JP3876230B2 - Fire control fluid pressure control valve - Google Patents

Fire control fluid pressure control valve Download PDF

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Publication number
JP3876230B2
JP3876230B2 JP2003057246A JP2003057246A JP3876230B2 JP 3876230 B2 JP3876230 B2 JP 3876230B2 JP 2003057246 A JP2003057246 A JP 2003057246A JP 2003057246 A JP2003057246 A JP 2003057246A JP 3876230 B2 JP3876230 B2 JP 3876230B2
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Prior art keywords
fluid
fire
pressure
valve
piston
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JP2003057246A
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JP2004261509A (en
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昌彦 山本
将生 小西
定夫 宇野
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Youtec Co Ltd
J Morita Corp
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Youtec Co Ltd
J Morita Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、消防自動車等に搭載したポンプに消火栓や他の消防自動車等から供給される消火用流体の圧力を調節するための圧力制御弁に関する。
【0002】
【従来の技術】
消火用流体吐出ポンプに供給される消火用流体の圧力が過大であったり急激に変動すると、その圧力の作用を受ける機器が破損したり、放水銃を持つ消防隊員に作用する力が急変したり、消火対象に正確に放水できないといったおそれがある。
【0003】
そのような問題に対処するため、消火用流体吐出ポンプに供給される消火用流体の圧力制御弁が提案されている(特許文献1)。その圧力制御弁は、消火用流体供給源に接続される流体入口と消火用流体吐出ポンプに接続される流体出口を有するバルブボディと、そのバルブボディに往復移動可能に挿入されるピストンバルブと、その流体入口と流体出口との間においてピストンバルブの移動に応じて流路面積が変化する流体通路と、そのバルブボディの内周とピストンバルブの外周との間にピストンバルブの移動に応じて容積変化するように形成される環状空間と、その環状空間にピストンバルブの移動に伴い弾性変形するように配置されるバネとを備える。そのピストンバルブは、流体入口側における消火用流体の圧力を受ける第1受圧面と、流体出口側における消火用流体の圧力を受ける第2受圧面とを有し、その第2受圧面の面積は第1受圧面の面積よりも大きくされる。そのバネにより、そのピストンバルブを前記流路面積の増大方向に向かわせる弾力が作用される。その流体出口における消火用流体の圧力は、ピストンバルブの前記流路面積の減少方向に向かう移動により低減され、前記流路面積の増大方向に向かう移動により増大される。これにより、消火用流体供給源から供給される消火用流体の圧力が過大であったり急激に変動した場合に、バルブボディの流体出口から流出する消火用流体の圧力を適正範囲に維持することが図られている。
【0004】
【特許文献1】
実登第2521223号
【0005】
【発明が解決しようとする課題】
上記従来の圧力制御弁においては、ピストンバルブの移動に伴うバネの弾性変形が、バルブボディとピストンバルブとの間の摩擦、バネとバルブボディの内周との間の摩擦、バネとピストンバルブの外周との間の摩擦により阻害され、それにより消火用流体の圧力の適正な制御が阻害されるという問題がある。その問題は、バネ、バルブボディ、ピストンバルブの汚れや錆等によって助長される。
【0006】
さらに、上記従来の圧力制御弁においては、バルブボディの内部における流体通路の構成部材の位置を可変とすることで、消火用流体の流体出口における圧力を調節している。しかし、バルブボディは消火用流体の配管設備に組み込まれることから、そのような微調節のための作業は面倒なものであった。
【0007】
本発明は、上記問題を解決することのできる消火用流体の圧力制御弁を提供することを目的とする。
【0008】
【課題を解決するための手段】
本発明は、消火用流体供給源に接続される流体入口と消火用流体吐出ポンプに接続される流体出口とを有するバルブボディと、前記バルブボディに往復移動可能に挿入されるピストンバルブと、前記流体入口と前記流体出口との間において前記ピストンバルブの移動に応じて流路面積が変化する流体通路と、前記バルブボディの内周と前記ピストンバルブの外周との間に、前記ピストンバルブの移動に応じて容積変化するように形成された環状空間と、前記環状空間に前記ピストンバルブの移動に伴い弾性変形するように配置されるバネとを備え、前記ピストンバルブは、前記流体入口側における消火用流体の圧力を受ける第1受圧面と、前記流体出口側における消火用流体の圧力を受ける第2受圧面とを有し、前記第2受圧面の面積は前記第1受圧面の面積よりも大きくされ、前記バネにより、前記ピストンバルブを前記流路面積の増大方向に向かわせる弾力が作用され、前記流体出口における消火用流体の圧力は、前記ピストンバルブの前記流路面積の減少方向に向かう移動により低減され、前記流路面積の増大方向に向かう移動により増大される圧力制御弁において、前記環状空間に通じるオイル貯留空間を有するオイルタンクが設けられ、前記オイル貯留空間に導入され貯留されるオイルが前記環状空間にまで充填されることを特徴とする。
本発明によれば、環状空間に充填されるオイルにより、バルブボディとピストンバルブとの間の摩擦、バネとバルブボディの内周との間の摩擦、バネとピストンバルブの外周との間の摩擦を低減し、また、バネ、バルブボディ、ピストンバルブの汚れや錆等を防止できる。これにより、ピストンバルブの移動に伴うバネの弾性変形が阻害されるのを防止し、消火用流体の圧力の適正な制御ができる。
