JP4097496B2

JP4097496B2 - Water stop structure of butterfly valve

Info

Publication number: JP4097496B2
Application number: JP2002291435A
Authority: JP
Inventors: 実澤田; 洋一郎星野
Original assignee: Cosmo Koki Co Ltd
Current assignee: Cosmo Koki Co Ltd
Priority date: 2002-10-03
Filing date: 2002-10-03
Publication date: 2008-06-11
Anticipated expiration: 2022-10-03
Also published as: JP2004125091A

Description

【０００１】
【発明の属する技術分野】
本発明は、流体管の管軸方向に穿設した挿入孔からバタフライ弁を挿入し、該バタフライ弁を９０度回動して該流体管の流れを止水するバタフライ弁の止水構造に関する。
【０００２】
【従来の技術】
例えば、水道本管等の既設流体管を不断水状態で穿孔し、この穿孔部分にバタフライ弁を挿入して既設流体管内の流れを止水して、管体の補修、取り替え等の所要の工事を行う場合に、バタフライ弁を挿入後９０度回動させて既設流体管内の流れを止水する技術が知られている（特許文献１参照）。また、穿孔部分より栓本体を縮径状態で挿入し、挿入後に、モルタル等の硬化可能な充填物を投入して栓本体を拡張して流体管の内壁に密着させるものも知られている（特許文献２参照）。
【０００３】
【特許文献１】
特開２０００−１３０６８２号公報（第４頁、図８，図１０）
【特許文献２】
特開平１０−３１１４８８号公報（第３頁、図１）
【０００４】
【発明が解決しようとする課題】
しかしながら、上記特許文献１に記載のものは、バタフライ弁が縮径状態になっていないので穿設した挿入孔にバタフライ弁を挿入するときに弁体を損傷させる恐れがあり、又、９０度回動させた止水位置において、流体管に真円度がない場合は止水能力に限界があった。一方、上記特許文献２に記載のものは、栓本体を縮径状態で挿入するので弁体を損傷させる恐れはないが、止水時に充填物を投入しなければならず、設備が大がかりとなるばかりでなく、工事完了後流体管を流通状態に戻すときは充填物を排出しなければならず、作業が繁雑であった。
【０００５】
本発明は、上記課題に鑑みてなされたもので、弁挿入時は弁体を縮径状態にして損傷を防ぎ、止水状態においては、止水ゴムを均等に押圧して、流体管に真円度がない場合でも確実に止水状態を保持できるバタフライ弁の止水構造を提供することを目的としている。
【０００６】
【課題を解決するための手段】
上記課題を達成するために、本発明のバタフライ弁の止水構造は、流体管の管軸方向に穿設した挿入孔からバタフライ弁を挿入し、該バタフライ弁を前記流体管の管軸方向に回転自在に挿通保持された弁操作棒としての中空軸を中心に９０度回動して該流体管の流れを止水するバタフライ弁の止水構造であって、前記バタフライ弁は前記中空軸に挿通され、流体管の外方に延出しているスピンドルと、前記弁操作棒先端に取り付けた弁本体と、前記スピンドルの回動に応じて上下動する該スピンドルに螺合したネジ駒と、前記ネジ駒の上下動に応じて弁本体の円周方向に配置した止水ゴムを流体管の内面に押圧、又は押圧解除する拡張リンクから成ることを特徴としている。
この特徴によれば、止水ゴムに対する押圧を解除して挿入孔からバタフライ弁を挿入できるので弁体の損傷が防げ、止水位置では止水ゴムを流体管の内面に押圧できるので確実な止水効果が得られる。
【０００７】
本発明のバタフライ弁の止水構造において、前記拡張リンクは弁本体に枢着された一対の揺動体であることが好ましい。
このようにすれば、揺動体の揺動運動という単純な機構で確実に止水ゴムを作動させることができる。
【０００８】
本発明のバタフライ弁の止水構造において、前記ネジ駒は前記スピンドルの回動方向に対して互いに近接もしくは離反する１対の駒から成り、前記拡張リンクは前記一対のネジ駒の離反によって止水ゴムを流体管の内面に押圧し、一対のネジ駒の近接により前記押圧を解除できるようにすることが好ましい。
このようにすれば、一対のネジ駒の近接もしくは離反距離が相等しいので、均等な止水ゴムの押圧が実現できる。
【０００９】
本発明のバタフライ弁の止水構造において、前記拡張リンクは円周方向に均等に配置された４つのリンクから成り、前記ネジ駒の近接、離反に対して半径方向に可動に支持されていることが好ましい。
このようにすれば、４つのリンクの半径方向の拡張作用でより均一な押圧力を止水ゴムに与えることができる。
【００１０】
本発明のバタフライ弁の止水構造において、前記バタフライ弁を挿入孔より挿入後、弁本体が止水位置となる弁操作棒の９０度までの回動は、前記スピンドルの回動に伴う弁操作棒の連れ回りで行い、前記スピンドルの９０度を超える回動はネジ駒の移動に変換されることが好ましい。
このようにすれば、９０度回動した弁本体の止水位置で止水ゴムの押圧作用が自動的に開始されるので、止水作業が容易に行える。
【００１１】
本発明のバタフライ弁の止水構造において、前記スピンドルと前記弁操作棒はロックピンを介して連結され、前記スピンドルに旋回部材を装着することで該ロックピンが作動して該弁操作棒の回動が許容されることが好ましい。
このようにすれば、スピンドルに旋回部材を装着しない限り弁操作棒の回動ができないので、むやみに止水弁が働くことはない。
【００１２】
本発明のバタフライ弁の止水構造において、前記弁操作棒は前記流体管に取り付けた弁支持部材に設けた回動規制部材により９０度以上の回動が阻止されていることが好ましい。
このようにすれば、バタフライ弁が流体管軸方向に対して止水位置となる９０度の範囲までしか回動できないので、挿入位置と止水位置の位置決めが確実に設定できる。
【００１３】
【発明の実施の形態】
以下、本発明の実施例を図面に基づいて説明する。
【００１４】
図１〜図３は、本発明の一実施形態を示すもので、図１は本発明に係るバタフライ弁の閉鎖状態において、止水構造により既設流体管を止水した状態を示す断面図、図２は図１のＡ−Ａ断面図、図３の（ａ）はバタフライ弁の開閉操作機構を示す断面図であり、（ｂ）は（ａ）の平面図である。
【００１５】
図１及び図２に示す符号１は既設流体管を示し、既設流体管１（以下水道本管と称する）における上部側壁には後述するバタフライ弁６を挿入するための楕円形のバタフライ弁挿入孔Ｈが管軸方向に穿設されると共に、水道本管１の内壁底面にはバタフライ弁挿入孔Ｈの長手方向中心にバタフライ弁軸支持穴ｈが穿設される。
【００１６】
水道本管１のバタフライ弁挿入孔Ｈの外周には密閉ハウジング２が装着されており、この密閉ハウジング２は、水道本管１の下面外周に装着される半円弧状に形成された所定長さの下部ハウジング４と、水道本管１を挟んで水道本管１の上面外周に下部ハウジング４と対向配置された半円弧状の上部ハウジング５とから構成され、下部ハウジング４と上部ハウジング５を連結することで水道本管１の上下外周が液密に密閉される。
【００１７】
