JPS58183893A - Flow amount operating device for variable speed pump - Google Patents

Flow amount operating device for variable speed pump

Info

Publication number
JPS58183893A
JPS58183893A JP6525782A JP6525782A JPS58183893A JP S58183893 A JPS58183893 A JP S58183893A JP 6525782 A JP6525782 A JP 6525782A JP 6525782 A JP6525782 A JP 6525782A JP S58183893 A JPS58183893 A JP S58183893A
Authority
JP
Japan
Prior art keywords
pump
flow amount
actual
flow rate
multiplier
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
JP6525782A
Other languages
Japanese (ja)
Inventor
Norihisa Suzuki
鈴木　程久
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6525782A priority Critical patent/JPS58183893A/en
Publication of JPS58183893A publication Critical patent/JPS58183893A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine

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)

Abstract

PURPOSE:To enable to obtain the flow amount of the variable speed pump by an operation only without measuring the actual flow amount by a method wherein simple operating units such as a subtractor, a multiplier, a divider and a function generator are combined. CONSTITUTION:The signals of a suction well level meter 2 and a discharging well level meter 3 are inputted into the subtractor 5 in the flow amount operating device 4, and the actual lift HA of the pump may be obtained as the result of the operation. On the other hand, the signal of a tachometer 7 of the pump is inputted into the divider 8 to obtain the value of (100/N; N is revolving number) and, further, the signal is inputted into the function generator 9, having square-law characteristics, to operate the value of (100/N)<2>. The outputs of the function generator 9 and an actual lift operator 5 are outputted to the multiplier 10 and the lift HB of a similar point B upon N=100%, which is corresponding to the operating point A under the revolving number N and the actual lift HA may be obtained. This lift HB is inputted into the function generator 6 having the Q-H characteristics upon N=100% and whereby the flow amount QB may be obtained. Further, a revolving number N is multiplied in the multiplier 12 by a signal passed through the multiplier 11 multiplying 1/100 and whereby the actual flow amount QA may be operated.

Description

【発明の詳細な説明】 本発明は、ポンプ所における流量測定装置に係り、特に
、可変速ポンプの流量を実流量と測定せずポンプ特性か
ら演算により求める装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate measuring device at a pumping station, and particularly to a device that calculates the flow rate of a variable speed pump by calculation from pump characteristics without measuring the actual flow rate.

固定速ポンプの流量を実流ｉｔ測測定ることなく演算で
求める方法を第１図と＠２図で説明する。A method for calculating the flow rate of a fixed speed pump without measuring the actual flow rate will be explained with reference to Figures 1 and 2.

まず第１図でＱ−Ｈ特性を説明する。First, the QH characteristics will be explained with reference to FIG.

固定速ポンプのＱ−Ｈ％性（実揚程臼＃）は、定格回転
数における揚程と流量の関係を示す。The Q-H% (actual head #) of a fixed speed pump indicates the relationship between the head and flow rate at the rated rotation speed.

ポンプの運転点は、ポンプが定格回転数で運転嘔れてい
るかぎ９、この曲線上圧ある。The operating point of the pump is the pressure above this curve when the pump is operating at the rated speed.

したがって、ポンプの実揚程Ｈ１がわかれば、そのとき
のポンプ吐出流量ＱＨ６が、Ｑ−Ｈ％性により求められ
る。Therefore, if the actual head H1 of the pump is known, the pump discharge flow rate QH6 at that time can be determined from the Q-H% property.

次に、この方法で流量を演算で求める装置について属２
図で説明する。Next, regarding the device for calculating the flow rate using this method,
This will be explained with a diagram.

ポンプ！＃′ｉ吸水井２０がら吐出弁３０へと揚水する
もので、吸水井２０の水位を測定する水位計２と、吐出
弁３０の水位を測定する水位計３とが備えられる。pump! #'i Water is pumped from the water intake well 20 to the discharge valve 30, and includes a water level gauge 2 for measuring the water level of the water intake well 20 and a water level gauge 3 for measuring the water level of the discharge valve 30.

この二つの水位計の信号は、流量演算装置４に入力され
る。流量演算装置４は、引算器５と関数発生器６から構
成される。Signals from these two water level gauges are input to the flow rate calculation device 4. The flow rate calculation device 4 is composed of a subtracter 5 and a function generator 6.

