JP4145183B2 - Pipe fitting - Google Patents

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JP4145183B2
JP4145183B2 JP2003099441A JP2003099441A JP4145183B2 JP 4145183 B2 JP4145183 B2 JP 4145183B2 JP 2003099441 A JP2003099441 A JP 2003099441A JP 2003099441 A JP2003099441 A JP 2003099441A JP 4145183 B2 JP4145183 B2 JP 4145183B2
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tightening
pipe
ring
state
joint body
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JP2004308689A (en
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憲男 水口
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Nasco Fitting Co Ltd
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Nasco Fitting Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、空圧機器・油圧機器の配管、冷熱空調機等の冷媒ガス充填用の配管、住宅用の給水・給湯などの水回り設備の配管などに用いられる金属製パイプを接続するための管継手に関する。
【０００２】
【従来の技術】
配管用の金属製パイプを接続するための管継手として、従来は、パイプを継手本体に挿入するとともに、その継手本体に締付部材を螺合し、この締付部材の螺合によって締付リングを縮径させてパイプの外周に食い込ませ、その食い込みによってパイプを接続状態にロックするとともに、継手本体とパイプの間をシールするようにしたものがある。
【０００３】
尚、本願出願人が知り得る範囲では、上記従来技術が開示されている先行技術文献は存在しないが、当該技術は、実際に、施工現場において汎用手段として広く実施されている。
【０００４】
【発明が解決しようとする課題】
従来では、継手本体に対しパイプを突き当たるまで手で差し込み、その後、スパナなどの工具を用いて所定の角度（例えば、一回転半など）だけ締付部材を回転させることにより締付リングをパイプへ食い込ませてロックとシールを行い、作業を完了するようになっている。
【０００５】
しかしながら、締付部材を所定の角度だけ回転させて作業が完了したと見做す方法では、作業後に、締付部材が所定の角度（回転数）まで正しく回転されたか否かを確認することができない。そのため、作業者の勘違いや不慣れのために、締付リングがパイプに対して十分に食い込まず、ロックとシールが不完全のままでパイプ接続作業が完了してしまうことが懸念される。
本願発明は上記事情に鑑みて創案され、パイプ接続作業が完了したことを目視により確認できるようにすることを目的としている。
【０００６】
【課題を解決するための手段】
請求項１の発明は、金属製のパイプの挿入を可能とした筒状の継手本体と、この継手本体に螺合される筒状の締付部材と、前記締付部材内に収容され、前記継手本体内に挿入された前記パイプを囲むような筒状をなす金属製の締付リングと、パイプ挿入方向に対して傾斜したテーパ面を有し、前記締付部材の螺進に伴い前記締付リングを前記継手本体の内周に対し水密状に密着させつつ縮径方向へ塑性変形させることで、その締付リングが前記パイプの外周に対し遊動規制状態に食い込むとともに水密状態に密着する形態で締め付けた状態である正規の締付け状態に至るようにした縮径手段とを備えてなり、前記継手本体と前記締付部材には、前記締付リングを縮径変形させる締付け方向へ前記締付部材が螺進するのに伴って接近して当接状態に至ることが可能な一対の当接面が設けられており、前記締付部材側の前記当接面は、前記締付部材が締付け方向へ螺進する過程において前記締付リングが前記正規の締付け状態に至った時点で前記継手本体側の前記当接面から離間する位置に形成され、前記継手本体は、前記締付部材が締付け方向へ螺進する過程において前記締付リングが前記正規の締付け状態に至った時点で、前記継手本体の内周と前記パイプの外周との間に前記締付リングが潜り込むことを許容する隙間が形成される形態に形成されており、前記締付部材が締付け方向へ螺進する過程では、前記締付リングが前記正規の締付け状態に至ってから、前記締付部材の螺進が前記一対の当接面が突き当たる位置まで進む間は、前記締付リングが前記継手本体の内周と前記パイプの外周に潜り込むことで、前記締付リングの前記正規の締付け状態が保たれるようになっており、前記締付部材の内周には、内側へ円形に突出する内向き突部が形成され、前記締付リングには、外径が前記内向き突部の内径よりも大きい外向き突部が形成され、前記内向き突部と前記外向き突部が係止することで、前記締付リングが前記締付部材に対して収容されるとともに離脱規制された状態に保持されると共に、前記締付リングには、前記締付部材が締付け方向へ螺進するときに押圧する後端面が形成されており、前記外向き突部が、前記締付リングの後端面からの延出部の外周から突出する形態とされ、前記内向き突部が前記締付リングの後端面と前記外向き突部との間で挟まれた形態で、前記締付リングが前記締付部材に保持されている構成とした。
【０００７】
請求項２の発明は、請求項１の発明において、前記締付リングには、正規の締付け状態で前記継手本体の内周に対しパイプ挿入方向に離間した２カ所で当接するテーパ面とテーパ状当接面とが形成されているとともに、正規の締付け状態で前記パイプの外周に対しパイプ挿入方向に離間した２カ所で当接する締付部と食い込み部とが形成されている構成とした。
【０００８】
請求項３の発明は、請求項１又は２の発明において、前記締付リングの一方の端部が前記パイプに対する締付部とされ、その締付部が前記縮径手段によって縮径させられるのに伴ってその締付リングの他方の端部側が拡径変形を生じるようになっており、前記当接面同士が突き当たる正規の締付け状態では、前記拡径変形部が前記締付部材の内面に対して食い込むことで、その締付部材の回転動作が規制される構成とした。
請求項４の発明は、請求項１〜３のいずれかの発明において、前記継手本体の内周には、前記パイプの挿入方向先端外周縁が当接可能なテーパ状の前止まり面を形成した構成とした。
【０００９】
請求項５の発明は、請求項１〜４のいずれかの発明において、前記縮径手段を構成する前記継手本体側のテーパ面の傾斜角度と前記締付リング側のテーパ面の傾斜角度を互いに異なる角度とした構成とした。
請求項６の発明は、請求項５の発明において、前記締付リングには、縮径変形可能な締付け部が形成されているとともに、前記締付け部に、前記締付リング側のテーパ面が形成されており、前記締付リングが正規の締付け状態となったときには、前記締付け部が、縮径変形することで、前記継手本体側のテーパ面に対して密着する構成とした。
【００１０】
請求項７の発明は、請求項１〜６のいずれかの発明において、前記締付リングには、肉薄状をなすとともに縮径変形可能な形態の締付け部が形成されており、前記締付リングが正規の締付け状態になったときに、前記締付け部が、縮径変形することで、前記パイプの外周面と前記継手本体の内周面との間でパイプ挿入方向と概ね平行なリング状をなして挟み付けられる構成とした。
請求項８の発明は、請求項１〜７のいずれかの発明において、前記継手本体側の前記縮径手段と前記締付リング側の前記縮径手段は、いずれも、傾斜角度が互いに異なり且つパイプ挿入方向に並ぶ複数のテーパ面によって構成した。
【００１１】
請求項９の発明は、請求項１〜８のいずれかの発明において、前記継手本体には、前記締付部材に対しパイプ締付時における螺進方向先方に対応するように識別用傾斜面が形成され、この識別用傾斜面上には弾性的に拡径変形可能な識別リングが摺接可能に配され、前記締付部材の螺進動作が進むのに伴い、その締付部材が前記識別リングを軸方向に押して前記識別用傾斜面上で摺接させつつ拡径変形させる構成とした。
【００１２】
請求項１０の発明は、請求項１〜９のいずれかの発明において、前記継手本体の内部には、その継手本体内の流路を開閉するバルブ機構が設けられている構成とした。
【００１３】
【発明の作用及び効果】
［請求項１の発明］
パイプを継手本体に挿入して締付部材を螺合すると、縮径手段により締付リングがパイプに食い込むことによりパイプが接続状態にロックされ、また、締付リングがパイプの外周に対して水密状態に密着されるとともに、締付リングが継手本体の内周に密着することにより継手本体とパイプの間がシールされる。
【００１４】
また、締付リングがパイプに対して正規の締付け状態になった位置から、さらに締付部材の螺進を進めて一対の当接面同士を突き当てるまでの間、締付リングは正規の締付け状態を保つので、パイプに対する締付リングの締付けが緩むことはない。したがって、パイプの接続に際しては、一対の当接面が突き当たる位置まで締付部材を螺進させる、という作業マニュアルを定めておけば、作業者が作業が完了したか否かを目視によって容易且つ確実に判別することができる。
そして、締付リングが継手本体の内周に対して複数箇所で当接するとともに、締付リングがパイプに対して複数箇所で締め付けるようにしたので、ロックとシールの信頼性に優れている。
【００１６】
［請求項２の発明］
パイプの挿入に先立ち、締付部材は継手本体に浅く螺合した状態で仮組みしておくのであるが、締付部材と締付リングに、互いに係止することでその締付リングを締付部材に対して仮組み状態に保持する仮保持手段を設けているので、締付部材に締付リングを仮組みすることによって両者がユニット化され、全体の仮組み作業が容易となる。
［請求項３の発明］
締付リングの一方の端部の締付部が縮径手段によって縮径させられるのに伴い、締付リングの他方の端部側が拡径変形しその拡径変形部を締付部材の内面に対して食い込ませることで、その締付部材の回転動作を規制するようになっている。これにより、締付部材の緩みを防止し、パイプに対する締付リングの締付け状態を確実に保持することができる。また、締付リングが締付部材の内周に当接することで、両者の間の隙間の容積が小さくなり、締付部材の内部での結露や結氷を抑制または防止することができる。
【００１７】
［請求項４の発明］
継手本体の内周に形成したテーパ状の前止まり面は、パイプを挿入したときにそのパイプを前止まりさせるストッパとなり、パイプを位置決めすることができる。しかも、パイプを前止まりさせた状態から締付部材を螺進させたときには、締付リングと一緒にパイプも挿入方向奥側へ押し動かされるのであるが、このとき、パイプの挿入方向先端縁部と前止まり面とは互いに食い込むようになるので、この食い込みによる摩擦抵抗によってパイプの戻りが規制され、ひいては、締付部材の緩みが防止される。
【００１８】
［請求項５の発明］
縮径手段を構成する継手本体側のテーパ面の傾斜角度と締付リング側のテーパ面との傾斜角度を、互いに同じ傾斜角にした場合には、双方のテーパ面が当接した時点で面接触となり、摩擦抵抗が急激に増大し、その結果、継手本体に対して締付リングが軸方向（パイプ挿入方向）へ相対変位することができず、締付リングが縮径変形できなくなったり、締付リングが座屈してしまう虞がある。
【００１９】
これに対し、本発明では、継手本体側のテーパ面の傾斜角度と締付リング側のテーパ面との傾斜角度を、互いに異なる角度としたので、双方のテーパ面が当接した当初は、周方向の線接触状態となるため面接触状態に比べて摩擦抵抗の増大傾向が緩和される。
尚、テーパ面の当接が進むのに伴って双方の接触面積が増大するのであるが、その接触面積は徐々に増大するため摩擦抵抗の増大傾向も緩やかであり、したがって、締付リングは継手本体に対して軸方向に相対変位しつつ確実に縮径変形することができる。
【００２０】
［請求項６の発明］
上記請求項５の発明において、締付リングが正規の締付け状態となったときには、縮径手段を構成する継手本体側のテーパ面と締付リング側のテーパ面とが互いに密着するようにしているので、双方のテーパ面の間に生じる摩擦抵抗と食い込み作用によって双方のテーパ面が離間し難くなり、ひいては、締付リングの緩みが防止される。
［請求項７の発明］
締付リングが正規の締付け状態になったときに、締付リングの締付け部がパイプの外周面と継手本体の内周面との間でパイプ挿入方向と概ね平行なリング状をなして挟み付けられるようにしているので、締付リングの締付け部はパイプの外周面と継手本体の内周面に対して面接触することになる。これにより、締付け部が座屈する虞がなく、また、面接触により接触面が広くなって摩擦抵抗が増大するため、締付リングの緩みが防止される。しかも、締付け部は径が一定の帯状となるので、締付リングとパイプとの密着領域がパイプ挿入方向において長く確保され、高いシール性を確保することができる。
【００２１】
［請求項８の発明］
継手本体側の縮径手段と締付リング側の縮径手段は、いずれも、傾斜角度が互いに異なり且つパイプ挿入方向に並ぶ複数のテーパ面によって構成されているが、このように傾斜角度の異なる複数のテーパ面同士が密着するようになっているので、シール性に優れている。
［請求項９の発明］
締付部材をパイプ締付け方向へ螺進させる時には識別リングを拡径変形させるようにしたので、識別リングの状態によって締付部材の螺進状態、即ち、締付リングによるパイプの締付状態を確実に判別することができる。
【００２２】
［請求項１０の発明］
継手本体内の流路を開閉するバルブ機構を設けたので、パイプを外したときに、パイプとは反対側に接続された配管内の流体が漏出することを防止できる。
【００２３】
【発明の実施の形態】
［実施形態１］
以下、本発明を具体化した実施形態１を図１及び図２を参照して説明する。
本実施形態の管継手Ｊａは、主として空圧機器・油圧機器等の流体圧作動機器の配管に用いられる銅製のパイプＰを接続させるために用いられる。この他には、冷熱空調機等の冷媒ガス充填用に用いられる金属製のパイプＰや、住宅用の給水・給湯などの水回り設備の配管に用いられる金属製のパイプＰを接続させる場合にも適用することができる。また、本実施形態の管継手Ｊａは、一旦パイプＰを接続した後はそのパイプＰは外さないことを前提とした配管に使用されるものである。
【００２４】
管継手Ｊａは、金属製の継手本体１０、金属製の締付部材２０、及び金属製の締付リング３０から構成されている。尚、以下の説明においては、便宜上、図における右側を前側ということにする。また、前後方向と、管継手Ｊａの軸線と平行な軸方向とを同義で用いる。
継手本体１０は、真鍮製であって、全体として筒状をなし、その外周前端部の雄ネジ部（図示せず）を相手側配管部材（図示せず）に螺合することにより相手側配管部材に接続されるようになっている。継手本体１０の後端部外周には、締付部材２０を螺合させるための雄ネジ部１２が形成され、継手本体１０の外周における雄ネジ部１２よりも前方の位置には正六角形の治具嵌合部１３が形成されている。そして、この治具嵌合部１３の後端面には、軸方向に対して直交する平坦な当接面１４が形成されている。
【００２５】
継手本体１０の中心孔のうち略前半部分は、パイプＰの内径と同じかそれよりも少し径の大きい円形の流通孔１５とされており、中心孔のうち略後半部分は、流通孔１５よりも径が大きく且つ流通孔１５と同心の円形をなす接続孔１６とされている。接続孔１６内には後方からパイプＰの前端部が挿入されるようになっている。流通孔１５と接続孔１６との境界部では段差状に径が異なり、接続孔１６の奥端面（前端面）は軸方向と直交するストッパ１７とされている。
【００２６】
接続孔１６の前端側部分の内周面は、前方に向かって縮径する前部テーパ面１６ａとされており、この前部テーパ面１６ａの後端の内径（前部テーパ面１６ａの最大内径）はパイプＰの外径よりも僅かに大きく、前部テーパ面１６ａの前端の内径（前部テーパ面１６ａの最小内径）はパイプＰの外径よりも僅かに小さく設定されている。接続孔１６の中央部分の内周面は、その前端から後端まで一定の径寸法とされた定径面１６ｂとされている。接続孔１６の後端側部分の内周面は、後方に向かって拡径する後部テーパ面１６ｃ（本発明の構成要件である縮径手段）とされている。また、後部テーパ面１６ｃの前端と定径面１６ｂの後端とは弧状面１６ｄを介して滑らかに連なっている。
【００２７】
締付部材２０は、真鍮製であって、継手本体１０に対しその後側の雄ネジ部１２に螺合されることで組み付けられるようにしたものであり、締付部材２０の内周の略前半部分には雄ネジ部１２に螺合される雌ネジ部２１が形成されている。締付部材２０の内周のうち雌ネジ部２１よりも後方の領域には、内径が一定の円形の収容孔２２が形成されている。また、この収容孔２２の後端には、全周に亘って内側へ収容孔２２と同心の円形に突出する内向き突部２３が仮保持手段として形成されており、この内向き突部２３の前端面内周縁には、テーパ状の誘導面２４が形成されている。さらに、この内向き突部２３の後方には、内向き突部２３の最小内径よりも径が大きい逃がし孔２５が、収容孔２２及び内向き突部２３と同心の円形状に形成されている。そして、この逃がし孔２５の後方、即ち締付部材２０の内周の最後端には、収容孔２２と同心の円形をなすとともに、内径がパイプＰの外径よりも僅かに大きく且つ逃がし孔２５の内径よりも小さい寸法の挿入孔２６が、締付部材２０の後端面に開口して形成されている。
【００２８】
締付部材２０の外周は、継手本体１０の治具嵌合部１３と同じく、正六角形をなす治具嵌合部２７とされている。そして、この治具嵌合部２７の前端面には、軸方向と直交する平坦な当接面２８が形成されている。この当接面２８は継手本体１０の当接面１４に対し面当たり状態で当接するようになっている。
締付リング３０は、パイプＰと同じく銅製であり、継手本体１０内に挿入されたパイプＰを囲むような円筒状をなしている。締付リング３０の前端部は薄肉の締付け部３１となっている。締付け部３１の外周面には、テーパ面３２（本発明の構成要件である縮径手段）が前方に向かって縮径する形態で形成されている。このテーパ面３２の傾斜角度は、継手本体１０の後部テーパ面１６ｃよりも小さい角度に設定されている。
【００２９】
締付け部３１の内周の略前半部分は、外周側のテーパ面３２と略平行な前部傾斜面３３ａとされ、内周の略後半部分は、前部傾斜面３３ａよりも傾斜角度の小さい後部傾斜面３３ｂとされている。この前後両傾斜面３３ａ，３３ｂの境界部分には、斜め前内向きに尖ったエッジ状の食い込み部３３ｃが全周に亘って連続して形成されている。前部傾斜面３３ａ、後部傾斜面３３ｂ及び食い込み部３３ｃの内径は、パイプＰの外径より僅かに大きい寸法とされている。
【００３０】
さらに、締付リング３０の後端面からの延出部には外向き突部３４が仮保持手段として形成されている。この外向き突部３４の外径は、締付部材２０の内向き突部２３の内径よりも僅かに大きい寸法とされている。
次に、本実施形態の作用を説明する。
パイプＰを接続する際には、予め、締付部材２０に対し締付リング３０を前方から挿入し、仮保持状態にしておく。挿入したとき、締付リング３０の外向き突部３４が締付部材２０の内向き突部２３に突き当たるが、双方の径の寸法差はごく僅かであるから、締付リング３０を軸方向に指で押せば、誘導面２４の傾斜により外向き突部３４が僅かに弾性的に縮径変位しつつ内向き突部２３を通過し、通過後は、弾性復帰した外向き突部３４が締付部材２０の逃がし孔２５内に収容される。この状態では、外向き突部３４が内向き突部２３と挿入孔２６の開口縁部との間で前後に挟まれるので、締付リング３０が締付部材２０に対して離脱規制された状態に仮保持される。
