JP4169404B2 - Pipe fitting - Google Patents

Pipe fitting Download PDF

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Publication number
JP4169404B2
JP4169404B2 JP29473198A JP29473198A JP4169404B2 JP 4169404 B2 JP4169404 B2 JP 4169404B2 JP 29473198 A JP29473198 A JP 29473198A JP 29473198 A JP29473198 A JP 29473198A JP 4169404 B2 JP4169404 B2 JP 4169404B2
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JP
Japan
Prior art keywords
packing
lock ring
fluid pipe
joint body
annular groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP29473198A
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Japanese (ja)
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JP2000055253A (en
Inventor
孝夫 橋本
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.)
Cosmo Koki Co Ltd
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Cosmo Koki Co Ltd
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Publication date
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Priority to JP29473198A priority Critical patent/JP4169404B2/en
Publication of JP2000055253A publication Critical patent/JP2000055253A/en
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Publication of JP4169404B2 publication Critical patent/JP4169404B2/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00Joints with sleeve or socket
    • F16L21/02Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/04Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings in which sealing rings are compressed by axially-movable members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00Couplings of the quick-acting type
    • F16L37/08Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/092Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector
    • F16L37/0925Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector with rings which bite into the wall of the pipe
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00Couplings of the quick-acting type
    • F16L37/08Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/092Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector
    • F16L37/0926Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector with an inner support sleeve arranged within the pipe
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00Couplings of the quick-acting type
    • F16L37/08Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/092Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector
    • F16L37/0927Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector the wedge element being axially displaceable for releasing the coupling

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Sleeves (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、水道管、ガス管、プラント用配管等に使用される流体管を接合する管継手であって、パッキンが装着された継手体に流体管を差し込み、ロックリングを縮径させて流体管の抜け出しを防止する管継手に関する。
【0002】
【従来の技術】
外圧によって変形するポリエチレン管等の流体管Pを接続する継手として、図7および図8に示すような管継手が知られている。
【0003】
この従来の管継手Aは、継手体B、継手体Bに螺合される袋ナットC、流体管内面に挿入されるインコアD、パッキンE、1つ割りのロックリングF、パッキン押えGからなる。
【0004】
継手体Bには、その端部内面にパッキンEを収容する収容凹部B1が設けられ、その端部側には袋ナットCが螺合される雌ねじ部B2が形成されている。袋ナットCの継手体B側の外径部には、雄ねじ部C1が形成され、その内周面は、パッキンE側に拡径するテーパ面C2が設けられている。インコアDは、流体管の変形を防止できる強度を持ち、外径が流体管Pの内径とほぼ等しく設定されており、一方の端部には面取りD1が、他方の端部には外径方向に突出した鍔部D2が形成されている。ロックリングFは、内面に流体管Pの外面に食込む刃F1が形成され、外面に袋ナットCのテーパ面C2に密接するテーパ面F2が形成された縮径する1つ割りの形状をしている。
【0005】
この継手Aに流体管Pを接続するには、まず、流体管Pの内径にインコアDを挿入する。次に、袋ナットC、ロックリングF、パッキン押えG、パッキンEの順で流体管Pに外嵌させる。部品を外嵌させた流体管Pを継手体Bに挿入し、袋ナットCの雄ねじ部C1を、継手体Bの雌ねじ部B2に螺合させ締め付ける。
【0006】
ロックリングFが袋ナットCのテーパ面C2に押されて継手体B方向に移動し、ロックリングFの端部の平面におされてパッキン押えGとパッキンEが継手体Bの収容凹部B1に収容される。
【0007】
このとき、袋ナットCは、回転しながら継手体B方向に移動し、テーパ面C2でロックリングFを縮径させる。ロックリングFの刃F1が流体管Pの外径に食い込み、インコアDが流体管Pの変形を防止することにより、流体管Pの管継手Aからの離脱を阻止して接続される。
【0008】
また、別の従来例として、図9に示すような押輪HでロックリングFを押し、ロックリングFがパッキン押えGを介してパッキンEを継手体Bに押し込む管継手が知られている。
【0009】
継手体Bは、端部の内周面に設けられたパッキンEが収容される収容凹部B1と、その外面に形成されたフランジB3とによって構成され、収容凹部B1には、継手体Bの中央側より断面が楔形のパッキンE、パッキン押えG、ロックリングFが配置され、内周面に径の収縮を防止するインコアDが装着された流体管Pが挿入されている。
【0010】
押輪Hの内周面には、継手体B側に向かって拡径するテーパ面H1が形成され、外面には、継手体BのフランジB3に対応するフランジH2が設けてあり、ボルト・ナットIによって継手体Bに取り付けられる。
【0011】
ロックリングFの外周面には、テーパ面H1に当接するテーパ面E2が形成され、内周面には、流体管Pの外周面に食い込む刃F1が形成されている。
【0012】
【発明が解決しようとする課題】
