JP3833745B2

JP3833745B2 - Gas discharge preventer and operation shaft control member for the gas discharge preventer

Info

Publication number: JP3833745B2
Application number: JP19518996A
Authority: JP
Inventors: 満志水
Original assignee: 進興金属工業株式会社
Priority date: 1995-09-11
Filing date: 1996-07-08
Publication date: 2006-10-18
Anticipated expiration: 2016-07-08
Also published as: JPH09137871A

Description

【０００１】
【発明の属する技術分野】
本発明は、プロパンガス等のガスの配管系に接続して、緊急時にガスの放出を防止するガス放出防止器及びそれに用いられる作動軸制御部材に関する。
【０００２】
【従来の技術】
ガス放出防止器としては、図６に示すようなものが知られている。このガス放出防止器は、いわゆる張力式と呼ばれるもので、一端が流入口１０３で他端が流出口１０４となっているガス流路１０２が形成された本体部１００と、ガス流路１０２内に突出するように形成された弁座１０５と、スプリング１０６により弁座１０５方向に付勢されている弁体１０７と、先端に該弁体１０７を保持し、ガス流路１０２に沿って配設される弁棒１０８と、ガス流路１０２と略直交するように形成され、弁棒１０８の後部付近に開口する軸挿通孔１０９と、先端が略円錐状に形成され、該軸挿通孔１０９内を前後動可能に設けられていると共にスプリング１１１により上方に付勢されている作動軸１１０と、該作動軸１１０を常態において下降させ、作動軸１１０の周面により弁棒１０８の後部を押圧して弁体１０７を開弁状態で保持する作動軸制御部材１２０と、を有して構成されている。
【０００３】
そして、作動軸制御部材１２０に接続されている係留部材１３０に所定以上の引張力が生じると、作動軸制御部材１２０が外れ、作動軸１１０がスプリング１１１の弾発力により後退移動して弁棒１０８の後部を押圧している力が解除されるため、弁体１０７がスプリング１０６に付勢されて弁座１０５に圧接され、ガス流路１０２を閉塞し、ガスの流れが遮断されるものである。
【０００４】
上記したガス放出防止器の場合、作動軸制御部材１２０としては、図７に示すように、略環状で先端が開口している弾性湾曲部１２１ａを有し、側面から見たときに略Ｕ字状に曲成されている係合部材１２１と、該係合部材１２１において弾性湾曲部１２１ａに対面する接続部１２１ｂに固定される円盤部材１２２とを有して構成されている。そして、この作動軸制御部材１２０を装着する場合は、弾性湾曲部１２１ａ内に、作動軸１１０の突出端部を通過させ、該弾性湾曲部１２１ａを、軸挿通孔１０９が形成されている本体部１００の収容筒部１１２の上端部に形成されたテーパ部１１２ａに当接させる。この状態で、円盤部材１２２を収容筒部１１２に対してまっすぐ垂直に押圧する。その結果、弾性湾曲部１２１ａは収容筒部１１２のテーパ部１１２ａにより拡開し、該テーパ部１１２ａを通過すると再び弾性復帰力により縮小して、テーパ部１１２ａの下方に形成されている係合溝１１２ｂに係合する。これにより、円盤部材１２２の裏面１２２ａが作動軸１１０の突出端部を押圧することになり、作動軸１１０を押し下げ、弁体１０７を図６に示すように開弁状態で保持する。
【０００５】
【発明が解決しようとする課題】
従来のガス放出防止器の作動軸制御部材１２０はこのようにして取り付けるため、円盤部材１２２に対して本体部１００の収容筒部１１２の軸方向に沿ってまっすぐな押圧力を加えない場合には、弾性湾曲部１２１ａが傾斜し、収容筒部１１２の係合溝１１２ｂに弾性湾曲部１２１ａの一部しか係合しない場合がある。しかしながら、収容筒部１１２のテーパ部１１２ａに対してまっすぐ挿入するということは、そもそも挿入しにくいという問題がある。また、弾性湾曲部１２１ａの一部しか係合していないという状態が見過ごされた場合には、作動軸１１０の下降が中途半端になり、弁体１０７が僅かしか開弁していないことになり、ガスの供給量が少なくなるという問題が生じたり、係留部材１３０にきわめて僅かな振動が生じただけで弾性湾曲部１２１ａが係合溝１１２ｂから外れてしまうという問題が生じたりする場合がある。
【０００６】
また、上記した作動制御部材１２０は、側面略Ｕ字状に曲成されている係合部材１２１の弾性力により、円盤部材１２２を所定位置に保持して作動軸１１０の突出端部を押圧している。従って、長年使用している場合には、作動軸１１０を上方に付勢しているスプリング１１１の弾発力により、この略Ｕ字状の係合部材１２１が徐々に拡開し、すなわち、弾性湾曲部１２１ａと対面する円盤部材１２２との間隔が大きくなり、弁体１０７の開弁量が小さくなるという問題もある。
【０００７】
さらに、この種のガス放出防止器は、ガスボンベと共に屋外に設置されるのが通常である。このため、作動軸１１０の外周面と収容筒部１１２の内周面との僅かな隙間から塵や埃が入りやすい。長年使用することにより、上記したように略Ｕ字状の係合部材１２１が拡開してきた場合には、作動軸１１０の突出端部１１０ａが収容筒部１１２の外方へ少しずつ突出することになるため、余計、塵等が入りやすくなる。本体部１００の内部に塵等が侵入した場合には、当然、何らかの作動不良を生じることが懸念される。
【０００８】
本発明は上記課題を解消するためになされたものであり、容易かつ確実に装着することができると共に、長年使用により作動軸が自然に弁体を閉弁作動させる方向に移動することを従来よりも長期間にわたって防止でき、さらに、従来よりも本体部内に塵や埃の入りにくい構造の作動軸制御部材を備えたガス放出防止器及びガス放出防止器用作動軸制御部材を提供することを目的とする。
【０００９】
【課題を解決するための手段】
