JP4547751B2 - Shut-off valve - Google Patents

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Publication number
JP4547751B2
JP4547751B2 JP37387399A JP37387399A JP4547751B2 JP 4547751 B2 JP4547751 B2 JP 4547751B2 JP 37387399 A JP37387399 A JP 37387399A JP 37387399 A JP37387399 A JP 37387399A JP 4547751 B2 JP4547751 B2 JP 4547751B2
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partition wall
mounting plate
lid
stator
valve
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JP37387399A
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JP2001187978A (en
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正樹 山口
行則 尾崎
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、ガス遮断装置の遮断機構として使用される遮断弁に関し、さらに詳しくは、流路に形成された弁座に対し弁体を前進または後退移動させることによって流路の遮断復帰動作を行うモータを動力源とした遮断弁に関するものである。
【0002】
【従来の技術】
ガス事故を未然に防ぐため、従来より種種の安全装置が利用されており、中でもガスメータに内蔵され流量センサによりガスの流量を監視しマイクロコンピュータによりガスの使用状態を異常使用と判断した場合や、地震センサ、ガス圧力センサ、ガス警報器、一酸化炭素センサなどのセンサの状況を監視し危険状態と判断した場合は、ガスメータに内蔵された遮断弁によりガスを遮断する電池電源によるマイクロコンピュータ搭載ガス遮断装置内蔵ガスメータ(以下マイコンメータと省略する)は、安全性、ガス配管の容易性、低価格等の優位性のため、普及が促進され、近年ほぼ全世帯普及が実施されるに至っている。また、流量センサによって計測されたガス流量情報を電話回線などを利用して集中監視するテレメータ機能を有した、集中監視型マイコンメータの比率も増加し、ますます、情報端末として利便性の向上が求められている。この集中監視型マイコンメータなどにおいては、簡単な電気スイッチ操作や電話回線などによる遠隔操作でガスの遮断、復帰が可能なよう、マイコンメータに搭載した電池による電気エネルギーでガス遮断もガス復帰も可能で開弁状態と閉弁状態の保持はエネルギーを必要としない遮断弁が要求されている。
【0003】
この遮断弁の駆動方式としては、従来電磁ソレノイドを使用したものが主流であったが、近年比較的強い閉止力、復帰力を実現でき、非通電時は状態保持可能なPM型ステッピングモータを駆動源とする遮断弁が注目されており、なかでもロータをガス流路内、ステータをガス流路外とする気密隔壁を持った遮断弁が、ガス流路への取り付けが容易なため主流である。
【0004】
以下に従来の遮断弁について説明する。
【0005】
従来のこの種の遮断弁は、特開平9−60752号公報、特開平11−2352号公報に示すようなものが一般的であった。この特開平11−2352号公報記載の遮断弁は図6に示されているように、鍔付きカップ状のケーシング6を有し、このケーシング6の外周にステータ4を装着し、前記ケーシングの開口部に合成樹脂製のアウターブッシュ3を嵌着し、このアウターブッシュ3にスタッド5を偏心させて前方に突設し、前記ケーシング6内にインナーブッシュ12を挿設し、前記アウターブッシュ3および前記インナーブッシュ12にリードスクリュー17をその先端の雄ネジ部17aが当該アウターブッシュ3より前方に突出した状態で正逆方向に回転自在に支持し、このリードスクリュー17にロータ16を前記ステータ4に対向する形で取り付け、このロータ16と前記アウターブッシュ3との間にスラスト荷重用ころがり軸受18を介挿し、前記スタッド5に係合し雄ネジ部17aに螺合して弁体25を配されている。弾性シール部材8とアウターブッシュ3とケーシング6は、段付きフランジ2と平板フランジ7とで挟み込まれていて、段付きフランジ2と平板フランジ7とはかしめによって固着されている。
【0006】
以上のように構成された遮断弁について、以下その動作について説明する。
【0007】
ガスの異常使用時などには、図示していない制御部からの通電により、ロータ16を正転させ、リードスクリュー17が正方向に回転し、弁体25がリードスクリュー17側から弁座26側に前進して弁座26に当接することにより、流体経路を閉塞して流体を遮断する。また、これを復元するときには、外部入力によってリードスクリュー17を逆方向に回転させ、弁体25を弁座26側からリードスクリュー17側に後退させ、流体経路を開放して流体の供給を再開していた。
【0008】
【発明が解決しようとする課題】
この種の遮断弁は、ガスメータに取り付けられた場合ケーシング8の外側が空気側になり、ガスメータが屋外に設置された場合、高い湿度やオゾン、温度変化などの過酷な環境にさらされることになる。そして、その中で、ガスメータの使用期間(一般に10年間)中特にメンテナンスしなくても、ガス漏れなどが発生しない高い信頼性が要求されている。
【0009】
上記の従来の遮断弁では、弾性シール部材8を段付きフランジ2と平板フランジ7とでスラスト方向に挟み込んでいて、弾性シール部材8の圧縮率は段付フランジ2の段深さに頼っているが、段付きフランジ2と平板フランジ7とが充分にかしめられていることが前提になっている。しかしながら、かしめ工法においては時にかしめ前の加圧が不充分で、かしめ部に隙間が生じることがあり、このとき従来の遮断弁のように弾性シール部材8がスラスト方向に圧縮されている場合は圧縮率が不充分になり、長期間の使用中に気密性が劣化してくることがあるという課題を有していた。
【0010】
また、かしめ部は母材が大きく変形されるため、かしめ時に表面処理膜が剥離したり、ひび割れている場合が多く、さらには、段付きフランジ2と平板フランジ7との接触部などは水分が残存しやすく、長期の使用中に段付きフランジ2と平板フランジ7とのかしめ部や接触部が腐食して、段付フランジ2から平板フランジ7が浮き上がり、弾性シール部材8の圧縮率が不充分になり、長期間の使用中に気密性が劣化してくることがあるという課題を有していた。
【0011】
また、弾性シール部材8と合成樹脂製のアウターブッシュ3とケーシング6とを、同時に段付きフランジ2と平板フランジ7とで挟み込んでいるため、温度変化によるアウターブッシュ3の膨張収縮で段付きフランジ2と平板フランジ7とのかしめが緩み弾性シール部材8の圧縮率が不充分になったり、アウターブッシュ3が径方向に膨張して弾性シール部材8を過圧縮状態にして圧縮永久ひずみを促進し、長期間の使用中に気密性が劣化してくることがあるという課題を有していた。
【0012】
本発明はかかる従来の課題に鑑み、長期の使用においてシール部材の圧縮率がほとんど変化せず、気密性に関して高い信頼性を持った遮断弁を提供することを目的とする。
【0013】
【課題を解決するための手段】
本発明は上記課題を解決するために、貫通穴のないなべ状に成形された剛体性の隔壁と、流体室に取り付け可能でこの隔壁の円筒部外径より若干大きな内径の円筒状段差部を形成された剛体性の取り付け板と、この隔壁の円筒部外周とこの取り付け板段差部内周との間に円周方向に圧縮して弾性体製のシール部材を配したものである。
【0014】
このため、シール部材の圧縮率は剛体製の隔壁の円筒部外径と剛体製の取り付け板の段差部内径で決定され、隔壁と取り付け板の軸方向の位置の微小な変動にはほとんど影響されない。そして、組立時にかしめ部の隙間発生などによる隔壁と取り付け板との若干の軸方向の位置ずれが発生した場合や、長期間使用している間に腐食や熱膨張などによって隔壁と取り付け板との固着のゆるみなどが発生した場合でも、シール部材の圧縮率はほとんど影響を受けず、気密性に関して高い信頼性を持った遮断弁を提供することができる。
【0015】
また、隔壁の開放端に中心に軸受を配された合成樹脂製のふたを嵌挿し、このふたの外周部を隔壁の開放端と取り付け板段差部の底面とで挟んで保持し、この隔壁を付勢手段で取り付け板の方向に付勢したものである。
【0016】
これによって、ふたと一体的に隔壁の開放端側の軸受を容易に配置できるとともに、温度変化によるふたの膨張収縮でシール部材の圧縮率が影響を受けず、かつ、隔壁は付勢手段で付勢されているので、温度変化によるふたの膨張収縮で隔壁と取り付け板との組付けがゆるまず、気密性に関してより高い信頼性を持った遮断弁を提供することができる。
【0017】
また、付勢手段は隔壁とステータの軸方向の相対位置を規制するよう形成され、前記ふたの挟持部に変形することによってふたの取り付け板に対する軸方向位置を変えることができる突起もしくは円周リブ状の寸法吸収部を形成したものである。
【0018】
これによって、隔壁とふたとステータと付勢手段の組み付けの際に、付勢手段で隔壁とステータの軸方向の相対位置が規制されて隔壁の円筒部外周でステータから突出する部分の長さが規制され、シール部材が軸方向に圧縮を受けることによって過圧縮状態になり気密性が劣化することを防止できる。また、組付け時に、ふたの挟持部の突起またはリブ状の寸法吸収部が、付勢手段の付勢力で選択的に変形し、ふたのほかの部分や隔壁に大きな応力をつたえないために、シール部材の入る部分の寸法を確保したまま、取り付け板と隔壁の開放端でふたを強固に挟持でき、ふた全体やふたに配された軸受、隔壁を変形させず、気密性と動作特性の信頼性を持った遮断弁を提供することができる。
【0019】
また、シール部材が取り付け板段差部から脱落することを防止するバックアップリングを、ステータとシール部材との間に配したものである。
【0020】
隔壁とステータとの組立品と取り付け板の組立の際に、通常、隔壁の円筒部外周にシール部材をはめた後、取り付け板の円筒段差部にシール部材を挿嵌する。
このとき、取り付け板の円筒段差部コーナーにシール部材が巻き込まれたり、前記コーナーのR部にシール部材が食い込んで気密性が低下する危険があるが、ステータの取り付け板側面にバックアップリングを形成することによって、取り付け板円筒段差部の前記コーナーのR部より深くシール部材を挿入することが可能で、かつ、はみ出し隙間も小さくすることができるため、組立時にシール部材が取り付け板の円筒段差部コーナーに巻き込みまれたり、前記コーナーRに食い込むことを防止でき、気密性に関してより高い信頼性を持った遮断弁を提供することができる。
【0021】
【発明の実施の形態】
本発明の遮断弁は、励磁コイルを有するステータと、前記ステータの内側に同軸に配設され貫通穴のないなべ状に成形された剛体性の隔壁と、流体室に取り付け可能で前記隔壁の円筒部外径より若干大きな内径の円筒状段差部を形成された剛体性の取り付け板と、前記隔壁の円筒部外周と前記取り付け板段差部内周との間に円周方向に圧縮されて配設された弾性体製のシール部材と、前記隔壁の内側に前記ステータに対向して配設されたロータと、前記ロータの回転軸に配設された弁機構とで構成され、前記隔壁は、開放端につばを有し、前記つばを前記シール部材と共に前記取り付け板段差部に挿入して構成されたものである。
【0022】
そして、シール部材の圧縮率は剛体製の隔壁の円筒部外径と剛体製の取り付け板の段差部内径で決定され、隔壁と取り付け板の軸方向の位置の微小な変動にはほとんど影響ず、組立時にかしめ部の隙間発生などによる隔壁と取り付け板との若干の軸方向の位置ずれが発生した場合や、長期間使用している間に腐食や熱膨張などによって隔壁と取り付け板との固着のゆるみなどが発生した場合でも、シール部材の圧縮率はほとんど影響を受けず、気密性に関して高い信頼性を持った遮断弁を提供することができる。
