JP2004052891A

JP2004052891A - Gas plug

Info

Publication number: JP2004052891A
Application number: JP2002210822A
Authority: JP
Inventors: Yoshio Fujii; 藤井　良雄; Isamu Shiga; 志賀　勇
Original assignee: Fujii Gokin Seisakusho Co Ltd
Current assignee: Fujii Gokin Seisakusho Co Ltd
Priority date: 2002-07-19
Filing date: 2002-07-19
Publication date: 2004-02-19
Anticipated expiration: 2022-07-19
Also published as: JP3600600B2

Abstract

<P>PROBLEM TO BE SOLVED: To change a gas plug to the gas plug with a flow passage shut-off device to shut-off a gas flow passage at abnormal overheating state only by changing a plug body regarding the gas plug where the plug body is rotatably stored in the gas plug body. <P>SOLUTION: The plug body consists of an outer plug (11) of a hollow body where an openings (11a), (11b) are formed, and an inner plug (12) which is rotatably housed in the outer plug and has an shut-off surface to shut-off the openings (11a), (11b). The plug body is equipped with an urging means (3), a holding member (4) and a stopper (33). The urging means (3) always urges the inner plug (12) in the passage shut-off direction of the plug body corresponding to the shut-off surface to the openings (11a), (11b). The holding member (4) can hold the inner plug (12) in a posture of rotating it in the passage communicating direction of the plug body not corresponding to the shut-off surface to the openings (11a), (11b) against the urging force. The stopper (33) stops rotating of the inner plug (12)on the point of time when the shut-off surface corresponds to the openings (11a), (11b) when the inner plug (12) is rotated by the urging force of the urging means (3). The holding member (4) consists of the thermally deformable material. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、ガス栓、特に、火災発生時において異常過熱状態となると、ガス栓本体内の栓体が自動的に回動してガスを遮断させる流路遮断装置を具備させたガス栓に関するものである。
【０００２】
【従来の技術】
緊急遮断装置を具備させたガス栓として、特開平６−９４１４９号に開示のものがある。
このものは、ガス栓本体に流路を開閉させる栓体が回動自在に収容させる栓収容部が設けられていると共に、前記栓収容部の上方開放部に前記栓体を回動操作させる操作つまみが連結された構成のガス栓の前記操作つまみ部分に、前記流路を自動的に遮断させる遮断装置を具備させる構成としたものであり、前記操作つまみに連結させる回動軸と、前記回動軸に外嵌させる回転胴と、前記回転胴の外周に配設され前記栓体を常時遮断方向に付勢させるバネと、前記バネの付勢力に抗して前記栓体を流路連通状態に保持する保持手段とから構成されている。
【０００３】
前記保持手段は、前記回転胴の外周面に形成された係止孔に嵌入されているボールと、前記ボールを前記係止孔に嵌入させる方向に押圧している押圧手段と、前記ボールと前記押圧手段との間に設けられた低融点合金ブロックとからなり、ガス栓の外部温度が所定温度以上になると、前記低融点合金ブロックが融解してボールが前記押圧手段側へ後退し、これによって、前記回転胴が前記バネの付勢力によって回動されて栓体が閉塞される構成となっている。
【０００４】
上記したような、流路遮断装置を具備させたガス栓では、例えば、火災の発生等により、ガス栓の外部温度が所定温度以上に過熱されると、栓体が自動的に閉塞方向に回動して、前記ガス栓の流路が閉塞される構成としたから、ガスをガス栓の上流側で遮断することができ、安全なガス栓を提供することができる。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記従来のものでは、栓体を自動的に回動させるために前記栓体の上部の操作つまみ部分に流路遮断装置を設ける構成としたから、前記操作つまみ部分を大きく構成しなければならなくなり、ガス栓全体が嵩高になるといった不都合がある。又、シール性を確保するために複雑な構造に構成されているから、既設のガス栓を流路遮断装置付きのガス栓に変更するためには、ガス栓本体全体を交換しなければならない。さらに、感熱部分が局部的に設けられていることから、外部の異常過熱が前記感熱部分である低融点ブロックに伝達されるのが遅く、迅速な対応が望めないといった問題もある。
