JPH0613868B2 - Method for judging abnormal decrease in discharge pressure of pump equipment - Google Patents

Method for judging abnormal decrease in discharge pressure of pump equipment

Info

Publication number
JPH0613868B2
JPH0613868B2 JP24548283A JP24548283A JPH0613868B2 JP H0613868 B2 JPH0613868 B2 JP H0613868B2 JP 24548283 A JP24548283 A JP 24548283A JP 24548283 A JP24548283 A JP 24548283A JP H0613868 B2 JPH0613868 B2 JP H0613868B2
Authority
JP
Japan
Prior art keywords
pump
pressure
value
discharge pressure
max
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
Application number
JP24548283A
Other languages
Japanese (ja)
Other versions
JPS60142075A (en
Inventor
勉 高田
薫 中島
伸治 青戸
卓夫 赤堀
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.)
Ebara Corp
Ebara Densan Ltd
Original Assignee
Ebara Corp
Ebara Densan Ltd
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 Ebara Corp, Ebara Densan Ltd filed Critical Ebara Corp
Priority to JP24548283A priority Critical patent/JPH0613868B2/en
Publication of JPS60142075A publication Critical patent/JPS60142075A/en
Publication of JPH0613868B2 publication Critical patent/JPH0613868B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02Stopping, starting, unloading or idling control

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、複数台のポンプを並列に備えたポンプ設備に
おける各ポンプ起動時の吐出圧異常低下判定方法に関
し、複数ポンプを順次起動する際に、起動ポンプの吐出
圧の異常低下を確認しながら各ポンプの起動操作を順次
行うものである。
Description: TECHNICAL FIELD The present invention relates to a method for determining an abnormal decrease in discharge pressure at the time of starting each pump in pump equipment provided with a plurality of pumps in parallel. First, the starting operation of each pump is sequentially performed while confirming the abnormal decrease in the discharge pressure of the starting pump.

〔従来の技術〕[Conventional technology]

複数台のポンプを備えたポンプ設備において、各ポンプ
を順次駆動する場合、従来は、各ポンプ毎に圧力、回転
数、電流の検出装置を設け、予め設定された圧力設定値
と実測値とを比べ、そのポンプが吐出圧異常低下(圧力
低下)となっているか否かを判断していた。
In the pump equipment equipped with a plurality of pumps, when sequentially driving each pump, conventionally, a pressure, rotation speed, and current detection device is provided for each pump, and a preset pressure set value and measured value are set. In comparison, it was determined whether or not the pump had an abnormally low discharge pressure (pressure drop).

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

このような従来の方法であると、圧力等を各ポンプ毎に
直接検出しているので確実ではあるが、各ポンプ毎に取
付けるということで構造が複雑となりスペースを要し、
設備費が高くなると共に監視も面倒となる欠点があっ
た。
With such a conventional method, it is reliable because the pressure and the like are directly detected for each pump, but by mounting it for each pump, the structure becomes complicated and space is required.
There is a drawback that the equipment cost becomes high and the monitoring becomes troublesome.

本発明は、従来の方法の上記の如き欠点を除き、ポンプ
台数が多くとも、一つの圧力検出器、一つの電流検出器
により各ポンプの吐出圧異常低下を簡単に判定する方法
を提供することを目的とするものである。
The present invention, except for the above-mentioned drawbacks of the conventional method, provides a method for easily determining an abnormal decrease in the discharge pressure of each pump by using one pressure detector and one current detector even if the number of pumps is large. The purpose is.

〔課題を解決するための手段〕[Means for Solving the Problems]

