JP4004979B2 - Rotation switching valve - Google Patents

Rotation switching valve Download PDF

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Publication number
JP4004979B2
JP4004979B2 JP2003064278A JP2003064278A JP4004979B2 JP 4004979 B2 JP4004979 B2 JP 4004979B2 JP 2003064278 A JP2003064278 A JP 2003064278A JP 2003064278 A JP2003064278 A JP 2003064278A JP 4004979 B2 JP4004979 B2 JP 4004979B2
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valve
valve body
port
flat surface
passage
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JP2004270851A (en
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眞爾 相原
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株式会社大阪ジャッキ製作所
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Description

【0001】
【発明の属する技術分野】
本発明は、例えばポンプとジャッキを備えた流体圧回路等に適用されて流体の切換制御に使用される回転切換弁の改良に関する。
【0002】
【従来の技術】
従来、この種の回転切換弁としては、例えば特許文献1及び2に記載されたものが知られている。
当該回転切換弁は、基本的には、内部に平坦面を備えた弁箱と、弁箱内に回転可能に設けられて弁箱の平坦面に対向する平坦面を備えた弁体と、弁箱を貫通して設けられて弁体を回転する為の弁棒と、弁箱に設けられて弁箱の平坦面に達する少なくとも三つの通路と、弁体に設けられて各通路を適宜連通する連通路と、弁箱に設けられて弁体の平坦面に常時当合すべく付勢されて通路と連通路を連通し得る弁座体と、から構成されている。
【0003】
この様なものは、弁体が回転されると、各通路が連通路に依って適宜連通されて流体が切換制御される。弁箱には、弁体の平坦面に常時当合すべく付勢されて通路と連通路を連通し得る弁座体が設けられているので、弁体の切換位置での通路と連通路を確実に連通する事ができる。
弁体の平坦面には、弁座体が当合されるだけなので、弁体と弁箱の平坦面どうしを当合させる場合に比べて、接触抵抗が減少して弁体の回転が容易に行なえると共に、通路と連通路との間のシール性能が向上する。
【0004】
【特許文献1】
特公昭50−12612号公報
【特許文献2】
特開2001−289338号公報
【0005】
【発明が解決しようとする課題】
ところが、この様なものは、弁体の切換位置では、弁座体に依り通路と連通路とを確実に連通させる事ができるものの、弁体の切換途中では、弁座体を介して通路と連通路とが跨った状態で連通されるので、加圧側の流体の圧力が瞬間的に抜けて加圧状態を維持する事ができなかった。
【0006】
とりわけ、図8に示した四ポート三位置型の回転切換弁に於ては、この事が著しかった。
つまり、同図に於て、加圧(最左側)位置から中立(中央)位置に切換える途中に於ては、加圧側であるポンプポートPがタンクポートTに接続されるだけでなく、加圧側である二次側第一ポートAもタンクポートTに接続されてしまい、これら加圧側の流体の圧力が瞬間的に抜けて加圧状態を維持する事ができなかった。
その結果、二次側に接続されたジャッキ等の流体圧機器の圧力や位置が維持できず、事故を招く惧れがあった。又、これを防止する為には、二次側にパイロットチェックバルブ等を併設せねばならなかった。
【0007】
本発明は、叙上の問題点に鑑み、これを解消する為に創案されたもので、その課題とする処は、パイロットチェックバルブ等を併設する必要がないと共に、切換途中で圧力が抜けない様にした回転切換弁を提供するにある。
【0008】
【課題を解決するための手段】
本発明の回転切換弁は、基本的には、内部に平坦面を備えた弁箱と、弁箱内に回転可能に設けられて弁箱の平坦面に対向する平坦面を備えた弁体と、弁箱を貫通して設けられて弁体を回転する為の弁棒と、弁箱に設けられて弁箱の平坦面に達する少なくとも三つの通路と、弁体に設けられて各通路を適宜連通する連通路と、弁箱に設けられて弁体の平坦面に常時当合すべく付勢されて通路と連通路を連通し得る弁座体と、弁箱に設けられて弁体の平坦面に常時当合すべく付勢されて弁体の切換途中では加圧側からの流体を遮断し得る遮断体と、から構成した事に特徴が存する。
【0009】
弁体が回転されると、各通路が連通路に依って適宜連通されて流体が切換制御される。
弁箱には、弁体の平坦面に常時当合すべく付勢されて通路と連通路を連通し得る弁座体が設けられているので、弁体の切換位置での通路と連通路とが確実に連通される。
弁箱には、弁体の平坦面に常時当合すべく付勢されて弁体の切換途中では加圧側からの流体を遮断し得る遮断体が設けられているので、弁体の切換途中で加圧側の流体の圧力が抜ける事がない。
【0010】
通路となるポンプポートは、弁体の回転中心に配されているのが好ましい。この様にすれば、タンクポートの位置の弁座体を省略できると共に、ポンプポートの位置の遮断体を省略できるので、構造の大幅な簡略化を図る事ができる。
【0011】
遮断体は、弁座体と同心状態に設けられているのが好ましい。この様にすれば、これらを所謂二重構造にできるので、製作が容易になる。
【0012】
【発明の実施の形態】
以下、本発明の実施の形態を、図面に基づいて説明する。
図1は、本発明の回転切換弁を示す縦断側面図。図2は、図1の平面図。図3は、弁体の中立位置を示す図1の3−3矢視横断平面図。図4は、弁体の加圧位置を示す図3と同様図。図5は、弁体の戻り位置を示す図3と同様図。図6は、本発明の回転切換弁を油圧記号で表した油圧記号図。図7は、図4の7−7矢視拡大縦断側面図である。
【0013】
