JP4082941B2

JP4082941B2 - Three-way valve

Info

Publication number: JP4082941B2
Application number: JP2002188813A
Authority: JP
Inventors: 克彦別所; 伸一北崎; 啓一柳瀬
Original assignee: Kubota Corp; Osaka Gas Co Ltd
Current assignee: Kubota Corp; Osaka Gas Co Ltd
Priority date: 2002-06-28
Filing date: 2002-06-28
Publication date: 2008-04-30
Anticipated expiration: 2022-06-28
Also published as: JP2004028283A

Description

【０００１】
【発明の属する技術分野】
本発明は、第１〜第３の出入口を有し、第１〜第３の全ての出入口を開く第１全開切換位置と第２の出入口のみを閉じる第２片閉切換位置と第３の出入口のみを閉じる第３片閉切換位置とに切換自在な三方弁に関する。
【０００２】
【従来の技術】
従来、この種の三方弁としては、例えば図１１〜図１６に示すものがある。すなわち、三方弁１の弁箱２には第１〜第３の出入口３〜５が形成されている。弁箱２の内部には、上記第１〜第３の全ての出入口３〜５が開く第１全開切換位置Ａ（図１１参照）と第２の出入口４のみが閉じる第２片閉切換位置Ｂ（図１２参照）と第３の出入口５のみが閉じる第３片閉切換位置Ｃ（図１３参照）とに回転自在な弁体６を備えている。上記弁体６には回転自在な弁棒７が設けられ、この弁棒７の先端部には減速機（図示省略）を介して操作用ハンドル（図示省略）等が取付けられている。作業者が操作用ハンドルを回すことによって、弁棒７が回転し、弁体６が回転軸心１６周りに回転して上記各切換位置Ａ〜Ｃに切換えられる。
【０００３】
図１１に示すように、上記弁体６には、第１全開切換位置Ａにおいて、第１の出入口３に対して開口する円筒状の第１の開口部８と、第２の出入口４に対して開口する円筒状の第２の開口部９と、第３の出入口５に対して開口する円筒状の第３の開口部１０とが形成されている。弁体６内には、上記第１〜第３の開口部８〜１０に連通するＴ形状の弁体流路１１が形成されている。
【０００４】
また、弁箱２内の第２の出入口４側には、第２の出入口４の流路軸心４ａを中心とするリング状の一方の弁箱シート１２ａが設けられるとともに、弁箱２内の第３の出入口５側には、第３の出入口５の流路軸心５ａを中心とするリング状の他方の弁箱シート１２ｂが設けられている。
【０００５】
また、弁体６には、第２片閉切換位置Ｂ（図１２参照）に切換えた場合に上記一方の弁箱シート１２ａに圧接され且つ第３片閉切換位置Ｃ（図１３参照）に切換えた場合に上記他方の弁箱シート１２ｂに圧接される弁体シート１４がボルト，ナット１５を介して取付けられている。図１４に示すように、上記弁体シート１４は、周縁部に傾斜部１４ａを有する円形の皿形状に形成されており、上記第１の開口部８の反対側に位置している。
【０００６】
尚、第１〜第３の出入口３〜５にはそれぞれ配管（図示せず）が接続されている。
これによると、作業者が操作用ハンドルを回すことによって、図１１に示すように、弁体６を第１全開切換位置Ａに切換えた場合、第１の開口部８が第１の出入口３に対して開口するとともに、第２の開口部９が第２の出入口４に対して開口し、第３の開口部１０が第３の出入口５に対して開口するため、第１〜第３の全ての出入口３〜５が開く。これにより、第２および第３の出入口４，５から流入した流体（都市ガス等）が弁体流路１１を通って第１の出入口３から排出される。
【０００７】
また、図１２に示すように、弁体６を第２片閉切換位置Ｂに切換えた場合、第１の開口部８が第３の出入口５に対して開口するとともに、第２の開口部９が第１の出入口３に対して開口するため、第１の出入口３と第３の出入口５とが開く。この際、弁体シート１４の傾斜部１４ａが一方の弁箱シート１２ａのシール面１３に圧接するため、第２の出入口４は閉鎖されて水密にシールされる。これにより、第３の出入口５から流入した流体が弁体流路１１を通って第１の出入口３から排出される。
【０００８】
同様に、図１３に示すように、弁体６を第３片閉切換位置Ｃに切換えた場合、第１の出入口３と第２の出入口４とが開く。この際、弁体シート１４の傾斜部１４ａが他方の弁箱シート１２ｂのシール面１３に圧接するため、第３の出入口５は閉鎖されて水密にシールされる。これにより、第２の出入口４から流入した流体が弁体流路１１を通って第１の出入口３から排出される。
【０００９】
【発明が解決しようとする課題】
しかしながら上記の従来形式では、図１１，図１４に示すように、弁体６を第１全開切換位置Ａに切換えた場合、配管内や流体中に存在する異物（溶接スラグ等）が、弁体６の第１の開口部８から両弁箱シート１２ａ，１２ｂのシール面１３に連通する空間Ｓ１へ入り込み、弁箱シート１２ａ，１２ｂのシール面１３を傷付ける恐れがあった。
【００１０】
