JP3705155B2

JP3705155B2 - connector

Info

Publication number: JP3705155B2
Application number: JP2001166633A
Authority: JP
Inventors: 敦夫宮島
Original assignee: Tokai Rubber Industries Ltd
Current assignee: Sumitomo Riko Co Ltd
Priority date: 2000-07-19
Filing date: 2001-06-01
Publication date: 2005-10-12
Anticipated expiration: 2021-06-01
Also published as: JP2002098283A

Description

【０００１】
【発明の属する技術分野】
本発明は、逆止弁を内蔵したコネクタに係り、特に自動車の燃料タンクとキャニスター間を接続する配管装置等に好適に使用されるコネクタに関する。
【０００２】
【従来の技術】
従来、この種のコネクタとしては、例えば特開平８−３１２８６３号公報に記載されたものが知られている。この逆止弁を内蔵したコネクタは、コネクタに逆止弁が一体的に形成されているので、逆止弁を容易に接続できるという利点を有している。ところで、近年、燃料タンク内に発生する蒸発燃料をキャニスターに吸着させ、エンジン始動後に、キャニスター内の蒸発燃料を有効に利用できるシステムが各種開発されている。このシステムでは、給油終了後は、燃料タンク内の圧力上昇を防止するために正圧弁が開くようにし、エンジン始動後は速やかに吸着させた蒸発燃料をパージすることにより燃料タンク内が負圧になるので、これを防止するために負圧弁を開くようにしている。
【０００３】
ところが、かかるシステムに対しては、上記従来の逆止弁を内蔵したコネクタを用いようとすると、２個のコネクタを並列しなければならない。そのため、配管が複雑になると共に、配管スペースが大きくなってしまうという問題がある。
【０００４】
【発明が解決しようとする課題】
本発明は、上記した問題を解決しようとするもので、正圧弁と負圧弁を容易にかつコンパクトに接続できるコネクタを提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、上記請求項１の発明の構成上の特徴は、一端から他端に向かって延びる軸穴を有する筒状の第１の本体と、嵌合穴を有し、第１の本体の一端側端部に同軸的に連結された筒状の第２の本体と、一端開口を有し、第２の本体の一端側に同軸的に設けられた筒状の保持手段と、先端から所定距離を隔てた外周面に環状突部を有するストレートに延びる挿入端部を備え、挿入端部を保持手段の一端開口から挿通させると共に、挿入端部の先端部を第２の本体の嵌合穴に挿入させることができる管状の導管と、第１の本体と第２の本体とで形成された空洞部内に、第１の本体及び／または第２の本体と協働して構成された第１の逆止弁及び第２の逆止弁とを備えたコネクタであって、第１の本体が、軸方向中間位置に第１の逆止弁の環状の第１弁座を備えるために中間位置に対して一端側に他端側より大きな内径の大径穴と大径穴と隣接して他端側に小径穴とを備え、保持手段が、挿入端部を保持手段の一端開口から挿通させて、第２の本体の嵌合穴に挿入させたときに、挿入端部の環状突部とスナップ係合する弾性的に変形可能な変形可能部分を有する係合手段を備え、第１の逆止弁が、第１弁座に加えて、第１の本体の小径穴に沿って摺動可能な筒部と、第１弁座に当接するための筒部の外周に突設された環状の第１当接部とを備えた筒状の弁体と、第１当接部を第１弁座に当接させるべく筒状の弁体を付勢している第１のバネとにより構成され、第２の逆止弁が、筒状の弁体の内周面に形成された環状の第２弁座と、第２弁座に当接する第２当接部と、第２当接部を第２弁座に当接させるべく第２当接部を付勢している第２のバネとにより構成され、第１の逆止弁の筒部が、周方向の複数箇所にて軸方向に切り欠かれて、一端近傍から他端に向けて延びる複数の第１摺動片を備えており、第２の逆止弁の第２当接部の他端側に周方向の複数箇所から軸方向に延びて第１摺動片の間に配設される複数の第２摺動片を設けており、第１の本体の小径穴が第１摺動片及び第２摺動片の共通の摺動面となっていることにある。
【０００６】
上記のように構成した請求項１の発明においては、第１の本体の接続相手側が導管の接続相手側に対して正圧になると、第２の逆止弁については、第２当接部が第２弁座に当接して閉じた状態であるが、第１の逆止弁については、環状の第１当接部が第１のバネの付勢力に抗して軸方向一端側に向けて移動して第１弁座から離れることにより開放状態になる。これにより、第１の本体の接続相手側から導管の接続相手側へ流体が流れて、第１の本体の接続相手側の正圧状態が解消される。一方、導管の接続相手側が第１の本体の接続相手側に対して正圧になると、第１の逆止弁については、筒状の弁体の環状の第１当接部が第１弁座に当接して閉じた状態であるが、第２の逆止弁については、第２当接部が第２のバネの付勢力に抗して軸方向他端側に向けて移動して筒状の弁体に形成された環状の第２弁座から離れることにより開放状態になる。これにより、導管の接続相手側から第１の本体の接続相手側へ流体が流れて、導管の接続相手側の正圧状態が解消される。
【０００７】
すなわち、このコネクタでは、第１の逆止弁と第２の逆止弁が、第１の本体の接続相手側と導管の接続相手側の圧力状態に応じて正圧弁、負圧弁として作用するようになっている。そして、このコネクタでは、第１の逆止弁と第２の逆止弁が、第１の本体と第２の本体で形成された空洞内にまとめてコンパクトに配設されている。
【０００８】
また、本発明においては、第１の本体の小径穴が、第１の逆止弁の第１摺動片と第２の逆止弁の第２摺動片の共通の摺動面となっているため、第１摺動片と第２摺動片を円滑に摺動させるための高精度の加工が必要な摺動面を１箇所にまとめることができる。
【０００９】
また、上記請求項２の発明の構成上の特徴は、前記請求項１に記載のコネクタにおいて、第１弁座と第１当接部が当接する各当接面及び／又は第２弁座と第２当接部が当接する各当接面が、それぞれ曲面形状になっており互いに密着状態で当接可能であることにある。
【００１０】
上記のように構成した請求項２の発明においては、第１弁座と第１当接部が当接する各当接面あるいは第２弁座と第２当接部が当接する各当接面が、それぞれ曲面形状になっており互いに密着状態で当接可能であるため、第１弁座と第１当接部が当接する面積あるいは第２弁座と第２当接部が当接する面積すなわちシール面積が広く確保される。
【００１１】
【発明の実施の形態】
以下、本発明の一実施形態を図面を用いて説明する。図１〜図８は、参考例に係るコネクタを示したものである。また、コネクタは、筒状の第１の本体１０と、第１の本体１０の一端側端部１１に同軸的に連結された筒状の第２の本体２０と、この第２の本体２０の一端側端部２１に同軸的に連結された筒状の保持手段３０とからなる雌コネクタ要素を備える一方、雄要素として、先端から距離を隔てた外周面に環状突部４１ａをもつ挿入端部４１を備えた管状の導管４０を備えている。さらに、第１の本体１０と第２の本体２０とで形成された空洞内に、第１の本体１０及び／又は第２の本体２０と協働して後述する、一方にのみ流体を流すことができる第１の逆止弁５０及び他方側にのみ流体を流すことができる第２の逆止弁６０が配設されている。第１の本体１０及び第２の本体２０及び保持手段３０は、ポリアミド、ポリアセタール等の樹脂により射出成形されている。導管４０は、樹脂製あるいは金属製である。
