JP2004225589A - Water stop valve opening and closing device for hydraulic machinery - Google Patents

Water stop valve opening and closing device for hydraulic machinery Download PDF

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JP2004225589A
JP2004225589A JP2003013221A JP2003013221A JP2004225589A JP 2004225589 A JP2004225589 A JP 2004225589A JP 2003013221 A JP2003013221 A JP 2003013221A JP 2003013221 A JP2003013221 A JP 2003013221A JP 2004225589 A JP2004225589 A JP 2004225589A
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pressure
pressure oil
valve
water
hydraulic
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Tadanori Shioura
忠則 塩浦
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Toshiba Corp
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Toshiba Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
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Abstract

<P>PROBLEM TO BE SOLVED: To surely close a water stop valve even when hydraulic pressure in a hydraulic pump is lost instantaneously. <P>SOLUTION: This device is provided with an accumulator 6 provided with branching from a oil feed line 21 connecting a pressure oil tank 1 and a solenoid valve 2 and storing pressure oil from the pressure oil tank 1, and a check valve 7 preventing pressure oil stored in the accumulator 6 from flowing reversely into the pressure oil tank 1. Consequently, the water stop valve 5 can be surely closed by pressure oil stored in the accumulator 6 even when pressure oil in the pressure oil tank 1 is lost instantaneously. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、水車又はポンプ水車等の水力機械に供給される水の止水制御を行う止水弁開閉装置に関する。
【０００２】
【従来の技術】
特許文献１に示されるように、水力発電所におけるポンプ水車等においては、図７に示すような水圧操作方式の止水弁開閉装置が用いられている（特許文献１の図１を参照）。
【０００３】
この止水弁開閉装置は、圧油を貯留する圧油タンク１、該圧油タンク１から供給される圧油の流路を切替える電磁弁２、圧油により駆動されて鉄管水（圧力水）の流路を切替える配圧弁３、鉄管水を作動流体として駆動されるサーボモータ４を有して、給油ライン２１及び給水ライン２２により圧油や鉄管水が流動するようになっている。
【０００４】
配圧弁３は、ピストン部１３と弁部１４とにより構成されて、配圧弁３のピストン部１３及びサーボモータ４はそれぞれピストン３ａ，４ａを有している。
【０００５】
そして、ピストン３ａ，４ａによりシリンダ３ｂ，４ｂは、２の部屋３ｃ，３ｄ，４ｃ，４ｄにそれぞれ区画されて、一方の部屋に圧油又は鉄管水が供給されることによりピストン３ａ，４ａが他方の部屋に向って移動するようになっている。
【０００６】
以下説明の都合から、部屋３ｃ，４ｃを停止部屋３ｃ，４ｃと記載し、部屋３ｄ，４ｄを運転部屋３ｄ，４ｄと記載する。
【０００７】
なお、図７においては、止水弁５を閉鎖する際の圧油及び鉄管水の流動方向を実線矢印で示し、止水弁５を開放する際の圧油及び鉄管水の流動方向を点線矢印で示している。従って、図７は止水弁５を閉じるときの状態を示している。
【０００８】
このような構成で、図示しない調速機等の制御装置からの運転指令により電磁弁２が動作して開方向に切換わる。
【０００９】
これにより、圧油タンク１からの圧油は、配圧弁３の運転部屋３ｄに供給されるようになり、ピストン３ａが停止部屋３ｃ側に移動して、弁部１４が鉄管水の流路を実線矢印方向から点線矢印方向に切変える。なお、停止部屋３ｃに貯留していた圧油は排油ライン２３から排油される。
【００１０】
鉄管水の流路が切変ることにより、当該鉄管水はサーボモータ４の運転部屋４ｄに供給されるようになって、ピストン４ａは停止部屋４ｃ側に移動する。
【００１１】
これにより、当該ピストン４ａに連結されたロッド４ｅが止水弁５のクランク５ｂを駆動して、弁５ａを止水弁座５ｃから離して水車又はポンプ水車に水が供給されるようになる。
【００１２】
