JP2914600B2 - 電気融着用継手 - Google Patents

電気融着用継手

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Publication number
JP2914600B2
JP2914600B2 JP5073408A JP7340893A JP2914600B2 JP 2914600 B2 JP2914600 B2 JP 2914600B2 JP 5073408 A JP5073408 A JP 5073408A JP 7340893 A JP7340893 A JP 7340893A JP 2914600 B2 JP2914600 B2 JP 2914600B2
Authority
JP
Japan
Prior art keywords
wire
magnetic alloy
alloy layer
joint
resistance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP5073408A
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English (en)
Other versions
JPH06281080A (ja
Inventor
秀樹 倍
卓 多胡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
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Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP5073408A priority Critical patent/JP2914600B2/ja
Publication of JPH06281080A publication Critical patent/JPH06281080A/ja
Application granted granted Critical
Publication of JP2914600B2 publication Critical patent/JP2914600B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • 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"
    • B29C65/36—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
    • B29C65/3672—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
    • B29C65/3676—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 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
    • B29C66/01—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
    • 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
    • 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
    • B29C65/3444—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 being a ribbon, band or strip
    • 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
    • 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
    • B29C65/3644—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 being a ribbon, band or strip
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene

Landscapes

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

Description

【発明の詳細な説明】
【０００１】
【産業上の利用分野】この発明は電気融着用継手に関
し、特にたとえばガス用あるいは水道用パイプ等を電気
融着接合するのに用いられる、電気融着用継手に関す
る。
【０００２】
【従来の技術】たとえば特公平１−４０７４３号（１９
８９年８月３１日公告）などに示される従来の電気融着
用継手１は、図５に示すように、合成樹脂からなる略中
空円筒状の本体２を含む。本体２の中空部は、受口３と
なり、受口３の内周面近傍には、コイル状に巻回された
電熱線４が設けられる。また、電熱線４の両端部には、
本体２から突出して端子５が設けられる。そして、接合
