JP3464095B2 - Variable speed water supply - Google Patents
Variable speed water supplyInfo
- Publication number
- JP3464095B2 JP3464095B2 JP10197396A JP10197396A JP3464095B2 JP 3464095 B2 JP3464095 B2 JP 3464095B2 JP 10197396 A JP10197396 A JP 10197396A JP 10197396 A JP10197396 A JP 10197396A JP 3464095 B2 JP3464095 B2 JP 3464095B2
- Authority
- JP
- Japan
- Prior art keywords
- pump
- variable speed
- check valve
- control means
- pumps
- 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 - Lifetime
Links
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
- Feedback Control In General (AREA)
- Control Of Velocity Or Acceleration (AREA)
- Details Of Reciprocating Pumps (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、２台以上のポンプ
を並列運転可能な可変速給水装置に係り、特に並列運転
するポンプの追加・解列動作を安定に行うことができる
制御系の構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed water supply apparatus capable of operating two or more pumps in parallel, and particularly, a control system configuration capable of stably performing addition / disconnection operations of pumps operating in parallel. Regarding
【０００２】[0002]
【従来の技術】図１は、２台のポンプを備えた可変速給
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、２台のポンプ
１３ａ，１３ｂがこの流入管１２に接続されている。流
入管１２には、量水器（図示せず）が接続されて、使用
水量が計測される。各ポンプ１３ａ，１３ｂの吐出側に
は、末端給水機器１４へと連結された吐出管１５が接続
されている。2. Description of the Related Art FIG. 1 shows a system outline of a variable speed water supply system provided with two pumps. For example, an inflow pipe 12 is connected to a water distribution pipe 11 which is a main pipe of water supply, and two pumps 13a and 13b are connected to the inflow pipe 12. A water meter (not shown) is connected to the inflow pipe 12 to measure the amount of water used. A discharge pipe 15 connected to the terminal water supply device 14 is connected to the discharge side of each pump 13a, 13b.
【０００３】前記吐出管１５には、圧力タンク１６が接
続されている。また、ポンプ１３ａ，１３ｂの吐出側に
は、吐出管１５におけるポンプの吐出圧力を検出してこ
の圧力信号を制御手段１７に送る吐出圧力検出器１８が
備えられている。このポンプ１３ａ，１３ｂは、それぞ
れ例えば三相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）を備えた電動機からなる可
変速手段１９ａ，１９ｂを備え、可変速で駆動される。A pressure tank 16 is connected to the discharge pipe 15. A discharge pressure detector 18 for detecting the discharge pressure of the pump in the discharge pipe 15 and sending this pressure signal to the control means 17 is provided on the discharge side of the pumps 13a and 13b. The pumps 13a and 13b are each connected to a commercial power source of, for example, three-phase 200V.
It is equipped with variable speed means 19a, 19b consisting of an electric motor equipped with a voltage converter (inverter), and is driven at variable speed.
【０００４】前記制御手段１７は、吐出圧力検出器１８
の信号に基づき、各可変速手段１９ａ，１９ｂに信号を
送り、各ポンプ１３ａ，１３ｂの回転速度を所定の制御
目標圧力となるようにフィードバック制御する。この速
度制御は、通常制御の安定性等からＰＩ（比例積分）制
御が用いられている。The control means 17 includes a discharge pressure detector 18
A signal is sent to each of the variable speed means 19a and 19b based on the above signal, and the rotation speed of each pump 13a and 13b is feedback-controlled so as to reach a predetermined control target pressure. As the speed control, PI (proportional integration) control is used because of the stability of normal control.
【０００５】更に、前記吐出管１５には、各ポンプ１３
ａ，１３ｂの吐出側に位置して、例えばフロースイッチ
からなる少水量検出手段２０ａ，２０ｂと、逆流防止用
の逆止弁２１ａ，２１ｂとがそれぞれ介装され、前記各
少水量検出手段２０ａ，２０ｂからの信号が、前記制御
手段１７に送られるようになっている。少水量検出手段
により、需要家側１４で水の使用量がほとんど無い状態
が検出されると、ポンプの締切運転を防止し省エネルギ
化を図るため、ポンプ停止等の制御が制御手段１７によ
り行なわれる。Further, each pump 13 is attached to the discharge pipe 15.
Located on the discharge side of a, 13b, small water amount detecting means 20a, 20b comprising, for example, a flow switch, and check valves 21a, 21b for preventing backflow are respectively provided, and the small water amount detecting means 20a, The signal from 20b is sent to the control means 17. When the small amount of water detection means detects that the customer side 14 has almost no water consumption, the control means 17 controls the pump to be stopped in order to prevent the pump from shutting off and save energy. Be done.
【０００６】ところで２台のポンプ１３ａ，１３ｂは、
送水水量に応じて１台又は２台で制御目標圧力を保つよ
うに回転速度が制御されて運転される。使用水量が少な
い時は１台のみが運転され、使用水量が増加し、ポンプ
１台の運転では足りず制御目標圧力を維持できなくなっ
た時、即ち運転中の１台のポンプ１３ａの回転速度が最
高回転速度に達した時に、２台目のポンプ１３ｂの運転
を開始（追加投入）する。そして、その後、需要家側で
の使用水量が少なくなり、ポンプ１３ｂの回転速度が低
下して、１台のポンプで制御目標圧力を維持できるよう
になった時に、２台の内の１台のポンプ１３ａ又は１３
ｂを解列停止するようになっている。By the way, the two pumps 13a and 13b are
The rotation speed is controlled so that one unit or two units maintain the control target pressure in accordance with the amount of water to be sent. When the amount of water used is small, only one unit is operated, the amount of water used increases, and when the operation of one pump is insufficient to maintain the control target pressure, that is, the rotation speed of one pump 13a during operation is When the maximum rotation speed is reached, the operation of the second pump 13b is started (additional input). Then, after that, when the amount of water used on the consumer side decreases, the rotation speed of the pump 13b decreases, and the control target pressure can be maintained by one pump, one of the two pumps can be maintained. Pump 13a or 13
It is designed to stop the parallel disconnection of b.
