JP3656752B2

JP3656752B2 - Tube material fittings

Info

Publication number: JP3656752B2
Application number: JP2002150105A
Authority: JP
Inventors: 博詩水越
Original assignee: Flowell Corp
Current assignee: Flowell Corp
Priority date: 2002-05-24
Filing date: 2002-05-24
Publication date: 2005-06-08
Anticipated expiration: 2022-05-24
Also published as: JP2003343774A

Description

【０００１】
【発明の属する技術分野】
本発明は、ナット部材の雌ねじ孔内に差し込まれたチューブ材の一端部を継手本体に外嵌し、前記ナット部材の雌ねじを継手本体の雄ねじに締め込むことで、チューブ材の一端部を支持するようにしたチューブ材の継手に関する。特に、本発明は、高密度半導体チップの製造現場におけるクリーンルーム内で用いる純水洗浄液、その他薬液等の流管路を司るチューブ材の樹脂継手に関する。
【０００２】
【従来の技術】
従来のチューブ材の継手としては、例えば、特開平７−２４３５６４号公報に開示されたものがある。
【０００３】
すなわち、ナットを継手本体に締め込むときに、樹脂製スペーサーの両端面が継手本体とナットとに接触して、そのスペーサーを指で回して回転不能になるときをナットの締め込み終了位置とし、レンチ等の締め付け工具で締め込み終了位置を過ぎてナットを回し過ぎてもナットは樹脂製スペーサーを押圧して変形させるため、ねじ部に過度の応力は発生せず、継手本体を破損させることなく、ナットの締め込み作業を終了することができるものである。
【０００４】
また、同公報には、樹脂製スペーサーの両端面がそれぞれ継手本体面、ナット端面と接触すると、樹脂製スペーサーの両端面に作用する摩擦トルク差により、樹脂製スペーサーがナットと共回りし始め、樹脂製スペーサーの外形状の回転方向の移動により作業者が容易に目視できることで、ナットの締め込みを終了することができるものが開示されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、このような従来のチューブ材の継手では、ナットの締め込みの最終段階では、ナットを少しずつ締め込む毎に、樹脂製スペーサーを指で回して回転するか否かを確かめなければならず、ナットの締め込み作業が煩わしく、作業性が良くないという問題点がある。
また、ナット側から樹脂製スペーサーに作用する摩擦トルクが、継手本体側から樹脂製スペーサーに作用する摩擦トルクより大きければ、樹脂製スペーサーとナットとが共回りし始めることで、ナットの締め込みを終了することができるが、反対に、ナット側から樹脂製スペーサーに作用する摩擦トルクが、継手本体側から樹脂製スペーサーに作用する摩擦トルクより小さければ、ナットの締め込みの最終段階で、樹脂製スペーサーとナットとが必ず共回りするとは限らず、そのため、ナットの締め込み不足や、締め込み過ぎる場合があって、不具合を生じ、特に樹脂継手の場合には金属継手と異なり、ナットを締め込むだけナットが締まってしまい、ナットの締め込み過ぎの場合には継手本体を破損させる可能性があるという問題もある。
【０００６】
本発明は、このような従来の技術が有する問題点に着目してなされたもので、ナット部材の締め込みの最終段階で、ナット部材とコントロールリングとを確実に共回りさせることで、ナット部材の適正な初期締め込み位置を決定することができ、ナットの締め込み作業性を向上することができるとともに、継手本体の破損を防止することができるチューブ材の継手を提供することを目的としている。
【０００７】
【課題を解決するための手段】
かかる目的を達成するための本発明の要旨とするところは、次の各項の発明に存する。
［１］ナット部材（２０）の雌ねじ孔（２１）内に差し込まれたチューブ材（Ｔ）の一端部を継手本体（１０）に外嵌し、前記ナット部材（２０）の雌ねじを継手本体（１０）の雄ねじ（１３）に締め込むことで、チューブ材（Ｔ）の一端部を支持するようにしたチューブ材（Ｔ）の継手において、
前記継手本体（１０）の雄ねじ（１３）に外嵌していて、前記ナット部材（２０）の締め込み時に、前記継手本体（１０）の雄ねじ（１３）の奥側に形成された円周形状のフランジであるストッパ部（１７）と前記ナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）とにより挟まれることで、前記ナット部材（２０）の締め込み強度を調整可能な合成樹脂製のコントロールリング（３０）を備え、
前記コントロールリング（３０）は、前記ナット部材（２０）の締め込み時に、前記ナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）に対し接触し、該周縁部（２５）の円周方向に沿って形成される第１端面部（３２）と、前記継手本体（１０）のストッパ部（１７）と接触しない段部（３５）を間にして該第１端面部（３２）より小径になるよう形成され、該ストッパ部（１７）に対し接触し、該ストッパ部（１７）より小径になるよう該ストッパ部（１７）の円周方向に沿って形成される第２端面部（３４）とを有し、前記コントロールリング（３０）の内周面（３７）は、前記継手本体（１０）の雄ねじ（１３）およびその首部（１３ａ）とにそれぞれ外嵌し、
前記第１端面部（３２）の直径を前記第２端面部（３４）の直径より大きくなるように形成していること、および前記段部（３５）があることにより前記第１端面部（３２）の幅を前記第２端面部（３４）の幅よりも広くすることによって、前記第１端面部（３２）が前記雌ねじ孔（２１）の周縁部（２５）に対し接触する接触面積を前記第２端面部（３４）が前記ストッパ部（１７）に対し接触する接触面積よりも大きくし、
前記接触面積の大小関係により、前記第１端面部（３２）は、該第１端面部（３２）と前記雌ねじ孔（２１）の周縁部（２５）との間の摩擦係数を、前記第２端面部（３４）と前記ストッパ部（１７）との間の摩擦係数より大きくすることで、前記ナット部材（２０）の締め込み時に、前記ナット部材（２０）と前記コントロールリング（３０）とが共回りするように形成され、該コントロールリング（３０）の共回りを確認することで適正な締め込み強度を得られるよう構成した
ことを特徴とするチューブ材（Ｔ）の継手。
【０００９】
［２］ナット部材（２０）の雌ねじ孔（２１）内に差し込まれたチューブ材（Ｔ）の一端部を継手本体（１０）に外嵌し、前記ナット部材（２０）の雌ねじを継手本体（１０）の雄ねじ（１３）に締め込むことで、チューブ材（Ｔ）の一端部を支持するようにしたチューブ材（Ｔ）の継手において、
前記継手本体（１０）の雄ねじ（１３）に外嵌していて、前記ナット部材（２０）の締め込み時に、前記継手本体（１０）の雄ねじ（１３）の奥側に形成された円周形状のフランジであるストッパ部（１７）と前記ナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）とにより挟まれることで、前記ナット部材（２０）の締め込み強度を調整可能な合成樹脂製のコントロールリング（３０）を備え、
前記コントロールリング（３０）は、前記ナット部材（２０）の締め込み時に、前記ナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）に対し接触し、該周縁部（２５）の円周方向に沿って形成される第１端面部（３２）と、前記継手本体（１０）のストッパ部（１７）と接触しない段部（３５）を間にして該第１端面部（３２）より小径になるよう形成され、該ストッパ部（１７）に対し接触し、該ストッパ部（１７）より小径になるよう該ストッパ部（１７）の円周方向に沿って形成される第２端面部（３４）とを有し、前記コントロールリング（３０）の内周面（３７）は、前記継手本体（１０）の雄ねじ（１３）およびその首部（１３ａ）とにそれぞれ外嵌し、
前記第１端面部（３２）の直径を前記第２端面部（３４）の直径より大きくなるように形成していること、および前記段部（３５）があることにより前記第１端面部（３２）の幅を前記第２端面部（３４）の幅よりも広くすることによって、前記第１端面部（３２）が前記雌ねじ孔（２１）の周縁部（２５）に対し接触する接触面積を前記第２端面部（３４）が前記ストッパ部（１７）に対し接触する接触面積よりも大きくし、
