JP3270287B2 - Variable speed water supply - Google Patents
Variable speed water supplyInfo
- Publication number
- JP3270287B2 JP3270287B2 JP07463995A JP7463995A JP3270287B2 JP 3270287 B2 JP3270287 B2 JP 3270287B2 JP 07463995 A JP07463995 A JP 07463995A JP 7463995 A JP7463995 A JP 7463995A JP 3270287 B2 JP3270287 B2 JP 3270287B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- inflow
- pump
- discharge
- control
- 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は可変速給水装置に係り、
特に配水管から加圧ポンプを介して直接末端給水機器へ
と連結された、いわゆる直結型の可変速給水装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed water supply device,
In particular, the present invention relates to a so-called direct connection type variable speed water supply device which is directly connected to a terminal water supply device from a water distribution pipe via a pressure pump.
【０００２】[0002]
【従来の技術】図１は、直結型可変速給水装置のシステ
ム概要を示す。例えば、水道の本管である配水管１１に
は流入管１２が接続され、加圧ポンプ１３がこの流入管
に接続されている。流入管１２には、量水器１５と流入
側圧力タンク１６とが接続されている。加圧ポンプ１３
の吐出側には、末端給水機器１７へと連結された吐出管
１８が接続されている。吐出管１８には、フロースイッ
チ１９、吐出側圧力タンク２０等が接続されている。加
圧ポンプ１３の流入側には流入圧力検出器２１が接続さ
れており、加圧ポンプ１３の流入側の圧力を検出し、そ
の信号を制御部２２に送る。同様に、加圧ポンプ１３の
吐出側には吐出圧力検出器２３が備えられ、吐出側圧力
信号を制御部２２に送る。2. Description of the Related Art FIG. 1 shows a system outline of a direct connection type variable speed water supply apparatus. For example, an inflow pipe 12 is connected to a water distribution pipe 11, which is a main pipe of water supply, and a pressurizing pump 13 is connected to the inflow pipe. A water meter 15 and an inflow-side pressure tank 16 are connected to the inflow pipe 12. Pressurizing pump 13
Is connected to a discharge pipe 18 connected to a terminal water supply device 17. The discharge pipe 18 is connected to a flow switch 19, a discharge side pressure tank 20, and the like. The inflow pressure detector 21 is connected to the inflow side of the pressure pump 13, detects the pressure on the inflow side of the pressure pump 13, and sends a signal to the control unit 22. Similarly, a discharge pressure detector 23 is provided on the discharge side of the pressure pump 13, and sends a discharge side pressure signal to the control unit 22.
【０００３】ポンプ１３は、三相２００Ｖの商用電源に
接続された周波数・電圧変換装置（インバータ）２５を
介して電動機により可変速で駆動される。制御部２２
は、流入圧力検出器２１及び吐出圧力検出器２３の信号
に基づき、可変速駆動手段２５に信号を送り、ポンプ１
３の回転数を任意の速度に加速又は減速制御する。The pump 13 is driven at a variable speed by an electric motor via a frequency / voltage converter (inverter) 25 connected to a three-phase 200 V commercial power supply. Control unit 22
Sends a signal to the variable speed driving means 25 based on signals from the inflow pressure detector 21 and the discharge pressure detector 23,
3 is controlled to accelerate or decelerate to an arbitrary speed.
【０００４】係る直結型の可変速給水装置においては、
従来の配水管に貯水槽を接続し、貯水槽に貯えられた水
を加圧ポンプを用いて末端給水機器へ分配するのと比較
して、種々のメリットがある。そのメリットは、貯水槽
を設けないため、給水装置を全体として小型化でき、又
設置面積を小さくできる。水が貯留されないので、衛生
上好ましい。配水管の水圧をそのまま加圧ポンプの吸込
側に利用できるため、加圧ポンプの揚程が低くなり、そ
の分省エネルギー化ができる等である。In such a direct connection type variable speed water supply device,
There are various merits as compared with connecting a water storage tank to a conventional water distribution pipe and distributing the water stored in the water storage tank to the terminal water supply equipment using a pressure pump. The advantage is that since no water storage tank is provided, the size of the water supply device can be reduced as a whole, and the installation area can be reduced. Since water is not stored, it is hygienic. Since the water pressure of the water distribution pipe can be used as it is on the suction side of the pressure pump, the head of the pressure pump is reduced, and energy can be saved accordingly.
【０００５】しかしながら、係る給水装置は配水管に直
接接続されているため、配水管側の水圧が低下した場合
に、加圧ポンプにより大量の水を吸い上げると、配水管
の水圧に悪影響を及ぼす等の問題が懸念される。However, since such a water supply device is directly connected to the water distribution pipe, if a large amount of water is sucked up by the pressurized pump when the water pressure on the water distribution pipe side drops, the water pressure in the water distribution pipe is adversely affected. Is a concern.
