JP4386217B2

JP4386217B2 - Number of pumps control method

Info

Publication number: JP4386217B2
Application number: JP06770699A
Authority: JP
Inventors: 匠村田; 靖彦岡田
Original assignee: Toyo Electric Manufacturing Ltd
Current assignee: Toyo Electric Manufacturing Ltd
Priority date: 1999-03-15
Filing date: 1999-03-15
Publication date: 2009-12-16
Anticipated expiration: 2019-03-15
Also published as: JP2000265967A

Description

【０００１】
【発明の属する技術分野】
本発明は、送水・配水場の複数台の送水・配水用ポンプにおける台数制御方法に関する。
【０００２】
【従来の技術】
送水あるいは配水場に設置される送水・配水ポンプは、通常複数台である。
これは、配水する水の圧力（以下単に配水圧という）はほぼ一定に保たれる必要があり、且つ要求される水の流量（以下単に配水量という）は、広範囲に変化する為、配水圧を維持しつつ少ない配水量の時には１台のポンプを運転し、配水量が増加するにつれ運転ポンプの台数を増やして行くことで効率的な運転を行なう為である。
【０００３】
今、配水圧を維持しつつ少ない配水量を供給すべくポンプが１台のみ回転数制御されている（通常は配水圧一定にする為圧力制御するが、その結果としての回転数を制御するという事から、以降回転数制御という）とする。この状態で配水量が増加して行けば２台目のポンプが追加運転され、１台目のポンプと共に必要配水量を供給する為回転数が制御される。更に配水量が増えれば、３台目のポンプが追加運転され、１台目・２台目・3台目のポンプにより必要配水量を供給する為回転数が制御される。
【０００４】
このように、複数台のポンプにより必要配水量に応じた必要最小限のポンプ運転をする事により効率的な運転が可能となる。
さて、この２台目・３台目の追加運転はどうして決定されるかを図２に示す特性図で説明する。
【０００５】
図２は、ポンプを定格回転数で運転した時の配水圧と配水量の関係を表わす代表特性（以下単に代表Ｑ−Ｈ特性という）であり、（１）はポンプ１台のみの定格回転数運転時、（２）はポンプ２台の定格回転数運転時、（３）はポンプ３台の定格回転数運転時の代表Ｑ−Ｈ特性である。また、Ｐは維持したい配水圧を表わす。一般的に２台目、３台目の運転は、１台目のポンプ運転時に配水圧Ｐを維持しつつ配水量が増加して行き、代表Ｑ−Ｈ特性（１）と配水圧Ｐとの交点の配水量Ｑ１よりΔＱだけ小さい（Ｑ１−ΔＱ）に配水量が達した時２台目が追加運転される。更に配水量が増加して行き、代表Ｑ−Ｈ特性（２）と配水圧Ｐとの交点の配水量Ｑ２よりΔＱだけ小さい（Ｑ２−ΔＱ）に配水量が達した時３台目が追加運転される。以降同様に４台目、５台目と追加運転されて行く。
【０００６】
［発明が解決しようとする課題］さて、上述の配水量ΔＱを何故設定するかであるが、主に次の理由があげられる。図３の特性図に示すように、ポンプ自体の実際のＱ−Ｈ特性やあるいはポンプ経年変化などで、代表Ｑ−Ｈ特性（１）（図２の（１）と同じ）の左側に実際Ｑ−Ｈ特性（１）’があり、ΔＱを設けずＱ１にて２台目運転が入るよう設定されていれば、Ｑ１に達するまでに配水圧Ｐが実際特性（１）’に沿って低下する事になり、追加運転直前に配水圧Ｐの維持が不可能になる。（図３のＡ点で運転される）
この為、ポンプの実際特性が（１）’であっても、配水圧Ｐの維持が可能な配水量（Ｑ１−ΔＱ）の配水量に達した時２台目追加運転に入るようΔＱが設定されている。つまりΔＱが配水量の制御余裕代となっている。しかしながら、３台目・４台目とポンプ台数が増えてもΔＱが一定値であるなら、上述の余裕代は、１／（追加ポンプ台数）に等価的に減少した事になる。この為、配水量増加による追加運転直前の配水圧低下が発生するという課題を有していた。本発明は上述した点に鑑みて創案されたもので、その目的とするところは、これらの課題を解消するポンプの台数制御方法を提供することにある。
【０００７】