前記接触面積の大小関係により、前記ナット部材（２０）の締め込み時に、前記雌ねじ孔（２１）の周縁部（２５）から受ける摩擦トルクを前記ストッパ部（１７）から受ける摩擦トルクより大きくすることで、前記ナット部材（２０）と前記コントロールリング（３０）とが共回りするように形成され、
前記コントロールリング（３０）の外周縁（３８）には、該外周縁（３８）の周方向に所定の間隔で目印部（３６）が連設され、該コントロールリング（３０）の共回りを目視確認することで適正な締め込み強度を得られるよう構成した
ことを特徴とするチューブ材（Ｔ）の継手。
【００１１】
［３］前記第１端面部（３２）は、前記雌ねじ孔（２１）の周縁部（２５）の円周方向に沿って形成され、
前記第２端面部（３４）は、前記ストッパ部（１７）の円周方向に沿って形成され、
前記第１端面部（３２）は、該第１端面部（３２）が前記雌ねじ孔（２１）の周縁部（２５）から受ける第１反力と前記コントロールリング（３０）の中心から前記第１反力を受ける部分までの距離との積の総和が、前記第２端面部（３４）が前記ストッパ（１７）に接する第２反力と前記コントロールリング（３０）の中心から前記第２反力を受ける部分までの距離との積の総和より大きくなるように形成されている
ことを特徴とする［１］または［２］に記載のチューブ材（Ｔ）の継手。
【００１２】
［４］前記コントロールリング（３０）の外周縁（３８）は、該外周縁（３８）の径が前記ナット部材（２０）の外径より大きくなるように形成され、
前記目印部（３６）は、前記コントロールリング（３０）の外周縁（３８）に形成された切欠き（３６）である
ことを特徴とする［２］に記載のチューブ材（Ｔ）の継手。
【００１４】
次に本発明の作用を説明する。
ナット部材（２０）の雌ねじ孔（２１）内にチューブ材（Ｔ）の一端部を差し込み、そのチューブ材（Ｔ）の一端部を継手本体（１０）に外嵌し、ナット部材（２０）の雌ねじを継手本体（１０）の雄ねじ（１３）に締め込むことで、チューブ材（Ｔ）の一端部を支持するようになっている。また、コントロールリング（３０）は継手本体（１０）の雄ねじ（１３）に外嵌しておく。
【００１５】
ナット部材（２０）を締め込んでいくと、コントロールリング（３０）は継手本体（１０）のストッパ部（１７）とナット部材（２０）の雌ねじ孔（２１）の孔周縁とにより挟まれるようになり、ナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）に対しコントロールリング（３０）の第１端面部（３２）が接触し、継手本体（１０）のストッパ部（１７）に対しコントロールリング（３０）の第２端面部（３４）が接触する。
【００１６】
このナット部材（２０）の締め込み時に、第１端面部（３２）が雌ねじ孔（２１）の周縁部（２５）から受ける摩擦トルクは、第２端面部（３４）がストッパ部（１７）から受ける摩擦トルクより大きくなるように、第１端面部（３２）および第２端面部（３４）がそれぞれ形成されているので、ナット部材（２０）とコントロールリング（３０）とが共回りするようになる。この共回りは、ナット部材（２０）の締め込み強度が適正な状態になったときに発生する現象であり、その共回りの状態を確認して、ナット部材（２０）の締め込み作業を終了すれば、ナット部材（２０）の適正な初期締め込み位置を決定することができ、ナット部材（２０）の締め込み作業を簡単かつ確実に行うことができ、ナット部材（２０）の締め込み不足や締め込み過ぎによる不具合を防止することができ、特に、締め込み過ぎによる継手本体（１０）の損傷を防止することができる。
【００１７】
具体的には、第１端面部（３２）が雌ねじ孔（２１）の周縁部（２５）の円周方向に沿って形成され、第２端面部（３４）がストッパ部（１７）の円周方向に沿って形成されている場合に、第１端面部（３２）の径を第２端面部（３４）より大径になるように形成すればよい。それにより、第１端面部（３２）が雌ねじ孔（２１）の周縁部（２５）から受ける第１反力は、第２端面部（３４）がストッパ部（１７）から受ける第２反力よりコントロールリング（３０）の回転中心から遠い位置に作用することになる。また、作用と反作用の関係により、第１反力と第２反力とは同じであることから、第１反力に基づく摩擦トルクが第２反力に基づく摩擦トルクより大きくなる。それにより、ナット部材（２０）の締め込み時に、ナット部材（２０）とコントロールリング（３０）とが共回りするようになる。
【００１８】
これに限らず、第１端面部（３２）を、その第１端面部（３２）が雌ねじ孔（２１）の周縁部（２５）から受ける第１反力と前記コントロールリング（３０）の中心から第１反力を受ける部分までの距離との積の総和が、第２端面部（３４）がストッパ（１７）に接する第２反力とコントロールリング（３０）の中心から第２反力を受ける部分までの距離との積の総和より大きくなるように形成してもよい。
【００１９】
以上は、共回りを目的として、第１端面部（３２）と第２端面部（３４）の形状やその位置を特定したものであるが、ナット部材（２０）、コントロールリング（３０）および継手本体（１０）の材質をそれぞれ選定することで、第１端面部（３２）と雌ねじ孔（２１）の周縁部（２５）との間の摩擦係数を、第２端面部（３４）とストッパ部（１７）との間の摩擦係数より大きくするようにしてもよい。それにより、ナット部材（２０）の締め込み時に、ナット部材（２０）とコントロールリング（３０）とが共回りするようにしてもよい。
【００２０】
ナット部材（２０）とコントロールリング（３０）とが共回りすることで、ナット部材（２０）の締め込み強度が適正な状態になったことが判るが、ナット部材（２０）の締め込み作業をさらに確実に行うために、ナット部材（２０）とコントロールリング（３０）とがどの程度共回りしたかを明確にさせる必要がある。それには、コントロールリング（３０）の外周縁（３８）に周方向に所定の間隔で目印部（３６）を連設すればよい。共回りする時に、目印部（３６）がコントロールリング（３０）と共に回転し、その目印部（３６）が回転した程度を見ることで、ナット部材（２０）とコントロールリング（３０）とがどの程度共回りしたかを簡単に確認することができる。
【００２１】
コントロールリング（３０）はナット部材（２０）と継手本体（１０）のストッパ部（１７）との両者の間に挟まれていて、両者の影になりやすく、その目印部（３６）も見難くなり勝ちであり、共回りの程度を簡単に確認できない場合が生じる。
【００２２】
そこで、先ず、第１端面部（３２）の外周を成す外周縁（３８）をその外周縁（３８）の径がナット部材（２０）の外径より大きくなるように形成し、次に、第１端面部（３２）の外周縁（３８）に、その外周縁（３８）の周方向に所定の間隔で切欠き（３６）を連設するようにすればよい。それにより、切欠き（３６）は、前記両者の影にならないで目立つようになり、共回りの程度を簡単に確認することができる。
【００２４】
【発明の実施の形態】
以下、図面に基づき本発明の一実施の形態を説明する。各図は本発明の一実施の形態を示している。図１は、本発明の一実施の形態に係るチューブ材の継手の要部断面図である。図２は同じく本実施の形態に係るコントロールリングを図１のII方向から見たときの矢視図、図３は同じく図１のIII方向から見たときの矢視図である。
【００２５】
図１〜図３に示すように、本チューブ材Ｔの継手は、フッ素樹脂製の継手本体１０と、同じく、フッ素樹脂製のナット部材２０とから成る。フッ素樹脂としては、耐薬品性に優れた特性を有する「ＰＴＦＥ（ポリテトラフルオロエチレン）」と「ＰＦＡ（テトラフルオロエチレン／パーフルオロアルキルビニルエーテル共重合体）」とが挙げられる。
【００２６】
ナット部材２０は、いわゆる袋ナットであり、その雌ねじ孔２１の奥側にねじ軸に直交する袋部である奥壁２２を有している。ナット部材２０の雌ねじ孔２１の入口側には雌ねじ部２３が刻設され、ナット部材２０の奥壁２２にチューブ材を奥壁２２側から雌ねじ孔２１内へ差し込むための差込孔２４が穿設されている。
【００２７】
ナット部材２０は略六角断面形の被締付部２７を有し、被締付部２７にナット締付工具（レンチ）を嵌め込むように成っている。継手本体１０は、ナット部材２０の雌ねじ孔２１の奥側へ挿入される先端部１１に被外嵌部１２が形成されている。被外嵌部１２には、ナット部材２０の差込孔２４を通って雌ねじ孔２１内に差し込まれたチューブ材Ｔの一端部が拡径した状態で外嵌している。したがって、雌ねじ孔２１内に差し込まれたチューブ材Ｔの一端部は、一般外径部Ｔ１、被外嵌部１２に外嵌する大径の拡径部Ｔ２、および、一般外径部Ｔ１と拡径部Ｔ２とを繋ぐ中間部である段差部Ｔ３（または、拡がり（フレアー：ｆｌａｒｅ））から成っている。
