JP2004225833A

JP2004225833A - Joint for tube material

Info

Publication number: JP2004225833A
Application number: JP2003015744A
Authority: JP
Inventors: Shiyoushiyun Go; 少春呉; Takanori Suzuki; 貴紀鈴木
Original assignee: Flowell Corp
Current assignee: Flowell Corp
Priority date: 2003-01-24
Filing date: 2003-01-24
Publication date: 2004-08-12

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint for a tube material, allowing easy visual confirmation of the existence or not of liquid leakage. <P>SOLUTION: The joint comprises a detection ring 30 externally fitted to a male screw 13 of a joint body 10 or to the corner side of the male screw 13 so as to externally face an inlet 21a of a female screw hole 21 of a nut member 20. For example, when the tightening force of the nut member 20 is lowered and the air tightness of a flow path F1 is lowered to cause the leakage of liquid from the flow path through a gap between the male screw 13 and a female screw 23 to the inlet 21a of the female screw hole 21, the liquid permeates through the detection ring 30 arranged facing the inlet 21a of the female screw hole 21 and the detecting component of the detection ring 30 reacts with the liquid to discolor the detection ring 30. <P>COPYRIGHT: (C)2004,JPO&NCIPI

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、継手本体の雄ねじにナット部材の雌ねじを締め込むことで、チューブ材の一端部を継手本体に圧嵌させ、チューブ材と継手本体との間の流路の気密性を高め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】
チューブ材の継手などからの液漏れを検知する場合、人の手作業としてリトマス試験紙を用い、継手を１個ずつ検査するようにしていた。
【０００３】
また、継手に漏水検知装置を取り付け、漏水検知装置から受信盤８に検知線７を引き、さらに、受信盤８から管理室の受信盤１１に信号線を引いたり、受信盤８の受けた信号によって警報発生装置１０を作動させるようにしている（特許文献１参照。）。さらに、フランジ継手１３のシール面の隙間が塞がるように検知ケーブル１を被せ巻き付けるようにし、パッキングから滲み出るようなわずかな薬液の漏れでも検知することができるようにしたものもある（特許文献２参照。）。
【０００４】
【特許文献１】
特開平７−２６００９８号公報
【特許文献２】
特開平９−１５０７７号公報
【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、リトマス試験紙を用いるものでは、リトマス試験紙を継手に直接接触させる必要があるので、手の届かない継手の検査ができない。また、手の届きにくい継手の検査作業が困難になるという問題点がある。
また、特許文献１の技術および、特許文献２の技術では、検知するための検知線、信号線、検知ケーブルなどの配線や、継手からの液漏れを検知情報として処理するための電気的な装置が必要になり、装置全体が複雑になり、コストが嵩むという問題もある。
【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、継手から漏れ出す液に反応して変色する検知リングを備え、液漏れの有無を目視で簡単に確認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、継手本体（１０）の雄ねじ（１３）にナット部材（２０）の雌ねじ（２３）を締め込むことで、チューブ材（Ｔ）の一端部を継手本体（１０）に圧嵌させ、チューブ材（Ｔ）と継手本体（１０）との間の流路（Ｆ１）の気密性を高めるようにしたものであり、検知リング（３０）を備えたチューブ材（Ｔ）の継手において、
前記検知リング（３０）は、前記ナット部材（２０）の雌ねじ孔（２１）の入口（２１ａ）を外部から臨むように、前記雄ねじ（１３）または該雄ねじ（１３）の奥側に外嵌し、
さらに、前記検知リング（３０）は、前記流路（Ｆ１）から前記雌ねじ孔（２１）の入口（２１ａ）へ漏れ出してくる液体に反応して変色することで液漏れを検知するための検出用成分を有する
ことを特徴とするチューブ材（Ｔ）の継手。
【０００８】
［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、継手本体（１０）の雄ねじ（１３）にナット部材（２０）の雌ねじ（２３）を締め込むことで、チューブ材（Ｔ）の一端部を継手本体（１０）に圧嵌させ、チューブ材（Ｔ）と継手本体（１０）との間の流路（Ｆ１）の気密性を高めるようにしたものであり、コントロールリング（４０）と、検知リング（３０）とを備えたチューブ材（Ｔ）の継手において、
前記継手本体（１０）は、前記雄ねじ（１３）の奥側に円周形状のフランジであるストッパ部（１７）を備え、
前記コントロールリング（４０）は、前記継手本体（１０）の雄ねじ（１３）に外嵌していて、前記ストッパ部（１７）と前記ナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）とに挟まれるように配されることで、前記ナット部材（２０）の締め込み強度を調整可能なものであり、
さらに、前記コントロールリング（４０）は、外部から該コントロールリング（４０）を通して前記検知リング（３０）を見ることができるように透光性を有し、
前記検知リング（３０）は、前記ナット部材（２０）の雌ねじ孔（２１）の入口（２１ａ）を外部から臨むように、前記継手本体（１０）の雄ねじ（１３）あるいは該雄ねじ（１３）の奥側に外嵌し、
さらに、前記検知リング（３０）は、前記流路（Ｆ１）から前記雌ねじ孔（２１）の入口（２１ａ）へ漏れ出してくる液体に反応して変色することで液漏れを検知するための検出用成分を有する
ことを特徴とするチューブ材（Ｔ）の継手。
【０００９】
［３］前記検知リング（３０）は、前記液体に反応して変色する試液を高分子多孔体に含浸させたものである
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。
【００１０】
［４］前記検知リング（３０）は、前記コントロールリング（４０）と一体的に形成されている
ことを特徴とする［２］または［３］に記載のチューブ材（Ｔ）の継手。
【００１１】
［５］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、継手本体（１０）の雄ねじ（１３）にナット部材（２０）の雌ねじ（２３）を締め込むことで、チューブ材（Ｔ）の一端部を継手本体（１０）に圧嵌させ、チューブ材（Ｔ）と継手本体（１０）との間の流路（Ｆ１）の気密性を高めるようにしたものであり、コントロールリング（４０）を備えたチューブ材（Ｔ）の継手において、
前記継手本体（１０）は、前記雄ねじ（１３）の奥側に円周形状のフランジであるストッパ部（１７）を備え、
前記コントロールリング（４０）は、前記継手本体（１０）の雄ねじ（１３）に外嵌していて、前記ストッパ部（１７）と前記ナット部材（２０）の雌ねじ孔（２１）の入口（２１ａ）の周縁部（２５）とに挟まれるように配されることで、前記ナット部材（２０）の締め込み強度を調整可能なものであり、
さらに、前記コントロールリング（４０）は、外部から該コントロールリング（４０）の内周面（４７）を見ることができるように透光性を有し、
前記コントロールリング（４０）の内周面（４７）には、前記流路（Ｆ１）から前記雌ねじ孔（２１）の入口（２１ａ）へ漏れ出してくる液体に反応して変色する試液が塗布されている
ことを特徴とするチューブ材（Ｔ）の継手。
【００１２】