また、図１２，図１５に示すように、弁体６を第２片閉切換位置Ｂに切換えた場合、上記異物が弁体６の第２および第３の開口部９，１０から他方の弁箱シート１２ｂのシール面１３に連通する空間Ｓ２へ入り込み、他方の弁箱シート１２ｂのシール面１３を傷付ける恐れがあった。さらに、図１６に示すように、上記異物が弁体６の第２および第３の開口部９，１０から一方の弁箱シート１２ａのシール面１３に連通する空間Ｓ３へ入り込み、一方の弁箱シート１２ａのシール面１３を傷付ける恐れがあった。
【００１１】
また、図１３に示すように、弁体６を第３片閉切換位置Ｃに切換えた場合、同様に、上記異物が弁体６の第２および第３の開口部９，１０から一方の弁箱シート１２ａのシール面１３に連通する空間Ｓ３へ入り込み、一方の弁箱シート１２ａのシール面１３を傷付ける恐れがあった。さらに、上記異物が弁体６の第２および第３の開口部９，１０から他方の弁箱シート１２ｂのシール面１３に連通する空間Ｓ２へ入り込み、他方の弁箱シート１２ｂのシール面１３を傷付ける恐れがあった。
【００１２】
本発明は、弁体を各切換位置に切換えた場合、異物が弁体の第１〜第３の各開口部から弁箱シートに連通する空間内へ入り込んで弁箱シートを傷付けるといった不具合を防止できる三方弁を提供することを目的とする。
【００１３】
【課題を解決するための手段】
上記目的を達成するために本発明は、弁箱に第１〜第３の出入口を有し、弁箱内に、上記第１〜第３の全ての出入口が開く第１全開切換位置と第２の出入口のみが閉じる第２片閉切換位置と第３の出入口のみが閉じる第３片閉切換位置とに回転自在な弁体を備えた三方弁であって、上記第１全開切換位置において、第１の出入口に対して開口する第１の開口部と第２の出入口に対して開口する第２の開口部と第３の出入口に対して開口する第３の開口部とが弁体に形成され、上記弁箱内の第２の出入口側に、第２の出入口の流路軸心を中心とするリング状の一方の弁箱シートが設けられるとともに、第３の出入口側に、第３の出入口の流路軸心を中心とするリング状の他方の弁箱シートが設けられ、上記弁体に、一対の円盤部材と、第２片閉切換位置に切換えた場合に上記一方の弁箱シートに圧接され且つ第３片閉切換位置に切換えた場合に上記他方の弁箱シートに圧接される弁体シートとが設けられ、上記両円盤部材は第１の開口部の流路軸心を中心として形成され、一方の円盤部材が第１の開口部側に配置されるとともに他方の円盤部材が第１の開口部の反対側に配置されて、上記両円盤部材間に上記第２の開口部と第３の開口部とが位置し、上記弁箱内面にリング状の第１〜第３の突起部が形成され、上記第１の突起部は、第１の出入口の流路軸心を中心とし、且つ、弁体を第１全開切換位置に切換えた場合、弁体の第１の開口部の先端と弁箱内面との間に突出して、第１の開口部から両弁箱シートに連通する空間を狭窄し、上記第２および第３の突起部は、第２および第３の出入口の流路軸心を中心とし、且つ、上記両弁箱シート間に位置し、上記弁体を第２片閉切換位置に切換えた場合、一方の円盤部材が第３の突起部の内周側へ嵌り込んで、第２および第３の開口部から他方の弁箱シートに連通する空間を狭窄するとともに、他方の円盤部材が第２の突起部の内周側へ嵌り込んで、第２および第３の開口部から一方の弁箱シートに連通する空間を狭窄し、上記弁体を第３片閉切換位置に切換えた場合、一方の円盤部材が第２の突起部の内周側へ嵌り込んで、第２および第３の開口部から一方の弁箱シートに連通する空間を狭窄するとともに、他方の円盤部材が第３の突起部の内周側へ嵌り込んで、第２および第３の開口部から他方の弁箱シートに連通する空間を狭窄するものである。
【００１４】
これによると、弁体を第１全開切換位置に切換えた場合、第１の突起部が弁体の第１の開口部の先端と弁箱内面との間に突出しているため、弁体の第１の開口部の先端と弁箱内面との間に形成される隙間が上記第１の突起部によって全周にわたり減少する。これにより、第１の開口部から弁体の外側を通って両弁箱シートに連通する空間の一部が上記第１の突起部によって狭窄されるため、異物が第１の開口部から上記空間に入り込むことをほとんど阻止でき、したがって弁箱シートが異物によって傷付けられるのを防止することができる。
【００１５】
また、弁体を第２片閉切換位置に切換えた場合、一方の円盤部材が第３の突起部の内周側へ嵌り込むため、第２および第３の開口部から弁体の外側を通って他方の弁箱シートに連通する空間の一部が一方の円盤部材と第３の突起部とによって狭窄される。これにより、異物が第２および第３の開口部から上記空間に入り込むことをほとんど阻止でき、したがって、他方の弁箱シートが異物によって傷付けられるのを防止することができる。さらに、他方の円盤部材が第２の突起部の内周側へ嵌り込むため、第２および第３の開口部から弁体の外側を通って一方の弁箱シートに連通する空間の一部が他方の円盤部材と第２の突起部とによって狭窄される。これにより、異物が第２および第３の開口部から上記空間に入り込むことをほとんど阻止でき、したがって、一方の弁箱シートが異物によって傷付けられるのを防止することができる。
【００１６】