【０００６】特開平５−２６３４４４号公報には、配水
管に直結しながら、配水管側の水圧に悪影響を与えない
ように工夫された可変速給水装置が開示されている。こ
の公報に開示された可変速給水装置の制御フローを図７
に示す。まず、流入側圧力センサ２１により流入圧力Ｐ
S を読み込む。そして、流入圧力ＰS が所定の設定値Ｐ
2 よりも大きいか小さいかを比較する。小さい場合（Ｙ
ＥＳの場合）には、流入圧力ＰS を流入側の水圧が所定
の下限値を下回らないようにポンプの回転速度を制御す
る流入圧力制御を行う。この制御により、流入圧力ＰS
が所定の下限値より下回らないように制御される。ま
た、流入圧力ＰS が設定圧力Ｐ2 よりも大きな場合に
は、吐出圧力制御を行い、末端給水機器へ所定の圧力が
供給されるように、吐出圧力Ｐd となるように制御す
る。従って、吐出圧力制御が行なわれている場合には、
流入側の圧力いかんに関わらず、末端給水機器への供給
圧がほぼ一定の目標値に制御される。Japanese Patent Application Laid-Open No. Hei 5-263444 discloses a variable speed water supply device which is directly connected to a water distribution pipe and is designed so as not to adversely affect the water pressure on the water distribution pipe side. FIG. 7 shows a control flow of the variable speed water supply device disclosed in this publication.
Shown in First, the inflow pressure P is detected by the inflow pressure sensor 21.
Read S. The inlet pressure P S is a predetermined set value P
Two Compare greater than or less than. If small (Y
In the case of ES) performs inflow pressure control the inflow pressure P S water pressure on the inflow side controls the rotational speed of the pump so as not to fall below a predetermined lower limit value. With this control, the inflow pressure P S
Is controlled not to fall below a predetermined lower limit. Further, when the inflow pressure P S is greater than the set pressure P2 performs discharge pressure control, as a predetermined pressure to the end the water supply device is supplied is controlled so that the discharge pressure P d. Therefore, when the discharge pressure control is performed,
Regardless of the pressure on the inflow side, the supply pressure to the terminal water supply equipment is controlled to a substantially constant target value.
【０００７】[0007]
【発明が解決しようとする課題】図８は、上述した制御
方法により制御された流入圧力ＰS の一例を示すグラフ
である。流入圧力ＰS が設定圧力Ｐ2 よりも高い場合に
は、上述したように吐出圧力制御が行われ、末端側給水
機器へ所定の圧力に加圧された水が供給される。しかし
ながら、何らかの原因で配水管１１の水圧が低下した場
合には、流入圧力ＰS は、設定圧力Ｐ2 よりも下がるこ
とになり、この場合には流入圧力制御が行われる。そし
て、流入圧力制御は、その制御目標値が設定圧力Ｐ2 よ
りも低い、目標下限流入圧（設定圧力Ｐ3 ）を下回らな
いように制御されるため、配水管１１の水圧が上昇して
も図示するように流入圧力ＰS がなかなか設定圧力Ｐ2
のレベルに戻らず、吐出圧力制御に戻るのに長時間を要
するという問題がある。このため、末端給水機器側では
吐出圧力制御がある程度の時間行われなくなるため、末
端での水圧が低下し、不便を生じる時間が長くなる。8 [SUMMARY OF THE INVENTION] is a graph showing an example of the inflow pressure P S which is controlled by the control method described above. If the inflow pressure P S is higher than the set pressure P2 is carried out the discharge pressure control as described above, pressurized to a predetermined pressure to the distal side water supply equipment water is supplied. However, when the water pressure in the water pipe 11 for some reason has dropped, flows into the pressure P S is made to fall below the set pressure P2, flows pressure control is performed in this case. The inflow pressure control is controlled so that the control target value does not fall below a target lower limit inflow pressure (set pressure P3) lower than the set pressure P2. inflow so that the pressure P S is hard to set pressure P2
However, there is a problem that it takes a long time to return to the discharge pressure control without returning to the above level. For this reason, since the discharge pressure control is not performed for a certain amount of time on the terminal water supply device side, the water pressure at the terminal decreases, and the time during which inconvenience occurs becomes longer.
【０００８】本発明は上述した事情に鑑みて為されたも
ので、直結型の可変速給水装置であって、その流入側圧
力が低下した場合にも迅速に流入圧力制御から吐出圧力
制御に移行することができる可変速給水装置を提供する
ことを目的とする。The present invention has been made in view of the above-mentioned circumstances, and is a direct connection type variable speed water supply apparatus. Even when the pressure on the inflow side is reduced, the control is quickly shifted from the inflow pressure control to the discharge pressure control. It is an object of the present invention to provide a variable speed water supply device capable of performing the above-mentioned operations.
