JPH1124755A - Water supply plate controller - Google Patents
Water supply plate controllerInfo
- Publication number
- JPH1124755A JPH1124755A JP17596697A JP17596697A JPH1124755A JP H1124755 A JPH1124755 A JP H1124755A JP 17596697 A JP17596697 A JP 17596697A JP 17596697 A JP17596697 A JP 17596697A JP H1124755 A JPH1124755 A JP H1124755A
- Authority
- JP
- Japan
- Prior art keywords
- water
- water supply
- station
- flow rate
- control means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は給水所制御装置に係
り、特に、複数の給水所を一つの給水所のように見なし
て取り扱うことができる給水システムにおいて用いられ
る給水所制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water station control apparatus, and more particularly to a water station control apparatus used in a water supply system capable of treating a plurality of water stations as one water station. .
【０００２】[0002]
【従来の技術】図６は、従来技術及び本発明の適用対象
となる給水システムの構成を示す説明図である。この給
水システムは、第１の給水所Ａ及び第２の給水所Ｂの２
つの給水所を、需要家側から見れば恰も１つの給水所の
ように制御することができる給水システムである。2. Description of the Related Art FIG. 6 is an explanatory view showing the configuration of a water supply system to which the prior art and the present invention are applied. This water supply system is composed of a first water station A and a second water station B.
This is a water supply system that can control one water station as if it were a single water station from the viewpoint of the customer.
【０００３】図６において、本系統である浄水場１から
の浄水はポンプ２により、流量計４が設けられている配
管３に送出される。配管３は、配管５，６に分岐されて
おり、配管５は引入弁７を介して第１の給水所Ａにつな
がっており、また、配管６は流量計８及び引入弁９を介
して第２の給水所Ｂにつながっている。さらに、第１の
給水所Ａにはバイパス管１０が接続されており、このバ
イパス管１０はバイパス弁１１を介して配管６とつなが
っている。第１の給水所Ａには、流量計１２及び引入弁
１３が設けられている配管１４も接続されており、この
配管１４から他系統からの浄水を引き入れることができ
るようになっている。[0003] In FIG. 6, purified water from a water purification plant 1, which is the main system, is sent out by a pump 2 to a pipe 3 provided with a flow meter 4. The pipe 3 is branched into pipes 5 and 6, the pipe 5 is connected to a first water supply station A via an inlet valve 7, and the pipe 6 is connected to a first water station A via a flow meter 8 and an inlet valve 9. It is connected to the second water station B. Further, a bypass pipe 10 is connected to the first water supply station A, and the bypass pipe 10 is connected to the pipe 6 via a bypass valve 11. A pipe 14 provided with a flow meter 12 and an intake valve 13 is also connected to the first water supply station A, so that purified water from another system can be drawn in from the pipe 14.
【０００４】第１及び第２の給水所Ａ，Ｂには、それぞ
れの配水池の水位を計測するための水位計１５，１６が
設置されている。第１の給水所Ａ内の水は配水ポンプ１
７により、圧力計１８及び流量計１９が設けられている
配管２０に送出されるようになっており、また、第２の
給水所Ｂ内の水は配水ポンプ２１により、圧力計２２及
び流量計２３が設けられている配管２４に送出されるよ
うになっている。そして、配管２０及び配管２４からの
給水は配管２５により合流されて需要家側へ供給される
ようになっている。In the first and second water stations A and B, water level gauges 15 and 16 for measuring the water level of respective reservoirs are installed. The water in the first water station A is a water distribution pump 1
7, water is sent to a pipe 20 provided with a pressure gauge 18 and a flow meter 19, and water in the second water supply station B is supplied by a water distribution pump 21 to a pressure gauge 22 and a flow meter 19. It is sent to a pipe 24 provided with 23. The water supplied from the pipes 20 and 24 is joined by the pipe 25 and supplied to the customer side.
【０００５】次に、図６の給水システムにおける給水制
御につき説明する。この従来の給水制御は、作業員の手
動により行われるようになっている。まず、本系統から
のみ第１及び第２の給水所Ａ，Ｂに浄水が引き入れられ
る場合につき説明する。浄水場１の浄水はポンプ２によ
り配管３に送出され、引入弁７を通って第１の給水所Ａ
に引き入れられる。この時点では引入弁９及びバイパス
弁１１は閉じられており、浄水場１からの浄水は標高の
高い第１の給水所Ａにのみ引き入れられることになる。
そして、第１の給水所Ａ内の水は配水ポンプ１７により
配管２０に送出され、配管２５を通って、需要家側への
給水が行われる。Next, water supply control in the water supply system of FIG. 6 will be described. This conventional water supply control is performed manually by an operator. First, a case in which purified water is drawn into the first and second water stations A and B only from this system will be described. The purified water from the water purification plant 1 is sent out to the pipe 3 by the pump 2 and passes through the inlet valve 7 to the first water supply station A.
Drawn into. At this time, the intake valve 9 and the bypass valve 11 are closed, and the purified water from the water purification plant 1 is drawn only into the first water supply station A having a high altitude.
Then, the water in the first water supply station A is sent out to the pipe 20 by the water distribution pump 17, and is supplied to the customer side through the pipe 25.
【０００６】このような給水が行われているうちに、第
１の給水所Ａの水位が上限値に近づくと、作業員はバイ
パス弁１１及び引入弁９を開き、第１の給水所Ａ内の水
の一部を標高の低い第２の給水所Ｂに送出するようにす
る。そして、第２の給水所Ｂ内の水は配水ポンプ２１に
より配管２４に送出され、配管２０の給水と合流して、
配管２５から需要家側への給水が行われる。ここで、配
水ポンプ１７，２１の運転台数については、作業員が流
量計１９，２３によりそれぞれの配水量を監視しながら
決定しており、また、圧力計１８，２２を見ながら配水
ポンプ１７，２１の吐出圧力制御を行っている。When the water level of the first water supply station A approaches the upper limit value while such water supply is being performed, the worker opens the bypass valve 11 and the intake valve 9 and the first water supply station A Part of the water is sent to the second water station B at a lower altitude. Then, the water in the second water supply station B is sent out to the pipe 24 by the water distribution pump 21 and merges with the water supply in the pipe 20,
Water is supplied from the pipe 25 to the customer side. Here, the operating number of the water distribution pumps 17 and 21 is determined by the worker while monitoring the respective water distribution amounts by the flow meters 19 and 23, and the water distribution pumps 17 and 21 are watched while watching the pressure gauges 18 and 22. 21 is performed.