上部ハウジング５には、断面楕円形状の筒体８が上方に突設して、その上端に形成された開口端外周にはフランジ８ａが設けられ、筒体８の上部開口を通してバタフライ弁６が水道本管１の内部に挿入された際に、バタフライ弁挿入装置の下部に取付けられたバタフライ弁支持部材１０が図２に示す筒体８上部の大径段付き筒体８ｂ内に液密に挿嵌支持されたところで、バタフライ弁支持部材１０からバタフライ弁挿入装置が取り外されると同時に、バタフライ弁支持部材１０の上面がフランジ１２を介して筒体８上端のフランジ８ａに取付けられて液密に保持される。
【００１８】
詳しくは、バタフライ弁支持部材１０の上部にはバタフライ弁操作装置１４が設けられると共に、その下部にはバタフライ弁６が水道本管１内部に差し込まれた際にバタフライ弁挿入孔Ｈを密閉する楕円形状のシール装置１５が設けられており、バタフライ弁支持部材１０の中央には弁操作棒としての段付き中空軸１６が回転自在に挿通保持されると共に、この段付き中空軸１６はバタフライ弁操作装置１４よりシール装置１５を挿通して下方まで延びている。
【００１９】
シール装置１５は、バタフライ弁支持部材１０の直下に一対のネジ軸５６ａ、５６ｂを介して固定され中央に段付き中空軸１６及びスピンドル３６（図２参照）が挿通した押圧体５８と、押圧体５８の下面に装着されバタフライ弁挿入孔Ｈの周囲並びにスピンドル３６の外周をシールするゴム状のシール部材６０とから構成されている。
【００２０】
また、バタフライ弁操作装置１４は、図３（ａ）、（ｂ）に示すように、バタフライ弁回動規制部材２０と、クラッチ部材３０とから成り、バタフライ弁回動規制部材２０は、バタフライ弁支持部材１０の上面中央に取付けられ、段付き中空軸１６を挿通保持する円板状のリテーナ１８と、このリテーナ１８の上部周縁に約９０度の円弧状に立設した平面視扇形の側壁２１と、この側壁上部に円弧に沿って形成された天板２２と、側壁２１の両端に形成された当接壁２４ａ、２４ｂとから構成されている。
【００２１】
前記リテーナ１８より上方に挿通突出した段付き中空軸１６には揺動レバー３２が挿通し、この揺動レバー３２は、左右一対の枢支軸３４ａ、３４ｂを介して段付き中空軸１６に揺動可能に枢支され、揺動レバー３２の一端には当接部３２ａが形成されると共に、その他端にはロックピンとしての操作軸３５がヒンジピン３７にて枢着されている。
【００２２】
段付き中空軸１６の上端からはスピンドル３６が挿通突出し、その上端には旋回部材としての旋回部材４０下端の装着穴に装着可能なテーパ状のホルダ３８が固定され、ホルダ３８の直下にはクラッチ部材３０が配設されている。
【００２３】
クラッチ部材３０は、ホルダ３８の直下に密着した状態でスピンドル３６に固定されたクラッチ板４２と、段付き中空軸１６の上端に挿嵌固定した支持リング５０と、この支持リング５０上面に支持された受け板４５ａに複数の圧縮ばね５２を介して上方に押圧付勢される押圧板４５ｂとから構成されており、クラッチ板４２は複数の硬球４４を介して押圧板４５ｂにより上方に押圧され、段付き中空軸１６はスピンドル３６に対して圧縮ばね５２による押圧力に打ち勝つと、相対回転し得るようになっている。
【００２４】
また、押圧板４５ｂの側面から半径方向に突出した突出部４６には、揺動レバー３２他端の突出部３２ｂを挿通しヒンジピン３７を介して枢着された操作軸３５が圧縮ばね４８により上方に押圧付勢されて操作軸３５の頭部３５ａが上方に突出し、操作軸３５下端に枢着された揺動レバー３２の当接部３２ａを下方に押し下げた状態（図３ａにおいて２点鎖線で示されている）に維持している。
【００２５】
この状態で、テーパ状のホルダ３８に旋回部材４０が装着された際、旋回部材４０の下端が操作軸３５の頭部３５ａを圧縮ばね４８に抗して押し下げることで、揺動レバー３２一端の当接部３２ａを上方に押上げて水平状態が保持されるようになっている。
【００２６】
次に、バタフライ弁の構造に付き説明する。バタフライ弁６は、図示しないバタフライ弁挿入装置によりバタフライ弁挿入孔Ｈを通して水道本管１の内部に差し込まれた状態では図１に示す仮想線の状態（開弁状態）で収容される。図１及び図２に示すバタフライ弁６は、仮想線の状態から９０度回動して水道本管１が閉塞された状態を示している。
【００２７】
このバタフライ弁６は、図２に示すように、中央連結部材６８とこれと一体化した円弧状に形成された上下部連結部材７０ａ、７０ｂから成る弁本体７と、４分割された所定厚みのリンク片６２ａ、６２ｂ、６２ｃ、６２ｄから成る拡張リンク６２と、拡張リンク６２の外周に装着された環状の止水ゴムＧとで構成されている。
【００２８】
拡張リンク６２の上方にある左右のリンク片６２ａ、６２ｂはその中心に向けて突出したアーム６４を有し、このアーム６４はそれぞれ上部ネジ駒６６ａに設けた左右の枢支ピン６５に軸着されている。上部ネジ駒６６ａはアーム６４を両側から挟持すると共に、枢支ピン６５が水平方向に移動できる長穴６７が形成されている。
【００２９】
そして上部ネジ駒６６ａが上方に移動すると枢支ピン６５が上方に移動しながら長穴６７の外方に逃げることができるので、リンク片６２ａ、６２ｂは半径方向外方に駆動される。逆に上部ネジ駒６６ａが下方に移動すると枢支ピン６５が下方に移動しながら長穴６７の内方に逃げることができるので、リンク片６２ａ、６２ｂは半径方向内方に駆動される。
【００３０】
拡張リンク６２の下方にある左右のリンク片６２ｃ、６２ｄは同様に、その中心に向けて突出したアーム６４を有し、このアーム６４はそれぞれ下部ネジ駒６６ｂに設けた左右の枢支ピン６５に軸着されている。下部ネジ駒６６ｂはアーム６４を両側から挟持すると共に、枢支ピン６５が水平方向に移動できる長穴６７が形成されている。そして左右のリンク片６２ｃ、６２ｄは上方のリンク片６２ａ、６２ｂとは反対に、下部ネジ駒６６ｂの下方移動で半径方向外方に、上方移動で半径方向内方に駆動されることになる。
【００３１】
弁本体７の止水ゴムＧを挟んだ両側面には、図１に示すように、例えばネジを介して一対の止水ゴムＧの外径より若干小径に形成された円板状カバー７４ａ、７４ｂが取着されている。この円板状カバー７４ａ、７４ｂには枢支ピン６５の両端を所定範囲で放射方向に案内支持する４本の放射溝７２が形成されている。
【００３２】
シール部材６０の中央に挿通保持されたガイドブッシュ７６には、段付き中空軸１６の下端が挿通保持されると共に、その中空軸１６の端部は上部連結部材７０ａに連結されている。下部に配設されたガイドブッシュ７８ないし下部ハウジング４のバタフライ弁軸支持穴ｈには下部連結部材７０ｂと連結した受部材８２が保持されている。
【００３３】
また、図２に示すように、段付き中空軸１６の下端から下方に延出したスピンドル３６の下端が受部材８２の上部に形成された支持穴内に回転自在に挿嵌保持されており、スピンドル下部３６ａの上下に螺設された正逆の雄ネジが上下のネジ駒６６ａ、６６ｂ中央に形成された正逆の雌ネジにそれぞれ螺合し、スピンドル３６の一方向の回転によりネジ駒６６ａ、６６ｂを互いに接近、離間できるように構成されている。
【００３４】
次に、上記のように構成されたバタフライ弁の止水作用に付き説明する。
【００３５】
先ず、図１に示すように、水道本管１の上部側壁に形成された楕円形のバタフライ弁挿入孔Ｈを通して図示しないバタフライ弁挿入装置を用いてバタフライ弁６が水道本管１の内部に挿入される。
