JP2007009954A - Structure of branched part of double pipe and its manufacturing method - Google Patents

Structure of branched part of double pipe and its manufacturing method Download PDF

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Publication number
JP2007009954A
JP2007009954A JP2005188692A JP2005188692A JP2007009954A JP 2007009954 A JP2007009954 A JP 2007009954A JP 2005188692 A JP2005188692 A JP 2005188692A JP 2005188692 A JP2005188692 A JP 2005188692A JP 2007009954 A JP2007009954 A JP 2007009954A
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Prior art keywords
pipe
tube
outer tube
double
double pipe
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Inventor
Nobuo Ichimura
信雄 市村
Yoshikazu Takamatsu
由和 高松
Susumu Sato
佐藤　　進
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Marelli Corp
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Calsonic Kansei Corp
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Priority to JP2005188692A priority Critical patent/JP2007009954A/en
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  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double pipe capable of dispensing with a branched pipe by closing and joining an internal pipe and an external pipe closely and mutually while the internal pipe passes through the external pipe through a through hole in both curved parts. <P>SOLUTION: This double pipe 1 is provided with the external pipe 10 and the internal pipe 20 having smaller diameter than that of the external pipe 10. The external pipe 10 is provided with a main body part 11, end parts 13 bent in the main body part 11 on both end sides of the main body part 11 through empty curved parts 12, and the through holes 12c provided in respective curved parts 12 and supporting the internal pipe 20 by passing through it. The internal pipe 20 and the external pipe 10 are closely closed and joined while the internal pipe 20 passes through the external pipe 10 through both through holes 12c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、外管内に内管を貫通させた二重管及びその製造方法に関する。   The present invention relates to a double pipe having an inner pipe penetrated into an outer pipe and a method for manufacturing the same.

外管の内部に内管を設けて二重の流路が得られるようにした二重管がある。このような二重管を用いると、配管レイアウトをシンプル且つコンパクトにできるので、配管レイアウトが大きく制限される場合には有利である。特に車両用空調装置のように車体構造等によって配管レイアウトが大きく制限される場合には非常に有利である。また、二重管を用いると、空調装置の組立作業も簡素化されることになり、製造コストの低減も可能となる。   There is a double pipe in which an inner pipe is provided inside the outer pipe so that a double flow path can be obtained. The use of such a double pipe is advantageous when the pipe layout is greatly limited because the pipe layout can be made simple and compact. This is particularly advantageous when the piping layout is largely limited by the vehicle body structure or the like, such as a vehicle air conditioner. In addition, when the double pipe is used, the assembly work of the air conditioner is simplified, and the manufacturing cost can be reduced.

この種の二重管には、例えば特許文献１に開示されるようなものがある。特許文献１の二重管は、外管と内管と二本の分岐管とを備え、断面めがね状に加工された外管の開口端部に内管および分岐管を挿入した状態でろう付けした構造である。
特開昭５８−１２１３９４号公報 As this type of double tube, for example, there is one disclosed in Patent Document 1. The double pipe of Patent Document 1 includes an outer pipe, an inner pipe, and two branch pipes, and is brazed in a state in which the inner pipe and the branch pipe are inserted into the open end of the outer pipe processed into a cross-section glasses shape. This is the structure.
JP 58-121394 A

しかしながら、前記従来の二重管は、二重管の両端に分岐管が必要になるため、部品点数が多い。また、断面めがね状に加工した外管の開口端部と、この開口端部に挿入される内管および分岐管と、の隙間をろう付けで密閉しても、密閉耐久性を向上させるのが難しい。   However, since the conventional double pipe requires branch pipes at both ends of the double pipe, the number of parts is large. Moreover, even if the gap between the opening end of the outer tube processed into a cross-section glasses shape and the inner tube and the branch tube inserted into the opening end is sealed by brazing, the sealing durability can be improved. difficult.

本発明は上記事情を考慮し、部品点数が少ない二重管の提供を目的とする。   In view of the above circumstances, an object of the present invention is to provide a double pipe with a small number of parts.

請求項１の発明は、外管と、前記外管より小径の内管と、を備える二重管であって、前記外管は、本体部と、前記本体部の両端側で該本体部にから湾曲部を介して折り曲げられた端部と、前記外管のそれぞれの湾曲部に設けられ且つ前記内管を貫通支持する貫通孔と、を備え、前記両貫通孔を通じて前記内管が前記外管を貫通した状態で、前記内管と前記外管とが密閉接合されていることを特徴とする。   The invention of claim 1 is a double tube comprising an outer tube and an inner tube having a smaller diameter than the outer tube, the outer tube being connected to the main body at both ends of the main body and the main body. End portions bent through curved portions, and through holes provided in the respective curved portions of the outer tube and supporting the inner tube through the inner tube, and the inner tube passes through the both through holes. The inner tube and the outer tube are hermetically joined in a state of penetrating the tube.

請求項２の発明は、請求項１に記載の二重管であって、前記二重管の少なくとも一方の端部では、前記内管の端部が前記外管の端部に沿って折り曲げられていることを特徴とする。   A second aspect of the invention is the double pipe according to the first aspect, wherein an end of the inner pipe is bent along an end of the outer pipe at at least one end of the double pipe. It is characterized by.

請求項３の発明は、請求項２に記載の二重管であって、前記内管の端部と前記外管の端部とに共に固定された板状またはブロック状の継手フランジをさらに備えることを特徴とする。   Invention of Claim 3 is a double pipe of Claim 2, Comprising: The plate-shaped or block-shaped joint flange fixed together to the edge part of the said inner pipe and the edge part of the said outer pipe is further provided. It is characterized by that.

請求項４の発明は、二重管の製造方法であって、外管と、前記外管よりも小径の内管と、を備える工程と、前記外管の両端側を曲げて該両端側に湾曲部を形成する工程と、前記外管の湾曲部に貫通孔を形成する工程と、前記外管の両貫通孔を通じて前記外管に前記内管を貫通させる工程と、前記外管の両貫通孔と前記内管とを密閉接合する工程と、を備えることを特徴とする。   The invention of claim 4 is a method of manufacturing a double pipe, comprising a step comprising an outer pipe and an inner pipe having a smaller diameter than the outer pipe, and bending both end sides of the outer pipe to the both end sides. A step of forming a bending portion; a step of forming a through hole in the bending portion of the outer tube; a step of passing the inner tube through the outer tube through both through holes of the outer tube; And a step of hermetically bonding the hole and the inner tube.

請求項５の発明は、請求項４に記載の二重管の製造方法であって、前記外管に前記内管を貫通させる工程の前に、前記内管の挿入基端側の端部を折り曲げておく工程をさらに含むことを特徴とする。   The invention of claim 5 is the method for manufacturing a double pipe according to claim 4, wherein the end of the inner pipe on the insertion base end side is inserted before the step of passing the inner pipe through the outer pipe. The method further includes a step of bending.

請求項６の発明は、請求項４に記載の二重管であって、前記外管に前記内管を貫通させる工程の前に、前記内管の挿入基端側の端部を折り曲げておく工程をさらに含み、前記内管を前記外管に貫通させる工程の後に、前記内管の挿入先端側の端部を前記外管の端部に沿って折り曲げる工程をさらに含むことを特徴とする。   The invention according to claim 6 is the double pipe according to claim 4, wherein the end of the inner pipe on the insertion base end side is bent before the step of passing the inner pipe through the outer pipe. The method further includes a step of bending the end of the inner tube on the insertion tip side along the end of the outer tube after the step of passing the inner tube through the outer tube.

