JP3631843B2

JP3631843B2 - Flowing water detector

Info

Publication number: JP3631843B2
Application number: JP12337896A
Authority: JP
Inventors: 充希吉田; 忠裕奥田; 健志堀
Original assignee: Yamato Protec Corp
Current assignee: Yamato Protec Corp
Priority date: 1996-05-17
Filing date: 1996-05-17
Publication date: 2005-03-23
Anticipated expiration: 2016-05-17
Also published as: JPH09299501A

Description

【０００１】
【発明の属する技術分野】
本発明は、スプリンクラー設備に使用されるスウィング作動弁型の流水検知装置に関する。
【０００２】
【従来の技術】
この種の作動弁型の流水検知装置は、一次側から二次側への流水により逆止弁体が開き回動すると、該逆止弁体と共に回動するスピンドルの一端部により信号発生手段が駆動されて信号を出力し、電気的に警報を発するものとなっている。通常、流水検知装置１個に対し、二次側には複数個のスプリンクラーヘッドが設置されている。そして火災が発生し、スプリンクラーから放水が行われると、流水検知装置の一次側から二次側への流水に応じて逆止弁体が回動し、逆止弁体と共に回動するスピンドルの回動角をセンサで検出して警報を発する。その感知は、スプリンクラー１個の流水量（５０ｌ／ｍｉｎａｔ１ｋｇｆ／ｃｍ^２）から複数個（通常、数十個）の流量範囲において検知されるものでなければならない。
【０００３】
【発明が解決しようとする課題】
しかるに、作動弁型の上記流水検知装置では、実際に火災が発生していなくても、例えば二次側配管での漏水や点検中の少量の出水等により、また他の防火区域への送水のためのポンプ起動に際して流水検知装置の逆止弁体が僅かに開き回動する。この逆止弁体の僅かな回動角度は、火災発生によりスプリンクラー１個が作動したときの逆止弁体の回動角度とそれ程の差が無く、また、一般に角度変化による感知方法は誤差が出やすく、設定感知角度は実際、感知角度を広く含む為、感知してはならない角度と感知しなくてはならない角度との間での警報感知角度の設定は非常に難しく、又実火災が無くても警報するという誤報も多発していた。
この点についての改良型とも言える流水検知装置が、特開平７−２６５４５４号公報で提案されている。そこでは、逆止弁体これ自体にも細い流水路を形成し、この流水路にボール弁を介入することにより、二次側配管での漏水等のような非火災時の少量流水が生じたときはその細い流水路のボール弁が開いて通水するようにしている。
しかしながら、逆止弁体これ自体に設けた細い流水路及び小さいボール弁にはスラッジやごみ等が詰まり易く、その機能を充分に発揮しないおそれがある。
【０００４】
そこで本発明の目的は、このような問題を解消するためになされたもので、非火災時の少量流水時における誤報を確実に予防でき、火災警報の確実性を図ることのできる流水検知装置を提供することにある。
【０００５】
【課題を解決するための手段】
本発明は、流水制御弁と信号発生手段とからなり、前記流水制御弁は、一次側の流入口と二次側の流出口とを有し、両者間に弁座を介して弁室を形成した弁本体と、前記弁室に、前記流入口から流出口への流水圧によって開かれるよう回動可能にスピンドルまわりに軸支された逆止弁体とを有し、前記スピンドルは前記逆止弁体と共に回動可能に装着され一端が前記弁本体の外部へ突出しており、前記信号発生手段は前記逆止弁体の回動に伴って回動する前記スピンドルの前記突出端の回動角を検出して信号を発するセンサからなる作動弁型の流水検知装置において、前記逆止弁体から円弧状突起体を流入口側へ向けて突設するが、この円弧状突起体は前記逆止弁体の回動中心を中心として描く円弧状に、かつ前記弁座の内径よりも僅かに小さい直径をもつ断面円形状に形成し、以て弁座の内周と円弧状突起体とで形成される環状のすきま部の断面を流路断面積とすることを特徴とする。
【０００６】
