WO2009006927A1 - Procédé en vue d'éviter le fonctionnement à sec d'une pompe centrifuge, module de surveillance de pompe et système - Google Patents

Procédé en vue d'éviter le fonctionnement à sec d'une pompe centrifuge, module de surveillance de pompe et système Download PDF

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Publication number
WO2009006927A1
WO2009006927A1 PCT/EP2007/006351 EP2007006351W WO2009006927A1 WO 2009006927 A1 WO2009006927 A1 WO 2009006927A1 EP 2007006351 W EP2007006351 W EP 2007006351W WO 2009006927 A1 WO2009006927 A1 WO 2009006927A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
centrifugal pump
monitoring module
value
electric motor
Prior art date
Application number
PCT/EP2007/006351
Other languages
German (de)
English (en)
Inventor
Herbert Grieb
Dieter-Heinz Hellmann
Helmut Henzler
Karl-Heinz Kirchberg
Thomas MÜLLER-HEINZERLING
Bernd-Markus Pfeiffer
Simon Schneider
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/EP2007/006351 priority Critical patent/WO2009006927A1/fr
Publication of WO2009006927A1 publication Critical patent/WO2009006927A1/fr

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
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
    • F04D15/0236—Lack of liquid level being detected by analysing the parameters of the electric drive, e.g. current or power consumption