［６］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、継手本体（１０）の雄ねじ（１３）にナット部材（２０）の雌ねじ（２３）を締め込むことで、チューブ材（Ｔ）の一端部を継手本体（１０）に圧嵌させ、チューブ材（Ｔ）と継手本体（１０）との間の流路（Ｆ１）の気密性を高めるようにしたものであり、コントロールリング（４０）を備えたチューブ材（Ｔ）の継手において、
前記継手本体（１０）は、前記雄ねじ（１３）の奥側に円周形状のフランジであるストッパ部（１７）を備え、
前記コントロールリング（４０）は、前記継手本体（１０）の雄ねじ（１３）に外嵌していて、前記ストッパ部（１７）と前記ナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）とに挟まれるように配されることで、前記ナット部材（２０）の締め込み強度を調整可能なものであり、
さらに、前記コントロールリング（４０）は、外部から該コントロールリング（４０）を通して前記継手本体（１０）の雄ねじ（１３）を見ることができるように透光性を有し、
前記継手本体（１０）の雄ねじ（１３）は、前記雌ねじ孔（２１）の入口（２１ａ）を外部から臨む位置（１８）に、前記流路（Ｆ１）から前記雌ねじ孔（２１）の入口（２１ａ）へ漏れ出してくる液体に反応して変色する試液が塗布されている
ことを特徴とするチューブ材（Ｔ）の継手。
【００１３】
次に本発明の作用を説明する。
検知リング（３０）を備え、検知リング（３０）がナット部材（２０）の雌ねじ孔（２１）の入口（２１ａ）を外部から臨むように、継手本体（１０）の雄ねじ（１３）あるいは雄ねじ（１３）の奥側に外嵌しているものでは、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、差し込んだチューブ材（Ｔ）の一端部を継手本体（１０）に外嵌する。次に、継手本体（１０）の雄ねじ（１３）にナット部材（２０）の雌ねじ（２３）を締め込む。それによって、チューブ材（Ｔ）の一端部を継手本体（１０）に圧嵌させることができ、チューブ材（Ｔ）と継手本体（１０）との間の流路（Ｆ１）の気密性を高めることができる。そのような気密性の高い流路（Ｆ１）においては、液体が流路（Ｆ１）からナット部材（２０）の雌ねじ孔（２１）の入口（２１ａ）に漏れ出てくることはない。したがって、流路（Ｆ１）内の液体が、雌ねじ孔（２１）の入口（２１ａ）を臨んで配された検知リング（３０）に浸透することはなく、検知リング（３０）の有する検出用成分に液体が反応する場合がなく、検知リング（３０）が変色することもない。
【００１４】
ナット部材（２０）の締め付け力が低下すると、流路（Ｆ１）の気密性が低下し、液体が流路（Ｆ１）から雄ねじ（１３）と雌ねじ（２３）との間の隙間を通って雌ねじ孔（２１）の入口（２１ａ）に漏れ出てくる。漏れ出した液体は、雌ねじ孔（２１）の入口（２１ａ）を臨んで配された検知リング（３０）に浸透する。それによって、検知リング（３０）の有する検出用成分が液体に反応し、検知リング（３０）が変色するようになる。
【００１５】
コントロールリング（４０）と、検知リング（３０）とを備え、コントロールリング（４０）が継手本体（１０）の雄ねじ（１３）に外嵌していて、ストッパ部（１７）とナット部材（２０）の雌ねじ孔（２１）の周縁部（２５）とに挟まれるように配されることで、ナット部材（２０）の締め込み強度を調整可能なものであり、さらに、コントロールリング（４０）が外部からコントロールリング（４０）を通して雌ねじ孔（２１）の入口（２１ａ）あるいは入口（２１ａ）近傍を見ることができるように透光性を有しているものでは、例えば、コントロールリング（４０）が雌ねじ孔（２１）の周縁部（２５）から受ける摩擦トルクは、コントロールリング（４０）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、コントロールリング（４０）が形成されていて、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（４０）とが共回りするようになる。こ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）の締め込みが適正なものになる。
【００１６】
このようなコントロールリング（４０）を備えたものにおいて、ナット部材（２０）の締め付け力が低下すると、流路（Ｆ１）の気密性が低下し、液体が流路（Ｆ１）から雄ねじ（１３）と雌ねじ（２３）との間の隙間を通って雌ねじ孔（２１）の入口（２１ａ）に漏れ出てくる。漏れ出した液体は、雌ねじ孔（２１）の入口（２１ａ）を臨んで配された検知リング（３０）に浸透する。それによって、検知リング（３０）が有する検出用成分に液体が反応し、検知リング（３０）が変色するようになる。コントロールリング（４０）は透光性を有しているので、変色した検知リング（３０）をコントロールリング（４０）を通して視認することができる。
【００１７】
検知リング（３０）が試液を高分子多孔体に含浸させたものでは、試液としては、塩化コバルト、酢酸コバルトなどが用いられる。例えば、漏れだした液体（純水洗浄液）と塩化コバルトとが混ざると、検知リング（３０）が青色から無色あるいは薄い桃色になる。
【００１８】
検知リング（３０）とコントロールリング（４０）とを一体的に形成してもよい。また、コントロールリング（４０）の内周面（４７）に試液を塗布してもよい。さらに、継手本体（１０）の雄ねじ（１３）が、雌ねじ孔（２１）の入口（２１ａ）を外部から臨む位置（１８）に試液を塗布するようにしてもよい。
【００１９】
【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。図１〜図３は本発明の一実施の形態を示している。図１はチューブ材の継手の要部断面図、図２は図１のＩＩ−ＩＩ線断面図、図３は同じく、チューブ材の継手の要部断面図であって、主に、流路から液体が漏れる順路を破線で表した図である。
【００２０】
図１および図２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。
【００２１】
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の奥側にねじ軸に略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の孔内周壁２１ｂ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。
【００２２】
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。
【００２３】
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２１ｂ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。
【００２４】
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。
【００２５】
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。
【００２６】
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。
【００２７】
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２１ａ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。
【００２８】
継手本体１０の雄ねじ１３にナット部材２０の雌ねじ部２３を締め込むことで、ナット部材２０の食い込み部２２ａが、継手本体１０の面取り傾斜部１９に食い込むことで、チューブ材Ｔの一端部を継手本体１０に圧嵌させ、チューブ材Ｔと継手本体１０との間の流路Ｆ１の気密性を高めるようになっている。
【００２９】
検知リング３０は液漏れを検知するための検出用成分を有している。検知リング３０は、ナット部材２０の雌ねじ孔２１の入口２１ａを外部から臨むように、継手本体１０の雄ねじ１３あるいは雄ねじ１３の奥側に外嵌している。検知リング３０は、雄ねじ１３とコントロールリング４０との間でがたつかないように、その内径部３１が雄ねじ１３のねじ山径とほぼ同じ径になっていて、その外径部３２がコントロールリング４０の内径とほぼ同じ径になっている。
【００３０】
検出用成分は、流路Ｆ１から前記雌ねじ孔２１の入口２１ａへ漏れ出してくる液体に反応して変色するものである。検知リング３０は、高分子多孔体に検出用成分である試液を含浸させたものである。試液であるポリエチレングリコール６０００と塩化コバルトとの混合水溶液を高分子多孔体に含浸させた後に、１２５度で１０分間乾燥する。それによって、検知リング３０は青色のものになる。
【００３１】
塩化コバルトの他に、水和物並びに、潮解性または吸湿性を有する物質であって、液体に反応して変色し、かつ、試液として安定した性質を有するものであればどのようなものであってもよい。また、塩化コバルトの代わりに、例えばブロモチモールブルーなどの指示薬を使えば、特定な薬液を検知することができる。
【００３２】
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４０が外嵌している。コントロールリング４０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４９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４０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。