【００３６】
バタフライ弁６が水道本管１内に仮想線で示す開弁状態で挿入されると同時に、バタフライ弁支持部材１０が大径段付き筒体８ｂ内に挿嵌支持され、バタフライ弁挿入孔Ｈがシール部材６０により密閉閉塞される。
【００３７】
次に、バタフライ弁挿入装置がバタフライ弁支持部材１０から取り外されるときは、バタフライ弁支持部材１０の上面がフランジ１２を介して筒体８上端のフランジ８ａに取り付けられて液密に保持される。
【００３８】
バタフライ弁６の挿入によって、スピンドル下部３６ａの下端は、図２に示すように受部材８２上部の支持穴内に回転自在に挿嵌保持され、この状態における揺動レバー３２の当接部３２ａは、圧縮ばね４８により上方に付勢される操作軸３５を介して下方に位置しており、当接部３２ａは、図３の（ａ）に示すバタフライ回動規制部材１０の一方の当接壁２４ａに当接した状態で、当接壁２４ａから所定距離離間した近傍位置に内方に向けて突設した規制ピン５４により、揺動レバー３２の弁軸まわりの回転が阻止されている。
【００３９】
次に、スピンドル３６上端のテーパ状ホルダ３８に旋回部材４０を装着することで、旋回部材４０の下端が操作軸３５上端の頭部３５ａに当接し、操作軸３５が圧縮ばね４８の付勢力に抗して下方に移動することで、揺動レバー３２の当接部３２ａ上方に揺動して規制ピン５４による回動規制から開放される。
【００４０】
水平状態となった揺動レバー３２は、揺動レバー３２の回転規正が解除されて当接部３２ａの上端が剣先形状に形成された位置決めボルト２５ａ下端に係合して位置決め保持されている。
【００４１】
これにより、段付き中空軸１６は回転が可能な状態となり、操作ハンドル４０ａにより旋回部材４０を回転操作することで、揺動レバー３２を介して当接部３２ａは他方の当接部２４ｂに当接するまで（丁度９０度）回転することができ、これにより弁本体７が中空軸１６により駆動され、バタフライ弁６は図１及び図２に示す閉塞位置まで回転する。
【００４２】
段付き中空軸１６は、当接部２４ｂとの当接により回転が規制された状態となるが、旋回部材４０を更に回動させるとクラッチ部材３０が作用して回動が規制されている段付き中空軸１６に対し、圧縮ばね５２を介して上方に押圧付勢される押圧板４５ｂに対しスピンドル３６と一体化したクラッチ板４２が複数の硬球４４を介して相対回転する。
【００４３】
これによるスピンドル３６の一方向回動により、上下のネジ駒６６ａ、６６ｂが互いに離れる方向に平行移動することで４本の枢支ピン６５が放射方向外方に移動し、４分割されたリンク片６２ａ、６２ｂ、６２ｃ、６２ｄは４本の枢支ピン６５によって拡径方向に移動する。
【００４４】
従って、リンク片６２ａ、６２ｂ、６２ｃ、６２ｄで構成される拡張リンク６２の外周に装着された環状の止水ゴムＧが拡径されて、水道本管１の内壁を押圧しバタフライ弁６の外周が密閉される。
【００４５】
この状態で、旋回部材４０がテーパ状ホルダ３８から引き抜かれると、操作軸３５が圧縮ばね４８の作用で上方に移動して、揺動レバー３２の当接部３２ａを下降させることで他方の当接壁２４ｂに当接した当接部３２ａが図３（ａ）で示した規制ピン５４と同様な規制ピン（図示せず）と当接壁２４ｂとの間で挟まれて、揺動レバー３２の弁軸まわりの回動が規制されバタフライ弁６による水道本管１内壁の閉塞状態が維持される。
【００４６】
次いで、水道本管１の閉塞状態を解除する際は、バタフライ弁６を反対方向に９０度回動させる操作が行われる。そこで、バタフライ弁６を９０度反転するに際しテーパ状のホルダ３８に旋回部材４０下端の装着穴を装着して、揺動レバー３２を水平状態に揺動させて規制ピンから外し、段付き中空軸１６を回動可能な状態にする。しかしバタフライ弁６外周の止水ゴムＧによる水道本管１内壁への押圧力で段付き中空軸１６の回動に対し負荷が作用するため、クラッチ部材３０が作用してスピンドル３６のみが最初に反対方向に回動する。
【００４７】
スピンドル３６の反対方向の回動により、上下のネジ駒６６ａ、６６ｂが互いに接近する方向に平行移動することで４本の枢支ピン６５がバタフライ弁６の中心に向けて放射方向内方に移動し、４分割されたリンク片６２ａ、６２ｂ、６２ｃ、６２ｄは４本の枢支ピン６５によって縮径方向に移動する。
【００４８】
この止水ゴムＧの縮経によって、水道本管１内壁への押圧力が次第に減少するとバタフライ弁６の反対方向の回動が可能となり、揺動レバー３２の当接部３２ａが一方の当接壁２４ａに当接するまで段付き中空軸１６が反転してバタフライ弁６が開放され、当接後はクラッチ部材３０が作用してスピンドル３６のみが作用してネジ駒６６ａ、６６ｂが移動し、４分割されたリンク片６２ａ、６２ｂ、６２ｃ、６２ｄが充分縮径した後に、旋回部材４０をホルダ３８から引き抜くことで、下方に移動した当接部３２ａは規制ピン５４と当接壁２４ａとの間で挟まれてバタフライ弁６の開放状態が維持される。
【００４９】
従って、上記の実施形態ようにバタフライ弁の止水構造によれば、バタフライ弁６が、水道本管１の外方に延出している段付き中空軸１６及びスピンドル３６と、段付き中空軸１６の先端に取り付けたバタフライ弁本体７と、スピンドル３６に螺合され、このスピンドル３６の回動に応じて上下動するネジ駒６６ａ、６６ｂと、これらネジ駒６６ａ、６６ｂの上下動に応じてバタフライ弁本体７の円周方向に配置した止水ゴムＧを水道本管１の内面に押圧、又は押圧解除する拡張リンク６２から構成されることにより、バタフライ弁本体７の装着時の損傷が防げ、止水位置では止水ゴムＧを水道本管１の内面に押圧できるので確実な止水効果が得られる。
【００５０】
更に、ネジ駒６６ａ、６６ｂは、スピンドル３６の回動方向に対して互いに近接もしくは離反する１対のネジ駒６６ａ、６６ｂから成り、拡張リンク６２が、一対のネジ駒６６ａ、６６ｂの離反によって止水ゴムＧを水道本管１の内面に押圧すると共に、一対のネジ駒６６ａ、６６ｂの近接により押圧が解除できるようになっており、一対のネジ駒６６ａ、６６ｂの近接もしくは離反距離が相等しくなるように構成されているので、均等な止水ゴムＧの押圧が実現できる。
【００５１】
そして拡張リンク６２は、円周方向に均等に配置された４つのリンク片６２ａ、６２ｂ、６２ｃ、６２ｄから成り、ネジ駒６６ａ、６６ｂの近接、離反に対して半径方向に可動に支持されているので、４つのリンク片６２ａ、６２ｂ、６２ｃ、６２ｄの半径方向の拡張作用でより均一な押圧力を止水ゴムＧに与えることができる。
【００５２】
そしてまた、バタフライ弁６を、楕円形のバタフライ弁挿入孔Ｈより挿入後、バタフライ弁本体７が止水位置となる段付き中空軸１６の９０度までの回動は、スピンドル３６の回動に伴う段付き中空軸１６の連れ回りで行い、スピンドル３６の９０度を超える回動はネジ駒６６ａ、６６ｂの移動に変換されるようになっているので、９０度回動したバタフライ弁本体７の止水位置で止水ゴムＧの押圧作用が自動的に開始されるので、止水作業が容易に行える。
【００５３】
更に、スピンドル３６と段付き中空軸１６は、操作軸３５を介して連結され、スピンドル３６に旋回部材４０を装着した際に操作軸３５が作動して段付き中空軸１６の回動が許容されるようになっており、スピンドル３６に旋回部材４０を装着しない限り段付き中空軸１６の回動ができないので、不用意にバタフライ弁６が働くようなことはない。