【０００９】[0009]
【課題を解決するための手段】本発明の可変速給水装置
は、配水管に接続された流入管と、この流入管に接続さ
れた加圧ポンプと、この加圧ポンプの吐出側に接続され
末端給水機器へと連結された吐出管と、前記流入管に設
けられた加圧ポンプの流入圧力を検出する流入圧力検出
器と、前記吐出管に設けられた加圧ポンプの吐出圧力を
検出する吐出圧力検出器と、前記加圧ポンプを可変速駆
動する可変速駆動手段と、前記ポンプを制御する制御手
段とを備え、該制御手段は、ポンプ吐出圧力があらかじ
め定められた吐出設定圧力になるように、吐出圧力が吐
出設定圧力よりも高い時はポンプ速度を下げ、吐出圧力
が吐出設定圧力よりも低い時はポンプ速度を上げて前記
ポンプの速度を制御する吐出圧力制御手段と、ポンプ流
入圧力があらかじめ定められた流入設定圧力になるよう
に、ポンプの流入圧力が流入設定圧力よりも高い時はポ
ンプ速度を上げ、ポンプの流入圧力が流入設定圧力より
も低い時はポンプ速度を下げて前記ポンプの速度を制御
する流入圧力制御手段とを備え、前記流入設定圧力より
も若干低くあらかじめ定められた前記吐出圧力制御手段
と前記流入圧力制御手段の切換を行う選択設定圧力とを
有し、流入圧力が該選択設定圧力よりも高い時は前記吐
出圧力制御を行い、流入圧力が該選択設定圧力よりも低
い時は前記流入圧力制御を実行することを特徴とする。SUMMARY OF THE INVENTION A variable speed water supply device according to the present invention is connected to an inflow pipe connected to a water distribution pipe, a pressurized pump connected to the inflow pipe, and connected to a discharge side of the pressurized pump. A discharge pipe connected to a terminal water supply device, an inflow pressure detector for detecting an inflow pressure of a pressurization pump provided in the inflow pipe, and a discharge pressure of a pressurization pump provided in the discharge pipe. A discharge pressure detector, a variable speed driving means for driving the pressure pump at a variable speed, and a control means for controlling the pump, wherein the control means makes the pump discharge pressure a predetermined discharge set pressure. As described above, when the discharge pressure is higher than the set discharge pressure, the pump speed is decreased, and when the discharge pressure is lower than the set discharge pressure, the pump speed is increased to control the speed of the pump. Pressure When the inflow pressure of the pump is higher than the inflow set pressure, the pump speed is increased, and when the inflow pressure of the pump is lower than the inflow set pressure, the pump speed is reduced so that the set inflow pressure is the specified inflow pressure. An inflow pressure control means for controlling the speed, comprising a predetermined discharge pressure control means slightly lower than the inflow set pressure and a selected set pressure for switching the inflow pressure control means, wherein the inflow pressure is The discharge pressure control is performed when the pressure is higher than the selected set pressure, and the inflow pressure control is performed when the inflow pressure is lower than the selected set pressure.
【００１０】[0010]
【作用】流入圧力制御に入った場合に、流入圧力ＰS が
目標設定圧力Ｐ2 となるようにポンプ速度を加減速し、
流入目標圧力よりも若干低く、吐出圧力制御と流入圧力
制御の選択を行う、選択設定圧力Ｐ3 を設定している。
このため、加圧ポンプが流入側の目標圧力Ｐ2 となるよ
うにポンプ速度が低下するので、迅速に吐出圧力制御と
流入圧力制御の選択設定圧力Ｐ3 を越えることができ、
流入圧力制御からすぐに吐出圧力制御に移行することが
できる。このため、末端給水機器側における水圧も、す
ばやく所定の圧力に戻すことができる。[Action] When entering the inlet pressure control, Hayashi inflow pressure P S is adjusting the pump speed so that the target set pressure P2,
A selection set pressure P3 is set slightly lower than the inflow target pressure and is used to select between the discharge pressure control and the inflow pressure control.
As a result, the pump speed is reduced so that the pressure of the pressurizing pump becomes the target pressure P2 on the inflow side, so that it is possible to quickly exceed the selected set pressure P3 of the discharge pressure control and the inflow pressure control,
It is possible to immediately shift from the inflow pressure control to the discharge pressure control. For this reason, the water pressure on the terminal water supply device side can also be quickly returned to the predetermined pressure.
