JP2004324858A - Pipe joint - Google Patents

Pipe joint Download PDF

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Publication number
JP2004324858A
JP2004324858A JP2003124154A JP2003124154A JP2004324858A JP 2004324858 A JP2004324858 A JP 2004324858A JP 2003124154 A JP2003124154 A JP 2003124154A JP 2003124154 A JP2003124154 A JP 2003124154A JP 2004324858 A JP2004324858 A JP 2004324858A
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Japan
Prior art keywords
pipe
locking ring
peripheral surface
pipe joint
locking
Prior art date
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Granted
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JP2003124154A
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Japanese (ja)
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JP4179919B2 (en
Inventor
Kenji Mizukawa
賢司 水川
Tomohiro Nakamura
知広 中村
Jun Fukuyama
潤 福山
Tomohito Inoue
智史 井上
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Sekisui Chemical Co Ltd
Inoue Sudare Co Ltd
Higashio Mech Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Inoue Sudare Co Ltd
Higashio Mech Co Ltd
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Application filed by Sekisui Chemical Co Ltd, Inoue Sudare Co Ltd, Higashio Mech Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP2003124154A priority Critical patent/JP4179919B2/en
Publication of JP2004324858A publication Critical patent/JP2004324858A/en
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  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Joints With Pressure Members (AREA)
  • Joints With Sleeves (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To enable the completion of pipe connecting work immediately after inserting a pipe into a prefabricated pipe joint without tightening a cap nut. <P>SOLUTION: A circular recessed groove 3 into which an end portion 1 of the pipe P is inserted is formed opening in an axial center outward direction A. A locking ring 12 having a locking pawl 13 is stored in a storage pocket portion 3A. The locking ring 12 is stored therein to be movable a small distance to an axial center direction L and a radial direction R. An elastic material looseness preventing ring 14 resiliently thrusts the locking ring 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、管継手に関する。
【0002】
【従来の技術】
従来、例えば、給水・給湯用のパイプを接続するための管継手としては、継手本体内へパイプの端部を挿入し、その後、袋ナットを作業工具にて締付けてゆくことで、係止リングの係止爪を、パイプの端部に食い込ませて、軸心方向に引き抜けないように接続する構造のものが知られている(例えば、特許文献1,特許文献2参照)。
【0003】
【特許文献1】
特開平10−19176号公報
【特許文献2】
特開平7−224978号公報
【0004】
【発明が解決しようとする課題】
しかしながら、このような従来の管継手では、配管現場に於て、作業者がレンチ等の作業工具をもって、管継手の上記袋ナットを回転させて締付ける作業を必要としていた。給水・給湯用の配管では多数の管継手が使用され、各々の管継手の袋ナットを、作業工具をもって締付ける上述の作業は、熟練及び時間を、要するという問題がある。さらに、狭小な空間での上記作業工具を用いての締付け作業は極めて困難な場合があり、また、高所作業の場合も難しい作業となっていた。
【0005】
そこで、本発明の第1の目的は、配管現場での作業工具の使用を不要として、単純にパイプの端部を継手に差込めば、直ちに接続作業が完了できる、作業性に優れた管継手を提供することにある。第2の目的は、パイプの端部をスムースに差込むことを実現した管継手を提供することにある。第3の目的は、一旦差込まれたパイプが所定小寸法だけ抜けると自動的に強固に引抜けを阻止し、その後は、微小なストローク分だけ、パイプの端部と継手が相対的に可動として強固に接続できる管継手を提供することにある。第4の目的は、パイプと継手との接続作業の確認を容易かつ確実に行ない得るようにすることにある。第5の目的は、被接続パイプが金属内層を有する導電性パイプである場合に、その外層のプラスチック層を破らないようにしながらも強固な引抜け阻止力を発揮する管継手を提供することにある。第6の目的は、流体の密封性に優れ、かつ、安定して長期間にわたってこの密封性を維持できるパッキンを有する管継手を提供することにある。
【0006】
【課題を解決するための手段】
上述の目的を達成するために、本発明に係る管継手は、被接続パイプの端部が差込まれる円形凹溝を軸心外方向へ開口状として有する管継手に於て、上記円形凹溝は、差込まれた上記パイプの上記端部に食い込むための係止爪を有する係止リングを軸心方向と径方向に小寸法移動可能に収容する収容ポケット部を、備え、かつ、該収容ポケット部は上記円形凹溝の外周側に形成され、しかも、上記係止リングが上記収容ポケット部内にて上記小寸法移動するのを抑制するように該係止リングを弾発的に常時押圧する弾性材質のがたつき防止リングを上記収容ポケット部内に備えている。
【0007】
また、被接続パイプの端部が差込まれる円形凹溝を軸心外方向へ開口状として有する管継手に於て、上記円形凹溝は、差込まれた上記パイプの上記端部に食い込むための係止爪を有する係止リングを軸心方向と径方向に小寸法移動可能に収容する収容ポケット部を、備え、かつ、該収容ポケット部は上記円形凹溝の外周側に形成され、しかも、上記係止リングが上記収容ポケット部内にて上記小寸法移動するのを抑制するように該係止リングを弾発的に常時押圧する弾性材質のがたつき防止リングを上記収容ポケット部内に備え、さらに、上記係止リングは上記軸心外方向へ縮径するテーパ状外周面部を有すると共に、ストレート内周面部を有し、かつ、上記収容ポケット部には上記ストレート内周面部に接触して上記係止リングの姿勢を保つための保持円筒部が設けられ、しかも、上記収容ポケット部は上記係止リングの上記テーパ状外周面部が圧縮可能なテーパ内面部を軸心外方向の端部寄りに備えている。
【0008】
また、上記係止リングが上記パイプの上記端部に食い込んだ状態で上記パイプと共に上記軸心外方向へ引抜かれて上記係止リングの上記テーパ状外周面部が上記テーパ内面部に圧接した圧接状態で、上記保持円筒部の外端に、上記係止リングの内端が近接乃至当接して上記係止リングが上記軸心方向に移動するのを規制するように構成し、上記保持円筒部の上記外端をもって軸心方向動き規制手段を形成したものである。
また、上記係止リングが上記収容ポケット部内にて上記小寸法移動するのを抑制するように上記係止リングを弾発的に常時押圧する弾性材質のがたつき防止リングを上記収容ポケット部内に備えている。
また、係止リングは、上記軸心外方向の端部に、上記パイプに食い込むための係止爪を一条のみ有する。
【0009】
また、上記パイプは、金属内層と、その内外に積層されたプラスチック内層・プラスチック外層から成り、係止リングは、上記軸心外方向の端部に、上記パイプに食い込むための係止爪を一条のみ有し、さらに、該一条の係止爪は複数の切欠部によって断続状に分断され、かつ、上記係止爪の高さ寸法は、上記プラスチック外層の厚さ寸法よりも小さく設定されている。
また、上記円形凹溝の奥部近傍を包囲形成する外壁部位を、透明として、差込まれた上記パイプの端部を、外部から目視可能としている。
さらに、上記パイプの端部の正規差込位置を示す目印として梨地帯を上記外壁部位の外周面に形成した。
【0010】
また、被接続パイプの端部が差込まれる円形凹溝を軸心外方向へ開口状として有し、かつ、該円形凹溝の内周面側を構成する挿入筒部を備えた管継手に於て、上記挿入筒部にシール溝を凹設し、さらに、横断面丸山型シール突条と、該シール突条よりも軸心外方向に配設されて該軸心外方向へ縮径するパイプ先端ガイド用勾配面を有するガイド突条とを、二山型として一体に有するパッキンを、上記シール溝に装着した。
また、上記パッキンはその自由状態で、軸心方向幅寸法が径方向厚さ寸法の 2.5倍〜4倍の偏平横断面に設定し、かつ、該パッキンの内周面に小凹溝を形成すると共に、上記シール溝の底面には、上記小凹溝に係合する係止小凸条を突設して、上記パッキンの軸心方向移動を阻止するように構成した。
【0011】
【発明の実施の形態】
以下、図示の実施の形態に基づき、本発明を詳説する。
【0012】
図1〜図7は、本発明に係る管継手の実施の一形態であって、パイプPの未接続状態(図1)から順次接続作業順に示して、さらに、接続状態とした後に流体圧力又は(温度変化に伴う)パイプ伸縮等によって接続状態が順次変化する状態を、順に示した縦断面図である。
【0013】
この管継手2及びパイプPから成る配管構造体は、例えば、冷温水が流れる給水給湯用として使用される。また、パイプPは、アルミニウム等の厚さ寸法T が約 0.2mm〜 0.5mmの金属内層6と、その内外に積層された架橋PE樹脂やポリブデン等のプラスチック内層7・プラスチック外層8から成る。
プラスチック内層7の厚さ寸法T は約 0.8mm〜 2.0mmであり、プラスチック外層8の厚さ寸法T は約 0.4mm〜 1.0mmである。このようにプラスチック内層7と金属内層6とプラスチック外層8が内から外へ順に積層され、相互に接着剤等で一体化されている。