一方、このような給水が行われている状態から給水を停止する場合には、調速機等の制御装置からの停止指令が電磁弁２に出力されて、上述した圧油及び鉄管水の流動方向が逆になって給水が停止される。
【００１３】
【特許文献１】
特開昭５５−３６６２９号公報
【００１４】
【発明が解決しようとする課題】
しかしながら、上記構成は少なくとも圧油タンク１内が所定の圧力を保っていることを前提としているため、当該圧油タンク１内の圧力が不足すると正常に動作しなくなる問題があった。
【００１５】
例えば、圧油タンク１に亀裂が生じて略瞬時に圧力が喪失し、これにより制御装置からの停止指令が電磁弁２に出力された場合を考える。
【００１６】
この場合、電磁弁２は停止指令に従い圧油の流路を切替えるが、圧力の低下した圧油ではピストン３ａを移動させることができないので鉄管水の流路が切りかわらない。従って、サーボモータ４も駆動されないので、止水弁５は動作せず水車又はポンプ水車への給水を停止することができなくなってしまう。
【００１７】
そこで、本発明は、圧油タンクの油圧が瞬時に喪失した場合であっても、確実に止水弁を閉弁操作できるようにして水車又はポンプ水車を安全、かつ、確実に停止できるようにした水力機械の止水弁開閉装置を提供することを目的とする。
【００１８】
【課題を解決するための手段】
上記課題を解決するため、請求項１にかかる発明は、作動流体の液圧によってピストンを作動して止水弁を開閉させるサーボモータと、油圧により駆動されてサーボモータへの作動流体の供給経路を切り替える配圧弁と、該配圧弁を駆動する油圧を生じさせる圧油を生じさせる圧油の流路を切り替える電磁弁と、該電磁弁を介して配圧弁に圧油を供給する圧油タンクとを有する水力機械の止水弁開閉装置において、圧油タンクと電磁弁とを連結する圧油配管の途中に、圧油が圧油タンクに逆流することを防ぐ逆流防止器を設けるとともに、該圧油タンクからの圧油を貯留するアキュムレータをこの逆流防止器と電磁弁との間の圧油配管から分岐して設けることを特徴とする。
【００１９】
請求項２にかかる発明は、請求項１に記載の水力機械の止水弁開閉装置において、さらに圧油タンク内の圧力を検出する圧力検出スイッチを設け、逆流防止器を該圧力検出スイッチにて圧油タンク内の圧力が予め定められた値以下となったときに流路を閉止する電磁弁としたことを特徴とする。
【００２０】
請求項３にかかる発明は、作動流体の液圧によってピストンを作動して止水弁を開閉させるサーボモータと、油圧により駆動されてサーボモータへの作動流体の供給経路を切り替える配圧弁と、該配圧弁を駆動する油圧を生じさせる圧油の流路を切り替える電磁弁と、該電磁弁を介して配圧弁に圧油を供給する圧油タンクとを有する水力機械の止水弁開閉装置において、
配圧弁を止水弁が閉鎖する方向の作動流体の供給経路に切り替える方向で、かつ配圧弁を駆動する油圧による力より小さい力で、当該配圧弁を常時付勢する補助装置を設けたことを特徴とする。
【００２１】
請求項４にかかる発明は、請求項３に記載の水力機械の止水弁開閉装置において、補助装置は、水力機械に供給される圧力水の圧力によって駆動される補助ピストンであることを特徴とする。
【００２２】
【発明の実施の形態】
本発明の第１の実施の形態を図を参照して説明する。なお、従来と同一構成に関しては、同一符号を付して説明を適宜省略する。
【００２３】
図１は、本実施の形態に係る水力機械の止水弁開閉装置の構成を示す図で、圧油を貯留する圧油タンク１、該圧油タンク１から供給される圧油の流路を切替える電磁弁２、圧油により駆動されて鉄管水の流路を切替える配圧弁３、鉄管水により駆動されるサーボモータ４、圧油タンク１と電磁弁２とを連結する圧油配管１０に分岐して設けられて、該圧油タンク１からの圧油を貯留する蓄圧器であるアキュームレータ６、該アキュームレータ６に貯留された圧油が圧油タンク１に逆流しないようにする逆流防止器である逆止弁７を有している。
【００２４】
配圧弁３は、ピストン部１３と弁部１４とにより構成されて、配圧弁３のピストン部１３及びサーボモータ４はそれぞれピストン３ａ，４ａを有している。
【００２５】
そして、ピストン３ａ，４ａによりシリンダ３ｂ，４ｂは、停止部屋３ｃ，４ｃ、運転部屋３ｄ，４ｄにそれぞれ区画されて、一方の部屋に圧油又は鉄管水が供給されることによりピストン３ａ，４ａが他方の部屋に向って移動するようになっている。
【００２６】
このような構成で、水車又はポンプ水車への給水開始及び停止は従来と同様に行われる。即ち、調速機等の制御装置からの運転指令により電磁弁２が動作して開方向に切換わる。
【００２７】
これにより、圧油タンク１からの圧油は、逆止弁７を介して配圧弁３の運転部屋３ｄに供給されるようになり、ピストン３ａが停止部屋３ｃ側に移動して、鉄管水の流路を実線矢印の方向から点線矢印の方向に切変える。
【００２８】
このとき、圧油配管１０に分岐して設置されたアキュームレータ６にも圧油タンク１からの圧油が供給されて、当該アキュームレータ６に圧油が貯留されるようになる。
【００２９】
このアキュームレータ６の容量としては、ピストン部１３の部屋の容量を勘案して、例えばシリンダー３ｂの容量の１〜１０倍程度が好ましい。
【００３０】
鉄管水が実線矢印の方向から点線矢印の方向に切変ることにより、当該鉄管水はサーボモータ４の運転部屋４ｄに供給されるようになって、ピストン４ａを停止部屋４ｃ側に移動させる。
【００３１】
これにより、当該ピストン４ａに連結されたロッド４ｅが止水弁５のクランク５ｂを駆動して、弁５ａが止水弁座５ｃから離れて水車又はポンプ水車に給水が開始される。
【００３２】
このような運転状態において圧油タンク１の圧力が何らかの原因で喪失し、調速機等の制御装置から運転停止指令が電磁弁２に出力された場合を考える。
【００３３】
制御装置からの運転停止指令により電磁弁２は、圧油の流路を点線矢印から実線矢印に切替える。
【００３４】
この場合、従来の構成では圧油タンク１の圧力が喪失しているためピストン３ａが動作しないので、サーボモータ４も動作せず、止水弁５は開いた状態のままとなっている。
【００３５】