また、弁体を第３片閉切換位置に切換えた場合、一方の円盤部材が第２の突起部の内周側へ嵌り込むため、第２および第３の開口部から弁体の外側を通って一方の弁箱シートに連通する空間の一部が一方の円盤部材と第２の突起部とによって狭窄される。これにより、異物が第２および第３の開口部から上記空間に入り込むことをほとんど阻止でき、したがって、一方の弁箱シートが異物によって傷付けられるのを防止することができる。さらに、他方の円盤部材が第３の突起部の内周側へ嵌り込むため、第２および第３の開口部から弁体の外側を通って他方の弁箱シートに連通する空間の一部が他方の円盤部材と第３の突起部とによって狭窄される。これにより、異物が第２および第３の開口部から上記空間に入り込むことをほとんど阻止でき、したがって、他方の弁箱シートが異物によって傷付けられるのを防止することができる。
【００１７】
【発明の実施の形態】
以下、本発明における実施の形態を図１〜図１０に基づいて説明する。尚、先に述べた従来のものと同一の部材については同じ符号を付記して説明を省略する。
【００１８】
図７〜図１０に示すように、弁体６には互いに平行な一対の円盤部材３０ａ，３０ｂが設けられている。両円盤部材３０ａ，３０ｂは、第１の開口部８の流路軸心８ａから第２および第３の開口部９，１０までの距離をＲとすると、上記流路軸心８ａを中心として半径Ｒの円に形成されている。このうち、図７に示すように、一方の円盤部材３０ａは弁体６の回転軸心１６に対して第１の開口部８側に配置され、他方の円盤部材３０ｂは上記回転軸心１６に対して第１の開口部８の反対側に配置され、両円盤部材３０ａ，３０ｂ間に第２の開口部９と第３の開口部１０とが位置している。また、両円盤部材３０ａ，３０ｂ間の間隔は第２および第３の開口部９，１０の直径に等しく形成されている。
【００１９】
図１〜図６に示すように、弁箱２の内面には、リング状の第１〜第３の突起部３１〜３３が溶接（又は一体成形）されて設けられている。このうち、図２，図５に示すように、上記第１の突起部３１は、第１の出入口３の流路軸心３ａ（中心線）を中心として同軸上に配置されて第１の出入口３の奥に位置し、図１，図４に示すように、弁体６を第１全開切換位置Ａに切換えた場合、弁体６の第１の開口部８の先端８ｂと弁箱２の内面との間に全周にわたり突出している。
【００２０】
また、上記第２および第３の突起部３２，３３は、第２および第３の出入口４，５の流路軸心４ａ，５ａを中心として同軸上に配置されており、且つ、両弁箱シート１２ａ，１２ｂ間に位置している。
【００２１】
図２に示すように、弁体６を第２片閉切換位置Ｂに切換えた場合、図５に示すように、一方の円盤部材３０ａが第３の突起部３３の内周側へ嵌り込むとともに、図６に示すように、他方の円盤部材３０ｂが第２の突起部３２の内周側へ嵌り込むように構成されている。
【００２２】
また、図３に示すように、弁体６を第３片閉切換位置Ｃに切換えた場合、同様に、一方の円盤部材３０ａが第２の突起部３２の内周側へ嵌り込むとともに、他方の円盤部材３０ｂが第３の突起部３３の内周側へ嵌り込むように構成されている。
【００２３】
以下、上記構成による作用を説明する。
（１）作業者が操作用ハンドルを回して、図１に示すように、弁体６を第１全開切換位置Ａに切換えた場合、図４に示すように、第１の突起部３１が弁体６の第１の開口部８の先端８ｂと弁箱２の内面との間に突出しているため、上記第１の開口部８の先端８ｂと弁箱２の内面との間に形成される隙間が第１の突起部３１によって全周にわたり従来よりも減少する。これにより、上記第１の開口部８から弁体６の外側を通って両弁箱シート１２ａ，１２ｂに連通する空間Ｓ１の一部が第１の突起部３１によって狭窄されるため、異物が第１の開口部８から上記空間Ｓ１に入り込むことをほとんど阻止でき、したがって、両弁箱シート１２ａ，１２ｂのシール面１３が異物によって傷付けられるのを防止することができる。尚、この場合、第１の開口部８の先端８ｂと第１の突起部３１との間には、それぞれ、約２ｍｍ〜４ｍｍ程度の微小な隙間が形成される。
【００２４】
（２）また、図２に示すように、弁体６を第２片閉切換位置Ｂに切換えた場合、図５に示すように、一方の円盤部材３０ａが第３の突起部３３の内周側へ嵌り込むため、第２および第３の開口部９，１０から弁体６の外側を通って他方の弁箱シート１２ｂに連通する空間Ｓ２の一部が一方の円盤部材３０ａと第３の突起部３３とによって狭窄される。これにより、異物が第２および第３の開口部９，１０から上記空間Ｓ２に入り込むことをほとんど阻止でき、したがって、他方の弁箱シート１２ｂのシール面１３が異物によって傷付けられるのを防止することができる。
【００２５】
さらに、図６に示すように、他方の円盤部材３０ｂが第２の突起部３２の内周側へ嵌り込むため、第２および第３の開口部９，１０から弁体６の外側を通って一方の弁箱シート１２ａに連通する空間Ｓ３の一部が他方の円盤部材３０ｂと第２の突起部３２とによって狭窄される。これにより、異物が第２および第３の開口部９，１０から上記空間Ｓ３に入り込むことをほとんど阻止でき、したがって、一方の弁箱シート１２ａのシール面１３が異物によって傷付けられるのを防止することができる。尚、この場合、一方の円盤部材３０ａの外周縁と第３の突起部３３の内周縁との間、並びに、他方の円盤部材３０ｂの外周縁と第２の突起部３２の内周縁との間には、それぞれ、約２ｍｍ〜４ｍｍ程度の微小な隙間が形成される。
【００２６】
