JP3722249B2 - Method and apparatus for connecting resin pipes - Google Patents

Method and apparatus for connecting resin pipes Download PDF

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Publication number
JP3722249B2
JP3722249B2 JP30099596A JP30099596A JP3722249B2 JP 3722249 B2 JP3722249 B2 JP 3722249B2 JP 30099596 A JP30099596 A JP 30099596A JP 30099596 A JP30099596 A JP 30099596A JP 3722249 B2 JP3722249 B2 JP 3722249B2
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Japan
Prior art keywords
tube
cooling water
resin
induction heating
outer peripheral
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JP30099596A
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JPH10128853A (en
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力 宮崎
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株式会社ミヤデン
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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
    • B29C65/3608—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 single particles, e.g. fillers or discontinuous fibre-reinforcements
    • B29C65/3612—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 single particles, e.g. fillers or discontinuous fibre-reinforcements comprising fillers
    • 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
    • B29C66/01—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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81455—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • 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
    • B29C65/3672—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 composition of the elements heated by induction which remain in the joint
    • B29C65/3684—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 composition of the elements heated by induction which remain in the joint being non-metallic
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52294—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being heated

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for joining a resinmade pipe by a method wherein joining can be surely carried out by melting the resin-made pipe itself, and a joined state can be stably obtained for a long period. SOLUTION: In a method for joining a resin-made pipe wherein end parts 2a, 3a of at least two resin-made pipes 2, 3 are joined to each other, a step wherein an exothermic component 8 generating heat by induction heating is set on an inner face of a joint part of the resin-made pipes 2, 3, a step wherein the joint part of both pipes is melted by induction heating the exothermic component 8 with a heating coil 4 which is connected to an induction heater arranged on an outer peripheral side of the joint part and can be radially elongated and shrinked, and a step wherein cooling water W is supplied into a tube 13 to enlarge an outer diameter of a tube 12 with the pressure, and the tube 12 is made to abut against outer peripheral faces of the resin-made pipes 2, 3 are provided. Pressure of the cooling water W supplied to the tube 12 is so set as to be variable, for instance, according to induction heating time.

