JP2004060871A - Valve device - Google Patents

Valve device Download PDF

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Publication number
JP2004060871A
JP2004060871A JP2002224065A JP2002224065A JP2004060871A JP 2004060871 A JP2004060871 A JP 2004060871A JP 2002224065 A JP2002224065 A JP 2002224065A JP 2002224065 A JP2002224065 A JP 2002224065A JP 2004060871 A JP2004060871 A JP 2004060871A
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Japan
Prior art keywords
valve
shaft member
connection port
bearing
seal portion
Prior art date
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JP2002224065A
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Japanese (ja)
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JP3902090B2 (en
Inventor
Taizo Yamamoto
山本　泰三
Junichi Ueda
上田　純一
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OSAKA SANITARY KINZOKU KOGYO KYODO KUMIAI
Nabco Ltd
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OSAKA SANITARY KINZOKU KOGYO KYODO KUMIAI
Nabco Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve device dispensing with a gap forming portion in a valve head part and being capable of shielding a gap between a bearing and a part supported by the bearing. <P>SOLUTION: This device comprises a valve frame body 2, a shaft member 5 slidably provided inside the valve frame body 2, a valve element 10 fixed on tip of the shaft member 5, a bearing 6 slidably supporting the shaft member 5 and a slide mechanism 4 for sliding the shaft member 5. The valve element 10 has a valve head part 11 abutting against a peripheral part 3c by contact slide to a first connection port 3a and making a valve open state, and a cylindrical seal portion 12 extended from the valve head part 11 to the bearing 6 side, fixed at the end so as to partition a portion where the bearing and the shaft member 5 slide from an inner fluid passage 3 and deformed according to sliding of the shaft member 5. A deformation restricting part 20 contacting the middle part of the seal part 12 and restricting curving deformation toward inside is formed on at least the shaft member 5. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば清浄性が要求される食品、薬品等の流体を対象とした通路の連結に好適に用いられる弁装置に関する。
【０００２】
【従来の技術】
上述した弁装置として、例えばサニタリー用継手が知られている。この継手は、図１２（ａ）及び（ｂ）に示すように、内部流体通路１０２を有する雌継手１０１と、内部流体通路１１２を有する雄継手１１１とが用いられ、内部流体通路１０２および１１２はそれぞれ別の流体通路に接続される。雌継手１０１は、その上端に突き合わせ面１０１ａを有し、雄継手１１１はその下端に突き合わせ面１１１ａを有し、これら両突き合わせ面１０１ａ、１１１ａは互いに同一軸線上で突き合わされる。突き合わせ後、雌継手１０１に設けた弁体１０３を弁座１０４から離れるようにスライドさせるとともに、雄継手１１１に設けた弁体１１３を弁座１１４から離れるようにスライドさせ、これによりそれぞれの内部流体通路１０２、１１２が連通する接続状態（図１２（ｂ）の状態）になる。逆に、弁体１０３を弁座１０４に、弁体１１３を弁座１１４にそれぞれ接触させることで遮断され、かつ両突き合わせ面１０１ａ、１１１ａを互いに離すことで、内部流体通路１０２、１１２がそれぞれ切離された状態（図１２（ａ）の状態）になる。
【０００３】
前記弁体１０３および１１３は、それぞれに設けられた軸部１０５および１１５と、これら軸部１０５および１１５をそれぞれ支持する軸受１０６および１１６とによりスライド可能に支持されており、軸部１０５の途中に設けたフランジ１０７と軸受１０６との間が可撓性膜１０８にて覆われ、かつ軸部１１５の途中に設けたフランジ１１７と軸受１１６との間が可撓性膜１１８にて覆われている。前記可撓性膜１０８および１１８は、内部流体通路１０２、１１２が連通する接続状態のとき、軸部１０５、１１５と軸受１０６、１１６との摺動部分である隙間に、移送される流体が入って残るのを防止するために設けられている。
【０００４】
【発明が解決しようとする課題】
ところで、上述した可撓性膜１１８は、図１２および図１３（雄継手１１１側を示す）に示すように、軸部１１５を２分割した一方の分割軸部１１５ａとフランジ１１７との間に、他方の分割軸部１１５ｂにて押圧した状態で挟み込まれて設けられており、もう一方の可撓性膜１０８も同様にして設けられている。この構成を採用するのは、可撓性膜１０８等の端部を軸部に直接固着することが困難である故に、軸部を分割してその間を固着部として用いるためである。
【０００５】
したがって、従来の継手による場合には、分割軸部１１５ａ等とフランジ１１７等との接合部Ｘが内部流体通路１１２等に露出しているため、その接合部Ｘに、移送される流体が入り込んで残る虞があり、改善の余地があった。
【０００６】
また、弁体１０３、１１３は、先端の弁頭部１０３ａ、１１３ａの周囲に、弁座１０４、１１４に当接するリング状の当接部材１０３ｂ、１１３ｂが別部材により取付けられているため、弁頭部１０３ａ、１１３ａに当接部材１０３ｂ、１１３ｂとの間で生じる隙間形成部が存在し、その隙間形成部でも移送される流体が入り込んで残る虞があり、改善の余地があった。
【０００７】
本発明は、このような従来技術の課題を解決するためになされたものであり、弁頭部における隙間形成部を無くし、かつ、軸受とこれにより支持される部分との間の隙間を簡潔な構造で遮蔽することができる弁装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
請求項１の発明に係る弁装置は、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って内側に湾曲変形する筒状シール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、上記軸部材には、少なくとも開弁状態で内部流体を通流しているときに、内側に湾曲変形する該シール部における両端間の途中部分と接触し、該途中部分の内側への湾曲変形を規制する外周面を有する変形規制部が設けられていることを特徴とする。
【０００９】
この弁装置にあっては、弁頭部の表層部から軸受側に延出されて端部が固定された筒状シール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、筒状シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、筒状シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、少なくとも開弁状態で内部流体を通流しているとき、つまり使用状態において、内部流体通路を流れる内部流体からシール部の途中部分に作用する圧力を変形規制部で受けるようにすることができ、これによりシール部の途中部分が受ける圧力を減少させ得、シール部の耐久性を向上させることが可能となる。
【００１０】
請求項２の発明に係る弁装置は、請求項１に記載の弁装置において、前記変形規制部は、閉弁状態から前記途中部分と接触して内側への湾曲変形を規制することを特徴とする。
【００１１】
この弁装置にあっては、開弁状態は勿論のことながら、閉弁状態（第２接続口に配管等が接続され、シール部に圧力が付与されている）のときにおいても、内部流体からシール部に作用する圧力を変形規制部が受けるので、シール部の耐久性をより向上させることが可能となる。
【００１２】
請求項３の発明に係る弁装置は、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、少なくとも開弁状態で内部流体を通流しているときに、該弁枠体側シール部分と接触するリング状の弁枠体側ガイドが設けられ、該弁枠体側ガイドが弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持されることを特徴とする。
【００１３】
この弁装置にあっては、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、弁枠体と軸部材との境界部分と、それに対応する弁枠体側シール部分との間にリング状の弁枠体側ガイドが設けられ、その弁枠体側ガイドが、少なくとも開弁状態で内部流体を通流しているときにおいて弁枠体側シール部分と接触するので、これにより弁枠体側シール部分に及ぶ圧力を低減させてシール部の耐久性を向上させ得る。また、弁枠体側ガイドが、弁枠体と移動部材とにより撓み変形可能に支持されているので、弁枠体側シール部分を変形部として利用することができる。
【００１４】
請求項４の発明に係る弁装置は、請求項３に記載の弁装置において、軸部材が閉弁状態から開弁状態にスライドする途中から移動部材を弁枠体が支持し、かつ軸部材が開弁状態から閉弁状態にスライドする途中から移動部材を軸部材が支持し、弁枠体に支持されてから軸部材に支持されるまでの間では移動部材を非移動状態とする移動部材の追従機構が設けられていることを特徴とする。
【００１５】
この弁装置にあっては、弁枠体側ガイドを支持する移動部材が、軸部材のスライド量に比べて移動量が短く、これにより弁枠体側ガイドが撓む量を小さくすることが可能となり、弁枠体側ガイドの耐久性も向上させ得る。
【００１６】
請求項５の発明に係る弁装置は、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、シール部の弁頭部背面側に回り込んでいる回り込み部分と弁頭部の背面側との間に、少なくとも開弁状態で内部流体を通流しているときに回り込み部分と接触するリング状の弁頭部側ガイドが設けられていることを特徴とする。
【００１７】
この弁装置にあっては、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、シール部の回り込み部分と弁頭部の背面側との間にリング状の弁頭部側ガイドが設けられ、その弁頭部側ガイドが、少なくとも開弁状態で内部流体を通流しているときにおいてシール部の回り込み部分と接触するので、回り込み部分に及ぶ圧力を低減させて、シール部の耐久性を向上させ得る。
【００１８】
請求項６の発明に係る弁装置は、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、上記軸部材に設けられ、少なくとも開弁状態で内部流体を通流しているときに、該シール部における両端間の途中部分と接触し、該途中部分の内側への変形を規制する外周面を備える変形規制部を有するとともに、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持された状態で設けられ、少なくとも開弁状態で内部流体を通流しているときに該弁枠体側シール部分と接触するリング状の弁枠体側ガイド、および、シール部の弁頭部背面側に回り込んでいる回り込み部分と弁頭部の背面側との間に設けられ、少なくとも開弁状態で内部流体を通流しているときに回り込み部分と接触するリング状の弁頭部側ガイドのうちの少なくとも一方を有することを特徴とする。
【００１９】
この弁装置にあっては、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、シール部の途中部分が変形規制部にて規制され、また、シール部の弁枠体側シール部分および回り込み部分の少なくとも一方が該当するガイドにて規制されるので、シール部のほぼ全体が異常に変形することを抑制でき、これによりシール部の内側に一体に設けられる補強用膜を省くことが可能となる。特に、変形規制部に加えて、弁枠体側ガイドと弁頭部側ガイドの両方をも備えた構成にすると、シール部の各部での異常変形は、補強用膜を省略しても完全に防止することができる。
【００２０】
請求項７の発明に係る弁装置は、請求項６に記載の弁装置において、弁枠体側ガイドおよび弁頭部側ガイドを有し、閉弁状態のとき、弁枠体側シール部分および回り込み部分の少なくとも一方が該当するガイドから離れ、開弁状態のとき、弁枠体側シール部分が弁枠体側ガイドを押圧して撓み変形させることを特徴とする。
【００２１】
この弁装置にあっては、閉弁状態のとき、シール部の弁枠体側シール部分および回り込み部分の少なくとも一方が該当するガイドから離れる。また、開弁状態のとき、弁枠体側シール部分が弁枠体側ガイドを押圧して撓み変形させるので、シール部の途中部分よりも端側の両端部が、軸部材のスライドに伴って傾きが変化し、シール部の変形部として機能するため、これによりシール部の変形部を両端に分散させることができ、結果としてシール部の径を小径に抑えることができ、これによりシール部の小型化が図れる。また、シール部の変形部を両端に分散させることにより、軸部材のスライド量も大きく設計することが可能となる。
【００２２】
請求項８の発明に係る弁装置は、請求項１に記載の弁装置において、前記シール部は、軸部材のスライド方向に沿って複数の鼓状部を有するものであることを特徴とする。
【００２３】
この弁装置にあっては、複数の鼓状部の各々が、内側へ湾曲変形するので、軸部材のスライド量を著しく大きく設計することが可能となる。
【００２４】
請求項９の発明に係る弁装置は、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形する筒状シール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、前記シール部は、前記弁頭部の背面側に回り込んでいる回り込み部分と、弁頭部より小径の途中部分と、該途中部分から連続して拡径する弁枠体側シール部分とを有し、前記回り込み部分の径が拡大しながら前記弁頭部から離れるとともに、前記弁枠体側シール部分の径が拡大しながら前記軸受から離れて、弁体が開弁状態から閉弁状態に移動可能となっているとともに、軸部材のスライドに伴う回り込み部分および前記弁枠体側シール部分の径の拡大程度が、途中部分での径の拡大程度よりも大きいことを特徴とする。
【００２５】
この請求項９に記載の弁装置において、回り込み部分と途中部分との境界部分、および弁枠体側シール部分と途中部分との境界部分が、軸部材のスライドに伴って変形する変形部として機能するようになっている構成とすることが好ましい（請求項１０）。
【００２６】
このような弁装置にあっては、弁頭部の表層部から軸受側に延出されて端部が固定された筒状シール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、筒状シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、筒状シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、弁体が開弁状態から閉弁状態へ移動することに伴い、シール部の回り込み部分が弁頭部から離れるとともに、弁枠体側シール部分が軸受から離れるので、シール部の途中部分よりも端側の両端部が、軸部材のスライドに伴って傾きが変化し、シール部の変形部として機能するため、これによりシール部の変形部を両端に分散させることができ、結果としてシール部の径を小径に抑えることができ、これによりシール部の小型化が図れる。また、シール部の変形部を両端に分散させることにより、軸部材のスライド量も大きく設計することが可能となる。