しかし、本発明に係る構成では、圧油タンク１の圧力が喪失してもアキュームレータ６に圧油が貯留され、かつ、当該アキュームレータ６の圧力が圧油タンク１側に抜けないように逆止弁７が設けられているので、電磁弁２が圧油の流路を切替えると、アキュームレータ６からの圧油が停止部屋３ｃに流入してピストン３ａを運転部屋３ｄ側に移動させる。
【００３６】
これにより、鉄管水の流動方向が点線矢印から実線矢印に切替えるようになり、サーボモータ４のピストン４ａも運転部屋４ｄ側に移動して、弁５ａが止水弁座５ｃに当接し水車又はポンプ水車への給水が停止するようになる。
【００３７】
従って、圧油タンク１の油圧が瞬時に喪失した場合であっても、確実に止水弁５が閉弁操作できるようになり、水車又はポンプ水車を安全、かつ、確実に停止させることが可能になる。
【００３８】
なお上記説明では、アキュームレータ６の圧力が圧油タンク１側に抜けないように逆止弁７を用いて、これを規制する場合について説明したが、本発明はこれに限定されるものではなく、例えば図２に示すように圧力スイッチ９及び閉止用電磁弁８を設けて当該機能を得るようにしても良い。
【００３９】
この圧力スイッチ９は、圧油タンク１の圧力が所定圧以下になったときに、その旨の信号を出力するように設けられており、当該圧力スイッチ９からの信号により閉止用電磁弁８がアキュームレータ６と圧油タンク１との間の給油ライン２１を遮断（閉じる）ようになっている。
【００４０】
従って、圧油タンク１の油圧が瞬時に喪失した場合であっても、圧力スイッチ９がこれを検出して閉止用電磁弁８が給油ライン２１を遮断するので、アキュームレータ６の圧力が保持でき、確実に止水弁５の閉弁操作できるようになって水車又はポンプ水車を安全、かつ、確実に停止させることが可能となる。
【００４１】
また、上記説明では逆止弁７や閉止用電磁弁８等の逆流防止器を１個設けた場合を例に説明したが、例えば逆止弁７が開状態でスティックしてしまったり、閉止用電磁弁８が開状態で焼付いてしまったりすることが考えられ、かかる場合には上述した機能を得ることができなくなる。
【００４２】
このような事態に対応できるようにするために、複数の逆流防止器を設けることが好ましい。その例として、図３に逆止弁７を２個の設けた場合を示す。
【００４３】
同図からも理解できるように、逆流防止器は直列に接続されるようにすることが必要であることは言うまでもない。
【００４４】
次に、本発明の第２の実施の形態を図を参照して説明する。なお、上述した実施の形態と同一構成に関しては同一符号を用いて説明を適宜省略する。
【００４５】
先の実施の形態においては、圧油タンク１の油圧が瞬時に喪失した場合に備えアキュームレータ６に圧油を貯留するようにした。
【００４６】
これに対し、本実施の形態では、圧油タンク１の油圧が瞬時に喪失した場合に、配圧弁３のピストンを止水弁が閉鎖する方向に強制的に移動させる補助装置を設けたものであり、図４に示すように本実施の形態では当該補助装置を水車又はポンプ水車に供給される圧力水である鉄管水の圧力により駆動する補助ピストン部１０としたものである。
【００４７】
このため配圧弁３には、鉄管水により動作する補助ピストン部１０が新たに設けられている。当該補助ピストン部１０は、配圧弁３のピストン部１３と同様の構成で、ピストン１０ａによりシリンダ１０ｂが、停止部屋１０ｃと運転部屋１０ｄとに区画されている。
【００４８】
なお、図４において番号２４は補助ピストン部１０から鉄管水が漏水した場合に、これを排水する配管である。
【００４９】
そして、ピストン部１３と補助ピストン部１０とは連結されて、互いに弁部１４を駆動するようになっている。
【００５０】
但し、補助ピストン部１０の停止部屋１０ｃには、鉄管水が常時供給され、運転部屋１０ｄには当該鉄管水は供給されることがない。
【００５１】
鉄管水が停止部屋１０ｃに供給されることにより、ピストン１０ａは運転部屋１０ｄに力を受けて弁部１４を駆動しようとするが、この駆動力はピストン部１３が弁部１４を駆動する力より適宜小さな値となるように設定されている。
【００５２】
従って、弁部１４は通常時にはピストン部１３により駆動され、圧油タンク１の圧力が喪失したような異常時には、当該ピストン部１３による駆動力が無くなるため、弁部１４は補助ピストン部１０により駆動されるようになって、止水弁５は水車又はポンプ水車への給水を停止させることが可能となる。
【００５３】
なお、上記説明では、補助ピストン部１０の駆動源として鉄管水を用いる場合について説明したが、本発明はこれに限定されるものではなく、図５に示すように、空気タンク１２に蓄圧さた圧縮空気を停止部屋１０ｃに供給するようにしても良い。
【００５４】
この場合、空気タンク１２に圧縮空気を蓄圧するために空気圧縮機が用いられて、常に当該空気タンク１２に所定圧の圧縮空気が蓄えられるようになっている。
【００５５】
これにより、圧油タンク１の圧力が喪失したような異常時には、圧縮空気を駆動源とする補助ピストン部１０が弁部１４を駆動して止水弁５は水車又はポンプ水車への給水を停止することが可能となる。
【００５６】
また、図６に示すように、補助装置として停止部屋１０ｃに弾性部材としてスプリング１５を縮めた状態で収納して、常時ピストン１０ａを運転部屋１０ｄ側に付勢するようにしても良い。
【００５７】
これにより圧油タンク１の圧力が喪失したような異常時には、スプリング１５を駆動源とする補助ピストン部１０が弁部１４を駆動して止水弁５は水車又はポンプ水車への給水を停止することが可能となる。
【００５８】
なお、弾性部材はスプリングに限らず、圧縮バネ、皿バネ、引っ張りバネのいずれでも適用可能であることを敢て付言する。
【００５９】
また、本発明は、鉄管水を作動流体として駆動されるサーボモータ４を有する止水弁開閉装置に限定されるものではなく、圧油を作動流体として駆動されるサーボモータ４を用いた止水弁制御装置でもかまわない。
【００６０】
【発明の効果】
以上説明したように、本発明によれば、何らかの理由で油圧が瞬時に喪失した場合であっても、確実に止水弁を閉弁操作できるようにしたので、水車又はポンプ水車などの水力機械を安全、かつ、確実に停止できる。
【００６１】
