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WO2005064167A1 - Mesure de quantites - Google Patents

Mesure de quantites Download PDF

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Publication number
WO2005064167A1
WO2005064167A1 PCT/EP2004/012674 EP2004012674W WO2005064167A1 WO 2005064167 A1 WO2005064167 A1 WO 2005064167A1 EP 2004012674 W EP2004012674 W EP 2004012674W WO 2005064167 A1 WO2005064167 A1 WO 2005064167A1
Authority
WO
WIPO (PCT)
Prior art keywords
centrifugal pump
calibration curve
differential pressure
measurement
actual
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.)
Ceased
Application number
PCT/EP2004/012674
Other languages
German (de)
English (en)
Inventor
Rolf Witzel
Stephan Bross
Michael Nutz
Dirk Kollmar
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.)
KSB AG
Original Assignee
KSB AG
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 KSB AG filed Critical KSB AG
Publication of WO2005064167A1 publication Critical patent/WO2005064167A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F04D15/0088—Testing machines

Definitions

  • the invention relates to a centrifugal pump with one or more pressure transducers for detecting a differential pressure generated by the centrifugal pump and an evaluation unit for determining a flow rate indication from a differential pressure, the centrifugal pump being provided with a drive means and a device for detecting an absorbed power (P).
  • a delivery rate is derived from the values of a QH diagram, in which the delivery head is plotted against the delivery quantity, or a QP diagram, in which the power is plotted against the delivery quantity, this is difficult in those cases where a flat flow rate is shown or there is a non-continuously increasing QH characteristic or QP characteristic.
  • DE 199 31 961 A1 discloses a method for regulating a delivery quantity of a pump, the pump being driven by an electric motor controlled by a frequency converter.
  • the input power (P) of the motor is measured as an actual value for the delivery quantity of the pump and regulated by comparison with a stored setpoint (P S oi ⁇ ).
  • a change in the motor temperature (T) by a corresponding compensation quantity in the sense of a correction of the input power (P) is taken into account in the control.
  • a compensation variable can be called up from an empirically created, stored table of associated input power change values and temperature values of the engine as a function of the respective operating temperature of the engine.
  • the input power of the motor represents the corresponding measure for the actual value of the delivery quantity, which must then be compensated for by the temperature value.
  • the aim of DE 19931 961 A1 is accordingly to readjust a delivery quantity, here primarily the delivery pressure, taking into account the input power (P) as a measurement quantity without explicitly specifying the current delivery quantity.
  • the invention is based on the problem of developing a safe pump-internal quantity measurement for a pump, which ensures a high level of accuracy and at any time about the respective volume flow conveyed by the pump over the entire volume flow range and also with large volume flows.
  • X Ca ⁇ is added at the respective time of calibration, parallel to the detection of the respective pressure difference ⁇ p ca ⁇ , that of the pump or pump and Drive means or only power P ca ⁇ recorded by the drive means. This takes place when the pump characteristic curve is completely shut down.
  • the invention also eliminates the additional problem of being able to predict a volume flow in the case of centrifugal pumps on the basis of not continuously increasing, falling or too flat delivery head or performance characteristics.
  • the calibration curve f (Q ca ⁇ ) is designed to be steadily increasing and that its continuously increasing course is independent of the actual QH curves of a circular pump, which have different slopes and courses.
  • a previously known direct determination of an instantaneous volume flow from the determined delivery heights or output curves has the disadvantage that in addition to the pressure differences or outputs, the density of a delivery medium must always be known or additionally determined. Since the density is in turn temperature-dependent, a temperature measurement must also be carried out. However, both variables, density and temperature, are not according to the invention required because the density is reduced as an influencing variable when forming the quotient.
  • Embodiments of the invention provide that the drive means is designed as an electric motor, that the drive means is designed to be speed-controllable, or that a speed measurement is carried out at the same time.
  • the drive means with variable speed, there is the possibility of expanding the determined calibration curve using a simple conversion by the affinity laws to a calibration curve field or explicit measurement of the same during a metrological acceptance test of the circular pump.
  • a calibration curve belonging to the respective speed is determined from a stored calibration curve field during operation with simultaneous speed measurement values and the respective volume flow is thus determined.
  • a centrifugal pump or its installation location is equipped with a device for differential pressure detection, which makes it possible to determine the current static delivery head. Furthermore, the drive means of the centrifugal pump has a device for detecting the drive power consumed in the respective operating state and at the moment.
  • the calibration curve is determined by acquiring the curves of the differential pressure ⁇ p ca ⁇ and the power P ca ⁇ consumed at the respective operating point and using equation [3] f (Qcai) and / or their values are determined and stored in a memory element as a function of P ca ⁇ / ⁇ p ca ⁇ .
  • the values of Pi S t / ⁇ pi St are determined from the differential pressures ⁇ pis t continuously measured during operation and the associated respective drive powers Pi st recorded in parallel therewith at the same operating points.
  • the comparison of these measured values recorded during operation with the values of the respectively stored calibration curve f (Q ca ⁇ ) results in the simplest way the associated flow rate Qj S t of the centrifugal pump at the time Xj S t.
  • a differential pressure ⁇ p generated by the centrifugal pump is recorded with one or more pressure transducers, the centrifugal pump having an evaluation unit for determining a delivery quantity specification Q from a differential pressure ⁇ p and the centrifugal pump with a drive means and a device for Detection of an input power P is provided.
  • a total of five curves are plotted in the upper part of the diagram, which show the delivery height H in relation to a delivery quantity Q.
  • the middle curve H1 on which several measuring points marked with x are plotted, corresponds to an operation at nominal speed.
  • the points of these other curves are each represented by different graphic symbols in the form of +, O, D, ⁇ .
  • the corresponding power curves P are plotted in the middle part of the diagram.
  • the mean power curve P1 corresponds to the power consumed for curve H1.
  • the two other performance curves arranged above and below behave analogously to the curves of the head H at different drive speeds.
  • the performance shown here curves represent an unfavorable case and show an uneven course. An attempt to determine the quantity using conventional means would lead to different quantities.
  • the calibration curve f (Q ca ⁇ ) determined according to the invention is shown. It results from the function according to equation [3] above.
  • the corresponding values of such a calibration curve are stored in a measuring and / or regulating device of a centrifugal pump which is known per se.
  • the respective data of Pj S t and ⁇ pist are recorded at any or desired point in time Xjs t and the delivery quantity Qj St is determined in accordance with the relationship in the associated calibration curve f (Q ca ⁇ ).
  • Such an evaluation procedure is shown in the diagram by a dashed and arrowed line.
  • ⁇ p ca ⁇ pressure difference measured when a centrifugal pump is removed
  • ⁇ pi St pressure increase of the pump at the time of measurement, pressure difference