【０００７】また、他系統からのみ浄水が引き入れられ
る場合も上記と同様にして需要家側への給水が行われ
る。すなわち、引入弁１３を通って他系統からの浄水が
第１の給水所Ａに引き入れられる。この時点では引入弁
９及びバイパス弁１１は閉じられており、浄水場１から
の浄水は第１の給水所Ａにのみ引き入れられることにな
る。そして、第１の給水所Ａ内の水は配水ポンプ１７に
より配管２０に送出され、配管２５を通って、需要家側
への給水が行われる。[0007] When purified water is drawn in only from another system, water is supplied to the customer side in the same manner as described above. That is, purified water from another system is drawn into the first water supply station A through the inlet valve 13. At this time, the intake valve 9 and the bypass valve 11 are closed, and the purified water from the water purification plant 1 is drawn into only the first water supply station A. Then, the water in the first water supply station A is sent out to the pipe 20 by the water distribution pump 17, and is supplied to the customer side through the pipe 25.
【０００８】このような給水が行われているうちに、第
１の給水所Ａの水位が上限値に近づくと、作業員はバイ
パス弁１１及び引入弁９を開き、第１の給水所Ａ内の水
の一部を第２の給水所Ｂに送出するようにする。そし
て、第２の給水所Ｂ内の水は配水ポンプ２１により配管
２４に送出され、配管２０の給水と合流して、配管２５
から需要家側への給水が行われる。When the water level at the first water supply station A approaches the upper limit value while such water supply is being performed, the worker opens the bypass valve 11 and the inlet valve 9 and the first water supply station A A part of the water is sent to the second water supply station B. Then, the water in the second water supply station B is sent out to the pipe 24 by the water distribution pump 21, merges with the water supply in the pipe 20, and is connected to the pipe 25.
Water is supplied to the customer side from.
【０００９】[0009]
【発明が解決しようとする課題】しかし、上記した従来
の給水制御は、作業員の手動により行われていたため、
作業員に多大の労力を強いるばかりか次のような課題を
有するものであった。However, the above-mentioned conventional water supply control has been performed manually by an operator.
In addition to imposing a great deal of labor on the worker, it has the following problems.
【００１０】すなわち、本系統又は他系統からの浄水
は、まず最初に第１の給水所Ａのみに引き入れられ、第
１の給水所Ａの水位が上限値に接近した時点で初めて第
１の給水所Ａを経由して第２の給水所Ｂにも引き入れら
れる。したがって、第２の給水所Ｂに引き入れられる浄
水は、第１の給水所Ａに引き入れられる浄水に比べて、
浄水場を送出されてから経過した時間が長くなってお
り、その残留塩素濃度が第１の給水所Ａのものよりも著
しく低下したものとなっている。[0010] That is, the purified water from this system or another system is first drawn into only the first water supply station A, and the first water supply is performed only when the water level of the first water supply station A approaches the upper limit. It is drawn into the second water station B via the station A. Therefore, the purified water drawn into the second water station B is compared with the purified water drawn into the first water station A,
The time elapsed since being sent out of the water purification plant is longer, and the residual chlorine concentration is significantly lower than that of the first water supply station A.
【００１１】また、作業員は、配水ポンプ１７，２１に
対して吐出圧力制御を行っているが、第１の給水所Ａと
第２の給水所Ｂとの標高位置が吐出圧力制御を行う上で
無視し得ないほどに異なっている場合には、標高位置の
低い方のポンプからの配水を行うことができなくなるこ
とがある。つまり、作業員は、配水ポンプ１７，２１に
対し同じ目標値を与えて吐出圧力制御を行っているが、
第１及び第２の給水所Ａ，Ｂの標高差が大きき場合に
は、標高位置の低い方の配水ポンプにおいて、ポンプ出
側圧力と押込み圧力とがバランスしてしまい、流量がゼ
ロの状態すなわち無送水の状態が発生することがあっ
た。The worker controls the discharge pressure for the water distribution pumps 17 and 21. The elevation position of the first water supply point A and the second water supply point B controls the discharge pressure. If the difference is not negligible, water distribution from the pump at the lower altitude may not be performed. That is, the worker gives the same target value to the water distribution pumps 17 and 21 to control the discharge pressure.
In the case where the elevation difference between the first and second water stations A and B is large, the pump outlet pressure and the pushing pressure are balanced in the lower water distribution pump, and the flow rate is zero. That is, a state of no water transmission may occur.
【００１２】本発明は上記事情に鑑みてなされたもので
あり、給水制御の自動化を図ると共に、残留塩素濃度の
著しい低下を防ぎ、また、給水所間の標高差に起因する
無送水状態の発生を防ぐことが可能な給水所制御装置を
提供することを目的としている。The present invention has been made in view of the above circumstances, and aims to automate water supply control, prevent a remarkable decrease in residual chlorine concentration, and generate a non-water supply state due to an elevation difference between water supply stations. It is an object of the present invention to provide a water station control device capable of preventing the water supply.
【００１３】[0013]
【課題を解決するための手段】上記課題を解決するため
の手段として、請求項１記載の発明は、本系統又は他系
統からの浄水を引き入れることが可能な第１の給水所
と、前記本系統又は前記第１の給水所から浄水を引き入
れることが可能な第２の給水所と、を備え、前記第１及
び第２の給水所からの各給水を合流させて、これを需要
家側へ供給する給水システムにおいて、前記本系統から
のみ浄水を前記第１及び第２の給水所に引き入れる場合
に、標高の高い前記第１の給水所の引入弁を全開にする
と共に、前記本系統の検出引入れ流量及び前記第２の給
水所の検出引入れ流量、並びに前記第１及び第２の給水
所の各検出水位に基づいて、第１及び第２の給水所の各
水位を等しくする方向の目標値を求め、この目標値に従
って、前記第２の給水所の引入弁の開度制御を行う本系
統引入流量制御手段、を備えたことを特徴とする。Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a first water supply station capable of drawing purified water from the main system or another system, And a second water supply station capable of drawing purified water from the system or the first water supply station, and merging the respective water supplies from the first and second water supply stations and sending the combined water to the customer side In the water supply system for supplying, when pure water is drawn into the first and second water stations only from the main system, the intake valve of the first water station at a high altitude is fully opened, and the main system is detected. Based on the intake flow rate and the detected intake flow rate of the second water supply station, and the respective detected water levels of the first and second water supply stations, a direction in which the respective water levels of the first and second water supply stations are made equal. A target value is determined, and the second supply is determined according to the target value. This line pulling-flow control means for controlling the opening degree of the pulling-valve place, characterized by comprising a.