【0009】
前記オイル貯留空間に貯留されるオイルの液面は前記環状空間の上方に位置されるのが好ましい。これにより、環状空間の容積がピストンバルブの移動により変動しても、常に環状空間を確実にオイルにより満たすことができる。
【0010】
前記環状空間の容積は、前記ピストンバルブの前記流路面積の減少方向に向かう移動により低減され、前記流路面積の増大方向に向かう移動により増大され、前記オイルタンク内にピストンが前記環状空間の容積変化に応じて往復移動可能に挿入され、前記ピストンにより前記オイル貯留空間に貯留されるオイルを前記環状空間に向かい押し出すように、前記ピストンに弾力を付与する第2バネが設けられているのが好ましい。
これにより、ピストンバルブにバネの弾力だけでなく第2バネの弾力も作用するので、第2バネの弾力に応じてピストンバルブの位置を調節し、消火用流体の流体出口における圧力を調節できる。
【0011】
【発明の実施の形態】
図1、図2に示す消防自動車1は、車輪2により支持される車体3に内蔵される消火用水吐出用ポンプ4を備える。そのポンプ4の吸引側に接続された配管5が、車体3の側面に設けられた開閉コック6と自然給水口7とに接続される。配管5は開閉コック6に消火用流体の圧力制御弁10を介して接続される。開閉コック6により開閉される吸入口6aに、他の消防自動車や消火栓等の消火用流体供給源から送られる有圧(大気圧を超える)の消火用水を搬送するホースが接続される。自然給水口7に消防自動車1の側面に保持される自然給水用給水ホース8の一端が接続される。自然給水用給水ホース8の他端は池や河川等の大気圧の消火用水に漬浸される。ポンプ4から吐出される消火用水は、配管設備(図示省略)を介して他の消防自動車や放水銃等に送り出される。なお、消防自動車は化学薬剤タンクを搭載し、ポンプから吐出される消火用水を化学薬剤と混合し、消火用流体として化学薬剤と水の混合液を送り出すものであってもよい。また、消火流体として化学薬剤と水の混合液が吸入口6aを介してポンプ4に吸引されてもよい。
【0012】
図3に示すように、圧力制御弁10は円筒状のバルブボディ11と、バルブボディ11に同軸状に挿入されると共に軸方向往復移動可能な円筒状のピストンバルブ12とを備える。
【0013】
バルブボディ11は、筒状の第1〜第3部材11a、11b、11cを有し、第1部材11aの一端内周に第2部材11bの一端外周がシールリング11dを介してねじ合わされ、第2部材11bの他端外周がシールリング11eを介して第3部材11cの一端内周にねじ合わされている。第1部材11aにドレン配管接続口11fと吸入側開閉コック6との連結用ボルトがねじ合わされるネジ孔11gが形成され、第3部材11cに配管5との連結用ボルトがねじ合わされるネジ孔11hが形成されている。バルブボディ11の一端は消火用流体供給源に接続される流体入口13とされ、他端はポンプ4に接続される流体出口14とされている。図において矢印で示すように、流体入口13からバルブボディ11に流入した消火用流体は、ピストンバルブ12の内方を通過して流体出口14から流出する。
【0014】
ピストンバルブ12はバルブボディ11にシールリング16a、16bを介して嵌め合わされている。ピストンバルブ12は流体出口14側の端部近傍において外方に向かい張り出すフランジ部12aを有する。
【0015】
ピストンバルブ12における流体入口13側の端面により、流体入口13における消火用流体の圧力を受ける第1受圧面21が構成されている。ピストンバルブ12における流体出口14側の端面12′と、フランジ部12aの流体出口14側の端面12a″とで、流体出口14における消火用流体の圧力を受ける第2受圧面22が構成されている。第2受圧面22の面積は第1受圧面21の面積よりも大きくされている。なお、バルブボディ11を構成する第3部材11cの内周11c′とピストンバルブ12の外周との間には隙間が設けられることで、フランジ部12aの流体出口14側の端面12a″に流体出口14における消火用流体の圧力が作用する。
【0016】
流体入口13と流体出口14との間においてピストンバルブ12の移動に応じて流路面積が変化する流体通路17が形成されている。すなわち、バルブボディ11の内周にナット31が連結プレート32を介して同心状に固定され、そのナット31にねじ合わされるネジシャフト33にコントロール部材34が取り付けられている。コントロール部材34はバルブボディ11と同心の2つの円錐台の大径端同士を接合した形状を有し、第1受圧面21に対向する位置に配置されている。コントロール部材34と第1受圧面21との間が流体通路17とされている。
【0017】
流体出口14における消火用流体の圧力は、ピストンバルブ12の流体入口13に向かう方向の移動により流体通路17の流路面積が減少することで低減され、流体出口14に向かう方向の移動によりその流路面積が増加することで増大される。
【0018】
バルブボディ11の内周とピストンバルブ12の外周との間に油密状の環状空間18が形成されている。バルブボディ11の内周に周溝11iが形成され、ピストンバルブ12の外周と周溝11iの内周と周溝11iの流体入口13側の端面11i′とフランジ部12aの流体入口13側の端面12a′とで囲まれる空間が環状空間18とされている。これにより、ピストンバルブ12の移動に応じて環状空間18の容積が変化する。環状空間18の容積は、ピストンバルブ12の流体入口13に向かう方向の移動、すなわち前記流路面積の減少方向に向かう移動により低減され、流体出口14に向かう方向の移動、すなわち前記流路面積の増大方向に向かう移動により増大される。なお、周溝11iの流体入口13側の端面11i″にフランジ部12aが接することで、ピストンバルブ12の流体出口14側への抜けが防止されている。
【0019】
環状空間18に圧縮コイルバネ19が配置されている。バネ19は周溝11iの流体入口13側の端面11i′とフランジ部12aの流体入口13側の端面12a′とに挟まれる。これにより、バネ19はピストンバルブ12の移動に伴い弾性変形する。また、バネ19により、ピストンバルブ12を前記流路面積の増大方向に向かわせる弾力が作用される。
【0020】
環状空間18に通じるオイル貯留空間50を有するオイルタンク51が設けられている。すなわち、バルブボディ11に環状空間18に通じる接続口11jが設けられ、接続口11jに接続されるフレキシブルチューブ43を介して環状空間18とオイル貯留空間50が連絡される。オイル貯留空間50に導入されるオイルが環状空間18に充填される。