【0014】
図1〜図7に於ては管継手2はその一部のみを示し、残部は図示省略しているが、この残部には、例えば雄ネジ部と六角頭部を有して、全体がニップル型の管継手の場合、また、この残部には、図示の一部と同じ形状・構造の部分を有するソケット型の場合、あるいは、全体がエルボ型やチーズ型の場合等、種々の形状・構造の場合がありえるが、少なくとも、その一部には、図1〜図7に示すようなパイプ接続端部構造を具備している。即ち、本発明の管継手2は、そのパイプ接続端部構造として、まず、被接続パイプPの端部1が差込まれる円形凹溝3を軸心外方向Aへ開口状として有する。具体的には、例えば、金属製継手本体4の一部分としての突出状に形成された挿入筒部5と、筒状カバー部材9と、キャップ部材10等をもって、上記パイプ接続端部構造が構成され、かつ、前記円形凹溝3が形成されている。
【0015】
図13に、この円形凹溝3の縦断面(上半分)を簡略化して示す。2点鎖線11よりも上方は、後述の収容ポケット部3Aである。つまり、この円形凹溝3は、係止リング12を、(図1〜図5で分かるように、)軸心方向Lと径方向Rに小寸法移動可能に収容する収容ポケット部3Aを、備え、この収容ポケット部3Aは円形凹溝3の外周側(かつ開口端寄り)に形成されている。
係止リング12は、差込まれたパイプPの端部1の外周面───プラスチック外層8───に食い込むための係止爪13を有する。
【0016】
しかも、図1のパイプ未挿入状態(挿入前の状態)で、係止リング12が収容ポケット部3A内にて、軸心方向Lと径方向Rに小寸法移動すること───がたつくこと───を抑制するように、がたつき防止リング14を収容ポケット部3A内に内装する。このがたつき防止リング14は、横断面長方形の全体円環状であり、ゴム又は(軟質)プラスチック等の弾性材質のものを使用し、収容ポケット部3Aの局部的にやや大径となっている部位の内面に、がたつき防止リング14を密に嵌合させ、係止リング12の外周面に圧接させて、係止リング12を弾発的に常時、径方向Rの内方、かつ、軸心方向Lの内方(図1の左方)へ、押圧する。係止リング12は青銅等から成り、弾発力の弱い材質とする。
【0017】
さらに詳しく説明すると、上記係止リング12は、図9と図10(B)及び図1〜図7に示すように、軸心外方向Aへ縮径するテーパ状外周面部15を有する外方半体部16と、ストレート内周面部18を有する内方半体部(スカート部)17と、から成る。かつ、図9のように円周一箇所に切断部19を有して、全体は、自由状態ではC型で、使用状態(例えば図11の状態)では略円環状となるように上記切断部19は十分小さくなる。
【0018】
係止リング12の外方半体部16は、内周面20が軸心と平行なストレート状であって、段差部21を介して、この内周面20よりも僅かに大径のストレート内周面部18に、連続する。また、係止リング12(外方半体部16)の軸心外方向Aの端部に、パイプPに食い込むための係止爪13を一条のみ有する。つまり、(従来のように)複数条形成することなく、一条のみの係止爪13として、集中的に一条のこの係止爪13をパイプPの外周面に強力に食い込ませる構造とした。この係止爪13の横断面形状は、軸心方向Lの内方へ傾斜した小三角形乃至鈎形である。また、外方半体部16の横断面形状は7°≦θ ≦20°の角度を外方先端に有する略三角形状である。
【0019】
さらに、この一条の係止爪13は複数の切欠部22…によって断続状に分断され、かつ、この係止爪13の高さ寸法H13───内周面20を基準として計測した高さ寸法───は、図11に示す如く、パイプPのプラスチック外層8の厚さ寸法T よりも小さく設定され、図11のように最も食い込んだ状態においても、厚さ寸法T の残肉が、係止爪13の最先端縁部と、金属内層6との間に、存在するように構成される。しかも、係止爪13が上記切欠部22を有することで、図11のように係止爪13が最も食い込んだ状態で、プラスチック外層8は軸心方向Lに連結する複数本の小連結リブが形成され、これによって、図12の説明図に示す如くプラスチック外層8の端部8aが、スッポリと短筒状に引き抜けることを防止している。例えば、温度が80℃以上の湯(水)がパイプP内を流れると、プラスチック外層8の内面と、金属内層6の外面の間の接着剤が軟化し、図12に示すように、端部8aが短筒状に引き抜ける虞れがあるが、本発明では、H13<T なる関係を満たすことで、厚さ寸法T の薄肉円筒層を残し、かつ、複数の(多数の)切欠部22によって、連結リブがプラスチック外層8に形成され、図12に示したような上記引き抜けを、有効に防止している。しかも、図11のように、厚さ寸法T の残肉層が、最も食い込んだ係止爪13の最先端部と、金属内層6との間に、形成されることにより、金属内層6と係止爪13の間に電気が流れる状態を防ぎ、これによって、電蝕を防止する。
【0020】
内方半体部(スカート部)17は、ストレート外周面部24を有し、前記ストレート内周面部18と共に、薄肉円筒状であり、内周面部18は前記段差部21を介して、外方半体部16の内周面20に連続し、他方、外周面部24は、段差部25を介して、外方半体部16のテーパ状外周面部15に連続する。
【0021】
次に、収容ポケット部3Aの内部に於て、図1〜図5の各状態で、係止リング12の上記ストレート内周面部18に接触して、係止リング12の姿勢───特に軸心に直交する平面上に係止リング12が位置するような正常な姿勢───を保持円筒部23が、設けられている(図13では判り易いようにこの保持円筒部23を斜線にて図示した)。
【0022】
さらに、収容ポケット部3Aは、係止リング12のテーパ状外周面部15が圧接可能なテーパ内面部26を、軸心外方向Aの端部寄りに備えている。テーパ内面部26の傾斜角度θ (図10参照)は、7°〜20°に設定し、前記係止爪13の角度θ に略等しく設定するが、望ましくは、僅かに( 0.5°〜 1.5°)大に設定する。つまり、
0.5°≦(θ −θ )≦ 1.5°
のように設定することで、一条の先端(外端)の係止爪13が、テーパ内面部26にて絞られて、確実にパイプPの外周面に食い込むこととなる。図例では、このテーパ内面部26は、(金属製の)キャップ部材10に形成されている。
【0023】
次に、図1,図2,図3,図4,図5と順次パイプPが管継手2の円形凹溝3内へ挿入されて(差し込まれて)、接続作業が完了した(図5に示した)接続状態に於て、流体圧力が作用し、又は、温度変化によってパイプPが熱膨張で伸縮し、若しくは外力がパイプP等に作用した場合、図5から図6に示すように、パイプPが軸心外方向Aに引き抜かれようとする。その際、係止リング12の係止爪13は、パイプPの端部1の外周面に食い込み、パイプPと共に係止リング12は軸心外方向Aへ小寸法だけ移動し、保持円筒部23の外周面に外嵌状に保持されていた係止リング12の内方半体部17は、図6及び図11に示す如く、保持円筒部23から離脱し、がたつき防止リング14及びテーパ内面部26による径方向Rの内方への力を受けて僅かに縮径し、係止リング12の内端27が、保持円筒部23の外端23aに、近接乃至当接する。即ち、本発明に係る管継手は、図6と図7と図11の状態に於て、係止リング12が軸心方向Lに移動するのを規制する軸心方向動き規制手段Gを具備し、この軸心方向動き規制手段Gは、上述した保持円筒部23の外端23aをもって構成される。
【0024】
言い換えると、図1の状態(又は図2〜図5の状態)に於て、係止リング12は軸心方向Lに小寸法移動可能であるが、その後、上記係止リング12がパイプPの上記端部1に食い込んだ状態で上記パイプPと共に上記軸心外方向Aへ引抜かれて上記係止リング12の上記テーパ状外周面部15が上記テーパ内面部26に圧接した圧接状態で、上記保持円筒部23の外端23aに、上記係止リング12の内端27が近接乃至当接して上記係止リング12が上記軸心方向Lに移動するのを規制するように構成し、上記保持円筒部23の上記外端23aをもって軸心方向動き規制手段Gを形成している。
【0025】
次に、円形凹溝3の内周面側を構成する挿入筒部5に、シール溝28を凹設し、このシール溝28にゴム等の弾性材のパッキン29を装着し、円形凹溝3へ差し込まれてくるパイプPの内周面に、このパッキン29を密に圧接して、流体を密封する。図14に示すように、パッキン29はその自由状態(未装着状態)で、軸心方向幅寸法Wが径方向厚さ寸法T29の 2.5倍〜4倍の偏平(細長)横断面形状に設定する。
【0026】
そして、シール溝28の横断面形状も偏平(細長)横断面形状として、このシール溝28に、弾性的に拡径しつつパッキン29を外嵌して装着する。パッキン29の内周面29aには、(軸心方向Lの略中央近傍に)小凹溝30を形成し、他方、シール溝28の底面(径方向底面)28aには、この小凹溝30に係合する係止小凸条31を突設して、パッキン29の軸心方向移動を阻止するように構成されている。
【0027】
さらに、このパッキン29は、横断面丸山型シール突条32を軸心方向Lの内方寄り又は中央近傍に配設し、かつ、このシール突条32よりも軸心外方向Aにガイド突条33を有し、上記シール突条32とガイド突条33にて二山型に形成される。
図例では、ガイド突条33は軸心外方向Aへ縮径するパイプ先端ガイド用勾配面34を有し、略三角山型であると共に、軸心外方向Aの端部に配設されている。
【0028】
上述のように、 2.5×T29≦W≦ 4.0×T29に設定した理由は、W< 2.5×T29の場合には、シール突条32とガイド突条33の2条を配置することが難しくなり、かつ、パイプPを差込時に、パッキン29が捩れて、横断面に於て正常姿勢を維持することが困難となる。逆に、 4.0×T29<Wの場合、不必要に幅寸法Wが過大となり、シール溝28の切削加工の工数も掛かり、円形凹溝3も余分に深くせねばならない。
【0029】
次に、円形凹溝3の中間及び奥部近傍にわたって包囲形成する外壁部位35───具体的には前記筒状カバー部材9───を、透明の合成樹脂として、差込まれたパイプPの端部1を、外部から目視可能とする。なお、外壁部位35を「透明」とするとは、無色透明及び(有色の)半透明を含むものと定義する。さらに、(後述の)図5に於て、パイプPの端部1の正規差込位置を示す目印として、上記筒状カバー部材9等の外壁部位35の外周面に梨地帯36を形成する(図8参照)。この梨地帯36は、例えば、プラスチックの射出成型金型のキャビティの内面に、微細な凹凸模様を施して、射出成型時に形成できる。
【0030】
ところで、上述の構成につき、図1〜図11に於て、具体的な部品等と共にさらに詳しく説明する。金属製継手本体4は青銅等の金属製で挿入筒部5を有し、この挿入筒部5の先端外周面はアール状37として、パイプPの孔部38に挿入し易い。そして、この挿入筒部5の中間にシール溝28が凹設され、例えば、シール溝28の深さ寸法は、底壁肉厚寸法T28の80%〜 100%の値に設定し、シール溝28の形状を偏平状(細長)矩形とすると共に、底壁部39の強度を最小限有し、かつ、挿入筒部5の孔部5aを可能な限り大きくして流体の通過抵抗を小さくする構成である。挿入筒部5の基端寄りに雄ネジ部40を形成し、その雄ネジ部40の先端側に段付部41を形成し、この段付部41が、円形凹溝3の軸心方向Lの奥面を形成する。挿入筒部5の基端は段付部42をもって終り、この段付部42は、六角頭部やエルボ中間部やティー中間部等の継手中間膨出部の一部分である。
【0031】
筒状カバー部材9は、透明な合成樹脂から成り、基端内周面に雌ネジ部43を有し、上記雄ネジ部40と着脱自在に螺着される。段付部42にこの筒状カバー部材9の基端面が圧接状として、上記螺着の状態となる。雌ネジ部43の終わる先端側の段付部44が、前記段付部41と対応する軸心方向Lの位置として、円形凹溝3の奥面を形成する。この段付部44から、平滑なパイプ挿入孔面部45が形成され、筒状カバー部材9の孔部の大半を占めている。
【0032】
