JP2005214251A - Connecting method for resin pipe - Google Patents

Connecting method for resin pipe Download PDF

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Publication number
JP2005214251A
JP2005214251A JP2004019622A JP2004019622A JP2005214251A JP 2005214251 A JP2005214251 A JP 2005214251A JP 2004019622 A JP2004019622 A JP 2004019622A JP 2004019622 A JP2004019622 A JP 2004019622A JP 2005214251 A JP2005214251 A JP 2005214251A
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Prior art keywords
resin
coil spring
pipe
connection
resin pipe
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Kenichi Mitsui
研一 三井
Nobuaki Funahashi
宣明 舟橋
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Toyoda Gosei Co Ltd
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Toyoda Gosei Co Ltd
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Priority to JP2004019622A priority Critical patent/JP2005214251A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/362—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3632—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising at least a single wire, e.g. in the form of a winding comprising several wires, e.g. in the form of several independent windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91441—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time
    • B29C66/91443—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91951—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to time, e.g. temperature-time diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To positively weld a resin pipe 30 to a connection pipe body 20. <P>SOLUTION: A connection welding body 40A with a compressed coil spring 41 is attached to an outer circumference part of the connection pipe body 20, and then, the resin pipe 30 is pressed in. An induction heating device IH is placed in a position separated a predetermined distance from the coil spring 41, and by driving the induction heating device IH, an induced current is sent through the coil spring 41 to heat the coil spring 41. The heated coil spring 41 extends from the compressed state while melting peripheral resin, and its temperature drops. When the melted resin solidifies, the resin pipe 30 is welded to the connection pipe body 20, and it is connected with high sealing performance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、樹脂パイプをコネクタに接続する樹脂パイプの接続方法に関する。   The present invention relates to a resin pipe connection method for connecting a resin pipe to a connector.

従来、樹脂パイプをコネクタ（接続管体）に締結するには、コネクタのニップル部に設けたリング状突部に樹脂パイプを圧入する手段が一般的である。上記手段によると、樹脂パイプをコネクタに圧入しているだけであるから、抜けやすいので、これを固定する技術として、例えば、特許文献１，２の技術が知られている。この技術は、コネクタの外周面と樹脂パイプの内周面との間に磁性材を介在させて、樹脂パイプの外側に配置した電磁コイルを駆動する。これにより、磁性材に誘導電流が流れ、これに伴う熱により磁性材の周辺の樹脂材料を溶融し、冷却固化させて、樹脂パイプをコネクタに溶着している。   Conventionally, in order to fasten a resin pipe to a connector (connection pipe body), a means for press-fitting the resin pipe into a ring-shaped protrusion provided in a nipple portion of the connector is generally used. According to the above means, since the resin pipe is only press-fitted into the connector, it is easy to come off, and as a technique for fixing this, for example, techniques of Patent Documents 1 and 2 are known. In this technique, a magnetic material is interposed between the outer peripheral surface of the connector and the inner peripheral surface of the resin pipe, and an electromagnetic coil disposed outside the resin pipe is driven. As a result, an induced current flows through the magnetic material, and the resin material around the magnetic material is melted and cooled and solidified by the accompanying heat, and the resin pipe is welded to the connector.

しかし、電磁コイルの誘導加熱によって磁性材から発生する熱が所望の範囲に設定することが難しい。このため、樹脂材料がその分解温度を超えたり、十分に溶融する温度を超えなかったりして、溶着が不確実になるという問題があった。   However, it is difficult to set the heat generated from the magnetic material by the induction heating of the electromagnetic coil in a desired range. For this reason, there has been a problem that welding is uncertain because the resin material exceeds its decomposition temperature or does not exceed the temperature at which it sufficiently melts.