【００２７】
請求項１１の発明に係る弁装置は、請求項３、４、７、８、９または１０に記載の弁装置において、シール部における弁枠体に固定された端部に最も近い位置に形成される内側湾曲部から該端部までが、連続して軸受側寄りに位置するとともに、該端部が第２接続口の軸受側部分よりも第１接続口側に位置するように、前記弁枠体側ガイドがシール部を規制することを特徴とする。
【００２８】
この弁装置にあっては、第２接続口の軸受側部分から、弁枠体に固定されたシール部端部に最も近い位置に形成される内側湾曲部までが、連続的に第１接続口側に位置するので、これにより内部流体通路を流れる内部流体を淀ませるような窪みの形成が無くなる。また、上記窪みの形成が無いため、弁洗浄を行うとき、窪みに伴う洗浄効率の低下を防止することが可能となる。
【００２９】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づき具体的に説明する。
【００３０】
図１は、本発明の弁装置を適用したサニタリー用の継手を示す縦断面図であり、閉弁状態を示す。図２はその継手が開弁状態となっているときを示す縦断面図、図３はその継手の開弁状態（左側）と開弁状態（右側）とを併せて示す縦断面図である。
【００３１】
この継手１は、内部流体通路３を有する弁枠体２と、スライド機構４によりスライドされる軸部材５と、その軸部材５の途中を支持し、弁枠体２の一部を構成する軸受６と、軸部材５の先端部に取付けられた弁体１０とを備える。
【００３２】
弁枠体２には、内部流体通路３の一端（上側）に第１接続口３ａが、その他端（右側）に第２接続口３ｂがそれぞれ設けられている。第１接続口３ａは、例えば移送先（または移送元）に繋がった別の継手（図示せず）に、着脱可能な状態で連結され、第２接続口３ｂは、例えば移送元（または移送先）に繋がったホース等の配管（図示せず）に連結される。
【００３３】
上記軸部材５は、弁枠体２の内部に設けられ、基端側に設けられたスライド機構４により第１接続口３ａに対して接離する方向へスライド可能となっている。軸部材５の途中は、軸受６によりスライド自在に支持されている。スライド機構４は、例えば空気アクチュエータ、電磁石或いは手動ハンドル等の公知手段が用いられる。
【００３４】
軸部材５の外側には、先端（図の上端）よりも少し基端側（図の下側）に寄った位置から軸受６にて支持される部分よりも少し先端側に寄った位置までの間に変形規制部２０が軸部材５と一体に設けられている。この変形規制部２０は、軸部材５の他の部分よりも半径が長く形成され、先端側から、外周面が軸方向に沿って湾曲した湾曲部２１と、追従機構の一部として機能する３つの段差部２２、２３、２４とを有し、各段差部２２、２３、２４の外径はそれぞれ異なる値でスライド方向に沿って一定に設定されている。具体的には、段差部２２の外径が最も小さく、段差部２４の外径が最も大きく、段差部２３の外径は両者の間に設定されている。なお、変形規制部２０は、湾曲部２１の代わりに、外周面がほぼ同一直径を有する形状、或いは、外周面の先端側が基端側よりも徐々に縮径または拡径した形状、或いは他の任意の外周面形状にすることができる。
【００３５】
上記弁体１０は、上述したように軸部材５の先端部に取付けられ、表層部１１ａと取付部１１ｂとを有する弁頭部１１と、弁頭部１１の表層部１１ａから軸受６側に延出された円筒状のシール部１２とを備える。取付部１１ｂは金属や他の非可撓性材料からなり、この取付部１１ｂには軸部材５の先端部が螺着されていて、表層部１１ａおよびシール部１２の全体は、合成樹脂、例えばテフロン（ＰＴＦＥ：四フッ化エチレン樹脂）により一体成形にて形成されている。弁頭部１１は、軸部材５が第１接続口３ａへの接近スライドにより、第１接続口３ａの周縁部３ｃに当接する進出限位置に移動すると、第１接続口３ａを閉弁状態にし（図１参照）、軸部材５の第１接続口３ａからの離隔スライドにより、第１接続口３ａの周縁部３ｃから離隔して第１接続口３ａを開弁状態にする（図２参照）。ここで、開弁状態とは、軸部材５が離隔スライドにより後退限位置にまで後退した状態をいう。
【００３６】
上記弁頭部１１の最大径部１１ｃから軸受６側に、シール部１２が延出されて袋状に形成されていて、そのシール部１２の基端側は、開口端となっている。その開口端の全周は、複数に分割された弁枠体２の一部と軸受６の境界面２ａで挟持することで固定されている。これによりシール部１２は、軸受６と軸部材５との摺接する部分を内部流体通路３から区画している。なお、シール部１２を固定する弁枠体２の開口面積は、第１接続口３ａの開口面積とほぼ同等にすることが好ましい。
【００３７】
上記境界面２ａには、図４（ｂ）に示す弁枠体側ガイド１４の外周部１４ａも挟持されている。この弁枠体側ガイド１４は、後述する弁枠体側シール部分１２Ｂの変形を規制するもので（図３参照）、例えばゴム等の弾性材料からなる円リング状のものであって、断面形状は内周側が概略三角形状、外周側がほぼ厚み一定に形成されている。断面形状が概略三角形状をした内周部１４ｂは、前記段差部２２と、弁枠体２の境界面２ａより内側に設けた凹状の切欠部６ｂとの間、つまり変形規制部２０と弁枠体２の境界部分の凹部に配置される。また、弁枠体側ガイド１４の軸受６側には円リング状をした移動部材１５が配されている。
【００３８】
この移動部材１５は、下端の内周側が切欠かれた、追従機構の一部として機能する段付部１５ａを有し（図３参照）、軸部材５のスライドにより、そのスライド方向に追従移動する。具体的には、軸部材５が進出限位置にあるときは、移動部材１５の段付部１５ａが、段差部２３と２４の間の部分と係合し、下端が切欠部６ｂから浮いた状態となる。軸部材５がその状態から後退していくと、それに伴って移動部材１５は下に降下していき、ある位置まで降下すると、移動部材１５の下端が切欠部６ｂと係合（接触）するようになる。その後、更に軸部材２５が後退限位置まで離隔スライドしても、移動部材１５は切欠部６ｂに規制されて非移動状態になる。更に、その後退限位置から前側に接近スライドを行って段差部２３と２４の間の部分が切欠部６ｂの底面よりも高くなると、移動部材１５の段付部１５ａが、段差部２３と２４の間の部分と係合するようになり、その後は下端が切欠部６ｂから浮いた状態となる。このような移動部材１５の追従移動は、軸部材５のスライドに伴って同様に繰り返す。
【００３９】
そして、この移動部材１５の追従移動により、弁枠体側ガイド１４が変形可能となる。具体的には、閉弁状態においては、図１および図３の左側に示すように弁枠体側ガイド１４の下端側が段差部２２と２３の間で係合して、弁枠体側ガイド１４は弾性により圧縮変形可能であるが形状変形（撓み変形）をしない状態となる。これに対して、開弁状態においては、図２および図３の右側に示すように移動部材１５の移動により段差部２２と２３の間が降下し、弁枠体側ガイド１４の下側に隙間が形成されるため、弁枠体側ガイド１４は、開弁状態とされることで変形するシール部１２の下端部分で下側に押圧されることにより、下側に撓む形状変形が可能となる。
【００４０】
弁頭部１１の背面側には、図４（ａ）に示す弁頭部側ガイド１３が接着等により取付けられている。この弁頭部側ガイド１３は、後述する回り込み部分１２Ｃの変形を規制するもので（図３参照）、例えばゴム等の弾性材料からなる円リング状のものであって、断面形状は内周側が厚く外周側が薄い三角形状となっており、弁頭部側ガイド１３の内側には、軸部材５の先端部が挿通している。なお、弁頭部側ガイド１３は、非可撓性の取付部１１ｂと一体に形成してもよい。
【００４１】
上記シール部１２は、軸部材５のスライドに伴って変形する。そのシール部１２の変形は、本実施形態では、図３に示すように、軸部材５（または弁体１０）が進出限位置（図１に示す位置）にある閉弁状態のときに、途中部分１２Ａ（シール部１２の回り込み部分１２Ｃと弁枠体側シール部分１２Ｂを除く部分）は変形規制部２０の外周面、実質的には湾曲部２１と接触し、その変形規制部２０の外周面の形状に応じた形状とされ、軸部材５が後退限位置（図２に示す位置）にある開弁状態となっても、つまり開弁・閉弁状態に拘わらず変形規制部２０の外周面と接触したままであり、その外周面の形状に応じた形状のままである（但し、変形規制部２０との接触位置の変化により若干の形状変化は伴う）。また、シール部１２の弁頭部１１の背面側に回り込んでいる回り込み部分１２Ｃは、開弁状態のときには、弁頭部側ガイド１３に接触し、弁頭部側ガイド１３の外周面に応じた形状とされ、この形状変化に伴って、回り込み部分１２Ｃから途中部分１２Ａまでの全域が変形規制部２０と接触し、その変形規制部２０の外周面の形状に応じた形状とされる。そして、開弁状態から閉弁状態に軸部材５が移動するに伴って、回り込み部分１２Ｃは軸部材の軸心から離れるように拡径しながら弁頭部側ガイド１３から離れていく。よって、シール部１２の弁頭部１１側は、弁頭部側ガイド１３に接触する回り込み部分１２Ｃと、変形規制部２０に接触する途中部分１２Ａとの境界部分１２Ｅが湾曲変形する。また、シール部１２の境界面２ａにて固定された端部から途中部分１２Ａまでの弁枠体側シール部分１２Ｂは、軸部材５の後退により移動部材１５が降下して形状変形可能となった弁枠体側ガイド１４を下側に押し付ける状態となる。つまり、弁枠体側ガイド１４の内周面側を下側に押した状態に撓み変形させ、その弁枠体側ガイド１４の外周面の一部と接触する。そして、弁枠体側シール部分１２Ｂと途中部分１２Ａとの境界部分１２Ｅでは、下側に隙間が形成され、かつその隙間のある箇所が湾曲した状態とされる。一方、軸部材５が開弁状態から閉弁状態に移動するに伴って、弁枠体側シール部分１２Ｂは、軸部材の軸心から離れるように拡径しながら軸受６から離れていく。これに伴って、撓み変形していた弁枠体側ガイド１４が元の状態に戻る。なお、この段落では、流体からの圧力が作用しない、つまり配管に接続する前の状態におけるシール部１２各部が形状変化の状態を説明している。
【００４２】
すなわち、本実施形態のシール部１２にあっては、途中部分１２Ａは開弁・閉弁状態に拘わらず変形規制部２０に接触してその周面に応じた形状とされるため、ほぼ変形をしない。これに対して、回り込み部分１２Ｃと途中部分１２Ａとの境界部分１２Ｅが湾曲変形し、回り込み部分１２Ｃの傾きが変化する。同様に、弁枠体側シール部分１２Ｂと途中部分１２Ａとの境界部分１２Ｆが湾曲変形し、弁枠体側シール部分１２Ｂの傾きが変化する。つまり、シール部１２の途中部分１２Ａよりも端側の両端側、特に回り込み部分１２Ｃと途中部分１２Ａとの境界部分１２Ｅ、および弁枠体側シール部分１２Ｂと途中部分１２Ａとの境界部分１２Ｆ湯が変形部として機能する。なお、弁体１０が後退限位置（つまり、開弁状態）にあるとき、シール部１２は弁頭部１１ａと繋がる部分より軸受６側が連続して軸受６側寄りに位置し、弁頭部１１ａ側へ折り返しされることがないような形状状態に設計されており、また、弁枠体側ガイド１４は、開弁状態（流体の圧力が作用しないとき）にあるとき、上述したように移動部材１５の移動により下側に撓む形状変形を生じても、前記の形状状態とするように設計されている。当然のことながら、内部流体通路３に流体を流した場合でも、前記の形状状態が維持されるようになっている。
【００４３】
したがって、第１実施形態の継手１にあっては、弁体１０が、弁頭部１１から軸受６側に延出されて弁枠体２に固定された筒状シール部１２までが一体形成されているので、従来のようにリング状の当接部材（１０３ｂ、１１３ｂ）を使用することなく、弁頭部１１における隙間形成部を無くすことが可能となる。また、シール部１２が軸受６と軸部材５との摺接する部分を内部流体通路３から区画するので、軸受６とこれにより支持される軸部材５との摺接する部分を遮蔽することができる。更に、弁体１０は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部１２の基端側の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造にすることができる。
【００４４】
また、第１実施形態にあっては、配管に接続して流体が流れるようにした開弁状態、つまり使用状態において、内部流体通路３を流れる内部流体から途中部分１２Ａに作用する圧力を変形規制部２０で受けるようにすることができ、これにより途中部分１２Ａが受ける圧力を減少させ得、シール部１２の耐久性を向上させることが可能となる。更に、シール部１２の回り込み部分１２Ｃと弁頭部１１ａの背面側との間にリング状の弁頭部側ガイド１３が設けられ、その弁頭部側ガイド１３が、開弁状態においてシール部１２の回り込み部分１２Ｃを受けるので、回り込み部分１２Ｃに及ぶ圧力を低減させてシール部１２の耐久性を向上させ得る。更に、弁枠体２と軸部材５との境界部分と、それに対応する弁枠体側シール部分１２Ｂとの間にリング状の弁枠体側ガイド１４が設けられ、その弁枠体側ガイド１４が、開弁状態において弁枠体側シール部分１２Ｂを受けるので、これにより弁枠体側シール部分１４に及ぶ圧力を低減させてシール部１２の耐久性を向上させ得る。また、弁枠体側ガイド１４が、弁枠体２と移動部材１５とにより撓み変形可能に支持されているので、弁枠体側シール部分１２Ｂを変形部として利用することができる。
【００４５】
また、本実施形態においては、閉弁状態のとき、シール部１２の回り込み部分１２Ｃが弁頭部側ガイド１３から離れ、開弁状態のとき、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４を押圧して撓み変形させるので、換言すれば、回り込み部分１２Ｃの径が拡大しながら弁頭部１１から離れるとともに、弁枠体側シール部分１２Ｂの径が拡大しながら軸受６から離れて、弁体１０が開弁状態から閉弁状態に移動可能となっているとともに、軸部材５のスライドに伴う回り込み部分１２Ｃおよび弁枠体側シール部分１２Ｂの径の拡大程度が、途中部分１２Ａでの径の拡大程度よりも大きいので、シール部１２の途中部分１２Ａよりも端側の両端部が、軸部材５のスライドに伴って傾きが変化し、シール部１２の変形部として機能するため、これによりシール部１２の変形部を両端に分散させることができ、結果としてシール部１２の径を小径に抑えることができ、これによりシール部１２の小型化が図れる。また、シール部１２の変形部を両端に分散させることにより、軸部材５のスライド量も大きく設計することが可能となる。
【００４６】
なお、上述した実施形態では、閉弁状態のとき、シール部１２の回り込み部分１２Ｃが弁頭部側ガイド１３から離れるようにしているが、本発明はこれに限らず、閉弁状態のとき、シール部１２の弁枠体側シール部分１２Ｂが弁枠体側ガイド１４から離れるようしたり、或いは、閉弁状態のとき、シール部１２の回り込み部分１２Ｃが弁頭部側ガイド１３から離れるとともに弁枠体側シール部分１２Ｂが弁枠体側ガイド１４から離れるようにしてもよい。更に、閉弁時に回り込み部分１２Ｃが弁頭部側ガイド１３に支持可能に、弁枠体側ガイド１４と同様に弁頭部側ガイド１３を移動可能にしてもよい。
【００４７】
また、上述した実施形態では、開弁状態（流体の圧力が作用しないとき）とすることで、回り込み部分１２Ｃが弁頭部側ガイド１３に接触するようにしているが、本発明はこれに限らない。例えば、軸部材５を種々のスライド位置としたうちで、配管を弁装置に接続せずに開弁状態とした場合には、回り込み部分１２Ｃが弁頭部側ガイド１３に接触せずに、配管を弁装置に接続して開弁状態とした場合に、つまり少なくとも内部流体の圧力が作用するときに、回り込み部分１２Ｃが弁頭部側ガイド１３に接触するように設計してもよい。
【００４８】
また、上述した実施形態では、開弁状態（流体の圧力が作用しないとき）とすることで、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４を押圧して撓み変形させるようにしているが、本発明はこれに限らない。例えば、軸部材５を種々のスライド位置としたうちで、配管を弁装置に接続せずに開弁状態とした場合には、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４と接触せず、配管を弁装置に接続して開弁状態とした場合に、つまり少なくとも内部流体の圧力が作用するときに、弁枠体側シール部分１２Ｂが弁枠体側ガイド１４を押圧して撓み変形させるように設計してもよい。
【００４９】
また、上述した実施形態では、開弁・閉弁状態（流体の圧力が作用しないとき）に拘わらず、途中部分１２Ａが変形規制部２０に接触するようにしているが、本発明はこれに限らない。例えば、軸部材５を種々のスライド位置としたうちで、配管を弁装置に接続せずに開弁状態とした場合には、途中部分１２Ａが変形規制部２０に接触せず、配管を弁装置に接続して開弁状態とした場合に、つまり少なくとも内部流体の圧力が作用するときに、途中部分１２Ａが変形規制部２０に接触するように設計してもよい。
【００５０】