【００３１】
この仮保持状態の締付部材２０と締付リング３０を継手本体１０に対し後方から仮組みする。仮組みは、締付部材２０の雌ネジ部２１を継手本体１０の雄ネジ部１２に螺合させて行う。仮組み状態では、締付リング３０の締付け部３１はまだ変形していない。また、締付部材２０の当接面２８は継手本体１０の当接面に対して後方に離間した位置にある。
このように仮組みした管継手Ｊａに対して後方からパイプＰの前端部を挿入する。挿入されたパイプＰは、締付部材２０の挿入孔２６と締付リング３０を順に通過して、継手本体１０の定径面１６ｂ及び前部テーパ面１６ａ内に進入し、パイプＰの前端が前部テーパ面１６ａの内周面の途中の位置（ストッパ１７よりも後方の位置）に当たって前止まりされたところで、手作業によるパイプＰの挿入を終了する。
【００３２】
この後、継手本体１０の治具嵌合部１３と締付部材２０の治具嵌合部２７に、スパナなどの治具（図示せず）を嵌合させ、締付部材２０を前方へ螺進させる方向に回転させる。この締付部材２０の螺進に伴い、両締付リング３０が縮径するように塑性変形させられてパイプＰの外周を締め付ける。即ち、締付部材２０は、前進しつつ、その内向き突部２３により締付リング３０の後端面を前方へ押圧し、その締付リング３０の締付け部３１の前端部が継手本体１０の後部テーパ面１６ｃに軽く当接して前止まりされる。このときの当接は、締付け部３１の前端外周縁が後部テーパ面１６ｃに対して周方向に線接触する形態である。
【００３３】
この後、締付部材２０の螺進と締付リング３０の前進が進むのに伴ない、締付け部３１が、後部テーパ面１６ｃの傾斜と弧状面１６ｄの傾斜に順にしたがって縮径変形させられ、縮径変形が進むのに伴ない、後部テーパ面１６ｃに対する締付け部３１の当接形態が線接触から面接触へ移行し、面接触領域は締付け部３１の外周前端から次第に後方へ拡大していく。
そして、縮径変形した締付け部３１はその前端内周部と食い込み部３３ｃをパイプＰの外周に対して楔のように食い込ませるとともに、パイプＰの外周部と締付け部３１の双方が塑性変形を生じつつ互いに隙間なく水密状に密着される。一方、この締付け部３１の外周は、そのほぼ全領域に亘り、継手本体１０の後部テーパ面１６ｃと弧状面１６ｄに対して隙間なく面接触して水密状に密着した状態となる。
【００３４】
これが、パイプｐに対して締付リング３０が正規に締め付けられた状態であり、この正規の締め付け状態では、パイプＰの外周に食い込んで前後方向への遊動を規制されるとともに、この食い込みによって液体の浸入を不能にシールされる。このように締付部材２０を螺進させる過程において締付リング３０が正規の締め付け状態に至るのであるが、この時点では、締付部材２０の当接面２８は、継手本体１０の当接面１４に対してまだ当接せず、この当接面１４よりも後方へ離間した位置にある。
【００３５】
この時点で、作業者は締付リング３０が正規の締め付け状態になっていることを認知することはできないが、作業マニュアル上では、当接面１４，２８が同士が当接するまで、締付部材２０の螺進を続けることになっているため、正規の締め付け状態になった後も締付部材２０を螺進させる作業は続けられる。そして、当接面１４，２８同士が当接するまで締付部材２０を螺進させたところで、締付部材２０が前止まりされてそれ以上の螺進を規制される。正規の締め付け状態に至った時から当接面１４，２８同士が当接するまで締付部材２０の螺進が続けられる間、締付け部３１は継手本体１０の内周とパイプＰの外周との間に潜り込み続けるので、締付リング３０は正規の締め付け状態を保つ。また、当接面１４，２８同士が当接した状態では、パイプＰの前端が継手本体１０のストッパ１７に突き当たる。但し、締付リング３０の前端面と継手本体１０の後端面との間には隙間が空けられている。以上により、パイプＰの接続作業が完了する。
【００３６】
この状態では、締付リング３０が締付部材２０によって後方（パイプＰの抜け方向）への移動を規制され、その締付リング３０の締付け部３１の前端及び食い込み部３３ｃがパイプＰの外周に対して斜め後方から食い込んでいるため、パイプＰの後方への遊動、即ち管継手Ｊａからの抜けが規制され、パイプＰは確実に接続状態にロックされる。また、締付リング３０の締付け部３１の前端部及び食い込み部３３ｃがパイプＰの外周に密着することで、締付リング３０の内周とパイプＰの外周との隙間が水密状にシールされた状態になるとともに、継手本体１０の接続孔１６の内周と締付リング３０の締付け部３１の外周との間、及び締付リング３０の後端面と締付部材２０の内向き突部２３の前端面との間も、水密状にシールされる。また、継手本体１０の接続孔１６の内周と締付リング３０の締付け部３１の外周との間の摩擦抵抗により、締付リング３０の後方への遊動（緩み）が規制される。
【００３７】
さらに、締付部材２０の螺進に伴なって締付リング３０と一体となって前進したパイプＰの前端部外周は、継手本体１０の前部テーパ面１６ａの内周に対し摺接しつつその傾斜にしたがって縮径するように塑性変形させられて密着した状態となる。したがって、このパイプＰの前端部外周と継手本体１０の前部テーパ面１６ａの内周との間でも水密状にシールされた状態になる。また、このパイプＰの前端部と前部テーパ面１６ａとの間の摩擦抵抗によってもパイプＰの抜け方向への移動が規制される。
【００３８】
本実施形態は次のような効果を発揮する。
（ａ）パイプＰの接続に際しては、締付部材２０を継手本体１０に螺合させるだけでよいから、ロウ付けによって接続する場合とは異なり火気を使用せずに済む。
（ｂ）締付リング３０は前後２箇所でパイプＰの外周を締め付けているので、パイプＰの外周におけるロックとシールが合計２箇所で行われることになり、接続強度とシール性の信頼性に優れている。
【００３９】
（ｃ）締付リング３０がパイプＰに対して正規の締付け状態になった位置から、さらに締付部材２０の螺進を進めて一対の当接面１４，２８同士を突き当てるまでの間、締付リング３０は正規の締付け状態を保つので、パイプＰに対する締付リング３０の締付けが緩むことはない。したがって、パイプＰの接続に際しては、一対の当接面１４，２８が突き当たる位置まで締付部材２０を螺進させる、という作業マニュアルを定めておくことにより、作業者が作業が完了したか否かを目視によって容易且つ確実に判別することができる。
【００４０】
（ｄ）管継手Ｊａを仮組みする際には、締付リング３０を予め締付部材２０に仮組みしてユニット化しておくようにしたので、全体の仮組み作業が容易となっている。
（ｅ）継手本体１０の内周には、パイプＰの前端部（挿入方向先端）の外周縁が当接するテーパ状の前部テーパ面１６ａ（前止まり面）を形成し、この前部テーパ面１６ａが、挿入されたパイプＰを前止まりさせるストッパとなるようにした。これにより、締付部材２０の螺進を開始するときのパイプＰを位置を決めることができる。しかも、パイプＰを前止まりさせた状態から締付部材２０を螺進させるたときには、締付リング３０と一緒にパイプＰも挿入方向奥側へ押し動かされるのであるが、このとき、パイプＰの挿入方向先端縁部と前部テーパ面１６ａとは互いに食い込むようになるので、この食い込みによる摩擦抵抗によってパイプＰの戻り及び締付部材２０の緩みが防止されている。
【００４１】
（ｆ）縮径手段を構成する継手本体１０側の後部テーパ面１６ｃと締付リング３０側のテーパ面３２との傾斜角度は、互いに異なる角度としているが、これは次の理由による。もし、双方のテーパ面１６ｃ，３２を同じ傾斜角にした場合、双方のテーパ面１６ｃ，３２が当接した時点で面接触となり、摩擦抵抗が急激に増大し、その結果、継手本体１０に対して締付リング３０が軸方向（パイプ挿入方向）へ相対変位することができず、締付け部３１が縮径変形できなくなったり、薄肉の締付け部３１が座屈してしまう虞がある。これに対し、本実施形態では双方のテーパ面１６ｃ，３２の傾斜角度を異ならせているので、双方のテーパ面１６ｃ，３２が当接した当初は、周方向の線接触状態となるため面接触状態に比べて摩擦抵抗の増大傾向が緩和され、締付リング３０が円滑に前進できるとともに、締付け部３１の座屈が防止される。尚、テーパ面１６ｃ，３２の当接が進むのに伴って双方の接触面積が増大するのであるが、その接触面積は徐々に増大するため摩擦抵抗の増大傾向も緩やかであり、したがって、締付け部３１は継手本体１０に対して相対変位しつつ確実に縮径変形することができる。
【００４２】
（ｇ）締付リング３０が正規の締付け状態となったときには、縮径手段を構成する継手本体１０側の後部テーパ面１６ｃと締付リング３０側のテーパ面３２とが互いに密着するようにしたので、双方の間の摩擦抵抗と食い込み作用によって双方のテーパ面１６ｃ，３２が離間し難くなり、ひいては、締付リング３０の緩みが防止されている。
［実施形態２］
次に、本発明を具体化した実施形態２を図３を参照して説明する。
【００４３】
本実施形態２の管継手Ｊｂは、上記実施形態１において、締付部材２０に内向き突部２３，誘導面２４，逃がし孔２５を設けず、締付リング３０に外向き突部３４を設けない構成としたものである。その他の構成については上記実施形態１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
［実施形態３］
次に、本発明を具体化した実施形態３を図４及び図５を参照して説明する。
【００４４】
本実施形態２の管継手Ｊｃは、上記実施形態２において、継手本体１０の後端部を後方へ延長するとともに、締付リング３０にこの延長部と対応する面を設けたものである。即ち、継手本体１０の後端には筒状の延長部１８が形成され、この延長部１８の後端を除く内周面は、弧状面１６ｄに連なる後部テーパ面１６ｃとなっている。また、延長部１８の後端部内周は、前方に向かって縮径するとともに後部テーパ面１６ｃよりも傾斜角度の大きいテーパ状受け面１９となっている。一方、本実施形態３の締付リング３０の締付け部３１は実施形態２の締付け部３１よりも前後長が長く、締付け部３１の長さ方向ほぼ中央に形成された食い込み部３３ｃの位置も、実施形態２の食い込み部３３ｃより後方の位置となっている。さらに、締付リング３０には、締付け部３１の外周のテーパ面３２に連なるテーパ状当接面３５が形成されている。このテーパ状当接面３５の傾斜角度は継手本体１０のテーパ状受け面１９の傾斜角度よりも僅かに小さい角度となっている。
【００４５】
本実施形態３の管継手Ｊｃにおいても、上記実施形態１及び２と同じく、締付部材２０が螺進する過程では、当接面１４，２８同士が当接する前に正規の締め付け状態になるとともに、当接面１４，２８同士が当接してパイプＰの接続が完了するまで正規の締め付け状態が保たれる。即ち、締付部材２０の螺進が開始されると、図５に示すように、まず締付け部３１の前端部が継手本体１０の後部テーパ面１６ｃに当接する。締付部材２０の螺進が進むのに伴い、後部テーパ面１６ｃと締付け部３１のテーパ面３２の密着領域（面接触領域）が次第に後方へ拡大していくとともに、締付け部３１の縮径変形が進む。そして、当接面１４，２８同士が当接する直前において、締付リング３０のテーパ状当接面３５が、後部テーパ面１６ｃとテーパ状受け面１９との境界の鈍角の角部に対してその角部を食い込ませるようにして当接することでその当接部分が水密状態となり、締付リング３０が正規の締付け状態に至る。ここから、当接面１４，２８が当接する最終位置に到達するまで締付部材２０の螺進を更に進めていくと、その間、後部テーパ面１６ｃとテーパ状受け面１９との境界の角部がテーパ状当接面３５に対して食い込むように塑性変形して密着した状態となる。
【００４６】
正規の締め付け状態では、締付リング３０は、締付け部３１の前端部及び食い込み部３３ｃの前後２箇所においてパイプＰを締め付けて、パイプＰを確実にロックするとともにパイプＰと締付リング３０との隙間を確実にシールする。また、締付リング３０は、テーパ面３２の前端部及びテーパ状当接面３５の前後２箇所において継手本体１０の内周に対して水密状に密着することにより、継手本体１０と締付リング３０との隙間を確実にシールする。尚、テーパ面３２と継手本体１０の内周との間では、テーパ面３２のうち略前半部分のみが後部テーパ面１６ｃに対して面接触状態で密着し、テーパ面３２の略後半部分は後部テーパ面１６ｃから離間している。食い込み部３３ｃは、この締付け部３１のテーパ面３２と後部テーパ面１６ｃとの密着領域と対応するように位置し、パイプＰの外周に対して食い込むように当接している。
【００４７】
また、締付リング３０が正規の締付け状態になったときに、締付け部３１の前端部がパイプＰの外周面と継手本体１０の内周面との間でパイプ挿入方向と概ね平行なリング状をなして挟み付けられるようになっている。これにより、締付け部３１はパイプＰの外周面と継手本体１０の内周面に対して面接触することになるので、締付け部３１が座屈する虞がなく、また、摩擦抵抗が増大するために締付リング３０の緩みが防止される。しかも、締付け部３１は径が一定の帯状となるので、締付リング３０とパイプＰとの密着領域がパイプ挿入方向において長くなり、高いシール性を確保されている。
【００４８】
また、雄ネジ部１２は延長部１８の前端まで形成されており、締付部材２０の螺進に伴なって延長部１８（特に、前端部分）がテーパ状当接面３５の傾斜によって拡径変形し、その雌ネジ部１２が締付部材２０の雌ネジ部２１に押し付けられ、ネジの山と谷とが強固に食い込むようになるので、この食い込みにより締付部材２０の緩みが防止される。
なお、上記以外の構成については上記実施形態２と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
【００４９】
［実施形態４］
次に、本発明を具体化した実施形態４を図６を参照して説明する。
本実施形態の管継手Ｊｄは、上記実施形態３において、締付部材２０に内向き突部２３，誘導面２４，逃がし孔２５を設けるとともに、締付リング３０に外向き突部３４を設け、締付部材２０に締付リング３０を仮保持するようにしたものである。その他の構成については上記実施形態３と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
【００５０】
［実施形態５］
次に、本発明を具体化した実施形態５を図７及び図８を参照して説明する。
本実施形態の管継手Ｊｅは、上記実施形態１において、締付リング４０，５０を前後２つ設けたものである。即ち、各締付リング４０，５０は、先方に突出する薄肉筒状の締付け部４１，５１を有し、各締付け部４１，５１の外周がテーパ面４２，５２（本発明の構成要件である締付手段）となっている。また、前部締付リング４０の後部内周にもテーパ面４３（本発明の構成要件である締付手段）が形成されている。さらに、後部締付リング５０には、上記実施形態１の締付リング３０と同じく外向き突部３４が形成されていて、後部締付リング５０は締付部材２０に対して仮保持されるようになっている。
【００５１】
正規の締め付け状態では、継手本体１０の後部テーパ面１６ｃと前部締付リング４０のテーパ面４２が面接触し、前部締付リング４０のテーパ面４３と後部締付リングのテーパ面５２とが面接触し、各締付リング４０，５０の締付け部４１，５１の前端部がパイプＰの外周に食い込むように当接する。これにより、パイプＰと締付リング４０，５０との間がシールされるとともに、パイプＰが抜止状態にロックされ、また、各締付リング４０と継手本体１０との間、及び締付リング４０，５０同士の間もシールされる。さらに、締付リング４０，５０のテーパ面４３，５２同士の密着領域においては、摩擦抵抗により前後方向への緩みが防止される。その他の構成については上記実施形態１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
【００５２】
［実施形態６］
次に、本発明を具体化した実施形態６を図９を参照して説明する。
本実施形態の管継手Ｊｆは、上記実施形態４において、継手本体１０の治具嵌合部３の前端面の当接面１４に、全周に亘って連続した円形のスペーサ６０を宛がい、このスペーサ６０の前端面を、締付部材２０の当接面２８に当接可能な当接面６１としたものである。つまり、継手本体１０には、継手本体１０に直接形成した当接面１４と、継手本体１０とは別体部品であるスペーサ６０に形成した当接面６１との２つの当接面が設けられている。
【００５３】
パイプＰの接続過程では、締付部材２０の当接面２８が継手本体１０側の当接面６１に当接するより前に締付リング３０が正規の締付状態となり、その後、締付部材２０の螺進を進めて締付部材２０の当接面２８が継手本体１０の当接面６１に突き当たるまで、締付リング３０による正規の締付状態が保たれる。当接面２８，６１同士が当接した状態では、スペーサ６０の後端面（当接面６１とは反対側の面）が治具嵌合部１３の前端の当接面１４に当接する。
【００５４】
また、一旦接続したパイプＰを外すときには、締付部材２０を緩め、締付リング３０によるパイプＰへの締付け（食い込み）を緩和させ、その状態でパイプＰを前方へ引き抜けば良い。この後、パイプＰを再度接続する際には、締付部材２０を螺進させて締付リング３０をパイプＰの外周に食い込ませればよい。このとき、最初の接続の際に締付リング３０やパイプＰが塑性変形するために締付リング３０の締め付けが甘くなることが懸念されるが、この場合は、予め、スペーサ６０を継手本体１０から外しておく。このようにすると、スペーサ６０の厚さ寸法分だけ締付部材２０の螺進距離が増えるので、当接面２８が治具嵌合部１３の当接面１４に当接するまで締付部材２０を螺進させれば、締付リング３０による締め付けが確実に行われる。このように、本実施形態６においては、パイプＰを着脱したときの増し締めが可能となっている。
【００５５】
その他の構成については上記実施形態４と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
尚、スペーサとしては、全周に亘って連続した円形のものに限らず、図１０に示すように、周方向において一部が切欠されたＣ形リング状のスペーサ６２を用いても良く、図１１に示すように、外周に摘み部６４が突成されたスペーサ６３を用いることもできる。
【００５６】
［実施形態７］
以下、本発明を具体化した実施形態７を図１２を参照して説明する。
本実施形態の管継手Ｊｇは、上記実施形態１の管継手Ｊａにおいて、締付部材の回転を規制する手段を設けたものである。その他の構成については実施形態１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
締付リング３０の外周のうち後端部には、拡径変形部３６が全周に亘って突出する形態で形成されている。締付部材２０を締め付ける前の状態（締付リング３０が変形しない状態）における拡径変形部３６の外径は、締付部材２０の収容孔２２の内径よりも僅かに小さい寸法とされている。
【００５７】
パイプＰの接続作業が完了した状態では、締付リング３０の拡径変形部３６が、その締付け部３１の縮径変形に伴って拡径変形を生じ、締付部材２０の内周、即ち収容孔２２の内周後端及び収容孔２２の後端側端面に対して塑性変形しつつ食い込む。このとき、締付部材２０の内周も拡径状に塑性変形を来す。この締付部材２０に対する拡径変形部３６の食い込みにより、締付部材２０の回転、即ち後方への螺進動作が規制され、締付部材２０は、その当接面２８を継手本体１０の当接面１４に密着（面接触）させた作業完了位置にロックされる。尚、締付部材２０は、当接面１４，２８同士の密着に起因する静摩擦によっても回転規制される。このように締付部材２０が回転不能にロックされることで、締付リング３０もパイプＰに対して正規の締付け状態にロックされる。
【００５８】