上記円弧状突起体に代えて、上記逆止弁体を受ける弁座から円弧筒状壁を前記逆止弁体の外周を囲むよう流出口側へ向けて突設し、該円弧筒状壁は前記逆止弁体の回動中心を中心として描く円弧状に、かつ前記逆止弁体の断面直径よりも僅かに大きい内径を持つ横断面Ｃ形に形成し、以て逆止弁体の外周と円弧筒状壁の内周とで形成される環状のすきま部の断面を流路断面積とすることもできる。
【０００７】
【作用】
弁座の内周と円弧状突起体とで形成される環状のすきま部の断面を流路断面積とすることで、本来の流路断面積に比較して非常に小さくなるため少量の流水により逆止弁体が急激に大きく回動し、それに伴い回動するスピンドルの回動角度も急激に大きく作動する。円弧状突起体の開き回動終点以後は、流路径が弁座の内径となるので、流量が大きく増えてもスピンドルの回動角度はそれ程大きく変動しないようになる。
従って、例えば、実火災によるスプリンクラー作動時の最低流量である５０ｌ／ｍｉｎａｔ１ｋｇｆ／ｃｍ^２を円弧状突起体の開き回動終点の目安とし、その時のスピンドル回動角度よりやや小さい角度を感知角度に設定することで、流水検知装置内の通水量が少ない時のスピンドル回動角度と、スプリンクラーヘツドが作動し放水した時のスピンドル回動角度との差を大きく採ることができる。
弁座から円弧筒状壁を逆止弁体の外周をすきま部をおいて囲むよう流出口側へ向けて突設することによっても、同様の作用が働く。
【０００８】
【発明の実施の形態】
（実施例１）
図１は本発明に係る流水検知装置の縦断面図、図２は図１におけるＡ−Ａ線断面図、図３は同装置の平面図、図４は同装置の正面図、図５は同装置の側面図である。図１及び図２において、１は流水検知装置を構成する流水制御弁、２は弁本体で、送水ポンプ側に接続される一次側の流入口３と、スプリンクラーヘツド側に接続される二次側の流出口４とを有し、両者の間に弁座５を介して弁室６が形成されている。弁室６の一側方には排水管に接続される排水口７を有し、その排水口７と直交する他側方には開口部８を有し、この開口部８を蓋９で塞いでいる。弁室６には逆止弁体１０が、流入口３から流出口４への流水圧によってスピンドル１１まわりに開き回動可能に軸支されている。逆止弁体１０は円盤状に形成されてこの一端に軸通孔１２を有するハブ１３を突設し、その軸通孔１２にスピンドル１１を嵌合するとともに、ハブ１３及びスピンドル１１に抜止ピン１４を直交状に打ち込むことによりスピンドル１１が逆止弁体１０と一体的に結合される。
【０００９】
図２において、弁本体２の弁室６の内面に一対のボス１５，１６が相対向状に突設され、一方のボス１５には軸孔１７を盲状にあけ、他方のボス１６には軸孔１８を弁本体２の内外方向にわたって貫通するようにあける。そして、逆止弁体１０のハブ１３の一端から突出するスピンドル１１の一端は弁室６内の一方のボス１５の軸孔１７に挿入し、ハブ１３の他端から突出するスピンドル１１の他端を、他方のボス１６の軸孔１８に挿入した別のスピンドル１９の一端に軸接手２０を介して連結する。軸接手２０は弁本体２のボス１６に挿通されたスピンドル１９の端にピン２１を直交状に植設する一方、逆止弁体１０に挿通されたスピンドル１１の端に盲孔２２及び溝２３を設けてその溝２３に前記ピン２１を嵌合させてなる。
【００１０】
図４及び図５において、上記スピンドル１９の弁本体２の外部に突出した端部１９ａの近傍位置には、このスピンドル１９の回動角検出用のセンサ２４を設置する。そのセンサ２４としては、近接スイッチ、リードスイッチ、そのほかマイクロスイッチあるいはリミットスイッチなどが挙げられる。図示例では近接スイッチ２５を取り付け、この近接スイッチ２５により、逆止弁体１０と共に回動するスピンドル１１，１９の回動角を検出して信号を出力し、電気的に警報を発する信号発生手段を構成する。近接スイッチ２５は、前記スピンドル１９の弁本体２の外部に突出した端部１９ａに固定した近接体２６を近接スイッチ２５の検出ヘッド２５ａ，２５ｂの両者間に挿入することで動作し、両者間から離すと接点が復帰する。
【００１１】