上記目的を達成するため本発明のガス放出防止器は、本体部の内部に形成されたガス流路内に配設され、該ガス流路を開閉する弁体と、本体部に突設された収容筒部内に収容され、該弁体の位置を制御する作動軸と、常態において弁体が開弁状態となるように作動軸を制御する作動軸制御部材と、一端が該作動軸制御部材に連結されると共に、他端が任意の不動部に連結され、所定以上の引張力が付与されると、作動軸制御部材における作動軸との接続が解除される係留部材と、を有するガス放出防止器において、前記作動軸制御部材が、板状部と該板状部の先端から突出している挟持部とを備え、係留部材に連結される係合体と、本体部の収容筒部の外周面に沿って摺動可能な内径で形成されていると共に、周壁に該係合体が密着して嵌合する開口部を備えた筒体とを有し、常態において、筒体の上壁部が収容筒部の外方に突出する作動軸の突出端部に接し、かつ、係合体が筒体の開口部に嵌合して、挟持部が前記本体部の収容筒部の所定位置に係合し、該弁体の開弁状態を保持することを特徴とする。
【００１０】
また、本発明のガス放出防止器は、作動軸が、収容筒部内で前進位置にあるときに弁体が開弁状態となり、後退位置にあるときに弁体が閉弁状態となるように設けられている態様、及び、収容筒部内で後退位置にあるときに弁体が開弁状態となり、前進位置にあるときに弁体が閉弁状態となるように設けられている態様のいずれの態様でも使用できる。
【００１１】
さらに、本発明のガス放出防止器用作動軸制御部材は、ガス放出防止器の本体部の内部に形成されたガス流路を開閉する弁体の位置を制御するために、本体部に突設された収容筒部内に収容された作動軸を、常態において弁体が開弁状態となるように制御すると共に、任意の不動部に連結された係留部材に連結されて配設されるガス放出防止器用作動軸制御部材であって、板状部と該板状部の先端から突出している挟持部とを備え、係留部材に連結される係合体と、ガス放出防止器の本体部の収容筒部の外周面に沿って摺動可能な内径で形成されていると共に、周壁に該係合体が密着して嵌合する開口部を備えた筒体とを有し、常態において、筒体の上壁部が収容筒部の外方に突出する作動軸の突出端部に接し、かつ、係合体が筒体の開口部に嵌合して、挟持部が前記本体部の収容筒部の所定位置に係合し、該弁体の開弁状態を保持することを特徴とする。
【００１２】
【発明の実施の形態】
本発明の実施の形態を図面に基づき説明する。図１〜図３は本発明の第１の実施の形態を示す。図において、１はガス放出防止器を示し、本体部２、弁体３、弁棒４、作動軸６、作動軸制御部材８等を有して構成される。
【００１３】
本体部２は、一端がガスボンベ等に接続されるガス流入口２１ａとして、他端がガス機器の配管系に接続されるガス流出口２１ｂとして機能し、ほぼ一直線状に形成されたガス流路２１を有している。また、本体部２のガス流路２１を形成する内壁部にはガス流路２１内に突出するように環状の突出壁部２１ｃが形成されており、この突出壁部２１ｃが弁体３と当接する弁座としての機能を果たす。本体部２の適宜位置、図面に示した例では略中央部よりややガス流出口２１ｂ寄りの位置には、ガス流路２１と略直交する方向に突出する作動軸６を収容するための収容筒部２２が突設されており、この収容筒部２２内には、一端がガス流路２１に開口する軸挿通孔２２ａが形成されている。なお、収容筒部２２の外周面の適宜位置には、後述の作動軸制御部材８の係合体８１が係合する係合溝２２ｂが刻設されている。
【００１４】
弁体３は略環状に形成され、ガス流入口２１ａと弁座として機能する突出壁部２１ｃとの間に位置するように、ガス流路２１に沿って配設される弁棒４の先端部に取り付けられている。また、該弁体３は、ガス流入口２１ａとの間に配設される第１のスプリング５により、弁座としての突出壁部２１ｃに圧接される方向に付勢されている。なお、弁棒４は、第１のスプリング５によって付勢されることにより、その後部４１が収容筒部２２の軸挿通孔２２ａの下方に位置する程度の長さを有しており、外周面には適宜形状のガス流通溝４２が設けられている。
【００１５】
作動軸６は、先端部６１が略円錐状に形成され、上記した収容筒部２２の軸挿通孔２２ａに挿通されて配設され、該先端部６１がガス流路２１内に臨み、後端部（突出端部）６２が収容筒部２２から突出するように配設される。具体的には、作動軸６の中途に設けたフランジ部６３に一端が当接し、収容筒部２２の内壁部に他端が当接するように配設されている第２のスプリング７によって付勢され、該突出端部６２が収容筒部２２から突出するように配設される（図２参照）。また、この作動軸６は、下降（前進）した状態では、該作動軸６の外周面が弁棒４の後部４１を押圧してガス流入口２１ａ方向に移動させて弁体３を開弁状態とし、上昇（後退）した状態では、該作動軸６により弁棒４１に対する押圧力が解除されて第１のスプリング５の弾発力により、弁体３が弁座として機能する突出壁部２１ｃに押し付けられ、閉弁状態とするものである。なお、符号６４は封止用パッキンである。
【００１６】
作動軸制御部材８は、係合体８１と筒体８２とから構成される。図３に示すように、係合体８１は、鋼線を略Ｕ字状に屈曲すると共に、開口している側の端部付近を湾曲させて略環状に形成した挟持部８１ａと、該挟持部８１ａの開口している側の端部付近を残し、該鋼線のその他の部分を被包する所定の厚みの板状部８１ｂとを有して構成されている。板状部８１ｂは、より詳しくは、挟持部８１ａ側から鋼線の屈曲部８１ｃ方向に向かった所定の位置まで、筒体８２に形成された開口部８２ａに密着して嵌合するため、該開口部８２ａの上下及び左右の開口間隔とほぼ同じ厚み及び幅を有する挿入部８１ｄと、該開口部８２ａへの挿入を阻止する、挿入部８１ｄよりも厚い厚み及び広い幅を有するストッパ部８１ｅとを有して構成される。なお、挟持部８１ａを有する鋼線と板状部８１ｂとはネジ等（図示せず）により連結固定される。
【００１７】