（３）また、図３に示すように、弁体６を第３片閉切換位置Ｃに切換えた場合、一方の円盤部材３０ａが第２の突起部３２の内周側へ嵌り込むため、第２および第３の開口部９，１０から弁体６の外側を通って一方の弁箱シート１２ａに連通する空間Ｓ３の一部が一方の円盤部材３０ａと第２の突起部３２とによって狭窄される。これにより、異物が第２および第３の開口部９，１０から上記空間Ｓ３に入り込むことをほとんど阻止でき、したがって、一方の弁箱シート１２ａのシール面１３が異物によって傷付けられるのを防止することができる。
【００２７】
さらに、他方の円盤部材３０ｂが第３の突起部３３の内周側へ嵌り込むため、第２および第３の開口部９，１０から弁体６の外側を通って他方の弁箱シート１２ｂに連通する空間Ｓ２の一部が他方の円盤部材３０ｂと第３の突起部３３とによって狭窄される。これにより、異物が第２および第３の開口部９，１０から上記空間Ｓ２に入り込むことをほとんど阻止でき、したがって、他方の弁箱シート１２ｂのシール面１３が異物によって傷付けられるのを防止することができる。尚、この場合、一方の円盤部材３０ａの外周縁と第２の突起部３２の内周縁との間、並びに、他方の円盤部材３０ｂの外周縁と第３の突起部３３の内周縁との間には、それぞれ、約２ｍｍ〜４ｍｍ程度の微小な隙間が形成される。
【００２８】
上記（１）〜（３）に示すように各弁箱シート１２ａ，１２ｂのシール面１３が異物によって傷付けられることを防止し得るため、シール性能が向上する。
上記実施の形態では、第１〜第３の突起部３１〜３３を弁箱２の内面に溶接しているが、溶接に限定されるものではなく、弁箱２の内面に肉盛りして第１〜第３の突起部３１〜３３を形成してもよい。
【００２９】
【発明の効果】
以上のように本発明によると、弁体を各切換位置に切換えた場合、弁体に設けられた一対の円盤部材と弁箱内面に設けられた第１〜第３の各突起部とによって、弁体の第１〜第３の各開口部から弁体の外側を通って両弁箱シートに連通する各空間が狭窄される。これにより、異物が上記第１〜第３の各開口部から上記各空間に入り込むことをほとんど阻止でき、したがって、両弁箱シートが上記異物によって傷付けられるのを防止することができ、シール性能が向上する。
【図面の簡単な説明】
【図１】本発明の実施の形態における三方弁の断面図であって、弁体を第１全開切換位置に切換えた状態を示す。
【図２】同、三方弁の断面図であって、弁体を第２片閉切換位置に切換えた状態を示す。
【図３】同、三方弁の断面図であって、弁体を第３片閉切換位置に切換えた状態を示す。
【図４】図１における一部拡大図であって、（ａ）は図１のＸ部の拡大図、（ｂ）は図１のＹ部の拡大図を示す。
【図５】図２における一部拡大図であって、（ａ）は図２のＷ部の拡大図、（ｂ）は図２のＸ部の拡大図を示す。
【図６】図２における一部拡大図であって、（ａ）は図２のＹ部の拡大図、（ｂ）は図２のＺ部の拡大図を示す。
【図７】同、三方弁の弁体の図であって、弁棒の軸心方向から見た一部断面図である。
【図８】図７におけるＸ−Ｘ矢視図である。
【図９】図７におけるＹ−Ｙ矢視図である。
【図１０】図７におけるＺ−Ｚ矢視図である。
【図１１】従来の三方弁の断面図であって、弁体を第１全開切換位置に切換えた状態を示す。
【図１２】同、三方弁の断面図であって、弁体を第２片閉切換位置に切換えた状態を示す。
【図１３】同、三方弁の断面図であって、弁体を第３片閉切換位置に切換えた状態を示す。
【図１４】図１１における一部拡大図であって、（ａ）は図１１のＸ部の拡大図、（ｂ）は図１１のＹ部の拡大図を示す。
【図１５】図１２における一部拡大図であって、（ａ）は図１２のＷ部の拡大図、（ｂ）は図１２のＸ部の拡大図を示す。
【図１６】図１２における一部拡大図であって、（ａ）は図１２のＹ部の拡大図、（ｂ）は図１２のＺ部の拡大図を示す。
【符号の説明】
１三方弁
２弁箱
３〜５第１〜第３の出入口
３ａ第１の出入口の流路軸心
４ａ第２の出入口の流路軸心
５ａ第３の出入口の流路軸心
６弁体
８〜１０第１〜第３の開口部
８ａ第１の開口部の流路軸心
１２ａ，１２ｂ弁箱シート
１４弁体シート
３０ａ，３０ｂ円盤部材
３１〜３３第１〜第３の突起部
Ａ第１全開切換位置
Ｂ第２片閉切換位置
Ｃ第３片閉切換位置
Ｓ１第１の開口部から両弁箱シートに連通する空間
Ｓ２第２および第３の開口部から他方の弁箱シートに連通する空間
Ｓ３第２および第３の開口部から一方の弁箱シートに連通する空間[0001]
BACKGROUND OF THE INVENTION
The present invention has a first fully open switching position that has first to third entrances and opens all of the first to third entrances, a second single closing switching position that closes only the second entrance, and a third entrance. The present invention relates to a three-way valve that can be switched to a third single-close switching position that closes only.
