JPH10281383A - Electric fusion joint - Google Patents

Electric fusion joint

Info

Publication number
JPH10281383A
JPH10281383A JP9093653A JP9365397A JPH10281383A JP H10281383 A JPH10281383 A JP H10281383A JP 9093653 A JP9093653 A JP 9093653A JP 9365397 A JP9365397 A JP 9365397A JP H10281383 A JPH10281383 A JP H10281383A
Authority
JP
Japan
Prior art keywords
electric
coupling
joint
tube
fusion
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.)
Pending
Application number
JP9093653A
Other languages
Japanese (ja)
Inventor
Nozomi Mitsusaka
望 三坂
Satoshi Shibazaki
智 芝崎
Norichika Oouchi
教親 大内
Hisashi Murata
尚志 村田
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP9093653A priority Critical patent/JPH10281383A/en
Publication of JPH10281383A publication Critical patent/JPH10281383A/en
Pending legal-status Critical Current

Links

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
    • 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
    • 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"
    • B29C65/3472—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
    • 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
    • B29C66/50—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
    • B29C66/50—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
    • 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
    • B29C66/70—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
    • 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
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Surface Heating Bodies (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an electric fusion coupling which generate no crack during its use and controls the permeation and flowing-out of gas or liquid, by installing a heat generator on the proximal area of the tube end so as to also weld the tube end of a fusion-welded resin tube. SOLUTION: A resin tube 2 is inserted into an electric fusion coupling 1 until the tube's end face touches a stopper 5 which is installed on the center of the electric welding coupling 1, current is flowed into an electric heating wire 3 which is installed near the inner surface of the electric fusion coupling 1, and the resin between the electric welding coupling 1 and the resin tube 2 which are near the electric heating wire 3 is welded and they are connected. In such an electric fusion coupling, the electric heating wire 3 is extended to the stopper 5 of the electric fusion coupling body 1, and also installed near the surface of the stopper 5 which contacts with the end face of the resin tube 2. During fusion-joining, this prevents a unfused cold zone from occurring on the end of the resin tube 2 at the center of the electric fusion coupling 1, and prevents the unjoining face between the resin tube 2 and the coupling from opening corresponding to time and generating cracks.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明はポリエチレンやポリ
ブテンなどの熱可塑性樹脂でできた樹脂管同士を接続す
ための電気融着継手に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion joint for connecting resin tubes made of a thermoplastic resin such as polyethylene or polybutene.

【０００２】[0002]

【従来の技術】最近、軽量で、耐食性に優れ、可撓性が
あるため地震に強いなどの特徴を有するポリエチレンや
ポリブテン製の樹脂管がガス管や水道管に大量に用いら
れるようになってきた。2. Description of the Related Art In recent years, resin pipes made of polyethylene or polybutene, which are lightweight, have excellent corrosion resistance, and are flexible and resistant to earthquakes, have been widely used for gas pipes and water pipes. Was.

【０００３】こうした樹脂管同士を接続する方法の１つ
に、電気融着継手を用いる方法がある。One of the methods for connecting such resin pipes is to use an electric fusion joint.

【０００４】図２に、従来のソケットタイプ電気融着継
手の１例の縦断面図を示す。図２で、１は電気融着継手
本体、２は樹脂管、３は電熱線、４は電極、５はストッ
パー、６はコールドゾーンを表す。FIG. 2 is a longitudinal sectional view showing an example of a conventional socket type electrofusion joint. In FIG. 2, 1 denotes an electrofusion joint main body, 2 denotes a resin tube, 3 denotes a heating wire, 4 denotes an electrode, 5 denotes a stopper, and 6 denotes a cold zone.

【０００５】樹脂管２を電気融着継手本体１に、樹脂管
２の先端面が電気融着継手本体１の中央部に設けられた
ストッパー５にあたるまで挿入し、電気融着継手本体１
の内面近傍に設けられた電熱線３に電極４より通電し、
電熱線３近傍にある電気融着継手本体１と樹脂管２の樹
脂を溶融させ電気融着継手本体１と樹脂管２を接合し
て、樹脂管２同士は接続される。このとき電熱線３は電
気融着継手本体１の軸方向全長にわたって配設されてな
いので、電気融着継手本体１の中央部や端部には樹脂管
と融着されてないいわゆるコールドゾーン６が存在す
る。[0005] The resin tube 2 is inserted into the electrofusion joint body 1 until the distal end surface of the resin tube 2 hits a stopper 5 provided at the center of the electrofusion joint body 1.
Is supplied from the electrode 4 to the heating wire 3 provided near the inner surface of
The resin of the electric fusion joint body 1 and the resin tube 2 near the heating wire 3 is melted, and the electric fusion joint body 1 and the resin tube 2 are joined to connect the resin tubes 2 to each other. At this time, since the heating wire 3 is not disposed over the entire length of the electrofusion joint main body 1 in the axial direction, a so-called cold zone 6 which is not fused to the resin pipe is provided at the center or the end of the electrofusion joint main body 1. Exists.