保持円筒部23の内周面は、上記パイプ挿入孔面部45と、(同一内径寸法として)連続面状に続いている。さらに、この保持円筒部23の外周面側に、小ポケット部46が、軸心外方向Aへ開口状に形成されていて、この小ポケット部46内へ係止リング12の内方半体部(スカート部)17が収納可能である(図1〜図5参照)。小段差47を介して、がたつき防止リング14が摺動可能に嵌着される開口孔部48が形成される。筒状カバー部材9の外周面には、その軸心方向Lの中間に大径部49が形成され、段付部50を介して雄ネジ部51が形成されている。
【0033】
キャップ部材10は、青銅等の金属製であり、図8に示す如く、外周面は(六角や二面取りとしないで)円形として、一旦管継手として組立てた状態のままで、(現場ではスパナ等の作業工具にて回転させずに、)パイプPを差込めば組立作業が可能であることを、表している。
このキャップ部材10は、先端面52からアール部53を介してテーパ内面部26に連続的に孔部が形成される。テーパ内面部26は、軸心外方向Aへ次第に縮径状である。段付部54を介して大径孔部を形成して、この大径孔部には、雌ネジ部55が形成され、この雌ネジ部55を、上記雄ネジ部51に螺着して、キャップ部材10を筒状カバー部材9に取付ける。その際、図1に示すように、係止リング12、がたつき防止リング14を予め組付けた後に、キャップ部材10を筒状カバー部材9に固着(螺着)する。
【0034】
このように、係止リング12を軸心方向Lと径方向Rに小寸法移動可能に収容する収容ポケット部3Aは、筒状カバー部材9とキャップ部材10にて形成される。なお、所望により、具体的な構成部品の個数を増減したり、形状を変更したり、部品の分割位置を変更する等を行うことは自由である。
【0035】
次に、配管接続作業及び作動(作用)について説明する。
まず、図1の左半分に示すように、本願発明の管継手は工場等で予め組立てられた状態にある。即ち、パッキン29はシール溝28に嵌着され、好ましくは接着剤にて位置ずれ防止を図っておく。そして、係止リング12とがたつき防止リング14は図1のように収容ポケット部3Aに収納しておく。つまり、係止リング12の内方半体部(スカート部)17を、保持円筒部23の外周面に外嵌状として保持し、かつ、ゴム等の弾性材から成るがたつき防止リング14は、開口孔部48に嵌着され、係止リング12を内径方向に、かつ、軸心方向Lの内方へも、弾性的に常時押圧して、係止リング12が収容ポケット部3A内で小寸法移動する(がたつく)ことを有効に抑制し、しかも、係止リング12の係止爪13が、管継手軸心56に対して、偏心しないように、かつ、軸心56に対する直交平面上に係止爪13が存在するように(倒れないように)、保持している。
【0036】
この状態の管継手2に対し、パイプPの端部1を、円形凹溝3内へ挿入(差込)すると、図2に示すように、まず、係止リング12の係止爪13に軽く接触しながら、かつ、挿入筒部5の外周面に摺接しながら、円形凹溝3に内方(奥方)へ進み、パッキン29の勾配面34にてパイプPの先端内周縁部をガイドしつつ、パッキン29は、図3のように圧縮弾性変形し、さらに、パイプPが挿入されると、パッキン29のシール突条32を圧縮弾性変形して、図4の状態となる。図1では、シール溝28とパッキン29の軸心方向Lの両端に存在した空隙部57,57は、図4の状態では無くなる(又は僅少となる)。
【0037】
さらに、パイプPを挿入(差込)してゆくと、図5に示すように、円形凹溝3の奥面に、パイプPの最先端面58が当接する(突き当たる)。透明な筒状カバー部材9を通して、このようにパイプPの最先端面58がどの位置まで挿入されたか、目視できる。特に、梨地帯36にて、図5のように、最先端面58が十分に挿入されたかを容易に確認可能である。このとき、係止リング12の係止爪13は、パイプPの外周面には十分に食い込んではいない。
【0038】
その後、図5から図6・図11に示すように、流体圧(水圧)を受けたり、温度の変動により、軸心外方向AへパイプPの端部1が僅かに移動する(引抜かれる)と、係止リング12はパイプPの端部1と共に引きづられ、内方半体部(スカート部)17が保持円筒部23から外れて(離脱して)、しかも、テーパ状外周面部15がテーパ内面部26に圧接して、係止リング12は内径方向へ強く押圧され、係止爪13は、パイプPのプラスチック外層8に食い込み、引き抜きが阻止される(図11参照)。梨地帯36は、このときのパイプPの最先端面58の位置を確認するのに好適な対応する位置に配置しておく。
【0039】
その後、パイプPが熱膨張したり、外力が作用すると、図6から図7に示すように、パイプPの端部1が、円形凹溝3の奥方へ押込まれ(挿入され)、円形凹溝3の奥面に最先端面58が当接した状態となる。ところで、図6と図11に示した状態では、既に、保持円筒部23の外端23aに、係止リング12の内端27が近接乃至当接して、係止リング12が軸心方向Lに移動することが規制されている───軸心方向動き規制手段Gの作用にて規制されている。従って、図6から図7に変化する際にも、係止リング12は軸心方向Lへは移動せず、パイプPのみが奥方へ挿入されて(差込まれて)ゆく。
【0040】
その後、流体圧力の変動、温度の昇降変動、外力の作用等が発生した場合、図7の状態では強力に係止爪13がパイプPの外周面に食い込んでいるため、(上述の図5から図6のようには)パイプPは容易に引き抜けず、強力に接続保持される───本発明では、拘束保持状態という。
【0041】
係止リング12の三角山型の係止爪13の高さ寸法H13は、パイプPのプラスチック外層8の厚さ寸法T よりも小さく設定され、かつ、複数の切欠部22によって係止爪13は断続状であるので、図12に示したような問題が有効に防止できる。つまり、プラスチック外層8の所定長さの端部8aが、金属内層6から、すぽっとずり抜ける問題を防止できる。言い換えると、切欠部22の存在によって、プラスチック外層8が完全に輪切りされることがなく、切欠部22にてプラスチックのリブとして連結状を保つので、端部8aが分離することがないのである。なお、図9に於て、切断部19は、図6,図7,図11の状態では、僅小乃至接触するように、閉じて、係止リング12は略全閉ループ状(環状)を呈している。
なお、パイプPとしては、外周面が少なくともプラスチックであれば十分であり、金属層と外層プラスチックの二層のものや、プラスチックのみから成るものであっても、自由である。
【0042】
【発明の効果】
本発明は上述の構成により、次のような著大な効果を奏する。
【0043】
(請求項1,2,3によれば、)従来の袋ナットの締付け作業が不要であり、単に、パイプPを円形凹溝3へ挿入すれば、直ちにパイプ接続作業は完了する。そして、がたつき防止リング14によって、係止リング12が収容ポケット部3A内で正常な位置でかつ正しい姿勢に保持され、軸心56に対して真円状態にあり、かつ、軸心56と直交する平面上に位置していて、パイプPの端部1の挿入時に、係止リング12の円周の一部分に衝突して、挿入が難しくなるといった問題を防ぎ、極めてスムースに挿入が可能であり、しかも、挿入した後に、僅かに引抜けようとすると、直ちに係止リング12の係止爪13がパイプPの外周面に食い込んで、その引抜けを阻止できる。
【0044】
(請求項2,3によれば、)係止リング12のストレート内周面部18が保持円筒部23によって正常な姿勢・寸法に保持されているので、パイプPを一層スムースに挿入可能となる。しかも、最も深く、円形凹溝3の奥面(奥部)までパイプPを一旦挿入した後に、パイプPが引抜ける方向に僅かに動けば、係止リング12のテーパ状外周面部15が、テーパ内面部26に圧接しつつ絞られて、強力に係止爪13がパイプPの外周面に食い込んで、引抜けを直ちに阻止できる。
【0045】
(請求項3によれば、)軸心方向動き規制手段Gは簡単な保持円筒部23の外端23aをもって構成したので、コンパクトでかつ作動もスムースである。しかも、この軸心方向動き規制手段Gによって、接続直後は小寸法だけはパイプPが移動可能(図5と図6参照)であったものが、その後は、軸心方向Lにほとんど動かないように強固にパイプPを掴持(係止)できる(図7参照)。つまり、ストローク可能代(寸法)が、その後の流体圧力変動や熱膨張や外力によってパイプPが小寸法移動すれば、自動的に減少して、強固にパイプPに対する管継手2の移動を阻止することができる。従って、本発明の管継手は、パイプ接続作業が容易であると共に強力な接続状態(拘束接続状態)を自動的に行ない得る。
【0046】
(請求項4によれば、)がたつき防止リング14を収容ポケット部3A内に備えているので、パイプPの挿入前の状態下で、係止リング12が正常な姿勢で、かつ正常な寸法・位置を維持し、パイプPの端部1を、(係止リング12に円周上で部分的に衝突せずに)スムースに挿入作業を行ない得る。
【0047】
(請求項5,6によれば、)係止爪13を一条(単数体)のみとしたことで、食い込み面圧力が高まり、確実にパイプPの外周面に、強力に食い込む。これによって、引抜阻止力は極めて大とすることができる。
(請求項6によれば、)図12にて既に説明したように、プラスチック外層8が輪切りされて端部8aが引抜けることを防止できる。しかも、電蝕を防止できる。
【0048】
(請求項7,8によれば、)パイプPの挿入された端部1を外部から目視して、円形凹溝3の正規の深さまで挿入されたか(差込まれたか)否かを容易に確認して、接続作業完了時の確認・検査が容易となる。
(請求項8によれば、)梨地帯36は加工が容易であり、また、所定の幅寸法を有するのでパイプPの最先端面58の複数の正規位置を表示することもできる。
【0049】
(請求項9によれば、)パッキン29は、丸山型シール突条32とガイド突条33とを二山型に一体に有するので、パイプPの挿入時に捩れることもなく、正常な姿勢を保持できる。しかも、パイプ先端ガイド用勾配面34を有するガイド突条33によって、スムースにパイプ先端を、誘導しつつ、パッキン29自体は圧縮弾性変形する。挿入後は、丸山型シール突条32によって、高い密封性(シール性)を発揮する。
【0050】
(請求項10によれば、)2.5 ×T29≦W≦ 4.0×T29として偏平横断面としたことで、浅いシール溝28で済み、挿入筒部5を肉薄として、挿入筒部5の孔部5aの流路断面を大きく確保できる。しかも、パッキン29は捩れにくくなって、安定姿勢をシール溝28内にて維持できる。しかも、係止小凸条31と小凹溝30の係止によって、軸心方向Lへパッキン29が位置ずれすることを防止して、安定したシール性(密封性)を確保できる。
【図面の簡単な説明】
【図1】本発明の実施の一形態を示す未接続状態の断面説明図である。
【図2】パイプを挿入しつつある第1段階を示す断面図である。
【図3】パイプを挿入しつつある第2段階を示す断面図である。
【図4】パイプを挿入しつつある第3段階を示す断面図である。
【図5】パイプ挿入完了状態の断面図である。
【図6】小寸法だけパイプが引き抜かれた状態を示す断面図である。
【図7】再びパイプが奥方へ押込まれた状態を示す断面図である。
【図8】透明な筒状カバー部材を主として説明する外観正面図である。
【図9】係止リングの説明図であって、(A)は斜視説明図、(B)は正面説明図である。
【図10】要部の部品の断面説明図である。
【図11】要部拡大作用説明断面図である。
【図12】不具合を説明する斜視図である。
【図13】円形凹溝の概略説明図である。
【図14】パッキンの断面図である。
【符号の説明】
1 端部
2 管継手
3 円形凹溝
3A 収容ポケット部
5 挿入筒部
6 金属内層
7 プラスチック内層
8 プラスチック外層
9 筒状カバー部材
10 キャップ部材
12 係止リング
13 係止爪
14 がたつき防止リング
15 テーパ状外周面部
18 ストレート内周面部
22 切欠部
23 保持円筒部
23a 外端
26 テーパ内面部
27 内端
28 シール溝
28a 底面
29 パッキン
29a 内周面
30 小凹溝
31 係止小凸条
32 シール突条
33 ガイド突条
34 勾配面
35 外壁部位
36 梨地帯
A 軸心外方向
G 軸心方向動き規制手段
L 軸心方向
P パイプ
R 径方向
厚さ寸法
厚さ寸法
29 厚さ寸法
W 幅寸法
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe joint.