【０００６】
本発明は、『ガス栓本体内に栓体が回動自在に収容されていると共に前記栓体を回動させることにより、前記ガス栓本体内のガス流路が開閉される形式のガス栓であって、異常過熱時にガス流路を遮断させる流路遮断装置を具備させたガス栓』において、前記流路遮断装置の構造を簡単にすると共に、既設のガス栓本体をそのまま利用できるようにすることを課題とする。
【０００７】
【課題を解決するための手段】
＊１項
上記課題を解決するための本発明の技術的手段は、『前記栓体は、対向する各位置に開口が形成された一端開放の中空体である外栓と、前記外栓内に回動自在に内蔵され前記開口を遮断可能な遮断面を具備する内栓とから構成され、
前記遮断面を前記開口に対応させる栓体内流路遮断方向に前記内栓を常時付勢させる付勢手段と、
前記付勢手段の付勢力に抗して前記遮断面を前記開口に対応させない栓体内流路連通方向に前記内栓を回動させた姿勢にて前記内栓を保持可能な保持部材と、前記内栓が前記付勢手段の付勢力によって回動させられ前記遮断面が前記開口に対応した時点で前記内栓の回動を停止させるストッパとが具備され、
前記保持部材の一部又は全部は熱変形可能な素材により構成されている』ことである。
【０００８】
上記技術的手段は次のように作用する。
ガス栓本体の流路を開閉するための栓体を外栓と内栓との二重構造とし、外栓内で内栓を回動させることにより、栓体自体の流路が開閉することとなる。すなわち、内栓に設けられている遮断面を外栓に形成した開口に一致するように対応させた状態が、栓体内の流路が遮断される栓体内流路遮断状態であり、前記遮断面を開口に対応させないように前記開口から前記遮断面をずらして位置させた状態が前記流路が連通する栓体内流路連通状態となる。尚、前記内栓は栓体内流路遮断状態となる方向に付勢された状態で前記保持部材により栓体内流路連通状態に保持される構成となっている。火災の発生等によりガス栓本体が高温に加熱された場合、前記保持部材は熱変形可能な素材より構成されていることから、保持部材は融解又は変形し、前記内栓を流路連通状態に保持している保持力が喪失される。保持力が喪失されると、付勢手段の付勢力によって内栓は栓体内流路遮断方向に回動させられるが、前記内栓はストッパによって必要以上に回動させられることがなく、確実に栓体内流路を遮断させた時点で回動が停止される。上記構成の栓体は、既設のガス栓のガス収容室に収容させることができ、これにより、通常のガス栓が、異常過熱時にガスをガス栓本体の上流側で遮断させることのできる緊急流路遮断装置付きのガス栓となる。
【０００９】
＊２項
１項において、『前記内栓は、前記開口に対応する連通孔が形成されている円筒栓である』ものでは、内栓を構成する側面において、前記連通孔が形成されていない部分が前記遮断面として機能することとなる。
【００１０】
＊３項
１項において、『前記内栓は、前記開口の一方を閉塞させる閉塞板を具備するように構成されている』ものでは、例えば、外栓内を回動自在な円板部の周縁に閉塞板を起立させた構成のものが採用可能である。この場合、閉塞板が前記遮断板として機能することとなり、前記閉塞板で前記一対の開口のうちの一つを遮断させた状態が前記栓体内流路遮断状態であり、前記閉塞板を外栓の構成壁のうち、前記開口が形成されていない部分に対応させた状態が前記栓体内流路連通状態となる。
【００１１】
＊４項
上記各項において、『前記保持部材は前記ガス栓本体の内壁に接するように設けられている』ものでは、ガス栓本体が高温に異常加熱された場合、保持部材に熱が速やかに伝導されることとなる。
上記各項において、保持部材としては、５項に示すように、『前記保持部材は熱可塑性合成樹脂、バイメタル、形状記憶合金、又は低融点金属から構成されている』ものが採用可能である。
【００１２】
＊６項
上記各項において、『前記付勢手段はねじりバネとし、
前記内栓の端面中央には回動軸を突出させているとともに前記端面周縁には凸部が突設されており、
前記外栓内に前記内栓を収容させた状態にて前記回動軸を約９０度回動させることにより、前記栓体内流路が開閉するように設定されていると共に、前記外栓の開放端は前記外栓に対して相対回動阻止状態に装着され且前記回動軸を貫通させる中央孔が形成された閉塞蓋によって閉塞される構成とし、
前記ねじりバネは前記回動軸に巻回させた態様で前記内栓の前記端面と前記閉塞蓋との間に収容されると共に、その一端は前記閉塞蓋に固定され、他端は前記凸部に係合させて前記内栓を前記栓体内流路遮断方向に付勢させ、
前記閉塞蓋には、前記ねじりバネの付勢力に抗して前記内栓を栓体内流路連通姿勢に保持させた状態にて前記凸部に回り止め状態に係止する係止軸が貫通状態に突出させるための貫通孔が形成されていると共に、前記貫通孔から前記付勢力の付勢方向に約９０度の間隔をおいて、前記ストッパとしての係合突部が突設されているものとし、
前記係止軸は、前記閉塞蓋の外面側に添設させる前記支持体によって支持されていると共に、前記支持体は熱変形可能な材質から構成されているものとし、
前記ガス栓本体に設ける栓収容室の底面に、前記支持体が接触する態様で前記栓体を前記栓収容室内に収容させるようにした』ものでは、外栓と内栓によって栓体が構成されると共に、前記外栓の開放部に付勢手段としてのねじりバネを具備させた後に、閉塞蓋を外栓に対して相対回動阻止状態に設ける。そして、前記閉塞蓋に添設するように前記内栓の保持手段としての係止軸を支持する支持体が設けられ、前記支持体が栓収容室の底部に接触するように、前記栓収容室に全体を収容させる。このものでは、前記支持体が異常過熱によって変形するように設定されており、前記支持体の変形によってこれに支持されていた係止軸の内栓を保持する保持力が喪失し、前記内栓はねじりバネの付勢力によって流路遮断方向に回動させられて栓体内の流路は自動的に遮断されることとなる。前記閉塞蓋には、前記係止軸を貫通させるための貫通孔と、これに周方向に９０度の間隔をおいて係止突起とが形成されているが、前記閉塞蓋は外栓に対して回り止め状態に装着されていることから、前記ねじりバネの付勢力が作用しても、前記閉塞蓋自体が回動することがなく、前記貫通孔及び係止突起の位置は変わることはない。
