JP2721465B2 - Electric fusion plastic pipe fittings - Google Patents

Electric fusion plastic pipe fittings

Info

Publication number
JP2721465B2
JP2721465B2 JP4330289A JP33028992A JP2721465B2 JP 2721465 B2 JP2721465 B2 JP 2721465B2 JP 4330289 A JP4330289 A JP 4330289A JP 33028992 A JP33028992 A JP 33028992A JP 2721465 B2 JP2721465 B2 JP 2721465B2
Authority
JP
Japan
Prior art keywords
pipe joint
pipe
heating wire
resin
connector pins
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 - Lifetime
Application number
JP4330289A
Other languages
Japanese (ja)
Other versions
JPH05256392A (en
Inventor
孝 穴水
三郎 秋山
健 加藤
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.)
Tokyo Gas Co Ltd
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
Tokyo Gas Co 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 Hitachi Metals Ltd, Tokyo Gas Co Ltd filed Critical Hitachi Metals Ltd
Publication of JPH05256392A publication Critical patent/JPH05256392A/en
Application granted granted Critical
Publication of JP2721465B2 publication Critical patent/JP2721465B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B29D23/003—Pipe joints, e.g. straight joints
    • B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
    • 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"
    • B29C65/3404—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
    • B29C65/3432—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 comprising several wires, e.g. in the form of several independent windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • B29C66/3472—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in the plane of the joint
    • 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
    • B29C66/5223—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces
    • B29C66/52231—Joining tubular articles for forming corner connections or elbows, e.g. for making V-shaped pieces with a right angle, e.g. for making L-shaped pieces
    • 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
    • B29C66/52298—Joining tubular articles involving the use of a socket said socket being composed by several elements
    • 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
    • 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
    • B29C66/70—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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/24—Pipe joints or couplings
    • B29L2031/243—Elbows

Landscapes

  • 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)

Abstract

PURPOSE:To prevent damage due to unnecessary heating, use an inner cylindrical member commonly, and facilitate production by providing the inner cylindrical member made of thermalplastic resin on which an electric heater wire is wound on the inner peripheral surface of a pipe fitting zone at the end of a pipe joint, and connecting the electric heater wire at the outside of the pipe joint. CONSTITUTION:A connecting member 10 is made by injection-molding an outer cylindrical member 13 on the outer surface of an inner cylindrical member 12 on which one line of electric heater wire 11 is wound, and resin pipes 21 and 22 are installed in the inner surface of it. The inner cylindrical member 12 is made of a thermoplastic resin such as polyethylene, etc., and its outer surface is provided with spiral grooves 14 for receiving the electric heater wire 11. The connecting member 10 and an intermediate member 20 are heated by another heating panel, etc., and, when each end of them becomes fused, the both ends are pressed each other quickly to thermal-fuse together. The connecting members 10 and 10 on each end is provided with two connector pins 15 and 16. Each one of the connector pins 16 and 16 is connected together by a covered lead 3 on the outer surface of the pipe joint. As a result, the connecting member 10 and inner cylindrical member 12 can be used commonly.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は熱可塑性樹脂管を接続す
るために管継手の内面側に電熱線を埋設した電気融着式
プラスチック管継手に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion type plastic pipe joint in which a heating wire is buried on the inner surface side of a pipe joint for connecting a thermoplastic resin pipe.

【０００２】[0002]

【従来の技術】従来、特開昭５７−６９０１５号公報で
開示された図４に示す電気融着式プラスチック管継手が
ある。このものは一端から他端に亘って外表面に溝を有
し、溝の底部と内面との壁厚さを軸方向中央側に向かっ
て順次増加するように設けた内方部材の溝に電熱線を設
け、この内方部材と電熱線を外方部材で包囲した電気融
着式プラスチック管継手である。2. Description of the Related Art Conventionally, there is an electrofusion type plastic pipe joint shown in FIG. 4 disclosed in Japanese Patent Application Laid-Open No. 57-69015. This has a groove on the outer surface from one end to the other end, and has a groove in the inner member provided so that the wall thickness between the bottom and the inner surface of the groove is gradually increased toward the center in the axial direction. This is an electrofusion type plastic pipe joint in which a heating wire is provided, and the inner member and the heating wire are surrounded by an outer member.