筒体８２は、上記した本体部２の収容筒部２２の外径とほぼ同じで、該収容筒部２２の外周面に沿って摺動可能な程度の内径を有すると共に、中空部の一端（上壁部８２ｃ）が閉塞され、さらに、周壁には上記した係合体８１の板状部８１ｂの挿入部８１ｄと密着嵌合する上下及び左右の開口間隔を有する開口部８２ａが形成されている。そして、筒体８２は、開口している下端部８２ｂを収容筒部２２の端部から外挿し、上壁部８２ｃが収容筒部２２から突出している作動軸６の突出端部６２に接するように配設される。この場合、図面に示すように、突出端部６２に段差をつけて小径部６２ｃを形成し、小径部６２ｃを筒体８２の上壁部８２ｃに嵌合し、上壁部８２ｃの内面が段差面に当接するように係合すると、係合部分からの塵や埃等の侵入をより防ぐことができる。なお、上記した筒体８２に形成されている開口部８２ａは、該筒体８２をこのようにして配設した際に、該開口部８２ａが収容筒部２２に形成されている係合溝２２ｂの位置よりも上方となるよう位置に形成される（図２参照）。
【００１８】
ここで、係留部材９は、鎖状のものであるが、その一端９１は、上記した作動軸制御部材８の係合体８１の適宜個所、図面に示した例では、略Ｕ字状に曲成した鋼線の屈曲部８１ｃに連結されている。
【００１９】
次に、上記構成のガス放出防止器１の作用を説明する。まず、作動軸制御部材８の筒体８２の上壁部８２ｃの外面を押圧し、筒体８の開口部８２ａが収容筒部２２の係合溝２２ｂが設けられている位置に対応するまで押し下げる。この状態を維持したまま、作動軸制御部材８の係合体８１を開口部８２ａから挿入する。係合体８１は、挟持部８１ａの開口している部分が、係合溝２２ｂに押しつけられることにより拡開し、さらに押しつけると該係合溝２２ｂを挟持するようにして係合する。このとき、板状部８１ｂもストッパ部８２ｅが開口部８２ａに当接するまでその挿入部８１ｄが該開口部８２ａ内に挿入される。その結果、開口部８２ａ内に板状部８１ｂの挿入部８１ｄが密着嵌合する（図１参照）。第２のスプリング７の弾発力による作動軸６の突出端部６２の突出方向への力は、板状部８１ｂの厚み方向に作用することになるが、開口部８２ａに密着しているため、板状部８１ｂが厚み方向に押しつぶされない限り、抑制することができる。従って、図６及び図７に示した従来の略Ｕ字状に形成した係合部材１２０がその弾性力だけでスプリング１１１の力を抑制している手段と比較すれば、明らかに長期にわたって第２のスプリング７の弾発力を抑制することができる。なお、板状部８１ｂはこのような機能を有するため、挿入部８１ｄの先端付近８１ｇ自体が挟持部８１ａと共に係合溝２２ｂ内に係合可能な程度の大きさで形成しておくことが好ましい。
【００２０】
このようにして係合体８１を筒体８２の開口部８２ａを介して収容筒部２２の係合溝２２ｂに取り付けると、作動軸６は前進（下降）した状態で保持され、その外周面が弁棒４の後部４１に当接し、その分、弁棒４は第１のスプリング５の弾発力に抗してガス流入口２１ａ方向に移動して弁体３を弁座として機能する突出壁部２１ｃから離間させ、開弁状態が保持される（図１参照）。
【００２１】
ここで、係合体８１を筒体８２に挿入する際は、板状部８１ｂが開口部８２ａ内に密着するような幅及び厚みで形成されているため、これらがガイドの役割を果たし、挟持部８１ａを収容筒部２２の係合溝２２ｂに押しつけて係合させる際に、上下及び左右にずれることがない。従って、不完全な装着を防ぐことができ、弁体３の開弁状態を確実に維持することができる。
【００２２】
また、作動軸６と収容筒部２２との僅かな隙間は、作動軸制御部材８の筒体８２の上壁部８２ｃにより閉塞されているため、該隙間から塵等が入り込むこともない。また、筒体８２の開口部８２ａと係合体８１の板状部８１ｂとは、密着嵌合しているため、両者間に塵等が入り込むような隙間は生じない。
【００２３】
なお、地震等により、建物の壁等に接続されている係留部材９の他端が揺動するなどして、該係留部材９に所定以上の引張力が付与された場合には、作動軸制御部材８における作動軸６との接続が解除される。すなわち、作動軸制御部材８の係合体８１の挟持部８１ａが収容筒部２２の係合溝２２ｂから外れ、その結果、作動軸６が第２のスプリング７の弾発力により上昇すると共に、作動軸６の外周面から弁棒４の後部４１が離間するため、弁体３が第１のスプリング５の弾発力により弁座として機能する突出壁部２１ｃに圧接され、ガス流路２１を閉塞し、ガスの流れが遮断される（図２参照）。
【００２４】
図４は、本発明の第２の実施の形態を示す。本実施の形態では、作動軸６’が、下降（前進）した状態で弁体３’を開弁状態とし、上昇（後退）した状態で、スプリング５’の弾発力により、弁体３’を閉弁状態とするものである点で上記した第１の実施の形態のものと同様であるが、次の点が異なる。すなわち、本実施の形態では、本体部２’内に形成されるガス流路２１’がガス流入口２１’ａからガス流出口２１’ｂまで一直線状ではなく、中途でクランク状に屈曲した屈曲部２１’ｃを有している。また、この屈曲部２１’ｃのうちガス流路２１’の水平部に対し略直交する方向に沿って位置する部分（垂直部）内には突出壁部２１’ｄが形成されている。弁体３’は、この屈曲部２１’ｃの垂直部内に配設され、下端には図４において上方向に付勢するスプリング５’が当接するように設けられ、上端には弁棒４’が取り付けられている。そして、屈曲部２１’ｃの垂直部に連通するように収容筒部２２’が設けられ、その内部に作動軸６’が配設されている。従って、作動軸６’は弁棒４’と一直線状に配設されており、その下端面が弁棒４’の上端面と接する程度の長さを有している。なお、作動軸制御部材８’は、上記した第１の実施の形態のものと同様の構造を有している。
【００２５】
本実施の形態においては、常態では、係合体８１’の挟持部８１’ａが収容筒部２２’の係合溝２２’ｂに係合して、筒体８２’が作動軸６’を押圧し、スプリング５’の弾発力に抗して弁体３’を押し下げ、開弁状態で保持している。一方、係留部材９’に所定以上の引張力が作用した場合には、作動軸制御部材８’の係合体８１’が外れ、スプリング５’の弾発力により、弁体３’が、弁座として機能する突出壁部２１’ｄに圧接され、ガス流路２１’が閉塞される。なお、上記説明では作動軸６’と弁棒４’として別体に成形したものを用いているが、一体の棒部材（図示せず）を用いることも可能である。