上記の管継手においては、ロックリングを縮径させるのに袋ナットや押輪を用いており、ねじ部を形成するために継手体や袋ナットの肉厚を厚くしてねじ加工を行い、あるいは、フランジを設けるために継手全体の肉厚を厚くするなどにより製造コストが高くなっていた。
【0013】
また、ねじが緩んだり、ボルトのナットが緩んだりしロックリングの押し込みが不足して流体管が抜け出す恐れがあった。
【0014】
本発明が解決しようとする課題は、上記問題を解決するためになされたもので、製造コストを低くし、管の抜け出しを確実に防止する管継手を提供する点にある。
【0015】
【課題を解決するための手段】
上記課題を解決するために、本発明の管継手は、流体管を水密に接合するパッキンと、流体管の外周面に食い込む刃が内周面に形成されたロックリングとを内装する環状溝が内面に形成された継手体に、合成樹脂製の流体管を挿入し、少なくともロックリングの収容された前記環状溝の所定の部分を外方から塑性変形させて、ロックリングを流体管の外周面に係止させると共に、前記パッキンが収容されている環状溝の内周面とパッキンの外周面との間に、圧力分散部材が配置され、前記環状溝を塑性変形させて前記圧力分散部材を縮径させ前記パッキンを環状溝の内周面と流体管の外周面に圧接させることを特徴としている。
【0016】
この特徴により、継手体の環状溝を外部より圧力を加えて継手体の中心方向に押し出すように塑性変形させてロックリングを縮径させるのみで、流体管の抜け出し防止とシールが完了する。このように管継手は、継手体と、パッキンと、ロックリングとの3点で構成され、部品点数を少なくすることができ、また、ねじ部やフランジ部が必要ないので継手体の肉厚を薄くすることが可能となり、製品コストを低くすることができる。
【0017】
また、継手体を塑性変形させてロックリングの縮径を保持しているので、ねじやボルトが緩むような心配もなく、抜出阻止力が安定する。
また、内径を流体管の外径よりも大きく形成したパッキンを環状溝に装着することができるようになるので、継手体に流体管を挿入するときにパッキンの摩擦による挿入抵抗が無くなり、流体管の挿入作業が楽に行え、流体管の接合の作業性が向上する。
更に、環状溝を塑性変形させることによって縮径する圧力分散部材が配置されているので、環状溝の塑性変形がパッキンに対して不均一であっても縮径された圧力分散部材によってパッキンは均等に圧縮されるのでパッキンの止水性が向上する。
【0018】
前記ロックリングには、継手体の端部に向かって縮径する外テーパ面が形成されるとともに、環状溝には前記外テーパ面に当接し、継手体の端部に向かって縮径する内テーパ面が形成されているのが好ましい。
【0019】
このようにすることで、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングの外テーパ面が継手体の内テーパ面に当接し、くさび作用によってロックリングが縮径されて流体管の外周面にさらに食い込み、抜出阻止力が向上する。
【0020】
他の本発明の管継手は、流体管を水密に接合するパッキンと、流体管の外周面に食い込む刃が内周面に形成されたロックリングとを内装する環状溝が内面に形成された継手体に、合成樹脂製の流体管を挿入し、少なくともロックリングの収容された前記環状溝の所定の部分を外方から塑性変形させて、ロックリングを流体管の外周面に係止させると共に、前記ロックリングには、継手体の端部に向かって縮径する外テーパ面が形成され、該外テーパ面に当接し、継手体の端部に向かって縮径する内テーパ面が形成された補助部材を環状溝の内周面とロックリングの外周面との間に配置すると共に、前記補助部材にはパッキンの継手体端部側の面に当接する区画片が内周側に突出して設けられていることを特徴としている。
【0021】
このようにすることで、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングの外テーパ面が内テーパ面に当接し、くさび作用によってロックリングが縮径されて流体管の外周面にさらに食い込み、抜出阻止力が向上し、また、継手体の塑性変形が部分的な変形であっても縮径した補助部材がロックリングの外周面にほぼ全周に渡って接触するのでロックリングを均等に縮径することができ、抜出阻止力が向上する。
【0023】
また、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングが継手体の端部側に移動してもパッキンは区画片に当接するので、パッキンの止水性能が安定して保たれる。
【0024】
前記環状溝は、パッキンが収容されるパッキン溝と、ロックリングが装着されるロックリング溝とが別々に形成されているのが好ましい。
【0025】
このようにすることで、パッキンとロックリングが別々の溝に配置されるので、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングが継手体の端部側に移動してもパッキンは移動することがなく止水性能安定して保たれる。
【0026】
パッキンが収容されている環状溝の内周面とパッキンの外周面との間に、圧力分散部材が配置され、環状溝を塑性変形させて、圧力分散部材を縮径させパッキンを環状溝の内周面と流体管の外周面に圧接させるのが好ましい。
【0027】
このようにすることで、内径を流体管の外径よりも大きく形成したパッキンを環状溝に装着することができるようになるので、継手体に流体管を挿入するときにパッキンの摩擦による挿入抵抗が無くなり、流体管の挿入作業が楽に行え、流体管の接合の作業性が向上する。
【0029】
また、環状溝を塑性変形させることによって縮径する圧力分散部材が配置されているので、環状溝の塑性変形がパッキンに対して不均一であっても縮径された圧力分散部材にってパッキンは均等に圧縮されるのでパッキンの止水性が向上する。
【0030】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明する。
【0031】
図1ないし図3は、本発明の管継手1を用いてポリエチレン製の流体管2、2を接合した第1実施例を示している。
【0032】
同図において、3は、ステンレス製の継手体、4は、環状溝3aの内周面に配置されるロックリング、5は、流体管2を継手体3に水密に接合するパッキン、6は、流体管2の端部内周に装着されたインコア、7は、塑性変形部を示している。
【0033】
継手体3の両端部分には、ロックリング4とパッキン5とが収容される環状溝3aが形成され、端部側には、端部に向かって縮径する内テーパ面3bが設けられており、その先端は内周側に突出した突出片3cが形成されているている。また、継手体3の内面中央には管中心方向に突出したストッパー3dが設けられている。
【0034】
ロックリング4は、図3に示すように、流体管2よりも硬質の合成樹脂、例えばアセタール樹脂等やステンレス製等の金属体からなる1つ割りの形状をしており、縮径させても元の形状に戻る弾性を有し、外周面には継手体3の内テーパ面3bとほぼ同じ傾斜の外テーパ面4aが形成され、内周面には、円周方向を向く複数の刃4bが形成されている。
【0035】
パッキン5は、継手体3の中央側にリップ部5aが形成されたセルフシールの形状となっている。
【0036】
インコア6は、外径が流体管2の内径とほぼ等しく形成され、一方の端部には外径方向に突出した鍔部6aが形成されている。
【0037】
上記実施例の管継手1を用いて、流体管2を接合するには、まず、接合する流体管2の端部に鍔部6aが当接するまでインコア6を挿入する。
【0038】
次に、環状溝3aにロックリング4とパッキン5を装着した継手体3に、インコア6が内部に装着された流体管2を所定寸法挿入する。
【0039】
ついで、加圧器でロックリング4が収容してある環状溝3aの一部を外周面より圧縮し、内径方向に突出するように塑性変形させて塑性変形部7を加工し、ロックリング4を縮径させることによって流体管2の外周面に刃4bを食い込ませ接合を完了する。
【0040】
加圧器は、継手体3の外周面の接線に平行な平面を部分的に設けるものでもよく(図2(a))、また、円周方向に連続した帯状に継手体3を塑性変形させるものでもよい(図2(b))。
【0041】
図4の(a)は、環状溝3aにロックリング4およびパッキン5が装着された継手体3に流体管2が挿入されている状態を示している。
ロックリング4の刃4bは、流体管2の外周面に接触しており、パッキン5は、環状溝3aの内周面と流体管2の外周面とに圧接されている。
【0042】
図4の(b)は、ロックリング4が装着された継手体3の一部を加圧器によって塑性変形させた状態を示している。
加圧器によって内周方向に突出する状態で塑性変形させられた塑性変形部7によって、ロックリング4は縮径し、刃4bが流体管2の外周面に食い込んでいる。
【0043】
図4の(c)は、流体管2に抜出力が働き、継手体3と流体管2が相対移動した状態を示している。
継手体3と流体管2が相対移動したことによって、ロックリング4の外テーパ面4aと継手体3の内テーパ面3bが当接し、くさび作用によってロックリング4の刃4bが流体管2に更に食い込み、ロックリング4と突出片3cが係合し流体管の抜け出しが防止される。
【0044】
本管継手においては、上記のように継手体3と、ロックリング4と、パッキン5の3点で構成されるので、従来の管継手に比べて部品点数が少なく、また、ねじ部やフランジ部が必要ないので肉厚を薄くすることができるので製造コストが低い。また、ロックリング4を継手体3の塑性変形によって縮径させているので、抜出阻止力が安定して発揮される。