また、上述した実施形態では、変形規制部２０で途中部分１２Ａを、弁枠体側ガイド１４で弁枠体側シール部分１２Ｂを、弁頭部側ガイド１３で回り込み部分１２Ｃをそれぞれ規制するようにしているが、本発明はこれに限らない。例えば、変形規制部２０に加えて、弁枠体側ガイド１４または弁枠体側シール部分１２Ｂの少なくとも一方を有する構成としてもよい。このような構成としても、シール部１２は、内部流体通路３を流れる流体による圧力を受けても破れることがないので、内側に補強用の膜を別途設ける必要性がなく、シール部１２単体でシールを行うことが可能である。その理由は、弁枠体側ガイド１４または弁頭部側ガイド１３の一方を省略してもシール部１２の大部分を他方のガイドと変形規制部２０とで受けることができ、省略したガイドが受ける筈のシール部１２の部分の面積が小さく、破断し難いからである。但し、前記面積が大きくなるような弁装置の場合には、変形規制部２０に加えて、弁枠体側ガイド１４および弁頭部側ガイド１３の両方を備えた構成とするのが、シール部１２の破断防止を図る上で好ましい。また、シール部１２が破断する虞がある場合には、破断の虞がある部分或いはシール部１２の全域の内側に補強用の膜を別途設けるようにしてもよい。
【００５１】
また、上述した実施形態では変形規制部２０を軸部材５とは一体構成としているが、本発明はこれに限らず、変形規制部を軸部材と別構成としてもよい。このようにしても、変形規制部と軸部材との境界は、シール部により内部流体通路３とは区画される。
【００５２】
また、本実施形態の場合には、シール部が筒状である故に、例えば特開平１０−２０５６２８号公報に開示された円錐状をしたダイアフラム弁（公報中の４０）を用いる場合、或いは、特開２００２−１２２２５３号公報に開示された円錐状のダイアフラム部（公報中の２）を有する弁（公報中の１）を用いる場合に比べ、以下のような有利な点がある。即ち、上記テフロンは、伸び率がゴムなどに比べて非常に低い。このような合成樹脂を用い、筒状シール部に代えて、弁頭部１１ａ側から軸受６側に向けて徐々に拡径した概略円錐状のダイアフラムをシール部として形成した場合は、軸部材５のスライド量がダイアフラムの傾き具合によるため、そのスライド量を例えば配管径の２５％に相当する寸法となるようにするには、配管径よりも遙かに大きい径のダイアフラムを要する。
【００５３】
そこで、本実施形態のように筒状シール部とすると、同径のダイアフラムに比べて伸縮長を長くすることができる。すなわち、筒状シール部を軸方向に伸ばすことで、伸縮する部分の距離が長くなり、テフロンのように伸び率が非常に低い樹脂等を用いても伸縮長が長くなる。よって、ダイアフラムよりも小径に形成することができる。また、図５に示すように途中部分１２Ａに、内側に湾曲した複数、図示例では２つの鼓状部１２Ｄを有する構成にすると、より伸縮長が長くなる。
【００５４】
なお、自然流下のパイプラインを組み替える工場設備の場合には、上述のような弁装置が数十個まとめて同一平面上に設置される。このような工場設備において、本発明のように筒状シール部にすることで、ダイアフラムにする場合よりも小径とすることができるため、工場設備の設置面積を小さくすることが可能となる。
【００５５】
更に、シール部を筒状に形成することにより、筒状シール部の径を配管径とほぼ同径寸法にすることが可能となる。なお、ダイアフラムを折り曲げて使用することにより、ダイアフラム径を小さくすることが考えられるが、ダイアフラムの折り曲げ部が凹状になって、その部分に内部流体が残存して好ましくない。
【００５６】
第１実施形態の弁装置は、筒状シール部を用いるので、折り曲げた状態にすることなく開弁・閉弁状態にすることができ、前述のようにシール部１２の弁頭部１１ａと繋がる部分より境界面２ａで固定された端部（下端部）までは、軸受６側が連続して軸受６側寄りに位置するとともに、図１および図２に示すように前記下端部が第２接続口の軸受側部分よりも第１接続口３ａ側に位置するため、前記凹状になる部分の発生を抑制して内部流体の残存を防止し、これにより洗浄性能、つまり内部流体を簡単に洗い流す性能および洗浄用流体の残留を減らす性能を向上させ得る。但し、本発明は、弁枠体側ガイドのみを備える構成の場合においては、上述のような利点を有する筒状シール部に限らず、ダイアフラム状のシール部に対しても、適用することができるのは勿論のことである。
【００５７】
また、上述した実施形態では筒状のシール部１２は、軸部材５の離隔スライドに伴って弁体が第１接続口３ａを開弁状態とする後退限位置にあるとき、内側になだらかに湾曲変形するよう設計されているが、本発明はこれに限らない。例えば、シール部１２の軸心方向の一部が内側または外側に断面「く」の字状に屈伸変形するように設計してもよい。但し、その場合にあっても、流体が溜まり難くなって残留することを防止でき、また洗浄性に優れるものとなるように、屈伸変形する部分より軸受６側が連続して軸受６側寄りに位置するように設計しておくことが好ましい。
【００５８】
また、シール部が断面「く」の字状に屈伸変形する場合、そのシール部は、弁体が第１接続口３ａを開弁状態とする後退限位置にあるとき、つまり折れ曲がり部分の内角が最小となるときに、各部寸法を定め、その寸法で金型の設計或いは切削時の寸法を決定し、作製するのが好ましい。このようにすると、シール部の折れ曲がり部分は、弁体が後退限位置にあるときに、内部応力が発生せず、繰り返し変形を受けても応力集中に伴って亀裂或いは破損が発生するのを防止できるからである。
【００５９】
或いは、弁体が後退限位置にある、つまり折れ曲がり部分の内角が最小となるときと、弁体が第１接続口３ａを閉弁状態とする前進限位置にある、つまり折れ曲がり部分の内角が最大となるときとの間の角度のときに、各部寸法を定め、その寸法で金型の設計或いは切削時の寸法を決定し、シール部を作製するのが好ましい。このようにすると、シール部の折れ曲がり部分は、弁体が後退限位置にあるときに圧縮力が軽減され、しかも弁体が前進限位置にあるときに引っ張り力が軽減されるので、繰り返し変形を受けても応力集中に伴って亀裂或いは破損が発生するのを、より効果的に防止できるからである。なお、この場合において、各部寸法を定める角度は、経験的に決めればよい。
【００６０】
更に、上述した実施形態では筒状シール部１２として途中部分１２Ａがなだらかに内側に湾曲するものを使用しているが、本発明はこれに限らない。例えば、図５〜図１０に示すように、開弁状態において、途中部分１２Ａや弁枠体側シール部分１２Ｂに、外側に湾曲した部分を有するシール部、或いは、図１１に示すように、開弁状態において、途中部分１２Ａの弁枠体側シール部分１２Ｂ側が内側に更に大きく湾曲した部分を有するシール部を使用することもできる。このような図示例の場合には、変形規制部２０のみを軸部材５に設けた構成としているので、シール部１２としてはテフロン膜２５（前記１２に相当）の内側に補強用の膜２６を別途設けた構成としている。なお、膜２６の内部の破線にて示す部分２６ａは、布等の補強部材である。
【００６１】
上述した図５に示すような複数、図示例では２つの鼓状部１２Ｄを有するシール部の場合には、前述したように個々の鼓状部１２Ｄが内側へ湾曲変形して伸縮長が長くなるので、軸部材５のスライド量を著しく大きく設計することが可能となる。また、図６〜図１１に示すようなシール部を用いる場合には、少なくともシール部の途中部分が変形規制部２０にて規制される故に、シール部の耐久性を向上させ得る。
【００６２】
また、上述した実施形態では、弁枠体側ガイドに対し、これを撓み変形させる移動部材および追従機構（段差部２２〜２４や段付部１５ａなど）を設けているが、本発明は弁枠体側ガイド側だけでなく、弁頭部側ガイドに対しても同様な移動部材や追従機構を設けるようにしてもよい。
【００６３】
また、上述した実施形態ではシール部と繋がった弁頭部の表層部１１ａをテフロンで、取付分１１ｂを別材料でそれぞれ形成しているが、本発明はこれに限らず、弁頭部およびシール部の全体をテフロン等の同一材料で形成してもよい。
【００６４】
また、上述した実施形態では弁体の合成樹脂としてテフロンを用いているが、本発明はこれに限らず、可撓性を有する一般の合成樹脂を用いることもできる。特に食品、薬品等の流体である場合には、耐薬品性に優れるテフロン、ＰＦＡ（四フッ化エチレン・パーフルオロアルコキシエチレン共重合樹脂）或いはＦＥＰ（四フッ化エチレン・六フッ化プロピレン共重合樹脂）などを用いるのが好ましい。
【００６５】
また、上述した実施形態ではサニタリー用継手に適用しているが、本発明はこれに限らず、その他の各種継手或いは開閉動作を行わせる弁に広く適用することができる。
【００６６】
【発明の効果】
以上詳述したように、本発明の請求項１に係る弁装置による場合には、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って内側に湾曲変形する筒状シール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、上記軸部材には、少なくとも開弁状態で内部流体を通流しているときに、内側に湾曲変形する該シール部における両端間の途中部分と接触し、該途中部分の内側への湾曲変形を規制する外周面を有する変形規制部が設けられているので、以下の効果を有する。即ち、弁頭部の表層部から軸受側に延出されて端部が固定された筒状シール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、筒状シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、筒状シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、少なくとも開弁状態で内部流体を通流しているとき、つまり使用状態において、内部流体通路を流れる内部流体からシール部の途中部分に作用する圧力を変形規制部で受けるようにすることができ、これによりシール部の途中部分が受ける圧力を減少させ得、シール部の耐久性を向上させることが可能となる。
【００６７】
また、本発明の請求項３に係る弁装置による場合には、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、少なくとも開弁状態で内部流体を通流しているときに、該弁枠体側シール部分と接触するリング状の弁枠体側ガイドが設けられ、該弁枠体側ガイドが弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持されるので、以下の効果を有する。即ち、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、弁枠体と軸部材との境界部分と、それに対応する弁枠体側シール部分との間にリング状の弁枠体側ガイドが設けられ、その弁枠体側ガイドが、少なくとも開弁状態で内部流体を通流しているときにおいて弁枠体側シール部分と接触するので、これにより弁枠体側シール部分に及ぶ圧力を低減させてシール部の耐久性を向上させ得る。また、弁枠体側ガイドが、弁枠体と移動部材とにより撓み変形可能に支持されているので、弁枠体側シール部分を変形部として利用することができる。
【００６８】
また、本発明の請求項５に係る弁装置による場合には、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、シール部の弁頭部背面側に回り込んでいる回り込み部分と弁頭部の背面側との間に、少なくとも開弁状態で内部流体を通流しているときに回り込み部分と接触するリング状の弁頭部側ガイドが設けられているので、以下の効果を有する。即ち、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、シール部の回り込み部分と弁頭部の背面側との間にリング状の弁頭部側ガイドが設けられ、その弁頭部側ガイドが、少なくとも開弁状態で内部流体を通流しているときにおいてシール部の回り込み部分と接触するので、回り込み部分に及ぶ圧力を低減させて、シール部の耐久性を向上させ得る。
【００６９】
また、本発明の請求項６に係る弁装置による場合には、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、上記軸部材に設けられ、少なくとも開弁状態で内部流体を通流しているときに、該シール部における両端間の途中部分と接触し、該途中部分の内側への変形を規制する外周面を備える変形規制部を有するとともに、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持された状態で設けられ、少なくとも開弁状態で内部流体を通流しているときに該弁枠体側シール部分と接触するリング状の弁枠体側ガイド、および、シール部の弁頭部背面側に回り込んでいる回り込み部分と弁頭部の背面側との間に設けられ、少なくとも開弁状態で内部流体を通流しているときに回り込み部分と接触するリング状の弁頭部側ガイドのうちの少なくとも一方を有するので、以下の効果を有する。即ち、弁頭部の表層部から軸受側に延出されて端部が固定されたシール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、シール部の途中部分が変形規制部にて規制され、また、シール部の弁枠体側シール部分および回り込み部分の少なくとも一方が該当するガイドにて規制されるので、シール部のほぼ全体が異常に変形することを抑制でき、これによりシール部の内側に一体に設けられる補強用膜を省くことが可能となる。特に、変形規制部に加えて、弁枠体側ガイドと弁頭部側ガイドの両方をも備えた構成にすると、シール部の各部での異常変形は、補強用膜を省略しても完全に防止することができる。
【００７０】
また、本発明の請求項９に係る弁装置による場合には、内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形する筒状シール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、前記シール部は、前記弁頭部の背面側に回り込んでいる回り込み部分と、弁頭部より小径の途中部分と、該途中部分から連続して拡径する弁枠体側シール部分とを有し、前記回り込み部分の径が拡大しながら前記弁頭部から離れるとともに、前記弁枠体側シール部分の径が拡大しながら前記軸受から離れて、弁体が開弁状態から閉弁状態に移動可能となっているとともに、軸部材のスライドに伴う回り込み部分および前記弁枠体側シール部分の径の拡大程度が、途中部分での径の拡大程度よりも大きいので、以下の効果が得られる。即ち、弁頭部の表層部から軸受側に延出されて端部が固定された筒状シール部までが一体形成されているので、弁頭部における隙間形成部を無くすことが可能となる。また、筒状シール部が該軸受と該軸部材との摺接する部分を内部流体通路から区画するので、軸受とこれにより支持される部分との摺接する部分が遮蔽される。更に、弁体は、その外側全体が隙間の無い一体構造となっていて、袋状に形成されているので、筒状シール部の開口端部のみを固定すればよく、固定箇所を少なくすることが可能な簡潔な構造となる。そして、更に、弁体が開弁状態から閉弁状態へ移動することに伴い、シール部の回り込み部分が弁頭部から離れるとともに、弁枠体側シール部分が軸受から離れるので、シール部の途中部分よりも端側の両端部が、軸部材のスライドに伴って傾きが変化し、シール部の変形部として機能するため、これによりシール部の変形部を両端に分散させることができ、結果としてシール部の径を小径に抑えることができ、これによりシール部の小型化が図れる。また、シール部の変形部を両端に分散させることにより、軸部材のスライド量も大きく設計することが可能となる。
【図面の簡単な説明】
【図１】本発明の弁装置を適用したサニタリー用の継手を示す縦断面図であり、閉弁状態を示す。
【図２】図１の継手が開弁状態となっているときを示す縦断面図である。
【図３】図１の継手の閉弁状態（図左側）と開弁状態（図右側）とを示す縦断面図である。
【図４】（ａ）は図１の継手に設けられた弁頭部側ガイドを示す縦断面図、（ｂ）は同弁枠体側ガイドを示す縦断面図である。
【図５】本発明の弁装置を適用したサニタリー用の他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図６】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図７】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図８】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図９】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図１０】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図１１】本発明の弁装置を適用したサニタリー用の更に他の継手における閉弁状態（図左側）と開弁状態（図右側）とを示す断面図である。
【図１２】従来例のサニタリー用継手を示す縦断面図であり、（ａ）は両継手が離間された状態を示し、（ｂ）は両継手が接続された状態を示す。
【図１３】従来例のサニタリー用継手の問題点の説明図である。
【符号の説明】
１　継手
２　弁枠体
３　内部流体通路
３ａ　第１接続口
３ｂ　第２接続口
４　スライド機構
５　軸部材
６　軸受
１０　弁体
１１　弁頭部
１２　シール部
１２Ａ　途中部分
１２Ｂ　弁枠体側シール部分
１２Ｃ　回り込み部分
１３　弁頭部側ガイド
１４　弁枠体側ガイド
１５　移動部材
１５ａ　段付部（追従機構）
２０　変形規制部
２２、２３、２４　段差部（追従機構）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve device suitably used for connecting a passage for a fluid, such as a food or a chemical, requiring cleanliness.