【００５４】
また、段付き中空軸１６は、水道本管１の上部ハウジング５から突出した筒体８内に液密に挿嵌支持されたバタフライ弁支持部材１０に設けた当接壁２４ａ、２４ｂにより９０度以上の回動が阻止されるように構成されているので、バタフライ弁６の挿入位置と止水位置の位置決めを確実に設定できる。
【００５５】
次に、他の実施形態に係るバタフライ弁の止水構造における止水ゴムの拡径機構に付き図４を参照して説明する。図４は他の実施形態に係るバタフライ弁の断面図である。以下、上記実施形態に係る構成部材と同一構成部材については同一符号を付して重複する説明を省略する。
【００５６】
本実施形態に係るバタフライ弁８６は、一対の枢軸９４ａ、９４ｂを有する弁本体と、この弁本体の外周に装着される環状の止水ゴムＧ′一対の枢軸９４ａ、９４ｂに軸着された揺動可能な一対の半円弧状に形成された拡径部材８４ａ、８４ｂと、両拡径部材８４ａ、８４ｂの下端に配置した台形状の駒部材８８と、この駒部材８８と螺合して駒部材を上下動するネジ軸９０とを有している。
【００５７】
従って、本実施形態に係るバタフライ弁８６が、水道本管１上部側壁のバタフライ弁挿入孔Ｈを通して水道本管１の内部に挿入されて水道本管１内を閉鎖する方向に回動した状態において、旋回部材４０によりスピンドル３６の回動によってネジ軸９０が回動することで、台形状の駒部材８８が上方に移動する。
【００５８】
この駒部材８８の上方への移動により、拡径部材８４ａ、８４ｂ下方の拡開形成されたテーパ状の両摺動面８５ａ、８５ｂがクサビ作用で押圧されて、拡径部材８４ａ、８４ｂの外周が外側に押し広げられる。これにより、止水ゴムＧ′は拡径部材８４ａ、８４ｂによる径方向の拡径作用により水道本管１の内壁を押圧し、バタフライ弁８６の外周を密閉する。
【００５９】
次に、他の実施形態に係るバタフライ弁の止水構造における止水ゴムの拡径機構に付き図５を参照して説明する。図５は他の実施形態に係るバタフライ弁の断面図である。
【００６０】
本実施形態に係るバタフライ弁９６は、一対の枢軸１００ａ、１００ｂを有する弁本体と、この弁本体の外周に装着される環状の止水ゴムＧ”と、一対の枢軸１００ａ、１００ｂに軸着された揺動可能な一対の半円弧状に形成された拡径部材９８ａ、９８ｂと、両拡径部材９８ａ、９８ｂの上端に配置した台形状の駒部材９３と、この駒部材９３と螺合して駒部材を上下動するネジ軸９０とを有している。
【００６１】
従って、上記実施形態と同様にバタフライ弁９６が、水道本管１の内部に挿入されて水道本管１内を閉鎖する方向に回動した状態において、旋回部材４０によりスピンドル３６の回動によってネジ軸９０が回動することで、台形状の駒部材９３が下方に移動する。
【００６２】
この駒部材８８の下方への移動により、拡径部材９８ａ、９８ｂ上方の拡開形成されたテーパ状の両摺動面９５ａ、９５ｂがクサビ作用で押圧されて、拡径部材９８ａ、９８ｂの外周が外側に押し広げられる。これにより、止水ゴムＧ”は拡径部材９８ａ、９８ｂによる径方向の拡径作用により水道本管１の内壁を押圧してタフライ弁９６の外周を密閉する。
【００６３】
従って、上記のように構成された他の２つの実施形態によれば、揺動体の揺動運動で確実に止水ゴムを作動させることができる。
【００６４】
【発明の効果】
本発明によれば、次のような効果が得られる。
【００６５】
（ａ）請求項１に記載の発明によれば、止水ゴムに対する押圧を解除して挿入孔からバタフライ弁を挿入できるので弁体の損傷が防げ、止水位置では止水ゴムを流体管の内面に押圧できるので確実な止水効果が得られる。
【００６６】
（ｂ）請求項２に記載の発明によれば、揺動体の揺動運動という単純な機構で確実に止水ゴムを作動させることができる。
【００６７】
（ｃ）請求項３に記載の発明によれば、一対のネジ駒の近接もしくは離反距離が相等しいので、均等な止水ゴムの押圧が実現できる。
【００６８】
（ｄ）請求項４に記載の発明によれば、４つのリンクの半径方向の拡張作用でより均一な押圧力を止水ゴムに与えることができる。
【００６９】
（ｅ）請求項５に記載の発明によれば、９０度回動した弁本体の止水位置で止水ゴムの押圧作用が自動的に開始されるので、止水作業が容易に行える。
【００７０】
（ｆ）請求項６に記載の発明によれば、スピンドルに旋回部材を装着しない限り弁操作棒の回動ができないので、むやみに止水弁が働くことはない。
【００７１】
（ｇ）請求項７に記載の発明によれば、バタフライ弁が流体管軸方向に対して止水位置となる９０度の範囲までしか回動できないので、挿入位置と止水位置の位置決めが確実に設定できる。
【図面の簡単な説明】
【図１】本発明に係るバタフライ弁の閉鎖状態において、止水構造により既設流体管を止水した状態を示す断面図である。
【図２】図１のＡ−Ａ断面図である。
【図３】（ａ）はバタフライ弁の開閉操作機構を示す断面図であり、（ｂ）は（ａ）の平面図である。
【図４】他の実施形態に係るバタフライ弁の断面図である。
【図５】他の実施形態に係るバタフライ弁の断面図である。
【符号の説明】
１水道本管（流体管）
２密閉ハウジング
４下部ハウジング
５上部ハウジング
６バタフライ弁
７弁本体
８筒体
８ａフランジ
８ｂ大径段付き筒体
１０バタフライ弁支持部材
１２フランジ
１４バタフライ弁操作装置
１５シール装置
１６段付き中空軸（弁操作棒）
１８リテーナ
２０バタフライ弁回動規制部材
２１側壁
２２天板
２４ａ、２４ｂ当接壁
２５ａボルト
３０クラッチ部材
３２揺動レバー
３２ａ当接部
３２ｂ突出部
３４ａ、３４ｂ枢支軸
３５操作軸（ロックピン）
３５ａ頭部
３６スピンドル
３６ａスピンドル下部
３７ヒンジピン
３８テーパ状ホルダ
４０旋回部材
４０ａ操作ハンドル
４２クラッチ板
４４硬球
４５ａ受け板
４５ｂ押圧板
４６突出部
５０支持リング
５４規制ピン
５６ａ、５６ｂネジ軸
５８押圧体
６０シール部材
６２拡張リンク
６２ａ、６２ｂリンク片
６２ｃ、６２ｄリンク片
６４アーム
６５枢支ピン
６６ａ、６６ｂ上部及び下部ネジ駒
６７長穴
６８中央連結部材
７０ａ上部連結部材
７０ｂ下部連結部材
７２放射溝
７４ａ、７４ｂ円板状カバー
７６、７８ガイドブッシュ
７７支持穴
８２受部材
８４ａ、８４ｂ拡径部材（拡張リンク）
８５ａ、８５ｂ摺動面
８６、９６バタフライ弁
８８、９３駒部材
９０ネジ軸
９４ａ、９４ｂ枢軸
９５ａ、９５ｂ摺動面
９８ａ、９８ｂ拡径部材（拡張リンク）
１００ａ、１００ｂ枢軸
Ｇ、Ｇ′、Ｇ” 止水ゴム
ｈバタフライ弁軸支持穴
Ｈバタフライ弁挿入孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water stop structure for a butterfly valve in which a butterfly valve is inserted from an insertion hole formed in the pipe axis direction of a fluid pipe, and the butterfly valve is rotated 90 degrees to stop the flow of the fluid pipe.