【０００３】[0003]

【発明が解決しようとする課題】上記従来技術は、管継
手本体を形成する外方部材の軸方向の長さとほぼ同じ内
方部材を設け、この内方部材は軸方向の中央部分におい
てより大きな内面との壁厚さを有しており、樹脂管の管
継手内への完全な装着なしに電熱線が加熱することによ
って生ずる管継手の損傷を防止するものである。しかる
に電熱線は管継手の中央部分で溝の底部と内包部材の内
面間との壁厚さが増加しているため、継手内面側への電
熱線の加熱による影響は、中央部の壁厚さが増した部分
で少なくなるが、樹脂管が管継手内へ完全に装着された
場合の加熱の影響も装着した樹脂管の端部側で少なくな
り、完全な装着状態でも樹脂管との溶融接合が樹脂管の
装着域で均一に行われない部分が生じる。In the above prior art, an inner member having an axial length substantially equal to that of an outer member forming a pipe joint body is provided, and the inner member is larger at an axial center portion. It has a wall thickness with the inner surface, and prevents damage to the fitting caused by heating of the heating wire without completely fitting the resin pipe into the fitting. However, since the heating wire has an increased wall thickness between the bottom of the groove and the inner surface of the inner enclosing member at the center of the pipe joint, the effect of heating the heating wire on the inner surface of the joint depends on the wall thickness at the center. However, the effect of heating when the resin pipe is completely installed in the pipe joint also decreases at the end of the installed resin pipe, and it is melt-bonded to the resin pipe even when it is completely installed. Occurs in the area where the resin tube is not uniformly installed.

【０００４】また管継手の一端から他端に亘って電熱線
が埋設されており、樹脂管を装着しない中央部でも管継
手の内部で溶融が行われ、管継手にとって好ましくな
い。更に前記内方部材は、ソケット、エルボ、チーズ等
各々の継手形状に見合う形状の薄肉内方部材が必要で、
またこの内包部材の溝に電熱線を設けなければならず、
内方部材の成型上金型内で溶融樹脂が行き渡りにくく、
また内包部材に電熱線を巻線する工程作業上大形になる
程困難を要し、製造上問題が多かった。本発明は上記の
課題を解消して、管継手本体内に樹脂管を装着した樹脂
管装着領域にのみ電熱線で管継手の内面を加熱させて装
着した樹脂管と溶融接合し、また樹脂管を装着しない管
継手本体内の領域は全く加熱させず、したがって管継手
と樹脂管との溶融接合を確実なものとし、そして加熱に
よる管継手本体への悪影響をなくすとともに、管継手の
製造が容易になる電気融着式プラスチック管継手を提供
するものである。Further, a heating wire is buried from one end to the other end of the pipe joint, and melting is performed inside the pipe joint even in a central portion where the resin pipe is not mounted, which is not preferable for the pipe joint. Further, the inner member requires a thin inner member having a shape corresponding to the joint shape of each socket, elbow, cheese, etc.
In addition, a heating wire must be provided in the groove of this internal member,
Due to the molding of the inner member, the molten resin is difficult to spread inside the mold,
In addition, the larger the size of the process for winding the heating wire around the inner enclosing member, the more difficult the process becomes, and there are many manufacturing problems. The present invention solves the above-mentioned problems, and heats the inner surface of the pipe joint with a heating wire only in the resin pipe mounting area where the resin pipe is mounted in the pipe joint body, and melt-bonds the resin pipe to the mounted resin pipe. The area inside the pipe joint body where no pipe is installed is not heated at all, so that the fusion joint between the pipe joint and the resin pipe is ensured, and the adverse effect on the pipe joint body due to heating is eliminated, and the manufacture of the pipe joint is easy. The present invention provides an electric fusion-type plastic pipe joint.

