JPH03277894A - welded joints - Google Patents

welded joints

Info

Publication number
JPH03277894A
JPH03277894A JP2080427A JP8042790A JPH03277894A JP H03277894 A JPH03277894 A JP H03277894A JP 2080427 A JP2080427 A JP 2080427A JP 8042790 A JP8042790 A JP 8042790A JP H03277894 A JPH03277894 A JP H03277894A
Authority
JP
Japan
Prior art keywords
joint
heating element
cylinder
indicator
joint body
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
JP2080427A
Other languages
Japanese (ja)
Inventor
Yonekazu Yamada
山田　米数
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.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical 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 Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP2080427A priority Critical patent/JPH03277894A/en
Publication of JPH03277894A publication Critical patent/JPH03277894A/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
    • 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
    • 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
    • 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
    • B29C66/9141—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 temperature
    • B29C66/91411—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 temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • 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
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/976—Checking completion of joining or correct joining by using indications on at least one of the joined parts by the use of an indicator pin, e.g. being integral with one of the parts to be joined
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics

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 movement of a heating element in a deposition joint provided with the heating element on a joint main body made of thermosetting resin, and an indicator in the vicinity thereof, by proving a cylinder, a piston provided with a display exposed therefrom, and an expansion body. CONSTITUTION:A socket-like deposition joint is formed by inserting and depositing thermosetting resins P1, P2 in opening ends 11, 12 of a cylindrical joint main body 1. An electroconductive line 2 such as nichrome wire is embedded in an inner peripheral part of the joint main body 1 as a heating element. An indicator 5 is provided in the vicinity of the electroconductive wire 2 to display a fused condition of the resin. The indicator 5 is made up of a cylinder 51, a piston 52 having a display exposed from the cylinder 51, and an expansion body 53 which expands within the range of fusing temperature. It is, therefore possible to prevent variation of fused condition, and shortening of the heating element.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、熱可塑性樹脂製のガス管や水道管等の溶着接
合に用いられる溶着継手に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a welding joint used for welding and joining thermoplastic resin gas pipes, water pipes, and the like.

（従来の技術） 継手には、継手本体が熱可塑性樹脂で形成され、該継手
本体の内周部に加熱要素が配設された溶着継手とよばれ
るものがある。この溶着継手は、継手本体に熱可塑性樹
脂管を差し込んで加熱要素を発熱させることにより、継
手本体の内周部と熱可塑性樹脂管の外周部が溶融して互
いに溶着するようになっている。(Prior Art) Some types of joints are called welded joints, in which the joint body is made of thermoplastic resin and a heating element is disposed on the inner circumference of the joint body. In this welding joint, a thermoplastic resin pipe is inserted into a joint body and a heating element generates heat, so that the inner peripheral part of the joint main body and the outer peripheral part of the thermoplastic resin pipe are melted and welded to each other.

更に、このような溶着継手には、例えば、特開昭６１−
６２６９６号公報に記載されているように、継手本体の
外周部に樹脂の溶融状態を表示するインジケーターが設
けられているものがある。Furthermore, for such welded joints, for example,
As described in Japanese Patent No. 62696, some joints are provided with an indicator on the outer periphery of the joint body to display the molten state of the resin.

前記インジケーターは、継手本体の溶融領域内にくぼみ
が形成され、該くぼみ内に指示器が移動可能に設けられ
たもので、加熱要素により継手本体が所定の溶融状態と
なると、熱膨張による圧力で、溶融樹脂の一部がくぼみ
内に浸入し、この浸入樹脂によりくぼみ内の指示器が押
し上げられて継手本体から突出するようになっている。The indicator has a recess formed in the melting region of the joint body, and an indicator is movably installed in the recess. When the joint body reaches a predetermined melting state by the heating element, the pressure caused by thermal expansion causes the indicator to melt. A portion of the molten resin enters the recess, and the infiltrated resin pushes up the indicator within the recess so that it protrudes from the joint body.

（発明が解決しようとする課題） しかしながら、このような従来のインジケーターを有す
る溶着継手にあっては、溶融した樹脂がくぼみ内に入り
込むようになっているため、溶融樹脂の急激な移動に伴
って加熱要素も一緒に移動し、加熱要素の配列がズレる
ことで溶融状態にバラツキが生じるという問題があった
。(Problem to be Solved by the Invention) However, in a welded joint having such a conventional indicator, the molten resin enters the recess, and as a result of the rapid movement of the molten resin, There was a problem in that the heating elements also moved together, and the arrangement of the heating elements was misaligned, resulting in variations in the melted state.