【0021】
図4に示すように、オイルタンク51は、軸心方向を上下方向として消防自動車1に取り付けられる円筒状のシリンダ52と、シリンダ52の上端開口を覆う上部キャップ53と、シリンダ52の下端開口をオイルシールを介して覆う下部キャップ54とを有する。上部キャップ53に空気抜き孔53aが形成され、下部キャップ54に形成された接続口54aにフレキシブルチューブ43が接続される。オイルタンク51にピストン55がオイルシール56を介して同軸状挿入され、シリンダ52の軸方向に往復移動可能とされ、ピストン55とオイルタンク51の内面とで囲まれる空間が油密状のオイル貯留空間50とされている。環状空間18の容積変化に応じてオイル貯留空間50に貯留されるオイル量が変動することで、ピストン55は往復移動する。ピストン55によりオイル貯留空間50に貯留されるオイルを環状空間18に向かい押し出す弾力を付与する第2バネ57が設けられている。第2バネ57は圧縮コイルバネとされ、ピストン55と上部キャップ53とで挟まれることで弾性変形している。第2バネ57の弾力の作用がなくてもオイル貯留空間50に導入されるオイルにより環状空間18が満たされるように、オイル貯留空間50に貯留されるオイルの液面は環状空間18の上方に位置される。
【0022】
上記圧力制御弁10においては、消火用流体供給源から供給される消火用流体の圧力が過大であったり急激に変動しても、第1受圧面21と第2受圧面22とに作用する消火用流体の圧力とバネ19の弾力とがバランスするようにピストンバルブ12が移動することで、流体出口14から流出する消火用流体の圧力を適正範囲に維持することができる。例えば、放水量が1500L/min程度までであれば、消火用流体供給源から供給される消火用流体の圧力が0.2MPa〜1.0MPa程度である場合に、流体出口14から流出する消火用流体の圧力を0.05MPa〜0.35MPa程度に維持でき、また、放水量が2000L/min程度までであれば、消火用流体供給源から供給される消火用流体の圧力が0.2MPa〜1.5MPa程度である場合に、流体出口14から流出する消火用流体の圧力を0.05MPa〜0.55MPa程度に維持できる。なお、ナット31に対するネジシャフト33のねじ込み量を変化させてコントロール部材34を可変とすることで、流体通路17の流路面積を変更し、消火用流体の流体出口14における圧力を調節することが可能とされている。
【0023】
上記圧力制御弁10によれば、環状空間18に充填されるオイルにより、バルブボディ11とピストンバルブ12との間の摩擦、バネ19とバルブボディ11の内周との間の摩擦、バネ19とピストンバルブ12の外周との間の摩擦を低減し、また、バネ19、バルブボディ11、ピストンバルブ12の汚れや錆等を防止できる。これにより、ピストンバルブ12の移動に伴うバネ19の弾性変形が阻害されるのを防止し、消火用流体の圧力の適正な制御ができる。さらに、オイル貯留空間50に貯留されるオイルの液面は環状空間18の上方に位置されるので、環状空間18の容積がピストンバルブ12の移動により変動しても、常に環状空間18をオイルにより満たすことができる。また、ピストンバルブ12にバネ19の弾力だけでなく第2バネ57の弾力も作用するので、第2バネ57の弾力に応じてピストンバルブ12の位置を調節し、消火用流体の流体出口14における圧力を調節できる。例えば、オイル貯留空間50に貯留されるオイル量を変化させることで第2バネ57の弾力を変化させ、消火用流体の流体出口14における圧力を調節できる。
【0024】
本発明は上記実施形態に限定されない。例えば図5の第1変形例に示すように、オイルタンク51の内部において上記実施形態におけるピストン55や第2バネ57をなくし、また、オイル貯留空間50の内圧変動の防止とオイル貯留空間50への塵埃侵入防止のため、互いに並列配置されるチェック弁60a、60bとフィルター60cとで構成される公知のフィルター付ブリーザ60をオイルタンク51に取り付けてもよい。さらに、図6の第2変形例のオイルタンク51においては、上記実施形態におけるピストン55や第2バネ57がなくされ、筒状ねじ部材43′の一端がオイルタンク51に溶接されたナット61にねじ合わされ、その筒状雄ねじ部材43′の他端がバルブボディ11における接続口11jにねじ合わされ、フレキシブルチューブ43に代えてナット61と筒状雄ねじ部材43′の内周孔を介してオイル貯留空間50が環状空間18に通じるものとされ、オイル供給口51cからオイル貯留空間50に導入されるオイルが環状空間18に充填され、そのオイル供給口51cはレベルゲージ付のキャップ(図示省略)をねじ合わせることで閉鎖可能とされている。
【0025】
【発明の効果】
本発明の圧力制御弁によれば、消火用流体の圧力を適正に制御でき、さらに、その圧力の調節作業を容易に行うことができる。
【図面の簡単な説明】
【図1】本発明の実施形態の圧力制御弁の配置説明用側面図
【図2】本発明の実施形態の圧力制御弁の配置説明用平面図
【図3】本発明の実施形態の圧力制御弁の半部破断側面図
【図4】本発明の実施形態の圧力制御弁のオイルタンクの半部破断側面図
【図5】本発明の第1変形例の圧力制御弁のオイルタンクの部分破断側面図
【図6】本発明の第2変形例の圧力制御弁のオイルタンクの部分破断側面図
【符号の説明】
4 消火用流体吐出ポンプ
10 圧力制御弁
11 バルブボディ
12 ピストンバルブ
13 流体入口
14 流体出口
17 流体通路
18 環状空間
19 バネ
21 第1受圧面
22 第2受圧面
50 オイル貯留空間
51 オイルタンク
55 ピストン
57 第2バネ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure control valve for adjusting the pressure of a fire-extinguishing fluid supplied from a fire hydrant or another fire engine to a pump mounted on a fire engine or the like.
[0002]
[Prior art]