[0002]
[Prior art]
As the above-mentioned valve device, for example, a sanitary joint is known. As shown in FIGS. 12A and 12B, a female joint 101 having an internal fluid passage 102 and a male joint 111 having an internal fluid passage 112 are used for this joint. Each is connected to another fluid passage. The female joint 101 has an abutting surface 101a at its upper end, and the male joint 111 has an abutting surface 111a at its lower end. The two abutting surfaces 101a and 111a abut on the same axis. After the butting, the valve body 103 provided on the female joint 101 is slid away from the valve seat 104, and the valve body 113 provided on the male joint 111 is slid away from the valve seat 114. A connection state is established in which the passages 102 and 112 communicate with each other (the state shown in FIG. 12B). Conversely, the valve body 103 is brought into contact with the valve seat 104 and the valve body 113 is brought into contact with the valve seat 114 so as to be cut off, and by separating the butting surfaces 101a and 111a from each other, the internal fluid passages 102 and 112 are cut off. The separated state (the state shown in FIG. 12A) is obtained.
[0003]
The valve bodies 103 and 113 are slidably supported by shaft portions 105 and 115 provided thereon and bearings 106 and 116 supporting the shaft portions 105 and 115, respectively. A portion between the provided flange 107 and the bearing 106 is covered with the flexible film 108, and a portion between the flange 117 provided in the middle of the shaft portion 115 and the bearing 116 is covered with the flexible film 118. . When the flexible membranes 108 and 118 are in a connected state in which the internal fluid passages 102 and 112 communicate with each other, the fluid to be transferred enters the gap that is the sliding portion between the shafts 105 and 115 and the bearings 106 and 116. It is provided to prevent it from remaining.
[0004]
[Problems to be solved by the invention]
As shown in FIGS. 12 and 13 (showing the male joint 111 side), the above-mentioned flexible film 118 is provided between one of the divided shaft portions 115a obtained by dividing the shaft portion 115 into two parts and the flange 117. The other flexible film 108 is provided in the same manner while being sandwiched while being pressed by the other divided shaft portion 115b. This configuration is employed because it is difficult to directly fix the end of the flexible film 108 or the like to the shaft, and the shaft is divided and the space between the shafts is used as a fixing portion.
[0005]
Therefore, in the case of the conventional joint, since the joint X between the split shaft portion 115a and the flange 117 and the like is exposed to the internal fluid passage 112 and the like, the fluid to be transferred enters the joint X. There is a possibility that it will remain and there is room for improvement.
[0006]
Further, the valve bodies 103 and 113 have ring-shaped contact members 103b and 113b that are in contact with the valve seats 104 and 114 around the valve heads 103a and 113a at the distal ends, respectively. There is a gap forming portion between the contact members 103b and 113b in the portions 103a and 113a, and there is a possibility that the transferred fluid may enter and remain in the gap forming portion, and there is room for improvement.
[0007]
The present invention has been made in order to solve such a problem of the related art, and eliminates a gap forming portion in a valve head, and makes a gap between a bearing and a portion supported thereby simple. An object is to provide a valve device that can be shielded by a structure.
[0008]
[Means for Solving the Problems]
The valve device according to the first aspect of the present invention is a valve frame body provided with a first connection port at one end of an internal fluid passage and a second connection port at the other end, and the valve frame body includes the first connection port at the other end. A shaft member slidably provided in a direction in which the shaft member comes into contact with and separates from the connection port, a valve body attached to a distal end of the shaft member, a bearing slidably supporting a middle of the shaft member; A sliding mechanism for sliding the member, wherein the valve body contacts the peripheral portion of the first connection port by approaching the shaft member to the first connection port to close the first connection port. A head and an end extending from the valve head to the bearing side and having an end fixed so as to define a portion in sliding contact between the bearing and the shaft member from an internal fluid passage, and having an inner side as the shaft member slides. A cylindrical seal portion that bends and deforms, and the seal portion and at least the surface layer portion of the valve head are The shaft member is integrally formed of a synthetic resin, and at least when the internal fluid is flowing in the valve-open state, the shaft member contacts an intermediate portion between both ends of the seal portion that bends and deforms inward. It is characterized in that a deformation restricting portion having an outer peripheral surface for restricting the inward bending deformation of the intermediate portion is provided.
[0009]
In this valve device, since the portion from the surface layer of the valve head to the cylindrical seal portion extending to the bearing side and having the fixed end is integrally formed, the gap forming portion in the valve head is eliminated. It becomes possible. In addition, since the cylindrical seal section divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Further, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the cylindrical seal portion needs to be fixed, and the number of fixing points is reduced. Is possible. Further, when the internal fluid is flowing at least in the valve open state, that is, in the use state, the deformation restricting portion receives the pressure acting on the intermediate portion of the seal portion from the internal fluid flowing through the internal fluid passage. As a result, the pressure applied to an intermediate portion of the seal portion can be reduced, and the durability of the seal portion can be improved.
[0010]
A valve device according to a second aspect of the present invention is the valve device according to the first aspect, wherein the deformation restricting portion restricts inward bending deformation by coming into contact with the intermediate portion from a valve-closed state. I do.
[0011]
In this valve device, not only the valve is opened but also the valve is closed (a pipe or the like is connected to the second connection port and pressure is applied to the seal portion). Since the deformation restricting portion receives the pressure acting on the seal portion, the durability of the seal portion can be further improved.
[0012]
A valve device according to a third aspect of the present invention provides a valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end, and the valve frame body having the first connection port at the other end. A shaft member slidably provided in a direction in which the shaft member comes into contact with and separates from the connection port, a valve body attached to a distal end of the shaft member, a bearing slidably supporting a middle of the shaft member; A sliding mechanism for sliding the member, wherein the valve body contacts the peripheral portion of the first connection port by approaching the shaft member to the first connection port to close the first connection port. A head and an end extending from the valve head to the bearing side are fixed so that a portion where the bearing and the shaft member are in sliding contact with each other is separated from the internal fluid passage, and deformed as the shaft member slides. A seal portion to be formed, and the seal portion and at least a surface layer portion of the valve head are integrally formed of synthetic resin. The internal fluid is formed at least in a valve-open state between a boundary portion between the valve frame body and the shaft member, and a valve frame body-side seal portion from an end portion fixed to the valve frame body to a middle portion in the seal portion. A moving member that is provided with a ring-shaped valve frame-side guide that comes into contact with the valve frame-side sealing portion when flowing through, and that the valve frame-side guide moves in the sliding direction by sliding of the valve frame and the shaft member; And is supported so as to be able to bend and deform.
[0013]
In this valve device, since a portion extending from the surface layer portion of the valve head to the bearing side and extending to the seal portion having the fixed end portion is integrally formed, it is possible to eliminate the gap forming portion in the valve head. It becomes possible. In addition, since the seal portion divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Furthermore, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the seal portion needs to be fixed, and the number of fixing points can be reduced. Simple structure. Further, a ring-shaped valve frame body-side guide is provided between a boundary portion between the valve frame body and the shaft member and a corresponding valve frame body-side seal portion, and the valve frame body-side guide is at least in an open state. When the internal fluid is flowing through the valve body, it comes into contact with the valve frame-side sealing portion, thereby reducing the pressure applied to the valve frame-side sealing portion and improving the durability of the sealing portion. Further, since the valve frame body side guide is supported by the valve frame body and the movable member so as to be able to bend and deform, the valve frame body side seal portion can be used as a deformation portion.
[0014]
The valve device according to a fourth aspect of the present invention is the valve device according to the third aspect, wherein the valve frame supports the moving member while the shaft member slides from the valve-closed state to the valve-opened state. The shaft member supports the moving member from the middle of sliding from the valve-open state to the valve-closed state, and the moving member is in a non-moving state from being supported by the valve frame to being supported by the shaft member. A tracking mechanism is provided.
[0015]
In this valve device, the moving member supporting the valve frame body-side guide has a shorter moving amount than the sliding amount of the shaft member, which makes it possible to reduce the amount of bending of the valve frame body-side guide, The durability of the valve frame body side guide can also be improved.
[0016]
According to a fifth aspect of the present invention, there is provided a valve device in which a first connection port is provided at one end of an internal fluid passage, and a second connection port is provided at the other end. A shaft member slidably provided in a direction in which the shaft member comes into contact with and separates from the connection port, a valve body attached to a distal end of the shaft member, a bearing slidably supporting a middle of the shaft member; A sliding mechanism for sliding the member, wherein the valve body contacts the peripheral portion of the first connection port by approaching the shaft member to the first connection port to close the first connection port. A head and an end extending from the valve head to the bearing side are fixed so that a portion where the bearing and the shaft member are in sliding contact with each other is separated from the internal fluid passage, and deformed as the shaft member slides. A seal portion to be formed, and the seal portion and at least a surface layer portion of the valve head are integrally formed of synthetic resin. A ring that is formed and that comes into contact with the wraparound portion when the internal fluid is flowing at least in the valve-open state, between the wraparound portion that wraps around the valve head backside of the seal portion and the backside of the valve head. A valve head side guide is provided.
[0017]
In this valve device, since a portion extending from the surface layer portion of the valve head to the bearing side and extending to the seal portion having the fixed end portion is integrally formed, it is possible to eliminate the gap forming portion in the valve head. It becomes possible. In addition, since the seal portion divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Furthermore, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the seal portion needs to be fixed, and the number of fixing points can be reduced. Simple structure. Further, a ring-shaped valve head side guide is provided between the wraparound portion of the seal portion and the back side of the valve head, and the valve head side guide allows the internal fluid to flow at least in the valve open state. Since the contact portion comes into contact with the wraparound portion of the seal portion during the operation, the pressure applied to the wraparound portion can be reduced, and the durability of the seal portion can be improved.
[0018]
A valve device according to a sixth aspect of the present invention provides a valve frame in which a first connection port is provided at one end of an internal fluid passage, and a second connection port is provided at the other end. A shaft member slidably provided in a direction in which the shaft member comes into contact with and separates from the connection port, a valve body attached to a distal end of the shaft member, a bearing slidably supporting a middle of the shaft member; A sliding mechanism for sliding the member, wherein the valve body contacts the peripheral portion of the first connection port by approaching the shaft member to the first connection port to close the first connection port. A head and an end extending from the valve head to the bearing side are fixed so that a portion where the bearing and the shaft member are in sliding contact with each other is separated from the internal fluid passage, and deformed as the shaft member slides. A seal portion to be formed, and the seal portion and at least a surface layer portion of the valve head are integrally formed of synthetic resin. The seal member is provided on the shaft member, and at least when the internal fluid is flowing in the valve-open state, the seal portion comes into contact with an intermediate portion between both ends, and the inward deformation of the intermediate portion is restricted. And a boundary portion between the valve frame and the shaft member, between the end portion of the seal portion fixed to the valve frame body and the valve frame body-side seal portion from the middle portion. , Provided in a state supported by a valve frame and a moving member that moves in the sliding direction by sliding of the shaft member so as to be able to bend and deform, and at least when the internal fluid is flowing in the valve-opened state, the valve frame side A ring-shaped valve frame body side guide that comes into contact with the seal portion, and is provided between the wraparound portion that wraps around the back side of the valve head of the seal portion and the back side of the valve head. Flow through fluid Characterized in that it has at least one of the ring-shaped valve head side guide in contact with the wraparound portion when being.