回転切換弁1は、弁箱2、弁体3、弁棒4、通路5、連通路6、弁座体7、遮断体8とからその主要部が構成されて居り、この例では、回転式の四ポート三位置タンデムセンタ型にしてある。
【0014】
弁箱2は、内部に平坦面9を備えたもので、この例では、ポートブロック10と、この上に設けられたバルブボディ11と、この上に設けられたバルブカバー12と、これらの間に介設された適数のシール材(Оリング)13と、これらを合体する為の適数のボルト(六角穴付ボルト)14とを備えている。
バルブボディ11は、上方が開口した平面円状の弁室を備えて居り、これの底面が平坦面9を為している。バルブカバー12は、弁室の開口を閉塞するもので、その中心には、弁棒4を挿通する為の貫孔が穿設されている。
【0015】
弁体3は、弁箱2内に回転可能に設けられて弁箱2の平坦面9に対向する平坦面15を備えたもので、この例では、弁室より稍小径な円盤状を呈し、これの下面が平坦面15を為している。弁体3の平坦面15と弁箱2の平坦面9との間、並びに弁体3の外周面と弁箱2の内周面との間には、所定の間隙が形成されていると共に、弁体3の上面と弁箱2のバルブカバー12との間には、ベアリング(スラストニードルベアリング)16が介設されている。
【0016】
弁棒4は、弁箱2を貫通して設けられて弁体3を回転する為のもので、この例では、円柱状を呈して弁体3と同心状に且つ一体的に設けられていると共に、弁箱2のバルブカバー12の貫孔に挿通されて居り、その上部には、ボルト(六角穴付ボルト)とワッシャに依りハンドル17が取り付けられている。
弁棒4の上部とハンドル17のボス部には、夫々適合する廻り止め部が形成されていると共に、ハンドル17の先端には、握り部が形成されている。弁棒4と弁箱2のバルブカバー12との間には、ベアリング(深溝球軸受)18とシール材(Оリング)19が介設されている。
【0017】
弁箱2のバルブカバー12とハンドル17との間には、切換位置表示手段20と回転規制手段21と留置手段22が設けられている。
切換位置表示手段20は、弁体3の切換位置を表示するもので、ハンドル17のボス部に設けられた指針と、弁箱2のバルブカバー12に設けられて「加圧」と「中立」と「戻り」の文字が等角度毎に記載された指標板とを備えている。
回転規制手段21は、弁体3の回転を規制するもので、弁箱2のバルブカバー12に植設されたストッパピンと、ハンドル17のボス部に窪設されてハンドル17を「中立」を境にして夫々45度だけ回転した時には側面がストッパピンに当合してそれ以上の回転を阻止する窪所とを備えている。
留置(デテント)手段22は、弁体3を各切換位置つまり「加圧」と「中立」と「戻り」の位置に留置するもので、ハンドル17のボス部に設けられた収納穴と、これに昇降可能に収納されるボールと、収納穴に設けられてボールを下方に付勢するスプリング(コイルスプリング)と、各切換位置に対応して弁箱2のバルブカバー12に45度毎に窪設されてボールが嵌合し得る係止穴とを備えている。
【0018】
通路5は、弁箱2に設けられて弁箱2の平坦面9に達する少なくとも三つのもので、この例では、弁体3の回転中心に配されたポンプポートPと、ポンプポートPと同心円上に配されたタンクポートTと、ポンプポートPと同心円(前記同心円より小径)上で且つタンクポートTを挟んだ両側に45度つづ隔てて配された二次側第一ポートA及び二次側第二ポートBとの四つにされている。
ポンプポートPと二次側第一ポートAと二次側第二ポートBは、弁箱2のバルブボディ11とポートブロック10に跨って形成された垂直孔と、これに続いてポートブロック10に形成された水平孔と、これに続いてポートブロック10に形成されて側面に開口する螺孔とを備えている。タンクポートTは、弁箱2のバルブボディ11とポートブロック10に跨って形成された垂直孔と、これに続いてポートブロック10に形成されて下面に開口する螺孔とを備えている。タンクポートTの垂直孔は、これ以外のポートP,A,Bの垂直孔より大径にしてある。各ポートP,T,A,Bの螺孔には、図略しているが、配管が螺合されて接続される。
【0019】
連通路6は、弁体3に設けられて各通路5を適宜連通するもので、この例では、タンクポートTと二次側第一ポートAと二次側第二ポートBの何れか一つとポンプポートPとを連通し得る第一連通路23と、二次側第一ポートAとタンクポートTとを連通し得る第二連通路24と、二次側第二ポートBとタンクポートTとを連通し得る第三連通路25との三つにされている。
第一連通路23は、弁体3の下面に開口してポンプポートPに連通し得る垂直孔と、弁体3の下面に開口して二次側第一ポートA又は二次側第二ポートBに連通し得る垂直孔と、これらを連通する水平孔とを備えた略倒立U型を呈している。第二連通路24は、弁体3の下面に開口して二次側第一ポートAに連通し得る垂直孔と、弁体3の側面(外周面)に開口してタンクポートTに連通し得る水平孔とを備えた略倒立L型を呈している。第三連通路25は、弁体3の下面に開口して二次側第二ポートBに連通し得る垂直孔と、弁体3の側面(外周面)に開口してタンクポートTに連通し得る水平孔とを備えた略倒立L型を呈している。
【0020】
弁座体7は、弁箱2に設けられて弁体3の平坦面15に常時当合すべく付勢されて通路5と連通路6を連通し得るもので、この例では、ポンプポートPと二次側第一ポートAと二次側第二ポートBの各位置に設けられている。
弁座体7は、弁箱2のバルブボディ11に形成されて通路5と同心状で且つこれより大径な収容穴26と、これに昇降可能に収容されて上端が弁体3の平坦面15に当合し得る円筒状のシールパイプ27と、これを上方に付勢するスプリング(複数の皿バネ)28と、シールパイプ27とバルブボディ11との間に介設されたシール材(Оリング)29とを備えている。シールパイプ27の内径は、これが設けられる通路5と同径にされていると共に、シールパイプ27の上部には、弁体3の平坦面15との接触面積を減じる為に凹錐面30が形成されている。
【0021】
遮断体8は、弁箱2に設けられて弁体3の平坦面15に常時当合すべく付勢されて弁体3の切換途中では加圧側からの流体を遮断し得るもので、この例では、二次側第一ポートAと二次側第二ポートBの各位置に弁座体7と同心状態に設けられている。
