JPH05318596A - Connecting method for thermoplastic resin tube to electric fusion-bonding joint - Google Patents
Connecting method for thermoplastic resin tube to electric fusion-bonding jointInfo
- Publication number
- JPH05318596A JPH05318596A JP4134793A JP13479392A JPH05318596A JP H05318596 A JPH05318596 A JP H05318596A JP 4134793 A JP4134793 A JP 4134793A JP 13479392 A JP13479392 A JP 13479392A JP H05318596 A JPH05318596 A JP H05318596A
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- stopper
- pipe
- electric fusion
- resin tube
- 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
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
- B29C66/50—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
- 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
- B29C66/63—Internally supporting the article during joining
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Branch Pipes, Bends, And The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
【産業上の利用分野】本発明は、液体の輸送ライン、特
に食品・医薬等の製造に用いられる水や超純水等の輸送
ラインに好適な、熱可塑性樹脂管と電気融着継手の接合
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining of a thermoplastic resin pipe and an electric fusion joint, which is suitable for a liquid transportation line, particularly for a water or ultrapure water transportation line used for the production of foods, medicines and the like. It is about the method.
【０００１】[0001]
【従来の技術】ポリエチレン、ポリプロピレン等の熱可
塑性樹脂管の接合は、米国特許４９２７１８４号公報に
開示されるような通電発熱体よりなる溶接手段を管受口
の内周部に埋めこんだ電気融着継手を使用し、熱可塑性
樹脂管を管受口に挿入後通電発熱体に通電し発熱させ、
管受口の内周部及びこれに接する熱可塑性樹脂管の外周
部の樹脂を溶融させて融着する「スリーブ接合」によっ
て行われている。BACKGROUND OF THE INVENTION Thermoplastic resin pipes made of polyethylene, polypropylene or the like are joined by an electric fusion method in which a welding means composed of an electric heating element as disclosed in US Pat. No. 4,927,184 is embedded in the inner peripheral portion of the pipe receiving port. Insert the thermoplastic resin tube into the pipe socket using the adhesive joint, and then energize the energizing heating element to generate heat.
This is performed by "sleeve joining" in which the resin on the inner peripheral portion of the pipe receiving port and the outer peripheral portion of the thermoplastic resin pipe in contact therewith is melted and fused.
【０００２】しかし、上記のような融着方法において
は、通電発熱体が電気融着継手の管受口の円筒状内周部
のみに設けられているので、熱可塑性樹脂管の管端部と
電気融着継手のストッパー（上記米国特許ではｃｒｏｗ
ｎ−冠状部−で示される）が当接していても、熱可塑性
樹脂管の管端部あるいは電気融着継手の端面部の樹脂は
融着するのに充分なほど溶融されず、その結果、突き合
わせ部に樹脂の溶融不良による間隙ができて液溜まりを
形成し、この部分に細菌が生息・増殖して水質が低下す
るために、食品・医薬製造用の水や半導体製造用の超純
水等の輸送ラインには適さなかった。However, in the above fusion method, since the electric heating element is provided only on the cylindrical inner peripheral portion of the pipe receiving port of the electric fusion joint, it is possible to connect the pipe end portion of the thermoplastic resin pipe to the pipe end portion. Stopper for electric fusion splicing
(indicated by n-crown portion) is abutted, the resin at the pipe end portion of the thermoplastic resin pipe or the end face portion of the electric fusion joint is not melted enough to cause fusion, and as a result, A gap is created at the abutting part due to poor melting of the resin, forming a liquid pool, and bacteria inhabit and grow in this part, which lowers the water quality.Therefore, water for food / pharmaceutical production and ultrapure water for semiconductor production Etc. was not suitable for the transportation line.
