JP4158148B2

JP4158148B2 - valve

Info

Publication number: JP4158148B2
Application number: JP2003051419A
Authority: JP
Inventors: 知久武田
Original assignee: Miura Co Ltd
Current assignee: Miura Co Ltd
Priority date: 2003-02-27
Filing date: 2003-02-27
Publication date: 2008-10-01
Anticipated expiration: 2023-02-27
Also published as: JP2004257521A

Description

【０００１】
【発明の属する技術分野】
本発明は、流体を一方向へのみ流すバルブに関するものである。
【０００２】
【従来の技術】
流体の逆流を阻止し、一方向へのみ流す構造のバルブが、逆止弁や真空破壊弁として広く使用されている。これらのバルブは、その構造により各種タイプのものがあり、取り付けられる設備や配管の状況に応じてそれぞれ適したものが選択されて使用される。また、弁座や弁体にあっても、弾性シールといわれる、ゴムなどの弾性材料で形成されたものや、メタルシールといわれる、金属などの非弾性材料で形成されたものがある。
【０００３】
前記のような弁座や弁体によるシールが弾性シールである場合、シール性はよいが、耐圧性が低く、また耐久性に欠けるといった問題があり、一方、メタルシールである場合、耐圧性、耐久性は高いが、小さなゴミが弁座と弁体との間に挟まる、所謂ゴミ噛みにより、簡単にシール性が損なわれ逆流が起こり易いといった問題や、また、弁の閉止時の衝撃も大きく、騒音の問題もあった。
【０００４】
そこで、これらの問題点を解決するバルブとして、内部に備えた弁室の片側に流入通路が形成され他側に流出通路が形成された弁ハウジングの、弁室の流入通路側に、弁口を開口している弁座を設け、弁室内には、流入通路口に支持されたガイドと流出通路口に支持されたガイドに摺動自在に支持された軸が渡され、この軸にゴムの如き弾性材料からなる第１の弁体部と、金属の如き硬質材料からなる第２の弁体部とで構成されている弁体が固定され、そして、弁座にあっては、第１の弁体部と当接する第１の弁座部と、第２の弁体部と当接する第２の弁座部とで構成されており、流出通路から流入通路への流体の逆流時に、先ず、第１の弁体部が第１の弁座部に当接し、ついで第２の弁体部が第２の弁座部に当接するようにしたバルブが提案されている（例えば、特許文献１参照。）。
【０００５】
かかるバルブによれば、ゴムの如き弾性材料からなる第１の弁体部により、ゴミ噛みがあってもシールの確実性を確保し、そして騒音の問題を解決し、金属の如き硬質材料からなる第２の弁体部により、耐圧性と耐久性を確保することができる。
【０００６】
【特許文献１】
特開２００１−３４９４５４号公報
【０００７】
【発明が解決しようとする課題】
しかしながら、前記のようなガイドに摺動自在に支持された軸に固定された、ゴムの如き弾性材料からなる第１の弁体部と、金属の如き硬質材料からなる第２の弁体部とで構成されている弁体を持つバルブによれば、弁体が固定されている軸を摺動自在に支持するガイドが抵抗となって流体の流れの障害となり、また、弁体が固定されている軸と、この軸を摺動自在に支持するガイドとの間の摺動抵抗が弁体の移動の妨げとなり、例えば真空破壊弁として使用したとき真空破壊圧の安定性を欠くことになるおそれがある、といった問題がある。
【０００８】
本発明の目的は、シールの確実性、耐圧性、耐久性を確保し、そして騒音の問題を解決し、更に、部品点数を少なくして製造を容易にし、コストの低減を図ることができるバルブを提供することにある。
本発明の他の目的は、流体の抵抗が少なく流れをよくすることができるバルブを提供することにある。
本発明の他の目的は、弁体の移動抵抗を少なくすることができるバルブを提供することにある。
【０００９】
【課題を解決するための手段】
上記の目的を達成するために、請求項１に記載の発明は、内部に備えた弁室の片側に流入通路が形成され他側に流出通路が形成された弁ハウジングの、前記弁室の流入通路側に、弁口を開口している弁座を有し、前記弁室内には、前記流入通路から前記流出通路への流体圧を受けたとき、前記弁座から離れる側へ移動して前記弁口を開放し、前記流出通路から前記流入通路への流体圧を受けたとき、前記弁座方向へ移動し、前記弁座と当接して前記弁口を閉鎖する弁体を備え、前記弁座は、弾性材料で形成された第１弁座部と非弾性材料で形成された第２弁座部とで構成され、前記弁体が弁座方向へ移動したとき、前記弁体が先ず前記第１弁座部と当接し、ついで前記第１弁座部との当接状態を保ったまま、前記第１弁座部の弾性変形を得て前記第２弁座部と当接するように構成されているバルブにおいて、前記第２弁座部は、中央に弁口を開口し、この弁口の周囲を第２当接座面とし、前記第１弁座部は、前記第２当接座面の外周に、前記第２当接座面より先に前記弁体と接触するように、前記弁室内へ突出する環状突部を有し、この環状突部の先端に第１当接座面が形成されており、前記第１当接座面は、前記弁体が前記流入通路側へ移動する方向へ向かって漸次小径となる凹型テーパ状に形成され、前記第２当接座面は、前記弁体が前記流入通路側へ移動する方向と直交する平面状に形成されており、さらに前記弁体は、前記第１当接座面と概ね対応する凸型テーパ状に形成され、前記第１弁座部と当接する第１当接面と、前記第２当接座面と対応する平面状に形成され、前記第２弁座部と当接する第２当接面とを有していることを特徴とする。
【００１０】
かかる構成から、流出通路から流入通路への流体の逆流時に、弁体が弁座方向へ移動したとき、弁体が先ず弾性材料で形成された第１弁座部と当接し、ついで第１弁座部との当接状態を保ったまま第１弁座部の弾性変形を得て非弾性材料で形成された第２弁座部と当接するので、弾性材料で形成された第１弁座部との当接により、ゴミ噛みがあってもシールの確実性を確保し、そして弁体は、第１弁座部の当接による衝撃が第１弁座部の弾性変形により緩衝され、この後第２弁座部と当接するので、衝撃による騒音の発生が防止され、さらに、非弾性材料で形成された第２弁座部との当接により、耐圧性と耐久性が確保できる。また、構成が簡単で、部品点数が少なくてすむので、製造が容易となりコストの低減が図れる。
【００１１】
また、前記第２弁座部は、中央に弁口を開口し、この弁口の周囲を第２当接座面とし、前記第１弁座部は、前記第２当接座面の外周に、前記第２当接座面より先に前記弁体と接触するように、前記弁室内へ突出する環状突部を有し、この環状突部の先端に第１当接座面が形成されているので、流出通路から流入通路への流体の逆流時に、弁体が弁座方向へ移動したとき、弁体が第２弁座部の第２当接座面より先に第１弁座部の第１当接座面と当接するので、弁体が第１弁座部と当接したときの第１弁座部の弾性変形を確実に得ることができる。