遮断体8は、弁座体7の収容穴26の上部に形成されてこれと同心状で且つこれより大径な保持穴31と、これと弁座体7のシールパイプ27との間に昇降可能に設けられて上端が弁体3の平坦面15に当合し得る円筒状の大径パイプ32と、これの上端が弁体3の平坦面15に常時当合すべく上方に付勢するスプリング(複数の皿バネ)33と、大径パイプ32とバルブボディ11との間に介設されたシール材(Оリング)34とを備えている。大径パイプ32の上部には、弁体3の平坦面15との接触面積を減じる為に凹錐面35が形成されていると共に、大径パイプ32の内面には、これに背圧を掛ける為の上下に連通する断面略三角形の連通溝36が形成されている。大径パイプ32の外径は、大径パイプ32の半径からシートパイプ27の半径を減じた大きさが連通路6の垂直孔の大きさより大きくなる様に設定されている。
【0022】
次に、この様な構成に基づいてその作用を述解する。
図1乃至図3は、ハンドル17を操作して弁体3を中立位置にした場合を示している。この場合、弁体3は、図6の中央位置になり、ポンプからの流体は、通路5であるポンプポートP→連通路6である第一連通路23→弁体3と弁箱2との間→通路5であるタンクポートTを経てタンクに還流される。
この時、ポンプポートPには、弁座体7が設けられているので、これに依りポンプポートPと第一連通路23とは、常にシール状態が保たれて連通されていると共に、二次側第一ポートAと二次側第二ポートBには、弁座体7が設けられているものの、弁体3に依り閉塞されているので、これらは、タンクポートTに連通される事なく確実に閉止されている。
【0023】
図4及び図7は、ハンドル17を操作して弁体3を加圧位置にした場合を示している。この場合、弁体3は、図6の最左側位置になり、ポンプからの流体は、通路5であるポンプポートP→連通路6である第一連通路23→二次側第一ポートAに供給されると共に、二次側第二ポートBからの流体は、連通路6である第二連通路24→弁体3と弁箱2との間→通路5であるタンクポートTを経てタンクに還流される。
【0024】
図5は、ハンドル17を操作して弁体3を戻り位置にした場合を示している。この場合、弁体3は、図6の最右側位置になり、ポンプからの流体は、通路5であるポンプポートP→連通路6である第一連通路23→二次側第二ポートBに供給されると共に、二次側第一ポートAからの流体は、連通路6である第三連通路25→弁体3と弁箱2との間→通路5であるタンクポートTを経てタンクに還流される。
【0025】
弁箱2のポンプポートPと二次側第一ポートAと二次側第二ポートBの各位置には、弁座体7が設けられているので、弁体3の切換位置(中立位置、加圧位置、戻り位置)での通路5と連通路6を確実に連通する事ができる。
弁箱2の二次側第一ポートAと二次側第二ポートBの各位置には、遮断体8が設けられているので、弁体3の切換途中では加圧側からの流体、つまりポンプポートPに連通された連通路6からの流体や通路5である二次側第一ポートAからの流体が遮断される。
【0026】
例えば図3及び図7の鎖線で示す如く、ポンプポートPに連通された連通路6である第一連通路23が、二次側第一ポートAにある弁座体7の外側で且つ遮断体8の内側に位置した場合には、第一連通路23が二次側第一ポートAやタンクポートTに連通されずに遮断体8に依り閉塞される。この時、第一連通路23からの流体は、連通溝36を通って大径パイプ32の下面に作用するので、大径パイプ32は、スプリング33とこの背圧に依り上昇されて大径パイプ32と弁体3との間のシール効果が向上する。
又、図略しているが、ポンプポートPに連通された連通路6である第一連通路23が、二次側第一ポートAにある弁座体7に跨って位置した場合には、加圧側である第一連通路23や二次側第一ポートAからの流体が遮断体8に依り遮断されてタンクポートTに流出する事がない。その結果、とりわけ、二次側第一ポートAからの流体が抜ける事がなく、加圧状態を維持する事ができる。
勿論、連通路6である第一連通路23が、二次側第一ポートAにある遮断体8を跨って位置した場合には、第一連通路23の一部が遮断体8に依り閉塞されているものの、残部がタンクポートTに連通されているので、第一連通路23からの流体は、タンクに還流される。
【0027】
他の連通路6と弁座体7と遮断体8の関係も、前述と同様であるので、その詳細は割愛する。
この様に、弁箱2の二次側第一ポートAと二次側第二ポートBの各位置には、遮断体8が設けられているので、弁体3の切換途中では加圧側からの流体が遮断されて加圧側の流体の圧力が抜ける事がない。従って、パイロットチェックバルブ等を併設する必要がない。
【0028】
尚、回転切換弁1は、先の例では、四ポート三位置型であったが、これに限らず、例えばこれ以外の型式であっても良い。
回転切換弁1は、先の例では、手動操作式であったが、これに限らず、例えば弁棒4を駆動するアクチュエータを設けた動力操作式でも良い。
通路5は、先の例では、ポンプポートPとタンクポートTと二次側第一ポートAと二次側第二ポートBの四つであったが、これに限らず、例えばポンプポートPとタンクポートTと二次側第一ポートAの三つでも良い。
タンクポートTは、先の例では、ポンプポートPと対峙する位置に設けたが、これに限らず、例えば任意の位置に設けても良い。
弁座体7は、先の例では、タンクポートTには設けていなかったが、これに限らず例えばタンクポートTに設けても良い。
遮断体8は、先の例では、二次側第一ポートAと二次側第二ポートBに設けたが、これに限らず、例えばこれらの何れか一方だけに設けても良い。
遮断体8は、先の例では、ポンプポートPには設けていなかったが、これに限らず、例えばポンプポートPが弁体3の回転中心以外の箇所にある場合には、設けるのが望ましい。
【0029】
【発明の効果】
以上、既述した如く、本発明に依れば、次の様な優れた効果を奏する事ができる。
(1) 弁箱、弁体、弁棒、通路、連通路、弁座体、遮断体とで構成し、とりわけ弁体の平坦面に常時当合すべく付勢されて弁体の切換途中では加圧側からの流体を遮断し得る遮断体を設けたので、パイロットチェックバルブ等を併設する必要がないと共に、切換途中で圧力が抜けない様にする事ができる。
(2) 弁体の平坦面に常時当合すべく付勢されて弁体の切換途中では加圧側からの流体を遮断し得る遮断体を設けるだけであるので、比較的構造が簡単で、既存のものにも容易に適用する事ができる。
【図面の簡単な説明】
【図1】本発明の回転切換弁を示す縦断側面図。
【図2】図1の平面図。
【図3】弁体の中立位置を示す図1の3−3矢視横断平面図。
【図4】弁体の加圧位置を示す図3と同様図。