【００１３】
【発明の効果】
本発明は、上記構成であるから次の特有の効果を有する。
流路の開閉を栓体の内部だけで対応できるようにしたから、既設のガス栓の栓収容室内に収容されている栓体のみを交換することで、流路遮断装置付きのガス栓に変更することができる。よって、部品等に無駄がなく、安価に且つ容易に流路遮断装置付きのガス栓を提供することができる。又、ガス栓の外観が変わることないから、美観が損なわれることもない。
【００１４】
２項のものでは、内栓を円筒栓としたことから、中空筒体の外栓に挿入させ易く、又、安定した状態で回動させ易いといった効果がある。
【００１５】
３項のものでは、内栓を構成する材料が少なくてすむため、安価に仕上げることができるといった効果がある。
【００１６】
４項においては、外部の熱が保持部材に伝わり易く、遮断動作が迅速に行われるといった効果がある。
【００１７】
５項においては、保持部材の材料を特定することにより、異常過熱時の溶融又は変形を確実なものとすることができる。
【００１８】
６項のものでは、構造が簡単であるから、前記１項に記した効果と同様な効果がある上に、前記付勢手段として設けたねじりバネの付勢力によって、前記内栓を約９０度回動させて内栓が外栓の開口を確実に閉塞できるようにしたから、異常過熱時における栓体内流路を確実に遮断させることができる。
【００１９】
【発明の実施の形態】
次に、上記した本発明の実施の形態を図面に従って詳述する。
図１にから図５に示すものは、第１番目の実施の形態のガス栓に関するものであり、栓体が回動自在に収容されている栓収容室（２）と、前記栓収容室（２）の上流側に連通させたガス流入筒部（２１）と、前記栓収容室（２）の下流側に連通させたガス流出筒部（２２）とからガス栓本体（２０）が構成され、前記栓体に形成されている連通孔を介して前記ガス流入筒部（２１）から前記ガス流出筒部（２２）に至るガス流路（２３）が形成されると共に、前記栓体に回動阻止状態に接続させた操作ハンドル（１０）を操作して前記栓体を栓収容室（２）内で回動させることにより前記ガス流路（２３）が開閉される構成の一般的なガス栓を、流路遮断装置付きのガス栓に変更させるようにしたものである。
【００２０】
この実施の形態のガス栓に設けた栓体は、外栓（１１）と内栓（１２）とから二重構造に構成されているものとし、前記外栓（１１）は下方開放の中空筒体に形成されていると共にその構成壁の対向する位置には、それぞれ開口（１１ａ）（１１ｂ）が開放している。又、外栓（１１）の下方開放端における対向する位置には、一対の溝部（１３ａ）（１３ｂ）が下方開放状態に形成されている。又、前記下端近傍の内壁には、後述するＣ型リングを装着させるための受け溝（１４）が内方に開放するように形成されているものとする。
【００２１】
内栓（１２）は、連通孔（１５）を貫通させた円筒栓とし、前記外栓（１１）内に回動自在に収容可能な大きさに構成されている。内栓（１２）の下端面には、図１及び図２に示すように、その周縁に沿って略Ｃ字状の凸部（１６）が設けられており、前記凸部（１６）の一方の側端面（１６ａ）と他方の側端面（１６ｂ）とが成す角度は約９０度に設定されている。又、前記凸部（１６）の所定位置には、挿通孔（１７）が貫通していると共に、内栓（１２）の前記端面の中心からは回動軸（１８）が突出している。
【００２２】
前記回動軸（１８）には、ねじりバネ（３）の中心部分が巻回されており、前記ねじりバネ（３）の一端は前記挿通孔（１７）内に差し込まれると共に、他端は、図３に示すように、前記外栓（１１）の開放端を閉塞させる閉塞蓋（３０）に設けられた孔（３０ａ）に差し込まれて固定されている。
【００２３】
閉塞蓋（３０）は、図３に示すように、前記回動軸（１８）を貫通させる中心孔（３４）と、後述する係止軸（４）を貫通させる貫通孔（３２）とが貫通していると共に、前記貫通孔（３２）に対して周方向に略９０度離れた所定位置に、係合突起（３３）を上方へ突設させた構成の金属製の円板状である。又、前記閉塞蓋（３０）の周縁の対向する位置にはフランジ部（３１ａ）（３１ｂ）が外方へ突設されており、これらフランジ部（３１ａ）（３１ｂ）が前記溝部（１３ａ）（１３ｂ）にそれぞれ収容されることにより、前記閉塞蓋（３０）は、外栓（１１）に対して相対回動阻止状態に取り付けられることとなる。
【００２４】
前記係止軸（４）は、前記閉塞蓋（３０）の下方にさらに添設させる支持体（４０）によって垂直姿勢に起立された状態が維持されるように支持されるものとし、前記支持体（４０）の中心には、前記回動軸（１８）が差し込まれる凹部（４１）が形成されている。尚、前記支持体（４０）は、低融点金属等の一定温度以上に過熱されると融解又は変形する性質を有する素材から構成されているものとする。
【００２５】
この実施の形態のガス栓の栓体（１）を組み付けるには、まず、外栓（１１）内に内栓（１２）を下方開放部から挿入させ、開口（１１ａ）（１１ｂ）に連通孔（１５）を対応させた栓体内連通姿勢に設定する。この姿勢における内栓（１２）の下端面は、図２に示すように、凸部（１６）が一側方に開放する態様となっているものとする。この栓体内連通姿勢を維持したまま、閉塞蓋（３０）を装着させる。
【００２６】
閉塞蓋（３０）には、図３に示すように、ねじりバネ（３）が、一端が固定され且つ中心部分が中心孔（３４）に対応するように自然に開いた状態で載置されており、ねじりバネ（３）の前記中心部分と前記中心孔（３４）とに、前記回動軸（１８）が挿通されるようにして、閉塞蓋（３０）を外栓（１１）の下方開放端に装着させる。
【００２７】
このとき、ねじりバネ（３）の他端が、前記栓体内連通姿勢に設定された内栓（１２）における凸部（１６）の所定位置に貫通させた挿通孔（１７）に挿入されるように、ねじりバネ（３）を強制的に弾性変形させる。この状態で、前記フランジ部（３１ａ）（３１ｂ）を前記溝部（１３ａ）（１３ｂ）に嵌め込んでねじりバネ（３）を外栓（１１）に固定させる。
【００２８】
このとき、ねじりバネ（３）には、図２の二点鎖線に示す方向、すなわち、栓体内流路遮断方向の付勢力が働くこととなるが、前記付勢力によって内栓（１２）が外栓（１１）内で回動しないように、外栓（１１）の開口（１１ａ）（１１ｂ）側から内栓（１２）の姿勢を固定させておく。
【００２９】
この状態で、前記受け溝（１４）に、Ｃ型リング（１９）を嵌め込んで、前記閉塞蓋（３０）を抜け止め状態に固定させる。