【００２８】
継手本体１０の先端部１１には、被外嵌部１２に続いて、雌ねじ部２３に螺合する雄ねじ１３が刻設されている。雄ねじ１３に螺合するナット部材２０の雌ねじ部２３のねじ山の径および、ナット部材２０の雌ねじ孔２１の孔内周壁２１ａは、チューブ材Ｔの拡径部Ｔ２が相対的に挿通可能に、かつ、ねじ山等の径が最小になるように、拡径部Ｔ２の外径よりわずかに大きく設定されている。
【００２９】
継手本体１０の雄ねじ１３の奥側には、略六角断面形のストッパ部１７を有している。継手本体１０の基端部は、Ｌ字形に曲がったエルボー部を形成している。継手本体１０には、チューブ材Ｔの内径とほぼ同じ孔径で、ねじ軸方向へ貫通する貫通孔１４が穿設されている。
【００３０】
なお、本実施の形態では、継手本体１０の基端部にはエルボー部が形成されているが、これに限らない。すなわち、継手本体１０の基端部は、Ｌ字形に曲がらずに、真っ直ぐであってもよく、また、貫通孔１４がＴ字路形に形成されるものであっても良い。
【００３１】
ナット部材２０の雌ねじ孔２１の奥側へ継手本体１０の先端部１１が挿入された状態では、ナット部材２０の奥壁２２と継手本体１０の貫通孔１４の口縁部１５とがねじ軸と平行な方向線上で対向している。貫通孔１４の口縁部１５の外周縁には、チューブ材Ｔの一端部を外嵌し易く、さらに、安定した気密性を保持するために面取り斜面部１９が施されている。また、口縁部１５の内周縁には、移動媒体である液の溜まり防止のための面取り斜面部１９ａが施されている。
【００３２】
また、チューブ材Ｔの一端部が外嵌する継手本体１０の先端部１１の被外嵌部１２は、ナット部材２０の締め込み力に対向してその縮径方向の変形を最小に抑えて、シール力の緩和を防止すべく、十分な肉厚を有し必要な剛性を備えている。一方、ナット部材２０の奥壁２２は、差込孔２４の中心（ねじ軸の軸心）に向かって、継手本体１０の貫通孔１４の口縁部１５の方向（ねじ孔の入口方向）へ所定角度（２５度〜３５度）で傾く食込み部２２ａに成っている。
【００３３】
ナット部材２０の締め込み時に、継手本体１０の雄ねじ１３にはコントロールリング３０が外嵌している。コントロールリング３０は、一部が開いた略Ｃ字形状に形成されている。その開いた部分３９を継手本体１０の雄ねじ１３のねじ軸に対して直交する方向から外嵌する。コントロールリング３０は、継手本体１０のストッパ部１７とナット部材２０の雌ねじ孔２１の孔周縁とにより挟まれることで、ナット部材２０の締め込み強度を調整可能なものである。
【００３４】
コントロールリング３０の材質としては、ポリプロピレン樹脂、ポリエチレン樹脂、ポリ塩化ビニール樹脂などの合成樹脂が用いられる。また、ＰＶＦ、ＰＶＤＦ、ＥＣＴＦＥ、ＰＣＴＦＥ、ＥＴＦＥ、ＦＥＰ、ＰＦＡ、ＰＴＦＥなどのフッ素樹脂を用いるようにしてもよい。
【００３５】
コントロールリング３０は、ナット部材２０の締め込み時に、ナット部材２０の雌ねじ孔２１の周縁部２５に対し接触する第１端面部３２と、継手本体１０のストッパ部１７に対し接触する第２端面部３４とを有している。
【００３６】
第１端面部３２は、ナット部材２０の締め込み時に、第１端面部３２が雌ねじ孔２１の周縁部２５から受ける摩擦トルクを第２端面部３４がストッパ部１７から受ける摩擦トルクより大きくすることで、ナット部材２０とコントロールリング３０とが共回りするように形成されている。
【００３７】
具体的には、第１端面部３２は、雌ねじ孔２１の周縁部２５の円周方向に沿って形成され、第２端面部３４は、ストッパ部１７の円周方向に沿って形成され、第１端面部３２の直径Ｄ１は、第２端面部３４の直径Ｄ２より大きくなるように形成されている。また、第１端面部３２の幅、第２端面部３４の幅をＷ１、Ｗ２とすると、第１端面部３２が雌ねじ孔２１の周縁部２５に対し接触する接触面積Ｓ１（図２においてハッチングで示した部分）は約πＤ１・Ｗ１となり、第２端面部３４がストッパ部１７に対し接触する接触面積Ｓ２（図３においてハッチングで示した部分）は約πＤ２・Ｗ２となる。
【００３８】
コントロールリング３０の第２端面部３４には段部３５が形成されている。段部３５は、第２端面部３４の大径の部分にあって、ストッパ部１７から後退してストッパ部１７と接触しないようになっている。その結果、第２端面部３４のストッパ部１７と接触する部位が小径になっている。また、コントロールリング３０の内周面３７には、雄ねじ１３およびその首部１３ａ（雄ねじ１３より小径の部位）とにそれぞれ外嵌するように第１内周面３７ａおよび第２内周面３７ｂとが形成されている。
【００３９】
次に、本実施の形態の作用について説明する。
チューブ材Ｔの一端部がナット部材２０の差込孔２４を通って雌ねじ孔２１内に差し込まれ、チューブ材Ｔの一端部の拡径部Ｔ２が継手本体１０の先端部１１である被外嵌部１２に外嵌している。チューブ材Ｔの一般外径部Ｔ１から拡径した状態の拡径部Ｔ２にかかる段差部Ｔ３は、継手本体１０の被外嵌部１２の面取り斜面部１９に沿って斜めに拡がっている。継手本体１０の先端部１１をナット部材２０の雌ねじ孔２１の奥側へ挿入していくと、継手本体１０の雄ねじ１３の始端が、ナット部材２０の雌ねじ部２３の始端に当接する。このとき、チューブ材Ｔの拡径部Ｔ２は、ナット部材２０の雌ねじ孔２１（雌ねじ部２３のねじ山あるいは、雌ねじ孔２１の孔内周壁２１ａ）に、わずかな隙間を介して、あるいは雌ねじ孔２１に摺接しながら相対的に挿通していく。
【００４０】
ナット部材２０の被締付部２７に締付工具を嵌め込むとともに、継手本体１０のストッパ部１７に同じく、締付工具を嵌め込んで、これらを相対的に回転させれば、継手本体１０の雄ねじ１３にナット部材２０の雌ねじ部２３が螺進していく。継手本体１０の雄ねじ１３にナット部材２０の雌ねじ部２３が完全に螺着した状態では、ナット部材２０の奥壁２２の食込み部２２ａは、チューブ材Ｔの段差部Ｔ３に食い込み、チューブ材Ｔの抜けを防止することができる。さらに、チューブ材Ｔと継手本体１０の面取り斜面部１９が圧接されるので、高い気密性を得ることができる。
【００４１】
ナット部材２０の雌ねじ孔２１内にチューブ材Ｔの一端部を差し込み、そのチューブ材Ｔの一端部を継手本体１０に外嵌し、ナット部材２０の雌ねじを継手本体１０の雄ねじ１３に締め込むことで、チューブ材Ｔの一端部を支持するようになっている。また、コントロールリング３０は継手本体１０の雄ねじ１３に外嵌しておく。
【００４２】
ナット部材２０の締め込み作業の前に、継手本体１０の雄ねじ１３のねじ軸に対して直交する方向からコントロールリング３０の開いた部分３９をその雄ねじ１３に外嵌しておく。次に、ナット部材２０の雌ねじ部２３を継手本体１０の雄ねじ１３に締め込んでいくと、コントロールリング３０は継手本体１０のストッパ部１７とナット部材２０の雌ねじ孔２１の孔周縁とにより挟まれるようになり、やがて、ナット部材２０の雌ねじ孔２１の周縁部２５に対しコントロールリング３０の第１端面部３２が接触し、継手本体１０のストッパ部１７に対しコントロールリング３０の第２端面部３４が接触するようになる。
【００４３】
このナット部材２０の締め込み時に、第１端面部３２が雌ねじ孔２１の周縁部２５から受ける摩擦トルクは、第２端面部３４がストッパ部１７から受ける摩擦トルクより大きくなり、ナット部材２０とコントロールリング３０とが共回りするようになり、ナット部材２０の締め込み強度が適正な状態になる。
【００４４】
具体的には、第１端面部３２の径を第２端面部３４より大径になるように形成しているので、第１端面部３２が雌ねじ孔２１の周縁部２５から受ける第１反力は、第２端面部３４がストッパ部１７から受ける第２反力よりコントロールリング３０の回転中心から遠い位置に作用することになる。
【００４５】
第１反力、第２反力をＦ１、Ｆ２とし、コントロールリング３０の回転中心から各反力Ｆ１、Ｆ２の作用する位置までの距離をＲ１、Ｒ２とし、第１端面部３２、第２端面部３４に係る摩擦係数を共にμとすれば、第１反力に基づく摩擦トルクは、ΣμＦ１・Ｒ１となり、第２反力に基づく摩擦トルクは、ΣμＦ２・Ｒ２となる。
【００４６】
ここで、摩擦係数μは、静摩擦係数であり、第１反力Ｆ１に基づく摩擦トルクは、第１端面部３２が雌ねじ孔２１の周縁部２５から受ける第１反力Ｆ１とコントロールリング３０の中心（回転中心）から第１反力Ｆ１を受ける部分までの距離Ｒ１との積の総和であり、第２反力Ｆ２に基づく摩擦トルクは、第２端面部３４がストッパ１７に接する第２反力Ｆ２とコントロールリング３０の中心から第２反力Ｆ２を受ける部分までの距離Ｒ２との積の総和である。
【００４７】