上記構成の流水検知装置において、本発明は、上記逆止弁体１０から円弧状突起体２７を流入口３側へ向けて突設する点に特徴を有する。図１に示すように、その円弧状突起体２７は逆止弁体１０の回動中心を中心として描く円弧状に、かつ弁座５の内径よりも僅かに小さい直径をもつ断面円形状に形成されるとともに、その上端に小径の凸部２８が設けられる。そして円弧状突起体２７は凸部２８を逆止弁体１０の流入口側に面する下端面１０ａに設けた凹部２９に嵌合固定するとともに、逆止弁体１０の上端面からねじ３０をねじ込み、このねじ３０の締めつけで逆止弁体１０に円弧状突起体２７が一体的に結合される。例えば、弁座５の内径は３６ｍｍ、円弧状突起体２７の直径は３１ｍｍ、円弧状突起体２７の突出端面２７ａと逆止弁体１０の下端面１０ａとが成す角度θは３０°とする。これにより弁座５の内周と円弧状突起体２７との間に環状のすきま部３１が形成され、このすきま部３１の断面を流路断面積とする。
【００１２】
しかるときは、上記すきま部３１の流路断面積は本来の流路断面積に比較して非常に小さくなるため、二次側配管での漏水や点検中の少量の出水等による少量の流水により逆止弁体１０が急激に大きく回動し、それに伴い回動するスピンドル１１，１９の回動角度も急激に大きく作動する。円弧状突起体２７の先端面２７ａが弁座５から離れる開き回動終点以後は、流路径が弁座５の内径となるので、流量が大きく増えてもスピンドル１１，１９の回動角度はそれ程大きく変動しない。
【００１３】
図６に流水量と逆止弁体の開き角との関係を従来の逆止弁体と比較して示す。本発明品は逆止弁体１０に円弧状突起体２７（直径は３１ｍｍ、角度θは３０°、弁座５の内径は３６ｍｍ）を設け、水圧１Ｋｇｆ／ｍｉｎで２回テストした。１回目のテスト結果を破線Ａで示し、２回目のテスト結果を一点鎖線Ｂで示す。従来品は上記円弧状突起体２７を有しない通常の平板形状の逆止弁体を用いた。尤も、本発明品のテスト条件と同様に弁座の内径を３６ｍｍとし、水圧１Ｋｇｆ／ｍｉｎの条件でテストした。その結果を実線Ｃで示す。
この図６から明らかなように、本発明品Ａ，Ｂでは、少量（１５〜２０ｌ／ｍｉｎ）の流水により逆止弁体１０が急激に大きく回動し、スプリンクラー作動時の最低流水量である５０ｌ／ｍｉｎａｔ１ｋｇｆ／ｃｍ^２の流水により逆止弁体１０の開き角は大きく、約３０°であった。これに対し従来品Ｃでは少量（１５〜２０ｌ／ｍｉｎ）の流水により逆止弁体の開き角の上昇は緩やかであり、スプリンクラー作動時の最低流水量である５０ｌ／ｍｉｎａｔ１ｋｇｆ／ｃｍ^２の流水により逆止弁体は約１５°程度しか開かなかった。
【００１４】
従って、本発明品Ａ，Ｂにおいては、流量感知角度は０〜３０°の間の広範囲内にとることができ、実用上では二次側配管内での漏水や点検中の少量の流出により、また他の防火区域への送水のためのポンプ起動に際した逆止弁体の僅かな開きにおいては感知せず、スプリンクラー作動時の最低流水量である５０ｌ／ｍｉｎａｔ１ｋｇｆ／ｃｍ^２の時には必ず作動する角度として、例えば１５〜２０°の間の角度を感知角度に設定すればよい。これに対し、従来品Ｃにおいては、スプリンクラー作動時の最低流水量（５０ｌ／ｍｉｎａｔ１ｋｇｆ／ｃｍ^２）の流水による逆止弁体の開き角は１５°しかないので、例えば作動角度を７．５〜１０°の間に設定したとき、少量流水時の作動してはならない角度や、流水量５０ｌ／ｍｉｎａｔ１ｋｇｆ／ｃｍ^２の必ず作動しなければならない角度からの角度巾の余裕が無い為、誤作動を起こし易い。
【００１５】
（実施例２）
図７および図８は本発明の第２実施例を示す。この実施例では、上記円弧状突起体２７に代えて、弁座５から円弧筒状壁３２を逆止弁体１０の外周を所定のすきま部３３を介して囲むよう流出口３側へ向けて突設する。その円弧筒状壁３２は逆止弁体１０の回動中心を中心として描く円弧状に、かつ逆止弁体１０の断面直径よりも僅かに大きい内径を持つ横断面Ｃ形に形成することにより、逆止弁体１０の外周と円弧筒状壁３２の内周とで形成される環状のすきま部３３の断面を流路断面積とする。円弧筒状壁３２の横断面をＣ形に形成するのは、円弧筒状壁３２の円周一部に切欠部３２ａを設け、この切欠部３２ａにより逆止弁体１０とハブ１３とをつなぐ細い首状の連接部１０ｃと干渉するのを避けるためである。その他の構成は上記実施例１の場合と同様である。これにおいても、上記実施例１の場合と同様に、流水検知装置内の通水量が少ない時のスピンドル回動角度と、スプリンクラーヘツドが作動し放水した時のスピンドル回動角度との差を大きく採ることができる。
【００１６】
【発明の効果】