【００１２】
第１の本体１０は、一端から他端に向けて延びる軸穴を有し、軸方向中間位置に第１の逆止弁５０の環状の第１弁座１４を備えるために、一端側端部１１に他端側よりも大きな内径を有する大径穴１１ａと他端側のこの大径穴１１ａの軸方向内方に隣接した小径穴１２ａとを備えている。
第２の本体２０は、導管４０の挿入端部４１の先端部４１ｂを受け入れるのに適した嵌合穴が形成されている。この嵌合穴は、図３に示すように、一端側に形成された第１の穴２１ａと他端側に形成された第２の穴２２ａとを備え，第１の穴２１ａは第２の穴２２ａより大径に形成され、この第１の穴２１ａにＯリング等のリング状のシール部材２９，２９が挿着されている。そして、筒状の保持手段３０の一端開口から導管４０の挿入端部４１を挿通させ、挿入端部４１の先端を第２の穴２２ａまで挿入係合させることができ、導管４０は第２の本体２０に同心的に支持される。このとき、挿入端部４１の先端部４１ｂの外周面はシール部材２９，２９の内周面と係合し、第２の本体２０と導管４０間は流体密にシールされることになる。
【００１３】
第２の本体２０の一端側端部に同軸的に連結された筒状の保持手段３０は、その一端側に形成された大径筒部３１と、この大径筒部３１の一端開口から導管４０の挿入端部４１を挿通させ、挿入端部４１の先端を第２の穴２２ａまで挿入させた時に、挿入端部４１の環状突部４１ａとスナップ係合する弾性的に変形可能な周方向に延びる変形可能部分を備えた２個の係合アーム部３４とを供えている。
【００１４】
第１の逆止弁５０は、第１の本体１０の大径穴１１ａと小径穴１２ａとの境に形成された半径方向に延びる環状の表面から軸方向一端側にわずかに突出して形成された環状の第１弁座１４と、第１の本体１０の小径穴１２ａに沿って摺動可能な筒部５２と、第１弁座１４に当接するための筒部５２の一端外周に突設された環状フランジからなる環状の第１当接部５３とを一体で備えた筒状の弁体５１と、第１当接部５３を第１弁座１４に当接させるべく弁体５１を付勢している第１のバネ５４とで構成されている。ここで、筒部５２には、図４及び図５に示すように、周方向に複数の第１の切欠き５２ａが設けられており、弁体５１が開いたときに、第１の本体１０の流通穴１３ａ側の流体を小径穴１２ａからその大径穴１１ａ側に容易に流れるようにしている。また第１当接部５３の外周縁部には、第１の切欠き５２ａから第２の本体２０内に流体が流れるように第２の切欠き５３ａが設けられている。
【００１５】
また、第２の逆止弁６０が、第１の逆止弁５０の筒状の弁体５１の一端内周面に形成された径方向に延びる環状の第２弁座５５と、弁体５１内に配設され第２弁座５５に当接するキャップ形状の第２当接部６１と、第２当接部６１を第２弁座５５に当接させるべく第２当接部６１を付勢している第２のバネ６２とで構成されている。
【００１６】
さらに詳しく説明すると、第１の本体１０は、他端に一端側よりも小径に形成された小径端部１３を備えている。この小径端部１３の外周面には複数の環状突起が形成されており、小径端部１３の外周面に樹脂チューブ１９の端部が圧入されることにより、一体的に抜け止め固着されている。この小径端部１３には、小径穴１２ａよりさらに小さい流通穴１３ａが設けられている。小径穴１２ａと流通穴１３ａとの境界には径方向に延びる環状の表面１２ｂが形成されている。この環状の表面１２ｂと第２当接部６１間に第２のバネ６２が圧縮状態に配置され、環状の表面１２ｂにて圧縮された上記第２のバネ６２の対向端を受けている。なお、第１の本体１０の一端には径方向外方に突出した環状のフランジ部１５が施され、フランジ部１５の表面に複数の周溝１５ａが設けられている。
【００１７】
また、一端から他端に延びる筒状の第２の本体２０は、図３に示すように、一端側に上記第１の穴２１ａを有する第１の端部２１と、他端側に上記第２の穴２２ａを有する第２の端部２２が設けられ、第１の端部２１と第２の端部２２との境界の外周に径方向外方に突出した環状のフランジ部２３が設けられている。そして、第１の端部２１は、その一端外周面上に周方向に間隔を隔てて径方向外方に突出した４個の係合突部２１ｂが設けられている。また、第２の端部２２は、その外周面上に周方向に間隔を隔てて、軸方向に延びる切欠き溝２６ａが形成され、多数の突条２６が形成されている。また、第２の端部２２の他端には多数のスロット２７が切欠き溝２６ａの延長線上に形成されている。
【００１８】
また、環状のフランジ部２３の裏面（他端側の面）には、第１の本体１０の大径穴１１ａに挿嵌される、第２の端部２２の外周面との間にリング状の溝２４ａを隔てて第２の端部２２と同心的に配設された比較的に短い軸方向に延びる筒部２４と、筒部２４との間に周溝２５ａを隔てて同心的に配設された軸方向に突出したリング状突起２５とが形成されている。
【００１９】
そして、第１の本体１０と第２の本体２０とは、第２の本体２０の軸方向に延びる筒部２４が第１の本体１０の大径穴１１ａに挿嵌され、第２の本体２０の環状のフランジ部２３の裏面が第１の本体１０の一端に形成されたフランジ部１５の表面に当接するように超音波溶着されている。このとき、弁体５１が軸方向に移動できるように、第２の端部２２の終端と第１の本体１０に形成された第１弁座１４間に軸方向の空間が設けられている。そして、上記第１のバネ５４がリング状の溝２４ａの底面と弁体５１の第１当接部５３間に圧縮状態で配置されている。
【００２０】
保持手段３０は、図１及び図２に示すように、一端側に、両側に環状の鍔部３１ａ，３１ｂを有する大径筒部３１が設けられ、他端側に、他側の鍔部３１ｂに隣接して小径筒部３２と、小径筒部３２の外周に径方向に間隔を隔てて４個の係止部３３が周方向に間隙を隔てて形成されている。４個の係止部３３はそれぞれコの字形状の窓３３ａを有している。保持手段３０は、その小径筒部３２が第２の本体２０の第１の端部２１に挿嵌されると共にその係止部３３に形成されたコの字形状の窓３３ａの周方向中央部が第２の本体２０の第１の端部２１一端に外周面上に形成された４個の係合突部２１ｂにスナップ係合することにより、第２の本体２０に連結される。
【００２１】
大径筒部３１には、図６に示すように、弾性的に変形可能な周方向に延びる変形可能部分を備えた２個の係合アーム部３４が設けられている。すなわち、図１、図２に示すように、２個の係合アーム部３４は、互いに軸方向に間隔を隔てて対向している環状の鍔部３１ａ，３１ｂ内側に隣接しているそれぞれの同一円上に設けられたそれぞれの周方向の切欠き部３４ａ，３４ｂと、この切欠き部３４ａ，３４ｂを周方向に連通した軸方向切欠き部（図示しない）とで形成された窓を形成することにより構成されている。それぞれの係合アーム部３４の自由端には、導管４０の環状突部４１をスナップ入りさせるための案内面をもつ円弧状の係合爪３４ｃが設けられている。したがって、この大径筒部３１の一端開口から導管４０の挿入端部４１を挿通させ、挿入端部４１の先端を第２の穴２２ａまで挿入させたときに、挿入端部４１の環状突部４１ａとスナップ係合し、導管４０を実質的に第１の逆止弁５０及び第２の逆止弁６０を備えた雌要素１０，２０，３０に接続することができる。