【0045】
図5は、本発明の第2実施例を示し、継手体3、ロックリング4、パッキン5は第1実施例とほぼ同様に構成され、継手体3の環状溝3aの内周面とロックリング4の外周面の間に補助部材8が設けられている。
補助部材8は、縮径可能な1つ割りの形状をしており、継手体3端部側の内周面にロックリング4の外テーパ面4aが当接する内テーパ面8aが形成され、反対側の端部には内径方向に突出した区画片8bが設けられている。
【0046】
上記第2実施例の管継手1を用いて、流体管2を接続するには、第1実施例と同様な方法で行われる。
【0047】
図5(a)は、環状溝3aにパッキン5、補助部材8が配置され、補助部材8の内部にロックリング4が設置された継手体3に流体管2を挿入した状態を示している。
ロックリング4の刃4bは、流体管2の外周面に接触しており、パッキン5は、環状溝3aの内周面と流体管2の外周面とに圧接され、補助部材8の区画片8bに当接して継手体3の端部方向に移動しない状態になっている。
【0048】
図5(b)は、補助部材8が装着された継手体3の一部を加圧器によって塑性変形させた状態を示している。
加圧器によって内周方向に突出する状態で塑性変形させられた塑性変形部7によって補助部材8が縮径され、その内周面がロックリング4の外周面にほぼ均等に当接してロックリングを縮径させ、刃4bを流体管2の外周面に食い込ませている。
【0049】
図5(c)は、流体管2に抜出力が働き、継手体3と流体管2が相対移動した状態を示している。
継手体3と流体管2が相対移動したことによって、ロックリング4の外テーパ面4aと補助部材8の内テーパ面8aが当接し、くさび作用によってロックリング4の刃4bが流体管2に更に食い込み、ロックリング4と突出片3cが係合し流体管の抜け出しが防止される。
【0050】
第2実施例の管継手においては、補助部材11に内テーパ面11aが形成されているので環状溝3aには内テーパ面が必要なく、継手体の外周面にテーパ面ができないので加圧器による塑性変形の作業が容易となる。
また、ロックリング4が管継手3の端部方向に移動しても、パッキン5は区画片8bに当接し移動することがないので安定した止水性が確保される。
【0051】
図6は、本発明の第3実施例を示し、ロックリング溝9とパッキン溝10とが継手体3の内周面に形成され、それぞれの溝にロックリング4、パッキン5が配置されている。
【0052】
ロックリング溝9の端部側には、ロックリング4の外テーパ面4aに当接する内テーパ面9aが形成されており、パッキン溝10の内周面とパッキン5の外周面の間には一つ割の円筒状に形成されている圧力分散部材11が配置されている。
【0053】
上記第3実施例の管継手1を用いて、流体管2を接続するには、第1実施例と同様な方法で行われる。
【0054】
ロックリング溝9とパッキン溝10とにロックリング4とパッキン5をそれぞれに配置した継手体3に、インコア6を取り付けた流体管2を挿入する。
パッキン5の内径は、流体管2の外径とほぼ同じか若干大きく形成されている。
【0055】
ロックリング溝9とパッキン溝10とを外周より加圧器によって内径方向に突出するように塑性変形させ塑性変形部7を加工する。
ロックリング4は塑性変形部7によって縮径され、流体管2の外周面に刃4bを食い込ませる。圧力分散部材11も塑性変形部7によって縮径され、パッキン5を外周面から押圧し、パッキン5を流体管2の外周面に圧接させる。
【0056】
第3実施例の管継手においては、ロックリング4とパッキン5は別々の溝に配置されるので、流体管2と継手体3が相対移動してロックリング4が管継手3の端部方向に移動しても、パッキン5は移動することがない。
【0057】
圧力分散部材11がパッキン溝10の内周面とパッキン5の外周面の間に配置されているので、塑性変形が円周に対して不均一であっても圧力分散部材11が縮径しパッキン5の外周面を均等に押圧するのでパッキンの確実な止水性が確保される。
【0058】
本発明は、上記実施例に限定されるものではない。実施例では、流体管を挿入したときにロックリングの刃が流体管の外周面に接しているが、ロックリングの内径を大きく形成して接しないようにしてもよい。また、実施例でのロックリングは、1つ割りの形状をしているが円弧状の複数のリング体を変形可能に連結したロックリングを用いてもよい。実施例での区画片は補助部材と一体に設けられているが、別体としてもよい。
【0059】
【発明の効果】
本発明によれば、継手体の環状溝を外部より圧力を加えて継手体の中心方向に押し出すように塑性変形させてロックリングを縮径させるのみで、流体管の抜け出し防止とシールが完了する。このように管継手は、継手体と、パッキンと、ロックリングとの3点で構成され、部品点数を少なくすることができ、また、ねじ部やフランジ部が必要ないので継手体の肉厚を薄くすることが可能となり、製品コストを低くすることができる。
【0060】
また、継手体を塑性変形させてロックリングの縮径を保持しているので、ねじやボルトが緩むような心配がなく、抜出阻止力が安定する。
また、内径を流体管の外径よりも大きく形成したパッキンを環状溝に装着することができるようになるので、継手体に流体管を挿入するときにパッキンの摩擦による挿入抵抗が無くなり、流体管の挿入作業が楽に行え、流体管の接合の作業性が向上する。
更に、環状溝を塑性変形させることによって縮径する圧力分散部材が配置されているので、環状溝の塑性変形がパッキンに対して不均一であっても縮径された圧力分散部材によってパッキンは均等に圧縮されるのでパッキンの止水性が向上する。
【0061】
請求項2の発明によれば、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングの外テーパ面が継手体の内テーパ面に当接し、くさび作用によってロックリングが縮径されて流体管の外周面にさらに食い込み、抜出阻止力が向上する。
【0062】
請求項3の発明によれば、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングの外テーパ面が内テーパ面に当接し、くさび作用によってロックリングが縮径されて流体管の外周面にさらに食い込み、抜出阻止力が向上し、また、継手体の塑性変形が部分的な変形であっても縮径した補助部材がロックリングの外周面にほぼ全周に渡って接触するのでロックリングを均等に縮径することができ、抜出阻止力が向上する。
【0063】
また、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングが継手体の端部側に移動してもパッキンは区画片に当接するので、パッキンの止水性能が安定して保たれる。
【0064】
請求項の発明によれば、パッキンとロックリングが別々の溝に配置されるので、流体管に抜出力が働き、流体管と継手体が相対移動したときに、ロックリングが継手体の端部側に移動してもパッキンは移動することがなく止水性能安定して保たれる。
【0065】
請求項の発明によれば、内径を流体管の外径よりも大きく形成したパッキンを環状溝に装着することができるようになるので、継手体に流体管を挿入するときにパッキンの摩擦による挿入抵抗が無くなり、流体管の挿入作業が楽に行え、流体管の接合の作業性が向上する。
【0066】
また、環状溝を塑性変形させることによって縮径する圧力分散部材が配置されているので、環状溝の塑性変形がパッキンに対して不均一であっても縮径された圧力分散部材にってパッキンは均等に圧縮されるのでパッキンの止水性が向上する。
【0067】
【図面の簡単な説明】
【図1】本発明の第1実施例を示す一部切欠正面図である。
【図2】同じく、(a)は断続塑性変形時の側面図、(b)は連続溝状塑性変形時の側面図である。
【図3】同じく、(a)はロックリングを示す側面図、(b)はロックリングを示す断面図である。
【図4】同じく、接合時の説明断面図であり、(a)は流体管挿入時、(b)は接合完了時、(c)は流体管抜出時である。
【図5】本発明の第2実施例を示す要部断面図であり、(a)は流体管挿入時、(b)は接合完了時、(c)は流体管抜出時である。
【図6】本発明の第3実施例を示す要部断面図である。
【図7】従来例を示す一部切欠正面図である。
【図8】同じく、(a)はロックリングの一部切欠正面図、(b)はロックリングの側面図である。
【図9】別の従来例を示す要部断面図である。
【符号の説明】
1 管継手
2 流体管
3 継手体
3a 環状溝
3b 内テーパ面
3c 突出片
3d ストッパー
4 ロックリング
4a 外テーパ面
4b 刃
5 パッキン
5a リップ部
6 インコア
6a 鍔部
7 塑性変形部
8 補助部材
8a 内テーパ面
8b 区画片
9 ロックリング溝
10 パッキン溝
11 圧力分散部材
[0001]
BACKGROUND OF THE INVENTION
The present invention is a pipe joint for joining fluid pipes used for water pipes, gas pipes, plant pipes, etc., and the fluid pipe is inserted into a joint body to which a packing is attached, and the diameter of the lock ring is reduced to reduce the fluid. The present invention relates to a pipe joint that prevents the pipe from coming out.