引算器５で、吸込水位と吐出水位の差、すなわち実揚程
を演算する。この実揚程を、ポンプのＱ−Ｈ％性の実装
され几関数発生器６に入力することにより、そのときの
流量が求められる。A subtracter 5 calculates the difference between the suction water level and the discharge water level, that is, the actual head. By inputting this actual head into a function generator 6 that implements the Q-H % characteristic of the pump, the flow rate at that time can be determined.

この装置では、ポンプの回転数が変化する場合、回転数
のパターンだけ関数発生器を持っている必要がある。In this device, when the rotational speed of the pump changes, it is necessary to have a function generator for the rotational speed pattern.

しかも、あらゆる回転数でのＱ−Ｈ％性を事前につくっ
ておく必要もあり、演算装置としてはきわめて壺雑なも
のになってしまう。Moreover, it is necessary to prepare the Q-H % properties at all rotational speeds in advance, making the calculation device extremely complicated.

本発明の目的は可変速ポンプの流量を、実流緻をはかる
ことなく演算のみで求められる流を演算装置を提供する
にある。An object of the present invention is to provide a flow calculation device that can determine the flow rate of a variable speed pump only by calculation without calculating the actual flow rate.

本発明の根拠となるポンプ特性についてｊＡ３図で説明
する。The pump characteristics that are the basis of the present invention will be explained using diagram jA3.

ポンプの特性は、回転数Ｎ＝１００％のときのＱ−）（
特性だけがわかるものとする。しかし、ポンプの回転数
Ｎは任意に変化する。このとさ、ポンプの実揚程Ｈムと
回転数Ｎからポンプの吐出流量を求める方法を示す。The characteristics of the pump are Q-)( when the rotation speed N=100%
It is assumed that only the characteristics are known. However, the rotation speed N of the pump can be changed arbitrarily. Now, we will show how to obtain the pump discharge flow rate from the pump's actual pump head Hm and rotation speed N.

第３図で、Ａ点（回転数Ｎの運転点）とＢ点（Ａ点圧対
するＱ−Ｈ特性のうえの相似点）との間には、 Ｑｌ　１００ という関係式が成り几つ。In FIG. 3, the relational expression Ql 100 holds true between point A (the operating point at rotational speed N) and point B (the point of similarity on the Q-H characteristic for the pressure at point A).

（１１式から である。この式により、回転数Ｎで実揚程がＨムのとき
の運転点Ａ点に対応するＮ４１００％のときの相似点Ｂ
の揚程Ｈａが求められる。(From formula 11. According to this formula, the similar point B when N4100% corresponds to the operating point A when the rotation speed N and the actual head is Hm.
The lifting height Ha is calculated.

Ｂ点の揚程ＨｍからＢ点のｉ＃Ｑ、を求めることは、Ｈ
ｌとＮ＝１００％のときのＱ−Ｈ％性からできる。さら
Ｋ（２）式から であるから、Ａ点の流量Ｑムが求められる。To find i#Q at point B from the lifting head Hm at point B, H
This can be done from the Q-H% property when l and N=100%. Furthermore, since it is from equation K (2), the flow rate Q at point A can be determined.

特性図上では以上の手順により、回転数Ｎとそのときの
実揚程Ｈム及びＮ＝ｉ００％のときのＪＱＨ％性から、
ポンプ流量が求まる。On the characteristic diagram, according to the above procedure, from the rotation speed N, the actual head Hm at that time, and the JQH% when N=i00%,
Find the pump flow rate.

尚、Ｎ＝　１００％なら実揚程Ｈムのときの流量がＱｌ
となることはいうまでもない。Furthermore, if N = 100%, the flow rate when the actual head is H is Ql.
It goes without saying that.

本発明の一実施例を第４図に示す。An embodiment of the present invention is shown in FIG.

吸込弁水位計２と吐出井水位計３の信号は、流量演算装
置４の中の引算器５に入力され、その演算結果としてポ
ンプ実揚程Ｈムが求められる。The signals from the suction valve water level gauge 2 and the discharge well water level gauge 3 are input to a subtracter 5 in the flow rate calculation device 4, and the actual pump head Hm is determined as a result of the calculation.

一方、ポンプの回転計７の信号は除算器８での関数発生
器９の出力と、実揚程演算器５の出力は乗算器ｌＯ忙大
入力れ、Ｈｍが求められる。On the other hand, the signal of the pump tachometer 7 is inputted to the output of the function generator 9 in the divider 8, and the output of the actual head calculation unit 5 is inputted to the multiplier lO, and Hm is determined.