【００１１】本来、可変速給水装置は、吐出圧力制御を
行い、末端給水機器に所定の水圧を供給するものであ
り、流入圧力制御は、直結に伴う配水管側の保護の目的
が強い。従って、なるべく流入圧力制御の状態を短くし
て、流入圧力の低下の原因が除去されたならば、速やか
に吐出圧力制御に戻す必要がある。図７に示す従来技術
の制御のフローでは、流入圧力制御の目標値（設定圧力
Ｐ2 ）が吐出制御／流入制御の選択圧力と同一の設定値
を用いていたため、流入圧力制御を抜け出すのに時間が
必要であった。なぜなら、設定圧力Ｐ2 に向かってＰＩ
制御（比例積分制御）を行うと、流入圧力ＰS が設定圧
力Ｐ2 に近づくに従って減速値が小さくなるため、目標
圧力値Ｐ2 になかなか近づかなくなる。このため、流入
圧力制御から吐出圧力制御に切り換わるのに長時間が必
要であった。Originally, the variable speed water supply device controls the discharge pressure and supplies a predetermined water pressure to the terminal water supply device. The inflow pressure control has a strong purpose of protecting the water distribution pipe side accompanying the direct connection. Therefore, it is necessary to shorten the state of the inflow pressure control as much as possible, and to return to the discharge pressure control as soon as the cause of the decrease in the inflow pressure is eliminated. In the control flow of the prior art shown in FIG. 7, since the target value (set pressure P2) of the inflow pressure control uses the same set value as the selected pressure of the discharge control / inflow control, it takes time to exit the inflow pressure control. Was needed. Because PI toward set pressure P2
When performing control (proportional integral control), because the deceleration value in accordance with the inflow pressure P S approaches the set pressure P2 is reduced, not approach easily the target pressure value P2. Therefore, it took a long time to switch from the inflow pressure control to the discharge pressure control.
【００１２】[0012]
【実施例】以下、本発明の一実施例について図１乃至図
６を参照しながら説明する。尚、各図中同一符号は同一
又は相当部分を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the drawings, the same reference numerals indicate the same or corresponding parts.
【００１３】本実施例においても、配水管１１に加圧ポ
ンプ１３が直結され、末端給水機器１７に給水するシス
テム構成は図１に示すとおりである。本実施例において
も、加圧ポンプ１３は吐出圧力検出器２３の信号によ
り、末端給水機器１７への供給水圧が一定となるように
可変速駆動手段２５でポンプ回転速度を増減する吐出圧
力制御が行われる。また、流入圧力が低下した場合に、
配水管に悪影響を及ぼさないように、一定の流入設定圧
力になるように、可変速駆動手段２５でポンプ回転速度
を増減する流入圧力制御が行われる。そして、吐出圧力
制御は流入圧力ＰS が選択設定圧力以下になった時に流
入圧力制御に切り換えられる。Also in this embodiment, the system configuration in which the pressure pump 13 is directly connected to the water distribution pipe 11 and supplies water to the terminal water supply equipment 17 is as shown in FIG. Also in the present embodiment, the discharge pressure control for increasing / decreasing the pump rotation speed by the variable speed drive means 25 so that the supply water pressure to the terminal water supply device 17 is kept constant by the signal of the discharge pressure detector 23 is performed by the pressurizing pump 13. Done. Also, when the inflow pressure drops,
The inflow pressure control for increasing or decreasing the pump rotation speed by the variable speed driving means 25 is performed so that the inflow pressure is kept constant so as not to adversely affect the water distribution pipe. Then, the discharge pressure control is switched to flow into the pressure control when the inflow pressure P S is equal to or less than the selected set pressure.
【００１４】図２は、本発明の一実施例の給水可変装置
の制御部分の構成を示す。制御部２２には、流入圧力検
出器２１から加圧ポンプ１３の流入側の圧力ＰS が入力
され、吐出圧力検出器２３から加圧ポンプ１３の吐出側
の圧力Ｐd が入力される。設定圧力Ｐ1 は、吐出圧力の
制御目標値であり、通常２〜３ｋｇ／ｃｍ2 に設定され
る。設定圧力Ｐ2 は、流入圧力ＰS の制御目標値であ
り、この目標設定圧力は、配水管に悪影響を及ぼさない
ように、通常１ｋｇ／ｃｍ2 程度に設定される。設定圧
力Ｐ3 は、流入圧力制御と吐出圧力制御の選択用の設定
圧力値であり、流入圧力検出器の流入圧力ＰS が設定圧
力Ｐ2 よりも若干低い値になった時に切替えられるよう
に設定される。本実施例においては、ほんの僅か０．０
５ｋｇ／ｃｍ2 程度設定圧力Ｐ2 よりも低い値に設定さ
れる。制御部２２は、流入圧力ＰS、吐出圧力Ｐd 、の
値に応じて、ポンプ１３を加速または減速する速度指令
を可変速駆動手段（インバータ）２５に与える。FIG. 2 shows a configuration of a control section of the variable water supply apparatus according to one embodiment of the present invention. The control unit 22, the pressure P S in the inlet side of the inlet pressure detector 21 pressure pump 13 is input, the pressure P d of the discharge side of the discharge pressure detector 23 pressure pump 13 is input. The set pressure P1 is a control target value of the discharge pressure, and is usually set to 2 to 3 kg / cm 2 . Set pressure P2 is a control target value of the inflow pressure P S, the target set pressure, so as not to adversely affect the water pipe, is set to usually about 1 kg / cm 2. Set pressure P3 is set pressure value for selecting the discharge pressure control the inflow pressure control, is set to be switched when it is slightly lower than the inflow pressure P S of the inlet pressure detector set pressure P2 You. In this example, only 0.0
The pressure is set to a value lower than the set pressure P2 by about 5 kg / cm 2 . The control unit 22 gives a speed command for accelerating or decelerating the pump 13 to the variable speed driving means (inverter) 25 according to the values of the inflow pressure P S and the discharge pressure P d .