また、前記第１当接座面は、前記弁体が前記流入通路側へ移動する方向へ向かって漸次小径となる凹型テーパ状に形成され、前記第２当接座面は、前記弁体が前記流入通路側へ移動する方向と直交する平面状に形成されており、さらに、前記弁体は、前記第１当接座面と概ね対応する凸型テーパ状に形成され、前記第１弁座部と当接する第１当接面と、前記第２当接座面と対応する平面状に形成され、前記第２弁座部と当接する第２当接面とを有しているので、流出通路から流入通路への流体の逆流時に、弁体が弁座方向へ移動し、弁体の凸型テーパ状に形成された第１当接面が第１当接座面と当接したとき、第１当接座面が第１当接面によって外周方向へ押し広げられ、この復元力によって弁体の第１当接面と第１当接座面との密着性が増し、シール性が向上する。そして、第２当接座面は、弁体が流入通路側へ移動する方向と直交する平面状に形成されており、弁体には第２当接座面と対応する平面状に形成された第２当接面を有しているので、この第２当接座面が移動してくる弁体の第２当接面を確実に受けることができ、前記弾性材料で形成された第１弁座部の必要以上の変形を防止できるので、耐圧性と耐久性の向上を図ることができる。
請求項２に記載の発明は、請求項１に記載の、前記弁体は、胴部を有し、この胴部の側面は、移動方向の前後を小径とする凸曲面に形成されていることを特徴とする。
【００１２】
かかる構成から、弁室の内壁と接触する弁体の胴部は点接触となり、弁体の移動抵抗が少なく、また、移動に引っかかりが生じないので、弁体の円滑で安定した移動が得られる。
【００１３】
請求項３に記載の発明は、請求項１または２のいずれかに記載の、前記弁室には前記弁座から離れる側へ移動する弁体を当接させそれ以上の移動を阻止する壁が形成されており、前記弁体には、前記弁座に開口する弁口と遊嵌合する嵌合突起が形成され、この嵌合突起は、前記弁体が前記壁と当接するまでの移動があってもその先端の一部が前記弁口内に止まる長さに形成されていることを特徴とする。
【００１４】
かかる構成から、弁体に形成された嵌合突起は弁座に開口する弁口内にあり外れないので、弁室内において弁体を軸等で支持しなくても、弁体が弁座方向へ移動したとき、弁体が弁座と確実に当接して弁口を閉鎖することができる。
【００１５】
請求項４に記載の発明は、請求項１，２または３のいずれかに記載の、前記弁ハウジングには、前記弁体を前記弁座方向へ付勢するスプリングが設けられていることを特徴とする。
【００１６】
かかる構成から、流入通路側から流出通路側へ流体が流れていないときは、弁体がスプリングに付勢されて弁座と当接し、弁座に開口する弁口が閉鎖された状態にあるので、逆止弁としてだけでなく、真空破壊弁としても使用することができる。
【００１７】
請求項５に記載の発明は、請求項１，２，３または４のいずれかに記載の、前記第２弁座部はその外周が前記弁ハウジングの前記流入通路に螺合して取り付けられていることを特徴とする。
【００１８】
かかる構成から、構成が一層簡単になり、部品点数が少なくてすむので、製造が容易となり一層のコスト低減が図れる。
【００１９】
【発明の実施の形態】
図１乃至図３は本発明に係るバルブの実施の形態の一例を示したもので、図１はバルブの流路が開いている状態を示す縦断面図、図２、図３は流出通路から流入通路への流体の逆流時における弁体と弁座との当接過程を示す縦断面図である。
【００２０】
本例のバルブは、内部に備えた弁室１の片側に流入通路２が形成され、他側に流出通路３が形成された筒状の弁ハウジング４の、弁室１の流入通路２側に、弁口５を開口している弁座６を有し、弁室１内には、流入通路２から流出通路３への流体圧を受けたとき、弁座６から離れる側へ移動して弁口５を開放し、流出通路３から流入通路２への流体圧を受けたとき、弁座６方向へ移動し、弁座６と当接して弁口５を閉鎖する弁体７を備えている。
【００２１】
弁ハウジング４の流入通路２内周面には流入側配管に螺合する雌ねじ８が形成され、また、弁ハウジング４の流出通路３を形成する筒部の外周面には、流出側配管に螺合する雄ねじ９が形成されている。
【００２２】
弁座６は、ゴムなどの弾性材料で形成された第１弁座部１０と金属などの非弾性材料で形成された第２弁座部１１とからなり、弁体７が弁座６方向へ移動したとき、弁体７が先ず第１弁座部１０と当接し、ついで第１弁座部１０との当接状態を保ったまま、第１弁座部１０の弾性変形を得て第２弁座部１１と当接するように構成されている。
【００２３】
さらに詳細には、弁座６を構成する第２弁座部１１は、中央に弁口５を開口する流路孔１３が形成され、弁口５の周囲を第２当接座面１２とし、この第２当接座面１２は、弁体７が流入通路２側へ移動する方向と直交する平面状に形成されている。また、第１弁座部１０は、第２当接座面１２の外周に、この第２当接座面１２より先に弁体７と接触するように弁室１内へ突出する環状突部１４を有し、この環状突部１４の先端に第１当接座面１５が形成されている。この第１当接座面１５は、弁体７が流入通路２側へ移動する方向へ向かって漸次小径となる凹型テーパ状に形成されている。
【００２４】
本例では、弁座６を構成する第２弁座部１１は、弁ハウジング４の流入通路２内周面に形成された雌ねじ８と螺合可能な雄ねじ１６が形成された基体１７と、この基体１７の弁室１側へ突出して弁口５を形成する筒部１８により構成されている。また、第１弁座部１０は、中央に筒部１８の外周に嵌合可能な孔１９を有する円板状基体２０の一側面に、環状突部１４が形成された構成となっている。そして、第１弁座部１０を構成する円板状基体２０を、第２弁座部１１を構成する基体１７に形成されている筒部１８の外周に嵌合して、第１弁座部１０と第２弁座部１１とが一体に保持されている。
【００２５】
このように構成された弁座６の弁ハウジング４への取り付けにあっては、第１弁座部１０を弁室１側へ向けて第２弁座部１１を構成する基体１７を、弁ハウジング４の流入通路２内周面に形成された流入側配管と螺合する雌ねじ８を利用して、この雌ねじ８と螺合することにより取り付けられる。このとき、弁室１は流入通路２よりも小径に形成されており、第１弁座部１０を構成する円板状基体２０の外周部が、流入通路２と弁室１との間に形成される段部２１と第２弁座部１１を構成する基体１７の流出通路３側の端面で締め付けられるようになっている。これにより、第１弁座部１０を構成する円板状基体２０は、弁座６と弁ハウジング４との間をシールするシール部材としての機能も果たすことになる。さらに、弁座６と弁ハウジング４との間にはシールリング２２が装着されている。
【００２６】