【００２２】
参考例では、保持手段３０が第２の本体２０とは独立した部材で構成されているが、第２の本体２０と一体で構成することができる。この場合、好ましくは小径筒部３２に代えて独立したブッシュを採用することができる。また、係合アーム部３４は筒部３１と一体で構成されているが、特開平６−２２１４８６号に記載された止め部材、特開平５−１９６１８４号に記載されたリテーナのように、かかる公知の係合手段を採用して、筒部に取外し可能に装着して本発明を構成することができる。
【００２３】
つぎに、参考例のコネクタの動作について、コネクタを自動車の燃料タンクとキャニスター間に採用した実施例に基づいて説明する。
キャニスター（図示しない）の入口に固定された雄要素としての導管４０に、雌要素を備えたコネクタを接続する一方、コネクタに固着された樹脂チューブ１９の他端を燃料タンクの出口のロールオーバー弁（図示しない）の出口に接続する。燃料タンクとキャニスター間に圧力差が無いときは、図２に示すように、第１の逆止弁５０は第１のバネ５４に押されて第１弁座１４に当接し、第２の逆止弁６０は第２のバネ６２に押されて第２弁座５５に当接しており、共に閉じた状態にある。
【００２４】
燃料タンクの内圧上昇時には、図７に示すように、樹脂チューブ１９側から矢印方向に正圧が作用し、第２当接部６１が必然的に弁体５１に形成された第２弁座５５に押し当てられて第２の逆止弁６０が閉鎖する一方、第２の逆止弁６０が閉鎖することにより、弁体５１に正圧が作用して、図に示すように第１のバネ５４に打ち勝って弁体５１が一端側に移動し、第１の逆止弁５０が開く。そして、矢印で示すように、第２の切欠き５３ａ及び第２の本体２０の第２の端部２２の他端に形成された多数のスロット２７を通過して、樹脂チューブ１９側から導管４０へ流体が流れ、燃料タンクの内圧上昇が抑制される。
【００２５】
燃料タンク内が負圧になると、図８に示すように、当然、弁体５１のフランジ状の第１当接部５３が第１のバネ５４により第１弁座１４に当接して第１の逆止弁５０が閉鎖するので、第２当接部６１が負圧により第２のバネ６２に打ち勝って他側に吸い寄せられ、第２の逆止弁６０が開く。その結果、導管４０側の空気が、矢印で示すように、第２弁座５５に形成された穴を通り、つぎに弁体５１の筒部５２に形成された第１の切欠き５２ａを通過して、樹脂チューブ１９を介して燃料タンク内に流れ込み、燃料タンクの負圧が緩和される。
【００２６】
以上に説明したように、参考例に係るコネクタは、筒状の第１の本体１０，第２の本体２０と協働して、第１の本体１０、第２の本体２０内に第１の逆止弁５０と第２の逆止弁６０が同軸的にしかも第２当接部６１が弁体５１に同心的に収容されているので、正圧弁と負圧弁を容易にかつコンパクトに接続することができる。
【００２７】
つぎに、第１の実施形態について図９〜図１３により説明する。
本実施形態においては、上記参考例に対して、第１の逆止弁及び第２の逆止弁の構造を変更したものである。第１の逆止弁７０は、上記第１の逆止弁５０に対して、弁体７１が異なった構造になっている。弁体７１は、図１０、図１１に示すように、第１の本体１０の小径穴１２ａに沿って摺動可能な筒部７２と、第１弁座１４に当接するための筒部７２の一端外周に突設された環状フランジからなる環状の第１当接部７３を備えている。
【００２８】
筒部７２は、第１当接部７３の他端にて周方向の複数箇所から軸方向に延びた複数の第１摺動片になっており、各第１摺動片の間が複数の切欠き７２ａになっている。そのため、弁体７１が開いたときに、第１の本体１０の流通穴１３ａ側の流体が、切欠き７２ａを通して小径穴１２ａから大径穴１１ａ側に容易に流れるようになっている。また、第１当接部７３は、その外径が上記第１当接部５３の外径に比べて小さく、したがってその外周縁と大径穴１１ａとの間に大きな隙間が設けられており、流体がスムーズに流通できるようになっている。そのため、第１当接部７３の外周縁には、上記第１当接部５３に設けた切欠きが設けられていない。さらに、第１当接部７３は、第１弁座１４との当接面側が、第１弁座１４に向けて突出した先端が尖った断面楔形の環状の突起部７４になっている。
【００２９】
また、第２の逆止弁８０は、第１の逆止弁７０の筒状の弁体７１の一端内周面に形成された径方向に延びる環状の凹曲面である第２弁座７５と、第２弁座７５に当接するキャップ形状の第２当接部８１と、第２当接部８１を第２弁座７５に当接させるべく第２当接部８１を付勢している第２のバネ６２とで構成されている。第２当接部８１は、図１２、図１３に示すように、略半球のキャップ状の当接部になっており、当接部の円形の開放端部（他端部）に、その周方向の４箇所から径方向外方にわずかに延び、先端側で曲げられて軸方向に延びた複数の第２摺動片からなる摺動部８２を一体で設けている。摺動部８２の外径は、上記筒部７２の外径と略同一になっており、筒部７２の切欠き７２ａの間に位置するように同軸的に配設され、その外周面が第１の本体１０の小径穴１２ａに沿って摺動可能になっている。
【００３０】
上記第１の実施形態によれば、弁体７１に加わる軸方向他端方向の力が、突起部７４の先端に集中するため、突起部７４と第１弁座１４との緊密な接触が確保される。その結果、弁体７１と第１弁座１４とのシール性が高められる。また、第１の本体１０の小径穴１２ａが、第１の逆止弁７０の筒部７２第１摺動片と、第２の逆止弁８０の摺動部８２の共通の摺動面となっており、筒部７２と摺動部８２を円滑に摺動させるための高精度の加工が必要な摺動面を１箇所にまとめることができる。その結果、コネクタの構造をコンパクトにできると共に、その製造コストを安価にすることができる。
【００３１】
つぎに、第２の実施形態について図１４〜図１８により説明する。本実施形態においても、上記参考例及び第１の実施形態に対して、第１の逆止弁及び第２の逆止弁の構造を変更したものである。
第１の逆止弁９０は、上記第１の逆止弁５０に対して、第１弁座１７と、弁体９１とが異なった構造になっており、第１のバネ５４は同一である。第１弁座１７は、図１４に示すように、大径穴１１ａと小径穴１２ａの境界の垂直内壁面から一端側に向けて突出しており、その先端面が一端側から他端側に向けて内径が小さくなっていると共にその断面が円弧形状である凹曲面になっている。
【００３２】
弁体９１は、図１５、図１６に示すように、第１の本体１０の小径穴１２ａに沿って摺動可能な筒部９２と、第１弁座１７に当接するための筒部９２の一端外周に突設された環状フランジからなる環状の第１当接部９３を備えている。筒部９２は、第１当接部９３の他端にて周方向の複数箇所から軸方向に延びた複数の第１摺動片になっており、各第１摺動片の間が複数の切欠き９２ａになっている。また、第１当接部９３は、その外径が第１弁座１７の外周面の外径と略同一であり、かつ外周部分が第１弁座１７の先端の凹曲面１７ａに対応した曲率の凸曲面９３ａになっており、第１弁座１７に当接したときに、凸曲面９３ａが第１弁座１７の凹曲面に密着するようになっている。
【００３３】