請求項７の発明は、請求項５または６に記載の二重管の製造方法であって、板状またはブロック状の継手フランジを、前記内管の端部と前記外管の端部と共に固定する工程を含むことを特徴とする。   The invention of claim 7 is the method of manufacturing a double pipe according to claim 5 or 6, wherein a plate-like or block-like joint flange is fixed together with an end of the inner pipe and an end of the outer pipe. Including the step of:

請求項８の発明は、請求項４〜７の何れか１項に記載の二重管の製造方法であって、前記密閉接合の後に、二重管の両端部の間の部位において外管に力を加えて二重管を曲げる工程をさらに含むことを特徴とする。   Invention of Claim 8 is a manufacturing method of the double pipe of any one of Claims 4-7, Comprising: After the said sealing joining, it is made to an outer pipe in the part between the both ends of a double pipe. The method further includes the step of bending the double tube by applying force.

請求項１の発明によれば、分岐管が不要となる。また、外管の開口端部に加工しただるま状またはめがね状の開口端部に、内管および分岐管を支持して密閉接合する構造とは異なり、接合部分の構造が複雑ではないため、接合部分の密閉性を高く維持できる。   According to invention of Claim 1, a branch pipe becomes unnecessary. Unlike the structure in which the inner pipe and the branch pipe are supported and hermetically bonded to the open end of the outer tube that is processed into the open end of the outer pipe, the structure of the joint is not complicated. The sealability of the part can be kept high.

請求項２の発明によれば、二重管の端部において、内管の端部と外管の端部とが近接することで、二重管に対する接続配管の接続作業性が向上する。   According to the second aspect of the present invention, at the end of the double pipe, the end of the inner pipe and the end of the outer pipe are close to each other, thereby improving the connection workability of the connection pipe to the double pipe.

請求項３の発明によれば、さらに二重管に対する接続配管の接続作業性が向上する。   According to invention of Claim 3, the connection workability | operativity of the connection piping with respect to a double pipe improves further.

請求項４の発明によれば、二重管の製造方法であって、分岐管が不要となる。また、外管の端部に加工しただるま状またはめがね状の開口端部に、内管および分岐管を支持して密閉接合する構造とは異なり、接合部分の構造が複雑ではないため、接合部分の密閉性を高く維持できる。   According to invention of Claim 4, it is a manufacturing method of a double pipe, Comprising: A branch pipe becomes unnecessary. Unlike the structure in which the inner pipe and the branch pipe are supported and hermetically joined to the open end of the sagittal or eyeglass shape processed at the end of the outer pipe, the structure of the joint is not complicated. High sealing performance can be maintained.

請求項５の発明によれば、二重管の一方の端部において内管の端部が外管の端部に沿った構造となる。この構造では、二重管の一方の端部において、内管の端部と外管の端部とが近接することで、二重管に対する接続配管の接続作業性が向上する。   According to the invention of claim 5, the end of the inner tube is structured along the end of the outer tube at one end of the double tube. In this structure, at one end of the double pipe, the end of the inner pipe and the end of the outer pipe are close to each other, thereby improving the connection workability of the connection pipe to the double pipe.

請求項６の発明によれば、二重管の両端部において内管の端部が外管の端部に沿った構造となる。この構造では、二重管の両端部において、内管の端部と外管の端部とが近接するため、二重管に対する接続配管の接続作業性が向上する。   According to the invention of claim 6, the end of the inner tube is structured along the end of the outer tube at both ends of the double tube. In this structure, since the end of the inner tube and the end of the outer tube are close to each other at both ends of the double tube, the connection workability of the connection pipe to the double tube is improved.

請求項７の発明によれば、請求項５または６の発明の効果に加え、二重管の端部に継手フランジを備えるため、さらに二重管に対する接続配管の接続作業性が向上する。   According to the invention of claim 7, in addition to the effect of the invention of claim 5 or 6, since the joint flange is provided at the end of the double pipe, the connection workability of the connection pipe to the double pipe is further improved.

請求項８の発明によれば、請求項４〜７の何れかの発明の効果に加え、レイアウト自由度がでる。   According to the invention of claim 8, in addition to the effect of the invention of any of claims 4 to 7, the degree of freedom in layout can be achieved.

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.

第１実施形態
図１は第１実施形態の二重管を示し図２〜図７は第１実施形態の二重管の製造方法を示す。 First Embodiment FIG. 1 shows a double tube according to the first embodiment, and FIGS. 2 to 7 show a method for manufacturing the double tube according to the first embodiment.

図１（ａ）に示すように、二重管１は、外管１０と、外管１０より小径の内管２０と、を備える。内管２０は第１の流体Ｌ１を流し、外管１０と内管２０との間（外管１０の内周面と内管２０の外周面との間）には第２の流体Ｌ２を流す。この二重管１は、従来のように（例えば特開２００２−２２８０７２参照）外管と内管とはリブを介して一体成形されたものではなく、それぞれ別々に用意された大径の外管１０と小径の内管２０とが組み合わされて製造される。   As shown in FIG. 1A, the double tube 1 includes an outer tube 10 and an inner tube 20 having a smaller diameter than the outer tube 10. The inner tube 20 flows the first fluid L1, and the second fluid L2 flows between the outer tube 10 and the inner tube 20 (between the inner peripheral surface of the outer tube 10 and the outer peripheral surface of the inner tube 20). . In the double pipe 1, the outer pipe and the inner pipe are not integrally formed via ribs as in the prior art (see, for example, JP-A-2002-228072), but a large-diameter outer pipe prepared separately. 10 and a small-diameter inner tube 20 are combined.

外管１０は、長手方向中央側の直線状の本体部１１と、この本体部１１の長手方向両端側で該本体部１１から湾曲部１２を介して折り曲げられた端部１３と、を備える。外管１０の両湾曲部１２のアウトコーナ側１２ｂには、内管２０を貫通支持する貫通孔１２ｃが設けられている。両貫通孔１２ｃを通じて内管２０が外管１０の本体部１１を貫通している。外管１０の両貫通孔１２ｃの内周面に内管２０の外周面が保持された状態で、両貫通孔１２ｃの内周面と内管２０の外周面とが密閉接合されている。この例では接合は、ろう材によるろう付け接合である。   The outer tube 10 includes a linear main body portion 11 on the center side in the longitudinal direction, and end portions 13 that are bent from the main body portion 11 via the bending portion 12 at both longitudinal ends of the main body portion 11. A through-hole 12 c that penetrates and supports the inner tube 20 is provided on the outer corner side 12 b of both the curved portions 12 of the outer tube 10. The inner tube 20 passes through the main body 11 of the outer tube 10 through both through holes 12c. In a state where the outer peripheral surface of the inner tube 20 is held on the inner peripheral surfaces of both the through holes 12c of the outer tube 10, the inner peripheral surface of both the through holes 12c and the outer peripheral surface of the inner tube 20 are hermetically joined. In this example, the joining is brazing joining with a brazing material.