[0002]
[Prior art]
Conventionally, as this type of three-way valve, for example, there are those shown in FIGS. That is, the valve box 2 of the three-way valve 1 is formed with first to third entrances 3 to 5. Inside the valve box 2, a first fully open switching position A (see FIG. 11) where all the first to third entrances 3 to 5 are opened and a second single closing switching position B where only the second entrance 4 is closed. A rotatable valve body 6 is provided at (see FIG. 12) and at a third piece closing switching position C (see FIG. 13) where only the third doorway 5 is closed. The valve body 6 is provided with a rotatable valve rod 7, and an operation handle (not shown) or the like is attached to the tip of the valve rod 7 via a speed reducer (not shown). When the operator turns the operation handle, the valve rod 7 rotates, and the valve body 6 rotates around the rotation axis 16 to be switched to the switching positions A to C.
[0003]
As shown in FIG. 11, the valve body 6 has a cylindrical first opening 8 that opens to the first entrance 3 and the second entrance 4 at the first fully open switching position A. A cylindrical second opening 9 and a third cylindrical opening 10 opening with respect to the third doorway 5 are formed. In the valve body 6, a T-shaped valve body channel 11 communicating with the first to third openings 8 to 10 is formed.
[0004]
Also, on the second inlet / outlet 4 side in the valve box 2, one ring-shaped valve box sheet 12 a centering on the flow path axis 4 a of the second inlet / outlet 4 is provided, and the inside of the valve box 2 On the third inlet / outlet 5 side, the other ring-shaped valve box seat 12b centering on the flow path axis 5a of the third inlet / outlet 5 is provided.
[0005]
Further, when the valve body 6 is switched to the second piece closing switching position B (see FIG. 12), it is pressed against the one valve box seat 12a and switched to the third piece closing switching position C (see FIG. 13). In this case, a valve body sheet 14 that is pressed against the other valve box sheet 12 b is attached via bolts and nuts 15. As shown in FIG. 14, the valve body sheet 14 is formed in a circular dish shape having an inclined portion 14 a at the peripheral edge, and is located on the opposite side of the first opening 8.
[0006]
A pipe (not shown) is connected to each of the first to third entrances 3 to 5.
According to this, when the operator turns the operation handle to switch the valve body 6 to the first fully open switching position A as shown in FIG. 11, the first opening 8 is connected to the first entrance 3. Since the second opening 9 opens to the second entrance 4 and the third opening 10 opens to the third entrance 5, all of the first to third are opened. Entry / exit 3-5 opens. As a result, the fluid (city gas or the like) flowing in from the second and third inlets 4 and 5 passes through the valve body flow path 11 and is discharged from the first inlet 3.
[0007]
As shown in FIG. 12, when the valve body 6 is switched to the second piece closing switching position B, the first opening 8 opens with respect to the third entrance 5 and the second opening 9 Open to the first entrance 3, the first entrance 3 and the third entrance 5 open. At this time, since the inclined portion 14a of the valve body sheet 14 is in pressure contact with the sealing surface 13 of the one valve box sheet 12a, the second entrance 4 is closed and sealed watertight. Thereby, the fluid flowing in from the third inlet / outlet 5 passes through the valve body channel 11 and is discharged from the first inlet / outlet 3.
[0008]
Similarly, as shown in FIG. 13, when the valve body 6 is switched to the third piece closing switching position C, the first entrance 3 and the second entrance 4 are opened. At this time, since the inclined portion 14a of the valve body sheet 14 is in pressure contact with the sealing surface 13 of the other valve box sheet 12b, the third entrance / exit 5 is closed and sealed watertight. As a result, the fluid flowing in from the second inlet / outlet 4 passes through the valve body channel 11 and is discharged from the first inlet / outlet 3.
[0009]
[Problems to be solved by the invention]
However, in the above conventional type, as shown in FIGS. 11 and 14, when the valve body 6 is switched to the first fully open switching position A, foreign matter (welding slag, etc.) present in the pipe or in the fluid is 6 enters the space S1 communicating with the sealing surfaces 13 of the two valve box sheets 12a and 12b through the first opening 8 of the valve 6 and may damage the sealing surfaces 13 of the valve box sheets 12a and 12b.
[0010]
As shown in FIGS. 12 and 15, when the valve body 6 is switched to the second one-side closed switching position B, the foreign matter is transferred from the second and third openings 9 and 10 of the valve body 6 to the other valve. There was a risk of entering the space S2 communicating with the sealing surface 13 of the box sheet 12b and damaging the sealing surface 13 of the other valve box sheet 12b. Further, as shown in FIG. 16, the foreign matter enters the space S3 communicating with the seal surface 13 of one valve box sheet 12a from the second and third openings 9 and 10 of the valve body 6, and the one valve box. There was a risk of damaging the sealing surface 13 of the sheet 12a.
[0011]
Further, as shown in FIG. 13, when the valve body 6 is switched to the third one-side closed switching position C, the foreign matter is similarly transferred from the second and third openings 9 and 10 of the valve body 6 to one valve. There was a risk of entering the space S3 communicating with the sealing surface 13 of the box sheet 12a and damaging the sealing surface 13 of one valve box sheet 12a. Further, the foreign matter enters the space S2 communicating with the seal surface 13 of the other valve box sheet 12b from the second and third openings 9 and 10 of the valve body 6, and the seal surface 13 of the other valve box sheet 12b is formed. There was a risk of injury.