[0002]
[Prior art]
Pipe joints as shown in FIGS. 7 and 8 are known as joints for connecting fluid pipes P such as polyethylene pipes deformed by external pressure.
[0003]
This conventional pipe joint A includes a joint body B, a cap nut C screwed into the joint body B, an in-core D inserted into the inner surface of the fluid pipe, a packing E, a split lock ring F, and a packing presser G. .
[0004]
The joint body B is provided with an accommodation recess B1 for accommodating the packing E on the inner surface of the end portion, and an internal thread portion B2 into which the cap nut C is screwed is formed on the end side. A male screw portion C1 is formed on the outer diameter portion of the cap nut C on the joint body B side, and an inner peripheral surface thereof is provided with a tapered surface C2 that expands toward the packing E side. The in-core D has a strength capable of preventing deformation of the fluid pipe, and the outer diameter is set to be substantially equal to the inner diameter of the fluid pipe P. The chamfering D1 is provided at one end and the outer diameter direction is provided at the other end. A flange portion D2 protruding in the shape is formed. The lock ring F is formed in the shape of one part with a reduced diameter, in which a blade F1 that bites into the outer surface of the fluid pipe P is formed on the inner surface, and a tapered surface F2 that is in close contact with the tapered surface C2 of the cap nut C is formed on the outer surface. ing.
[0005]
In order to connect the fluid pipe P to the joint A, first, the in-core D is inserted into the inner diameter of the fluid pipe P. Next, the cap nut C, the lock ring F, the packing retainer G, and the packing E are fitted on the fluid pipe P in this order. The fluid pipe P with externally fitted parts is inserted into the joint body B, and the male thread portion C1 of the cap nut C is screwed into the female thread portion B2 of the joint body B and tightened.
[0006]
The lock ring F is pushed by the tapered surface C2 of the cap nut C and moves in the direction of the joint body B, and the packing retainer G and the packing E are placed in the housing recess B1 of the joint body B by being placed on the plane of the end of the lock ring F. Be contained.
[0007]
At this time, the cap nut C moves in the direction of the joint body B while rotating, and reduces the diameter of the lock ring F at the tapered surface C2. The blade F1 of the lock ring F bites into the outer diameter of the fluid pipe P, and the incore D prevents deformation of the fluid pipe P, thereby preventing the fluid pipe P from being detached from the pipe joint A and being connected.
[0008]
As another conventional example, there is known a pipe joint in which a lock ring F is pushed by a pusher wheel H as shown in FIG. 9 and the lock ring F pushes the packing E into the joint body B through the packing presser G.
[0009]
The joint body B is configured by a housing recess B1 in which a packing E provided on the inner peripheral surface of the end portion is housed, and a flange B3 formed on the outer surface thereof, and the housing recess B1 includes a center of the joint body B. From the side, a wedge-shaped packing E, a packing presser G, and a lock ring F are arranged, and a fluid pipe P with an in-core D that prevents diameter shrinkage is inserted on the inner peripheral surface.
[0010]
A tapered surface H1 having a diameter increasing toward the joint body B side is formed on the inner peripheral surface of the presser wheel H, and a flange H2 corresponding to the flange B3 of the joint body B is provided on the outer surface. Is attached to the joint body B.
[0011]
A tapered surface E2 that abuts the tapered surface H1 is formed on the outer peripheral surface of the lock ring F, and a blade F1 that bites into the outer peripheral surface of the fluid pipe P is formed on the inner peripheral surface.