【００２６】
図５は、本発明の第３の実施の形態を示す。本実施の形態は、本体部２’’がガス流路２１’’内にクランク状の屈曲部２１’’ｃが形成されている点では上記第２の実施の形態と同様であるが、屈曲部２１’’ｃ内に形成された突出壁部２１’’ｄの上方に弁体３’’が配設され、スプリング５’’が該弁体３’’を常態において下方に付勢している点で異なる。すなわち、図５に示したものは、弁体３’’に取り付けられた弁棒の機能も有する作動軸６’’が、常態において後退（上昇）位置にあるときに弁体３’’を開弁状態とし、作動軸６’’が前進（下降）位置にあるときに弁体３’’を閉弁状態とするものである。そして、作動軸制御部材８’’の係合体８１’’は、常態において、作動軸６’’に直接係合し、該作動軸６’’を後退（上昇）位置で保持し、地震等により、係合体８１’’が作動軸６’’から外れた場合には、作動軸６’’が前進（下降）し、弁体３’’を突出壁部２１’’ｄに押し付け閉弁作動させる。
【００２７】
なお、本発明は、以上のことより、作動軸が前進位置のときに弁体が開弁作動し、後退位置のときに弁体が閉弁作動するタイプのほか、作動軸が後退位置のときに弁体が開弁作動し、前進位置のときに弁体が閉弁するタイプのガス放出防止器にも適用可能である。
【００２８】
【発明の効果】
本発明のガス放出防止器及びガス放出防止器用作動軸制御部材によれば、該作動軸制御部材を容易かつ確実に装着することができる。また、係合体の弾性力だけで作動軸の位置制御をする構造ではないので、作動軸が自然に弁体を閉弁作動させることを、従来のものよりも長期にわたって防止することができる。さらに、筒体により作動軸と収容筒部との隙間等を塞ぐ構造であるため、塵や埃が入りにくい。しかも、作動軸の動作方向やガス流路の形状等によって限定されるものではなく、従来公知の種々のタイプのガス放出防止器に適用可能である。
【図面の簡単な説明】
【図１】本発明にかかるガス放出防止器の第１の実施の形態であって、弁体が開弁状態にあるときを示す断面図である。
【図２】本発明にかかるガス放出防止器の第１の実施の形態であって、弁体が閉弁状態にあるときを示す断面図である。
【図３】上記実施の形態で使用した作動軸制御部材を示す斜視図である。
【図４】本発明にかかるガス放出防止器の第２の実施の形態であって、弁体が開弁状態にあるときを示す断面図である。
【図５】本発明にかかるガス放出防止器の第３の実施の形態であって、弁体が開弁状態にあるときを示す断面図である。
【図６】従来のガス放出防止器の一例を示す断面図である。
【図７】従来のガス放出防止器で使用されている作動軸制御部材を示す斜視図である。
【符号の説明】
１ガス放出防止器
２本体部
２２収容筒部
２２ｂ係合溝
３弁体
４弁棒
５第１のスプリング
６作動軸
７第２のスプリング
８作動軸制御部材
８１係合体
８１ａ挟持部
８１ｂ板状部
８２筒体
８２ａ開口部
９係留部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas discharge preventer that is connected to a piping system for a gas such as propane gas to prevent the release of gas in an emergency, and an operating shaft control member used therefor.
[0002]
[Prior art]
As a gas emission preventer, the one shown in FIG. 6 is known. This gas discharge preventer is a so-called tension type, and has a main body 100 in which a gas flow path 102 having one end serving as an inlet 103 and the other end serving as an outlet 104 is formed in the gas flow path 102. A valve seat 105 formed so as to protrude, a valve body 107 biased in the direction of the valve seat 105 by a spring 106, the valve body 107 held at the tip, and disposed along the gas flow path 102. And a shaft insertion hole 109 which is formed so as to be substantially orthogonal to the gas flow path 102 and which opens in the vicinity of the rear portion of the valve rod 108, and a tip is formed in a substantially conical shape. An operating shaft 110 which is provided so as to be movable back and forth and is urged upward by a spring 111, and the operating shaft 110 is lowered in a normal state, and the rear surface of the valve rod 108 is pressed by the peripheral surface of the operating shaft 110. Valve body 107 Has an actuating shaft control member 120 for holding in an open state, a is configured.