実開平５−４２８８９号公報Japanese Utility Model Publication No. 5-42889 特開平９−２９０４６１号公報JP-A-9-290461

本発明は、上記従来の技術を解決するためになされたものであり、接続管体に樹脂パイプを確実に溶着接続することができる樹脂パイプの接続方法を提供することを目的とする。   The present invention has been made to solve the above-described conventional technique, and an object of the present invention is to provide a resin pipe connection method capable of reliably welding and connecting a resin pipe to a connection pipe body.

上記課題を解決するためになされた本発明は、
樹脂から形成された接続管体に樹脂パイプを圧入するとともに両者を溶着一体化する樹脂パイプの接続方法において、
上記接続管体と上記樹脂パイプとの間に、コイルスプリングを圧縮した状態で介在させる工程と、
上記コイルスプリングと所定間隙離れて設置した誘導加熱装置による電磁誘導により上記コイルスプリングに誘導電流を流し、該コイルスプリングから生じる熱で周辺の樹脂を溶融しつつ該コイルスプリングを上記圧縮状態から伸張させ、該溶融した樹脂を固化させることで上記樹脂パイプを上記接続管体に一体化する工程と、
を備えたことを特徴とする。 The present invention made to solve the above problems
In a resin pipe connection method in which a resin pipe is press-fitted into a connecting tube formed from resin and both are fused and integrated,
A step of interposing a coil spring in a compressed state between the connection pipe body and the resin pipe;
An induction current is caused to flow through the coil spring by electromagnetic induction by an induction heating device installed at a predetermined gap from the coil spring, and the coil spring is expanded from the compressed state while the surrounding resin is melted by the heat generated from the coil spring. A step of integrating the resin pipe into the connecting pipe body by solidifying the molten resin;
It is provided with.

本発明にかかる樹脂パイプの接続方法において、接続管体に樹脂パイプを溶着一体化するには、まず、接続管体と樹脂パイプとの間に、コイルスプリングを圧縮した状態で介在させた状態でセットする。この状態にて、コイルスプリングと所定距離離れた位置に設置された誘導加熱装置を駆動して、コイルスプリングに誘導電流を流す。コイルスプリングは、誘導電流により温度が上昇して周辺の樹脂材料を溶融する。これにより、コイルスプリングに圧縮力を加えている樹脂部材も溶融されるから、コイルスプリングが伸張する。コイルスプリングの伸張により誘導電流が低減して発熱量が抑制される。そして、溶融した樹脂材料は、接続管体と樹脂パイプとの間で冷却固化して、両者を溶着する。コイルスプリングは、その誘導加熱により周囲の樹脂を溶かすと伸張して誘導電流量を低減して発熱量を抑制するから、従来の技術で説明したようなフィードバック制御を用いることなく、自律的な温度制御を行なう。よって、過熱による樹脂焼けや電流の低すぎることによる溶着不良が生じることもない。   In the resin pipe connection method according to the present invention, in order to weld and integrate the resin pipe to the connection pipe body, first, in a state where the coil spring is interposed in a compressed state between the connection pipe body and the resin pipe. set. In this state, an induction heating device installed at a position away from the coil spring by a predetermined distance is driven to cause an induction current to flow through the coil spring. The coil spring is heated by an induced current and melts the surrounding resin material. As a result, the resin member that applies a compressive force to the coil spring is also melted, so that the coil spring expands. The induction current is reduced by the extension of the coil spring, and the amount of heat generation is suppressed. Then, the molten resin material is cooled and solidified between the connecting pipe body and the resin pipe, and both are welded. The coil spring expands when the surrounding resin is melted by induction heating and reduces the amount of induction current to suppress the amount of heat generation. Take control. Therefore, there is no occurrence of defective welding due to overheating of the resin due to overheating or too low current.