Description

【０００１】
【産業上の利用分野】
本発明は、例えば配管時に使用される樹脂製パイプの接続方法及びその接続装置に関する。
【０００２】
【従来の技術】
従来、例えば水や各種溶液の配管、電気配線時の配管に使用される塩化ビニールパイプ（以下樹脂製パイプという）は、所定の長さに設定されているため、配管場所の状況に応じて継手等を使用して接続する必要がある。この接続は一般的に、接続しようとする樹脂製パイプの端面外周面に所定の接着剤を塗布し、この塗布部分を継手の中に嵌合させたり、あるいは一方の樹脂製パイプの端部を暖めて径を大きくして、接着剤が塗布された他方の樹脂製パイプの塗布部分を嵌合し、所定時間放置することによる接着剤の硬化によって接続している。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記の接続方法にあっては、樹脂製パイプの接続部分の耐久性が劣り、長期に亘って安定した接続状態が得られ難いという問題点があった。すなわち、樹脂製パイプの接続部分は接着剤を介して接続されているのみであるため、接着剤の塗布状態が均一でないと、接着部分に僅かな間隙ができて水漏れ等の原因になり易い。また、接着剤の塗布状態によっては、接着剤の耐久性が樹脂製パイプの耐久性より劣る場合があり、この場合は、長年の使用により、接続部分の接着剤が成分的に破壊し接続部分に間隙が生じる等、安定した接続状態を得ることが困難になる。
【０００４】
その結果、例えば配管自体が一般住宅の床面下や高層ビルの壁面内部に配設されている場合、あるいは道路のコンクリート（アスファルト）中に埋設している場合等に、上記のような間隙によって水漏れ等が生じると、水漏れ部分を探す作業と、その修理作業が場所的に非常に困難になり、修理に莫大な費用がかかることになる。
【０００５】
本発明は、上記の事情に鑑みてなされたもので、その目的は、樹脂製パイプ自体を溶融させることにより接続を確実に行うことができ、長期に亘って安定して接続状態が得られる樹脂製パイプの接続方法及びその接続装置を提供することにある。
【０００６】
【課題を解決するための手段】
かかる目的を達成すべく、請求項１記載の発明は、少なくとも２本の樹脂製パイプの端部を接続する樹脂製パイプの接続方法において、前記樹脂製パイプの接続部分内面に誘導加熱により発熱する発熱部材を配設するステップと、接続部分の外周面側に配設され誘導加熱装置に接続されると共に、径方向に伸縮可能なチューブで覆われた加熱コイルで前記発熱部材を誘導加熱し両パイプの接続部分を溶融させるステップと、前記チューブ内に冷却水を供給してその圧力でチューブの外径を拡げ接続部分の樹脂製パイプの外周面に当接させるステップと、を具備することを特徴とする。
【０００７】
このように形成することにより、誘導加熱時に加熱コイルのチューブ内に所定圧力の冷却水が供給され、この冷却水の圧力でチューブの外径が拡がり、樹脂製パイプの接続部分が外側から押さえ付けられる。樹脂製パイプの接続部分は、発熱部材の発熱によって柔軟となり、内部温度等により外側に広がろうとするが、この拡がりが加熱コイルのチューブの押さえ付けで規制され、接続後に接続部分の外径に大きな変化が生じることがなく、かつ外周面側からの押さえ付けにより両樹脂製パイプの接続部分が確実に溶融接続される。
【０００８】
また、請求項２記載の発明は、チューブに供給される冷却水の圧力が、誘導加熱時間に応じて可変され得ることを特徴とする、このように形成することにより、発熱程度が高くなる所定時間の加熱後に、冷却水の圧力を高くして樹脂製パイプの拡がりをチューブによって確実に抑えることができる。
【０００９】
また、請求項３記載の発明は、所定長さの樹脂製パイプの接続部分に配設され誘導加熱により発熱する発熱部材と、前記接続部分の外周面側に配設されて誘導加熱装置に接続されると共に径方向に伸縮可能なチューブで覆われた加熱コイルと、該加熱コイル内に冷却水を供給して前記チューブの外径を拡げて接続部分の樹脂製パイプの外周面に当接させる冷却水供給装置と、を具備することを特徴とする。
【００１０】
このように形成することにより、加熱コイル内に冷却水を供給して加熱コイルの発熱を抑えつつ、発熱部材を発熱させ、この発熱を利用して両樹脂製パイプの接続部分が溶融接続される。また、加熱コイルのチューブ内に供給される冷却水により、加熱コイル自体が冷却されて加熱効率が向上すると共に、チューブの外径が拡がることにより、樹脂製パイプの接続部分の拡がりが防止されつつ内側に押し付けられ、良好な接着状態が得られる。
【００１１】
また、請求項４記載の発明は、所定長さの樹脂製パイプの接続部分に配設され誘導加熱により発熱する発熱部材と、接続部分の外周面側に配設され、その銅パイプの外周面が所定の間隙で径方向に伸縮可能なチューブで覆われた加熱コイルに電流を供給する誘導加熱装置と、加熱コイルの銅パイプ内及びチューブ内に冷却水を供給する冷却水供給装置と、誘導加熱装置及び冷却水供給装置を制御する制御装置と、を具備することを特徴とする。
【００１２】
このように形成することにより、誘導加熱装置と冷却水供給装置が制御装置で制御されて、発熱部材が発熱して接続部分が溶融接続されると共に、チューブの冷却水の圧力の調整によりその外径が拡げられて、例えば接続部分の拡がりが抑えられる。
【００１３】
また、請求項５記載の発明は、制御装置が、冷却水供給装置からチューブ内に供給される冷却水の圧力を最初は低くその後は高くなる如く制御し得ることを特徴とする。このように形成することにより、請求項４記載の発明と同様に作用して、樹脂製パイプの接続部分の拡がりが抑えられる。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１〜図５は、本発明に係わる樹脂製パイプの接続装置を示し、図１がその概略構成図、図２がその要部を破断した斜視図、図３がその要部断面図、図４が加熱コイル部分の拡大断面図、図５が接続状態を示す一部破断した側面図である。