又、装着された状態における閉塞蓋（３０）に設けた前記係合突起（３３）は、前記栓体内連通姿勢に維持された内栓（１２）の凸部（１６）の一方の側端面（１６ａ）に接すると共に、貫通孔（３２）は他方の側端面（１６ｂ）に接する位置に開放するように相互の位置関係は設定されているものとする。
【００３０】
そこで、前記貫通孔（３２）に、支持体（４０）に具備させた係止軸（４）を差し込むと共に、閉塞蓋（３０）の上方に突出させる。これにより、前記係止軸（４）に、他方の側端面（１６ｂ）が前記ねじりバネ（３）の付勢力によって押し付けられる態様となる。係止軸（４）は支持体（４０）によって垂直姿勢が維持されるように起立させられていると共に、係止軸（４）が貫通する閉塞蓋（３０）は外栓（１１）に対して回動阻止状態に取り付けられているから、係止軸（４）は、ねじりバネ（３）によって栓体内流路遮断方向に付勢された状態の内栓（１２）を回り止め状態に保持する保持手段として機能することとなる。
【００３１】
この組み付け状態で、支持体（４０）が栓収容室（２）の底面に接触するように、栓体（１）を栓収容室（２）内に収容させる。この状態においては、外栓（１１）と内栓（１２）とは栓体内流路連通状態で回り止め状態に保持された態様となっているから、外栓（１１）と内栓（１２）とで、通常のガス栓に設けられている栓体と同じように機能させることことができ、操作つまみ（１０）を操作して外栓（１１）を回動させることにより、内栓（１２）を内蔵させたままで栓体（１）が開閉操作されることとなる。
【００３２】
そして、火災の発生等によって、ガス栓本体（２０）が異常過熱された場合、ガス栓本体（２０）の熱は栓収容室（２）内の支持体（４０）に即座に伝達される。支持体（４０）は低融点金属から構成されているものであるから、異常過熱によって融解あるいは変形されてしまい、係止軸（４）を起立姿勢に支持できなくなる。その支持力が喪失されたとき、係止軸（４）は、閉塞蓋（３０）から抜け落ちてしまう。
【００３３】
ねじりバネ（３）の付勢力を阻止するものがなくなることにより、内栓（１２）はねじりバネ（３）の付勢力によって、図２の矢印の方向（栓体内流路遮断方向）に回動されることとなる。閉塞蓋（３０）には、前記係止軸（４）が突出していた位置から前記方向へ約９０度の間隔をおいた位置に、係合突起（３３）が突設された構成となっているから、図４に示すように、前記凸部（１６）の側端面（１６ｂ）が係合突起（３３）に当接した時点で、内栓（１２）の回動が停止する。すなわち、係合突起（３３）は内栓（１２）を約９０度回動させた時点で回り止め状態に保持するストッパとして機能することとなる。
【００３４】
この状態において、図５に示すように、連通孔（１５）が外栓（１１）の側壁によって閉塞された栓体内流路遮断状態となり、操作つまみ（１０）及び外栓（１１）の向きを変えることなく、内栓（１２）の向きのみが９０度変わることによって、ガス栓本体（２０）のガス流路（２３）は栓体（１）によって遮断されることとなる。
【００３５】
尚、上記した実施の形態の係止軸（４）は、異常過熱によっても変形せずに、閉塞蓋（３０）から落下することによって、保持力を失うように設定したが、係止軸（４）も前記支持体（４０）と同様に、低融点金属や、熱可塑性樹脂等の熱変形する素材から構成しても良い。この場合、異常過熱によって、係止軸（４）は支持体（４０）と共に変形又は融解することとなり、内栓（１２）を回り止め状態に保持する保持機能は喪失されるものとなる。
【００３６】
図６に示したものは、内栓（１２）の変形例の説明図である。
このものは、上記した実施の形態の内栓（１２）の連通孔（１５）を具備させた円板部（２４）に、前記外栓（１１）の開口（１１ａ）（１１ｂ）を閉塞可能な大きさの板状の閉塞板（２５）を設けた構成としている。
【００３７】
この内栓（１２）を外栓（１１）内で自動的に回動させるための構成は、上記第１番目の実施の形態のものと同様な構成が採用可能であり、常温時においては、前記閉塞板（２５）は、外栓（１１）の開口（１１ａ）（１１ｂ）から約９０度離れた位置の側壁に対応するようにねじりバネ等の保持手段によって保持されており、異常過熱状態になって、前記保持手段の保持力が喪失された時点で、内栓（１２）は、前記保持手段の付勢力によって、栓体内流路遮断方向に回動させられ、前記閉塞板（２５）が前記開口（１１ａ）（１１ｂ）に対応する、流路遮断状態となる。
【００３８】
上記各実施の形態のものは、従来の栓体を、外栓（１１）と内栓（１２）等からなる本発明の栓体（１）に交換するだけで、緊急ガス流路自動遮断装置を具備させたガス栓に変更することができるので、既設のガス栓本体をそのまま使用することができ、部品等に無駄を生じさせることがない。
【図面の簡単な説明】
【図１】本発明の第１番目の実施の形態のガス栓の常温時の状態を示す断面図。
【図２】本発明の第１番目の実施の形態のガス栓に採用した内栓の常温時の場合を示す底面図。
【図３】本発明の第１番目の実施の形態のガス栓に採用した閉塞蓋の平面図。
【図４】本発明の第１番目の実施の形態のガス栓に採用した内栓の異常過熱時の場合を示す底面図。
【図５】本発明の第１番目の実施の形態のガス栓が異常過熱によって閉栓された状態を示す断面図。
【図６】本発明の第２番目の実施の形態のガス栓に採用した内栓を示す斜視図。
【符号の説明】
（１）　・・・・・栓体
（１１）・・・・・外栓
（１１ａ）（１１ｂ）・・・開口
（１２）・・・・・内栓
（２０）・・・・・ガス栓本体
（２３）・・・・・ガス流路
（３）　・・・・・付勢手段（ねじりバネ）
（３３）・・・・・ストッパ（係合突起）
（４）　・・・・・保持手段（係止軸）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas plug, and more particularly, to a gas plug provided with a flow path cut-off device for automatically turning a plug in a gas plug main body and shutting off gas when an abnormally overheated state occurs in the event of a fire. It is.