本発明の好適な態様として、管本体と該管本体の外周部から突設されたリング状突部とから接続管体を構成し、上記コイルスプリングを、上記接続管体に装着する前に、上記接続管体および樹脂パイプと溶着可能な樹脂材料から形成された環状支持体により圧縮状態で保持し、該環状支持体を、上記リング状突部を乗り越えるように拡径可能に形成することができる。この接続溶着体は、コイルスプリングを圧縮状態に支持するとともに接続管体のリング状突部を乗り越えることを容易にし、しかも、溶着する樹脂材料として利用することができる。   As a preferred aspect of the present invention, a connecting tube is constituted by a tube main body and a ring-shaped protrusion protruding from the outer periphery of the tube main body, and before the coil spring is attached to the connecting tube, It is held in a compressed state by an annular support formed from a resin material that can be welded to the connecting pipe and the resin pipe, and the annular support can be formed to be able to expand the diameter so as to get over the ring-shaped protrusion. it can. This connection welded body can support the coil spring in a compressed state and can easily get over the ring-shaped protrusion of the connection pipe body, and can be used as a resin material to be welded.

（１） 接続構造体の概略構成
図１は本発明の一実施例にかかる接続管体に樹脂パイプを接続している接続構造体を示す断面図である。本実施例にかかる接続構造体は、例えば、燃料電池の水素を流すために高い気密性を必要とする樹脂パイプを接続管体に接続する構成に好適に用いることができる。図１において、接続構造体は、接続管体２０に樹脂パイプ３０が圧入され、接続管体２０と樹脂パイプ３０とを溶着する溶着接合部４０により接続されている。 (1) Schematic Configuration of Connection Structure FIG. 1 is a cross-sectional view showing a connection structure in which a resin pipe is connected to a connection tube according to an embodiment of the present invention. The connection structure according to the present embodiment can be suitably used for, for example, a configuration in which a resin pipe that requires high airtightness for flowing hydrogen of a fuel cell is connected to the connection pipe body. In FIG. 1, the connection structure is connected by a welded joint 40 in which a resin pipe 30 is press-fitted into the connection tube 20 and the connection tube 20 and the resin pipe 30 are welded.

接続管体２０は、ガラス強化繊維入りのポリアミド（６−６ナイロン）を樹脂材料として射出成形された管体であり、管流路２１ａを有する円筒状の管本体２１と、管本体２１の外周に突設されたリング状突部２２，２３，２４とを備えている。   The connecting pipe body 20 is a pipe body that is injection-molded using a polyamide (6-6 nylon) containing glass reinforcing fibers as a resin material, and a cylindrical pipe body 21 having a pipe flow path 21 a and an outer periphery of the pipe body 21. And ring-shaped protrusions 22, 23, and 24 that are provided at the protrusions.

図２は図１の要部を拡大して示す断面図である。図２において、リング状突部２２，２３，２４は、管本体２１の外周に３列にわたって形成されている。リング状突部２２，２３，２４は、先端側から後端側へ向かうほど外径が拡大する円錐台表面２２ａ，２３ａ，２４ａと、円錐台表面２２ａ，２３ａ，２４ａの最大外径から一般部に伸びかつ上記円錐台表面２２ａ，２３ａ，２４ａと鋭角に交差する鋭角表面２２ｂ，２３ｂ，２４ｂとを有し、これらからそれぞれ山脈状で断面直角三角形を形成している。このリング状突部２２，２３，２４は、円錐台表面２２ａと鋭角表面２２ｂ，２３ｂ，２４ｂとの間の頂角が鋭角に形成されているので、樹脂パイプ３０に引張りの力が作用したときに、大きな引き抜き抵抗力を生じる。   FIG. 2 is an enlarged cross-sectional view showing a main part of FIG. In FIG. 2, the ring-shaped protrusions 22, 23, 24 are formed on the outer periphery of the pipe body 21 over three rows. The ring-shaped protrusions 22, 23, and 24 are general portions from the frustoconical surfaces 22a, 23a, and 24a whose outer diameters increase from the front end side toward the rear end side and the maximum outer diameters of the frustoconical surfaces 22a, 23a, and 24a The frustoconical surfaces 22a, 23a, 24a and acute angle surfaces 22b, 23b, 24b intersecting with the acute angle, respectively, form a mountain-shaped right-angled triangle from these. The ring-shaped protrusions 22, 23, 24 are formed with an acute angle between the frustoconical surface 22a and the acute angle surfaces 22b, 23b, 24b. Therefore, when a tensile force acts on the resin pipe 30 In addition, a large pulling resistance is generated.