【0023】
また、本発明の遮断弁は、上記特徴に加え、隔壁を取り付け板方向に付勢する付勢手段と、前記隔壁の開放端に嵌挿され中心に軸受を配設した合成樹脂製のふたを有し、前記ふたの外周部を前記つば前記取り付け板段差部の底面とで挟んで保持したものである。
【0024】
そして、ふたと一体的に隔壁の開放端側の軸受を容易に配置できるとともに、温度変化によるふたの膨張収縮でシール部材の圧縮率が影響を受けず、かつ、隔壁は付勢手段で付勢されているので、温度変化によるふたの膨張収縮で隔壁と取り付け板との組付けがゆるまず、気密性に関してより高い信頼性を持った遮断弁を提供することができる。
【0025】
また、本発明の遮断弁は、上記ふたつの特徴に加え、付勢手段は隔壁とステータの軸方向の相対位置を規制するよう形成され、隔壁の開放端と取り付け板段差部底面と挟まれるふたの挟持部に、変形することによってふたの取り付け板に対する軸方向位置を変えることができる突起もしくは円周リブ状の寸法吸収部を形成されたものである。
【0026】
そして、隔壁とふたとステータと付勢手段の組み付けの際に、付勢手段で隔壁とステータの軸方向の相対位置が規制されて隔壁の円筒部外周でステータから突出する部分の長さが規制され、シール部材が軸方向に圧縮を受けることによって過圧縮状態になり気密性が劣化することを防止できる。また、組付け時に、ふたの挟持部の突起またはリブ状の寸法吸収部が、付勢手段の付勢力で選択的に変形し、ふたのほかの部分や隔壁に大きな応力をつたえないために、シール部材の入る部分の寸法を確保したまま、取り付け板と隔壁の開放端でふたを強固に挟持でき、ふた全体やふたに配された軸受、隔壁を変形させず、気密性と動作特性の信頼性を持った遮断弁を提供することができる。
【0027】
また、本発明の遮断弁は、上記特徴に加え、ステータとシール部材との間に配され、前記シール部材が取り付け板段差部から脱落することを防止するバックアップリングを有するものである。
【0028】
そして、隔壁とステータとの組立品と取り付け板の組立の際に、通常、隔壁の円筒部外周にシール部材をはめた後、取り付け板の円筒段差部にシール部材を挿嵌する。このとき、取り付け板の円筒段差部コーナーにシール部材が巻き込まれたり、前記コーナーのR部にシール部材が食い込んで気密性が低下する危険があるが、ステータの取り付け板側面にバックアップリングを形成することによって、取り付け板円筒段差部の前記コーナーのR部より深くシール部材を挿入することが可能で、かつ、はみ出し隙間も小さくすることができるため、組立時にシール部材が取り付け板の円筒段差部コーナーに巻き込みまれたり、前記コーナーRに食い込むことを防止でき、気密性に関してより高い信頼性を持った遮断弁を提供することができる。
【0029】
【実施例】
以下、本発明の実施例について図面を用いて説明する。
【0030】
(実施例1)
図1、図2、図3はそれぞれ本発明の実施例1の遮断弁の開弁状態、遮断動作中、閉弁状態の断面図である。
【0031】
図1において、概ね糸巻き状のコイルボビン41に導線42が巻線された励磁コイル43と、外周に円筒部を有し内周に櫛歯状の磁極を持った第1の電磁ヨーク44と、この電磁ヨーク44との間で励磁コイル43を挟持するように配された概ね円盤状で内周に櫛歯状の磁極を持った第2の電磁ヨーク45とのセットが2組、互いの第2の電磁ヨーク45の円盤部を接触させて配されステータ46を形成している。コイルボビン41は合成樹脂製でポリブチレンテレフタレート(PBT)のような耐熱性があり電気絶縁性の良好なものが望ましい。
【0032】
第1の電磁ヨーク44および第2の電磁ヨーク45は、低炭素鋼板、電磁軟鉄板または硅素鋼板製などの鋼板製で、表面に亜鉛メッキやアルミニウムメッキ、クロム酸処理膜等の防錆処理を施されているか、もしくは電磁ステンレス鋼板製で、経済的には亜鉛メッキ鋼鈑などのプリメッキ鋼鈑が望ましい。第1の電磁ヨーク44と第2の電磁ヨーク45の櫛歯状の磁極は所定の隙間を持って噛合し、また2組のセットの櫛歯は、回転方向に他のセットの櫛歯のほぼ隙間部に位置するよう配置されている。
【0033】
ステータ46の内側に同軸に、2段の底47a、47bと、大小の円筒部47c、47d、大径の円筒部47cの開放端につば47eを有するなべ状に絞り成形された嵌通孔のない金属性の隔壁47が配されている。隔壁47の材料は、非磁性ステンレス鋼鈑、銅合金、アルミニウム合金、合成樹脂、セラミックスなどの剛体が選択可能であるが、耐腐食性、強度、耐クリープ、薄肉加工性などの理由から、オーステナイト系ステンレス鋼鈑を絞り加工したものが最適であり、絞り加工後固溶化熱処理を施し、残留する内部応力と結晶粒の微細化を除去したものが望ましい。
【0034】
隔壁47の小径の円筒部47dなべ側面内側には、中心孔48aを有する合成樹脂製の第1の軸受48が嵌挿されている。隔壁47の円筒部47dと第1の軸受48は締まり嵌めで嵌合している。第1の軸受48の嵌挿部48bと中心孔48aとの間には、薄肉化した波紋状の応力緩和部48cが形成されている。
【0035】
また、隔壁47の底47aに当接するようストッパ48dが形成されている。
この第1の軸受48の材料は、ポリアセタール(POM)、ポリアミド(PA)およびポリテトラフルオロエチレン(PTFE)粉末や黒鉛粒子を配合された各種合成樹脂などの、自己潤滑性を有する合成樹脂が選択可能であるが、摩擦係数の低さや経済的理由からポリアセタールが最適である。このポリアセタールは応力クリープが比較的大きく軟質であるため、締まり嵌めの嵌め合いを設定する場合は、比較的大きな締め代を設定する必要があり、例えば隔壁47の円筒部47dの内径が8mmである場合は第1の軸受48の嵌挿部48bの外径は8.05〜8.1mm程度が適切である。
【0036】
隔壁47の大径の円筒部47cのなべ側面の開放端側には、第2の軸受け49a、側面に円筒部49b、外周につば部49cを同軸に有する合成樹脂製のふた49が、つば部49cを隔壁47のつば47eに当接して嵌挿されている。隔壁47の円筒部47cとふた49の嵌挿部49eは締まり嵌めで嵌合している。ふた49の嵌挿部49eと第2の軸受け49aとの間には、薄肉化した波紋状の応力緩和部49dが形成されている。
【0037】
このふた49の材料としては第1の軸受48同様ポリアセタールが最適である。隔壁47の円筒部47cとふた49の嵌挿部49eとの締まり嵌めの嵌め合いは、後述する別の固定手段があるため、また円盤部49fの波打ちを防止するために比較的ゆるめでよく、例えば隔壁47の円筒部47cの内径が18mmである場合はふた49の嵌挿部49eの外径は18.02〜18.08程度が適切である。ふた49の円筒部49bの内面には中心軸に平行な凸状のリブ50が、円周上で180°離れた2カ所に形成されている。
【0038】
隔壁47の内側には、円周方向に分極着磁された円筒形の永久磁石51と、一方の端に送りネジ52を形成された回転軸53と永久磁石51と回転軸53を同軸に保持するスリーブ54とで構成されたロータ55が、回転軸53の送りネジ52側端をふた49の第2の軸受け49aに、逆の端を第1の軸受48の中心孔48aに回転可能に緩挿されて配されている。
【0039】
流体室56に取り付け可能な取り付け板57は、中央に中心孔57aと隔壁47の大径の円筒部47cの外径より若干大きな内径を持った円筒状段差部57bを形成され、外周部の2カ所に爪状の嵌合部57cを形成されている。段差部57bには隔壁47の大径の円筒部47cの端部が挿入され、ふた49の円筒部49bが中心孔57aを貫通して流体室56側に突出し、円筒部47cの外周と段差部57bの内周との間には、合成ゴム製Oリングなどの弾性体シール部材58が隔壁47の中心軸に対して円周方向に圧縮されて配されている。ふた49のつば部49cは、取り付け板57の段差部57bの底面57dと隔壁47のつば47eとに挟まれて保持されている。
【0040】
取り付け板57の隔壁47側平面にはステータ46が当接して配されていて、このステータ46と隔壁47を押しつけて取り付け板57との間に挟み込んで、両端を取り付け板57の嵌合部57cに嵌合されて、概ねコの字形状の支持フレーム59(付勢手段)が配されている。支持フレーム59にはステータ46に係合可能な係合部59bが形成され、ステータ46の回転を防止している。
【0041】
なお、この例では係合部59bは背面から見ると凸字形状であり、先端部を電磁ヨーク44に開口した孔に差し込んで係合し、凸字の段差部で電磁ヨーク44を取り付け板57側へ付勢している。ステータ46とシール部材58との間には、シール部材58が取り付け板57の段差部57bから脱落することを防止するバックアップリング60が配されている。取り付け板57、支持フレーム59の材質は表面処理された鋼板、ステンレス鋼板、銅合金板、アルミニウム合金板など耐ガス性、耐腐食性と、強度を持った剛体材料であり、経済的理由から表面処理された鋼板が選択しやすい。
【0042】
流体室56内に配された移動体61は、中心孔61aが回転軸53の送りネジ54に螺合し、ステータ46側に概ね円盤状のバネ受け61bを形成され、他端に径の太い係合リング部61cを形成され、それらの間に径の細い円筒部61dを形成されている。バネ受け61bの外周には、ふた49のリブ50と係合可能な凹状部61e(図示せず)が、円周上で90°の間隔に4カ所に成形されている。この凹状部61eがリブ50と係合することで、移動体61と軸受49との回転が防止され、送りネジ54の回転動作が移動体61の前後動作に変換される。移動体61の材料は、ポリアセタール(POM)、ポリアミド(PA)およびポリテトラフルオロエチレン(PTFE)粉末や黒鉛粒子を配合された各種合成樹脂などの、自己潤滑性を有する合成樹脂が選択可能であるが、摩擦係数の低さや経済的理由からポリアセタールが最適である。
【0043】
弁体62は、流体室56内に形成された弁座65に当接可能な概ね円盤状で合成ゴムなどの可撓体性の弁シート63と、弁シート63のステータ46側面に当接して配された合成樹脂など剛体製の弁シート保持部材64とで構成されている。弁シート63は貫通孔がなく、外周に係合リング部63aを形成し、弁シート保持部材64を抱き込むようにして遊嵌している。
【0044】
弁シート保護部材64は、ステータ46側に突出し、内径が移動体61の係合リング部61cの外径とほぼ等しく軸方向に縦割り64aが形成された円筒部64bを有し、この円筒部64bの端に、内径が移動体61の係合リング部61c外径より細く移動体61の円筒部61d外径とほぼ等しい、内側に突出した係合爪64cを有し、移動体61と係合して配されている。弁シート保持部材64の円筒部64b先端と移動体61のバネ受け61bとの間には隙間69が設けられている。弁シート保持部材64の材料は、ポリアセタール(POM)、ポリアミド(PA)、ポリブチレンテレフタレート(PBT)といった、耐ガス性を有する合成樹脂材料が望ましい。
【0045】
移動体61と弁シート保持部材64との間には、弁シート保持部材64の円筒部64b外径とほぼ等しい内径を有するコイルスプリング66が圧縮して保持されている。
【0046】
そして、この移動体61と弁体62とで弁機構を構成している。
【0047】
ロータ55のスリーブ54と第1の軸受48、ふた49との間には、ポリテトラフルオロエチレン(PTFE)や黒鉛粒子を配合したポリアミド(PA)などの自己潤滑性を有する合成樹脂製のスラストワッシャ67、68が配されている。
【0048】
次にこの実施例1の遮断弁の動作、作用について説明する。
【0049】
ガスの使用状態が異常でなく、各種センサーからの信号が危険を示していない時、マイコンメータの制御部(ここまで図示せず)からの通電はなく、遮断弁は図1に示したように移動体61はステータ46側にあり、弁体62は弁座65から離れた開弁状態を保持し、ガスが流通可能である。