ナット部材２０を締め込むとき、作用と反作用の関係により、第１反力と第２反力とは同じであり（Ｆ１＝Ｆ２）、また、Ｒ１＞Ｒ２であることから、第１反力に基づく摩擦トルク（ΣμＦ１・Ｒ１）が第２反力に基づく摩擦トルク（ΣμＦ２・Ｒ２）より大きくなり、第２端面部３４が先にストッパ部１７に対して滑り始め、それにより、ナット部材２０の締め込み時に、ナット部材２０とコントロールリングとが共回りするようになる。
【００４８】
ナット部材２０とコントロールリング３０との共回りの状態を確認した上で、ナット部材２０の締め込み作業を終了すれば、ナット部材２０の適正な初期締め込み位置を決定することができ、ナット部材２０の締め込み作業を簡単かつ確実に行うことができる。また、ナット部材２０の締め込み不足や締め込み過ぎによる不具合を防止することができ、特に、ナット部材２０の締め込み過ぎによる継手本体１０の損傷を防止することができる。
【００４９】
また、ナット部材２０とコントロールリング３０とが共回りするとき、コントロールリング３０の開いた部分３９が目印となって、ナット部材２０とコントロールリング３０の開いた部分３９とが共回りすることで、ナット部材２０とコントロールリング３０とがどの程度共回りしたかが明確になり、それにより、ナット部材２０の締め込み作業をさらに確実に行うことができる。
【００５０】
ナット部材２０の締め込み作業が終了した後に、チューブ継手は使用可能になるが、長期使用でチューブ材を支持する力が減少する場合があり、その支持する力の減少を防止すべく、所定期間使用した後にナット部材２０を増し締めする必要がある。ナット部材２０を増し締めするとき、コントロールリング３０を継手本体１０の雄ねじ１３から取り外す必要がある。このとき、コントロールリング３０の開いた部分３９の間の隙間に継手本体１０の雄ねじ１３を相対的に通すようにすれば、コントロールリング３０を継手本体１０の雄ねじ１３から容易に抜き出すことができる。
【００５１】
一方、ナット部材２０を増し締めするとき、増し締め用のコントロールリング３０をナット部材２０とストッパ１７との間の隙間に介在させてもよい。ナット部材２０の増し締めのときにも、ナット部材２０とコントロールリング３０とが必ず共回りするように設定する。
【００５２】
なお、前記実施の形態では、コントロールリング３０の第１端面部３２の径を第２端面部３４より大径にすることで、ナット部材２０とコントロールリング３０とが必ず共回りするようにしたものを示したが、第１端面部３２、第２端面部３４に係る摩擦係数をそれぞれμ１、μ２（μ１＞μ２）とすれば、仮にＲ１＝Ｒ２であっても、第１反力に基づく摩擦トルク（Σμ１・Ｆ１・Ｒ１）は、第２反力に基づく摩擦トルク（Σμ２・Ｆ２・Ｒ２）より大きくなり、それにより、ナット部材２０の締め込み時に、ナット部材２０とコントロールリングとが共回りするようになる。
【００５３】
さらに、図４〜図６に示すように、コントロールリング３０の外周縁３８にその周方向に所定の間隔で目印部を連設してもよい。具体的には、第１端面部３２の外周を成し、その径がナット部材２０の外径より大きな外周縁３８に、その外周縁３８の周方向に所定の間隔で目印部である切欠き３６を連設すればよい。
【００５４】
ナット部材２０とコントロールリング３０とが共回りする時に、切欠き３６がコントロールリング３０と一体的に回転する。具体的には、切欠き３６が図６（ａ）に示す共回り前の状態から図６（ｂ）に示す共回り後の状態になる。その切欠き３６が回転した程度（図６では約４５度の角度）を見ることで、ナット部材２０とコントロールリング３０とがどの程度共回りしたかを簡単に確認することができる。また、ナット部材２０の外径より大きな外周縁３８に切欠き３６を設けることで、切欠き３６がナット部材２０とストッパ部１７との両者の影にならないで目立つようになり、共回りの程度を簡単に確認することができる。
【００５５】
さらに、図７および図８は前記実施の形態の変形例であり、図７はコントロールリングの正面図、図８は図７のVIII−VIII線断面図を示している。また、図９および図１０は前記実施の形態の他の変形例であり、コントロールリングの正面図、図１０は図９のＸ−Ｘ線断面図を示している。
【００５６】
図７〜図１０に示すように、第２端面部３４には前記実施の形態のように段部３５が形成されていない。このコントロールリング３０では、第１端面部３２および第２端面部３４の各最大の径はほぼ同じになる一方、第１端面部３２の最小の径より第２端面部３４の最小の径が小さくなっている。それにより、コントロールリング３０の第１端面部３２は第２端面部３４に対し、雌ねじ孔２１の周縁部２５から受ける第１反力Ｆ１を第１端面部３２の大径の部分で集中的に受けるようになっている。
【００５７】
それにより、第１反力に基づく摩擦トルクが第２反力に基づく摩擦トルクより大きくなり、第２端面部３４が先にストッパ部１７に対して滑り始め、ナット部材２０の締め込み時に、ナット部材２０とコントロールリングとが共回りするようになる。
【００５８】
【発明の効果】
以上説明したように、本発明に係るチューブ材の継手においては、ナット部材の締め込み時に、コントロールリングの第１端面部がナット部材の雌ねじ孔の周縁部から受ける摩擦トルクをコントロールリングの第２端面部が継手本体のストッパ部から受ける摩擦トルクより大きくするようにしたので、ナット部材の締め込みの最終段階で、ナット部材とコントロールリングとが確実に共回りするようになり、ナット部材の適正な初期締め込み位置を決定することができ、ナットの締め込み作業性を向上することができるとともに、継手本体の破損を防止することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係るチューブ材の継手の要部断面図である。
【図２】本発明の一実施の形態に係るコントロールリングを図１のII方向から見たときの矢視図である。
【図３】本発明の一実施の形態に係るコントロールリングを図１のIII方向から見たときの矢視図である。
【図４】本発明の他の実施の形態に係るコントロールリングの正面図である。
【図５】図４のＶ−Ｖ線断面図である。
【図６】本発明の他の実施の形態に係るコントロールリングが共回りする前後の状態を示す説明図であり、（ａ）は共回り前の状態を示し、（ｂ）は共回り後の状態を示している。
【図７】本発明の実施の形態の変形例に係るコントロールリングの正面図である。
【図８】図７のVIII−VIII線断面図である。
【図９】本発明の実施の形態の他の変形例に係るコントロールリングの正面図である。
【図１０】図９のＸ−Ｘ線断面図である。
【符号の説明】
Ｓ１…接触面積
Ｓ２…接触面積
Ｔ…チューブ材
Ｔ１…一般外径部
Ｔ２…拡径部
Ｔ３…段差部
１０…継手本体
１１…先端部
１２…被外嵌部
１３…雄ねじ
１３ａ…首部
１４…貫通孔
１５…口縁部
１７…ストッパ部
１９ａ…面取り斜面部
２０…ナット部材
２１…雌ねじ孔
２１ａ…孔内周壁
２２…奥壁
２２ａ…食込み部
２３…雌ねじ部
２４…差込孔
２７…被締付部
３０…コントロールリング
３２…第１端面部
３４…第２端面部
３５…段部
３６…切欠き
３７…内周面
３７ａ…第１内周面
３７ｂ…第２内周面
３８…外周縁
３９…開いた部分[0001]
BACKGROUND OF THE INVENTION
The present invention supports one end portion of the tube material by fitting one end portion of the tube material inserted into the female screw hole of the nut member into the joint body, and tightening the female screw of the nut member to the male screw of the joint body. The present invention relates to a tube material joint. In particular, the present invention relates to a resin joint for a tube material that controls a flow conduit for pure water cleaning liquid and other chemicals used in a clean room at a manufacturing site for high-density semiconductor chips.
