure of the two-layer pipe according to claim 2, wherein the sealing material is formed in a block body having an insertion hole through which the branch pipe is inserted at the center portion and fitted into the expanded portion of the two-layer pipe body. A double-layered pipe branching structure characterized in that the pipe is provided with a bead for holding a sealing material inserted through a tip portion and a portion slightly separated from the tip portion in the axial direction. 請求項３の二層管の分岐構造において、二層管本体は拡開部の仕切壁の一部が端口から内部側に向けて切除され、シール材は二層管本体の拡開部の仕切壁の切除端に係合する係合溝が設けられていることを特徴とする二層管の分岐構造。   4. The bilayer pipe branching structure according to claim 3, wherein a part of the partition wall of the expanded portion is cut from the end opening toward the inside side of the double layer tube body, and the sealing material is a partition of the expanded portion of the double layer tube body. A bifurcated structure of a two-layer tube, wherein an engagement groove is provided to engage with a cut end of a wall. 請求項３または４の二層管の分岐構造において、シール材は外側面の二層管本体の拡開部の仕切壁の隅部に対面する部分に外側へ突出した膨出部が設けられていることを特徴とする二層管の分岐構造。   The bifurcated structure of the two-layer pipe according to claim 3 or 4, wherein the sealing material is provided with a bulging portion protruding outward at a portion facing the corner of the partition wall of the expanded portion of the double-layer tube body on the outer surface. A bi-layer pipe branch structure characterized by having 請求項３または４の二層管の分岐構造において、シール材は挿通孔の内周面の二層管本体の拡開部の仕切壁の隅部に対面する部分に内側へ突出した膨出部が設けられていることを特徴とする二層管の分岐構造。   5. A bifurcated structure of a two-layer pipe according to claim 3 or 4, wherein the sealing material protrudes inward from a portion of the inner peripheral surface of the insertion hole facing the corner of the partition wall of the expanded portion of the two-layer pipe body. A bifurcated structure of a two-layer pipe, characterized in that is provided.
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KR101509062B1 (en) * 2013-09-02 2015-04-07 노종현 Hoses for PVC welding machine
CN110056719A (en) * 2019-05-15 2019-07-26 黄孚 Buried compound pipeline complex pipeline
DE102018108411A1 (en) * 2018-04-10 2019-10-10 Scherdel Innotec Forschungs- Und Entwicklungs-Gmbh A method for solderless forming a connection spigot at a pipe end and pipe with a solderless formed connecting piece at a pipe end
JP2020180681A (en) * 2019-04-26 2020-11-05 株式会社渡辺製作所 Method for manufacturing double pipe joint structure and joint structure

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KR101509062B1 (en) * 2013-09-02 2015-04-07 노종현 Hoses for PVC welding machine
DE102018108411A1 (en) * 2018-04-10 2019-10-10 Scherdel Innotec Forschungs- Und Entwicklungs-Gmbh A method for solderless forming a connection spigot at a pipe end and pipe with a solderless formed connecting piece at a pipe end
DE102018108411B4 (en) 2018-04-10 2022-06-30 Scherdel Innotec Forschungs- Und Entwicklungs-Gmbh Method for forming a connecting piece on a tube end without soldering, and tube with a connecting piece formed without soldering on a tube end
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CN110056719B (en) * 2019-05-15 2021-01-29 黄山顺涛管业有限公司 Buried composite pipeline

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