[0019]
In this valve device, since a portion extending from the surface layer portion of the valve head to the bearing side and extending to the seal portion having the fixed end portion is integrally formed, it is possible to eliminate the gap forming portion in the valve head. It becomes possible. In addition, since the seal portion divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Furthermore, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the seal portion needs to be fixed, and the number of fixing points can be reduced. Simple structure. Further, the middle portion of the seal portion is regulated by the deformation regulating portion, and at least one of the seal portion and the wraparound portion of the seal portion is regulated by the corresponding guide. Can be suppressed from being abnormally deformed, thereby making it possible to omit the reinforcing film integrally provided inside the seal portion. In particular, if a configuration is provided that includes both the valve frame body side guide and the valve head side guide in addition to the deformation restricting section, abnormal deformation at each part of the seal section is completely prevented even if the reinforcing membrane is omitted. can do.
[0020]
A valve device according to a seventh aspect of the present invention is the valve device according to the sixth aspect, further comprising a valve frame-side guide and a valve head-side guide, and when the valve is in a closed state, the valve frame-side seal portion and the wraparound portion. When at least one of the guides is apart from the corresponding guide and the valve is in an open state, the valve frame body side seal portion presses the valve frame body side guide to bend and deform.
[0021]
In this valve device, at the time of the valve closing state, at least one of the seal portion and the wraparound portion of the seal portion separates from the corresponding guide. Further, when the valve is in the open state, the valve frame body side seal portion presses and deforms the valve frame body side guide, so that both ends on the end side than the middle portion of the seal portion are inclined with the sliding of the shaft member. It changes and functions as a deformed portion of the seal portion, so that the deformed portion of the seal portion can be dispersed at both ends, and as a result, the diameter of the seal portion can be suppressed to a small diameter, thereby reducing the size of the seal portion Can be achieved. Further, by dispersing the deformed portion of the seal portion at both ends, it is possible to design a large slide amount of the shaft member.
[0022]
The valve device according to an eighth aspect of the present invention is the valve device according to the first aspect, wherein the seal portion has a plurality of drum-shaped portions along a sliding direction of the shaft member.
[0023]
In this valve device, each of the plurality of drum-shaped portions is bent inward, so that the sliding amount of the shaft member can be designed to be extremely large.
[0024]
A valve device according to a ninth aspect of the present invention provides a valve frame having a first connection port provided at one end of an internal fluid passage and a second connection port provided at the other end, and the valve frame body having the first connection port provided therein. A shaft member slidably provided in a direction in which the shaft member comes into contact with and separates from the connection port, a valve body attached to a distal end of the shaft member, a bearing slidably supporting a middle of the shaft member; A sliding mechanism for sliding the member, wherein the valve body contacts the peripheral portion of the first connection port by approaching the shaft member to the first connection port to close the first connection port. A head and an end extending from the valve head to the bearing side are fixed so that a portion where the bearing and the shaft member are in sliding contact with each other is separated from the internal fluid passage, and deformed as the shaft member slides. A cylindrical seal portion, and the seal portion and at least the surface layer portion of the valve head are made of synthetic resin. The seal portion is formed on the body, and the seal portion includes a wraparound portion wrapping around the back side of the valve head, a middle portion having a smaller diameter than the valve head, and a valve frame continuously expanding in diameter from the middle portion. Having a body-side seal portion, while moving away from the valve head while increasing the diameter of the wraparound portion, separating from the bearing while increasing the diameter of the valve frame body-side seal portion, and causing the valve body to move from the valve-open state. It is movable in the valve-closed state, and the degree of increase in the diameter of the wraparound part and the valve frame body side seal part accompanying the sliding of the shaft member is larger than the degree of increase in the diameter in the middle part. .
[0025]
In the valve device according to the ninth aspect, a boundary portion between the wraparound portion and the middle portion and a boundary portion between the valve frame body side seal portion and the middle portion function as deformation portions that deform as the shaft member slides. It is preferable to adopt such a configuration (claim 10).
[0026]
In such a valve device, since a portion from the surface layer of the valve head to the cylindrical seal portion extending to the bearing side and having an end fixed is integrally formed, a gap forming portion in the valve head is provided. Can be eliminated. In addition, since the cylindrical seal section divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Further, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the cylindrical seal portion needs to be fixed, and the number of fixing points is reduced. Is possible. Further, as the valve element moves from the open state to the valve closed state, the wraparound part of the seal part separates from the valve head, and the valve frame body side seal part separates from the bearing. Since the inclination of the both ends on the end side changes as the shaft member slides and functions as a deformed portion of the seal portion, the deformed portion of the seal portion can be dispersed at both ends. The diameter of the part can be reduced to a small diameter, and the size of the seal part can be reduced. Further, by dispersing the deformed portion of the seal portion at both ends, it is possible to design a large slide amount of the shaft member.
[0027]
The valve device according to an eleventh aspect of the present invention is the valve device according to the third, fourth, seventh, eighth, ninth or tenth aspect, wherein the valve device is formed at a position closest to an end of the seal portion fixed to the valve frame. From the inner curved portion to the end portion of the valve frame so that the end portion is located closer to the first connection port than the bearing portion of the second connection port. The body-side guide regulates the seal portion.
[0028]
In this valve device, the portion from the bearing side of the second connection port to the inner curved portion formed at the position closest to the end of the seal portion fixed to the valve frame body is continuously connected to the first connection port. As a result, the formation of a depression that stagnates the internal fluid flowing through the internal fluid passage is eliminated. Further, since there is no formation of the above-mentioned dent, it is possible to prevent a decrease in cleaning efficiency due to the dent when performing valve cleaning.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0030]
FIG. 1 is a longitudinal sectional view showing a sanitary joint to which the valve device of the present invention is applied, and shows a valve closed state. FIG. 2 is a longitudinal sectional view showing a state where the joint is in a valve open state, and FIG. 3 is a longitudinal sectional view showing the valve open state (left side) and the valve open state (right side) of the joint.
[0031]
The joint 1 has a valve frame 2 having an internal fluid passage 3, a shaft member 5 slid by a slide mechanism 4, and a bearing that supports a part of the shaft member 5 and forms a part of the valve frame 2. 6 and a valve element 10 attached to the tip of the shaft member 5.
[0032]
The valve frame 2 is provided with a first connection port 3a at one end (upper side) of the internal fluid passage 3 and a second connection port 3b at the other end (right side). The first connection port 3a is detachably connected to, for example, another joint (not shown) connected to the transfer destination (or transfer source), and the second connection port 3b is connected to, for example, the transfer source (or transfer destination). ) Is connected to a pipe (not shown) such as a hose.
[0033]
The shaft member 5 is provided inside the valve frame body 2 and is slidable in a direction of coming into contact with and separating from the first connection port 3a by a slide mechanism 4 provided on the base end side. A part of the shaft member 5 is slidably supported by a bearing 6. As the slide mechanism 4, a known means such as an air actuator, an electromagnet or a manual handle is used.
[0034]
On the outer side of the shaft member 5, a position from a position slightly closer to the base end (lower side in the figure) than the tip (upper end in the figure) to a position slightly closer to the distal side than the portion supported by the bearing 6 is described. The deformation restricting portion 20 is provided integrally with the shaft member 5 therebetween. The deformation restricting portion 20 has a radius longer than other portions of the shaft member 5, and has a curved portion 21 whose outer peripheral surface is curved along the axial direction from the distal end side, and functions as a part of a following mechanism 3. There are two step portions 22, 23, 24, and the outer diameters of the step portions 22, 23, 24 are set at different values along the sliding direction. Specifically, the outer diameter of the step 22 is the smallest, the outer diameter of the step 24 is the largest, and the outer diameter of the step 23 is set between them. Note that, instead of the bending portion 21, the deformation restricting portion 20 has a shape in which the outer peripheral surface has substantially the same diameter, or a shape in which the distal end side of the outer peripheral surface is gradually reduced or enlarged in diameter from the base end side, or another shape. The outer peripheral surface can have any shape.
[0035]
The valve body 10 is attached to the distal end portion of the shaft member 5 as described above, and has a valve head 11 having a surface layer portion 11a and an attachment portion 11b, and extends from the surface layer portion 11a of the valve head 11 to the bearing 6 side. And a protruding cylindrical seal portion 12. The mounting portion 11b is made of metal or another non-flexible material, and the tip of the shaft member 5 is screwed to the mounting portion 11b. The entire surface layer portion 11a and the seal portion 12 are made of synthetic resin, for example. It is formed of Teflon (PTFE: ethylene tetrafluoride resin) by integral molding. The valve head 11 closes the first connection port 3a when the shaft member 5 is moved to the advance limit position where the shaft member 5 comes into contact with the peripheral portion 3c of the first connection port 3a by approaching the first connection port 3a. By sliding the shaft member 5 away from the first connection port 3a (see FIG. 1), the first connection port 3a is opened from the periphery 3c of the first connection port 3a (see FIG. 2). . Here, the valve-open state refers to a state in which the shaft member 5 has retreated to the retreat limit position by the separation slide.
[0036]
A seal portion 12 extends from the maximum diameter portion 11c of the valve head 11 to the bearing 6 side and is formed in a bag shape, and the base end side of the seal portion 12 is an open end. The entire periphery of the opening end is fixed by being sandwiched between a part of the valve frame body 2 divided into a plurality of parts and a boundary surface 2 a of the bearing 6. As a result, the seal portion 12 divides a portion where the bearing 6 and the shaft member 5 are in sliding contact from the internal fluid passage 3. In addition, it is preferable that the opening area of the valve frame body 2 for fixing the seal portion 12 is substantially equal to the opening area of the first connection port 3a.
[0037]
The outer peripheral portion 14a of the valve frame body side guide 14 shown in FIG. 4B is also sandwiched by the boundary surface 2a. The valve frame body side guide 14 regulates the deformation of a valve frame body side sealing portion 12B described later (see FIG. 3), and is a circular ring made of an elastic material such as rubber, for example. The peripheral side has a substantially triangular shape, and the outer peripheral side has a substantially constant thickness. The inner peripheral portion 14b having a substantially triangular cross section is formed between the step 22 and the concave cutout 6b provided inside the boundary surface 2a of the valve frame 2, that is, the deformation restricting portion 20 and the valve frame. It is arranged in a recess at the boundary of the body 2. A circular ring-shaped moving member 15 is disposed on the bearing 6 side of the valve frame body side guide 14.
[0038]
The moving member 15 has a stepped portion 15a functioning as a part of a follow-up mechanism in which an inner peripheral side of a lower end is cut out (see FIG. 3). . Specifically, when the shaft member 5 is at the advance limit position, the stepped portion 15a of the moving member 15 is engaged with the portion between the step portions 23 and 24, and the lower end is floating from the notch portion 6b. It becomes. When the shaft member 5 retreats from that state, the moving member 15 descends accordingly. When the shaft member 5 descends to a certain position, the lower end of the moving member 15 engages (contacts) with the notch 6b. become. Thereafter, even if the shaft member 25 is further slid away to the retreat limit position, the moving member 15 is restricted by the notch 6b and enters the non-moving state. Furthermore, when the portion between the step portions 23 and 24 becomes higher than the bottom surface of the notch portion 6b by performing the approach slide from the retreat limit position to the front side, the stepped portion 15a of the moving member 15 Then, the lower end floats from the notch 6b. Such a follow-up movement of the moving member 15 is similarly repeated with the sliding of the shaft member 5.
[0039]
The follow-up movement of the moving member 15 allows the valve frame body side guide 14 to be deformed. Specifically, in the valve closed state, the lower end side of the valve frame body side guide 14 is engaged between the step portions 22 and 23 as shown on the left side of FIGS. Thus, it is possible to compressively deform, but not to deform the shape (bending deformation). On the other hand, in the valve open state, as shown on the right side of FIGS. 2 and 3, the movement of the moving member 15 causes the steps 22 and 23 to drop, and a gap is formed below the valve frame side guide 14. Since it is formed, the valve frame body-side guide 14 can be deformed downward by being pressed downward at the lower end portion of the seal portion 12 that is deformed by being opened.
[0040]
On the back side of the valve head 11, a valve head side guide 13 shown in FIG. The valve head side guide 13 regulates the deformation of a wraparound portion 12C described later (see FIG. 3), and is a circular ring made of an elastic material such as rubber, for example. It has a triangular shape with a thick outer periphery and a thin outer periphery, and the tip end of the shaft member 5 is inserted inside the valve head side guide 13. The valve head side guide 13 may be formed integrally with the non-flexible mounting portion 11b.