尚、本実施形態７では、拡径変形部３６を締付リング３０の後端部外周のみに形成したが、締付リング３０のうち締付け部３１よりも後方の大径部分全体を拡径変形部としてみよい、この場合、大径部分の外周全体が収容孔２２の内周に対して食い込むとともに密着した状態となる。
［実施形態８］
以下、本発明を具体化した実施形態８を図１３及び図１４を参照して説明する。本実施形態８の管継手Ｊｈは、実施形態１の管継手Ｊａにおいて、締付リング３０によるロックとシールが完了したことを標示する手段を設けたものである。その他の構成については上記実施形態１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
【００５９】
継手本体１０の治具嵌合部１３の後面は、前方（図１３及び図１４における右方）へ向けて拡径する識別用傾斜面７０とされている。識別用傾斜面７０の後端部には、定径部７１と、定径部７１の後方に隣接して径方向外向きに突出する係止突部７２とが形成され、さらに、定径部７１よりも前方の傾斜領域には、定径部７１よりも大径の係止凹部７３が形成されている。そして、この識別用傾斜面７０には、有端環状（略Ｃ字形）をなす識別リング７４が嵌合されている。この識別リング７４は、弾性的に拡径変形することを可能とされており、常には、定径部７１に対して外周側から弾性的に当接するとともに係止突部７２により後方への変位を規制された状態に保持されている。尚、この識別リング７４は、締付部材２０や継手本体１０と区別し易くするために、締付部材２０や継手本体１０とは異なる色としてもよい。
【００６０】
締付部材２０を継手本体１０に対して後方へ移動させたアンロック状態（パイプＰを接続する前の状態）では、識別リング７４は、定径部７１に対して弾性的に当接した状態、即ち最も縮径した状態に保持されている。この状態では、識別リング７４は治具嵌合部１３と締付部材２０との間に形成されている溝状に凹部の奥に収容された状態となっているので、識別リング７４は外部から目視し難い状態となっている。また、識別リング７４の後端面は継手本体１０の当接面１４よりも後方に突出する位置にある。
【００６１】
この状態で、パイプＰを挿入して締付部材２０を締付け方向に回転させて前方へ螺進させ、締付リング３０によりパイプＰの締付けを進めると、締付部材２０の前端面が識別リング７４を前方へ押し動かす。識別リング７４は、識別用傾斜面７０上を摺動し、その傾斜にしたがって次第に弾性的に拡径変形する。そして、両当接面１４，２８が当接して締付リング３０によるパイプＰの締付けが完了する位置まで締付部材２０が充分に締め込まれると、識別リング７４が、係止凹部７３に係止するとともに、締付部材２０の外周面とほぼ同じ面上に表れて外部から目視し得る状態となる。
【００６２】
このように、締付部材２０を締め込まない状態（締付リング３０によるロックとシールが解除された状態）では識別リング７４が締付部材２０と治具嵌合部１３との隙間の奥方に位置して外部から目視し難い状態とされ、締付リング３０によるパイプＰの締付けが完了したロック状態では識別リング７４が拡径変形させられて外部から目視し易い状態となるようにしている。したがって、識別リング７４の状態によって、締付部材２０の締め込み動作（ロック及びシール）が完了したかどうかを明確に判別することができる。
【００６３】
［実施形態９］
以下、本発明を具体化した実施形態９を図１５及び図１６を参照して説明する。本実施形態の管継手Ｊｉは、上記実施形態５と同様に締付リング８５Ｆ，８５Ｒを前後２つ設けたものであって、バルブ機構８０を備えている。尚、パイプＰを締め付ける構造については実施形態５と同様であるので詳しい説明は省略し、主としてバルブ機構８０について説明する。
継手本体８１の内周には筒状弁体８２が軸方向（前後方向）への移動可能に設けられ、継手本体８１の前端部に形成した雌ネジ孔８３には弁杆８４の前端が螺合により固定されている。筒状弁体８２は、後端部内周にテーパ面８６を有し、このテーパ面８６が前側に位置する第１締付リング８５Ｆの外周のテーパ面８５Ｆａに当接されている。また、筒状弁体８２の前端部外周にはＯリング８７が装着され、このＯリング８７が継手本体８１の内周に密着することにより、筒状弁体８２と継手本体８１との隙間が水密状にシールされている。かかる筒状弁体８２は、閉弁用バネ８８によって後方、即ち筒状弁体８２のテーパ面８６を第１締付リング８５Ｆのテーパ面８５Ｆａに押圧する方向へ付勢されている。また、筒状弁体８２の前端部の開口部は、前方へ向かって縮径するようなテーパ状の弁口８９となっている。
【００６４】
弁杆８４の後端部外周は、前方へ向かって縮径したテーパ状をなす弁座９０となっており、この弁座９０のテーパの勾配は弁口８９のテーパの勾配と同じ角度に設定されている。また、弁座９０にはＯリング９１が装着されており、このＯリング９１が弁口８９の内周面に密着することにより、弁座９０と弁口８９との間が水密状にシールされるようになっている。尚、継手本体８１の後端部には、雌ネジ孔８３よりも外周側において複数の通孔９２が前後に貫通して形成されており、この通孔９２を介して、継手本体８１に内嵌されたパイプＰと、継手本体８１の前端部の雄ネジ部９３に螺合された相手側配管部材（図示せず）とが連通されるようになっている。
【００６５】
締付部材２０を締め付ける前の状態では、図１５に示すように、筒状弁体８２は閉弁用バネ８８の付勢によってその弁口８９を弁座９０に当接させた状態、即ちバルブ機構８０が閉弁された状態に保持されている。したがって、パイプＰと相手側配管部材との間で流体の流通は行われない。
この状態から締付部材２０を締め付けて当接面１４，２８同士が当接するまで前方へ螺進させると、上記実施形態５で説明したように両締付リング８５Ｆ，８５Ｒがテーパ面８５Ｆｂ，８５Ｒａによって縮径されられてパイプＰの外周に締め付けられ、この締め付けによりパイプＰは後方への遊動を規制された接続状態にロックされるとともに、各締付リング８５Ｆ，８５ＲとパイプＰの外周との間、両締付リング８５Ｆ，８５Ｒのテーパ面８５Ｆｂ，８５Ｒａ同士の間、第１締付リング８５Ｆのテーパ面８５Ｆａと筒状弁体８２のテーパ面８６との間において、水密状にシールされた状態となる。さらに、筒状弁体８２の前端に形成したテーパ状のシール面８２Ａが、継手本体８１の内周に形成したテーパ状のシール面８１Ａに対して水密状に密着し、筒状弁体８２の外周のＯリング８７と協動して筒状弁体８２と継手本体８１との隙間をシールする。
【００６６】
また、締付部材２０の螺進に伴い、筒状弁体８２は、両締付リング８５Ｆ，８５Ｒに押されることにより閉弁用バネ８８の付勢に抗して前方へ移動するため、弁口８９の内周が弁座９０から離間する。これにより、バルブ機構８０が自動的に開弁された状態となる（図１６を参照）。この状態から締付部材２０を緩めると、筒状弁体８２が閉弁用バネ８８の付勢により後方へ移動してその弁口８９の内周が弁座９０に当接し、バルブ機構８０が自動的に閉弁状態となる。
【００６７】
［実施形態１０］
以下、本発明を具体化した実施形態１０を図１７及び図１８を参照して説明する。本実施形態１０の管継手Ｊｊは、上記実施形態９の管継手Ｊｉにおいてバルブ機構を異なる構成としたものである。尚、上記実施形態９と同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
本実施形態１０のバルブ機構１００は、以下の構成になる。
継手本体１０２の内周におけるパイプ挿入領域よりも前方（奥方）には、前方に向かって縮径した弁口１０３が形成され、継手本体１０２の外周の治具嵌合部１０４よりも前方の位置には周方向の受け部１０５が突出形成され、継手本体１０２の外周前端部にはＯリング１０６が装着されている。継手本体１０２の前端部外周には筒状の螺進体１０７が相対回転及び軸方向の移動を可能に装着されている。この螺進体１０７の内周には継手本体１０２のＯリング１０６が密着しており、これにより、螺進体１０７の内周と継手本体１０２の外周との隙間が水密状にシールされている。螺進体１０７の内周の支持壁１０８には雌ネジ孔１０９が形成され、この雌ネジ孔１０９には弁杆１１０の前端部が螺合されている。
【００６８】
弁杆１１０の後端部外周は、前方へ向かって縮径したテーパ状をなす弁座１１１となっており、この弁座１１１のテーパの勾配は弁口１０３のテーパの勾配と同じ角度に設定されている。また、弁座１１１にはＯリング１１２が装着されており、このＯリング１１２が弁口１０３の内周面に密着することにより、弁座１１１と弁口１０３との間が水密状にシールされるようになっている。尚、支持壁１０８には、雌ネジ孔１０９よりも外周側において複数の通孔１１４が前後に貫通して形成されており、この通孔１１４を介して、継手本体１０２に内嵌されたパイプＰと、継手本体１０２の前端部の雌ネジ部１１５に螺合された相手側配管部材（図示せず）とが連通されるようになっている。また、螺進体１０７の外周には雄ネジ部１１６が形成され、この雄ネジ部１１６にはバルブ開閉ナット１１７が螺合されている。バネ部開閉ナット１１７は、その後端の係止部１１８を受け部１０５に対して後方から係止させることで継手本体１０２に対する後方への遊動が規制されているとともに、螺進体１０７と受け部１０５との間に装着した遊動規制バネ１１９の付勢により前方への遊動が規制されている。尚、バルブ開閉ナット１１７は継手本体１０２に対して相対回転し得るようになっている。
【００６９】
螺進体１０７を最も前方へ位置させた状態では、図１７に示すように、螺進体１０７と一体の弁座１１１が弁口１０３の内周に当接することによって、バルブ機構１００は閉弁されている。この状態から、バルブ開閉ナット１１７と螺進体１０７とを相対回転させることで螺進体１０７を後方へ螺進させると、螺進体１０７と一体に後方移動した弁座１１１が弁口１０３の内周から離間し、図１８に示すようにバルブ機構１００が開弁される。この開弁状態では、継手本体１０２の前端に形成したテーパ状のシール面１０２Ａが、螺進体１０７の内周に形成したテーパ状のシール面１０７Ａに対して水密状に密着し、継手本体１０２の外周のＯリング１０６と協動して継手本体１０２と螺進体１０７との隙間をシールする。
【００７０】
上述したバルブ機構１００の開閉は、管継手８０に対するパイプＰの接続とは独立して行われる。つまり、当接面１４，２８同士が密着して締付リング８５Ｆ，８５ＲによるパイプＰの締付けが完全に行われた状態のままでも、バルブ機構１００の開閉を自由に行うことができる。
【００７１】
［実施形態１１］
以下、本発明を具体化した実施形態１１を図１９及び図２０を参照して説明する。本実施形態１１の管継手Ｊｊは、上記実施形態１において、継手本体１０の後端面を、パイプＰの挿抜方向（＝締付部材２０の螺進方向であり、締付リング３０の締付けに伴う移動方向）と直角な平坦面１０ａとするとともに、この平坦面１０ａの内周縁、即ち後部テーパ面１６ｃとの境界となる周縁をエッジ状の角縁部１０ｂとし、更に、締付リング３０に、平坦面１０ａ及び角縁部１０ｂと対向し且つ締付け部３１のテーパ面３２よりも傾斜角度の大きいテーパ状当接面３５を形成したものである。
【００７２】
本実施形態１１の管継手Ｊｊにおいても、上記実施形態１と同じく、締付部材２０が螺進する過程では、当接面１４，２８同士が当接する前に正規の締め付け状態になるとともに、当接面１４，２８同士が当接してパイプＰの接続が完了するまで正規の締め付け状態が保たれる。即ち、締付部材２０の螺進が開始されると、図１９に示すように、まず締付け部３１の前端部が継手本体１０の後部テーパ面１６ｃに当接する。締付部材２０の螺進が進むのに伴い、後部テーパ面１６ｃと締付け部３１のテーパ面３２の密着領域（面接触領域）が次第に後方へ拡大していくとともに、締付け部３１の縮径変形が進む。そして、当接面１４，２８同士が当接する直前において、締付リング３０のテーパ状当接面３５が、平坦面１０ａと後部テーパ面１６ｃとの境界の角縁部１０ｂに対してその角縁部１０ｂを食い込ませるように当接することでその当接部分が水密状態となり、締付リング３０が正規の締付け状態に至る。ここから、当接面１４，２８が当接する最終位置に到達するまで締付部材２０の螺進を更に進めていくと、その間、角縁部１０ｂがテーパ状当接面３５に対して食い込むように塑性変形し、平坦面１０ａとテーパ状当接面３５とが広い範囲で密着（面接触）した状態となる。
【００７３】
正規の締め付け状態では、締付リング３０は、締付け部３１の前端部及び食い込み部３３ｃの前後２箇所においてパイプＰを締め付けて、パイプＰを確実にロックするとともにパイプＰと締付リング３０との隙間を確実にシールする。また、締付リング３０は、テーパ面３２のほぼ全域及びテーパ状当接面３５の前後２箇所において継手本体１０の内周に対して水密状に密着することにより、継手本体１０と締付リング３０との隙間を確実にシールする。尚、締付リング３０とパイプＰとの前後２カ所の当接部分は、後部テーパ面３３ｃとテーパ面３２の広い密着領域（面接触）の範囲内に位置する。
なお、上記以外の構成については上記実施形態１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
【００７４】
［実施形態１２］
次に、本発明を具体化した実施形態１２を図２１及び図２２を参照して説明する。本実施形態の管継手Ｊｌは、前後２つの締付リング４０，５０を有する上記実施形態５において、継手本体１０の後端面を、パイプＰの挿抜方向（＝締付部材２０の螺進方向であり、締付リング４０の締付けに伴う移動方向）と直角な平坦面１０ａとするとともに、この平坦面１０ａの内周縁、即ち後部テーパ面１６ｃとの境界となる周縁をエッジ状の角縁部１０ｂとし、更に、前側の締付リング４０に、平坦面１０ａ及び角縁部１０ｂと対向し且つ締付け部４１のテーパ面４２よりも傾斜角度の大きいテーパ状当接面４５を形成したものである。
【００７５】
本実施形態１２の管継手Ｊｌにおいても、上記実施形態５と同じく、締付部材２０が螺進する過程では、当接面１４，２８同士が当接する前に正規の締め付け状態になるとともに、当接面１４，２８同士が当接してパイプＰの接続が完了するまで正規の締め付け状態が保たれる。即ち、締付部材２０の螺進が開始されると、図２１に示すように、前側の締付リング４０の締付け部４１の前端部が継手本体１０の後部テーパ面１６ｃに当接するとともに、後側の締付リング５０の締付け部５１の前端部が前側の締付リング４０の内周のテーパ面４３に当接する。締付部材２０の螺進が進むのに伴い、後部テーパ面１６ｃとテーパ面４２の密着領域（面接触領域）及びテーパ面４３とテーパ面５２との密着領域（面接触領域）が、夫々、後方へ拡大していくとともに、締付け部４１，５１の縮径変形が進んでいく。
【００７６】
そして、当接面１４，２８同士が当接する直前において、締付リング４０のテーパ状当接面４５が、平坦面１０ａと後部テーパ面１６ｃとの境界の角縁部１０ｂに対してその角縁部１０ｂを食い込ませるように当接することでその当接部分が水密状態となり、締付リング４０が正規の締付け状態に至る。この前側の締付リング４０とほぼ同時又は前後して、後側の締付リング５０も正規の締付け状態に至る。ここから、当接面１４，２８が当接する最終位置に到達するまで締付部材２０の螺進を更に進めていくと、その間、角縁部１０ｂが前側の締付リング４０のテーパ状当接面４５に対して食い込むように塑性変形し、平坦面１０ａとテーパ状当接面４５とが広い範囲で密着した状態となる。
【００７７】
正規の締め付け状態では、締付リング３０は、前側の締付リング４０の締付け部４１の前端部及び後側の締付リング５０の締付け部５１の前端部の前後２箇所においてパイプＰを締め付けて、パイプＰを確実にロックするとともにパイプＰと締付リング３０との隙間を確実にシールする。また、前側の締付リング４０は、テーパ面４２のほぼ全域及びテーパ状当接面４５の前後２箇所において継手本体１０の内周に対して水密状に密着することにより、継手本体１０と締付リング４０との隙間を確実にシールする。また、前後両締付リング４０，５０の間もテーパ面４３とテーパ面５２との密着により水密状態となる。尚、後側の締付リング５０とパイプＰとの当接部分は、前側の締付リング４０と継手本体１０との密着領域よりも後方に位置する。また、前側の締付リング４０とパイプＰとの密着領域は後部テーパ面３３ｃとテーパ面４２の広い密着領域の範囲内に位置する。なお、上記以外の構成については上記実施形態５と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。
【００７８】
［他の実施形態］
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施態様も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
（１）上記実施形態１〜１２では縮径手段のテーパ面を継手本体と締付リングの双方に設けたが、本発明によれば、テーパ面は、締付部材と締付リングのうちのいずれか一方のみに設けてもよい。
（２）上記実施形態１〜１２では締付リングとパイプの双方を銅製としたが、本発明は、銅以外の金属である場合にも適用することができる。
（３）上記実施形態１〜１２では継手本体と締付部材を真鍮製としたが、本発明は、真鍮以外の金属である場合にも適用することができる。
【００７９】
（４）上記実施形態１〜６，８〜１２では、正規の締め付け状態のときに締付リングと締付部材との間に径方向の隙間が空くようにしたが、本発明によれば、実施形態７の締付部材の回転を規制する構造を実施形態１〜６、８〜１２にも適用することができる。
（５）上記実施形態１〜４，６〜１１では１つの締付リングが２カ所においてパイプに食い込むようにしたが、本発明によれば、締付リングが１カ所ずつパイプに食い込むようにしてもよく、３カ所以上でパイプに食い込むようにしてもよい。
（６）上記実施形態３，４，７〜１０では締付リングの前端部の締付け部がパイプに対して帯状に密着するようにしたが、本発明によれば、締付リングの前端部がパイプに対して楔状に食い込むようにしてもよい。
【００８０】
（７）上記実施形態５，９，１０，１２では締付リングを２つ設けたが、本発明によれば、３つ以上の締付リングを設けてもよい。
（８）上記実施形態５，１２では前後の各締付リングが夫々１カ所においてパイプに食い込むようにしたが、本発明によれば、各締付リングが夫々２カ所以上でパイプに食い込むようにしてもよい。
（９）上記実施形態６ではスペーサを１つだけ設けたが、本発明によれば、継手本体に複数のスペーサを予め装着しておき、スペーサを１つずつ外すことによってパイプＰの着脱を複数回行うことができる。
【００８１】
（１０）上記実施形態６のスペーサによって増し締めを可能にする構成は、実施形態１〜５，７〜１２にも適用することができる。
（１１）本発明によれば、上記実施形態８の締付リングによるロックとシールが完了したことを標示する識別手段を設ける構造は、実施形態１〜７、９，１２にも適用できる。
（１２）本発明によれば、上記実施形態９及び１０のバルブ機構は、実施形態１〜８，１１，１２（締付リングが１つ又は複数のいずれの場合）にも適用できる。
【図面の簡単な説明】
【図１】実施形態１における正規の締付け状態をあらわす拡大断面図
【図２】実施形態１においてパイプを浅く挿入した状態の断面図
【図３】実施形態２における正規の締付状態をあらわす拡大断面図
【図４】実施形態３における正規の締付状態をあらわす拡大断面図
【図５】実施形態３においてパイプを浅く挿入した状態の断面図
【図６】実施形態４における正規の締付状態をあらわす拡大断面図
【図７】実施形態５における正規の締付状態をあらわす拡大断面図
【図８】実施形態５においてパイプを浅く挿入した状態の断面図
【図９】実施形態６における正規の締付状態をあらわす拡大断面図
【図１０】実施形態６のスペーサの変形例をあらわす斜視図