【００３３】
コントロールリング４０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。コントロールリング４０は、外部から該コントロールリング４０を通して検知リング３０を見ることができるように透光性を有している。
【００３４】
コントロールリング４０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４２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４４とを有している。
【００３５】
第１端面部４２は、ナット部材２０の締め込み時に、第１端面部４２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４４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４０とが共回りするように形成されている。具体的には、コントロールリング４０の第１端面部４２、第２端面部４４に係る摩擦係数をそれぞれμ１、μ２（μ１＞μ２）とすることで、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。
【００３６】
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。
【００３７】
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２１ｂ）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。
【００３８】
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。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４０の開いた部分４９をその雄ねじ１３に外嵌しておく。
【００３９】
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４０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４０の第１端面部４２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４０の第２端面部４４が接触するようになる。
【００４０】
このナット部材２０の締め込み時に、第１端面部４２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４４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４０とが共回りするようになる。そ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を適度に締め込んだ状態になる。
【００４１】
ナット部材２０を適度に締め込んだ状態では、ナット部材２０の奥壁２２の食込み部２２ａが、チューブ材Ｔの段差部Ｔ３に適正に食い込むことで、チューブ材Ｔの抜けを防止することができるとともに、チューブ材Ｔの段差部Ｔ３を継手本体１０の面取り傾斜部１９に圧嵌させて、チューブ材Ｔと継手本体１０との間の流路Ｆ１の高い気密性を得ることができる。高い気密性を有する流路Ｆ１においては、液体が流路Ｆ１から雌ねじ孔２１の入口２１ａに漏れ出すことはなく、外部から入口２１ａを臨んで配された検知リング３０に液体が浸透することはなく、検出用成分が液体に反応する場合はなく、検知リング３０が変色することもない。
【００４２】
ナット部材２０の締め付け力が低下すると、流路Ｆ１の気密性が低下し、図３に液体が漏れ出す順路を破線Ｆ２で示したように、液体が、継手本体１０の面取り傾斜部１９とチューブ材Ｔの段差部Ｔ３との間の隙間〜継手本体１０の被外嵌部１２とチューブ材Ｔの拡径部Ｔ２との間の隙間〜継手本体１０の雄ねじ１３とナット部材２０の雌ねじ２３との間の隙間を通って、雌ねじ孔２１の入口２１ａに漏れ出てくる。漏れ出した液体は、雌ねじ孔２１の入口２１ａを臨んで配された検知リング３０に浸透する。
【００４３】
それによって、検知リング３０の有する検出用成分が液体に反応し、検知リング３０が変色するようになる。コントロールリング４０は透光性を有しているので、変色した検知リング３０を外部からコントロールリング４０を通して視認することができる。検知リング３０が高分子多孔体に試液を含浸させ、試液として、塩化コバルトを用いた場合、漏れ出した液体（純水洗浄液）と塩化コバルトとが混ざると、検知リング３０が青色から無色あるいは薄い桃色になる。それにより、液漏れを目視で簡単に検出することができる。
【００４４】
前記実施の形態においては、検知リング３０とコントロールリング４０とが別体のものを示したが、検知リング３０とコントロールリング４０とを樹脂金型を用いて一体的に形成してもよい。また、検知リング３０にコントロールリング４０を嵌め込むようにすることで、検知リング３０とコントロールリング４０とを一体的に扱うことができるようにしてもよい。
【００４５】
さらに、図４に示すように、コントロールリング４０の内周面４１に、流路Ｆ１から雌ねじ孔２１の入口２１ａへ漏れ出してくる液体に反応して変色する試液を塗布してもよく、また、継手本体１０の雄ねじ１３が、雌ねじ孔２１の入口２１ａを外部から臨む位置１８（図１で示す雄ねじ１３あるいは雄ねじ１３の奥側）に試液を塗布するようにしてもよい。さらに、試液を塗布したシートをコントロールリング４０の内周面４７や雄ねじ１３に貼着してもよい。この場合、コントロールリング４０は、外部からコントロールリング４０の内周面４７を見ることができるように透光性を有している。また、コントロールリング４０は、外部から該コントロールリング４０を通して継手本体１０の雄ねじ１３を見ることができるように透光性を有している。
【００４６】
【発明の効果】
本発明に係るチューブ材の継手によれば、検知リングを備え、検知リングがナット部材の雌ねじ孔の入口を外部から臨むように、継手本体の雄ねじあるいは雄ねじの奥側に外嵌しているので、例えば、ナット部材の締め付け力が低下して、流路の気密性が低下し、液体が流路から雄ねじと雌ねじとの間の隙間を通って雌ねじ孔の入口に漏れ出てくると、雌ねじ孔の入口を臨んで配された検知リングに液体が浸透し、検知リングの有する検出用成分が液体に反応することで、検知リングが変色するようになり、液漏れの有無を目視で簡単に確認することができる。
【００４７】
また、コントロールリングと検知リングとを備え、コントロールリングが透光性を有しているので、変色した検知リングをコントロールリングを通して視認することができる。さらに、検知リングとコントロールリングとを一体的に形成したので、部品点数が削減され、組立工数が少なくなり、コストを低減することができる。さらに、コントロールリングの内周面に試液を塗布し、あるいは、継手本体の雄ねじにおいて雌ねじ孔の入口を外部から臨む位置に試液を塗布したので、さらに、コストを低減することができる。
【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】図１のＩＩ−ＩＩ線断面図である。
【図３】同じく、チューブ材の継手の要部断面図であって、主に、流路から液体が漏れる順路を破線で表した図である。
【図４】本発明の他の実施の形態に係るチューブ材の継手を流路に直交する方向から破断して示した断面図である。
【符号の説明】
Ｆ１…流路
Ｆ２…液体が漏れる順路
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…雌ねじ孔の入口
２１ｂ…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…検知リング
３１…内径部
３２…外径部
４０…コントロールリング
４２…第１端面部
４４…第２端面部
４７…内周面[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, one end of a tube material inserted into a female screw hole of a nut member is externally fitted to the joint body, and the female screw of the nut member is tightened into a male screw of the joint body, thereby connecting one end of the tube material to the joint body. The present invention relates to a joint of a tube material that is press-fitted to the tube material so as to increase the airtightness of a flow path between the tube material and the joint body. In particular, the present invention relates to a resin joint of a tube material for controlling a flow pipe of a pure water cleaning solution, a chemical solution, and the like used in a clean room at a manufacturing site of high-density semiconductor chips.