【0050】
ガスの使用状態が異常であるか、各種センサーからの信号が危険を示している時、マイコンメータの制御部は励磁コイル43の各導線42に位相差を持ったパルス状電流を印加し、ロータ55を正回転させる。移動体61は凹状部61eがリブ50と係合し回転を防止されているため、ロータ55に連動した送りネジ54の回転動作は移動体61の前後動作に変換され、移動体61と係合している弁体62は、弁シート63が弁座65に当接する位置に移動し、図2に示した状態になる。さらに移動体61が弁座65側に前進すると、コイルスプリング66がより圧縮され、弁シート保持部材64の円筒部64b先端と移動体61のバネ受け61bとが当接し、弁シート63が撓み、圧縮され、ついに移動体61の反発力が送りネジ54の推力より大きくなり、ロータ55の回転が停止する。こうして、弁体62は弁座65にコイルスプリング66で付勢され、ガスが遮断される。この閉弁状態の遮断弁を図3に示した。
【0051】
この後、マイコンメータの制御部が通電を停止しても、ロータ55は保持トルクのため状態を保持し、したがって弁体62は弁座65にコイルスプリング66で付勢された閉弁状態を保持する。
【0052】
各種センサーからの信号から危険が解除され復帰可能とマイコンメータの制御部が判断した場合や、ガス利用者が危険状態を復旧し、メータやリモートコントロール盤に設けられた復帰スイッチを操作した場合、ガス供給業者などが通信による遠隔復帰命令を発信した場合などには、マイコンメータの制御部は励磁コイル43の各導線42に逆位相差を持ったパルス状電流を印加し、ロータ55を逆回転させる。すると送りネジ54に送られて移動体61はステータ46側に移動し、弁体62は弁座65から離脱し、ガスが流通可能になる。移動体61はさらにステータ46側に移動し、ついに移動体61がふた49に当接し移動下死点となってロータ55の回転が停止する。この後マイコンメータの制御部が通電を停止しても、ロータ55は保持トルクのため状態を保持し、図1に示した開弁状態を保持する。
【0053】
さて、この種の遮断弁は、ガスメータに取り付けられた場合ケーシング8の外側が空気側になり、ガスメータが屋外に設置された場合、高い湿度やオゾン、温度変化などの過酷な環境にさらされることになる。そして、その中で、ガスメータの使用期間(一般に10年間)中特にメンテナンスしなくても、ガス漏れなどが発生しない高い信頼性が要求されている。
【0054】
本実施例の遮断弁は、弾性体シール部材58を隔壁47の円筒部47c外周と取り付け板57段差部57b内周との間に円周方向に圧縮して配しているため、シール部材58の圧縮率は隔壁47の円筒部47c外径と取り付け板57の段差部57b内径で決定され、隔壁47と取り付け板57の軸方向の位置の微小な変動にはほとんど影響されない。そして、組立時に嵌合部57cの隙間発生などによる隔壁47と取り付け板57との若干の軸方向の位置ずれが発生した場合や、長期間使用している間に腐食によって嵌合部57cがゆるみ隔壁47と取り付け板57との固着のゆるみなどが発生した場合や、ふた49のつば部49cのクリープ変形によって、取り付け板57の段差部57bの底面57dと隔壁47のつば47eとに隙間を生じた場合でも、シール部材58の圧縮率はほとんど影響を受けず、気密性に関して高い信頼性を持った遮断弁を提供することができる。
【0055】
また、隔壁47の大径の円筒部47cの開放端に中心に軸受49aを配された合成樹脂製のふた49を嵌挿し、このふた49の外周のつば部49cを隔壁47の開放端のつば47eと取り付け板57段差部57bの底面57dとで挟んで保持し、この隔壁47を支持フレーム59(付勢手段)で取り付け板57の方向に付勢しているので、ふた49と一体的に隔壁47の開放端側の軸受49aを容易に配置できるとともに、温度変化によるふた49の膨張収縮でシール部材58の圧縮率が影響を受けず、かつ、隔壁47は支持フレーム59(付勢手段)で取り付け板57の方向へ付勢されているので、温度変化によるふた49の膨張収縮で隔壁47と取り付け板57との組付けがゆるまず、気密性に関してより高い信頼性を持った遮断弁を提供することができる。
【0056】
また、シール部材58が取り付け板57段差部57bから脱落することを防止するバックアップリング60を、ステータ46とシール部材58との間に配しているので、取り付け板57段差部57bのコーナー57eのR部より深くシール部材58を挿入することが可能で、かつ、取り付け板57の段差部57bとバックアップリング60との径方向の隙間すなわちはみ出し隙間も小さくすることができるため、組立時にシール部材60が取り付け板57の段差部57bコーナー57eに巻き込みまれたり、コーナー57eのR部に食い込むことを防止でき、気密性に関してより高い信頼性を持った遮断弁を提供することができる。
【0057】
なお、図1において、励磁コイル43、第1の電磁ヨーク44、第2の電磁ヨーク45のセットは2セットとしたが、3セットでも、より多数でもよい。また、ステータ46、隔壁47は支持フレーム59で取り付け板57に嵌着するとしたが、支持フレームがなく相互に溶接で固定されていてもよい。ただし、この場合はふた49のつば部49cが熱ストレスによる膨張を吸収してクリープ変形するので注意が必要である。また、ふた49にリブ50を設け、移動体61に凹状部61eを設けるとしたが、第2の軸受に溝を設け、移動体に凸状部を設けて係合させ回転防止手段としてもよく、取り付け板もしくは第2の軸受に中心からオフセットした棒を突出させ、移動体に穴もしくは溝を形成し係合させることによって回転防止手段としてもよい。また、スラスト軸受は滑り軸受であるスラストワッシャ67、68としたが、ボールベアリングなどの転がり軸受でもよい。ただし、マイコンメータの遮断弁の場合は、長期間にわたって開弁静止状態で放置されることが多いため、潤滑油の使用は好ましくない。また、直動機構は送りネジ52と移動体61の係合部とのネジ機構としたが円筒カム機構でもよく、送りネジ52は回転軸53に形成しているが、回転軸から減速機構を経て直動機構へ入力してもよい。また、弁体62と移動体61とは別部品としたが、一体的に構成されてもよい。弁シート63は弁シート保持部材64を抱き込んでいるとしたが、中央で嵌合してもよく、弁シート保持部材に中心軸を形成して弁シートを気密に貫通させ別の固定部材で締結してもよい。
【0058】
(実施例2)
図4は本発明の実施例2の遮断弁の開弁状態の断面図である。
【0059】
ステータ46の内側に、2段の底と、大小の円筒部47c、47dと、大径の円筒部47cの開放端につば47eを有する貫通孔のないなべ状に成形された隔壁が47配されている。隔壁47の小径の円筒部47d内面に転がり軸受である第1の軸受73が配されている。隔壁47の大径の円筒部47cの開放端には中央に転がり軸受である第2の軸受71を有する合成樹脂製のふた74が嵌挿されている。ふた74には中心軸からオフセットしてピン75が配されている。隔壁47の内部には、送りネジ77をふた74から突出させて、ロータ76が配されている。
【0060】
流体室56に取り付け可能な取り付け板78は、中央に中心孔78aと隔壁の大径の円筒部47cの外径より若干大きな内径を持った円筒状段差部78bを形成され、段差部78bには隔壁47の大径の円筒部47cの端部が挿入され、ふた74の円筒部74bが流体室56側に中心孔78aを貫通して、円筒部47cの外周と段差部78bの内周との間には、合成ゴム製Oリングなどの弾性体シール部材58が隔壁47の中心軸に対して円周方向に圧縮されて配されている。ふた74のつば部74cには、取り付け板78の段差部78bの底面78dに向かって突出した小さい突起状の寸法吸収部79が形成され、つば部74cは、取り付け板78の段差部78bの底面78dと隔壁47のつば47eとに挟まれて保持されている。
【0061】
図5に本発明の実施例2の遮断弁のふた74の斜視図を示した。(a)は寸法吸収部79aが複数の小さい突起である場合、(b)は寸法吸収部79bが細い円周リブである場合の例である。
【0062】
ステータ46の外側に隔壁47がステータ46の外側に突出しすぎないよう、軸方向の相対位置を規制して形成された金属性の支持板72(付勢手段)が配され、取り付け板78とステータ46の各電磁ヨークと支持板72(付勢手段)とは、それぞれ相互に溶接で固着されている。ステータ46とシール部材58との間には、シール部材58が取り付け板78の段差部78bから脱落することを防止するバックアップリング60が配されている。そして、前記支持板72(付勢手段)によって軸方向の寸法が規制されたとき、このバックアップリング60と隔壁47のつば47eとの間に一定の軸方向寸法を有するシール部材58を収納可能なハウジングが形成される。
【0063】
このため、シール部材58が軸方向に無理な圧縮を受けることがなく過圧縮状態になりにくいため、圧縮永久ひずみを発生して気密性が劣化することを防止できる。
【0064】
隔壁47とふた74とシール部材58とバックアップリング60とステータ46と支持板72(付勢手段)を組み立てたとき、ステータ46の取り付け板78との当接面46aからふた74の寸法吸収部79までの軸方向長さは、取り付け板78の段差部78bの深さより若干長くなっていて、前記隔壁47等の組立品をふた74に挿入した際に、この寸法吸収部79の先端だけが選択的に変形しながら組み付けられ、その他の部分に大きな応力を伝えない。
【0065】
このため、シール部材58の入る部分の寸法を確保したまま、取り付け板78と隔壁47の開放端でふた74を強固に挟持でき、ふた74の寸法吸収部79以外の部分や隔壁47に大きな応力をつたえないために、ふた74全体やふた74に配された第2の軸受71、隔壁47を変形させず、気密性と動作特性の信頼性を持った遮断弁を実現できる。
【0066】
弁体80は弁シート81と弁シート保持部材82で構成され、弁体80の凹部に弁シート保持部材82の凸部が挿着されている。弁シート保持部材82のロータ46側には送りネジ77と螺合可能な雌ねじ82aと、ピン75と係合可能なガイド溝82bが形成されている。
【0067】
なお、実施例1と同一符号のものは同一構造を有し、説明は省略する。また、各部詳細は第1実施例と同様のため、説明は省略する。
【0068】
この遮断弁の動作は、実施例1とほぼ同じであるので、詳細の説明を省略する。実施例1と異なるのは、この遮断弁は弁体80と移動体(雌ねじ82a)が一体的に構成されていてコイルスプリングがないため、遮断動作は、ロータ76が回転し、弁体80が移動して弁座65に当接し、弁シート81が撓んで、ロータ76の回転が停止することで完了することである。この遮断弁は、閉弁時の弁体の締めきりを弁シート81の弾性力に頼っているので、コイルスプリング66で安定した付勢力を与える実施例1と比較して、閉弁安定性が若干劣っているが、部品点数が削減できるので経済的な効果はある。
【0069】
このように、実施例2の遮断弁は、シール部材58が軸方向に圧縮を受けることによって過圧縮状態になり気密性が劣化することを防止でき、また、シール部材58の入る部分の寸法を確保したまま、取り付け板78と隔壁47の開放端でふた74を強固に挟持でき、ふた74全体やふた74に配された第2の軸受71、隔壁47を変形させず、気密性と動作特性の信頼性を持った遮断弁を提供することができる。
【0070】
なお、図4において、第1の軸受73、第2の軸受71は転がり軸受としたが、滑り軸受でもよく、第2の軸受71はふた74と一体的に成形されていてもよい。また、支持板72(付勢手段)は金属性としたが合成樹脂製でもよく、ステータ46に溶接されているとしたが、嵌合でもよく、取り付け板78に係合してもよい。取り付け板78とステータ46の各電磁ヨークと支持板72(付勢手段)とは、それぞれ相互に溶接で固着されているとしたが、互いに嵌合していてもよく、支持板72などの付勢手段が取り付け板78に嵌合することによって保持されていてもよい。また、回転防止手段であるピン75は第2の軸受72と一体に形成してもよい。