【０００７】図３（Ａ）は、従来のポンプの追加運転時
の制御フローを示す。使用水量が増加し、ポンプ１台の
運転では間に合わなくなった時、即ち、図３（Ａ）に示
すように、ポンプ吐出圧力を所定の目標圧力に保つため
に、運転中の１台のポンプ１３ａに対して最高回転速度
指令が出力され、かつ追加遅延タイマが作動して、この
タイマ作動中継続してこの最高速度指令が出力され続け
ていた時に、２台目のポンプ１３ｂが追加運転される。FIG. 3 (A) shows a control flow at the time of additional operation of the conventional pump. When the amount of water used increases and it is not enough to operate one pump, that is, in order to keep the pump discharge pressure at a predetermined target pressure, as shown in FIG. When the maximum rotation speed command is output to and the additional delay timer is activated, and the maximum speed command is continuously output during the operation of this timer, the second pump 13b is additionally operated. .
【０００８】図３（Ｂ）は、従来のポンプの解列停止時
の制御フローを示す。その後、使用水量が少なくなり、
１台のポンプ１３ａは固定速で運転しており、可変速で
運転中のポンプ１３ｂの回転速度が低下して、少水量状
態となり、フロースイッチ２０ｂが閉じた時に、即ち、
図３（Ｂ）に示すように、フロースイッチ２０ｂが閉
じ、解列遅延タイマが作動して、このタイマ作動中継続
してこのフロースイッチ２０ｂが閉じ続けていた時に、
２台の内の１台のポンプ１３ｂの運転が停止（解列）さ
れる。FIG. 3 (B) shows a control flow when the conventional pump is disengaged. After that, the amount of water used decreased,
One pump 13a is operating at a fixed speed, and the rotational speed of the pump 13b that is operating at a variable speed is reduced to a small amount of water, and when the flow switch 20b is closed, that is,
As shown in FIG. 3 (B), when the flow switch 20b is closed and the disconnection delay timer is activated and the flow switch 20b is continuously closed during the operation of this timer,
The operation of one of the two pumps 13b is stopped (disconnected).
【０００９】ところで、ポンプ異常等により、吐出圧力
が低下した場合においては、吐出圧力が所定圧力値以
下、ポンプ回転速度が所定回転速度以下、フロースイッ
チが閉、運転電流が所定運転電流以下等の条件を組み合
わせて吐出圧力異常低下を検出し、警報を出すようにし
ている。この警報は、検出遅延タイマが所定時間作動
し、かつその期間中、所定の条件が継続している時に出
力される。By the way, when the discharge pressure decreases due to a pump abnormality or the like, the discharge pressure is below a predetermined pressure value, the pump rotation speed is below a predetermined rotation speed, the flow switch is closed, and the operating current is below a predetermined operating current. An abnormal drop in discharge pressure is detected by combining conditions, and an alarm is issued. This alarm is output when the detection delay timer operates for a predetermined period of time, and during that period, a predetermined condition continues.
【００１０】このポンプの吐出圧力異常低下の状態とし
ては、例えばポンプ吸込み側のバルブが誤って閉められ
てポンプが運転された場合などが挙げられる。ここに、
前記吐出圧力異常低下検出に使用される検出遅延タイマ
は、ポンプ始動時などの過渡的運転状態で吐出圧力異常
低下を検出してしまうことがないように、前記追加遅延
タイマや解列遅延タイマより時間が長く設定されてい
る。The state in which the discharge pressure of the pump is abnormally lowered includes, for example, a case where the valve on the suction side of the pump is erroneously closed and the pump is operated. here,
The detection delay timer used for detecting the abnormal discharge pressure drop is controlled by the additional delay timer or the disconnection delay timer so that the abnormal discharge pressure drop is not detected in a transient operating state such as when the pump is started. The time is set long.
【００１１】[0011]
【発明が解決しようとする課題】しかしながら、上記従
来例においては、何らかの原因で１台運転中のポンプに
異常が発生して吐出圧力が低下状態となると、このポン
プに対して最高回転速度指令が出される。上述したよう
に吐出圧力異常低下の遅延タイマは時間が長い。これに
対して追加動作を行うための遅延タイマは時間が短いの
で、吐出圧力異常低下警報を発生する前にポンプ追加動
作を行ってしまう。そして、使用水量が少ない場合に
は、直ぐに追加したポンプの解列動作を行って、追加・
解列を繰り返してしまうといった問題があった。However, in the above-mentioned conventional example, when the pump pressure during one unit operation is abnormal due to some reason and the discharge pressure is lowered, the maximum rotation speed command is issued to this pump. Will be issued. As described above, the delay timer for abnormal decrease in discharge pressure has a long time. On the other hand, since the delay timer for performing the additional operation is short, the pump additional operation is performed before the abnormal discharge pressure drop alarm is issued. If the amount of water used is small, immediately disconnect the pump and add the additional water.
There was a problem that the disconnection was repeated.
【００１２】また、２台以上のポンプが運転している状
態で、なんらかの原因でポンプ吐出圧力異常低下状態と
なると、可変速運転中のポンプのフロースイッチが閉じ
る。同様にポンプ解列動作の遅延タイマは、圧力異常低
下警報の検出遅延タイマと比較して短いので、吐出圧力
異常低下警報を発生する前にポンプ解列動作を行う。使
用水量がポンプ１台運転では不足する程度に多い場合に
は、直ぐに追加動作を行って、追加・解列を繰り返して
しまうといった問題があった。Further, when two or more pumps are operating and the pump discharge pressure abnormally drops for some reason, the flow switch of the pump during variable speed operation is closed. Similarly, the delay timer for the pump disconnection operation is shorter than the detection delay timer for the abnormal pressure drop alarm, so the pump disconnection operation is performed before the abnormal discharge pressure decrease alarm is issued. When the amount of water used is large enough to operate with one pump, there is a problem that the additional operation is immediately performed and the addition / disconnection is repeated.