[0003]
When a predetermined tensile force or more is generated in the mooring member 130 connected to the operating shaft control member 120, the operating shaft control member 120 is detached, and the operating shaft 110 moves backward due to the elastic force of the spring 111, so that the valve rod Since the force pressing the rear portion of the valve 108 is released, the valve body 107 is urged by the spring 106 and pressed against the valve seat 105, closes the gas flow path 102, and shuts off the gas flow. is there.
[0004]
In the case of the gas discharge preventer described above, as the operation shaft control member 120, as shown in FIG. 7, the operation shaft control member 120 has an elastic curved portion 121a having a substantially annular shape with an open front end. The engagement member 121 is bent in a shape, and the disk member 122 is fixed to the connection portion 121b facing the elastic bending portion 121a in the engagement member 121. When the operating shaft control member 120 is mounted, the protruding end portion of the operating shaft 110 is passed through the elastic bending portion 121a, and the elastic bending portion 121a is passed through the main body portion in which the shaft insertion hole 109 is formed. It is made to contact | abut to the taper part 112a formed in the upper end part of 100 accommodating cylinder parts 112. FIG. In this state, the disk member 122 is pressed straight and perpendicularly against the accommodation tube portion 112. As a result, the elastic bending portion 121a is expanded by the taper portion 112a of the accommodating cylinder portion 112, and when it passes through the taper portion 112a, it is contracted again by the elastic restoring force, and the engagement groove formed below the taper portion 112a. 112b is engaged. Thereby, the back surface 122a of the disk member 122 presses the protruding end portion of the operating shaft 110, and the operating shaft 110 is pushed down to hold the valve element 107 in the valve-opened state as shown in FIG.
[0005]
[Problems to be solved by the invention]
Since the operation shaft control member 120 of the conventional gas discharge preventer is attached in this manner, when a straight pressing force is not applied to the disk member 122 along the axial direction of the housing cylinder portion 112 of the main body portion 100, In some cases, the elastic bending portion 121a is inclined and only a part of the elastic bending portion 121a is engaged with the engagement groove 112b of the housing cylinder portion 112. However, the straight insertion with respect to the tapered portion 112a of the housing cylinder portion 112 has a problem that it is difficult to insert in the first place. In addition, when it is overlooked that only a part of the elastic bending portion 121a is engaged, the lowering of the operating shaft 110 becomes halfway, and the valve body 107 is slightly opened. There may be a problem that the amount of gas supplied is reduced, or a problem that the elastic bending portion 121a is disengaged from the engaging groove 112b only when a very slight vibration is generated in the anchoring member 130.
[0006]
Further, the above-described operation control member 120 holds the disk member 122 in a predetermined position and presses the protruding end portion of the operation shaft 110 by the elastic force of the engaging member 121 bent in a substantially U-shape on the side surface. ing. Therefore, when used for many years, the substantially U-shaped engagement member 121 is gradually expanded by the elastic force of the spring 111 urging the operating shaft 110 upward, that is, elastically. There is also a problem that an interval between the curved portion 121a and the disk member 122 facing the curved portion 121a is increased, and a valve opening amount of the valve body 107 is decreased.
[0007]
Further, this type of gas emission preventer is usually installed outdoors together with a gas cylinder. For this reason, dust and dirt are likely to enter from a slight gap between the outer peripheral surface of the operating shaft 110 and the inner peripheral surface of the accommodating cylinder portion 112. When the substantially U-shaped engaging member 121 is expanded as described above by using for many years, the protruding end portion 110a of the operating shaft 110 protrudes little by little toward the outside of the accommodating cylinder portion 112. Therefore, it becomes easy to enter extraneous dust. When dust or the like enters the main body 100, there is a concern that some malfunction may occur.
[0008]
The present invention has been made in order to solve the above-mentioned problems, and can be easily and reliably mounted, and the operation shaft has been moved in the direction of naturally closing the valve body when used for many years. Further, it is intended to provide a gas discharge preventer and an operation shaft control member for a gas discharge preventer provided with an operation shaft control member having a structure in which dust and dust are less likely to enter the main body than in the past. To do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the gas discharge preventer of the present invention is disposed in a gas flow path formed inside the main body, and is provided with a valve body for opening and closing the gas flow path, and protruding from the main body. An operating shaft that is housed in the housing cylinder and controls the position of the valve body, an operating shaft control member that controls the operating shaft so that the valve body is normally open, and one end connected to the operating shaft control member And a mooring member having the other end connected to an arbitrary immovable portion and a connection with the operating shaft in the operating shaft control member being released when a tensile force greater than a predetermined value is applied. In the container, the operating shaft control member includes a plate-like portion and a sandwiching portion protruding from the tip of the plate-like portion, and an engagement body connected to the anchoring member and an outer peripheral surface of the housing cylinder portion of the main body portion It is formed with an inner diameter that can be slid along, and the engagement body is closely attached to the peripheral wall. In the normal state, the upper wall portion of the cylinder is in contact with the projecting end of the operating shaft that projects outward from the housing cylinder, and the engaging body is the opening of the cylinder. The holding part is engaged with a predetermined position of the housing cylinder part of the main body part, and the valve body is held open.
[0010]
In addition, the gas discharge preventer of the present invention is provided so that the valve body is opened when the operating shaft is in the forward position within the housing cylinder, and the valve body is closed when the operating shaft is in the retracted position. Any aspect of the present invention and the aspect in which the valve body is in the valve open state when in the retracted position within the housing cylinder and the valve body is in the valve closed state when in the forward position. But you can use it.