また、第２の逆止弁１００は、上記第２の逆止弁８０と略同様の構成であり、第１の逆止弁９０の筒状の弁体９１に設けた環状の第２弁座９５と、第２弁座９５に当接するキャップ形状の第２当接部１０１と、第２当接部１０１を第２弁座９５に当接させるべく第２当接部１０１を付勢している第２のバネ６２とで構成されている。第２当接部１０１は、略半球のキャップ状の当接部になっており、当接部の円形の開放端部に、その周方向の４箇所から径方向にわずかに延びた突出片１０２ａと、突出片１０２ａの先端側で曲げられて軸方向に延びた複数の第２摺動片１０２ｂからなる摺動部１０２を設けている。摺動部１０２は、筒部９２と同一外径になっており、第２摺動片１０２ｂが筒部９２の切欠き９２ａ内に位置するように同軸的に配設され、その外周面が第１の本体１０の小径穴１２ａに沿って摺動可能になっている。
【００３４】
上記第２の実施形態によれば、第１弁座１７と第１当接部９３が当接する面積すなわちシール面積が広く確保されるためシール効果が高められる。また、各当接面を曲面形状にするのみなのでシール面積を広げるためのスペースを広げる必要もない。さらに、当接面が互いに曲面になっていることにより、両逆止弁９０，１００の径方向への位置ずれが是正され、逆止弁の軸方向への移動が安定して行われる。また、第１の本体１０の小径穴１２ａが、第１の逆止弁９０の筒部９２の第１摺動片と、第２の逆止弁１００の摺動部１０２の第２摺動片１０２ｂとの共通の摺動面となっていることによる効果については、上記第１の実施形態に示した通りである。
【００３５】
なお、上記実施形態とは逆に、コネクタをタンク側、すなわちロールオーバーバルブ側に接続しても同様の効果が得られる。その他、上記実施形態に示したコネクタについては一例であり、本発明の主旨を逸脱しない範囲においては、種々の形態で実施することができる。
【００３６】
【発明の効果】
上記請求項１の発明によれば、このコネクタでは、第１の逆止弁と第２の逆止弁が、第１の本体と第２の本体で形成された空洞内にまとめてコンパクトに配設されるため、配管を単純に構成することができ、さらに配管スペースを広げることもない。
【００３７】
また、請求項１の発明によれば、第１の本体の小径穴が、第１の逆止弁の第１摺動片と第２の逆止弁の第２摺動片の共通の摺動面となっており、高精度の加工が必要な摺動面を１箇所にまとめることができるため、コネクタの構造をコンパクトにできると共に、その製造コストを安価にすることができる。
【００３８】
また、上記請求項２の発明によれば、第１弁座と第１の当接部が当接する面積あるいは第２弁座と第２の当接部が当接する面積すなわちシール面積が広く確保されるため、各逆止弁のシール効果が高められる。また、各当接面を曲面形状にするのみなのでシール面積を広げるためのスペースを広げる必要もない。さらに、当接面が互いに曲面になっていることにより、逆止弁の径方向への位置ずれが是正され、逆止弁の軸方向への移動が安定して行われる。
【図面の簡単な説明】
【図１】参考例であるコネクタを示す正面面図である。
【図２】同コネクタを示す図１の軸線位置での断面図である。
【図３】同コネクタを構成する第２の本体を示す断面図である。
【図４】弁体を示す正面図である。
【図５】図２のＶ−Ｖ線位置での断面図である。
【図６】図２のＶＩ−ＶＩ線方向の断面図である。
【図７】樹脂チューブ側から導管側へ流体が流れる場合の作用態様を説明する断面図である。
【図８】導管側から樹脂チューブ側へ流体が流れる場合の作用態様を説明する断面図である。
【図９】第１の実施形態であるコネクタを示す軸線位置での断面図である。
【図１０】同コネクタの弁体を示す正面図である。
【図１１】同コネクタの弁体を示す軸線位置での断面図である。
【図１２】同コネクタの弁体を示す正面図である。
【図１３】同コネクタの弁体を示す軸線位置での断面図である。
【図１４】第２の実施形態であるコネクタを示す軸線位置での断面図である。
【図１５】同コネクタの弁体を示す正面図である。
【図１６】同コネクタの弁体を示す軸線位置での断面図である。
【図１７】同コネクタの弁体を示す正面図である。
【図１８】同コネクタの弁体を示す軸線位置での断面図である。
【符号の説明】
１０…第１の本体、１１ａ…大径穴、１２ａ…小径穴、１４…第１弁座、２０…第２の本体、２１…第１の端部、２２…第２の端部、３０…保持手段、３１…大径筒部、３２…小径筒部、３３…係止部、３４…係合アーム部、４０…導管、４１…挿入端部、５０…第１の逆止弁、５１…弁体、５１ａ…筒部、５１ｂ…第１当接部、５２…第１のバネ、６０…第２の逆止弁、６１…第２当接部、６２…第２のバネ、７０…第１の逆止弁、７１…弁体、７２…筒部、７３…第１当接部、７５…第２弁座、８０…第２の逆止弁、８１…第２当接部、８２…摺動部、９０…第１の逆止弁、９１…弁体、９２…筒部、９３…第１当接部、９５…第２弁座、１００…第２の逆止弁、１０１…第２当接部、１０２…摺動部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connector with a built-in check valve, and more particularly to a connector suitably used for a piping device for connecting a fuel tank and a canister of an automobile.
[0002]
[Prior art]
Conventionally, as this type of connector, for example, a connector described in JP-A-8-31863 is known. The connector incorporating the check valve has an advantage that the check valve can be easily connected because the check valve is integrally formed with the connector. In recent years, various systems have been developed in which evaporated fuel generated in a fuel tank is adsorbed by a canister and the evaporated fuel in the canister can be used effectively after the engine is started. In this system, after refueling, the positive pressure valve is opened to prevent the pressure inside the fuel tank from rising, and after the engine is started, the fuel tank is brought to negative pressure by purging the adsorbed evaporated fuel immediately. Therefore, in order to prevent this, the negative pressure valve is opened.