[0012]
In the present invention, when the valve body is switched to each switching position, it prevents a foreign matter from entering the space communicating with the valve box seat from the first to third openings of the valve body and damaging the valve box seat. The purpose is to provide a three-way valve that can be used.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a first fully open switching position and a second fully open and closed position in which the valve box has first to third inlets and the first to third outlets are opened in the valve box. A three-way valve having a rotatable valve body in a second piece closing switching position in which only the inlet / outlet is closed and a third piece closing switching position in which only the third inlet / outlet is closed, and in the first full opening switching position, The valve body is formed with a first opening that opens with respect to one doorway, a second opening that opens with respect to the second doorway, and a third opening that opens with respect to the third doorway. One of the ring-shaped valve box seats centering on the flow path axis of the second inlet / outlet is provided on the second inlet / outlet side in the valve box, and the third inlet / outlet is provided on the third inlet / outlet side. The other ring-shaped valve box seat centered on the flow axis is provided with a pair of disk members and a second piece closed. A disc body member that is pressed against the one valve box seat when switched to the replacement position and is pressed against the other valve box seat when switched to the third single-closed switching position; Is formed around the flow path axis of the first opening, and one disk member is disposed on the first opening side and the other disk member is disposed on the opposite side of the first opening. The second opening and the third opening are located between the disk members, and ring-shaped first to third protrusions are formed on the inner surface of the valve box, and the first protrusion Is centered on the flow path axis of the first inlet / outlet and protrudes between the tip of the first opening of the valve body and the inner surface of the valve box when the valve body is switched to the first fully open switching position. The space communicating from the first opening to both valve box seats is narrowed, and the second and third protrusions are the second and third When the valve body is switched to the second one-side closing switching position centered on the flow path axis of the inlet / outlet and located between the two valve box seats, one disk member becomes the inner periphery of the third protrusion. And the second disk member is fitted to the inner peripheral side of the second protrusion, and the space communicating from the second and third openings to the other valve box seat is narrowed. When the space communicating from the third opening to the one valve box seat is narrowed and the valve body is switched to the third piece closed switching position, one disk member moves toward the inner peripheral side of the second protrusion. And the second and third openings narrow the space communicating with one of the valve box seats, and the other disk member fits into the inner peripheral side of the third projecting portion. The space communicating from the opening 3 to the other valve box seat is narrowed.
[0014]
According to this, when the valve body is switched to the first fully open switching position, the first protrusion protrudes between the tip of the first opening of the valve body and the inner surface of the valve box. A gap formed between the tip of one opening and the inner surface of the valve box is reduced over the entire circumference by the first protrusion. As a result, a part of the space communicating from the first opening to the both valve box seats through the outside of the valve body is constricted by the first protrusion, so that the foreign matter is removed from the first opening to the space. Intrusion can be almost prevented, so that the valve box seat can be prevented from being damaged by foreign matter.
[0015]
Further, when the valve body is switched to the second one-side closed switching position, one of the disk members fits into the inner peripheral side of the third protrusion, so that it passes through the outside of the valve body from the second and third openings. Then, a part of the space communicating with the other valve box seat is narrowed by the one disk member and the third protrusion. As a result, foreign matter can be almost prevented from entering the space from the second and third openings, and therefore, the other valve box sheet can be prevented from being damaged by the foreign matter. Furthermore, since the other disk member fits into the inner peripheral side of the second protrusion, a part of the space communicating from the second and third openings to the one valve box seat through the outside of the valve body is formed. It is narrowed by the other disk member and the second protrusion. Thereby, it is possible to almost prevent foreign matter from entering the space from the second and third openings, and therefore it is possible to prevent one of the valve box sheets from being damaged by the foreign matter.
[0016]
Further, when the valve body is switched to the third single-close switching position, one of the disk members fits into the inner peripheral side of the second protrusion, so that it passes through the outside of the valve body from the second and third openings. A part of the space communicating with the one valve box seat is narrowed by the one disk member and the second protrusion. Thereby, it is possible to almost prevent foreign matter from entering the space from the second and third openings, and therefore it is possible to prevent one of the valve box sheets from being damaged by the foreign matter. Furthermore, since the other disk member fits into the inner peripheral side of the third protrusion, a part of the space communicating from the second and third openings to the other valve box seat through the outside of the valve body is formed. It is narrowed by the other disk member and the third protrusion. As a result, foreign matter can be almost prevented from entering the space from the second and third openings, and therefore, the other valve box sheet can be prevented from being damaged by the foreign matter.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. The same members as those described above are denoted by the same reference numerals and description thereof is omitted.
[0018]
As shown in FIGS. 7 to 10, the valve body 6 is provided with a pair of disk members 30 a and 30 b which are parallel to each other. Both disk members 30a, 30b have a radius around the flow path axis 8a, where R is the distance from the flow path axis 8a of the first opening 8 to the second and third openings 9, 10. It is formed in an R circle. Among these, as shown in FIG. 7, one disk member 30 a is disposed on the first opening 8 side with respect to the rotation axis 16 of the valve body 6, and the other disk member 30 b is disposed on the rotation axis 16. On the other hand, the second opening 9 and the third opening 10 are located between the disk members 30a and 30b. The distance between the disk members 30a and 30b is formed to be equal to the diameters of the second and third openings 9 and 10.