【図１１】実施形態６のスペーサの変形例をあらわす斜視図
【図１２】実施形態７における正規の締付状態をあらわす拡大断面図
【図１３】実施形態８においてパイプを浅く挿入した状態の断面図
【図１４】実施形態８における正規の締付状態をあらわす拡大断面図
【図１５】実施形態９においてパイプを接続する前の状態の断面図
【図１６】実施形態９においてパイプを接続した状態の断面図
【図１７】実施形態１０においてバルブ機構が閉弁している状態の断面図
【図１８】実施形態１０においてバルブ機構が開弁している状態の断面図
【図１９】実施形態１１においてパイプを浅く挿入した状態の断面図
【図２０】実施形態１１における正規の締付状態をあらわす拡大断面図
【図２１】実施形態１２においてパイプを浅く挿入した状態の断面図
【図２２】実施形態１２における正規の締付状態をあらわす拡大断面図
【符号の説明】
Ｐ…パイプ
Ｊａ…管継手
１０…継手本体
１４…当接面
１６ｃ…後部テーパ面（縮径手段）
２０…締付部材
２８…当接面
３０…締付リング
３１…締付け部
３２…テーパ面（縮径手段）
Ｊｂ，Ｊｃ，Ｊｄ，Ｊｅ，Ｊｆ，Ｊｇ，Ｊｈ，Ｊｉ，Ｊｊ，Ｊｋ，Ｋｌ…管継手
４０，５０…締付リング
４１，５１…締付け部
４２，４３，５２…テーパ面
６１…当接面[0001]
BACKGROUND OF THE INVENTION
The present invention is for connecting pipes for pneumatic equipment and hydraulic equipment, pipes for refrigerant gas filling such as cooling and heating air conditioners, pipes for water facilities such as water supply and hot water supply for houses, etc. It relates to pipe joints.
[0002]
[Prior art]
Conventionally, as a pipe joint for connecting a metal pipe for piping, a pipe is inserted into a joint body, a fastening member is screwed into the joint body, and a fastening ring is screwed by this fastening member. The diameter of the pipe is reduced to bite into the outer periphery of the pipe, and the pipe is locked in a connected state by the bite, and the joint body and the pipe are sealed.
[0003]
In addition, as far as the applicant of the present application can know, there is no prior art document disclosing the above prior art, but the technology is actually widely implemented as a general-purpose means at construction sites.
[0004]
[Problems to be solved by the invention]
Conventionally, the fastening ring is inserted into the pipe by manually inserting the pipe until it comes into contact with the joint body, and then rotating the fastening member by a predetermined angle (for example, one and a half rotations) using a tool such as a spanner. The work is done by locking in and sealing.
[0005]
However, in the method of assuming that the operation is completed by rotating the tightening member by a predetermined angle, it is possible to check whether the tightening member has been correctly rotated to a predetermined angle (number of rotations) after the operation. Can not. For this reason, there is a concern that due to misunderstanding and unfamiliarity of the operator, the fastening ring does not sufficiently penetrate the pipe, and the pipe connection work is completed with the lock and the seal being incomplete.
The present invention has been made in view of the above circumstances, and has an object of enabling visual confirmation that pipe connection work has been completed.
[0006]
[Means for Solving the Problems]
  The invention according to claim 1 is a cylindrical joint main body capable of inserting a metal pipe, a cylindrical fastening member screwed into the joint main body, and accommodated in the fastening member, It has a cylindrical metal clamping ring that surrounds the pipe inserted into the joint body and a tapered surface that is inclined with respect to the pipe insertion direction. A configuration in which the fastening ring bites into the loosely regulated state and tightly adheres to the water tight state with respect to the outer periphery of the pipe by plastically deforming in the reduced diameter direction while closely attaching the attached ring to the inner circumference of the joint body. A diameter-reducing means adapted to reach a normal tightening state, which is a state of being tightened in a step, and the tightening direction of the joint body and the tightening member in the tightening direction to reduce the diameter of the tightening ring. As the member is screwed, it approaches and abuts A pair of abutting surfaces that can reach the clamping member side, and the abutting surface on the side of the clamping member is arranged so that the clamping ring is in the process of being screwed in the clamping direction. The joint body is formed at a position separated from the abutment surface on the joint body side when the tightening state is reached, and the joint body is configured so that the tightening ring is in the process of screwing in the tightening direction. When the tightening state is reached, a gap is formed between the inner periphery of the joint body and the outer periphery of the pipe to allow the tightening ring to sink, and the tightening member is In the process of screwing in the tightening direction, after the tightening ring reaches the normal tightening state, the tightening ring is moved while the screwing of the tightening member proceeds to a position where the pair of contact surfaces abut against each other. The inner circumference of the joint body and the pad The normal tightening state of the tightening ring is maintained by diving into the outer periphery of the clamp, and an inward protrusion that protrudes in a circular shape is formed on the inner periphery of the tightening member. The tightening ring is formed with an outward protrusion having an outer diameter larger than the inner diameter of the inward protrusion, and the inward protrusion and the outward protrusion are locked, whereby the tightening ring The attached ring is accommodated with respect to the tightening member and is held in a state where the separation is restricted.In addition, a rear end surface that is pressed when the tightening member is screwed in the tightening direction is formed on the tightening ring, and the outward projecting portion extends from the rear end surface of the tightening ring. The tightening ring is configured to protrude from the outer periphery of the extending portion, and the inward projecting portion is sandwiched between the rear end surface of the tightening ring and the outward projecting portion, and the tightening ring is the tightening member. Held inThe configuration.
[0007]
  The invention of claim 2 is the invention of claim 1.BeforeThe clamping ring is formed with a tapered surface and a tapered contact surface that are in contact with each other at two locations spaced in the pipe insertion direction with respect to the inner periphery of the joint body in a properly tightened state. In this state, a tightening portion and a biting portion that are in contact with the outer periphery of the pipe at two locations spaced in the pipe insertion direction are formed.
[0008]
  Claim3The invention of claim1 or 2In the invention, one end portion of the tightening ring is a tightening portion for the pipe, and the other end portion of the tightening ring as the tightening portion is reduced in diameter by the diameter reducing means. In the normal tightening state where the abutting surfaces come into contact with each other, the diameter-enlarged deforming portion bites into the inner surface of the tightening member to rotate the tightening member. The operation is restricted.
  Claim4The invention of claim1-3In any one of the inventions, a tapered front stop surface is formed on the inner periphery of the joint body so that the outer peripheral edge of the pipe in the insertion direction can be brought into contact therewith.
[0009]
  Claim5The invention of claim1-4In any one of the inventions, the inclination angle of the tapered surface on the joint body side and the inclination angle of the tapered surface on the fastening ring side constituting the diameter reducing means are different from each other.
  Claim6The invention of claim5In the invention, the tightening ring is formed with a tightening portion that can be deformed in a reduced diameter, and the tightening portion is formed with a tapered surface on the tightening ring side. When the tightening state is reached, the tightening portion is configured to be in close contact with the tapered surface on the joint body side by deforming with a reduced diameter.
[0010]
  Claim7The invention of claim1-6In any one of the inventions, the tightening ring is formed with a tightening portion having a thin shape and capable of being deformed in a reduced diameter, and when the tightening ring is in a normal tightening state, The tightening part is configured to be sandwiched between the outer peripheral surface of the pipe and the inner peripheral surface of the joint main body in a ring shape that is substantially parallel to the pipe insertion direction by being reduced in diameter.
  Claim8The invention of claim1-7In any of the inventions, the diameter reducing means on the joint body side and the diameter reducing means on the fastening ring side are each configured by a plurality of tapered surfaces having different inclination angles and arranged in the pipe insertion direction. .