[0003]
However, for such a system, if a connector incorporating the above-described conventional check valve is used, two connectors must be arranged in parallel. Therefore, there is a problem that the piping becomes complicated and the piping space becomes large.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a connector capable of easily and compactly connecting a positive pressure valve and a negative pressure valve.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the structural features of the invention of claim 1 include a cylindrical first main body having an axial hole extending from one end toward the other end, a fitting hole, A cylindrical second body coaxially connected to one end of one main body, and a cylindrical holding means having one end opening and coaxially provided on one end of the second body; An insertion end portion extending straight and having an annular protrusion on the outer peripheral surface at a predetermined distance from the tip end, the insertion end portion being inserted through one end opening of the holding means, and the tip end portion of the insertion end portion being the second main body In a cavity formed by a tubular conduit that can be inserted into the fitting hole and the first body and the second body, in cooperation with the first body and / or the second body. A connector having a first check valve and a second check valve, wherein the first body is first in the axially intermediate position. In order to provide an annular first valve seat of the check valve, a large-diameter hole having an inner diameter larger than the other end side on one end side with respect to the intermediate position, a small-diameter hole on the other end side adjacent to the large-diameter hole, The holding means is elastically deformable so as to snap-engage with the annular protrusion of the insertion end when the insertion end is inserted through the one end opening of the holding means and inserted into the fitting hole of the second body. And a first check valve, in addition to the first valve seat, a cylindrical portion slidable along the small-diameter hole of the first main body, and the first valve seat A cylindrical valve body provided with an annular first abutting portion projecting on the outer periphery of the cylindrical portion for abutting on the cylindrical portion, and a cylindrical shape for bringing the first abutting portion into contact with the first valve seat An annular second valve seat formed on the inner peripheral surface of the tubular valve body, and a second valve seat, the second check valve being configured by a first spring that biases the valve body. A second abutting portion that abuts on the By a second spring which urges the second contact portion to the contact portion is brought into contact with the second valve seat The cylindrical portion of the first check valve is notched in the axial direction at a plurality of locations in the circumferential direction and includes a plurality of first sliding pieces extending from the vicinity of one end toward the other end; A plurality of second sliding pieces extending in the axial direction from a plurality of locations in the circumferential direction and provided between the first sliding pieces are provided on the other end side of the second contact portion of the second check valve. The small diameter hole of the first body is a common sliding surface for the first sliding piece and the second sliding piece. .
[0006]
In the invention of claim 1 configured as described above, when the connection counterpart side of the first main body becomes positive pressure with respect to the connection counterpart side of the conduit, the second contact portion is In the first check valve, the annular first contact portion faces the one end side in the axial direction against the urging force of the first spring. It will be in an open state by moving away from the first valve seat. Thereby, the fluid flows from the connection counterpart side of the first main body to the connection counterpart side of the conduit, and the positive pressure state on the connection counterpart side of the first main body is eliminated. On the other hand, when the connection partner side of the conduit becomes positive pressure with respect to the connection counterpart side of the first main body, the annular first contact portion of the cylindrical valve body is the first valve seat for the first check valve. In the second check valve, the second contact portion moves toward the other end side in the axial direction against the urging force of the second spring. It will be in an open state by leaving | separating from the cyclic | annular 2nd valve seat formed in this valve body. Thereby, the fluid flows from the connection partner side of the conduit to the connection counterpart side of the first main body, and the positive pressure state on the connection partner side of the conduit is eliminated.
[0007]
That is, in this connector, the first check valve and the second check valve act as a positive pressure valve and a negative pressure valve according to the pressure state on the connection counterpart side of the first main body and the connection counterpart side of the conduit. It has become. In this connector, the first check valve and the second check valve are collectively arranged in a cavity formed by the first main body and the second main body.
[0008]
In the present invention, the small-diameter hole of the first main body serves as a common sliding surface for the first sliding piece of the first check valve and the second sliding piece of the second check valve. Therefore, the sliding surfaces that require high-precision processing for smoothly sliding the first sliding piece and the second sliding piece can be collected in one place. .
[0009]
The structural feature of the invention of claim 2 is the connector according to claim 1, Each abutment surface where the first valve seat and the first abutment portion abut and / or each abutment surface where the second valve seat and the second abutment portion abut each have a curved shape, and are in close contact with each other. Abutable There is.
[0010]
In the invention of claim 2 configured as described above, Each abutment surface where the first valve seat and the first abutment portion abut or each abutment surface where the second valve seat and the second abutment portion abut each has a curved shape, and abuts in close contact with each other. Since it is possible, the area where the first valve seat and the first contact portion abut or the area where the second valve seat and the second contact portion abut, that is, the seal area is secured widely. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 8 are Reference example The connector which concerns on is shown. The connector includes a cylindrical first main body 10, a cylindrical second main body 20 that is coaxially connected to one end 11 of the first main body 10, and the second main body 20. An insertion end portion having a female connector element comprising a cylindrical holding means 30 coaxially connected to one end side end portion 21 and having an annular protrusion 41a on the outer peripheral surface at a distance from the tip as a male element A tubular conduit 40 with 41 is provided. Further, in a cavity formed by the first main body 10 and the second main body 20, a fluid is allowed to flow only to one side described later in cooperation with the first main body 10 and / or the second main body 20. A first check valve 50 capable of generating fluid and a second check valve 60 capable of flowing fluid only on the other side are provided. The first main body 10, the second main body 20, and the holding means 30 are injection-molded with a resin such as polyamide or polyacetal. The conduit 40 is made of resin or metal.
[0012]
The first main body 10 has a shaft hole extending from one end toward the other end, and is provided with an annular first valve seat 14 of the first check valve 50 at an axially intermediate position. 11 is provided with a large-diameter hole 11a having an inner diameter larger than that of the other end, and a small-diameter hole 12a adjacent to the inside of the large-diameter hole 11a on the other end side in the axial direction.
The second main body 20 is formed with a fitting hole suitable for receiving the distal end portion 41 b of the insertion end portion 41 of the conduit 40. As shown in FIG. 3, the fitting hole includes a first hole 21a formed on one end side and a second hole 22a formed on the other end side, and the first hole 21a is a second hole. The first hole 21a is formed with a ring-shaped seal member 29, 29 such as an O-ring. Then, the insertion end 41 of the conduit 40 can be inserted through one end opening of the cylindrical holding means 30, and the distal end of the insertion end 41 can be inserted and engaged to the second hole 22a. Concentrically supported by the body 20. At this time, the outer peripheral surface of the distal end portion 41b of the insertion end portion 41 is engaged with the inner peripheral surfaces of the seal members 29, 29, and the second main body 20 and the conduit 40 are sealed in a fluid-tight manner.
[0013]
A cylindrical holding means 30 coaxially connected to one end of the second main body 20 includes a large diameter cylindrical portion 31 formed on one end thereof, and a conduit from one end opening of the large diameter cylindrical portion 31. When the insertion end 41 of 40 is inserted and the tip of the insertion end 41 is inserted into the second hole 22a, the elastically deformable circumferential direction snap-engaged with the annular protrusion 41a of the insertion end 41 And two engaging arm portions 34 each having a deformable portion extending in the direction.