【0071】
【発明の効果】
以上のように本発明によれば、貫通穴のないなべ状に成形された剛体性の隔壁と、流体室に取り付け可能でこの隔壁の円筒部外径より若干大きな内径の円筒状段差部を形成された剛体性の取り付け板と、この隔壁の円筒部外周とこの取り付け板段差部内周との間に円周方向に圧縮して弾性体製のシール部材を配したため、シール部材の圧縮率は剛体製の隔壁の円筒部外径と剛体製の取り付け板の段差部内径で決定され、隔壁と取り付け板の軸方向の位置の微小な変動にはほとんど影響されない。そして、組立時にかしめ部の隙間発生などによる隔壁と取り付け板との若干の軸方向の位置ずれが発生した場合や、長期間使用している間に腐食や熱膨張などによって隔壁と取り付け板との固着のゆるみなどが発生した場合でも、シール部材の圧縮率はほとんど影響を受けず、気密性に関して高い信頼性を持った遮断弁を提供することができるといった有利な効果を有する。
【0072】
また、隔壁の開放端に中心に軸受を配された合成樹脂製のふたを嵌挿し、このふたの外周部を隔壁の開放端と取り付け板段差部の底面とで挟んで保持し、この隔壁を付勢手段で取り付け板の方向に付勢したため、ふたと一体的に隔壁の開放端側の軸受を容易に配置できるとともに、温度変化によるふたの膨張収縮でシール部材の圧縮率が影響を受けず、かつ、隔壁は付勢手段で付勢されているので、温度変化によるふたの膨張収縮で隔壁と取り付け板との組付けがゆるまず、気密性に関してより高い信頼性を持った遮断弁を提供することができるといった有利な効果を有する。
【0073】
また、付勢手段は隔壁とステータの軸方向の相対位置を規制するよう形成され、前記ふたの挟持部に変形することによってふたの取り付け板に対する軸方向位置を変えることができる突起もしくは円周リブ状の寸法吸収部を形成したため、隔壁とふたとステータと付勢手段の組み付けの際に、付勢手段で隔壁とステータの軸方向の相対位置が規制されて隔壁の円筒部外周でステータから突出する部分の長さが規制され、シール部材が軸方向に圧縮を受けることによって過圧縮状態になり気密性が劣化することを防止できる。また、組付け時に、ふたの挟持部の突起またはリブ状の寸法吸収部が、付勢手段の付勢力で選択的に変形し、ふたのほかの部分や隔壁に大きな応力をつたえないために、シール部材の入る部分の寸法を確保したまま、取り付け板と隔壁の開放端でふたを強固に挟持でき、ふた全体やふたに配された軸受、隔壁を変形させず、気密性と動作特性の信頼性を持った遮断弁を提供することができるといった有利な効果を有する。
【0074】
また、シール部材が取り付け板段差部から脱落することを防止するバックアップリングを、ステータとシール部材との間に配したため、取り付け板円筒段差部の前記コーナーのR部より深くシール部材を挿入することが可能で、かつ、はみ出し隙間も小さくすることができるため、隔壁とステータとの組立品と取り付け板の組立の際に、シール部材が取り付け板の円筒段差部コーナーに巻き込みまれたり、前記コーナーRに食い込むことを防止でき、気密性に関してより高い信頼性を持った遮断弁を提供することができるといった有利な効果を有する。
【図面の簡単な説明】
【図1】本発明の実施例1の遮断弁の開弁状態の断面図
【図2】同遮断弁の遮断動作中の断面図
【図3】同遮断弁の閉弁状態の断面図
【図4】本発明の実施例2の遮断弁の開弁状態の断面図
【図5】(a)本発明の実施例2の遮断弁において、突起を有する場合のふたの斜視図
(b)同遮断弁において、円周リブを有する場合のふたの斜視図
【図6】従来の遮断弁の開弁状態の断面図
【符号の説明】
43 励磁コイル
46 ステータ
47 隔壁
57、78 取り付け板
58 シール部材
55、76 ロータ
53 回転軸
61 移動体(弁機構)
62、80 弁体(弁機構)
59 支持フレーム(付勢手段)
72 支持板(付勢手段)
49、74 ふた
79 寸法吸収部
60 バックアップリング
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shut-off valve used as a shut-off mechanism of a gas shut-off device. More specifically, the shut-off operation of a flow path is performed by moving a valve body forward or backward relative to a valve seat formed in the flow path. The present invention relates to a shut-off valve using a motor as a power source.
[0002]
[Prior art]
In order to prevent gas accidents, various types of safety devices have been used in the past.In particular, when the flow rate sensor built in the gas meter monitors the gas flow rate and the microcomputer determines that the gas usage status is abnormal, Microcomputer-equipped gas with a battery power source that shuts off the gas with a shut-off valve built in the gas meter when the status of sensors such as earthquake sensors, gas pressure sensors, gas alarms, carbon monoxide sensors, etc. The gas meter with built-in shut-off device (hereinafter abbreviated as microcomputer meter) has been promoted for its advantages such as safety, ease of gas piping, and low price, and in recent years, almost all households have become popular. In addition, the ratio of centralized monitoring micrometers that have a telemeter function that centrally monitors the gas flow rate information measured by the flow sensor using a telephone line will increase, and the convenience of information terminals will increase. It has been demanded. In this central monitoring type microcomputer meter, etc., gas can be shut off and restored by electric energy from the battery installed in the microcomputer meter so that gas can be shut off and restored by simple electric switch operation or remote operation by telephone line etc. On the other hand, a shut-off valve that does not require energy is required to maintain the open and closed states.
[0003]
As the drive system for this shut-off valve, the one that used an electromagnetic solenoid has been the mainstream. However, in recent years, a relatively strong closing force and return force can be realized. A shut-off valve with a gas-tight partition with the rotor inside the gas flow path and the stator outside the gas flow path is the mainstream because it is easy to attach to the gas flow path. .
[0004]
A conventional shut-off valve will be described below.
[0005]
Conventional shut-off valves of this type are generally shown in Japanese Patent Application Laid-Open Nos. 9-60752 and 11-2352. As shown in FIG. 6, the shut-off valve described in Japanese Patent Application Laid-Open No. 11-2352 has a cup-shaped casing 6 with a hook, and a stator 4 is mounted on the outer periphery of the casing 6 to open the casing. The outer bush 3 made of synthetic resin is fitted into the portion, the stud 5 is eccentrically placed on the outer bush 3 and protrudes forward, the inner bush 12 is inserted into the casing 6, and the outer bush 3 and the A lead screw 17 is supported on the inner bush 12 so that a male screw portion 17a at the tip protrudes forward from the outer bush 3 so as to be rotatable in the forward and reverse directions. The rotor 16 is opposed to the stator 4 on the lead screw 17. A thrust load rolling bearing 18 is inserted between the rotor 16 and the outer bush 3, Engage the pentad 5 is arranged a valve body 25 screwed to the male screw portion 17a. The elastic seal member 8, the outer bush 3 and the casing 6 are sandwiched between the stepped flange 2 and the flat plate flange 7, and the stepped flange 2 and the flat plate flange 7 are fixed by caulking.