If the pressure of the fire-extinguishing fluid supplied to the fire-extinguishing fluid discharge pump is excessive or fluctuates, the equipment affected by the pressure may be damaged, or the force acting on the firefighters with the water discharge gun may suddenly change. There is a risk that water will not be discharged accurately to the fire extinguishing target.
[0003]
In order to cope with such a problem, a pressure control valve for a fire fighting fluid supplied to a fire fighting fluid discharge pump has been proposed (Patent Document 1). The pressure control valve includes a fluid inlet connected to a fire extinguishing fluid supply source, a valve body having a fluid outlet connected to a fire extinguishing fluid discharge pump, and a piston valve inserted into the valve body so as to be reciprocally movable; Between the fluid inlet and the fluid outlet, a fluid passage whose flow path area changes according to the movement of the piston valve, and a volume according to the movement of the piston valve between the inner periphery of the valve body and the outer periphery of the piston valve. An annular space formed so as to change, and a spring disposed in the annular space so as to be elastically deformed as the piston valve moves. The piston valve has a first pressure receiving surface that receives the pressure of the fire-extinguishing fluid on the fluid inlet side, and a second pressure receiving surface that receives the pressure of the fire-extinguishing fluid on the fluid outlet side, and the area of the second pressure receiving surface is It is larger than the area of the first pressure receiving surface. The spring exerts an elastic force that directs the piston valve in the direction of increasing the flow path area. The pressure of the fire extinguishing fluid at the fluid outlet is reduced by the movement of the piston valve toward the decreasing direction of the flow path area, and is increased by the movement of the piston valve toward the increasing direction of the flow path area. As a result, when the pressure of the fire-extinguishing fluid supplied from the fire-extinguishing fluid supply source is excessive or suddenly fluctuates, the pressure of the fire-extinguishing fluid flowing out from the fluid outlet of the valve body can be maintained within an appropriate range. It is illustrated.
[0004]
[Patent Document 1]
JITTO No.2521223 [0005]
[Problems to be solved by the invention]
In the conventional pressure control valve described above, the elastic deformation of the spring accompanying the movement of the piston valve causes friction between the valve body and the piston valve, friction between the spring and the inner periphery of the valve body, and between the spring and the piston valve. There is a problem in that it is hindered by friction with the outer periphery, thereby inhibiting proper control of the pressure of the fire-extinguishing fluid. This problem is promoted by dirt, rust, etc. on the spring, valve body, and piston valve.