［課題を解決するための手段］つまり、その目的を達成するための手段は、１．請求項１について、送水・配水場に設置される複数の送水・配水ポンプの、送水・配水圧力を一定値に保ちながら送水・配水流量の変化に従い運転台数を増加させるポンプ台数制御方法であり、１台運転から２台目運転追加に際しては、１台目ポンプを定格回転数で運転した場合の送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（１）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ１より、本来１台目ポンプが持つ実際の特性曲線あるいはポンプ経年変化による特性曲線と、前記代表特性曲線（１）との差異量或は該差異量より大きい値ΔＱ１を差し引いた値（Ｑ１−ΔＱ１）に送水・配水量が達した時に行い、また、２台運転から３台目追加運転に際しては、１台目および２台目ポンプを共に定格回転数で運転した場合の総合的な送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（２）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ２より、本来１台目・２台目ポンプが持つ各々の実際の特性曲線、或はポンプ経年変化による該特性曲線と代表特性曲線（２）との差異の合計に相当する差異量或は該差異量より大きい値ΔＱ２を差し引いた値（Ｑ２−ΔＱ２）に送水・配水量が達した時に行い、同様の方法により、４台目、５台目、・・・、ｎ台目と追加運転させて行く事を特徴とするポンプ台数制御方法である。
【０００８】
２．請求項２について、送水・配水場に設置される複数の送水・配水ポンプの、送水・配水圧力を一定値に保ちながら送水・配水流量の変化に従い運転台数を増加させるポンプ台数制御方法であり、１台運転から２台目運転追加に際しては、１台目ポンプを定格回転数で運転した場合の送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（１）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ１より、本来１台目ポンプが持つ実際の特性曲線あるいはポンプ経年変化による特性曲線と、前記代表特性曲線（１）との差異量或は該差異量より大きい値ΔＱ１を差し引いた値（Ｑ１−ΔＱ１）に送水・配水量が達した時に行い、また、２台運転から３台目追加運転に際しては、１台目および２台目ポンプを共に定格回転数で運転した場合の総合的な送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（２）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ２より、本来１台目・２台目ポンプが持つ各々の実際の特性曲線、或はポンプ経年変化による該特性曲線と代表特性曲線（２）との差異の合計に相当する差異量或は該差異量より大きい値ΔＱ２を差し引いた値（Ｑ２−ΔＱ２）に送水・配水量が達した時に行い、同様の方法により、４台目、５台目、・・・、ｎ台目と追加運転させて行くに際し、各ポンプの定格回転数で運転した場合の送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線と、本来各ポンプが持つ実際の特性曲線或はポンプ経年変化による特性曲線との差異に相当する送水・配水量、或は該送水・配水量より大きい値をあらかじめ設定しておき、台数制御するポンプの自由な組み合わせに応じ、運転中ポンプの前記あらかじめ設定されている送水・配水量を加算し、これをその時の組み合わせられたポンプが持つ実際の特性曲線、或はポンプ経年変化による前記特性曲線と代表特性曲線との差異とする事を特徴とするポンプ台数制御方法である。
【０００９】
すなわち、請求項１において、配水量の制御余裕代ΔＱを変化させる事にある。例えば３台目の追加運転は、図２の代表Ｑ−Ｈ特性（２）に対して、１台目ポンプの余裕代分と２台目ポンプの余裕代分を加算した配水量の余裕代をＱ２から差し引いた配水量に配水量が達した時に行なう。４台目の追加運転は、図２の（３）に対して、１台目、２台目、３台目ポンプの余裕代分を加算した余裕代分をＱ３から差し引いた流量に配水量が達した時に行なう。
【００１０】
また、請求項２においては、台数制御されるポンプの組み合わせは自由に選択される事があり、運転中ポンプの余裕代を加算した値を固定する事には問題がある。