[0006]
The operation of the shut-off valve configured as described above will be described below.
[0007]
When the gas is abnormally used, the rotor 16 is rotated forward by energization from a control unit (not shown), the lead screw 17 rotates in the forward direction, and the valve body 25 is moved from the lead screw 17 side to the valve seat 26 side. By moving forward and abutting on the valve seat 26, the fluid path is closed to shut off the fluid. When restoring this, the lead screw 17 is rotated in the reverse direction by an external input, the valve body 25 is retracted from the valve seat 26 side to the lead screw 17 side, the fluid path is opened, and the fluid supply is resumed. It was.
[0008]
[Problems to be solved by the invention]
When this type of shut-off valve is attached to a gas meter, the outside of the casing 8 is on the air side, and when the gas meter is installed outdoors, it is exposed to harsh environments such as high humidity, ozone, and temperature changes. . Among them, there is a demand for high reliability that does not cause gas leakage even if maintenance is not particularly performed during the period of use of the gas meter (generally 10 years).
[0009]
In the conventional shut-off valve described above, the elastic seal member 8 is sandwiched between the stepped flange 2 and the flat plate flange 7 in the thrust direction, and the compression rate of the elastic seal member 8 depends on the step depth of the stepped flange 2. However, it is assumed that the stepped flange 2 and the flat plate flange 7 are sufficiently caulked. However, in the caulking method, pressurization before caulking is sometimes insufficient, and a gap may be formed in the caulking portion. At this time, when the elastic seal member 8 is compressed in the thrust direction as in a conventional shut-off valve, There has been a problem that the compression rate becomes insufficient and the airtightness may deteriorate during long-term use.
[0010]
Further, since the base material is greatly deformed in the caulking portion, the surface treatment film is often peeled off or cracked during caulking, and further, the contact portion between the stepped flange 2 and the flat plate flange 7 has moisture. It remains easily, and the caulking portion and the contact portion between the stepped flange 2 and the flat plate flange 7 corrode during long-term use, and the flat plate flange 7 is lifted from the stepped flange 2, and the compression rate of the elastic seal member 8 is insufficient. Therefore, there is a problem that airtightness may deteriorate during long-term use.
[0011]
Further, since the elastic seal member 8, the synthetic resin outer bushing 3 and the casing 6 are sandwiched between the stepped flange 2 and the flat plate flange 7 at the same time, the stepped flange 2 is expanded and contracted by the temperature change. And the flat flange 7 is loosened and the compression rate of the elastic seal member 8 becomes insufficient, or the outer bush 3 expands in the radial direction to make the elastic seal member 8 overcompressed and promote compression set, It had the subject that airtightness might deteriorate during long-term use.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a shut-off valve having a high reliability in terms of airtightness, with the compression rate of the seal member hardly changing in a long-term use.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a rigid partition formed in a pan-like shape without a through hole, and a cylindrical step portion that can be attached to a fluid chamber and has an inner diameter slightly larger than the outer diameter of the cylindrical portion of the partition. An elastic sealing member is disposed between the formed rigid mounting plate, and the outer periphery of the cylindrical portion of the partition wall and the inner periphery of the stepped portion of the partition wall in a circumferential direction.
[0014]
For this reason, the compression ratio of the seal member is determined by the outer diameter of the cylindrical portion of the rigid partition wall and the inner diameter of the stepped portion of the rigid mounting plate, and is hardly affected by minute fluctuations in the axial position of the partition wall and the mounting plate. . In addition, if the axial displacement between the partition wall and the mounting plate occurs due to the occurrence of caulking gaps during assembly, or if there is corrosion or thermal expansion during long-term use, the partition wall and the mounting plate Even when the looseness of the sticking occurs, the compression rate of the seal member is hardly affected, and a shut-off valve having high reliability with respect to airtightness can be provided.
[0015]
In addition, a synthetic resin lid with a bearing at the center is inserted into the open end of the partition wall, and the outer periphery of the cover is held between the open end of the partition wall and the bottom surface of the mounting plate step portion. It is biased in the direction of the mounting plate by the biasing means.
[0016]
As a result, the bearing on the open end side of the partition wall can be easily disposed integrally with the lid, the compression rate of the seal member is not affected by the expansion and contraction of the lid due to temperature change, and the partition wall is biased by the biasing means. Therefore, it is possible to provide a shut-off valve with higher reliability in terms of airtightness because the assembly of the partition wall and the mounting plate is not loosened due to the expansion and contraction of the lid due to temperature change.
[0017]
The biasing means is formed so as to restrict the relative position of the partition wall and the stator in the axial direction, and a protrusion or a circumferential rib that can change the axial position of the lid with respect to the mounting plate by being deformed to the lid clamping portion. A shaped dimension absorbing portion is formed.
[0018]
Thus, when the partition wall, the lid, the stator, and the biasing means are assembled, the relative position in the axial direction of the partition wall and the stator is regulated by the biasing means, and the length of the portion protruding from the stator on the outer periphery of the cylindrical portion of the partition wall is reduced. It is possible to prevent the sealing member from being over-compressed by being compressed in the axial direction and being deteriorated in airtightness. In addition, when assembling, the protrusion of the lid clamping part or the rib-shaped dimension absorbing part is selectively deformed by the urging force of the urging means, so that no large stress is applied to other parts of the lid or the partition wall. The lid can be firmly held between the mounting plate and the open end of the bulkhead while maintaining the dimensions of the part where the seal member is inserted, and the entire lid, the bearings placed on the lid, and the bulkhead are not deformed. A shut-off valve having a sex can be provided.
[0019]
Further, a backup ring for preventing the seal member from falling off the mounting plate step portion is arranged between the stator and the seal member.
[0020]
When assembling the assembly of the partition wall and the stator and the mounting plate, a sealing member is usually fitted to the outer periphery of the cylindrical portion of the partition wall, and then the sealing member is inserted into the cylindrical step portion of the mounting plate.
At this time, there is a risk that the sealing member is caught in the cylindrical stepped portion corner of the mounting plate or the sealing member bites into the R portion of the corner and the airtightness is lowered, but a backup ring is formed on the side surface of the mounting plate of the stator. Therefore, the seal member can be inserted deeper than the R portion of the corner of the mounting plate cylindrical step portion, and the protruding gap can be reduced. Can be prevented from getting caught in the corner R, and can be provided with a shut-off valve having higher reliability in terms of airtightness.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
The shut-off valve according to the present invention includes a stator having an exciting coil, a rigid partition wall coaxially disposed inside the stator and shaped like a pan without a through hole, and a cylinder of the partition wall that can be attached to a fluid chamber. A rigid mounting plate formed with a cylindrical step portion having an inner diameter slightly larger than the outer diameter of the portion, and a compression between the outer periphery of the cylindrical portion of the partition wall and the inner periphery of the mounting plate step portion. A sealing member made of an elastic body, a rotor disposed inside the partition so as to face the stator, and a valve mechanism disposed on a rotating shaft of the rotor , wherein the partition has an open end It has a collar, and the collar is inserted into the mounting plate step portion together with the seal member .
[0022]
The compression rate of the seal member is determined by the cylindrical part outer diameter of the rigid partition wall and the stepped part inner diameter of the rigid attachment plate, and has little effect on minute fluctuations in the axial position of the partition wall and the attachment plate. If there is a slight axial misalignment between the partition wall and the mounting plate due to gaps in the caulking part during assembly, or if the partition wall and the mounting plate are stuck due to corrosion or thermal expansion during long-term use Even when loosening occurs, the compression rate of the seal member is hardly affected, and a shut-off valve having high reliability with respect to airtightness can be provided.
[0023]
In addition to the above features, the shut-off valve of the present invention has a biasing means for biasing the partition wall in the direction of the mounting plate, and a synthetic resin lid fitted with a bearing at the center of the open end of the partition wall. a, in which the outer peripheral portion of the lid and held by being sandwiched between the bottom surface of the collar and the mounting plate step portion.
[0024]
In addition, the bearing on the open end side of the partition wall can be easily arranged integrally with the lid, the compression rate of the seal member is not affected by the expansion and contraction of the lid due to temperature change, and the partition wall is biased by the biasing means. Therefore, the assembly of the partition wall and the mounting plate is not loosened due to the expansion and contraction of the lid due to temperature change, and a shutoff valve with higher reliability in terms of airtightness can be provided.
[0025]
In addition to the above two features, the shutoff valve of the present invention is a lid that is formed so as to restrict the relative position of the partition wall and the stator in the axial direction, and is sandwiched between the open end of the partition wall and the bottom surface of the mounting plate step portion. A protrusion or a circumferential rib-shaped dimension absorbing portion that can change the axial position of the lid with respect to the mounting plate by being deformed is formed in the holding portion.
[0026]
When the partition wall, the lid, the stator, and the biasing means are assembled, the relative position in the axial direction of the partition wall and the stator is regulated by the biasing means, and the length of the portion protruding from the stator on the outer periphery of the cylindrical portion of the partition wall is regulated. In addition, it is possible to prevent the seal member from being over-compressed by being compressed in the axial direction and airtightness being deteriorated. In addition, when assembling, the protrusion of the lid clamping part or the rib-shaped dimension absorbing part is selectively deformed by the urging force of the urging means, so that no large stress is applied to other parts of the lid or the partition wall. The lid can be firmly held between the mounting plate and the open end of the bulkhead while maintaining the dimensions of the part where the seal member is inserted, and the entire lid, the bearings placed on the lid, and the bulkhead are not deformed. A shut-off valve having a sex can be provided.
[0027]
In addition to the above features, the shut-off valve of the present invention has a backup ring that is disposed between the stator and the seal member and prevents the seal member from falling off the mounting plate step portion.
[0028]
When assembling the assembly of the partition wall and the stator and the mounting plate, normally, after the sealing member is fitted to the outer periphery of the cylindrical portion of the partition wall, the sealing member is inserted into the cylindrical step portion of the mounting plate. At this time, there is a risk that the sealing member is caught in the cylindrical stepped portion corner of the mounting plate or the sealing member bites into the R portion of the corner and the airtightness is lowered, but a backup ring is formed on the side surface of the mounting plate of the stator. Therefore, the seal member can be inserted deeper than the R portion of the corner of the mounting plate cylindrical step portion, and the protruding gap can be reduced. Can be prevented from getting caught in the corner R, and can be provided with a shut-off valve having higher reliability in terms of airtightness.