また、前記のように構成された弁座６に当接する弁体７にあっては、移動方向に所定の長さを有する胴部２３を有し、この胴部２３の弁座６との当接面側に、第１弁座部１０の凹型テーパ状に形成された第１当接座面１５に概ね対応する凸型テーパ状に形成された第１当接面２４と、第２弁座部１１の平面状に形成された第２当接座面１２に対応する平面状に形成された第２当接面２５を有しており、第１当接面２４が第１当接座面１５と、第２当接面２５が第２当接座面１２と当接するようになっている。
【００２７】
また、弁体７を構成する胴部２３は、弁室１の内径より若干小径に形成されており、そして、その側面２６は、移動方向の前後を小径とする凸曲面に形成されており、この胴部２３はその側面２６が弁室１の内壁に点接触により支持されるようになっている。さらに、胴部２３には、弁室１内で流入通路２側と流出通路３側を連通する連通溝２７が円周方向の複数箇所に設けられている。
【００２８】
また、弁体７を移動可能に収容する弁室１には、弁座６から離れる側へ移動する弁体７を当接させそれ以上の移動を阻止する壁２８が形成されている。弁体７を構成する胴部２３の移動方向の長さは、弁室１との関係において、弁体７が弁座６から離れる側へ移動して壁２８と当接したとき、離反した弁体７と弁座６との間に流体の流れに必要な空間が確保できる長さに設定されている。
【００２９】
さらに、弁室１に備えられた弁体７には、弁座６との当接面側に、弁座６に開口する弁口５と遊嵌合する嵌合突起２９が形成され、この嵌合突起２９は、弁体７が弁室１の壁２８と当接するまでの移動があってもその先端の一部が弁口５内に止まる長さに形成されている。また、嵌合突起２９は基部を弁口５の内径と概ね同径とし、先端に向かって漸次小径としたテーパ状のガイド面３０が形成されており、弁体７が弁座６方向へ移動したとき、弁口５内を奥部に移動する嵌合突起２９のガイド面３０にガイドされて、弁体７の第１当接面２４が弁座６の第１弁座部１０の第１当接座面１５と、第２当接面２５が弁座６の第２弁座部１１の第２当接座面１２と確実に当接するようになっている。
【００３０】
また、弁ハウジング４内には、流出通路３と弁室１との間に、弁体７を弁座６方向へ付勢するスプリング３１が設けられている。このスプリング３１の弾発力は、弁体７を弁座６と当接した状態を保持できる程度の弱い弾発力でよいが、特に限定されるものではなく、用途によって適宜選択される。このスプリング３１にあっては、例えば、本発明に係るバルブを逆止弁として使用する場合は、必ずしも必要とされるものではないが、真空破壊弁として使用する場合は、必須の構成となる。
【００３１】
以上のように構成されたバルブは、流入通路２から流出通路３への流体の流れがあったとき、弁体７が流体に押されて弁座６から離反する方向へ移動して弁口５を開き、流体が流入通路２から流出通路３へ流れる。反対に、流体が流出通路３から流入通路２へ逆流したとき、この逆流した流体に弁体７が押されて弁座６方向へ移動し、弁体７の第１当接面２４が先ず弾性材料で形成された第１弁座部１０の第１当接座面１５と当接し、ついで第１当接面２４と第１当接座面１５との当接状態を保ったまま第１弁座部１０の弾性変形を得て弁体７の第２当接面２５が第２弁座部１１の第２当接座面１２と当接する。このとき、弁体７の第１当接面２４が当接する第１当接座面１５は、環状突部１４の先端に形成されているので、弁体７が第１弁座部１０に当接したときの第１弁座部１０の弾性変形を確実に得ることができるものとなる。
【００３２】
そして、弁体７の第１当接面２４と第１当接座面１５との当接にあっては、第１当接座面１５が流入通路２側へ向かって漸次小径となる凹型テーパ状に形成され、また、弁体７の第１当接面２４は、第１当接座面１５に概ね対応する凸型テーパ状に形成されているので、第１当接面２４が第１当接座面１５に当接したとき、凹型テーパ状に形成された第１当接座面１５が凸型テーパ状に形成された第１当接面２４によって外周方向へ押し広げられ、この復元力によって弁体７の第１当接面２４と第１当接座面１５との密着性が増し、シール性が向上し、第１当接面２４と第１当接座面１５との間にゴミ噛みがあってもシールの確実性を確保し流体漏れを確実に防止できる。
【００３３】
そして、弁体７は、第１弁座部１０の当接による衝撃が第１弁座部１０の弾性変形により緩衝され、この後第２弁座部１１に当接するので、衝撃による騒音の発生が防止される。
【００３４】
また、弁体７の第２当接面２５と第２弁座部１１の第２当接座面１２との当接にあっては、第２当接座面１２が弁体７の移動する方向と直交する平面状に形成され、また、弁体７の第２当接面２５は、第２当接座面１２に対応する平面状に形成されているので、第２当接座面１２が移動してくる弁体７の第２当接面２５を確実に受けることができ、弾性材料で形成された第１弁座部１０の必要以上の変形を防止できるので、耐圧性と耐久性の向上を図ることができる。
【００３５】
また、本例では、弁体７にあっては、移動方向に所定の長さを有する胴部２３を有し、この胴部２３は、弁室１の内径より若干小径に形成されており、そして、その側面２６は、移動方向の前後を小径とする凸曲面に形成されており、この胴部２３はその側面２６が弁室１の内壁に点接触により支持されるようになっているので、弁体７の移動抵抗が少なく、また、移動に引っかかりが生じないので、弁体７に円滑で安定した移動が得られ、特に、真空破壊弁として使用したときには、真空破壊圧が安定する。
【００３６】
また、本例では、弁体７を移動可能に収容する弁室１には、弁座６から離れる側へ移動する弁体７を当接させそれ以上の移動を阻止する壁２８が形成されており、弁室１に備えられた弁体７には、弁座６との当接面側に、弁座６に開口する弁口５と遊嵌合する嵌合突起２９が形成され、この嵌合突起２９は、弁体７が弁室１の壁２８と当接するまでの移動があっても、その先端の一部が弁口５内に止まる長さに形成されているので、弁体７に形成された嵌合突起２９が常に弁座６に開口する弁口５内にあり外れないので、弁室１内において弁体７を軸等で支持しなくても、弁体７が弁座６方向へ移動したとき、弁体７が弁座６と確実に当接して弁口５を閉鎖することができる。また、前記のように、弁体７を支持する軸等の必要がないので、その分摩擦による移動抵抗が無く、真空破壊弁として使用したときの真空破壊圧の一層の安定を図ることができ、また、流体の抵抗が少なく良好な流れを得ることができる。
【００３７】
また、嵌合突起２９には基部を弁口５の内径と概ね同径とし、先端に向かって漸次小径としたテーパ状のガイド面３０が形成され、弁体７が弁座６方向に移動したとき、弁口５内を奥部へ移動する嵌合突起２９のガイド面３０にガイドされて、弁体７の第１当接面２４が弁座６の第１弁座部１０の第１当接座面１５と、第２当接面２５が弁座６の第２弁座部１１の第２当接座面１２と確実に当接するようになっているので、弁体７の円滑な移動とシールの完全性が得られる。
【００３８】