【０００５】[0005]

【課題を解決するための手段】本発明の要旨は、薄肉筒
状の外周面に電熱線を巻き回し該電熱線の両端は前記薄
肉筒状外面に装着した一対のコネクターピンに接続して
なる熱可塑性樹脂製の内筒部材と、該内筒部材の外面に
熱可塑性樹脂を射出成形した外筒部材とよりなる管継手
であって、該管継手の両端部内面に熱可塑性樹脂管を挿
入し、前記管継手の外面に突出するコネクターピンに通
電して前記電熱線を加熱させ、前記樹脂管と融着する電
気融着式管継手において、前記管継手の樹脂管を挿入す
る両端部内周側の夫々の管装着域に対応して夫々前記内
筒部材を設け、該各内筒部材の一対のコネクターピンの
内の片方同志を管継手の外面で導電線を用いて接続して
前記各内筒部材の電熱線を電気的に直列接続し、前記各
内筒部材のコネクターピンの内の他方のコネクターピン
より各内筒部材の電熱線に通電することを特徴とする電
気融着式プラスチック管継手である。上記において、前
記管継手の外面で各内筒部材のコネクターピンの片方同
志を導電線で接続した接続部の上に熱可塑性樹脂製のカ
バーを被せて管継手外面との間で密封したことを特徴と
するものである。The gist of the present invention is that a heating wire is wound around an outer peripheral surface of a thin-walled tube, and both ends of the heating wire are connected to a pair of connector pins mounted on the outer surface of the thin-walled tube. A pipe joint consisting of an inner cylinder member made of a thermoplastic resin and an outer cylinder member obtained by injection molding a thermoplastic resin on the outer surface of the inner cylinder member, wherein a thermoplastic resin pipe is inserted into the inner surfaces of both ends of the pipe joint. Then, in the electro-fusion type pipe joint which heats the heating wire by applying a current to a connector pin protruding from the outer surface of the pipe joint and fuses the resin pipe with the resin pipe, the inner periphery of both ends where the resin pipe of the pipe joint is inserted. The inner cylinder members are provided corresponding to the respective pipe mounting areas on the side, and one of the pair of connector pins of each inner cylinder member is connected to each other by using a conductive wire on the outer surface of the pipe joint. The heating wires of the inner cylinder member are electrically connected in series, and the connection of each inner cylinder member is performed. Is an electric fusion type plastic pipe joint, characterized by energizing than the other connector pins of the Pin to the heating wire of the inner tubular member. In the above, it is considered that one end of the connector pin of each inner cylindrical member is covered with a thermoplastic resin cover on the connection portion where one of the connector pins of each inner cylinder member is connected by a conductive wire on the outer surface of the pipe joint, and is sealed between the outer surface of the pipe joint. It is a feature.

【０００６】[0006]