本発明によれば、逆止弁体から円弧状突起体を流入口側へ向けて突設し、この円弧状突起体は前記逆止弁体の回動中心を中心として描く円弧状に、かつ前記弁座の内径よりも僅かに小さい直径をもつ断面円形状に形成して、弁座の内周と円弧状突起体とで形成される環状のすきま部の断面を流路断面積とした。したがって、流水検知装置内の通水量が少ない時のスピンドルの回動角度と、スプリンクラーヘッドが作動し放水した時のスピンドルの回動角度との差を大きく採ることができ、流水感知角度をスプリンクラーヘッド１個が作動した時の流水時角度の近くに設定することで、非火災時の少量通水時に誤報を発するおそれが無くなる。また弁座の内周と円弧状突起体との間に形成される流路断面積の小さいすきま部は環状であるため、スラッジやごみ等が詰まるのを避けることができてそのすきま部での流水機能が低下するおそれもなく、常に確実に作動できて有利である。
【００１７】
弁座から円弧筒状壁を逆止弁体の外周をすきま部をおいて囲むよう流出口側へ向けて突設することによっても、同様に流水感知角度をスプリンクラーヘッド１個が作動した時の流水時角度の近くに設定することで非火災時の少量通水時の誤報を無くすることができ、またスラッジやごみ等の詰まり問題を解消することもできる。
【図面の簡単な説明】
【図１】実施例１の流水検知装置の縦断面図である。
【図２】図１におけるＡ−Ａ線断面図である。
【図３】実施例１の流水検知装置の平面図である。
【図４】実施例１の流水検知装置の正面図である。
【図５】実施例１の流水検知装置の側面図である。
【図６】実施例１の流水検知装置の流水量と弁の開き角との関係を示す説明図である。
【図７】実施例２の流水検知装置の縦断面図である。
【図８】図７におけるＢ−Ｂ線断面図である。
【符号の説明】
１流水制御弁
２弁本体
３流入口
４流出口
５弁座
６弁室
１０逆止弁体
１１，１９スピンドル
２４センサ
２７円弧状突起体
３２円弧筒状壁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swing-acting-valve type water flow detection device used in a sprinkler facility.
[0002]
[Prior art]
In this type of actuated valve type water flow detector, when the check valve body is opened and rotated by water flowing from the primary side to the secondary side, the signal generating means is provided by one end of the spindle that rotates together with the check valve body. It is driven to output a signal and to electrically issue an alarm. Usually, a plurality of sprinkler heads are installed on the secondary side with respect to one flowing water detection device. When a fire occurs and water is discharged from the sprinkler, the check valve body rotates according to the water flow from the primary side to the secondary side of the water flow detection device, and the spindle that rotates together with the check valve body rotates. The moving angle is detected by a sensor and an alarm is issued. The sensing must be detected in a flow rate range of one sprinkler (50 l / min at 1 kgf / cm ² ) to a plurality (usually several tens) of flow rate.