【００１５】図３は、吐出圧力制御のフローを示す。吐
出圧力検出器２３よりポンプ１３の吐出側の吐出圧力Ｐ
d を読み込み、設定圧力Ｐ1 と比較する。吐出圧力Ｐd
が設定圧力Ｐ1 よりも高い場合には、ポンプ速度を下げ
る減速指令を出し、ポンプの揚程を下げることにより、
吐出圧力Ｐd を目標値である設定圧力Ｐ1 に近づけるよ
うにする。また、吐出圧力検出器２３で検出された吐出
圧力Ｐd が目標値である設定圧力Ｐ1 よりも低い場合に
は、ポンプ速度を上げる増速指令を出し、可変速駆動手
段２５によりポンプ１３を増速し、吐出圧力Ｐd を目標
値である設定圧力Ｐ1 に近づける。FIG. 3 shows a flow of the discharge pressure control. The discharge pressure P on the discharge side of the pump 13 from the discharge pressure detector 23
d is read and compared with the set pressure P1. Discharge pressure P d
When the pressure is higher than the set pressure P1, a deceleration command to reduce the pump speed is issued and the head of the pump is reduced,
The discharge pressure P d to be closer to the set pressure P1 which is the target value. Further, when the discharge pressure P d detected by the discharge pressure detector 23 is lower than the set pressure P1 which is the target value, issues a speed increase instruction to increase the pump speed, increasing the pump 13 by the variable speed drive means 25 Hayashi, close the discharge pressure P d the set pressure P1 which is the target value.
【００１６】図４は、流入圧力制御のフローを示す。流
入圧力検出器により加圧ポンプ１３の流入側の圧力ＰS
を読み込む。そして、設定圧力Ｐ2 と比較する。流入圧
力ＰS が設定圧力Ｐ2 よりも低い場合には、ポンプ速度
を下げる指令を出し、可変速駆動手段（インバータ）２
５によりポンプの回転速度を下げ、流入圧力ＰS の上昇
を待ち、所定の目標設定圧力Ｐ2 に近づけるようにす
る。また、流入圧力ＰSが、設定圧力Ｐ2 よりも大きい
場合には、ポンプ速度を上げる増速指令を出し、可変速
駆動手段（インバータ）２５によりポンプの回転速度を
上げて、目標設定流入圧力Ｐ2 に近づけるようにする。FIG. 4 shows a flow of the inflow pressure control. The pressure P S in the inlet side of the pressure pump 13 by flowing pressure detector
Read. Then, the pressure is compared with the set pressure P2. If the inflow pressure P S is lower than the set pressure P2 issues a command to lower the pump speed, the variable speed drive means (inverter) 2
The pump rotation speed is reduced by 5 to wait for an increase in the inflow pressure P S , so as to approach a predetermined target set pressure P 2. Further, the inflow pressure P S is greater than the set pressure P2 issues a speed increase instruction to increase the pump speed, by increasing the rotational speed of the pump by variable speed drive means (inverter) 25, a target set inlet pressure P2 To be close to
【００１７】図５は、上述した吐出圧力制御と流入圧力
制御の選択に関するフローを示す。まず、流入圧力検出
器２１により流入圧力ＰS を読み込む。そして、流入圧
力ＰS が設定圧力Ｐ3 よりも大きいか小さいかを比較す
る。流入圧力ＰS が設定圧力Ｐ3 より大きい場合には、
流入圧力が配水管１１に影響を及ぼすことはないと考え
られるので、本来の動作である図３のフローに示す吐出
圧力制御を行う。流入圧力ＰS が設定圧力Ｐ3 より低い
場合には、配水管１１の水圧に影響を及ぼす可能性があ
るので、図４のフローに示す流入圧力制御を行う。FIG. 5 shows a flow relating to the selection between the discharge pressure control and the inflow pressure control described above. First reads the inflow pressure P S by the inflow pressure detector 21. Then, be compared for inflow pressure P S is less than or greater than the set pressure P3. If the inflow pressure P S is larger than the set pressure P3 is
Since it is considered that the inflow pressure does not affect the water distribution pipe 11, the discharge pressure control shown in the flow of FIG. 3, which is the original operation, is performed. If the inflow pressure P S is lower than the set pressure P3, because can affect the pressure of the water pipe 11, and the inflow pressure control shown in the flowchart of FIG.