この時は、各ポンプの余裕代をあらかじめ設定しておき、自由な組み合わせの運転中ポンプ余裕代を加算した値を上記のようにＱ２やＱ３などから差し引くようにし、追加運転に移行させる方法である。
【００１１】
その作用は次のごとくである。
このように、課題であった配水量制御余裕代が等価的に１／（追加ポンプ台数）になる事なく、それぞれのポンプの配水量制御余裕代を確保する事が可能となる。
また、ポンプの自由な組み合わせによる台数制御の対応にも可能となる。
以下、本発明の一実施例を図面に基づいて詳述する。
【００１２】
【発明の実施の形態】
図１は本発明の一実施例を示す特性図であり、図中、図２と同一記号のものは同一の内容である。
今、配水圧Ｐを維持しつつ小配水量を供給する為ポンプが1台運転されているとする。これが、さらに配水量が増加し、やがて（Ｑ１−ΔＱ１）に配水量が達した時２台目ポンプの追加運転を開始する。この時のΔＱ１と図２のΔＱは同じものであり、１台目ポンプの配水量制御余裕代である。
更に配水量が増加し、やがて（Ｑ２−ΔＱ２）に配水量が達した時３台目の追加運転が開始されるが、この時の配水量制御余裕代はΔＱ２であり、これは１台目と２台目の制御余裕代の合計となっている。
同様に４台目運転は（Ｑ３−ΔＱ３）となり、配水量制御余裕代ΔＱ３は1台目・２台目・３台目の各余裕代の合計に設定されている。
【００１３】
つまり、この場合ΔＱ１、ΔＱ２、ΔＱ３の内訳は
ΔＱ１：１台目ポンプの配水量制御余裕代
ΔＱ２：１台目ポンプの配水量制御余裕代＋２台目ポンプの配水量制御余裕代
ΔＱ３：１台目ポンプの配水量制御余裕代＋２台目ポンプの配水量制御余裕代
＋３台目ポンプの配水量制御余裕代
となっている。
しかしながら、ポンプ台数制御においては運転するポンプの組み合わせを自由に選択する場合があり、ΔＱ１，２，３を固定値とする事には問題が発生する。そこで請求項２で示すように、各ポンプの配水量制御余裕代をあらかじめ設定しておき、自由な組み合わせによる運転中ポンプの各配水量制御余裕代を加算する事で上述の問題を回避できる。
【００１４】
例えば、上述でいう１台目と３台目ポンプが運転されており、２台目ポンプを追加運転する場合には、その総合余裕代をΔＱ２’とすれば
ΔＱ２’＝１台目ポンプの配水量制御余裕代＋３台目ポンプの配水量制御余裕代として加算すれば良く、ポンプの自由な組み合わせによる台数制御の対応にも可能となる。
【００１５】
［発明の効果］以上述べたように本発明によれば、ポンプ追加運転が、現在運転中のそれぞれの流量制御余裕代を合計した総合的な余裕代を差し引いた配水量に達した時に行われるため、図３の（１）’のようにポンプ自体が元々持つ実際Ｑ−Ｈ特性の違いや、経年変化による実際Ｑ−Ｈ特性の違いが存在しても、配水量増加による追加運転直前の配水圧低下を招くことは無くなる。また、ポンプの自由な組み合わせによる台数制御の対応にも可能となり、実用上、極めて有用性の高いものである。
【図面の簡単な説明】
【図１】本発明の請求項１および２記載の一実施例を示す特性図である。
【図２】従来技術の一例を示す特性図である。
【図３】図２のポンプが元々持つ特性や経年変化による特性の差異の説明図である。
【符号の説明】
（１）１台目ポンプの定格速度運転時における、配水圧と配水量の代表特性曲線
（２）１台目と２台目ポンプの定格速度運転時における、配水圧と配水量の代表特性曲線
（３）１台目と２台目と３台目ポンプの定格速度運転時における、配水圧と配水量の代表特性曲線
（１）’ １台目ポンプの定格速度運転時における、配水圧と配水量の実際特性曲線
Ｐ維持すべき配水圧
Ｑ１、Ｑ２、Ｑ３代表Ｑ−Ｈ特性（１）（２）（３）と維持すべき配水圧Ｐとの交点の配水量（Ｑ１−ΔＱ１）、（Ｑ２−ΔＱ２）、（Ｑ３−ΔＱ３）、（Ｑ１−ΔＱ）、（Ｑ２−ΔＱ）、（Ｑ３−ΔＱ）
ポンプ追加運転させる配水量
Ａ実際特性（１）’に従い流量がＱ１時において配水圧が低下して運転する動作点[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a number control method for a plurality of water supply / distribution pumps in a water supply / distribution station.