【００１３】これは、前述のように、吐出圧力異常低下
警報出力の遅延タイマの方が追加動作遅延タイマや解列
動作遅延タイマより長いためであり、しかも追加された
ポンプや解列動作後に運転しているポンプの運転状態が
正常であれば、吐出圧力異常低下の条件が揃わなくなっ
て、警報は出力されない。This is because, as described above, the delay timer for the discharge pressure abnormal low alarm output is longer than the additional operation delay timer and the disconnection operation delay timer, and moreover, the operation is performed after the added pump and disconnection operation. If the operating state of the pump being operated is normal, the conditions for abnormally lowering the discharge pressure are not met, and no alarm is output.
【００１４】ここに、追加動作遅延タイマや解列動作遅
延タイマを吐出圧力異常低下警報出力の遅延タイマより
長くすることも考えられるが、このようにすると、追加
や解列に対する応答が遅くなって、吐出圧力の低下を招
いたり、無駄に複数のポンプを運転することを招いてし
まう。Here, it is conceivable that the additional operation delay timer or the disconnection operation delay timer is made longer than the delay timer for the discharge pressure abnormal drop alarm output, but in this case, the response to the addition or disconnection becomes slow. This leads to a decrease in discharge pressure and wasteful operation of a plurality of pumps.
【００１５】本発明は、上述した事情に鑑みて為された
もので、ポンプの吐出圧力異常低下状態を的確に検出し
て、誤った追加・解列動作を行わないようにした可変速
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 it is a variable speed water supply apparatus which accurately detects an abnormally lowered discharge pressure state of a pump and prevents an erroneous addition / disconnection operation. The purpose is to provide.
【００１６】[0016]
【課題を解決するための手段】本発明の可変速給水装置
は、電動機により回転駆動される複数のポンプと、該ポ
ンプの吐出側に設けた逆止弁と、該逆止弁の下流側に設
けた圧力検出器及び圧力タンクと、前記ポンプの少水量
検出手段と、前記ポンプを可変速駆動する可変速手段
と、前記ポンプを可変速に運転制御すると共に追加解列
する制御手段とを備えた可変速給水装置において、前記
制御手段は、少なくとも１台のポンプ運転時に該ポンプ
の回転速度が所定の速度に達したことと少水量検出手段
により少水量状態ではないことが検出されたことの加重
条件によって、他の停止中のポンプを追加運転させる手
段を備えたことを特徴とする。A variable speed water supply system of the present invention comprises a plurality of pumps which are rotationally driven by an electric motor, a check valve provided on the discharge side of the pumps, and a check valve provided downstream of the check valves. A pressure detector and a pressure tank provided, a small water amount detecting means for the pump, a variable speed means for driving the pump at a variable speed, and a control means for controlling the operation of the pump at a variable speed and additionally disconnecting the pump. In the variable speed water supply device, the control means detects that the rotational speed of the pump has reached a predetermined speed during operation of at least one pump and that the small water quantity detection means detects that the pump is not in the small water quantity state. It is characterized in that it is provided with means for additionally operating another pump that is stopped depending on the weighting condition.
【００１７】このように構成した本発明によれば、１台
のポンプが運転している時に使用水量が１台運転では不
足する程度増加すれば、ポンプの回転速度が最高回転速
度となり、かつフロースイッチ（少水量検出手段手段）
は開いたままである。従って、正常なポンプの追加動作
が行える。また、１台運転中のポンプに何らかの原因で
吐出圧力の低下が生じると、ポンプの回転速度は最高回
転速度となるが、フロースイッチは閉じてしまう。従っ
て、この両者を加重条件とすることにより、ポンプ異常
によって吐出圧力が低下しても、ポンプ追加動作は行わ
れず、追加解列を繰返すことを防止することができる。According to the present invention thus constructed, when one pump is in operation, if the amount of water used increases to the extent that one pump runs short, the rotational speed of the pump becomes the maximum rotational speed, and the flow rate is increased. Switch (Means for detecting small amount of water)
Remains open. Therefore, the normal addition operation of the pump can be performed. Further, if the discharge pressure drops for some reason during operation of one pump, the rotational speed of the pump reaches the maximum rotational speed, but the flow switch closes. Therefore, by setting both of these as weighted conditions, even if the discharge pressure is reduced due to a pump abnormality, the additional pump operation is not performed, and it is possible to prevent repeated additional disconnection.
【００１８】本発明の他の可変速給水装置は、電動機に
より回転駆動される複数のポンプと、該ポンプの吐出側
に設けた逆止弁と、該逆止弁の下流側に設けた圧力検出
器及び圧力タンクと、前記ポンプを可変速駆動する可変
速手段と、前記ポンプを可変速に運転制御すると共に追
加解列する制御手段とを備えた可変速給水装置におい
て、前記制御手段は、複数のポンプ運転時にポンプが少
水量状態にあることが検出され、且つ吐出圧力検出器に
より吐出圧力が所定値以上あることの加重条件によっ
て、運転中の内の１台のポンプを解列停止させる手段を
備えたことを特徴とする。Another variable-speed water supply device of the present invention is a plurality of pumps that are rotationally driven by an electric motor, a check valve provided on the discharge side of the pumps, and a pressure detection device provided on the downstream side of the check valves. and vessels and pressure tank, in the variable-speed water supply apparatus, comprising: a variable speed means for variable speed drives pre SL pump, and control means for adding disconnection while operation control the pump variable speed, said control means, is pump when a plurality of pump operation is detected to be in a small amount of water state, and by a weighted condition that the discharge pressure is higher than a predetermined value by the discharge pressure detector, a single pump of the in operation Kairetsu It is characterized in that it has means for stopping.