両貫通孔１２ｃは外管１０の本体部１１の延在方向Ｘから見て本体部１１の内周面より内径側に位置している。つまり、両貫通孔１２ｃに支持される内管２０の外周面は、外管１０の本体部１１の内周面と離間している。なおこの例では、両貫通孔１２ｃは外管の本体部１１の軸心と一致している。これにより、内管２０の外周面は、外管１０の本体部１１の内周面と離間している。このため、二重管１が車両などの振動体に搭載されて振動したとしても、外管１０と内管２０とが断続的に接触してビビリ音が発生してしまうことが防止される。   Both through-holes 12 c are located on the inner diameter side of the inner peripheral surface of the main body 11 when viewed from the extending direction X of the main body 11 of the outer tube 10. That is, the outer peripheral surface of the inner tube 20 supported by both the through holes 12 c is separated from the inner peripheral surface of the main body portion 11 of the outer tube 10. In this example, both through holes 12c coincide with the axis of the main body 11 of the outer tube. Thereby, the outer peripheral surface of the inner tube 20 is separated from the inner peripheral surface of the main body portion 11 of the outer tube 10. For this reason, even if the double pipe 1 is mounted on a vibration body such as a vehicle and vibrates, the outer pipe 10 and the inner pipe 20 are prevented from intermittently coming into contact with each other to generate chatter noise.

上述の外管１０の支持される内管２０は、外管１０の本体部１１より長い直線状の本体部２１を備え、この本体部２１が外管１０の本体部１１を完全に貫通している。内管２０の両端部２３は即ち内管２０の本体部２１の長手方向両端側は、該本体部２１に対して湾曲部２２を介して折り曲げられている。この内管２０の各端部２３は、外管１０の各端部２３と略平行に設けられ、内管２０の開口端２０ｂと外管１０の開口端１０ｂとは近接している。   The inner tube 20 supported by the outer tube 10 includes a linear main body 21 longer than the main body 11 of the outer tube 10, and the main body 21 completely penetrates the main body 11 of the outer tube 10. Yes. Both end portions 23 of the inner tube 20, that is, both ends in the longitudinal direction of the main body portion 21 of the inner tube 20 are bent with respect to the main body portion 21 via curved portions 22. Each end 23 of the inner tube 20 is provided substantially parallel to each end 23 of the outer tube 10, and the opening end 20 b of the inner tube 20 and the opening end 10 b of the outer tube 10 are close to each other.

二重管１の一端部（つまり外管１０の一端部および内管２０の一端部）には板状の継手フランジ３０が固定されている。また同様に、二重管１の他端部（つまり外管および内管の他端部）には板状の継手フランジ３０が固定されている。これら継手フランジ３０は、板状の本体部３１と、厚み方向に貫通形成され且つ外管１０を保持する外管保持孔３２と、同じく厚み方向に貫通形成され且つ内管２０を保持する内管保持孔３３と、を備える。これら保持孔３２、３３はいずれも、基端に設けられ先端側に向けて拡径するテーパ部３２ａ、３３ａと、該テーパ部３２ａ、３３ａを介して管１０、２０の一般部により大径に形成された大径部３２ｂ、３３ｂと、大径部３２ｂ、３３ｂから先端側の向けてさらに拡径するテーパ部３２ｃ、３３ｃと、を備える。この保持孔３２、３３の内周面に対して、外管１０および内管２０の端部１３、２３が密着するように拡管され、これにより外管１０の端部１３および内管２０の端部２３に継手フランジ３０が固定される。   A plate-like joint flange 30 is fixed to one end of the double pipe 1 (that is, one end of the outer pipe 10 and one end of the inner pipe 20). Similarly, a plate-like joint flange 30 is fixed to the other end of the double pipe 1 (that is, the other end of the outer pipe and the inner pipe). The joint flange 30 includes a plate-shaped main body portion 31, an outer tube holding hole 32 that is formed to penetrate in the thickness direction and holds the outer tube 10, and an inner tube that is also formed to penetrate in the thickness direction and holds the inner tube 20. Holding hole 33. Each of these holding holes 32 and 33 has a tapered portion 32a and 33a which is provided at the proximal end and expands toward the distal end side, and has a larger diameter than the general portion of the tubes 10 and 20 through the tapered portions 32a and 33a. The formed large-diameter portions 32b and 33b and tapered portions 32c and 33c that further increase in diameter from the large-diameter portions 32b and 33b toward the distal end side are provided. The outer tube 10 and the inner tube 20 are expanded so that the end portions 13 and 23 of the outer tube 10 and the inner tube 20 are in close contact with the inner peripheral surfaces of the holding holes 32 and 33, thereby the end portion 13 of the outer tube 10 and the end of the inner tube 20. The joint flange 30 is fixed to the portion 23.

このような継手フランジ３０に対して図１（ａ）（ｂ）中二点鎖線で示す相手方の継手フランジ５０を重ね合わせた状態で、継手フランジ３０に設けられたネジ穴３４に相手方の継手フランジ５０に設けられた貫通孔５４を介して締結手段としてのネジ５５をネジ込むことにより、両継手フランジ３０、５０を締結できるようになっている。このとき、相手方の継手フランジ５０に固定された配管５１、５２が外管１０の開口端１０ｂおよび内管２０の開口端２０ｂに嵌め入れられて接続される。なお、図１中符号ＳはＯリングである。   In the state where the mating joint flange 50 indicated by a two-dot chain line in FIGS. 1A and 1B is superimposed on such a joint flange 30, the mating joint flange is inserted into the screw hole 34 provided in the joint flange 30. Both joint flanges 30 and 50 can be fastened by screwing screws 55 as fastening means through through holes 54 provided in 50. At this time, the pipes 51 and 52 fixed to the mating joint flange 50 are fitted and connected to the opening end 10b of the outer tube 10 and the opening end 20b of the inner tube 20. In FIG. 1, symbol S is an O-ring.

次に、上述の二重管の製造方法の一例をついて説明する。   Next, an example of a method for manufacturing the above-described double pipe will be described.

外管の曲げ工程
まず、図２（ａ）に示す直線状の外管１０の長手方向両端側を、図示せぬベンダーなどにより、図２（ｂ）に示すように所定の曲率で折り曲げる。折り曲げられた角の部分が所定の曲率の湾曲部１２となる。 Bending process of outer tube First, both ends in the longitudinal direction of the linear outer tube 10 shown in FIG. 2A are bent with a predetermined curvature as shown in FIG. The bent corner portion becomes the curved portion 12 having a predetermined curvature.

貫通孔成形工程
次に、外管１０の両端側の湾曲部１２に対してそれぞれ、図２（ｃ）に示すように貫通孔を形成する。この貫通孔１２ｃは、外管１０の中央側の本体部１１の長手方向（延在方向）Ｘに沿う。 Through-hole forming step Next, through-holes are formed in the curved portions 12 on both ends of the outer tube 10 as shown in FIG. The through hole 12 c extends along the longitudinal direction (extending direction) X of the main body 11 on the center side of the outer tube 10.