[0019]
As shown in FIGS. 1 to 6, ring-shaped first to third protrusions 31 to 33 are provided on the inner surface of the valve box 2 by welding (or integral molding). Among these, as shown in FIGS. 2 and 5, the first protrusion 31 is arranged coaxially with the flow path axis 3 a (center line) of the first inlet / outlet 3 as the center, and is the first inlet / outlet. 1 and FIG. 4, when the valve body 6 is switched to the first fully open switching position A, the tip 8 b of the first opening 8 of the valve body 6 and the valve box 2 It protrudes from the inner surface over the entire circumference.
[0020]
The second and third protrusions 32 and 33 are arranged coaxially around the flow path centers 4a and 5a of the second and third inlets 4 and 5, and both valve boxes. It is located between the sheets 12a and 12b.
[0021]
As shown in FIG. 2, when the valve body 6 is switched to the second one-side closing switching position B, as shown in FIG. 5, one disk member 30 a is fitted into the inner peripheral side of the third protrusion 33. As shown in FIG. 6, the other disk member 30 b is configured to fit into the inner peripheral side of the second protrusion 32.
[0022]
Further, as shown in FIG. 3, when the valve body 6 is switched to the third piece closing switching position C, one disk member 30a is similarly fitted to the inner peripheral side of the second protrusion 32, and the other The disc member 30 b is configured to fit into the inner peripheral side of the third protrusion 33.
[0023]
Hereinafter, the operation of the above configuration will be described.
(1) When the operator turns the operating handle to switch the valve body 6 to the first fully open switching position A as shown in FIG. 1, the first protrusion 31 is moved to the valve position as shown in FIG. Since it protrudes between the tip 8b of the first opening 8 of the body 6 and the inner surface of the valve box 2, it is formed between the tip 8b of the first opening 8 and the inner surface of the valve box 2. The gap is reduced by the first protrusion 31 over the entire circumference as compared with the conventional case. As a result, a part of the space S1 communicating with the both valve box sheets 12a and 12b from the first opening 8 through the outside of the valve body 6 is constricted by the first protrusion 31, so that the foreign matter is It is possible to almost prevent the entry into the space S1 from the one opening 8, and thus it is possible to prevent the sealing surfaces 13 of the two valve box sheets 12a and 12b from being damaged by foreign substances. In this case, a minute gap of about 2 mm to 4 mm is formed between the tip 8 b of the first opening 8 and the first protrusion 31.
[0024]
(2) Further, as shown in FIG. 2, when the valve body 6 is switched to the second piece closing switching position B, as shown in FIG. 5, one disk member 30a is connected to the inner periphery of the third protrusion 33. Part of the space S2 that communicates with the other valve box sheet 12b from the second and third openings 9, 10 through the outside of the valve body 6 to the one disk member 30a and the third It is narrowed by the protrusion 33. Thereby, foreign matter can almost be prevented from entering the space S2 from the second and third openings 9 and 10, and therefore the seal surface 13 of the other valve box seat 12b can be prevented from being damaged by the foreign matter. Can do.
[0025]
Furthermore, as shown in FIG. 6, since the other disk member 30b fits into the inner peripheral side of the second protrusion 32, it passes through the outside of the valve body 6 from the second and third openings 9, 10. A part of the space S3 communicating with one valve box sheet 12a is narrowed by the other disk member 30b and the second protrusion 32. Thereby, foreign matter can almost be prevented from entering the space S3 from the second and third openings 9 and 10, and therefore the seal surface 13 of one valve box seat 12a can be prevented from being damaged by the foreign matter. Can do. In this case, between the outer peripheral edge of one disk member 30a and the inner peripheral edge of the third protrusion 33, and between the outer peripheral edge of the other disk member 30b and the inner peripheral edge of the second protrusion 32. Each has a minute gap of about 2 mm to 4 mm.
[0026]
(3) Further, as shown in FIG. 3, when the valve body 6 is switched to the third piece closing switching position C, one disk member 30a is fitted to the inner peripheral side of the second protrusion 32, so that the first A part of the space S3 communicating with the one valve box sheet 12a from the second and third openings 9, 10 through the outside of the valve body 6 is narrowed by the one disk member 30a and the second protrusion 32. The Thereby, foreign matter can almost be prevented from entering the space S3 from the second and third openings 9 and 10, and therefore the seal surface 13 of one valve box seat 12a can be prevented from being damaged by the foreign matter. Can do.
[0027]
Furthermore, since the other disk member 30b fits into the inner peripheral side of the third protrusion 33, the second disc member 30b passes through the outside of the valve body 6 from the second and third openings 9, 10 to the other valve box seat 12b. A part of the communicating space S <b> 2 is narrowed by the other disk member 30 b and the third protrusion 33. Thereby, foreign matter can almost be prevented from entering the space S2 from the second and third openings 9 and 10, and therefore the seal surface 13 of the other valve box seat 12b can be prevented from being damaged by the foreign matter. Can do. In this case, between the outer peripheral edge of one disk member 30a and the inner peripheral edge of the second protrusion 32, and between the outer peripheral edge of the other disk member 30b and the inner peripheral edge of the third protrusion 33. Each has a minute gap of about 2 mm to 4 mm.
[0028]
As shown in the above (1) to (3), it is possible to prevent the seal surface 13 of each valve box sheet 12a, 12b from being damaged by foreign matter, so that the sealing performance is improved.