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の説明に適用されるアキュムレータ及び逆止弁を備えた水力機械の止水弁開閉装置の構成図である。
【図２】図１に代る構成図で、アキュムレータ及び閉止用電磁弁を備えた水力機械の止水弁開閉装置の構成図である。
【図３】図１に代る構成図で、アキュムレータ及び複数の逆止弁を備えた水力機械の止水弁開閉装置の構成図である。
【図４】本発明の第２の実施の形態の説明に適用される鉄管水を駆動源とする補助ピストン部を備えた水力機械の止水弁開閉装置の構成図である。
【図５】図４に代る構成図で、圧縮空気を駆動源とする補助ピストン部を備えた水力機械の止水弁開閉装置の構成図である。
【図６】図４に代る構成図で、弾性部材を駆動源とする補助ピストン部を備えた水力機械の止水弁開閉装置の構成図である。
【図７】従来の技術の説明に適用される水力機械の止水弁開閉装置の構成図である。
【符号の説明】
１ 圧油タンク
２ 電磁弁
３ 配圧弁
４ サーボモータ
５ 止水弁
６ アキュームレータ
７ 逆止弁
８ 閉止用電磁弁
９ 圧力スイッチ
１０ 補助ピストン部
１２ 空気タンク
１３ ピストン部
１４ 弁部
１５ スプリング[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a water shutoff valve opening / closing device that controls water shutoff of water supplied to a hydraulic machine such as a water wheel or a pump water wheel.
[0002]
[Prior art]
As shown in Patent Literature 1, in a pump turbine in a hydroelectric power plant, a water pressure control type water shutoff valve opening / closing device as shown in FIG. 7 is used (see FIG. 1 of Patent Literature 1).
[0003]
The water shutoff valve opening / closing device includes a pressure oil tank 1 for storing pressure oil, a solenoid valve 2 for switching a flow path of the pressure oil supplied from the pressure oil tank 1, and an iron pipe water (pressure water) driven by the pressure oil. And a servomotor 4 driven by using iron pipe water as a working fluid, so that pressure oil and iron pipe water flow through an oil supply line 21 and a water supply line 22.
[0004]
The pressure distribution valve 3 includes a piston portion 13 and a valve portion 14, and the piston portion 13 and the servomotor 4 of the pressure distribution valve 3 have pistons 3a and 4a, respectively.
[0005]
The cylinders 3b, 4b are partitioned into two chambers 3c, 3d, 4c, 4d by the pistons 3a, 4a, respectively. When one of the chambers is supplied with pressurized oil or iron pipe water, the pistons 3a, 4a are separated from each other. It is designed to move toward the room.
[0006]
Hereinafter, for convenience of explanation, the rooms 3c and 4c are described as stop rooms 3c and 4c, and the rooms 3d and 4d are described as operating rooms 3d and 4d.
[0007]
In FIG. 7, the flow directions of the pressure oil and the iron pipe water when closing the water stop valve 5 are indicated by solid arrows, and the flow directions of the pressure oil and the iron pipe water when the water stop valve 5 is opened are indicated by dotted arrows. Indicated by. Therefore, FIG. 7 shows a state when the water stop valve 5 is closed.
[0008]
With such a configuration, the solenoid valve 2 operates and switches to the opening direction according to an operation command from a control device such as a governor (not shown).