[0002]
[Prior art]
When detecting a liquid leak from a joint or the like of a tube material, a litmus test paper is used as a manual operation by a person, and each joint is inspected one by one.
[0003]
In addition, a water leak detecting device is attached to the joint, a detection line 7 is drawn from the water leak detecting device to the receiving panel 8, and a signal line is drawn from the receiving panel 8 to the receiving panel 11 in the control room, or a signal received by the receiving panel 8 is received. The alarm generating device 10 is operated by this (see Patent Document 1). Further, there is also a structure in which the detection cable 1 is covered and wound so as to close the gap between the sealing surfaces of the flange joint 13 so that even a slight leakage of a chemical solution that oozes out of the packing can be detected (Patent Document 2). reference.).
[0004]
[Patent Document 1]
JP-A-7-260098
[Patent Document 2]
JP-A-9-15077
[0005]
[Problems to be solved by the invention]
However, in such a conventional joint made of a tube material, when a litmus test paper is used, it is necessary to directly contact the litmus test paper with the joint, so that an unreachable joint cannot be inspected. In addition, there is a problem that inspection work of a joint which is difficult to reach becomes difficult.
Further, in the technology of Patent Document 1 and the technology of Patent Document 2, an electrical device for processing wiring such as a detection line, a signal line, a detection cable, and the like, and processing liquid leakage from a joint as detection information. Is required, and there is also a problem that the entire apparatus becomes complicated and the cost increases.
[0006]
The present invention has been made in view of such problems of the conventional technology, and includes a detection ring that changes its color in response to a liquid leaking from a joint, so that the presence or absence of a liquid leak can be easily confirmed visually. It is an object of the present invention to provide a tube joint that can be used.
[0007]
[Means for Solving the Problems]
The gist of the present invention to achieve this object lies in the inventions in the following items.
[1] One end of the tube material (T) inserted into the female screw hole (21) of the nut member (20) is externally fitted to the joint body (10), and a nut is attached to the male screw (13) of the joint body (10). By tightening the female screw (23) of the member (20), one end of the tube material (T) is pressed into the joint body (10), and the flow between the tube material (T) and the joint body (10) is reduced. The airtightness of the road (F1) is improved, and in the joint of the tube material (T) provided with the detection ring (30),
The detection ring (30) is externally fitted to the male screw (13) or the back side of the male screw (13) such that the entrance (21a) of the female screw hole (21) of the nut member (20) faces the outside. ,
Further, the detection ring (30) is a detection for detecting liquid leakage by changing color in response to liquid leaking from the flow path (F1) to the inlet (21a) of the female screw hole (21). Having components for
A joint made of a tube material (T).
[0008]
[2] One end of the tube material (T) inserted into the female screw hole (21) of the nut member (20) is externally fitted to the joint body (10), and a nut is attached to the male screw (13) of the joint body (10). By tightening the female screw (23) of the member (20), one end of the tube material (T) is pressed into the joint body (10), and the flow between the tube material (T) and the joint body (10) is reduced. The joint of the tube material (T) including the control ring (40) and the detection ring (30) is provided so as to enhance the airtightness of the road (F1).