[0011]
Furthermore, the operating shaft control member for a gas discharge preventer according to the present invention is projected from the main body part in order to control the position of the valve body that opens and closes the gas flow path formed inside the main body part of the gas discharge preventer. For the gas discharge preventer, which controls the operating shaft accommodated in the accommodating cylinder part so that the valve element is normally opened and is connected to a mooring member connected to an arbitrary stationary part. An operating shaft control member comprising a plate-like portion and a sandwiching portion protruding from the tip of the plate-like portion, an engagement body connected to the anchoring member, and a housing cylinder portion of the main body portion of the gas emission preventer A cylindrical body that has an inner diameter that is slidable along the outer peripheral surface, and that has an opening for closely fitting the engaging body to the peripheral wall. Is in contact with the projecting end of the actuating shaft projecting outward from the housing cylinder, and the engaging body is the opening of the cylinder Fitted, clamping portion engages at a predetermined position of the housing tube portion of the main body portion, characterized in that to hold the open state of the valve body.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a gas discharge preventer, which is configured to have a main body 2, a valve body 3, a valve rod 4, an operating shaft 6, an operating shaft control member 8, and the like.
[0013]
The main body 2 functions as a gas inflow port 21a whose one end is connected to a gas cylinder or the like, and the other end functions as a gas outflow port 21b connected to a piping system of a gas device. have. Further, an annular projecting wall portion 21 c is formed on the inner wall portion forming the gas flow path 21 of the main body 2 so as to project into the gas flow path 21, and this projecting wall portion 21 c is in contact with the valve body 3. It serves as a valve seat that comes into contact. An accommodating cylinder for accommodating an operating shaft 6 protruding in a direction substantially perpendicular to the gas flow path 21 at an appropriate position of the main body 2, in the example shown in the drawing, at a position slightly closer to the gas outlet 21 b than the substantially central portion. A portion 22 is protruded, and a shaft insertion hole 22 a having one end opened to the gas flow path 21 is formed in the accommodation tube portion 22. Note that an engagement groove 22b is formed at an appropriate position on the outer peripheral surface of the housing cylinder portion 22 so as to engage an engagement body 81 of an operation shaft control member 8 described later.
[0014]
The valve body 3 is formed in a substantially annular shape, and the distal end portion of the valve stem 4 disposed along the gas flow path 21 so as to be positioned between the gas inlet 21a and the protruding wall portion 21c functioning as a valve seat. Is attached. The valve body 3 is urged by a first spring 5 disposed between the valve body 3 and the gas inlet 21a in a direction in which the valve body 3 is pressed against a protruding wall portion 21c serving as a valve seat. The valve stem 4 is biased by the first spring 5 so that the rear portion 41 has a length such that the rear portion 41 is positioned below the shaft insertion hole 22a of the accommodating cylinder portion 22. Is provided with a gas flow groove 42 of an appropriate shape.
[0015]
The operating shaft 6 has a front end portion 61 formed in a substantially conical shape, and is inserted through the shaft insertion hole 22a of the housing cylinder portion 22 described above. The front end portion 61 faces the gas flow path 21, and the rear end A portion (protruding end portion) 62 is disposed so as to protrude from the accommodating cylinder portion 22. Specifically, one end abuts against a flange portion 63 provided in the middle of the operating shaft 6 and is urged by a second spring 7 disposed so that the other end abuts against the inner wall portion of the housing cylinder portion 22. Then, the protruding end portion 62 is disposed so as to protrude from the accommodating tube portion 22 (see FIG. 2). Further, in a state where the operating shaft 6 is lowered (advanced), the outer peripheral surface of the operating shaft 6 presses the rear portion 41 of the valve rod 4 and moves in the direction of the gas inlet 21a to open the valve body 3. In the raised (retracted) state, the pressing force against the valve rod 41 is released by the operating shaft 6 and the elastic force of the first spring 5 causes the valve body 3 to move to the protruding wall portion 21c that functions as a valve seat. The valve is pressed to close the valve. Reference numeral 64 denotes a sealing packing.
[0016]
The operating shaft control member 8 includes an engaging body 81 and a cylindrical body 82. As shown in FIG. 3, the engaging body 81 includes a sandwiching portion 81 a formed by bending a steel wire in a substantially U shape and curving the vicinity of the end portion on the opening side into a substantially annular shape, and the sandwiching portion. A plate-like portion 81b having a predetermined thickness is provided so as to leave the vicinity of the open end of 81a and enclose the other portion of the steel wire. More specifically, the plate-like portion 81b is closely fitted to the opening portion 82a formed in the cylindrical body 82 from the holding portion 81a side to a predetermined position facing the bent portion 81c direction of the steel wire. An insertion portion 81d having substantially the same thickness and width as the upper and lower and left and right opening intervals of the opening portion 82a, and a stopper portion 81e having a thickness and width wider than the insertion portion 81d, which prevents insertion into the opening portion 82a. It is comprised. The steel wire having the clamping part 81a and the plate-like part 81b are connected and fixed by screws or the like (not shown).
[0017]
The cylindrical body 82 is substantially the same as the outer diameter of the accommodating cylinder portion 22 of the main body 2 described above, has an inner diameter that is slidable along the outer peripheral surface of the accommodating cylinder portion 22, and one end of the hollow portion ( The upper wall portion 82c) is closed, and further, an opening portion 82a having upper and lower and left and right opening intervals is formed on the peripheral wall to closely fit with the insertion portion 81d of the plate-like portion 81b of the engaging body 81 described above. The cylindrical body 82 extrapolates the open lower end portion 82b from the end portion of the accommodating cylinder portion 22 so that the upper wall portion 82c contacts the protruding end portion 62 of the operating shaft 6 protruding from the accommodating cylinder portion 22. It is arranged. In this case, as shown in the drawing, the protruding end portion 62 is stepped to form a small diameter portion 62c, the small diameter portion 62c is fitted to the upper wall portion 82c of the cylindrical body 82, and the inner surface of the upper wall portion 82c is stepped. When engaged so as to come into contact with the surface, it is possible to further prevent intrusion of dust or the like from the engaging portion. It should be noted that the opening 82a formed in the cylindrical body 82 has an engaging groove 22b in which the opening 82a is formed in the accommodating cylindrical portion 22 when the cylindrical body 82 is arranged in this way. It is formed at a position above the position (see FIG. 2).