【０００３】そこで、このような問題を解決するため
に、発明者は管受口の内周部に通電発熱体が埋め込まれ
ているとともに、管受口の奥部に熱可塑性樹脂管の内径
とほぼ同一内径を有する環状のストッパーが形成され、
管受口は熱可塑性樹脂管がストッパーに当接するまで挿
入可能な内径に形成されていて、且つストッパーにも通
電発熱体が埋め込まれている電気融着継手を提案した
（特願平３−２５０６４７号）。In order to solve such a problem, the inventor has found that an electric heating element is embedded in the inner peripheral portion of the pipe receiving port and the inner diameter of the thermoplastic resin pipe is set in the inner portion of the pipe receiving port. An annular stopper with almost the same inner diameter is formed,
The pipe receptacle has an inner diameter that allows the thermoplastic resin pipe to be inserted until it comes into contact with the stopper, and an electric fusion joint in which an electric heating element is also embedded in the stopper has been proposed (Japanese Patent Application No. 3-250647). issue).
【０００４】[0004]
【発明が解決しようとする課題】上記電気融着継手を用
いて熱可塑性樹脂管との接合を行った場合、管受口内周
面及びこれと接触する熱可塑性樹脂管外周面の樹脂が溶
融し融着するとともに、ストッパー及びこれと接触する
熱可塑性樹脂管の管端部の樹脂も同様に溶融し融着する
ので、ストッパーと熱可塑性樹脂管の管端部の間に、流
体が滞留するような隙間ができることがない。When the above-mentioned electric fusion joint is used to join a thermoplastic resin pipe, the resin on the inner peripheral surface of the pipe receiving port and the outer peripheral surface of the thermoplastic resin pipe which comes into contact therewith is melted. In addition to fusion, the stopper and the resin at the pipe end of the thermoplastic resin pipe that comes into contact with it will also be fused and fused in the same way, so that the fluid may stay between the stopper and the pipe end of the thermoplastic resin pipe. There is no gap.
【０００５】しかし、熱可塑性樹脂管の切断時に、管端
部の損傷、切り口の不揃い、斜切れ等が発生すると、ス
トッパーと管端部の間に局部的な凹みや隙間等ができ、
このような部分には溶融樹脂が充分まわらず、接合され
た箇所に孔、段差、隙間等ができることがある。更に、
熱可塑性樹脂管とストッパーの当接部から溶融樹脂がは
み出し、内面にビードが発生することがある。However, when the thermoplastic resin pipe is cut, if the pipe end is damaged, the cut ends are not aligned, or the slant is cut, a local recess or gap is formed between the stopper and the pipe end.
The molten resin may not be sufficiently filled in such a portion, and a hole, a step, a gap, or the like may be formed in the joined portion. Furthermore,
The molten resin may squeeze out from the contact portion between the thermoplastic resin tube and the stopper, and a bead may be generated on the inner surface.
【０００６】本発明は、このような上記従来技術の問題
点に鑑みてなされたものであって、熱可塑性樹脂管と電
気融着継手との接合部の内面に、樹脂の溶融及び融着不
完全による局部的な凹み、熱可塑性樹脂管の斜切れ等に
よる孔、段差、隙間等の発生、及び溶融樹脂のはみ出し
によるビードの発生を防止することを目的とする。The present invention has been made in view of the above-mentioned problems of the prior art. In the present invention, the melting and fusion of resin is not adhered to the inner surface of the joint between the thermoplastic resin pipe and the electric fusion joint. The purpose of the present invention is to prevent local depression due to completeness, generation of holes, steps, gaps, etc. due to oblique cutting of the thermoplastic resin tube, and generation of beads due to extrusion of molten resin.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の熱可塑性樹脂管と電気融着継手の接合方
法は、熱可塑性樹脂管の外径とほぼ同一内径を有する管
受口の奥部に熱可塑性樹脂管の内径とほぼ同一内径を有
する環状のストッパーが形成され、管受口の内周部及び
ストッパーに通電発熱体が埋め込まれた熱可塑性樹脂製
の電気融着継手の管受口に熱可塑性樹脂管をストッパに
当接するまで挿入し、熱可塑性樹脂管とストッパーとの
当接部内に内面支持体を挿入して当接部内壁に内面支持
体の外周面を圧接しつつ、通電発熱体に通電してストッ
パーの表面と熱可塑性樹脂管の管端部を加熱溶融させる
とともに溶融状態の熱可塑性樹脂管の管端部をストッパ