Definitions

  • the invention relates to a method for monitoring a driven by an electric motor centrifugal pump to prevent dry running and a Pumpenuberwachungsbaustein and an arrangement.
  • a centrifugal pump is a flow machine, wherein a Fordermedium, usually a liquid, is moved by means of a rotating impeller. Through a access line (pipe) entering Fordermedium is entrained by the rotating impeller, i. radially accelerated. The accelerated delivery medium then exits via a drain line from the centrifugal pump.
  • the drive of the centrifugal pump is usually carried out by an electric motor.
  • centrifugal pumps mechanical seals are used to seal the rotating shaft against the centrifugal pump housing.
  • the liquid Fordermedium takes over in centrifugal pumps in particular the function of cooling the mechanical seals. Therefore, a sufficient amount of liquid Fordermedium is always required for the operation of centrifugal pumps to avoid overheating of the mechanical seals and possibly other centrifugal pump components and thus damage to the centrifugal pump.
  • the object is achieved by a method for monitoring a centrifugal pump driven by an electric motor for avoidance of dry running,
  • the pump monitoring module compares the value from b) with a real power or load current reference value, which represents a sufficient amount of liquid Fordermedium in the centrifugal pump,
  • the pump monitoring module interprets this condition as dry running.
  • a pump monitoring module which is designed to be connected to an electric motor driving a centrifugal pump via an engine control unit for monitoring the centrifugal pump driven by the electric motor to avoid dry running, in which case there is a connection
  • the pump monitoring module can evaluate the active power measured by the motor control unit or the measured load current of the electric motor when starting up the centrifugal pump,
  • the pump monitoring module can compare the evaluated value from a) with a real power or load current reference, which represents a sufficient amount of liquid Fordermedium in the centrifugal pump,
  • the object is further characterized by an arrangement comprising a Pumpenuberwachungsbaustein, which with a a
  • the pump monitoring module evaluates the active power measured by the engine control unit or the measured load current of the electric motor when starting up the centrifugal pump,
  • the pump monitoring module compares the evaluated value from a) with a real power or load current reference, which represents a sufficient amount of liquid Fordermedium in the centrifugal pump,
  • the pump monitoring module interprets this condition as dry running.
  • the method is further developed in that the pump monitoring module throttles or shuts off the electric motor.
  • the pump monitoring module throttles or shuts off the electric motor.
  • FIG. 2 shows a typical measuring diagram which shows the active power over time for the case of dry running and in the case of a sufficient supply of the
  • FIG. 1 shows a pump monitoring structure in a PUB, which has an evaluation unit AE, a memory SP connected to the evaluation unit AE, and one with the evaluation unit
  • the pump monitoring module PUB is connected to a motor module MBS.
  • the pump monitoring module PUB and the motor module MBS are part of a process control system, for example a Simatic PCS7.
  • An engine control unit MSTG is compatible with the engine MBS, the evaluation unit AE of Pumpenüberwachungsbau- stone PUB and connected to the electric motor M.
  • the electric motor M drives the centrifugal pump P.
  • the centrifugal pump P is supplied with liquid Fordermedium via the supply line ZL and pumps the Fordermedium via the drain line AL out.
  • a flow sensor S for measuring the volume flow is attached, which passes measured data to the evaluation unit AE of the pump monitoring module PUB. Bidirectional traffic between these components is illustrated by double arrows and unidirectional traffic between the named components by simple arrows in the direction of the arrow.
  • the power data of the electric motor M are continuously detected by the motor control unit MSTG and forwarded to the evaluation unit AE of the pump monitoring module PUB.
  • These performance data include in particular the active power and / or the load current of the electric motor M. Since the motor voltage is largely constant, the course of the active power and the load current in the operation of centrifugal pumps is substantially uniform. It is therefore sufficient to supply one of the two parameters to the evaluation unit AE. Also, the value of the active power or the
  • the invention is described for a supplied active power value, but it can also be carried out for a supplied load current value.
  • the evaluation unit AE of the pump monitoring module PUB the supplied active power value described above is compared with an active power reference value which represents a sufficient amount of liquid Fordermedium in the centrifugal pump P.
  • This active power reference value is determined in each case for a specific centrifugal pump P experimentally supplying the centrifugal pump P with sufficient amount of liquid Fordermedium or theoretically from known technical data of the electric motor M, such as torque of the electric motor M, moment of inertia of the rotor of the electric motor M and the coupling unit between the electric motor M and centrifugal pump P and calculated from known technical data of the centrifugal pump P, such as moment of inertia of the impeller of the centrifugal pump P and the mass of the liquid Fordermedium.
  • US Pat. No. 6,260,004 B1 shows a method for calculating power curves from technical performance data of an electric motor driving a centrifugal pump, the centrifugal pump and the liquid medium used, as well as a method for converting and evaluating measured electrical variables and their comparison with the calculated reference values ,
  • the active power reference values used in the evaluation unit AE for comparison with the determined effective power of the electric motor M are stored in the memory SP.
  • the evaluation unit AE determines that the determined active power value deviates unacceptably in relation to the active power reference, ie, falls below defined threshold values, this deviation is interpreted as the presence of dry running and the evaluation unit AE will instruct the engine control unit MSTG in this case. to throttle the electric motor M or even shut it off completely in order to Heat of the mechanical seals of the centrifugal pump P to avoid.
  • the signal curves or the interpreted state of the dry run are displayed on the input / output unit EA of the pump monitoring module PUB and possibly an alarm message is output.
  • the physical-technical reason for a detected unacceptable deviation between a determined active power value and a real power reference value is due to the fact that in the case of dry running or insufficient supply of the centrifugal pump P with liquid Fordermedium that liquid Fordermedium or its mass must be mitbelectt.