[0002]
[Prior art]
As a gas stopper provided with an emergency shutoff device, there is one disclosed in Japanese Patent Application Laid-Open No. 6-94149.
In this apparatus, a plug housing portion for rotatably housing a plug body for opening and closing a flow path is provided in a gas stopper body, and an operation of rotating the plug body in an upper opening portion of the plug housing portion. The operation knob portion of the gas plug having a knob connected thereto is provided with a shutoff device for automatically shutting off the flow path, and a rotating shaft connected to the operation knob, A rotary body externally fitted to the driving shaft, a spring disposed on the outer circumference of the rotary body to constantly urge the plug in a blocking direction, and a flow path communicating state of the plug against the urging force of the spring; And holding means for holding the data.
[0003]
The holding means includes a ball fitted into a locking hole formed on an outer peripheral surface of the rotating body, a pressing means pressing the ball in a direction to fit the ball into the locking hole, And a low melting point alloy block provided between the pressing means, and when the external temperature of the gas stopper becomes equal to or higher than a predetermined temperature, the low melting point alloy block melts and the ball retreats to the pressing means side, whereby The rotary body is rotated by the biasing force of the spring to close the plug.
[0004]
In the gas plug provided with the flow path blocking device as described above, for example, when the external temperature of the gas plug is overheated to a predetermined temperature or more due to a fire or the like, the plug is automatically turned in the closing direction. By moving the gas plug, the flow path of the gas plug is closed, so that gas can be shut off upstream of the gas plug, and a safe gas plug can be provided.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional device, since the flow path cutoff device is provided at the operation knob portion on the upper portion of the plug to automatically rotate the plug, the operation knob must be configured to be large. And the entire gas stopper becomes bulky. Further, since the gas plug is configured to have a complicated structure in order to ensure the sealing property, the entire gas plug main body must be replaced in order to change the existing gas plug to a gas plug with a flow path cutoff device. Further, since the heat-sensitive portion is provided locally, there is a problem in that the external abnormal overheating is slowly transmitted to the low-melting point block, which is the heat-sensitive portion, and a rapid response cannot be expected.
[0006]
The present invention relates to a gas plug of a type in which a plug is rotatably housed in a gas plug main body and the gas flow path in the gas plug main body is opened and closed by rotating the plug. A gas plug provided with a flow path blocking device that blocks a gas flow path in the event of abnormal overheating ”, the structure of the flow path blocking device is simplified, and the existing gas plug body can be used as it is. That is the task.
[0007]
[Means for Solving the Problems]
* 1 The technical means of the present invention for solving the above-mentioned problem is as follows: "The plug is an outer plug which is a hollow body having an opening at each of opposing positions and open at one end; An inner stopper rotatably built-in and having a blocking surface capable of blocking the opening,
Biasing means for constantly biasing the inner plug in a plug body flow path blocking direction in which the blocking surface corresponds to the opening;
A holding member capable of holding the inner plug in a posture in which the inner plug is rotated in a direction in which the closing surface does not correspond to the opening in a direction in which a flow path communicates with the inside of the plug, against the urging force of the urging means; A stopper for stopping rotation of the inner plug when the inner plug is rotated by the urging force of the urging means and the blocking surface corresponds to the opening,
Part or all of the holding member is made of a thermally deformable material. "
[0008]
The above technical means works as follows.
The plug for opening and closing the flow path of the gas plug body has a double structure of an outer plug and an inner plug, and by rotating the inner plug in the outer plug, the flow path of the plug itself is opened and closed. Become. That is, a state in which the blocking surface provided in the inner plug is made to correspond to the opening formed in the outer plug is a plug flow passage blocking state in which the flow passage in the plug is blocked, and the blocking surface A state in which the blocking surface is shifted from the opening so as not to correspond to the opening is a passage communication state in the plug body in which the flow paths communicate. The inner plug is configured to be held by the holding member in a state of communicating with the flow path of the plug in a state where the inner plug is urged in a direction in which the flow path of the plug is blocked. When the gas stopper main body is heated to a high temperature due to the occurrence of a fire or the like, since the holding member is made of a thermally deformable material, the holding member is melted or deformed, and the inner plug is brought into a channel communication state. Holding power is lost. When the holding force is lost, the inner plug is turned in the closing direction of the flow path in the plug by the urging force of the urging means, but the inner plug is not turned more than necessary by the stopper, and The rotation is stopped when the plug body flow path is blocked. The plug having the above configuration can be accommodated in the gas accommodating chamber of the existing gas stopper, so that the normal gas stopper can shut off the gas upstream of the gas stopper main body in the event of abnormal overheating. It becomes a gas stopper with a road blocker.
[0009]
* 2 In item 1, in the item “the inner plug is a cylindrical plug having a communication hole corresponding to the opening”, a portion of the side surface forming the inner plug where the communication hole is not formed. Functions as the blocking surface.