[0002]
[Prior art]
Conventionally, for example, as a pipe joint for connecting a pipe for water supply / hot water supply, an end of the pipe is inserted into a joint body, and then a cap nut is tightened with a work tool, so that a locking ring is used. (See, for example, Patent Literature 1 and Patent Literature 2) in which a locking claw is cut into an end of a pipe and connected so as not to be pulled out in an axial direction.
[0003]
[Patent Document 1]
JP-A-10-19176
[Patent Document 2]
JP-A-7-224978
[0004]
[Problems to be solved by the invention]
However, in such a conventional pipe joint, at a piping site, an operator needs to rotate the cap nut of the pipe joint with a working tool such as a wrench to tighten the nut. A large number of pipe joints are used in water supply / hot water supply pipes, and the above-described operation of tightening the cap nuts of each pipe joint with a work tool requires skill and time. Furthermore, fastening work using the above-mentioned work tool in a small space may be extremely difficult, and work in high places is also difficult.
[0005]
Therefore, a first object of the present invention is to provide a pipe joint excellent in workability, in which connection work can be completed immediately by simply inserting an end of a pipe into a joint without using a work tool at a piping site. Is to provide. A second object is to provide a pipe joint that realizes a smooth insertion of an end of a pipe. A third object is that once the inserted pipe comes out of a predetermined small dimension, the pipe is automatically and firmly prevented from being pulled out, and thereafter, the pipe end and the joint are relatively movable by a minute stroke. It is an object of the present invention to provide a pipe joint which can be connected firmly. A fourth object is to make it possible to easily and surely check the connection work between the pipe and the joint. A fifth object is to provide a pipe joint which, when the pipe to be connected is a conductive pipe having a metal inner layer, exhibits a strong pull-out preventing force while not breaking the plastic layer of the outer layer. is there. A sixth object is to provide a pipe joint having a gasket which is excellent in sealing performance of a fluid and can maintain the sealing performance stably for a long period of time.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a pipe joint according to the present invention is characterized in that in a pipe joint having a circular concave groove into which an end of a connected pipe is inserted as an opening outside the axial center, the circular concave groove Comprises a receiving pocket portion for receiving a locking ring having a locking claw for biting into the inserted end of the pipe so as to be movable in a small dimension in the axial direction and in the radial direction, and A pocket portion is formed on the outer peripheral side of the circular concave groove, and furthermore, the locking ring is constantly and elastically pressed so as to prevent the locking ring from moving in the small size within the receiving pocket portion. An anti-rattle ring made of an elastic material is provided in the storage pocket portion.
[0007]
Further, in a pipe joint having a circular concave groove into which the end of the connected pipe is inserted as an opening outside the axial center, the circular concave groove cuts into the end of the inserted pipe. A housing pocket for accommodating a locking ring having a locking claw of a small dimension in the axial direction and the radial direction, and the housing pocket is formed on the outer peripheral side of the circular groove, and An anti-rattle ring made of an elastic material which elastically presses the locking ring resiliently at all times so as to suppress the locking ring from moving in the storage pocket in the small dimension is provided in the storage pocket. Further, the locking ring has a tapered outer peripheral surface portion whose diameter is reduced in the outer direction of the axis, has a straight inner peripheral surface portion, and contacts the accommodation pocket portion with the straight inner peripheral surface portion. Hold the posture of the locking ring Cylindrical holding portion is provided for, moreover, the receiving pocket portion the tapered outer peripheral surface of the locking ring is provided with a tapered inner surface portion compressible towards the end portions of the axial epicardial direction.
[0008]
Also, a pressure-contact state in which the locking ring is pulled out of the axial center together with the pipe in a state where the locking ring bites into the end of the pipe and the tapered outer peripheral surface of the locking ring is pressed against the tapered inner surface. An inner end of the locking ring approaches or contacts the outer end of the holding cylindrical portion to restrict the locking ring from moving in the axial direction. The outer end forms an axial movement restricting means.
In addition, an anti-rattle ring made of an elastic material which constantly and elastically presses the locking ring so as to suppress the locking ring from moving in the storage pocket portion in the small dimension is provided in the storage pocket portion. Have.
In addition, the locking ring has only one locking claw at the end outside the axis to cut into the pipe.
[0009]
Further, the pipe comprises a metal inner layer and a plastic inner layer and a plastic outer layer laminated inside and outside thereof, and the locking ring has a locking claw for cutting into the pipe at one end of the shaft outer direction. Further, the single locking claw is intermittently divided by a plurality of notches, and the height of the locking claw is set to be smaller than the thickness of the plastic outer layer. .
In addition, the outer wall portion surrounding and surrounding the inner portion of the circular groove is transparent, and the inserted end of the pipe is visible from the outside.
Further, a pear belt was formed on the outer peripheral surface of the outer wall portion as a mark indicating a normal insertion position at the end of the pipe.
[0010]
In addition, a pipe joint having a circular concave groove into which the end of the connected pipe is inserted as an opening outside the axial center, and having an insertion tube portion forming an inner peripheral surface side of the circular concave groove. In this case, a seal groove is formed in the insertion cylindrical portion, and furthermore, a seal ridge having a round cross section in a cross section, and the seal ridge is disposed in a direction outside the axis relative to the seal ridge to reduce the diameter in the direction outside the axis. A gasket integrally including a guide ridge having a sloped surface for guiding the pipe tip as a double crest was mounted in the seal groove.
In the free state of the packing, the width in the axial direction is set to a flat cross section of 2.5 to 4 times the thickness in the radial direction, and a small groove is formed on the inner peripheral surface of the packing. At the same time, a small locking ridge that engages with the small groove is projected from the bottom surface of the seal groove so as to prevent the packing from moving in the axial direction.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
[0012]
1 to 7 show an embodiment of the pipe joint according to the present invention, in which the pipes P are sequentially shown in an unconnected state (FIG. 1) in the order of connection work, and further, after the pipes P are connected, a fluid pressure or It is the longitudinal cross-sectional view which showed the state in which the connection state changes sequentially by pipe expansion / contraction etc. (according to temperature change).
[0013]
The pipe structure including the pipe joint 2 and the pipe P is used, for example, for hot and cold water supply through which cold and hot water flows. The pipe P has a thickness T of aluminum or the like. 6 Consists of a metal inner layer 6 having a thickness of about 0.2 mm to 0.5 mm, and a plastic inner layer 7 and a plastic outer layer 8 which are laminated inside and outside thereof, such as crosslinked PE resin or polybutene.
Thickness T of plastic inner layer 7 7 Is about 0.8 mm to 2.0 mm, and the thickness dimension T of the plastic outer layer 8 is 8 Is about 0.4 mm to 1.0 mm. As described above, the plastic inner layer 7, the metal inner layer 6, and the plastic outer layer 8 are sequentially laminated from inside to outside, and are integrated with each other by an adhesive or the like.
[0014]
1 to 7, only a part of the pipe joint 2 is shown and the remaining part is not shown, but the remaining part has, for example, a male screw part and a hexagonal head, and the whole is a nipple. In the case of a type of pipe joint, and the remaining part, there are various shapes and structures such as a socket type having the same shape and structure as the part shown in the figure, or an elbow type and a cheese type as a whole. However, at least a part thereof has a pipe connection end structure as shown in FIGS. That is, the pipe joint 2 of the present invention has, as a pipe connection end structure, first, a circular groove 3 into which the end 1 of the pipe to be connected P is inserted in an opening A in a direction A outside the axial center. Specifically, for example, the pipe connection end structure is constituted by a protruding insertion cylindrical portion 5 as a part of the metal joint main body 4, a cylindrical cover member 9, a cap member 10, and the like. In addition, the circular groove 3 is formed.
[0015]
FIG. 13 shows a simplified vertical cross section (upper half) of the circular groove 3. Above the two-dot chain line 11 is a storage pocket 3A described later. That is, the circular concave groove 3 includes an accommodation pocket portion 3A that accommodates the locking ring 12 so as to be movable in a small dimension in the axial direction L and the radial direction R (as can be seen in FIGS. 1 to 5). The accommodation pocket 3A is formed on the outer peripheral side of the circular groove 3 (and near the opening end).
The locking ring 12 has a locking claw 13 for cutting into the outer peripheral surface {plastic outer layer 8} of the end 1 of the inserted pipe P.