[0002]
[Prior art]
There are usually multiple water / distribution pumps installed in a water supply or distribution station.
This is because the pressure of the water to be distributed (hereinafter simply referred to as the “distribution pressure”) needs to be kept substantially constant, and the required flow rate of the water (hereinafter simply referred to as the “distribution amount”) varies widely. This is because one pump is operated at the time of a small amount of water distribution while maintaining the above, and an efficient operation is performed by increasing the number of operation pumps as the amount of water distribution increases.
[0003]
Currently, only one pump is controlled to supply a small amount of water while maintaining the water distribution pressure (normally the pressure is controlled to keep the water distribution pressure constant, but the resulting rotation speed is controlled. Therefore, it will be referred to as “rotational speed control”. If the amount of water distribution increases in this state, the second pump is additionally operated, and the rotational speed is controlled to supply the necessary amount of water distribution together with the first pump. If the amount of water distribution further increases, the third pump is additionally operated, and the number of revolutions is controlled to supply the required amount of water distribution by the first, second and third pumps.
[0004]
In this way, efficient operation is possible by performing the minimum required pump operation according to the required water distribution amount with a plurality of pumps.
Now, how the second and third additional operations are determined will be described with reference to the characteristic diagram shown in FIG.
[0005]
FIG. 2 shows representative characteristics (hereinafter simply referred to as representative QH characteristics) representing the relationship between the distribution pressure and the distribution amount when the pump is operated at the rated rotation speed. (1) is the rated rotation speed of only one pump. During operation, (2) is a typical QH characteristic during operation at the rated speed of two pumps, and (3) is a typical QH characteristic during operation at the rated speed of three pumps. P represents the distribution pressure to be maintained. In general, the operation of the second and third units increases the distribution amount while maintaining the distribution pressure P during the first pump operation, and the relationship between the representative QH characteristic (1) and the distribution pressure P When the amount of water distribution reaches (Q1-ΔQ) smaller than the water distribution amount Q1 at the intersection by ΔQ, the second unit is additionally operated. When the water distribution amount further increases, and the water distribution amount reaches (Q2-ΔQ) smaller by ΔQ than the water distribution amount Q2 at the intersection of the representative QH characteristic (2) and the water distribution pressure P, the third unit is additionally operated. Is done. Thereafter, the fourth and fifth units are additionally operated in the same manner.