ーに圧接して融着することを要旨とするものである。In order to achieve the above object, a method for joining a thermoplastic resin pipe and an electric fusion joint according to the present invention includes a pipe receiving member having an inner diameter substantially equal to the outer diameter of the thermoplastic resin pipe. An electric fusion-bonding joint made of thermoplastic resin in which an annular stopper having an inner diameter almost the same as the inner diameter of the thermoplastic resin tube is formed in the inner part of the mouth, and an electric heating element is embedded in the inner peripheral part of the pipe receiving port and the stopper. Insert the thermoplastic resin tube into the pipe socket until it contacts the stopper, insert the inner surface support into the contact area between the thermoplastic resin tube and the stopper, and press the outer peripheral surface of the inner surface support against the inner wall of the contact area. At the same time, by energizing the energizing heating element to heat and melt the surface of the stopper and the pipe end of the thermoplastic resin pipe, the pipe end of the molten thermoplastic resin pipe is pressed against the stopper and fused. Is to
【０００８】本発明に用いられる熱可塑性樹脂管の材料
としては、ポリエチレン、ポリプロピレン、ポリ塩化ビ
ニル、ＡＢＳ等の汎用熱可塑性樹脂、ポリ弗化ビニリデ
ン、ポリエチレンテレフタレート、ポリフェニレンサル
ファイド、ポリサルフォン、ポリエーテルサルフォン、
ポリエーテルエーテルケトン等の結晶性または非晶性の
熱可塑性エンジニアリング樹脂、及び上記樹脂に充填材
等を添加した複合材やポリマーアロイ等が挙げられる。The material of the thermoplastic resin tube used in the present invention is a general-purpose thermoplastic resin such as polyethylene, polypropylene, polyvinyl chloride, ABS, polyvinylidene fluoride, polyethylene terephthalate, polyphenylene sulfide, polysulfone, polyether sulfone. ,
Examples thereof include crystalline or amorphous thermoplastic engineering resins such as polyetheretherketone, and composite materials and polymer alloys obtained by adding a filler or the like to the above resins.
【０００９】また、本発明に用いられる電気融着継手
は、接合時の相溶性及び物性上の均質性等の面から、接
合される熱可塑性樹脂管と同種の樹脂で製せられている
ことが好ましく、一般に射出成形によって成形される。Further, the electric fusion-bonded joint used in the present invention is made of the same kind of resin as the thermoplastic resin pipe to be joined in view of compatibility and homogeneity in physical properties at the time of joining. Is preferable, and it is generally molded by injection molding.
【００１０】本発明に用いられる通電発熱体としては、
ニクロム線、炭素線等のフィラメント、電気融着継手と
同種の熱可塑性樹脂に炭素繊維等の導電性繊維あるいは
粉末を混合して積層体状に成形したもの等が挙げられ、
管受口の内周部及び管受口奥部に形成された環状のスト
ッパーに、内表面から樹脂中にやや埋没した状態、もし
くは内表面に露出した状態で、通常、電気融着継手成形
時に埋め込まれる。As the electric heating element used in the present invention,
Nichrome wire, filaments such as carbon wire, and the like, such as a thermoplastic resin of the same kind as the electrofusion joint mixed with conductive fibers such as carbon fibers or powder to form a laminate, and the like,
An annular stopper formed on the inner peripheral part and the inner part of the pipe receiving port, with the inner surface slightly buried in the resin or exposed to the inner surface, usually during electrofusion joint molding. Embedded.
【００１１】本発明に用いられる内面支持体は、溶融樹
脂が電気融着継手のストッパーと熱可塑性樹脂管との当
接部の内面に侵入しようとする圧力によって変形しない
強度及び硬度、熱可塑性樹脂の溶融温度に耐える耐熱性
等を有し、溶融樹脂との離型性（非粘着性）が良好な、
例えば弗素ゴム、シリコンゴム等の弾性材料よりなるも
のが好ましい。The inner surface support used in the present invention has strength and hardness that the molten resin is not deformed by the pressure that the molten resin tries to enter the inner surface of the contact portion between the stopper of the electric fusion joint and the thermoplastic resin tube. It has heat resistance to withstand the melting temperature of, and has good mold releasability (non-adhesiveness) with molten resin,
For example, one made of an elastic material such as fluorine rubber or silicon rubber is preferable.