[0002]
[Prior art]
As a conventional tube material joint, for example, there is one disclosed in JP-A-7-243564.
[0003]
That is, when tightening the nut to the joint body, both ends of the resin spacer come into contact with the joint body and the nut, and when the spacer becomes unrotatable by turning with a finger, the nut tightening end position is set. Even if you turn the nut too much after the tightening end position with a tightening tool such as a wrench, the nut presses and deforms the resin spacer, so there is no excessive stress on the threaded part and the joint body is not damaged. The nut tightening operation can be completed.
[0004]
In addition, in this publication, when both end surfaces of the resin spacer come into contact with the joint body surface and the nut end surface, respectively, the resin spacer begins to rotate with the nut due to the friction torque difference acting on both end surfaces of the resin spacer. The thing which can complete | finish tightening | tightening of a nut is disclosed because an operator can see easily by the movement of the rotation direction of the outer shape of a resin spacer.
[0005]
[Problems to be solved by the invention]
However, in such a conventional tube joint, at the final stage of tightening the nut, every time the nut is tightened little by little, it is necessary to check whether the resin spacer is rotated with a finger or not. The nut tightening operation is troublesome and the workability is not good.
Also, if the friction torque acting on the resin spacer from the nut side is greater than the friction torque acting on the resin spacer from the joint body side, the resin spacer and nut start to rotate together, and the nut is tightened. On the contrary, if the friction torque acting on the resin spacer from the nut side is smaller than the friction torque acting on the resin spacer from the joint body side, the resin The spacer and the nut do not always rotate together, so the nut may be insufficiently tightened or tightened excessively, resulting in malfunctions. Especially in the case of resin joints, the nuts are tightened unlike metal joints. However, there is a problem that the joint body may be damaged if the nut is tightened and the nut is tightened too much.
[0006]
The present invention has been made by paying attention to such problems of the prior art, and in the final stage of tightening of the nut member, the nut member and the control ring are reliably rotated together, thereby the nut member It is an object of the present invention to provide a tube material joint that can determine an appropriate initial tightening position, can improve nut tightening workability, and can prevent damage to the joint body. .
[0007]
[Means for Solving the Problems]
  The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] One end portion of the tube material (T) inserted into the female screw hole (21) of the nut member (20) is externally fitted to the joint main body (10), and the female screw of the nut member (20) is connected to the joint main body ( In the joint of the tube material (T) that supports the one end portion of the tube material (T) by tightening to the male screw (13) of 10),
  A circumferential shape that is externally fitted to the male thread (13) of the joint body (10) and is formed on the inner side of the male thread (13) of the joint body (10) when the nut member (20) is tightened. Is sandwiched between the stopper portion (17), which is a flange of the nut, and the peripheral portion (25) of the female screw hole (21) of the nut member (20), so that the tightening strength of the nut member (20) can be adjusted. Equipped with a resin control ring (30),
  When the nut member (20) is tightened, the control ring (30) contacts the peripheral portion (25) of the female screw hole (21) of the nut member (20), and the circular portion of the peripheral portion (25). From the first end surface portion (32) between the first end surface portion (32) formed along the circumferential direction and the step portion (35) not contacting the stopper portion (17) of the joint body (10). A second end surface portion formed along the circumferential direction of the stopper portion (17), which is formed to have a small diameter, contacts the stopper portion (17), and has a smaller diameter than the stopper portion (17). 34)The inner peripheral surface (37) of the control ring (30) is fitted around the male screw (13) and the neck (13a) of the joint body (10), respectively.
  The first end surface portion (32) is formed so that the diameter of the first end surface portion (32) is larger than the diameter of the second end surface portion (34) and the step portion (35) is provided. ) Wider than the width of the second end surface portion (34), the contact area where the first end surface portion (32) contacts the peripheral edge portion (25) of the female screw hole (21) is increased. The second end surface portion (34) is larger than the contact area with which the stopper portion (17) contacts,
  Depending on the size relationship of the contact area,The first end surface portion (32) has a coefficient of friction between the first end surface portion (32) and the peripheral edge portion (25) of the female screw hole (21), and the second end surface portion (34) and the stopper. The nut member (20) and the control ring (30) are formed so as to rotate together when the nut member (20) is tightened by making the coefficient of friction between the portion (17) larger. It was configured to obtain an appropriate tightening strength by confirming the co-rotation of the control ring (30).
  A tube material (T) joint characterized by the above.
[0009]
[2] One end portion of the tube member (T) inserted into the female screw hole (21) of the nut member (20) is externally fitted to the joint main body (10), and the female screw of the nut member (20) is connected to the joint main body ( In the joint of the tube material (T) that supports the one end portion of the tube material (T) by tightening to the male screw (13) of 10),
  A circumferential shape that is externally fitted to the male thread (13) of the joint body (10) and is formed on the inner side of the male thread (13) of the joint body (10) when the nut member (20) is tightened. Is sandwiched between the stopper portion (17), which is a flange of the nut, and the peripheral portion (25) of the female screw hole (21) of the nut member (20), so that the tightening strength of the nut member (20) can be adjusted. Equipped with a resin control ring (30),
  When the nut member (20) is tightened, the control ring (30) contacts the peripheral portion (25) of the female screw hole (21) of the nut member (20), and the circular portion of the peripheral portion (25). From the first end surface portion (32) between the first end surface portion (32) formed along the circumferential direction and the step portion (35) not contacting the stopper portion (17) of the joint body (10). A second end surface portion formed along the circumferential direction of the stopper portion (17), which is formed to have a small diameter, contacts the stopper portion (17), and has a smaller diameter than the stopper portion (17). 34)The inner peripheral surface (37) of the control ring (30) is fitted around the male screw (13) and the neck (13a) of the joint body (10), respectively.
  The first end surface portion (32) is formed so that the diameter of the first end surface portion (32) is larger than the diameter of the second end surface portion (34) and the step portion (35) is provided. ) Wider than the width of the second end surface portion (34), the contact area where the first end surface portion (32) contacts the peripheral edge portion (25) of the female screw hole (21) is increased. The second end surface portion (34) is larger than the contact area with which the stopper portion (17) contacts,
  Depending on the size relationship of the contact area,When the nut member (20) is tightened, the female screw hole (21)Peripheral part (25)By making the friction torque received from the friction torque received from the stopper portion (17) larger, the nut member (20) and the control ring (30) are formed to rotate together,
  On the outer peripheral edge (38) of the control ring (30), mark portions (36) are continuously provided at a predetermined interval in the circumferential direction of the outer peripheral edge (38). Configured to ensure proper tightening strength by checking
  A tube material (T) joint characterized by the above.
[0011]
[3] The first end surface portion (32) is formed along the circumferential direction of the peripheral edge portion (25) of the female screw hole (21),
  The second end surface portion (34) is formed along the circumferential direction of the stopper portion (17),
  The first end surface portion (32) is formed from the first reaction force that the first end surface portion (32) receives from the peripheral portion (25) of the female screw hole (21) and the center of the control ring (30). The sum of the product of the distance to the portion receiving the reaction force is the second reaction force at which the second end face portion (34) contacts the stopper (17) and the center of the control ring (30). It is formed to be larger than the sum of products with the distance to the part that receives
  The joint of the tube material (T) according to [1] or [2], wherein
[0012]
[4] The outer peripheral edge (38) of the control ring (30) is formed such that the diameter of the outer peripheral edge (38) is larger than the outer diameter of the nut member (20),
  The said mark part (36) is the notch (36) formed in the outer periphery (38) of the said control ring (30).
  The joint of the tube material (T) according to [2].
[0014]
Next, the operation of the present invention will be described.
One end portion of the tube material (T) is inserted into the female screw hole (21) of the nut member (20), one end portion of the tube material (T) is externally fitted to the joint body (10), and the nut member (20) By tightening the female screw into the male screw (13) of the joint body (10), one end of the tube material (T) is supported. Further, the control ring (30) is fitted on the male screw (13) of the joint body (10).
[0015]
As the nut member (20) is tightened, the control ring (30) is sandwiched between the stopper portion (17) of the joint body (10) and the peripheral edge of the female screw hole (21) of the nut member (20). Thus, the first end surface portion (32) of the control ring (30) comes into contact with the peripheral edge portion (25) of the female screw hole (21) of the nut member (20), and the stopper portion (17) of the joint body (10) is brought into contact. On the other hand, the second end surface portion (34) of the control ring (30) comes into contact.