このＨｍ　ｆＮ＝１００％のＱ−Ｈ％性の関数発生器６
に入力することでＱｌｌが求めらｔｌさらに、号と乗算
器１２で掛けあわせることで流量ＱＡが演算される。This Hm fN=100% Q-H% function generator 6
Qll is obtained by inputting tl, and the flow rate QA is calculated by multiplying tl by the multiplier 12.

本発明によれば、引算器１乗算器、除算器及び関数発生
器という簡単な演算器の組み合わせにより、可変速ポン
プの流量を測定することができる。According to the present invention, the flow rate of a variable speed pump can be measured using a simple combination of arithmetic units including a subtracter 1 multiplier, a divider, and a function generator.

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

第１図は固定速ポンプ特性ダ、第２図は従来の固定速ポ
ンプ流量演算装置の系統図、第３図ＦｉβＩ変速ポンプ
の特性図、第４図は本発明による可変速ポンプ流量演算
装菅の系統図である。 １・・・可変速ポンプ、２・・・吸込弁水位計、３・・
・吐出井水位計、４・・・流量演算装置、５・・・引算
器、６゜９・・・関数発生器、７・−・回転計、８・・
・除算器、１０〜１２・・・乗算器。 草Ｉ　目 αＨａ。 ａ□ （減量） Ｊ！！２　　目 茅３　目 ＱＡ、ＱＢＱｔ　　　α− く多気量　） 第　４　口Fig. 1 shows the characteristics of a fixed speed pump, Fig. 2 shows a system diagram of a conventional fixed speed pump flow rate calculation device, Fig. 3 shows a characteristic diagram of a FiβI variable speed pump, and Fig. 4 shows a variable speed pump flow rate calculation device according to the present invention. This is a system diagram of 1... Variable speed pump, 2... Suction valve water level gauge, 3...
・Discharge well water level meter, 4...Flow rate calculation device, 5...Subtractor, 6゜9...Function generator, 7...Tachometer, 8...
- Divider, 10 to 12... Multiplier. Grass I order αHa. a□ (weight loss) J! ! 2nd eye, 3rd eye QA, QBQt α- 4th mouth

Claims (1)

【特許請求の範囲】[Claims] １、回転数計測装置とポンプの揚程を検出するだめの計
測装暗とを備えた可変速ポンプにおいて、関数発生器１
乗算器、除算器、加減算器の組み合せから、そのポンプ
の吐出流量１を演算により求めることを％徴とする可変
速ポンプの流量演算装置。1. In a variable speed pump equipped with a rotation speed measuring device and a measuring device for detecting the head of the pump, the function generator 1
A flow rate calculation device for a variable speed pump whose percentage function is to calculate the discharge flow rate 1 of the pump from a combination of a multiplier, a divider, and an adder/subtractor.
JP6525782A 1982-04-21 1982-04-21 Flow amount operating device for variable speed pump Pending JPS58183893A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6525782A JPS58183893A (en) 1982-04-21 1982-04-21 Flow amount operating device for variable speed pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6525782A JPS58183893A (en) 1982-04-21 1982-04-21 Flow amount operating device for variable speed pump

Publications (1)

Publication Number Publication Date
JPS58183893A true JPS58183893A (en) 1983-10-27

Family

ID=13281673

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6525782A Pending JPS58183893A (en) 1982-04-21 1982-04-21 Flow amount operating device for variable speed pump

Country Status (1)

Country Link
JP (1) JPS58183893A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62165597A (en) * 1986-01-16 1987-07-22 Toshiba Corp Flow rate detecting method for variable-speed pump
EP0652374A1 (en) * 1993-10-21 1995-05-10 Ebara Corporation System for controlling operation of turbo type fluid machinery
CN102878091A (en) * 2012-10-11 2013-01-16 江苏大学 Method for determining centrifugal pump full-condition theoretical lifts based on internal flow measurement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62165597A (en) * 1986-01-16 1987-07-22 Toshiba Corp Flow rate detecting method for variable-speed pump
EP0652374A1 (en) * 1993-10-21 1995-05-10 Ebara Corporation System for controlling operation of turbo type fluid machinery
CN102878091A (en) * 2012-10-11 2013-01-16 江苏大学 Method for determining centrifugal pump full-condition theoretical lifts based on internal flow measurement

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