【００１８】図６は、本発明の一実施例の可変速給水装
置による流入圧力ＰSの制御結果の一例を示す。流入圧
力ＰS が正常の設定圧力Ｐ3 以上である場合には、本来
の可変速給水装置の動作である吐出圧力制御が行われ、
加圧ポンプ１３の吐出側は設定圧力Ｐ1 の目標値になる
ようにポンプの回転速度が増減され、末端給水機器に略
一定の水圧が得られるように制御される。FIG. 6 shows an example of the result of controlling the inflow pressure P S by the variable speed water supply device according to one embodiment of the present invention. If the inflow pressure P S is the set pressure P3 or more correctly, the discharge pressure control the operation of the original variable speed water supply apparatus are performed,
On the discharge side of the pressurizing pump 13, the rotation speed of the pump is increased or decreased so as to reach the target value of the set pressure P1, and control is performed so that a substantially constant water pressure is obtained in the terminal water supply equipment.
【００１９】ところが、何らかの事情で、例えば配水管
１１の水圧が低下することにより、ポンプ１３の流入側
の圧力が低下した場合には、流入圧力ＰS が設定圧力Ｐ
3 以下に低下すると流入圧力制御に切り換わる。そして
流入圧力制御の目標圧力は設定圧力Ｐ2 であり、選択の
ための設定圧力Ｐ3 よりもほんの僅かだけ高い。従っ
て、流入圧力制御に切り換わると、制御部２２は可変速
駆動手段（インバータ）２５にポンプの減速指令を出
し、流入圧力ＰS を高くするように制御する。この際の
制御目標値は、設定圧力Ｐ2 であるため、それよりも低
い吐出圧力制御と流入圧力制御の選択用の設定圧力Ｐ3
を容易に越えることができる。流入圧力ＰSが設定圧力
Ｐ3 を越えると、ポンプは本来の動作である吐出圧力制
御に戻る。[0019] However, for some reason, for example, by the water pressure of the water pipe 11 is reduced, when the pressure in the inlet side of the pump 13 is decreased, the inflow pressure P S is the set pressure P
When the pressure drops below 3, it switches to the inlet pressure control. The target pressure for the inflow pressure control is the set pressure P2, which is only slightly higher than the set pressure P3 for selection. Accordingly, when switched to the inflow pressure control, the control unit 22 to the variable speed drive means (inverter) 25 issues a deceleration command of the pump is controlled so as to increase the inflow pressure P S. Since the control target value at this time is the set pressure P2, the set pressure P3 for selecting the discharge pressure control and the inflow pressure control that are lower than the set pressure P3 is set.
Can be easily exceeded. When inlet pressure P S exceeds the set pressure P3, the pump returns to the discharge pressure control as the original operation.
【００２０】図８に示す従来の制御例では、本実施例に
おける設定圧力Ｐ2 と設定圧力Ｐ3が同じ値であったと
考えられる。流入圧力制御で設定圧力Ｐ２を目標に比例
積分（ＰＩ）制御すると、ポンプ速度指令は流入圧力Ｐ
S を設定目標圧力Ｐ2 になるように動作する。従って、
設定圧力Ｐ2 と流入圧力ＰS との偏差が小さくなると、
流入圧力ＰS が設定圧力Ｐ2 を越えてオーバーシュート
しないように速度の偏差も小さくなる。理想的に流入圧
力ＰS が、設定圧力Ｐ2 と等しい値となった場合には、
流入圧力ＰS が設定圧力Ｐ2 を越えないので、いつまで
たっても吐出圧力制御に移らないという問題点があっ
た。In the conventional control example shown in FIG. 8, it is considered that the set pressure P2 and the set pressure P3 in this embodiment have the same value. When proportional integral (PI) control is performed with the set pressure P2 as a target in the inflow pressure control, the pump speed command becomes
It operates so that S becomes the set target pressure P2. Therefore,
If the deviation between the set pressure P2 and the inlet pressure P S is reduced,
Speed deviations as inflow pressure P S is not overshoot beyond the set pressure P2 is also reduced. If the ideal inlet pressure P S has become equal to the set pressure P2 is
Since the inflow pressure P S does not exceed the set pressure P2, there is a problem that when not move to the discharge pressure control even after up to.
【００２１】本実施例では、流入圧力制御と吐出圧力制
御の切り換えを設定圧力Ｐ2 とは別個の設定圧力Ｐ3 で
判断している。選択のための設定圧力Ｐ3 を流入圧力制
御の目標値である設定圧力Ｐ2 よりも低く設定しておけ
ば、流入圧力制御に切り換えられたときに、設定圧力Ｐ
2 を目標に制御動作することとなり、ポンプ１３の流入
側圧力ＰS が設定圧力Ｐ2 に近づいた状態では、設定圧
力Ｐ3 を確実にクリアすることになり、短時間で本来の
制御である吐出圧力制御に切り換えることができる。In this embodiment, the switching between the inflow pressure control and the discharge pressure control is determined by the set pressure P3 which is different from the set pressure P2. If the set pressure P3 for selection is set lower than the set pressure P2 which is the target value of the inflow pressure control, the set pressure P3 is switched when the flow is switched to the inflow pressure control.