【図5】弁体の戻り位置を示す図3と同様図。
【図6】本発明の回転切換弁を油圧記号で表した油圧記号図。
【図7】図4の7−7矢視拡大縦断側面図。
【図8】本発明に対応する従来の回転切換弁を油圧記号で表した油圧記号図。
【符号の説明】
1…回転切換弁、2…弁箱、3…弁体、4…弁棒、5…通路、6…連通路、7…弁座体、8…遮断体、9…平坦面、10…ポートブロック、11…バルブボディ、12…バルブカバー、13…シール材、14…ボルト、15…平坦面、16…ベアリング、17…ハンドル、18…ベアリング、19…シール材、20…切換位置表示手段、21…回転規制手段、22…留置手段、23…第一連通路、24…第二連通路、25…第三連通路、26…収容穴、27…シールパイプ、28…スプリング、29…シール材、30…凹錐面、31…保持穴、32…大径パイプ、33…スプリング、34…シール材、35…凹錐面、36…連通溝、P…ポンプポート、T…タンクポート、A…二次側第一ポート、B…二次側第二ポート。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a rotary switching valve that is applied to, for example, a fluid pressure circuit including a pump and a jack and used for fluid switching control.
[0002]
[Prior art]
Conventionally, as this type of rotation switching valve, for example, those described in Patent Documents 1 and 2 are known.
The rotation switching valve basically includes a valve box having a flat surface inside, a valve body that is rotatably provided in the valve box and has a flat surface facing the flat surface of the valve box, and a valve A valve rod that is provided through the box to rotate the valve body, at least three passages that are provided in the valve box and reach the flat surface of the valve box, and each passage that is provided in the valve body communicates appropriately. It is comprised from the communicating path and the valve seat body which is provided in the valve box and is urged | biased to always contact | connect the flat surface of a valve body, and can connect a passage and a communicating path.
[0003]
In such a case, when the valve body is rotated, the passages are appropriately communicated with each other through the communication passages, and the fluid is controlled to be switched. The valve box is provided with a valve seat body that is urged so as to be in constant contact with the flat surface of the valve body so as to allow the passage and the communication path to communicate with each other. You can communicate reliably.
Since the valve seat is only in contact with the flat surface of the valve body, contact resistance is reduced and the valve body can be rotated more easily than when the flat surfaces of the valve body and the valve box are in contact with each other. In addition, the sealing performance between the passage and the communication passage is improved.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 50-12612 [Patent Document 2]
JP-A-2001-289338
[Problems to be solved by the invention]
However, in such a case, at the switching position of the valve body, the passage and the communication path can be reliably communicated depending on the valve seat body. Since the communication is made in a state where the communication path is straddled, the pressure of the fluid on the pressurizing side is momentarily released and the pressurized state cannot be maintained.