樹脂パイプ３０は、３層から形成されており、内層３１と、バリア層３２と、外層３３とを積層することにより構成されている。３層の樹脂材料は、水素ホースの場合には、以下の構成をとることができる。内層３１は、耐水性に優れた樹脂材料、例えば、ポリエチレン、ポリプロピレン、オレフィン系熱可塑性エラストマー、フッ素系樹脂、スチロール系樹脂のいずれかを適用することができる。バリア層３２は、耐水素透過性に優れたポリエチレンビニルアルコール（ＥＶＯＨ）を適用することができる。外層３３は、含水特性に富んだ樹脂材料、例えば、耐熱性に優れたポリアミド樹脂（ナイロン）、フッ素系樹脂、スチロール系樹脂などを用いることができる。
樹脂パイプ３０は、内層３１、中間層および外層３３を同時押出する方法、内層３１から順次積層する方法、中間層を形成した後に内層３１または外層３３をコーティングする方法により製造することができる。 The resin pipe 30 is formed of three layers, and is configured by laminating an inner layer 31, a barrier layer 32, and an outer layer 33. In the case of a hydrogen hose, the three-layer resin material can have the following configuration. The inner layer 31 may be made of a resin material having excellent water resistance, such as polyethylene, polypropylene, olefin-based thermoplastic elastomer, fluorine-based resin, or styrene-based resin. For the barrier layer 32, polyethylene vinyl alcohol (EVOH) having excellent hydrogen permeation resistance can be applied. For the outer layer 33, a resin material rich in water-containing characteristics, for example, a polyamide resin (nylon), a fluorine resin, a styrene resin, or the like excellent in heat resistance can be used.
The resin pipe 30 can be manufactured by a method of simultaneously extruding the inner layer 31, the intermediate layer and the outer layer 33, a method of sequentially laminating from the inner layer 31, and a method of coating the inner layer 31 or the outer layer 33 after forming the intermediate layer.

溶着接合部４０は、コイルスプリング４１と、溶着部４２とを備えており、溶着部４２がコイルスプリング４１の誘導加熱により溶融されることにより接続管体２０と樹脂パイプ３０とを溶着している。つまり、溶着部４２は、コイルスプリング４１を埋設するとともに接続管体２０と樹脂パイプ３０との間に介在している。溶着部４２の樹脂材料としては、接続管体２０と樹脂パイプ３０の内層３１の両方に熱溶着する材料であり、例えば、ポリアミドを用いることができる。   The welded joint 40 includes a coil spring 41 and a welded portion 42, and the welded portion 42 is melted by induction heating of the coil spring 41 to weld the connecting tube 20 and the resin pipe 30. . That is, the welded portion 42 embeds the coil spring 41 and is interposed between the connecting tube body 20 and the resin pipe 30. As a resin material of the welding part 42, it is a material heat-welded to both the connection pipe body 20 and the inner layer 31 of the resin pipe 30, for example, polyamide can be used.

（２） 溶着工程
（２）−１ 接続溶着体４０Ａ
図３は接続溶着体４０Ａを説明するための斜視図である。図３において、接続溶着体４０Ａは、溶着接合部４０（図２）を形成するためのものであり、コイルスプリング４１と、コイルスプリング４１を圧縮状体で支持する環状支持体４２Ａとを備えている。環状支持体４２Ａは、コイルスプリング４１を圧縮状態で支持する収納凹所４２Ａａを有する断面コ字形であり、その一部がスリット４２Ａｂになっており、スリット４２Ａｂの間隔を広げることによりコイルスプリング４１を拡径可能にしている。環状支持体４２Ａは、後述する接続工程を経ると溶着部４２を形成するものである。 (2) Welding step (2) -1 Connection welded body 40A
FIG. 3 is a perspective view for explaining the connection welded body 40A. In FIG. 3, a connection welded body 40A is for forming the welded joint 40 (FIG. 2), and includes a coil spring 41 and an annular support 42A that supports the coil spring 41 with a compressed body. Yes. The annular support 42A has a U-shaped cross section having a housing recess 42Aa that supports the coil spring 41 in a compressed state, and a part of the annular support 42A is a slit 42Ab, and the coil spring 41 is expanded by increasing the interval between the slits 42Ab. The diameter can be expanded. The annular support 42 </ b> A forms the welded portion 42 after a connection process described later.