[0010]
* 3 In the item 1, the "the inner plug is configured to have a closing plate for closing one of the openings", for example, a peripheral edge of a disk portion rotatable inside the outer plug. It is possible to adopt a configuration in which a closing plate is raised. In this case, the closing plate will function as the blocking plate, and a state in which one of the pair of openings is blocked by the closing plate is the flow path blocking state in the plug, and the closing plate is sealed with the outer plug. The state corresponding to the portion where the opening is not formed in the constituent wall of the above is the state of communication with the plug passage.
[0011]
* 4 In each of the above-mentioned items, in "the holding member is provided so as to be in contact with the inner wall of the gas plug main body", when the gas plug main body is abnormally heated to a high temperature, heat is quickly applied to the holding member. It will be conducted.
In each of the above items, as shown in item 5, as the holding member, it is possible to adopt "the holding member is made of a thermoplastic synthetic resin, a bimetal, a shape memory alloy, or a low-melting metal".
[0012]
* 6 In each of the above paragraphs, "The biasing means is a torsion spring,
A rotating shaft is protruded at the center of the end face of the inner plug, and a protruding portion is provided on the periphery of the end face,
By turning the rotating shaft about 90 degrees in a state where the inner plug is accommodated in the outer plug, the flow path in the plug is set to open and close, and the outer plug is opened. The end is attached to the outer plug in a state of preventing relative rotation and is closed by a closing lid having a central hole formed through the rotating shaft,
The torsion spring is housed between the end face of the inner plug and the closing lid in a mode wound around the rotating shaft, one end of the torsion spring is fixed to the closing lid, and the other end is the protrusion. , The inner plug is urged in the closing direction of the flow path in the plug body,
In the closing lid, a locking shaft that locks in a detent state with the convex portion in a state in which the inner plug is held in the flow passage posture in the plug body against the urging force of the torsion spring penetrates. A through hole for projecting from the through hole, and an engaging projection as the stopper protrudes from the through hole at an interval of about 90 degrees in a biasing direction of the biasing force. age,
The locking shaft is supported by the support attached to the outer surface side of the closing lid, and the support is made of a thermally deformable material,
The stopper is accommodated in the stopper accommodating chamber in such a manner that the support comes into contact with the bottom surface of the stopper accommodating chamber provided in the gas stopper main body. " After the torsion spring is provided at the opening of the outer plug as a biasing means, the closing lid is provided in a state of preventing relative rotation with respect to the outer plug. A support is provided to support a locking shaft as a holding means of the inner plug so as to be attached to the closing lid, and the plug accommodating chamber is arranged so that the support contacts the bottom of the plug accommodating chamber. To accommodate the whole. In this device, the support is set to be deformed due to abnormal overheating, and the deformation of the support loses the holding force for holding the inner plug of the locking shaft supported by the support, and the inner plug is deformed. The torsion spring is rotated in the flow path blocking direction by the urging force of the torsion spring, and the flow path in the plug is automatically blocked. The closing lid is formed with a through-hole for allowing the locking shaft to pass therethrough, and locking projections formed in the through-hole at intervals of 90 degrees in the circumferential direction. Even when the biasing force of the torsion spring is applied, the closing lid itself does not rotate, and the positions of the through hole and the locking projection do not change even when the biasing force of the torsion spring acts. .
[0013]
【The invention's effect】
The present invention has the following specific effects because of the above configuration.
Since the opening and closing of the flow path can be handled only by the inside of the plug, it is changed to a gas plug with a flow path cut-off device by replacing only the plug stored in the plug storage room of the existing gas plug can do. Therefore, it is possible to easily and inexpensively and easily provide a gas stopper with a flow path blocking device without wasting parts. Further, since the appearance of the gas stopper does not change, the appearance is not impaired.
[0014]
In the item (2), since the inner plug is a cylindrical plug, there is an effect that the inner plug is easily inserted into the outer plug of the hollow cylindrical body, and is easily rotated in a stable state.
[0015]
Item 3 has an effect that the material for forming the inner plug can be reduced, so that it can be finished at low cost.
[0016]
Item 4 has an effect that external heat is easily transmitted to the holding member, and the shutoff operation is performed quickly.
[0017]
In item 5, by specifying the material of the holding member, melting or deformation at the time of abnormal overheating can be ensured.
[0018]
In the case of item 6, since the structure is simple, the effect similar to the effect described in item 1 is obtained. In addition, the inner plug is rotated by about 90 degrees by the urging force of the torsion spring provided as the urging means. By rotating the inner plug, the inner plug can surely close the opening of the outer plug, so that the flow path in the plug during abnormal overheating can be reliably blocked.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the above-described embodiment of the present invention will be described in detail with reference to the drawings.
FIGS. 1 to 5 relate to the gas tap according to the first embodiment, in which a plug housing chamber (2) in which a plug body is rotatably housed and the plug housing chamber (2). A gas plug body (20) is composed of a gas inflow cylinder (21) connected to the upstream side of (2) and a gas outflow cylinder (22) connected to the downstream of the plug accommodating chamber (2). A gas flow path (23) from the gas inflow cylinder (21) to the gas outflow cylinder (22) is formed through a communication hole formed in the plug, and a gas passage is formed in the plug. A general gas having a configuration in which the gas flow path (23) is opened and closed by operating the operation handle (10) connected to the movement preventing state and rotating the stopper in the stopper accommodating chamber (2). The plug is changed to a gas plug with a flow path blocking device.
[0020]
The plug provided in the gas plug of this embodiment has a double structure including an outer plug (11) and an inner plug (12), and the outer plug (11) is a hollow cylinder which is open downward. Openings (11a) and (11b) are formed at positions facing the constituent walls formed on the body, respectively. Further, a pair of grooves (13a) (13b) is formed at the lower open end of the outer plug (11) at a position facing the lower open end. A receiving groove (14) for mounting a C-shaped ring described later is formed in the inner wall near the lower end so as to open inward.