【００１５】
図１において、接続装置１は、一対の樹脂製パイプ２、３の端部２ａ、３ａの接続部分１３の周囲に配設される加熱コイル４と、この加熱コイル４に接続された誘導加熱装置としてのトランジスタインバータ５と、加熱コイル内４に冷却水Ｗを循環供給する冷却水供給装置６と、トランジスタインバータ５及び冷却水供給装置６を制御する制御装置７等を有している。
【００１６】
樹脂製パイプ２の端部２ａはストレートに形成され、樹脂製パイプ３の端部３ａには径大部３ｂが形成されている。そして、樹脂製パイプ２の端部２ａが樹脂製パイプ３の径大部３ｂ内に所定距離嵌合され、樹脂製パイプ３の径大部３ｂ内面には、発熱部材８が配設されている。
【００１７】
この発熱部材８は、図２及び図３に示すように、例えばポリウレタン系の溶液内にフェライト粉体等の誘導電流が誘起され易い粉体９を、重量比率で１０％〜７０％混入して形成されたペースト状部材１０で構成され、樹脂パイプ３の径大部３ｂ内面に、例えば刷毛等により略均一に塗布されている。この発熱部材８内の粉体９が後述する如く加熱コイル４への通電によって発熱することになる。なお、このペースト状部材１０は、金型等を利用して所定の弾性を有する板状に成形して使用することもできる。
【００１８】
加熱コイル４は、図４に示すように、円形の銅パイプ１１と、この銅パイプ１１の外周面を覆う如く設けられたチューブ１２を有し、樹脂製パイプ２、３の接続部分１３の外周面側に所定回数巻回された状態で配設されている。チューブ１２は、例えばビニールチューブで直径方向に所定寸法伸縮可能に形成され、このチューブ１２と銅パイプ１１の外周面間には所定の間隙１４が形成されている。
【００１９】
そして、加熱コイル４は、図１に示すように、その両端部が上記チューブ１２と同様のチューブ１５内に、一端が銅パイプ１１に接続された網導線１６が挿通された状態のケーブル１７で、上記トランジスタインバータ５に脱着可能に接続され、このトランジスタインバータ５に冷却水供給装置６が接続されている。これにより、冷却水供給装置６の冷却水Ｗが、トランジスタインバータ５を経由して、チューブ１５、加熱コイル４の銅パイプ１１内及びチューブ１２内に循環供給される。
【００２０】
なお、チューブ１２、１５内に供給される冷却水Ｗの圧力は後述する如く、制御装置７によって可変し得るように設定され、また、加熱コイル４は平面視円形に形成され、初期状態において、樹脂製パイプ２、３の接続部分１３の外周面に対して、僅かな間隙を有する如く設定されている。
【００２１】
上記トランジスタインバータ５は、ＩＧＢＴ、パワーＭＯＳＦＥＴ等の半導体スイッチング素子をオン、オフさせることによって、高周波の大電流を発生させる、図示しないインバータ回路を有している。
【００２２】
次に、この接続装置１の動作について説明する。まず、接続しようとする樹脂製パイプ２、３を用意し、一方の樹脂製パイプ３の径大部３ｂ内面の奥側に、ペースト状部材１０を塗布する。そして、他方の樹脂製パイプ２の端部２ａを所定距離挿入して嵌合状態にする。なお、両パイプ２、３の嵌合作業は適宜の位置決め治具を使用して行えば正確な位置決め状態で嵌合できる。
【００２３】
両樹脂製パイプ２、３が嵌合されると、次に加熱コイル４を接続部分１３の外周面側にセットし、この加熱コイル４を所定位置に保持すると共に、加熱コイル４のケーブル１７をトランジスタインバータ５の出力端子に接続する。そして、この状態で制御装置７を作動させ、その制御信号によりトランジスタインバータ５を作動させると共に、冷却水供給装置６を作動させる。
【００２４】
トランジスタインバータ５が作動すると、所定の高周波電流がケーブル１７の網導線１６を介して加熱コイル４の銅パイプ１１に流れ、円形の加熱コイル４内に位置するペースト状部材１０の粉体９に渦電流が誘起されて、ペースト状部材１０が発熱する。また、トランジスタインバータ５の作動と同時に作動する冷却水供給装置６により、銅パイプ１１内に一定圧力の冷却水Ｗが循環供給され、高周波電流の通電による銅パイプ１１の発熱が抑えられる。
【００２５】
また、冷却水供給装置６の作動により、チューブ１２と銅パイプ１１間の間隙１４内にも冷却水Ｗが循環供給される。この冷却水Ｗは、高周波電流の通電開始直後は、その圧力が低く（例えば銅パイプ１１内圧力と同一に）設定され、所定時間通電した後に、制御装置７の制御信号によりその圧力が高められる。この高められた冷却水Ｗの圧力により、伸縮可能なチューブ１２が、図４の二点鎖線で示すように外側に拡がり外径が大きくなる。このチューブ１２の外周面によって、樹脂製パイプ２、３の接続部分１３の外周面が押さえ付けられる。
【００２６】
ところで、高周波電流の加熱コイル４への通電によりペースト状部材１０が発熱すると、接続部分１３の樹脂製パイプ２、３内の温度が上がり内部圧力が高くなって、樹脂製パイプ２、３が外側に拡がろうとするが、この拡がりが外径が大きくなったチューブ１２によって抑えられることになる。
【００２７】
そして、チューブ１２で外側への移動が抑えられるか、あるいは接続部分１３がチューブ１２で内側に押し付けられた状態で、所定時間ペースト状部材１０が発熱すると、両樹脂製パイプ２、３の端部２ａ、３ａの特に内面が溶融状態となって、互いの樹脂がペースト状部材１０と共に一体化する。これにより、図５に示すように、一対の樹脂製パイプ２、３の端部２ａ、３ａが接続されることになる。
【００２８】
このように、上記実施例の接続装置１においては、一方の樹脂製パイプ３の径大部３ｂ内にペースト状部材１０を塗布し、加熱コイル４に高周波電流を供給することにより、粉体９の渦電流でペースト状部材１０を発熱させるため、接続部分１３を内側から溶融接続することができる。特に接続時に、加熱コイル４のチューブ１２によって接続部分１３の外周面を押さえ付けることができるため、接続部分１３の外側への拡がりを防止しかつ内側に押さえつつ、樹脂製パイプ２、３の接続部分１３を確実に溶融接続できる。
【００２９】
また、接続方法が従来のような接着剤による方法ではなく、樹脂製パイプ２、３自体の溶融一体化による接続であるため、接続部分１３の耐久性を樹脂製パイプ２、３と略同一にすることができると共に、ペースト状部材１０の発熱効果が接続部分１３の内面全域に及ぶため、部分的に接着していない箇所が生じることもなく、長期に亘って安定した接続状態を得ることが可能になる。