より具体的には、まず図３（ａ）に示すように外管１０の端部１３の開口端から該端部１３の中に芯金６１を挿入し、該芯金６１の先端側の円弧状の湾曲面６１ａを外管１０の湾曲部１２のアウトコーナ側の内周面に密着させる。この状態で、外管１０の本体部１１の軸心上に、該本体部１１の延在方向Ｘに向けて打撃可能なパンチ６３を配置する。そして、図３（ｂ）に示すようにパンチ６３の先端に形成された刃部６４ａを有する貫通孔成形部６４により、外管１０の湾曲部１２のアウトコーナ側の管壁に貫通孔１２ｃを形成する。なお、芯金６１には、パンチ６３の貫通孔成形部６４を挿入・離脱可能な穴６２が設けられている。図３（ｂ）中の符号６５は切り屑である。   More specifically, first, as shown in FIG. 3A, the cored bar 61 is inserted into the end 13 from the open end of the end 13 of the outer tube 10, and the tip side circle of the cored bar 61 is inserted. The arc-shaped curved surface 61a is brought into close contact with the inner peripheral surface of the curved portion 12 of the outer tube 10 on the out corner side. In this state, a punch 63 that can be struck in the extending direction X of the main body 11 is disposed on the axis of the main body 11 of the outer tube 10. And as shown in FIG.3 (b), the through-hole 12c is made in the tube wall by the side of the outer corner of the curved part 12 of the outer tube 10 by the through-hole formation part 64 which has the blade part 64a formed in the front-end | tip of the punch 63. Form. The cored bar 61 is provided with a hole 62 into which the through-hole forming part 64 of the punch 63 can be inserted and removed. The code | symbol 65 in FIG.3 (b) is a chip.

なお、貫通孔成形工程の変形例としては図８に示すような方法でもよい。つまり、図３（ａ）に示すように外管１０の中に芯金６１を挿入した状態で貫通孔１２ｃを形成するのではなく、外管１０を外側からクランプ７３（７３ａおよび７３ｂ）により保持した状態で貫通孔１２ｃを形成してもよい。   In addition, as a modification of the through hole forming step, a method as shown in FIG. 8 may be used. That is, as shown in FIG. 3A, the through hole 12c is not formed with the cored bar 61 inserted into the outer tube 10, but the outer tube 10 is held from the outside by the clamps 73 (73a and 73b). You may form the through-hole 12c in the state which carried out.

内管の第１の曲げ工程
図２、図３で説明した外管の加工工程とは別に、図４（ａ）（ｂ）に示すように、直線状の内管２０の一端側を図示せぬベンダーなどにより、所定の曲率で折り曲げる。折り曲げられた角の部分が所定の曲率の湾曲部２２となる。 First Inner Bending Process Separately from the outer pipe processing steps described in FIGS. 2 and 3, one end side of the linear inner pipe 20 is illustrated as shown in FIGS. 4 (a) and 4 (b). Bend with a predetermined curvature using a bender. The bent corner portion becomes the curved portion 22 having a predetermined curvature.

内管の挿入工程
次に、折り曲げた内管２０を、図５（ａ）（ｂ）に示すように外管１０に貫通させる。内管２０の挿入は、外管１０の両湾曲部１２の貫通孔１２ｃを通じて行なう。内管２０のまだ曲げられていない方の端部２３を挿入先端部とし、既に曲げられた方の端部２３を挿入基端部とする。 Inner Tube Inserting Step Next, the bent inner tube 20 is passed through the outer tube 10 as shown in FIGS. The inner tube 20 is inserted through the through-holes 12 c of the two bending portions 12 of the outer tube 10. The end 23 of the inner tube 20 that has not yet been bent is the insertion tip, and the end 23 that has already been bent is the insertion base.

内管の第２の曲げ工程
次に、貫通された内管２０のうち、外管１０から突出する直線状の端部２３を、図５（ｂ）（ｃ）に示すように外管１０の端部２３に沿って折り曲げる。 2nd bending process of an inner pipe Next, the linear edge part 23 which protrudes from the outer pipe | tube 10 among the penetrated inner pipe | tubes 20 of the outer pipe | tube 10 is shown in FIG.5 (b) (c). Bend along end 23.

ろう付け工程
次に、図６（ａ）（ｂ）に示すように、内管２０と外管１０とを所定の接合位置に位置決めした状態で、外管１０の外周面のうち貫通孔１２ｃの近傍または内管２０の外周面のうち貫通孔１２ｃに保持された部分の近傍に、自動給線機６７によりロウ材６８を供給しつつ図示せぬバーナーで加熱し、外管１０の貫通孔１２ｃを密閉ろう付けする。 Next, as shown in FIGS. 6A and 6B, in the state where the inner tube 20 and the outer tube 10 are positioned at a predetermined joining position, the through hole 12c of the outer peripheral surface of the outer tube 10 is formed. The brazing material 68 is supplied to the vicinity or the vicinity of the outer peripheral surface of the inner pipe 20 held by the through-hole 12 c while being heated by a burner (not shown) while supplying the brazing material 68 by the automatic feeder 67. Seal the braze.

継手フランジの接続工程
次に、図６の工程で互いに接合された外管１０および内管２０の湾曲部１２、２２の近傍部位を、図７（ａ）に示すようにクランプ６９に固定し、該クランプ６９に設けられた座面６９ａに板状の継手フランジ３０を配置する。このとき、継手フランジ３０の内管保持孔３３の内側に内管２０の端部２３を挿入し、また、継手フランジ３０の外管保持孔３２の内側に外管１０の端部１３を挿入した状態とする。 Step of connecting joint flange Next, the vicinity of the curved portions 12 and 22 of the outer tube 10 and the inner tube 20 joined together in the step of FIG. 6 is fixed to the clamp 69 as shown in FIG. A plate-like joint flange 30 is disposed on a seating surface 69 a provided on the clamp 69. At this time, the end portion 23 of the inner tube 20 was inserted inside the inner tube holding hole 33 of the joint flange 30, and the end portion 13 of the outer tube 10 was inserted inside the outer tube holding hole 32 of the joint flange 30. State.

そして、図７（ｂ）に示すようにパンチ７１で外管１０および内管２０の端部１３、２３を拡管し、内管の端部２３を内管保持孔３３に密着させ且つ外管１０の端部１３を外管保持孔３２に密着させる。これにより、外管１０の一端部１３および内管２０の一端部２３と継手フランジ３０とが一体化する。他端側においても同様の工程を経て、外管１０の他端部１３および内管２０の他端部１３と継手フランジ３０を一体化する。これにより図１に示す二重管１が得られる。   Then, as shown in FIG. 7B, the end portions 13 and 23 of the outer tube 10 and the inner tube 20 are expanded by the punch 71, the end portion 23 of the inner tube is brought into close contact with the inner tube holding hole 33, and the outer tube 10. The end portion 13 is closely attached to the outer tube holding hole 32. Thereby, the one end 13 of the outer tube 10, the one end 23 of the inner tube 20, and the joint flange 30 are integrated. The other end portion 13 of the outer tube 10 and the other end portion 13 of the inner tube 20 and the joint flange 30 are integrated through the same process on the other end side. Thereby, the double tube 1 shown in FIG. 1 is obtained.

次に第１実施形態の効果をまとめる。   Next, the effects of the first embodiment will be summarized.

（１）第１実施形態の二重管１は、外管１０と内管２０とを備え、外管１０は長手方向両端側に貫通孔１２ｃを有する湾曲部１２を備え、両湾曲部１２の貫通孔１２ｃを通じて内管２０が外管１０を貫通した状態で、内管２０と外管１０とが密閉接合されている。そのため、従来技術とは異なり、分岐管が不要となる。また、従来技術のような外管の開口端部に２本の管（つまり内管および分岐管）挿入して密閉接合する構造と比べ、密閉性を確保しやすい。   (1) The double tube 1 of the first embodiment includes an outer tube 10 and an inner tube 20, and the outer tube 10 includes a curved portion 12 having through holes 12c on both ends in the longitudinal direction. The inner tube 20 and the outer tube 10 are hermetically joined with the inner tube 20 penetrating the outer tube 10 through the through hole 12c. Therefore, unlike the prior art, a branch pipe is not required. Further, as compared with a structure in which two pipes (that is, an inner pipe and a branch pipe) are inserted into the opening end portion of the outer pipe as in the prior art and hermetically joined, it is easy to ensure hermeticity.