（２）−２ 接続工程
図４は接続管体２０に樹脂パイプ３０を接続する工程を説明する説明図である。まず、接続溶着体４０Ａを拡径して接続管体２０の外周部にセットする。すなわち、スリット４２Ａｂの間隔を広げつつ、コイルスプリング４１を伸ばす。この状態で、接続溶着体４０Ａを接続管体２０のリング状突部２２，２３を乗り越えさせて、リング状突部２３，２４との間に装着する。同様にして、他の接続溶着体４０Ａをリング状突部２２とリング状突部２３との間に装着する。その後、接続管体２０の外周部に、接続溶着体４０Ａを覆うように樹脂パイプ３０を圧入する。 (2) -2 Connection Step FIG. 4 is an explanatory view illustrating a step of connecting the resin pipe 30 to the connection pipe body 20. First, the diameter of the connection welded body 40 </ b> A is expanded and set on the outer peripheral portion of the connection pipe body 20. That is, the coil spring 41 is extended while increasing the interval between the slits 42Ab. In this state, the connection welded body 40 </ b> A is mounted over the ring-shaped protrusions 23 and 24 by getting over the ring-shaped protrusions 22 and 23 of the connection tube 20. Similarly, another connection welded body 40 </ b> A is mounted between the ring-shaped protrusion 22 and the ring-shaped protrusion 23. Thereafter, the resin pipe 30 is press-fitted into the outer peripheral portion of the connection tube body 20 so as to cover the connection welded body 40A.

続いて、図５に示すように、接続管体２０に樹脂パイプ３０を圧入した接続体を誘導加熱装置ＩＨにセットし、誘導加熱装置ＩＨを駆動することにより接続溶着体４０Ａのコイルスプリング４１に誘導電流を流す。つまり、コイルスプリング４１は、圧縮状態で密着して閉回路を形成しているから誘導電流が流れる。コイルスプリング４１に流れる誘導電流により温度が上昇して周辺の樹脂材料、つまり樹脂パイプ３０の内層３１の表面、接続管体２０の外表面および環状支持体４２Ａを溶融する。環状支持体４２Ａの溶融により、圧縮されているコイルスプリング４１の圧縮力を釈放し、コイルスプリング４１が伸張する。コイルスプリング４１の伸張により、該コイルスプリング４１の末端が接続されていない開回路となるから、誘導電流が低減して発熱量が抑制される。そして、溶融した樹脂材料は、接続管体２０の外周部と樹脂パイプ３０との間で冷却固化して両者を溶着する。   Subsequently, as shown in FIG. 5, the connection body in which the resin pipe 30 is press-fitted into the connection tube body 20 is set in the induction heating device IH, and the induction heating device IH is driven so that the coil spring 41 of the connection welded body 40A is driven. Apply induced current. That is, since the coil spring 41 is in close contact in a compressed state to form a closed circuit, an induced current flows. The temperature rises due to the induced current flowing through the coil spring 41, and the surrounding resin material, that is, the surface of the inner layer 31 of the resin pipe 30, the outer surface of the connecting pipe body 20, and the annular support 42A are melted. As the annular support 42A is melted, the compression force of the compressed coil spring 41 is released, and the coil spring 41 expands. The extension of the coil spring 41 results in an open circuit in which the end of the coil spring 41 is not connected, so that the induced current is reduced and the amount of heat generation is suppressed. Then, the molten resin material is cooled and solidified between the outer peripheral portion of the connecting pipe body 20 and the resin pipe 30 to weld them together.