【作用】本発明は上記の構成であるから、管継手への樹
脂管の装着域にのみ内筒部材が配置され、したがって管
の装着域にのみ電熱線が埋設されており、管の装着域を
除く部材には電熱線が埋設されてない。したがって電熱
線による加熱は、樹脂管との溶融接続にのみ有効に利用
され、また電熱線の加熱による管継手本体への悪影響を
防止する。また継手の製造上においても、継手の形状に
関係なく接続する樹脂管の口径に応じた内筒部材を共通
して用いることができる。このため、形状の異なる継手
や口径が異なる継手の製造においても、電熱線の埋設が
ない部材を用いて熱融着したり、又は内筒部材の外面に
外筒部材を一体に成型することによって管継手の製造が
容易に行える。また樹脂管との接続作業においても、管
継手の埋設された電熱線に同時に通電して接続作業が行
えるため、接続作業が短時間に且つ容易に行える。また
接続部をカバーによって管継手の表面で密封してあるの
で、管と接続中に土壌や水と触れて電気的な問題を起こ
す恐れがなく、良好な接続作業が行なえる。According to the present invention having the above construction, the inner cylinder member is disposed only in the area where the resin pipe is mounted on the pipe joint. Therefore, the heating wire is embedded only in the area where the pipe is mounted. Heating wires are not embedded in the members except for. Therefore, the heating by the heating wire is effectively used only for the fusion connection with the resin pipe, and also prevents the adverse effect on the pipe joint body due to the heating of the heating wire. Also in the manufacture of the joint, an inner cylindrical member corresponding to the diameter of the resin pipe to be connected can be commonly used regardless of the shape of the joint. For this reason, even in the manufacture of joints having different shapes and different diameters, by heat-sealing using a member having no embedded heating wire, or by integrally molding the outer cylinder member on the outer surface of the inner cylinder member. Manufacture of pipe joints can be easily performed. Also, in the connection work with the resin pipe, the connection work can be performed by energizing the heating wire embedded in the pipe joint at the same time, so that the connection work can be performed easily in a short time. In addition, since the connecting portion is sealed with the surface of the pipe joint by the cover, there is no danger of causing electrical problems due to contact with soil or water during connection with the pipe, and a good connecting operation can be performed.

【０００７】[0007]

【実施例】図１は本発明の一実施例を示す電気融着式の
プラスチック管継手１である。図において２０は本実施
例の管継手の中央部を形成する熱可塑性樹脂で設けた筒
状の中間部材で、図ではエルボ形をしているが各種の管
継手の形状に応じてソケット形でもチ−ズ形でも同様で
ある。この中間部材２０は樹脂管２１、２２の装着域を
除く部分を形成しており、予め射出成型で形成してもよ
く、また後述する様に内筒部材１２、１２の製造後、内
筒部材１２と一体的に射出成型で形成しても良い。1 shows an electric fusion type plastic pipe joint 1 according to an embodiment of the present invention. In the figure, reference numeral 20 denotes a cylindrical intermediate member provided with a thermoplastic resin forming a central portion of the pipe joint of the present embodiment, which has an elbow shape in the figure, but may have a socket type depending on the shape of various pipe joints. The same applies to the tooth type. The intermediate member 20 forms a portion excluding the mounting area of the resin pipes 21 and 22, and may be formed by injection molding in advance. 12 and may be formed by injection molding.

【０００８】接続部材１０は一系統の電熱線１１を巻線
した内筒部材１２の外面に外筒部材１３を金型内で射出
成型して設けたもので、この内面に接続する樹脂管２
１、２２が装着される。内筒部材１２はポリエチレン等
の熱可塑性樹脂からなる薄肉円筒状で、内面は接続する
熱可塑性樹脂管を受け入れる内径を有し、外面は電熱線
１１を受け入れる螺旋の溝１４を有す。溝１４にはステ
ンレス、銅等の抵抗加熱が行われる電熱線１１を巻いて
あり、内筒部材１２の両端外面に設置したコネクタ−ピ
ン１５、１６に電熱線１１の両端を連結してある。[0008] The connecting member 10 is formed by injection-molding an outer cylindrical member 13 in a mold on the outer surface of an inner cylindrical member 12 on which a heating wire 11 of one system is wound, and a resin pipe 2 connected to the inner surface.
1, 22 are mounted. The inner cylindrical member 12 has a thin cylindrical shape made of a thermoplastic resin such as polyethylene. The inner surface has an inner diameter for receiving a thermoplastic resin tube to be connected, and the outer surface has a spiral groove 14 for receiving the heating wire 11. A heating wire 11 made of stainless steel, copper or the like for resistance heating is wound in the groove 14, and both ends of the heating wire 11 are connected to connector pins 15, 16 provided on outer surfaces of both ends of the inner cylindrical member 12.