[0009]
As a result, the pressure oil from the pressure oil tank 1 is supplied to the operation room 3d of the pressure distribution valve 3, the piston 3a moves to the stop room 3c side, and the valve unit 14 moves the iron pipe water flow path. Switch from the solid arrow direction to the dotted arrow direction. The pressurized oil stored in the stop room 3c is drained from the drain line 23.
[0010]
By changing the flow path of the iron pipe water, the iron pipe water is supplied to the operation room 4d of the servomotor 4, and the piston 4a moves to the stop room 4c side.
[0011]
As a result, the rod 4e connected to the piston 4a drives the crank 5b of the water stop valve 5, and separates the valve 5a from the water stop valve seat 5c to supply water to the water wheel or the pump water wheel.
[0012]
On the other hand, when the water supply is stopped from the state in which such water supply is being performed, a stop command from a control device such as a governor is output to the electromagnetic valve 2, and the above-described flow of the pressure oil and the iron pipe water is performed. The direction is reversed and the water supply is stopped.
[0013]
[Patent Document 1]
JP-A-55-36629.
[Problems to be solved by the invention]
However, since the above configuration is based on the premise that at least the inside of the pressurized oil tank 1 is maintained at a predetermined pressure, there is a problem that if the pressure in the pressurized oil tank 1 is insufficient, the device does not operate normally.
[0015]
For example, let us consider a case where a crack occurs in the pressure oil tank 1 and the pressure is lost almost instantaneously, whereby a stop command from the control device is output to the solenoid valve 2.
[0016]
In this case, the solenoid valve 2 switches the flow path of the pressure oil in accordance with the stop command, but the pressure oil whose pressure has decreased cannot move the piston 3a, so that the flow path of the iron pipe water does not change. Therefore, since the servomotor 4 is not driven, the water stop valve 5 does not operate and the water supply to the water wheel or the pump water wheel cannot be stopped.
[0017]
Therefore, the present invention provides a safe and reliable stop of a water turbine or a pump turbine by enabling the shutoff valve to be reliably closed even when the oil pressure of the pressure oil tank is instantaneously lost. It is an object of the present invention to provide a water shutoff valve opening and closing device for a hydraulic machine.
[0018]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 is a servo motor that operates a piston by hydraulic pressure of a working fluid to open and close a water stop valve, and a supply path of the working fluid to the servo motor that is driven by hydraulic pressure. A pressure distribution valve for switching the pressure distribution valve, a solenoid valve for switching a flow path of pressure oil for generating pressure oil for generating a hydraulic pressure for driving the pressure distribution valve, and a pressure oil tank for supplying pressure oil to the pressure distribution valve via the solenoid valve. In the hydraulic shut-off valve opening and closing device for a hydraulic machine, a backflow prevention device for preventing pressure oil from flowing back into the pressure oil tank is provided in the middle of a pressure oil pipe connecting the pressure oil tank and the solenoid valve. An accumulator for storing the pressurized oil from the oil tank is provided by branching off from a pressurized oil pipe between the backflow preventer and the solenoid valve.
[0019]
According to a second aspect of the present invention, in the water shutoff valve opening / closing device for a hydraulic machine according to the first aspect, a pressure detection switch for detecting the pressure in the pressure oil tank is further provided, and the backflow prevention device is operated by the pressure detection switch. The electromagnetic valve is configured to close the flow path when the pressure in the pressure oil tank becomes equal to or less than a predetermined value.
[0020]
The invention according to claim 3 is a servo motor that opens and closes a water shutoff valve by operating a piston by the hydraulic pressure of a working fluid, a pressure distribution valve that is driven by hydraulic pressure to switch a supply path of the working fluid to the servo motor, In a water shutoff valve opening / closing device of a hydraulic machine having an electromagnetic valve that switches a flow path of pressure oil that generates a hydraulic pressure that drives a pressure distribution valve, and a pressure oil tank that supplies pressure oil to the pressure distribution valve via the electromagnetic valve,
An auxiliary device is provided that constantly biases the pressure distribution valve in a direction in which the pressure distribution valve is switched to a supply path of the working fluid in a direction in which the water shutoff valve is closed, and with a smaller force than the hydraulic pressure driving the pressure distribution valve. Features.
[0021]
According to a fourth aspect of the present invention, in the water shutoff valve opening / closing device for the hydraulic machine according to the third aspect, the auxiliary device is an auxiliary piston driven by the pressure of the pressure water supplied to the hydraulic machine. I do.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to the drawings. In addition, about the same structure as a conventional, the same code | symbol is attached and description is abbreviate | omitted suitably.
[0023]
FIG. 1 is a diagram showing a configuration of a water shutoff valve opening / closing device of a hydraulic machine according to the present embodiment, in which a pressure oil tank 1 for storing pressure oil and a flow path of pressure oil supplied from the pressure oil tank 1 are shown. Electromagnetic valve 2 for switching, pressure distribution valve 3 for switching the flow path of iron pipe water driven by pressure oil, servomotor 4 driven by iron pipe water, pressure oil pipe 10 connecting pressure oil tank 1 and solenoid valve 2 An accumulator 6 which is a pressure accumulator for storing the pressure oil from the pressure oil tank 1, and a backflow preventing device for preventing the pressure oil stored in the accumulator 6 from flowing back into the pressure oil tank 1. It has a check valve 7.