[0021]
The inner plug (12) is a cylindrical plug that penetrates the communication hole (15), and is sized to be rotatably accommodated in the outer plug (11). As shown in FIGS. 1 and 2, a substantially C-shaped convex portion (16) is provided on the lower end surface of the inner plug (12), and one of the convex portions (16) is provided. The angle formed between the side end surface (16a) of the first side and the other side end surface (16b) is set to about 90 degrees. At a predetermined position of the convex portion (16), an insertion hole (17) penetrates, and a rotation shaft (18) protrudes from the center of the end face of the inner plug (12).
[0022]
A center portion of a torsion spring (3) is wound around the rotation shaft (18). One end of the torsion spring (3) is inserted into the insertion hole (17), and the other end is As shown in FIG. 3, it is inserted and fixed in a hole (30a) provided in a closing lid (30) for closing the open end of the outer plug (11).
[0023]
As shown in FIG. 3, the closing lid (30) has a center hole (34) penetrating the rotation shaft (18) and a through hole (32) penetrating a locking shaft (4) described later. It is a metal disk having a configuration in which an engagement protrusion (33) is projected upward at a predetermined position approximately 90 degrees in the circumferential direction with respect to the through hole (32). Further, flange portions (31a) and (31b) are protruded outward at positions facing the periphery of the closing lid (30), and these flange portions (31a) and (31b) are formed in the groove portions (13a) and (31b). 13b), the closing lid (30) is attached in a state of preventing relative rotation with respect to the outer plug (11).
[0024]
The locking shaft (4) is supported by a support (40) additionally attached below the closing lid (30) so as to be maintained in an upright state in a vertical posture. At the center of (40), a recess (41) into which the rotation shaft (18) is inserted is formed. The support (40) is made of a material having a property of melting or deforming when heated to a certain temperature or higher, such as a low melting point metal.
[0025]
In order to assemble the plug (1) of the gas plug of this embodiment, first, the inner plug (12) is inserted into the outer plug (11) from the lower opening, and the communication holes are formed in the openings (11a) and (11b). (15) is set to the corresponding communication posture in the plug. As shown in FIG. 2, the lower end surface of the inner plug (12) in this position is configured such that the convex portion (16) is opened to one side. The closing lid (30) is attached while maintaining the communicating posture of the plug.
[0026]
As shown in FIG. 3, a torsion spring (3) is placed on the closing lid (30) in a state where one end is fixed and the center portion is naturally opened so as to correspond to the center hole (34). The closing lid (30) is opened downward of the outer plug (11) so that the rotation shaft (18) is inserted into the center portion of the torsion spring (3) and the center hole (34). Attach to the edge.
[0027]
At this time, the other end of the torsion spring (3) is inserted into the insertion hole (17) penetrating a predetermined position of the projection (16) of the inner plug (12) set to the plug communication posture. Next, the torsion spring (3) is forcibly elastically deformed. In this state, the flanges (31a) and (31b) are fitted into the grooves (13a) and (13b) to fix the torsion spring (3) to the outer plug (11).
[0028]
At this time, the urging force in the direction shown by the two-dot chain line in FIG. 2, that is, in the direction of blocking the flow path in the plug, acts on the torsion spring (3). The posture of the inner plug (12) is fixed from the opening (11a) (11b) side of the outer plug (11) so as not to rotate in the plug (11).
[0029]
In this state, a C-shaped ring (19) is fitted into the receiving groove (14), and the closing lid (30) is fixed in a retaining state.
In addition, the engagement projection (33) provided on the closing lid (30) in the mounted state is provided on one side end face (1) of the projection (16) of the inner plug (12) maintained in the plug-in body communicating posture. 16a), and the mutual positional relationship is set so that the through hole (32) is opened to a position in contact with the other side end surface (16b).
[0030]
Then, the locking shaft (4) provided on the support (40) is inserted into the through hole (32), and is projected above the closing lid (30). Accordingly, the other side end surface (16b) is pressed against the locking shaft (4) by the urging force of the torsion spring (3). The locking shaft (4) is erected so that the vertical posture is maintained by the support (40), and the closing lid (30) through which the locking shaft (4) penetrates with respect to the outer plug (11). As a result, the locking shaft (4) holds the inner plug (12) in a state where it is urged by the torsion spring (3) in the closing direction of the flow path in the plug to prevent rotation. It will function as a holding unit that performs
[0031]
In this assembled state, the plug (1) is housed in the plug housing chamber (2) such that the support (40) contacts the bottom surface of the plug housing chamber (2). In this state, the outer plug (11) and the inner plug (12) are in a mode in which the outer plug (11) and the inner plug (12) are held in a non-rotating state while communicating with the flow path in the plug. By operating the operation knob (10) and rotating the outer plug (11), the inner plug (12) can be operated in the same manner as the plug provided in the ordinary gas plug. The plug (1) is opened / closed with ()) built-in.
[0032]
When the gas stopper main body (20) is abnormally overheated due to a fire or the like, the heat of the gas stopper main body (20) is immediately transmitted to the support (40) in the stopper housing (2). Since the support body (40) is made of a low melting point metal, it is melted or deformed due to abnormal overheating, and the locking shaft (4) cannot be supported in an upright posture. When the supporting force is lost, the locking shaft (4) falls out of the closing lid (30).
[0033]
Since there is no obstruction to the urging force of the torsion spring (3), the inner plug (12) is rotated in the direction of the arrow in FIG. Will be done. The closing lid (30) has a configuration in which an engagement projection (33) is protruded from the position where the locking shaft (4) protrudes at a position spaced by about 90 degrees in the direction. Therefore, as shown in FIG. 4, when the side end surface (16b) of the projection (16) comes into contact with the engagement projection (33), the rotation of the inner plug (12) stops. That is, the engagement protrusion (33) functions as a stopper that holds the inner plug (12) in a detented state when the inner plug (12) is rotated by about 90 degrees.