[0016]
When the nut member (20) is tightened, the friction torque received by the first end surface portion (32) from the peripheral portion (25) of the female screw hole (21) is the second end surface portion (34) from the stopper portion (17). Since the first end surface portion (32) and the second end surface portion (34) are formed so as to be larger than the friction torque to be received, the nut member (20) and the control ring (30) are rotated together. Become. This co-rotation is a phenomenon that occurs when the tightening strength of the nut member (20) is in an appropriate state. After confirming the co-rotation state, the tightening operation of the nut member (20) is completed. Then, the proper initial tightening position of the nut member (20) can be determined, the tightening operation of the nut member (20) can be easily and reliably performed, and the nut member (20) is insufficiently tightened. In addition, it is possible to prevent problems due to excessive tightening, and in particular, it is possible to prevent damage to the joint body (10) due to excessive tightening.
[0017]
Specifically, the first end surface portion (32) is formed along the circumferential direction of the peripheral edge portion (25) of the female screw hole (21), and the second end surface portion (34) is the circumference of the stopper portion (17). What is necessary is just to form so that the diameter of a 1st end surface part (32) may become larger than a 2nd end surface part (34) when formed along a direction. Accordingly, the first reaction force received by the first end surface portion (32) from the peripheral portion (25) of the female screw hole (21) is greater than the second reaction force received by the second end surface portion (34) from the stopper portion (17). It acts on a position far from the center of rotation of the control ring (30). Further, the first reaction force and the second reaction force are the same due to the relationship between the action and the reaction, so that the friction torque based on the first reaction force is larger than the friction torque based on the second reaction force. Thereby, the nut member (20) and the control ring (30) come to rotate together when the nut member (20) is tightened.
[0018]
Not only this but the 1st end surface part (32) from the center of the 1st reaction force which the 1st end surface part (32) receives from the peripheral part (25) of a female screw hole (21), and the center of the control ring (30) The sum of the product with the distance to the portion that receives the first reaction force receives the second reaction force from the center of the control ring (30) and the second reaction force at which the second end surface portion (34) contacts the stopper (17). You may form so that it may become larger than the sum total of the product with the distance to a part.
[0019]
The above description specifies the shapes and positions of the first end surface portion (32) and the second end surface portion (34) for the purpose of co-rotation. The nut member (20), the control ring (30), and the joint are specified. By selecting the material of the main body (10), the friction coefficient between the first end surface portion (32) and the peripheral edge portion (25) of the female screw hole (21) can be changed to the second end surface portion (34) and the stopper portion. You may make it make it larger than a friction coefficient between (17). Thereby, the nut member (20) and the control ring (30) may rotate together when the nut member (20) is tightened.
[0020]
It can be seen that the nut member (20) and the control ring (30) rotate together, so that the tightening strength of the nut member (20) is in an appropriate state, but the nut member (20) is tightened. In order to carry out more reliably, it is necessary to clarify how much the nut member (20) and the control ring (30) have rotated together. For this purpose, mark portions (36) may be provided continuously at a predetermined interval in the circumferential direction on the outer peripheral edge (38) of the control ring (30). When the joint portion rotates together, the mark portion (36) rotates with the control ring (30), and the degree of rotation of the mark portion (36) shows how much the nut member (20) and the control ring (30) are. You can easily check if you have co-rotated.
[0021]
The control ring (30) is sandwiched between the nut member (20) and the stopper portion (17) of the joint main body (10), and is easily shaded between them, and the mark portion (36) is also difficult to see. There is a case where it is easy to confirm the degree of co-rotation.
[0022]
Therefore, first, the outer peripheral edge (38) forming the outer periphery of the first end face portion (32) is formed so that the diameter of the outer peripheral edge (38) is larger than the outer diameter of the nut member (20), and then The notches (36) may be connected to the outer peripheral edge (38) of the one end surface portion (32) at a predetermined interval in the circumferential direction of the outer peripheral edge (38). Thereby, the notch (36) becomes conspicuous without being a shadow of the both, and the degree of co-rotation can be easily confirmed.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Each figure shows an embodiment of the present invention. FIG. 1 is a cross-sectional view of an essential part of a tube material joint according to an embodiment of the present invention. 2 is an arrow view when the control ring according to the present embodiment is viewed from the II direction of FIG. 1, and FIG. 3 is an arrow view when the control ring is also viewed from the III direction of FIG.
[0025]
As shown in FIGS. 1 to 3, the joint of the tube material T includes a joint body 10 made of fluororesin and a nut member 20 made of fluororesin. Examples of the fluororesin include “PTFE (polytetrafluoroethylene)” and “PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer)” having characteristics excellent in chemical resistance.
[0026]
The nut member 20 is a so-called cap nut, and has a back wall 22 that is a bag portion orthogonal to the screw shaft on the back side of the female screw hole 21. A female screw portion 23 is formed on the inlet side of the female screw hole 21 of the nut member 20, and an insertion hole 24 for inserting the tube material into the female screw hole 21 from the rear wall 22 side is formed in the inner wall 22 of the nut member 20. It is installed.
[0027]
The nut member 20 has a tightening portion 27 having a substantially hexagonal cross section, and a nut tightening tool (wrench) is fitted into the tightened portion 27. In the joint main body 10, an outer fitting portion 12 is formed at a distal end portion 11 inserted into the inner side of the female screw hole 21 of the nut member 20. The external fitting portion 12 is externally fitted with one end portion of the tube material T inserted into the female screw hole 21 through the insertion hole 24 of the nut member 20 being expanded. Therefore, one end portion of the tube material T inserted into the female screw hole 21 is expanded with the general outer diameter portion T1, the large diameter enlarged portion T2 fitted to the fitted portion 12, and the general outer diameter portion T1. It consists of a stepped portion T3 (or a spread (flare)) that is an intermediate portion connecting the diameter portion T2.
[0028]
A male screw 13 that is screwed into the female screw portion 23 is engraved on the distal end portion 11 of the joint body 10 following the fitted portion 12. The diameter of the thread of the female thread portion 23 of the nut member 20 that is screwed into the male screw 13 and the inner peripheral wall 21a of the female screw hole 21 of the nut member 20 are such that the expanded diameter portion T2 of the tube material T can be relatively inserted. And it is set slightly larger than the outer diameter of the enlarged diameter portion T2 so that the diameter of the screw thread or the like is minimized.
[0029]
A stopper portion 17 having a substantially hexagonal cross section is provided on the back side of the male screw 13 of the joint body 10. The base end portion of the joint body 10 forms an elbow portion bent in an L shape. The joint body 10 has a through hole 14 having a hole diameter substantially the same as the inner diameter of the tube material T and penetrating in the screw shaft direction.
[0030]
In the present embodiment, the elbow portion is formed at the proximal end portion of the joint body 10, but this is not a limitation. That is, the base end portion of the joint body 10 may be straight without being bent in an L shape, and the through hole 14 may be formed in a T-shaped path.
[0031]
In a state where the distal end portion 11 of the joint body 10 is inserted into the back side of the female screw hole 21 of the nut member 20, the back wall 22 of the nut member 20 and the rim portion 15 of the through hole 14 of the joint body 10 are connected to the screw shaft. Opposites on parallel direction lines. A chamfered slope portion 19 is provided on the outer peripheral edge of the rim portion 15 of the through-hole 14 in order to easily fit one end portion of the tube material T and to maintain stable airtightness. Further, a chamfered inclined surface portion 19a is provided on the inner peripheral edge of the mouth edge portion 15 to prevent the liquid as a moving medium from being accumulated.
[0032]
Further, the externally fitted portion 12 of the distal end portion 11 of the joint body 10 to which the one end portion of the tube material T is externally fitted is opposed to the tightening force of the nut member 20, and the deformation in the reduced diameter direction is minimized, In order to prevent the relaxation of the sealing force, it has a sufficient thickness and has the necessary rigidity. On the other hand, the inner wall 22 of the nut member 20 is directed toward the edge 15 of the through hole 14 of the joint body 10 (in the direction of the inlet of the screw hole) toward the center of the insertion hole 24 (axial center of the screw shaft). The biting portion 22a is inclined at a predetermined angle (25 degrees to 35 degrees).
[0033]
When the nut member 20 is tightened, the control ring 30 is externally fitted to the male screw 13 of the joint body 10. The control ring 30 is formed in a substantially C shape with a part opened. The opened portion 39 is externally fitted from the direction orthogonal to the screw axis of the male screw 13 of the joint body 10. The control ring 30 can adjust the tightening strength of the nut member 20 by being sandwiched between the stopper portion 17 of the joint body 10 and the peripheral edge of the female screw hole 21 of the nut member 20.
[0034]
As a material for the control ring 30, a synthetic resin such as polypropylene resin, polyethylene resin, or polyvinyl chloride resin is used. Moreover, you may make it use fluororesins, such as PVF, PVDF, ECTFE, PCTFE, ETFE, FEP, PFA, and PTFE.