[0041]
The seal portion 12 is deformed as the shaft member 5 slides. In the present embodiment, as shown in FIG. 3, the deformation of the seal portion 12 is caused when the shaft member 5 (or the valve body 10) is in the valve-closed state at the advance limit position (the position shown in FIG. 1). The portion 12A (excluding the wraparound portion 12C of the seal portion 12 and the valve frame body side seal portion 12B) is in contact with the outer peripheral surface of the deformation restricting portion 20, substantially the curved portion 21, and the outer peripheral surface of the deformation restricting portion 20 Even when the shaft member 5 is in the valve open state where the shaft member 5 is at the retreat limit position (the position shown in FIG. 2), that is, regardless of the valve open / closed state, the outer peripheral surface of the deformation restricting portion 20 It remains in contact, and remains in a shape corresponding to the shape of the outer peripheral surface (however, a slight change in shape accompanies a change in the contact position with the deformation restricting portion 20). The wrap-around portion 12 </ b> C of the seal portion 12 wrapping around the back side of the valve head 11 contacts the valve head guide 13 when the valve is in the open state, and corresponds to the outer peripheral surface of the valve head guide 13. With the change in the shape, the entire area from the wraparound portion 12C to the middle portion 12A comes into contact with the deformation regulating portion 20, and the shape conforms to the shape of the outer peripheral surface of the deformation regulating portion 20. Then, as the shaft member 5 moves from the valve-open state to the valve-closed state, the wraparound portion 12C moves away from the valve head side guide 13 while expanding its diameter away from the axis of the shaft member. Therefore, on the valve head 11 side of the seal portion 12, a boundary portion 12 </ b> E between the wraparound portion 12 </ b> C contacting the valve head guide 13 and the middle portion 12 </ b> A contacting the deformation restricting portion 20 is curved and deformed. Further, the valve frame-side sealing portion 12B from the end portion fixed at the boundary surface 2a of the sealing portion 12 to the middle portion 12A is a valve whose movable member 15 is lowered by the retreat of the shaft member 5 so as to be deformable. The frame body side guide 14 is pressed downward. That is, the inner peripheral surface side of the valve frame body side guide 14 is bent and deformed in a state where the inner peripheral surface side is pressed downward, and comes into contact with a part of the outer peripheral surface of the valve frame body side guide 14. In the boundary portion 12E between the valve frame body side sealing portion 12B and the middle portion 12A, a gap is formed on the lower side, and a portion having the gap is in a curved state. On the other hand, as the shaft member 5 moves from the valve-open state to the valve-closed state, the valve frame body-side seal portion 12B moves away from the bearing 6 while expanding its diameter away from the shaft center of the shaft member. Along with this, the valve frame body side guide 14 that has been bent and deformed returns to the original state. Note that, in this paragraph, the state where the pressure from the fluid does not act, that is, the shape of each part of the seal portion 12 before the connection to the pipe is described.
[0042]
That is, in the seal portion 12 of the present embodiment, the intermediate portion 12A comes into contact with the deformation regulating portion 20 and has a shape corresponding to the peripheral surface thereof regardless of the valve open / closed state. do not do. In contrast, the boundary portion 12E between the wraparound portion 12C and the middle portion 12A is curved and deformed, and the inclination of the wraparound portion 12C changes. Similarly, a boundary portion 12F between the valve frame body-side seal portion 12B and the middle portion 12A is curved and deformed, and the inclination of the valve frame body-side seal portion 12B changes. In other words, both ends on the end side of the intermediate portion 12A of the seal portion 12, particularly the boundary portion 12E between the wraparound portion 12C and the intermediate portion 12A, and the boundary portion 12F between the valve frame body side seal portion 12B and the intermediate portion 12A are deformed. Functions as a unit. When the valve body 10 is in the retreat limit position (that is, in the valve-opened state), the seal portion 12 is located closer to the bearing 6 side than the portion connected to the valve head 11a, and the valve head 11a The valve frame side guide 14 is designed so as not to be folded back to the side, and when the valve frame side guide 14 is in the valve open state (when no fluid pressure acts), as described above, the moving member 15 The shape is designed so as to be in the above-mentioned shape state even if the shape deformation to be bent downward due to the movement of. As a matter of course, even when a fluid flows through the internal fluid passage 3, the above-mentioned shape is maintained.
[0043]
Therefore, in the joint 1 of the first embodiment, the valve element 10 extends from the valve head 11 to the bearing 6 side and is integrally formed up to the cylindrical seal portion 12 fixed to the valve frame 2. Therefore, the gap forming portion in the valve head 11 can be eliminated without using the ring-shaped contact members (103b, 113b) as in the related art. In addition, since the seal portion 12 partitions the portion of the bearing 6 and the shaft member 5 in sliding contact from the internal fluid passage 3, the portion of the bearing 6 and the shaft member 5 supported by the sliding contact can be shielded. Furthermore, since the valve element 10 has an integral structure with no gap on its entire outside and is formed in a bag shape, only the opening end on the base end side of the seal portion 12 needs to be fixed. Can be reduced to a simple structure.
[0044]
In the first embodiment, the pressure acting on the intermediate portion 12A from the internal fluid flowing through the internal fluid passage 3 in the valve-open state in which the fluid is connected to the pipe, that is, in the use state, is restricted. The pressure can be received at the portion 20, whereby the pressure applied to the intermediate portion 12 </ b> A can be reduced, and the durability of the seal portion 12 can be improved. Further, a ring-shaped valve head side guide 13 is provided between the wraparound portion 12C of the seal portion 12 and the back side of the valve head 11a. , The pressure applied to the wraparound portion 12C can be reduced, and the durability of the seal portion 12 can be improved. Further, a ring-shaped valve frame body side guide 14 is provided between the boundary between the valve frame body 2 and the shaft member 5 and the corresponding valve frame body side seal portion 12B, and the valve frame body side guide 14 is opened. Since the valve frame-side sealing portion 12B is received in the valve state, the pressure applied to the valve frame-side sealing portion 14 can be reduced, thereby improving the durability of the sealing portion 12. In addition, since the valve frame body side guide 14 is supported by the valve frame body 2 and the moving member 15 so as to be able to bend and deform, the valve frame body side seal portion 12B can be used as a deformable portion.
[0045]
Further, in the present embodiment, when the valve is closed, the wraparound portion 12C of the seal portion 12 is separated from the valve head side guide 13, and when the valve is open, the valve frame body side seal portion 12B is engaged with the valve frame side guide 14. In other words, the wrap-around portion 12C is separated from the valve head 11 while the diameter of the wraparound portion 12C is increased, and the valve frame body-side seal portion 12B is separated from the bearing 6 while the diameter of the valve frame-side seal portion 12B is increased. Is movable from the valve-open state to the valve-closed state, and the degree of increase in the diameter of the wraparound portion 12C and the valve frame body side seal part 12B due to the sliding of the shaft member 5 is the degree of increase in the diameter in the middle part 12A. Since both ends of the seal portion 12 on the end side of the intermediate portion 12A change in inclination as the shaft member 5 slides and function as deformation portions of the seal portion 12, By the deformation of the seal portion 12 can be dispersed to both ends, the result diameter of the seal portion 12 can be suppressed to a small diameter as, thereby downsizing of the seal portion 12 can be reduced. Further, by dispersing the deformed portion of the seal portion 12 at both ends, it is possible to design the slide amount of the shaft member 5 to be large.
[0046]
In the above-described embodiment, when the valve is in the closed state, the wraparound portion 12C of the seal portion 12 is separated from the valve head side guide 13. However, the present invention is not limited to this. When the sealing portion 12B of the sealing portion 12 is separated from the guide 14 on the valve frame side, or when the valve is in a closed state, the wraparound portion 12C of the sealing portion 12 is separated from the guide 13 on the valve head side and the valve frame side. The seal portion 12B may be separated from the valve frame body side guide 14. Further, the valve head side guide 13 may be movable like the valve frame body side guide 14 so that the wraparound portion 12C can be supported by the valve head side guide 13 when the valve is closed.
[0047]
In the above-described embodiment, the wraparound portion 12C is brought into contact with the valve head side guide 13 by setting the valve to the open state (when the pressure of the fluid is not applied). However, the present invention is not limited to this. Absent. For example, when the shaft member 5 is in the various sliding positions and the pipe is opened without being connected to the valve device, the wraparound portion 12C does not contact the valve head side guide 13 and Is connected to the valve device to open the valve, that is, at least when the pressure of the internal fluid acts, the wraparound portion 12C may be designed to contact the valve head side guide 13.
[0048]
In the above-described embodiment, the valve frame-side seal portion 12B presses the valve frame-side guide 14 to bend and deform by setting the valve to the open state (when no fluid pressure is applied). The present invention is not limited to this. For example, when the shaft member 5 is in the various sliding positions and the valve is opened without connecting the pipe to the valve device, the valve frame-side seal portion 12B does not contact the valve frame-side guide 14, When the pipe is connected to the valve device to open the valve, that is, at least when the pressure of the internal fluid acts, the valve frame-side sealing portion 12B presses the valve frame-side guide 14 to bend and deform. May be.
[0049]
In the above-described embodiment, the middle portion 12A is brought into contact with the deformation restricting portion 20 irrespective of the valve opening / closing state (when no fluid pressure is applied). However, the present invention is not limited to this. Absent. For example, when the pipe is not connected to the valve device and is opened while the shaft member 5 is in various sliding positions, the middle portion 12A does not contact the deformation restricting portion 20 and the pipe is connected to the valve device. When the valve is in the open state, that is, at least when the pressure of the internal fluid acts, the intermediate portion 12A may be designed to contact the deformation restricting portion 20.
[0050]
In the above-described embodiment, the deformation regulating portion 20 regulates the middle portion 12A, the valve frame body side guide 14 regulates the valve frame body side sealing portion 12B, and the valve head side guide 13 regulates the wraparound portion 12C. However, the present invention is not limited to this. For example, the configuration may include at least one of the valve frame body-side guide 14 and the valve frame body-side seal portion 12B in addition to the deformation restricting portion 20. Even with such a configuration, since the seal portion 12 does not break even when subjected to the pressure of the fluid flowing through the internal fluid passage 3, there is no need to separately provide a reinforcing film on the inside, and the seal portion 12 alone can be used. It is possible to seal. The reason is that even if one of the valve frame body side guide 14 and the valve head side guide 13 is omitted, most of the seal portion 12 can be received by the other guide and the deformation restricting portion 20, and the omitted guide receives. This is because the area of the supposed seal portion 12 is small and hard to break. However, in the case of a valve device in which the area becomes large, in addition to the deformation restricting portion 20, a configuration including both the valve frame body side guide 14 and the valve head side guide 13 is adopted. This is preferable from the viewpoint of preventing breakage of the steel. Further, when there is a possibility that the seal portion 12 is broken, a reinforcing film may be separately provided in a portion where the seal portion 12 is likely to be broken or inside the entire region of the seal portion 12.
[0051]
In the above-described embodiment, the deformation restricting portion 20 is formed integrally with the shaft member 5, but the present invention is not limited to this, and the deformation restricting portion may be formed separately from the shaft member. Even in this case, the boundary between the deformation restricting portion and the shaft member is separated from the internal fluid passage 3 by the seal portion.
[0052]
Further, in the case of the present embodiment, since the sealing portion is cylindrical, for example, a conical diaphragm valve (40 in the publication) disclosed in Japanese Patent Application Laid-Open No. H10-205628 is used. There are the following advantages as compared with the case of using a valve (1 in the publication) having a conical diaphragm portion (2 in the publication) disclosed in Japanese Unexamined Patent Application Publication No. 2002-122253. That is, the Teflon has an extremely low elongation rate as compared with rubber or the like. When such a synthetic resin is used instead of the cylindrical seal portion and a substantially conical diaphragm whose diameter gradually increases from the valve head 11a toward the bearing 6 is formed as the seal portion, the shaft member 5 may be used. The amount of sliding depends on the degree of inclination of the diaphragm, so that a diaphragm having a diameter much larger than the diameter of the pipe is required to make the amount of sliding equal to, for example, 25% of the diameter of the pipe.
[0053]
Therefore, if a cylindrical seal portion is used as in the present embodiment, the expansion and contraction length can be made longer than that of a diaphragm having the same diameter. That is, by extending the cylindrical seal portion in the axial direction, the distance of the portion that expands and contracts becomes longer, and the expansion and contraction length becomes longer even when a resin or the like having a very low elongation rate such as Teflon is used. Therefore, it can be formed smaller in diameter than the diaphragm. In addition, as shown in FIG. 5, when a configuration is provided in which a plurality of inwardly curved parts 12 </ b> D, in the illustrated example, two drum-shaped parts 12 </ b> D are provided in the middle part 12 </ b> A, the expansion and contraction length becomes longer.
[0054]
In the case of a factory facility that rearranges a pipeline under a natural flow, dozens of valve devices as described above are collectively installed on the same plane. In such a factory facility, by using a cylindrical seal portion as in the present invention, the diameter can be made smaller than in the case of using a diaphragm, so that the installation area of the factory facility can be reduced.
[0055]
Further, by forming the seal portion in a cylindrical shape, the diameter of the cylindrical seal portion can be made substantially the same as the pipe diameter. It is conceivable to reduce the diameter of the diaphragm by bending and using the diaphragm. However, the bent portion of the diaphragm becomes concave, and the internal fluid remains at that portion, which is not preferable.
[0056]
Since the valve device of the first embodiment uses the cylindrical seal portion, the valve device can be opened and closed without being bent, and is connected to the valve head 11a of the seal portion 12 as described above. From the portion to the end (lower end) fixed at the boundary surface 2a, the bearing 6 side is continuously located closer to the bearing 6 side, and as shown in FIGS. 1 and 2, the lower end is the second connection port. Because it is located closer to the first connection port 3a than the bearing-side portion, the occurrence of the concave portion is suppressed to prevent the remaining of the internal fluid, thereby improving the cleaning performance, that is, the performance of easily washing the internal fluid. The ability to reduce residual cleaning fluid can be improved. However, the present invention can be applied not only to the cylindrical seal portion having the above advantages but also to a diaphragm-shaped seal portion in the case of the configuration including only the valve frame body side guide. Of course.
[0057]
Further, in the above-described embodiment, when the valve body is at the retreat limit position where the first connection port 3a is in the open state with the sliding of the shaft member 5, the cylindrical seal portion 12 is smoothly curved inward. Although designed to deform, the invention is not so limited. For example, the seal portion 12 may be designed so that a part of the seal portion 12 in the axial direction bends and expands inwardly or outwardly in a cross-shaped “C” shape. However, even in such a case, the bearing 6 is continuously located closer to the bearing 6 than the bending and stretching portion so that the fluid can hardly be retained and can be prevented from remaining, and the cleaning performance is excellent. It is preferable to design so that
[0058]
In addition, when the seal portion bends and expands in the shape of the cross-section “C”, the seal portion has an inner angle of the bent portion when the valve body is at the retreat limit position where the first connection port 3a is opened. When the minimum is obtained, it is preferable that the dimensions of each part are determined, and the dimensions at the time of designing or cutting of the mold are determined based on the dimensions, and the die is manufactured. In this way, the bent portion of the seal portion does not generate internal stress when the valve body is at the retreat limit position, and prevents cracks or breakage due to stress concentration even when repeatedly subjected to deformation. Because you can.