また、加熱要素として、ワイヤ等の導電線を用いている
場合には、加熱要素が移動して短絡するといった問題も
ある。Further, when a conductive wire such as a wire is used as the heating element, there is also a problem that the heating element moves and short circuits occur.

本発明は、上記従来の問題に着目し、加熱要素の移動が
起こらないようにインジケーターが樹脂の溶融状態を表
示する溶着継手を提供することを目的としている。The present invention has focused on the above-mentioned conventional problems, and aims to provide a welded joint in which an indicator indicates the molten state of the resin so that the heating element does not move.

（課題を解決するための手段） 本発明は、上述のような課題を解決することを目的とし
てなされたもので、この目的達成のために、本発明の溶
着継手は、継手本体が熱可塑性樹脂で形成され、該継手
本体の内周部に加熱要素が設けられ、該加熱要素の近傍
位置に樹脂の溶融状態を表示するインジケーターが設け
られている溶着継手において、前記インジケーターが、
継手本体の表面に開口して設けられているシリンダーと
、該シリンダー内に気密室を形成するべく設けられ、シ
リンダーの開口部から外に露出する表示部を備えている
ピストンと、前記シリンダー内の気密室に内蔵され、継
ぎ手本体の溶融温度領域内で膨張する膨張体と、で構成
されているものである。(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned problems, and in order to achieve this purpose, the welded joint of the present invention has a joint body made of thermoplastic resin. A welded joint, which is formed of
a cylinder provided with an opening on the surface of the joint body; a piston provided to form an airtight chamber within the cylinder; and a piston provided with a display portion exposed to the outside from the opening of the cylinder; It is built in an airtight chamber and consists of an expansion body that expands within the melting temperature range of the joint body.

（作　用） 本発明の溶着継手では、加熱要素の発熱により、継手本
体の内周部及び継手本体に連結される熱可塑性樹脂管の
外周部が溶融すると、膨張体が加熱されて体積膨張し、
気密室内の圧力が上昇してピストンが持ち上る。即ち、
作業者は、シリンダーの開口部から外に露出している表
示部によってこのピストンの状態を知ることができ、こ
のピストンの状態から継手本体の内周部と熱可塑性樹脂
管の外周部の溶着状態を判断することができる。(Function) In the welded joint of the present invention, when the inner peripheral part of the joint body and the outer peripheral part of the thermoplastic resin pipe connected to the joint body are melted by the heat generated by the heating element, the expansion body is heated and expands in volume. ,
The pressure inside the airtight chamber increases and the piston lifts up. That is,
The operator can know the condition of this piston from the display section exposed outside from the opening of the cylinder, and from the condition of the piston, the state of welding between the inner circumference of the joint body and the outer circumference of the thermoplastic resin pipe can be determined. can be judged.

（実施例） 以下、本発明の実施例を図面により詳述する。(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

尚、実施例を説明するにあたり、ソケット状の溶着継手
を例にとる。In describing the embodiment, a socket-shaped welded joint will be taken as an example.

まず１．第１図及び第２図に基づいて、実施例の構成を
説明する。First 1. The configuration of the embodiment will be described based on FIGS. 1 and 2.

第１図は本発明実施例の溶着継手を示す縦断面図、第２
図は第１図の■−■断面図である。Fig. 1 is a longitudinal sectional view showing a welded joint according to an embodiment of the present invention;
The figure is a sectional view taken along the line ■-■ in FIG.

本実施例の溶着継手は、第１図に示すように、継手本体
１が円筒状に形成され、該継手本体１の開口端１１．１
２に、熱可塑性樹脂管Ｐｉ、Ｐ２の端部が挿入状態で溶
着接合されるソケット状の溶着継手である。As shown in FIG. 1, the welded joint of this embodiment has a joint body 1 formed in a cylindrical shape, and an open end 11.1 of the joint body 1.
2 is a socket-shaped welding joint in which the ends of the thermoplastic resin pipes Pi and P2 are welded and joined in an inserted state.

前記継手本体１は、ポリプロピレン樹脂、ポリエチレン
樹脂、塩化ビニル樹脂、ポリブテン樹脂等の熱可塑性樹
脂を素材として、例えば射出成形により形成されており
、内面には、軸方向略中央部に、両開口端１１．１２か
ら挿入した熱可塑性樹脂管Ｐ１．Ｐ２の挿入を所定位置
で規制するための突起１３が環状に形成されている。The joint body 1 is made of thermoplastic resin such as polypropylene resin, polyethylene resin, vinyl chloride resin, polybutene resin, etc., and is formed by, for example, injection molding. 11. Thermoplastic resin pipe P1 inserted from 12. A protrusion 13 is formed in an annular shape to restrict insertion of P2 at a predetermined position.