さらには、本発明に係るバルブは、前記の通り部品点数が少なく、また、弁座６の弁ハウジング４への取り付けは、第１弁座部１０を弁室１側へ向けて第２弁座部１１を構成する基体１７を、弁ハウジング４の流入通路２内周面に形成された流入側配管と螺合する雌ねじ８を利用して、この雌ねじ８と螺合することにより取り付けているので、雌ねじ８が流入側配管の接続と第２弁座部１１を構成する基体１７の螺合を兼用することになり、これにより部品点数を少なくできるだけでなく、製造が容易となりコストの低減が図れる。
【００３９】
【発明の効果】
以上のように本発明に係るバルブによれば、シールの確実性、耐圧性、耐久性を確保し、そして騒音の問題を解決し、さらに、部品点数を少なくして製造を容易にコストの低減を図ることができ、また、弁体の移動抵抗を少なくすることができるので、特に、真空破壊弁として使用したときには、安定した真空破壊圧が得られる。
【図面の簡単な説明】
【図１】本発明に係るバルブの実施の形態の一例で、流体が順方向に流れているときの流路が開いている状態を示す縦断面図である。
【図２】流出通路から流入通路への流体の逆流時における弁体と弁座との当接過程を示す縦断面図である。
【図３】流出通路から流入通路への流体の逆流時における弁体と弁座との当接過程を示す縦断面図である。
【符号の説明】
１弁室
２流入通路
３流出通路
４弁ハウジング
５弁口
６弁座
７弁体
１０第１弁座部
１１第２弁座部
１２第２当接座面
１４環状突部
１５第１当接座面
２３胴部
２４第１当接面
２５第２当接面
２８壁
２９嵌合突起
３１スプリング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve that allows fluid to flow only in one direction.
[0002]
[Prior art]
Prevents the backflow of fluid, the valve structure to flow only in one direction have been widely used as a check valve and vacuum breaker. There are various types of these valves depending on their structures, and appropriate valves are selected and used according to the conditions of the equipment and piping to be attached. Further, even in the valve seat and the valve body, there are those formed of an elastic material such as rubber called an elastic seal and those formed of an inelastic material such as metal called a metal seal.
[0003]
When the seal by the valve seat or the valve body is an elastic seal, the sealing performance is good, but the pressure resistance is low, and there is a problem that the durability is lacking. Durability is high, but small dust is caught between the valve seat and the valve body, so that the so-called dust biting easily impairs the sealing performance and easily causes back flow, and the impact when closing the valve is also large. There was also a problem of noise.
[0004]
Therefore, as a valve for solving these problems, a valve port is provided on the inflow passage side of the valve chamber of the valve housing in which the inflow passage is formed on one side of the valve chamber provided inside and the outflow passage is formed on the other side. An open valve seat is provided, and in the valve chamber, a guide supported by the inflow passage port and a shaft slidably supported by the guide supported by the outflow passage port are passed. A valve body composed of a first valve body portion made of an elastic material and a second valve body portion made of a hard material such as metal is fixed, and in the valve seat , the first valve body portion is fixed. The first valve seat portion is in contact with the body portion and the second valve seat portion is in contact with the second valve body portion. When the fluid flows backward from the outflow passage to the inflow passage, first , the valve body 1 is in contact with the first valve seat portion, one second valve body in the stomach was made to abut against the second valve seat valve Hisage Is (e.g., see Patent Document 1.).