The joint body (10) includes a stopper (17) that is a circumferential flange on the back side of the male screw (13),
The control ring (40) is externally fitted to the male screw (13) of the joint body (10), and has a peripheral portion (25) of the stopper portion (17) and the female screw hole (21) of the nut member (20). ), The tightening strength of the nut member (20) can be adjusted,
Further, the control ring (40) has translucency so that the detection ring (30) can be seen from the outside through the control ring (40),
The detection ring (30) is provided with a male screw (13) of the joint body (10) or a male screw (13) of the joint main body (10) such that the inlet (21a) of the female screw hole (21) of the nut member (20) faces externally. Fit outside on the back side,
Further, the detection ring (30) is a detection for detecting liquid leakage by changing color in response to liquid leaking from the flow path (F1) to the inlet (21a) of the female screw hole (21). Having components for
A joint made of a tube material (T).
[0009]
[3] The detection ring (30) is obtained by impregnating a polymer porous body with a test solution that changes color in response to the liquid.
The joint of the tube material (T) according to [1] or [2], wherein:
[0010]
[4] The detection ring (30) is formed integrally with the control ring (40).
The joint of the tube material (T) according to [2] or [3], wherein:
[0011]
[5] One end of the tube material (T) inserted into the female screw hole (21) of the nut member (20) is externally fitted to the joint body (10), and a nut is attached to the male screw (13) of the joint body (10). By tightening the female screw (23) of the member (20), one end of the tube material (T) is pressed into the joint body (10), and the flow between the tube material (T) and the joint body (10) is reduced. The airtightness of the road (F1) is improved, and in the joint of the tube material (T) provided with the control ring (40),
The joint body (10) includes a stopper (17) that is a circumferential flange on the back side of the male screw (13),
The control ring (40) is externally fitted to the male screw (13) of the joint body (10), and the inlet (21a) of the stopper (17) and the female screw hole (21) of the nut member (20). The nut member (20) can be adjusted in tightening strength by being disposed so as to be sandwiched between the peripheral portion (25) of the nut member and the nut member (20).
Further, the control ring (40) has translucency so that the inner peripheral surface (47) of the control ring (40) can be seen from the outside,
An inner peripheral surface (47) of the control ring (40) is coated with a test liquid that changes color in response to liquid leaking from the flow path (F1) to the inlet (21a) of the female screw hole (21). ing
A joint made of a tube material (T).
[0012]
[6] One end of the tube material (T) inserted into the female screw hole (21) of the nut member (20) is externally fitted to the joint body (10), and a nut is attached to the male screw (13) of the joint body (10). By tightening the female screw (23) of the member (20), one end of the tube material (T) is pressed into the joint body (10), and the flow between the tube material (T) and the joint body (10) is reduced. The airtightness of the road (F1) is improved, and in the joint of the tube material (T) provided with the control ring (40),
The joint body (10) includes a stopper (17) that is a circumferential flange on the back side of the male screw (13),
The control ring (40) is externally fitted to the male screw (13) of the joint body (10), and has a peripheral portion (25) of the stopper portion (17) and the female screw hole (21) of the nut member (20). ), The tightening strength of the nut member (20) can be adjusted,
Further, the control ring (40) has translucency so that the external thread (13) of the joint body (10) can be seen from the outside through the control ring (40),
The male screw (13) of the joint body (10) is provided at the position (18) facing the inlet (21a) of the female screw hole (21) from the outside from the channel (F1) to the inlet of the female screw hole (21). A test liquid that changes color in response to the liquid leaking to 21a) is applied.
A joint made of a tube material (T).
[0013]
Next, the operation of the present invention will be described.
A male thread (13) or a male thread (13) of the joint body (10) is provided so as to have a detection ring (30) so that the detection ring (30) faces the entrance (21a) of the female screw hole (21) of the nut member (20) from the outside. 13), one end of the tube material (T) is inserted into the female screw hole (21) of the nut member (20), and one end of the inserted tube material (T) is connected to a joint. Externally fitted to the main body (10). Next, the female screw (23) of the nut member (20) is screwed into the male screw (13) of the joint body (10). Thereby, one end of the tube material (T) can be press-fitted to the joint body (10), and the airtightness of the flow path (F1) between the tube material (T) and the joint body (10) is improved. be able to. In such a highly airtight channel (F1), the liquid does not leak from the channel (F1) to the inlet (21a) of the female screw hole (21) of the nut member (20). Therefore, the liquid in the flow path (F1) does not penetrate into the detection ring (30) arranged facing the inlet (21a) of the female screw hole (21), and the detection component of the detection ring (30) has There is no case where the liquid reacts with the detection ring, and the detection ring (30) does not discolor.
[0014]
When the tightening force of the nut member (20) decreases, the airtightness of the flow path (F1) decreases, and the liquid flows from the flow path (F1) through the gap between the male screw (13) and the female screw (23) and the female screw. It leaks to the entrance (21a) of the hole (21). The leaked liquid permeates into the detection ring (30) arranged facing the entrance (21a) of the female screw hole (21). Thereby, the detection component of the detection ring (30) reacts with the liquid, and the color of the detection ring (30) changes.
[0015]
The control ring (40) includes a control ring (40) and a detection ring (30). The control ring (40) is externally fitted to the external thread (13) of the joint body (10), and the stopper (17) and the nut member (20). Is arranged so as to be sandwiched between the female screw hole (21) and the periphery (25) of the female screw hole (21), so that the tightening strength of the nut member (20) can be adjusted. For example, if the control ring (40) is translucent so that the entrance (21a) or the vicinity of the entrance (21a) of the female screw hole (21) can be seen through the control ring (40), the control ring (40) may The friction torque received from the peripheral portion (25) of the hole (21) is set to be larger than the friction torque received by the control ring (40) from the stopper portion (17). Have trawl ring (40) is formed, the tightening when the nut member (20), and the nut member (20) and the control ring (40) comes to rotate together. When the co-rotating state is confirmed and the tightening operation of the nut member (20) is completed, the tightening of the nut member (20) becomes appropriate.