[0003]
[Problems to be solved by the invention]
However, even if there is no actual fire in the above-mentioned operating valve type water flow detection device, for example, due to water leakage in the secondary piping or a small amount of water being discharged during inspection, water supply to other fire prevention areas is also possible. When the pump is started, the check valve body of the flowing water detector slightly opens and rotates. The slight rotation angle of the check valve body is not so different from the rotation angle of the check valve body when one sprinkler is activated due to the occurrence of a fire. Because the set detection angle includes a wide range of detection angles, it is very difficult to set the alarm detection angle between the angle that must not be detected and the angle that must be detected, and there is no actual fire However, there were many false alarms about alarming.
Japanese Patent Laid-Open No. 7-265454 proposes a flowing water detection device that can be said to be an improved type in this regard. There, a small water flow channel was formed in the check valve body itself, and a ball valve intervened in this water flow channel, resulting in a small amount of non-fired water flow such as water leakage in the secondary piping. Sometimes the ball valve in the narrow water channel opens to allow water to pass through.
However, the slender water channel and the small ball valve provided in the check valve body itself are likely to be clogged with sludge, dust, etc., and their functions may not be fully exhibited.
[0004]
Therefore, an object of the present invention was made to solve such problems, and a water flow detection device that can reliably prevent false alarms when a small amount of water flows during non-fire and can ensure the reliability of a fire alarm. It is to provide.
[0005]
[Means for Solving the Problems]
The present invention comprises a running water control valve and a signal generating means, and the running water control valve has a primary side inlet and a secondary side outlet, and forms a valve chamber through a valve seat therebetween. And a check valve body pivotally supported around the spindle so as to be opened by flowing water pressure from the inlet to the outlet. A rotation angle of the protruding end of the spindle, which is rotatably mounted with the valve body and has one end protruding to the outside of the valve main body, and the signal generating means rotates with the rotation of the check valve body. In the working valve type water flow detection device comprising a sensor that detects a signal and emits a signal, an arc-shaped protrusion projects from the check valve body toward the inlet, and the arc-shaped protrusion is the check valve. Arc shape drawn around the center of rotation of the valve body and slightly smaller than the inner diameter of the valve seat There is formed in circular cross section with a diameter, characterized in that the cross-section of the flow path cross-sectional area of the clearance of the annular formed by the inner periphery and an arc-shaped protrusion of the valve seat Te following.
[0006]
Instead of the arcuate protrusion, an arcuate cylindrical wall is projected from the valve seat that receives the check valve body toward the outlet side so as to surround the outer periphery of the check valve body, and the arcuate cylindrical wall is The check valve body is formed in an arc shape drawn around the rotation center of the check valve body, and has a cross section C shape having an inner diameter slightly larger than the cross-sectional diameter of the check valve body, and thus the outer periphery of the check valve body And the cross-sectional area of the annular gap formed by the inner periphery of the arcuate cylindrical wall may be the flow path cross-sectional area.
[0007]
[Action]
By making the cross-section of the annular clearance formed by the inner periphery of the valve seat and the arcuate protrusion a flow-path cross-sectional area, it becomes very small compared to the original flow-path cross-sectional area. The check valve body suddenly and greatly rotates, and the rotation angle of the spindle that rotates with the check valve body also operates rapidly and greatly. Since the flow path diameter becomes the inner diameter of the valve seat after the opening rotation end point of the arcuate protrusion, the rotation angle of the spindle does not vary so much even if the flow rate increases greatly.
Therefore, for example, 50 l / min at 1 kgf / cm ² , which is the minimum flow rate when the sprinkler is activated due to an actual fire, is used as a guideline for the opening rotation end point of the arcuate protrusion, and a slightly smaller angle than the spindle rotation angle at that time is the sensing angle. By setting to, it is possible to take a large difference between the spindle rotation angle when the water flow amount in the flowing water detection device is small and the spindle rotation angle when the sprinkler head is activated and discharged.