また、図中２は加熱要素として設けられた一本のニクロ
ム線等の導電線で、継手本体１の内周部に螺旋状に埋設
されている。また、前記導電線２は、継手本体１の突起
１３を中心として、一方の開口端１１から挿入する熱可
塑性樹脂管Ｐ１との溶着用の第１群２１と、他方の開口
端１２から挿入する熱可塑性樹脂管Ｐ２との溶着用の第
２群２２とに分割して設けられている。Further, in the figure, reference numeral 2 denotes a conductive wire such as a single nichrome wire provided as a heating element, which is embedded in the inner circumference of the joint body 1 in a spiral shape. Further, the conductive wires 2 are inserted into a first group 21 for welding with the thermoplastic resin pipe P1, which is inserted from one open end 11, and inserted from the other open end 12, centering on the protrusion 13 of the joint body 1. A second group 22 for welding to the thermoplastic resin pipe P2 is provided separately.

また、図中３はボスで、前記継手本体１の両端部外面に
一体形成されている。ボス３の内部には、主として真鍮
や砲金等で形成された端子４が内蔵されており、この端
子４は、前記導電線３の両端と接続されている。Further, numeral 3 in the figure indicates a boss, which is integrally formed on the outer surface of both ends of the joint body 1. A terminal 4 mainly made of brass, gunmetal, or the like is built inside the boss 3, and this terminal 4 is connected to both ends of the conductive wire 3.

更に、図中５は樹脂の溶融状態を表示するインジケータ
ーで、前記導電線２の第１群２１の近傍位置と、導電線
２の第２群２２の近傍位置の三箇所に設けられている。Further, numeral 5 in the figure indicates indicators for displaying the molten state of the resin, which are provided at three locations: one near the first group 21 of the conductive wires 2, and the other near the second group 22 of the conductive wires 2.

また、前記インジケーター５は、継手本体１の外周部の
表面に開口して設けられているシリンダー５１と、該シ
リンダー５１内に気密室５０を形成するべく設けられ、
シリンダー５１の開口部に露出する表示部５２ａを備え
ているピストン５２と、前記シリンダー５１内の気密室
５０に設けられ、継手本体１の溶融温度領域内で体積膨
張する膨張体５３と、で構成されている。Further, the indicator 5 is provided with a cylinder 51 that is opened on the outer peripheral surface of the joint body 1, and is provided to form an airtight chamber 50 within the cylinder 51,
It is composed of a piston 52 equipped with a display part 52a exposed at the opening of the cylinder 51, and an expansion body 53 that is provided in an airtight chamber 50 in the cylinder 51 and expands in volume within the melting temperature range of the joint body 1. has been done.

尚、前記ピストン５２は、表示部５２ａが棒で形成され
、本体５２ｂがゴム栓で形成されている。また、前記膨
張体５３としては、例えば分離・精製されたワックスが
使用され、好ましくはアルミニウムなどの導電性粉末を
混合して使用するのが好ましい。Incidentally, in the piston 52, the display portion 52a is formed of a rod, and the main body 52b is formed of a rubber stopper. Further, as the expansion body 53, for example, separated and purified wax is used, preferably mixed with conductive powder such as aluminum.

次に、実施例の作用を説明する。Next, the operation of the embodiment will be explained.

本実施例の溶着継手に熱可塑性樹脂管ＰＩ、　Ｐ２を接
続する場合、まず、画然可塑性樹脂管Ｐ１、Ｐ２を突起
１３により規制されるまで、それぞれ両開口端１１．１
２から挿入する。When connecting the thermoplastic resin pipes PI and P2 to the welded joint of this embodiment, first, the respective open ends 11.
Insert from 2.

次に、ボス３の内部に図示を省略したコントローラのコ
ネクタを差し込んで、端子４．４間に一定電圧をかけて
通電させ、導電線２を発熱させる。そして、その熱で継
手本体１の内周部及び熱可塑性樹脂管ＰＩ、Ｐ２の外周
部を溶融させる。Next, a controller connector (not shown) is inserted into the boss 3, and a constant voltage is applied between the terminals 4 and 4 to energize the terminals 4 and 4, thereby causing the conductive wire 2 to generate heat. Then, the heat melts the inner peripheral part of the joint body 1 and the outer peripheral parts of the thermoplastic resin pipes PI and P2.