[0011]
  Claim9The invention of claim1-8In any of the inventions, an identification inclined surface is formed in the joint body so as to correspond to a forward direction of the screwing direction when the pipe is tightened with respect to the tightening member, and an elastic surface is formed on the identification inclined surface. A discriminating ring that can be expanded in diameter is arranged so as to be slidable, and as the tightening member advances, the tightening member pushes the discriminating ring in the axial direction on the inclined surface for discrimination. It was set as the structure which expands and deforms diameter, making it slide-contact.
[0012]
  Claim10The invention of claim1-9In any one of the inventions, the joint body is provided with a valve mechanism for opening and closing a flow path in the joint body.
[0013]
[Action and effect of the invention]
  [Invention of Claim 1]
  When the pipe is inserted into the joint body and the fastening member is screwed, the fastening ring bites into the pipe by the diameter reducing means, so that the pipe is locked in the connected state, and the fastening ring is watertight against the outer periphery of the pipe. In addition to being in close contact with the state, the fastening ring is in close contact with the inner periphery of the joint body, thereby sealing between the joint body and the pipe.
[0014]
  In addition, from the position where the tightening ring is properly tightened with respect to the pipe, the tightening ring is properly tightened until the pair of contact surfaces are brought into contact with each other by further screwing the tightening member. Since the state is maintained, the tightening of the tightening ring to the pipe is not loosened. Therefore, when connecting the pipes, it is easy and reliable to visually check whether the work is completed or not by establishing a work manual for screwing the tightening member to a position where the pair of contact surfaces abut against each other. Can be determined.
Since the tightening ring abuts on the inner periphery of the joint body at a plurality of locations and the tightening ring is tightened on the pipe at a plurality of locations, the reliability of the lock and the seal is excellent.
[0016]
[Invention of claim 2]
Prior to inserting the pipe, the tightening member is temporarily assembled in a state where it is shallowly screwed into the joint body, but the tightening ring is fastened by engaging the tightening member and the tightening ring. Since the temporary holding means for holding the member in a temporarily assembled state is provided, by temporarily mounting the tightening ring on the tightening member, both are unitized, and the entire temporary assembly work is facilitated.
  [Claims3Invention of]
  As the tightening portion at one end of the tightening ring is reduced in diameter by the diameter reducing means, the other end side of the tightening ring is expanded and deformed on the inner surface of the tightening member. On the other hand, the rotational movement of the tightening member is regulated by biting in. As a result, the tightening member can be prevented from loosening, and the tightening state of the tightening ring with respect to the pipe can be reliably maintained. Further, since the tightening ring abuts on the inner periphery of the tightening member, the volume of the gap between them is reduced, and condensation or icing inside the tightening member can be suppressed or prevented.
[0017]
  [Claims4Invention of]
  The tapered front stop surface formed on the inner periphery of the joint body serves as a stopper for stopping the pipe when the pipe is inserted, and the pipe can be positioned. Moreover, when the fastening member is screwed from the state where the pipe is stopped in front, the pipe is also pushed to the back in the insertion direction together with the fastening ring. Since the front stop surface bites into each other, the frictional resistance caused by the biting restricts the return of the pipe, thereby preventing the tightening member from loosening.
[0018]
  [Claims5Invention of]
  When the inclination angle of the taper surface on the joint body side and the taper surface on the fastening ring side constituting the diameter reducing means are set to the same inclination angle, the surface at the time when both taper surfaces contact each other. As a result, the frictional resistance increases abruptly. As a result, the clamping ring cannot be displaced relative to the joint body in the axial direction (pipe insertion direction), and the clamping ring cannot be reduced in diameter. There is a risk of the buckling ring buckling.
[0019]
On the other hand, in the present invention, the inclination angle of the tapered surface on the joint body side and the inclination angle of the tapered surface on the fastening ring side are different from each other. Since the direction is in the line contact state, the tendency to increase the frictional resistance is alleviated compared to the surface contact state.
As the contact of the taper surface advances, both contact areas increase. However, since the contact area gradually increases, the frictional resistance tends to increase gradually. The diameter can be reliably reduced and deformed while being relatively displaced in the axial direction with respect to the main body.
[0020]
  [Claims6Invention of]
  Claims above5In the present invention, when the tightening ring is in the normal tightening state, the tapered surface on the joint body side and the tapered surface on the tightening ring side constituting the diameter reducing means are in close contact with each other. The frictional resistance generated between the tapered surfaces and the biting action make it difficult for the two tapered surfaces to be separated from each other, thereby preventing the tightening ring from loosening.
  [Claims7Invention of]
  When the tightening ring is in the proper tightening state, the tightening part of the tightening ring is sandwiched between the outer peripheral surface of the pipe and the inner peripheral surface of the joint body in a ring shape that is generally parallel to the pipe insertion direction. Therefore, the tightening portion of the tightening ring comes into surface contact with the outer peripheral surface of the pipe and the inner peripheral surface of the joint body. Thereby, there is no possibility that the tightening portion is buckled, and the contact surface is widened by surface contact and the frictional resistance is increased, so that the tightening ring is prevented from loosening. In addition, since the tightening portion has a band shape with a constant diameter, a close contact area between the tightening ring and the pipe is ensured long in the pipe insertion direction, and high sealing performance can be ensured.
[0021]
  [Claims8Invention of]
  The diameter reducing means on the joint main body side and the diameter reducing means on the fastening ring side are each configured by a plurality of tapered surfaces having different inclination angles and arranged in the pipe insertion direction. Since the plurality of tapered surfaces are in close contact with each other, the sealing performance is excellent.
  [Claims9Invention of]
  When the tightening member is screwed in the pipe tightening direction, the diameter of the identification ring is deformed and deformed, so that the screwing state of the tightening member, that is, the tightening state of the pipe by the tightening ring is ensured depending on the state of the identification ring. Can be determined.
[0022]
  [Claims10Invention of]
  Since the valve mechanism for opening and closing the flow path in the joint body is provided, it is possible to prevent the fluid in the pipe connected to the opposite side of the pipe from leaking when the pipe is removed.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The pipe joint Ja of the present embodiment is mainly used for connecting a copper pipe P used for piping of fluid pressure operating equipment such as pneumatic equipment and hydraulic equipment. In addition to this, when connecting a metal pipe P used for refrigerant gas filling such as a cold air conditioner, or a metal pipe P used for plumbing equipment such as water supply / hot water supply for houses. Can also be applied. Moreover, the pipe joint Ja of this embodiment is used for piping on the assumption that once the pipe P is connected, the pipe P is not removed.
[0024]
The pipe joint Ja includes a metal joint body 10, a metal fastening member 20, and a metal fastening ring 30. In the following description, for the sake of convenience, the right side in the figure is referred to as the front side. Moreover, the front-rear direction and the axial direction parallel to the axis of the pipe joint Ja are used synonymously.
The joint body 10 is made of brass and has a tubular shape as a whole. The male pipe portion (not shown) at the front end of the outer periphery is screwed into the counterpart pipe member (not shown), thereby mating the pipe. It is connected to the member. A male screw portion 12 for screwing the fastening member 20 is formed on the outer periphery of the rear end portion of the joint main body 10, and a regular hexagonal jig is provided at a position in front of the male screw portion 12 on the outer periphery of the joint main body 10. A tool fitting portion 13 is formed. A flat contact surface 14 that is orthogonal to the axial direction is formed on the rear end surface of the jig fitting portion 13.
[0025]
A substantially first half portion of the center hole of the joint body 10 is a circular flow hole 15 having the same diameter as or slightly larger than the inner diameter of the pipe P. Also, the connection hole 16 has a large diameter and a circular shape concentric with the flow hole 15. The front end of the pipe P is inserted into the connection hole 16 from the rear. The boundary portion between the flow hole 15 and the connection hole 16 has a step-like difference in diameter, and the back end surface (front end surface) of the connection hole 16 is a stopper 17 orthogonal to the axial direction.
[0026]
The inner peripheral surface of the front end side portion of the connection hole 16 is a front tapered surface 16a that is reduced in diameter toward the front. ) Is slightly larger than the outer diameter of the pipe P, and the inner diameter of the front end of the front taper surface 16a (the minimum inner diameter of the front taper surface 16a) is set slightly smaller than the outer diameter of the pipe P. The inner peripheral surface of the central portion of the connection hole 16 is a constant diameter surface 16b having a constant diameter from the front end to the rear end. The inner peripheral surface of the rear end portion of the connection hole 16 is a rear taper surface 16c (diameter reducing means that is a constituent of the present invention) that increases in diameter toward the rear. Further, the front end of the rear tapered surface 16c and the rear end of the constant diameter surface 16b are smoothly connected via an arcuate surface 16d.
[0027]
The tightening member 20 is made of brass and is assembled by being screwed into the male threaded portion 12 on the rear side of the joint body 10, and is substantially the first half of the inner periphery of the tightening member 20. A female screw portion 21 that is screwed into the male screw portion 12 is formed in the portion. A circular accommodation hole 22 having a constant inner diameter is formed in a region behind the female screw portion 21 in the inner periphery of the tightening member 20. Further, an inward projection 23 is formed as a temporary holding means at the rear end of the accommodation hole 22 so as to protrude inward in a circular shape concentric with the accommodation hole 22 over the entire circumference. A tapered guide surface 24 is formed on the inner periphery of the front end surface. Further, an escape hole 25 having a diameter larger than the minimum inner diameter of the inward projection 23 is formed in a circular shape concentric with the accommodation hole 22 and the inward projection 23 behind the inward projection 23. . Then, at the rear of the escape hole 25, that is, at the rearmost end of the inner periphery of the fastening member 20, a circular shape concentric with the accommodation hole 22 is formed, and the inner diameter is slightly larger than the outer diameter of the pipe P and the escape hole 25. An insertion hole 26 having a size smaller than the inner diameter of the fastening member 20 is formed in the rear end face of the fastening member 20.
[0028]
The outer periphery of the fastening member 20 is a jig fitting part 27 having a regular hexagonal shape, similar to the jig fitting part 13 of the joint body 10. A flat contact surface 28 perpendicular to the axial direction is formed on the front end surface of the jig fitting portion 27. The contact surface 28 comes into contact with the contact surface 14 of the joint body 10 in a surface contact state.
The fastening ring 30 is made of copper like the pipe P, and has a cylindrical shape surrounding the pipe P inserted into the joint body 10. The front end portion of the tightening ring 30 is a thin tightening portion 31. On the outer peripheral surface of the tightening portion 31, a tapered surface 32 (diameter reducing means that is a constituent element of the present invention) is formed in a form of reducing the diameter toward the front. The inclination angle of the tapered surface 32 is set to be smaller than the rear tapered surface 16c of the joint body 10.
[0029]
A substantially front half portion of the inner periphery of the tightening portion 31 is a front inclined surface 33a substantially parallel to the outer peripheral taper surface 32, and a substantially rear half portion of the inner periphery is a rear portion having a smaller inclination angle than the front inclined surface 33a. It is set as the inclined surface 33b. At the boundary between the front and rear inclined surfaces 33a and 33b, an edge-shaped biting portion 33c that is inclined obliquely forward and inward is continuously formed over the entire circumference. The inner diameters of the front inclined surface 33a, the rear inclined surface 33b, and the biting portion 33c are slightly larger than the outer diameter of the pipe P.
[0030]
Further, an outward projecting portion 34 is formed as a temporary holding means on the extending portion from the rear end surface of the tightening ring 30. The outer diameter of the outward protrusion 34 is slightly larger than the inner diameter of the inward protrusion 23 of the fastening member 20.
Next, the operation of this embodiment will be described.
When connecting the pipe P, the fastening ring 30 is inserted into the fastening member 20 from the front in advance to be in a temporarily held state. When inserted, the outward projecting portion 34 of the tightening ring 30 abuts the inward projecting portion 23 of the tightening member 20. However, since the difference in diameter between the two is negligible, the tightening ring 30 is moved in the axial direction. When pushed with a finger, the outward projection 34 passes through the inward projection 23 while being slightly elastically reduced in diameter due to the inclination of the guide surface 24, and after passing, the outward projection 34 that has returned elastically is tightened. The attaching member 20 is accommodated in the escape hole 25. In this state, since the outward protrusion 34 is sandwiched between the inward protrusion 23 and the opening edge of the insertion hole 26, the fastening ring 30 is restricted from being separated from the fastening member 20. Temporarily held.
[0031]
The fastening member 20 and the fastening ring 30 in the temporarily held state are temporarily assembled to the joint body 10 from the rear. The temporary assembly is performed by screwing the female screw portion 21 of the fastening member 20 into the male screw portion 12 of the joint body 10. In the temporarily assembled state, the tightening portion 31 of the tightening ring 30 is not yet deformed. Further, the contact surface 28 of the tightening member 20 is at a position spaced rearward from the contact surface of the joint body 10.
The front end portion of the pipe P is inserted from the rear into the temporarily assembled pipe joint Ja. The inserted pipe P sequentially passes through the insertion hole 26 and the tightening ring 30 of the tightening member 20 and enters the constant diameter surface 16b and the front tapered surface 16a of the joint body 10, and the front end of the pipe P is When the front tapered surface 16a hits a position on the middle of the inner peripheral surface (a position behind the stopper 17) and stops in front, the manual insertion of the pipe P is finished.
[0032]
Thereafter, a jig (not shown) such as a spanner is fitted into the jig fitting portion 13 of the joint body 10 and the jig fitting portion 27 of the fastening member 20, and the fastening member 20 is screwed forward. Rotate in the direction to advance. As the tightening member 20 is screwed, the outer periphery of the pipe P is tightened by being plastically deformed so that both the tightening rings 30 are reduced in diameter. That is, while the fastening member 20 moves forward, the inward projection 23 presses the rear end surface of the fastening ring 30 forward, and the front end portion of the fastening portion 31 of the fastening ring 30 is the rear portion of the joint body 10. Lightly abuts against the tapered surface 16c and stops in front. The contact at this time is a form in which the outer peripheral edge of the front end of the tightening portion 31 is in line contact with the rear tapered surface 16c in the circumferential direction.
[0033]
Thereafter, as the screwing of the tightening member 20 and the advancement of the tightening ring 30 proceed, the tightening portion 31 is reduced in diameter in accordance with the inclination of the rear taper surface 16c and the inclination of the arcuate surface 16d. As the diameter reduction progresses, the contact form of the tightening portion 31 with respect to the rear tapered surface 16c shifts from line contact to surface contact, and the surface contact area gradually expands rearward from the outer peripheral front end of the tightening portion 31. .
Then, the tightening portion 31 that has undergone the diameter reduction causes the inner peripheral portion of the front end and the biting portion 33c to bite into the outer periphery of the pipe P like a wedge, and both the outer peripheral portion of the pipe P and the tightening portion 31 undergo plastic deformation. While produced, they are in close contact with each other without gaps. On the other hand, the outer periphery of the tightening portion 31 is in a state of being in close contact with the rear taper surface 16c and the arcuate surface 16d of the joint body 10 in a watertight manner without any gaps over the entire region.
[0034]
This is a state in which the tightening ring 30 is normally tightened with respect to the pipe p. In this normal tightened state, the movement in the front-rear direction is controlled by biting into the outer periphery of the pipe P, and the liquid is It is sealed so that it cannot enter. In this way, the tightening ring 30 reaches the normal tightening state in the process of screwing the tightening member 20. At this time, the contact surface 28 of the tightening member 20 is the contact surface of the joint body 10. 14 is not yet in contact with the contact surface 14 and is located at a position separated rearward from the contact surface 14.
[0035]
At this time, the operator cannot recognize that the tightening ring 30 is in the normal tightening state, but on the work manual, the tightening member until the contact surfaces 14 and 28 come into contact with each other. Since the screwing of 20 is to be continued, the work of screwing the tightening member 20 is continued even after the normal tightening state is reached. When the tightening member 20 is screwed until the contact surfaces 14 and 28 come into contact with each other, the tightening member 20 is stopped in front and the further screwing is restricted. While the screwing of the tightening member 20 is continued until the contact surfaces 14 and 28 come into contact with each other after the normal tightening state is reached, the tightening portion 31 is between the inner periphery of the joint body 10 and the outer periphery of the pipe P. Therefore, the tightening ring 30 maintains the normal tightening state. Further, when the contact surfaces 14 and 28 are in contact with each other, the front end of the pipe P abuts against the stopper 17 of the joint body 10. However, a gap is provided between the front end surface of the tightening ring 30 and the rear end surface of the joint body 10. Thus, the connection work of the pipe P is completed.