The same effect can be obtained by projecting the circular arc cylindrical wall from the valve seat toward the outlet side so as to surround the outer periphery of the check valve body with a clearance.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
(Example 1)
1 is a longitudinal sectional view of a flowing water detection apparatus according to the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a plan view of the apparatus, FIG. 4 is a front view of the apparatus, and FIG. It is a side view of an apparatus. 1 and 2, 1 is a water flow control valve constituting the water flow detection device, 2 is a valve body, a primary side inlet 3 connected to the water pump side, and a secondary side connected to the sprinkler head side. And a valve chamber 6 is formed between the two through a valve seat 5. One side of the valve chamber 6 has a drain port 7 connected to the drain pipe, and the other side perpendicular to the drain port 7 has an opening 8, and the opening 8 is closed with a lid 9. It is out. A check valve body 10 is pivotally supported in the valve chamber 6 so as to open and rotate around the spindle 11 by flowing water pressure from the inlet 3 to the outlet 4. The check valve body 10 is formed in a disc shape, and a hub 13 having a shaft through hole 12 is projected from one end thereof. The spindle 11 is fitted into the shaft through hole 12, and the hub 13 and the spindle 11 have a retaining pin. The spindle 11 is integrally coupled to the check valve body 10 by driving 14 in an orthogonal shape.
[0009]
In FIG. 2, a pair of bosses 15, 16 project from the inner surface of the valve chamber 6 of the valve body 2 so as to face each other. A shaft hole 17 is opened blindly in one boss 15, and the other boss 16 has The shaft hole 18 is made to penetrate through the valve body 2 in the inner and outer directions. One end of the spindle 11 protruding from one end of the hub 13 of the check valve body 10 is inserted into the shaft hole 17 of one boss 15 in the valve chamber 6, and the other end of the spindle 11 protruding from the other end of the hub 13. Is connected to one end of another spindle 19 inserted into the shaft hole 18 of the other boss 16 via a shaft joint 20. The shaft joint 20 has a pin 21 implanted at the end of the spindle 19 inserted through the boss 16 of the valve body 2 in an orthogonal shape, while a blind hole 22 and a groove 23 are formed at the end of the spindle 11 inserted through the check valve body 10. And the pin 21 is fitted in the groove 23.
[0010]
4 and 5, a sensor 24 for detecting the rotation angle of the spindle 19 is installed in the vicinity of the end 19a of the spindle 19 projecting outside the valve body 2. Examples of the sensor 24 include a proximity switch, a reed switch, a micro switch, a limit switch, and the like. In the illustrated example, a proximity switch 25 is attached, and the proximity switch 25 detects a rotation angle of the spindles 11 and 19 that rotate together with the check valve body 10, outputs a signal, and generates a signal electrically. Configure. The proximity switch 25 operates by inserting a proximity body 26 fixed to the end 19a of the spindle 19 that protrudes outside the valve body 2 between the detection heads 25a and 25b of the proximity switch 25. The contact returns when released.
[0011]
In the flowing water detection device having the above-described configuration, the present invention is characterized in that the arc-shaped protrusion 27 protrudes from the check valve body 10 toward the inlet 3 side. As shown in FIG. 1, the arc-shaped protrusion 27 is formed in an arc shape centered on the rotation center of the check valve body 10 and in a circular cross section having a diameter slightly smaller than the inner diameter of the valve seat 5. In addition, a small-diameter convex portion 28 is provided at the upper end thereof. The arcuate protrusion 27 fits and fixes the convex portion 28 to the concave portion 29 provided on the lower end surface 10 a facing the inlet side of the check valve body 10, and the screw 30 is inserted from the upper end surface of the check valve body 10. When the screw 30 is screwed and the screw 30 is tightened, the arc-shaped protrusion 27 is integrally coupled to the check valve body 10. For example, the inner diameter of the valve seat 5 is 36 mm, the diameter of the arc-shaped protrusion 27 is 31 mm, and the angle θ formed by the protruding end surface 27a of the arc-shaped protrusion 27 and the lower end surface 10a of the check valve body 10 is 30 °. As a result, an annular clearance 31 is formed between the inner periphery of the valve seat 5 and the arcuate protrusion 27, and the cross section of the clearance 31 is defined as a flow path cross-sectional area.