[0016]
Moreover, the locking ring 12 moves a small dimension in the axial direction L and the radial direction R in the accommodation pocket portion 3A in a state where the pipe is not inserted in FIG. 1 (a state before insertion). The rattling prevention ring 14 is provided inside the storage pocket portion 3A so as to suppress ──. The rattling preventing ring 14 has an overall annular shape with a rectangular cross section, is made of an elastic material such as rubber or (soft) plastic, and has a slightly larger diameter locally in the storage pocket 3A. The rattling prevention ring 14 is closely fitted to the inner surface of the part, and is pressed against the outer peripheral surface of the locking ring 12 so that the locking ring 12 is elastically and always constantly inward in the radial direction R, and It is pressed inward in the axial direction L (leftward in FIG. 1). The locking ring 12 is made of bronze or the like, and is made of a material having low elasticity.
[0017]
More specifically, as shown in FIGS. 9 and 10B and FIGS. 1 to 7, the locking ring 12 has an outer half having a tapered outer peripheral surface portion 15 whose diameter decreases in a direction A outside the axial center. It comprises a body portion 16 and an inner half portion (skirt portion) 17 having a straight inner peripheral surface portion 18. Further, as shown in FIG. 9, a cutting portion 19 is provided at one location on the circumference, and the whole is C-shaped in a free state and substantially annular in a used state (for example, the state of FIG. 11). Becomes sufficiently small.
[0018]
The outer half portion 16 of the locking ring 12 has a straight shape in which the inner peripheral surface 20 is parallel to the axis, and a straight portion slightly larger in diameter than the inner peripheral surface 20 via the step portion 21. It is continuous with the peripheral surface portion 18. Further, at the end of the locking ring 12 (outer half portion 16) in the direction A outside the axial center, there is provided only one locking claw 13 for biting into the pipe P. That is, a structure in which only one locking claw 13 is intensively bitten into the outer peripheral surface of the pipe P as a single locking claw 13 is formed without forming a plurality of locking claw (as in the related art). The cross-sectional shape of the locking claw 13 is a small triangle or a hook that is inclined inward in the axial direction L. The cross-sectional shape of the outer half part 16 is 7 ° ≦ θ. 1 It is a substantially triangular shape having an angle of ≦ 20 ° at the outer tip.
[0019]
Further, the single locking claw 13 is divided into a plurality of notches 22 in an intermittent manner, and the height H of the locking claw 13 is increased. Thirteen {Height dimension measured on the basis of the inner peripheral surface 20} is the thickness dimension T of the plastic outer layer 8 of the pipe P as shown in FIG. 8 Is set to be smaller than the thickness T. 0 Is formed between the leading edge of the locking claw 13 and the metal inner layer 6. Moreover, since the locking claw 13 has the notch 22, the plastic outer layer 8 has a plurality of small connecting ribs connected in the axial center direction L in a state where the locking claw 13 is most bite as shown in FIG. As a result, the end 8a of the plastic outer layer 8 is prevented from being pulled out in a short tubular shape with the plastic as shown in the explanatory view of FIG. For example, when hot water (water) having a temperature of 80 ° C. or more flows through the pipe P, the adhesive between the inner surface of the plastic outer layer 8 and the outer surface of the metal inner layer 6 softens, and as shown in FIG. 8a may be pulled out into a short cylindrical shape, but in the present invention, H Thirteen <T 8 By satisfying the following relationship, the thickness T 0 In addition, the connecting ribs are formed in the plastic outer layer 8 by a plurality of (a large number of) cutouts 22 to effectively prevent the pull-out as shown in FIG. Moreover, as shown in FIG. 0 Is formed between the innermost layer of the metal cladding 13 and the leading edge of the locking claw 13 that has been cut most, thereby preventing a state in which electricity flows between the metal inner layer 6 and the locking claw 13. This prevents electrolytic corrosion.
[0020]
The inner half portion (skirt portion) 17 has a straight outer peripheral surface portion 24 and is a thin cylindrical shape together with the straight inner peripheral surface portion 18. The outer peripheral surface portion 24 is continuous with the tapered outer peripheral surface portion 15 of the outer half body portion 16 via the step portion 25 through the inner peripheral surface 20 of the body portion 16.
[0021]
Next, in each of the states shown in FIGS. 1 to 5, the inside of the storage pocket portion 3 </ b> A comes into contact with the straight inner peripheral surface portion 18 of the locking ring 12, and the posture of the locking ring 12, particularly the shaft The holding cylinder 23 is provided with a normal posture よ う な such that the locking ring 12 is positioned on a plane perpendicular to the heart (for easy understanding in FIG. 13, the holding cylinder 23 is indicated by oblique lines). Illustrated).
[0022]
Further, the accommodation pocket portion 3A includes a tapered inner surface portion 26 to which the tapered outer peripheral surface portion 15 of the locking ring 12 can press against, near the end in the axial direction A. Angle of inclination θ of tapered inner surface 26 2 (See FIG. 10) is set to 7 ° to 20 °, and the angle θ of the locking claw 13 is set. 1 , But desirably is set slightly (0.5 ° to 1.5 °) larger. That is,
0.5 ° ≦ (θ 2 −θ 1 ) ≦ 1.5 °
By setting as described above, the locking claw 13 at one end (outer end) is squeezed by the tapered inner surface portion 26 and surely bites into the outer peripheral surface of the pipe P. In the illustrated example, the tapered inner surface portion 26 is formed on the (metal) cap member 10.
[0023]
Next, the pipe P is sequentially inserted (inserted) into the circular groove 3 of the pipe joint 2 in the order of FIG. 1, FIG. 2, FIG. 3, FIG. In the connected state, when fluid pressure acts, or when the pipe P expands and contracts due to thermal expansion due to a temperature change, or when an external force acts on the pipe P or the like, as shown in FIGS. The pipe P is about to be pulled out in the axial direction A. At this time, the locking claw 13 of the locking ring 12 bites into the outer peripheral surface of the end 1 of the pipe P, and the locking ring 12 moves with the pipe P by a small dimension in the direction A outside the axis, and the holding cylindrical portion 23 6 and 11, the inner half portion 17 of the locking ring 12, which has been externally held on the outer peripheral surface of the locking ring 12, is separated from the holding cylindrical portion 23, and the rattling prevention ring 14 and the taper The diameter is slightly reduced due to the inward force in the radial direction R by the inner surface portion 26, and the inner end 27 of the locking ring 12 approaches or comes into contact with the outer end 23 a of the holding cylindrical portion 23. That is, the pipe joint according to the present invention is provided with the axial direction movement restricting means G for restricting the movement of the locking ring 12 in the axial direction L in the state of FIGS. 6, 7 and 11. The axial movement restricting means G includes the outer end 23a of the holding cylindrical portion 23 described above.
[0024]
In other words, in the state shown in FIG. 1 (or the state shown in FIGS. 2 to 5), the locking ring 12 can move a small dimension in the axial direction L, and thereafter, the locking ring 12 In the pressed state where the tapered outer peripheral surface portion 15 of the locking ring 12 is pressed against the tapered inner surface portion 26 by being pulled out together with the pipe P in the axial direction A while being bitten into the end portion 1, An inner end 27 of the locking ring 12 approaches or abuts on an outer end 23a of the cylindrical portion 23 so as to restrict movement of the locking ring 12 in the axial direction L. The outer end 23a of the portion 23 forms the axial movement restricting means G.
[0025]
Next, a seal groove 28 is recessed in the insertion cylindrical portion 5 that forms the inner peripheral surface side of the circular groove 3, and a packing 29 made of an elastic material such as rubber is attached to the seal groove 28. The packing 29 is pressed tightly against the inner peripheral surface of the pipe P inserted into the pipe P to seal the fluid. As shown in FIG. 14, in the free state (unmounted state) of the packing 29, the width W in the axial direction is the thickness T in the radial direction. 29 The cross-sectional shape is set to be 2.5 to 4 times the flat (slender) cross section.
[0026]
The cross section of the seal groove 28 also has a flat (elongated) cross section, and a packing 29 is fitted in the seal groove 28 while elastically expanding in diameter. A small concave groove 30 is formed on the inner peripheral surface 29a of the packing 29 (near the approximate center in the axial direction L), while the small concave groove 30 is formed on the bottom surface (radial bottom surface) 28a of the seal groove 28. The protrusion 29 is configured to protrude from the locking small ridge 31 to prevent the packing 29 from moving in the axial direction.
[0027]
Further, the packing 29 has a seal ridge 32 having a round cross section in a cross section disposed inward or near the center in the axial direction L, and a guide ridge in the axial direction A outside the seal ridge 32. 33, and is formed into a two-ridged shape by the seal ridge 32 and the guide ridge 33.
In the illustrated example, the guide ridge 33 has a pipe tip guide inclined surface 34 whose diameter is reduced in the direction A outside the axis, has a substantially triangular shape, and is disposed at an end in the direction A outside the axis. I have.
[0028]
As mentioned above, 2.5 × T 29 ≦ W ≦ 4.0 × T 29 Is set to W <2.5 × T 29 In this case, it is difficult to arrange the seal ridges 32 and the guide ridges 33, and when the pipe P is inserted, the packing 29 is twisted to maintain a normal posture in the cross section. It becomes difficult. Conversely, 4.0 × T 29 In the case of <W, the width dimension W becomes unnecessarily excessive, the man-hour for cutting the seal groove 28 is required, and the circular concave groove 3 must be extra deep.
[0029]
Next, an outer wall portion 35 (specifically, the cylindrical cover member 9) surrounding and formed around the middle and the back of the circular concave groove 3 is formed of a transparent synthetic resin with a pipe P inserted therein. Is made visible from the outside. The term “transparent” for the outer wall portion 35 is defined to include colorless and transparent and (colored) translucent. Further, in FIG. 5 (described later), a pear belt 36 is formed on the outer peripheral surface of the outer wall portion 35 of the tubular cover member 9 or the like as a mark indicating a normal insertion position of the end 1 of the pipe P (see FIG. 5). See FIG. 8). The pear belt 36 can be formed at the time of injection molding, for example, by applying a fine uneven pattern to the inner surface of the cavity of a plastic injection mold.