[0018]
Here, the mooring member 9 has a chain shape, but one end 91 thereof is bent at an appropriate portion of the engaging body 81 of the operation shaft control member 8 described above, in a substantially U shape in the example shown in the drawings. The steel wire is connected to the bent portion 81c.
[0019]
Next, the operation of the gas emission preventer 1 having the above configuration will be described. First, the outer surface of the upper wall portion 82c of the cylindrical body 82 of the operating shaft control member 8 is pressed and pushed down until the opening portion 82a of the cylindrical body 8 corresponds to the position where the engaging groove 22b of the accommodating cylindrical portion 22 is provided. . While maintaining this state, the engaging body 81 of the operating shaft control member 8 is inserted from the opening 82a. The engaging body 81 expands when the opening portion of the holding portion 81a is pressed against the engaging groove 22b, and when further pressed, the engaging body 81 is engaged so as to hold the engaging groove 22b. At this time, the insertion portion 81d of the plate-like portion 81b is inserted into the opening portion 82a until the stopper portion 82e contacts the opening portion 82a. As a result, the insertion portion 81d of the plate-like portion 81b is tightly fitted into the opening 82a (see FIG. 1). The force in the protruding direction of the protruding end 62 of the operating shaft 6 due to the elastic force of the second spring 7 acts in the thickness direction of the plate-like portion 81b, but is in close contact with the opening 82a. As long as the plate-like portion 81b is not crushed in the thickness direction, it can be suppressed. Therefore, when compared with the means in which the engagement member 120 formed in the conventional substantially U shape shown in FIG. 6 and FIG. The spring force of the spring 7 can be suppressed. Since the plate-like portion 81b has such a function, it is preferable that the vicinity of the distal end 81g itself of the insertion portion 81d is formed with a size that can be engaged with the holding portion 81a in the engagement groove 22b. .
[0020]
Thus, when the engaging body 81 is attached to the engaging groove 22b of the accommodating cylinder portion 22 through the opening 82a of the cylindrical body 82, the operating shaft 6 is held in the advanced (lowered) state, and its outer peripheral surface is the valve. The protruding wall portion that abuts against the rear portion 41 of the rod 4 and moves the valve rod 4 in the direction of the gas inlet 21a against the elastic force of the first spring 5 to function the valve body 3 as a valve seat. The valve is separated from 21c and the open state is maintained (see FIG. 1).
[0021]
Here, when the engaging body 81 is inserted into the cylindrical body 82, the plate-like portion 81b is formed with such a width and thickness that it is in close contact with the inside of the opening 82a. When 81a is pressed and engaged with the engaging groove 22b of the accommodation cylinder part 22, it does not shift up and down and right and left. Therefore, incomplete mounting can be prevented, and the valve opening state of the valve body 3 can be reliably maintained.
[0022]
Further, since a slight gap between the operating shaft 6 and the accommodating cylinder portion 22 is closed by the upper wall portion 82c of the cylinder 82 of the operating shaft control member 8, dust or the like does not enter from the gap. Moreover, since the opening part 82a of the cylindrical body 82 and the plate-like part 81b of the engaging body 81 are in close contact with each other, there is no gap in which dust or the like enters between them.
[0023]
In addition, when a tensile force greater than a predetermined value is applied to the mooring member 9 because the other end of the mooring member 9 connected to the wall of the building is swung due to an earthquake or the like, the operation axis control is performed. The connection between the member 8 and the operating shaft 6 is released. That is, the clamping portion 81a of the engaging body 81 of the operating shaft control member 8 is disengaged from the engaging groove 22b of the housing cylinder portion 22, and as a result, the operating shaft 6 is raised by the elastic force of the second spring 7, and the operation is performed. Since the rear portion 41 of the valve stem 4 is separated from the outer peripheral surface of the shaft 6, the valve body 3 is pressed against the projecting wall portion 21 c functioning as a valve seat by the elastic force of the first spring 5, thereby closing the gas flow path 21. Then, the gas flow is interrupted (see FIG. 2).
[0024]
FIG. 4 shows a second embodiment of the present invention. In the present embodiment, the valve body 3 ′ is opened when the operating shaft 6 ′ is lowered (advanced), and the valve body 3 ′ is lifted (retracted) by the elastic force of the spring 5 ′. Is the same as that of the first embodiment described above in that the valve is closed, but the following points are different. That is, in this embodiment, the gas flow path 21 ′ formed in the main body 2 ′ is not straight from the gas inlet 21′a to the gas outlet 21′b, but is bent in a crank shape in the middle. Part 21'c. Further, a protruding wall portion 21′d is formed in a portion (vertical portion) of the bent portion 21′c located along a direction substantially perpendicular to the horizontal portion of the gas flow path 21 ′. The valve body 3 ′ is disposed in a vertical portion of the bent portion 21′c, and is provided at its lower end so that a spring 5 ′ that urges upward in FIG. Is attached. An accommodation tube portion 22 ′ is provided so as to communicate with the vertical portion of the bent portion 21′c, and an operation shaft 6 ′ is disposed therein. Therefore, the operating shaft 6 ′ is arranged in a straight line with the valve stem 4 ′, and has a length such that its lower end surface is in contact with the upper end surface of the valve stem 4 ′. The operating shaft control member 8 ′ has the same structure as that of the first embodiment described above.
[0025]
In the present embodiment, in a normal state, the clamping portion 81′a of the engagement body 81 ′ is engaged with the engagement groove 22′b of the housing cylinder portion 22 ′, and the cylinder body 82 ′ presses the operating shaft 6 ′. The valve body 3 'is pushed down against the spring force of the spring 5' and held in the open state. On the other hand, when a predetermined tensile force or more is applied to the mooring member 9 ′, the engaging body 81 ′ of the operating shaft control member 8 ′ is disengaged, and the valve body 3 ′ is moved to the valve seat by the elastic force of the spring 5 ′. As a result, the gas flow passage 21 'is closed. In the above description, the operating shaft 6 ′ and the valve rod 4 ′ are separately molded, but an integral rod member (not shown) may be used.