【００１２】また、内面支持体の外周面を熱可塑性樹脂
管とストッパーとの当接部の内壁に圧接する方法として
は、中実乃至厚肉の弾性体を軸方向に押圧する、中実乃
至厚肉の弾性体に形成された軸方向の貫通孔に剛性材料
の芯体を挿入する等によって拡径し圧接するもの、比較
的薄肉の弾性体からなる中空袋内に加圧流体を導入す
る、封入された流体を通電加熱する、熱膨張率の大きい
材料でできたバネ等の熱膨張性素子を通電加熱する等に
よって膨張させ圧接するもの等が挙げられる。As a method of pressing the outer peripheral surface of the inner surface support member against the inner wall of the contact portion between the thermoplastic resin tube and the stopper, a solid or thick elastic body is pressed in the axial direction. A core material made of a rigid material is inserted into an axial through hole formed in a thick elastic body to expand the diameter and press-contact, and a pressurized fluid is introduced into a hollow bag made of a relatively thin elastic body. Examples thereof include those that energize and heat the enclosed fluid, and that cause a thermally expansive element such as a spring made of a material having a large coefficient of thermal expansion to expand and press contact by energizing and heating.
【００１３】[0013]
【作用】管受口内周面に埋め込まれた通電発熱体の発熱
によって、管受口内周面とこれに接触する熱可塑性樹脂
管外周面の樹脂が溶融し融着される。また、ストッパー
に埋め込まれた通電発熱体の発熱によってストッパー及
びこれに接触する熱可塑性樹脂管の当接部の樹脂が溶融
し融着されるが、熱可塑性樹脂管の管端部をストッパー
に圧接しつつ融着するので、熱可塑性樹脂管の管端部と
ストッパーとの当接部に局部的な凹みや隙間等の欠陥箇
所があっても、これらの欠陥箇所に溶融樹脂が充満した
状態で融着が行われる。The heat generated by the electric heating element embedded in the inner peripheral surface of the pipe receiving port melts and fuses the inner peripheral surface of the pipe receiving port and the resin on the outer peripheral surface of the thermoplastic resin tube which is in contact with the inner peripheral surface. In addition, the heat generated by the electric heating element embedded in the stopper melts and fuses the resin in the stopper and the contact portion of the thermoplastic resin tube that comes into contact with the stopper. Since it fuses while melting, even if there is a defective portion such as a local recess or gap in the abutting portion of the pipe end portion of the thermoplastic resin pipe and the stopper, these defective portions can be filled with the molten resin. Fusion is performed.
【００１４】また、熱可塑性樹脂管の管端部とストッパ
ーとの当接部の内壁には内面支持体の外周面が圧接され
ているので、熱可塑性樹脂管の管端部とストッパーの間
から溶融樹脂が内面にはみ出すことがなく、従って内面
にはビードができない。なお、ストッパーの内径は熱可
塑性樹脂管の内径とほぼ同一に形成されているので、ス
トッパーの内面と熱可塑性樹脂管の内面との接続部には
段差ができることがない。Further, since the outer peripheral surface of the inner surface support is pressed against the inner wall of the abutting portion of the pipe end portion of the thermoplastic resin pipe and the stopper, from the pipe end portion of the thermoplastic resin pipe and the stopper. The molten resin does not squeeze out on the inner surface, and therefore no beads can be formed on the inner surface. Since the inner diameter of the stopper is formed to be substantially the same as the inner diameter of the thermoplastic resin tube, no step can be formed at the connecting portion between the inner surface of the stopper and the inner surface of the thermoplastic resin tube.
【００１５】[0015]
【実施例】以下、本発明を、熱可塑性樹脂管とソケット
を接合する場合の実施例につき、図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings regarding an embodiment in which a thermoplastic resin tube and a socket are joined.