[0005]
According to such a valve, the first valve body portion made of an elastic material such as rubber ensures the reliability of the seal even if there is a bite of dust, solves the problem of noise, and is made of a hard material such as metal. With the second valve body portion, pressure resistance and durability can be ensured.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-349454
[Problems to be solved by the invention]
However, a first valve body portion made of an elastic material such as rubber, and a second valve body portion made of a hard material such as metal, which are fixed to a shaft slidably supported by the guide as described above. According to the valve having a valve body constituted by the above , the guide that slidably supports the shaft on which the valve body is fixed becomes a resistance and obstructs the flow of fluid, and the valve body is fixed. The sliding resistance between the shaft that is slidably supported and the guide that slidably supports the shaft may hinder the movement of the valve body, and for example, when used as a vacuum breaking valve, the stability of the vacuum breaking pressure may be lost. There is a problem that there is.
[0008]
An object of the present invention is a valve capable of ensuring the reliability, pressure resistance, and durability of a seal, solving the problem of noise, facilitating manufacture by reducing the number of parts, and reducing the cost. Is to provide.
Another object of the present invention is to provide a valve that can improve flow with less fluid resistance.
Another object of the present invention is to provide a valve that can reduce the movement resistance of the valve body.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is directed to an inflow of the valve chamber of a valve housing in which an inflow passage is formed on one side of the valve chamber provided therein and an outflow passage is formed on the other side. aisle, has a valve seat that opens the valve port, the valve in the chamber, when from the inlet passage receiving the fluid pressure to the outlet passage, and moves to the side away from the valve seat the valve port and an open, when subjected to fluid pressure to the inlet passage from the outlet passage, and moves to the valve seat direction, the valve seat and abuts with the valve member to close the valve port, the valve seat is constituted by a second valve seat portion formed of an inelastic material and first valve seat portion formed of an elastic material, when the valve body is moved to the valve seat direction, the valve body is first the first valve seat portion and the contact, and then while maintaining the contact between the first valve seat portion, with the elastic deformation of the first valve seat portion In the valve that is configured to serial and second valve seat portions abuts, the second valve seat portion, a valve port open to the center, the periphery of the valve opening and the second contact seat, said first The one valve seat portion has an annular protrusion that protrudes into the valve chamber on the outer periphery of the second contact seat surface so as to come into contact with the valve body before the second contact seat surface. A first abutment seat surface is formed at the tip of the annular protrusion, and the first abutment seat surface has a concave taper shape that gradually decreases in diameter in a direction in which the valve body moves toward the inflow passage. The second abutment seat surface is formed in a planar shape orthogonal to the direction in which the valve body moves toward the inflow passage, and the valve body is substantially in contact with the first abutment seat surface. A corresponding convex tapered shape is formed, a first contact surface that contacts the first valve seat portion, and a flat surface corresponding to the second contact seat surface. Characterized in that a second abutment surface that abuts the second valve seat portion.
[0010]
From this configuration, when reverse flow of fluid from the outlet passage to the inlet passage, when the valve body is moved to the valve seat direction, the valve element is firstly the first valve seat portion and a contact formed of an elastic material, one had at first since the second valve seat portion formed of an inelastic material to obtain an elastic deformation of the first valve seat portion while maintaining the contact state abuts the valve seat portion, a first valve seat formed of an elastic material With the contact with the part, the reliability of the seal is ensured even if there is a bite of dust, and the impact of the contact with the first valve seat part is buffered by the elastic deformation of the first valve seat part. since the second valve seat portion and the abutment post, generation of noise due to impact is prevented, in addition, by the contact between the second valve seat portion formed of an inelastic material, pressure resistance and durability can be ensured. In addition, since the configuration is simple and the number of parts is small, manufacturing is facilitated and costs can be reduced.
[0011]
Further, the second valve seat portion has a valve opening in the center, and the periphery of the valve mouth serves as a second contact seat surface, and the first valve seat portion is formed on an outer periphery of the second contact seat surface. And an annular protrusion protruding into the valve chamber so as to come into contact with the valve body prior to the second contact seat surface, and a first contact seat surface is formed at a tip of the annular protrusion. Therefore, when the valve body moves in the valve seat direction during the backflow of the fluid from the outflow passage to the inflow passage, the valve body is moved to the first valve seat portion before the second contact seat surface of the second valve seat portion. Since it contacts the first contact seat surface, it is possible to reliably obtain the elastic deformation of the first valve seat portion when the valve body contacts the first valve seat portion.
The first abutting seat surface is formed in a concave taper shape having a gradually decreasing diameter in a direction in which the valve body moves toward the inflow passage, and the second abutting seat surface is formed by the valve body. The valve body is formed in a planar shape orthogonal to the direction of movement toward the inflow passage side, and the valve body is formed in a convex taper shape substantially corresponding to the first contact seat surface, and the first valve seat A first abutting surface that abuts against the portion and a second abutting surface that is formed in a flat shape corresponding to the second abutting seat surface and abuts against the second valve seat portion. When the fluid flows back from the passage to the inflow passage, the valve body moves in the valve seat direction, and when the first contact surface formed in the convex taper shape of the valve body contacts the first contact seat surface, The first abutment seat surface is spread outwardly by the first abutment surface, and this restoring force increases the adhesion between the first abutment surface of the valve body and the first abutment seat surface. , To improve the sealing properties. The second contact seat surface is formed in a planar shape orthogonal to the direction in which the valve body moves toward the inflow passage, and the valve body is formed in a planar shape corresponding to the second contact seat surface. Since the second abutment surface is provided, the second abutment surface of the valve body to which the second abutment seat surface moves can be reliably received, and the first valve made of the elastic material is used. Since the seat portion can be prevented from being deformed more than necessary, pressure resistance and durability can be improved.
According to a second aspect of the invention, according to claim 1, wherein the valve body has a body portion, the side surface of the barrel, that are formed before and after the moving direction to the convex curved surface with small diameter It is characterized by.