[0030]
By the way, the above-mentioned configuration will be described in more detail with reference to FIGS. The metal joint body 4 is made of a metal such as bronze and has an insertion tube portion 5, and the outer peripheral surface of the distal end of the insertion tube portion 5 is formed into a round shape 37 so that it can be easily inserted into the hole 38 of the pipe P. A seal groove 28 is formed in the middle of the insertion tube portion 5. For example, the depth dimension of the seal groove 28 is the bottom wall thickness dimension T. 28 80% to 100%, the shape of the seal groove 28 is a flat (elongated) rectangle, the strength of the bottom wall 39 is minimized, and the hole 5a of the insertion cylinder 5 is formed. Is made as large as possible to reduce the passage resistance of the fluid. A male screw part 40 is formed near the base end of the insertion tube part 5, and a stepped part 41 is formed at the distal end side of the male screw part 40. To form the inner surface. The proximal end of the insertion tube 5 ends with a stepped portion 42, which is a part of a joint intermediate swelling portion such as a hexagonal head, an intermediate elbow, and a tee.
[0031]
The cylindrical cover member 9 is made of a transparent synthetic resin, has a female screw portion 43 on the inner peripheral surface of the base end, and is detachably screwed to the male screw portion 40. The base end surface of the cylindrical cover member 9 is pressed against the stepped portion 42 to be in the screwed state. The stepped portion 44 on the distal end side of the female screw portion 43 forms the inner surface of the circular groove 3 as a position in the axial direction L corresponding to the stepped portion 41. A smooth pipe insertion hole surface portion 45 is formed from the stepped portion 44 and occupies most of the hole portion of the tubular cover member 9.
[0032]
The inner peripheral surface of the holding cylindrical portion 23 is continuous with the pipe insertion hole surface portion 45 (with the same inner diameter). Further, a small pocket portion 46 is formed on the outer peripheral surface side of the holding cylindrical portion 23 so as to be open in the direction A outside the axial center, and the inner half body portion of the locking ring 12 is inserted into the small pocket portion 46. (Skirt portion) 17 can be stored (see FIGS. 1 to 5). An opening 48 is formed through the small step 47 to which the anti-rattle ring 14 is slidably fitted. On the outer peripheral surface of the cylindrical cover member 9, a large-diameter portion 49 is formed in the middle of the axial direction L, and a male screw portion 51 is formed via a stepped portion 50.
[0033]
The cap member 10 is made of a metal such as bronze, and as shown in FIG. 8, the outer peripheral surface is circular (not hexagonal or two-chamfered) and is once assembled as a pipe joint. ) Indicates that assembly work is possible if the pipe P is inserted without rotating the work tool.
In the cap member 10, a hole is continuously formed in the tapered inner surface portion 26 from the distal end surface 52 via the round portion 53. The tapered inner surface portion 26 is gradually reduced in diameter in the direction A outside the axial center. A large-diameter hole is formed through the stepped portion 54, and a female screw portion 55 is formed in the large-diameter hole portion. The female screw portion 55 is screwed to the male screw portion 51, The cap member 10 is attached to the tubular cover member 9. At this time, as shown in FIG. 1, the cap member 10 is fixed (screwed) to the tubular cover member 9 after the locking ring 12 and the rattling preventing ring 14 have been assembled in advance.
[0034]
As described above, the storage pocket portion 3 </ b> A that stores the locking ring 12 movably in the axial direction L and the radial direction R by the small dimension is formed by the cylindrical cover member 9 and the cap member 10. It is to be noted that the number of specific components can be increased or decreased, the shape can be changed, the division position of the components can be changed, or the like, as desired.
[0035]
Next, the pipe connection operation and operation (operation) will be described.
First, as shown in the left half of FIG. 1, the pipe joint of the present invention is in a state of being assembled in a factory or the like in advance. That is, the packing 29 is fitted in the seal groove 28, and is preferably prevented from displacement by an adhesive. The locking ring 12 and the rattling prevention ring 14 are stored in the storage pocket 3A as shown in FIG. That is, the inner half portion (skirt portion) 17 of the locking ring 12 is externally held on the outer peripheral surface of the holding cylindrical portion 23, and the rattling prevention ring 14 made of an elastic material such as rubber is used. The locking ring 12 is fitted in the opening 48 and constantly elastically presses the locking ring 12 in the inner diameter direction and also inward in the axial direction L, so that the locking ring 12 is inserted into the storage pocket 3A. The movement (rattle) of the small dimension is effectively suppressed, and the locking claw 13 of the locking ring 12 is not eccentric with respect to the pipe joint axis 56 and on an orthogonal plane to the axis 56. Is held so that the locking claw 13 exists (does not fall down).
[0036]
When the end 1 of the pipe P is inserted (inserted) into the circular groove 3 with respect to the pipe joint 2 in this state, first, as shown in FIG. While contacting and slidingly contacting the outer peripheral surface of the insertion tube portion 5, it advances inward (toward the back) into the circular concave groove 3, while guiding the inner peripheral edge of the tip of the pipe P by the inclined surface 34 of the packing 29. The packing 29 is compressed and elastically deformed as shown in FIG. 3, and furthermore, when the pipe P is inserted, the sealing ridge 32 of the packing 29 is compressed and elastically deformed to be in the state of FIG. In FIG. 1, the gaps 57, 57 existing at both ends of the seal groove 28 and the packing 29 in the axial center direction L are eliminated (or reduced) in the state of FIG. 4.
[0037]
Further, when the pipe P is inserted (inserted), as shown in FIG. 5, the foremost surface 58 of the pipe P abuts (buts) on the inner surface of the circular concave groove 3. Through the transparent tubular cover member 9, it is possible to visually check how far the tip end face 58 of the pipe P has been inserted. In particular, it is possible to easily confirm whether or not the front end face 58 is sufficiently inserted in the pear belt 36 as shown in FIG. At this time, the locking claw 13 of the locking ring 12 does not bite sufficiently into the outer peripheral surface of the pipe P.
[0038]
Thereafter, as shown in FIGS. 5 to 6 and FIG. 11, the end 1 of the pipe P is slightly moved (pulled out) in a direction A outside the axis due to a fluid pressure (water pressure) or a fluctuation in temperature. Then, the locking ring 12 is pulled together with the end 1 of the pipe P, the inner half portion (skirt portion) 17 comes off (separates) from the holding cylindrical portion 23, and the tapered outer peripheral surface portion 15 becomes By pressing against the tapered inner surface 26, the locking ring 12 is strongly pressed in the inner diameter direction, and the locking claw 13 bites into the plastic outer layer 8 of the pipe P and is prevented from being pulled out (see FIG. 11). The pear belt 36 is arranged at a corresponding position suitable for confirming the position of the tip end face 58 of the pipe P at this time.
[0039]
Thereafter, when the pipe P thermally expands or an external force acts thereon, the end 1 of the pipe P is pushed (inserted) deep into the circular groove 3 as shown in FIGS. 3 is brought into contact with the frontmost surface 58. In the state shown in FIGS. 6 and 11, the inner end 27 of the locking ring 12 has already approached or contacted the outer end 23 a of the holding cylindrical portion 23, and the locking ring 12 has been moved in the axial direction L. The movement is restricted. The movement is restricted by the action of the axial direction movement restricting means G. Therefore, when changing from FIG. 6 to FIG. 7, the locking ring 12 does not move in the axial direction L, and only the pipe P is inserted (inserted) in the back.
[0040]
After that, when the fluctuation of the fluid pressure, the fluctuation of the temperature rise and fall, the action of the external force, etc. occur, the locking claw 13 bites into the outer peripheral surface of the pipe P strongly in the state of FIG. The pipe P is not easily pulled out (as in FIG. 6) and is strongly connected and held. In the present invention, this is referred to as a restrained holding state.
[0041]
Height H of triangular-shaped locking claw 13 of locking ring 12 Thirteen Is the thickness dimension T of the plastic outer layer 8 of the pipe P. 8 Since the locking claw 13 is set to be smaller than the above and the plurality of notches 22 form the intermittent shape, the problem shown in FIG. 12 can be effectively prevented. That is, it is possible to prevent the problem that the end 8 a of the predetermined length of the plastic outer layer 8 slips through the metal inner layer 6. In other words, the presence of the notch 22 prevents the plastic outer layer 8 from being completely cut into a circle, and maintains the connection as a plastic rib at the notch 22, so that the end 8a does not separate. In FIG. 9, the cut portion 19 is closed so as to be slightly or in contact with each other in the state shown in FIGS. 6, 7, and 11, and the locking ring 12 has a substantially fully closed loop shape (annular shape). ing.
It is sufficient for the pipe P to have at least a plastic outer peripheral surface, and the pipe P may be a two-layered one including a metal layer and an outer plastic, or a pipe made of only plastic.
[0042]
【The invention's effect】
The present invention has the following significant effects by the above configuration.
[0043]
According to the first, second, and third aspects, the conventional work of tightening the cap nut is unnecessary, and simply by inserting the pipe P into the circular groove 3, the pipe connection work is immediately completed. Then, the locking ring 12 is held in a normal position and in a correct posture in the storage pocket portion 3A by the rattling prevention ring 14, and is in a perfect circle with respect to the shaft center 56. It is located on an orthogonal plane and prevents a problem that the insertion of the end portion 1 of the pipe P collides with a part of the circumference of the locking ring 12 to make insertion difficult, and the insertion can be performed extremely smoothly. In addition, if it is attempted to pull out a little after insertion, the locking claw 13 of the locking ring 12 will bite into the outer peripheral surface of the pipe P, and the pulling out can be prevented.
[0044]
Since the straight inner peripheral surface portion 18 of the locking ring 12 is held in a normal posture and size by the holding cylindrical portion 23, the pipe P can be inserted more smoothly. In addition, once the pipe P is inserted to the deepest (rear) of the circular concave groove 3 and then slightly moved in the direction in which the pipe P is pulled out, the tapered outer peripheral surface 15 of the locking ring 12 becomes tapered. It is squeezed while being pressed against the inner surface portion 26, and the locking claw 13 bites into the outer peripheral surface of the pipe P, so that pull-out can be immediately prevented.
[0045]
(According to claim 3) Since the axial movement restricting means G is formed with the outer end 23a of the simple holding cylindrical portion 23, it is compact and the operation is smooth. Moreover, the pipe P can be moved only by a small dimension immediately after the connection (see FIGS. 5 and 6) by the axial movement restricting means G, but thereafter, it hardly moves in the axial direction L. The pipe P can be firmly gripped (locked) (see FIG. 7). That is, if the pipe P moves by a small dimension due to a subsequent fluid pressure fluctuation, thermal expansion, or external force, the stroke possible margin (dimension) is automatically reduced, and the movement of the pipe joint 2 with respect to the pipe P is strongly prevented. be able to. Therefore, the pipe joint of the present invention can easily perform a pipe connection operation and automatically perform a strong connection state (restricted connection state).