【００１６】図１は、上記実施例に用いられる電気融着
継手（ソケット）を示す断面図である。図１において、
電気融着継手１は、熱可塑性樹脂管Ｐと同じ（例えばポ
リエチレン）樹脂の射出成形によって成形されたもので
あって、管受口２の内径Ｄ1 は熱可塑性樹脂管Ｐの外径
ｄo とほぼ同じか僅かに大きい寸法に形成され、管受口
２に熱可塑性樹脂管Ｐを挿入した場合、熱可塑性樹脂管
Ｐはその端面ｅがストッパー３に当接するまで挿入可能
である。そして、管受口２の奥部には環状のストッパー
３が形成され、ストッパー３の内径Ｄ2 は熱可塑性樹脂
管Ｐの内径ｄi とほぼ同一寸法に形成されている。FIG. 1 is a sectional view showing an electric fusion joint (socket) used in the above embodiment. In FIG.
The electric fusion-bonding joint 1 is formed by injection molding of the same (for example, polyethylene) resin as the thermoplastic resin pipe P, and the inner diameter D 1 of the pipe receiving port 2 is the outer diameter d o of the thermoplastic resin pipe P. When the thermoplastic resin pipe P is inserted into the pipe receiving port 2 and is formed to have a size substantially the same as or slightly larger than the above, the thermoplastic resin pipe P can be inserted until the end surface e of the thermoplastic resin pipe P contacts the stopper 3. An annular stopper 3 is formed in the inner portion of the pipe receiving port 2, and the inner diameter D 2 of the stopper 3 is formed to have substantially the same size as the inner diameter d i of the thermoplastic resin pipe P.
【００１７】電気融着継手１の管受口２の内周部にはニ
クロム線の通電発熱体４が、また、ストッパー３にはニ
クロム線の通電発熱体５が、それぞれ円周方向に埋め込
まれている。通電発熱体４と５は連続していて、その両
端は外面に形成された端子６，６に接続されている。An electric heating element 4 of a nichrome wire is embedded in the inner peripheral portion of the pipe receiving port 2 of the electric fusion joint 1, and an electric heating element 5 of a nichrome wire is embedded in the stopper 3 in the circumferential direction. ing. The electric heating elements 4 and 5 are continuous, and both ends thereof are connected to terminals 6 and 6 formed on the outer surface.
【００１８】図２は、図１に示す電気融着継手の管受口
に熱可塑性樹脂管を挿入して加熱溶融及び融着している
状態を示す断面図である。FIG. 2 is a cross-sectional view showing a state in which a thermoplastic resin pipe is inserted into the pipe receiving port of the electric fusion joint shown in FIG. 1 and is heated and melted and fused.
【００１９】前記のように構成された電気融着継手１の
両側の管受口２に、移動式管クランプ装置７で把持され
た熱可塑性樹脂管Ｐを管軸方向に前進させて挿入する
と、熱可塑性樹脂管Ｐは管受口２の内面に沿って進入
し、その端面がストッパー３に当接して停止する。When the thermoplastic resin pipe P gripped by the movable pipe clamp device 7 is inserted into the pipe receiving ports 2 on both sides of the electric fusion-bonding joint 1 constructed as described above by advancing in the pipe axial direction, The thermoplastic resin pipe P enters along the inner surface of the pipe receiving port 2, and its end face comes into contact with the stopper 3 to stop.
【００２０】次いで、熱可塑性樹脂管Ｐとストッパー３
との当接部の内面に、外径が熱可塑性樹脂管Ｐの内径よ
りよりも少し小さい弗素ゴム製の内面支持体８を、同じ
く外径が熱可塑性樹脂管Ｐの内径より小さい板体９，１
０で挟持した状態で、板体９に取着された管状の支持杆
１１で導いて挿入する。Next, the thermoplastic resin pipe P and the stopper 3
An inner surface support 8 made of fluororubber having an outer diameter slightly smaller than the inner diameter of the thermoplastic resin pipe P is provided on the inner surface of the abutting portion with the plate body 9 also having an outer diameter smaller than the inner diameter of the thermoplastic resin pipe P. , 1
In the state of being clamped by 0, the tubular support rod 11 attached to the plate 9 guides and inserts it.