【０００６】電気融着継手で接続された樹脂管に一定圧
力でガスや水を流すと、樹脂管や継手にはクリープが起
こり、継手の中央部に存在するコールドゾーンでは樹脂
管と継手の非接合面が時間とともに開口し、その結果コ
ールドゾーンと融着部の境目に応力集中が起きて亀裂が
生じる場合がある。そのため、ＪＩＳ Ｋ６７７４には
熱間内圧クリープ試験が電気融着継手の品質管理試験項
目に取り上げられており、高い熱間内圧クリープ強度を
有する電気融着継手が望まれている。[0006] When gas or water is flowed at a constant pressure through a resin pipe connected by an electric fusion joint, creep occurs in the resin pipe and the joint, and in a cold zone existing at the center of the joint, the resin pipe and the joint are not connected. The joint surface opens with time, and as a result, stress concentration may occur at the boundary between the cold zone and the welded portion, causing a crack. Therefore, a hot internal pressure creep test is taken up as a quality control test item of an electric fusion joint in JIS K6774, and an electric fusion joint having high internal pressure creep strength is desired.

【０００７】また、継手の中央部に存在するコールドゾ
ーンでは樹脂管と継手の非接合面の間にガスや液体が浸
入できるので、流通させたガスや液体の種類によっては
この部分から継手に浸透して外部へ流出する場合もあ
る。Further, in the cold zone existing at the center of the joint, gas or liquid can enter between the resin pipe and the non-joining surface of the joint. In some cases, it flows out.

【０００８】熱間内圧クリープ強度を向上させる方法と
して、実開昭６２ー１７２８９４号公報には、軸方向全
長にわたり継手外面に形状記憶合金からなる環状体を巻
き付ける方法が提案されている。またＤｕ Ｐｏｎｔ社
製電気融着継手には、継手と樹脂管の融着部より継手中
央部側の外面上に樹脂を含浸した長繊維からなるＦＲＰ
を巻き付けたものも商品化されている。As a method for improving the creep strength under hot internal pressure, Japanese Utility Model Application Laid-Open No. Sho 62-172894 proposes a method of winding an annular body made of a shape memory alloy around the outer surface of a joint over the entire length in the axial direction. In addition, the DuPont electrofusion joint has a FRP made of a long fiber impregnated with resin on the outer surface of the joint and the resin pipe on the outer side of the joint center part side from the fusion part.
Is also commercialized.

【０００９】[0009]

【発明が解決しようとする課題】しかしながら、実開昭
６２ー１７２８９４号公報に記載の方法やＤｕ Ｐｏｎ
ｔ社製電気融着継手のように、継手を外面側から補強し
ても、剛性の小さい熱可塑性樹脂は内圧によって管軸方
向に伸び肉厚方向に縮まるポアソン効果が大きいので、
継手内面の変形を完全に抑えることができず、コールド
ゾーンと融着部の境目に発生する亀裂を完全には防止で
きない。However, the method described in Japanese Utility Model Application Laid-Open No. Sho 62-172894 and the method disclosed in
Even if the joint is reinforced from the outer surface side, as in the case of an electro-fusion joint manufactured by t Co., since the thermoplastic resin with low rigidity has a large Poisson effect that expands in the tube axis direction by internal pressure and shrinks in the thickness direction,
The deformation of the inner surface of the joint cannot be completely suppressed, and the crack generated at the boundary between the cold zone and the fused portion cannot be completely prevented.

【００１０】また、いずれの方法も、コールドゾーンに
おける樹脂管と継手の非接合面の間にガスや液体が浸入
できるので、ガスや液体の浸透流出の防止効果はない。In any of the methods, gas or liquid can enter between the resin tube and the non-joining surface of the joint in the cold zone, and therefore, there is no effect of preventing the gas and liquid from permeating and flowing out.