（３） 上記実施例の構成により、上述した効果のほか、以下の効果を奏する。
（３）−１ 図６は誘導加熱装置による接続過程を説明する説明図である。図６は縦軸にコイルスプリング４１の温度、横軸に時間を示す。図６に示すように、誘導加熱装置ＩＨの駆動によりコイルスプリング４１に誘導電流が流れると（時点Ｔ１）、コイルスプリング４１の温度が上昇する。コイルスプリング４１の温度上昇により、環状支持体４２Ａの樹脂材料がその融点を超えると（時点Ｔ２）、環状支持体４２Ａが溶融して、コイルスプリング４１が圧縮状態から開放されて徐々に伸張する。これにより、コイルスプリング４１は、断面積の大きい閉回路から、両端を開放した開回路に移行し、誘導電流量が減少する。そして、誘導電流の減少によりコイルスプリング４１の発熱量が低減すると、周辺の樹脂材料を過熱しすぎることがない。したがって、接続溶着体４０Ａは、自律的な温度制御を行なうから、フィードバック制御を用いることなく、初期による加熱により十分な融着が行われ、その後、加熱が減少するから、樹脂焼けが生じることもない。
なお、上述した誘導加熱を好適に行なうためには、誘導加熱装置ＩＨの出力、溶融する環状支持体４２Ａの樹脂量やコイルスプリング４１の巻き数、線径などを考慮する。 (3) In addition to the effects described above, the following effects are achieved by the configuration of the above embodiment.
(3) -1 FIG. 6 is an explanatory view for explaining the connection process by the induction heating device. FIG. 6 shows the temperature of the coil spring 41 on the vertical axis and the time on the horizontal axis. As shown in FIG. 6, when an induction current flows through the coil spring 41 by driving the induction heating device IH (time point T1), the temperature of the coil spring 41 rises. When the resin material of the annular support 42A exceeds its melting point due to the temperature rise of the coil spring 41 (time T2), the annular support 42A is melted and the coil spring 41 is released from the compressed state and gradually expands. As a result, the coil spring 41 shifts from a closed circuit with a large cross-sectional area to an open circuit with both ends open, and the amount of induced current decreases. When the amount of heat generated by the coil spring 41 is reduced due to the reduction of the induced current, the surrounding resin material is not overheated. Therefore, since the connection welded body 40A performs autonomous temperature control, sufficient fusion is performed by heating in the initial stage without using feedback control, and then the heating is reduced, so that the resin burn may occur. Absent.
In order to suitably perform the above-described induction heating, the output of the induction heating device IH, the resin amount of the annular support 42A to be melted, the number of turns of the coil spring 41, the wire diameter, and the like are taken into consideration.

（３）−２ 樹脂パイプ３０は、接続管体２０のリング状突部２２，２３，２４で拡径された状態で圧入されるとともに、接続管体２０の表面に樹脂により融着接合されているから、水素のような高いシール性を必要とする接続箇所に好適である。 (3) -2 The resin pipe 30 is press-fitted in a state where the diameter is expanded by the ring-shaped protrusions 22, 23, and 24 of the connection pipe body 20, and is fusion-bonded to the surface of the connection pipe body 20 with resin. Therefore, it is suitable for a connecting portion that requires high sealing properties such as hydrogen.