[0036]
In this state, the tightening ring 30 is restricted from moving rearward (in the direction of removal of the pipe P) by the tightening member 20, and the front end of the tightening portion 31 and the biting portion 33c of the tightening ring 30 are located on the outer periphery of the pipe P. On the other hand, since it bites in obliquely from the rear, the backward movement of the pipe P, that is, the disconnection from the pipe joint Ja is restricted, and the pipe P is securely locked in the connected state. Further, the front end portion of the tightening portion 31 of the tightening ring 30 and the biting portion 33c are in close contact with the outer periphery of the pipe P, so that the gap between the inner periphery of the tightening ring 30 and the outer periphery of the pipe P is sealed in a watertight manner. At the same time, between the inner periphery of the connection hole 16 of the joint body 10 and the outer periphery of the tightening portion 31 of the tightening ring 30 and between the rear end surface of the tightening ring 30 and the inward projection 23 of the tightening member 20. The space between the front end face is also sealed in a watertight manner. Further, the backward movement (loosening) of the tightening ring 30 is restricted by the frictional resistance between the inner periphery of the connection hole 16 of the joint body 10 and the outer periphery of the tightening portion 31 of the tightening ring 30.
[0037]
Further, the outer periphery of the front end of the pipe P, which has been advanced integrally with the tightening ring 30 as the tightening member 20 is screwed, is in sliding contact with the inner periphery of the front tapered surface 16a of the joint body 10. It is in a state of being in close contact with being plastically deformed so as to reduce its diameter according to the inclination. Therefore, even between the outer periphery of the front end portion of the pipe P and the inner periphery of the front taper surface 16a of the joint body 10, the pipe P is sealed in a watertight manner. Further, the movement of the pipe P in the removal direction is also restricted by the frictional resistance between the front end portion of the pipe P and the front tapered surface 16a.
[0038]
This embodiment exhibits the following effects.
(A) When the pipe P is connected, it is only necessary to screw the fastening member 20 into the joint body 10, so that it is not necessary to use fire unlike the case of connecting by brazing.
(B) Since the tightening ring 30 tightens the outer periphery of the pipe P at two front and rear positions, locking and sealing on the outer periphery of the pipe P are performed at a total of two positions, so that the connection strength and the reliability of the sealing performance are improved. Are better.
[0039]
(C) From the position where the tightening ring 30 is in the normal tightening state with respect to the pipe P, the screw member 20 is further screwed forward until the pair of contact surfaces 14 and 28 are brought into contact with each other. Since the tightening ring 30 maintains a normal tightening state, the tightening of the tightening ring 30 to the pipe P does not loosen. Therefore, when the pipe P is connected, whether or not the worker has completed the work by setting a work manual for screwing the fastening member 20 to a position where the pair of contact surfaces 14 and 28 abut against each other. Can be easily and reliably determined visually.
[0040]
(D) When the pipe joint Ja is temporarily assembled, the fastening ring 30 is temporarily assembled to the fastening member 20 in advance to form a unit, so that the entire temporary assembly work is facilitated.
(E) A tapered front taper surface 16a (front stop surface) with which the outer peripheral edge of the front end portion (tip in the insertion direction) of the pipe P abuts is formed on the inner periphery of the joint body 10, and this front taper surface 16a became a stopper which stops the inserted pipe P forward. Thereby, the position of the pipe P when the screwing of the tightening member 20 is started can be determined. Moreover, when the fastening member 20 is screwed from the state in which the pipe P is stopped at the front, the pipe P is pushed and moved together with the fastening ring 30 to the back in the insertion direction. Since the leading edge portion in the insertion direction and the front taper surface 16a bite each other, the return of the pipe P and the loosening of the fastening member 20 are prevented by the frictional resistance caused by this biting.
[0041]
(F) The inclination angles of the rear tapered surface 16c on the joint main body 10 side and the tapered surface 32 on the fastening ring 30 constituting the diameter reducing means are different from each other, for the following reason. If both the tapered surfaces 16c and 32 have the same inclination angle, surface contact occurs when both the tapered surfaces 16c and 32 come into contact with each other, and the frictional resistance increases abruptly. Therefore, the fastening ring 30 cannot be relatively displaced in the axial direction (pipe insertion direction), and the fastening portion 31 cannot be reduced in diameter, or the thin fastening portion 31 may be buckled. On the other hand, in the present embodiment, since the inclination angles of the two tapered surfaces 16c and 32 are different from each other, when the two tapered surfaces 16c and 32 come into contact with each other, a line contact state in the circumferential direction is brought about, so that the surface contact occurs. Compared to the state, the tendency to increase the frictional resistance is alleviated, the tightening ring 30 can be smoothly advanced, and buckling of the tightening portion 31 is prevented. As the contact of the taper surfaces 16c and 32 advances, the contact area of both increases, but the contact area gradually increases, so the tendency of the frictional resistance to increase gradually. 31 can be reliably reduced in diameter while being relatively displaced with respect to the joint body 10.
[0042]
(G) When the tightening ring 30 is in a proper tightening state, the rear tapered surface 16c on the joint body 10 side and the tapered surface 32 on the tightening ring 30 side that constitute the diameter reducing means are in close contact with each other. Therefore, both the tapered surfaces 16c and 32 are difficult to separate due to the frictional resistance and the biting action between them, and as a result, the tightening ring 30 is prevented from loosening.
[Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0043]
In the pipe joint Jb of the second embodiment, in the first embodiment, the fastening member 20 is not provided with the inward projection 23, the guide surface 24, and the escape hole 25, and the fastening ring 30 is provided with the outward projection 34. There is no configuration. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and descriptions of structures, operations, and effects are omitted.
[Embodiment 3]
Next, a third embodiment of the present invention will be described with reference to FIGS.
[0044]
The pipe joint Jc according to the second embodiment is obtained by extending the rear end portion of the joint main body 10 backward in the second embodiment and providing a surface corresponding to the extension portion on the fastening ring 30. That is, a cylindrical extension 18 is formed at the rear end of the joint body 10, and the inner peripheral surface excluding the rear end of the extension 18 is a rear tapered surface 16c continuous with the arcuate surface 16d. Further, the inner periphery of the rear end portion of the extension portion 18 is a tapered receiving surface 19 that is reduced in diameter toward the front and has a larger inclination angle than the rear tapered surface 16c. On the other hand, the tightening portion 31 of the tightening ring 30 of the third embodiment is longer in the front-rear length than the tightening portion 31 of the second embodiment, and the position of the biting portion 33c formed at substantially the center in the length direction of the tightening portion 31 is also as follows. The position is behind the biting portion 33c of the second embodiment. Further, the fastening ring 30 is formed with a tapered contact surface 35 that is continuous with the tapered surface 32 on the outer periphery of the fastening portion 31. The inclination angle of the tapered contact surface 35 is slightly smaller than the inclination angle of the tapered receiving surface 19 of the joint body 10.
[0045]
Also in the pipe joint Jc of the third embodiment, as in the first and second embodiments, in the process in which the tightening member 20 is screwed, a normal tightening state is obtained before the contact surfaces 14 and 28 come into contact with each other. The normal tightening state is maintained until the contact surfaces 14 and 28 come into contact with each other and the connection of the pipe P is completed. That is, when the screwing of the tightening member 20 is started, the front end portion of the tightening portion 31 first comes into contact with the rear taper surface 16c of the joint body 10 as shown in FIG. As the tightening member 20 advances, the contact area (surface contact area) between the rear taper surface 16c and the taper surface 32 of the tightening portion 31 gradually expands rearward, and the diameter of the tightening portion 31 is reduced. Advances. Then, immediately before the contact surfaces 14 and 28 contact each other, the tapered contact surface 35 of the tightening ring 30 is against the obtuse corner of the boundary between the rear tapered surface 16c and the tapered receiving surface 19. By abutting so as to bite the corner portion, the abutting portion becomes watertight, and the tightening ring 30 reaches a normal tightening state. From this point, when the screwing of the tightening member 20 is further advanced until it reaches the final position where the contact surfaces 14 and 28 contact, the corner portion of the boundary between the rear tapered surface 16c and the tapered receiving surface 19 is obtained. Is brought into close contact with the tapered contact surface 35 by plastic deformation.
[0046]
In a normal tightening state, the tightening ring 30 tightens the pipe P at two positions before and after the front end portion of the tightening portion 31 and the biting portion 33c to securely lock the pipe P, and between the pipe P and the tightening ring 30. Seal the gap securely. Further, the tightening ring 30 is in close contact with the inner periphery of the joint body 10 at two locations on the front end portion of the tapered surface 32 and the tapered contact surface 35 in a watertight manner. The gap with 30 is securely sealed. In addition, between the taper surface 32 and the inner periphery of the joint body 10, only the substantially first half portion of the taper surface 32 is in close contact with the rear taper surface 16c in a surface contact state, and the substantially second half portion of the taper surface 32 is the rear portion. It is separated from the tapered surface 16c. The biting portion 33c is positioned so as to correspond to a close contact region between the tapered surface 32 and the rear tapered surface 16c of the tightening portion 31, and is in contact with the outer periphery of the pipe P so as to bite.
[0047]
Further, when the tightening ring 30 is in a normal tightening state, the front end portion of the tightening portion 31 is a ring shape substantially parallel to the pipe insertion direction between the outer peripheral surface of the pipe P and the inner peripheral surface of the joint body 10. It is designed to be pinched. As a result, the tightening portion 31 comes into surface contact with the outer peripheral surface of the pipe P and the inner peripheral surface of the joint body 10, so that the tightening portion 31 is not buckled and the frictional resistance is increased. Loosening of the tightening ring 30 is prevented. In addition, since the tightening portion 31 has a band shape with a constant diameter, the close contact area between the tightening ring 30 and the pipe P becomes longer in the pipe insertion direction, and high sealing performance is ensured.
[0048]
Further, the male screw portion 12 is formed up to the front end of the extension portion 18, and the diameter of the extension portion 18 (particularly, the front end portion) is increased by the inclination of the tapered contact surface 35 as the fastening member 20 is screwed. The female screw portion 12 is deformed and pressed against the female screw portion 21 of the tightening member 20, and the crests and valleys of the screw are firmly bitten, so that the biting prevents the tightening member 20 from loosening. .
In addition, since it is the same as that of the said Embodiment 2 about the structure other than the above, the same code | symbol is attached | subjected about the same structure and description of a structure, an effect | action, and an effect is abbreviate | omitted.
[0049]
[Embodiment 4]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
In the pipe joint Jd of this embodiment, in the third embodiment, the inward protrusion 23, the guide surface 24, the escape hole 25 are provided in the tightening member 20, and the outward protrusion 34 is provided in the tightening ring 30, The fastening ring 30 is temporarily held on the fastening member 20. Since the other configuration is the same as that of the third embodiment, the same reference numeral is given to the same configuration, and the description of the structure, operation, and effect is omitted.
[0050]
[Embodiment 5]
Next, a fifth embodiment of the present invention will be described with reference to FIGS.
The pipe joint Je of this embodiment is provided with two fastening rings 40 and 50 in the front and back in the first embodiment. That is, each of the tightening rings 40 and 50 has thin cylindrical tightening portions 41 and 51 protruding forward, and the outer circumferences of the tightening portions 41 and 51 are tapered surfaces 42 and 52 (which is a constituent requirement of the present invention). Tightening means). Further, a tapered surface 43 (clamping means which is a constituent element of the present invention) is also formed on the inner periphery of the rear portion of the front tightening ring 40. Further, the rear tightening ring 50 is formed with outward projections 34 as in the case of the tightening ring 30 of the first embodiment, so that the rear tightening ring 50 is temporarily held with respect to the tightening member 20. It has become.
[0051]
In the normal tightening state, the rear tapered surface 16c of the joint body 10 and the tapered surface 42 of the front tightening ring 40 are in surface contact, and the tapered surface 43 of the front tightening ring 40 and the tapered surface 52 of the rear tightening ring Are brought into surface contact, and the front end portions of the tightening portions 41 and 51 of the tightening rings 40 and 50 are brought into contact with the outer periphery of the pipe P. As a result, the space between the pipe P and the tightening rings 40 and 50 is sealed, and the pipe P is locked in a retaining state, and the space between each of the tightening rings 40 and the joint body 10 and the tightening ring 40. , 50 are also sealed. Further, in the close contact region between the tapered surfaces 43 and 52 of the tightening rings 40 and 50, loosening in the front-rear direction is prevented by frictional resistance. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and descriptions of structures, operations, and effects are omitted.
[0052]
[Embodiment 6]
Next, a sixth embodiment of the present invention will be described with reference to FIG.
In the pipe joint Jf of the present embodiment, the circular spacer 60 that is continuous over the entire circumference is applied to the contact surface 14 of the front end face of the jig fitting portion 3 of the joint body 10 in the above-described fourth embodiment. The front end surface of the spacer 60 is a contact surface 61 that can contact the contact surface 28 of the fastening member 20. That is, the joint body 10 is provided with two contact surfaces, that is, a contact surface 14 formed directly on the joint body 10 and a contact surface 61 formed on the spacer 60 which is a separate component from the joint body 10. ing.
[0053]
In the connection process of the pipe P, the tightening ring 30 is in a normal tightening state before the contact surface 28 of the tightening member 20 contacts the contact surface 61 on the joint body 10 side, and then the tightening member 20. The normal tightening state by the tightening ring 30 is maintained until the abutting surface 28 of the tightening member 20 abuts against the abutting surface 61 of the joint body 10. In a state where the contact surfaces 28 and 61 are in contact with each other, the rear end surface of the spacer 60 (the surface opposite to the contact surface 61) contacts the contact surface 14 at the front end of the jig fitting portion 13.
[0054]
Further, when removing the pipe P once connected, the tightening member 20 is loosened, the tightening (biting) into the pipe P by the tightening ring 30 is eased, and the pipe P can be pulled forward in this state. Thereafter, when the pipe P is connected again, the fastening member 20 may be screwed so that the fastening ring 30 bites into the outer periphery of the pipe P. At this time, there is a concern that the fastening ring 30 and the pipe P are plastically deformed at the time of the first connection, so that the fastening of the fastening ring 30 may be loosened. In this case, the spacer 60 is previously attached to the joint body 10. Remove from. In this way, the screwing distance of the tightening member 20 is increased by the thickness dimension of the spacer 60, so that the tightening member 20 is moved until the contact surface 28 contacts the contact surface 14 of the jig fitting portion 13. When the screw is advanced, the tightening by the tightening ring 30 is surely performed. Thus, in the sixth embodiment, retightening when the pipe P is attached and detached is possible.
[0055]
Since the other configuration is the same as that of the fourth embodiment, the same reference numeral is given to the same configuration, and description of the structure, operation, and effect is omitted.
The spacer is not limited to a circular shape that is continuous over the entire circumference, and a C-shaped ring-shaped spacer 62 that is partially cut off in the circumferential direction may be used as shown in FIG. As shown in FIG. 11, a spacer 63 having a knob 64 protruding on the outer periphery can also be used.
[0056]
[Embodiment 7]
A seventh embodiment embodying the present invention will be described below with reference to FIG.
The pipe joint Jg of the present embodiment is provided with means for restricting the rotation of the tightening member in the pipe joint Ja of the first embodiment. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and descriptions of structures, operations, and effects are omitted.
A diameter expansion deforming portion 36 is formed on the rear end portion of the outer periphery of the tightening ring 30 so as to protrude over the entire periphery. The outer diameter of the enlarged diameter deforming portion 36 in a state before the tightening member 20 is tightened (a state in which the tightening ring 30 is not deformed) is set to be slightly smaller than the inner diameter of the accommodation hole 22 of the tightening member 20. .
[0057]
In a state where the connection work of the pipe P is completed, the diameter expansion deforming portion 36 of the tightening ring 30 undergoes a diameter expansion deformation along with the diameter contraction deformation of the tightening portion 31, and the inner periphery of the tightening member 20, that is, accommodation. It bites into the inner peripheral rear end of the hole 22 and the rear end side end face of the accommodation hole 22 while being plastically deformed. At this time, the inner periphery of the tightening member 20 also undergoes plastic deformation in an expanded shape. By the biting of the enlarged diameter deforming portion 36 with respect to the tightening member 20, the rotation of the tightening member 20, that is, the backward movement of the tightening member 20, is regulated. It is locked at a work completion position that is in close contact (surface contact) with the contact surface. The tightening member 20 is also restricted in rotation by static friction resulting from the close contact between the contact surfaces 14 and 28. Thus, the tightening member 20 is locked so as not to rotate, so that the tightening ring 30 is also locked to the pipe P in a proper tightening state.