[0002]
[Prior art]
For example, an existing fluid pipe such as a water main pipe is drilled in an indefinite state of water, a butterfly valve is inserted into this drilled part, the flow in the existing fluid pipe is stopped, and the necessary work such as repairing or replacing the pipe body When performing the above, a technique is known in which the butterfly valve is inserted and turned 90 degrees to stop the flow in the existing fluid pipe (see Patent Document 1). Further, it is also known that a plug main body is inserted in a reduced diameter state from a perforated portion, and after insertion, a curable material such as mortar is inserted to expand the plug main body and adhere to the inner wall of the fluid pipe ( Patent Document 2).
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-130682 (page 4, FIG. 8, FIG. 10)
[Patent Document 2]
Japanese Patent Laid-Open No. 10-311488 (page 3, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, since the butterfly valve is not in a reduced diameter state, the one described in Patent Document 1 may damage the valve body when the butterfly valve is inserted into the drilled insertion hole. If the fluid pipe has no roundness at the moved water stop position, the water stop ability was limited. On the other hand, although the thing of the said patent document 2 inserts a plug main body in a diameter-reduced state, there is no possibility of damaging a valve body, but a filler must be thrown in at the time of water stop, and an installation becomes large. In addition, when the fluid pipe is returned to the circulation state after the completion of the work, the filling must be discharged, and the work is complicated.
[0005]
The present invention has been made in view of the above-mentioned problems.When the valve is inserted, the valve body is reduced in diameter to prevent damage. In the water stop state, the water stop rubber is pressed evenly to It aims at providing the water stop structure of a butterfly valve which can hold a water stop state certainly even when there is no roundness.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a water stop structure for a butterfly valve according to the present invention is configured such that a butterfly valve is inserted from an insertion hole drilled in a tube axis direction of a fluid pipe, and the butterfly valve is Centering on a hollow shaft as a valve operating rod inserted and held rotatably in the tube axis direction of the fluid tube A butterfly valve water stop structure that rotates 90 degrees to stop the flow of the fluid pipe, It is inserted through the hollow shaft and extends outward from the fluid pipe. A spindle, a valve body attached to the tip of the valve operating rod, a screw piece screwed to the spindle that moves up and down according to the rotation of the spindle, and a circumferential direction of the valve body according to the up and down movement of the screw piece It is characterized by comprising an expansion link for pressing or releasing the water stop rubber disposed on the inner surface of the fluid pipe.
According to this feature, the butterfly valve can be inserted from the insertion hole by releasing the pressure on the water stop rubber, so that the valve body can be prevented from being damaged, and the water stop rubber can be pressed against the inner surface of the fluid pipe at the water stop position. Water effect is obtained.
[0007]
In the water stop structure of the butterfly valve according to the present invention, it is preferable that the expansion link is a pair of swinging bodies pivotally attached to the valve body.
If it does in this way, a water stop rubber can be operated reliably with a simple mechanism called rocking motion of a rocking body.
[0008]
In the water stop structure of the butterfly valve according to the present invention, the screw piece is composed of a pair of pieces that are close to or separated from each other with respect to the rotation direction of the spindle, and the expansion link is formed by a water stop rubber by the separation of the pair of screw pieces. Is preferably pressed against the inner surface of the fluid pipe so that the pressing can be released by the proximity of a pair of screw pieces.
In this way, since the proximity or separation distance between the pair of screw pieces is the same, uniform pressing of the water stop rubber can be realized.
[0009]
In the water stop structure of the butterfly valve according to the present invention, the expansion link is composed of four links arranged uniformly in the circumferential direction, and is supported so as to be movable in the radial direction with respect to the proximity and separation of the screw piece. preferable.
If it does in this way, more uniform pressing force can be given to water stop rubber by the expansion action of the radial direction of four links.
[0010]
In the water stop structure of the butterfly valve according to the present invention, after the butterfly valve is inserted through the insertion hole, the valve operating rod whose valve body is in the water stop position is rotated up to 90 degrees by the valve operation accompanying the rotation of the spindle. It is preferable that the rotation of the spindle exceeding 90 degrees is converted into the movement of the screw piece.
In this way, the pressing action of the water stop rubber is automatically started at the water stop position of the valve body rotated 90 degrees, so that the water stop work can be easily performed.
[0011]
In the water stop structure for a butterfly valve according to the present invention, the spindle and the valve operating rod are connected via a lock pin, and the lock pin is actuated by mounting a turning member on the spindle to rotate the valve operating rod. It is preferable that movement is allowed.
In this way, the valve operating rod cannot be rotated unless the swivel member is mounted on the spindle, so that the water stop valve does not work unnecessarily.
[0012]
In the water stop structure of the butterfly valve according to the present invention, it is preferable that the valve operating rod is prevented from turning 90 degrees or more by a turning restricting member provided on a valve support member attached to the fluid pipe.
In this way, the butterfly valve can only be rotated up to a range of 90 degrees that is the water stop position with respect to the fluid pipe axis direction, so that the positioning of the insertion position and the water stop position can be reliably set.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
1 to 3 show an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a state in which an existing fluid pipe is stopped by a water stop structure in a closed state of a butterfly valve according to the present invention. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3A is a cross-sectional view showing the opening / closing operation mechanism of the butterfly valve, and FIG. 3B is a plan view of FIG.
[0015]
Reference numeral 1 shown in FIGS. 1 and 2 denotes an existing fluid pipe, and an elliptical butterfly valve insertion hole for inserting a butterfly valve 6 (to be described later) into an upper side wall of the existing fluid pipe 1 (hereinafter referred to as a main water pipe). H is drilled in the pipe axis direction, and a butterfly valve shaft support hole h is drilled in the longitudinal center of the butterfly valve insertion hole H on the bottom of the inner wall of the water main pipe 1.
[0016]
A sealed housing 2 is attached to the outer periphery of the butterfly valve insertion hole H of the water main pipe 1, and this sealed housing 2 has a predetermined length formed in a semicircular arc shape that is attached to the outer periphery of the lower surface of the water main pipe 1. The lower housing 4 and a semicircular arc-shaped upper housing 5 disposed opposite to the lower housing 4 on the outer periphery of the upper surface of the water main pipe 1 with the water main pipe 1 interposed therebetween. The lower housing 4 and the upper housing 5 are connected to each other. By doing so, the upper and lower outer circumferences of the water main pipe 1 are liquid-tightly sealed.
[0017]
A cylindrical body 8 having an elliptical cross section projects upward from the upper housing 5, and a flange 8 a is provided on the outer periphery of the opening end formed at the upper end of the cylindrical body 8. When inserted into the main pipe 1, the butterfly valve support member 10 attached to the lower part of the butterfly valve insertion device is liquid-tightly inserted into the large diameter stepped cylinder 8b at the upper part of the cylinder 8 shown in FIG. When the butterfly valve insertion device is removed from the butterfly valve support member 10, the upper surface of the butterfly valve support member 10 is attached to the flange 8 a at the upper end of the cylindrical body 8 via the flange 12 to be kept fluid-tight. Is done.
[0018]
Specifically, a butterfly valve operating device 14 is provided at the upper part of the butterfly valve support member 10, and an ellipse that seals the butterfly valve insertion hole H when the butterfly valve 6 is inserted into the water main pipe 1 at the lower part thereof. A sealing device 15 having a shape is provided, and a stepped hollow shaft 16 as a valve operating rod is rotatably inserted and held in the center of the butterfly valve support member 10, and the stepped hollow shaft 16 is operated by the butterfly valve. The seal device 15 is inserted from the device 14 and extends downward.
[0019]
The sealing device 15 includes a pressing body 58 that is fixed directly below the butterfly valve support member 10 via a pair of screw shafts 56a and 56b, and a stepped hollow shaft 16 and a spindle 36 (see FIG. 2) are inserted in the center. The rubber seal member 60 is attached to the lower surface of 58 and seals the periphery of the butterfly valve insertion hole H and the outer periphery of the spindle 36.