[0014]
The first check valve 50 is formed so as to slightly protrude from the radially extending annular surface formed at the boundary between the large diameter hole 11a and the small diameter hole 12a of the first main body 10 toward one end side in the axial direction. An annular first valve seat 14, a cylindrical portion 52 slidable along the small-diameter hole 12 a of the first main body 10, and an outer periphery of one end of the cylindrical portion 52 for coming into contact with the first valve seat 14. A cylindrical valve body 51 integrally provided with an annular first contact portion 53 formed of an annular flange, and urges the valve body 51 to bring the first contact portion 53 into contact with the first valve seat 14. The first spring 54 is configured. Here, as shown in FIGS. 4 and 5, the cylindrical portion 52 is provided with a plurality of first notches 52 a in the circumferential direction, and when the valve body 51 is opened, the first main body 10 is provided. The fluid on the side of the flow hole 13a easily flows from the small diameter hole 12a to the large diameter hole 11a side. A second notch 53 a is provided at the outer peripheral edge of the first contact portion 53 so that fluid flows from the first notch 52 a into the second main body 20.
[0015]
The second check valve 60 includes a second annular valve seat 55 extending in the radial direction formed on the inner peripheral surface of one end of the tubular valve body 51 of the first check valve 50, and the valve body 51. A cap-shaped second contact portion 61 that is disposed inside and contacts the second valve seat 55, and the second contact portion 61 is biased so that the second contact portion 61 contacts the second valve seat 55. The second spring 62 is configured.
[0016]
More specifically, the first main body 10 includes a small-diameter end portion 13 formed at the other end with a smaller diameter than the one end side. A plurality of annular protrusions are formed on the outer peripheral surface of the small-diameter end portion 13, and the end portion of the resin tube 19 is press-fitted into the outer peripheral surface of the small-diameter end portion 13, so that it is integrally secured to the removal end. . The small-diameter end 13 is provided with a flow hole 13a that is smaller than the small-diameter hole 12a. An annular surface 12b extending in the radial direction is formed at the boundary between the small diameter hole 12a and the flow hole 13a. A second spring 62 is disposed between the annular surface 12b and the second contact portion 61 in a compressed state, and receives the opposite end of the second spring 62 compressed by the annular surface 12b. An end of the first main body 10 is provided with an annular flange portion 15 projecting radially outward, and a plurality of circumferential grooves 15 a are provided on the surface of the flange portion 15.
[0017]
As shown in FIG. 3, the cylindrical second main body 20 extending from one end to the other end includes a first end 21 having the first hole 21a on one end side and the second end 20 on the other end side. A second end portion 22 having two holes 22a is provided, and an annular flange portion 23 projecting radially outward is provided on the outer periphery of the boundary between the first end portion 21 and the second end portion 22. ing. The first end portion 21 is provided with four engaging protrusions 21b protruding outward in the radial direction at intervals in the circumferential direction on the outer peripheral surface at one end thereof. Further, the second end portion 22 is formed with notched grooves 26a extending in the axial direction at intervals on the outer peripheral surface thereof in the circumferential direction, and a plurality of protrusions 26 are formed. Further, at the other end of the second end portion 22, a large number of slots 27 are formed on the extended line of the notch groove 26a.
[0018]
In addition, a ring shape is formed between the outer surface of the second end portion 22 inserted into the large-diameter hole 11 a of the first main body 10 on the back surface (the other end surface) of the annular flange portion 23. A relatively short axially extending cylindrical portion 24 disposed concentrically with the second end portion 22 with a groove 24a therebetween, and a circumferential groove 25a between the cylindrical portion 24 and a concentric arrangement. A ring-shaped protrusion 25 that protrudes in the axial direction is formed.
[0019]
In the first main body 10 and the second main body 20, the cylindrical portion 24 extending in the axial direction of the second main body 20 is inserted into the large-diameter hole 11 a of the first main body 10, and the second main body 20. The annular flange portion 23 is ultrasonically welded so that the back surface of the flange portion 15 formed at one end of the first main body 10 contacts the surface of the flange portion 15. At this time, an axial space is provided between the terminal end of the second end 22 and the first valve seat 14 formed in the first main body 10 so that the valve body 51 can move in the axial direction. The first spring 54 is disposed in a compressed state between the bottom surface of the ring-shaped groove 24 a and the first contact portion 53 of the valve body 51.
[0020]
As shown in FIGS. 1 and 2, the holding means 30 is provided with a large-diameter cylindrical portion 31 having annular flange portions 31a and 31b on both sides on one end side, and on the other end side the other flange portion 31b. Adjacent to the small-diameter cylindrical portion 32, and four locking portions 33 are formed on the outer periphery of the small-diameter cylindrical portion 32 with a gap in the circumferential direction with a gap in the radial direction. Each of the four locking portions 33 has a U-shaped window 33a. The holding means 30 has a small-diameter cylindrical portion 32 inserted into the first end 21 of the second main body 20 and a central portion in the circumferential direction of a U-shaped window 33a formed in the locking portion 33. Is connected to the second main body 20 by snap-engaging with four engaging protrusions 21b formed on the outer peripheral surface at one end of the first end 21 of the second main body 20.
[0021]
As shown in FIG. 6, the large-diameter cylindrical portion 31 is provided with two engagement arm portions 34 each having a deformable portion extending in the circumferential direction that is elastically deformable. That is, as shown in FIGS. 1 and 2, the two engaging arm portions 34 are adjacent to each other adjacent to the inner side of the annular flange portions 31a and 31b that are opposed to each other at an interval in the axial direction. A window formed by each circumferential notch 34a, 34b provided on the circle and an axial notch (not shown) communicating the notches 34a, 34b in the circumferential direction is formed. It is constituted by. An arcuate engagement claw 34c having a guide surface for snapping the annular protrusion 41 of the conduit 40 is provided at the free end of each engagement arm 34. Therefore, when the insertion end 41 of the conduit 40 is inserted from one end opening of the large-diameter cylindrical portion 31 and the tip of the insertion end 41 is inserted to the second hole 22a, the annular protrusion of the insertion end 41 is inserted. 41a can be snap-engaged and the conduit 40 can be connected to the female element 10, 20, 30 comprising substantially a first check valve 50 and a second check valve 60.
[0022]
Reference example Then, although the holding means 30 is comprised with the member independent of the 2nd main body 20, it can be comprised integrally with the 2nd main body 20. FIG. In this case, it is preferable to employ an independent bush instead of the small diameter cylindrical portion 32. Further, the engaging arm portion 34 is formed integrally with the cylindrical portion 31, but such a known member as a retaining member described in JP-A-6-221486 and a retainer described in JP-A-5-196184. The present invention can be constructed by adopting the engaging means and detachably mounting on the cylindrical portion.
[0023]
Next, Reference example The operation of the connector will be described based on an embodiment in which the connector is adopted between a fuel tank and a canister of an automobile.
A connector having a female element is connected to a conduit 40 as a male element fixed to the inlet of a canister (not shown), while the other end of the resin tube 19 fixed to the connector is connected to a rollover valve at the outlet of the fuel tank. Connect to outlet (not shown). When there is no pressure difference between the fuel tank and the canister, as shown in FIG. 2, the first check valve 50 is pushed by the first spring 54 and comes into contact with the first valve seat 14, and the second reverse valve The stop valve 60 is pressed by the second spring 62 and is in contact with the second valve seat 55, and both are closed.