[0006]
Furthermore, in the conventional pressure control valve, the pressure at the fluid outlet of the fire-extinguishing fluid is adjusted by changing the position of the constituent member of the fluid passage inside the valve body. However, since the valve body is incorporated in the piping system for the fire extinguishing fluid, the work for such fine adjustment is troublesome.
[0007]
An object of this invention is to provide the pressure control valve of the fire-extinguishing fluid which can solve the said problem.
[0008]
[Means for Solving the Problems]
The present invention includes a valve body having a fluid inlet connected to a fire-extinguishing fluid supply source and a fluid outlet connected to a fire-extinguishing fluid discharge pump, a piston valve inserted into the valve body so as to be reciprocally movable, Movement of the piston valve between a fluid passage in which a flow path area changes according to movement of the piston valve between a fluid inlet and the fluid outlet, and an inner periphery of the valve body and an outer periphery of the piston valve An annular space formed so as to change in volume according to the pressure, and a spring disposed in the annular space so as to be elastically deformed as the piston valve moves, wherein the piston valve is configured to extinguish fire on the fluid inlet side. A first pressure-receiving surface that receives the pressure of the working fluid, and a second pressure-receiving surface that receives the pressure of the fire-extinguishing fluid on the fluid outlet side, and the area of the second pressure-receiving surface is The area of the pressure receiving surface is larger than the area of the pressure receiving surface, and the spring exerts an elastic force that directs the piston valve in the direction of increasing the flow path area, and the pressure of the fire-extinguishing fluid at the fluid outlet is the flow of the piston valve. In the pressure control valve that is reduced by movement toward the decrease direction of the road area and increased by movement toward the increase direction of the flow path area, an oil tank having an oil storage space communicating with the annular space is provided, and the oil storage wherein the oil that will be introduced into the space storage is filled up in the annular space.
According to the present invention, the oil filled in the annular space causes friction between the valve body and the piston valve, friction between the spring and the inner periphery of the valve body, friction between the spring and the outer periphery of the piston valve. In addition, the spring, valve body, and piston valve can be prevented from being soiled or rusted. Thereby, the elastic deformation of the spring accompanying the movement of the piston valve is prevented, and the pressure of the fire-extinguishing fluid can be appropriately controlled.
[0009]
The level of oil stored in the oil storage space is preferably positioned above the annular space. Thereby, even if the volume of the annular space fluctuates due to the movement of the piston valve, the annular space can always be reliably filled with oil.
[0010]
The volume of the annular space is reduced by the movement of the piston valve in the decreasing direction of the flow path area, and is increased by the movement of the piston valve in the increasing direction of the flow path area, and the piston is placed in the oil tank in the annular space. A second spring is provided which is inserted so as to be able to reciprocate in accordance with a change in volume and applies elasticity to the piston so as to push oil stored in the oil storage space toward the annular space by the piston . Is preferred.
As a result, not only the elasticity of the spring but also the elasticity of the second spring acts on the piston valve, so that the position of the piston valve can be adjusted according to the elasticity of the second spring, and the pressure at the fluid outlet of the fire-extinguishing fluid can be adjusted.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A fire engine 1 shown in FIGS. 1 and 2 includes a fire-extinguishing water discharge pump 4 built in a vehicle body 3 supported by wheels 2. A pipe 5 connected to the suction side of the pump 4 is connected to an open / close cock 6 and a natural water supply port 7 provided on the side surface of the vehicle body 3. The pipe 5 is connected to the open / close cock 6 via a pressure control valve 10 for a fire extinguishing fluid. Connected to the suction port 6a opened and closed by the open / close cock 6 is a hose that conveys pressure-extinguishing water (exceeding atmospheric pressure) sent from a fire-fighting fluid supply source such as another fire engine or a fire hydrant. One end of a water supply hose 8 for natural water supply that is held on the side surface of the fire engine 1 is connected to the natural water supply port 7. The other end of the water supply hose 8 for natural water supply is immersed in fire extinguishing water at atmospheric pressure such as a pond or a river. Fire extinguishing water discharged from the pump 4 is sent out to other fire engines, water guns, etc. via piping equipment (not shown). The fire engine may be equipped with a chemical agent tank, mix fire-fighting water discharged from a pump with a chemical agent, and send out a mixture of the chemical agent and water as a fire-extinguishing fluid. Further, a mixed solution of a chemical agent and water as a fire extinguishing fluid may be sucked into the pump 4 through the suction port 6a.
[0012]
As shown in FIG. 3, the pressure control valve 10 includes a cylindrical valve body 11 and a cylindrical piston valve 12 that is inserted coaxially into the valve body 11 and is capable of reciprocating in the axial direction.