継手本体１の内周部及び熱可塑性樹脂管Ｐｉ、Ｐ２の外
周部が溶融すると、膨張体５３が加熱されて体積膨張し
、気密室５０内の圧力が上昇してピストン５２が持ち上
る。即ち、作業者は、シリンダー５１の開口部から外に
露出している表示部５２ａによってこのピストン５２の
状態を知ることができ、このピストン５２の状態から継
手本体１の内周部と熱可塑性樹脂管ＰＩ、Ｐ２の外周部
の溶着状態を判断することができる。When the inner circumferential portion of the joint body 1 and the outer circumferential portions of the thermoplastic resin pipes Pi and P2 are melted, the expanding body 53 is heated and expands in volume, the pressure within the airtight chamber 50 increases, and the piston 52 is lifted. That is, the operator can know the state of the piston 52 from the display section 52a exposed outside from the opening of the cylinder 51, and from the state of the piston 52, the inner circumference of the joint body 1 and the thermoplastic resin It is possible to judge the welding state of the outer peripheries of the pipes PI and P2.

つまり、本実施例の溶着継手は、溶着時において、継手
本体１の内周部及び画然可塑性樹脂管Ｐ１、Ｐ２の外周
部の溶着状態をピストン５２の状態で判断し、溶着状態
が最適な状態になった時に通電を解除することができる
ので、溶着継手と熱可塑性樹脂管ＰＩ、Ｐ２とを確実に
溶着接合することができる。In other words, in the welded joint of this embodiment, during welding, the welded state of the inner peripheral part of the joint body 1 and the outer peripheral parts of the clearly plastic resin pipes P1 and P2 is determined based on the state of the piston 52, and the welded state is determined to be optimal. Since the energization can be canceled when the condition is reached, the welding joint and the thermoplastic resin pipes PI and P2 can be reliably welded and joined.

このように、本実施例の溶着継手は、樹脂の移動により
持ち上げられる指示器の状態ではなく、膨張体５３の体
積膨張により持ち上げられるピストン５２の状態から継
手本体１の内周部と熱可塑性樹脂管ＰＩ、Ｐ２の外周部
の溶着状態を判断するものであるため、溶着時に導電線
２が移動しないようにすることができる。即ち、溶着状
態にバラツキが生じたり、導電線２が短絡したりするの
を防止することができるという効果が得られる。In this way, the welded joint of this embodiment is not in the state of the indicator being lifted by the movement of the resin, but in the state of the piston 52 being lifted by the volume expansion of the expansion body 53, and the inner peripheral part of the joint body 1 and the thermoplastic resin are Since the welding state of the outer peripheral portions of the pipes PI and P2 is determined, it is possible to prevent the conductive wire 2 from moving during welding. That is, it is possible to prevent variations in the welding state and short-circuiting of the conductive wires 2.

以上、本発明の実施例を図面により詳述してきたが、具
体的な構成はこの実施例に限られるものではなく本発明
の要旨を逸脱しない範囲の設計変更等があっても本発明
に含まれる。Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are design changes within the scope of the gist of the present invention, they are included in the present invention. It will be done.

例えば、実施例では、ソケット形状の溶着継手°に適用
した例を示したが、分岐継手やエルボ、チーズ、レジュ
ーサ等、形状の異なる溶着継手に適用してもよい。For example, in the embodiment, an example is shown in which the present invention is applied to a socket-shaped welded joint, but it may also be applied to welded joints of different shapes, such as a branch joint, an elbow, a cheese, and a reducer.

また、加熱要素は、本質的なものではなく、例えば、多
数の細い長尺の炭素繊維が束ねられた加熱抵抗線であっ
てもよい。また、長さが１０〜２００ｍｍのニクロム線
や炭素繊維等の導電性繊維がシート状に抄造されたもの
であってもよい。Further, the heating element is not essential, and may be, for example, a heating resistance wire in which a large number of thin and long carbon fibers are bundled. Further, conductive fibers such as nichrome wires and carbon fibers having a length of 10 to 200 mm may be formed into a sheet.

また、インジケーター５は、実施例で示したようにシリ
ンダ５１が継手本体１の外周部の表面に開口する向きに
限らず、第３図に示すように、シリンダー５１が、継手
本体１の端部の表面に開口する向きに設けてもよい。In addition, the indicator 5 is not limited to the direction in which the cylinder 51 opens to the surface of the outer peripheral part of the joint body 1 as shown in the embodiment; The opening may be provided in the direction of opening on the surface.