[0029]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0030]
Example 1
1, FIG. 2, and FIG. 3 are cross-sectional views of the shut-off valve according to the first embodiment of the present invention in the open state, during the shut-off operation, and in the closed state, respectively.
[0031]
In FIG. 1, an exciting coil 43 in which a conducting wire 42 is wound on a substantially bobbin-shaped coil bobbin 41, a first electromagnetic yoke 44 having a cylindrical portion on the outer periphery and a comb-shaped magnetic pole on the inner periphery, Two sets of the second electromagnetic yoke 45 having a generally disc shape and a comb-shaped magnetic pole on the inner periphery, which are arranged so as to sandwich the exciting coil 43 between the electromagnetic yoke 44 and the second one, are mutually connected. The electromagnetic yoke 45 is arranged in contact with the disk portion to form a stator 46. The coil bobbin 41 is preferably made of synthetic resin and has heat resistance such as polybutylene terephthalate (PBT) and good electrical insulation.
[0032]
The first electromagnetic yoke 44 and the second electromagnetic yoke 45 are made of a steel plate such as a low-carbon steel plate, an electromagnetic soft iron plate, or a silicon steel plate, and are subjected to rust prevention treatment such as galvanization, aluminum plating, and chromic acid treatment film on the surface. Economically, a pre-plated steel plate such as a galvanized steel plate is desirable. The comb-shaped magnetic poles of the first electromagnetic yoke 44 and the second electromagnetic yoke 45 mesh with a predetermined gap, and the two sets of comb teeth are substantially the same as the other sets of comb teeth in the rotation direction. It arrange | positions so that it may be located in a clearance gap part.
[0033]
Coaxially inside the stator 46, there are two stages of bottom holes 47a and 47b, large and small cylindrical portions 47c and 47d, and a large diameter cylindrical portion 47c with a flange 47e at the open end of the large diameter cylindrical portion 47c. There is no metallic partition 47. The material of the partition wall 47 can be selected from rigid bodies such as non-magnetic stainless steel plates, copper alloys, aluminum alloys, synthetic resins, and ceramics, but for reasons such as corrosion resistance, strength, creep resistance, and thin wall workability, austenite A stainless steel plate drawn by drawing is optimal, and a solution obtained by applying a solution heat treatment after drawing to remove residual internal stress and crystal grain refinement is desirable.
[0034]
A first bearing 48 made of synthetic resin having a center hole 48a is fitted into the inside of the side surface of the small-diameter cylindrical portion 47d of the partition wall 47. The cylindrical portion 47d of the partition wall 47 and the first bearing 48 are fitted with an interference fit. Between the fitting portion 48b of the first bearing 48 and the center hole 48a, a thin rippled stress relaxation portion 48c is formed.
[0035]
Further, a stopper 48d is formed so as to contact the bottom 47a of the partition wall 47.
The material of the first bearing 48 is selected from synthetic resins having self-lubricating properties such as various synthetic resins in which polyacetal (POM), polyamide (PA) and polytetrafluoroethylene (PTFE) powder and graphite particles are blended. Although possible, polyacetal is the best because of its low coefficient of friction and economic reasons. Since this polyacetal has a relatively large stress creep and is soft, when setting an interference fit, it is necessary to set a relatively large allowance. For example, the inner diameter of the cylindrical portion 47d of the partition wall 47 is 8 mm. In this case, the outer diameter of the fitting portion 48b of the first bearing 48 is appropriately about 8.05 to 8.1 mm.
[0036]
On the open end side of the pan side surface of the large-diameter cylindrical portion 47c of the partition wall 47, a synthetic resin lid 49 having a second bearing 49a, a cylindrical portion 49b on the side surface, and a collar portion 49c on the outer periphery is coaxially provided. 49c is inserted in contact with the flange 47e of the partition wall 47. The cylindrical portion 47c of the partition wall 47 and the fitting insertion portion 49e of the lid 49 are fitted with an interference fit. Between the fitting portion 49e of the lid 49 and the second bearing 49a, a thin rippled stress relaxation portion 49d is formed.
[0037]
As the material of the lid 49, polyacetal is optimal as in the first bearing 48. The interference fit between the cylindrical portion 47c of the partition wall 47 and the fitting insertion portion 49e of the lid 49 may be relatively loose because there is another fixing means described later, and to prevent the disk portion 49f from wavy. For example, when the inner diameter of the cylindrical portion 47c of the partition wall 47 is 18 mm, the outer diameter of the fitting insertion portion 49e of the lid 49 is appropriately about 18.02 to 18.08. On the inner surface of the cylindrical portion 49b of the lid 49, convex ribs 50 parallel to the central axis are formed at two locations 180 ° apart on the circumference.
[0038]
Inside the partition wall 47, a cylindrical permanent magnet 51 polarized in the circumferential direction, a rotating shaft 53 having a feed screw 52 formed at one end, the permanent magnet 51, and the rotating shaft 53 are held coaxially. A rotor 55 composed of a sleeve 54 that rotates is loosened so that the end of the rotary shaft 53 on the side of the feed screw 52 can be rotated to the second bearing 49a of the lid 49 and the opposite end can be rotated to the center hole 48a of the first bearing 48. It is inserted and arranged.
[0039]
A mounting plate 57 that can be attached to the fluid chamber 56 is formed with a cylindrical stepped portion 57b having an inner diameter slightly larger than the outer diameter of the central hole 57a and the large-diameter cylindrical portion 47c of the partition wall 47 at the center. A claw-like fitting part 57c is formed at the place. The end of the large-diameter cylindrical portion 47c of the partition wall 47 is inserted into the stepped portion 57b, and the cylindrical portion 49b of the lid 49 passes through the center hole 57a and protrudes toward the fluid chamber 56, and the outer periphery of the cylindrical portion 47c and the stepped portion Between the inner periphery of 57 b, an elastic seal member 58 such as a synthetic rubber O-ring is compressed in the circumferential direction with respect to the central axis of the partition wall 47. The flange portion 49 c of the lid 49 is held between the bottom surface 57 d of the stepped portion 57 b of the attachment plate 57 and the flange 47 e of the partition wall 47.
[0040]
A stator 46 is disposed in contact with the partition plate 47 side surface of the mounting plate 57. The stator 46 and the partition wall 47 are pressed against each other and sandwiched between the mounting plate 57 and both ends thereof are fitted portions 57c of the mounting plate 57. A substantially U-shaped support frame 59 (biasing means) is disposed. The support frame 59 is formed with an engaging portion 59 b that can be engaged with the stator 46 to prevent the stator 46 from rotating.
[0041]
In this example, the engaging portion 59b has a convex shape when viewed from the back, and the front end portion is inserted into and engaged with a hole opened in the electromagnetic yoke 44, and the electromagnetic yoke 44 is attached to the mounting plate 57 by the convex stepped portion. It is energizing to the side. Between the stator 46 and the seal member 58, a backup ring 60 for preventing the seal member 58 from dropping from the stepped portion 57b of the mounting plate 57 is disposed. The material of the mounting plate 57 and the support frame 59 is a rigid material having gas resistance, corrosion resistance and strength, such as surface-treated steel plate, stainless steel plate, copper alloy plate and aluminum alloy plate. A treated steel plate is easy to select.
[0042]
The moving body 61 disposed in the fluid chamber 56 has a center hole 61a screwed into the feed screw 54 of the rotating shaft 53, a substantially disk-shaped spring receiver 61b formed on the stator 46 side, and a large diameter at the other end. An engagement ring portion 61c is formed, and a cylindrical portion 61d having a small diameter is formed between them. On the outer periphery of the spring receiver 61b, concave portions 61e (not shown) that can be engaged with the ribs 50 of the lid 49 are formed at four locations at intervals of 90 ° on the circumference. When the concave portion 61 e is engaged with the rib 50, the rotation of the moving body 61 and the bearing 49 is prevented, and the rotation operation of the feed screw 54 is converted into the front-rear operation of the moving body 61. The material of the moving body 61 can be selected from synthetic resins having self-lubricating properties such as polyacetal (POM), polyamide (PA), polytetrafluoroethylene (PTFE) powder, and various synthetic resins blended with graphite particles. However, polyacetal is optimal because of its low friction coefficient and economic reasons.
[0043]
The valve body 62 is in contact with a side surface of the stator 46 of the valve seat 63 and a flexible valve seat 63 made of synthetic rubber or the like that is substantially disc-shaped and capable of coming into contact with a valve seat 65 formed in the fluid chamber 56. It comprises a rigid valve seat holding member 64 such as a synthetic resin. The valve seat 63 does not have a through hole, and an engagement ring portion 63 a is formed on the outer periphery, and the valve seat 63 is loosely fitted so as to embrace the valve seat holding member 64.
[0044]
The valve seat protection member 64 has a cylindrical portion 64b that protrudes toward the stator 46 and has an inner diameter that is substantially equal to the outer diameter of the engagement ring portion 61c of the moving body 61 and is formed with a longitudinally split 64a in the axial direction. At the end of 64 b, there is an engaging claw 64 c projecting inward that has an inner diameter smaller than the outer diameter of the engaging ring portion 61 c of the moving body 61 and substantially equal to the outer diameter of the cylindrical portion 61 d of the moving body 61. It is arranged together. A gap 69 is provided between the tip of the cylindrical portion 64 b of the valve seat holding member 64 and the spring receiver 61 b of the moving body 61. The material of the valve seat holding member 64 is preferably a synthetic resin material having gas resistance such as polyacetal (POM), polyamide (PA), polybutylene terephthalate (PBT).
[0045]
A coil spring 66 having an inner diameter substantially equal to the outer diameter of the cylindrical portion 64 b of the valve seat holding member 64 is compressed and held between the moving body 61 and the valve seat holding member 64.
[0046]
The moving body 61 and the valve body 62 constitute a valve mechanism.
[0047]
Between the sleeve 54 of the rotor 55 and the first bearing 48 and the lid 49, a thrust washer made of a synthetic resin having self-lubricating properties such as polytetrafluoroethylene (PTFE) or polyamide (PA) blended with graphite particles. 67 and 68 are arranged.
[0048]
Next, the operation and action of the shutoff valve of the first embodiment will be described.
[0049]
When the gas usage state is not abnormal and the signals from various sensors do not indicate danger, there is no power supply from the control unit (not shown so far) of the microcomputer meter, and the shut-off valve is as shown in FIG. The moving body 61 is on the stator 46 side, the valve body 62 is kept open from the valve seat 65, and gas can flow therethrough.