[0012]
[Problems to be solved by the invention]
In the above pipe joint, a cap nut or a push ring is used to reduce the diameter of the lock ring, and a thread is formed by increasing the wall thickness of the joint body or cap nut to form a threaded portion, or The manufacturing cost has been increased by increasing the thickness of the entire joint in order to provide the flange.
[0013]
Further, there is a possibility that the fluid pipe may come out due to the screw being loosened or the bolt nut being loosened, and the lock ring being pushed in insufficiently.
[0014]
The problem to be solved by the present invention is to solve the above-mentioned problems, and is to provide a pipe joint that lowers the manufacturing cost and reliably prevents the pipe from coming out.
[0015]
[Means for Solving the Problems]
In order to solve the above-described problems, the pipe joint of the present invention includes an annular groove that includes a packing for watertightly joining a fluid pipe and a lock ring having a blade that bites into the outer circumference of the fluid pipe formed on the inner circumference. A fluid pipe made of synthetic resin is inserted into the joint formed on the inner surface, and at least a predetermined portion of the annular groove in which the lock ring is accommodated is plastically deformed from the outside. And a pressure distribution member is disposed between the inner peripheral surface of the annular groove in which the packing is accommodated and the outer peripheral surface of the packing, and the pressure distribution member is contracted by plastic deformation of the annular groove. It is characterized in that the packing is pressed against the inner peripheral surface of the annular groove and the outer peripheral surface of the fluid pipe .
[0016]
With this feature, the fluid pipe is prevented from coming out and sealed only by reducing the diameter of the lock ring by plastically deforming the annular groove of the joint body so as to be pushed out toward the center of the joint body by applying pressure from the outside. As described above, the pipe joint is composed of the joint body, the packing, and the lock ring, so that the number of parts can be reduced, and the threaded portion and the flange portion are not required. It is possible to reduce the thickness and reduce the product cost.
[0017]
In addition, since the joint body is plastically deformed to maintain the reduced diameter of the lock ring, there is no concern that the screws and bolts will be loosened, and the withdrawal preventing force is stabilized.
Further, since the packing having an inner diameter larger than the outer diameter of the fluid pipe can be mounted in the annular groove, the insertion resistance due to the friction of the packing is eliminated when the fluid pipe is inserted into the joint body. Can be easily inserted and the workability of joining the fluid pipes is improved.
In addition, since the pressure dispersion member that reduces the diameter by plastic deformation of the annular groove is disposed, even if the plastic deformation of the annular groove is not uniform with respect to the packing, the packing is evenly distributed by the reduced pressure distribution member. Because of being compressed, the water tightness of the packing is improved.
[0018]
The lock ring has an outer tapered surface that decreases in diameter toward the end of the joint body, and the annular groove abuts on the outer taper surface and decreases in diameter toward the end of the joint body. A tapered surface is preferably formed.
[0019]
By doing so, the output force acts on the fluid pipe, and when the fluid pipe and the joint body move relative to each other, the outer taper surface of the lock ring comes into contact with the inner taper surface of the joint body, and the lock ring is moved by the wedge action. The diameter is reduced to further bite into the outer peripheral surface of the fluid pipe, and the withdrawal preventing force is improved.
[0020]
Another pipe joint of the present invention is a joint in which an annular groove is formed on the inner surface, which includes a packing for watertightly joining a fluid pipe and a lock ring in which a blade that bites into the outer peripheral surface of the fluid pipe is formed on the inner peripheral surface. Inserting a fluid pipe made of synthetic resin into the body, plastically deforming at least a predetermined portion of the annular groove in which the lock ring is accommodated from the outside, and locking the lock ring to the outer peripheral surface of the fluid pipe, The lock ring has an outer tapered surface that decreases in diameter toward the end of the joint body, and an inner tapered surface that contacts the outer tapered surface and decreases in diameter toward the end of the joint body. The auxiliary member is disposed between the inner peripheral surface of the annular groove and the outer peripheral surface of the lock ring, and the auxiliary member is provided with a partition piece that protrudes toward the inner peripheral side of the auxiliary member at the end of the packing on the joint body end side. It is characterized by being.
[0021]
By doing so, the output force acts on the fluid pipe, and when the fluid pipe and the joint body move relative to each other, the outer tapered surface of the lock ring comes into contact with the inner tapered surface, and the diameter of the lock ring is reduced by the wedge action. In this way, the outer peripheral surface of the fluid pipe further bites into the outer surface of the fluid pipe to improve the pull-out prevention force, and even if the plastic deformation of the joint body is a partial deformation, the reduced diameter of the auxiliary member almost completely surrounds the outer surface of the lock ring. Since they come in contact with each other, the diameter of the lock ring can be reduced evenly, and the withdrawal preventing force is improved.
[0023]
In addition, when the fluid pipe and the joint body move relative to each other, when the fluid pipe and the joint body move relative to each other, even if the lock ring moves toward the end of the joint body, the packing will abut against the partition piece. Is kept stable.
[0024]
It is preferable that the annular groove is formed separately with a packing groove in which the packing is accommodated and a lock ring groove in which the lock ring is mounted.
[0025]
By doing so, since the packing and the lock ring are arranged in separate grooves, the output force acts on the fluid pipe, and when the fluid pipe and the joint body move relative to each other, the lock ring moves to the end side of the joint body. The packing does not move even when moved to, and the water stop performance is kept stable.
[0026]
A pressure dispersion member is disposed between the inner circumferential surface of the annular groove in which the packing is accommodated and the outer circumferential surface of the packing, and the annular groove is plastically deformed to reduce the diameter of the pressure dispersion member, so that the packing is placed inside the annular groove. It is preferable to press the peripheral surface and the outer peripheral surface of the fluid pipe.
[0027]
By doing so, it becomes possible to attach a packing having an inner diameter larger than the outer diameter of the fluid pipe to the annular groove, so that when the fluid pipe is inserted into the joint body, the insertion resistance due to the friction of the packing The fluid pipe can be inserted easily, and the fluid pipe joining workability is improved.
[0029]
In addition, since the pressure dispersion member that reduces the diameter by plastically deforming the annular groove is disposed, even if the plastic deformation of the annular groove is not uniform with respect to the packing, the pressure dispersion member is reduced in diameter by the reduced pressure dispersion member. Since it is compressed evenly, the waterproofness of the packing is improved.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0031]
1 to 3 show a first embodiment in which polyethylene fluid pipes 2 and 2 are joined using a pipe joint 1 of the present invention.
[0032]
In the same figure, 3 is a stainless steel joint body, 4 is a lock ring disposed on the inner peripheral surface of the annular groove 3a, 5 is a packing for watertightly joining the fluid pipe 2 to the joint body 3, and 6 is An in-core 7 attached to the inner periphery of the end of the fluid pipe 2 indicates a plastic deformation portion.