本発明は、複数台のポンプを並列に備え、ポンプを順次
1台づつ追加して起動するポンプ設備においては、ポン
プの吐出圧異常低下が、停止状態にあるポンプを追加起
動した場合にその追加起動したポンプの異状に起因して
発生することがほとんどである、という経験上の知見に
基づいてなされたものであり、複数台のポンプを並列に
備え、各ポンプの吐出側を共通の吐出経路に連通させ、
前記複数台のポンプを順次1台ずつ追加して起動するポ
ンプ設備において、起動した各ポンプの起動時における P<P………(1) N≧Nmax……(2) I<I………(3) 但し、 P:共通の吐出経路における圧力実測値 P:共通の吐出経路における圧力設定値 N:運転中の各ポンプの回転数実測値 Nmax:運転中の各ポンプの定格最大回転数 I:ポンプを駆動中の電動機の総入力電流実測値 I:ポンプを駆動中の電動機の総定格電流値 なる判定条件を(1)から(3)へと順次判定し、条件(1)を
満足しない時は当該起動ポンプは正常とし、条件(1)を
満足した時は条件(2)の判定に入り、以下順次(3)までの
判定を行い、判定条件を満足しない時は当該起動ポンプ
は正常とし、条件(1),(2),(3)のすべてを満足した時
には当該起動ポンプは吐出圧異常低下となっていると判
定することを特徴とするポンプ設備の吐出圧異常低下判
定方法である。
According to the present invention, in a pump facility including a plurality of pumps in parallel and sequentially adding one pump at a time, the abnormal discharge pressure drop of the pump causes the pump to be added when the pump in the stopped state is additionally started. It was made based on the empirical knowledge that it mostly occurs due to the abnormalities of the started pumps.It is equipped with multiple pumps in parallel, and the discharge side of each pump is a common discharge path. To communicate with
In pumping equipment to start by adding one by one the plurality of pumps, P A <P S ......... ( 1) at start of each pump was started N A ≧ N max ...... (2 ) I A <I d ......... (3) where, P a: pressure measurement in a common discharge passage P S: pressure setting in a common discharge passage N a: rpm measured value of each pump during operation N max: driving Maximum rotational speed of each pump in the pump I A : Actual measured value of total input current of the motor driving the pump I d : Total rated current value of the motor driving the pump From (1) to (3) When the condition (1) is not satisfied, the starting pump is normal, and when the condition (1) is satisfied, the condition (2) is entered, and the following steps (3) are performed. When the judgment conditions are not satisfied, the starting pump is normal, and when all the conditions (1), (2), and (3) are satisfied, the starting pump is concerned. Dynamic pumps are discharged 圧異 normal drop judging method of pumping equipment, characterized by determined that the discharge 圧異 always reduced.

〔作用〕[Action]

複数台のポンプのうち初めの1台のポンプが起動された
場合、共通の吐出経路における圧力実測値Pと圧力設
定値Pとが、P≧Pであればこのポンプは正常と
する。
When the first one of the plurality of pumps is started, if the measured pressure value P A and the pressure set value P S in the common discharge path are P A ≧ P S , this pump is normal. To do.

しかし、P<Pなる場合には、このポンプが吐出圧
低下となっていることを示している。その場合、直ちに
このポンプは異常とは言えないので、次の段階であるこ
のポンプの回転数実測値Nとこのポンプの定格最大回
転数Nmaxとを比較し、N<Nmaxであれば回転を上げ
て吐出圧低下を防げる可能性があるから、このポンプは
正常とする。
However, when P A <P S, it means that the discharge pressure of this pump is lowered. In that case, this pump cannot be immediately said to be abnormal, so the next step is to compare the actual measured value N A of this pump with the rated maximum rotational speed N max of this pump, and if N A <N max If this is the case, the rotation speed may be increased to prevent a drop in discharge pressure, so this pump should be normal.

異常な吐出圧低下の場合、例えば空気混入があると圧力
が下がるため、圧力を一定に保とうとして回転数は増加
するが、回転数を増加しても空気混入のために圧力は上
がらず、回転数はNmaxかそれ以上となる。
In the case of an abnormal discharge pressure drop, for example, if air is mixed, the pressure will drop, so the number of revolutions will increase in an attempt to keep the pressure constant, but even if the number of revolutions is increased, the pressure will not rise due to air inclusion, The rotation speed is N max or higher.

即ち、このポンプがN≧Nmaxなる時は、さらにこの
ポンプが吐出圧異常低下であるかどうかの判定へと進め
る。
That is, when this pump satisfies N A ≧ N max , the process further proceeds to the determination of whether or not the discharge pressure of this pump is abnormally lowered.

従って、このポンプを駆動している電動機の入力電流実
測値Iとその電動機の定格電流値Iとを比較する。
Therefore, the actual measured input current value I A of the electric motor driving this pump is compared with the rated current value I d of the electric motor.