（２）第１実施形態の二重管１は、二重管１の少なくとも一方の端部では、内管２０の端部２３が外管１０の端部１３に沿って折り曲げられている。そのため、内管２０の開口端と外管１０の開口端とが近接して、二重管１に対する接続配管５１、５２の接続作業性が向上する。   (2) In the double tube 1 of the first embodiment, the end 23 of the inner tube 20 is bent along the end 13 of the outer tube 10 at at least one end of the double tube 1. Therefore, the open end of the inner pipe 20 and the open end of the outer pipe 10 are close to each other, and the connection workability of the connection pipes 51 and 52 to the double pipe 1 is improved.

（３）第１実施形態の二重管１は、内管２０の端部２３と外管１０の端部１３とに共に固定された板状またはブロック状の継手フランジ３０を備える。そのため、さらに二重管１に対する接続配管５１、５２の接続作業性が向上する。   (3) The double pipe 1 of the first embodiment includes a plate-like or block-like joint flange 30 fixed to the end 23 of the inner pipe 20 and the end 13 of the outer pipe 10 together. Therefore, the connection workability of the connection pipes 51 and 52 to the double pipe 1 is further improved.

（４）第１実施形態の二重管１の製造方法は、外管１０の両端側を曲げて該両端側に湾曲部１２を形成する工程と、外管１０の湾曲部１２に貫通孔１２ｃを形成する工程と、外管１０の両貫通孔１２ｃを通じて外管１０に内管２０を貫通させる工程と、外管１０の両貫通孔１２ｃと内管２０とを密閉接合する工程と、を備える。言い換えると、第１実施形態の二重管の製造方法は、外管１０の両端側を曲げて該両端側に湾曲部１２を形成し、外管１０の湾曲部１２に貫通孔１２ｃを形成し、外管１０の両貫通孔１２ｃを通じて外管１０に内管２０を貫通させ、外管１０の両貫通孔１２ｃと内管２０とを密閉接合したものである。   (4) The manufacturing method of the double tube 1 of the first embodiment includes a step of bending the both ends of the outer tube 10 to form the curved portions 12 on both ends, and a through hole 12c in the curved portion 12 of the outer tube 10. A step of forming the inner tube 20 through the outer tube 10 through both the through holes 12c of the outer tube 10, and a step of sealingly bonding the both through holes 12c of the outer tube 10 and the inner tube 20 to each other. . In other words, in the method of manufacturing the double pipe according to the first embodiment, the both ends of the outer tube 10 are bent to form the curved portions 12 at the both ends, and the through holes 12c are formed in the curved portion 12 of the outer tube 10. The inner tube 20 is passed through the outer tube 10 through both through holes 12c of the outer tube 10, and both the through holes 12c of the outer tube 10 and the inner tube 20 are hermetically joined.

そのため、従来技術とは異なり、分岐管が不要となる。また、従来のような外管の開口端部に２本（つまり内管および分岐管）を挿入して密閉接合する構造と比べ、接合部分の構造が複雑ではないため、密閉性を高く維持しやすい。   Therefore, unlike the prior art, a branch pipe is not required. Compared with the conventional structure in which two pipes (that is, the inner pipe and the branch pipe) are inserted into the open end of the outer pipe and hermetically joined, the structure of the joined portion is not complicated, so the sealing performance is kept high. Cheap.

（５）第１実施形態の二重管の製造方法は、外管１０に内管２０を貫通させる工程の前に、内管２０の挿入基端側の端部２３を折り曲げておく工程をさらに含む。そのため、二重管１の一方の端部において、内管２０の端部２３が外管１０の端部１３に沿った構造となる。この構造では、二重管１の一方の端部において、内管２０の開口端と外管１０の開口端とが近接するので、二重管１に対する接続配管５１、５２の接続作業性が向上する。   (5) The method of manufacturing the double pipe according to the first embodiment further includes a step of bending the end portion 23 on the insertion base end side of the inner pipe 20 before the step of passing the inner pipe 20 through the outer pipe 10. Including. Therefore, the end portion 23 of the inner tube 20 is structured along the end portion 13 of the outer tube 10 at one end portion of the double tube 1. In this structure, since the opening end of the inner tube 20 and the opening end of the outer tube 10 are close to each other at one end of the double tube 1, the connection workability of the connection pipes 51 and 52 to the double tube 1 is improved. To do.

（６）第１実施形態の二重管の製造方法は、外管１０に内管２０を貫通させる工程の前に、内管２０の挿入基端側の端部２３を折り曲げておく工程をさらに含み、内管２０を外管１０に貫通させる工程の後に、内管２０の挿入先端側の端部２３を外管１０の端部１３に沿って折り曲げる工程をさらに含む。   (6) The method of manufacturing the double tube according to the first embodiment further includes a step of bending the end portion 23 on the insertion proximal end side of the inner tube 20 before the step of causing the outer tube 10 to penetrate the inner tube 20. In addition, after the step of penetrating the inner tube 20 through the outer tube 10, the method further includes a step of bending the end portion 23 on the insertion distal end side of the inner tube 20 along the end portion 13 of the outer tube 10.

そのため、二重管１の両端部において内管２０の端部２３が外管１０の端部１３に沿った構造となる。この構造では、二重管１の両端部において内管２０の端部２３と外管１０の端部１３とが近接するため、二重管１に対する接続配管５１、５２の接続作業性がさらに向上する。   Therefore, the end portion 23 of the inner tube 20 is structured along the end portion 13 of the outer tube 10 at both ends of the double tube 1. In this structure, since the end portion 23 of the inner tube 20 and the end portion 13 of the outer tube 10 are close to each other at both ends of the double tube 1, the connection workability of the connection pipes 51 and 52 to the double tube 1 is further improved. To do.

（７）第１実施形態の二重管１の製造方法は、板状またはブロック状の継手フランジ３０を、内管２０の端部２３と外管１０の端部１３と共に固定する工程を含む。そのため、継手フランジ３０により、さらに二重管１に対する接続配管５１、５２の接続作業性が向上する。   (7) The manufacturing method of the double pipe 1 of the first embodiment includes a step of fixing the plate-like or block-like joint flange 30 together with the end 23 of the inner pipe 20 and the end 13 of the outer pipe 10. Therefore, the joint flange 30 further improves the connection workability of the connection pipes 51 and 52 to the double pipe 1.

次に、その他の実施形態を説明する。なお、第１実施形態と同様の構成については同一符号を付して構成およびその作用効果の説明を省略する。   Next, other embodiments will be described. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description of a structure and its effect is abbreviate | omitted.

第２実施形態
図９、１０を参照しつつ第２実施形態を説明する。 Second Embodiment A second embodiment will be described with reference to FIGS.