【０００９】樹脂管２１、２２を管継手１内へ装着する
装着域に設けた接続部材１０には一系統の電熱線１１が
埋設されており、樹脂管２１、２２が装着されない中央
部分は上記中間部材２０で設けられている。この両者は
例えば互いに向かい合う両端面を別の加熱盤等で加熱
し、各々の端面が溶融状態に達したら加熱盤を取り外
し、両端面を素早く押し付ける。これによって中間部材
２０の端部側に接続部材１０が一体的に熱融着される。
各端部側の接続部材１０、１０には各々２本のコネクタ
−ピン１５、１６が突き出しており、この内各一本のコ
ネクタ−ピン同志１６、１６を被覆導線３によって管継
手の外面で結線してある。尚、被覆導線３の外面には熱
可塑性樹脂で作ったカバーを被せて、カバーの周囲を管
継手の表面と熱融着して一体に接合し、接続結線部を外
部の環境と完全に遮断してある。接続部材１０は樹脂管
２１、２２の装着域にのみ設けられるから接続する樹脂
管２１、２２の口径に応じたものを用意するだけでよ
く、従って管継手１全体の形状のものを用意する必要が
なく、同じ管口径サイズでの接続部材１０、及び内筒部
材１２の共通化が計れる。A heating wire 11 of one system is embedded in a connecting member 10 provided in a mounting area where the resin pipes 21 and 22 are mounted in the pipe joint 1, and a central portion where the resin pipes 21 and 22 are not mounted is the above-described central portion. An intermediate member 20 is provided. For example, the two ends are heated, for example, at both end surfaces facing each other with another heating plate or the like, and when each end surface reaches a molten state, the heating plate is removed and both end surfaces are quickly pressed. Thereby, the connecting member 10 is integrally heat-fused to the end side of the intermediate member 20.
Two connector pins 15, 16 protrude from each of the connection members 10, 10 on each end side, and one of the connector pins 16, 16 is connected to the outer surface of the pipe joint by the insulated wire 3 in each case. It is connected. A cover made of a thermoplastic resin is placed over the outer surface of the insulated conductor 3, and the periphery of the cover is heat-sealed to the surface of the pipe joint to be integrally joined, and the connection connection portion is completely shut off from the external environment. I have. Since the connecting member 10 is provided only in the area where the resin pipes 21 and 22 are mounted, it is only necessary to prepare one according to the diameter of the resin pipes 21 and 22 to be connected. Therefore, the connection member 10 and the inner cylindrical member 12 having the same pipe diameter can be shared.

【００１０】中間部材２０と接続部材１０との一体化は
上記のごとく熱融着してもよく、また別の実施例として
図２に示すごとく、中間部材７０の内面に歯形溝７１を
設け、この歯形溝７１に接続部材４０のスリ−ブ４５を
パッキン７３を介して嵌合し、嵌合した内面側に銅管等
の金属製ステイフナ−４１を装着してこのステイフナ−
４１を拡径し、中間部材７０と接続部材４０を密封状態
で一体化しても良い。また上記歯形溝７１に代えて互い
に螺合するねじを設け、中間部材７０と接続部材４０と
を密封状態で螺合し一体化しても良い。なお一体化した
後、両端接続部材４０、４０のコネクタ−ピン１６、１
６が被覆導線３によって結線される。この場合も被覆導
線３による結線部には上記したごとく、管継手の表面に
カバーを接合して接続結線部を密封し、外部環境から遮
断している。The intermediate member 20 and the connecting member 10 may be integrated by heat fusion as described above. As another embodiment, as shown in FIG. 2, a tooth-shaped groove 71 is provided on the inner surface of the intermediate member 70. The sleeve 45 of the connection member 40 is fitted into the toothed groove 71 via the packing 73, and a metal stiffener 41 such as a copper tube is mounted on the fitted inner surface side.
41 may be enlarged, and the intermediate member 70 and the connecting member 40 may be integrated in a sealed state. Further, instead of the tooth-shaped groove 71, a screw which is screwed together may be provided, and the intermediate member 70 and the connecting member 40 may be screwed and integrated in a sealed state. After the integration, the connector-pins 16, 1
6 are connected by the covered conductor 3. Also in this case, as described above, the connection portion by the covered conductor 3 is joined with a cover on the surface of the pipe joint to seal the connection connection portion, thereby shielding the connection connection portion from the external environment.