【００３０】
さらに、加熱コイル４に接続されたケーブル１７が、トランジスタインバータ５に脱着可能に設けられているため、配管現場まで例えばハンド型の加熱コイル４を延ばして使用することができると共に、トランジスタインバータ５の使用により、加熱装置自体を小型に形成することができ、配管作業現場での樹脂製パイプ２、３の接続作業を容易に行うことができる。
【００３１】
なお、上記実施例において、発熱部材８として粉体９が混入されたペースト状部材１０を使用したが、本発明はこれに何等限定されず、例えば図６及び図７に示す導電性の筒状部材２０を使用しても良い。この筒状部材２０は、図７に示すように樹脂パイプ３の径大部３ｂ内に嵌挿することにより使用される。
【００３２】
その際、筒状部材２０の外周面に軸方向にスリット２１を形成することにより、このスリット２１を利用して筒状部材２０の外径を可変することができ、径大部３ｂの内径に合わせて嵌挿することができる。また、この筒状部材２０において、二点鎖線で示すように一端側に鍔２２を設ければ、樹脂パイプ３の径大部３ｂの段差部３ｃにこの鍔２２を係止させることができ、接続作業時の筒状部材２０の嵌挿状態を安定化させることができる。
【００３３】
また、上記実施例においては、一方の樹脂製パイプ３に径大部３ｂが設けられている場合について説明したが、例えば両樹脂製パイプ２、３の端部２ａ、３ａがストレートな場合は、図８に示すように、所定長さの筒状の継手２３を使用して接続する。
【００３４】
すなわち、継手２３の内面の略中間位置に発熱部材８を嵌挿し、この継手２３の一方側を樹脂製パイプ２の端部２ａに嵌合し、他方側を樹脂製パイプ３の端部３ａを嵌合する。この状態で、継手２３の外周面に上記と同様の加熱コイル４を配設して誘導加熱することにより、両樹脂製パイプ２、３が継手２３を介して溶融接続される。このように形成しても、上記実施例と全く同様の作用効果が得られる。
【００３５】
さらに、上記各実施例においては、一対の樹脂製パイプ２、３を直線状に接続したが、本発明は、樹脂製パイプ２、３を所定角度異なる方向に接続する場合にも適用できる。この場合は、接続する角度に応じて加熱コイル４の形状が変更されることになる。
【００３６】
また、上記実施例においては、トランジスタインバータ５、冷却水供給装置６、制御装置７を別体として説明したが、これらを一つのケース内に収容配設するようにしても良い。また、上記実施例において加熱コイル４を平面視で二分割し得る如く形成すれば、接続部分１３への加熱コイル４のセット作業が容易になる。またさらに、上記実施例における加熱コイル４及び発熱部材８の形態も一例であって、本発明の要旨を逸脱しない範囲において、種々変更可能であることは言うまでもない。
【００３７】
【発明の効果】
以上詳述したように、本発明の樹脂製パイプの接続方法及びその接続装置にあっては、誘導加熱により発熱部材を発熱させ、樹脂製パイプ自体を溶融させると共に、加熱コイル のチューブ内に供給される冷却水により、加熱コイル自体が冷却されて加熱効率が向上すると共に、チューブの外径が拡がることにより、樹脂製パイプの接続部分の拡がりが防止されつつ内側に押し付けられて接続されるため、樹脂製パイプの接続を確実かつ良好に行うことができ、長期に亘って安定して接続状態が得られると共に、例えば水漏れ等により修理作業を極力少なくし得て、コスト低減が図れる等の効果を奏する。
【図面の簡単な説明】
【図１】 本発明に係わる樹脂製パイプの接続装置の概略構成図
【図２】 同その要部を破断した斜視図
【図３】 同その要部断面図
【図４】 同加熱コイル部分の拡大断面図
【図５】 同接続状態を示す一部破断した側面図
【図６】 同他の発熱部材の斜視図
【図７】 同そのセット状態の要部断面図
【図８】 本発明に係わる樹脂製パイプの他の接続方法を示す概略構成図
【符号の説明】
１ 接続装置
２、３ 樹脂製パイプ
２ａ、３ａ 端部
４ 加熱コイル
５ トランジスタインバータ
６ 冷却水供給装置
７ 制御装置
８ 発熱部材
９ 粉体
１０ ペースト状部材
１１ 銅パイプ
１２ チューブ
１３ 接続部分
１４ 間隙
１７ ケーブル
２０ 筒状部材
２３ 継手
Ｗ 冷却水[0001]
[Industrial application fields]
The present invention relates to a method for connecting resin pipes used in piping, for example, and a connection device therefor.
[0002]
[Prior art]
Conventionally, for example, vinyl chloride pipes (hereinafter referred to as resin pipes) used for piping of water and various solutions and piping for electrical wiring have been set to a predetermined length, and therefore, depending on the situation of the piping location It is necessary to connect using etc. For this connection, generally, a predetermined adhesive is applied to the outer peripheral surface of the end face of the resin pipe to be connected, and this applied portion is fitted into the joint, or the end of one resin pipe is connected. The diameter is increased by heating, the application portion of the other resin pipe to which the adhesive is applied is fitted, and the adhesive is cured by being left standing for a predetermined time.