[0050]
When the usage state of the gas is abnormal or the signals from various sensors indicate danger, the control unit of the microcomputer meter applies a pulsed current having a phase difference to each conductive wire 42 of the exciting coil 43, and the rotor 55 is rotated forward. Since the moving body 61 is prevented from rotating because the concave portion 61 e is engaged with the rib 50, the rotation operation of the feed screw 54 interlocked with the rotor 55 is converted into the front-rear operation of the moving body 61 and is engaged with the moving body 61. The valve body 62 is moved to a position where the valve seat 63 abuts on the valve seat 65, and is in the state shown in FIG. When the moving body 61 further advances toward the valve seat 65, the coil spring 66 is further compressed, the tip of the cylindrical portion 64b of the valve seat holding member 64 and the spring receiver 61b of the moving body 61 come into contact, and the valve seat 63 bends. As a result, the repulsive force of the moving body 61 finally becomes larger than the thrust of the feed screw 54, and the rotation of the rotor 55 is stopped. Thus, the valve body 62 is urged against the valve seat 65 by the coil spring 66 and the gas is shut off. The shut-off valve in the closed state is shown in FIG.
[0051]
Thereafter, even if the control unit of the microcomputer meter stops energization, the rotor 55 maintains the state due to the holding torque, and therefore the valve body 62 maintains the closed state in which the valve seat 65 is urged by the coil spring 66. To do.
[0052]
When the controller of the microcomputer meter determines that the danger is released from the signals from the various sensors and can be restored, or when the gas user recovers the dangerous condition and operates the return switch provided on the meter or remote control panel, When a gas supplier or the like sends a remote return command by communication, the control unit of the microcomputer meter applies a pulsed current having an opposite phase difference to each conducting wire 42 of the exciting coil 43 and rotates the rotor 55 in the reverse direction. Let Then, it is sent to the feed screw 54 and the moving body 61 moves to the stator 46 side, the valve body 62 is detached from the valve seat 65, and the gas can flow. The moving body 61 further moves to the stator 46 side. Finally, the moving body 61 comes into contact with the lid 49 and becomes a moving bottom dead center, and the rotation of the rotor 55 is stopped. Thereafter, even if the control unit of the microcomputer meter stops energization, the rotor 55 maintains the state due to the holding torque, and maintains the valve open state shown in FIG.
[0053]
Now, when this type of shut-off valve is attached to the gas meter, the outside of the casing 8 is on the air side, and when the gas meter is installed outdoors, it is exposed to harsh environments such as high humidity, ozone, and temperature changes. become. Among them, there is a demand for high reliability that does not cause gas leakage even if maintenance is not particularly performed during the period of use of the gas meter (generally 10 years).
[0054]
In the shutoff valve of the present embodiment, the elastic seal member 58 is compressed in the circumferential direction between the outer periphery of the cylindrical portion 47c of the partition wall 47 and the inner periphery of the mounting plate 57 stepped portion 57b. The compression ratio is determined by the outer diameter of the cylindrical portion 47c of the partition wall 47 and the inner diameter of the stepped portion 57b of the mounting plate 57, and is hardly affected by minute fluctuations in the axial position of the partition wall 47 and the mounting plate 57. When the gap between the partition wall 47 and the mounting plate 57 is slightly displaced due to the occurrence of a gap in the fitting portion 57c during assembly, or the fitting portion 57c is loosened due to corrosion during long-term use. A gap is formed between the bottom surface 57d of the stepped portion 57b of the mounting plate 57 and the flange 47e of the partition wall 47 due to loosening of the fixing between the partition wall 47 and the mounting plate 57 or due to creep deformation of the flange portion 49c of the lid 49. Even in this case, the compression rate of the seal member 58 is hardly affected, and a shut-off valve having high reliability with respect to airtightness can be provided.
[0055]
Further, a synthetic resin lid 49 having a bearing 49 a disposed at the center is fitted into the open end of the large-diameter cylindrical portion 47 c of the partition wall 47, and the flange portion 49 c on the outer periphery of the lid 49 is inserted into the flange of the open end of the partition wall 47. 47e and the bottom surface 57d of the stepped portion 57b of the mounting plate 57, and the partition wall 47 is urged toward the mounting plate 57 by the support frame 59 (biasing means). The bearing 49a on the open end side of the partition wall 47 can be easily arranged, the compression rate of the seal member 58 is not affected by the expansion and contraction of the lid 49 due to temperature change, and the partition wall 47 is a support frame 59 (biasing means). Because of this, the assembly of the partition wall 47 and the mounting plate 57 is not loosened by the expansion and contraction of the lid 49 due to temperature change, and a shut-off valve with higher reliability in terms of airtightness is provided. Offer It can be.
[0056]
Further, since the backup ring 60 that prevents the seal member 58 from falling off the stepped portion 57b of the mounting plate 57 is disposed between the stator 46 and the seal member 58, the corner 57e of the stepped portion 57b of the mounting plate 57 is provided. The seal member 58 can be inserted deeper than the R portion, and the radial gap between the stepped portion 57b of the mounting plate 57 and the backup ring 60, that is, the protruding gap can be reduced. Can be prevented from being caught in the step 57b corner 57e of the mounting plate 57 or biting into the R portion of the corner 57e, and a shut-off valve with higher reliability in terms of airtightness can be provided.
[0057]
In FIG. 1, the set of the exciting coil 43, the first electromagnetic yoke 44, and the second electromagnetic yoke 45 is two sets, but may be three sets or more. Further, the stator 46 and the partition wall 47 are fitted to the mounting plate 57 by the support frame 59, but they may be fixed to each other by welding without the support frame. However, in this case, care must be taken because the collar portion 49c of the lid 49 absorbs expansion due to thermal stress and undergoes creep deformation. Further, the rib 49 is provided on the lid 49 and the concave portion 61e is provided on the moving body 61. However, a groove may be provided on the second bearing, and a convex portion may be provided on the moving body to be engaged therewith. Further, a rotation offset means may be provided by projecting a bar offset from the center to the mounting plate or the second bearing and forming a hole or groove in the movable body to engage with it. The thrust bearings 67 and 68, which are sliding bearings, are used as the thrust bearings, but may be rolling bearings such as ball bearings. However, in the case of a shut-off valve of a microcomputer meter, the use of lubricating oil is not preferable because it is often left in a stationary state for a long period of time. Further, the linear motion mechanism is a screw mechanism of the feed screw 52 and the engaging portion of the moving body 61, but it may be a cylindrical cam mechanism, and the feed screw 52 is formed on the rotating shaft 53. Then, it may be input to the linear motion mechanism. Further, although the valve body 62 and the moving body 61 are separate parts, they may be configured integrally. The valve seat 63 includes the valve seat holding member 64. However, the valve seat 63 may be fitted in the center, and a central axis is formed in the valve seat holding member so that the valve seat is airtightly penetrated and another fixing member is used. You may fasten.
[0058]
(Example 2)
FIG. 4 is a cross-sectional view of the shutoff valve in the opened state according to the second embodiment of the present invention.
[0059]
Inside the stator 46, there are 47 partition walls shaped like a pan without a through hole having a two-stage bottom, large and small cylindrical portions 47c and 47d, and an open end of the large diameter cylindrical portion 47c. ing. A first bearing 73, which is a rolling bearing, is disposed on the inner surface of the small-diameter cylindrical portion 47 d of the partition wall 47. A synthetic resin lid 74 having a second bearing 71 serving as a rolling bearing is fitted in the open end of the large-diameter cylindrical portion 47c of the partition wall 47. The lid 74 is provided with a pin 75 offset from the central axis. Inside the partition wall 47, a feed screw 77 protrudes from the lid 74 and a rotor 76 is arranged.
[0060]
A mounting plate 78 that can be attached to the fluid chamber 56 is formed with a cylindrical stepped portion 78b having an inner diameter slightly larger than the outer diameter of the central hole 78a and the large-diameter cylindrical portion 47c of the partition wall at the center. The end of the large-diameter cylindrical portion 47c of the partition wall 47 is inserted, and the cylindrical portion 74b of the lid 74 passes through the center hole 78a on the fluid chamber 56 side, and the outer periphery of the cylindrical portion 47c and the inner periphery of the stepped portion 78b. In between, an elastic seal member 58 such as a synthetic rubber O-ring is compressed in the circumferential direction with respect to the central axis of the partition wall 47. The flange portion 74 c of the lid 74 is formed with a small protrusion-shaped dimension absorbing portion 79 protruding toward the bottom surface 78 d of the stepped portion 78 b of the mounting plate 78, and the collar portion 74 c is the bottom surface of the stepped portion 78 b of the mounting plate 78. 78d and the flange 47e of the partition wall 47 are sandwiched and held.
[0061]
FIG. 5 shows a perspective view of the shut-off valve lid 74 according to the second embodiment of the present invention. (A) is an example in case the dimension absorption part 79a is a some small protrusion, (b) is an example in case the dimension absorption part 79b is a thin circumferential rib.
[0062]
A metallic support plate 72 (biasing means) formed by restricting the relative position in the axial direction is arranged outside the stator 46 so that the partition wall 47 does not protrude outside the stator 46, and the mounting plate 78 and the stator are arranged. Each electromagnetic yoke 46 and the support plate 72 (biasing means) are fixed to each other by welding. A backup ring 60 is provided between the stator 46 and the seal member 58 to prevent the seal member 58 from dropping off from the stepped portion 78b of the mounting plate 78. When the axial dimension is regulated by the support plate 72 (biasing means), the seal member 58 having a certain axial dimension can be accommodated between the backup ring 60 and the flange 47e of the partition wall 47. A housing is formed.
[0063]
For this reason, since the seal member 58 is not subjected to excessive compression in the axial direction and is not easily over-compressed, it is possible to prevent the occurrence of compression set and deterioration of the airtightness.
[0064]
When the partition wall 47, the lid 74, the seal member 58, the backup ring 60, the stator 46, and the support plate 72 (biasing means) are assembled, the dimension absorbing portion 79 of the lid 74 from the contact surface 46a with the mounting plate 78 of the stator 46. The length in the axial direction is slightly longer than the depth of the stepped portion 78b of the mounting plate 78. When an assembly such as the partition wall 47 is inserted into the lid 74, only the tip of the dimension absorbing portion 79 is selected. It is assembled while deforming, and does not transmit large stress to other parts.
[0065]
For this reason, the lid 74 can be firmly held between the mounting plate 78 and the open end of the partition wall 47 while ensuring the dimensions of the portion where the seal member 58 is inserted, and a large stress is applied to the portion other than the dimension absorbing portion 79 of the lid 74 and the partition wall 47. Therefore, it is possible to realize a shut-off valve having hermeticity and reliability of operation characteristics without deforming the entire lid 74, the second bearing 71 disposed on the lid 74, and the partition wall 47.