【００１４】請求項２記載の発明は、請求項１記載の発
明において、前記他系統からのみ浄水を前記第１及び第
２の給水所に引き入れる場合に、前記第１の給水所の引
入弁を全開にすると共に、前記第１及び第２の給水所の
各検出水位に基づいて、これらの水位の差が設定範囲と
なるように、前記第２の給水所の引入弁の開度制御を行
う他系統引入流量制御手段、を備えたことを特徴とす
る。According to a second aspect of the present invention, in the first aspect of the present invention, when the purified water is drawn into the first and second water stations only from the other system, the inlet valve of the first water station is operated. Opening control of the intake valve of the second water supply station is performed based on the detected water levels of the first and second water supply stations so that the difference between the water levels is within a set range, while being fully opened. Characterized in that it is provided with another system intake flow control means.
【００１５】請求項３記載の発明は、請求項１又は２記
載の発明において、前記第１及び第２の給水所のうちの
一方の配水ポンプの吐出流量を目標値に追従させるよう
に制御する吐出流量制御手段と、前記第１及び第２の給
水所のうちの他方の配水ポンプの吐出圧力を目標値に追
従させるように制御する吐出圧力制御手段と、前記吐出
流量制御手段及び前記吐出圧力制御手段の目標値に基づ
き、前記第１及び第２の給水所の配水ポンプの運転台数
を制御する配水ポンプ台数制御手段と、を備えたことを
特徴とする。According to a third aspect of the present invention, in the first or second aspect of the invention, the discharge flow rate of one of the first and second water supply pumps is controlled to follow a target value. Discharge flow control means, discharge pressure control means for controlling the discharge pressure of the other one of the first and second water supply pumps to follow a target value, discharge flow control means and discharge pressure And a control unit for controlling the number of water distribution pumps operated in the first and second water supply stations based on a target value of the control means.
【００１６】請求項４記載の発明は、請求項３記載の発
明において、前記吐出流量制御手段及び前記吐出圧力制
御手段のそれぞれの制御対象に係る給水所を、所定時間
毎に切り換える制御方法切換手段、を備えたことを特徴
とする。According to a fourth aspect of the present invention, in the third aspect of the invention, there is provided a control method switching means for switching a water supply station to be controlled by the discharge flow rate control means and the discharge pressure control means at predetermined time intervals. , Is provided.
【００１７】[0017]
【発明の実施の形態】以下、本発明の各実施形態を図１
乃至図５に基づき説明する。但し、図６の給水システム
に関する構成要素については同一符号を付して重複した
説明を省略する。また、以下の各実施形態では、第１の
給水所Ａの標高位置の方が第２の給水所Ｂの標高位置よ
りも高いものとする。そして、バイパス弁１１は常時全
閉状態であるものとし、したがって第１の給水所Ａ内の
水はバイパス管１０を経由しては第２の給水所Ｂに送出
されないものとする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIG.
5 through FIG. However, the constituent elements related to the water supply system in FIG. In the following embodiments, it is assumed that the elevation position of the first water station A is higher than the elevation position of the second water station B. The bypass valve 11 is always in a fully closed state, so that water in the first water supply station A is not sent out to the second water supply station B via the bypass pipe 10.
【００１８】図１は、本発明の第１の実施形態の要部構
成を示すブロック図である。第１の実施形態は、本系統
からのみ浄水を引き入れる場合に用いられるものであ
る。この図に示すように、この実施形態に係る給水所制
御装置は、引入制御装置５１を有しており、引入制御装
置５１は本系統引入流量制御手段５２を有している。本
系統引入流量制御手段５２は、流量計４，８及び水位計
１５，１６からの検出信号に基づいて引入弁７，９を制
御するようになっている。FIG. 1 is a block diagram showing a main configuration of a first embodiment of the present invention. The first embodiment is used when pure water is drawn only from this system. As shown in this figure, the water supply station control device according to this embodiment has an intake control device 51, and the intake control device 51 has a main system intake flow rate control means 52. The system inlet flow control means 52 controls the inlet valves 7 and 9 based on detection signals from the flow meters 4 and 8 and the water level meters 15 and 16.
【００１９】次に、図１の動作につき説明する。本系統
からの浄水を引き入れる場合、本系統引入流量制御手段
５２は、まず、引入弁７を全開状態にしておく。これ
は、もし、本系統引入流量制御手段５２が引入弁７，９
のそれぞれに対して開度を制御し流量制御を行うことと
すると、相互に干渉し合うことになるので、標高位置の
高い側の第１の給水所Ａの引入弁７を全開状態にしてお
くのが好ましいからである。Next, the operation of FIG. 1 will be described. When drawing in purified water from the main system, the main system inlet flow control means 52 first sets the inlet valve 7 to a fully open state. This is because if the system inlet flow control means 52 is operated by the inlet valves 7, 9
If the flow rate control is performed by controlling the opening degree for each of them, they will interfere with each other, so that the intake valve 7 of the first water supply station A on the higher elevation side is fully opened. Is preferred.
【００２０】次いで、浄水場１からの浄水がポンプ２に
より配管３に送出される。この浄水は流量計４を通った
後、配管５，６に分流し、引入弁７，９を通って第１の
給水所Ａ及び第２の給水所Ｂに引き入れられる。そし
て、本系統引入流量制御手段５２は、流量計４，８及び
水位計１５，１６からの各検出信号を入力して下式
（１）のＱ2SVを演算し、このＱ2SVを目標値として引入
弁９の開度制御を行う。Next, purified water from the water purification plant 1 is sent out to the pipe 3 by the pump 2. After passing through the flow meter 4, the purified water is diverted to the pipes 5 and 6, and drawn into the first water station A and the second water station B through the inlet valves 7 and 9. Then, the system incoming flow control means 52 inputs the respective detection signals from the flow meters 4, 8 and the water level meters 15, 16 to calculate Q 2 SV of the following equation (1), and use this Q 2 SV as a target value. The opening degree of the intake valve 9 is controlled.