上述の第１実施形態では、外管１０および内管２０の端部１３、２３が雌型であったが、図１０に示す第２実施形態の二重管１は、外管１０および内管２０の端部１３、２３が雄型である。それに伴って継手フランジ３０と外管１０および内管２０の固定構造が第１実施形態とは異なっている。具体的には、外管１０および内管２０の端部１３、２３は、継手フランジ３０から突出している。また、外管１０および内管２０の端部１３、２３には径方向に突出するフランジ部１３ｆ、２３ｆが設けられている。一方、継手フランジ３０は、外管保持孔３２および内管保持孔３３の開口端の周縁部に環状の凹部３２ｆ、３３ｆが設けられている。この凹部３２ｆ、３３ｆに対して、外管１０および内管２０の端部１３、２３から径方向に突設されたフランジ部１３ｆ、２３ｆが密着し、これにより外管１０の端部１３および内管２０の端部２３に継手フランジ３０が固定されている。   In the first embodiment described above, the end portions 13 and 23 of the outer tube 10 and the inner tube 20 are female, but the double tube 1 of the second embodiment shown in FIG. The end portions 13 and 23 of the 20 are male. Accordingly, the fixing structure of the joint flange 30, the outer tube 10 and the inner tube 20 is different from that of the first embodiment. Specifically, the end portions 13 and 23 of the outer tube 10 and the inner tube 20 protrude from the joint flange 30. Further, end portions 13 and 23 of the outer tube 10 and the inner tube 20 are provided with flange portions 13f and 23f protruding in the radial direction. On the other hand, the joint flange 30 is provided with annular recesses 32 f and 33 f at the peripheral edge portions of the open ends of the outer tube holding hole 32 and the inner tube holding hole 33. Flange portions 13f and 23f projecting radially from the end portions 13 and 23 of the outer tube 10 and the inner tube 20 are in close contact with the recess portions 32f and 33f, whereby the end portion 13 and the inner portion of the outer tube 10 are in close contact. A joint flange 30 is fixed to the end 23 of the pipe 20.

この二重管１の製造方法は、第１実施形態で説明した図２〜図７の二重管の製造工程おいて、図７に替えて図９に示す継手フランジの接続工程を行うもので、その他の工程は第１実施形態と同様である。   The manufacturing method of the double pipe 1 is a process of connecting the joint flange shown in FIG. 9 in place of FIG. 7 in the manufacturing process of the double pipe of FIGS. 2 to 7 described in the first embodiment. Other processes are the same as those in the first embodiment.

図９の工程は、以下のように行う。   The process of FIG. 9 is performed as follows.

外管１０および内管２０の端部１３、２３にパンチ８１をパンチングして、フランジ部１３ｆ、２３ｆを形成しつつこのフランジ部１３ｆ、２３ｆを継手フランジ３０の外管保持孔３２および内管保持孔３３の開口端周縁の凹部３２ｆ、３３ｆに密着させる。これにより、外管１０および内管２０の端部１３、２３と継手フランジ３０とが一体化する。他端側においても同様の工程を経て、図１０に示す二重管１を得る。   A punch 81 is punched in the end portions 13 and 23 of the outer tube 10 and the inner tube 20 to form flange portions 13f and 23f, and the flange portions 13f and 23f are held in the outer tube holding hole 32 and the inner tube holding of the joint flange 30. The holes 33 are brought into close contact with the recesses 32f and 33f at the periphery of the opening end. Thereby, the end parts 13 and 23 of the outer tube 10 and the inner tube 20 and the joint flange 30 are integrated. The same process is performed on the other end side to obtain the double tube 1 shown in FIG.

このような第２実施形態によれば、第１実施形態と同様の作用効果が得られる。   According to such 2nd Embodiment, the effect similar to 1st Embodiment is acquired.

第３実施形態
次に図１１〜図１６を参照しつつ第３実施形態を説明する。 Third Embodiment Next, a third embodiment will be described with reference to FIGS.

第３実施形態の二重管は、第２実施形態の二重管１と略同様の構造であるが、継手フランジの構造と、製造工程が第２実施形態と異なる。   The double pipe of the third embodiment has substantially the same structure as the double pipe 1 of the second embodiment, but the structure of the joint flange and the manufacturing process are different from those of the second embodiment.

以下、第３実施形態の二重管の製造工程を説明する。   Hereinafter, the manufacturing process of the double pipe of 3rd Embodiment is demonstrated.

まず、図１１（ａ）に示す直線状の外管１０の長手方向両端側を、図示せぬベンダーなどにより、図１１（ｂ）に示すように所定の曲率で折り曲げる。折り曲げられた角の部分が所定の曲率の湾曲部１２となる。   First, both ends in the longitudinal direction of the linear outer tube 10 shown in FIG. 11A are bent with a predetermined curvature as shown in FIG. The bent corner portion becomes the curved portion 12 having a predetermined curvature.

次に、外管１０の両端側の湾曲部１２に対してそれぞれ、図１１（ｃ）に示すように貫通孔１２ｃを形成する。この貫通孔１２ｃは、外管１０の中央側の本体部１１の長手方向（延在方向）Ｘに沿う。具体的には、上述にした図３または図８に示すように貫通孔１２ｃを成形する。   Next, as shown in FIG. 11C, through holes 12c are formed in the curved portions 12 on both ends of the outer tube 10, respectively. The through hole 12 c extends along the longitudinal direction (extending direction) X of the main body 11 on the center side of the outer tube 10. Specifically, the through hole 12c is formed as shown in FIG. 3 or FIG.

次に、図１１で得た外管１０を、図１２（ａ）に示すようにクランプ８５に固定し、該クランプ８５に設けられた座面８５ａに板状の継手フランジ３０を配置する。このとき、継手フランジ３０の外管保持孔３２の内側に外管１０の端部１３を挿入した状態とする。なお、継手フランジ３０の内管保持孔３３は、図１３に示すように切欠部８７を通じて径方向に向けて開口しており、後で内管保持孔３３に対して径方向から内管２０を挿入できるようになっている。そして、図１２（ｂ）に示すようにパンチ８９で外管１０の端部１３にフランジ部１３ｆを形成する。   Next, the outer tube 10 obtained in FIG. 11 is fixed to the clamp 85 as shown in FIG. 12A, and the plate-like joint flange 30 is disposed on the seating surface 85 a provided on the clamp 85. At this time, the end 13 of the outer tube 10 is inserted inside the outer tube holding hole 32 of the joint flange 30. The inner pipe holding hole 33 of the joint flange 30 opens in the radial direction through the notch 87 as shown in FIG. 13, and the inner pipe 20 is later inserted into the inner pipe holding hole 33 from the radial direction. It can be inserted. Then, as shown in FIG. 12 (b), a flange portion 13 f is formed at the end portion 13 of the outer tube 10 by the punch 89.

ここで図１１、１２で説明した外管１０の加工工程とは別に、図１４（ａ）（ｂ）に示すように、直線状の内管２０の一端側を図示せぬベンダーなどにより、所定の曲率で折り曲げ、さらに図１４（ｂ）（ｃ）に示すように内管の一端側の端部にフランジ部２３ｆを形成しておく。   Here, apart from the processing steps of the outer tube 10 described with reference to FIGS. 11 and 12, as shown in FIGS. 14 (a) and 14 (b), one end side of the linear inner tube 20 is predetermined by a bender not shown. And a flange portion 23f is formed at the end of one end of the inner tube as shown in FIGS. 14 (b) and 14 (c).