【００１９】このように構成した本発明によれば、複数
のポンプが運転している時に１台運転で間に合う程度に
使用水量が減少すれば、フロースイッチ（少水量検出手
段）が閉じ、かつ吐出圧力はほぼ一定の状態を維持す
る。従って、正常な解列動作を行うことができる。使用
水量が十分あり、複数のポンプが運転中にポンプ吐出圧
力が異常低下すると、ポンプのフロースイッチが閉じ、
かつ吐出圧力は所定値よりも低下する。従って、この両
者を加重条件とすることにより、吐出圧力異常低下によ
っては、ポンプ解列動作が行われず、ポンプの解列追加
動作が繰返されることを防止することができる。本発明
の他の可変速給水装置は、電動機により回転駆動される
複数のポンプと、該ポンプの吐出側に設けた逆止弁と、
該逆止弁の下流側に設けた圧力検出器及び圧力タンク
と、前記ポンプを可変速駆動する可変速手段と、前記ポ
ンプを可変速に運転制御するとともに前記複数のポンプ
を追加解列運転させる制御手段とを備え、前記制御手段
は、少なくとも１台のポンプ運転時に該ポンプの回転速
度が所定の速度に達したとしても、吐出圧力異常低下が
発生した場合は追加投入を行わないことを特徴とする。
本発明の他の可変速給水装置は、電動機により回転駆動
される複数のポンプと、該ポンプの吐出側に設けた逆止
弁と、該逆止弁の下流側に設けた圧力検出器及び圧力タ
ンクと、前記ポンプを可変速駆動する可変速手段と、前
記圧力検出器の信号に基づき制御目標圧力となるように
前記ポンプを可変速に運転制御するとともに前記複数の
ポンプを追加解列運転させる制御手段とを備え、前記制
御手段は、１台のポンプで前記制御目標圧力を維持でき
なくなったとしても、吐出圧力異常低下が発生した場合
は追加投入を行わないことを特徴とする。 本発明の他の
可変速給水装置は、電動機により回転駆動される複数の
ポンプと、該ポンプの吐出側に設けた逆止弁と、該逆止
弁の下流側に設けた圧力検出器及び圧力タンクと、前記
ポンプを可変速駆動する可変速手段と、前記ポンプを可
変速に運転制御するとともに前記複数のポンプを追加解
列運転させる制御手段とを備え、前記制御手段は、ポン
プ異常による吐出圧力低下時には追加解列を行わないこ
とを特徴とする。 本発明の他の可変速給水装置は、電動
機により回転駆動される複数のポンプと、該ポンプの吐
出側に設けた逆止弁と、該逆止弁の下流側に設けた圧力
検出器及び圧力タンクと、前記ポンプを可変速駆動する
可変速手段と、前記ポンプを可変速に運転制御するとと
もに前記複数のポンプを追加解列運転させる制御手段と
を備え、前記制御手段は、ポンプ異常による吐出圧力低
下時には追加投入を行わないことを特徴とする。 本発明
の他の可変速給水装置は、電動機により回転駆動される
複数のポンプと、該ポンプの吐出側に設けた逆止弁と、
該逆止弁の下流側に設けた圧力検出器及び圧力タンク
と、前記ポンプを可変速駆動する可変速手段と、前記ポ
ンプを可変速に運転制御するとともに前記複数のポンプ
を追加解列運転させる制御手段とを備え、前記制御手段
は、複数の運転中のポンプの１台が少水量状態になった
としても、吐出圧力異常低下が発生した場合は解列停止
を行わないことを特徴とする。 本発明の他の可変速給水
装置は、電動機により回転駆動される複数のポンプと、
該ポンプの吐出側に設けた逆止弁と、該逆止弁の下流側
に設けた圧力検出器及び圧力タンクと、前記ポンプを可
変速駆動する可変速手段と、前記ポンプを可変速に運転
制御するとともに前記複数のポンプを追加解列運転させ
る制御手段とを備え、前記制御手段は、ポンプ異常によ
る吐出圧力低下時には解列停止を行わないことを特徴と
する。 前記ポンプは配水管に接続された流入管に接続さ
れていることを特徴とする。 前記制御手段は、吐出圧力
異常低下を検出して警報を出すことを特徴とする。 前記
制御手段は、吐出圧力異常低下の検出に検出遅延タイマ
を用いることを特徴とする。 According to the present invention having the above-described structure, when a plurality of pumps are operating and the amount of water used is reduced to the extent that one pump can be operated, the flow switch (small water amount detecting means) is closed and the discharge is performed. The pressure remains almost constant. Therefore, a normal disconnection operation can be performed. If the amount of water used is sufficient and the pump discharge pressure drops abnormally during operation of multiple pumps, the flow switches of the pumps will close,
Moreover, the discharge pressure becomes lower than the predetermined value. Therefore, by setting both of these as weighted conditions, it is possible to prevent the pump disconnection operation from being performed and the pump disconnection addition operation to be repeated due to an abnormal decrease in the discharge pressure. The present invention
Another variable speed water supply device is driven to rotate by an electric motor.
A plurality of pumps, a check valve provided on the discharge side of the pumps,
Pressure detector and pressure tank provided downstream of the check valve
A variable speed means for driving the pump at a variable speed,
The pumps at a variable speed and the plurality of pumps.
And a control means for performing an additional parallel disconnection operation, the control means
Is the rotational speed of at least one pump during operation.
Even if the temperature reaches the specified speed, the discharge pressure will drop abnormally.
If it occurs, it is characterized by not performing additional input.
Another variable speed water supply device of the present invention is rotationally driven by an electric motor.
Multiple pumps and a check provided on the discharge side of the pumps
Valve, a pressure detector and a pressure sensor provided on the downstream side of the check valve.
And a variable speed means for driving the pump at a variable speed,
Set the control target pressure based on the signal from the pressure detector.