[0006]
In particular, this was remarkable in the four-port three-position rotary switching valve shown in FIG.
That is, in the same figure, in the middle of switching from the pressurization (leftmost) position to the neutral (center) position, not only the pump port P on the pressurization side is connected to the tank port T but also the pressurization side The secondary side first port A is also connected to the tank port T, and the pressure of the fluid on the pressurizing side is instantaneously released and the pressurized state cannot be maintained.
As a result, the pressure and position of a fluid pressure device such as a jack connected to the secondary side cannot be maintained, which may lead to an accident. In order to prevent this, a pilot check valve or the like must be provided on the secondary side.
[0007]
The present invention was devised in view of the above-mentioned problems, and was devised to solve this problem. The problem is that a pilot check valve or the like is not required and pressure does not escape during switching. It is in providing the rotation switching valve which was made.
[0008]
[Means for Solving the Problems]
The rotation switching valve of the present invention basically includes a valve box having a flat surface inside, and a valve body having a flat surface that is rotatably provided in the valve box and faces the flat surface of the valve box. , A valve rod provided through the valve box for rotating the valve body, at least three passages provided in the valve box reaching the flat surface of the valve box, and each passage provided in the valve body as appropriate A communicating passage, a valve seat that is provided in the valve box and is urged so as to be in constant contact with the flat surface of the valve body, and the passage and the communication path can communicate with each other; and a flat valve body provided in the valve box. It is characterized in that it is constituted by a shut-off body that is always energized to meet the surface and can shut off the fluid from the pressurizing side during the switching of the valve body.
[0009]
When the valve body is rotated, the passages are appropriately communicated with each other through the communication passages, and the fluid is controlled to be switched.
The valve box is provided with a valve seat body that is urged so as to be in constant contact with the flat surface of the valve body so as to allow the passage and the communication path to communicate with each other. Is reliably communicated.
The valve box is provided with a shut-off body that is always urged to contact the flat surface of the valve body and can shut off the fluid from the pressurizing side during the switching of the valve body. The pressure of the fluid on the pressurization side does not escape
[0010]
The pump port serving as the passage is preferably disposed at the center of rotation of the valve body. In this way, the valve seat at the tank port position can be omitted, and the blocking body at the pump port position can be omitted, so that the structure can be greatly simplified.
[0011]
The blocking body is preferably provided concentrically with the valve seat body. In this way, since these can be formed into a so-called double structure, manufacture becomes easy.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal side view showing a rotation switching valve of the present invention. FIG. 2 is a plan view of FIG. 3 is a cross-sectional plan view taken along arrow 3-3 in FIG. 1 showing a neutral position of the valve body. FIG. 4 is a view similar to FIG. 3 showing the pressure position of the valve body. FIG. 5 is a view similar to FIG. 3 showing the return position of the valve body. FIG. 6 is a hydraulic symbol diagram representing the rotation switching valve of the present invention with a hydraulic symbol. FIG. 7 is an enlarged vertical side view taken along arrow 7-7 in FIG.
[0013]
The rotation switching valve 1 is composed mainly of a valve box 2, a valve body 3, a valve rod 4, a passage 5, a communication passage 6, a valve seat body 7, and a shut-off body 8. In this example, the rotary switching valve 1 is a rotary type. 4 port 3 position tandem center type.
[0014]
The valve box 2 has a flat surface 9 inside. In this example, the port block 10, the valve body 11 provided on the port block 10, the valve cover 12 provided on the port block 10, and the space between them are provided. A proper number of sealing materials (O-rings) 13 interposed between the two and an appropriate number of bolts (hexagon socket head cap bolts) 14 for combining them are provided.
The valve body 11 includes a planar circular valve chamber that is open at the top, and the bottom surface of the valve body 11 forms a flat surface 9. The valve cover 12 closes the opening of the valve chamber, and a through-hole for inserting the valve rod 4 is formed in the center thereof.
[0015]
The valve body 3 is provided with a flat surface 15 that is rotatably provided in the valve box 2 and faces the flat surface 9 of the valve box 2. In this example, the valve body 3 has a disk shape smaller in diameter than the valve chamber, The lower surface of this forms a flat surface 15. A predetermined gap is formed between the flat surface 15 of the valve body 3 and the flat surface 9 of the valve box 2, and between the outer peripheral surface of the valve body 3 and the inner peripheral surface of the valve box 2, A bearing (a thrust needle bearing) 16 is interposed between the upper surface of the valve body 3 and the valve cover 12 of the valve box 2.
[0016]
The valve stem 4 is provided through the valve box 2 to rotate the valve body 3. In this example, the valve rod 4 has a cylindrical shape and is provided concentrically and integrally with the valve body 3. At the same time, it is inserted through a through hole of the valve cover 12 of the valve box 2, and a handle 17 is attached to the upper part of the valve cover 2 by bolts (hexagon socket head bolts) and washers.
The upper portion of the valve stem 4 and the boss portion of the handle 17 are respectively formed with suitable rotation stoppers, and the handle 17 is formed with a grip portion at the tip. Between the valve stem 4 and the valve cover 12 of the valve box 2, a bearing (deep groove ball bearing) 18 and a sealing material (O-ring) 19 are interposed.
[0017]
Between the valve cover 12 and the handle 17 of the valve box 2, a switching position display means 20, a rotation restricting means 21, and an indwelling means 22 are provided.