[0012]
In this case, the flow passage cross-sectional area of the clearance 31 is very small compared to the original flow passage cross-sectional area. Therefore, due to a small amount of running water due to water leakage in the secondary side pipe or a small amount of water discharged during inspection, etc. The check valve body 10 suddenly and greatly rotates, and the rotation angles of the spindles 11 and 19 that rotate with the check valve body 10 operate rapidly and greatly. After the opening rotation end point at which the distal end surface 27a of the arcuate protrusion 27 is separated from the valve seat 5, the flow path diameter becomes the inner diameter of the valve seat 5. Therefore, even if the flow rate increases greatly, the rotation angle of the spindles 11 and 19 is much higher. Does not fluctuate greatly.
[0013]
FIG. 6 shows the relationship between the amount of flowing water and the opening angle of the check valve body in comparison with the conventional check valve body. In the product of the present invention, the check valve body 10 was provided with an arc-shaped protrusion 27 (diameter 31 mm, angle θ 30 °, valve seat 5 inner diameter 36 mm), and tested twice at a water pressure of 1 kgf / min. The first test result is indicated by a broken line A, and the second test result is indicated by a one-dot chain line B. The conventional product uses a normal flat check valve body that does not have the arc-shaped protrusion 27. However, similar to the test conditions of the product of the present invention, the inner diameter of the valve seat was set to 36 mm, and the test was performed under the condition of a water pressure of 1 kgf / min. The result is indicated by a solid line C.
As is clear from FIG. 6, in the products A and B of the present invention, the check valve body 10 suddenly and greatly rotates by a small amount (15 to 20 l / min) of flowing water, which is the minimum amount of flowing water when the sprinkler is operated. The opening angle of the check valve body 10 was large by flowing water of 50 l / min at 1 kgf / cm ² and was about 30 °. On the other hand, in the conventional product C, the increase in the opening angle of the check valve body is moderate due to a small amount (15 to 20 l / min) of flowing water, and the minimum flowing amount when the sprinkler is operated is 50 l / min at 1 kgf / cm ² . The check valve body opened only about 15 ° by running water.
[0014]
Accordingly, in the products A and B of the present invention, the flow rate sensing angle can be in a wide range of 0 to 30 °, and practically due to water leakage in the secondary side piping or a small amount of outflow during inspection, In addition, a slight opening of the check valve body at the time of starting the pump for water supply to other fire prevention areas is not detected, and it always operates when the minimum flow rate is 50 l / min at 1 kgf / cm ² when the sprinkler is activated. For example, an angle between 15 and 20 degrees may be set as the sensing angle. On the other hand, in the conventional product C, the opening angle of the check valve body by flowing water with the minimum flow amount (50 l / min at 1 kgf / cm ² ) at the time of operating the sprinkler is only 15 °. When the angle is set between 5 and 10 °, there is no margin of angle from the angle that must not be activated when flowing a small amount of water or the angle that must be activated when the flow rate is 50 l / min at 1 kgf / cm ^2. , Easy to malfunction.
[0015]
(Example 2)
7 and 8 show a second embodiment of the present invention. In this embodiment, instead of the arcuate protrusion 27, the arcuate cylindrical wall 32 from the valve seat 5 is directed toward the outlet 3 so as to surround the outer periphery of the check valve body 10 via a predetermined gap 33. Project. The arc-shaped cylindrical wall 32 is formed in an arc shape drawn around the rotation center of the check valve body 10 and in a cross section C shape having an inner diameter slightly larger than the cross-sectional diameter of the check valve body 10. The cross section of the annular clearance 33 formed by the outer periphery of the check valve body 10 and the inner periphery of the circular arc cylindrical wall 32 is defined as a flow path cross sectional area. The circular cross-section of the arc-shaped cylindrical wall 32 is formed in a C shape by providing a notch 32a on a part of the circumference of the arc-shaped cylindrical wall 32 and connecting the check valve body 10 and the hub 13 by the notch 32a. This is to avoid interference with the neck-shaped connecting portion 10c. Other configurations are the same as those in the first embodiment. In this case as well, as in the case of the first embodiment, a large difference is taken between the spindle rotation angle when the amount of water passing through the water flow detector is small and the spindle rotation angle when the sprinkler head is activated and discharged. be able to.