[0020]
As shown in FIGS. 3A and 3B, the butterfly valve operating device 14 includes a butterfly valve rotation restricting member 20 and a clutch member 30. The butterfly valve rotation restricting member 20 is a butterfly valve. A disk-shaped retainer 18 that is attached to the center of the upper surface of the support member 10 and that inserts and holds the stepped hollow shaft 16, and a fan-shaped side wall 21 that is erected in an arc shape of about 90 degrees on the upper periphery of the retainer 18. And a top plate 22 formed along the circular arc at the upper part of the side wall, and contact walls 24 a and 24 b formed at both ends of the side wall 21.
[0021]
A swing lever 32 is inserted into the stepped hollow shaft 16 that is inserted and protruded upward from the retainer 18, and this swing lever 32 swings to the stepped hollow shaft 16 via a pair of left and right pivot shafts 34a and 34b. An abutting portion 32a is formed at one end of the swing lever 32, and an operation shaft 35 as a lock pin is pivotally attached to the other end by a hinge pin 37.
[0022]
A spindle 36 is inserted and protruded from the upper end of the stepped hollow shaft 16, and a tapered holder 38 that can be mounted in a mounting hole at the lower end of the turning member 40 is fixed to the upper end of the stepped hollow shaft 16. A member 30 is disposed.
[0023]
The clutch member 30 is supported by a clutch plate 42 fixed to the spindle 36 in close contact with the holder 38, a support ring 50 inserted and fixed to the upper end of the stepped hollow shaft 16, and an upper surface of the support ring 50. The clutch plate 42 is pressed upward by the pressing plate 45b through the plurality of hard balls 44, and the pressing plate 45b is pressed upwardly by the receiving plate 45a through the plurality of compression springs 52. The stepped hollow shaft 16 can rotate relative to the spindle 36 when the pressing force of the compression spring 52 is overcome.
[0024]
In addition, an operating shaft 35 that is inserted through a protruding portion 32 b at the other end of the rocking lever 32 and pivotally attached via a hinge pin 37 to the protruding portion 46 that protrudes in the radial direction from the side surface of the pressing plate 45 b is moved upward by a compression spring 48. The head 35a of the operation shaft 35 protrudes upward and is pressed downward, and the contact portion 32a of the swing lever 32 pivotally attached to the lower end of the operation shaft 35 is pressed downward (in FIG. As shown).
[0025]
In this state, when the turning member 40 is mounted on the tapered holder 38, the lower end of the turning member 40 pushes down the head portion 35 a of the operation shaft 35 against the compression spring 48, thereby The abutting portion 32a is pushed upward to maintain the horizontal state.
[0026]
Next, the structure of the butterfly valve will be described. When the butterfly valve 6 is inserted into the water main pipe 1 through the butterfly valve insertion hole H by a butterfly valve insertion device (not shown), the butterfly valve 6 is accommodated in the state of the phantom line (opened state) shown in FIG. The butterfly valve 6 shown in FIG.1 and FIG.2 has shown the state which rotated 90 degree | times from the state of the virtual line, and the water main pipe 1 was obstruct | occluded.
[0027]
As shown in FIG. 2, the butterfly valve 6 includes a central body 68 and a valve body 7 composed of upper and lower connecting members 70a and 70b formed in an arc shape integrated with the central connecting member 68, and a predetermined thickness divided into four parts. The expansion link 62 includes link pieces 62 a, 62 b, 62 c and 62 d, and an annular water stop rubber G attached to the outer periphery of the expansion link 62.
[0028]
The left and right link pieces 62a, 62b above the extension link 62 have arms 64 protruding toward the center thereof, and these arms 64 are respectively pivotally attached to left and right pivot pins 65 provided on the upper screw piece 66a. ing. The upper screw piece 66a sandwiches the arm 64 from both sides, and is formed with a long hole 67 through which the pivot pin 65 can move in the horizontal direction.
[0029]
When the upper screw piece 66a moves upward, the pivot pin 65 can move upward while moving upward, so that the link pieces 62a and 62b are driven radially outward. Conversely, when the upper screw piece 66a moves downward, the pivot pin 65 can move downward while escaping inward of the elongated hole 67, so that the link pieces 62a and 62b are driven radially inward.
[0030]
Similarly, the left and right link pieces 62c and 62d below the extension link 62 have arms 64 protruding toward the center thereof, and the arms 64 are respectively connected to the left and right pivot pins 65 provided on the lower screw piece 66b. It is attached to the shaft. The lower screw piece 66b sandwiches the arm 64 from both sides and is formed with an elongated hole 67 through which the pivot pin 65 can move in the horizontal direction. In contrast to the upper link pieces 62a and 62b, the left and right link pieces 62c and 62d are driven radially outward by the downward movement of the lower screw piece 66b and radially inward by the upward movement.
[0031]
As shown in FIG. 1, on both side surfaces of the valve body 7 sandwiching the water stop rubber G, for example, disk-like covers 74a formed to have a slightly smaller diameter than the outer diameter of the pair of water stop rubber G via screws, 74b is attached. The disk-shaped covers 74a and 74b are formed with four radial grooves 72 that guide and support both ends of the pivot pin 65 in a radial direction within a predetermined range.
[0032]
The lower end of the stepped hollow shaft 16 is inserted and held in the guide bush 76 inserted and held in the center of the seal member 60, and the end of the hollow shaft 16 is connected to the upper connecting member 70a. A receiving member 82 connected to the lower connecting member 70 b is held in the guide bush 78 disposed in the lower part or the butterfly valve shaft support hole h of the lower housing 4.
[0033]
As shown in FIG. 2, the lower end of the spindle 36 extending downward from the lower end of the stepped hollow shaft 16 is rotatably inserted and held in a support hole formed in the upper portion of the receiving member 82. Forward and reverse male screws screwed up and down on the lower portion 36a are respectively engaged with forward and reverse female screws formed at the center of the upper and lower screw pieces 66a and 66b, and the screw piece 66a, 66b can be moved closer to and away from each other.
[0034]
Next, the water stop function of the butterfly valve configured as described above will be described.
[0035]
First, as shown in FIG. 1, a butterfly valve 6 is inserted into the water main pipe 1 using a butterfly valve insertion device (not shown) through an elliptical butterfly valve insertion hole H formed in the upper side wall of the water main pipe 1. Is done.
[0036]
At the same time that the butterfly valve 6 is inserted into the water main pipe 1 in a valve open state indicated by a virtual line, the butterfly valve support member 10 is inserted and supported in the large-diameter stepped cylinder 8b, and the butterfly valve insertion hole H is formed. The sealing member 60 is hermetically closed.
[0037]
Next, when the butterfly valve insertion device is removed from the butterfly valve support member 10, the upper surface of the butterfly valve support member 10 is attached to the flange 8 a at the upper end of the cylinder 8 via the flange 12 and is kept fluid-tight.
[0038]
By inserting the butterfly valve 6, the lower end of the spindle lower part 36a is rotatably inserted and held in a support hole in the upper part of the receiving member 82 as shown in FIG. 2. In this state, the contact part 32a of the swing lever 32 is The contact portion 32a is positioned below the operation shaft 35 biased upward by the compression spring 48, and the contact portion 32a is one contact wall 24a of the butterfly rotation restricting member 10 shown in FIG. In the state of being in contact with the contact wall 24a, the rotation of the swing lever 32 around the valve shaft is prevented by a restriction pin 54 that protrudes inwardly in the vicinity of a predetermined distance from the contact wall 24a.
[0039]
Next, by attaching the swivel member 40 to the tapered holder 38 at the upper end of the spindle 36, the lower end of the swivel member 40 comes into contact with the head 35 a at the upper end of the operation shaft 35, and the operation shaft 35 is subjected to the urging force of the compression spring 48. By moving against it, it swings upward on the contact portion 32 a of the swing lever 32 and is released from the rotation restriction by the restriction pin 54.
[0040]
The swing lever 32 in the horizontal state is positioned and held by releasing the rotational regulation of the swing lever 32 and engaging the upper end of the contact portion 32a with the lower end of the positioning bolt 25a formed in the shape of a sword.