そして、I≧Iであればこのポンプは正常とする
が、異常な吐出圧低下の場合には、ポンプは正常送水状
態に比べて送水が少なくなり、正常時よりも仕事量が少
なくなる。よって、負荷も軽くなりNmaxでのIに比
べてIは低い値となるから、I<Iなる時のみ吐
出圧異常低下であると判定する。
Then, if I A ≧ I d , this pump is normal, but if the discharge pressure is abnormally low, the pump will supply less water than in the normal water supply state, and will have less work than in the normal state. . Therefore, the load is lightened and the value of I A becomes lower than the value of I d at N max. Therefore, it is determined that the discharge pressure is abnormally lowered only when I A <I d .

即ち、P<P、N≧Nmax、I<Iなる条件
を順次判定し、これらの条件をすべて満足した時にこの
ポンプに吐出圧異常低下が起こっていると判定する。
That is, the conditions of P A <P S , N A ≧ N max , and I A <I d are sequentially determined, and when all of these conditions are satisfied, it is determined that the discharge pressure abnormally decreases in this pump.

次に需要端の使用水量が増加し、1台のポンプの運転で
はまかないきれないとき、1台目のポンプ圧力実測値P
は漸次低下し、2台目のポンプが追加起動される。こ
の追加起動の後、前記共通の吐出経路における圧力実測
値Pと圧力設定値Pとの関係が、P≧Pならば
2台目のポンプは正常とし、P<Pなる場合には、
2台目のポンプの回転数実測値Nと、そのポンプの定
格最大回転数Nmaxとを比較し、N≧Nmaxであるとき
にはさらに次の総入力電流実測値と総定格電流値との比
較のステツプに進む。ここでIを2台のポンプを駆動
中の各電動機の総入力電流実測値として求め、Iをこ
れらの電動機の総定格電流値とする。このとき、I
であれば、2台目のポンプが吐出圧異常低下である
と判定する。
Next, when the amount of water used at the demand end increases and cannot be covered by the operation of one pump, the measured pressure P of the first pump P
A gradually decreases, and the second pump is additionally activated. After this additional start-up, if the relationship between the pressure actual measurement value P A and the pressure setting value P S in the common discharge path is P A ≧ P S , the second pump is normal and P A <P S. in case of,
The rotation speed measured value N A of the second pump is compared with the rated maximum rotation speed N max of the pump. When N A ≧ N max , the next total input current measured value and total rated current value are further compared. Proceed to the comparison step. Here, I A is obtained as the actual measured value of the total input current of each electric motor that is driving two pumps, and I d is the total rated current value of these electric motors. At this time, I A <
If it is I d , it is determined that the discharge pressure of the second pump is abnormally lowered.

ところで、初めに起動された1台目のポンプについては
前述の1台運転の場合の判定により吐出圧異常低下が起
こっていないということで2台目のポンプを追加起動し
たのであるから、吐出圧低下は2台目のポンプを追加起
動したことに起因しており、追加起動した2台目のポン
プに吐出圧異常低下が起こっていると判定する。
By the way, regarding the first pump that was started first, the second pump was additionally started because it was determined that the discharge pressure had not abnormally decreased according to the above-described judgment in the case of operating the first pump. The decrease is due to the additional start of the second pump, and it is determined that the discharge pressure abnormal decrease has occurred in the second pump that has been additionally started.

このようにして、ポンプを1台ずつ追加して起動し、順
次、P<P、N≧Nmax、I<Iなる条件の
判定を繰り返し、いずれかの判定条件を満足しない時は
直ちに正常とし、すべての判定条件を満足した時には、
追加起動したポンプに吐出圧異常低下が起こっていると
判定する。
In this way, start by adding a pump by one, sequentially, P A <P S, N A ≧ N max, repeated determination of I A <I d becomes conditions, does not satisfy any of the determination conditions When all the judgment conditions are satisfied,
It is determined that the discharge pressure has abnormally decreased in the additionally activated pump.

〔実施例〕〔Example〕

本発明の実施例を図面を用いて説明する。 Embodiments of the present invention will be described with reference to the drawings.