Landscapes

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

Abstract

La présente invention concerne une pompe centrifuge comprenant un ou plusieurs capteurs de pression destinés à détecter une pression différentielle (<p) produite par la pompe centrifuge, et une unité d'évaluation destinée à fournir une indication de quantité transportée (Q) à partir d'une pression différentielle (?p). La pompe centrifuge comprend un système d'entraînement et un dispositif qui sert à détecter une puissance absorbée (P), les résultats de mesure de la pression différentielle ?pcal et d'une puissance Pcal au même point de fonctionnement, étant utilisés pour constituer une courbe de calibrage f(Qcal) spécifique de la pompe, selon une fonction f(Qcal) = Pcal/?pcal = Qcal/?cal, ladite courbe étant enregistrée dans l'unité d'évaluation. Au cours du fonctionnement de la pompe, a lieu, pour un point de fonctionnement respectif, à partir des valeurs de mesure prises, d'une puissance réelle Pist pour une pression différentielle réelle ?pist correspondante, un alignement de ces valeurs de mesure réelles avec des données enregistrées de la courbe de calibrage f(Qcal), et une valeur d'alignement détermine le débit (Qist) à l'instant réel de la mesure.
PCT/EP2004/012674 2003-12-19 2004-11-10 Mesure de quantites Ceased WO2005064167A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10359726A DE10359726A1 (de) 2003-12-19 2003-12-19 Mengenmessung
DE10359726.3 2003-12-19

Publications (1)

Publication Number Publication Date
WO2005064167A1 true WO2005064167A1 (fr) 2005-07-14

Family

ID=34672911

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/012674 Ceased WO2005064167A1 (fr) 2003-12-19 2004-11-10 Mesure de quantites

Country Status (2)