時には、本体２の受口３に接合すべき図示しないパイプ
を挿入し、端子５に低周波電源６を接続して電熱線４に
通電するようにしていた。
【０００３】
【発明が解決しようとする課題】従来の電気融着用継手
１では、電熱線４で加熱するようにしているので、温度
調整が難しく、温度むらが生じやすいという問題点があ
った。そこで、最近では、たとえば国際出願ＰＣＴ／Ｕ
Ｓ９０／０７３１３１号に示す図６に図示したような電
気融着用継手８が提案され、あるいは実現されている。
この電気融着用継手８では、上述の電熱線４（図４）に
代えて磁性合金を含む線材７を設け、端子５に高周波電
圧を印加し、磁性合金の自己温度調整機能を用いて加熱
するようにしている。
【０００４】しかし、この電気融着用継手８では、端子
５に高周波電圧を印加する必要があるため、低周波電源
６（図５）しか所有しないユーザは、高周波電源９を入
手するまで電気融着用継手８を採用することができず、
不便であった。それゆえに、この発明の主たる目的は、
両方の電源が使用できる、電気融着用継手を提供するこ
とである。
【０００５】
【課題を解決するための手段】この発明は、合成樹脂か
らなる本体，本体の接合面近傍に設けられる線材および
線材の両端部に設けられる２つの端子を有する電気融着
用継手において、線材は、導電層とその表面に形成され
る磁性合金層とを含み、２つの端子に低周波電圧を印加
したときその合成抵抗で発熱し、高周波電圧を印加した
とき前記磁性合金層で発熱することを特徴とする、電気
融着用継手である。
【０００６】
【作用】導電層の表面に磁性合金層を形成した線材を継
手の接合面近傍に設ける。線材の合成抵抗は、従来の電
気融着用継手（図５）で用いた電熱線の抵抗とほぼ等し
くされ、磁性合金層のキュリー温度は、接合時の最適融
着温度に設定される。したがって、端子に低周波電圧を
印加すると、線材はその合成抵抗で発熱する。他方、高
周波電圧を印加すると、表皮効果によって電流が集中す
る磁性合金層で発熱する。すなわち、磁性合金層の温度
が上昇してキュリー温度に達すると、表皮効果がなくな
り、電流のほとんどは抵抗の小さい導電層を流れるよう
になる。したがって、磁性合金層はそれ以上発熱しなく
なる。熱放射によって磁性合金層の温度が低下すると、
再び表皮効果によって発熱し、温度が上昇する。
【０００７】
【発明の効果】この発明によれば、低周波電源および高
周波電源のいずれにも適用できるので、この発明に従っ
た電気融着用継手は、従来の一方の電源しか使えないも
のに比べて、極めて利便性の高いものとなる。この発明
の上述の目的，その他の目的，特徴および利点は、図面
を参照して行う以下の実施例の詳細な説明から一層明ら
かとなろう。
【０００８】
【実施例】図１に示すこの実施例の電気融着用継手１０
は、たとえばポリエチレン等の合成樹脂からなる略中空
円筒状の本体１２を含む。本体１２の中空部は、接合す
べきパイプ１４を受け入れる受口１６となり、受口１６
の内表面近傍には、コイル状に巻回された線材１８が設
けられる。
【０００９】線材１８は、図２からよくわかるように、
たとえば銅−ニッケル合金等の導電体からなる断面円形
の導電層２０を含み、導電層２０の表面には、たとえば
鉄−ニッケル合金等の磁性合金を含む磁性合金層２２が
形成される。磁性合金層２２のキュリー温度は、磁性合
金の各構成成分の配合割合により調整でき、接合時の最
適融着温度とほぼ等しくされる。磁性合金層２２の厚み
ａは、高周波電圧（２００〜４００ｋＨｚ）を印加した
ときに表皮効果によって電流が集中する領域の厚みより
やや大きくされ、導電層２０の直径ｂは、線材１８（導
電層２０および磁性合金層２２）の単位抵抗が、従来技
術における電熱線４（図５）の単位抵抗とほぼ等しくな
るように設定される。そして、線材１８の両端部には、
本体１２から突出して端子２４が設けられる。
【００１０】製造時には、線材１８を金型にコイル状に
巻回し、外型を閉じてポリエチレン等の合成樹脂を射出
する。そして、合成樹脂の硬化後、外型を開き、金型か
ら電気融着用継手１０を取り外す。なお、線材１８の全
抵抗が同サイズの継手に用いられる電熱線４（図５）の
全抵抗と等しくなるように、線材１８の巻回ピッチおよ
び長さは、電熱線４（図５）の巻回ピッチおよび長さと
等しくされる。
【００１１】融着時には、本体１２の受口１６に接合す
べきパイプ１４を挿入し、端子２４に低周波電源２６ま
たは高周波電源２８を接続し、低周波電圧（直流電圧を
含む。以下同じ）または高周波電圧を印加する。低周波
電圧を印加すると、線材１８がその合成抵抗で発熱し、
接合面が加熱され、融着される。線材１８の合成抵抗を
２．６３Ωとし、たとえば６０Ｈｚの低周波電源２６を
用いてたとえば７５Ｖの低周波電圧を端子２４間に印加
したとすると、低周波電流は図２に示す線材１８の全断
面に流れ、約２８．５Ａとなる。したがって、このとき
の発熱量は約２，１３９Ｗとなる。そのため、この場合
には、融着時間をコントロールして、最適融着状態を得
る。
【００１２】一方、高周波電圧（２００〜４００ｋＨ
ｚ）を印加すると、表皮効果によって磁性合金層２２に
電流が集中し、磁性合金層２２が急激に発熱する。磁性