【００１１】更に図３は別の実施例を説明する断面図で
ある。射出成形機の金型６０はキャビテイ−６１を有す
２つ割りからなっており、キャビテイ−６１中にはマン
ドレル６２、６３を装着してある。マンドレル６２、６
３には前記電熱線１１を巻き回した内筒部材１２、１２
を各々のマンドレル６２、６３に装着してある。コネク
タ−ピン１５、１６は金型６０で固定されており動かな
い様になっている。この状態で射出成形機の射出筒より
溶融状態のポリエチレン等の熱可塑性溶融樹脂をランナ
−６４より射出して、キャビテイ−６１中の内面と電熱
線を巻き回した内筒部材１２、１２の外面との間に外筒
部材１７を成形する。射出した外筒部材１７の溶融樹脂
によって、内筒部材１２、１２の各外面は外筒部材１７
と一体的に熱融着接合され、各コネクタ−ピン１５、１
６が外筒部材１７の外面に突き出して一体化される。こ
のようにして成型した後、上記コネクタ−ピン１６、１
６を管継手の外部で接続し、電気融着式のプラスチック
管継手１が形成される。FIG. 3 is a sectional view for explaining another embodiment. The mold 60 of the injection molding machine is divided into two parts having a cavity 61, and mandrels 62 and 63 are mounted in the cavity 61. Mandrel 62, 6
Reference numeral 3 denotes inner cylindrical members 12 and 12 around which the heating wire 11 is wound.
Is attached to each mandrel 62, 63. The connector pins 15, 16 are fixed by a mold 60 so as not to move. In this state, a molten thermoplastic resin such as polyethylene is injected from the injection cylinder of the injection molding machine from the runner-64 from the runner-64, and the inner surface in the cavity 61 and the outer surface of the inner cylindrical members 12, 12 around which the heating wire is wound. The outer cylinder member 17 is formed between the steps. Due to the molten resin injected from the outer cylinder member 17, the outer surfaces of the inner cylinder members 12, 12
Heat-bonded integrally with each other, and each connector-pin 15, 1
6 protrudes from the outer surface of the outer cylinder member 17 and is integrated therewith. After molding in this manner, the connector-pins 16, 1
6 are connected outside the pipe joint to form the plastic pipe joint 1 of the electrofusion type.

【００１２】樹脂管との接続に当たっては、図１に示す
ように管継手１の両端部内面側に接続する樹脂管２１、
２２を挿入した後、管継手１の両端部外面に突き出した
各コネクタ−ピン１５、１６にコントロ−ラ−３０から
の電力を付与する。コントロ−ラからの電力は一方の電
熱線１１から被覆導線３を介して他方の電熱線１１に通
電される。電熱線１１は管継手の樹脂管２１、２１を装
着する部分にのみ埋設されているため、装着した樹脂管
２１、２２の外周面を加熱し、効率よくコントロ−ラ−
３０からの電力が費やされる。なお上記各コネクタ−ピ
ン１５、１６は管継手の外面で互いに並列に接続して、
コントロ−ラからの電力を各電熱線１１に付与するよう
にしても良い。In connection with the resin pipe, as shown in FIG. 1, a resin pipe 21 connected to the inner surfaces of both ends of the pipe joint 1 is provided.
After the insertion of the connector 22, power from the controller 30 is applied to the connector pins 15, 16 protruding from the outer surfaces of both ends of the pipe joint 1. Electric power from the controller is supplied from one heating wire 11 to the other heating wire 11 via the coated conductor 3. Since the heating wire 11 is buried only in the part of the pipe joint where the resin pipes 21 and 21 are mounted, the outer peripheral surfaces of the mounted resin pipes 21 and 22 are heated and the controller is efficiently controlled.
Power from 30 is spent. The connector pins 15, 16 are connected in parallel on the outer surface of the pipe joint,
Power from the controller may be applied to each heating wire 11.