【００２１】[0021]
【数１】 ここで、 ａ，ｋ：係数〔−〕 Ｑo：本系統からの引入れ流量〔m3/h〕 Ｑt：他系統からの引入れ流量〔m3/h〕 ｍ：配水池の数〔−〕 Ｑ2SV：第２の給水所Ｂの引入れ流量目標値〔m3/h〕 Ａ1，Ａ2：給水所Ａ，Ｂの配水池面積〔m2〕 ｈ1，ｈ2：給水所Ａ，Ｂの配水池水位〔m〕 である。(Equation 1) Here, a, k: coefficient [-] Q o: inlet flow from the grid [m 3 / h] Q t: inlet flow rate from another system [m 3 / h] m: Number of distribution reservoir [ −] Q2SV : Target intake flow rate at the second water station B [m 3 / h] A 1 , A 2 : Area of the reservoir at the water stations A and B [m 2 ] h 1 , h 2 : Water station A and B are reservoir water levels [m].
【００２２】但し、本実施形態では本系統からのみ浄水
を引き入れる場合を想定しているので、Ｑtの値はゼロ
であり、（１）式のａは、１／ｍ となる。そして、給
水所はＡ，Ｂの２個所であるから配水池数ｍの値は２と
なる。また、給水所Ａ，Ｂ間の配水池水位の差が大きく
なりすぎると、Ｑ2SVの値がＱoの値を超えてしまう場合
が考えられるので、（ａ・ｋ）の値に制限を付し、（ａ
・ｋ）＞１．０ となるときは、（ａ・ｋ）＝１．０
として演算を行うようにする。[0022] However, since in this embodiment it is assumed that draws water purification only from this line, the value of Q t is zero, (1) the a becomes 1 / m. Since there are two water stations, A and B, the value of the number m of the reservoirs is two. In addition, with water stations A, the difference between the distribution reservoir water level between the B becomes too large, so if the value of Q 2SV exceeds the value of Q o can be considered, a limit on the value of (a · k) Then (a
When (k)> 1.0, (a · k) = 1.0
Is calculated.
【００２３】上記の構成によれば、本系統から浄水を引
き入れる場合の各給水所への引入れ流量の制御を本系統
引入流量制御手段５２が自動的に行うので、作業員の労
力を軽減することができる。また、作業員の手動による
従来の給水制御では、本系統である浄水場１からの浄水
は、最初に第１の給水所Ａにのみ引き入れられ、第１の
給水所Ａの水位が上限値付近に達した時点で初めて、バ
イパス管１０を介して第２の給水所Ｂに引き入れられる
ようになっていたため、第２の給水所Ｂの残留塩素濃度
の著しい低下が問題となっていた。しかし、図１の構成
では、浄水場１からの浄水は、ポンプ２により配管３に
送出された後、配管５，６に分流されて第１及び第２の
給水所Ａ，Ｂへ同時に引き入れられるようになっている
ので、第２の給水所Ｂの残留塩素濃度が低下することは
ない。According to the above configuration, when the purified water is drawn in from the main system, the flow control unit 52 automatically controls the flow rate to be supplied to each water supply station, thereby reducing the labor of the operator. be able to. Further, in the conventional water supply control manually by an operator, the purified water from the water purification plant 1 which is the main system is initially drawn only into the first water supply station A, and the water level of the first water supply station A is near the upper limit. Only at the time when the water supply reached the second water supply station B through the bypass pipe 10, the residual chlorine concentration in the second water supply station B had a significant decrease. However, in the configuration of FIG. 1, the purified water from the water purification plant 1 is sent out to the pipe 3 by the pump 2, then diverted to the pipes 5 and 6, and simultaneously drawn into the first and second water stations A and B. As a result, the concentration of residual chlorine in the second water supply station B does not decrease.
【００２４】図２は、本発明の第２の実施形態の要部構
成を示すブロック図である。第２の実施形態は、本系統
又は他系統のいずれからでも浄水を引き入れることが可
能なものである。この図に示すように、この実施形態に
係る給水所制御装置は、引入制御装置５１Ａを有してお
り、引入制御装置５１Ａは本系統引入流量制御手段５２
及び他系統引入流量制御手段５３を有している。他系統
引入流量制御手段５３は、流量計１２，８及び水位計１
５，１６からの検出信号に基づいて引入弁１３，７，９
を制御するようになっている。但し、他系統から引き入
れる浄水の流量は他系統側で決定されているため、通
常、引入弁１３については全開又は所定の開度に固定さ
れている。なお、本系統引入流量制御手段５２の構成及
び動作は、図１の場合と同様であるため、その説明につ
いては省略する。FIG. 2 is a block diagram showing a configuration of a main part of a second embodiment of the present invention. In the second embodiment, purified water can be drawn in from either this system or another system. As shown in this figure, the water supply station control device according to this embodiment has an intake control device 51A, and the intake control device 51A is a main system intake flow control means 52.
And another system inlet flow control means 53. The other system inlet flow control means 53 includes the flow meters 12 and 8 and the water level meter 1.
Inlet valves 13, 7, 9 based on the detection signals from 5, 16
Is controlled. However, since the flow rate of the purified water to be drawn in from another system is determined on the other system side, usually, the drawing-in valve 13 is fixed to a full opening or a predetermined opening degree. Note that the configuration and operation of the system incoming flow control means 52 are the same as those in FIG. 1, and a description thereof will be omitted.
【００２５】次に、図２の動作につき説明する。他系統
からの浄水を引き入れる場合、他系統引入流量制御手段
５３は、まず、引入弁７を全開にしておく。これは、図
１で説明した給水所Ａ，Ｂの各流量制御による干渉を防
ぐためではなく、給水所Ａから給水所Ｂへの流路を確保
するためである。Next, the operation of FIG. 2 will be described. When drawing in purified water from another system, the other system inlet flow control means 53 first opens the inlet valve 7 fully. This is not to prevent interference due to each flow control of the water stations A and B described in FIG. 1 but to secure a flow path from the water station A to the water station B.