【００２１】内面支持体８と板体９には、それぞれ貫通
孔８１，９１が開口されており、一端を板体１０の中心
部に固定されたワイヤー１２が、貫通孔８１，９１及び
支持杆１１の内部を通って一方の熱可塑性樹脂管Ｐの外
に達していて、支持杆１１で板体９を支持しておきワイ
ヤー１２を強く引くことによって、内面支持体８は板体
９，１０で軸方向に押圧され、半径方向に拡径されて、
その外周面が熱可塑性樹脂管Ｐとストッパー３との当接
部の内壁面に圧接される。Through holes 81 and 91 are opened in the inner surface support 8 and the plate 9, respectively, and the wire 12 having one end fixed to the central portion of the plate 10 receives the through holes 81 and 91 and the support rod. The inner surface support member 8 passes through the inside of 11 and reaches the outside of the one thermoplastic resin pipe P, the plate 9 is supported by the support rod 11, and the wire 12 is strongly pulled, so that the inner surface support member 8 is made into the plate members 9 and 10. Is pressed in the axial direction and expanded in the radial direction,
The outer peripheral surface is pressed against the inner wall surface of the contact portion between the thermoplastic resin pipe P and the stopper 3.
【００２２】内面支持体８の外周面を熱可塑性樹脂管Ｐ
とストッパー３との当接部の内壁面に圧接しつつ、移動
式管クランプ装置７によって熱可塑性樹脂管Ｐを引き続
き前進させるようにしてその管端部をストッパー３に圧
接し、端子６，６間に電圧をかけると、通電発熱体４及
び５が発熱し、その近傍の電気融着継手１の樹脂、更に
熱可塑性樹脂管Ｐの樹脂が溶融するが、熱可塑性樹脂管
Ｐの管端部がストッパー３に圧接されているので、熱可
塑性樹脂管Ｐの内周の角部やストッパーとの当接部等
に、内径寸法の若干の差による段差、局部的な凹み、熱
可塑性樹脂管Ｐの切断不良等による隙間等の欠陥があっ
ても、これらの欠陥箇所に溶融樹脂が充満した状態で融
着が行われるので、熱可塑性樹脂管Ｐと電気融着継手１
の接合部には、液体の滞留の原因となるような孔、段
差、隙間等ができることがない。The outer peripheral surface of the inner support 8 is covered with a thermoplastic resin pipe P.
While pressing the inner wall surface of the contact portion between the stopper 3 and the stopper 3, the movable pipe clamp device 7 continuously advances the thermoplastic resin pipe P so that the pipe end portion is pressed against the stopper 3 and the terminals 6, 6 are connected. When a voltage is applied between them, the electric heating elements 4 and 5 generate heat, and the resin of the electric fusion joint 1 and the resin of the thermoplastic resin pipe P in the vicinity thereof are melted, but the pipe end portion of the thermoplastic resin pipe P is melted. Is pressed against the stopper 3, a step due to a slight difference in inner diameter, a local recess, a thermoplastic resin pipe P at an inner peripheral corner portion of the thermoplastic resin pipe P, a contact portion with the stopper, or the like. Even if there are defects such as gaps due to poor cutting of the resin, fusion is performed in a state in which these defective portions are filled with the molten resin. Therefore, the thermoplastic resin pipe P and the electric fusion joint 1
There is no formation of holes, steps, gaps, etc., which would cause the liquid to stay at the joint.
【００２３】更に、熱可塑性樹脂管Ｐとストッパー３と
の当接部の内壁には内面支持体８の外周面が圧接されて
いて、溶融樹脂が当接部の内面にはみ出すことがないの
で、ビードのない平滑な内面の接合状態が得られる。Further, since the outer peripheral surface of the inner surface support member 8 is pressed against the inner wall of the contact portion between the thermoplastic resin pipe P and the stopper 3, the molten resin does not protrude to the inner surface of the contact portion. A bead-free and smooth inner surface joint can be obtained.