（発明の効果） 以上説明してきたように、本発明の溶着継手は、樹脂の
移動により持ち上げられる指示器の状態ではなく、膨張
体の体積膨張により持ち上げられるピストンの状態から
継手本体の内周部と熱可塑性樹脂管の外周部の溶着状態
を判断するものであるため、溶着時に加熱要素が移動し
ないようにすることができる。即ち、溶融状態にバラツ
キが生じたり、加熱要素が短絡したりするのを防止する
ことができるという効果が得られる。(Effects of the Invention) As explained above, the welded joint of the present invention is not in the state of the indicator being lifted by the movement of the resin, but in the state of the piston being lifted by the volume expansion of the expander. Since the welding state of the outer circumferential portion of the thermoplastic resin pipe is determined as follows, it is possible to prevent the heating element from moving during welding. That is, it is possible to prevent variations in the molten state and short-circuiting of the heating element.

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

第１図は本発明実施例の溶着継手を示す縦断面図、第２
図は第１図の■−■断面図、第３図はインジケーターの
向きを変更した溶着継手の要部断面図である。 １・・・継手本体 ２・・・導電線（加熱要素） ５・・・インジケーター ５０・・・気密室 ５１・・・シリンダー ５２・・・ピストン ５３・・・膨張体Fig. 1 is a longitudinal sectional view showing a welded joint according to an embodiment of the present invention;
The figure is a cross-sectional view taken along the line ■--■ of FIG. 1, and FIG. 3 is a cross-sectional view of the main part of the welded joint with the direction of the indicator changed. 1... Joint body 2... Conductive wire (heating element) 5... Indicator 50... Airtight chamber 51... Cylinder 52... Piston 53... Expansion body

Claims (1)

【特許請求の範囲】 １）継手本体が熱可塑性樹脂で形成され、該継手本体の
内周部に加熱要素が設けられ、該加熱要素の近傍位置に
樹脂の溶融状態を表示するインジケーターが設けられて
いる溶着継手において、 前記インジケーターが、継手本体の表面に開口して設け
られているシリンダーと、該シリンダー内に気密室を形
成するべく設けられ、シリンダーの開口部から外に露出
する表示部を備えているピストンと、前記シリンダー内
の気密室に内蔵され、継手本体の溶融温度領域内で膨張
する膨張体と、で構成されていることを特徴とする溶着
継手。[Claims] 1) The joint body is made of thermoplastic resin, a heating element is provided on the inner circumference of the joint body, and an indicator is provided near the heating element to display the molten state of the resin. In the welded joint, the indicator includes a cylinder provided with an opening on the surface of the joint body, and a display portion provided to form an airtight chamber within the cylinder and exposed to the outside from the opening of the cylinder. A welded joint comprising: a piston provided therein; and an expansion body that is built in an airtight chamber within the cylinder and expands within the melting temperature range of the joint body.
JP2080427A 1990-03-27 1990-03-27 welded joints Pending JPH03277894A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2080427A JPH03277894A (en) 1990-03-27 1990-03-27 welded joints

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2080427A JPH03277894A (en) 1990-03-27 1990-03-27 welded joints

Publications (1)

Publication Number Publication Date
JPH03277894A true JPH03277894A (en) 1991-12-09

Family

ID=13717981

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2080427A Pending JPH03277894A (en) 1990-03-27 1990-03-27 welded joints

Country Status (1)

Country Link
JP (1) JPH03277894A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1376083A2 (en) 2002-06-25 2004-01-02 Friatec Aktiengesellschaft Fusion indicator for a welding socket
EP2873513A1 (en) * 2013-11-19 2015-05-20 Georg Fischer Rohrleitungssysteme AG Moulded connection component for electrically welded tubes
JP2018096419A (en) * 2016-12-12 2018-06-21 積水化学工業株式会社 Electric fusion joint

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1376083A2 (en) 2002-06-25 2004-01-02 Friatec Aktiengesellschaft Fusion indicator for a welding socket
EP1376083A3 (en) * 2002-06-25 2006-01-11 Friatec Aktiengesellschaft Fusion indicator for a welding socket
EP2873513A1 (en) * 2013-11-19 2015-05-20 Georg Fischer Rohrleitungssysteme AG Moulded connection component for electrically welded tubes
JP2018096419A (en) * 2016-12-12 2018-06-21 積水化学工業株式会社 Electric fusion joint

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