【００２６】次いで、他系統からの浄水は引入弁１３を
通り、配管１４を介して第１の給水所Ａに引き入れられ
る。そして、第１の給水所Ａ内の水は全開状態の引入弁
７を通り、さらに引入弁９を通って第２の給水所Ｂに引
き入れられる。他系統引入流量制御手段５３は、この引
入弁９の開度制御を行う。Next, purified water from another system passes through the inlet valve 13 and is drawn into the first water supply station A via the pipe 14. Then, the water in the first water supply station A passes through the intake valve 7 in a fully opened state, and is further drawn into the second water supply station B through the intake valve 9. The other system inlet flow control means 53 controls the opening of the inlet valve 9.
【００２７】この場合、他系統引入流量制御手段５３
は、第１の給水所Ａの配水池水位が第２の給水所Ｂの配
水池水位よりもＬ1〔m〕以上高くなった場合に引入弁９
を開いて第２の給水所Ｂへの引き入れを開始し、また、
第２の給水所Ｂの配水池水位が第１の給水所Ａの配水池
水位よりもＬ2〔m〕以上高くなった場合に引入弁９を閉
じて第２の給水所Ｂへの引き入れを終了させる。そし
て、他系統引入流量制御手段５３が引入弁９の開度制御
を行う場合の制御量は、他系統からの流量に応じて数段
階に設定されている。例えば、他系統からの流量が２０
００〔m3/h〕以上であれば３０度とし、１０００〔m3/
h〕以下であれば１０度とする。In this case, the other system inlet flow control means 53
When the water level of the reservoir at the first water station A is higher than the water level of the reservoir at the second water station B by L 1 [m] or more, the inlet valve 9
To start drawing into the second water station B,
When the water level of the reservoir at the second water station B becomes higher than the water level of the reservoir at the first water station A by L 2 [m] or more, the intake valve 9 is closed and the water is drawn into the second water station B. Terminate. The control amount when the other system intake flow control means 53 controls the opening degree of the intake valve 9 is set in several stages according to the flow from the other system. For example, if the flow rate from another system is 20
If it is more than 00 [m 3 / h], it is set to 30 degrees and 1000 [m 3 / h].
h] is less than 10 degrees.
【００２８】上記のように、他系統からのみ浄水を引き
入れる場合は、従来の給水制御と同様に、まず最初に第
１の給水所Ａのみに浄水が引き入れられ、その後に第１
の給水所Ａから第２の給水所Ｂに浄水が引き入れられる
ことになる。しかし、従来の制御の場合、第１の給水所
Ａから第２の給水所Ｂへの浄水引入れ開始時点は、第１
の給水所Ａの水位が上限値に接近した時点であったが、
上記第２の実施形態の場合、第２の第２の給水所Ｂへの
浄水引入れ開始時点は、第１の給水所Ａの水位が第２の
給水所Ｂの水位よりもＬ1〔m〕以上高くなった時点であ
る。したがって、このＬ1の値を適切に設定することに
より、第２の給水所Ｂの残留塩素濃度が第１の給水所Ａ
より著しく低下するのを防ぐことができる。As described above, when the purified water is introduced only from another system, the purified water is first introduced only to the first water supply station A, and then the first purified water is introduced, similarly to the conventional water supply control.
From the water supply station A to the second water supply station B. However, in the case of the conventional control, the point in time when the clean water introduction from the first water station A to the second water station B is started is the first water station.
Was at the point when the water level at water station A approached the upper limit.
In the case of the second embodiment, at the time of starting the introduction of purified water into the second second water station B, the water level of the first water station A is lower than the water level of the second water station B by L 1 [m ] It is the time when it became higher. Therefore, by setting the value of the L 1 appropriately, the residual chlorine concentration of the second water stations B are first water stations A
It can be prevented from lowering more remarkably.
【００２９】図３は、本発明の第３の実施形態の要部構
成を示すブロック図である。第３の実施形態は、第１の
給水所Ａと第２の給水所Ｂとの標高位置の違いに起因す
る無送水状態の発生を防止することを主眼とするもので
ある。この図に示すように、この実施形態に係る給水所
制御装置は、配水制御装置５４を有しており、配水制御
装置５４は吐出流量制御手段５５、吐出圧力制御手段５
６、及び配水ポンプ台数制御手段５７を有している。本
実施形態では、２つの給水所の配水ポンプのうち一方に
対して吐出圧力制御を行い、他方に対して吐出流量制御
を行うが、標高位置の高い方の給水所に対して吐出圧力
制御を行うのが好ましいので、吐出圧力制御手段５６の
制御対象を配水ポンプ１７とし、吐出流量制御手段５５
の制御対象を配水ポンプ２１とする。このように、他方
を吐出流量制御することにより、吐出圧力制御だけの場
合に生じた、標高差による無送水状態の発生を防止する
ことができる。FIG. 3 is a block diagram showing a main configuration of a third embodiment of the present invention. The third embodiment mainly aims to prevent the occurrence of a no water supply state due to a difference in altitude between the first water supply station A and the second water supply station B. As shown in this drawing, the water supply point control device according to this embodiment has a water distribution control device 54, and the water distribution control device 54 includes a discharge flow rate control unit 55, a discharge pressure control unit 5,
6 and means for controlling the number of water distribution pumps 57. In the present embodiment, the discharge pressure control is performed on one of the water distribution pumps at the two water supply stations, and the discharge flow rate control is performed on the other. It is preferable that the discharge pressure control means 56 be controlled by the water distribution pump 17 and the discharge flow rate control means 55 be controlled.
Is a water distribution pump 21. As described above, by controlling the discharge flow rate on the other side, it is possible to prevent the occurrence of the non-water-supplying state due to the difference in altitude, which occurs when only the discharge pressure control is performed.