Becomes possible to control operation 2 to the target discharge pressure in the state where the inflow side pressure P S of the pump 13 is close to the set pressure P2, it will be definitely clear set pressure P3, which is short in the original control Can be switched to control.
【００２２】尚、図４に示す流入圧力制御において、流
入圧力ＰS が流入設定圧力Ｐ2 よりも高い時には、ポン
プを増速動作させているが、その時には既に吐出圧力制
御に切換り、増速運転は必要ないように思われる。しか
しながら、吐出圧力制御と流入圧力制御の選択設定圧力
Ｐ3 を流入圧力ＰS が上回っても、制御を切り換えるま
でに制御上の時間が存在することが考えられる。また、
流入圧力制御と吐出圧力制御が頻繁に切り換わらないよ
うに選択設定圧力Ｐ3 を流入圧力ＰS が上回った後にタ
イマー等で一定微小時間（３秒程度）切り換えを遅延す
る場合もある。そのような場合に流入設定圧力Ｐ2 より
も流入圧力ＰS が高い時に、流入圧力制御においてポン
プを増速動作または、減速していた場合は速度を固定す
る等の制御動作をする必要が出てくる。[0022] Incidentally, in the inflow pressure control shown in FIG. 4, when the inlet pressure P S is higher than the inflow set pressure P2, although by accelerating operating the pump, Setsu換Ri already discharge pressure control when the speed increasing Driving does not seem necessary. However, even higher than the selected set pressure P3 in the discharge pressure control the inflow pressure control inlet pressure P S is, it is considered that there is a time in control until switching control. Also,
If the discharge pressure control and the inflow pressure control is delayed a predetermined short time (about 3 seconds) switched by a timer or the like after the above inflow pressure P S to select the set pressure P3 to not switched frequently also. When the high entrance pressure P S than the inflow set pressure P2 in such a case, the speed increasing operation or the pump in the inflow pressure control, if you had slowed it is necessary to be a control operation such as fixing the speed come.
【００２３】[0023]
【発明の効果】以上に説明したように本発明では、流入
圧力制御における目標圧力を、吐出圧力制御と流入圧力
制御を切り換える選択設定圧力よりも若干高く設定した
ものである。従って、ポンプの流入圧力が低下して流入
圧力制御に切り換えられた場合には、直ちに流入圧力制
御時の目標圧力に近づくようにポンプの回転速度が制御
され、ポンプ流入側の水圧低下の原因が除去されたなら
ば、容易に吐出圧力制御への選択設定圧力を越えること
ができる。このため、従来技術と比較して速やかに本来
の動作である吐出圧力制御に戻ることができ、配水管の
水圧低下等に悪影響を及ぼすことなく、末端の給水機器
側に所定圧の給水を行うことができる。As described above, in the present invention, the target pressure in the inflow pressure control is set slightly higher than the selected set pressure for switching between the discharge pressure control and the inflow pressure control. Therefore, when the inflow pressure of the pump is reduced and the mode is switched to the inflow pressure control, the rotation speed of the pump is immediately controlled so as to approach the target pressure at the time of the inflow pressure control. Once removed, it can easily exceed the selected set pressure for discharge pressure control. For this reason, it is possible to quickly return to the original operation of the discharge pressure control as compared with the conventional technology, and to supply water of a predetermined pressure to the terminal water supply device side without adversely affecting the water pressure drop of the water distribution pipe and the like. be able to.
【図１】直結型の可変速給水装置のシステム構成の説明
図。FIG. 1 is an explanatory diagram of a system configuration of a direct connection type variable speed water supply device.
【図２】本発明の一実施例の可変速給水装置の制御系の
説明図。FIG. 2 is an explanatory diagram of a control system of the variable speed water supply device according to one embodiment of the present invention.
【図３】吐出圧力制御のフロー図。FIG. 3 is a flowchart of discharge pressure control.
【図４】流入圧力制御のフロー図。FIG. 4 is a flowchart of inflow pressure control.
【図５】流入圧力制御／吐出圧力制御の切り換えのフロ
ー図。FIG. 5 is a flowchart of switching between inflow pressure control / discharge pressure control.
【図６】本発明の一実施例の可変速給水装置による流入
側圧力の変動状態を示すグラフ。FIG. 6 is a graph showing a fluctuation state of an inflow side pressure by the variable speed water supply device according to the embodiment of the present invention.
【図７】従来の流入圧力制御／吐出圧力制御の切り換え
の一例を示すフロー図。FIG. 7 is a flowchart showing an example of conventional switching between inflow pressure control / discharge pressure control.
【図８】従来の可変速給水装置による流入側圧力の変動
状態を示すグラフ。FIG. 8 is a graph showing a fluctuation state of an inflow side pressure by a conventional variable speed water supply device.