次に、図１５（ａ）（ｂ）に示すように、内管２０を、外管１０の両湾曲部１２の貫通孔１２ｃを通じて外管１０に貫通させるとともに、継手フランジ３０の内管保持孔３３に内管２０の端部２３を径方向から挿入して保持させる。なお、図１２の外管１０のフランジ部１３ｆ形成時にフランジ３０と外管１０フランジ部１３ｆとの密着力を抑えておくと、内管２０のフランジ部２３ｆのフランジ３０への組付けが容易になる。必要に応じ組付け後にフランジ３０と外管１０、内管２０の移動防止の加工をすると良い。方法としては、外管１０の端部１３および内管２０の端部２３を拡管してフランジ３０に密着させる方法などがある。
次に、貫通された内管２０のうち、外管１０から突出する直線状の端部２３を、図１５（ｂ）（ｃ）に示すように外管１０の端部２３に沿って折り曲げる。 Next, as shown in FIGS. 15 (a) and 15 (b), the inner tube 20 is passed through the outer tube 10 through the through holes 12 c of both curved portions 12 of the outer tube 10, and the inner tube holding hole of the joint flange 30. An end portion 23 of the inner tube 20 is inserted into the radial direction 33 and held therein. In addition, if the adhesive force between the flange 30 and the outer tube 10 flange portion 13f is suppressed when forming the flange portion 13f of the outer tube 10 in FIG. 12, the assembly of the flange portion 23f of the inner tube 20 to the flange 30 is facilitated. Become. If necessary, after the assembly, the movement of the flange 30, the outer tube 10, and the inner tube 20 may be prevented. As a method, there is a method in which the end portion 13 of the outer tube 10 and the end portion 23 of the inner tube 20 are expanded and brought into close contact with the flange 30.
Next, of the penetrated inner tube 20, the linear end portion 23 protruding from the outer tube 10 is bent along the end portion 23 of the outer tube 10 as shown in FIGS.

次に、第１実施形態で図６を用いて説明した如く、外管１０の貫通孔１２ｃを密閉ろう付けする。   Next, as described with reference to FIG. 6 in the first embodiment, the through hole 12c of the outer tube 10 is hermetically brazed.

次に、第２実施形態で図９を用いて説明した如く、二重管の他端側において、外管１０の端部１３および内管２０の端部２３と継手フランジ３０とを一体化し、これにより図１６に示す二重管１が得られる。   Next, as described with reference to FIG. 9 in the second embodiment, the end portion 13 of the outer tube 10 and the end portion 23 of the inner tube 20 and the joint flange 30 are integrated on the other end side of the double tube, Thereby, the double tube 1 shown in FIG. 16 is obtained.

このような第３実施形態によっても第１実施形態と同様の作用効果が得られる。   Also according to the third embodiment, the same operational effects as those of the first embodiment can be obtained.

なお、外管１０および内管２０の雄型の端部１３、２３には、図１７に示すようにＯリングを保持するための環状の溝部９１を設けておいてもよい。   In addition, you may provide the annular groove part 91 for hold | maintaining an O-ring in the male end parts 13 and 23 of the outer tube | pipe 10 and the inner tube | pipe 20 as shown in FIG.

また、本発明においては、密閉接合の後に、二重管の両端部の間の部位において外管に力を加えて二重管を曲げる工程をさらに含んでもよい。この場合、二重管のレイアウト自由度が向上する利点がある。   Moreover, in this invention, you may further include the process of applying a force to an outer pipe | tube and bending a double pipe | tube in the site | part between the both ends of a double pipe | tube after sealing joining. In this case, there is an advantage that the layout flexibility of the double pipe is improved.

また、本発明の技術的思想の範囲内においてその他の変更をしてもよい。   Further, other changes may be made within the scope of the technical idea of the present invention.

図１は第１実施形態の二重管を示すもので、（ａ）は二重管の断面図、（ｂ）二重管の端部の拡大断面図。1A and 1B show a double tube according to a first embodiment, in which FIG. 1A is a cross-sectional view of the double tube, and FIG. 1B is an enlarged cross-sectional view of an end of the double tube. 第１実施形態の二重管の製造方法における外管の加工工程を示す図であって、（ａ）は曲げる前の外管の側面図、（ｂ）は曲げた後の外管の側面図、（ｃ）は貫通孔成形後の外管の断面図。It is a figure which shows the manufacturing process of the outer tube in the manufacturing method of the double tube of 1st Embodiment, (a) is a side view of the outer tube before bending, (b) is a side view of the outer tube after bending. (C) is sectional drawing of the outer tube | pipe after through-hole shaping | molding. 図２（ｃ）の外管の貫通孔成形工程を詳しく説明する図であって、（ａ）は貫通孔成形前の断面図、（ｂ）は貫通孔成形中の断面図。It is a figure explaining the through-hole shaping | molding process of the outer tube | pipe of FIG.2 (c) in detail, Comprising: (a) is sectional drawing before through-hole shaping | molding, (b) is sectional drawing during through-hole shaping | molding. 第１実施形態の二重管の製造方法における内管の第１の曲げ工程を示す図であって、（ａ）は曲げる前の内管を示す側面図、（ｂ）は曲げた後の内管を示す側面図。It is a figure which shows the 1st bending process of the inner pipe in the manufacturing method of the double pipe of 1st Embodiment, (a) is a side view which shows the inner pipe before bending, (b) is the inner side after bending. The side view which shows a pipe | tube. 第１実施形態の二重管の製造方法における内管の挿入工程を示す図であって、（ａ）は内管の挿入前の断面図、（ｂ）は内管の挿入後の断面図、（ｃ）は内管の挿入後に内管の挿入先端部を曲げた状態の断面図。It is a figure which shows the insertion process of the inner tube in the manufacturing method of the double tube of 1st Embodiment, (a) is sectional drawing before insertion of an inner tube, (b) is sectional drawing after insertion of an inner tube, (C) is sectional drawing of the state which bent the insertion front-end | tip part of the inner pipe after insertion of an inner pipe. 第１実施形態の二重管の製造方法におけるろう付け工程を示す図であって、（ａ）は側面図、（ｂ）は上面図。It is a figure which shows the brazing process in the manufacturing method of the double tube of 1st Embodiment, (a) is a side view, (b) is a top view. 第１実施形態の二重管の製造方法における継手フランジの接続工程を示す図であって、（ａ）は接続前を示す断面図、（ｂ）は接続中を示す断面図。It is a figure which shows the connection process of the joint flange in the manufacturing method of the double tube of 1st Embodiment, Comprising: (a) is sectional drawing which shows before a connection, (b) is sectional drawing which shows during a connection. 図２の貫通孔成形工程の変形例を示す図であって、（ａ）は貫通孔成形前を示す断面図、（ｂ）は貫通孔成形中を示す断面図。It is a figure which shows the modification of the through-hole shaping | molding process of FIG. 2, Comprising: (a) is sectional drawing which shows before through-hole shaping | molding, (b) is sectional drawing which shows during through-hole shaping | molding. 第２実施形態の二重管の製造工程における継手フランジの接続工程を示す図であって、（ａ）は接続前を示す断面図、（ｂ）は接続中を示す断面図。It is a figure which shows the connection process of the joint flange in the manufacturing process of the double pipe of 2nd Embodiment, Comprising: (a) is sectional drawing which shows before a connection, (b) is sectional drawing which shows during a connection. 第２実施形態の二重管を示す断面図。Sectional drawing which shows the double tube of 2nd Embodiment. 第３実施形態の二重管の製造方法における外管の加工工程を示す図であって、（ａ）は曲げる前の外管の側面図、（ｂ）は曲げた後の外管の側面図、（ｃ）は端部にフランジ部を形成した後の外管の側面図。It is a figure which shows the manufacturing process of the outer tube in the manufacturing method of the double tube of 3rd Embodiment, (a) is a side view of the outer tube before bending, (b) is a side view of the outer tube after bending. (C) is a side view of an outer pipe after forming a flange part in an end. 第３実施形態の二重管の製造方法における外管と継手フランジとの接続工程を示す図であって、（ａ）は接続前、（ｂ）は接続中を示す断面図。It is a figure which shows the connection process of the outer pipe and joint flange in the manufacturing method of the double pipe of 3rd Embodiment, Comprising: (a) is before connection, (b) is sectional drawing which shows in connection. 図１２の接続工程を経て得られた外管の端部の構造を示す斜視図。The perspective view which shows the structure of the edge part of the outer tube | pipe obtained through the connection process of FIG. 第３実施形態の二重管の製造方法における内管の加工工程を示す図であって、（ａ）は曲げる前の内管の側面図、（ｂ）は一端部を曲げた後の内管の側面図、（ｃ）は一端部にフランジ部を形成した後の内管の側面図。It is a figure which shows the manufacturing process of the inner pipe in the manufacturing method of the double pipe of 3rd Embodiment, (a) is a side view of the inner pipe before bending, (b) is the inner pipe after bending one end part. (C) is a side view of the inner tube after forming a flange portion at one end. 第３実施形態の二重管の製造方法における内管の挿入工程および内管の曲げ工程を示す図であって、（ａ）は内管の挿入前、（ｂ）は内管の挿入後、（ｃ）は挿入した内管の挿入先端部を曲げた後を示す側面図。It is a figure which shows the insertion process and the bending process of an inner pipe in the manufacturing method of the double pipe of 3rd Embodiment, (a) is before insertion of an inner pipe, (b) is after insertion of an inner pipe, (C) is a side view showing the state after bending the insertion tip of the inserted inner tube. 第３実施形態の二重管を示す斜視図。The perspective view which shows the double tube of 3rd Embodiment. 第３実施形態の二重管の変形例を示す斜視図。The perspective view which shows the modification of the double tube of 3rd Embodiment.