【００３０】次に、図３の動作につき説明する。吐出流
量制御手段５５は、水位計１５，１６及び流量計２３か
らの各検出信号を入力して下式（２）のＱ4SVを演算
し、このＱ4SVを配水ポンプ台数制御手段５７に出力す
る。配水ポンプ台数制御手段５７は、この目標値Ｑ4SV
に追従するように配水ポンプ２１のＰＩＤ制御を行う。
この場合のＰＩＤ制御は、配水ポンプ２１の運転効率が
最も良くなるように、その運転台数を調整することによ
り行うことができ、また、配水ポンプ２１の回転数制御
によっても行うことができる。Next, the operation of FIG. 3 will be described. The discharge flow rate control means 55 receives each detection signal from the water level gauges 15, 16 and the flow meter 23, calculates Q 4 SV of the following equation (2), and outputs this Q 4 SV to the water distribution pump number control means 57. . The water distribution pump number control means 57 calculates the target value Q 4SV
PID control of the water distribution pump 21 is performed so as to follow.
The PID control in this case can be performed by adjusting the number of operating water distribution pumps 21 so that the operation efficiency of the water distribution pump 21 is the best, and can also be performed by controlling the rotation speed of the water distribution pump 21.
【００３１】[0031]
【数２】 ここで、 ｋ1，ｋ2：係数〔−〕 Ｑ5：配水流量（配管２５の流量）〔m3/h〕 Ｑ3SV：給水所Ａの吐出流量目標値〔m3/h〕 Ｑ4SV：給水所Ｂの吐出流量目標値〔m3/h〕 Ａ1，Ａ2：給水所Ａ，Ｂの配水池面積〔m2〕 ｈ1，ｈ2：給水所Ａ，Ｂの配水池水位〔m〕 α：係数（本実施形態では２）〔−〕 である。(Equation 2) Here, k 1 , k 2 : coefficient [−] Q 5 : water distribution flow rate (flow rate of pipe 25) [m 3 / h] Q 3SV : discharge flow target value of water supply station A [m 3 / h] Q 4SV : Discharge flow target value at water station B [m 3 / h] A 1 , A 2 : area of reservoirs at water stations A and B [m 2 ] h 1 , h 2 : water level at reservoirs A and B [m Α: Coefficient (2 in this embodiment) [−].
【００３２】但し、吐出流量制御を行う場合、配水流量
Ｑ5の値がある程度以上でないと、吐出圧力制御側では
吐出圧力を目標値に追従させることができなくなる。し
たがって、吐出流量制御を行うのは配水流量Ｑ5の値が
ある程度以上になった場合であるものとする。なお、吐
出流量制御手段５５は、（２）式に示すように、給水所
Ｂの吐出流量目標値Ｑ4SVの他に、給水所Ａの吐出流量
目標値Ｑ3SVについても演算を行っているが、これは第
４の実施形態において後述する制御方法切換の場合に対
処できるようにするためである。[0032] However, when performing the discharge flow rate control, the value of the distributed water flow Q 5 is less than a certain degree, can not be made to follow the discharge pressure to the target value in the discharge pressure control side. Therefore, it performs discharge flow rate control is assumed values of distributed water flow Q 5 is when it becomes more than a certain degree. Although the discharge flow control means 55 calculates the discharge flow target value Q 3SV of the water supply station A in addition to the discharge flow target value Q 4SV of the water supply station B as shown in the equation (2). This is to make it possible to cope with a control method switching described later in the fourth embodiment.
【００３３】また、給水所Ａ，Ｂ間の配水池水位の差が
一定以上大きくなると、吐出流量目標値の大きくなりす
ぎたり小さくなりすぎたりして、無送水状態が発生する
虞れがある。そこで、吐出流量目標値の演算を行うに際
しては、ｋ1及びｋ2の値に制限を付すようにしている。
例えば、ｋ1については、ｋ1＞0.7のときはｋ1=0.7と
し、ｋ1＜0.1のときはｋ1=0.1とする。ｋ2については、
ｋ2＞0.9のときはｋ2=0.9とし、ｋ2＜0.3のときはｋ2=
0.3とする。If the difference between the water levels of the reservoirs between the water stations A and B becomes larger than a certain value, the discharge flow target value may become too large or too small, and a non-water supply state may occur. Therefore, when calculating the discharge flow rate target value, the values of k 1 and k 2 are limited.
For example, k 1 is set to k 1 = 0.7 when k 1 > 0.7, and k 1 = 0.1 when k 1 <0.1. For k 2,
When k 2 > 0.9, k 2 = 0.9, and when k 2 <0.3, k 2 =
0.3.
【００３４】図４は、本発明の第４の実施形態の要部構
成を示すブロック図である。第４の実施形態は、各給水
所の配水ポンプに対し、吐出流量制御及び吐出圧力制御
の制御方法を切り換える機能を有するものである。冬季
など需要家側への配水流量が少ないシーズンにおいて、
実際には吐出圧力を行っている側の給水所からしか配水
が行われないことがある。そのため、吐出流量制御を行
っている側の給水所の残留塩素濃度が低下することにな
る。そこで、このような事態を回避するため、一定時間
経過毎に各給水所に対して制御方法の切換を行う必要が
ある。FIG. 4 is a block diagram showing a main configuration of a fourth embodiment of the present invention. The fourth embodiment has a function of switching a control method of discharge flow rate control and discharge pressure control for a water distribution pump at each water supply station. In the season when water distribution to the customer side is small, such as in winter,
Actually, water distribution may be performed only from the water supply station on the side that performs discharge pressure. For this reason, the residual chlorine concentration in the water supply station on the side where the discharge flow rate is controlled is reduced. Therefore, in order to avoid such a situation, it is necessary to switch the control method for each water supply station every predetermined time.
【００３５】図４に示すように、この実施形態に係る給
水所制御装置は、配水制御装置５４Ａを有しており、配
水制御装置５４Ａは、吐出流量制御手段５５、吐出圧力
制御手段５６、配水ポンプ台数制御手段５７の他に制御
方法切換制御手段５８を有している。図３の構成と異な
り、吐出流量制御手段５５は流量計１９，２３の双方か
ら検出信号を入力し、吐出圧力制御手段５６も圧力計１
８，２２の双方から検出信号を入力するようになってい
る。そして、制御方法切換制御手段５８は配水ポンプ台
数制御手段５７から配水ポンプ１７，２１に出力される
信号を一定時間経過毎に交互に切り換えるようになって
いる。As shown in FIG. 4, the water station control device according to this embodiment has a water distribution control device 54A. The water distribution control device 54A includes a discharge flow rate control means 55, a discharge pressure control means 56, In addition to the pump number control means 57, a control method switching control means 58 is provided. Unlike the configuration of FIG. 3, the discharge flow rate control means 55 receives a detection signal from both the flow meters 19 and 23, and the discharge pressure control means 56
The detection signals are input from both of the detectors 8 and 22. The control method switching control means 58 alternately switches the signals output from the water distribution pump number control means 57 to the water distribution pumps 17 and 21 every predetermined time.