[0006]
[Problems to be Solved by the Invention] The reason why the above-mentioned water distribution amount ΔQ is set is mainly due to the following reasons. As shown in the characteristic diagram of FIG. 3, the actual QH characteristic of the pump itself, or the pump aging, etc., the actual QH on the left side of the representative QH characteristic (1) (same as (1) of FIG. 2 ) . If there is -H characteristic (1) 'and ΔQ is not provided and the second unit operation is set to start at Q1, the water distribution pressure P decreases along the actual characteristic (1) ' before reaching Q1. As a result, it becomes impossible to maintain the distribution pressure P immediately before the additional operation. (Operated at point A in FIG. 3)
For this reason, even if the actual characteristics of the pump are (1) ', ΔQ is set so that the second additional operation can be started when the water distribution amount (Q1-ΔQ) that can maintain the water distribution pressure P is reached. Has been. That is, ΔQ is a control margin for the water distribution amount. However, if ΔQ is a constant value even if the number of pumps is increased at the third and fourth units, the above margin is equivalently reduced to 1 / (the number of additional pumps). For this reason, it had the subject that the water distribution pressure fall just before the additional operation by the amount of water distribution generate | occur | produced. The present invention has been made in view of the above-described points, and an object of the present invention is to provide a method for controlling the number of pumps that solves these problems.
[0007]
[Means for Solving the Problems] That is, means for achieving the object are as follows. About Claim 1, it is a pump number control method of increasing the number of operating units according to the change in the water supply / distribution flow rate while maintaining the water supply / distribution pressure at a constant value for a plurality of water supply / distribution pumps installed in the water supply / distribution station, When adding the second unit to the second unit, constant water supply / distribution on the representative characteristic curve (1) showing the relationship between the water supply / distribution pressure and the water supply / distribution flow rate when the first pump is operated at the rated speed From the water supply / distribution flow rate Q1 corresponding to the pressure P, the difference between the actual characteristic curve of the first pump or the characteristic curve due to aging of the pump and the representative characteristic curve (1) or larger than the difference Performed when the water supply / distribution amount reaches the value obtained by subtracting the value ΔQ1 (Q1-ΔQ1). In addition, the second and third pumps are operated at the rated speed for both the first and second pumps. When I drove From the water / distribution flow rate Q2 corresponding to the constant water / distribution pressure P on the representative characteristic curve (2) representing the relationship between the total water / distribution pressure and the water / distribution flow rate Each actual characteristic curve of the pump, or a difference amount corresponding to the sum of differences between the characteristic curve and the representative characteristic curve (2) due to aging of the pump, or a value obtained by subtracting a value ΔQ2 larger than the difference amount ( Q2-ΔQ2) When the water supply / distribution amount reaches, the number of pumps is controlled by the same method and the fourth unit, the fifth unit,..., The nth unit are additionally operated. It is.
[0008]
2. About Claim 2, it is a pump number control method of increasing the number of operating units according to the change of the water supply / distribution flow rate while keeping the water supply / distribution pressure of a plurality of water supply / distribution pumps installed in the water supply / distribution station, When adding the second unit to the second unit, constant water supply / distribution on the representative characteristic curve (1) showing the relationship between the water supply / distribution pressure and the water supply / distribution flow rate when the first pump is operated at the rated speed From the water supply / distribution flow rate Q1 corresponding to the pressure P, the difference between the actual characteristic curve of the first pump or the characteristic curve due to aging of the pump and the representative characteristic curve (1) or larger than the difference Performed when the water supply / distribution amount reaches the value obtained by subtracting the value ΔQ1 (Q1-ΔQ1). In addition, the second and third pumps are operated at the rated speed for both the first and second pumps. When I drove From the water / distribution flow rate Q2 corresponding to the constant water / distribution pressure P on the representative characteristic curve (2) representing the relationship between the total water / distribution pressure and the water / distribution flow rate Each actual characteristic curve of the pump, or a difference amount corresponding to the sum of differences between the characteristic curve and the representative characteristic curve (2) due to aging of the pump, or a value obtained by subtracting a value ΔQ2 larger than the difference amount ( Q2-ΔQ2) is performed when the amount of water delivered / distributed reaches, and the same method is used for additional operation with the 4th, 5th, ..., nth units, at the rated speed of each pump. The water supply / distribution volume corresponding to the difference between the representative characteristic curve representing the relationship between the water supply / distribution pressure and the water supply / distribution flow rate in operation, and the actual characteristic curve of each pump or the characteristic curve due to aging of the pump, Or a value larger than the water supply / distribution amount is indicated in advance. In accordance with the free combination of pumps to control the number of units, add the preset water supply / distribution amount of the pumps in operation, and add this to the actual characteristic curve of the combined pump at that time, Or it is a pump number control method characterized by making it the difference between the said characteristic curve by a pump secular change, and a representative characteristic curve.