符号の説明Explanation of symbols

１…二重管
１０…外管
１１…本体部
１２…湾曲部
１２ｃ…貫通孔
１３…端部
２０…内管
２１…本体部
２２…湾曲部
２２ｃ…貫通孔
２３…端部 DESCRIPTION OF SYMBOLS 1 ... Double pipe 10 ... Outer tube 11 ... Main-body part 12 ... Curved part 12c ... Through-hole 13 ... End part 20 ... Inner tube 21 ... Main-body part 22 ... Curved part 22c ... Through-hole 23 ... End part

Claims (8)

外管と、前記外管より小径の内管と、を備え、
前記外管は、長手方向中央側の本体部と、前記本体部の長手方向両端側で該本体部から湾曲部を介して折り曲げられた端部と、前記外管のそれぞれの湾曲部に設けられ且つ前記内管を貫通支持する貫通孔と、を備え、
前記両貫通孔を通じて前記内管が前記外管を貫通した状態で、前記内管と前記外管とが密閉接合されていることを特徴とする二重管。 An outer tube, and an inner tube having a smaller diameter than the outer tube,
The outer tube is provided at each of a main body portion on the center side in the longitudinal direction, an end portion bent from the main body portion via a bending portion at both longitudinal ends of the main body portion, and a bending portion of the outer tube. And a through hole for penetrating and supporting the inner tube,
The double pipe, wherein the inner pipe and the outer pipe are hermetically joined in a state in which the inner pipe passes through the outer pipe through the both through holes. 請求項１に記載の二重管であって、
前記二重管の少なくとも一方の端部では、前記内管の端部が前記外管の端部に沿って折り曲げられていることを特徴とする二重管。 The double pipe according to claim 1,
The double pipe is characterized in that at least one end of the double pipe, the end of the inner pipe is bent along the end of the outer pipe. 請求項２に記載の二重管であって、
前記内管の端部と前記外管の端部とに共に固定された板状またはブロック状の継手フランジをさらに備えることを特徴とする二重管。 The double pipe according to claim 2, wherein
A double pipe characterized by further comprising a plate-like or block-like joint flange fixed to the end of the inner pipe and the end of the outer pipe. 二重管の製造方法であって、
外管の両端側を曲げて該両端側に湾曲部を形成する工程と、
前記外管の湾曲部に、貫通孔を形成する工程と、
前記外管の両貫通孔を通じて前記外管に前記内管を貫通させる工程と、
前記外管の両貫通孔と前記内管とを密閉接合する工程と、
を備えることを特徴とする二重管の製造方法。 A method of manufacturing a double pipe,
Bending both ends of the outer tube to form curved portions on both ends;
Forming a through hole in the curved portion of the outer tube;
Passing the inner tube through the outer tube through both through holes of the outer tube;
A step of hermetically bonding both through holes of the outer tube and the inner tube;
A method of manufacturing a double pipe, comprising: 請求項４に記載の二重管の製造方法であって、
前記外管に前記内管を貫通させる工程の前に、前記内管の挿入基端側の端部を折り曲げておく工程をさらに含むことを特徴とする二重管の製造方法。 It is a manufacturing method of the double pipe according to claim 4,
The method of manufacturing a double pipe, further comprising a step of bending an end portion on the insertion base end side of the inner pipe before the step of passing the inner pipe through the outer pipe. 請求項４に記載の二重管の製造方法であって、
前記外管に前記内管を貫通させる工程の前に、前記内管の挿入基端側の端部を折り曲げておく工程をさらに含み、
前記内管を前記外管に貫通させる工程の後に、前記内管の挿入先端側の端部を前記外管の端部に沿って折り曲げる工程をさらに含むことを特徴とする二重管の製造方法。 It is a manufacturing method of the double pipe according to claim 4,
Before the step of passing the inner tube through the outer tube, further comprising the step of bending the end portion of the inner tube on the insertion base end side;
The method of manufacturing a double tube, further comprising a step of bending an end portion of the inner tube on the insertion tip side along the end portion of the outer tube after the step of passing the inner tube through the outer tube. . 請求項５または６に記載の二重管の製造方法であって、
板状またはブロック状の継手フランジを、前記内管の端部と前記外管の端部と共に固定する工程を含むことを特徴とする二重管の製造方法。 It is a manufacturing method of the double pipe according to claim 5 or 6,
A method of manufacturing a double pipe, comprising a step of fixing a plate-like or block-like joint flange together with an end of the inner pipe and an end of the outer pipe. 請求項４〜７の何れか１項に記載の二重管の製造方法であって、
前記密閉接合の後に、二重管の両端部の間の部位において外管に力を加えて二重管を曲げる工程をさらに含むことを特徴とする二重管の製造方法。 A method for producing a double pipe according to any one of claims 4 to 7,
The method for manufacturing a double pipe, further comprising a step of bending the double pipe by applying a force to the outer pipe at a portion between both ends of the double pipe after the hermetic joining.
JP2005188692A 2005-06-28 2005-06-28 Structure of branched part of double pipe and its manufacturing method Pending JP2007009954A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017198411A (en) * 2016-04-28 2017-11-02 株式会社オーツカ Double pipe structure for heat exchanger and its process of manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017198411A (en) * 2016-04-28 2017-11-02 株式会社オーツカ Double pipe structure for heat exchanger and its process of manufacture

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