JPH0275781A - Control device for feed pump - Google Patents

Control device for feed pump

Info

Publication number
JPH0275781A
JPH0275781A JP22452488A JP22452488A JPH0275781A JP H0275781 A JPH0275781 A JP H0275781A JP 22452488 A JP22452488 A JP 22452488A JP 22452488 A JP22452488 A JP 22452488A JP H0275781 A JPH0275781 A JP H0275781A
Authority
JP
Japan
Prior art keywords
pump
load
pumps
rated capacity
load factor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP22452488A
Other languages
Japanese (ja)
Inventor
Fumitomo Fujii
文倫 藤井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP22452488A priority Critical patent/JPH0275781A/en
Publication of JPH0275781A publication Critical patent/JPH0275781A/en
Pending legal-status Critical Current

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  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

PURPOSE:To enable parallel running of pumps having different kinds of rated capacity and lifts on the suction side by a method wherein a computer to determine a load from a feed water pressure and the number of revolutions of a pump and load factor from the load and a rated capacity is added and control is made so that the load factors of the pumps are kept at the same value as each other. CONSTITUTION:A computer 3 to determine the load factor of a pump from a feed water pressure 6 and the number 7 of revolutions of a pump is provided. By performing control by means of an output therefrom so that the load factors of pumps brought into a parallel running state are kept at the same value as each other, parallel running of the pumps being different in rated capacity and a lift on the suction side is practicable. Since the load of each pump is adjusted to a value responding to rated capacity, consumption of the pumps is averaged, and a defect in which a high load is exerted on a specified pump to increase the occurring frequency of a trouble is eliminated.

Description

【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は、並列運転する送水ポンプの制御装置に関する
。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a control device for water pumps that operate in parallel.

（従来の技術） 複数のポンプを並列に運転し、所定の圧力で送り出す場
合、圧力調節計の出力を回転数設定値とし、各ポンプに
対応した回転数調節計により、各ポンプの回転数が同一
となるような形で各ポンプの回転数を上下させ、所定の
圧力となるような制御を実行していた。(Prior art) When multiple pumps are operated in parallel and delivered at a predetermined pressure, the output of the pressure regulator is used as the rotation speed setting value, and the rotation speed of each pump is adjusted by the rotation speed controller corresponding to each pump. Control was performed by increasing and decreasing the rotational speed of each pump so that they were the same, and achieving a predetermined pressure.

（発明が解決しようとするｉｌＭ） 従来の技術では、ポンプの扱い込み側揚程が異なったり
、ポンプの定格容量が異なる場合、同一回転数で運転す
ると、各ポンプの定格容量に相応した負荷が加わらず、
重負荷で運転してしまうポンプの寿命を短くしたり、送
水しないポンプが出てきて、経済性を損ったりする問題
点があった。(ILM to be solved by the invention) In the conventional technology, when the pumps have different lifts on the handling side or different rated capacities, if the pumps are operated at the same rotation speed, a load corresponding to the rated capacity of each pump is not applied. figure,
There were problems such as shortening the lifespan of pumps that operate under heavy loads, and some pumps not delivering water, which impairs economic efficiency.

このため、ポンプを同一定格とし、吸い込み口を同一場
所とする等の制限があった。For this reason, there were restrictions such as having the pumps have the same rating and the suction ports in the same location.

本発明は、並列運転するポンプの負荷を定格容量に応じ
たものとする制御装置を提供し、上記従来技術の問題点
を解決することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a control device that adjusts the load of pumps operated in parallel according to their rated capacities, and to solve the problems of the prior art described above.

〔発明の構成〕[Structure of the invention]

（課題を解決するための手段） 送水圧力とポンプ回転数から負荷を求め、負荷と定格容
量から負荷率を求める演算器を付加し、各ポンプの負荷
率を同一に保つような制御装置を実現する。(Means for solving the problem) We have created a control device that maintains the same load factor for each pump by adding a calculator that calculates the load from the water supply pressure and pump rotation speed, and the load factor from the load and rated capacity. do.

（作　用） 本発明では、負荷率を同一に保つため、ポンプの定格容
量、吸い込み側揚程が異なっても並列運転が可能となる
。(Function) In the present invention, since the load factor is kept the same, parallel operation is possible even if the rated capacity and suction side lift of the pumps are different.

（実施例） 第１図は本発明の一実施例を示す構成図であり、送水圧
力６とポンプ回転数７からポンプの負荷率を求める演算
器３を具備し、この出力を用いて、並列運転するポンプ
の負荷率を同一に保ちながら制御を行なうことを特徴と
し、ポンプ定格容量及び吸い込み側揚程が異なった場合
も、制御を可能とする送水ポンプの制御装置である。(Embodiment) Fig. 1 is a configuration diagram showing an embodiment of the present invention, which is equipped with a calculator 3 that calculates the pump load factor from the water supply pressure 6 and the pump rotation speed 7, and uses this output to calculate the This water pump control device is characterized by performing control while keeping the load factor of the operating pump the same, and is capable of controlling even when the pump rated capacity and suction side lift differ.