Country Link
DE (1) DE10359726A1 (fr)
WO (1) WO2005064167A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010133425A1 (fr) 2009-05-20 2010-11-25 Ksb Aktiengesellschaft Procédé et dispositif de détermination d'un point de fonctionnement d'une machine de travail
US7925385B2 (en) 2006-03-08 2011-04-12 Itt Manufacturing Enterprises, Inc Method for optimizing valve position and pump speed in a PID control valve system without the use of external signals
US7945411B2 (en) 2006-03-08 2011-05-17 Itt Manufacturing Enterprises, Inc Method for determining pump flow without the use of traditional sensors
DE102007010768B4 (de) * 2006-03-08 2012-03-29 Itt Manufacturing Enterprises, Inc. Verfahren für die Optimierung der Ventilstellung und der Pumpendrehzahl in einem Ventilsystem mit PID-Regelung ohne die Verwendung externer Signale
DE102007009301B4 (de) * 2006-03-08 2012-03-29 Itt Manufacturing Enterprises, Inc. Verfahren und Vorrichtung zum Pumpenschutz ohne den Einsatz traditioneller Sensoren
DE102007009302B4 (de) * 2006-03-08 2012-04-05 Itt Manufacturing Enterprises, Inc. Verfahren zum Bestimmen des Pumpendurchflusses ohne den Einsatz traditioneller Sensoren
US8303260B2 (en) 2006-03-08 2012-11-06 Itt Manufacturing Enterprises, Inc. Method and apparatus for pump protection without the use of traditional sensors
WO2014089693A1 (fr) 2012-12-12 2014-06-19 S. A. Armstrong Limited Système de commande coordonnée exempt de capteur
DE102014214033A1 (de) 2014-07-18 2016-01-21 Ksb Aktiengesellschaft Bestimmung des Förderstroms einer Pumpe
EP2039939B1 (fr) 2007-09-20 2017-08-09 Grundfos Management A/S Procédé de surveillance d'un dispositif de transformation d'énergie
US9897084B2 (en) 2013-07-25 2018-02-20 Fluid Handling Llc Sensorless adaptive pump control with self-calibration apparatus for hydronic pumping system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008027039B8 (de) * 2008-06-06 2012-02-02 Aic-Regloplas Gmbh Temperiergerät mit Durchflussmessung
WO2011131214A1 (fr) * 2010-04-22 2011-10-27 Rippert Besitzgesellschaft Mbh & Co. Kg Procédé et dispositif pour déterminer le flux volumique
EP2505845B1 (fr) 2011-03-29 2021-12-08 ABB Schweiz AG Procédé pour améliorer la précision de l'estimation du débit sans capteur d'une pompe commandée par un convertisseur de fréquence
DE102015215466A1 (de) 2015-08-13 2017-02-16 Ksb Aktiengesellschaft Einstellung des Förderstroms eines Verbrauchers
US11047378B2 (en) 2017-07-21 2021-06-29 Carlisle Fluid Technologies, Inc. Systems and methods for pump slip sensing

Citations (2)

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Publication number Priority date Publication date Assignee Title
WO1989002581A1 (fr) * 1987-09-15 1989-03-23 Ilmaterä Oy Dispositif de mesure de flux volumique d'un ventilateur
WO1997024596A1 (fr) * 1995-12-27 1997-07-10 A. Ahlström Osakeyhtiö Procede et dispositif servant a determiner des variables physiques d'une boue ou d'un liquide

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US4821580A (en) * 1988-01-27 1989-04-18 Jorritsma Johannes N Method and apparatus for calculating flow rates through a pumping station
US5129264A (en) * 1990-12-07 1992-07-14 Goulds Pumps, Incorporated Centrifugal pump with flow measurement
DE4330097A1 (de) * 1993-09-06 1995-03-09 Klein Schanzlin & Becker Ag Kreiselpumpengehäuse mit Fördermengenmeßeinrichtung
DE19931961A1 (de) * 1999-07-12 2001-02-01 Danfoss As Verfahren zur Regelung einer Fördergröße einer Pumpe
DE10039917A1 (de) * 2000-08-16 2002-02-28 Ksb Ag Verfahren und Vorrichtung zur Ermittlung der Fördermenge einer Kreiselpumpe
US6536271B1 (en) * 2001-09-13 2003-03-25 Flowserve Management Company Pump with integral flow monitoring

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989002581A1 (fr) * 1987-09-15 1989-03-23 Ilmaterä Oy Dispositif de mesure de flux volumique d'un ventilateur
WO1997024596A1 (fr) * 1995-12-27 1997-07-10 A. Ahlström Osakeyhtiö Procede et dispositif servant a determiner des variables physiques d'une boue ou d'un liquide