[0003]
[Problems to be solved by the invention]
However, the above connection method has a problem that the durability of the connection portion of the resin pipe is inferior and it is difficult to obtain a stable connection state over a long period of time. That is, since the connecting portion of the resin pipe is only connected through an adhesive, if the adhesive is not evenly applied, a slight gap is formed in the bonded portion, which may cause water leakage and the like. . Also, depending on the adhesive application state, the durability of the adhesive may be inferior to the durability of the resin pipe. It becomes difficult to obtain a stable connection state, for example, a gap is formed in the gap.
[0004]
As a result, for example, when the pipe itself is arranged under the floor of a general house or inside a wall of a high-rise building, or when it is buried in the concrete (asphalt) of a road, When a water leak occurs, the work of searching for a water leak portion and the repair work thereof are very difficult in terms of location, and the repair is very expensive.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin that can be reliably connected by melting the resin pipe itself, and can be stably connected over a long period of time. An object of the present invention is to provide a pipe connecting method and a connecting apparatus therefor.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is a method of connecting resin pipes for connecting the ends of at least two resin pipes, and generates heat by induction heating on the inner surface of the connection part of the resin pipes. A step of disposing a heat generating member; and a heating coil disposed on the outer peripheral surface side of the connecting portion and connected to an induction heating device and covered with a radially expandable / contracting tube. Melting the connecting portion of the pipe, and supplying cooling water into the tube to expand the outer diameter of the tube with the pressure to abut the outer peripheral surface of the resin pipe of the connecting portion. Features.
[0007]
By forming in this way, cooling water of a predetermined pressure is supplied into the tube of the heating coil during induction heating, the outer diameter of the tube is expanded by the pressure of this cooling water, and the connecting part of the resin pipe is pressed from the outside. It is done. The connecting part of the resin pipe becomes flexible due to the heat generated by the heat generating member and tends to spread outward due to the internal temperature, etc., but this expansion is restricted by the pressing of the tube of the heating coil, and after connection the outer diameter of the connecting part becomes A large change does not occur, and the connecting portion of both resin pipes is surely melted and connected by pressing from the outer peripheral surface side.
[0008]
The invention according to claim 2 is characterized in that the pressure of the cooling water supplied to the tube can be varied in accordance with the induction heating time. After heating for a period of time, the pressure of the cooling water can be increased and the expansion of the resin pipe can be reliably suppressed by the tube.
[0009]
According to a third aspect of the present invention, there is provided a heat generating member disposed at a connecting portion of a resin pipe having a predetermined length and generating heat by induction heating, and disposed on an outer peripheral surface side of the connecting portion and connected to an induction heating device. And a heating coil covered with a radially expandable tube, and cooling water is supplied into the heating coil to expand the outer diameter of the tube so as to contact the outer peripheral surface of the resin pipe at the connecting portion. And a cooling water supply device.
[0010]
By forming in this way, the cooling member is supplied into the heating coil to suppress the heat generation of the heating coil, the heat generating member is heated, and the connection portion of both resin pipes is melted and connected using this heat generation. . In addition, the cooling water supplied into the tube of the heating coil cools the heating coil itself, improving the heating efficiency, and expanding the outer diameter of the tube, thereby preventing the connection portion of the resin pipe from expanding. Pressed inside, good adhesion is obtained.
[0011]
According to a fourth aspect of the present invention, there is provided a heat generating member disposed at a connecting portion of a resin pipe having a predetermined length and generating heat by induction heating, and an outer peripheral surface of the copper pipe disposed on the outer peripheral surface side of the connecting portion. An induction heating device that supplies current to a heating coil covered with a tube that can expand and contract in a radial direction with a predetermined gap, a cooling water supply device that supplies cooling water into the copper pipe and the tube of the heating coil, and induction And a control device for controlling the heating device and the cooling water supply device.
[0012]
By forming in this way, the induction heating device and the cooling water supply device are controlled by the control device, the heat generating member generates heat, the connection portion is melted and connected, and the outside is adjusted by adjusting the cooling water pressure of the tube. The diameter is expanded, for example, the expansion of the connection portion is suppressed.
[0013]
The invention according to claim 5 is characterized in that the control device can control the pressure of the cooling water supplied from the cooling water supply device into the tube to be low at first and then high. By forming in this way, it acts like the invention of Claim 4 , and the expansion of the connection part of a resin-made pipe is suppressed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5 show a connecting apparatus for resin pipes according to the present invention, FIG. 1 is a schematic configuration diagram thereof, FIG. 2 is a perspective view in which the principal part is broken, and FIG. 3 is a sectional view of the principal part. 4 is an enlarged sectional view of a heating coil portion, and FIG. 5 is a partially broken side view showing a connected state.
[0015]
In FIG. 1, a connection device 1 includes a heating coil 4 disposed around a connection portion 13 of ends 2 a and 3 a of a pair of resin pipes 2 and 3, and an induction heating device connected to the heating coil 4. As a transistor inverter 5, a cooling water supply device 6 that circulates and supplies the cooling water W into the heating coil 4, a control device 7 that controls the transistor inverter 5 and the cooling water supply device 6, and the like.