The switching position display means 20 displays the switching position of the valve body 3. The switching position display means 20 is provided on the boss portion of the handle 17 and the valve cover 12 of the valve box 2 and is “pressurized” and “neutral”. And an indicator plate on which characters “return” are written at equal angles.
The rotation restricting means 21 restricts the rotation of the valve body 3. The rotation restricting means 21 is recessed in the stopper pin implanted in the valve cover 12 of the valve box 2 and the boss portion of the handle 17 so that the handle 17 is separated from the “neutral” position. Each side is provided with a recess that prevents the rotation further when the side faces the stopper pin when rotated by 45 degrees.
The detent means 22 detains the valve body 3 in each switching position, that is, in the “pressurization”, “neutral” and “return” positions, and a storage hole provided in the boss portion of the handle 17, And a spring (coil spring) that is provided in the storage hole and biases the ball downward, and is recessed in the valve cover 12 of the valve box 2 every 45 degrees corresponding to each switching position. And a locking hole into which the ball can be fitted.
[0018]
There are at least three passages 5 provided in the valve box 2 and reaching the flat surface 9 of the valve box 2. In this example, the pump port P disposed at the center of rotation of the valve body 3 and a concentric circle with the pump port P are provided. The tank port T arranged on the upper side, the secondary side first port A and the secondary arranged on the concentric circle (smaller diameter than the concentric circle) with the pump port P and separated by 45 degrees on both sides sandwiching the tank port T It is divided into four with the side second port B.
The pump port P, the secondary side first port A, and the secondary side second port B are formed in a vertical hole formed across the valve body 11 and the port block 10 of the valve box 2, and subsequently to the port block 10. A horizontal hole is formed, followed by a screw hole formed in the port block 10 and opened to the side surface. The tank port T includes a vertical hole formed across the valve body 11 and the port block 10 of the valve box 2 and a screw hole formed in the port block 10 and opened to the lower surface. The vertical hole of the tank port T has a larger diameter than the vertical holes of the other ports P, A, and B. Although not shown, pipes are screwed and connected to the screw holes of the ports P, T, A, and B.
[0019]
The communication passage 6 is provided in the valve body 3 and communicates with each passage 5 as appropriate. In this example, any one of the tank port T, the secondary side first port A, and the secondary side second port B is provided. A first series passage 23 capable of communicating with the pump port P, a second communication passage 24 capable of communicating the secondary side first port A and the tank port T, a secondary side second port B and the tank port T; And a third communication passage 25 that can communicate with each other.
The first series passage 23 has a vertical hole that opens to the lower surface of the valve body 3 and communicates with the pump port P, and opens to the lower surface of the valve body 3 to open the secondary side first port A or the secondary side second port. A substantially inverted U shape having a vertical hole that can communicate with B and a horizontal hole that communicates with B is provided. The second communication passage 24 opens to the lower surface of the valve body 3 and communicates with the secondary side first port A, and opens to the side surface (outer peripheral surface) of the valve body 3 to communicate with the tank port T. It has a substantially inverted L shape with a horizontal hole to be obtained. The third communication passage 25 opens to the lower surface of the valve body 3 and communicates with the secondary second port B, and opens to the side surface (outer peripheral surface) of the valve body 3 and communicates with the tank port T. It has a substantially inverted L shape with a horizontal hole to be obtained.
[0020]
The valve seat body 7 is provided in the valve box 2 and is urged so as to be in constant contact with the flat surface 15 of the valve body 3 so that the passage 5 and the communication passage 6 can communicate with each other. In this example, the pump port P And secondary side first port A and secondary side second port B.
The valve seat body 7 is formed in the valve body 11 of the valve box 2 and is concentric with the passage 5 and has a larger diameter accommodation hole 26, and is accommodated so as to be movable up and down. The upper end is a flat surface of the valve body 3. 15, a cylindrical seal pipe 27 that can be engaged with the spring 15, a spring (a plurality of disc springs) 28 that urges the seal pipe 27 upward, and a seal material (О) interposed between the seal pipe 27 and the valve body 11. Ring) 29. The inner diameter of the seal pipe 27 is the same as that of the passage 5 in which the seal pipe 27 is provided, and a concave conical surface 30 is formed on the upper portion of the seal pipe 27 in order to reduce the contact area with the flat surface 15 of the valve body 3. Has been.
[0021]
The shut-off body 8 is provided in the valve box 2 and is urged so as to be in constant contact with the flat surface 15 of the valve body 3, and can shut off the fluid from the pressurizing side during the switching of the valve body 3. Then, the valve seat body 7 is provided concentrically at each position of the secondary side first port A and the secondary side second port B.
The blocking body 8 is formed at the upper part of the accommodation hole 26 of the valve seat body 7, and is lifted and lowered between the holding hole 31 that is concentric with the holding hole 31 and the seal pipe 27 of the valve seat body 7. A cylindrical large-diameter pipe 32 which is provided so that its upper end can be brought into contact with the flat surface 15 of the valve body 3 and its upper end is urged upward so as to always come into contact with the flat surface 15 of the valve body 3. A spring (a plurality of disc springs) 33 and a sealing material (O-ring) 34 interposed between the large-diameter pipe 32 and the valve body 11 are provided. A concave conical surface 35 is formed on the upper portion of the large-diameter pipe 32 in order to reduce the contact area with the flat surface 15 of the valve element 3, and back pressure is applied to the inner surface of the large-diameter pipe 32. For this purpose, a communication groove 36 having a substantially triangular cross section communicating with the upper and lower sides is formed. The outer diameter of the large-diameter pipe 32 is set so that the size obtained by subtracting the radius of the seat pipe 27 from the radius of the large-diameter pipe 32 is larger than the size of the vertical hole of the communication path 6.