[0033]
An annular groove 3a in which the lock ring 4 and the packing 5 are accommodated is formed at both ends of the joint body 3, and an inner tapered surface 3b that is reduced in diameter toward the end is provided on the end side. The tip is formed with a protruding piece 3c protruding toward the inner peripheral side. Further, a stopper 3d protruding in the tube center direction is provided at the center of the inner surface of the joint body 3.
[0034]
As shown in FIG. 3, the lock ring 4 has a split shape made of a synthetic resin harder than the fluid pipe 2, for example, a metal body such as acetal resin or stainless steel. The outer tapered surface 4a is formed on the outer peripheral surface and has the same inclination as the inner tapered surface 3b of the joint body 3, and a plurality of blades 4b facing the circumferential direction are formed on the inner peripheral surface. Is formed.
[0035]
The packing 5 has a self-sealing shape in which a lip portion 5 a is formed on the center side of the joint body 3.
[0036]
The in-core 6 has an outer diameter that is substantially equal to the inner diameter of the fluid pipe 2, and a flange 6 a that protrudes in the outer diameter direction is formed at one end.
[0037]
In order to join the fluid pipe 2 using the pipe joint 1 of the above embodiment, first, the in-core 6 is inserted until the flange part 6a comes into contact with the end of the fluid pipe 2 to be joined.
[0038]
Next, the fluid pipe 2 in which the in-core 6 is mounted is inserted into the joint body 3 in which the lock ring 4 and the packing 5 are mounted in the annular groove 3a.
[0039]
Next, a part of the annular groove 3a in which the lock ring 4 is accommodated is compressed from the outer peripheral surface by a pressurizer and plastically deformed so as to protrude in the inner diameter direction to process the plastic deformed portion 7, and the lock ring 4 is contracted. By making the diameter, the blade 4b is bitten into the outer peripheral surface of the fluid pipe 2 to complete the joining.
[0040]
The pressurizer may be partially provided with a plane parallel to the tangent to the outer peripheral surface of the joint body 3 (FIG. 2 (a)), or it may plastically deform the joint body 3 in a continuous belt shape in the circumferential direction. It may be (FIG. 2B).
[0041]
FIG. 4A shows a state where the fluid pipe 2 is inserted into the joint body 3 in which the lock ring 4 and the packing 5 are mounted in the annular groove 3a.
The blade 4 b of the lock ring 4 is in contact with the outer peripheral surface of the fluid tube 2, and the packing 5 is pressed against the inner peripheral surface of the annular groove 3 a and the outer peripheral surface of the fluid tube 2.
[0042]
FIG. 4B shows a state in which a part of the joint body 3 to which the lock ring 4 is attached is plastically deformed by a pressurizer.
The lock ring 4 is reduced in diameter by the plastic deformation portion 7 that is plastically deformed in a state of protruding in the inner peripheral direction by the pressurizer, and the blade 4 b bites into the outer peripheral surface of the fluid pipe 2.
[0043]
(C) of FIG. 4 shows a state in which the output force acts on the fluid pipe 2 and the joint body 3 and the fluid pipe 2 are relatively moved.
By the relative movement of the joint body 3 and the fluid pipe 2, the outer taper surface 4a of the lock ring 4 and the inner taper face 3b of the joint body 3 come into contact with each other, and the blade 4b of the lock ring 4 is further brought into contact with the fluid pipe 2 by the wedge action. The bite and the lock ring 4 and the protruding piece 3c are engaged to prevent the fluid pipe from coming out.
[0044]
Since the main pipe joint is composed of the joint body 3, the lock ring 4, and the packing 5 as described above, the number of parts is smaller than that of the conventional pipe joint, and the threaded portion and the flange portion are also included. Is not necessary, so the wall thickness can be reduced, and the manufacturing cost is low. Moreover, since the diameter of the lock ring 4 is reduced by plastic deformation of the joint body 3, the withdrawal preventing force is stably exhibited.
[0045]
FIG. 5 shows a second embodiment of the present invention, wherein the joint body 3, the lock ring 4, and the packing 5 are configured in substantially the same manner as the first embodiment, and the inner peripheral surface of the annular groove 3a of the joint body 3 and the lock ring. An auxiliary member 8 is provided between the four outer peripheral surfaces.
The auxiliary member 8 has a shape that can be reduced in one part, and an inner tapered surface 8a that contacts the outer tapered surface 4a of the lock ring 4 is formed on the inner peripheral surface on the joint body 3 end side. A partition piece 8b protruding in the inner diameter direction is provided at the end on the side.
[0046]
To connect the fluid pipe 2 using the pipe joint 1 of the second embodiment, the same method as in the first embodiment is performed.
[0047]
FIG. 5A shows a state in which the fluid pipe 2 is inserted into the joint body 3 in which the packing 5 and the auxiliary member 8 are arranged in the annular groove 3 a and the lock ring 4 is installed inside the auxiliary member 8.
The blade 4 b of the lock ring 4 is in contact with the outer peripheral surface of the fluid pipe 2, and the packing 5 is pressed against the inner peripheral surface of the annular groove 3 a and the outer peripheral surface of the fluid pipe 2, and the partition piece 8 b of the auxiliary member 8. Is in a state where it does not move toward the end of the joint body 3.
[0048]
FIG. 5B shows a state in which a part of the joint body 3 to which the auxiliary member 8 is attached is plastically deformed by a pressurizer.
The auxiliary member 8 is reduced in diameter by the plastic deformation portion 7 that is plastically deformed in a state of projecting in the inner circumferential direction by the pressurizer, and the inner circumferential surface abuts the outer circumferential surface of the lock ring 4 almost evenly so that the lock ring is moved. The blade 4b is bitten into the outer peripheral surface of the fluid pipe 2 by reducing the diameter.
[0049]
FIG. 5 (c) shows a state in which the extraction output acts on the fluid pipe 2 and the joint body 3 and the fluid pipe 2 are relatively moved.
By the relative movement of the joint body 3 and the fluid pipe 2, the outer taper surface 4 a of the lock ring 4 and the inner taper surface 8 a of the auxiliary member 8 come into contact with each other, and the blade 4 b of the lock ring 4 further contacts the fluid pipe 2 by the wedge action. The bite and the lock ring 4 and the protruding piece 3c are engaged to prevent the fluid pipe from coming out.