[0013]
The valve body 11 includes cylindrical first to third members 11a, 11b, and 11c. The outer periphery of one end of the second member 11b is screwed to the inner periphery of one end of the first member 11a via the seal ring 11d. The outer periphery of the other end of the two member 11b is screwed to the inner periphery of one end of the third member 11c via a seal ring 11e. A screw hole 11g is formed in the first member 11a to which a connecting bolt for connecting the drain pipe connection port 11f and the suction side opening / closing cock 6 is screwed, and a screw hole in which the connecting bolt for connecting the pipe 5 is screwed to the third member 11c. 11h is formed. One end of the valve body 11 is a fluid inlet 13 connected to a fire extinguishing fluid supply source, and the other end is a fluid outlet 14 connected to the pump 4. As indicated by the arrows in the figure, the fire-extinguishing fluid that has flowed into the valve body 11 from the fluid inlet 13 passes through the inside of the piston valve 12 and flows out from the fluid outlet 14.
[0014]
The piston valve 12 is fitted to the valve body 11 via seal rings 16a and 16b. The piston valve 12 has a flange portion 12a that projects outward in the vicinity of the end on the fluid outlet 14 side.
[0015]
The end surface of the piston valve 12 on the fluid inlet 13 side constitutes a first pressure receiving surface 21 that receives the pressure of the fire-extinguishing fluid at the fluid inlet 13. The end surface 12 'on the fluid outlet 14 side of the piston valve 12 and the end surface 12a "on the fluid outlet 14 side of the flange portion 12a constitute a second pressure receiving surface 22 that receives the pressure of the fire-extinguishing fluid at the fluid outlet 14. The area of the second pressure receiving surface 22 is larger than the area of the first pressure receiving surface 21. Note that, between the inner periphery 11c 'of the third member 11c constituting the valve body 11 and the outer periphery of the piston valve 12. Since the gap is provided, the pressure of the fire-extinguishing fluid at the fluid outlet 14 acts on the end surface 12a ″ of the flange portion 12a on the fluid outlet 14 side.
[0016]
A fluid passage 17 is formed between the fluid inlet 13 and the fluid outlet 14 so that the flow passage area changes in accordance with the movement of the piston valve 12. That is, a nut 31 is concentrically fixed to the inner periphery of the valve body 11 via a connecting plate 32, and a control member 34 is attached to a screw shaft 33 that is screwed onto the nut 31. The control member 34 has a shape in which the large diameter ends of two truncated cones concentric with the valve body 11 are joined to each other, and is disposed at a position facing the first pressure receiving surface 21. A fluid passage 17 is formed between the control member 34 and the first pressure receiving surface 21.
[0017]
The pressure of the fire-extinguishing fluid at the fluid outlet 14 is reduced by reducing the flow passage area of the fluid passage 17 due to the movement of the piston valve 12 in the direction toward the fluid inlet 13, and the flow in the direction toward the fluid outlet 14 is reduced. It is increased by increasing the road area.
[0018]
An oil-tight annular space 18 is formed between the inner periphery of the valve body 11 and the outer periphery of the piston valve 12. A circumferential groove 11i is formed on the inner circumference of the valve body 11, and the outer circumference of the piston valve 12, the inner circumference of the circumferential groove 11i, the end face 11i 'of the circumferential groove 11i on the fluid inlet 13 side, and the end face of the flange portion 12a on the fluid inlet 13 side. A space surrounded by 12 a ′ is an annular space 18. As a result, the volume of the annular space 18 changes according to the movement of the piston valve 12. The volume of the annular space 18 is reduced by the movement of the piston valve 12 in the direction toward the fluid inlet 13, that is, the movement in the direction of decreasing the flow path area, and the movement in the direction toward the fluid outlet 14, that is, the flow path area. Increased by movement in the increasing direction. The flange 12a is in contact with the end surface 11i ″ of the circumferential groove 11i on the fluid inlet 13 side, so that the piston valve 12 is prevented from coming off to the fluid outlet 14 side.
[0019]
A compression coil spring 19 is disposed in the annular space 18. The spring 19 is sandwiched between the end surface 11i 'of the circumferential groove 11i on the fluid inlet 13 side and the end surface 12a' of the flange portion 12a on the fluid inlet 13 side. As a result, the spring 19 is elastically deformed as the piston valve 12 moves. Further, the spring 19 exerts an elastic force that directs the piston valve 12 in the direction of increasing the flow path area.
[0020]
An oil tank 51 having an oil storage space 50 communicating with the annular space 18 is provided. In other words, the valve body 11 is provided with a connection port 11j communicating with the annular space 18, and the annular space 18 and the oil storage space 50 are communicated with each other through the flexible tube 43 connected to the connection port 11j. Oil introduced into the oil storage space 50 is filled in the annular space 18.