[0034]
In this state, as shown in FIG. 5, the communication hole (15) is in a state of blocking the flow path inside the plug, which is closed by the side wall of the outer plug (11), and the direction of the operation knob (10) and the outer plug (11) is changed. By changing only the direction of the inner plug (12) by 90 degrees without changing it, the gas flow path (23) of the gas plug main body (20) is blocked by the plug (1).
[0035]
The locking shaft (4) of the above-described embodiment is set so as not to be deformed by abnormal overheating and to lose its holding force by dropping from the closing lid (30). 4), like the support (40), may be made of a material that is thermally deformable, such as a low melting point metal or a thermoplastic resin. In this case, the locking shaft (4) is deformed or melted together with the support (40) due to abnormal overheating, and the holding function of holding the inner plug (12) in a detent state is lost.
[0036]
FIG. 6 is an explanatory view of a modification of the inner plug (12).
This can close the openings (11a) and (11b) of the outer plug (11) in the disk portion (24) provided with the communication hole (15) of the inner plug (12) of the above embodiment. A plate-like closing plate (25) of a suitable size is provided.
[0037]
As a configuration for automatically rotating the inner plug (12) in the outer plug (11), a configuration similar to that of the above-described first embodiment can be adopted. The closing plate (25) is held by a holding means such as a torsion spring so as to correspond to a side wall at a position about 90 degrees away from the openings (11a) and (11b) of the outer plug (11), and is in an abnormally overheated state. Then, when the holding force of the holding means is lost, the inner plug (12) is rotated in the closing direction of the flow path in the plug by the urging force of the holding means, and the closing plate (25) Are in a flow path blocking state corresponding to the openings (11a) and (11b).
[0038]
In each of the above embodiments, the emergency gas flow path automatic shut-off device can be achieved simply by replacing the conventional plug with the plug (1) of the present invention comprising the outer plug (11) and the inner plug (12). Can be changed to a gas plug provided with a gas plug, so that the existing gas plug main body can be used as it is, and no waste is caused on parts and the like.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a state of a gas stopper according to a first embodiment of the present invention at normal temperature.
FIG. 2 is a bottom view showing the case of the inner plug used at the ordinary temperature of the gas plug according to the first embodiment of the present invention.
FIG. 3 is a plan view of a closing lid employed in the gas stopper according to the first embodiment of the present invention.
FIG. 4 is a bottom view showing a case where the inner plug employed in the gas plug according to the first embodiment of the present invention is overheated abnormally.
FIG. 5 is a sectional view showing a state in which the gas plug according to the first embodiment of the present invention is closed due to abnormal overheating.
FIG. 6 is a perspective view showing an inner plug used in a gas plug according to a second embodiment of the present invention.
[Explanation of symbols]
(1) ·············································································. Main body (23) Gas flow path (3) Biasing means (torsion spring)
(33) ······ Stopper (engaging protrusion)
(4) ······· Holding means (locking shaft)

Claims

A gas stopper of a type in which a stopper is rotatably housed in a gas stopper body and a gas passage in the gas stopper body is opened and closed by rotating the stopper, and the overheating is abnormal. In a gas stopper equipped with a flow path blocking device that sometimes blocks the gas flow path,
The plug body includes an outer plug that is a hollow body having an opening at each of opposing positions and an opening at one end, and an inner plug that is rotatably built in the outer plug and that can shut off the opening. Is composed of
Biasing means for constantly biasing the inner plug in a plug body flow path blocking direction in which the blocking surface corresponds to the opening;
A holding member capable of holding the inner plug in a posture in which the inner plug is rotated in a direction in which the closing surface does not correspond to the opening in a direction in which a flow path communicates with the inside of the plug, against the urging force of the urging means; A stopper for stopping rotation of the inner plug when the inner plug is rotated by the urging force of the urging means and the blocking surface corresponds to the opening,
A gas stopper characterized in that part or all of the holding member is made of a thermally deformable material.

The gas stopper according to claim 1, wherein the inner stopper is a cylindrical stopper having a communication hole corresponding to the opening.

2. The gas stopper according to claim 1, wherein the inner stopper includes a closing plate that closes one of the openings.

4. The gas stopper according to claim 1, wherein the holding member is provided so as to be in contact with an inner wall of the gas stopper body.

The gas stopper according to any one of claims 1 to 4, wherein a part or all of the holding member is made of a thermoplastic synthetic resin, a bimetal, a shape memory alloy, or a low melting point metal.

The gas stopper according to any one of claims 1 to 5, wherein the biasing means is a torsion spring,
A rotating shaft is protruded at the center of the end face of the inner plug, and a protruding portion is provided on the periphery of the end face,
By turning the rotating shaft about 90 degrees in a state where the inner plug is accommodated in the outer plug, the flow path in the plug is set to open and close, and the outer plug is opened. The end is attached to the outer plug in a state of preventing relative rotation and is closed by a closing lid having a central hole formed through the rotating shaft,
The torsion spring is housed between the end face of the inner plug and the closing lid in a mode wound around the rotating shaft, one end of the torsion spring is fixed to the closing lid, and the other end is the protrusion. , The inner plug is urged in the closing direction of the flow path in the plug body,
In the closing lid, a locking shaft that locks in a detent state with the convex portion in a state in which the inner plug is held in the flow passage posture in the plug body against the urging force of the torsion spring penetrates. A through hole for projecting from the through hole, and an engaging projection as the stopper protrudes from the through hole at an interval of about 90 degrees in a biasing direction of the biasing force. age,
The locking shaft is supported by the support attached to the outer surface side of the closing lid, and the support is made of a thermally deformable material,
A gas stopper in which the stopper is accommodated in the stopper accommodating chamber such that the support comes into contact with the bottom surface of the stopper accommodating chamber provided in the gas stopper main body.