【００１１】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、使用中に亀裂が発生することなく、し
かもガスや液体の浸透流出を抑制できる電気融着継手を
提供することを目的とする。The present invention has been made in order to solve such a problem, and an object of the present invention is to provide an electro-fusion joint which does not generate a crack during use and can suppress permeation and outflow of gas or liquid. And

【００１２】[0012]

【課題を解決するための手段】上記課題は、融着接合さ
れる樹脂管の管端部も融着されるように発熱体が管端部
近傍域に配設されていることを特徴とする電気融着継手
により解決される。The above object is characterized in that a heating element is disposed in the vicinity of the end of the resin tube so that the end of the resin tube to be fusion-spliced is also fused. It is solved by an electric fusion joint.

【００１３】電気融着継手の発熱体を、融着接合される
樹脂管の管端部も融着されるように配設して融着を行え
ば、継手の中央部における樹脂管端部の非融着のコール
ドゾーンがなくなるので、クリープによる亀裂の発生を
防止できる。If the heating element of the electric fusion joint is arranged so that the tube end of the resin tube to be fusion-bonded is also fused, and fusion is performed, the resin tube end at the center of the joint is formed. Since there is no non-fused cold zone, it is possible to prevent the occurrence of cracks due to creep.

【００１４】また、樹脂管と継手の融着により継手の中
央部の肉厚を増大できるので、ガスや液体の浸透流出を
抑制できる。Further, since the thickness of the central portion of the joint can be increased by fusing the resin pipe and the joint, the permeation and outflow of gas or liquid can be suppressed.

【００１５】管端部近傍域とは、発熱体の存在により加
熱溶融接続領域が管端部にまで及ぶ箇所までを意味し、
融着条件等によりその位置が異なる事は言うまでもな
い。The region near the pipe end means a region where the heat fusion connection region extends to the tube end due to the presence of the heating element.
It goes without saying that the position is different depending on the fusion conditions and the like.

【００１６】さらに、発熱体はニクロム線等の電熱線や
炭素繊維等の導電性、誘導加熱発熱体があり、通常は電
熱線が好ましく使われる。Further, the heating element includes a heating wire such as a nichrome wire or a conductive heating material such as carbon fiber or an induction heating heating element. Usually, the heating wire is preferably used.

【００１７】[0017]

【発明の実施の形態】図１に、本発明の電気融着継手の
１実施の形態の縦断面図を示す。図１の番号は図２の番
号と同じものを表す。FIG. 1 is a longitudinal sectional view showing one embodiment of an electrofusion joint according to the present invention. The numbers in FIG. 1 represent the same as those in FIG.

【００１８】図２に示す電熱線３の配設を、電気融着継
手本体１のストッパー５まで延長し、さらに樹脂管２の
端面に接触するストッパー５の面近傍にも設けて融着接
合すれば、電気融着継手本体１の中心部における樹脂管
端部の非融着のコールドゾーンは生じない。したがっ
て、樹脂管と継手の非接合面が時間とともに開口して亀
裂が生じこともない。The arrangement of the heating wire 3 shown in FIG. 2 is extended to the stopper 5 of the electric fusion joint main body 1 and further provided near the surface of the stopper 5 which contacts the end face of the resin pipe 2 for fusion bonding. If this is the case, a non-fused cold zone at the end of the resin pipe at the center of the electrofusion joint body 1 does not occur. Therefore, the non-joining surface between the resin pipe and the joint does not open with time and does not crack.

【００１９】また、電気融着継手本体１の中心部の肉厚
は、継手と樹脂管の厚みの和となりガスや液体の浸透流
出に要する時間を長くできる、すなわち浸透流出を抑制
できることになる。The thickness of the central portion of the electrofusion joint main body 1 is the sum of the thicknesses of the joint and the resin pipe, so that the time required for gas and liquid permeation and outflow can be lengthened, that is, permeation and outflow can be suppressed.

【００２０】[0020]

【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、使用中に亀裂が発生することなく、しかもガ
スや液体の浸透流出を抑制できる電気融着継手を提供で
きる。Since the present invention is constructed as described above, it is possible to provide an electrofusion joint which does not generate cracks during use and can suppress permeation and outflow of gas and liquid.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の電気融着継手の１実施の形態の縦断面
図である。FIG. 1 is a longitudinal sectional view of one embodiment of an electric fusion joint of the present invention.

【図２】従来のソケットタイプ電気融着継手の１例の縦
断面図である。FIG. 2 is a longitudinal sectional view of an example of a conventional socket type electric fusion joint.