[0016]
In the case where the control ring (40) is provided, when the tightening force of the nut member (20) decreases, the airtightness of the flow path (F1) decreases, and the liquid flows from the flow path (F1) to the external thread (13). Leaks into the entrance (21a) of the female screw hole (21) through the gap between the female screw (23). The leaked liquid permeates into the detection ring (30) arranged facing the entrance (21a) of the female screw hole (21). As a result, the liquid reacts with the detection component of the detection ring (30), and the color of the detection ring (30) changes. Since the control ring (40) has translucency, the discolored detection ring (30) can be visually recognized through the control ring (40).
[0017]
When the detection ring (30) impregnates the test solution into the polymer porous body, cobalt chloride, cobalt acetate, or the like is used as the test solution. For example, when the leaked liquid (pure water cleaning liquid) and cobalt chloride are mixed, the detection ring (30) changes from blue to colorless or pale pink.
[0018]
The detection ring (30) and the control ring (40) may be formed integrally. Further, a test solution may be applied to the inner peripheral surface (47) of the control ring (40). Further, the test liquid may be applied to a position (18) where the male screw (13) of the joint body (10) faces the entrance (21a) of the female screw hole (21) from the outside.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. 1 is a cross-sectional view of a main part of a joint of a tube material, FIG. 2 is a cross-sectional view of the main part of a joint of a tube material in FIG. 1, and FIG. It is the figure which represented the route which the liquid leaks with the broken line.
[0020]
As shown in FIGS. 1 and 2, the joint of the present 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 / perfluoroalkylvinyl ether copolymer)” having excellent properties in chemical resistance.
[0021]
The nut member 20 is a so-called cap nut, and has a back wall 22 which is a cap portion substantially perpendicular to the screw axis on the back side of the female screw hole 21. A female screw portion 23 is engraved on the inner peripheral wall 21 b side of the female screw hole 21 of the nut member 20, and an insertion hole for inserting a tube material into the female screw hole 21 from the rear wall 22 side to the inner wall 22 of the nut member 20. 24 are drilled.
[0022]
The nut member 20 has a tightened 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 which is inserted into the inner side of the female screw hole 21 of the nut member 20. One end of the tube material T inserted into the female screw hole 21 through the insertion hole 24 of the nut member 20 is externally fitted to the outer fitting portion 12 in a state where the diameter thereof is increased. Therefore, one end 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 which is fitted to the externally fitted portion 12, and the general outer diameter portion T1. It is composed of a step portion T3 (or an expansion (flare)) which is an intermediate portion connecting to the diameter portion T2.
[0023]
A male screw 13 that is screwed into the female screw portion 23 is formed in the distal end portion 11 of the joint body 10 following the externally fitted portion 12. The diameter of the thread of the female screw portion 23 of the nut member 20 screwed to the male screw 13 and the inner peripheral wall 21b of the female screw hole 21 of the nut member 20 allow the enlarged diameter portion T2 of the tube material T to be relatively inserted therethrough. In addition, the diameter is set slightly larger than the outer diameter of the enlarged diameter portion T2 so that the diameter of the thread or the like is minimized.
[0024]
On the back side of the male screw 13 of the joint body 10, a stopper portion 17 having a substantially hexagonal cross section is provided. The proximal end portion of the joint body 10 forms an elbow portion bent in an L-shape. The joint body 10 is provided with a through hole 14 having a hole diameter substantially equal to the inner diameter of the tube material T and penetrating in the screw axis direction.
[0025]
In the present embodiment, an elbow is formed at the base end of the joint body 10, but the present invention is not limited to this. That is, the base end 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 shape.
[0026]
In a state where 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 back wall 22 of the nut member 20 and the rim 15 of the through hole 14 of the joint main body 10 are connected to the screw shaft. They are opposed 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 so that one end of the tube material T can be easily fitted to the outside and the stable airtightness is maintained. Further, a chamfered slope portion 19a for preventing accumulation of a liquid as a moving medium is formed on an inner peripheral edge of the edge portion 15.
[0027]
Further, the outer fitting portion 12 of the distal end portion 11 of the joint main body 10 to which the one end portion of the tube material T fits externally is opposed to the tightening force of the nut member 20 and minimizes the deformation in the diameter reducing direction, In order to prevent the relaxation of the sealing force, it has a sufficient thickness and the necessary rigidity. On the other hand, the back wall 22 of the nut member 20 is directed toward the center of the insertion hole 24 (the axis of the screw shaft) in the direction of the edge 15 of the through hole 14 of the joint body 10 (the direction of the screw hole entrance 21a). The cut-in portion 22a is inclined at a predetermined angle (25 degrees to 35 degrees).
[0028]
By tightening the female screw portion 23 of the nut member 20 into the male screw 13 of the joint body 10, the bite portion 22 a of the nut member 20 bites into the chamfered inclined portion 19 of the joint body 10, so that one end of the tube material T is connected The airtightness of the flow path F1 between the tube material T and the joint main body 10 is increased by press-fitting the main body 10.
[0029]
The detection ring 30 has a detection component for detecting liquid leakage. The detection ring 30 is externally fitted to the male screw 13 of the joint main body 10 or the back side of the male screw 13 so that the inlet 21a of the female screw hole 21 of the nut member 20 faces from the outside. The inner diameter portion 31 of the detection ring 30 has substantially the same diameter as the thread diameter of the male screw 13 so that the detection ring 30 does not rattle between the male screw 13 and the control ring 40, and the outer diameter portion 32 of the detection ring 30 has a control ring. The diameter is almost the same as the inner diameter of the forty.
[0030]
The detection component changes color in response to the liquid leaking from the flow path F1 to the inlet 21a of the female screw hole 21. The detection ring 30 is obtained by impregnating a test liquid as a detection component into a porous polymer body. The polymer porous body is impregnated with a mixed aqueous solution of polyethylene glycol 6000 and cobalt chloride as a test solution, and then dried at 125 ° C. for 10 minutes. Thereby, the detection ring 30 becomes blue.
[0031]
In addition to cobalt chloride, any hydrate and any substance having a deliquescent or hygroscopic property that can change color in response to a liquid and have stable properties as a test solution can be used. You may. If an indicator such as bromothymol blue is used instead of cobalt chloride, a specific chemical solution can be detected.