Along with controlling the operation of the pump at a variable speed,
And a control means for causing the pump to perform an additional parallel disconnection operation.
The control means can maintain the control target pressure with one pump.
Even if it disappears, if the discharge pressure drops abnormally
Is characterized by not performing additional input. Another of the present invention
The variable speed water supply device is composed of a plurality of rotary driven electric motors.
A pump, a check valve provided on the discharge side of the pump, and a check valve
A pressure detector and a pressure tank provided on the downstream side of the valve,
Variable speed means for driving the pump at a variable speed and the pump
Operation control for gear shifting and additional solution for the above-mentioned pumps
And a control means for operating in a row, the control means
When the discharge pressure drops due to
And are characterized. Another variable speed water supply device of the present invention is an electric
Pumps rotatably driven by the machine and the discharge of the pumps
Check valve provided on the outlet side and pressure provided on the downstream side of the check valve
Variable speed drive of the detector and pressure tank and the pump
A variable speed means and controlling the operation of the pump at a variable speed.
A control means for operating the plurality of pumps in an additional parallel disconnection operation
The control means is configured to reduce the discharge pressure due to a pump abnormality.
It is characterized in that no additional input is made at the bottom. The present invention
Another variable speed water supply device is driven to rotate by an electric motor.
A plurality of pumps, a check valve provided on the discharge side of the pumps,
Pressure detector and pressure tank provided downstream of the check valve
A variable speed means for driving the pump at a variable speed,
The pumps at a variable speed and the plurality of pumps.
And a control means for performing an additional parallel disconnection operation, the control means
One of the multiple running pumps was in a low water condition
Even if the discharge pressure abnormally drops, disconnection stops
Is characterized by not performing. Another variable speed water supply of the present invention
The device includes a plurality of pumps that are rotationally driven by an electric motor,
A check valve provided on the discharge side of the pump and a downstream side of the check valve
The pressure detector and pressure tank installed in the
Variable speed means for variable speed drive and variable speed operation of the pump
Control and operate the multiple pumps in an additional parallel
And a control means for controlling the pump abnormality.
The feature is that the parallel disconnection is not stopped when the discharge pressure drops.
To do. The pump is connected to the inflow pipe connected to the water distribution pipe.
It is characterized by being. The control means is a discharge pressure
It is characterized by detecting an abnormal decrease and issuing an alarm. The above
The control means uses a detection delay timer to detect an abnormal drop in discharge pressure.
Is used.
【００２０】[0020]
【実施例】以下、本発明の実施例について図面を参照し
ながら説明する。なお、以下の各実施例におけるポンプ
運転制御の前提となるシステムの概要は、図１に示す通
りである。配水管１１に接続された流入管１２と、この
流入管１２に接続された複数のポンプ１３ａ，１３ｂ
と、この各ポンプ１３ａ，１３ｂの吐出側に接続され末
端給水機器１４へと連結された吐出管１５と、この吐出
管１５に設けられ前記ポンプ１３ａ，１３ｂの吐出圧力
を検出する吐出圧力検出器１８と、前記各ポンプ１３
ａ，１３ｂをそれぞれ可変速駆動する可変速手段１９
ａ，１９ｂと、前記各ポンプ１３ａ，１３ｂをＰＩ制御
で可変速に運転制御すると共に追加解列する制御手段１
７とが備えられている。Embodiments of the present invention will be described below with reference to the drawings. In addition, the outline of the system which is the premise of the pump operation control in each of the following embodiments is as shown in FIG. Inflow pipe 12 connected to water distribution pipe 11, and a plurality of pumps 13a, 13b connected to this inflow pipe 12
And a discharge pipe 15 connected to the discharge side of each of the pumps 13a and 13b and connected to the terminal water supply device 14, and a discharge pressure detector provided on the discharge pipe 15 for detecting the discharge pressure of the pumps 13a and 13b. 18 and each of the pumps 13
Variable speed means 19 for respectively driving a and 13b at variable speeds
a, 19b and the control means 1 for controlling the operation of the pumps 13a, 13b at a variable speed by PI control and additionally disconnecting
7 and are provided.
【００２１】更に、前記吐出管１５には、各ポンプ１３
ａ，１３ｂの吐出側に位置して少水量検出手段２０ａ，
２０ｂと逆止弁２１ａ，２１ｂとが介装され、この各少
水量検出手段２０ａ，２０ｂからの信号が、前記制御手
段１７に送られるようになっている。Further, each pump 13 is attached to the discharge pipe 15.
Located on the discharge side of a, 13b, the small water amount detecting means 20a,
20b and check valves 21a, 21b are interposed, and signals from the small water amount detecting means 20a, 20b are sent to the control means 17.
【００２２】図２（Ａ）は、本発明の第１実施例を示す
制御フロー図である。この実施例は、前記図１に示す制
御手段１７に、少なくとも１台のポンプ運転時に該ポン
プの最高回転速度と少水量検出手段（フロースイッチ）
の開状態の加重条件によって、他の停止中のポンプを追
加運転させる手段を備えたものである。FIG. 2A is a control flow chart showing the first embodiment of the present invention. In this embodiment, the control means 17 shown in FIG. 1 is provided with a maximum rotation speed of the pump and a small water amount detection means (flow switch) when at least one pump is operating.
It is provided with a means for additionally operating another pump that is stopped depending on the weighted condition of the open state.
【００２３】即ち、同図に示すように、例えば１台のポ
ンプ１３ａが可変速で運転中に使用水量が増加し、この
ポンプ１３ａに対して目標吐出圧力を維持するために最
高回転速度指令が出力され、かつフロースイッチ２０ａ
が開いている状態が、追加遅延タイマの設定時間中、継
続してしている時に、ポンプ追加動作、即ちポンプ１３
ｂの運転を開始するようになっている。That is, as shown in the figure, for example, the amount of water used increases while one pump 13a is operating at a variable speed, and the maximum rotation speed command is issued to this pump 13a in order to maintain the target discharge pressure. Output and flow switch 20a
When the open state continues for the set time of the additional delay timer, the pump addition operation, that is, the pump 13
The operation of b is started.