[0066]
The valve body 80 includes a valve seat 81 and a valve seat holding member 82, and the convex portion of the valve seat holding member 82 is inserted into the concave portion of the valve body 80. On the rotor 46 side of the valve seat holding member 82, a female screw 82 a that can be screwed with the feed screw 77 and a guide groove 82 b that can be engaged with the pin 75 are formed.
[0067]
In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description. Further, the details of each part are the same as those in the first embodiment, and the description thereof will be omitted.
[0068]
Since the operation of this shut-off valve is substantially the same as that of the first embodiment, detailed description thereof is omitted. Unlike the first embodiment, this shut-off valve is configured such that the valve body 80 and the moving body (female screw 82a) are integrally formed and there is no coil spring. Therefore, in the shut-off operation, the rotor 76 rotates and the valve body 80 It is completed by moving and contacting the valve seat 65, the valve seat 81 being bent, and the rotation of the rotor 76 being stopped. Since this shut-off valve relies on the elastic force of the valve seat 81 to close the valve body when the valve is closed, the valve closing stability is higher than that in the first embodiment in which a stable urging force is provided by the coil spring 66. Although slightly inferior, there is an economic effect because the number of parts can be reduced.
[0069]
As described above, the shutoff valve according to the second embodiment can prevent the seal member 58 from being over-compressed by being compressed in the axial direction, thereby preventing the airtightness from being deteriorated. The lid 74 can be firmly clamped between the mounting plate 78 and the open end of the partition wall 47 while securing the airtightness and operating characteristics without deforming the entire lid 74, the second bearing 71 disposed on the lid 74, and the partition wall 47. It is possible to provide a shut-off valve with high reliability.
[0070]
In FIG. 4, the first bearing 73 and the second bearing 71 are rolling bearings, but may be a sliding bearing, and the second bearing 71 may be formed integrally with the lid 74. Further, although the support plate 72 (biasing means) is made of metal, it may be made of synthetic resin and welded to the stator 46, but may be fitted or engaged with the mounting plate 78. Although the mounting plate 78 and each electromagnetic yoke of the stator 46 and the support plate 72 (biasing means) are fixed to each other by welding, they may be fitted to each other. The biasing means may be held by fitting to the mounting plate 78. Further, the pin 75 as the rotation preventing means may be formed integrally with the second bearing 72.
[0071]
【The invention's effect】
As described above, according to the present invention, a rigid partition wall formed in a pan-like shape without a through hole and a cylindrical step portion that can be attached to a fluid chamber and has an inner diameter slightly larger than the outer diameter of the cylindrical portion of the partition wall are formed. Since the elastic sealing member is disposed between the cylindrical rigid mounting plate and the outer periphery of the cylindrical portion of the partition wall and the inner periphery of the step difference portion of the mounting plate, the compression ratio of the sealing member is a rigid body. This is determined by the outer diameter of the cylindrical portion of the partition wall made of the metal and the inner diameter of the step portion of the mounting plate made of a rigid body, and is hardly affected by minute fluctuations in the axial position of the partition wall and the mounting plate. In addition, if the axial displacement between the partition wall and the mounting plate occurs due to the occurrence of caulking gaps during assembly, or if there is corrosion or thermal expansion during long-term use, the partition wall and the mounting plate Even when the looseness of the sticking occurs, the compression rate of the seal member is hardly affected, and there is an advantageous effect that it is possible to provide a shutoff valve having high reliability with respect to airtightness.
[0072]
In addition, a synthetic resin lid with a bearing at the center is inserted into the open end of the partition wall, and the outer periphery of the cover is held between the open end of the partition wall and the bottom surface of the mounting plate step portion. Since the biasing means biased in the direction of the mounting plate, the bearing on the open end side of the partition can be easily arranged integrally with the lid, and the compression rate of the seal member is not affected by the expansion and contraction of the lid due to temperature change In addition, since the partition wall is energized by the energizing means, the assembly of the partition wall and the mounting plate does not loosen due to the expansion and contraction of the lid due to temperature change, and provides a shut-off valve with higher reliability in terms of airtightness It has an advantageous effect that it can be performed.
[0073]
The biasing means is formed so as to restrict the relative position of the partition wall and the stator in the axial direction, and a protrusion or a circumferential rib that can change the axial position of the lid with respect to the mounting plate by being deformed to the lid clamping portion. When the partition, lid, stator, and biasing means are assembled, the relative position of the partition and the stator in the axial direction is restricted by the biasing means, and protrudes from the stator on the outer periphery of the cylindrical portion of the partition. The length of the portion to be controlled is restricted, and the seal member is prevented from being compressed in the axial direction and being in an overcompressed state, thereby deteriorating the airtightness. In addition, when assembling, the protrusion of the lid clamping part or the rib-shaped dimension absorbing part is selectively deformed by the urging force of the urging means, so that no large stress is applied to other parts of the lid or the partition wall. The lid can be firmly held between the mounting plate and the open end of the bulkhead while maintaining the dimensions of the part where the seal member is inserted, and the entire lid, the bearings placed on the lid, and the bulkhead are not deformed. It has the advantageous effect that a shut-off valve having the characteristics can be provided.
[0074]
In addition, since the backup ring that prevents the seal member from falling off the mounting plate step portion is arranged between the stator and the seal member, the seal member is inserted deeper than the R portion of the corner of the mounting plate cylindrical step portion. In addition, when the assembly of the partition wall and the stator and the mounting plate are assembled, the seal member is wound around the cylindrical stepped portion corner of the mounting plate, or the corner R It has an advantageous effect that it is possible to provide a shut-off valve with higher reliability with respect to airtightness.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a shut-off valve in an opened state according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the shut-off valve during a shut-off operation. 4 is a cross-sectional view of the shut-off valve of the second embodiment of the present invention in the open state. FIG. 5 (a) is a perspective view of the lid when the shut-off valve of the second embodiment of the present invention has a protrusion. Fig. 6 is a perspective view of the lid when the valve has a circumferential rib. Fig. 6 is a sectional view of a conventional shut-off valve in the opened state.
43 Excitation coil 46 Stator 47 Partition walls 57 and 78 Mounting plate 58 Seal member 55 and 76 Rotor 53 Rotating shaft 61 Moving body (valve mechanism)
62, 80 Valve body (valve mechanism)
59 Support frame (biasing means)
72 Support plate (biasing means)
49, 74 Lid 79 Dimension absorption part 60 Backup ring

Claims (4)

励磁コイルを有するステータと、前記ステータの内側に同軸に配設され貫通穴のないなべ状に成形された剛体性の隔壁と、流体室に取り付け可能で前記隔壁の円筒部外径より若干大きな内径の円筒状段差部を形成された剛体性の取り付け板と、前記隔壁の円筒部外周と前記取り付け板段差部内周との間に円周方向に圧縮されて配設された弾性体製のシール部材と、前記隔壁の内側に前記ステータに対向して配設されたロータと、前記ロータの回転軸に配設された弁機構とで構成され
前記隔壁は、開放端につばを有し、前記つばを前記シール部材と共に前記取り付け板段差部に挿入して構成した遮断弁。
A stator having an exciting coil; a rigid partition wall coaxially disposed inside the stator and shaped like a pan without a through hole; and an inner diameter that can be attached to a fluid chamber and is slightly larger than the outer diameter of the cylindrical portion of the partition wall A rigid mounting plate formed with a cylindrical step portion, and an elastic sealing member disposed between the outer periphery of the cylindrical portion of the partition wall and the inner periphery of the mounting plate step portion, being compressed in the circumferential direction. And a rotor disposed inside the partition so as to face the stator, and a valve mechanism disposed on the rotation shaft of the rotor ,
The partition wall has a flange at an open end, and is configured by inserting the collar into the mounting plate step portion together with the seal member .
前記隔壁を取り付け板方向に付勢する付勢手段と、前記隔壁の開放端に嵌挿され中心に軸受を配設した合成樹脂製のふたを有し、前記ふたの外周部を前記つば前記取り付け板段差部の底面とで挟んで保持した請求項1記載の遮断弁。 Said biasing means includes a synthetic resin lid which is disposed a bearing fitted interpolated centered on the open end of the partition wall, the outer peripheral portion of said lid and said flange for urging said bulkhead mounting plate direction The shutoff valve according to claim 1, wherein the shutoff valve is held between the bottom surface of the stepped portion of the mounting plate. 前記付勢手段は前記隔壁と前記ステータの軸方向の相対位置を規制するように形成され、前記隔壁の開放端と前記取り付け板段差部底面とに挟まれるふたの挟持部に、変形することによって前記ふたの前記取り付け板に対する軸方向位置を変えることができる突起もしくは円周リブ状の寸法吸収部を形成した請求項2記載の遮断弁。 Said biasing means being formed so as to regulate the relative axial position of the stator and the partition wall, the clamping portion of the lid which is sandwiched between the open end of the partition wall and the mounting plate step portion bottom surface, by deforming The shut-off valve according to claim 2, wherein a projection or a circumferential rib-shaped dimension absorbing portion capable of changing an axial position of the lid with respect to the mounting plate is formed. 前記ステータと前記シール部材との間に配設され、前記シール部材が前記取り付け板段差部から脱落することを防止するバックアップリングを有する請求項1〜3のいずれか1項に記載の遮断弁。 Wherein disposed between the stator and the seal member, the shut-off valve according to any one of claims 1-3 having a back-up ring of said seal member is prevented from falling off from the mounting plate step portion.
JP37387399A 1999-12-28 1999-12-28 Shut-off valve Expired - Lifetime JP4547751B2 (en)

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JP37387399A JP4547751B2 (en) 1999-12-28 1999-12-28 Shut-off valve

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JP37387399A JP4547751B2 (en) 1999-12-28 1999-12-28 Shut-off valve

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Publication Number Publication Date
JP2001187978A JP2001187978A (en) 2001-07-10
JP4547751B2 true JP4547751B2 (en) 2010-09-22

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JP4701489B2 (en) * 2000-11-15 2011-06-15 パナソニック株式会社 Shut-off valve
JP2004346993A (en) * 2003-05-21 2004-12-09 Matsushita Electric Ind Co Ltd Cutoff valve and its assembling method
JP2005172154A (en) * 2003-12-12 2005-06-30 Matsushita Electric Ind Co Ltd Cut-off valve
JP2006317004A (en) * 2006-06-29 2006-11-24 Matsushita Electric Ind Co Ltd Cut-off valve
CN110513558A (en) * 2018-08-21 2019-11-29 浙江长兴杭华玻璃有限公司 A kind of air delivering pipeline is died automatic switching control equipment

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JPS61109437A (en) * 1984-10-31 1986-05-27 Matsushita Electric Ind Co Ltd Stepping motor
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