【００３６】次に、図４の動作につき説明する。最初の
状態では、配水ポンプ２１が吐出流量制御手段５５によ
り吐出流量制御されるようになっており、配水ポンプ１
７が吐出圧力制御手段５６により吐出圧力制御されるよ
うになっている。いま、冬季であり、需要家側への配水
流量が少ないため、第１の給水所Ａからしか配水が行わ
れていないとすると、第２の給水所Ｂ内の残留塩素濃度
が次第に低下することとなる。しかし、制御方法切換制
御手段５８は、１日に１度配水ポンプが全台停止してい
る時間に、配水ポンプ台数制御手段５７の出力先を切り
換えるようにする。これにより、翌日は第１の給水所Ａ
の配水ポンプ１７に対して吐出流量制御が行われ、第２
の給水所Ｂの配水ポンプ２１に対して吐出圧力制御が行
われることになる。したがって、翌日には第２の給水所
Ｂからの配水を確実に行うことができる。このように、
給水所Ａ，Ｂ間で吐出流量制御と吐出圧力制御を１日毎
に切り換えることにより、両給水所の残留塩素濃度をほ
ぼ均一にすることができ、いずれか一方の残留塩素濃度
が他方に比べて極端に低下するのを防止することができ
る。Next, the operation of FIG. 4 will be described. In the initial state, the water distribution pump 21 is controlled to be discharged by the discharge flow control means 55.
7 is controlled by the discharge pressure control means 56 to control the discharge pressure. Now, it is winter, and the distribution of water to the customer side is small, so if water is distributed only from the first water station A, the residual chlorine concentration in the second water station B will gradually decrease. Becomes However, the control method switching control means 58 switches the output destination of the water distribution pump number control means 57 at a time when all the water distribution pumps are stopped once a day. Thus, the next day, the first water station A
The discharge flow rate is controlled for the water distribution pump 17 of the second
The discharge pressure control is performed on the water distribution pump 21 of the water supply station B. Therefore, water distribution from the second water supply station B can be reliably performed on the next day. in this way,
By switching the discharge flow rate control and the discharge pressure control between the water stations A and B every day, the residual chlorine concentration at both water stations can be made substantially uniform, and the residual chlorine concentration of one of the water stations is smaller than that of the other. Extreme reduction can be prevented.
【００３７】図５は、本発明の第５の実施形態の要部構
成を示すブロック図である。この図に示すように、この
実施形態に係る給水所制御装置は、引入制御装置５１Ａ
及び配水制御装置５４Ａを有しており、既述した第１乃
至第４の実施形態の構成要素を全て含んでいる。図５の
構成及び動作については、第１乃至第４の実施形態によ
り理解できるため、その説明についての記載を省略す
る。FIG. 5 is a block diagram showing a main configuration of a fifth embodiment of the present invention. As shown in this figure, the water supply station control device according to this embodiment includes an entrance control device 51A.
And a water distribution control device 54A, and includes all the components of the above-described first to fourth embodiments. Since the configuration and operation of FIG. 5 can be understood from the first to fourth embodiments, the description thereof will be omitted.
【００３８】なお、上記各実施形態では給水所の数が２
つの場合を例にとり説明したが、給水所の数は３つ以上
のすることが可能である。つまり、第１の給水所Ａを１
つ又は複数とし、第２の給水所についても１つ又は複数
とすることができる。In each of the above embodiments, the number of water stations is two.
Although the description has been made with respect to the two cases as an example, the number of water stations can be three or more. In other words, the first water station A is 1
One or more, and the second water supply station may be one or more.
【００３９】[0039]
【発明の効果】以上のように、本発明によれば、給水制
御の自動化を図ると共に、残留塩素濃度の著しい低下を
防ぎ、また、給水所間の標高差に起因する無送水状態の
発生を防ぐことが可能な給水所制御装置を実現すること
ができる。As described above, according to the present invention, the water supply control is automated, the remarkable decrease in the residual chlorine concentration is prevented, and the non-water supply state caused by the elevation difference between the water supply stations is prevented. A water station control device that can be prevented can be realized.
【図１】本発明の第１の実施形態の要部構成を示すブロ
ック図。FIG. 1 is a block diagram showing a configuration of a main part of a first embodiment of the present invention.
【図２】本発明の第２の実施形態の要部構成を示すブロ
ック図。FIG. 2 is a block diagram showing a configuration of a main part of a second embodiment of the present invention.
【図３】本発明の第３の実施形態の要部構成を示すブロ
ック図。FIG. 3 is a block diagram showing a configuration of a main part of a third embodiment of the present invention.
【図４】本発明の第４の実施形態の要部構成を示すブロ
ック図。FIG. 4 is a block diagram showing a configuration of a main part of a fourth embodiment of the present invention.
【図５】本発明の第５の実施形態の要部構成を示すブロ
ック図。FIG. 5 is a block diagram showing a configuration of a main part of a fifth embodiment of the present invention.
【図６】従来技術及び本発明の適用対象となる給水シス
テムの構成を示す説明図。FIG. 6 is an explanatory diagram showing a configuration of a water supply system to which the related art and the present invention are applied.