[0009]
That is, in claim 1, the control allowance ΔQ of the water distribution amount is changed. For example, in the additional operation of the third unit, the margin of water distribution is calculated by adding the margin of the first pump and the margin of the second pump to the representative QH characteristics (2) in FIG. Performed when the water distribution reaches the water distribution subtracted from Q2. In the additional operation of the fourth unit, the amount of water distribution is equal to the flow rate obtained by subtracting the margin allowance for the first, second, and third pumps from Q3 with respect to (3) in FIG. When you reach it.
[0010]
Further, in claim 2, the combination of pumps to be controlled may be freely selected, and there is a problem in fixing the value obtained by adding the margin of the operating pump.
At this time, the margin of each pump is set in advance, and the value obtained by adding the pump margin during operation in a free combination is subtracted from Q2 or Q3 as described above, and the operation is shifted to the additional operation. is there.
[0011]
The operation is as follows.
Thus, it becomes possible to ensure the water supply amount control allowance of each pump, without the water supply amount control allowance which was a subject becoming equivalently 1 / (the number of additional pumps).
In addition, it is possible to support unit control by a free combination of pumps.
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a characteristic diagram showing an embodiment of the present invention. In the figure, the same symbols as those in FIG. 2 have the same contents.
Now, assume that one pump is operated to supply a small amount of water distribution while maintaining the water distribution pressure P. This further increases the water distribution amount, and when the water distribution amount eventually reaches (Q1-ΔQ1), the additional operation of the second pump is started. At this time, ΔQ1 and ΔQ in FIG. 2 are the same, which is a margin for controlling the amount of water distribution of the first pump.
When the amount of water distribution further increases and eventually the amount of water distribution reaches (Q2-ΔQ2), the third additional operation is started, but the water supply control margin at this time is ΔQ2, which is the first unit And the total control margin of the second unit.
Similarly, the fourth unit operation is (Q3-ΔQ3), and the water distribution amount control allowance ΔQ3 is set to the total of the allowance allowances of the first, second, and third units.
[0013]
That is, in this case, the breakdown of ΔQ1, ΔQ2, and ΔQ3 is: ΔQ1: water distribution control margin of the first pump ΔQ2: water distribution control margin of the first pump + water distribution control margin of the second pump ΔQ3: one Water supply control allowance for the second pump + water supply control allowance for the second pump + water supply control allowance for the third pump.
However, in controlling the number of pumps, there is a case where a combination of pumps to be operated is freely selected, and there is a problem in setting ΔQ1, 2, 3 to fixed values. Therefore, as shown in claim 2, the above-mentioned problem can be avoided by setting the water distribution amount control margin for each pump in advance and adding each water amount control margin for the operating pump by a free combination.
[0014]
For example, when the first and third pumps described above are operated and the second pump is additionally operated, if the total margin is ΔQ2 ′, ΔQ2 ′ = arrangement of the first pump. What is necessary is just to add as water amount control allowance + water supply amount control allowance of the 3rd pump, and it becomes possible to cope with unit control by a free combination of pumps.
[0015]
[Effects of the Invention] As described above, according to the present invention, the additional pump operation is performed when the water distribution amount obtained by subtracting the total allowance obtained by adding up the respective flow control allowances currently in operation is reached. Therefore, even if there is a difference in the actual QH characteristics inherent in the pump itself as shown in (1) 'of FIG. 3 or a difference in the actual QH characteristics due to secular change, It will not cause a drop in water distribution pressure. It is also possible to control the number of units by freely combining pumps, which is extremely useful in practice.