[0059]
Alternatively, when the valve element is in the retreat limit position, that is, when the inner angle of the bent portion is minimum, the valve element is in the forward limit position in which the first connection port 3a is closed, that is, the inner angle of the bent portion is maximum. It is preferable that the dimensions of each part are determined at an angle between the times and the dimensions of the mold are determined or the dimensions at the time of cutting are determined based on the dimensions, and the seal part is produced. In this way, the bent portion of the seal portion reduces the compressive force when the valve element is at the retreat limit position, and reduces the tensile force when the valve element is at the forward limit position. This is because cracking or breakage due to stress concentration can be more effectively prevented even if it is received. In this case, the angle for determining the dimensions of each part may be determined empirically.
[0060]
Further, in the above-described embodiment, the cylindrical seal portion 12 in which the middle portion 12A curves gently inward is used, but the present invention is not limited to this. For example, as shown in FIGS. 5 to 10, in the valve-open state, a seal portion having an outwardly curved portion in the middle portion 12 </ b> A or the valve frame-side seal portion 12 </ b> B, or as shown in FIG. In this state, a seal portion having a portion on the valve frame-side seal portion 12B side of the intermediate portion 12A that is further greatly curved may be used. In the case of the illustrated example, since only the deformation restricting portion 20 is provided on the shaft member 5, a reinforcing film 26 is provided inside the Teflon film 25 (corresponding to the above 12) as the seal portion 12. It is configured separately. Note that a portion 26a indicated by a broken line inside the film 26 is a reinforcing member such as cloth.
[0061]
In the case of a seal portion having a plurality of drum-shaped portions 12D as shown in FIG. 5 described above, two drum-shaped portions 12D in the illustrated example, as described above, the individual drum-shaped portions 12D are curved and deformed inward, and the expansion and contraction length becomes longer. Therefore, the sliding amount of the shaft member 5 can be designed to be extremely large. In addition, when a seal portion as shown in FIGS. 6 to 11 is used, at least a part of the seal portion is regulated by the deformation regulating portion 20, so that the durability of the seal portion can be improved.
[0062]
Further, in the above-described embodiment, the moving member and the follow-up mechanism (steps 22 to 24, stepped portion 15a, and the like) for bending and deforming the guide are provided for the valve frame body guide. Similar moving members and following mechanisms may be provided not only on the guide side but also on the valve head side guide.
[0063]
In the above-described embodiment, the surface layer 11a of the valve head connected to the seal portion is formed of Teflon, and the mounting portion 11b is formed of a different material. However, the present invention is not limited to this, and the valve head and the seal are not limited thereto. The entire part may be formed of the same material such as Teflon.
[0064]
Further, in the above-described embodiment, Teflon is used as the synthetic resin of the valve body, but the present invention is not limited to this, and a general synthetic resin having flexibility may be used. In particular, in the case of fluids such as foods and chemicals, Teflon, PFA (ethylene tetrafluoride / perfluoroalkoxyethylene copolymer resin) or FEP (ethylene tetrafluoride / hexafluoropropylene copolymer resin) having excellent chemical resistance ) Is preferably used.
[0065]
Further, in the above-described embodiment, the present invention is applied to a sanitary joint, but the present invention is not limited to this, and can be widely applied to other various joints or valves that perform opening and closing operations.
[0066]
【The invention's effect】
As described above in detail, in the case of the valve device according to claim 1 of the present invention, a valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end is provided. A shaft member provided inside the valve frame so as to be slidable in a direction of coming into contact with and separating from the first connection port, a valve body attached to a tip end of the shaft member, and a middle of the shaft member. And a slide mechanism for sliding the shaft member. The valve body contacts the peripheral portion of the first connection port by approaching the shaft member to the first connection port. A valve head that closes the first connection port, and an end extending from the valve head to the bearing side so as to partition a portion in sliding contact between the bearing and the shaft member from the internal fluid passage. A cylindrical seal portion fixed and curved inwardly deformed as the shaft member slides; And at least a surface portion of the valve head are integrally formed of a synthetic resin, and the seal member is formed in the shaft member so as to bend inwardly at least when an internal fluid flows in an open state. Is provided with a deformation restricting portion having an outer peripheral surface for restricting the inward bending deformation of the midway portion in contact with the midway portion between the two ends. That is, since the portion from the surface layer portion of the valve head to the cylindrical seal portion extending to the bearing side and having the fixed end portion is integrally formed, it is possible to eliminate the gap forming portion in the valve head. In addition, since the cylindrical seal section divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Further, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the cylindrical seal portion needs to be fixed, and the number of fixing points is reduced. Is possible. Further, when the internal fluid is flowing at least in the valve open state, that is, in the use state, the deformation restricting portion receives the pressure acting on the intermediate portion of the seal portion from the internal fluid flowing through the internal fluid passage. As a result, the pressure applied to an intermediate portion of the seal portion can be reduced, and the durability of the seal portion can be improved.
[0067]
In the valve device according to claim 3 of the present invention, a valve frame body provided with a first connection port at one end of the internal fluid passage and a second connection port at the other end, and the valve frame body , A shaft member slidably provided in a direction of coming and going with respect to the first connection port, a valve body attached to a distal end of the shaft member, and slidably supporting a middle of the shaft member. And a slide mechanism that slides the shaft member. The valve body contacts the peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port. A valve head having a valve head to be closed, and an end fixed to define a portion extending from the valve head toward the bearing and slidingly contacting the bearing and the shaft member from an internal fluid passage; And a seal portion that is deformed with the sliding of the valve head, and at least a surface layer of the seal portion and the valve head. Are integrally formed of a synthetic resin, at least between the boundary between the valve frame and the shaft member and the valve frame-side sealing portion from the end fixed to the valve frame to the middle of the sealing portion. When the internal fluid is flowing in the open state, a ring-shaped valve frame-side guide is provided which comes into contact with the valve frame-side sealing portion, and the valve frame-side guide is moved by sliding the valve frame and the shaft member. Since it is flexibly supported by the moving member that moves in the sliding direction, it has the following effects. That is, since the part extending from the surface layer of the valve head to the bearing side and the seal part whose end is fixed is integrally formed, it is possible to eliminate the gap forming part in the valve head. In addition, since the seal portion divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Furthermore, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the seal portion needs to be fixed, and the number of fixing points can be reduced. Simple structure. Further, a ring-shaped valve frame body-side guide is provided between a boundary portion between the valve frame body and the shaft member and a corresponding valve frame body-side seal portion, and the valve frame body-side guide is at least in an open state. When the internal fluid is flowing through the valve body, it comes into contact with the valve frame-side sealing portion, thereby reducing the pressure applied to the valve frame-side sealing portion and improving the durability of the sealing portion. Further, since the valve frame body side guide is supported by the valve frame body and the movable member so as to be able to bend and deform, the valve frame body side seal portion can be used as a deformation portion.
[0068]
In the valve device according to the fifth aspect of the present invention, a valve frame body provided with a first connection port at one end of the internal fluid passage and a second connection port at the other end, and the valve frame body , A shaft member slidably provided in a direction of coming and going with respect to the first connection port, a valve body attached to a distal end of the shaft member, and slidably supporting a middle of the shaft member. And a slide mechanism that slides the shaft member. The valve body contacts the peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port. A valve head having a valve head to be closed, and an end fixed to define a portion extending from the valve head toward the bearing and slidingly contacting the bearing and the shaft member from an internal fluid passage; And a seal portion that is deformed with the sliding of the valve head, and at least a surface layer of the seal portion and the valve head. When the internal fluid is flowing at least in a valve-open state between the wraparound portion that is formed integrally with the synthetic resin and wraps around the back side of the valve head of the seal portion and the back side of the valve head. Since the ring-shaped valve head side guide that comes into contact with the wraparound portion is provided, the following effects are obtained. That is, since the part extending from the surface layer of the valve head to the bearing side and the seal part whose end is fixed is integrally formed, it is possible to eliminate the gap forming part in the valve head. In addition, since the seal portion divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Furthermore, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the seal portion needs to be fixed, and the number of fixing points can be reduced. Simple structure. Further, a ring-shaped valve head side guide is provided between the wraparound portion of the seal portion and the back side of the valve head, and the valve head side guide allows the internal fluid to flow at least in the valve open state. Since the contact portion comes into contact with the wraparound portion of the seal portion during the operation, the pressure applied to the wraparound portion can be reduced, and the durability of the seal portion can be improved.
[0069]
In the valve device according to claim 6 of the present invention, a valve frame body provided with a first connection port at one end of the internal fluid passage and a second connection port at the other end, and the valve frame body , A shaft member slidably provided in a direction of coming and going with respect to the first connection port, a valve body attached to a distal end of the shaft member, and slidably supporting a middle of the shaft member. And a slide mechanism that slides the shaft member. The valve body contacts the peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port. A valve head having a valve head to be closed, and an end fixed to define a portion extending from the valve head toward the bearing and slidingly contacting the bearing and the shaft member from an internal fluid passage; And a seal portion that is deformed with the sliding of the valve head, and at least a surface layer of the seal portion and the valve head. Are formed integrally with a synthetic resin, and are provided on the shaft member, and at least when the internal fluid is flowing in the valve-opened state, it comes into contact with the middle part between both ends of the seal portion, and the middle part Having a deformation restricting portion provided with an outer peripheral surface for restricting inward deformation of the valve frame, a boundary portion between the valve frame body and the shaft member, and a valve frame from an end fixed to the valve frame body to a middle portion in the seal portion. Between the body-side seal portion, provided in a state supported by the valve frame body and a moving member that moves in the sliding direction by sliding of the shaft member so as to be flexibly deformable, and at least the internal fluid flows in the valve-open state. A ring-shaped valve frame-side guide that comes into contact with the valve frame-side sealing portion when it is located, and is provided between the wraparound portion that wraps around the valve head rear side of the seal portion and the back side of the valve head. , At least open Since at least one of the ring-shaped valve head side guide in contact with the wraparound portion when flowing through the internal fluid state has the following effects. That is, since the part extending from the surface layer of the valve head to the bearing side and the seal part whose end is fixed is integrally formed, it is possible to eliminate the gap forming part in the valve head. In addition, since the seal portion divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Furthermore, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the seal portion needs to be fixed, and the number of fixing points can be reduced. Simple structure. Further, the middle portion of the seal portion is regulated by the deformation regulating portion, and at least one of the seal portion and the wraparound portion of the seal portion is regulated by the corresponding guide. Can be suppressed from being abnormally deformed, thereby making it possible to omit the reinforcing film integrally provided inside the seal portion. In particular, if a configuration is provided that includes both the valve frame body side guide and the valve head side guide in addition to the deformation restricting section, abnormal deformation at each part of the seal section is completely prevented even if the reinforcing membrane is omitted. can do.
[0070]
In the valve device according to the ninth aspect of the present invention, a valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end thereof; , A shaft member slidably provided in a direction of coming and going with respect to the first connection port, a valve body attached to a distal end of the shaft member, and slidably supporting a middle of the shaft member. And a slide mechanism that slides the shaft member. The valve body contacts the peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port. A valve head having a valve head to be closed, and an end fixed to define a portion extending from the valve head toward the bearing and slidingly contacting the bearing and the shaft member from an internal fluid passage; Having a cylindrical seal portion that is deformed with the sliding of at least the seal portion and the valve head. The layer portion is integrally formed of a synthetic resin, and the seal portion is a wraparound portion wrapping around the back side of the valve head, an intermediate portion smaller in diameter than the valve head, and continuous from the intermediate portion. A valve frame body-side seal portion that expands and separates from the valve head while the diameter of the wraparound portion increases while separating from the bearing while the diameter of the valve frame-side seal portion increases, The valve element is movable from the open state to the closed state, and the degree of increase in the diameter of the wraparound part and the valve frame side seal part accompanying the sliding of the shaft member is greater than the degree of increase in the diameter in the middle part. Therefore, the following effects can be obtained. That is, since the portion from the surface layer portion of the valve head to the cylindrical seal portion extending to the bearing side and having the fixed end portion is integrally formed, it is possible to eliminate the gap forming portion in the valve head. In addition, since the cylindrical seal section divides a portion where the bearing and the shaft member come into sliding contact with each other from the internal fluid passage, a portion where the bearing and the portion supported by the bearing come into sliding contact with each other is shielded. Further, the valve body has an integral structure with no gaps on the entire outside and is formed in a bag shape, so that only the opening end of the cylindrical seal portion needs to be fixed, and the number of fixing points is reduced. Is possible. Further, as the valve element moves from the open state to the valve closed state, the wraparound part of the seal part separates from the valve head, and the valve frame body side seal part separates from the bearing. Since the inclination of the both ends on the end side changes as the shaft member slides and functions as a deformed portion of the seal portion, the deformed portion of the seal portion can be dispersed at both ends. The diameter of the part can be reduced to a small diameter, and the size of the seal part can be reduced. Further, by dispersing the deformed portion of the seal portion at both ends, it is possible to design a large slide amount of the shaft member.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a sanitary joint to which a valve device of the present invention is applied, showing a valve closed state.
FIG. 2 is a longitudinal sectional view showing a state where the joint of FIG. 1 is in a valve open state.
3 is a longitudinal sectional view showing a valve closed state (left side in the figure) and an open state (right side in the figure) of the joint of FIG. 1;
4 (a) is a longitudinal sectional view showing a valve head side guide provided in the joint of FIG. 1, and FIG. 4 (b) is a longitudinal sectional view showing the valve frame body side guide.
FIG. 5 is a cross-sectional view showing a valve closed state (left side in the figure) and an open state (right side in the figure) of another sanitary joint to which the valve device of the present invention is applied.
FIG. 6 is a cross-sectional view showing a closed state (left side in the figure) and an open state (right side in the figure) of still another sanitary joint to which the valve device of the present invention is applied.
FIG. 7 is a sectional view showing a valve closed state (left side in the figure) and an open state (right side in the figure) of still another sanitary joint to which the valve device of the present invention is applied.
FIG. 8 is a cross-sectional view showing a valve closed state (left side in the figure) and an open state (right side in the figure) of still another sanitary joint to which the valve device of the present invention is applied.
FIG. 9 is a sectional view showing a valve closed state (left side in the figure) and an open state (right side in the figure) of still another sanitary joint to which the valve device of the present invention is applied.
FIG. 10 is a cross-sectional view showing a valve closed state (left side in the figure) and an open state (right side in the figure) of still another sanitary joint to which the valve device of the present invention is applied.