[0035]
When the nut member 20 is tightened, the control ring 30 includes a first end surface portion 32 that contacts the peripheral portion 25 of the female screw hole 21 of the nut member 20 and a second end surface portion that contacts the stopper portion 17 of the joint body 10. 34.
[0036]
When the nut member 20 is tightened, the first end surface portion 32 makes the friction torque that the first end surface portion 32 receives from the peripheral portion 25 of the female screw hole 21 larger than the friction torque that the second end surface portion 34 receives from the stopper portion 17. Thus, the nut member 20 and the control ring 30 are formed to rotate together.
[0037]
Specifically, the first end surface portion 32 is formed along the circumferential direction of the peripheral portion 25 of the female screw hole 21, and the second end surface portion 34 is formed along the circumferential direction of the stopper portion 17. The diameter D1 of the first end surface portion 32 is formed to be larger than the diameter D2 of the second end surface portion 34. Further, assuming that the width of the first end face portion 32 and the width of the second end face portion 34 are W1 and W2, the contact area S1 where the first end face portion 32 contacts the peripheral edge portion 25 of the female screw hole 21 (hatching in FIG. 2). The portion shown) is approximately πD1 · W1, and the contact area S2 (the portion indicated by hatching in FIG. 3) where the second end face portion 34 contacts the stopper portion 17 is approximately πD2 · W2.
[0038]
A step portion 35 is formed on the second end surface portion 34 of the control ring 30. The step portion 35 is located on the large-diameter portion of the second end surface portion 34 and is retracted from the stopper portion 17 so as not to come into contact with the stopper portion 17. As a result, the portion of the second end surface portion 34 that comes into contact with the stopper portion 17 has a small diameter. Further, on the inner peripheral surface 37 of the control ring 30, there are a first inner peripheral surface 37a and a second inner peripheral surface 37b so as to be fitted around the male screw 13 and its neck portion 13a (portion having a smaller diameter than the male screw 13). Is formed.
[0039]
Next, the operation of the present embodiment will be described.
One end portion of the tube material T is inserted into the female screw hole 21 through the insertion hole 24 of the nut member 20, and the outer diameter fitting portion T <b> 2 at one end portion of the tube material T is the distal end portion 11 of the joint body 10. The part 12 is externally fitted. A stepped portion T3 applied to the expanded diameter portion T2 in a state of being expanded from the general outer diameter portion T1 of the tube material T extends obliquely along the chamfered slope portion 19 of the fitted portion 12 of the joint body 10. When the distal end portion 11 of the joint main body 10 is inserted into the inner side of the female screw hole 21 of the nut member 20, the start end of the male screw 13 of the joint main body 10 comes into contact with the start end of the female screw portion 23 of the nut member 20. At this time, the enlarged diameter portion T2 of the tube material T is formed in the female screw hole 21 of the nut member 20 (the screw thread of the female screw portion 23 or the inner peripheral wall 21a of the female screw hole 21) through a slight gap or the female screw hole. It is relatively inserted through sliding contact with 21.
[0040]
When the tightening tool is fitted into the tightened portion 27 of the nut member 20 and the tightening tool is similarly fitted into the stopper portion 17 of the joint body 10 and these are rotated relatively, the joint body 10 The female screw portion 23 of the nut member 20 is screwed into the male screw 13. In a state in which the female screw portion 23 of the nut member 20 is completely screwed to the male screw 13 of the joint body 10, the biting portion 22a of the back wall 22 of the nut member 20 bites into the step portion T3 of the tube material T, and the tube material T Omission can be prevented. Furthermore, since the tube material T and the chamfered slope portion 19 of the joint body 10 are pressed against each other, high airtightness can be obtained.
[0041]
One end portion of the tube material T is inserted into the female screw hole 21 of the nut member 20, one end portion of the tube material T is externally fitted to the joint main body 10, and the female screw of the nut member 20 is fastened to the male screw 13 of the joint main body 10. Thus, one end of the tube material T is supported. The control ring 30 is fitted on the male screw 13 of the joint body 10.
[0042]
Before the nut member 20 is tightened, the open portion 39 of the control ring 30 is externally fitted to the male screw 13 from the direction orthogonal to the screw axis of the male screw 13 of the joint body 10. Next, when the female screw portion 23 of the nut member 20 is tightened into the male screw 13 of the joint body 10, the control ring 30 is sandwiched between the stopper portion 17 of the joint body 10 and the peripheral edge of the female screw hole 21 of the nut member 20. Eventually, the first end surface portion 32 of the control ring 30 comes into contact with the peripheral edge portion 25 of the female screw hole 21 of the nut member 20, and the second end surface portion 34 of the control ring 30 contacts the stopper portion 17 of the joint body 10. Will come into contact.
[0043]
When the nut member 20 is tightened, the friction torque that the first end surface portion 32 receives from the peripheral portion 25 of the female screw hole 21 is larger than the friction torque that the second end surface portion 34 receives from the stopper portion 17. The ring 30 rotates together, and the tightening strength of the nut member 20 is in an appropriate state.
[0044]
Specifically, since the diameter of the first end surface portion 32 is formed to be larger than that of the second end surface portion 34, the first reaction force that the first end surface portion 32 receives from the peripheral edge portion 25 of the female screw hole 21. Will act at a position farther from the center of rotation of the control ring 30 than the second reaction force received by the second end face portion 34 from the stopper portion 17.
[0045]
The first reaction force and the second reaction force are F1 and F2, and the distance from the rotation center of the control ring 30 to the position where each reaction force F1 and F2 acts is R1 and R2, and the first end face portion 32 and the second end face If both the friction coefficients related to the part 34 are μ, the friction torque based on the first reaction force is ΣμF1 · R1, and the friction torque based on the second reaction force is ΣμF2 · R2.
[0046]
Here, the friction coefficient μ is a static friction coefficient, and the friction torque based on the first reaction force F1 is the center of the control ring 30 and the first reaction force F1 that the first end surface portion 32 receives from the peripheral edge portion 25 of the female screw hole 21. The friction torque based on the second reaction force F2 is the sum of products of the distance R1 from the (rotation center) to the portion that receives the first reaction force F1, and the second reaction force at which the second end surface portion 34 contacts the stopper 17 This is the sum of products of F2 and the distance R2 from the center of the control ring 30 to the portion that receives the second reaction force F2.
[0047]
When the nut member 20 is tightened, the first reaction force and the second reaction force are the same due to the relationship between the action and the reaction (F1 = F2), and since R1> R2, The friction torque based on (ΣμF1 · R1) becomes larger than the friction torque based on the second reaction force (ΣμF2 · R2), and the second end face portion 34 starts to slide with respect to the stopper portion 17 first. At the time of tightening, the nut member 20 and the control ring come to rotate together.
[0048]
After confirming the joint state of the nut member 20 and the control ring 30, if the tightening operation of the nut member 20 is completed, an appropriate initial tightening position of the nut member 20 can be determined. 20 tightening operations can be performed easily and reliably. Further, it is possible to prevent problems due to insufficient tightening or excessive tightening of the nut member 20, and in particular, it is possible to prevent damage to the joint body 10 due to excessive tightening of the nut member 20.
[0049]
Further, when the nut member 20 and the control ring 30 rotate together, the open portion 39 of the control ring 30 serves as a mark, and the nut member 20 and the open portion 39 of the control ring 30 rotate together, It becomes clear how much the nut member 20 and the control ring 30 have rotated together, whereby the nut member 20 can be tightened more reliably.
[0050]
After the nut member 20 has been tightened, the tube joint can be used, but the force to support the tube material may decrease over a long period of time. In order to prevent a decrease in the supporting force, the tube joint may be used for a predetermined period. It is necessary to retighten the nut member 20 after use. When the nut member 20 is tightened, the control ring 30 needs to be removed from the male screw 13 of the joint body 10. At this time, if the male screw 13 of the joint body 10 is relatively passed through the gap between the open portions 39 of the control ring 30, the control ring 30 can be easily extracted from the male screw 13 of the joint body 10.
[0051]
On the other hand, when the nut member 20 is tightened, a control ring 30 for additional tightening may be interposed in the gap between the nut member 20 and the stopper 17. Even when the nut member 20 is tightened, the nut member 20 and the control ring 30 are always set to rotate together.
[0052]
In the embodiment, the nut member 20 and the control ring 30 always rotate together by making the diameter of the first end surface portion 32 of the control ring 30 larger than that of the second end surface portion 34. However, if the friction coefficients related to the first end surface portion 32 and the second end surface portion 34 are μ1 and μ2 (μ1> μ2), respectively, the friction based on the first reaction force is assumed even if R1 = R2. The torque (Σμ1, F1, R1) is larger than the friction torque (Σμ2, F2, R2) based on the second reaction force, so that when the nut member 20 is tightened, the nut member 20 and the control ring rotate together. To come.