In the said embodiment, although the 1st-3rd projection parts 31-33 are welded to the inner surface of the valve box 2, it is not limited to welding, it is built up on the inner surface of the valve box 2, and is 1st. You may form the 1st-3rd projection parts 31-33.
[0029]
【The invention's effect】
As described above, according to the present invention, when the valve body is switched to each switching position, the pair of disk members provided on the valve body and the first to third protrusions provided on the inner surface of the valve box, The spaces communicating from the first to third openings of the valve body through the outside of the valve body to both valve box sheets are narrowed. Thereby, it can almost prevent that a foreign material enters into each said space from each said 1st-3rd opening part, Therefore, both valve box sheets can be prevented from being damaged by the said foreign material, and sealing performance is improves.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a three-way valve in an embodiment of the present invention, showing a state in which a valve body is switched to a first fully open switching position.
FIG. 2 is a cross-sectional view of the three-way valve, showing a state in which the valve body is switched to a second one-side closing switching position.
FIG. 3 is a cross-sectional view of the three-way valve, showing a state in which the valve body is switched to a third one-side closing switching position.
4 is a partially enlarged view of FIG. 1, wherein (a) is an enlarged view of a portion X in FIG. 1, and (b) is an enlarged view of a Y portion of FIG.
5 is a partially enlarged view of FIG. 2, wherein (a) is an enlarged view of a W portion in FIG. 2, and (b) is an enlarged view of an X portion in FIG.
6 is a partially enlarged view of FIG. 2, wherein (a) is an enlarged view of a Y portion in FIG. 2, and (b) is an enlarged view of a Z portion in FIG.
FIG. 7 is a view of the valve body of the three-way valve, and is a partial cross-sectional view seen from the axial center direction of the valve stem.
8 is a view taken along the line XX in FIG. 7. FIG.
9 is a view taken in the direction of arrows YY in FIG. 7;
10 is a ZZ arrow view in FIG. 7;
FIG. 11 is a cross-sectional view of a conventional three-way valve, showing a state in which the valve body is switched to the first fully open switching position.
FIG. 12 is a cross-sectional view of the three-way valve, showing a state in which the valve body is switched to the second one-side closing switching position.
FIG. 13 is a cross-sectional view of the three-way valve, showing a state in which the valve body is switched to the third piece closing switching position.
14 is a partially enlarged view of FIG. 11, where (a) is an enlarged view of a portion X in FIG. 11, and (b) is an enlarged view of a portion Y of FIG.
15 is a partially enlarged view of FIG. 12, where (a) is an enlarged view of a W portion of FIG. 12, and (b) is an enlarged view of an X portion of FIG.
16 is a partially enlarged view of FIG. 12, where (a) is an enlarged view of a Y portion in FIG. 12, and (b) is an enlarged view of a Z portion in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Three-way valve 2 Valve box 3-5 1st-3rd entrance / exit 3a 1st entrance / exit flow path axis 4a 2nd entrance / exit flow path axis 5a 3rd entrance / exit flow path axis 6 Valve body 8 -10 1st to 3rd opening part 8a Flow path axis 12a, 12b of 1st opening part Valve box sheet 14 Valve body sheet | seat 30a, 30b Disk member 31-33 1st-3rd protrusion part A 1st Fully open switching position B 2nd single closing switching position C 3rd single closing switching position S1 Space S2 communicating with both valve box seats from the first opening The second and third openings communicate with the other valve box seat Space S3 A space communicating from the second and third openings to one of the valve box seats

Claims

The valve box has first to third entrances, and in the valve box, a first fully open switching position where all the first to third entrances are opened and a second single closing switching position where only the second entrance is closed. And a third one-way closing position where only the third inlet / outlet is closed, and a three-way valve provided with a rotatable valve body, wherein the first fully opened switching position opens to the first inlet / outlet. An opening and a second opening that opens to the second doorway and a third opening that opens to the third doorway are formed in the valve body, and the second doorway side in the valve box In addition, one ring-shaped valve box seat centered on the flow path axis of the second inlet / outlet is provided, and on the third inlet / outlet side, a ring shape centered on the flow path axis of the third inlet / outlet The other valve box seat is provided, and when the valve body is switched to a pair of disk members and a second one-side closed switching position, A valve body sheet that is in pressure contact with the box sheet and is in pressure contact with the other valve box sheet when switched to the third single-closed switching position; , One disk member is disposed on the first opening side and the other disk member is disposed on the opposite side of the first opening, and the second disk member is disposed between the two disk members. An opening and a third opening are positioned, ring-shaped first to third protrusions are formed on the inner surface of the valve box, and the first protrusion is a flow path axis of the first inlet / outlet. And when the valve body is switched to the first fully open switching position, it projects between the tip of the first opening of the valve body and the inner surface of the valve box, and both valve box seats from the first opening. The second and third protrusions are centered on the flow path axis of the second and third inlets and outlets, and When the valve body is located between the two valve box seats and the valve body is switched to the second one-side closed switching position, one of the disk members fits into the inner peripheral side of the third protrusion, and the second and third A space communicating from the opening to the other valve box sheet is narrowed, and the other disk member is fitted into the inner peripheral side of the second protrusion, so that one valve box sheet is inserted from the second and third openings. When the valve element is switched to the third piece closed switching position, one disk member is fitted into the inner peripheral side of the second protrusion, and the second and third openings are closed. And the other disk member is fitted into the inner peripheral side of the third protrusion, and communicates with the other valve box sheet from the second and third openings. A three-way valve characterized by constricting the space to be performed.