[0046]
Since the anti-rattle ring 14 is provided in the storage pocket 3A (according to claim 4), the locking ring 12 is in a normal posture and normal under the state before the pipe P is inserted. By maintaining the size and position, the end 1 of the pipe P can be smoothly inserted (without partially colliding circumferentially with the locking ring 12).
[0047]
(According to Claims 5 and 6) By using only one locking claw 13 (single body), the biting surface pressure is increased, and the locking claw 13 is securely bitten into the outer peripheral surface of the pipe P. Thereby, the pull-out inhibiting force can be made extremely large.
As described with reference to FIG. 12, it is possible to prevent the plastic outer layer 8 from being sliced and the end portion 8a from being pulled out. In addition, electrolytic corrosion can be prevented.
[0048]
(According to claims 7 and 8) The end 1 into which the pipe P is inserted can be visually checked from the outside to easily determine whether or not the pipe P has been inserted to the regular depth of the circular groove 3 (whether or not it has been inserted). Confirmation makes it easy to confirm and inspect when the connection work is completed.
The pear belt 36 is easy to process (according to claim 8), and has a predetermined width, so that a plurality of normal positions on the tip end face 58 of the pipe P can be displayed.
[0049]
(According to claim 9) Since the packing 29 has the round ridge-shaped seal ridge 32 and the guide ridge 33 integrally in a double ridge shape, the packing 29 is not twisted when the pipe P is inserted, and has a normal posture. Can be retained. Moreover, the packing 29 itself is compressed and elastically deformed while smoothly guiding the pipe tip by the guide ridge 33 having the pipe tip guide slope 34. After the insertion, a high sealing performance (sealing performance) is exhibited by the round mountain-shaped sealing projection 32.
[0050]
(According to claim 10) 2.5 × T 29 ≦ W ≦ 4.0 × T 29 By adopting a flat cross section, a shallow seal groove 28 is sufficient, and the insertion tube 5 is made thin, so that a large flow path cross section of the hole 5a of the insertion tube 5 can be secured. Moreover, the packing 29 is less likely to be twisted, and a stable posture can be maintained in the seal groove 28. In addition, the locking of the small locking ridge 31 and the small concave groove 30 prevents the packing 29 from being displaced in the axial direction L, and secures a stable sealing property (sealing property).
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing an unconnected state according to an embodiment of the present invention.
FIG. 2 is a sectional view showing a first stage of inserting a pipe.
FIG. 3 is a sectional view showing a second stage of inserting a pipe.
FIG. 4 is a cross-sectional view showing a third stage of inserting a pipe.
FIG. 5 is a cross-sectional view of a state in which pipe insertion is completed.
FIG. 6 is a cross-sectional view showing a state where a pipe is pulled out by a small dimension.
FIG. 7 is a cross-sectional view showing a state where the pipe is pushed inward again.
FIG. 8 is an external front view mainly explaining a transparent tubular cover member.
9A and 9B are explanatory views of the locking ring, wherein FIG. 9A is a perspective explanatory view and FIG. 9B is a front explanatory view.
FIG. 10 is an explanatory sectional view of a main part.
FIG. 11 is an explanatory sectional view of a main part enlarging operation.
FIG. 12 is a perspective view illustrating a problem.
FIG. 13 is a schematic explanatory view of a circular groove.
FIG. 14 is a sectional view of a packing.
[Explanation of symbols]
1 end
2 Pipe fittings
3 Circular groove
3A storage pocket
5 Insertion tube
6 Metal inner layer
7 Plastic inner layer
8 Plastic outer layer
9 Cylindrical cover member
10 Cap member
12 Lock ring
13 Locking claws
14 Anti-rattle ring
15 Tapered outer surface
18 Straight inner peripheral surface
22 Notch
23 Holding cylinder
23a Outer end
26 Tapered inner surface
27 Inner edge
28 Seal groove
28a bottom
29 Packing
29a Inner peripheral surface
30 small groove
31 Locking small ridge
32 Seal ridge
33 Guide ridge
34 Slope
35 Outer wall part
36 Pear zone
A Outside axis center
G Axial direction movement restricting means
L axis direction
P pipe
R radial direction
T 0 Thickness dimensions
T 8 Thickness dimensions
T 29 Thickness dimensions
W width dimension

Claims (10)

被接続パイプ(P)の端部(1)が差込まれる円形凹溝(3)を軸心外方向(A)へ開口状として有する管継手に於て、上記円形凹溝(3)は、差込まれた上記パイプ(P)の上記端部(1)に食い込むための係止爪(13)を有する係止リング(12)を軸心方向(L)と径方向(R)に小寸法移動可能に収容する収容ポケット部(3A)を、備え、かつ、該収容ポケット部(3A)は上記円形凹溝(3)の外周側に形成され、しかも、上記係止リング(12)が上記収容ポケット部(3A)内にて上記小寸法移動するのを抑制するように該係止リング(12)を弾発的に常時押圧する弾性材質のがたつき防止リング(14)を上記収容ポケット部(3A)内に備えていることを特徴とする管継手。In a pipe joint having a circular concave groove (3) into which the end portion (1) of the connected pipe (P) is inserted in an opening outside the axial center (A), the circular concave groove (3) A locking ring (12) having a locking claw (13) for cutting into the end (1) of the inserted pipe (P) is small in the axial direction (L) and the radial direction (R). A storage pocket portion (3A) for movably storing the storage pocket portion (3A), and the storage pocket portion (3A) is formed on the outer peripheral side of the circular concave groove (3); An anti-rattle ring (14) made of an elastic material that elastically presses the locking ring (12) constantly so as to suppress the small dimension movement in the storage pocket (3A). A pipe joint characterized by being provided in a portion (3A). 被接続パイプ(P)の端部(1)が差込まれる円形凹溝(3)を軸心外方向(A)へ開口状として有する管継手に於て、上記円形凹溝(3)は、差込まれた上記パイプ(P)の上記端部(1)に食い込むための係止爪(13)を有する係止リング(12)を軸心方向(L)と径方向(R)に小寸法移動可能に収容する収容ポケット部(3A)を、備え、かつ、該収容ポケット部(3A)は上記円形凹溝(3)の外周側に形成され、しかも、上記係止リング(12)が上記収容ポケット部(3A)内にて上記小寸法移動するのを抑制するように該係止リング(12)を弾発的に常時押圧する弾性材質のがたつき防止リング(14)を上記収容ポケット部(3A)内に備え、さらに、上記係止リング(12)は上記軸心外方向(A)へ縮径するテーパ状外周面部(15)を有すると共に、ストレート内周面部(18)を有し、かつ、上記収容ポケット部(3A)には上記ストレート内周面部(18)に接触して上記係止リング(12)の姿勢を保つための保持円筒部(23)が設けられ、しかも、上記収容ポケット部(3A)は上記係止リング(12)の上記テーパ状外周面部(15)が圧縮可能なテーパ内面部(26)を軸心外方向(A)の端部寄りに備えていることを特徴とする管継手。In a pipe joint having a circular concave groove (3) into which the end portion (1) of the connected pipe (P) is inserted in an opening outside the axial center (A), the circular concave groove (3) A locking ring (12) having a locking claw (13) for cutting into the end (1) of the inserted pipe (P) is small in the axial direction (L) and the radial direction (R). A storage pocket portion (3A) for movably storing the storage pocket portion (3A), and the storage pocket portion (3A) is formed on the outer peripheral side of the circular concave groove (3); An anti-rattle ring (14) made of an elastic material that elastically presses the locking ring (12) constantly so as to suppress the small dimension movement in the storage pocket (3A). (3A), and the locking ring (12) has a diameter that decreases in the axial direction (A). It has a flared outer peripheral surface (15), has a straight inner peripheral surface (18), and comes into contact with the straight inner peripheral surface (18) in the accommodation pocket (3A). A holding cylindrical portion (23) for maintaining the posture of 12) is provided, and the accommodation pocket portion (3A) is a tapered inner surface on which the tapered outer peripheral surface portion (15) of the locking ring (12) can be compressed. A pipe joint comprising a portion (26) near an end in a direction (A) outside the axial center. 被接続パイプ(P)の端部(1)が差込まれる円形凹溝(3)を軸心外方向(A)へ開口状として有する管継手に於て、上記円形凹溝(3)は、差込まれた上記パイプ(P)の上記端部(1)に食い込むための係止爪(13)を有する係止リング(12)を軸心方向(L)と径方向(R)に小寸法移動可能に収容する収容ポケット部(3A)を、備え、かつ、該収容ポケット部(3A)は上記円形凹溝(3)の外周側に形成され、上記係止リング(12)は上記軸心外方向(A)へ縮径するテーパ状外周面部(15)を有すると共に、ストレート内周面部(18)を有し、かつ、上記収容ポケット部(3A)には上記ストレート内周面部(18)に接触して上記係止リング(12)の姿勢を保つための保持円筒部(23)が設けられ、しかも、上記収容ポケット部(3A)は上記係止リング(12)の上記テーパ状外周面部(15)が圧縮可能なテーパ内面部(26)を軸心外方向(A)の端部寄りに備え、上記係止リング(12)が上記パイプ(P)の上記端部(1)に食い込んだ状態で上記パイプ(P)と共に上記軸心外方向(A)へ引抜かれて上記係止リング(12)の上記テーパ状外周面部(15)が上記テーパ内面部(26)に圧接した圧接状態で、上記保持円筒部(23)の外端(23a)に、上記係止リング(12)の内端(27)が近接乃至当接して上記係止リング(12)が上記軸心方向(L)に移動するのを規制するように構成し、上記保持円筒部(23)の上記外端(23a)をもって軸心方向動き規制手段(G)を形成したことを特徴とする管継手。