[0024]
The pressure distribution valve 3 includes a piston portion 13 and a valve portion 14, and the piston portion 13 and the servomotor 4 of the pressure distribution valve 3 have pistons 3a and 4a, respectively.
[0025]
The cylinders 3b, 4b are partitioned into the stop rooms 3c, 4c and the operation rooms 3d, 4d by the pistons 3a, 4a, respectively. It moves to the other room.
[0026]
With such a configuration, the start and stop of water supply to the turbine or the pump turbine are performed in the same manner as in the related art. That is, the solenoid valve 2 operates according to an operation command from a control device such as a governor to switch to the opening direction.
[0027]
Thereby, the pressure oil from the pressure oil tank 1 is supplied to the operation room 3d of the pressure distribution valve 3 via the check valve 7, and the piston 3a moves to the stop room 3c side, and the iron pipe water is discharged. The flow path is switched from the direction of the solid arrow to the direction of the dotted arrow.
[0028]
At this time, the pressurized oil from the pressurized oil tank 1 is also supplied to the accumulator 6 branched and installed in the pressurized oil pipe 10 so that the pressurized oil is stored in the accumulator 6.
[0029]
The capacity of the accumulator 6 is preferably, for example, about 1 to 10 times the capacity of the cylinder 3b in consideration of the capacity of the room of the piston portion 13.
[0030]
When the iron pipe water changes from the direction of the solid line arrow to the direction of the dotted arrow, the iron pipe water is supplied to the operation room 4d of the servo motor 4, and moves the piston 4a to the stop room 4c side.
[0031]
Thereby, the rod 4e connected to the piston 4a drives the crank 5b of the water stop valve 5, the valve 5a is separated from the water stop valve seat 5c, and water supply to the water turbine or the pump water turbine is started.
[0032]
It is assumed that in such an operating state, the pressure in the pressure oil tank 1 is lost for some reason and an operation stop command is output to the solenoid valve 2 from a control device such as a governor.
[0033]
In response to an operation stop command from the control device, the solenoid valve 2 switches the flow path of the pressure oil from a dotted arrow to a solid arrow.
[0034]
In this case, in the conventional configuration, since the pressure in the pressure oil tank 1 has been lost, the piston 3a does not operate, so that the servomotor 4 does not operate, and the water stop valve 5 remains open.
[0035]
However, in the configuration according to the present invention, even if the pressure in the pressurized oil tank 1 is lost, the check oil is stored in the accumulator 6 and the check valve is configured to prevent the pressure of the accumulator 6 from leaking to the pressurized oil tank 1 side. When the solenoid valve 2 switches the flow path of the pressure oil, the pressure oil from the accumulator 6 flows into the stop room 3c to move the piston 3a to the operation room 3d side.
[0036]
As a result, the flow direction of the iron pipe water is switched from the dotted arrow to the solid arrow, the piston 4a of the servomotor 4 also moves to the operation room 4d side, and the valve 5a comes into contact with the water stop valve seat 5c and the water wheel or the pump is driven. The water supply to the turbine will stop.
[0037]
Therefore, even when the oil pressure in the pressurized oil tank 1 is instantaneously lost, the water shutoff valve 5 can be reliably closed, and the turbine or the pump turbine can be stopped safely and reliably. become.
[0038]
In the above description, the case where the pressure of the accumulator 6 is regulated by using the check valve 7 so as not to escape to the pressure oil tank 1 side has been described. However, the present invention is not limited to this. For example, as shown in FIG. 2, a pressure switch 9 and a closing solenoid valve 8 may be provided to obtain the function.
[0039]
The pressure switch 9 is provided so as to output a signal to that effect when the pressure of the pressure oil tank 1 becomes equal to or lower than a predetermined pressure, and the closing solenoid valve 8 is actuated by a signal from the pressure switch 9. The oil supply line 21 between the accumulator 6 and the pressure oil tank 1 is shut off (closed).
[0040]
Therefore, even when the oil pressure in the pressurized oil tank 1 is instantaneously lost, the pressure switch 9 detects the oil pressure and the closing solenoid valve 8 shuts off the oil supply line 21, so that the pressure of the accumulator 6 can be maintained. The water shutoff valve 5 can be reliably closed, and the water wheel or the pump water wheel can be stopped safely and reliably.
[0041]
In the above description, the case where one check valve such as the check valve 7 or the closing solenoid valve 8 is provided is described as an example. However, for example, the check valve 7 sticks in the open state, or the check valve 7 closes. It is possible that the solenoid valve 8 is seized in the open state, and in such a case, the above-described function cannot be obtained.
[0042]
In order to cope with such a situation, it is preferable to provide a plurality of backflow preventers. As an example, FIG. 3 shows a case where two check valves 7 are provided.
[0043]
As can be understood from the figure, it is needless to say that the backflow prevention devices need to be connected in series.