[0022]
Next, the operation will be described based on such a configuration.
1 to 3 show a case where the valve body 3 is set to the neutral position by operating the handle 17. In this case, the valve body 3 is located at the center position in FIG. 6, and the fluid from the pump flows between the pump port P that is the passage 5 → the first series passage 23 that is the communication path 6 → the valve body 3 and the valve box 2. The gas is returned to the tank through the tank port T which is the intermediate passage 5.
At this time, since the valve seat 7 is provided in the pump port P, the pump port P and the first series passage 23 are always kept in communication with each other while maintaining a sealed state. Although the valve seat body 7 is provided in the side first port A and the secondary side second port B, they are closed by the valve body 3, so that they are not communicated with the tank port T. It is securely closed.
[0023]
4 and 7 show the case where the handle 17 is operated to place the valve body 3 in the pressurizing position. In this case, the valve body 3 is in the leftmost position in FIG. 6, and the fluid from the pump flows from the pump port P that is the passage 5 to the first series passage 23 that is the communication passage 6 → the secondary side first port A. The fluid from the secondary side second port B is supplied to the tank via the second communication path 24 which is the communication path 6 → between the valve body 3 and the valve box 2 → the tank port T which is the path 5. Refluxed.
[0024]
FIG. 5 shows a case where the valve body 3 is set to the return position by operating the handle 17. In this case, the valve body 3 is in the rightmost position in FIG. 6, and the fluid from the pump flows from the pump port P which is the passage 5 to the first series passage 23 which is the communication passage 6 → the secondary side second port B. The fluid from the secondary side first port A is supplied to the tank via the third communication passage 25 that is the communication passage 6 → between the valve body 3 and the valve box 2 → the tank port T that is the passage 5. Refluxed.
[0025]
Since the valve seat body 7 is provided at each position of the pump port P, the secondary side first port A, and the secondary side second port B of the valve box 2, the switching position (neutral position, The passage 5 and the communication passage 6 at the pressurization position and the return position can be reliably communicated with each other.
Since the blocking body 8 is provided at each position of the secondary side first port A and the secondary side second port B of the valve box 2, the fluid from the pressurizing side, that is, the pump during the switching of the valve body 3 The fluid from the communication passage 6 communicated with the port P and the fluid from the secondary first port A which is the passage 5 are blocked.
[0026]
For example, as shown by the chain line in FIGS. 3 and 7, the first series passage 23, which is the communication passage 6 communicated with the pump port P, is outside the valve seat body 7 at the secondary side first port A and is a blocking body. 8, the first series passage 23 is closed by the blocking body 8 without communicating with the secondary side first port A or the tank port T. At this time, since the fluid from the first series passage 23 acts on the lower surface of the large-diameter pipe 32 through the communication groove 36, the large-diameter pipe 32 is lifted by the spring 33 and this back pressure, and the large-diameter pipe. The sealing effect between 32 and the valve body 3 is improved.
Although not shown, when the first series passage 23, which is the communication passage 6 communicated with the pump port P, is located across the valve seat body 7 in the secondary side first port A, the additional passage The fluid from the first series passage 23 on the pressure side and the secondary side first port A is blocked by the blocking body 8 and does not flow out to the tank port T. As a result, in particular, the fluid from the secondary side first port A does not escape, and the pressurized state can be maintained.
Of course, when the first series passage 23 that is the communication path 6 is located across the blocking body 8 at the secondary side first port A, a part of the first series passage 23 is blocked by the blocking body 8. Although the remaining portion communicates with the tank port T, the fluid from the first series passage 23 is returned to the tank.
[0027]
Since the relationship between the other communication path 6, the valve seat body 7, and the blocking body 8 is the same as described above, the details thereof are omitted.
As described above, since the blocking body 8 is provided at each position of the secondary side first port A and the secondary side second port B of the valve box 2, the switching from the pressure side during the switching of the valve body 3 is performed. The fluid is shut off and the pressure of the fluid on the pressurizing side does not escape. Therefore, there is no need to provide a pilot check valve or the like.
[0028]
Although the rotation switching valve 1 is a four-port three-position type in the previous example, the rotation switching valve 1 is not limited to this and may be, for example, other types.
In the previous example, the rotation switching valve 1 was manually operated. However, the rotation switching valve 1 is not limited thereto, and may be, for example, a power operated type provided with an actuator for driving the valve rod 4.
In the previous example, there are four passages 5 including the pump port P, the tank port T, the secondary side first port A, and the secondary side second port B. There may be three tank ports T and secondary side first port A.
In the previous example, the tank port T is provided at a position facing the pump port P. However, the tank port T is not limited thereto, and may be provided at an arbitrary position, for example.
The valve seat body 7 is not provided in the tank port T in the previous example, but is not limited thereto, and may be provided in the tank port T, for example.
In the previous example, the blocking body 8 is provided in the secondary side first port A and the secondary side second port B, but is not limited thereto, and may be provided only in any one of them.