【００２４】つまり、何らかの原因でポンプの吐出圧力
異常低下が発生した場合には、回転速度指令は上昇して
最高回転速度に達するが、吐出圧力が発生せず、フロー
スイッチは閉じてしまう。従って、上記の加重条件を満
たさずに、ポンプの追加動作は行われない。従って、吐
出圧力異常低下警報出力の遅延タイマ時間経過後に警報
が出され、誤った追加動作が行われずに確実に吐出圧力
異常低下を検出することができる。That is, when the discharge pressure of the pump abnormally drops for some reason, the rotation speed command increases and reaches the maximum rotation speed, but the discharge pressure does not occur and the flow switch is closed. Therefore, the additional operation of the pump is not performed without satisfying the weighting condition described above. Therefore, an alarm is issued after the elapse of the delay timer time for the output of abnormal discharge pressure alarm output, and the abnormal decrease in discharge pressure can be reliably detected without erroneous additional operations.
【００２５】図２（Ｂ）は、第２実施例を示す制御フロ
ー図である。この実施例は、前記図１に示す制御手段１
７に、複数のポンプ運転時に使用水量が低減し、ポンプ
１台運転で間に合う状態となった時に、吐出圧力と少水
量検出手段（フロースイッチ）の状態の加重条件によっ
て、運転中の内の１台のポンプを解列停止させる手段を
備えたものである。FIG. 2B is a control flow chart showing the second embodiment. In this embodiment, the control means 1 shown in FIG. 1 is used.
In Fig. 7, when the amount of water used is reduced during the operation of a plurality of pumps and it is in time for the operation of one pump, the discharge pressure and the condition of the small water amount detection means (flow switch) are weighted so that one of It is equipped with a means for stopping the pump of the platform from being disconnected.
【００２６】即ち、同図に示すように、例えば２台のポ
ンプ１３ａ，１３ｂの並列運転中に使用水量が少なくな
り、ポンプ１３ａは固定速で運転するが、可変速で運転
中のポンプ１３ｂの回転速度が減少し、フロースイッチ
２０ｂが閉じる。その時に吐出圧力が目標圧力の０．９
５倍以下にならない状態が、解列遅延タイマの設定時間
中、継続している時に、ポンプ解列動作、即ちポンプ１
３ｂの運転の停止を行うようになっている。That is, as shown in the figure, for example, the amount of water used decreases during parallel operation of the two pumps 13a and 13b, and the pump 13a operates at a fixed speed, but the pump 13b operating at a variable speed. The rotation speed decreases and the flow switch 20b closes. At that time, the discharge pressure is 0.9 of the target pressure.
When the state of not less than 5 times continues during the set time of the parallel delay timer, the pump parallel operation, that is, the pump 1
The operation of 3b is stopped.
【００２７】使用水量が十分にあり、複数のポンプが運
転中にポンプ吐出圧力が異常低下すると、フロースイッ
チは閉状態となるが、吐出圧力は低下してしまうので、
上記の加重条件を満たさない。従って、この場合には、
ポンプ解列動作は行われず、解列追加が繰返されること
が防止される。従って、吐出圧力異常低下警報出力の遅
延タイマ経過後に警報が出され、誤った解列動作が行わ
れずに確実に吐出圧力異常低下を検出することができ
る。When the amount of water used is sufficient and the pump discharge pressure drops abnormally while a plurality of pumps are operating, the flow switch is closed, but the discharge pressure drops, so
Does not meet the above weighting conditions. So in this case,
No pump disconnection operation is performed, and repeated disconnection additions are prevented. Therefore, an alarm is issued after the delay timer for the output of the abnormal discharge pressure drop warning has elapsed, and the abnormal decrease in discharge pressure can be reliably detected without erroneous disconnection operation.
【００２８】このように、ポンプ異常等による吐出圧力
低下時に誤った追加動作や解列動作が行われないように
なり、的確かつ応答性良くポンプの追加及び解列動作を
行うことができる。また、上記各実施例においては、２
台のポンプを備えた可変速給水装置に適用した例を示し
ているが、３台以上のポンプを備えた可変速給水装置に
も同様に適用できることは勿論である。また、上記各実
施例は水道の本管等に直結した可変速給水装置の例につ
いて説明したが、貯水槽等に一旦水を貯留してから需要
先に供給する可変速給水装置についても同様に適用でき
ることも、勿論のことである。As described above, the erroneous addition operation and disconnection operation are not performed when the discharge pressure is lowered due to a pump abnormality or the like, and the pump addition and disconnection operation can be accurately and responsively performed. Further, in each of the above embodiments, 2
Although the example applied to the variable speed water supply device provided with three pumps is shown, it is needless to say that the same can be applied to the variable speed water supply device provided with three or more pumps. In addition, each of the above embodiments has been described with respect to an example of a variable speed water supply device directly connected to a mains of a water supply, but the same applies to a variable speed water supply device that temporarily stores water in a water tank or the like and then supplies it to a customer. Of course, it can be applied.
【００２９】[0029]
【発明の効果】以上に説明したように、本発明によれ
ば、２台以上のポンプを備えた可変速給水装置で、ポン
プ追加動作やポンプ解列動作を行う時に、ポンプ異常等
による吐出圧力異常低下状態を的確に検出して、このよ
うな異常時に誤ってポンプ追加やポンプ解列動作を行っ
てしまうことを防止することができる。As described above, according to the present invention, in the variable speed water supply device having two or more pumps, the discharge pressure due to a pump abnormality or the like is generated when the pump adding operation or the pump disconnecting operation is performed. It is possible to accurately detect the abnormally lowered state and prevent erroneous pump addition or pump disconnection operation at the time of such an abnormality.