第1図においては3台のポンプ1A,1B,1Cが並列に設け
られている例を示す。2A,2B,2Cはそれぞれのポンプを
駆動する電動機である。3は、各ポンプの吐出側に連通
する共通の吐出経路に設けられた圧力検出器であり、4
は駆動中の電動機の総入力電流値を検出する電流検出
器、5A,5B,5Cは各ポンプの回転数を検出する回転数検
出器である。
FIG. 1 shows an example in which three pumps 1A, 1B and 1C are provided in parallel. 2A, 2B and 2C are electric motors that drive the respective pumps. Reference numeral 3 denotes a pressure detector provided on a common discharge path communicating with the discharge side of each pump.
Is a current detector that detects the total input current value of the motor being driven, and 5A, 5B, and 5C are rotation speed detectors that detect the rotation speed of each pump.

これらの検出器で測定した実測値及び、それらに対応す
る設定値或いは定格値を次の如く表わす。
The actual measured values measured by these detectors and the corresponding set values or rated values are shown below.

:共通の吐出経路に設けられた圧力検出器 3による圧力実測値、 P:共通の吐出経路における圧力設定値、 N:運転中の各ポンプの回転数実測値、 Nmax:運転中の各ポンプの定格最大回転数、 I:ポンプを駆動中の電動機の電流検出器4 による総入力電流実測値、 I:ポンプを駆動中の電動機の総定格電流値。P A : Actual pressure value measured by the pressure detector 3 provided on the common discharge path, P S : Pressure setting value on the common discharge path, N A : Actual rotation speed value of each pump during operation, N max : Operation Maximum rated speed of each pump in the pump, I A : Total input current measured value by the current detector 4 of the motor driving the pump, I d : Total rated current value of the motor driving the pump.

6は制御機構であり、各検出器からの実測値信号を入力
し、予め与えられている設定値或いは定格値と比較し後
述する如き判定を行って警報或いは運転停止などの信号
を出す。7はブザー、表示灯などの警報回路である。
Reference numeral 6 denotes a control mechanism, which inputs an actual measurement value signal from each detector, compares it with a preset value or a rated value, makes a determination as described later, and outputs a signal such as an alarm or an operation stop. Reference numeral 7 is an alarm circuit such as a buzzer and an indicator light.

また、制御機構6には、例えば電動機投入電磁接触器の
信号により、どのポンプが運転されているかの運転信号
も入力される。
Further, the control mechanism 6 also receives an operation signal indicating which pump is operating, for example, by a signal from the electric motor closing electromagnetic contactor.

判定動作につき第2図により説明する。The determination operation will be described with reference to FIG.

先ず、何号ポンプが運転中かの判断を運転信号に基づい
て行い、1号ポンプ1A,2号ポンプ1B又は3号ポンプ
1Cのアイテムへ進む。各アイテムにおけるフローにお
いては判断プロセスは同一である。
First, it is judged which pump is in operation based on the operation signal, and the process proceeds to the item of the first pump 1A, the second pump 1B or the third pump 1C. The determination process is the same in the flow of each item.

最初の例として、1号ポンプ1Aが起動された場合につ
いて説明する。
As a first example, a case where the No. 1 pump 1A is activated will be described.

いま、前記共通の吐出経路に設けられた圧力検出器3に
より検出した圧力実測値Pと圧力設定値Pとが、P
≧Pであれば1号ポンプ1Aは正常とするが、P
<Pなる場合には1号ポンプ1Aが吐出圧低下となっ
ていることを示しているが直ちに異常とは判定できな
い。
Now, the pressure actual measurement value P A and the pressure setting value P S detected by the pressure detector 3 provided in the common discharge path are P
If A ≧ P S , the No. 1 pump 1A is normal, but P A
When <P S, it means that the discharge pressure of the No. 1 pump 1A has decreased, but it cannot be immediately determined that the abnormality is present.