[0041]
As a result, the stepped hollow shaft 16 becomes rotatable, and the abutting portion 32a is brought into contact with the other abutting portion 24b via the swing lever 32 by rotating the turning member 40 with the operation handle 40a. The valve body 7 is driven by the hollow shaft 16 until it comes into contact (just 90 degrees), and the butterfly valve 6 rotates to the closed position shown in FIGS.
[0042]
The stepped hollow shaft 16 is in a state in which the rotation is restricted by contact with the contact portion 24b, but when the turning member 40 is further rotated, the step in which the rotation is restricted by the clutch member 30 acting. The clutch plate 42 integrated with the spindle 36 rotates relative to the pressing plate 45 b pressed and biased upward via the compression spring 52 with respect to the attached hollow shaft 16 via the plurality of hard balls 44.
[0043]
By rotating the spindle 36 in one direction, the upper and lower screw pieces 66a and 66b are moved in parallel in a direction away from each other, so that the four pivot pins 65 are moved outward in the radial direction. 62a, 62b, 62c, and 62d are moved in the diameter increasing direction by the four pivot pins 65.
[0044]
Therefore, the diameter of the annular water stop rubber G attached to the outer periphery of the expansion link 62 composed of the link pieces 62a, 62b, 62c, 62d is expanded, and the outer wall of the butterfly valve 6 is pressed by pressing the inner wall of the water main pipe 1. Is sealed.
[0045]
In this state, when the turning member 40 is pulled out from the tapered holder 38, the operation shaft 35 is moved upward by the action of the compression spring 48, and the abutting portion 32a of the swing lever 32 is lowered so that the other contact is made. The contact portion 32a that contacts the contact wall 24b is sandwiched between a contact pin 24b and a control pin (not shown) similar to the control pin 54 shown in FIG. Rotation around the valve shaft is restricted, and the closed state of the inner wall of the water main pipe 1 by the butterfly valve 6 is maintained.
[0046]
Next, when the closed state of the water main pipe 1 is released, an operation of rotating the butterfly valve 6 by 90 degrees in the opposite direction is performed. Therefore, when the butterfly valve 6 is inverted by 90 degrees, a mounting hole at the lower end of the turning member 40 is attached to the tapered holder 38, and the swing lever 32 is swung horizontally to be removed from the regulating pin, and the stepped hollow shaft 16 is brought into a rotatable state. However, since the load acts on the rotation of the stepped hollow shaft 16 by the pressing force to the inner wall of the water main pipe 1 by the water stop rubber G on the outer periphery of the butterfly valve 6, the clutch member 30 acts and only the spindle 36 is the first. It rotates in the opposite direction.
[0047]
By rotating the spindle 36 in the opposite direction, the upper and lower screw pieces 66a and 66b move in parallel in a direction in which they approach each other, so that the four pivot pins 65 move radially inward toward the center of the butterfly valve 6. The link pieces 62 a, 62 b, 62 c, 62 d divided into four parts are moved in the diameter reducing direction by the four pivot pins 65.
[0048]
When the pressing force to the inner wall of the water main pipe 1 gradually decreases due to the shrinkage of the water stop rubber G, the butterfly valve 6 can be rotated in the opposite direction, and the contact portion 32a of the swing lever 32 is in contact with one of the contacts. The stepped hollow shaft 16 is reversed until the butterfly valve 6 is opened until it abuts against the wall 24a. After the abutment, the clutch member 30 is actuated and only the spindle 36 is actuated to move the screw pieces 66a and 66b. After the divided link pieces 62a, 62b, 62c, and 62d have sufficiently reduced in diameter, the abutting portion 32a that has moved downward by pulling the pivoting member 40 out of the holder 38 is located between the regulating pin 54 and the abutting wall 24a. The butterfly valve 6 is kept open.
[0049]
Therefore, according to the water stop structure of the butterfly valve as in the above embodiment, the butterfly valve 6 includes the stepped hollow shaft 16 and the spindle 36 extending outward from the water main pipe 1, and the stepped hollow shaft 16. The butterfly valve body 7 attached to the tip of the screw 36, the screw pieces 66a and 66b that are screwed to the spindle 36 and move up and down in accordance with the rotation of the spindle 36, and the butterfly in accordance with the up and down movement of the screw pieces 66a and 66b. By comprising the expansion link 62 that presses or releases the water stop rubber G arranged in the circumferential direction of the valve body 7 on the inner surface of the water main pipe 1, damage at the time of mounting the butterfly valve body 7 can be prevented, Since the water stop rubber G can be pressed against the inner surface of the water main pipe 1 at the water stop position, a reliable water stop effect can be obtained.
[0050]
Furthermore, the screw pieces 66a and 66b are composed of a pair of screw pieces 66a and 66b that are close to or away from each other with respect to the rotation direction of the spindle 36, and the expansion link 62 is stopped by the separation of the pair of screw pieces 66a and 66b. The water rubber G is pressed against the inner surface of the water main pipe 1, and the pressure can be released by the proximity of the pair of screw pieces 66a, 66b, and the proximity or separation distance of the pair of screw pieces 66a, 66b is equal. Since it is comprised, it can implement | achieve equal pressing of the water stop rubber G.
[0051]
The expansion link 62 includes four link pieces 62a, 62b, 62c, and 62d that are equally arranged in the circumferential direction, and is supported so as to be movable in the radial direction with respect to the proximity and separation of the screw pieces 66a and 66b. Therefore, a more uniform pressing force can be applied to the water stop rubber G by the radial expansion action of the four link pieces 62a, 62b, 62c, 62d.
[0052]
Further, after the butterfly valve 6 is inserted through the elliptical butterfly valve insertion hole H, the rotation of the stepped hollow shaft 16 where the butterfly valve body 7 is in the water stop position up to 90 degrees is the rotation of the spindle 36. Since the rotation of the spindle 36 exceeding 90 degrees is converted into the movement of the screw pieces 66a and 66b, the rotation of the butterfly valve body 7 rotated 90 degrees is performed. Since the pressing action of the water stop rubber G is automatically started at the water stop position, the water stop work can be easily performed.
[0053]
Further, the spindle 36 and the stepped hollow shaft 16 are connected via the operation shaft 35, and when the turning member 40 is mounted on the spindle 36, the operation shaft 35 is operated and the stepped hollow shaft 16 is allowed to rotate. Since the stepped hollow shaft 16 cannot be rotated unless the swivel member 40 is mounted on the spindle 36, the butterfly valve 6 does not work carelessly.
[0054]
Further, the stepped hollow shaft 16 is 90 degrees by contact walls 24 a and 24 b provided on the butterfly valve support member 10 which is inserted and supported in a liquid-tight manner in the cylindrical body 8 protruding from the upper housing 5 of the water main pipe 1. Since the above rotation is prevented, the insertion position of the butterfly valve 6 and the positioning of the water stop position can be reliably set.
[0055]
Next, a description will be given with reference to FIG. 4 of a water stop rubber diameter increasing mechanism in a water stop structure of a butterfly valve according to another embodiment. FIG. 4 is a cross-sectional view of a butterfly valve according to another embodiment. Hereinafter, the same components as the components according to the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.
[0056]
The butterfly valve 86 according to the present embodiment includes a valve body having a pair of pivot shafts 94a and 94b, and an annular water blocking rubber G ′ mounted on the outer periphery of the valve body. The swing valve 86 is pivotally attached to the pair of pivot shafts 94a and 94b. A pair of movable semicircular arc-shaped expanding members 84a and 84b, a trapezoidal piece member 88 disposed at the lower ends of both the expanding members 84a and 84b, and a piece that is screwed into the piece member 88 And a screw shaft 90 that moves the member up and down.