[0021]
As shown in FIG. 4, the oil tank 51 has a cylindrical cylinder 52 that is attached to the fire engine 1 with the axial direction as the vertical direction, an upper cap 53 that covers the upper end opening of the cylinder 52, and a lower end opening of the cylinder 52. And a lower cap 54 covered with an oil seal. An air vent hole 53 a is formed in the upper cap 53, and the flexible tube 43 is connected to a connection port 54 a formed in the lower cap 54. A piston 55 is coaxially inserted into the oil tank 51 via an oil seal 56, can be reciprocated in the axial direction of the cylinder 52, and a space surrounded by the piston 55 and the inner surface of the oil tank 51 is oil-tight. It is a space 50. The piston 55 reciprocates as the amount of oil stored in the oil storage space 50 varies according to the volume change of the annular space 18. A second spring 57 is provided that provides elasticity that pushes oil stored in the oil storage space 50 by the piston 55 toward the annular space 18. The second spring 57 is a compression coil spring and is elastically deformed by being sandwiched between the piston 55 and the upper cap 53. The liquid level of the oil stored in the oil storage space 50 is above the annular space 18 so that the oil introduced into the oil storage space 50 fills the annular space 18 without the elastic action of the second spring 57. Be positioned.
[0022]
In the pressure control valve 10, the fire extinguishing which acts on the first pressure receiving surface 21 and the second pressure receiving surface 22 even when the pressure of the fire fighting fluid supplied from the fire fighting fluid supply source is excessive or rapidly fluctuates. By moving the piston valve 12 so that the pressure of the working fluid and the elasticity of the spring 19 are balanced, the pressure of the fire-extinguishing fluid flowing out from the fluid outlet 14 can be maintained in an appropriate range. For example, if the water discharge amount is up to about 1500 L / min, the fire extinguishing fluid flowing out from the fluid outlet 14 when the pressure of the fire extinguishing fluid supplied from the fire extinguishing fluid supply source is about 0.2 MPa to 1.0 MPa. If the pressure of the fluid can be maintained at about 0.05 MPa to 0.35 MPa and the water discharge amount is up to about 2000 L / min, the pressure of the fire extinguishing fluid supplied from the fire fighting fluid supply source is 0.2 MPa to 1 When the pressure is about 5 MPa, the pressure of the fire-extinguishing fluid flowing out from the fluid outlet 14 can be maintained at about 0.05 MPa to 0.55 MPa. In addition, by changing the screwing amount of the screw shaft 33 with respect to the nut 31 to make the control member 34 variable, the flow passage area of the fluid passage 17 can be changed and the pressure at the fluid outlet 14 of the fire-extinguishing fluid can be adjusted. It is possible.
[0023]
According to the pressure control valve 10, the oil filled in the annular space 18 causes friction between the valve body 11 and the piston valve 12, friction between the spring 19 and the inner periphery of the valve body 11, Friction with the outer periphery of the piston valve 12 can be reduced, and contamination, rust, etc. of the spring 19, the valve body 11, and the piston valve 12 can be prevented. Thereby, the elastic deformation of the spring 19 accompanying the movement of the piston valve 12 is prevented from being inhibited, and the pressure of the fire-extinguishing fluid can be appropriately controlled. Further, since the liquid level of the oil stored in the oil storage space 50 is positioned above the annular space 18, even if the volume of the annular space 18 fluctuates due to the movement of the piston valve 12, the annular space 18 is always filled with oil. Can be satisfied. Further, not only the elasticity of the spring 19 but also the elasticity of the second spring 57 acts on the piston valve 12, so that the position of the piston valve 12 is adjusted according to the elasticity of the second spring 57, and at the fluid outlet 14 of the fire-extinguishing fluid. The pressure can be adjusted. For example, the elasticity of the second spring 57 can be changed by changing the amount of oil stored in the oil storage space 50, and the pressure at the fluid outlet 14 of the fire-extinguishing fluid can be adjusted.
[0024]
The present invention is not limited to the above embodiment. For example, as shown in the first modified example of FIG. 5, the piston 55 and the second spring 57 in the above embodiment are eliminated inside the oil tank 51, and the internal pressure fluctuation of the oil storage space 50 is prevented and the oil storage space 50 is restored. In order to prevent dust from entering, a known breather 60 with a filter composed of check valves 60a and 60b and a filter 60c arranged in parallel may be attached to the oil tank 51. Further, in the oil tank 51 of the second modified example of FIG. 6, the piston 55 and the second spring 57 in the above embodiment are eliminated, and one end of the cylindrical screw member 43 ′ is attached to the nut 61 welded to the oil tank 51. The other end of the cylindrical male screw member 43 ′ is screwed to the connection port 11 j in the valve body 11, and the oil storage space is replaced with the nut 61 and the inner peripheral hole of the cylindrical male screw member 43 ′ instead of the flexible tube 43. 50 is communicated with the annular space 18, and oil introduced into the oil storage space 50 from the oil supply port 51c is filled into the annular space 18, and the oil supply port 51c is screwed with a cap (not shown) with a level gauge. It can be closed by combining them.
[0025]
【The invention's effect】
According to the pressure control valve of the present invention, the pressure of the fire-extinguishing fluid can be properly controlled, and the pressure can be easily adjusted.