[0016]
【The invention's effect】
According to the present invention, the arc-shaped projection is provided so as to project from the check valve body toward the inlet, and the arc-shaped projection is formed in an arc shape centered on the rotation center of the check valve body, and The cross-sectional area of the annular clearance formed by the inner periphery of the valve seat and the arcuate protrusion was defined as the flow path cross-sectional area. Therefore, it is possible to take a large difference between the rotation angle of the spindle when the water flow amount in the flowing water detection device is small and the rotation angle of the spindle when the sprinkler head is activated and discharged, and the flowing water detection angle is set as the sprinkler head. By setting it close to the running angle when one unit is activated, there is no risk of false alarms when a small amount of water is passed during non-fire. In addition, since the gap with a small cross-sectional area of the flow path formed between the inner periphery of the valve seat and the arcuate protrusion is annular, it is possible to avoid clogging with sludge, dust, etc. There is no fear that the flowing water function will be reduced, and it is always advantageous to operate reliably.
[0017]
Similarly, by projecting the arc-shaped cylindrical wall from the valve seat toward the outlet side so as to surround the outer periphery of the check valve body with a clearance, the flowing water detection angle is similarly set when one sprinkler head is activated. By setting it close to the running angle, it is possible to eliminate misinformation when a small amount of water is passed in a non-fire, and to eliminate clogging problems such as sludge and dust.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a flowing water detection apparatus according to a first embodiment.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a plan view of the flowing water detection device according to the first embodiment.
FIG. 4 is a front view of the flowing water detection apparatus according to the first embodiment.
FIG. 5 is a side view of the flowing water detection device according to the first embodiment.
6 is an explanatory diagram showing the relationship between the amount of water flow and the opening angle of the valve of the water flow detection device of Example 1. FIG.
FIG. 7 is a longitudinal sectional view of the flowing water detection device according to the second embodiment.
8 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flow control valve 2 Valve body 3 Inlet 4 Outlet 5 Valve seat 6 Valve chamber 10 Check valve body 11, 19 Spindle 24 Sensor 27 Arc-shaped protrusion 32 Arc cylindrical wall

Claims

A flow control valve and a signal generating means, the flow control valve having a primary side inlet and a secondary side outlet, and a valve body having a valve chamber formed therebetween via a valve seat; The valve chamber has a check valve body pivotally supported around the spindle so as to be opened by a flowing water pressure from the inlet to the outlet, and the spindle rotates together with the check valve body. One end protrudes to the outside of the valve body, and the signal generating means detects a rotation angle of the protruding end of the spindle that rotates as the check valve body rotates. In the operating valve type running water detection device consisting of a sensor that emits a signal,
An arc-shaped protrusion projecting from the check valve body toward the inflow port, the arc-shaped protrusion is in an arc shape drawn around the rotation center of the check valve body, and the inner diameter of the valve seat A flowing water detection device characterized by being formed in a circular cross section having a slightly smaller diameter.

A flow control valve and a signal generating means, the flow control valve having a primary side inlet and a secondary side outlet, and a valve body having a valve chamber formed therebetween via a valve seat; The valve chamber has a check valve body pivotally supported around the spindle so as to be opened by a flowing water pressure from the inlet to the outlet, and the spindle rotates together with the check valve body. One end protrudes to the outside of the valve body, and the signal generating means detects a rotation angle of the protruding end of the spindle that rotates as the check valve body rotates. In the operating valve type running water detection device consisting of a sensor that emits a signal,
An arc-shaped cylindrical wall protrudes from the valve seat toward the outlet so as to surround the outer periphery of the check valve body, and the arc-shaped cylindrical wall is drawn in an arc shape centering on the rotation center of the check valve body In addition, the water flow detecting device is formed in a C-shaped cross section having an inner diameter slightly larger than a cross-sectional diameter of the check valve body.