[0058]
In the seventh embodiment, the enlarged diameter deforming portion 36 is formed only on the outer periphery of the rear end portion of the tightening ring 30, but the entire large diameter portion behind the tightening portion 31 in the tightening ring 30 is expanded and deformed. In this case, the entire outer periphery of the large diameter portion bites into the inner periphery of the accommodation hole 22 and is in close contact with the inner diameter.
[Embodiment 8]
Hereinafter, an eighth embodiment of the present invention will be described with reference to FIGS. 13 and 14. The pipe joint Jh of the eighth embodiment is provided with means for indicating that the locking and sealing by the tightening ring 30 are completed in the pipe joint Ja of the first embodiment. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and descriptions of structures, operations, and effects are omitted.
[0059]
The rear surface of the jig fitting portion 13 of the joint body 10 is an identification inclined surface 70 whose diameter increases toward the front (rightward in FIGS. 13 and 14). A rear end portion of the identification inclined surface 70 is formed with a constant diameter portion 71 and a locking projection 72 that protrudes radially outward adjacent to the rear of the constant diameter portion 71. A locking recess 73 having a diameter larger than that of the constant diameter portion 71 is formed in the inclined area in front of 71. An identification ring 74 having an end-like annular shape (substantially C-shaped) is fitted to the identification inclined surface 70. The identification ring 74 can be elastically expanded and deformed, and is always elastically contacted with the constant diameter portion 71 from the outer peripheral side and is displaced backward by the locking projection 72. Is held in a regulated state. The identification ring 74 may have a color different from that of the tightening member 20 and the joint body 10 so as to be easily distinguished from the tightening member 20 and the joint body 10.
[0060]
In the unlocked state (the state before the pipe P is connected) in which the fastening member 20 is moved rearward with respect to the joint body 10, the identification ring 74 is in elastic contact with the constant diameter portion 71. That is, it is held in the most contracted state. In this state, since the identification ring 74 is housed in the back of the recess in the shape of a groove formed between the jig fitting portion 13 and the fastening member 20, the identification ring 74 is externally provided. It is difficult to see. Further, the rear end surface of the identification ring 74 is in a position protruding rearward from the contact surface 14 of the joint body 10.
[0061]
In this state, when the pipe P is inserted, the tightening member 20 is rotated in the tightening direction and screwed forward, and the pipe P is tightened by the tightening ring 30, the front end surface of the tightening member 20 is identified. Push 74 forward. The discriminating ring 74 slides on the discriminating inclined surface 70 and gradually expands and deforms elastically in accordance with the inclination. When the tightening member 20 is sufficiently tightened to the position where the contact surfaces 14 and 28 are in contact with each other and the tightening of the pipe P by the tightening ring 30 is completed, the identification ring 74 is engaged with the locking recess 73. At the same time, it appears on substantially the same surface as the outer peripheral surface of the fastening member 20 and is visible from the outside.
[0062]
Thus, in a state where the tightening member 20 is not tightened (in a state where the lock and seal by the tightening ring 30 are released), the identification ring 74 is located behind the gap between the tightening member 20 and the jig fitting portion 13. In a locked state in which the pipe P is tightened by the tightening ring 30 in a locked state, the identification ring 74 is expanded in diameter so that it can be easily viewed from the outside. Therefore, whether or not the tightening operation (locking and sealing) of the tightening member 20 has been completed can be clearly determined according to the state of the identification ring 74.
[0063]
[Embodiment 9]
A ninth embodiment of the present invention will be described below with reference to FIGS. 15 and 16. The pipe joint Ji of the present embodiment is provided with two tightening rings 85F and 85R in the same manner as in the fifth embodiment, and includes a valve mechanism 80. Since the structure for tightening the pipe P is the same as that of the fifth embodiment, detailed description thereof will be omitted, and the valve mechanism 80 will be mainly described.
A cylindrical valve body 82 is provided on the inner periphery of the joint body 81 so as to be movable in the axial direction (front-rear direction). The front end of the valve rod 84 is screwed into the female screw hole 83 formed in the front end portion of the joint body 81. It is fixed as a result. The tubular valve body 82 has a tapered surface 86 on the inner periphery of the rear end portion, and this tapered surface 86 is in contact with the tapered surface 85Fa on the outer periphery of the first tightening ring 85F located on the front side. Further, an O-ring 87 is attached to the outer periphery of the front end portion of the tubular valve body 82, and when this O-ring 87 is in close contact with the inner periphery of the joint body 81, a gap between the tubular valve body 82 and the joint body 81 is formed. Sealed in a watertight manner. The tubular valve body 82 is urged by the valve closing spring 88 in a direction to press the tapered surface 86 of the cylindrical valve body 82 against the tapered surface 85Fa of the first fastening ring 85F. Moreover, the opening part of the front-end part of the cylindrical valve body 82 becomes the taper-shaped valve port 89 which is diameter-reduced toward the front.
[0064]
The outer periphery of the rear end portion of the valve rod 84 is a valve seat 90 having a tapered shape with a diameter reduced toward the front, and the taper gradient of the valve seat 90 is set to the same angle as the taper gradient of the valve port 89. Has been. In addition, an O-ring 91 is attached to the valve seat 90, and when the O-ring 91 is in close contact with the inner peripheral surface of the valve port 89, the space between the valve seat 90 and the valve port 89 is sealed in a watertight manner. It has become so. A plurality of through holes 92 are formed in the rear end portion of the joint body 81 on the outer peripheral side of the female screw hole 83 in the front-rear direction. The fitted pipe P and a mating piping member (not shown) screwed into the male threaded portion 93 at the front end of the joint body 81 are communicated with each other.
[0065]
In a state before the tightening member 20 is tightened, as shown in FIG. 15, the tubular valve body 82 is in a state in which its valve port 89 is brought into contact with the valve seat 90 by the biasing of the valve closing spring 88, that is, the valve. The mechanism 80 is held in a closed state. Therefore, the fluid does not flow between the pipe P and the counterpart piping member.
When the fastening member 20 is tightened from this state and screwed forward until the contact surfaces 14 and 28 come into contact with each other, both the fastening rings 85F and 85R are tapered surfaces 85Fb and 85Ra as described in the fifth embodiment. The diameter of the pipe P is reduced and tightened to the outer periphery of the pipe P. By this tightening, the pipe P is locked in a connection state in which backward movement is restricted, and each of the tightening rings 85F and 85R and the outer periphery of the pipe P are Between the taper surfaces 85Fb and 85Ra of the two tightening rings 85F and 85R, and between the taper surface 85Fa of the first tightening ring 85F and the taper surface 86 of the tubular valve body 82, watertight sealing is performed. It becomes a state. Furthermore, the tapered seal surface 82A formed at the front end of the tubular valve body 82 is in close contact with the tapered seal surface 81A formed on the inner periphery of the joint body 81 in a water-tight manner. The gap between the tubular valve body 82 and the joint body 81 is sealed in cooperation with the outer O-ring 87.
[0066]
Further, as the tightening member 20 is screwed, the tubular valve body 82 moves forward against the bias of the valve closing spring 88 by being pushed by both the tightening rings 85F and 85R. The inner periphery of the port 89 is separated from the valve seat 90. As a result, the valve mechanism 80 is automatically opened (see FIG. 16). When the tightening member 20 is loosened from this state, the tubular valve body 82 moves rearward by the bias of the valve closing spring 88, the inner periphery of the valve port 89 comes into contact with the valve seat 90, and the valve mechanism 80 is The valve is automatically closed.
[0067]
[Embodiment 10]
Hereinafter, a tenth embodiment of the present invention will be described with reference to FIGS. 17 and 18. The pipe joint Jj of the tenth embodiment has a different valve mechanism from the pipe joint Ji of the ninth embodiment. In addition, about the same structure as the said Embodiment 9, the same code | symbol is attached | subjected and description of a structure, an effect | action, and an effect is abbreviate | omitted.
The valve mechanism 100 of the tenth embodiment has the following configuration.
A valve port 103 having a diameter reduced toward the front is formed in front (back) of the pipe insertion region in the inner periphery of the joint main body 102, and a position in front of the jig fitting portion 104 on the outer periphery of the joint main body 102. A circumferential receiving portion 105 is formed so as to protrude, and an O-ring 106 is attached to the outer peripheral front end of the joint body 102. A cylindrical screw body 107 is mounted on the outer periphery of the front end portion of the joint body 102 so as to be capable of relative rotation and axial movement. The O-ring 106 of the joint body 102 is in close contact with the inner periphery of the screw body 107, whereby the gap between the inner periphery of the screw body 107 and the outer periphery of the joint body 102 is sealed in a watertight manner. . A female screw hole 109 is formed in the support wall 108 on the inner periphery of the screw body 107, and the front end portion of the valve rod 110 is screwed into the female screw hole 109.
[0068]
The outer periphery of the rear end of the valve stem 110 is a valve seat 111 having a tapered shape with a diameter reduced toward the front, and the taper gradient of the valve seat 111 is set to the same angle as the taper gradient of the valve port 103. Has been. In addition, an O-ring 112 is attached to the valve seat 111, and when the O-ring 112 is in close contact with the inner peripheral surface of the valve port 103, the space between the valve seat 111 and the valve port 103 is sealed in a watertight manner. It has become so. The support wall 108 is formed with a plurality of through holes 114 penetrating in the front-rear direction on the outer peripheral side of the female screw hole 109, and the pipe fitted in the joint body 102 through the through hole 114. P and a mating piping member (not shown) screwed into the female thread portion 115 at the front end of the joint body 102 are communicated with each other. In addition, a male screw portion 116 is formed on the outer periphery of the screw body 107, and a valve opening / closing nut 117 is screwed to the male screw portion 116. The spring part opening / closing nut 117 is restrained from moving backward with respect to the joint main body 102 by being engaged with the receiving part 105 from the rear side with the locking part 118 at the rear end thereof, and the screw body 107 and the receiving part. The forward play is restricted by the urging of the play restricting spring 119 mounted between the head and the hand 105. The valve opening / closing nut 117 can be rotated relative to the joint body 102.
[0069]
In the state where the screwing body 107 is located at the most forward position, the valve mechanism 111 is closed by the valve seat 111 integral with the screwing body 107 coming into contact with the inner periphery of the valve port 103 as shown in FIG. Has been. From this state, when the screw body 107 is screwed backward by rotating the valve opening / closing nut 117 and the screw member 107 relative to each other, the valve seat 111 that has moved backward together with the screw member 107 moves to the valve port 103. The valve mechanism 100 is opened away from the inner periphery as shown in FIG. In this valve open state, the taper-shaped seal surface 102A formed at the front end of the joint body 102 is in close contact with the taper-shaped seal surface 107A formed on the inner periphery of the screw body 107 in a watertight manner. The gap between the joint main body 102 and the screwed body 107 is sealed in cooperation with the O-ring 106 on the outer periphery.
[0070]
The valve mechanism 100 described above is opened and closed independently of the connection of the pipe P to the pipe joint 80. That is, the valve mechanism 100 can be freely opened and closed even when the contact surfaces 14 and 28 are in close contact with each other and the pipe P is completely tightened by the tightening rings 85F and 85R.
[0071]
[Embodiment 11]
Hereinafter, an eleventh embodiment of the present invention will be described with reference to FIGS. 19 and 20. In the pipe joint Jj of the eleventh embodiment, in the first embodiment, the rear end surface of the joint main body 10 is connected to the pipe P in the insertion / extraction direction (= the screwing direction of the fastening member 20, and is accompanied by the fastening of the fastening ring 30. And a flat surface 10a perpendicular to the movement direction), and an inner peripheral edge of the flat surface 10a, that is, a peripheral edge serving as a boundary with the rear taper surface 16c is an edge-shaped angular edge 10b. A tapered contact surface 35 that is opposed to the flat surface 10a and the corner edge portion 10b and has a larger inclination angle than the tapered surface 32 of the tightening portion 31 is formed.
[0072]
Also in the pipe joint Jj of the eleventh embodiment, as in the first embodiment, in the process in which the tightening member 20 is screwed, a normal tightening state is obtained before the contact surfaces 14 and 28 come into contact with each other. The normal tightening state is maintained until the contact surfaces 14 and 28 come into contact with each other and the connection of the pipe P is completed. That is, when the screwing of the tightening member 20 is started, the front end portion of the tightening portion 31 first comes into contact with the rear tapered surface 16c of the joint body 10 as shown in FIG. As the tightening member 20 advances, the contact area (surface contact area) between the rear taper surface 16c and the taper surface 32 of the tightening portion 31 gradually expands rearward, and the diameter of the tightening portion 31 is reduced. Advances. And just before the contact surfaces 14 and 28 contact each other, the tapered contact surface 35 of the tightening ring 30 has an angular edge with respect to the corner edge portion 10b at the boundary between the flat surface 10a and the rear tapered surface 16c. By abutting so as to bite in the portion 10b, the abutting portion becomes a watertight state, and the tightening ring 30 reaches a regular tightening state. From this point, when the screwing of the tightening member 20 is further advanced until reaching the final position where the contact surfaces 14 and 28 contact, the corner edge portion 10b seems to bite into the tapered contact surface 35 during that time. Thus, the flat surface 10a and the tapered contact surface 35 are in close contact (surface contact) in a wide range.
[0073]
In a normal tightening state, the tightening ring 30 tightens the pipe P at two positions before and after the front end portion of the tightening portion 31 and the biting portion 33c to securely lock the pipe P, and between the pipe P and the tightening ring 30. Seal the gap securely. Further, the tightening ring 30 is in close contact with the inner periphery of the joint body 10 at almost the entire area of the tapered surface 32 and at two locations before and after the tapered contact surface 35, so that the joint body 10 and the tightening ring The gap with 30 is securely sealed. Note that the front and rear contact portions of the fastening ring 30 and the pipe P are located within a wide contact area (surface contact) between the rear tapered surface 33c and the tapered surface 32.
In addition, since it is the same as that of the said Embodiment 1 about the structure other than the above, the same code | symbol is attached | subjected about the same structure and description of a structure, an effect | action, and an effect is abbreviate | omitted.
[0074]
[Embodiment 12]
Next, a twelfth embodiment embodying the present invention will be described with reference to FIGS. The pipe joint Jl of the present embodiment is similar to the fifth embodiment having the two front and rear tightening rings 40 and 50, and the rear end surface of the joint body 10 is inserted in and removed from the pipe P (= in the screwing direction of the tightening member 20). And a flat surface 10a perpendicular to the direction of movement of the tightening ring 40), and an inner peripheral edge of the flat surface 10a, that is, a peripheral edge serving as a boundary with the rear taper surface 16c is an edge-shaped angular edge 10b. In addition, a tapered contact surface 45 that is opposed to the flat surface 10a and the corner edge portion 10b and has a larger inclination angle than the tapered surface 42 of the tightening portion 41 is formed on the front tightening ring 40.
[0075]
Also in the pipe joint Jl of the twelfth embodiment, as in the fifth embodiment, in the process in which the tightening member 20 is screwed, the tightening member 20 is brought into a regular tightening state before the contact surfaces 14 and 28 come into contact with each other. The normal tightening state is maintained until the contact surfaces 14 and 28 come into contact with each other and the connection of the pipe P is completed. That is, when the screwing of the tightening member 20 is started, as shown in FIG. 21, the front end portion of the tightening portion 41 of the front tightening ring 40 comes into contact with the rear tapered surface 16c of the joint body 10, and the rear portion The front end portion of the tightening portion 51 of the side tightening ring 50 abuts on the tapered surface 43 on the inner periphery of the front tightening ring 40. As the tightening member 20 advances, the contact region (surface contact region) between the rear taper surface 16c and the taper surface 42 and the contact region (surface contact region) between the taper surface 43 and the taper surface 52 are respectively reduced. As it expands rearward, the diameter-reducing deformation of the tightening portions 41 and 51 progresses.
[0076]
And just before the contact surfaces 14 and 28 contact each other, the tapered contact surface 45 of the tightening ring 40 has an angular edge with respect to the corner edge portion 10b at the boundary between the flat surface 10a and the rear tapered surface 16c. By abutting so as to bite in the portion 10b, the abutting portion becomes a watertight state, and the tightening ring 40 reaches a normal tightening state. Almost simultaneously with or before and after the front side tightening ring 40, the rear side tightening ring 50 also reaches a normal tightening state. From this point, when the screwing of the fastening member 20 is further advanced until reaching the final position where the contact surfaces 14 and 28 come into contact with each other, the corner edge 10b is in contact with the tapered contact of the front fastening ring 40. Plastic deformation is performed so as to bite into the surface 45, and the flat surface 10a and the tapered contact surface 45 are in close contact with each other over a wide range.