[0032]
When the nut member 20 is tightened, the control ring 40 is fitted over the external thread 13 of the joint body 10. The control ring 40 is formed in a substantially C-shape that is partially open. The open portion 49 is externally fitted from a direction orthogonal to the screw axis of the male screw 13 of the joint body 10. The control ring 40 is capable of adjusting 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.
[0033]
As a material of the control ring 40, a synthetic resin such as a polypropylene resin, a polyethylene resin, and a polyvinyl chloride resin is used. Further, a fluororesin such as PVF, PVDF, ECTFE, PCTFE, ETFE, FEP, PFA, and PTFE may be used. The control ring 40 has translucency so that the detection ring 30 can be seen from the outside through the control ring 40.
[0034]
When the nut member 20 is tightened, the control ring 40 contacts the peripheral portion 25 of the female screw hole 21 of the nut member 20, and the second end surface portion contacts the stopper portion 17 of the joint body 10. 44.
[0035]
The first end portion 42 is configured to make the friction torque received by the first end portion 42 from the peripheral portion 25 of the female screw hole 21 larger than the friction torque received by the second end portion 44 from the stopper portion 17 when the nut member 20 is tightened. Thus, the nut member 20 and the control ring 40 are formed so as to rotate together. Specifically, by setting the friction coefficients of the first end surface portion 42 and the second end surface portion 44 of the control ring 40 to μ1 and μ2 (μ1> μ2), respectively, the nut member 20 is tightened when the nut member 20 is tightened. And the control ring rotate together.
[0036]
Next, the operation of the present embodiment will be described.
One end 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 enlarged diameter portion T <b> 2 at one end of the tube material T is the tip end portion 11 of the joint body 10. Externally fitted to the part 12. A step portion T3 extending from the general outer diameter portion T1 of the tube material T to the enlarged diameter portion T2 in a state of being enlarged from the general outer diameter portion T1 extends obliquely along the chamfered slope portion 19 of the outer fitting portion 12 of the joint body 10.
[0037]
When the distal end 11 of the joint body 10 is inserted into the female screw hole 21 of the nut member 20, the start end of the male screw 13 of the joint 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 inserted into the female screw hole 21 of the nut member 20 (the screw thread of the female screw portion 23 or the inner peripheral wall 21b of the female screw hole 21) through a slight gap or the female screw hole. 21 and is relatively inserted while sliding.
[0038]
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 relatively rotated, the fitting body 10 The female screw portion 23 of the nut member 20 advances into the male screw 13. Before the tightening operation of the nut member 20, the open portion 49 of the control ring 40 is externally fitted to the male screw 13 from a direction perpendicular to the screw axis of the male screw 13 of the joint body 10.
[0039]
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 40 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 face 42 of the control ring 40 comes into contact with the peripheral edge 25 of the female screw hole 21 of the nut member 20, and the second end face 44 of the control ring 40 contacts the stopper 17 of the joint body 10. Comes into contact.
[0040]
When the nut member 20 is tightened, the friction torque that the first end face portion 42 receives from the peripheral edge portion 25 of the female screw hole 21 becomes larger than the friction torque that the second end face portion 44 receives from the stopper portion 17, and the nut member 20 is controlled by the nut member 20. The ring 40 and the ring 40 rotate together. After confirming the co-rotating state, when the tightening work of the nut member 20 is completed, the nut member 20 is in a state of being appropriately tightened.
[0041]
When the nut member 20 is properly tightened, the bite portion 22a of the back wall 22 of the nut member 20 bites into the step T3 of the tube material T, so that the tube material T can be prevented from coming off. At the same time, the step portion T3 of the tube material T is press-fitted to the chamfered inclined portion 19 of the joint body 10, so that a high airtightness of the flow path F1 between the tube material T and the joint body 10 can be obtained. In the flow path F1 having high airtightness, the liquid does not leak from the flow path F1 to the inlet 21a of the female screw hole 21, and the liquid does not penetrate into the detection ring 30 disposed facing the inlet 21a from outside. In addition, the detection component does not react to the liquid, and the detection ring 30 does not discolor.
[0042]
When the tightening force of the nut member 20 decreases, the airtightness of the flow path F1 decreases, and as shown by a broken line F2 in FIG. The gap between the stepped portion T3 of the material T, the gap between the externally fitted portion 12 of the joint body 10 and the enlarged diameter portion T2 of the tube material T, the male screw 13 of the joint body 10 and the female screw 23 of the nut member 20 And leaks out to the inlet 21a of the female screw hole 21 through the gap between the holes. The leaked liquid permeates into the detection ring 30 arranged facing the inlet 21a of the female screw hole 21.
[0043]
Thereby, the detection component of the detection ring 30 reacts with the liquid, and the detection ring 30 changes color. Since the control ring 40 has translucency, the discolored detection ring 30 can be visually recognized through the control ring 40 from outside. When the detection ring 30 impregnates the polymer porous body with the test solution and uses cobalt chloride as the test solution, if the leaked liquid (pure water cleaning solution) and the cobalt chloride are mixed, the detection ring 30 turns from blue to colorless or thin. It turns pink. This makes it possible to easily detect liquid leakage visually.
[0044]
In the above-described embodiment, the detection ring 30 and the control ring 40 are shown as separate bodies, but the detection ring 30 and the control ring 40 may be integrally formed using a resin mold. Further, by fitting the control ring 40 into the detection ring 30, the detection ring 30 and the control ring 40 may be integrally handled.
[0045]
Furthermore, as shown in FIG. 4, a test liquid that changes color in response to liquid leaking from the flow path F1 to the inlet 21a of the female screw hole 21 may be applied to the inner peripheral surface 41 of the control ring 40, The test liquid may be applied to the position 18 (the male screw 13 shown in FIG. 1 or the back side of the male screw 13) in which the male screw 13 of the joint body 10 faces the entrance 21a of the female screw hole 21 from the outside. Further, the sheet coated with the test solution may be attached to the inner peripheral surface 47 of the control ring 40 or the male screw 13. In this case, the control ring 40 has translucency so that the inner peripheral surface 47 of the control ring 40 can be seen from the outside. The control ring 40 has translucency so that the external thread 13 of the joint body 10 can be seen from the outside through the control ring 40.