The blocking body 8 is not provided in the pump port P in the previous example, but is not limited thereto. For example, when the pump port P is located at a position other than the rotation center of the valve body 3, it is desirable to provide the blocking body 8. .
[0029]
【The invention's effect】
As described above, according to the present invention, the following excellent effects can be obtained.
(1) Consists of a valve box, a valve body, a valve stem, a passage, a communication passage, a valve seat body, and a shut-off body. In particular, the valve body is energized so as to be in constant contact with the flat surface of the valve body. Since a blocking body capable of blocking the fluid from the pressurizing side is provided, it is not necessary to provide a pilot check valve or the like, and it is possible to prevent pressure from being released during switching.
(2) Since it is only necessary to provide a shut-off body that is always energized to contact the flat surface of the valve body and can shut off the fluid from the pressurizing side during the switching of the valve body, the structure is relatively simple, It can be easily applied to those.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing a rotation switching valve of the present invention.
FIG. 2 is a plan view of FIG.
3 is a cross-sectional plan view taken along the arrow 3-3 in FIG. 1 showing a neutral position of the valve body.
4 is a view similar to FIG. 3 showing a pressure position of the valve body.
FIG. 5 is a view similar to FIG. 3 showing the return position of the valve body.
FIG. 6 is a hydraulic symbol diagram representing the rotation switching valve of the present invention with a hydraulic symbol.
7 is an enlarged vertical side view taken along the line 7-7 in FIG. 4;
FIG. 8 is a hydraulic symbol diagram representing a conventional rotation switching valve corresponding to the present invention by a hydraulic symbol.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotary switching valve, 2 ... Valve box, 3 ... Valve body, 4 ... Valve rod, 5 ... Passage, 6 ... Communication passage, 7 ... Valve seat body, 8 ... Shut off body, 9 ... Flat surface, 10 ... Port block , 11 ... Valve body, 12 ... Valve cover, 13 ... Sealing material, 14 ... Bolt, 15 ... Flat surface, 16 ... Bearing, 17 ... Handle, 18 ... Bearing, 19 ... Sealing material, 20 ... Switching position display means, 21 Rotation regulating means, 22 ... Detention means, 23 ... First series passage, 24 ... Second communication passage, 25 ... Third communication passage, 26 ... Housing hole, 27 ... Seal pipe, 28 ... Spring, 29 ... Sealing material, 30 ... Concave surface, 31 ... Holding hole, 32 ... Large diameter pipe, 33 ... Spring, 34 ... Seal material, 35 ... Conical surface, 36 ... Communication groove, P ... Pump port, T ... Tank port, A ... Two Secondary side first port, B ... Secondary side second port.

Claims (1)

内部に平坦面を備えた弁箱と、弁箱内に回転可能に設けられて弁箱の平坦面に対向する平坦面を備えた弁体と、弁箱を貫通して設けられて弁体を回転する為の弁棒と、弁箱に設けられて弁箱の平坦面に達する少なくとも三つの通路と、弁体に設けられて各通路を適宜連通する連通路と、弁箱に設けられて弁体の平坦面に常時当合すべく付勢されて通路と連通路を連通し得る弁座体と、弁箱に設けられて弁体の平坦面に常時当合すべく付勢されて弁体の切換途中では加圧側からの流体を遮断し得る遮断体と、から構成し、弁座体は、弁箱のバルブボディに形成されて通路と同心状で且つこれより大径な収容穴と、これに昇降可能に収容されて上端が弁体の平坦面に当合し得る筒状のシールパイプと、これを上方に付勢するスプリングと、シールパイプとバルブボディとの間に介設されたシール材とを備えていると共に、遮断体は、弁座体の収容穴と同心状で且つこれより大径な保持穴と、これと弁座体のシールパイプとの間に昇降可能に設けられて上端が弁体の平坦面に当合し得る筒状の大径パイプと、これの上端が弁体の平坦面に常時当合すべく上方に付勢するスプリングと、大径パイプとバルブボディとの間に介設されたシール材とを備えている事を特徴する回転切換弁。A valve box having a flat surface inside, a valve body having a flat surface rotatably provided in the valve box and facing the flat surface of the valve box, and a valve body provided through the valve box. A valve rod for rotation, at least three passages provided in the valve box and reaching the flat surface of the valve box, a communication path provided in the valve body and appropriately communicating each passage, and a valve provided in the valve box A valve seat body that is urged to be in constant contact with the flat surface of the body and communicates the passage and the communication passage; and a valve body that is provided in the valve box and is urged to always contact with the flat surface of the valve body The valve seat body is formed in the valve body of the valve box, is concentric with the passage, and has a larger diameter accommodation hole. A cylindrical seal pipe that can be moved up and down and the upper end of which can be brought into contact with the flat surface of the valve body, a spring that biases the pipe upward, and a seal And a sealing member interposed between the valve body and the valve body, the blocking body being concentric with the accommodating hole of the valve seat body and having a larger diameter than the holding hole, and the valve seat body A cylindrical large-diameter pipe that can be moved up and down between the upper and lower seal pipes so that the upper end can be in contact with the flat surface of the valve body, and the upper end of the pipe is always in the upper direction so that the flat surface of the valve body is in contact A rotary switching valve characterized by comprising an urging spring and a sealing material interposed between the large-diameter pipe and the valve body .
JP2003064278A 2003-03-11 2003-03-11 Rotation switching valve Expired - Fee Related JP4004979B2 (en)

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