【図１】可変速給水装置のシステム構成の概要図。FIG. 1 is a schematic diagram of a system configuration of a variable speed water supply device.
【図２】（Ａ）本発明の第１実施例のポンプ追加動作の
制御フロー図、（Ｂ）本発明の第２実施例のポンプ解列
動作の制御フロー図。FIG. 2A is a control flow chart of a pump addition operation of the first embodiment of the present invention, and FIG. 2B is a control flow chart of a pump disconnection operation of the second embodiment of the present invention.
【図３】（Ａ）従来例のポンプ追加動作の制御フロー
図、（Ｂ）従来例のポンプ解列動作の制御フロー図。3A is a control flow diagram of a conventional pump addition operation, and FIG. 3B is a control flow diagram of a conventional pump disconnection operation.
１２ 流入管 １３ａ，１３ｂ ポンプ １５ 吐出管 １６ 圧力タンク １７ 制御手段 １８ 吐出圧力検出器 １９ａ，１９ｂ 可変速手段 ２０ａ，２０ｂ 少水量検出手段（フロースイッチ） 12 Inflow pipe 13a, 13b pump 15 Discharge pipe 16 Pressure tank 17 Control means 18 Discharge pressure detector 19a, 19b Variable speed means 20a, 20b Small water amount detecting means (flow switch)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｇ０５Ｄ 13/62 Ｇ０５Ｄ 13/62 Ｃ (72)発明者 手嶋 友治 神奈川県藤沢市本藤沢４丁目１番１号 株式会社 荏原電産内 (56)参考文献 実開 昭61−57193（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F04B 49/06 321 E03B 5/02 F04B 23/02 F04B 23/04 G05B 11/18 G05D 13/62 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI G05D 13/62 G05D 13/62 C (72) Inventor Tomoharu Teshima 4-1-1 Motofujisawa, Fujisawa-shi, Kanagawa Ebara Denki Co., Ltd. Sanai (56) References: Actual Development Sho 61-57193 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) F04B 49/06 321 E03B 5/02 F04B 23/02 F04B 23 / 04 G05B 11/18 G05D 13/62
Claims (11)
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プの少水量検出手段と、前記ポンプを可変速駆動する可
変速手段と、前記ポンプを可変速に運転制御すると共に
追加解列する制御手段とを備えた可変速給水装置におい
て、 前記制御手段は、少なくとも１台のポンプ運転時に該ポ
ンプの回転速度が所定の速度に達したことと少水量検出
手段により少水量状態ではないことが検出されたことの
加重条件によって、他の停止中のポンプを追加運転させ
る手段を備えたことを特徴とする可変速給水装置。1. A plurality of pumps rotationally driven by an electric motor, a check valve provided on the discharge side of the pumps, a pressure detector and a pressure tank provided on the downstream side of the check valve, and a pump of the pump. In a variable speed water supply device comprising a small amount of water detection means, a variable speed means for driving the pump at a variable speed, and a control means for controlling the operation of the pump at a variable speed and additionally disconnecting the pump, the control means is at least When one pump is operating, the other pumps are additionally operated under the weighted condition that the rotation speed of the pump reaches a predetermined speed and that the small water amount detecting means detects that the pump is not in the small water amount state. A variable-speed water supply device, which is provided with a means for making it possible.
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プを可変速駆動する可変速手段と、前記ポンプを可変速
に運転制御すると共に追加解列する制御手段とを備えた
可変速給水装置において、 前記制御手段は、複数のポンプ運転時にポンプが少水量
状態にあることが検出され、且つ吐出圧力検出器により
吐出圧力が所定値以上あることの加重条件によって、運
転中の内の１台のポンプを解列停止させる手段を備えた
ことを特徴とする可変速給水装置。A plurality of pump that is rotationally driven by 2. A motor, a check valve provided on the discharge side of the pump, a pressure detector and a pressure tank provided on the downstream side of the check valve, pre-Symbol pump a variable speed means for variable speed drives, in the variable-speed water supply and control means for adding disconnection while operation control the pump variable speed, said control means is pump when a plurality of pump operation It is provided with a means for stopping one of the pumps in operation by disconnection when a small amount of water is detected and the discharge pressure detector detects the discharge pressure is a predetermined value or more. Variable speed water supply device.
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プを可変速駆動する可変速手段と、前記ポンプを可変速
に運転制御するとともに前記複数のポンプを追加解列運
転させる制御手段とを備え、 前記制御手段は、少なくとも１台のポンプ運転時に該ポ
ンプの回転速度が所定の速度に達したとしても、吐出圧
力異常低下が発生した場合は追加投入を行わないことを
特徴とする可変速給水装置。 3. A plurality of pumps rotationally driven by an electric motor.
The check valve provided on the discharge side of the pump, and the check valve of the check valve.
A pressure detector and a pressure tank provided on the downstream side,
Variable speed means for driving the pump at a variable speed and the pump at a variable speed
Operation control and additional parallel operation
And a control means for rotating the pump , wherein the control means is operable when at least one pump is in operation.
Even if the pump rotation speed reaches the specified speed, the discharge pressure
If abnormal power drop occurs, do not perform additional injection.
Characteristic variable speed water supply device.
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プを可変速駆動する可変速手段と、前記圧力検出器の信
号に基づき制御目標圧力となるように前記ポンプを可変
速に運転制御するとともに前記複数の ポンプを追加解列
運転させる制御手段とを備え、 前記制御手段は、１台のポンプで前記制御目標圧力を維
持できなくなったとしても、吐出圧力異常低下が発生し
た場合は追加投入を行わないことを特徴とする可変速給
水装置。 4. A plurality of pumps rotationally driven by an electric motor.
The check valve provided on the discharge side of the pump, and the check valve of the check valve.
A pressure detector and a pressure tank provided on the downstream side,
Of the pressure detector and the variable speed means for driving the pump at a variable speed.