[0050]
In the pipe joint of the second embodiment, since the inner taper surface 11a is formed on the auxiliary member 11, the inner groove surface is not necessary for the annular groove 3a, and the outer peripheral surface of the joint body cannot be tapered. Work of plastic deformation becomes easy.
Further, even if the lock ring 4 moves in the direction of the end of the pipe joint 3, the packing 5 does not contact the partition piece 8b and does not move, so that stable water stopping is ensured.
[0051]
FIG. 6 shows a third embodiment of the present invention, in which a lock ring groove 9 and a packing groove 10 are formed on the inner peripheral surface of the joint body 3, and a lock ring 4 and a packing 5 are arranged in each groove. .
[0052]
An inner tapered surface 9 a that contacts the outer tapered surface 4 a of the lock ring 4 is formed on the end portion side of the lock ring groove 9, and there is no gap between the inner peripheral surface of the packing groove 10 and the outer peripheral surface of the packing 5. A pressure dispersion member 11 formed in a split cylindrical shape is disposed.
[0053]
To connect the fluid pipe 2 using the pipe joint 1 of the third embodiment, the same method as in the first embodiment is performed.
[0054]
The fluid pipe 2 to which the in-core 6 is attached is inserted into the joint body 3 in which the lock ring 4 and the packing 5 are respectively arranged in the lock ring groove 9 and the packing groove 10.
The inner diameter of the packing 5 is substantially the same as or slightly larger than the outer diameter of the fluid pipe 2.
[0055]
The plastic ring deformed portion 7 is processed by plastically deforming the lock ring groove 9 and the packing groove 10 so that the lock ring groove 9 and the packing groove 10 protrude from the outer periphery toward the inner diameter direction by a pressurizer.
The diameter of the lock ring 4 is reduced by the plastic deformation portion 7, and the blade 4 b is bite into the outer peripheral surface of the fluid pipe 2. The pressure dispersion member 11 is also reduced in diameter by the plastic deformation portion 7, presses the packing 5 from the outer peripheral surface, and presses the packing 5 against the outer peripheral surface of the fluid pipe 2.
[0056]
In the pipe joint of the third embodiment, since the lock ring 4 and the packing 5 are arranged in separate grooves, the fluid pipe 2 and the joint body 3 move relative to each other so that the lock ring 4 moves toward the end of the pipe joint 3. Even if it moves, the packing 5 does not move.
[0057]
Since the pressure dispersion member 11 is disposed between the inner peripheral surface of the packing groove 10 and the outer peripheral surface of the packing 5, even if the plastic deformation is not uniform with respect to the circumference, the pressure dispersion member 11 is reduced in diameter and packing is performed. Since the outer peripheral surface of 5 is pressed evenly, a reliable water-proofing of the packing is ensured.
[0058]
The present invention is not limited to the above embodiments. In the embodiment, the blade of the lock ring is in contact with the outer peripheral surface of the fluid pipe when the fluid pipe is inserted, but the inner diameter of the lock ring may be formed so as not to contact. Moreover, although the lock ring in an Example is carrying out the shape of 1 part, you may use the lock ring which connected the circular shaped ring body so that a deformation | transformation was possible. The partition piece in the embodiment is provided integrally with the auxiliary member, but may be a separate body.
[0059]
【The invention's effect】
According to the present invention, fluid pipes can be prevented from slipping out and sealed only by reducing the diameter of the lock ring by plastically deforming the annular groove of the joint body so as to be pushed out toward the center of the joint body by applying pressure from the outside. . As described above, the pipe joint is composed of the joint body, the packing, and the lock ring, so that the number of parts can be reduced, and the threaded portion and the flange portion are not required. It is possible to reduce the thickness and reduce the product cost.
[0060]
In addition, since the joint body is plastically deformed to maintain the reduced diameter of the lock ring, there is no fear that the screws and bolts are loosened, and the extraction preventing force is stabilized.
Further, since the packing having an inner diameter larger than the outer diameter of the fluid pipe can be mounted in the annular groove, the insertion resistance due to the friction of the packing is eliminated when the fluid pipe is inserted into the joint body. Can be easily inserted and the workability of joining the fluid pipes is improved.
In addition, since the pressure dispersion member that reduces the diameter by plastic deformation of the annular groove is disposed, even if the plastic deformation of the annular groove is not uniform with respect to the packing, the packing is evenly distributed by the reduced pressure distribution member. Because of being compressed, the water tightness of the packing is improved.
[0061]
According to the second aspect of the present invention, when the fluid pipe and the joint body move relative to each other and the fluid pipe and the joint body move relative to each other, the outer taper surface of the lock ring comes into contact with the inner taper surface of the joint body and is locked by the wedge action. The ring is reduced in diameter to further bite into the outer peripheral surface of the fluid pipe, and the pull-out prevention force is improved.
[0062]
According to the third aspect of the present invention, when the fluid pipe and the joint body move relative to each other and the fluid pipe and the joint body move relative to each other, the outer taper surface of the lock ring comes into contact with the inner taper surface, and the lock ring is contracted by the wedge action. The outer diameter of the fluid pipe further penetrates into the outer peripheral surface of the fluid pipe to improve the pull-out prevention force, and even if the plastic deformation of the joint body is a partial deformation, the reduced diameter auxiliary member is almost completely applied to the outer peripheral surface of the lock ring. Since the contact is made over the circumference, the diameter of the lock ring can be reduced evenly, and the withdrawal preventing force is improved.
[0063]
In addition, when the fluid pipe and the joint body move relative to each other, when the fluid pipe and the joint body move relative to each other, even if the lock ring moves toward the end of the joint body, the packing will abut against the partition piece. Is kept stable.
[0064]
According to the invention of claim 4 , since the packing and the lock ring are arranged in separate grooves, the output force acts on the fluid pipe, and when the fluid pipe and the joint body move relative to each other, the lock ring becomes the end of the joint body. Even if it moves to the part side, the packing does not move and the water stopping performance is kept stable.
[0065]
According to the fifth aspect of the present invention, since the packing having an inner diameter larger than the outer diameter of the fluid pipe can be mounted in the annular groove, the friction due to the packing is caused when the fluid pipe is inserted into the joint body. Insertion resistance is eliminated, fluid pipe insertion work can be performed easily, and fluid pipe joining workability is improved.
[0066]
Further, since the pressure distribution member reduced in diameter by plastic deformation of the annular groove is disposed, it by the pressure distribution member the plastic deformation of the annular groove is reduced in diameter be heterogeneous with respect to the packing Since the packing is compressed evenly, the waterproofness of the packing is improved.
[0067]
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.
2A is a side view at the time of intermittent plastic deformation, and FIG. 2B is a side view at the time of continuous groove plastic deformation.