[0057]
Therefore, in the state in which the butterfly valve 86 according to the present embodiment is inserted into the water main pipe 1 through the butterfly valve insertion hole H on the upper side wall of the water main pipe 1 and is rotated in the direction of closing the water main pipe 1. The screw shaft 90 is rotated by the rotation of the spindle 36 by the turning member 40, so that the trapezoidal piece member 88 is moved upward.
[0058]
By the upward movement of the piece member 88, both the tapered sliding surfaces 85a and 85b formed to expand below the enlarged members 84a and 84b are pressed by the wedge action, and the outer circumferences of the enlarged members 84a and 84b. Is pushed outward. Thereby, the water stop rubber G ′ presses the inner wall of the water main pipe 1 by the radial expansion action by the diameter expansion members 84 a and 84 b and seals the outer periphery of the butterfly valve 86.
[0059]
Next, a description will be given with reference to FIG. 5 of a water stop rubber expanding mechanism in a water stop structure of a butterfly valve according to another embodiment. FIG. 5 is a cross-sectional view of a butterfly valve according to another embodiment.
[0060]
The butterfly valve 96 according to the present embodiment is pivotally attached to a valve body having a pair of pivot shafts 100a and 100b, an annular water stop rubber G ″ mounted on the outer periphery of the valve body, and a pair of pivot shafts 100a and 100b. A pair of swingable semi-arc-shaped enlarged members 98a and 98b, a trapezoidal piece member 93 disposed at the upper ends of both the enlarged members 98a and 98b, and the piece member 93 are screwed together. And a screw shaft 90 that moves the piece member up and down.
[0061]
Accordingly, in the same manner as in the above embodiment, the butterfly valve 96 is inserted into the water main pipe 1 and rotated in a direction to close the water main pipe 1. As the shaft 90 rotates, the trapezoidal piece member 93 moves downward.
[0062]
By the downward movement of the piece member 88, both the tapered sliding surfaces 95a and 95b formed to expand above the diameter expanding members 98a and 98b are pressed by the wedge action, and the outer circumferences of the diameter expanding members 98a and 98b. Is pushed outward. Thereby, the water stop rubber G ″ presses the inner wall of the water main pipe 1 by the diameter-expanding action in the radial direction by the diameter-expanding members 98a, 98b, and seals the outer periphery of the tufly valve 96.
[0063]
Therefore, according to the other two embodiments configured as described above, the water stop rubber can be reliably operated by the swing motion of the swing body.
[0064]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0065]
(A) According to the invention described in claim 1, since the butterfly valve can be inserted from the insertion hole by releasing the pressure against the water stop rubber, the valve body can be prevented from being damaged. Since it can be pressed against the inner surface, a reliable water stop effect can be obtained.
[0066]
(B) According to the invention described in claim 2, the water stop rubber can be reliably operated by a simple mechanism of the swing motion of the swing body.
[0067]
(C) According to the invention described in claim 3, since the proximity or separation distance of the pair of screw pieces is equal, it is possible to realize uniform pressing of the water-stopping rubber.
[0068]
(D) According to the invention described in claim 4, a more uniform pressing force can be applied to the water stop rubber by the expansion action of the four links in the radial direction.
[0069]
(E) According to the invention described in claim 5, since the pressing action of the water stop rubber is automatically started at the water stop position of the valve body rotated 90 degrees, the water stop work can be easily performed.
[0070]
(F) According to the invention described in claim 6, since the valve operating rod cannot be rotated unless the swivel member is mounted on the spindle, the water stop valve does not work unnecessarily.
[0071]
(G) According to the invention described in claim 7, since the butterfly valve can only be rotated up to a range of 90 degrees which is the water stop position with respect to the fluid pipe axis direction, the insertion position and the water stop position are reliably positioned. Can be set.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where an existing fluid pipe is stopped by a water stop structure in a closed state of a butterfly valve according to the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
3A is a cross-sectional view showing an opening / closing operation mechanism of a butterfly valve, and FIG. 3B is a plan view of FIG.
FIG. 4 is a cross-sectional view of a butterfly valve according to another embodiment.
FIG. 5 is a cross-sectional view of a butterfly valve according to another embodiment.
[Explanation of symbols]
1 Water main (fluid pipe)
2 Sealed housing
4 Lower housing
5 Upper housing
6 Butterfly valve
7 Valve body
8 cylinder
8a flange
8b Large diameter stepped cylinder
10 Butterfly valve support member
12 Flange
14 Butterfly valve operation device
15 Sealing device
16 Stepped hollow shaft (valve operating rod)
18 Retainer
20 Butterfly valve rotation restricting member
21 side wall
22 Top plate
24a, 24b Abutment wall
25a bolt
30 Clutch member
32 Swing lever
32a Contact part
32b Projection
34a, 34b pivot shaft
35 Operation shaft (lock pin)
35a head
36 spindle
36a Spindle bottom
37 Hinge Pin
38 Tapered holder
40 Rotating member
40a Operation handle
42 Clutch plate
44 hard balls
45a backing plate
45b Press plate
46 Protrusion
50 Support ring
54 Restriction pin
56a, 56b Screw shaft
58 Pressing body
60 Seal member
62 Extended links
62a, 62b Link piece
62c, 62d Link piece
64 arms
65 pivot pin
66a, 66b Upper and lower screw pieces
67 Slotted hole
68 Central connecting member
70a Upper connecting member
70b Lower connecting member
72 Radiation groove
74a, 74b Disc-shaped cover
76, 78 Guide bush
77 Support hole
82 Receiving member
84a, 84b Expanding member (expansion link)
85a, 85b Sliding surface
86, 96 Butterfly valve
88, 93 pieces
90 Screw shaft
94a, 94b Axis
95a, 95b Sliding surface
98a, 98b Expanding member (expansion link)
100a, 100b Axis
G, G ', G "
h Butterfly valve shaft support hole
H Butterfly valve insertion hole

Claims

A butterfly valve is inserted through an insertion hole drilled in the direction of the pipe axis of the fluid pipe, and the butterfly valve is rotated 90 degrees around a hollow shaft as a valve operating rod that is rotatably inserted in the pipe axis direction of the fluid pipe. A water stop structure of a butterfly valve that rotates to stop the flow of the fluid pipe, the butterfly valve being inserted through the hollow shaft and extending outward from the fluid pipe, and the valve operation A valve body attached to the tip of the rod, a screw piece screwed to the spindle that moves up and down according to the rotation of the spindle, and a water stop rubber arranged in the circumferential direction of the valve body according to the up and down movement of the screw piece A water stop structure for a butterfly valve comprising an expansion link that presses or releases the pressure on the inner surface of the fluid pipe.

The water stop structure for a butterfly valve according to claim 1, wherein the extension link is a pair of swinging bodies pivotally attached to a valve body.

The screw piece is composed of a pair of pieces that are close to or separated from each other with respect to the rotational direction of the spindle, and the expansion link presses the water stop rubber against the inner surface of the fluid pipe by the separation of the pair of screw pieces. The water stop structure for a butterfly valve according to claim 1, wherein the pressing can be released by the proximity of a screw piece.

4. The water stop structure for a butterfly valve according to claim 3, wherein the expansion link is composed of four links equally arranged in the circumferential direction, and is supported so as to be movable in the radial direction with respect to the proximity and separation of the screw pieces.

After the butterfly valve is inserted through the insertion hole, the valve operating rod whose valve body is in the water stop position is rotated up to 90 degrees by the rotation of the valve operating rod accompanying the rotation of the spindle. 5. The water stop structure for a butterfly valve according to claim 1, wherein the rotation exceeding the degree is converted into the movement of the screw piece.

6. The spindle according to claim 1, wherein the spindle and the valve operating rod are connected via a lock pin, and the rotation of the valve operating rod is allowed by operating the lock pin by mounting a turning member on the spindle. The water stop structure of the butterfly valve according to any one of the above.

The water stop structure for a butterfly valve according to any one of claims 1 to 6, wherein the valve operating rod is prevented from rotating by 90 degrees or more by a rotation restricting member provided on a valve support member attached to the fluid pipe. .