[0016]
The end 2 a of the resin pipe 2 is formed straight, and the end 3 a of the resin pipe 3 is formed with a large diameter portion 3 b. The end 2a of the resin pipe 2 is fitted into the large diameter portion 3b of the resin pipe 3 by a predetermined distance, and the heat generating member 8 is disposed on the inner surface of the large diameter portion 3b of the resin pipe 3. .
[0017]
As shown in FIGS. 2 and 3, the heat generating member 8 includes, for example, 10% to 70% by weight of a powder 9 in which an induced current such as ferrite powder is easily induced in a polyurethane-based solution. The formed paste-like member 10 is applied substantially uniformly to the inner surface of the large-diameter portion 3b of the resin pipe 3 with, for example, a brush. The powder 9 in the heat generating member 8 generates heat by energizing the heating coil 4 as will be described later. In addition, this paste-like member 10 can also be used by being molded into a plate shape having a predetermined elasticity using a mold or the like.
[0018]
As shown in FIG. 4, the heating coil 4 includes a circular copper pipe 11 and a tube 12 provided so as to cover the outer peripheral surface of the copper pipe 11, and the outer periphery of the connecting portion 13 of the resin pipes 2 and 3. It is arranged in a state wound around the surface side a predetermined number of times. The tube 12 is, for example, a vinyl tube and is formed so as to be able to expand and contract by a predetermined dimension in the diameter direction, and a predetermined gap 14 is formed between the tube 12 and the outer peripheral surface of the copper pipe 11.
[0019]
As shown in FIG. 1, the heating coil 4 is a cable 17 in a state where both ends of the heating coil 4 are inserted into a tube 15 similar to the tube 12 and a network wire 16 having one end connected to the copper pipe 11 is inserted. The transistor inverter 5 is detachably connected to the transistor inverter 5, and a cooling water supply device 6 is connected to the transistor inverter 5. Thereby, the cooling water W of the cooling water supply device 6 is circulated and supplied to the tube 15, the copper pipe 11 of the heating coil 4, and the tube 12 via the transistor inverter 5.
[0020]
As will be described later, the pressure of the cooling water W supplied into the tubes 12 and 15 is set so as to be variable by the control device 7, and the heating coil 4 is formed in a circular shape in plan view. It is set to have a slight gap with respect to the outer peripheral surface of the connecting portion 13 of the resin pipes 2 and 3.
[0021]
The transistor inverter 5 has an inverter circuit (not shown) that generates a high-frequency large current by turning on and off semiconductor switching elements such as IGBTs and power MOSFETs.
[0022]
Next, the operation of the connection device 1 will be described. First, the resin pipes 2 and 3 to be connected are prepared , and the paste-like member 10 is applied to the back side of the inner surface of the large diameter portion 3b of one resin pipe 3. Then, the end 2a of the other resin pipe 2 is inserted by a predetermined distance to be in a fitted state. In addition, if the fitting operation | work of both the pipes 2 and 3 is performed using an appropriate positioning jig, it can fit in an exact positioning state.
[0023]
When the two resin pipes 2 and 3 are fitted, the heating coil 4 is then set on the outer peripheral surface side of the connecting portion 13, the heating coil 4 is held in a predetermined position, and the cable 17 of the heating coil 4 is connected. Connected to the output terminal of the transistor inverter 5. Then, in this state, the control device 7 is operated, the transistor inverter 5 is operated by the control signal, and the cooling water supply device 6 is operated.
[0024]
When the transistor inverter 5 is activated, a predetermined high-frequency current flows through the wire 16 of the cable 17 to the copper pipe 11 of the heating coil 4 and vortexes in the powder 9 of the pasty member 10 located in the circular heating coil 4. An electric current is induced and the paste-like member 10 generates heat. In addition, the cooling water supply device 6 that operates simultaneously with the operation of the transistor inverter 5 circulates and supplies the cooling water W at a constant pressure into the copper pipe 11, thereby suppressing the heat generation of the copper pipe 11 due to energization of the high-frequency current.
[0025]
Further, the cooling water W is circulated and supplied also into the gap 14 between the tube 12 and the copper pipe 11 by the operation of the cooling water supply device 6. Immediately after the start of energization of the high-frequency current, the pressure of the cooling water W is set to be low (for example, the same as the pressure in the copper pipe 11), and after energization for a predetermined time, the pressure is increased by a control signal of the control device 7. . Due to the increased pressure of the cooling water W, the expandable tube 12 expands outward as shown by a two-dot chain line in FIG. The outer peripheral surface of the connecting portion 13 of the resin pipes 2 and 3 is pressed by the outer peripheral surface of the tube 12.
[0026]
By the way, when the paste-like member 10 generates heat by energizing the heating coil 4 with high-frequency current, the temperature in the resin pipes 2 and 3 of the connecting portion 13 rises and the internal pressure increases, and the resin pipes 2 and 3 are outside. However, the expansion is suppressed by the tube 12 having an increased outer diameter.
[0027]
When the paste member 10 generates heat for a predetermined time in a state in which the tube 12 suppresses the outward movement or the connection portion 13 is pressed inward by the tube 12, the end portions of the two resin pipes 2 and 3 are used. In particular, the inner surfaces of 2 a and 3 a are in a molten state, and the resins are integrated together with the paste-like member 10. As a result, as shown in FIG. 5, the ends 2a and 3a of the pair of resin pipes 2 and 3 are connected.