3A is a side view showing the lock ring, and FIG. 3B is a cross-sectional view showing the lock ring.
4A and 4B are explanatory sectional views at the time of joining, in which FIG. 4A is when the fluid pipe is inserted, FIG. 4B is when the joining is completed, and FIG. 4C is when the fluid pipe is withdrawn.
FIGS. 5A and 5B are cross-sectional views of a main part showing a second embodiment of the present invention, wherein FIG. 5A is a time when a fluid pipe is inserted, FIG. 5B is a time when joining is completed, and FIG.
FIG. 6 is a cross-sectional view of an essential part showing a third embodiment of the present invention.
FIG. 7 is a partially cutaway front view showing a conventional example.
8A is a partially cutaway front view of the lock ring, and FIG. 8B is a side view of the lock ring.
FIG. 9 is a cross-sectional view of a main part showing another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Fluid pipe 3 Joint body 3a Annular groove 3b Inner taper surface 3c Projection piece 3d Stopper 4 Lock ring 4a Outer taper surface 4b Blade 5 Packing 5a Lip part 6 Incore 6a Eave part 7 Plastic deformation part 8 Auxiliary member 8a Inner taper Surface 8b Partition piece 9 Lock ring groove 10 Packing groove 11 Pressure dispersion member

Claims (5)

流体管を水密に接合するパッキンと、流体管の外周面に食い込む刃が内周面に形成されたロックリングとを内装する環状溝が内面に形成された継手体に、合成樹脂製の流体管を挿入し、少なくともロックリングの収容された前記環状溝の所定の部分を外方から塑性変形させて、ロックリングを流体管の外周面に係止させると共に、前記パッキンが収容されている環状溝の内周面とパッキンの外周面との間に、圧力分散部材が配置され、前記環状溝を塑性変形させて前記圧力分散部材を縮径させ前記パッキンを環状溝の内周面と流体管の外周面に圧接させることを特徴とする管継手。A fluid pipe made of synthetic resin is connected to a joint body in which an annular groove is formed on the inner surface, which includes a packing for watertightly joining the fluid pipe and a lock ring having a blade that bites into the outer peripheral surface of the fluid pipe formed on the inner peripheral surface. And at least a predetermined portion of the annular groove in which the lock ring is accommodated is plastically deformed from the outside to lock the lock ring to the outer peripheral surface of the fluid pipe, and the annular groove in which the packing is accommodated. A pressure dispersion member is disposed between the inner circumferential surface of the gasket and the outer circumferential surface of the packing, and the annular groove is plastically deformed to reduce the diameter of the pressure dispersion member, and the packing is connected to the inner circumferential surface of the annular groove and the fluid pipe. A pipe joint characterized by being brought into pressure contact with an outer peripheral surface . 前記ロックリングには、継手体の端部に向かって縮径する外テーパ面が形成されるとともに、環状溝には前記外テーパ面に当接し、継手体の端部に向かって縮径する内テーパ面が形成されている請求項1に記載の管継手。  The lock ring has an outer tapered surface that decreases in diameter toward the end of the joint body, and the annular groove abuts on the outer taper surface and decreases in diameter toward the end of the joint body. The pipe joint according to claim 1, wherein a tapered surface is formed. 流体管を水密に接合するパッキンと、流体管の外周面に食い込む刃が内周面に形成されたロックリングとを内装する環状溝が内面に形成された継手体に、合成樹脂製の流体管を挿入し、少なくともロックリングの収容された前記環状溝の所定の部分を外方から塑性変形させて、ロックリングを流体管の外周面に係止させると共に、前記ロックリングには、継手体の端部に向かって縮径する外テーパ面が形成され、該外テーパ面に当接し、継手体の端部に向かって縮径する内テーパ面が形成された補助部材を環状溝の内周面とロックリングの外周面との間に配置すると共に、前記補助部材にはパッキンの継手体端部側の面に当接する区画片が内周側に突出して設けられていることを特徴とする管継手。A fluid pipe made of synthetic resin is formed on a joint body in which an annular groove is formed on the inner surface, which includes a packing for watertightly joining the fluid pipe and a lock ring having a blade that bites into the outer peripheral surface of the fluid pipe on the inner peripheral surface. And at least a predetermined portion of the annular groove in which the lock ring is accommodated is plastically deformed from the outside to lock the lock ring to the outer peripheral surface of the fluid pipe, and the lock ring includes a joint body. An outer taper surface that is reduced in diameter toward the end portion is formed, and the auxiliary member that is in contact with the outer taper surface and has an inner taper surface that is reduced in diameter toward the end portion of the joint body is provided as an inner peripheral surface of the annular groove. And the auxiliary member is provided with a partitioning piece projecting toward the inner peripheral side of the auxiliary member, which is in contact with the surface on the joint body end side of the packing. Fittings. 前記環状溝は、パッキンが収容されるパッキン溝と、ロックリングが装着されるロックリング溝とが別々に形成されている請求項1ないし3のいずれかに記載の管継手。  The pipe joint according to any one of claims 1 to 3, wherein the annular groove is formed separately with a packing groove in which a packing is accommodated and a lock ring groove in which a lock ring is mounted. 前記パッキンが収容されている環状溝の内周面とパッキンの外周面との間に、圧力分散部材が配置され、前記環状溝を塑性変形させて前記圧力分散部材を縮径させ前記パッキンを環状溝の内周面と流体管の外周面に圧接させる請求項3に記載の管継手。 A pressure dispersion member is disposed between the inner circumferential surface of the annular groove in which the packing is accommodated and the outer circumferential surface of the packing, and the annular groove is plastically deformed to reduce the diameter of the pressure dispersion member, and the packing is annular. The pipe joint according to claim 3, wherein the inner peripheral surface of the groove and the outer peripheral surface of the fluid pipe are pressed against each other.
JP29473198A 1998-08-10 1998-08-10 Pipe fitting Expired - Fee Related JP4169404B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29473198A JP4169404B2 (en) 1998-08-10 1998-08-10 Pipe fitting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29473198A JP4169404B2 (en) 1998-08-10 1998-08-10 Pipe fitting

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Publication Number Publication Date
JP2000055253A JP2000055253A (en) 2000-02-22
JP4169404B2 true JP4169404B2 (en) 2008-10-22

Family

ID=17811584

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29473198A Expired - Fee Related JP4169404B2 (en) 1998-08-10 1998-08-10 Pipe fitting

Country Status (1)

Country Link
JP (1) JP4169404B2 (en)

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