Variable the pump so that the control target pressure is reached based on the
Operation control at high speed and additional disconnection of multiple pumps
And a control means for operating the control means, wherein the control means maintains the control target pressure with one pump.
Even if you can no longer hold, the discharge pressure will drop abnormally.
Variable speed supply characterized by not adding additional
Water equipment.
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プを可変速駆動する可変速手段と、前記ポンプを可変速
に運転制御するとともに前記複数のポンプを追加解列運
転させる制御手段とを備え、 前記制御手段は、ポンプ異常による吐出圧力低下時には
追加解列を行わないことを特徴とする可変速給水装置。 5. A plurality of pumps rotationally driven by an electric motor.
The check valve provided on the discharge side of the pump, and the check valve of the check valve.
A pressure detector and a pressure tank provided on the downstream side,
Variable speed means for driving the pump at a variable speed and the pump at a variable speed
Operation control and additional parallel operation
And a control means for rotating the control means, which controls when the discharge pressure decreases due to a pump abnormality.
A variable-speed water supply device characterized by not performing additional parallel disconnection.
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プを可変速駆動する可変速手段と、前記ポンプを可変速
に運転制御するとともに前記複数のポンプを追加解列運
転させる制御手段とを備え、 前記制御手段は、ポンプ異常による吐出圧力低下時には
追加投入を行わないことを特徴とする可変速給水装置。 6. A plurality of pumps rotationally driven by an electric motor.
The check valve provided on the discharge side of the pump, and the check valve of the check valve.
A pressure detector and a pressure tank provided on the downstream side,
Variable speed means for driving the pump at a variable speed and the pump at a variable speed
Operation control and additional parallel operation
And a control means for rotating the control means, which controls when the discharge pressure decreases due to a pump abnormality.
A variable speed water supply system characterized by not being additionally charged.
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プを可変速駆動する可変速手段と、前記ポンプを可変速
に運転制御するとともに前記複数のポンプを追加解列運
転させる制御手段とを備え、 前記制御手段は、複数の運転中のポンプの１台が少水量
状態になったとしても、吐出圧力異常低下が発生した場
合は解列停止を行わないことを特徴とする可変速給水装
置。 7. A plurality of pumps rotationally driven by an electric motor.
The check valve provided on the discharge side of the pump, and the check valve of the check valve.
A pressure detector and a pressure tank provided on the downstream side,
Variable speed means for driving the pump at a variable speed and the pump at a variable speed
Operation control and additional parallel operation
And a control means for rotating the pump , wherein the control means is such that one of the plurality of operating pumps has a small amount of water.
Even if the status becomes abnormal, if abnormal discharge pressure drop occurs,
Variable speed water supply equipment characterized by not performing parallel disconnection stop
Place
プと、該ポンプの吐出側に設けた逆止弁と、該逆止弁の
下流側に設けた圧力検出器及び圧力タンクと、前記ポン
プを可変速駆動する可変速手段と、前記ポンプを可変速
に運転制御するとともに前記複数のポンプを追加解列運
転させる制御手段とを備え、 前記制御手段は、ポンプ異常による吐出圧力低下時には
解列停止を行わないことを特徴とする可変速給水装置。 8. A plurality of pumps rotationally driven by an electric motor.
The check valve provided on the discharge side of the pump, and the check valve of the check valve.
A pressure detector and a pressure tank provided on the downstream side,
Variable speed means for driving the pump at a variable speed and the pump at a variable speed
Operation control and additional parallel operation
And a control means for rotating the control means, which controls when the discharge pressure decreases due to a pump abnormality.
A variable-speed water supply device characterized by not performing parallel disconnection stop.
に接続されていることを特徴とする請求項１乃至８のい
ずれか１項に記載の可変速給水装置。 9. The pump is an inflow pipe connected to a water distribution pipe.
9. It is connected to
The variable speed water supply device according to item 1.
検出して警報を出すことを特徴とする請求項１乃至９の
いずれか１項に記載の可変速給水装置。 10. The control means controls abnormal discharge pressure reduction.
10. The method according to claim 1, wherein an alarm is generated upon detection.
The variable speed water supply device according to any one of claims.
検出に検出遅延タイマを用いることを特徴とする請求項
１０記載の可変速給水装置。 11. The control means is provided for controlling an abnormal decrease in discharge pressure.
A detection delay timer is used for detection.
10. The variable speed water supply device according to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10197396A JP3464095B2 (en) | 1996-04-01 | 1996-04-01 | Variable speed water supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10197396A JP3464095B2 (en) | 1996-04-01 | 1996-04-01 | Variable speed water supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09268978A JPH09268978A (en) | 1997-10-14 |
| JP3464095B2 true JP3464095B2 (en) | 2003-11-05 |
Family
ID=14314820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10197396A Expired - Lifetime JP3464095B2 (en) | 1996-04-01 | 1996-04-01 | Variable speed water supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3464095B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4069450B2 (en) * | 2003-06-24 | 2008-04-02 | 日立工機株式会社 | Air compressor and control method thereof |
| JP4033087B2 (en) * | 2003-09-10 | 2008-01-16 | 日立工機株式会社 | Air compressor and control method thereof |
| JP5215778B2 (en) * | 2008-08-29 | 2013-06-19 | 株式会社荏原製作所 | Pump system |
| JP6643118B2 (en) * | 2016-02-03 | 2020-02-12 | 株式会社荏原製作所 | Water supply device and method of operating water supply device |
| JP6643117B2 (en) * | 2016-02-03 | 2020-02-12 | 株式会社荏原製作所 | Water supply device and method of operating water supply device |
| CN106499005B (en) * | 2016-10-14 | 2019-03-05 | 江苏大学镇江流体工程装备技术研究院 | A kind of water supply pump station feedback control system |
-
1996
- 1996-04-01 JP JP10197396A patent/JP3464095B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09268978A (en) | 1997-10-14 |
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