その場合、第2図のように、1号ポンプ1Aの回転数実
測値Nを回転数検出器5Aで求める。次いで、この回
転数実測値Nと1号ポンプ1Aの定格最大回転数N
maxとを比較し、N<Nmaxであれば回転を上げて吐出
圧低下を防げる可能性があるから、1号ポンプ1Aは正
常であるとする。
In that case, as shown in FIG. 2, the actual rotational speed value N A of the first pump 1A is obtained by the rotational speed detector 5A. Then, the rated maximum rotational speed N of the rotary speed actual value N A and No.1 pump 1A
It compares the max, and because there is a possibility that by increasing the rotation if N A <N max prevent the discharge pressure decrease, is successfully No.1 pump 1A.

ところで、1号ポンプ1Aが定速ポンプの時は常にN
=Nmaxであるが、空気混入があると圧力が下がるた
め、圧力を一定に保とうとして回転数は増加するが、回
転数を増加しても空気混入のために圧力は上がらず、回
転数はNmaxかそれ以上となっている。
However, whenever No.1 pump 1A is a constant speed pump N A
= N max , but the pressure decreases when air is mixed, so the number of revolutions increases in an attempt to keep the pressure constant, but even if the number of revolutions is increased, the pressure does not rise due to the inclusion of air, and the number of revolutions increases. Is N max or higher.

即ち、1号ポンプ1AがN≧Nmaxなる時は、さらに
1号ポンプ1Aが吐出圧異常低下であるかどうかの判定
へと進める。
That is, when the No. 1 pump 1A satisfies N A ≧ N max , the process further proceeds to the determination as to whether or not the No. 1 pump 1A has an abnormally low discharge pressure.

従って、1号ポンプ1Aを駆動中の電動機2Aの入力電流
実測値Iを電流検出器4で求め、これと電動機2Aの定
格電流値Iとを比較する。そして、I≧Iであれ
ば1号ポンプ1Aは正常とするが、異常な吐出圧低下の
場合には、1号ポンプ1Aは正常送水状態に比べて送水
が少なくなり、正常時よりも仕事量が少なくなる。よっ
て、負荷も軽くなりNmaxでのIに比べてIは低い
値となるから、I<Iなる時のみ吐出圧異常低下で
あると判定する。
Therefore, the actual input current value I A of the electric motor 2A driving the No. 1 pump 1A is obtained by the current detector 4, and this is compared with the rated current value I d of the electric motor 2A. When I A ≧ I d , the No. 1 pump 1A is normal, but when the discharge pressure is abnormally low, the No. 1 pump 1A supplies less water than in the normal water supply state, and is more than normal. Less work. Therefore, the load is lightened and the value of I A becomes lower than the value of I d at N max. Therefore, it is determined that the discharge pressure is abnormally lowered only when I A <I d .

即ち、P<P、N≧Nmax、I<Iなる条件
を順次判定し、これらの条件をすべて満足した時に1号
ポンプ1Aに吐出圧異常低下が起こっていると判定する。
That is, the conditions of P A <P S , N A ≧ N max , and I A <I d are sequentially determined, and when all of these conditions are satisfied, it is determined that the first pump 1A has an abnormal decrease in discharge pressure. .

次に運転している1号ポンプ1Aに2号ポンプ1Bを追
加起動し、2台運転となった場合について、第2図の2
号ポンプ1Bのフローに従って説明する。
The case where the No. 2 pump 1B is additionally activated to the No. 1 pump 1A that is operating next and two units are in operation
It will be described according to the flow of the No. pump 1B.

需要端の使用水量が増加し、1号ポンプ1Aの運転では
まかないきれないとき、1号ポンプの圧力実測値P
漸次低下し、2号ポンプ1Bが追加起動される。この追
加起動の後、1号ポンプ1Aの判定と同様に圧力検出器
3により検出した圧力実測値Pと圧力設定値Pとの
関係が、P<Pなる場合には、2号ポンプ1Bの回
転数実測値Nと2号ポンプ1Bの定格最大回転数N
maxとを比較し、N≧Nmaxであるときにはさらに、次
の入力電流実測値と総定格電流値との比較のステップに
進む。ここでIを駆動中の電動機2Aと2Bの総入力
電流実測値として電流検出器4で求め、Iを電動機2
Aと2Bの総定格電流値とする。このとき、I<I
であれば、2号ポンプ1Bが吐出圧異常低下であると判
定する。
When the amount of water used at the demand end increases and cannot be covered by the operation of the No. 1 pump 1A, the measured pressure value P A of the No. 1 pump gradually decreases and the No. 2 pump 1B is additionally activated. After this additional start-up, if the relationship between the pressure measurement value P A detected by the pressure detector 3 and the pressure setting value P S is P A <P S , as in the determination of the No. 1 pump 1A, No. 2 rated maximum rotational speed N of the rotary speed actual value N a and No.2 pump 1B of the pump 1B
Max is compared, and when N A ≧ N max , the process further proceeds to the step of comparing the next actual measured input current value with the total rated current value. Here, I A is obtained by the current detector 4 as a total input current measured value of the driving motors 2A and 2B, and I d is calculated as I d.
It is the total rated current value of A and 2B. At this time, I A <I d
If so, it is determined that No. 2 pump 1B has an abnormally low discharge pressure.