[0028]
Thus, in the connection device 1 of the above embodiment, the paste-like member 10 is applied in the large-diameter portion 3b of one resin pipe 3, and the high-frequency current is supplied to the heating coil 4, whereby the powder 9 Since the pasty member 10 is heated by the eddy current, the connecting portion 13 can be melt-connected from the inside. In particular, since the outer peripheral surface of the connection portion 13 can be pressed by the tube 12 of the heating coil 4 at the time of connection, the connection of the resin pipes 2 and 3 is prevented while preventing the connection portion 13 from spreading outward and holding the connection portion 13 inward. The portion 13 can be reliably melted and connected.
[0029]
In addition, since the connection method is not a conventional method using an adhesive but a connection by melting and integrating the resin pipes 2 and 3 themselves, the durability of the connection portion 13 is substantially the same as that of the resin pipes 2 and 3. In addition, since the heat generation effect of the paste-like member 10 extends over the entire inner surface of the connection portion 13, there is no part that is not partially bonded, and a stable connection state can be obtained over a long period of time. It becomes possible.
[0030]
Furthermore, since the cable 17 connected to the heating coil 4 is detachably attached to the transistor inverter 5, for example, the hand-type heating coil 4 can be extended to the piping site and used. By use, the heating device itself can be formed in a small size, and the connection work of the resin pipes 2 and 3 at the piping work site can be easily performed.
[0031]
In the above embodiment, the paste-like member 10 in which the powder 9 is mixed is used as the heat generating member 8, but the present invention is not limited to this. For example, the conductive cylindrical shape shown in FIGS. The member 20 may be used. The cylindrical member 20 is used by being fitted into the large diameter portion 3b of the resin pipe 3 as shown in FIG.
[0032]
At that time, by forming the slit 21 in the axial direction on the outer peripheral surface of the cylindrical member 20, the outer diameter of the cylindrical member 20 can be varied using this slit 21, and the inner diameter of the large diameter portion 3b can be changed. It can be fitted and inserted. Moreover, in this cylindrical member 20, if the collar 22 is provided on one end side as shown by a two-dot chain line, the collar 22 can be locked to the stepped portion 3c of the large diameter portion 3b of the resin pipe 3, The fitting state of the cylindrical member 20 at the time of connection work can be stabilized.
[0033]
Moreover, in the said Example, although the case where the large diameter part 3b was provided in one resin pipe 3 was demonstrated, for example, when the edge parts 2a and 3a of both resin pipes 2 and 3 are straight, As shown in FIG. 8, it connects using the cylindrical coupling 23 of predetermined length.
[0034]
That is, the heat generating member 8 is fitted and inserted at a substantially intermediate position on the inner surface of the joint 23, one side of the joint 23 is fitted to the end 2a of the resin pipe 2, and the other side of the end 3a of the resin pipe 3 is fitted. Mating. In this state, the heating coil 4 similar to the above is disposed on the outer peripheral surface of the joint 23 and induction heating is performed, whereby both the resin pipes 2 and 3 are melt-connected through the joint 23. Even if it forms in this way, the completely same effect as the said Example is acquired.
[0035]
Furthermore, in each of the above embodiments, the pair of resin pipes 2 and 3 are connected in a straight line, but the present invention can also be applied to the case where the resin pipes 2 and 3 are connected in directions different by a predetermined angle. In this case, the shape of the heating coil 4 is changed according to the connecting angle.
[0036]
Moreover, in the said Example, although the transistor inverter 5, the cooling water supply apparatus 6, and the control apparatus 7 were demonstrated as a different body, you may make it accommodate these in one case. Further, in the above embodiment, if the heating coil 4 is formed so as to be divided in two in plan view, the setting operation of the heating coil 4 to the connecting portion 13 becomes easy. Furthermore, the form of the heating coil 4 and the heat generating member 8 in the above embodiment is also an example, and it goes without saying that various modifications can be made without departing from the scope of the present invention.