【符号の説明】[Explanation of symbols]

１ 電気融着継手本体 ２ 樹脂管 ３ 電熱線（発熱体） ４ 電極 ５ ストッパー ６ コールドゾーン DESCRIPTION OF SYMBOLS 1 Electric fusion joint main body 2 Resin tube 3 Heating wire (heating element) 4 Electrode 5 Stopper 6 Cold zone

───────────────────────────────────────────────────── フロントページの続き (72)発明者 村田 尚志 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Naoshi Murata 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 融着接合される樹脂管の管端部も融着さ
れるように発熱体が管端部近傍域に配設されていること
を特徴とする電気融着継手。1. An electric fusion joint, wherein a heating element is arranged in a region near a tube end so that a tube end of a resin tube to be fusion-bonded is also fused.
JP9093653A 1997-04-11 1997-04-11 Electric fusion joint Pending JPH10281383A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9093653A JPH10281383A (en) 1997-04-11 1997-04-11 Electric fusion joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9093653A JPH10281383A (en) 1997-04-11 1997-04-11 Electric fusion joint

Publications (1)

Publication Number Publication Date
JPH10281383A true JPH10281383A (en) 1998-10-23

Family

ID=14088350

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9093653A Pending JPH10281383A (en) 1997-04-11 1997-04-11 Electric fusion joint

Country Status (1)

Country Link
JP (1) JPH10281383A (en)

Cited By (16)

* Cited by examiner, † Cited by third party
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EP1105286A4 (en) * 1998-07-10 2002-07-10 Edison Welding Inst STEP-BY-STEP JOINT CONNECTIONS
KR20030042773A (en) * 2001-11-23 2003-06-02 이정현 Manufacturing method and structure of resin pipe connection socket using flexible pipe
FR2853861A1 (en) * 2003-04-15 2004-10-22 Volkswagen Ag FUEL TANK SYSTEM AND METHOD FOR MANUFACTURING FUEL TANK SYSTEM
WO2009033603A1 (en) * 2007-09-07 2009-03-19 Egeplast Werner Strumann Gmbh & Co. Kg Method for welding plastic pipes together
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US6596122B1 (en) 1998-07-10 2003-07-22 Edison Welding Institute, Inc. Simultaneous butt and lap joints
EP1105286A4 (en) * 1998-07-10 2002-07-10 Edison Welding Inst STEP-BY-STEP JOINT CONNECTIONS
KR20030042773A (en) * 2001-11-23 2003-06-02 이정현 Manufacturing method and structure of resin pipe connection socket using flexible pipe
DE10317407B4 (en) * 2003-04-15 2016-03-17 Volkswagen Ag Method for producing a fuel tank system
FR2853861A1 (en) * 2003-04-15 2004-10-22 Volkswagen Ag FUEL TANK SYSTEM AND METHOD FOR MANUFACTURING FUEL TANK SYSTEM
WO2009033603A1 (en) * 2007-09-07 2009-03-19 Egeplast Werner Strumann Gmbh & Co. Kg Method for welding plastic pipes together
US11229913B2 (en) 2013-06-03 2022-01-25 Biolife Solutions, Inc. Cryogenic systems
JP2020091004A (en) * 2018-12-06 2020-06-11 積水化学工業株式会社 Electric fusion joint, plant piping, and fusion method
WO2021065776A1 (en) * 2019-09-30 2021-04-08 積水化学工業株式会社 Electrically fusion bonded joint
JPWO2021065776A1 (en) * 2019-09-30 2021-04-08
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US12259076B2 (en) 2019-09-30 2025-03-25 Sekisui Chemical Co., Ltd. Electrofusion joint
TWI886150B (en) * 2019-09-30 2025-06-11 日商積水化學工業股份有限公司 Electric fusion joint and connection method
US12459212B2 (en) 2020-01-24 2025-11-04 Sekisui Chemical Co., Ltd. Electrofusion joint and fusion method
TWI907379B (en) * 2020-01-24 2025-12-11 日商積水化學工業股份有限公司 Electrofusion joints, manufacturing methods and connection methods of electrofusion joints
US11794418B2 (en) 2020-07-20 2023-10-24 Saudi Arabian Oil Company Apparatus and method for threaded-welded reinforced thermosetting resin pipe joints
US11761571B2 (en) 2020-07-20 2023-09-19 Saudi Arabian Oil Company Apparatus and method for electrofusion welding of reinforced thermosetting resin pipe joints
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