[0044]
Next, a second embodiment of the present invention will be described with reference to the drawings. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
[0045]
In the above embodiment, the pressurized oil is stored in the accumulator 6 in case the oil pressure in the pressurized oil tank 1 is instantaneously lost.
[0046]
On the other hand, in the present embodiment, when the oil pressure in the pressure oil tank 1 is instantaneously lost, an auxiliary device is provided for forcibly moving the piston of the pressure distribution valve 3 in the direction in which the water stop valve closes. In addition, as shown in FIG. 4, in this embodiment, the auxiliary device is an auxiliary piston unit 10 driven by the pressure of iron pipe water which is pressure water supplied to a water turbine or a pump water turbine.
[0047]
For this reason, the pressure distribution valve 3 is newly provided with an auxiliary piston portion 10 operated by iron pipe water. The auxiliary piston section 10 has the same configuration as the piston section 13 of the pressure distribution valve 3, and the piston 10a divides the cylinder 10b into a stop room 10c and an operation room 10d.
[0048]
In FIG. 4, reference numeral 24 denotes a pipe for draining iron pipe water when it leaks from the auxiliary piston portion 10.
[0049]
And the piston part 13 and the auxiliary piston part 10 are connected and drive the valve part 14 mutually.
[0050]
However, iron pipe water is always supplied to the stop room 10c of the auxiliary piston unit 10, and the iron pipe water is not supplied to the operation room 10d.
[0051]
When the iron pipe water is supplied to the stop room 10c, the piston 10a tries to drive the valve unit 14 by receiving a force in the operation room 10d, but this driving force is greater than the force by which the piston unit 13 drives the valve unit 14. It is set to be a small value as appropriate.
[0052]
Therefore, the valve portion 14 is normally driven by the piston portion 13, and in the event of an abnormality such as a loss of pressure in the pressure oil tank 1, the driving force of the piston portion 13 is lost, so that the valve portion 14 is driven by the auxiliary piston portion 10. Thus, the water stop valve 5 can stop supplying water to the water turbine or the pump water turbine.
[0053]
In the above description, the case where iron pipe water is used as the driving source of the auxiliary piston unit 10 has been described. However, the present invention is not limited to this, and the pressure is stored in the air tank 12 as shown in FIG. Compressed air may be supplied to the stop room 10c.
[0054]
In this case, an air compressor is used to accumulate the compressed air in the air tank 12, so that the compressed air of a predetermined pressure is always stored in the air tank 12.
[0055]
Thus, in the event of an abnormality such as a loss of pressure in the pressurized oil tank 1, the auxiliary piston unit 10 driven by compressed air drives the valve unit 14 and the water stop valve 5 stops supplying water to the water turbine or the pump water turbine. It is possible to do.
[0056]
Further, as shown in FIG. 6, a spring 15 may be housed in the stop room 10c as an elastic member in a contracted state as an auxiliary device, and the piston 10a may be constantly biased toward the operation room 10d.
[0057]
As a result, in the event of an abnormality such as a loss of pressure in the pressure oil tank 1, the auxiliary piston unit 10 driven by the spring 15 drives the valve unit 14 and the water stop valve 5 stops supplying water to the water turbine or the pump turbine. It becomes possible.
[0058]
It should be noted that the elastic member is not limited to a spring, but may be any of a compression spring, a disc spring, and a tension spring.
[0059]
Further, the present invention is not limited to the water shutoff valve opening / closing device having the servomotor 4 driven by the iron pipe water as the working fluid, but the water stoppage using the servomotor 4 driven by the pressure oil as the working fluid. A valve control device may be used.
[0060]
【The invention's effect】
As described above, according to the present invention, even when oil pressure is instantaneously lost for some reason, the water shutoff valve can be reliably closed, so that a hydraulic machine such as a water wheel or a pump water wheel can be used. Can be stopped safely and reliably.
[0061]
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a water shutoff valve opening / closing device of a hydraulic machine including an accumulator and a check valve applied to the description of a first embodiment of the present invention.
FIG. 2 is a configuration diagram instead of FIG. 1, and is a configuration diagram of a water stop valve opening / closing device of a hydraulic machine including an accumulator and a solenoid valve for closing.
FIG. 3 is a block diagram instead of FIG. 1 and is a block diagram of a water shutoff valve opening / closing device of a hydraulic machine including an accumulator and a plurality of check valves.
FIG. 4 is a configuration diagram of a water shutoff valve opening / closing device of a hydraulic machine having an auxiliary piston unit driven by iron pipe water, which is applied to the description of a second embodiment of the present invention.
FIG. 5 is a configuration diagram instead of FIG. 4, and is a configuration diagram of a water shutoff valve opening / closing device of a hydraulic machine having an auxiliary piston unit driven by compressed air.
FIG. 6 is a configuration diagram instead of FIG. 4, and is a configuration diagram of a water shutoff valve opening / closing device of a hydraulic machine having an auxiliary piston unit using an elastic member as a driving source.
FIG. 7 is a configuration diagram of a water shutoff valve opening / closing device of a hydraulic machine applied to the description of the related art.