[0037]
【The invention's effect】
As described above in detail, in the method and apparatus for connecting a resin pipe of the present invention, the heating member is heated by induction heating, and the resin pipe itself is melted and supplied into the tube of the heating coil. The heating coil itself is cooled by the cooling water to be heated, so that the heating efficiency is improved and the outer diameter of the tube is expanded, so that the connecting portion of the resin pipe is prevented from expanding and connected to the inner side while being pressed. The resin pipe can be reliably and satisfactorily connected, and a stable connection state can be obtained over a long period of time, and repair work can be reduced as much as possible, for example, due to water leakage, etc. There is an effect.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a resin pipe connecting device according to the present invention. FIG. 2 is a perspective view of the main part thereof broken. FIG. 3 is a cross-sectional view of the main part. Enlarged cross-sectional view [FIG. 5] Partially cutaway side view showing the same connection state [FIG. 6] Perspective view of the other heat generating member [FIG. 7] The main part cross-sectional view of the set state [FIG. Schematic configuration diagram showing other connection methods for plastic pipes
DESCRIPTION OF SYMBOLS 1 Connection apparatus 2, 3 Resin pipe 2a, 3a End 4 Heating coil 5 Transistor inverter 6 Cooling water supply apparatus 7 Control apparatus 8 Heat generating member 9 Powder 10 Paste-like member 11 Copper pipe 12 Tube 13 Connection part 14 Gap 17 Cable 20 Tubular member 23 Joint W Cooling water

Claims (5)

少なくとも２本の樹脂製パイプの端部を接続する樹脂製パイプの接続方法において、前記樹脂製パイプの接続部分内面に誘導加熱により発熱する発熱部材を配設するステップと、接続部分の外周面側に配設され誘導加熱装置に接続されると共に、径方向に伸縮可能なチューブで覆われた加熱コイルで前記発熱部材を誘導加熱し両パイプの接続部分を溶融させるステップと、前記チューブ内に冷却水を供給してその圧力でチューブの外径を拡げ接続部分の樹脂製パイプの外周面に当接させるステップと、を具備することを特徴とする樹脂製パイプの接続方法。 In the method of connecting resin pipes for connecting the ends of at least two resin pipes, a step of disposing a heat generating member that generates heat by induction heating on the inner surface of the connecting portion of the resin pipe, and the outer peripheral surface side of the connecting portion The heating member is induction-heated by a heating coil covered with a radially expandable tube that is connected to the induction heating device and melted at the connecting portion of both pipes, and cooled in the tube And a step of supplying water to expand the outer diameter of the tube by the pressure and abutting it on the outer peripheral surface of the resin pipe at the connection portion. 前記チューブに供給される冷却水の圧力が、誘導加熱時間に応じて可変され得ることを特徴とする、請求項１記載の樹脂製パイプの接続方法。 The method of connecting resin pipes according to claim 1, wherein the pressure of the cooling water supplied to the tube can be varied according to the induction heating time . 所定長さの樹脂製パイプの接続部分に配設され誘導加熱により発熱する発熱部材と、前記接続部分の外周面側に配設されて誘導加熱装置に接続されると共に径方向に伸縮可能なチューブで覆われた加熱コイルと、該加熱コイル内に冷却水を供給して前記チューブの外径を拡げて接続部分の樹脂製パイプの外周面に当接させる冷却水供給装置と、を具備することを特徴とする樹脂製パイプの接続装置。A heat generating member that is disposed in a connecting portion of a resin pipe having a predetermined length and generates heat by induction heating, and a tube that is disposed on the outer peripheral surface side of the connecting portion and is connected to an induction heating device and expandable in the radial direction. And a cooling water supply device for supplying cooling water into the heating coil and expanding the outer diameter of the tube so as to contact the outer peripheral surface of the resin pipe at the connection portion. A resin pipe connection device characterized by the above. 所定長さの樹脂製パイプの接続部分に配設され誘導加熱により発熱する発熱部材と、前記接続部分の外周面側に配設され、その銅パイプの外周面が所定の間隙で径方向に伸縮可能なチューブで覆われた加熱コイルに電流を供給する誘導加熱装置と、前記加熱コイルの銅パイプ内及びチューブ内に冷却水を供給する冷却水供給装置と、前記誘導加熱装置及び冷却水供給装置を制御する制御装置と、を具備することを特徴とする樹脂製パイプの接続装置。  A heat generating member that is disposed in a connecting portion of a resin pipe having a predetermined length and generates heat by induction heating, and is disposed on the outer peripheral surface side of the connecting portion, and the outer peripheral surface of the copper pipe expands and contracts in the radial direction with a predetermined gap. An induction heating device that supplies current to a heating coil covered with a tube, a cooling water supply device that supplies cooling water into a copper pipe and a tube of the heating coil, and the induction heating device and cooling water supply device A resin pipe connecting device, comprising: 前記制御装置が、冷却水供給装置からチューブ内に供給される冷却水の圧力を最初は低くその後は高くなる如く制御し得ることを特徴とする、請求項４記載の樹脂製パイプの接続装置。5. The resin pipe connecting device according to claim 4 , wherein the control device can control the pressure of the cooling water supplied from the cooling water supply device into the tube to be initially low and then high.
JP30099596A 1996-10-25 1996-10-25 Method and apparatus for connecting resin pipes Expired - Fee Related JP3722249B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30099596A JP3722249B2 (en) 1996-10-25 1996-10-25 Method and apparatus for connecting resin pipes

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Application Number Priority Date Filing Date Title
JP30099596A JP3722249B2 (en) 1996-10-25 1996-10-25 Method and apparatus for connecting resin pipes

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JP3722249B2 true JP3722249B2 (en) 2005-11-30

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Publication number Priority date Publication date Assignee Title
JP4754724B2 (en) * 2001-06-08 2011-08-24 株式会社ミヤデン Plastic pipe shaping device
JP5840263B2 (en) * 2014-07-24 2016-01-06 株式会社ミヤデン Fuel tank thermal welding equipment
JP5840264B2 (en) * 2014-07-24 2016-01-06 株式会社ミヤデン Fuel tank thermal welding equipment

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