[Brief description of the drawings]
FIG. 1 is a side view for explaining the arrangement of pressure control valves according to an embodiment of the present invention. FIG. 2 is a plan view for explaining the arrangement of pressure control valves according to an embodiment of the present invention. FIG. 4 is a partially broken side view of the oil tank of the pressure control valve according to the embodiment of the present invention. FIG. 5 is a partially broken view of the oil tank of the pressure control valve according to the first modification of the present invention. Side view [FIG. 6] Partially cutaway side view of the oil tank of the pressure control valve of the second modified example of the present invention
4 Fire-extinguishing fluid discharge pump 10 Pressure control valve 11 Valve body 12 Piston valve 13 Fluid inlet 14 Fluid outlet 17 Fluid passage 18 Annular space 19 Spring 21 First pressure receiving surface 22 Second pressure receiving surface 50 Oil storage space 51 Oil tank 55 Piston 57 Second spring

Claims (3)

消火用流体供給源に接続される流体入口と消火用流体吐出ポンプに接続される流体出口とを有するバルブボディと、
前記バルブボディに往復移動可能に挿入されるピストンバルブと、
前記流体入口と前記流体出口との間において前記ピストンバルブの移動に応じて流路面積が変化する流体通路と、
前記バルブボディの内周と前記ピストンバルブの外周との間に、前記ピストンバルブの移動に応じて容積変化するように形成された環状空間と、
前記環状空間に前記ピストンバルブの移動に伴い弾性変形するように配置されるバネとを備え、
前記ピストンバルブは、前記流体入口側における消火用流体の圧力を受ける第1受圧面と、前記流体出口側における消火用流体の圧力を受ける第2受圧面とを有し、
前記第2受圧面の面積は前記第1受圧面の面積よりも大きくされ、
前記バネにより、前記ピストンバルブを前記流路面積の増大方向に向かわせる弾力が作用され、
前記流体出口における消火用流体の圧力は、前記ピストンバルブの前記流路面積の減少方向に向かう移動により低減され、前記流路面積の増大方向に向かう移動により増大される圧力制御弁において、
前記環状空間に通じるオイル貯留空間を有するオイルタンクが設けられ、
前記オイル貯留空間に導入され貯留されるオイルが前記環状空間にまで充填されることを特徴とする消火用流体の圧力制御弁。
A valve body having a fluid inlet connected to a fire fighting fluid supply source and a fluid outlet connected to a fire fighting fluid discharge pump;
A piston valve inserted in the valve body so as to be reciprocally movable;
A fluid passage whose flow path area changes according to movement of the piston valve between the fluid inlet and the fluid outlet;
An annular space formed between the inner periphery of the valve body and the outer periphery of the piston valve so as to change in volume according to the movement of the piston valve;
A spring disposed in the annular space so as to be elastically deformed with the movement of the piston valve;
The piston valve has a first pressure receiving surface that receives the pressure of the fire-extinguishing fluid on the fluid inlet side, and a second pressure receiving surface that receives the pressure of the fire-extinguishing fluid on the fluid outlet side,
The area of the second pressure receiving surface is larger than the area of the first pressure receiving surface,
The spring exerts an elastic force that directs the piston valve in the increasing direction of the flow path area,
In the pressure control valve, the pressure of the fire-extinguishing fluid at the fluid outlet is reduced by the movement of the piston valve toward the decreasing direction of the flow path area, and is increased by the movement of the flow path area toward the increasing direction.
An oil tank having an oil storage space communicating with the annular space is provided;
Pressure control valve of the fire-extinguishing fluid, wherein the oil reservoir is introduced into the space storage is Ru oil is filled up to the annular space.
前記オイル貯留空間に貯留されるオイルの液面は前記環状空間の上方に位置される請求項1に記載の消火用流体の圧力制御弁。The pressure control valve for a fire-extinguishing fluid according to claim 1, wherein a level of oil stored in the oil storage space is positioned above the annular space. 前記環状空間の容積は、前記ピストンバルブの前記流路面積の減少方向に向かう移動により低減され、前記流路面積の増大方向に向かう移動により増大され、
前記オイルタンク内にピストンが前記環状空間の容積変化に応じて往復移動可能に挿入され、
前記ピストンにより前記オイル貯留空間に貯留されるオイルを前記環状空間に向かい押し出すように、前記ピストンに弾力を付与する第2バネが設けられている請求項1に記載の消火用流体の圧力制御弁。
The volume of the annular space is reduced by the movement of the piston valve toward the decreasing direction of the flow path area, and is increased by the movement of the piston valve toward the increasing direction of the flow path area,
A piston is inserted into the oil tank so as to be able to reciprocate according to a change in volume of the annular space,
2. The pressure control valve for a fire-extinguishing fluid according to claim 1 , wherein a second spring is provided to apply elasticity to the piston so as to push oil stored in the oil storage space toward the annular space by the piston. .
JP2003057246A 2003-03-04 2003-03-04 Fire control fluid pressure control valve Expired - Lifetime JP3876230B2 (en)

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JP3876230B2 true JP3876230B2 (en) 2007-01-31

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