【００１３】[0013]

【発明の効果】以上説明のごとく本発明の電気融着式プ
ラスチック管継手は、接続する樹脂管の装着域を除く部
分で電熱線が埋設されてなく、加熱が行われないから、
電熱線による加熱エネルギ−は樹脂管との溶融接続にの
み効率よく有効に利用される。また管継手内の余分な部
分を加熱しないから、管継手内での不要な加熱による損
傷を防止する。また同じ管口径サイズでの内筒部材の共
通化が計れるので、従来のごとく各種継手形状毎の内筒
部材を設ける必要がなく、更に各種形状や異なる口径の
継手の製造もそれに応じた中間部材を設けるだけで容易
に行なえる。更に接続部は外部と遮断されるので電気的
な問題が生じなく、良好な接続が行なえる。As described above, in the electro-fusion type plastic pipe joint of the present invention, since the heating wire is not buried in the portion other than the mounting area of the resin pipe to be connected, and the heating is not performed,
The heating energy by the heating wire is efficiently and effectively used only for the fusion connection with the resin pipe. Further, since an unnecessary portion in the pipe joint is not heated, damage due to unnecessary heating in the pipe joint is prevented. In addition, since it is possible to standardize the inner cylinder member with the same pipe diameter size, there is no need to provide an inner cylinder member for each joint shape as in the conventional case, and furthermore, the production of joints of various shapes and different diameters is also an intermediate member corresponding thereto. Can be easily achieved simply by providing Further, since the connection portion is cut off from the outside, no electrical problem occurs and a good connection can be made.

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

【図１】本発明の一実施例を示す電気融着式プラスチッ
ク管継手の断面図。FIG. 1 is a cross-sectional view of an electrofusion-type plastic pipe joint showing one embodiment of the present invention.

【図２】別の実施例のプラスチック管継手の断面図。FIG. 2 is a sectional view of a plastic pipe joint according to another embodiment.

【図３】別の実施例のプラスチック管継手を製造する方
法を説明する断面図。FIG. 3 is a sectional view illustrating a method of manufacturing a plastic pipe joint according to another embodiment.

【図４】従来技術を示すプラスチック管継手の部分断面
図。FIG. 4 is a partial cross-sectional view of a plastic pipe joint showing a conventional technique.

【符号の説明】[Explanation of symbols]

１ 電気融着式プラスチック管継手 ３ 被覆導線 １０、４０、５０ 接続部材 １１ 電熱線 １２ 内筒部材 １３、１７ 外筒部材 １４ 溝 １５、１６ コネクターピン ２０、７０ 中間部材 ３０ コントロ−ラ ４１ スリ−ブ ４５ ステイフナ− ６０ 金型 ６１ キャビテイ− ６２、６３ マンドレル ６４ ランナ− DESCRIPTION OF SYMBOLS 1 Electric fusion-type plastic pipe joint 3 Insulated lead wire 10, 40, 50 Connection member 11 Heating wire 12 Inner cylinder member 13, 17 Outer cylinder member 14 Groove 15, 16 Connector pin 20, 70 Intermediate member 30 Controller 41 Three B 45 Stiffener 60 Die 61 Cavity 62, 63 Mandrel 64 Runner

フロントページの続き (72)発明者 加藤 健 三重県桑名市大福２番地日立金属株式会 社桑名工場内 (56)参考文献 特開 平１−158288（ＪＰ，Ａ)Continuation of the front page (72) Inventor Ken Kato 2 Daifuku, Kuwana-shi, Mie Prefecture Inside the Kuwana Plant of Hitachi Metals Co., Ltd. (56) References JP-A-1-158288 (JP, A)