[Brief description of the drawings]
FIG. 1 is a characteristic diagram showing an embodiment of the first and second aspects of the present invention.
FIG. 2 is a characteristic diagram showing an example of a conventional technique.
FIG. 3 is an explanatory diagram of characteristics inherent to the pump of FIG. 2 and characteristics differences due to aging.
[Explanation of symbols]
(1) Typical characteristic curve of distribution pressure and distribution during the rated speed operation of the first pump
(2) Typical characteristic curves of distribution pressure and distribution amount during rated speed operation of the first and second pumps
(3) Typical characteristic curves of distribution pressure and distribution amount during rated speed operation of the first, second and third pumps
(1) 'Actual characteristics curve P of distribution pressure and distribution amount during rated speed operation of the first pump Distribution pressures Q1, Q2, Q3 to be maintained Typical QH characteristics (1) (2) (3) Water distribution amount at intersections with water distribution pressure P to be maintained ( Q1- ΔQ1), ( Q2- ΔQ2), ( Q3- ΔQ3), ( Q1- ΔQ), ( Q2- ΔQ), ( Q3- ΔQ)
Water distribution amount A to be additionally operated by the pump A Actual point of operation (1) Operating point at which the water distribution pressure decreases when the flow rate is Q1

Claims

送水・配水場に設置される複数の送水・配水ポンプの、送水・配水圧力を一定値に保ちながら送水・配水流量の変化に従い運転台数を増加させるポンプ台数制御方法において、１台運転から２台目運転追加に際しては、１台目ポンプを定格回転数で運転した場合の送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（１）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ１より、本来１台目ポンプが持つ実際の特性曲線あるいはポンプ経年変化による特性曲線と、前記代表特性曲線（１）との差異量或は該差異量より大きい値ΔＱ１を差し引いた値（Ｑ１−ΔＱ１）に送水・配水量が達した時に行い、また、２台運転から３台目追加運転に際しては、１台目および２台目ポンプを共に定格回転数で運転した場合の総合的な送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（２）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ２より、本来１台目・２台目ポンプが持つ各々の実際の特性曲線、或はポンプ経年変化による該特性曲線と代表特性曲線（２）との差異の合計に相当する差異量或は該差異量より大きい値ΔＱ２を差し引いた値（Ｑ２−ΔＱ２）に送水・配水量が達した時に行い、同様の方法により、４台目、５台目、・・・、ｎ台目と追加運転させて行く事を特徴とするポンプ台数制御方法。In the pump number control method that increases the number of operating pumps according to changes in the water supply / distribution flow rate while maintaining the water supply / distribution pressure at a constant value for multiple water supply / distribution pumps installed in the water supply / distribution station, one to two When adding the first operation, the water supply corresponding to the constant water supply / distribution pressure P on the representative characteristic curve (1) showing the relationship between the water supply / distribution pressure and the water supply / distribution flow rate when the first pump is operated at the rated speed. The value obtained by subtracting the difference ΔQ1 from the actual characteristic curve of the first pump or the characteristic curve due to aging of the pump and the representative characteristic curve (1) from the distribution flow rate Q1 or a value larger than the difference amount. Performed when the amount of water delivered / distributed reaches (Q1-ΔQ1), and in the case of the second unit to the third additional operation, the first and second pumps are both operated at the rated speed. Water supply・ From the water supply / distribution flow rate Q2 corresponding to the constant water supply / distribution pressure P on the representative characteristic curve (2) , which shows the relationship between the water distribution pressure and the water supply / distribution flow rate, each actual one that the first and second pumps originally have To the difference curve corresponding to the sum of the difference between the characteristic curve due to aging of the pump and the representative characteristic curve (2) or the value (Q2−ΔQ2) obtained by subtracting the value ΔQ2 larger than the difference amount. -A pump unit number control method characterized in that it is performed when the amount of water distribution reaches, and the fourth unit, the fifth unit,...