【００２４】なお、融着後、融着部分を冷却固化し、ワ
イヤー１２を緩めて内面支持体８の外径を最初の寸法ま
で縮径復元させ、次いでワイヤー１２及び支持杆１１を
同時に引くことによって、内面支持体８を熱可塑性樹脂
管Ｐの外に抜き出す。After fusion, the fused portion is cooled and solidified, the wire 12 is loosened to restore the outer diameter of the inner surface support 8 to the initial size, and then the wire 12 and the support rod 11 are simultaneously pulled. The inner support 8 is pulled out of the thermoplastic resin pipe P by.
【００２５】[0025]
【発明の効果】以上の説明から明らかなように、本発明
の熱可塑性樹脂管と電気融着継手の接合方法によれば、
熱可塑性樹脂管と電気融着継手とは、細菌の生息や増殖
の原因となるような孔、段差、隙間、ビード等が生じる
ことなく接合されるので、高純度の水質を要求される管
路の形成には特に適している。更に、熱可塑性樹脂管と
電気融着継手とはスリーブ接合と突き合わせ接合の両方
で接合されるので、接合強度及び水密性が増し、管路の
信頼性が向上する。As is apparent from the above description, according to the method for joining a thermoplastic resin pipe and an electric fusion joint of the present invention,
Thermoplastic resin pipes and electrofusion joints are joined without the formation of holes, steps, gaps, beads, etc. that could cause bacteria to inhabit or multiply, so pipes that require high-purity water quality. Is particularly suitable for the formation of Furthermore, since the thermoplastic resin pipe and the electric fusion joint are joined by both sleeve joining and butt joining, joining strength and watertightness are increased, and the reliability of the conduit is improved.
【図１】本発明の実施例に用いられる電気融着継手を示
す断面図である。FIG. 1 is a sectional view showing an electric fusion joint used in an example of the present invention.
【図２】本発明の実施例において熱可塑性樹脂管と電気
融着継手を加熱溶融及び融着している状態を示す断面図
である。FIG. 2 is a cross-sectional view showing a state in which a thermoplastic resin tube and an electric fusion joint are heated and melted and fused in an example of the present invention.
１ 電気融着継手 ２ 管受口 ３ ストッパー ４，５ 通電発熱体 ７ 移動式管クランプ装置 ８ 内面支持体 ９，１０ 板体 １１ 支持杆 １２ ワイヤー Ｐ 熱可塑性樹脂管 Ｄ1 管受口の内径 Ｄ2 ストッパーの内径 ｄo 熱可塑性樹脂管の外径 ｄi 熱可塑性樹脂管の内径DESCRIPTION OF SYMBOLS 1 Electric fusion joint 2 Pipe receiving port 3 Stopper 4,5 Electric heating element 7 Moving pipe clamping device 8 Inner surface support 9,10 Plate 11 Support rod 12 Wire P Thermoplastic resin pipe D 1 Pipe receiving inner diameter D 2 Stopper inner diameter d o Thermoplastic resin tube outer diameter d i Thermoplastic resin tube inner diameter
Claims (1)
有する管受口の奥部に熱可塑性樹脂管の内径とほぼ同一
内径を有する環状のストッパーが形成され、管受口の内
周部及びストッパーに通電発熱体が埋め込まれた熱可塑
性樹脂製の電気融着継手の管受口に熱可塑性樹脂管をス
トッパーに当接するまで挿入し、熱可塑性樹脂管とスト
ッパーとの当接部内に内面支持体を挿入して当接部内壁
に内面支持体の外周面を圧接しつつ、通電発熱体に通電
してストッパーの表面と熱可塑性樹脂管の管端部を加熱
溶融させるとともに溶融状態の熱可塑性樹脂管の管端部
をストッパーに圧接して融着することを特徴とする、熱
可塑性樹脂管と電気融着継手の接合方法。1. An inner circumference of a pipe receiving opening is formed in an inner portion of the pipe receiving opening having an inner diameter substantially the same as an outer diameter of the thermoplastic resin tube and an annular stopper having an inner diameter substantially the same as an inner diameter of the thermoplastic resin tube. Insert the thermoplastic resin tube into the pipe socket of the electric fusion joint made of thermoplastic resin in which the energization heating element is embedded in the stopper and the stopper until it abuts the stopper, and in the contact portion between the thermoplastic resin tube and the stopper. While inserting the inner surface support and pressing the outer peripheral surface of the inner surface support against the inner wall of the abutting portion, energize the energization heating element to heat and melt the surface of the stopper and the pipe end of the thermoplastic resin pipe and A method for joining a thermoplastic resin pipe and an electric fusion joint, characterized in that the pipe end portion of the thermoplastic resin pipe is pressed against a stopper and fused.