なお、この発明は上記実施例に限られるものではなく、その要旨を逸脱しない範囲において種々の態様において実施することが可能であり、例えば次のような変形も可能である。   The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

図７は他の実施例にかかる樹脂パイプの接続構造体を示す断面図である。他の実施例は、接続管体のリング状突部をなくし、接続管体２０Ｂの先端部にテーパ２２Ｂを形成している。また、接続管体２０Ｂの外周に環状凹所２３Ｂａを形成し、この環状凹所２３Ｂａにコイルスプリング４１Ｂを収納するとともに、支持体４０Ｂによりコイルスプリング４１Ｂを止めている。この構成によると、テーパ２２Ｂにより挿入先端部が細くなっているから、コイルスプリング４１Ｂを挿入する作業が容易である。また、支持体４０Ｂは、環状凹所２３Ｂａに嵌合させればよいから、位置決めも容易である。   FIG. 7 is a sectional view showing a resin pipe connection structure according to another embodiment. In another embodiment, the ring-shaped protrusion of the connecting tube is eliminated, and a taper 22B is formed at the tip of the connecting tube 20B. Further, an annular recess 23Ba is formed on the outer periphery of the connecting tube body 20B, and the coil spring 41B is accommodated in the annular recess 23Ba, and the coil spring 41B is stopped by the support body 40B. According to this configuration, since the insertion tip is narrowed by the taper 22B, the operation of inserting the coil spring 41B is easy. Moreover, since the support body 40B should just be fitted to annular recess 23Ba, positioning is also easy.

なお、この発明は上記実施例に限られるものではなく、その要旨を逸脱しない範囲において種々の態様において実施することが可能であり、例えば次のような変形も可能である。   The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

接続管体と樹脂パイプとを溶着するための環状支持体は、コイルスプリングを樹脂材料により埋設した環状体を射出成形により形成してもよく、また、コイルスプリングを樹脂の紐で締結する構成であってもよい。   The annular support for welding the connecting pipe body and the resin pipe may be formed by injection molding of an annular body in which a coil spring is embedded with a resin material, and the coil spring is fastened with a resin string. There may be.

本発明の一実施例にかかる接続管体に樹脂パイプを接続している接続構造体を示す半断面図である。It is a half sectional view showing the connection structure which has connected the resin pipe to the connection pipe concerning one example of the present invention. 図１の要部を拡大して示す断面図である。It is sectional drawing which expands and shows the principal part of FIG. 接続溶着体を説明するための斜視図である。It is a perspective view for demonstrating a connection welding body. 接続管体に樹脂パイプを接続する工程を説明する説明図である。It is explanatory drawing explaining the process of connecting a resin pipe to a connection pipe body. 図４に続く工程を説明する説明図である。It is explanatory drawing explaining the process of following FIG. 誘導加熱装置による接続過程を説明する説明図である。It is explanatory drawing explaining the connection process by an induction heating apparatus. 他の実施例にかかる樹脂パイプの接続構造体を示す断面図である。It is sectional drawing which shows the connection structure of the resin pipe concerning another Example.

符号の説明Explanation of symbols

２０...接続管体
２０Ｂ...接続管体
２１...管本体
２１ａ...管流路
２２，２３，２４...リング状突部
２２ａ，２３ａ，２４ａ...円錐台表面
２２ｂ，２３ｂ，２４ｂ...鋭角表面
２２Ｂ...テーパ部
２１Ｂａ...環状凹所
３０...樹脂パイプ
３１...内層
３２...バリア層
３３...外層
４０...溶着接合部
４０Ａ...接続溶着体
４０Ｂ...支持体
４１...コイルスプリング
４１Ｂ...コイルスプリング
４２...溶着部
４２Ａ...環状支持体
４２Ａａ...収納凹所
４２Ａｂ...スリット
ＩＨ...誘導加熱装置 20 ... Connection pipe body 20B ... Connection pipe body 21 ... Pipe body 21a ... Pipe flow path 22, 23, 24 ... Ring-shaped projections 22a, 23a, 24a ... Frustum surface 22b, 23b, 24b ... acute angle surface 22B ... taper part 21Ba ... annular recess 30 ... resin pipe 31 ... inner layer 32 ... barrier layer 33 ... outer layer 40 ... welding Joint 40A ... Connection weld 40B ... Support 41 ... Coil spring 41B ... Coil spring 42 ... Weld 42A ... Ring support 42Aa ... Storage recess 42Ab .. .Slit IH ... Induction heating device

Claims (2)