[0012]
With this configuration, the body of the valve body that comes into contact with the inner wall of the valve chamber is in point contact, and there is little movement resistance of the valve body, and there is no catching in movement, so that smooth and stable movement of the valve body is obtained. .
[0013]
The invention according to claim 3, according to claim 1 or 2, in the valve chamber wall to prevent movement of more abut the valve body to move to the side away from the valve seat is formed, the valve body, fitting projections of the valve port and loosely if the opening is formed in the valve seat, the fitting projection, the movement to the valve body comes into contact with the wall Even if it exists, the part of the front-end | tip is formed in the length which stops in the said valve opening, It is characterized by the above-mentioned.
[0014]
Move from such a configuration, since the fitting projection formed on the valve body does not come off is in a valve port that opens to the valve seat, without supporting the valve body in the axial or the like in the valve chamber, the valve body to the valve seat direction when can the valve body closes the valve port reliably contacts the valve seat.
[0015]
Invention according to claim 4, characterized in that according to any one of claims 1, 2 or 3, the valve housing, a spring that urges the valve body to the valve seat direction is provided And
[0016]
From this configuration, when the fluid is not flowing from the inflow passage side to the outflow passage side, the valve body is urged by the spring and comes into contact with the valve seat, and the valve port that opens to the valve seat is closed. It can be used not only as a check valve but also as a vacuum breaking valve.
[0017]
According to a fifth aspect of the present invention, the outer periphery of the second valve seat portion according to any one of the first , second, third, or fourth aspect is screwed and attached to the inflow passage of the valve housing. It is characterized by being.
[0018]
With this configuration, the configuration is further simplified and the number of parts can be reduced, so that the manufacture is facilitated and the cost can be further reduced.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an example of an embodiment of a valve according to the present invention. FIG. 1 is a longitudinal sectional view showing a state in which a flow path of the valve is open, and FIGS. 2 and 3 are views from an outflow passage. It is a longitudinal cross-sectional view which shows the contact process of a valve body and a valve seat at the time of the backflow of the fluid to an inflow passage.
[0020]
In the valve of this example, an inflow passage 2 is formed on one side of a valve chamber 1 provided inside, and a tubular valve housing 4 in which an outflow passage 3 is formed on the other side, on the inflow passage 2 side of the valve chamber 1. , a valve seat 6 which opens a valve port 5, the valve chamber 1, when subjected to fluid pressure to the inflow passage 2 or et flow out passage 3, move to the side away from the valve seat 6 and opening the valve port 5, when subjected to fluid pressure to flow out passage 3 or et influx passage 2, to move the valve seat 6 direction to close the valve port 5 in contact with the valve seat 6 equivalents valve A body 7 is provided.
[0021]
A female screw 8 is formed on the inner peripheral surface of the inflow passage 2 of the valve housing 4 to be screwed to the inflow side piping. Further, the outer peripheral surface of the cylindrical portion forming the outflow passage 3 of the valve housing 4 is screwed to the outflow side piping. A mating male screw 9 is formed.
[0022]
The valve seat 6 comprises a first valve seat portion 10 and the second valve seat portion 11 for formed of an inelastic material such as metal which is formed of an elastic material such as rubber, the valve body 7 to the valve seat 6 direction when it moves, while maintaining the contact between the first valve seat portion 10 the valve body 7 is first the first valve seat portion 10 in contact, one had, the obtained elastic deformation of the first valve seat portion 10 a second valve seat portion 11 is configured to abut.
[0023]
In particular the further, second valve seat portion 11 of the valve seat 6, the flow path hole 13 which opens the valve port 5 in the center is formed, the periphery of the valve opening 5 and the second contact seat 12 the second contact seat 12 is formed in a planar shape perpendicular to the direction in which the valve body 7 moves to the inlet passage 2 side. The first valve seat 10, second on the outer circumference of the abutment seating surface 12, an annular projection which projects the second contact seat 12 from above into the valve chamber 1 to contact the valve body 7 has 14, first abutment seating surface 15 is formed at the tip of the annular projection 14. The first contact seat 15 This is formed in a concave tapered to be gradually small toward the direction in which the valve body 7 moves to the inlet passage 2 side.
[0024]
In this example, the second valve seat portion 11 of the valve seat 6 includes a base 17 which internal thread 8 and screwable male thread 16 formed in the inflow passage 2 inner circumferential surface of the valve housing 4 is formed, this It is constituted by the cylindrical portion 18 to form a valve port 5 projects into the valve chamber 1 side of the substrate 17. The first valve seat portion 10, on one side surface of the disc-shaped body 20 having a fittable hole 19 in the outer periphery of the cylindrical portion 18 in the center, has a configuration in which the ring-shaped projection 14 is formed . Then, the disk-shaped substrate 20 constituting the first valve seat portion 10, fitted to the outer periphery of the cylindrical portion 18 formed on the base body 17 that make up the second valve seat portion 11, the first valve a seat 10 and a second valve seat portion 11 are held together.
[0025]
In mounting the valve seat 6 configured in this way to the valve housing 4, the base body 17 constituting the second valve seat portion 11 with the first valve seat portion 10 facing the valve chamber 1 side is used as the valve housing. utilizing the fourth inlet channel 2 inside internal thread 8 engaged with the formed inlet pipe on the peripheral surface, it is mounted by screwing a female screw 8. At this time , the valve chamber 1 is formed to have a smaller diameter than the inflow passage 2, and the outer peripheral portion of the disc-shaped base 20 constituting the first valve seat portion 10 is formed between the inflow passage 2 and the valve chamber 1. The base portion 17 constituting the stepped portion 21 and the second valve seat portion 11 is tightened at the end face on the outflow passage 3 side . As a result , the disc-shaped base body 20 constituting the first valve seat portion 10 also functions as a seal member that seals between the valve seat 6 and the valve housing 4. In addition, the seal ring 22 is mounted between the valve seat 6 and the valve housing 4.