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 薄肉筒状の外周面に電熱線を巻き回し該
電熱線の両端は前記薄肉筒状外面に装着した一対のコネ
クターピンに接続してなる熱可塑性樹脂製の内筒部材
と、該内筒部材の外面に熱可塑性樹脂を射出成形した外
筒部材とよりなる管継手であって、該管継手の両端部内
面に熱可塑性樹脂管を挿入し、前記管継手の外面に突出
するコネクターピンに通電して前記電熱線を加熱させ、
前記樹脂管と融着する電気融着式管継手において、 前記管継手の樹脂管を挿入する両端部内周側の夫々の管
装着域に対応して夫々前記内筒部材を設け、該各内筒部
材の一対のコネクターピンの内の片方同志を管継手の外
面で導電線を用いて接続して前記各内筒部材の電熱線を
電気的に直列接続し、前記各内筒部材のコネクターピン
の内の他方のコネクターピンより各内筒部材の電熱線に
通電することを特徴とする電気融着式プラスチック管継
手。An inner cylindrical member made of a thermoplastic resin, wherein a heating wire is wound around an outer peripheral surface of the thin cylindrical tube, and both ends of the heating wire are connected to a pair of connector pins mounted on the outer surface of the thin cylindrical tube; A pipe joint comprising an outer cylinder member obtained by injection-molding a thermoplastic resin on an outer surface of the inner cylinder member. A thermoplastic resin pipe is inserted into inner surfaces of both ends of the pipe joint, and protrudes from an outer surface of the pipe joint. Energize the connector pins to heat the heating wire,
In the electro-fusion type pipe joint to be fused with the resin pipe, the inner pipe members are respectively provided corresponding to respective pipe mounting areas on both inner peripheral sides of both ends where the resin pipe of the pipe joint is inserted, and each of the inner pipes is provided. One of the pair of connector pins of the member is connected using a conductive wire on the outer surface of the pipe joint to electrically connect the heating wires of the respective inner cylinder members in series, and the connector pins of the respective inner cylinder members are connected to each other. An electric fusion-type plastic pipe joint characterized in that electricity is supplied to the heating wire of each inner cylinder member from the other connector pin. 【請求項２】 前記管継手の外面で各内筒部材のコネク
ターピンの片方同志を導電線で接続した接続部の上に熱
可塑性樹脂製のカバーを被せて管継手外面との間で密封
したことを特徴とする請求項１記載の電気融着式プラス
チック管継手。2. A cover made of a thermoplastic resin is placed on a connecting portion of one of the connector pins of each inner cylinder member connected by a conductive wire on the outer surface of the pipe joint, and a seal is formed between the outer surface of the pipe joint and the joint. The plastic joint according to claim 1, wherein:
JP4330289A 1991-12-11 1992-12-10 Electric fusion plastic pipe fittings Expired - Lifetime JP2721465B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP32727291 1991-12-11
JP3-327272 1991-12-11

Publications (2)

Publication Number Publication Date
JPH05256392A JPH05256392A (en) 1993-10-05
JP2721465B2 true JP2721465B2 (en) 1998-03-04

Family

ID=18197272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4330289A Expired - Lifetime JP2721465B2 (en) 1991-12-11 1992-12-10 Electric fusion plastic pipe fittings

Country Status (1)

Country Link
JP (1) JP2721465B2 (en)

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GB0123845D0 (en) * 2001-10-04 2001-11-28 Petrotechnik Ltd Improved couplings
CN106641545B (en) * 2016-11-30 2019-09-10 浙江双林机械股份有限公司 The compound effective two-sided electric melting pipe fittings of one kind and connection method

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JPH01158288A (en) * 1987-12-14 1989-06-21 Mitsubishi Plastics Ind Ltd Pipe joint

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