Ａ 第１の給水所 Ｂ 第２の給水所 １ 浄水場 ２ ポンプ ３ 配管 ４ 流量計 ５ 配管 ６ 配管 ７ 引入弁 ８ 流量計 ９ 引入弁 １０ バイパス管 １１ バイパス弁 １２ 流量計 １３ 引入弁 １４ 配管 １５ 水位計 １６ 水位計 １７ 配水ポンプ １８ 圧力計 １９ 流量計 ２０ 配管 ２１ 配水ポンプ ２２ 圧力計 ２３ 流量計 ２４ 配管 ２５ 配管 ５１ 引入制御装置 ５１Ａ 引入制御装置 ５２ 本系統引入流量制御手段 ５３ 他系統引入流量制御手段 ５４ 配水制御装置 ５４Ａ 配水制御装置 ５５ 吐出流量制御手段 ５６ 吐出圧力制御手段 ５７ 配水ポンプ台数制御手段 ５８ 制御方法切換制御手段 A first water station B second water station 1 water purification plant 2 pump 3 pipe 4 flow meter 5 pipe 6 pipe 7 inlet valve 8 flow meter 9 inlet valve 10 bypass pipe 11 bypass valve 12 flow meter 13 inlet valve 14 pipe 15 Water level gauge 16 Water level gauge 17 Water distribution pump 18 Pressure gauge 19 Flow meter 20 Piping 21 Water distribution pump 22 Pressure gauge 23 Flow meter 24 Piping 25 Piping 51 Inlet control device 51A Inlet control device 52 Main system incoming flow control means 53 Other system incoming flow control Means 54 Water distribution control device 54A Water distribution control device 55 Discharge flow rate control means 56 Discharge pressure control means 57 Number of water distribution pumps control means 58 Control method switching control means
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ０４Ｂ 49/06 ３２１ Ｆ０４Ｂ 49/06 ３２１Ｂ 49/08 ３２１ 49/08 ３２１ Ｇ０５Ｂ 11/18 Ｇ０５Ｂ 11/18 Ｄ 11/36 11/36 Ｎ Ｇ０５Ｄ 9/12 Ｇ０５Ｄ 9/12 Ａ (72)発明者 山 本 靖 雄 東京都府中市東芝町１番地 株式会社東芝 府中工場内──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI F04B 49/06 321 F04B 49/06 321B 49/08 321 49/08 321 G05B 11/18 G05B 11/18 D 11/36 11 / 36 NG05D 9/12 G05D 9/12 A (72) Inventor Yasuo Yamamoto 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu plant of Toshiba Corporation
Claims (4)
ことが可能な第１の給水所と、前記本系統又は前記第１
の給水所から浄水を引き入れることが可能な第２の給水
所と、を備え、前記第１及び第２の給水所からの各給水
を合流させて、これを需要家側へ供給する給水システム
において、 前記本系統からのみ浄水を前記第１及び第２の給水所に
引き入れる場合に、標高の高い前記第１の給水所の引入
弁を全開にすると共に、前記本系統の検出引入れ流量及
び前記第２の給水所の検出引入れ流量、並びに前記第１
及び第２の給水所の各検出水位に基づいて、第１及び第
２の吸水所の各水位を等しくする方向の目標値を求め、
この目標値に従って、前記第２の給水所の引入弁の開度
制御を行う本系統引入流量制御手段、 を備えたことを特徴とする給水所制御装置。A first water supply station capable of drawing purified water from the main system or another system;
And a second water supply station capable of drawing purified water from the water supply station of the above-mentioned water supply system, wherein the respective water supplies from the first and second water supply stations are combined and supplied to the customer side. When the purified water is drawn into the first and second water stations only from the main system, the intake valve of the first water station at a high altitude is fully opened, and the detected flow rate of the main system and The detected inlet flow rate of the second water supply station;
And a target value in a direction for equalizing each water level of the first and second water intake stations based on each detected water level of the second water supply station,
A water inlet control device for controlling the opening of an inlet valve of the second water inlet according to the target value.
引き入れる場合に、前記第１の給水所の引入弁を全開に
すると共に、前記第１及び第２の給水所の各検出水位に
基づいて、これら水位の差が設定範囲となるように、前
記第２の給水所の引入弁の開度制御を行う他系統引入流
量制御手段、 を備えたことを特徴とする給水所制御装置。2. The water supply station control device according to claim 1, wherein when the purified water is drawn into the first and second water stations only from the other system, the intake valve of the first water station is fully opened. At the same time, based on the detected water levels of the first and second water stations, the other system inlet flow rate controlling the opening of the inlet valve of the second water station so that the difference between the water levels is within a set range. Control means, comprising: a water station control device;
いて、 前記第１及び第２の給水所のうちの一方の配水ポンプの
吐出流量を目標値に追従させるように制御する吐出流量
制御手段と、 前記第１及び第２の給水所のうちの他方の配水ポンプの
吐出圧力を目標値に追従させるように制御する吐出圧力
制御手段と、 前記吐出流量制御手段及び前記吐出圧力制御手段の目標
値に基づき、前記第１及び第２の給水所の配水ポンプの
運転台数を制御する配水ポンプ台数制御手段と、 を備えたことを特徴とする給水所制御装置。3. The water supply point control device according to claim 1, wherein the discharge flow rate of one of the first and second water supply points is controlled so as to follow a target value. Means, discharge pressure control means for controlling the discharge pressure of the other water distribution pump of the first and second water supply stations to follow a target value, and the discharge flow rate control means and the discharge pressure control means A water supply pump control device for controlling the number of operating water distribution pumps at the first and second water supply stations based on a target value.
ぞれの制御対象に係る給水所を、所定時間毎に切り換え
る制御方法切換手段、 を備えたことを特徴とする給水所制御装置。4. The water supply station control device according to claim 3, further comprising control method switching means for switching a water supply station to be controlled by each of the discharge flow rate control means and the discharge pressure control means at predetermined time intervals. A water station control device, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17596697A JPH1124755A (en) | 1997-07-01 | 1997-07-01 | Water supply plate controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17596697A JPH1124755A (en) | 1997-07-01 | 1997-07-01 | Water supply plate controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1124755A true JPH1124755A (en) | 1999-01-29 |
Family
ID=16005377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17596697A Pending JPH1124755A (en) | 1997-07-01 | 1997-07-01 | Water supply plate controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1124755A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7435409B2 (en) | 1999-03-12 | 2008-10-14 | Mcneil-Ppc, Inc. | Compositions comprising a potassium salt active ingredient, including oral compositions for reducing dental nerve and dentin sensitivity comprising a non-menthol flavoring |
-
1997
- 1997-07-01 JP JP17596697A patent/JPH1124755A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7435409B2 (en) | 1999-03-12 | 2008-10-14 | Mcneil-Ppc, Inc. | Compositions comprising a potassium salt active ingredient, including oral compositions for reducing dental nerve and dentin sensitivity comprising a non-menthol flavoring |
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