[0046]
【The invention's effect】
According to the joint of the tube material according to the present invention, since the detection ring is provided, and the detection ring is externally fitted to the inner side of the male screw or the male screw of the joint body so that the inlet of the female screw hole of the nut member faces from the outside. For example, when the tightening force of the nut member decreases, the airtightness of the flow path decreases, and when the liquid leaks from the flow path through the gap between the male screw and the female screw to the inlet of the female screw hole, the female screw The liquid penetrates into the detection ring placed facing the entrance of the hole, and the detection component of the detection ring reacts with the liquid, causing the detection ring to change color, making it easy to visually check for liquid leakage. You can check.
[0047]
Further, since the control ring and the detection ring are provided, and the control ring has a light transmitting property, the discolored detection ring can be visually recognized through the control ring. Furthermore, since the detection ring and the control ring are integrally formed, the number of parts is reduced, the number of assembly steps is reduced, and the cost can be reduced. Furthermore, since the test solution is applied to the inner peripheral surface of the control ring, or the test solution is applied to the position of the male screw of the joint body facing the entrance of the female screw hole from the outside, the cost can be further reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of a joint of a tube material according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a cross-sectional view of a main part of a joint made of a tube material, mainly illustrating a path in which liquid leaks from a flow path by a broken line.
FIG. 4 is a cross-sectional view showing a joint of a tube material according to another embodiment of the present invention, cut away from a direction orthogonal to a flow path.
[Explanation of symbols]
F1 ... Flow path
F2: The path where the liquid leaks
T ... Tube material
T1 ... General outer diameter part
T2 ... Diameter
T3: Step
10 Joint body
11 ... tip
12 ... external fitting part
13 ... Male thread
13a ... neck
14 ... Through-hole
15 ... Mouth rim
17 ... Stopper part
19a ... chamfered slope
20 ... Nut member
21 ... female screw hole
21a: Entrance of female screw hole
21b ... inner peripheral wall of hole
22 ... back wall
22a ... bite section
23 ... Female thread
24 ... insertion hole
27… Tightened part
30 ... Detection ring
31 ... Inner diameter
32 ... Outer diameter part
40 ... control ring
42 first end face
44 second end surface
47 ... Inner circumference

Claims

One end of the tube material inserted into the female screw hole of the nut member is externally fitted to the joint body, and the female screw of the nut member is screwed into the male screw of the joint body, whereby one end of the tube material is pressed into the joint body. In order to enhance the airtightness of the flow path between the tube material and the joint body, in the joint of the tube material having a detection ring,
The detection ring is externally fitted on the inner side of the male screw or the male screw so as to face the entrance of the female screw hole of the nut member from the outside,
Further, the detection ring has a detection component for detecting liquid leakage by discoloring in response to liquid leaking from the flow path to the inlet of the female screw hole, characterized by having a detection component. Fittings.

One end of the tube material inserted into the female screw hole of the nut member is externally fitted to the joint body, and the female screw of the nut member is screwed into the male screw of the joint body, whereby one end of the tube material is pressed into the joint body. In order to enhance the airtightness of the flow path between the tube material and the joint body, a control ring and a tube material joint having a detection ring,
The joint body includes a stopper portion that is a circumferential flange on the back side of the male screw,
The control ring is externally fitted to the external thread of the joint body, and is disposed so as to be sandwiched between the stopper portion and the peripheral portion of the female screw hole of the nut member, thereby reducing the tightening strength of the nut member. Is adjustable,
Further, the control ring has translucency so that the detection ring can be seen from the outside through the control ring,
The detection ring is externally fitted to a male screw of the joint main body or a back side of the male screw so as to face an entrance of a female screw hole of the nut member from the outside,
Further, the detection ring has a detection component for detecting liquid leakage by discoloring in response to liquid leaking from the flow path to the inlet of the female screw hole, characterized by having a detection component. Fittings.

3. The joint according to claim 1, wherein the detection ring is formed by impregnating a polymer porous body with a test solution that changes color in response to the liquid. 4.

The joint according to claim 2, wherein the detection ring is formed integrally with the control ring.

One end of the tube material inserted into the female screw hole of the nut member is externally fitted to the joint body, and the female screw of the nut member is screwed into the male screw of the joint body, so that one end of the tube material is press-fitted to the joint body. In order to improve the airtightness of the flow path between the tube material and the joint body, in the joint of the tube material with a control ring,
The joint body includes a stopper portion that is a circumferential flange on the back side of the male screw,
The control ring is externally fitted to the external thread of the joint main body, and is disposed so as to be sandwiched between the stopper portion and the peripheral portion of the inlet of the female screw hole of the nut member, thereby tightening the nut member. The strength can be adjusted,
Further, the control ring has a light-transmitting property so that the inner peripheral surface of the control ring can be seen from the outside,
A joint for a tube material, wherein a test liquid that changes color in response to a liquid leaking from the flow path to an inlet of the female screw hole is applied to an inner peripheral surface of the control ring.

One end of the tube material inserted into the female screw hole of the nut member is externally fitted to the joint body, and the female screw of the nut member is screwed into the male screw of the joint body, so that one end of the tube material is press-fitted to the joint body. In order to improve the airtightness of the flow path between the tube material and the joint body, in the joint of the tube material with a control ring,
The joint body includes a stopper portion that is a circumferential flange on the back side of the male screw,
The control ring is externally fitted to the external thread of the joint body, and is disposed so as to be sandwiched between the stopper portion and the peripheral portion of the female screw hole of the nut member, thereby reducing the tightening strength of the nut member. Is adjustable,
Further, the control ring has a light transmitting property so that an external thread of the joint body can be seen from the outside through the control ring,
The male screw of the joint main body is coated with a test liquid that changes color in response to liquid leaking from the flow path to the inlet of the female screw hole at a position facing the inlet of the female screw hole from the outside. Tube material fittings.