第２図に、負荷率を求める演算器の構成を示す。FIG. 2 shows the configuration of an arithmetic unit for calculating the load factor.

ここでは、 負荷＝（ポンプ全揚程）Ｘ（ポンプ送水量）＝（送水圧
力＋吸い込み側揚程）Ｘ（ポンプ送水量）と定義してい
る。Here, it is defined as: Load = (total pump head) x (pump water flow rate) = (water pressure + suction side lift) x (pump water flow rate).

更に、送水量は、ポンプのＱ−Ｈ特性を利用し、ポンプ
回転数７と圧力信号６から求めている。第３図は、Ｑ−
Ｈ特性の説明図である。Ｑ−Ｈ特性とは、ポンプを回転
数Ｎで運転した時の送水量Ｑと全揚程Ｈとの関係を示す
もので、ポンプに固有の特性である。この特性により、
回転数Ｎと、全揚程Ｈが決まれば、その時の送水量Ｑが
求められる。この特性により１本発明では、各ポンプご
とに流量計を設けることなく、送水量を演算により求め
ている。尚、Ｐ□＝Ｐ＋ｈｉである。Further, the amount of water to be fed is determined from the pump rotation speed 7 and the pressure signal 6 using the Q-H characteristic of the pump. Figure 3 shows Q-
FIG. 3 is an explanatory diagram of H characteristics. The Q-H characteristic indicates the relationship between the water supply amount Q and the total head H when the pump is operated at the rotational speed N, and is a characteristic unique to the pump. Due to this characteristic,
Once the rotational speed N and the total head H are determined, the water supply amount Q at that time can be determined. Due to this characteristic, in the present invention, the water flow rate is determined by calculation without providing a flow meter for each pump. Note that P□=P+hi.

〔発明の効果〕〔Effect of the invention〕

従来技術と同一のポンプ回転数、及び送水圧力を入力信
号として用いて、定格容量及び吸い込み側揚程の異なる
ポンプの並列運転を可能としている。また、各ポンプの
負荷は、定格容量に相応したものとなるため、各ポンプ
の消耗が平均化され、特定のポンプに負荷が多く加わり
故障が多くなるといった欠点がない。By using the same pump rotation speed and water supply pressure as the input signals as in the prior art, it is possible to operate pumps with different rated capacities and suction-side lifts in parallel. Furthermore, since the load on each pump is commensurate with its rated capacity, the wear and tear on each pump is averaged out, and there is no drawback that a particular pump would be subject to a large load, resulting in more failures.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示す制御装置の構成図、第
２図は演算器の構成図、第３図はＱ−Ｈ特性の説明図で
ある。 １・・・ポンプ ２・・・負荷率調節計 ３・・・演算器 ４・・・圧力調節計 ６・・送水圧力 代理人　弁理士　則　近　憲　佑 同　　　　　　山　　下　　　　　− 第２図FIG. 1 is a block diagram of a control device showing an embodiment of the present invention, FIG. 2 is a block diagram of a computing unit, and FIG. 3 is an explanatory diagram of QH characteristics. 1...Pump 2...Load factor controller 3...Calculator 4...Pressure regulator 6...Water supply pressure agent Patent attorney Noriyuki Chika Yudo Yamashita - Figure 2

Claims (1)

【特許請求の範囲】[Claims] 送水圧力とポンプ回転数から負荷率を求める演算器と、
この演算器の出力により負荷率を同一に保ちながら運転
されるポンプと、このポンプの定格容量及び吸い込み側
揚程が異なった場合に調節する負荷率調節計とからなる
送水ポンプの制御装置。A calculator that calculates the load factor from the water supply pressure and pump rotation speed,
A water pump control device consisting of a pump that is operated while keeping the load factor the same based on the output of this calculator, and a load factor controller that adjusts when the rated capacity and suction side lift of this pump differ.
JP22452488A 1988-09-09 1988-09-09 Control device for feed pump Pending JPH0275781A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22452488A JPH0275781A (en) 1988-09-09 1988-09-09 Control device for feed pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22452488A JPH0275781A (en) 1988-09-09 1988-09-09 Control device for feed pump

Publications (1)

Publication Number Publication Date
JPH0275781A true JPH0275781A (en) 1990-03-15

Family

ID=16815150

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22452488A Pending JPH0275781A (en) 1988-09-09 1988-09-09 Control device for feed pump

Country Status (1)

Country Link
JP (1) JPH0275781A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010145013A (en) * 2008-12-18 2010-07-01 Takagi Ind Co Ltd Heat source machine and method for controlling the same
CN111502967A (en) * 2020-04-01 2020-08-07 上海电力大学 Optimized parallel operation method for multiple variable-frequency water pumps

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010145013A (en) * 2008-12-18 2010-07-01 Takagi Ind Co Ltd Heat source machine and method for controlling the same
CN111502967A (en) * 2020-04-01 2020-08-07 上海电力大学 Optimized parallel operation method for multiple variable-frequency water pumps

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