[0024]
When the internal pressure of the fuel tank rises, as shown in FIG. 7, a positive pressure acts in the direction of the arrow from the resin tube 19 side, and the second valve seat 55 in which the second contact portion 61 is necessarily formed in the valve body 51. The second check valve 60 is closed by being pressed against the second check valve 60, while the second check valve 60 is closed, so that a positive pressure acts on the valve body 51 and the first spring as shown in the figure. The valve body 51 moves to one end side by overcoming 54, and the first check valve 50 opens. Then, as shown by the arrows, it passes through the second notch 53a and the many slots 27 formed at the other end of the second end portion 22 of the second main body 20, and from the resin tube 19 side to the conduit 40. The fluid flows into the fuel tank, and the increase in internal pressure of the fuel tank is suppressed.
[0025]
When the pressure in the fuel tank becomes negative, as shown in FIG. 8, the flange-shaped first contact portion 53 of the valve body 51 naturally contacts the first valve seat 14 by the first spring 54, and the first Since the check valve 50 is closed, the second contact portion 61 overcomes the second spring 62 by negative pressure and is sucked to the other side, and the second check valve 60 is opened. As a result, the air on the conduit 40 side passes through the hole formed in the second valve seat 55 as shown by the arrow, and then passes through the first notch 52a formed in the cylindrical portion 52 of the valve body 51. Then, it flows into the fuel tank through the resin tube 19, and the negative pressure of the fuel tank is relieved.
[0026]
As explained above, Reference example The connector according to the first and second check valves 50 and 2 in the first main body 10 and the second main body 20 in cooperation with the cylindrical first main body 10 and the second main body 20. Since the stop valve 60 is coaxial and the second contact portion 61 is accommodated concentrically in the valve body 51, the positive pressure valve and the negative pressure valve can be easily and compactly connected.
[0027]
Next, First embodiment Will be described with reference to FIGS.
In this embodiment, the above Reference example On the other hand, the structure of the first check valve and the second check valve is changed. The first check valve 70 has a structure in which a valve body 71 is different from the first check valve 50. As shown in FIGS. 10 and 11, the valve body 71 includes a cylindrical portion 72 slidable along the small diameter hole 12 a of the first main body 10, and a cylindrical portion 72 for contacting the first valve seat 14. An annular first abutting portion 73 comprising an annular flange projecting from the outer periphery of one end is provided.
[0028]
The cylindrical portion 72 is a plurality of first sliding pieces extending in the axial direction from a plurality of locations in the circumferential direction at the other end of the first contact portion 73, and a plurality of spaces between the first sliding pieces are provided between the first sliding pieces. It is a notch 72a. Therefore, when the valve body 71 is opened, the fluid on the flow hole 13a side of the first main body 10 easily flows from the small diameter hole 12a to the large diameter hole 11a side through the notch 72a. The first abutting portion 73 has an outer diameter smaller than that of the first abutting portion 53. Therefore, a large gap is provided between the outer peripheral edge and the large-diameter hole 11a. The fluid can flow smoothly. Therefore, the notch provided in the first contact portion 53 is not provided on the outer peripheral edge of the first contact portion 73. Further, the first abutting portion 73 is an annular protrusion 74 having a wedge-shaped cross section with a sharp tip protruding toward the first valve seat 14 on the abutting surface side with the first valve seat 14.
[0029]
The second check valve 80 includes a second valve seat 75 that is an annular concave curved surface formed in the inner peripheral surface of one end of the cylindrical valve body 71 of the first check valve 70 and extending in the radial direction. The cap-shaped second contact portion 81 that contacts the second valve seat 75 and the second contact portion 81 that urges the second contact portion 81 so that the second contact portion 81 contacts the second valve seat 75. 2 springs 62. As shown in FIGS. 12 and 13, the second abutting portion 81 is a substantially hemispherical cap-like abutting portion, and a circular open end portion (the other end portion) of the abutting portion has a circumference thereof. The sliding portion 82 is formed integrally with a plurality of second sliding pieces that extend slightly outward in the radial direction from four locations in the direction and are bent at the distal end side and extend in the axial direction. The outer diameter of the sliding portion 82 is substantially the same as the outer diameter of the cylindrical portion 72, and is coaxially disposed so as to be positioned between the notches 72 a of the cylindrical portion 72. The main body 10 can slide along the small-diameter hole 12a.
[0030]
the above First embodiment According to this, since the force in the other axial direction applied to the valve body 71 is concentrated on the tip of the protrusion 74, close contact between the protrusion 74 and the first valve seat 14 is ensured. As a result, the sealing performance between the valve body 71 and the first valve seat 14 is improved. Further, the small-diameter hole 12a of the first main body 10 has a common sliding surface of the cylindrical portion 72 first sliding piece of the first check valve 70 and the sliding portion 82 of the second check valve 80. Thus, the sliding surfaces that require high-precision machining for smoothly sliding the cylindrical portion 72 and the sliding portion 82 can be collected in one place. As a result, the structure of the connector can be made compact and the manufacturing cost can be reduced.
[0031]
Next, Second embodiment Will be described with reference to FIGS. Also in this embodiment, the above Reference example as well as First embodiment On the other hand, the structure of the first check valve and the second check valve is changed.
The first check valve 90 has a structure in which the first valve seat 17 and the valve body 91 are different from the first check valve 50, and the first spring 54 is the same. . As shown in FIG. 14, the first valve seat 17 protrudes from the vertical inner wall surface at the boundary between the large diameter hole 11 a and the small diameter hole 12 a toward one end side, and the distal end surface thereof is directed from one end side toward the other end side. As a result, the inner diameter is reduced and the cross section is a concave curved surface having an arc shape.
[0032]
As shown in FIGS. 15 and 16, the valve body 91 includes a cylindrical portion 92 slidable along the small diameter hole 12 a of the first main body 10, and a cylindrical portion 92 for contacting the first valve seat 17. An annular first abutting portion 93 made of an annular flange protruding from the outer periphery of one end is provided. The cylindrical portion 92 is a plurality of first sliding pieces extending in the axial direction from a plurality of locations in the circumferential direction at the other end of the first contact portion 93, and a plurality of spaces between the first sliding pieces are provided between the first sliding portions. It is a notch 92a. The first contact portion 93 has an outer diameter that is substantially the same as the outer diameter of the outer peripheral surface of the first valve seat 17, and the outer peripheral portion has a curvature corresponding to the concave curved surface 17 a at the tip of the first valve seat 17. The convex curved surface 93 a comes into close contact with the concave curved surface of the first valve seat 17 when it comes into contact with the first valve seat 17.