[0026]
FIG. 5 shows a third embodiment of the present invention. This embodiment is the same as the second embodiment in that the main body 2 '' is formed with a crank-like bent portion 21''c in the gas flow path 21 ''. The valve body 3 '' is disposed above the protruding wall portion 21''d formed in the portion 21''c, and the spring 5 '' normally biases the valve body 3 '' downward. Is different. That is, the one shown in FIG. 5 opens the valve body 3 ″ when the operating shaft 6 ″ that also functions as a valve stem attached to the valve body 3 ″ is in the retracted (upward) position. In the valve state, the valve body 3 ″ is closed when the operating shaft 6 ″ is in the forward (downward) position. Then, the engaging body 81 ″ of the operating shaft control member 8 ″ normally engages with the operating shaft 6 ″ in a normal state, holds the operating shaft 6 ″ in the retracted (upward) position, and causes an earthquake or the like. When the engaging body 81 ″ is disengaged from the operating shaft 6 ″, the operating shaft 6 ″ moves forward (lowers), and the valve body 3 ″ is pressed against the protruding wall portion 21 ″ d to close the valve. .
[0027]
From the above, the present invention is not limited to the type in which the valve body opens when the operating shaft is in the forward position, and the valve body closes when the operating shaft is in the retracted position. The present invention is also applicable to a type of gas discharge preventer in which the valve element is opened and the valve element closes in the forward position.
[0028]
【The invention's effect】
According to the gas discharge preventer and the operation shaft control member for the gas discharge preventer of the present invention, the operation shaft control member can be easily and reliably mounted. Further, since the position of the operating shaft is not controlled only by the elastic force of the engaging body, it is possible to prevent the operating shaft from closing the valve body naturally for a longer period than the conventional one. Furthermore, since the cylinder is configured to close the gap between the operating shaft and the accommodating cylinder, dust and dirt are difficult to enter. Moreover, the present invention is not limited by the operation direction of the operating shaft, the shape of the gas flow path, and the like, and can be applied to various types of conventionally known gas emission preventers.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a gas discharge preventer according to a first embodiment of the present invention when a valve body is in an open state.
FIG. 2 is a cross-sectional view showing the gas discharge preventer according to the first embodiment of the present invention when the valve body is in a closed state.
FIG. 3 is a perspective view showing an operating shaft control member used in the embodiment.
FIG. 4 is a cross-sectional view showing a gas discharge preventer according to a second embodiment of the present invention when a valve body is in a valve open state.
FIG. 5 is a cross-sectional view showing the third embodiment of the gas release preventer according to the present invention when the valve body is in the valve open state.
FIG. 6 is a cross-sectional view showing an example of a conventional gas emission preventer.
FIG. 7 is a perspective view showing an operating shaft control member used in a conventional gas emission preventer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gas discharge | release prevention device 2 Main-body part 22 Storage cylinder part 22b Engagement groove | channel 3 Valve body 4 Valve rod 5 1st spring 6 Actuation shaft 7 2nd spring 8 Actuation shaft control member 81 Engagement body 81a Nipping part 81b Plate-shaped part 82 cylindrical body 82a opening 9 mooring member

Claims

A valve body that is disposed in a gas flow path formed inside the main body, opens and closes the gas flow path, and is housed in a housing cylinder that protrudes from the main body, and controls the position of the valve body. An operating shaft, an operating shaft control member that controls the operating shaft so that the valve element is normally opened, one end connected to the operating shaft control member, and the other end connected to an arbitrary stationary part. And a mooring member that is disconnected from the operating shaft of the operating shaft control member when a tensile force of a predetermined level or more is applied, wherein the operating shaft control member includes the plate-shaped portion and the plate-shaped portion. An engaging body connected to the anchoring member, an inner diameter that is slidable along the outer peripheral surface of the housing cylinder portion of the main body portion, and a peripheral wall. A cylinder having an opening into which the engagement body is closely attached and fitted, and in a normal state, the cylinder The upper wall portion is in contact with the projecting end of the operating shaft projecting outwardly of the housing cylinder portion, and the engaging body is fitted into the opening of the cylindrical body, sandwiching portion of the accommodating cylindrical portion of the body portion A gas discharge preventer which is engaged with a predetermined position and maintains the valve open state of the valve body.

The gas discharge prevention according to claim 1, wherein the valve body is opened when the operating shaft is in the forward movement position within the accommodating cylinder, and the valve body is closed when the operation shaft is in the backward movement position. vessel.

The gas discharge prevention according to claim 1, wherein the valve body is opened when the operating shaft is in the retracted position in the accommodating cylinder, and the valve body is closed when the operating shaft is in the advanced position. vessel.

In order to control the position of the valve body that opens and closes the gas flow path formed inside the main body part of the gas emission preventer, the operating shaft housed in the housing cylinder part projecting from the main body part is provided with the valve in the normal state. An operating shaft control member for a gas release preventer that is arranged to be connected to a mooring member that is connected to an arbitrary immovable part while controlling the body to be in a valve open state. And an engagement body connected to the anchoring member, and an inner diameter that is slidable along the outer peripheral surface of the housing cylinder portion of the main body portion of the gas release preventer. And a cylindrical body provided with an opening into which the engaging body is closely fitted and fitted to the peripheral wall, and in a normal state, the protruding end of the operating shaft in which the upper wall part of the cylindrical body protrudes outward of the housing cylindrical part parts in contact, and the engaging body is fitted into the opening of the cylindrical body, a predetermined position of the housing cylindrical portion of the clamping portion is the main portion It engaged, gas emission preventing dexterity actuating shaft control member, characterized in that to hold the open state of the valve body.