FIG. 11 is a cross-sectional view showing a closed state (left side in the figure) and an open state (right side in the figure) of still another sanitary joint to which the valve device of the present invention is applied.
FIG. 12 is a longitudinal sectional view showing a conventional sanitary joint, in which (a) shows a state where both joints are separated from each other, and (b) shows a state where both joints are connected.
FIG. 13 is an explanatory view of a problem of a conventional sanitary joint.
[Explanation of symbols]
1 Fitting
2 Valve frame
3 Internal fluid passage
3a First connection port
3b Second connection port
4 slide mechanism
5 Shaft member
6 Bearing
10 valve body
11 Valve head
12 Seal part
12A middle part
12B Sealing part on valve frame side
12C wraparound part
13 Valve head side guide
14. Valve frame side guide
15 Moving parts
15a Stepped part (follow-up mechanism)
20 Deformation regulation department
22, 23, 24 Step section (follow-up mechanism)

Claims (11)

内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、
上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って内側に湾曲変形する筒状シール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、
上記軸部材には、少なくとも開弁状態で内部流体を通流しているときに、内側に湾曲変形する該シール部における両端間の途中部分と接触し、該途中部分の内側への湾曲変形を規制する外周面を有する変形規制部が設けられていることを特徴とする弁装置。A valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end, and a direction in which the inside of the valve frame comes into contact with and separates from the first connection port. A shaft member slidably provided, a valve body attached to a distal end portion of the shaft member, a bearing slidably supporting a middle of the shaft member, and a slide mechanism for sliding the shaft member,
The valve body has a valve head that contacts a peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port, and a bearing from the valve head. A cylindrical seal portion extending to the side and fixed at its end so as to partition a portion in sliding contact between the bearing and the shaft member from the internal fluid passage, and curving inward as the shaft member slides. Has, the seal portion and at least the surface layer portion of the valve head are integrally formed of synthetic resin,
At least when the internal fluid is flowing in the valve-open state, the shaft member comes into contact with a halfway portion between both ends of the seal portion that bends inward, thereby restricting the halfway portion from bending inward. A valve device provided with a deformation restricting portion having an outer peripheral surface. 請求項１に記載の弁装置において、
前記変形規制部は、閉弁状態から前記途中部分と接触して内側への湾曲変形を規制することを特徴とする弁装置。The valve device according to claim 1,
The valve device, wherein the deformation restricting portion restricts inward bending deformation by coming into contact with the intermediate portion from a valve-closed state. 内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、
上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、少なくとも開弁状態で内部流体を通流しているときに、該弁枠体側シール部分と接触するリング状の弁枠体側ガイドが設けられ、該弁枠体側ガイドが弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持されることを特徴とする弁装置。A valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end, and a direction in which the inside of the valve frame comes into contact with and separates from the first connection port. A shaft member slidably provided, a valve body attached to a distal end portion of the shaft member, a bearing slidably supporting a middle of the shaft member, and a slide mechanism for sliding the shaft member,
The valve body has a valve head that contacts a peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port, and a bearing from the valve head. A seal portion extending to the side and having an end portion fixed so as to define a portion where the bearing and the shaft member come into sliding contact with each other from an internal fluid passage and deforming as the shaft member slides; The valve part is formed integrally with a synthetic resin at least at a surface layer part of the valve head, and a boundary portion between the valve frame body and the shaft member, and a valve from an end portion to a middle portion of the seal portion fixed to the valve frame body. A ring-shaped valve frame-side guide that comes into contact with the valve frame-side seal portion when the internal fluid is flowing at least in a valve-open state is provided between the valve frame-side guide and the valve frame-side guide. The valve frame and the moving member that moves in the sliding direction by sliding the shaft member. Valve apparatus characterized by being deformably supported deflection. 請求項３に記載の弁装置において、
軸部材が閉弁状態から開弁状態にスライドする途中から移動部材を弁枠体が支持し、かつ軸部材が開弁状態から閉弁状態にスライドする途中から移動部材を軸部材が支持し、弁枠体に支持されてから軸部材に支持されるまでの間では移動部材を非移動状態とする移動部材の追従機構が設けられていることを特徴とする弁装置。The valve device according to claim 3,
The valve frame supports the moving member while the shaft member slides from the valve closed state to the valve open state, and the shaft member supports the moving member while the shaft member slides from the valve open state to the valve closed state, A valve device comprising a moving member follow-up mechanism that keeps the moving member in a non-moving state between the time when the moving member is supported by the shaft member and the time when the moving member is supported by the valve frame. 内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、
上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成され、シール部の弁頭部背面側に回り込んでいる回り込み部分と弁頭部の背面側との間に、少なくとも開弁状態で内部流体を通流しているときに回り込み部分と接触するリング状の弁頭部側ガイドが設けられていることを特徴とする弁装置。A valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end, and a direction in which the inside of the valve frame comes into contact with and separates from the first connection port. A shaft member slidably provided, a valve body attached to a distal end portion of the shaft member, a bearing slidably supporting a middle of the shaft member, and a slide mechanism for sliding the shaft member,
The valve body has a valve head that contacts a peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port, and a bearing from the valve head. A seal portion extending to the side and having an end portion fixed so as to define a portion where the bearing and the shaft member come into sliding contact with each other from an internal fluid passage and deforming as the shaft member slides; At least a surface portion of the valve head is integrally formed of a synthetic resin, and at least a valve is opened between a wraparound portion of the seal portion wrapping around the back side of the valve head and the back side of the valve head. A valve device provided with a ring-shaped valve head side guide that comes into contact with a wraparound portion when an internal fluid flows in a state. 内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、
上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形するシール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、
上記軸部材に設けられ、少なくとも開弁状態で内部流体を通流しているときに、該シール部における両端間の途中部分と接触し、該途中部分の内側への変形を規制する外周面を備える変形規制部を有するとともに、弁枠体と軸部材との境界部分と、シール部における弁枠体に固定された端部から途中部分までの弁枠体側シール部分との間に、弁枠体と軸部材のスライドによりそのスライド方向に移動する移動部材とにより撓み変形可能に支持された状態で設けられ、少なくとも開弁状態で内部流体を通流しているときに該弁枠体側シール部分と接触するリング状の弁枠体側ガイド、および、シール部の弁頭部背面側に回り込んでいる回り込み部分と弁頭部の背面側との間に設けられ、少なくとも開弁状態で内部流体を通流しているときに回り込み部分と接触するリング状の弁頭部側ガイドのうちの少なくとも一方を有することを特徴とする弁装置。A valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end, and a direction in which the inside of the valve frame comes into contact with and separates from the first connection port. A shaft member slidably provided, a valve body attached to a distal end portion of the shaft member, a bearing slidably supporting a middle of the shaft member, and a slide mechanism for sliding the shaft member,
The valve body has a valve head that contacts a peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port, and a bearing from the valve head. A seal portion extending to the side and having an end portion fixed so as to define a portion where the bearing and the shaft member come into sliding contact with each other from an internal fluid passage and deforming as the shaft member slides; The part and at least the surface part of the valve head are integrally formed of synthetic resin,
An outer peripheral surface is provided on the shaft member and contacts an intermediate portion between both ends of the seal portion at least when the internal fluid is flowing in a valve-open state, and regulates an inward deformation of the intermediate portion. While having a deformation restricting portion, between the boundary portion between the valve frame and the shaft member, between the end portion fixed to the valve frame in the seal portion and the valve frame side sealing portion from the middle part, the valve frame body It is provided in a state supported by a movable member that moves in the sliding direction by sliding of the shaft member so as to be flexibly deformable, and comes into contact with the valve frame body side seal portion at least when the internal fluid flows in the valve open state. A ring-shaped valve frame body-side guide, and provided between the wraparound portion of the seal portion wrapping around the back side of the valve head and the back side of the valve head, allowing the internal fluid to flow at least in the open state. When you are around Valve device, characterized in that it comprises at least one of the ring-shaped valve head side guide in contact with the saw portions. 請求項６に記載の弁装置において、
弁枠体側ガイドおよび弁頭部側ガイドを有し、閉弁状態のとき、弁枠体側シール部分および回り込み部分の少なくとも一方が該当するガイドから離れ、開弁状態のとき、弁枠体側シール部分が弁枠体側ガイドを押圧して撓み変形させることを特徴とする弁装置。The valve device according to claim 6,
It has a valve frame body side guide and a valve head side guide, and at the time of the valve closed state, at least one of the valve frame body side seal portion and the wraparound portion separates from the corresponding guide, and when the valve is open, the valve frame body side seal portion A valve device, wherein a valve frame side guide is pressed to bend and deform. 請求項１に記載の弁装置において、
前記シール部は、軸部材のスライド方向に沿って複数の鼓状部を有するものであることを特徴とする弁装置。The valve device according to claim 1,
The said seal part has a several drum-shaped part along the sliding direction of a shaft member, The valve apparatus characterized by the above-mentioned. 内部流体通路の一端に第１接続口が、その他端に第２接続口がそれぞれ設けられた弁枠体と、該弁枠体の内部に、該第１接続口に対して接離する方向へスライド可能に設けられた軸部材と、該軸部材の先端部に取付けられる弁体と、該軸部材の途中をスライド自在に支持する軸受と、該軸部材をスライドさせるスライド機構とを備え、
上記弁体は、軸部材の第１接続口への接近スライドにより該第１接続口の周縁部に当接して第１接続口を閉弁状態にする弁頭部と、該弁頭部から軸受側に延出されて該軸受と該軸部材との摺接する部分を内部流体通路から区画するように端部が固定されかつ軸部材のスライドに伴って変形する筒状シール部とを有し、該シール部と該弁頭部の少なくとも表層部とが合成樹脂で一体に形成されており、前記シール部は、前記弁頭部の背面側に回り込んでいる回り込み部分と、弁頭部より小径の途中部分と、該途中部分から連続して拡径する弁枠体側シール部分とを有し、
前記回り込み部分の径が拡大しながら前記弁頭部から離れるとともに、前記弁枠体側シール部分の径が拡大しながら前記軸受から離れて、弁体が開弁状態から閉弁状態に移動可能となっているとともに、軸部材のスライドに伴う回り込み部分および前記弁枠体側シール部分の径の拡大程度が、途中部分での径の拡大程度よりも大きいことを特徴とする弁装置。A valve frame having a first connection port at one end of the internal fluid passage and a second connection port at the other end, and a direction in which the inside of the valve frame comes into contact with and separates from the first connection port. A shaft member slidably provided, a valve body attached to a distal end portion of the shaft member, a bearing slidably supporting a middle of the shaft member, and a slide mechanism for sliding the shaft member,
The valve body has a valve head that contacts a peripheral portion of the first connection port by sliding the shaft member toward the first connection port to close the first connection port, and a bearing from the valve head. A cylindrical seal portion extending to the side and having an end portion fixed so as to partition a portion in sliding contact between the bearing and the shaft member from the internal fluid passage and deforming as the shaft member slides, The seal portion and at least a surface portion of the valve head are integrally formed of synthetic resin, and the seal portion has a wraparound portion wrapping around the back side of the valve head, and a smaller diameter than the valve head. And a valve frame-side sealing portion that continuously increases in diameter from the middle portion,
As the diameter of the wraparound portion increases and moves away from the valve head, and the diameter of the valve frame body-side seal portion increases while moving away from the bearing, the valve body can move from the open state to the closed state. The valve device is characterized in that the degree of increase in the diameter of the wraparound part and the valve frame body side seal part accompanying the sliding of the shaft member is greater than the degree of increase in the diameter in the middle part. 請求項９に記載の弁装置において、
回り込み部分と途中部分との境界部分、および弁枠体側シール部分と途中部分との境界部分が、軸部材のスライドに伴って変形する変形部として機能するようになっていることを特徴とする弁装置。The valve device according to claim 9,
A valve, wherein a boundary portion between the wraparound portion and the middle portion and a boundary portion between the valve frame body side sealing portion and the middle portion function as a deformable portion that deforms as the shaft member slides. apparatus. 請求項３、４、７、８、９または１０に記載の弁装置において、
シール部における弁枠体に固定された端部に最も近い位置に形成される内側湾曲部から該端部までが、連続して軸受側寄りに位置するとともに、該端部が第２接続口の軸受側部分よりも第１接続口側に位置するように、前記弁枠体側ガイドがシール部を規制することを特徴とする弁装置。The valve device according to claim 3, 4, 7, 8, 9, or 10,
From the inner curved portion formed at the position closest to the end fixed to the valve frame in the seal portion to the end, the end is continuously located closer to the bearing side, and the end is the second connection port. A valve device wherein the valve frame body side guide regulates a seal portion so as to be located closer to a first connection port than a bearing side portion.
JP2002224065A 2002-07-31 2002-07-31 Valve device Expired - Lifetime JP3902090B2 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5435413A (en) * 1977-08-16 1979-03-15 Payne Barrett Morley M Fluid valve
JPS5514127U (en) * 1978-07-12 1980-01-29
JPS61160667A (en) * 1984-11-13 1986-07-21 アメリカン・スタンダ−ド・インコ−ポレイテツド Clamping mechanism of diaphragm plate
JPH0185589U (en) * 1987-11-30 1989-06-07
US5152500A (en) * 1991-03-27 1992-10-06 Asepco, Inc. Aseptic valve construction
JPH0614509U (en) * 1992-07-31 1994-02-25 エヌオーケー株式会社 Diaphragm device
JP2004003579A (en) * 2002-04-26 2004-01-08 Nabco Ltd Valve arrangement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5435413A (en) * 1977-08-16 1979-03-15 Payne Barrett Morley M Fluid valve
JPS5514127U (en) * 1978-07-12 1980-01-29
JPS61160667A (en) * 1984-11-13 1986-07-21 アメリカン・スタンダ−ド・インコ−ポレイテツド Clamping mechanism of diaphragm plate
JPH0185589U (en) * 1987-11-30 1989-06-07
US5152500A (en) * 1991-03-27 1992-10-06 Asepco, Inc. Aseptic valve construction
JPH0614509U (en) * 1992-07-31 1994-02-25 エヌオーケー株式会社 Diaphragm device
JP2004003579A (en) * 2002-04-26 2004-01-08 Nabco Ltd Valve arrangement

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