合金層２２の温度が上昇してキュリー温度に達すると、
磁性合金層２２の磁性が低下して表皮効果がなくなるの
で、電流は主として抵抗の小さい導電層２０を流れるよ
うになる。したがって、磁性合金層２２はそれ以上発熱
しなくなる。磁性合金層２２の熱が本体１２やパイプ１
４に伝わって磁性合金層２２の温度が低下すると、再び
表皮効果によって磁性合金層２２が発熱する。このよう
にして、磁性合金層２２は所定のキュリー温度に保たれ
るので、接合面は、所定のキュリー温度またはその近傍
すなわち最適融着温度に加熱され、融着される。
【００１３】高周波電源２８を用いる場合、その周波数
をたとえば２００ｋＨｚとし、高周波電圧をたとえば６
６０Ｖとすると、キュリー温度に達するまでは、主とし
て磁性合金層２２に３．３Ａ程度の高周波電流が流れ
る。したがって、このときの発熱量は約２，１７８Ｗと
なる。その後キュリー温度に達すると線材１８の高周波
電流に対する合成抵抗がたとえば２０Ω程度と激減し、
発熱量は約２１８Ｗ程度に急激に小さくなり、磁性合金
層２２による自己温度制御機能が働く。したがって、部
分的に必要以上に樹脂の温度を上げすぎることによる劣
化の恐れなく、安定した融着状態を得ることができる。
【００１４】上述の実施例によれば、線材１８の全抵抗
が同サイズの継手に用いられる電熱線４（図５）の全抵
抗と等しくなるようにしているので、従来技術で用いた
のと同じ低周波電源２６を用いて、同じ条件で融着する
ことができる。なお、上述の実施例では、線材１８の単
位抵抗および長さを電熱線４（図５）の単位抵抗および
長さと等しくすることによって、線材１８の全抵抗が電
熱線４（図５）の全抵抗と等しくなるようにしている
が、電熱線４（図５）の単位抵抗と異なる単位抵抗を有
する線材１８を準備し、その巻回ピッチおよび使用長さ
を調整することによって、線材１８の全抵抗が電熱線４
（図５）の全抵抗と等しくなるようにしてもよい。
【００１５】また、上述の実施例では、導電層２０の直
径ｂによって線材１８の単位抵抗を定めるようにしてい
るが、これに代えて、またはこれと併用して、導電層２
０の各構成成分の配合割合を調整することによって線材
１８の単位抵抗を定めるようにしてもよい。さらに、こ
の実施例では、導電層２０の表面に磁性合金層２２を形
成した断面円形の線材１８を用いるようにしているが、
これに代えて、たとえば図３あるいは図４に示すよう
に、導電層２０の片面あるいは両面に磁性合金層２２を
形成した断面扁平の線材１８を用いるようにしてもよ
い。
【図面の簡単な説明】
【図１】この発明の一実施例を示す図解図である。
【図２】図１の実施例で用いられる線材を示す断面図で
ある。
【図３】図１の実施例で用いられる線材の変形例を示す
断面図である。
【図４】図１の実施例で用いられる線材の他の変形例を
示す断面図である。
【図５】従来技術を示す図解図である。
【図６】他の従来技術を示す図解図である。
【符号の説明】
１０ …電気融着用継手 １２ …本体 １６ …受口 １８ …線材 ２０ …導電層 ２２ …磁性合金層 ２４ …端子 ２６ …低周波電源 ２８ …高周波電源
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F16L 41/00 - 41/08 B29C 65/36

Claims (1)

    (57)【特許請求の範囲】
  1. 【請求項１】合成樹脂からなる本体，前記本体の接合面
    近傍に設けられる線材および前記線材の両端部に設けら
    れる２つの端子を有する電気融着用継手において、 前記線材は、導電層とその表面に形成される磁性合金層
    とを含み、前記２つの端子に低周波電圧を印加したとき
    その合成抵抗で発熱し、高周波電圧を印加したとき前記
    磁性合金層で発熱することを特徴とする、電気融着用継
    手。
JP5073408A 1993-03-31 1993-03-31 電気融着用継手 Expired - Fee Related JP2914600B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5073408A JP2914600B2 (ja) 1993-03-31 1993-03-31 電気融着用継手

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Application Number Priority Date Filing Date Title
JP5073408A JP2914600B2 (ja) 1993-03-31 1993-03-31 電気融着用継手

Publications (2)

Publication Number Publication Date
JPH06281080A JPH06281080A (ja) 1994-10-07
JP2914600B2 true JP2914600B2 (ja) 1999-07-05

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Country Link
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