樹脂から形成された接続管体に樹脂パイプを圧入するとともに両者を溶着一体化する樹脂パイプの接続方法において、
上記接続管体と上記樹脂パイプとの間に、コイルスプリングを圧縮した状態で介在させる工程と、
上記コイルスプリングと所定間隙離れて設置した誘導加熱装置による電磁誘導により上記コイルスプリングに誘導電流を流し、該コイルスプリングから生じる熱で周辺の樹脂を溶融しつつ該コイルスプリングを上記圧縮状態から伸張させ、該溶融した樹脂を固化させることで上記樹脂パイプを上記接続管体に一体化する工程と、
を備えたことを特徴とする樹脂パイプの接続方法。 In a resin pipe connection method in which a resin pipe is press-fitted into a connecting tube formed from resin and both are fused and integrated,
A step of interposing a coil spring in a compressed state between the connection pipe body and the resin pipe;
An induction current is caused to flow through the coil spring by electromagnetic induction by an induction heating device installed at a predetermined gap from the coil spring, and the coil spring is expanded from the compressed state while the surrounding resin is melted by the heat generated from the coil spring. A step of integrating the resin pipe into the connecting pipe body by solidifying the molten resin;
A method for connecting a resin pipe, comprising: 請求項１に記載の樹脂パイプの接続方法において、
上記接続管体は、管本体と、該管本体の外周部から突設されたリング状突部とを備え、
上記コイルスプリングは、上記接続管体に装着する前に、上記接続管体および樹脂パイプと溶着可能な樹脂材料から形成された環状支持体により圧縮状態で保持されており、該環状支持体は、上記リング状突部を乗り越えるように拡径可能に形成されている樹脂パイプの接続方法。 In the connection method of the resin pipe of Claim 1,
The connecting pipe includes a pipe main body and a ring-shaped protrusion protruding from the outer periphery of the pipe main body,
The coil spring is held in a compressed state by an annular support formed of a resin material that can be welded to the connection pipe and the resin pipe before being attached to the connection pipe. A method for connecting resin pipes formed so as to be able to expand the diameter so as to get over the ring-shaped protrusion.
JP2004019622A 2004-01-28 2004-01-28 Connecting method for resin pipe Pending JP2005214251A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2463080A3 (en) * 2010-12-13 2012-12-12 Friatec Aktiengesellschaft Heating element, method for welding tubular plastic components with a heating element and system comprising tubular components and heating element
EP2559547A1 (en) * 2011-08-19 2013-02-20 Friatec Aktiengesellschaft Mounting system to weld plastic tubular components
KR20160023757A (en) * 2012-09-18 2016-03-03 가부시키가이샤 니프코 curved tube
WO2020022178A1 (en) * 2018-07-23 2020-01-30 株式会社アクシス Joint device, joint structure, and method for manufacturing joint structure

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2463080A3 (en) * 2010-12-13 2012-12-12 Friatec Aktiengesellschaft Heating element, method for welding tubular plastic components with a heating element and system comprising tubular components and heating element
EP2559547A1 (en) * 2011-08-19 2013-02-20 Friatec Aktiengesellschaft Mounting system to weld plastic tubular components
KR20160023757A (en) * 2012-09-18 2016-03-03 가부시키가이샤 니프코 curved tube
KR101713477B1 (en) * 2012-09-18 2017-03-07 가부시키가이샤 니프코 curved tube
US10253913B2 (en) 2012-09-18 2019-04-09 Nifco Inc. Curved tube structure and die for forming curved tube
WO2020022178A1 (en) * 2018-07-23 2020-01-30 株式会社アクシス Joint device, joint structure, and method for manufacturing joint structure
JPWO2020022178A1 (en) * 2018-07-23 2021-08-02 株式会社アクシス Joint device, joint structure and manufacturing method of joint structure
JP7240752B2 (en) 2018-07-23 2023-03-16 株式会社アクシス Coupling device, joint structure, and joint structure manufacturing method

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