[0053]
Further, as shown in FIGS. 4 to 6, mark portions may be continuously provided on the outer peripheral edge 38 of the control ring 30 at a predetermined interval in the circumferential direction. Specifically, the outer periphery of the first end surface portion 32 is formed on the outer peripheral edge 38 whose diameter is larger than the outer diameter of the nut member 20, and is a notch that is a mark portion at predetermined intervals in the circumferential direction of the outer peripheral edge 38. 36 may be provided continuously.
[0054]
When the nut member 20 and the control ring 30 rotate together, the notch 36 rotates integrally with the control ring 30. Specifically, the notch 36 changes from the state before the co-rotation shown in FIG. 6 (a) to the state after the co-rotation shown in FIG. 6 (b). By looking at the degree of rotation of the notch 36 (an angle of about 45 degrees in FIG. 6), it is possible to easily confirm how much the nut member 20 and the control ring 30 have rotated together. Further, by providing the notch 36 on the outer peripheral edge 38 larger than the outer diameter of the nut member 20, the notch 36 becomes conspicuous without being shaded by both the nut member 20 and the stopper portion 17, and the degree of co-rotation Can be easily confirmed.
[0055]
7 and 8 are modifications of the above embodiment, FIG. 7 is a front view of the control ring, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 9 and 10 are other modifications of the above embodiment, and a front view of the control ring, and FIG. 10 is a sectional view taken along line XX of FIG.
[0056]
As shown in FIGS. 7 to 10, the stepped portion 35 is not formed on the second end surface portion 34 as in the above embodiment. In the control ring 30, the maximum diameters of the first end surface portion 32 and the second end surface portion 34 are substantially the same, while the minimum diameter of the second end surface portion 34 is smaller than the minimum diameter of the first end surface portion 32. It has become. As a result, the first end surface portion 32 of the control ring 30 concentrates on the second end surface portion 34 the first reaction force F1 received from the peripheral edge portion 25 of the female screw hole 21 at the large diameter portion of the first end surface portion 32. To receive.
[0057]
As a result, the friction torque based on the first reaction force becomes larger than the friction torque based on the second reaction force, and the second end surface portion 34 starts to slide first with respect to the stopper portion 17, and the nut member 20 is tightened when the nut member 20 is tightened. The member 20 and the control ring come to rotate together.
[0058]
【The invention's effect】
As described above, in the tube material joint according to the present invention, when the nut member is tightened, the friction torque received by the first end surface portion of the control ring from the peripheral edge portion of the female screw hole of the nut member is second in the control ring. Since the end face part is made larger than the friction torque received from the stopper part of the joint body, the nut member and the control ring can reliably rotate together at the final stage of tightening of the nut member. The initial tightening position can be determined, the workability of tightening the nut can be improved, and damage to the joint body can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a tube material joint according to an embodiment of the present invention.
FIG. 2 is an arrow view when the control ring according to the embodiment of the present invention is viewed from the II direction of FIG.
FIG. 3 is an arrow view when the control ring according to the embodiment of the present invention is viewed from the III direction in FIG. 1;
FIG. 4 is a front view of a control ring according to another embodiment of the present invention.
5 is a cross-sectional view taken along line VV in FIG.
FIGS. 6A and 6B are explanatory diagrams showing a state before and after the control ring according to another embodiment of the present invention rotates together, in which FIG. 6A shows a state before the rotation, and FIG. Indicates the state.
FIG. 7 is a front view of a control ring according to a modification of the embodiment of the present invention.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
FIG. 9 is a front view of a control ring according to another modification of the embodiment of the present invention.
10 is a cross-sectional view taken along line XX of FIG.
[Explanation of symbols]
S1 ... contact area
S2 ... contact area
T ... Tube material
T1 ... General outer diameter part
T2 ... Diameter expansion part
T3: Stepped part
10 ... Fitting body
11 ... tip
12 ... covered part
13 ... Male thread
13a ... neck
14 ... through hole
15 ... Mouth edge
17 ... Stopper
19a ... chamfered slope
20 ... Nut member
21 ... Female screw hole
21a ... inner wall of the hole
22 ... Back wall
22a ... bite
23 ... Female thread
24 ... insertion hole
27 ... Tightened part
30 ... Control ring
32 ... 1st end surface part
34 ... 2nd end surface part
35 ... Step
36 ... Notch
37 ... Inner surface
37a ... first inner peripheral surface
37b ... 2nd inner peripheral surface
38 ... Outer rim
39 ... Open part

Claims

One end of the tube material inserted into the female screw hole of the nut member is externally fitted to the joint main body, and the female screw of the nut member is tightened to the male screw of the joint main body to support one end of the tube material. In tube material joints,
A stopper portion which is a circumferential flange formed on the inner side of the male screw of the joint body and the periphery of the female screw hole of the nut member which is externally fitted to the male screw of the joint body and is tightened with the nut member It is equipped with a control ring made of synthetic resin that can adjust the tightening strength of the nut member by being sandwiched by the part,
When the nut member is tightened, the control ring comes into contact with a peripheral portion of the female screw hole of the nut member, and a first end surface portion formed along a circumferential direction of the peripheral portion, and the joint body It is formed to have a smaller diameter than the first end face portion with a step portion that does not come into contact with the stopper portion, contacts the stopper portion, and along the circumferential direction of the stopper portion so as to have a smaller diameter than the stopper portion. A second end surface portion to be formed, and the inner peripheral surface of the control ring is externally fitted to the male thread and the neck portion of the joint body,
The diameter of the first end surface portion is formed to be larger than the diameter of the second end surface portion, and the width of the first end surface portion is larger than the width of the second end surface portion due to the stepped portion. The contact area where the first end face part contacts the peripheral edge of the female screw hole is larger than the contact area where the second end face part contacts the stopper part,
Due to the size relationship of the contact area, the first end surface portion has a friction coefficient between the first end surface portion and the peripheral portion of the female screw hole, and a friction coefficient between the second end surface portion and the stopper portion. By making it larger, the nut member and the control ring are formed to rotate together when the nut member is tightened, and proper tightening strength can be obtained by confirming the joint rotation of the control ring. A tube material joint characterized in that it is configured as described above.

One end of the tube material inserted into the female screw hole of the nut member is externally fitted to the joint main body, and the female screw of the nut member is tightened to the male screw of the joint main body to support one end of the tube material. In tube material joints,
A stopper portion which is a circumferential flange formed on the inner side of the male screw of the joint body and the periphery of the female screw hole of the nut member which is externally fitted to the male screw of the joint body and is tightened with the nut member It is equipped with a control ring made of synthetic resin that can adjust the tightening strength of the nut member by being sandwiched by the part,
When the nut member is tightened, the control ring comes into contact with a peripheral portion of the female screw hole of the nut member, and a first end surface portion formed along a circumferential direction of the peripheral portion, and the joint body It is formed to have a smaller diameter than the first end face portion with a step portion that does not come into contact with the stopper portion, contacts the stopper portion, and along the circumferential direction of the stopper portion so as to have a smaller diameter than the stopper portion. A second end surface portion to be formed, and the inner peripheral surface of the control ring is externally fitted to the male thread and the neck portion of the joint body,
The diameter of the first end surface portion is formed to be larger than the diameter of the second end surface portion, and the width of the first end surface portion is larger than the width of the second end surface portion due to the stepped portion. The contact area where the first end face part contacts the peripheral edge of the female screw hole is larger than the contact area where the second end face part contacts the stopper part,
Due to the size relationship of the contact area, when the nut member is tightened, the friction torque received from the peripheral portion of the female screw hole is made larger than the friction torque received from the stopper portion, so that the nut member and the control ring can be used together. Formed to rotate,
On the outer peripheral edge of the control ring, mark portions are continuously provided at predetermined intervals in the circumferential direction of the outer peripheral edge, and it is configured to obtain an appropriate tightening strength by visually confirming the joint rotation of the control ring. This is a tube joint.

The first end surface portion is formed along a circumferential direction of a peripheral portion of the female screw hole,
The second end surface portion is formed along a circumferential direction of the stopper portion,
The first end surface portion has a sum of products of a first reaction force that the first end surface portion receives from a peripheral portion of the female screw hole and a distance from a center of the control ring to a portion that receives the first reaction force, The second end surface portion is formed so as to be larger than a sum of products of a second reaction force in contact with the stopper and a distance from a center of the control ring to a portion receiving the second reaction force. The joint of the tube material according to claim 1 or 2.

The outer peripheral edge of the control ring is formed such that the diameter of the outer peripheral edge is larger than the outer diameter of the nut member,
The joint of the tube material according to claim 2, wherein the mark portion is a notch formed in an outer peripheral edge of the control ring.