In a pipe joint having a circular concave groove (3) into which the end portion (1) of the connected pipe (P) is inserted in an opening outside the axial center (A), the circular concave groove (3) A locking ring (12) having a locking claw (13) for cutting into the end (1) of the inserted pipe (P) is small in the axial direction (L) and the radial direction (R). A storage pocket portion (3A) for movably storing the storage pocket portion, the storage pocket portion (3A) is formed on the outer peripheral side of the circular groove (3), and the locking ring (12) is connected to the shaft center. It has a tapered outer peripheral surface portion (15) whose diameter is reduced in the outward direction (A), has a straight inner peripheral surface portion (18), and has a straight inner peripheral surface portion (18) in the accommodation pocket portion (3A). And a holding cylindrical portion (23) for keeping the posture of the locking ring (12) in contact with The accommodation pocket portion (3A) includes a tapered inner surface portion (26) to which the tapered outer peripheral surface portion (15) of the locking ring (12) can be compressed, near the end in the axially outward direction (A). With the locking ring (12) biting into the end (1) of the pipe (P), the locking ring (12) is pulled out together with the pipe (P) in the outer axial direction (A), and the locking ring (12) is removed. When the tapered outer surface (15) is pressed against the tapered inner surface (26), the outer end (23a) of the holding cylindrical portion (23) is connected to the inner end (27) of the locking ring (12). ) Is arranged so as to prevent the locking ring (12) from moving in the axial direction (L) by approaching or abutting thereon, and the outer end (23a) of the holding cylindrical portion (23) is used as a shaft. A pipe joint comprising a center-direction movement restricting means (G). 上記係止リング(12)が上記収容ポケット部(3A)内にて上記小寸法移動するのを抑制するように上記係止リング(12)を弾発的に常時押圧する弾性材質のがたつき防止リング(14)を上記収容ポケット部(3A)内に備えている請求項3記載の管継手。A play of an elastic material which constantly and elastically presses the locking ring (12) so as to prevent the locking ring (12) from moving in the accommodation pocket portion (3A) in the small dimension. 4. The pipe joint according to claim 3, wherein a blocking ring (14) is provided in the receiving pocket (3A). 係止リング(12)は、上記軸心外方向(A)の端部に、上記パイプ(P)に食い込むための係止爪(13)を一条のみ有する請求項1,2,3又は4記載の管継手。The locking ring (12) has only one locking claw (13) at the end in the direction (A) outside the axial center for cutting into the pipe (P). Pipe fittings. 上記パイプ(P)は、金属内層(6)と、その内外に積層されたプラスチック内層(7)・プラスチック外層(8)から成り、係止リング(12)は、上記軸心外方向(A)の端部に、上記パイプ(P)に食い込むための係止爪(13)を一条のみ有し、さらに、該一条の係止爪(13)は複数の切欠部(22)によって断続状に分断され、かつ、上記係止爪(13)の高さ寸法(H13)は、上記プラスチック外層(8)の厚さ寸法(T )よりも小さく設定されている請求項1,2,3,4又は5記載の管継手。The pipe (P) comprises a metal inner layer (6) and a plastic inner layer (7) and a plastic outer layer (8) laminated inside and outside thereof, and a locking ring (12) is provided in the direction (A) outside the axial center. Has only one locking claw (13) for cutting into the pipe (P) at the end thereof, and the single locking claw (13) is intermittently divided by a plurality of notches (22). It is, and the height of the detent pawl (13) (H 13) is claim is set to be smaller than the thickness of the plastic outer layer (8) (T 8) 1,2,3 , 6. The pipe joint according to 4 or 5. 上記円形凹溝(3)の奥部近傍を包囲形成する外壁部位(35)を、透明として、差込まれた上記パイプ(P)の端部(1)を、外部から目視可能とした請求項1,2,3,4,5又は6記載の管継手。The outer wall portion (35) surrounding and forming the vicinity of the inner part of the circular groove (3) is transparent, and the inserted end (1) of the pipe (P) is visible from the outside. The pipe joint according to 1, 2, 3, 4, 5, or 6. 上記円形凹溝(3)の奥部近傍を包囲形成する外壁部位(35)を、透明として、差込まれた上記パイプ(P)の端部(1)を、外部から目視可能とすると共に、上記パイプ(P)の端部(1)の正規差込位置を示す目印として梨地帯(36)を上記外壁部位(35)の外周面に形成した請求項1,2,3,4,5又は6記載の管継手。The outer wall portion (35) surrounding and surrounding the inner part of the circular concave groove (3) is made transparent so that the inserted end portion (1) of the pipe (P) can be viewed from the outside, A pear belt (36) is formed on an outer peripheral surface of said outer wall portion (35) as a mark indicating a normal insertion position of an end (1) of said pipe (P). 6. The pipe joint according to 6. 被接続パイプ(P)の端部(1)が差込まれる円形凹溝(3)を軸心外方向(A)へ開口状として有し、かつ、該円形凹溝(3)の内周面側を構成する挿入筒部(5)を備えた管継手に於て、上記挿入筒部(5)にシール溝(28)を凹設し、さらに、横断面丸山型シール突条(32)と、該シール突条(32)よりも軸心外方向(A)に配設されて該軸心外方向(A)へ縮径するパイプ先端ガイド用勾配面(34)を有するガイド突条(33)とを、二山型として一体に有するパッキン(29)を、上記シール溝(28)に装着したことを特徴とする管継手。A circular groove (3) into which the end (1) of the pipe to be connected (P) is to be inserted, which is open in the direction (A) outside the axial center, and an inner peripheral surface of the circular groove (3); In the pipe joint provided with the insertion tube portion (5) constituting the side, a seal groove (28) is recessed in the insertion tube portion (5), and a cross-section round mountain type seal ridge (32) is formed. A guide ridge (33) having a slope (34) for pipe tip guide disposed outside of the seal ridge (32) in the axial direction (A) and reduced in diameter in the axial direction (A); ) Is mounted in the seal groove (28) with a packing (29) integrally formed as a double crest. 上記パッキン(29)はその自由状態で、軸心方向幅寸法(W)が径方向厚さ寸法(T29)の 2.5倍〜4倍の偏平横断面に設定し、かつ、該パッキン(29)の内周面(29a)に小凹溝(30)を形成すると共に、上記シール溝(28)の底面(28a)には、上記小凹溝(30)に係合する係止小凸条(31)を突設して、上記パッキン(29)の軸心方向移動を阻止するように構成した請求項9記載の管継手。In the free state of the packing (29), the width (W) in the axial direction is set to a flat cross section of 2.5 to 4 times the thickness (T 29 ) in the radial direction, and the packing ( A small concave groove (30) is formed on the inner peripheral surface (29a) of the seal groove (29), and a locking small protrusion engaging with the small concave groove (30) is formed on the bottom surface (28a) of the seal groove (28). 10. The pipe joint according to claim 9, wherein a ridge (31) is provided so as to prevent axial movement of said packing (29).
JP2003124154A 2003-04-28 2003-04-28 Pipe fitting Expired - Lifetime JP4179919B2 (en)

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JP2006118704A (en) * 2004-09-21 2006-05-11 Hitachi Metals Ltd Insertion type joint
EP1657479A1 (en) * 2004-11-11 2006-05-17 Tabuchi Co., Ltd. Plug-in coupling
JP2008163981A (en) * 2006-12-27 2008-07-17 San-Ei Faucet Mfg Co Ltd Connecting structure of pipe and pipe joint
JP2008248909A (en) * 2007-03-29 2008-10-16 Tabuchi Corp Insulating joint
EP1995506A2 (en) 2007-05-23 2008-11-26 Higashio Mech Co., Ltd. Pipe joint
JP2009168179A (en) * 2008-01-17 2009-07-30 Jfe Pipe Fitting Mfg Co Ltd Spigot type pipe joint
JP2009180272A (en) * 2008-01-30 2009-08-13 Jfe Pipe Fitting Mfg Co Ltd Spigot type pipe joint
JP2010060113A (en) * 2008-09-05 2010-03-18 Sekisui Chem Co Ltd Pipe joint
JP2010060112A (en) * 2008-09-05 2010-03-18 Sekisui Chem Co Ltd Pipe joint
JP2010101406A (en) * 2008-10-23 2010-05-06 Maezawa Kyuso Industries Co Ltd Pipe joint
JP2011012755A (en) * 2009-07-02 2011-01-20 Higashio Mech Co Ltd Stopper ring for pipe joint
JP2011033158A (en) * 2009-08-05 2011-02-17 Jfe Pipe Fitting Mfg Co Ltd Spigot type pipe fitting
JP2011089565A (en) * 2009-10-21 2011-05-06 Aron Kasei Co Ltd Pipe joint
JP2012002255A (en) * 2010-06-15 2012-01-05 Kitz Corp Pipe joint
JP2012077804A (en) * 2010-09-30 2012-04-19 Sekisui Chem Co Ltd Pipe joint
JP2013019491A (en) * 2011-07-12 2013-01-31 Daikin Industries Ltd Pipe joint
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006118704A (en) * 2004-09-21 2006-05-11 Hitachi Metals Ltd Insertion type joint
EP1657479A1 (en) * 2004-11-11 2006-05-17 Tabuchi Co., Ltd. Plug-in coupling
JP2008163981A (en) * 2006-12-27 2008-07-17 San-Ei Faucet Mfg Co Ltd Connecting structure of pipe and pipe joint
JP2008248909A (en) * 2007-03-29 2008-10-16 Tabuchi Corp Insulating joint
EP1995506A2 (en) 2007-05-23 2008-11-26 Higashio Mech Co., Ltd. Pipe joint
JP2009168179A (en) * 2008-01-17 2009-07-30 Jfe Pipe Fitting Mfg Co Ltd Spigot type pipe joint
JP2009180272A (en) * 2008-01-30 2009-08-13 Jfe Pipe Fitting Mfg Co Ltd Spigot type pipe joint
JP2010060113A (en) * 2008-09-05 2010-03-18 Sekisui Chem Co Ltd Pipe joint
JP2010060112A (en) * 2008-09-05 2010-03-18 Sekisui Chem Co Ltd Pipe joint
JP2010101406A (en) * 2008-10-23 2010-05-06 Maezawa Kyuso Industries Co Ltd Pipe joint
JP2011012755A (en) * 2009-07-02 2011-01-20 Higashio Mech Co Ltd Stopper ring for pipe joint
JP2011033158A (en) * 2009-08-05 2011-02-17 Jfe Pipe Fitting Mfg Co Ltd Spigot type pipe fitting
JP2011089565A (en) * 2009-10-21 2011-05-06 Aron Kasei Co Ltd Pipe joint
JP2012002255A (en) * 2010-06-15 2012-01-05 Kitz Corp Pipe joint
JP2012077804A (en) * 2010-09-30 2012-04-19 Sekisui Chem Co Ltd Pipe joint
JP2013019491A (en) * 2011-07-12 2013-01-31 Daikin Industries Ltd Pipe joint
CN106584877A (en) * 2016-12-09 2017-04-26 重庆寅悦恒工贸有限公司 Automobile pipe fitting centering mechanism
CN106584877B (en) * 2016-12-09 2023-05-30 重庆寅悦恒工贸有限公司 Pipe fitting centering mechanism for vehicle
US11802643B2 (en) 2018-04-24 2023-10-31 Reliance Worldwide Corporation Fluid connector
US11525534B2 (en) 2018-08-14 2022-12-13 Reliance Worldwide Corporation Tubular connector

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