JP3629749B2 - 電気融着継手 - Google Patents

電気融着継手 Download PDF

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Publication number
JP3629749B2
JP3629749B2 JP07869095A JP7869095A JP3629749B2 JP 3629749 B2 JP3629749 B2 JP 3629749B2 JP 07869095 A JP07869095 A JP 07869095A JP 7869095 A JP7869095 A JP 7869095A JP 3629749 B2 JP3629749 B2 JP 3629749B2
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Prior art keywords
joint
opening
resin
inner diameter
peripheral surface
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JPH08277987A (ja
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崇朗 吉井
英男 関口
孝行 直嶋
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JFE Engineering Corp
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JFE Engineering Corp
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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"
    • B29C65/3404—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" characterised by the type of heated elements which remain in the joint
    • B29C65/342—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" characterised by the type of heated elements 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"
    • B29C65/3468—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" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of 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
    • B29C66/12—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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/322—Providing cavities in the joined article to collect the burr
    • 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
    • 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
    • B29C66/90—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
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91315—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring 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
    • B29C66/914—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
    • 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"
    • B29C65/3472—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" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—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" characterised by the composition of the heated elements which remain in the joint being metallic

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

Description

【０００１】
【産業上の利用分野】
本発明は、熱可塑性樹脂からなるガス管、水道管などを接続するための電気融着継手、特に、その呼び径が７５Ａ以上の大口径の電気融着継手に関する。
【０００２】
【従来の技術】
熱可塑性樹脂でできたガス管、水道管などを接続するための電気融着継手のうち、その呼び径が７５Ａ以上の大口径管用継手では、継手本体の内周面と接続すべき樹脂管の外周面との隙間量が大きくなり、融着時に溶融樹脂が継手開口部から流出することがしばしば起こる。このため樹脂を溶融するために設けてある電熱線も移動し、場合によっては電熱線の短絡という重大なトラブルを招くことがある。
【０００３】
特に、従来の継手のうち、軽量化のため継手の中央部から開口部にかけてテーパー状、あるいは円弧状に肉厚を減じてある継手では、融着時に起こる溶融樹脂の熱膨張によって生じる圧力により継手開口部が拡径し、樹脂流出が起こりやすい。
【０００４】
上記の問題を解決するために、特開昭６２ー１５１６８８号公報、特開昭６４ー７４３８１号公報、特開平４ー１７１３９２号公報、特開平４ー２５８５９４号公報には、継手開口部をワイヤー、形状記憶合金、樹脂テープなどで絞めて、開口部の拡径を押さえ、樹脂の流出を防ぐ方法が提案されている。また、加熱部の溶融樹脂の熱膨張により非加熱部の開口部が縮径するように樹脂の加熱溶融する部分を等肉厚の平坦な構造とし、内圧強度の確保のため継手中央部や開口部の肉厚を厚くした継手も、文献〔Ｓ．ＭｃＰｈｅｒｓｏｎ：ＰＬＡＳＴＩＣＳ ＰＩＰＥＳ ＶＩＩＩ，Ｐｒｏｃｅｅｄｉｎｇｓ ｏｆ Ｃｏｎｆｅｒｅｎｃｅ，ＴＨＥ ＰＬＡＳＴＩＣＳ ＡＮＤ ＲＵＢＢＥＲ ＩＮＳＴＩＴＵＴＥ，１９９２〕に紹介されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、特開昭６２ー１５１６８８号公報、特開昭６４ー７４３８１号公報、特開平４ー１７１３９２号公報、特開平４ー２５８５９４号公報に記載された継手開口部を絞める方法では、電気融着接合の工程が複雑になるとともに、コスト高となる。前記文献に記載された方法では、継手本体の内周面と接続すべき樹脂管の外周面との隙間量が大きくなりすぎると、溶融樹脂の熱膨張により非加熱部の開口部が縮径しても、開口部の内周面は樹脂管の外周面にフィットしなくなり、完全には樹脂流出を防止できなくなる。
【０００６】
また、電気融着継手には、良好な融着性能を確保するため、継手樹脂の温度や圧力を検出するセンサーを継手開口部近傍にある電熱線の上部に設け、電熱線の通電時間を制御できるものもある。前述のようにその呼び径が７５Ａ以上に大きくなると、継手本体の内周面と接続すべき樹脂管の外周面との隙間量が大きくなり、しかも寸法公差があったり、樹脂管をスクレープして（表面を削って）継手に挿入するため、センサー位置におけるこの隙間量を常に一定に保つことが難しくなる。この隙間量が小さすぎると樹脂管側への伝熱量が大きくなって、継手樹脂の特性変化が小さくなりすぎ、また、隙間量が大きすぎると継手側への伝熱量が大きくなって、継手樹脂の特性変化が急激に起こるため、センサーによる安定した通電時間の制御ができなくなり、融着不良を引き起こし易くなる。