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7925385B2 (en) 2006-03-08 2011-04-12 Itt Manufacturing Enterprises, Inc Method for optimizing valve position and pump speed in a PID control valve system without the use of external signals
US7945411B2 (en) 2006-03-08 2011-05-17 Itt Manufacturing Enterprises, Inc Method for determining pump flow without the use of traditional sensors
DE102007010768B4 (de) * 2006-03-08 2012-03-29 Itt Manufacturing Enterprises, Inc. Verfahren für die Optimierung der Ventilstellung und der Pumpendrehzahl in einem Ventilsystem mit PID-Regelung ohne die Verwendung externer Signale
DE102007009301B4 (de) * 2006-03-08 2012-03-29 Itt Manufacturing Enterprises, Inc. Verfahren und Vorrichtung zum Pumpenschutz ohne den Einsatz traditioneller Sensoren
DE102007009302B4 (de) * 2006-03-08 2012-04-05 Itt Manufacturing Enterprises, Inc. Verfahren zum Bestimmen des Pumpendurchflusses ohne den Einsatz traditioneller Sensoren
US8303260B2 (en) 2006-03-08 2012-11-06 Itt Manufacturing Enterprises, Inc. Method and apparatus for pump protection without the use of traditional sensors
EP2039939B1 (fr) 2007-09-20 2017-08-09 Grundfos Management A/S Procédé de surveillance d'un dispositif de transformation d'énergie
DE102009022107A1 (de) 2009-05-20 2010-11-25 Ksb Ag Verfahren und Vorrichtung zur Betriebspunktbestimmung einer Arbeitsmaschine
WO2010133425A1 (fr) 2009-05-20 2010-11-25 Ksb Aktiengesellschaft Procédé et dispositif de détermination d'un point de fonctionnement d'une machine de travail
US8763464B2 (en) 2009-05-20 2014-07-01 Ksb Aktiengesellschaft Method and apparatus for determining an operating point of a work machine
US11531309B2 (en) 2012-12-12 2022-12-20 S.A. Armstrong Limited Self learning control system and method for optimizing a consumable input variable
US11740595B2 (en) 2012-12-12 2023-08-29 S.A. Armstrong Limited Co-ordinated sensorless control system
US9823627B2 (en) 2012-12-12 2017-11-21 S.A. Armstrong Limited Self learning control system and method for optimizing a consumable input variable
US9829868B2 (en) 2012-12-12 2017-11-28 S.A. Armstrong Limited Co-ordinated sensorless control system
US12228892B2 (en) 2012-12-12 2025-02-18 S.A. Armstrong Limited Self learning control system and method for optimizing a consumable input variable
US11960252B2 (en) 2012-12-12 2024-04-16 S.A. Armstrong Limited Co-ordinated sensorless control system
US10429802B2 (en) 2012-12-12 2019-10-01 S.A. Armstrong Limited Self learning control system and method for optimizing a consumable input variable
US10466660B2 (en) 2012-12-12 2019-11-05 S.A. Armstrong Limited Co-ordinated sensorless control system
US10948882B2 (en) 2012-12-12 2021-03-16 S.A. Armstrong Limited Self learning control system and method for optimizing a consumable input variable
US11009838B2 (en) 2012-12-12 2021-05-18 S.A. Armstrong Limited Co-ordinated sensorless control system
EP3869282A1 (fr) 2012-12-12 2021-08-25 S. A. Armstrong Limited Système de commande autodidacte et procédé d'optimisation d'une variable d'entrée consommable
WO2014089693A1 (fr) 2012-12-12 2014-06-19 S. A. Armstrong Limited Système de commande coordonnée exempt de capteur
US11550271B2 (en) 2012-12-12 2023-01-10 S.A. Armstrong Limited Co-ordinated sensorless control system
US11953864B2 (en) 2012-12-12 2024-04-09 S.A. Armstrong Limited Self learning control system and method for optimizing a consumable input variable
US11740594B2 (en) 2012-12-12 2023-08-29 S.A. Armstrong Limited Self learning control system and method for optimizing a consumable input variable
US9897084B2 (en) 2013-07-25 2018-02-20 Fluid Handling Llc Sensorless adaptive pump control with self-calibration apparatus for hydronic pumping system
DE102014214033A1 (de) 2014-07-18 2016-01-21 Ksb Aktiengesellschaft Bestimmung des Förderstroms einer Pumpe
US10352324B2 (en) 2014-07-18 2019-07-16 Ksb Aktiengesellschaft Determining the delivery rate of a pump

Also Published As

Publication number Publication date
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