[0077]
In a normal tightening state, the tightening ring 30 tightens the pipes P at two positions before and after the front end of the tightening portion 41 of the front tightening ring 40 and the front end of the tightening portion 51 of the rear tightening ring 50. The pipe P is securely locked and the gap between the pipe P and the tightening ring 30 is reliably sealed. In addition, the front-side tightening ring 40 is tightly attached to the joint body 10 by being in close contact with the inner periphery of the joint body 10 at almost the entire area of the tapered surface 42 and at two locations before and after the tapered contact surface 45. The gap with the attached ring 40 is securely sealed. The front and rear tightening rings 40 and 50 are also in a watertight state due to the close contact between the tapered surface 43 and the tapered surface 52. The abutting portion between the rear side tightening ring 50 and the pipe P is located behind the contact area between the front side tightening ring 40 and the joint body 10. Further, the close contact region between the front side tightening ring 40 and the pipe P is located within a wide contact region between the rear tapered surface 33 c and the tapered surface 42. In addition, since it is the same as that of the said Embodiment 5 about the structure except the above, the same code | symbol is attached | subjected about the same structure, and description of a structure, an effect | action, and an effect is abbreviate | omitted.
[0078]
[Other Embodiments]
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the first to twelfth embodiments described above, the tapered surface of the diameter reducing means is provided on both the joint body and the tightening ring. However, according to the present invention, the tapered surface is formed of the tightening member and the tightening ring. You may provide only in any one.
(2) Although both the tightening ring and the pipe are made of copper in the first to twelfth embodiments, the present invention can be applied to a case where the metal is other than copper.
(3) In the first to twelfth embodiments, the joint body and the fastening member are made of brass. However, the present invention can also be applied to a case of a metal other than brass.
[0079]
(4) In Embodiments 1 to 6 and 8 to 12 described above, a radial gap is provided between the tightening ring and the tightening member in the normal tightening state. The structure for restricting the rotation of the tightening member according to the seventh embodiment can be applied to the first to sixth and eighth to twelfth embodiments.
(5) In Embodiments 1 to 4 and 6 to 11, one clamping ring bites into the pipe at two locations. However, according to the present invention, the clamping rings bite into the pipe one by one. Or you may make it bite into a pipe at three or more places.
(6) In Embodiments 3, 4, 7 to 10, the tightening portion of the front end portion of the tightening ring is in close contact with the pipe in a band shape, but according to the present invention, the front end portion of the tightening ring is You may make it bite in a wedge shape with respect to a pipe.
[0080]
(7) In the fifth, ninth, tenth and twelfth embodiments, two tightening rings are provided. However, according to the present invention, three or more tightening rings may be provided.
(8) In Embodiments 5 and 12, each of the front and rear tightening rings bites into the pipe at one location, but according to the present invention, each clamping ring bites into the pipe at two or more locations. May be.
(9) In the sixth embodiment, only one spacer is provided. However, according to the present invention, a plurality of spacers are attached to the joint body in advance, and a plurality of pipes P can be attached and detached by removing the spacers one by one. Can be performed once.
[0081]
(10) The configuration that enables the additional tightening by the spacer of the sixth embodiment can be applied to the first to fifth and seventh to twelfth embodiments.
(11) According to the present invention, the structure provided with the identification means for indicating that the locking and sealing by the tightening ring of the eighth embodiment is completed can be applied to the first to seventh, ninth and twelfth embodiments.
(12) According to the present invention, the valve mechanisms of the ninth and tenth embodiments can be applied to the first to eighth, eleventh and twelfth embodiments (in the case of one or a plurality of tightening rings).
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view showing a normal tightening state in Embodiment 1. FIG.
FIG. 2 is a cross-sectional view showing a state where a pipe is inserted shallowly in the first embodiment.
FIG. 3 is an enlarged cross-sectional view showing a normal tightening state in the second embodiment.
FIG. 4 is an enlarged cross-sectional view showing a normal tightening state in the third embodiment.
FIG. 5 is a sectional view showing a state where a pipe is inserted shallowly in the third embodiment.
FIG. 6 is an enlarged cross-sectional view showing a normal tightening state in the fourth embodiment.
FIG. 7 is an enlarged sectional view showing a normal tightening state in the fifth embodiment.
FIG. 8 is a cross-sectional view showing a state where a pipe is inserted shallowly in the fifth embodiment.
FIG. 9 is an enlarged sectional view showing a normal tightening state in the sixth embodiment.
FIG. 10 is a perspective view showing a modification of the spacer according to the sixth embodiment.
FIG. 11 is a perspective view showing a modified example of the spacer according to the sixth embodiment.
FIG. 12 is an enlarged sectional view showing a regular tightening state in the seventh embodiment.
13 is a cross-sectional view showing a state where a pipe is inserted shallowly in Embodiment 8. FIG.
FIG. 14 is an enlarged sectional view showing a normal tightening state in the eighth embodiment.
FIG. 15 is a sectional view showing a state before connecting a pipe in the ninth embodiment.
FIG. 16 is a sectional view showing a state where pipes are connected in the ninth embodiment.
FIG. 17 is a cross-sectional view showing a state where the valve mechanism is closed in the tenth embodiment.
18 is a sectional view showing a state in which the valve mechanism is opened in Embodiment 10. FIG.
FIG. 19 is a cross-sectional view showing a state where the pipe is inserted shallowly in the eleventh embodiment.
FIG. 20 is an enlarged sectional view showing a normal tightening state in the eleventh embodiment.
FIG. 21 is a sectional view showing a state where a pipe is inserted shallowly in Embodiment 12.
FIG. 22 is an enlarged sectional view showing a normal tightening state in the twelfth embodiment.
[Explanation of symbols]
P ... pipe
Ja: Pipe fitting
10 ... Fitting body
14: Contact surface
16c ... rear taper surface (diameter reducing means)
20 ... Fastening member
28: Contact surface
30 ... Tightening ring
31 ... Tightening part
32 ... Tapered surface (diameter reducing means)
Jb, Jc, Jd, Je, Jf, Jg, Jh, Ji, Jj, Jk, Kl ... Fitting
40, 50 ... Tightening ring
41, 51 ... Tightening part
42, 43, 52 ... Tapered surface
61: Contact surface

Claims (10)

金属製のパイプの挿入を可能とした筒状の継手本体と、
この継手本体に螺合される筒状の締付部材と、
前記締付部材内に収容され、前記継手本体内に挿入された前記パイプを囲むような筒状をなす金属製の締付リングと、
パイプ挿入方向に対して傾斜したテーパ面を有し、前記締付部材の螺進に伴い前記締付リングを前記継手本体の内周に対し水密状に密着させつつ縮径方向へ塑性変形させることで、その締付リングが前記パイプの外周に対し遊動規制状態に食い込むとともに水密状態に密着する形態で締め付けた状態である正規の締付け状態に至るようにした縮径手段とを備えてなり、
前記継手本体と前記締付部材には、前記締付リングを縮径変形させる締付け方向へ前記締付部材が螺進するのに伴って接近して当接状態に至ることが可能な一対の当接面が設けられており、
前記締付部材側の前記当接面は、前記締付部材が締付け方向へ螺進する過程において前記締付リングが前記正規の締付け状態に至った時点で前記継手本体側の前記当接面から離間する位置に形成され、
前記継手本体は、前記締付部材が締付け方向へ螺進する過程において前記締付リングが前記正規の締付け状態に至った時点で、前記継手本体の内周と前記パイプの外周との間に前記締付リングが潜り込むことを許容する隙間が形成される形態に形成されており、
前記締付部材が締付け方向へ螺進する過程では、前記締付リングが前記正規の締付け状態に至ってから、前記締付部材の螺進が前記一対の当接面が突き当たる位置まで進む間は、前記締付リングが前記継手本体の内周と前記パイプの外周に潜り込むことで、前記締付リングの前記正規の締付け状態が保たれるようになっており、
前記締付部材の内周には、内側へ円形に突出する内向き突部が形成され、
前記締付リングには、外径が前記内向き突部の内径よりも大きい外向き突部が形成され、
前記内向き突部と前記外向き突部が係止することで、前記締付リングが前記締付部材に対して収容されるとともに離脱規制された状態に保持されると共に、
前記締付リングには、前記締付部材が締付け方向へ螺進するときに押圧する後端面が形成されており、
前記外向き突部が、前記締付リングの後端面からの延出部の外周から突出する形態とされ、
前記内向き突部が前記締付リングの後端面と前記外向き突部との間で挟まれた形態で、前記締付リングが前記締付部材に保持されていることを特徴とする管継手。A cylindrical joint body that allows insertion of a metal pipe;
A cylindrical fastening member screwed into the joint body;
A metal clamping ring that is housed in the clamping member and has a cylindrical shape surrounding the pipe inserted into the joint body;
A taper surface inclined with respect to the pipe insertion direction, and plastically deforming in the diameter-reducing direction while closely fitting the fastening ring to the inner periphery of the joint body as the fastening member is screwed. The tightening ring is provided with a diameter reducing means that reaches a regular tightening state that is a state of tightening in a form that tightly adheres to a watertight state while biting into an idle state with respect to the outer periphery of the pipe,
The joint body and the tightening member have a pair of contacts that can come into contact with each other as the tightening member is screwed in the tightening direction to reduce the diameter of the tightening ring. There is a contact surface,
The contact surface on the side of the tightening member is separated from the contact surface on the side of the joint body when the tightening ring reaches the normal tightening state in the process of screwing the tightening member in the tightening direction. Formed at spaced apart positions,
The joint main body is formed between the inner periphery of the joint main body and the outer periphery of the pipe when the tightening ring reaches the normal tightening state in the process in which the tightening member is screwed in the tightening direction. It is formed in a form that forms a gap that allows the clamping ring to sink,
In the process in which the tightening member is screwed in the tightening direction, the screw ring of the tightening member advances to a position where the pair of contact surfaces abut after the tightening ring reaches the normal tightening state. The tightening ring is embedded in the inner periphery of the joint body and the outer periphery of the pipe, so that the regular tightening state of the tightening ring is maintained.
On the inner periphery of the tightening member, an inward protrusion that protrudes circularly inward is formed,
The fastening ring is formed with an outward projection whose outer diameter is larger than the inner diameter of the inward projection,
As the inward protrusion and the outward protrusion are locked, the tightening ring is housed in the tightening member and held in a state of being restricted , and
The clamping ring has a rear end surface that is pressed when the clamping member is screwed in the clamping direction,
The outward projecting portion is configured to project from the outer periphery of the extending portion from the rear end surface of the clamping ring,
The pipe joint , wherein the inward projecting portion is sandwiched between a rear end surface of the tightening ring and the outward projecting portion, and the tightening ring is held by the tightening member. . 前記締付リングには、正規の締付け状態で前記継手本体の内周に対しパイプ挿入方向に離間した２カ所で当接するテーパ面とテーパ状当接面とが形成されているとともに、正規の締付け状態で前記パイプの外周に対しパイプ挿入方向に離間した２カ所で当接する締付部と食い込み部とが形成されていることを特徴とする請求項１に記載の管継手。 The tightening ring is formed with a tapered surface and a tapered contact surface that are in contact with the inner periphery of the joint body at two locations spaced apart in the pipe insertion direction in a properly tightened state. 2. The pipe joint according to claim 1, wherein a tightening portion and a biting portion that are in contact with each other at two locations spaced apart in the pipe insertion direction with respect to the outer periphery of the pipe in a state are formed . 前記締付リングの一方の端部が前記パイプに対する締付部とされ、
その締付部が前記縮径手段によって縮径させられるのに伴ってその締付リングの他方の端部側が拡径変形を生じるようになっており、
前記当接面同士が突き当たる正規の締付け状態では、前記拡径変形部が前記締付部材の内面に対して食い込むことで、その締付部材の回転動作が規制される構成としたことを特徴とする請求項１又は請求項２に記載の管継手。 One end of the clamping ring is a clamping part for the pipe,
As the tightening portion is reduced in diameter by the diameter reducing means, the other end side of the tightening ring is subjected to diameter expansion deformation,
In a regular tightening state where the contact surfaces abut against each other, the diameter-enlarged deformed portion bites into the inner surface of the tightening member, so that the rotation operation of the tightening member is restricted. The pipe joint according to claim 1 or 2. 前記継手本体の内周には、前記パイプの挿入方向先端外周縁が当接可能なテーパ状の前止まり面を形成したことを特徴とする請求項１〜３のいずれか一項に記載の管継手。 The pipe according to any one of claims 1 to 3 , wherein a tapered front stop surface on which an outer peripheral edge of the pipe in the insertion direction is abutted is formed on an inner periphery of the joint body. Fittings. 前記縮径手段を構成する前記継手本体側のテーパ面の傾斜角度と前記締付リング側のテーパ面の傾斜角度を互いに異なる角度としたことを特徴とする請求項１〜４のいずれか一項に記載の管継手。 5. The inclination angle of the tapered surface on the joint body side constituting the diameter reducing means and the inclination angle of the tapered surface on the fastening ring side are different from each other. The pipe joint described in 1. 前記締付リングには、縮径変形可能な締付け部が形成されているとともに、前記締付け部に、前記締付リング側のテーパ面が形成されており、
前記締付リングが正規の締付け状態となったときには、前記締付け部が、縮径変形することで、前記継手本体側のテーパ面に対して密着する構成としたことを特徴とする請求項５記載の管継手。 The tightening ring is formed with a tightening portion that can be deformed in a reduced diameter, and the tightening portion is formed with a tapered surface on the tightening ring side,
6. The structure according to claim 5 , wherein when the tightening ring is in a normal tightening state, the tightening portion is configured to be in close contact with the tapered surface on the joint body side by deforming to a reduced diameter. Pipe fittings. 前記締付リングには、肉薄状をなすとともに縮径変形可能な形態の締付け部が形成されており、
前記締付リングが正規の締付け状態になったときに、前記締付け部が、縮径変形することで、前記パイプの外周面と前記継手本体の内周面との間でパイプ挿入方向と概ね平行なリング状をなして挟み付けられる構成としたことを特徴とする請求項１〜６のいずれか一項に記載の管継手。 The tightening ring is formed with a tightening portion that is thin and deformable to a reduced diameter.
When the tightening ring is in a normal tightening state, the tightening portion is deformed in a reduced diameter so that the pipe insertion direction is approximately parallel to the pipe outer peripheral surface and the inner peripheral surface of the joint body. The pipe joint according to any one of claims 1 to 6, wherein the pipe joint is configured to be sandwiched in a ring shape . 前記継手本体側の前記縮径手段と前記締付リング側の前記縮径手段は、いずれも、傾斜角度が互いに異なり且つパイプ挿入方向に並ぶ複数のテーパ面によって構成されていることを特徴とする請求項１〜７のいずれか一項に記載の管継手。 The diameter reducing means on the joint body side and the diameter reducing means on the clamping ring side are both configured by a plurality of tapered surfaces having different inclination angles and arranged in the pipe insertion direction. The pipe joint according to any one of claims 1 to 7 . 前記継手本体には、前記締付部材に対しパイプ締付時における螺進方向先方に対応するように識別用傾斜面が形成され、
この識別用傾斜面上には弾性的に拡径変形可能な識別リングが摺接可能に配され、
前記締付部材の螺進動作が進むのに伴い、その締付部材が前記識別リングを軸方向に押して前記識別用傾斜面上で摺接させつつ拡径変形させる構成としたことを特徴とする請求項１〜８のいずれか一項に記載の管継手。 In the joint body, an identification inclined surface is formed so as to correspond to the forward direction in the screwing direction at the time of pipe tightening with respect to the tightening member,
An identification ring that can be elastically expanded and deformed is arranged on the inclined surface for identification so as to be slidable,
As the tightening member advances, the tightening member pushes the identification ring in the axial direction so as to be expanded in diameter while sliding on the identification inclined surface. The pipe joint according to any one of claims 1 to 8 . 前記継手本体の内部には、その継手本体内の流路を開閉するバルブ機構が設けられていることを特徴とする請求項１〜９のいずれか一項に記載の管継手。 The pipe joint according to any one of claims 1 to 9, wherein a valve mechanism for opening and closing a flow path in the joint body is provided inside the joint body .
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US10695810B2 (en) * 2015-02-09 2020-06-30 Toshiba Mitsubishi-Electric Industrial Systems Corporation Descaling system, control device of the descaling system, and method for controlling the descaling system
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