[0026]
Further, the valve body 7 that contacts the valve seat 6 configured as described above has a body portion 23 having a predetermined length in the moving direction, and this body portion 23 is in contact with the valve seat 6. A first contact surface 24 formed in a convex taper shape substantially corresponding to the first contact seat surface 15 formed in a concave taper shape of the first valve seat portion 10 on the contact surface side, and a second valve seat The second contact surface 25 is formed in a planar shape corresponding to the second contact seat surface 12 formed in the planar shape of the portion 11, and the first contact surface 24 is the first contact seat surface. 15 and the second contact surface 25 come into contact with the second contact seat surface 12.
[0027]
Further, body portion 23 of the valve body 7 is formed in a smaller diameter slightly than the inner diameter of the valve chamber 1 and the side surface 26 is formed before and after the moving direction to the convex curved surface with small diameter, A side surface 26 of the body portion 23 is supported on the inner wall of the valve chamber 1 by point contact. In addition, the body portion 23, communicating groove 27 for communicating with the inflow passage 2 side outflow passage 3 side within the valve chamber 1 is provided in a plurality of positions in the circumferential direction.
[0028]
Further, the valve chamber 1 which movably accommodates a valve body 7, the wall 28 to prevent movement of more abut the valve body 7 to move to the side away from the valve seat 6 is formed. The moving direction of the length of the body portion 23 of the valve body 7 is in relation to the valve chamber 1, when the valve body 7 is in contact with the wall 28 moves to the side away from the valve seat 6 equivalents, separated by a valve The length is set such that a space necessary for fluid flow can be secured between the body 7 and the valve seat 6.
[0029]
Furthermore, the valve body 7 provided in the valve chamber 1, the contact surface of the valve seat 6, the fitting projection 29 loosely fitting engagement with valve port 5 which opens into the valve seat 6 are formed, the fitting protrusion 29, the valve body 7 is also part of the tip there moved to abut the wall 28 of the valve chamber 1 is formed in a length that remains in the valve outlet 5. Further, fitting protrusions 29 is roughly the same diameter of the base portion and the inner diameter of the valve port 5, moves toward the distal end gradually have tapered guide surfaces 30 that a smaller diameter is formed, the valve body 7 to the valve seat 6 direction when, being guided in the valve port 5 on the guide surface 30 of the fitting protrusions 29 fitted you move to the inner part, the first abutment surface 24 of the valve body 7 is in the first valve seat portion 10 of the valve seat 6 a The first abutment seat surface 15 and the second abutment surface 25 are configured to reliably abut on the second abutment seat surface 12 of the second valve seat portion 11 of the valve seat 6.
[0030]
Also, the valve housing 4, between the outlet passage 3 and the valve chamber 1, a spring 31 for urging the valve body 7 to the valve seat 6 direction. The elastic force of the spring 31, may be a weak elastic force of enough to hold in contact with each other when the valve body 7 and the valve seat 6 equivalents, is not particularly limited and is appropriately selected depending on the application. The spring 31 is not necessarily required when, for example, the valve according to the present invention is used as a check valve, but is essential when used as a vacuum breaking valve.
[0031]
It is configured valve as described above, when a flow of fluid from the inflow passage 2 into the outflow passage 3, the valve port 5 moves in the direction of the valve body 7 separates from the valve seat 6 is pushed by the fluid The fluid flows from the inflow passage 2 to the outflow passage 3. Conversely, when the fluid flows backward from the outflow passage 3 into the inflow passage 2, the valve body 7 in the reverse flow fluid is pushed to move the valve seat 6 direction, the first abutment surface 24 of the valve body 7 is first elastic a first abutment seat surface 15 of the first valve seat portion 10 formed of a material in contact, one first stomach abutment surface 24 and the first while maintaining the contact between the first abutment seat surface 15 The second contact surface 25 of the valve body 7 comes into contact with the second contact seat surface 12 of the second valve seat portion 11 by obtaining elastic deformation of the valve seat portion 10. The first contact seat 15 first abutment surface 24 of the valve body 7 you abutment and is formed in the tip of the annular projection 14, the valve body 7 is the first valve seat portion 10 The elastic deformation of the first valve seat portion 10 when it comes into contact with can be obtained with certainty.
[0032]
Then, in the first abutment surface 24 of the valve body 7 in contact with the first contact seat 15, concave tapered first contact seat 15 is gradually decreasing diameter toward the inlet passage 2 side Further, the first contact surface 24 of the valve body 7 is formed in a convex taper shape substantially corresponding to the first contact seating surface 15, so that the first contact surface 24 is the first contact surface 24. when in contact with the abutment seat surface 15, the first contact seat 15 formed in a concave tapered is spread by a first abutment surface 24 formed on the convex taper shape toward the outer circumference, this restoration depending on the force and the first abutment surface 24 of the valve body 7 adhesion is increased between the first abutment seat surface 15, improved sealing properties, the first abutment surface 24 and the first abutment seat surface 15 Even if there is a dust bit between them, the sealing reliability is ensured and fluid leakage can be surely prevented.
[0033]
In the valve body 7, the impact caused by the contact of the first valve seat portion 10 is buffered by the elastic deformation of the first valve seat portion 10 and then contacts the second valve seat portion 11, so that noise is generated due to the impact. Is prevented.
[0034]
Further, in the contact of the second contact seat surface 12 of the second contact surface 25 and the second valve seat portion 11 of the valve body 7, the second contact seat surface 12 moves the valve body 7 is formed in a planar shape perpendicular to the direction, the second abutment surface 25 of the valve body 7 and is formed in a plane shape corresponding to the second contact seat 12, the second contact seat 12 There can receive reliably second abutment surface 25 of the valve body 7 comes to move, it is possible to prevent the excessive deformation of the first valve seat portion 10 formed by elastic material, pressure resistance and durability It is possible to improve the performance.
[0035]
Further, in this embodiment, in the valve body 7 has a body portion 23 having a predetermined length in the moving direction, the body portion 23 is slightly are formed smaller in diameter than the inner diameter of the valve chamber 1, The side surface 26 is formed in a convex curved surface having a small diameter in the front and rear in the moving direction, and this body portion 23 is supported by the point contact with the inner wall of the valve chamber 1. Since the movement resistance of the valve body 7 is small and the movement is not caught, a smooth and stable movement is obtained in the valve body 7, and particularly when used as a vacuum breaking valve, the vacuum breaking pressure is stabilized.