２１ 流入圧力検出器 ２２ 制御部 ２３ 吐出圧力検出器 ２５ 可変速駆動手段（インバータ） ＰS 流入圧力 Ｐd 吐出圧力 Ｐ1 吐出設定圧力 Ｐ2 流入設定圧力 Ｐ3 流入圧力制御／吐出圧力制御の切り換えのため
の選択設定圧力Reference Signs List 21 inflow pressure detector 22 control unit 23 discharge pressure detector 25 variable speed drive means (inverter) P S inflow pressure P d discharge pressure P1 discharge set pressure P2 inflow set pressure P3 for switching between inflow pressure control / discharge pressure control Selection set pressure
Claims (1)
管に接続された加圧ポンプと、この加圧ポンプの吐出側
に接続され末端給水機器へと連結された吐出管と、前記
流入管に設けられた加圧ポンプの流入圧力を検出する流
入圧力検出器と、前記吐出管に設けられた加圧ポンプの
吐出圧力を検出する吐出圧力検出器と、前記加圧ポンプ
を可変速駆動する可変速駆動手段と、前記ポンプを制御
する制御手段とを備え、 該制御手段は、ポンプ吐出圧力があらかじめ定められた
吐出設定圧力になるように、吐出圧力が吐出設定圧力よ
りも高い時はポンプ速度を下げ、吐出圧力が吐出設定圧
力よりも低い時はポンプ速度を上げて前記ポンプの速度
を制御する吐出圧力制御手段と、ポンプ流入圧力があら
かじめ定められた流入設定圧力になるように、ポンプの
流入圧力が流入設定圧力よりも高い時はポンプ速度を上
げ、ポンプの流入圧力が流入設定圧力よりも低い時はポ
ンプ速度を下げて前記ポンプの速度を制御する流入圧力
制御手段とを備え、 前記流入設定圧力よりも若干低くあらかじめ定められた
前記吐出圧力制御手段と前記流入圧力制御手段の切換を
行う選択設定圧力とを有し、 流入圧力が該選択設定圧力よりも高い時は前記吐出圧力
制御を行い、 流入圧力が該選択設定圧力よりも低い時は前記流入圧力
制御を実行することを特徴とする可変速給水装置。1. An inflow pipe connected to a water distribution pipe, a pressurized pump connected to the inflow pipe, a discharge pipe connected to a discharge side of the pressurized pump and connected to a terminal water supply device, An inflow pressure detector that detects an inflow pressure of a pressurization pump provided in the inflow pipe, a discharge pressure detector that detects a discharge pressure of a pressurization pump provided in the discharge pipe, and a variable speed pump. Variable speed driving means for driving, and control means for controlling the pump, wherein the control means is adapted to control when the discharge pressure is higher than the discharge set pressure so that the pump discharge pressure becomes a predetermined discharge set pressure. The pump speed is reduced, and when the discharge pressure is lower than the discharge set pressure, the pump speed is increased to control the speed of the pump, so that the pump inflow pressure becomes a predetermined inflow set pressure. , Pump pressure control means for increasing the pump speed when the inflow pressure of the pump is higher than the set inflow pressure, and decreasing the pump speed when the inflow pressure of the pump is lower than the set inflow pressure to control the speed of the pump. Having a predetermined discharge pressure control means slightly lower than the inflow set pressure and a selected set pressure for switching the inflow pressure control means, wherein the discharge is performed when the inflow pressure is higher than the selected set pressure. A variable-speed water supply device comprising: performing pressure control; and performing the inflow pressure control when the inflow pressure is lower than the selected set pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07463995A JP3270287B2 (en) | 1995-03-07 | 1995-03-07 | Variable speed water supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07463995A JP3270287B2 (en) | 1995-03-07 | 1995-03-07 | Variable speed water supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08246519A JPH08246519A (en) | 1996-09-24 |
| JP3270287B2 true JP3270287B2 (en) | 2002-04-02 |
Family
ID=13552991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07463995A Expired - Fee Related JP3270287B2 (en) | 1995-03-07 | 1995-03-07 | Variable speed water supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3270287B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314863C (en) * | 2004-10-25 | 2007-05-09 | 姜全德 | Device for tapwater pipe line directly pressurizating |
| CN1314862C (en) * | 2004-10-25 | 2007-05-09 | 姜全德 | Device for directly water supplementing pressurization of tap water pipe line |
| CN1314864C (en) * | 2004-12-10 | 2007-05-09 | 姜全德 | Tap water pipe line direct multistage parallel pressurization device |
| JP4705830B2 (en) * | 2005-09-26 | 2011-06-22 | 株式会社川本製作所 | Water supply auxiliary pressure device |
-
1995
- 1995-03-07 JP JP07463995A patent/JP3270287B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08246519A (en) | 1996-09-24 |
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