【０００７】
本発明はこのような問題を解決するためになされたもので、融着時に継手開口部から溶融樹脂の流出が起こらない電気融着継手、および樹脂流出が起こらずしかもセンサーによる安定した通電制御が可能な通電制御用センサーを備えた電気融着継手を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題は、継手開口部の内径が継手電熱線配設部の内径よりも小さく、かつ継手開口部の肉厚が継手電熱線配設部の肉厚よりも厚いことを特徴とする電気融着継手および前記継手開口部近傍に通電制御用センサーを備えた前記電気融着継手により解決される。
【０００９】
【作用】
融着時、継手電熱線配設部においては溶融樹脂の熱膨張が起こる。呼び径が７５Ａ以上の大口径の電気融着継手の場合、耐圧強度の確保のためその肉厚が厚いので、この膨張した溶融樹脂は、主に管軸方向すなわち開口部に向かって流れ出す。このとき開口部の内径を電熱線配設部の内径より小さくすれば、開口部の内周面と接続すべき樹脂管の外周面との隙間量を小さくでき、かつ開口部の肉厚が厚くなるのでその剛性も高められ開口部の拡径を起こり難くできるので、樹脂流出を防止できる。
【００１０】
通電制御用センサーを備えた電気融着継手において、開口部の内径を電熱線配設部の内径より小さくし、接続すべき樹脂管を、その外周面を前記開口部の内周面に接触させながら継手に挿入すれば、開口部近傍に設けらたセンサー位置において、継手の内周面と樹脂管の外周面との隙間量をより確実に一定にすることができるので、センサーによる安定した通電制御が行える。
【００１１】
開口部の内径を電熱線配設部の内径よりどれくらい小さくするかは、継手を構成する樹脂の種類や継手の形状、呼び径、肉厚あるいはセンサー位置やセンサーの種類などにより、その最適値が異なるので、それぞれに適した値を予め求めておく必要がある。なお、開口部の内径は、樹脂管の継手への挿入性を悪化させるほど小さく（樹脂管の最大外径より小さく）はできない。
【００１２】
【実施例】
（実施例１）
図１に、本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図を示す。図で、１は継手本体、２は樹脂管、３は継手開口部、４は継手電熱線配設部、５は電熱線、６はストッパー、７は継手中央部である。なお、以下の図においては、図１と同一の部位には同一の符号を付して、説明を省略する。
【００１３】
継手本体１に接続すべき樹脂管２を、その先端がストッパー６にあたるまで挿入するとき、継手開口部３の内径を継手電熱線配設部４の内径より小さくすると、継手開口部３においては、継手開口部３の内周面と樹脂管２の外周面との隙間量が小さくなり、しかも継手開口部３の肉厚が厚くなるのでその剛性を高められ継手開口部３の拡径を起こり難くできるので、樹脂流出を防止できる。
【００１４】
図２に、本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図を示す。この電気融着継手は、図１の電気融着継手の軽量化のために、継手中央部７から継手開口部３にかけて継手の肉厚を減じたものである。この場合も、図１の電気融着継手の場合と同様な原理で樹脂流出を防止できる。
【００１５】
図３に、本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図を示す。この電気融着継手は、図１の電気融着継手において継手開口部３の内径を継手電熱線配設部４の内径より小さくするにあたり、継手電熱線配設部４から継手開口部３にかけて除々に小さくしたものである。こうすることにより、融着時の樹脂流出を防止できるばかりか、射出成形後の中子の取り出しがより容易に行える。
【００１６】
図４に、本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図を示す。この電気融着継手は、図３の電気融着継手において継手中央部７の内径も、継手開口部３の内径と同程度に小さくしたものである。こうすることにより、図３の電気融着継手よりもさらに安定して継手本体１の内周面と樹脂管２の外周面との隙間量を調整できる。
【００１７】
（実施例２）
図５に、本発明の１実施例である通電制御用センサーを備えた電気融着継手の管軸に対し直角方向から見た断面形状図を示す。図で、８は通電制御用センサー、９は通電ターミナルである。この電気融着継手は、図１の電気融着継手において継手中央部７の内径も、継手開口部３の内径と同程度に小さくしてあり、かつ継手開口部３近傍にある電熱線５の上部に通電制御用センサー８を設けたものである。継手開口部３の内径を電熱線配設部４の内径より小さくしてあるので、樹脂流出を防止できるばかりか、通電制御用センサー８の位置において継手本体１の内周面と樹脂管２の外周面との隙間量を一定にできるので通電ターミナル９を介した通電条件を安定して制御できる。さらに、継手中央部７の内径も、継手開口部３の内径と同程度に小さくしてあるので、通電制御用センサー８の位置における継手本体１の内周面と樹脂管２の外周面との隙間量をより確実に一定にでき、より安定した通電制御が可能となる。
【００１８】
【発明の効果】
本発明は以上説明したように構成されているので、融着時に継手開口部から溶融樹脂の流出が起こらない電気融着継手、および樹脂流出が起こらずしかもセンサーによる安定した通電制御が可能な通電制御用センサーを備えた電気融着継手を提供することができる。
【図面の簡単な説明】
【図１】本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図である。
【図２】本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図である。
【図３】本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図である。
【図４】本発明の１実施例である電気融着継手の管軸に対し直角方向から見た断面形状図である。
【図５】本発明の１実施例である通電制御用センサーを備えた電気融着継手の管軸に対し直角方向から見た断面形状図である。
【符号の説明】
１ 継手本体
３ 継手開口部
４ 継手電熱線配線部
８ 通電制御用センサー

Claims (2)

  1. 継手開口部の内径が継手電熱線配設部の内径よりも小さく、かつ継手開口部の肉厚が継手電熱線配設部の肉厚よりも厚いことを特徴とする電気融着継手。
  2. 前記継手開口部近傍に通電制御用センサーを備えたことを特徴とする請求項１に記載の電気融着継手。
JP07869095A 1995-04-04 1995-04-04 電気融着継手 Expired - Lifetime JP3629749B2 (ja)

Priority Applications (1)

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JP07869095A JP3629749B2 (ja) 1995-04-04 1995-04-04 電気融着継手

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JPH08277987A JPH08277987A (ja) 1996-10-22
JP3629749B2 true JP3629749B2 (ja) 2005-03-16

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JP5173571B2 (ja) * 2008-05-09 2013-04-03 大阪瓦斯株式会社 エレクトロフュージョン継手
WO2016127103A2 (en) * 2015-02-06 2016-08-11 Mencos Ruben Adolfo Electrofusion pipe fittings, methods, and systems

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