[0036]
Further, in this embodiment, the valve chamber 1 which movably accommodates a valve body 7, it is formed the wall 28 to prevent movement of more abut the valve body 7 to move to the side away from the valve seat 6 cage, the valve body 7 provided in the valve chamber 1, the contact surface of the valve seat 6, the fitting projection 29 to the valve port 5 and loosely you want to open the valve seat 6 is formed, the fitting fitting protrusions 29, even if there is movement to the valve body 7 contacts the wall 28 of the valve chamber 1, a part of the tip is formed to a length that stops in the valve opening 5, the valve body 7 since the fitting projection 29 formed does not come off it is in a valve port 5 which opens into the valve seat 6 always in, without supporting the valve body 7 in the axial or the like in the valve chamber 1, the valve body 7 valve when moved to the seat 6 direction, it is possible to valve body 7 closes the valve port 5 reliably contact with the valve seat 6. Also, as described above, it is not necessary such as a shaft for supporting the valve body 7, there is no transfer resistance due to that amount of friction, is possible to further stabilize the vacuum breaking pressure when used as a vacuum breaker valve In addition, it is possible to obtain a good flow with less fluid resistance.
[0037]
Further, the fitting projection 29 is roughly the same diameter of the base portion and the inner diameter of the valve port 5, gradually tapered guide surface 30 that is a smaller diameter is formed toward the distal end, the valve body 7 is moved to the valve seat 6 direction when, is guided through the valve port 5 on the guide surface 30 of that mating protrusions 29 move to the inner part, the first abutment surface 24 of the valve body 7 is in the first valve seat portion 10 of the valve seat 6 1 Since the abutment seat surface 15 and the second abutment surface 25 are surely abutted against the second abutment seat surface 12 of the second valve seat portion 11 of the valve seat 6, the valve body 7 can be smoothly moved. Movement and seal integrity are obtained.
[0038]
The further valve according to the present invention, as described above a small number of parts, and also the attachment to the valve housing 4 of the valve seat 6, the second valve the first valve seat portion 10 toward the valve chamber 1 side the substrate 17 constituting the seat portion 11, by utilizing the internal thread 8 to be screwed with the inflow side pipe formed in the inflow passage 2 inner circumferential surface of the valve housing 4, is attached by screwing a female screw 8 Therefore, the female screw 8 is used for both the connection of the inflow side piping and the screwing of the base body 17 constituting the second valve seat portion 11, thereby not only reducing the number of parts but also facilitating manufacturing and reducing the cost. I can plan.
[0039]
【The invention's effect】
According to the valve according to the present invention as described above, reliability of sealing, pressure resistance, to ensure durability, and to solve the noise problem, the further, easily cost production and reduce the number of parts Since it can be reduced and the movement resistance of the valve body can be reduced, a stable vacuum breaking pressure can be obtained particularly when used as a vacuum breaking valve.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which a flow path is open when a fluid is flowing in a forward direction in an example of an embodiment of a valve according to the present invention.
FIG. 2 is a longitudinal sectional view showing a contact process between a valve body and a valve seat when fluid flows backward from the outflow passage to the inflow passage.
FIG. 3 is a longitudinal sectional view showing a contact process between a valve body and a valve seat when a fluid flows backward from the outflow passage to the inflow passage.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve chamber 2 Inflow passage 3 Outflow passage 4 Valve housing 5 Valve port 6 Valve seat 7 Valve body 10 1st valve seat part 11 2nd valve seat part 12 2nd contact seat surface 14 Annular protrusion 15 1st contact seat Surface 23 body 24 first contact surface 25 second contact surface 28 wall 29 fitting projection 31 spring

Claims

The valve housing outlet passage on the other side inflow passage is formed on one side of the valve chamber is formed with inside, the inlet passage side of said valve chamber, a valve seat that opens the valve port, said the valve chamber, when from the inlet passage receiving the fluid pressure to the outlet passage, and moves to the side away from the valve seat to open the valve port, the fluid pressure to the inlet passage from the outlet passage when received, it moves to the valve seat direction, comprising a valve body for closing the valve port contact the valve seat and the person, the valve seat, non-elastic material and the first valve seat portion formed of an elastic material in is composed of a second valve seat portion formed, the valve body when moving the valve seat direction, the valve body is first abuts the first valve seat portion, and then between the first valve seat portion while maintaining the contact state, the valve is configured to contact with the second valve seat portion to obtain an elastic deformation of the first valve seat portion Stomach,
The second valve seat portion has a valve opening in the center, and the periphery of the valve port serves as a second contact seat surface, and the first valve seat portion is arranged on the outer periphery of the second contact seat surface, An annular protrusion protruding into the valve chamber so as to come into contact with the valve body prior to the second contact seat surface, and a first contact seat surface is formed at a tip of the annular protrusion; The first abutting seat surface is formed in a concave taper shape having a gradually decreasing diameter in the direction in which the valve body moves toward the inflow passage, and the second abutting seat surface is formed by the valve body being inflowed. The valve body is formed in a flat shape perpendicular to the direction of movement toward the passage side, and the valve body is formed in a convex taper shape substantially corresponding to the first abutting seat surface, and is in contact with the first valve seat portion. a first contact surface in contact, are formed in a planar shape corresponding to the second contact seat, to characterized in that it has a second valve seat portion and abutting the second abutment surface Valve.

2. The valve according to claim 1, wherein the valve body has a body portion, and a side surface of the body portion is formed in a convex curved surface having a small diameter in front and rear in the moving direction .

The valve chamber is formed with a wall that abuts a valve body that moves away from the valve seat and prevents further movement. The valve body has a valve opening that is open to the valve seat and a free play. A fitting protrusion is formed, and the fitting protrusion is formed to have such a length that a part of the tip of the fitting protrusion stops in the valve opening even when the valve body moves until it comes into contact with the wall. The valve according to any one of claims 1 and 2 .

The valve according to claim 1, wherein the valve housing is provided with a spring that urges the valve body in the valve seat direction .

5. The valve according to claim 1, wherein an outer periphery of the second valve seat portion is screwed into the inflow passage of the valve housing .