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4134793A JPH05318596A (en) | 1992-05-27 | 1992-05-27 | Connecting method for thermoplastic resin tube to electric fusion-bonding joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4134793A JPH05318596A (en) | 1992-05-27 | 1992-05-27 | Connecting method for thermoplastic resin tube to electric fusion-bonding joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05318596A true JPH05318596A (en) | 1993-12-03 |
Family
ID=15136675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4134793A Pending JPH05318596A (en) | 1992-05-27 | 1992-05-27 | Connecting method for thermoplastic resin tube to electric fusion-bonding joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05318596A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10260658B2 (en) | 2015-06-24 | 2019-04-16 | Jan Larsen | Underwater pipe assembly and method for assembling underwater pipes |
| JPWO2021149832A1 (en) * | 2020-01-24 | 2021-07-29 |
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|---|---|---|---|---|
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| JPS624991A (en) * | 1985-06-28 | 1987-01-10 | 三菱樹脂株式会社 | Method of joining plastic pipe |
| JPH01133719A (en) * | 1987-08-28 | 1989-05-25 | Georg Fischer Ag | Welder for tubular section composed of thermoplastic material |
| JPH01229196A (en) * | 1988-02-26 | 1989-09-12 | Alphacan Sa | Pipe using polyolefine group resin as base for forming piping path, joint for coupling thereof and manufacture thereof |
| JPH0325096U (en) * | 1989-07-21 | 1991-03-14 | ||
| JPH0419494A (en) * | 1990-05-11 | 1992-01-23 | Kubota Corp | Electric fusion joint |
| JPH0429828A (en) * | 1990-05-25 | 1992-01-31 | Sekisui Chem Co Ltd | Connection of tube |
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1992
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56118A (en) * | 1979-06-08 | 1981-01-06 | Huels Chemische Werke Ag | Seamless binding method of and apparatus for hollow molding of thermoplastic plastics |
| JPS624991A (en) * | 1985-06-28 | 1987-01-10 | 三菱樹脂株式会社 | Method of joining plastic pipe |
| JPH01133719A (en) * | 1987-08-28 | 1989-05-25 | Georg Fischer Ag | Welder for tubular section composed of thermoplastic material |
| JPH01229196A (en) * | 1988-02-26 | 1989-09-12 | Alphacan Sa | Pipe using polyolefine group resin as base for forming piping path, joint for coupling thereof and manufacture thereof |
| JPH0325096U (en) * | 1989-07-21 | 1991-03-14 | ||
| JPH0419494A (en) * | 1990-05-11 | 1992-01-23 | Kubota Corp | Electric fusion joint |
| JPH0429828A (en) * | 1990-05-25 | 1992-01-31 | Sekisui Chem Co Ltd | Connection of tube |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10260658B2 (en) | 2015-06-24 | 2019-04-16 | Jan Larsen | Underwater pipe assembly and method for assembling underwater pipes |
| JPWO2021149832A1 (en) * | 2020-01-24 | 2021-07-29 | ||
| WO2021149832A1 (en) * | 2020-01-24 | 2021-07-29 | 積水化学工業株式会社 | Electrically fused joint and fusing method |
| KR20220115615A (en) | 2020-01-24 | 2022-08-17 | 세키스이가가쿠 고교가부시키가이샤 | Electrofusion joints and welding methods |
| CN115003947A (en) * | 2020-01-24 | 2022-09-02 | 积水化学工业株式会社 | Electric fusion joint and fusion method |
| CN115003947B (en) * | 2020-01-24 | 2024-03-22 | 积水化学工业株式会社 | Electric welding joint and welding method |
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