ところで、1号ポンプ1Aについては前述の判定により
吐出圧異常低下が起こっていないということで2号ポン
プ1Bを追加起動したのであるから、吐出圧低下は2号
ポンプ1Bを追加起動したことに起因しており、2号ポ
ンプ1Bに吐出圧異常低下が起こっていると判定する。
By the way, regarding the No. 1 pump 1A, the discharge pressure abnormally decreased according to the above-mentioned judgment, so that the No. 2 pump 1B was additionally started. Therefore, the discharge pressure decrease was caused by the additional No. 2 pump 1B being started. Therefore, it is determined that the discharge pressure abnormally decreases in the No. 2 pump 1B.

また、2号ポンプ1BがP<P、N≧Nmax、I
<Iなる条件の判定を順次行ない判定条件を満足し
ない時、即ち吐出圧異常低下が起こっていなく、3号ポ
ンプ1Cの起動に入った時は、3号ポンプの1Cの判定
も前述した2号ポンプ1Bと同様に行うが、この場合の
は駆動中の電動機2A,2B,2Cの総入力実測値
として電流検出器4で求めたもので、Iは電動機2A,
2B,2Cの総定格電流値である。
Further, No. 2 pump 1B has P A <P S , N A ≧ N max , I
When not satisfied sequentially performs determination condition determined A <I d becomes conditions, i.e. discharge圧異normally decreases not occurred, upon entering the activation of No. 3 pump 1C, the determination of the No. 3 pump 1C also previously described performed in the same manner as the No. 2 pump 1B, but this is I a when those obtained by the current detector 4 as a motor 2A, 2B, the total input measured value of 2C being driven, I d the electric motor 2A,
It is the total rated current value of 2B and 2C.

このようにして、吐出圧異常低下を判定したら警報或い
は運転停止などを行う。
In this way, when it is determined that the discharge pressure has abnormally decreased, an alarm or an operation stop is given.

〔発明の効果〕〔The invention's effect〕

以上述べたように本発明によれば、複数台のポンプを並
列に備え、各ポンプの吐出側を共通の吐出経路に連通さ
せ、前記複数台のポンプを順次1台づつ追加して起動す
るポンプ設備において、一つの圧力検出器と一つの電流
検出器で吐出圧の異常低下が起こっているか否かを簡単
に判定することができ、装置の構造も簡単となるとい
う、実用上極めて大なる効果を奏する。
As described above, according to the present invention, a pump that includes a plurality of pumps in parallel, connects the discharge sides of the pumps to a common discharge path, and sequentially starts adding the plurality of pumps one by one. In equipment, one pressure detector and one current detector can easily determine whether or not an abnormal decrease in discharge pressure has occurred, and the structure of the device is also simple. Play.

【図面の簡単な説明】 第1図は本発明の実施例のフロー図、第2図は動作のフ
ローチャートである。 1A,1B,1C……ポンプ、2A,2B,2C……電
動機、3……圧力検出器、4……電流検出器、 5A,5B,5C……回転数検出器、6……制御機構、
7……警報回路。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart of an embodiment of the present invention, and FIG. 2 is a flowchart of operation. 1A, 1B, 1C ... Pump, 2A, 2B, 2C ... Electric motor, 3 ... Pressure detector, 4 ... Current detector, 5A, 5B, 5C ... Rotation speed detector, 6 ... Control mechanism,
7 ... Alarm circuit.