[Explanation of symbols]
Reference Signs List 1 pressure oil tank 2 solenoid valve 3 pressure distribution valve 4 servomotor 5 water stop valve 6 accumulator 7 check valve 8 closing solenoid valve 9 pressure switch 10 auxiliary piston unit 12 air tank 13 piston unit 14 valve unit 15 spring

Claims (4)

作動流体の液圧によってピストンを作動して止水弁を開閉させるサーボモータと、油圧により駆動されて前記サーボモータへの前記作動流体の供給経路を切り替える配圧弁と、該配圧弁を駆動する油圧を生じさせる圧油を生じさせる圧油の流路を切り替える電磁弁と、該電磁弁を介して配圧弁に圧油を供給する圧油タンクとを有する水力機械の止水弁開閉装置において、
前記圧油タンクと前記電磁弁とを連結する圧油配管の途中に、圧油が前記圧油タンクに逆流することを防ぐ逆流防止器を設けるとともに、該圧油タンクからの圧油を貯留するアキュムレータをこの逆流防止器と前記電磁弁との間の圧油配管から分岐して設けることを特徴とする水力機械の止水弁開閉装置。A servomotor that operates a piston by the hydraulic pressure of the working fluid to open and close a water shutoff valve, a pressure distribution valve that is driven by hydraulic pressure to switch the supply path of the working fluid to the servomotor, and a hydraulic pressure that drives the pressure distribution valve An electromagnetic valve for switching a flow path of pressure oil for generating pressure oil, and a water shutoff valve opening / closing device for a hydraulic machine having a pressure oil tank for supplying pressure oil to a pressure distribution valve via the electromagnetic valve.
In the middle of a pressure oil pipe connecting the pressure oil tank and the solenoid valve, a backflow prevention device for preventing the pressure oil from flowing back into the pressure oil tank is provided, and the pressure oil from the pressure oil tank is stored. A water shutoff valve opening / closing device for a hydraulic machine, wherein an accumulator is provided branching from a pressure oil pipe between the backflow prevention device and the solenoid valve. 請求項１に記載の水力機械の止水弁開閉装置において、さらに圧油タンク内の圧力を検出する圧力検出スイッチを設け、前記逆流防止器を該圧力検出スイッチにて圧油タンク内の圧力が予め定められた値以下となったときに流路を閉止する電磁弁としたことを特徴とする水力機械の止水弁開閉装置。The water shutoff valve opening / closing device for a hydraulic machine according to claim 1, further comprising a pressure detection switch for detecting a pressure in the pressure oil tank, wherein the pressure in the pressure oil tank is reduced by the backflow prevention device. A water shutoff valve opening / closing device for a hydraulic machine, wherein the solenoid valve is configured to close a flow passage when a flow rate falls below a predetermined value. 作動流体の液圧によってピストンを作動して止水弁を開閉させるサーボモータと、油圧により駆動されて前記サーボモータへの前記作動流体の供給経路を切り替える配圧弁と、該配圧弁を駆動する油圧を生じさせる圧油の流路を切り替える電磁弁と、該電磁弁を介して前記配圧弁に圧油を供給する圧油タンクとを有する水力機械の止水弁開閉装置において、
前記配圧弁を前記止水弁が閉鎖する方向の前記作動流体の供給経路に切り替える方向で、かつ前記配圧弁を駆動する油圧による力より小さい力で、当該配圧弁を常時付勢する補助装置を設けたことを特徴とする水力機械の止水弁開閉装置。A servomotor that operates a piston by the hydraulic pressure of the working fluid to open and close a water shutoff valve, a pressure distribution valve that is driven by hydraulic pressure to switch the supply path of the working fluid to the servomotor, and a hydraulic pressure that drives the pressure distribution valve A solenoid valve for switching the flow path of the pressure oil causing the pressure, and a hydraulic oil shutoff valve opening and closing device having a pressure oil tank for supplying pressure oil to the pressure distribution valve via the electromagnetic valve,
An auxiliary device that constantly urges the pressure distribution valve in a direction in which the pressure distribution valve is switched to a supply path of the working fluid in a direction in which the water shutoff valve is closed, and with a smaller force than a hydraulic pressure driving the pressure distribution valve. A water shutoff valve opening / closing device for a hydraulic machine, which is provided. 請求項３に記載の水力機械の止水弁開閉装置において、補助装置は、水力機械に供給される圧力水の圧力によって駆動される補助ピストンであることを特徴とする水力機械の止水弁開閉装置。The water shutoff valve opening / closing device for a hydraulic machine according to claim 3, wherein the auxiliary device is an auxiliary piston driven by the pressure of the pressure water supplied to the hydraulic machine. apparatus.
JP2003013221A 2003-01-22 2003-01-22 Water stop valve opening and closing device for hydraulic machinery Withdrawn JP2004225589A (en)

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CN111043096A (en) * 2020-01-06 2020-04-21 华自科技股份有限公司 Water turbine speed regulating system and built-in self-resetting double-end regulating main pressure distributing valve set thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111043096A (en) * 2020-01-06 2020-04-21 华自科技股份有限公司 Water turbine speed regulating system and built-in self-resetting double-end regulating main pressure distributing valve set thereof

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