送水・配水場に設置される複数の送水・配水ポンプの、送水・配水圧力を一定値に保ちながら送水・配水流量の変化に従い運転台数を増加させるポンプ台数制御方法において、１台運転から２台目運転追加に際しては、１台目ポンプを定格回転数で運転した場合の送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（１）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ１より、本来１台目ポンプが持つ実際の特性曲線あるいはポンプ経年変化による特性曲線と、前記代表特性曲線（１）との差異量或は該差異量より大きい値ΔＱ１を差し引いた値（Ｑ１−ΔＱ１）に送水・配水量が達した時に行い、また、２台運転から３台目追加運転に際しては、１台目および２台目ポンプを共に定格回転数で運転した場合の総合的な送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線（２）上の一定送水・配水圧力Ｐに相当する送水・配水流量Ｑ２より、本来１台目・２台目ポンプが持つ各々の実際の特性曲線、或はポンプ経年変化による該特性曲線と代表特性曲線（２）との差異の合計に相当する差異量或は該差異量より大きい値ΔＱ２を差し引いた値（Ｑ２−ΔＱ２）に送水・配水量が達した時に行い、同様の方法により、４台目、５台目、・・・、ｎ台目と追加運転させて行くに際し、各ポンプの定格回転数で運転した場合の送水・配水圧力と送水・配水流量の関係を表わす代表特性曲線と、本来各ポンプが持つ実際の特性曲線或はポンプ経年変化による特性曲線との差異に相当する送水・配水量、或は該送水・配水量より大きい値をあらかじめ設定しておき、台数制御するポンプの自由な組み合わせに応じ、運転中ポンプの前記あらかじめ設定されている送水・配水量を加算し、これをその時の組み合わせられたポンプが持つ実際の特性曲線、或はポンプ経年変化による前記特性曲線と代表特性曲線との差異とする事を特徴とするポンプ台数制御方法。In the pump number control method that increases the number of operating pumps according to changes in the water supply / distribution flow rate while maintaining the water supply / distribution pressure at a constant value for multiple water supply / distribution pumps installed in the water supply / distribution station, one to two When adding the first operation, the water supply corresponding to the constant water supply / distribution pressure P on the representative characteristic curve (1) showing the relationship between the water supply / distribution pressure and the water supply / distribution flow rate when the first pump is operated at the rated speed. The value obtained by subtracting the difference ΔQ1 from the actual characteristic curve of the first pump or the characteristic curve due to aging of the pump and the representative characteristic curve (1) from the distribution flow rate Q1 or a value larger than the difference amount. Performed when the amount of water delivered / distributed reaches (Q1-ΔQ1), and in the case of the second unit to the third additional operation, the first and second pumps are both operated at the rated speed. Water supply・ From the water supply / distribution flow rate Q2 corresponding to the constant water supply / distribution pressure P on the representative characteristic curve (2) , which shows the relationship between the water distribution pressure and the water supply / distribution flow rate, each actual one that the first and second pumps originally have To the difference curve corresponding to the sum of the difference between the characteristic curve due to aging of the pump and the representative characteristic curve (2) or the value (Q2−ΔQ2) obtained by subtracting the value ΔQ2 larger than the difference amount.・ When the amount of water distribution reaches, the same method will be used to add water to the 4th, 5th,..., Nth units. The water supply / distribution volume corresponding to the difference between the representative characteristic curve representing the relationship between the water distribution pressure and the water supply / distribution flow rate and the actual characteristic curve inherent to each pump or the characteristic curve due to aging of the pump, or the water supply / distribution Set a value larger than the amount of water in advance, Depending on the free combination of pumps to control the number of units, add the preset water supply / distribution amount of the pumps in operation, and add this to the actual characteristic curve of the combined pumps at that time, or the pump aging A method for controlling the number of pumps, wherein the characteristic curve is different from the representative characteristic curve.