[0033]
The second check valve 100 has substantially the same configuration as that of the second check valve 80, and an annular second valve seat provided on the tubular valve body 91 of the first check valve 90. 95, a cap-shaped second contact portion 101 that contacts the second valve seat 95, and the second contact portion 101 to urge the second contact portion 101 to contact the second valve seat 95. And a second spring 62. The second abutting portion 101 is a substantially hemispherical cap-like abutting portion, and a protruding piece 102a slightly extending in the radial direction from four circumferential positions on the circular open end of the abutting portion. And a sliding portion 102 formed of a plurality of second sliding pieces 102b bent in the tip direction of the protruding piece 102a and extending in the axial direction. The sliding portion 102 has the same outer diameter as the cylindrical portion 92, and is coaxially disposed so that the second sliding piece 102 b is positioned in the notch 92 a of the cylindrical portion 92, and the outer peripheral surface thereof is the first. The main body 10 can slide along the small-diameter hole 12a.
[0034]
the above Second embodiment According to this, since the area where the first valve seat 17 and the first abutting portion 93 abut, that is, the sealing area is ensured, the sealing effect is enhanced. Further, since each contact surface is only curved, it is not necessary to increase the space for expanding the seal area. Furthermore, since the contact surfaces are curved surfaces, the radial displacement of the check valves 90 and 100 is corrected, and the check valves are stably moved in the axial direction. Further, the small-diameter hole 12 a of the first main body 10 includes a first sliding piece of the cylindrical portion 92 of the first check valve 90 and a second sliding piece of the sliding portion 102 of the second check valve 100. About the effect by having become a common sliding surface with 102b, the above First embodiment It is as shown in.
[0035]
Contrary to the above embodiment, the same effect can be obtained by connecting the connector to the tank side, that is, the rollover valve side. In addition, the connector shown in the above embodiment is an example, and can be implemented in various forms without departing from the gist of the present invention.
[0036]
【The invention's effect】
According to the first aspect of the present invention, in this connector, the first check valve and the second check valve are arranged together in a cavity formed by the first body and the second body in a compact manner. Therefore, the piping can be simply configured, and the piping space is not further expanded.
[0037]
Also, Claim 1 According to the invention, the small-diameter hole of the first main body serves as a common sliding surface for the first sliding piece of the first check valve and the second sliding piece of the second check valve. Since the sliding surfaces that require high-precision processing can be collected in one place, the connector structure can be made compact and the manufacturing cost can be reduced.
[0038]
Also, above Claim 2 According to the invention, since the area where the first valve seat and the first abutting portion abut or the area where the second valve seat and the second abutting portion abut, that is, the seal area is secured widely, each check The sealing effect of the valve is enhanced. Further, since each contact surface is only curved, it is not necessary to increase the space for expanding the seal area. Further, since the contact surfaces are curved, the positional displacement of the check valve in the radial direction is corrected, and the check valve is stably moved in the axial direction.
[Brief description of the drawings]
[Figure 1] Reference example It is a front view which shows the connector which is.
FIG. 2 is a cross-sectional view of the connector at the axial position of FIG.
FIG. 3 is a cross-sectional view showing a second main body constituting the connector.
FIG. 4 is a front view showing a valve body.
FIG. 5 is a cross-sectional view taken along the line VV in FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is a cross-sectional view illustrating an operation mode when a fluid flows from the resin tube side to the conduit side.
FIG. 8 is a cross-sectional view illustrating an operation mode when a fluid flows from the conduit side to the resin tube side.
FIG. 9 First embodiment It is sectional drawing in the axial position which shows the connector which is.
FIG. 10 is a front view showing a valve body of the connector.
FIG. 11 is a cross-sectional view at the axial position showing the valve body of the connector.
FIG. 12 is a front view showing a valve body of the connector.
FIG. 13 is a cross-sectional view at the axial position showing the valve body of the connector.
FIG. 14 Second embodiment It is sectional drawing in the axial position which shows the connector which is.
FIG. 15 is a front view showing a valve body of the connector.
FIG. 16 is a cross-sectional view at the axial position showing the valve body of the connector.
FIG. 17 is a front view showing a valve body of the connector.
FIG. 18 is a cross-sectional view at the axial position showing the valve body of the connector.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... 1st main body, 11a ... Large diameter hole, 12a ... Small diameter hole, 14 ... 1st valve seat, 20 ... 2nd main body, 21 ... 1st edge part, 22 ... 2nd edge part, 30 ... Holding means, 31 ... large-diameter cylindrical portion, 32 ... small-diameter cylindrical portion, 33 ... locking portion, 34 ... engaging arm portion, 40 ... conduit, 41 ... insertion end portion, 50 ... first check valve, 51 ... Valve body, 51a ... cylinder portion, 51b ... first contact portion, 52 ... first spring, 60 ... second check valve, 61 ... second contact portion, 62 ... second spring, 70 ... first 1 check valve, 71 ... valve body, 72 ... cylinder part, 73 ... first contact part, 75 ... second valve seat, 80 ... second check valve, 81 ... second contact part, 82 ... Sliding part 90 ... first check valve 91 ... valve element 92 ... cylinder part 93 ... first contact part 95 ... second valve seat 100 ... second check valve 101 ... first 2 abutting parts, 102... Sliding parts.

Claims

A cylindrical first main body having an axial hole extending from one end toward the other end;
A cylindrical second body having a fitting hole and coaxially connected to one end of the first body;
A cylindrical holding means having an opening at one end and provided coaxially at one end of the second main body;
An insertion end extending straight and having an annular protrusion on an outer peripheral surface spaced from the tip by a predetermined distance; the insertion end is inserted from one end opening of the holding means; and the tip of the insertion end is A tubular conduit that can be inserted into a mating hole in the two bodies;
A first check valve and a second check valve configured in cooperation with the first main body and / or the second main body in a cavity formed by the first main body and the second main body. A check valve with a check valve,
Since the first main body is provided with the annular first valve seat of the first check valve at an axially intermediate position, a large-diameter hole having an inner diameter larger than the other end on one end side with respect to the intermediate position. A small-diameter hole is provided on the other end side adjacent to the large-diameter hole, and the holding means is inserted into the fitting hole of the second body by inserting the insertion end portion through one end opening of the holding means. An engagement means having an elastically deformable deformable portion that snap-engages with the annular projection at the insertion end when
In addition to the first valve seat, the first check valve is slidable along a small-diameter hole of the first main body, and the cylindrical portion is in contact with the first valve seat. A cylindrical valve body provided with an annular first abutting portion projecting from the outer periphery of the cylindrical valve body, and the cylindrical valve body attached to the first abutting portion to abut against the first valve seat. A first spring that is energized,
The second check valve includes an annular second valve seat formed on an inner peripheral surface of the cylindrical valve body, a second contact portion that contacts the second valve seat, and the second contact valve. is constituted by a second spring which urges the second contact portion so as to contact the contact portion to the second valve seat,
The cylindrical portion of the first check valve includes a plurality of first sliding pieces that are axially cut out at a plurality of locations in the circumferential direction and extend from the vicinity of one end toward the other end. A plurality of second sliding pieces extending in the axial direction from a plurality of locations in the circumferential direction and disposed between the first sliding pieces on the other end side of the second contact portion of the two check valves; A small-diameter hole of the first main body is a common sliding surface for the first sliding piece and the second sliding piece .

Each contact surface on which the first valve seat and the first contact portion contact each other and / or each contact surface on which the second valve seat and the second contact portion contact each have a curved shape. The connector according to claim 1, wherein the connectors can be in close contact with each other .