フロントページの続き (72)発明者 中島 薫 東京都大田区羽田旭町11番1号 株式会社 荏原製作所内 (72)発明者 青戸 伸治 東京都大田区羽田旭町11番1号 株式会社 荏原製作所内 (72)発明者 赤堀 卓夫 東京都大田区羽田旭町11番1号 株式会社 荏原製作所内(72) Inventor Kaoru Nakajima 11-11 Haneda-Asahi-cho, Ota-ku, Tokyo Ebara Corporation (72) Inventor Shinji Aoto 11-11 Haneda-Asahi-cho, Ota-ku, Tokyo Ebara Corporation (72) Inventor Takuo Akahori 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Inside EBARA CORPORATION

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】複数台のポンプを並列に備え、各ポンプの
吐出側を共通の吐出経路に連通させ、前記複数台のポン
プを順次1台ずつ追加して起動するポンプ設備におい
て、起動した各ポンプの起動時における P<P………(1) N≧Nmax……(2) I<I………(3) 但し、 P:共通の吐出経路における圧力実測値 P:共通の吐出経路における圧力設定値 N:運転中の各ポンプの回転数実測値 Nmax:運転中の各ポンプの定格最大回転数 I:ポンプを駆動中の電動機の総入力電流実測値 I:ポンプを駆動中の電動機の総定格電流値 なる判定条件を(1)から(3)へと順次判定し、条件(1)を
満足しない時は当該起動ポンプは正常とし、条件(1)を
満足した時は条件(2)の判定に入り、以下順次(3)までの
判定を行い、判定条件を満足しない時は当該起動ポンプ
は正常とし、条件(1),(2),(3)のすべてを満足した時
には当該起動ポンプは吐出圧異常低下となっていると判
定することを特徴とするポンプ設備の吐出圧異常低下判
定方法。
1. A pump facility comprising a plurality of pumps arranged in parallel, wherein the discharge sides of the pumps are connected to a common discharge path, and the plurality of pumps are sequentially added one by one to start up. At the time of starting the pump P A <P S ……… (1) N A ≧ N max …… (2) I A <I d ……… (3) where P A : actual pressure measurement value in the common discharge path P S : Set pressure value in common discharge path N A : Actual measurement value of rotational speed of each operating pump N max : Rated maximum rotational speed of each operating pump I A : Total input current of electric motor driving the pump Measured value I d : The judgment condition that is the total rated current value of the electric motor that is driving the pump is sequentially judged from (1) to (3). If the condition (1) is not satisfied, the starting pump is regarded as normal and the condition is When the condition (1) is satisfied, the condition (2) is judged, and the judgments up to (3) are performed in order. When not satisfied, the starting pump is normal, and when all of the conditions (1), (2), and (3) are satisfied, the starting pump is determined to have abnormally reduced discharge pressure. Method for determining abnormal discharge pressure drop in equipment.
JP24548283A 1983-12-28 1983-12-28 Method for judging abnormal decrease in discharge pressure of pump equipment Expired - Lifetime JPH0613868B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24548283A JPH0613868B2 (en) 1983-12-28 1983-12-28 Method for judging abnormal decrease in discharge pressure of pump equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24548283A JPH0613868B2 (en) 1983-12-28 1983-12-28 Method for judging abnormal decrease in discharge pressure of pump equipment

Publications (2)

Publication Number Publication Date
JPS60142075A JPS60142075A (en) 1985-07-27
JPH0613868B2 true JPH0613868B2 (en) 1994-02-23

Family

ID=17134311

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24548283A Expired - Lifetime JPH0613868B2 (en) 1983-12-28 1983-12-28 Method for judging abnormal decrease in discharge pressure of pump equipment

Country Status (1)

Country Link
JP (1) JPH0613868B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019120195A (en) * 2018-01-05 2019-07-22 建興 ▲呉▼ Pump system and its control method
CN114412767B (en) * 2022-01-20 2024-08-09 温岭格朗智能科技有限公司 Intelligent control method of water pump

Also Published As

Publication number Publication date
JPS60142075A (en) 1985-07-27

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