  • the electric motor M has to apply an additional power for this, which is reflected in an increased compared to the state of dry running active power value. Conversely, if there is no liquid Fordermedium in the centrifugal pump P, the electric motor M requires less power to start the centrifugal pump P, which is expressed by a low determined active power value.
  • FIG. 2 shows a typical measuring diagram which represents the active power over time for the case of dry running (dotted line) and for the case of sufficient supply of the liquid medium to the centrifugal pump (solid line).
  • the Y-axis shows the measured active power or the measured load current. The time is shown on the X-axis.
  • the impeller of the centrifugal pump P is thereby accelerated to a speed which is well below the rated speed, ie that speed which is required for continuous operation under full load of the centrifugal pump P. At these lower speeds, damage to slip gaskets will occur even in dry conditions. run avoided. If a permissible operating behavior is determined, the speed can then be switched to continuous operation.
  • the electric motor M is turned on at the time Tl. After switching on the electric motor M, ie between the times Tl and T2, the electric motor M requires a high active power, since he must mitbeuggen the liquid medium in the centrifugal pump P (rising edge). Between the times T2 and T3, the electric motor has reached its maximum effective power (maxima) and after the impeller in the centrifugal pump P has accelerated sufficiently, the active power is again smaller (period between T3 and T4). After the time T4, a state of continuous operation with partial load (low speed) of the centrifugal pump P is achieved in the centrifugal pump P with sufficient existing liquid Fordermedium.
  • the course of the measured active power in dry running over time is similar to and between the respective times Tl to T4 the course with sufficient existing liquid Fordermedium in the centrifugal pump P. However, at the respective times T2 to T4 and between the times Tl to T4 and after T4 measured much lower active power values.
  • the evaluation by the evaluation unit AE could also be accelerated.
  • measured values of active power are recorded every 100 ms.
  • time interval of 500 ms between Tl and T2 i. Within the rising flank, you can thus identify significant deviations and use them for evaluation. This measurement and evaluation method thus reacts extremely quickly to impermissible operating states, in particular when starting up the centrifugal pump P.
  • the individual parameters must each be determined or calculated in advance depending on the system. Nevertheless, the method offers the possibility centrifugal pumps P already within the first second after switching off again to prevent the destruction of the centrifugal pump P.
  • the described method is implemented as a sort of pretest. If no dry run is detected during the pre-test, the centrifugal pump P is then accelerated up to nominal speed (not shown here).
  • the electric motor M can be designed with devices known from the prior art, such as a star-delta circuit, a soft-start device or a frequency converter with ramp function.
  • the described comparison between determined active power values and active power reference values also makes it possible to detect heavy-duty starting of the centrifugal pump P after a long standstill and in continuous operation of the centrifugal pump P.
  • centrifugal pumps P and their process control system PLS anyway have different components, such as engine component MBS, engine control unit MSTG, liquid sensor S in the outflow line AL of the centrifugal pump P and record active power data anyway.
  • engine component MBS engine component MBS
  • engine control unit MSTG engine control unit MSTG
  • liquid sensor S in the outflow line AL of the centrifugal pump P record active power data anyway.
  • the monitoring method can still be extended if, in addition, the flow in the outflow line AL of the centrifugal pump P during startup of the centrifugal pump P is determined, then the determined flow value or a value derived therefrom is supplied to the evaluation unit AE of the pump monitoring module PUB and then the evaluation unit unit AE of the pump monitoring module PUB the above compares designated flow value with a flow reference value representing a sufficient amount of liquid Fordermedium in the centrifugal pump P and finally in the case that the deviation of the flow value with respect to the flow reference value falls below a predetermined threshold, the pump monitoring module PUB interpreted this state as dry running.
  • This measure represents, so to speak, a double protection, in addition to the described based on the comparison of performance data of the electric motor M method to perform a rapid detection and avoidance of dry running when starting the centrifugal pump P. Again, no additional Flusstechniksgrenz- switch is needed because the flow sensor S is already present in the drain line AL.
  • the pump monitoring module PUB can also be embodied within the engine module MBS.
  • the motor module MBS is not absolutely necessary for the invention, but is usually present in process control systems PLS. It is also not essential to the invention in which component the evaluation of the active power values or active power reference values takes place.
  • the evaluation unit AE and / or the memory SP could also be arranged outside the pump monitoring module PUB, in which case evaluation unit AE or memory SP must of course be connected to the pump monitoring module PUB.
  • there may be two separate, structurally separated evaluation units namely a first evaluation unit for the evaluation of the active power values or active power reference values and a second evaluation unit Evaluation unit for the evaluation of the flow values or
  • the switching on or off of the centrifugal pump P can also take place at an operating unit of the engine component MBS, at another location in the process control system PLS or at another component.
  • tasks for controlling the electric motor M can also be implemented in the pump monitoring module PUB.
  • a deviation of the active power value or load current reference value in relation to the active power or load current reference value is also to be encompassed by the invention. After predetermined inversion of the electrical signals to be evaluated, the defined threshold is exceeded and the pump monitoring module PUB interprets this state as dry running.

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

Abstract

L'invention concerne un procédé destiné à éviter le fonctionnement à sec d'une pompe centrifuge (P), un module de surveillance de pompe (PÜB) et un système. Pour détecter et éviter qu'une pompe centrifuge (P) entraînée par un moteur électrique (M) fonctionne à sec, l'invention propose une solution technique qui n'impose pas l'utilisation d'une sonde supplémentaire de liquide, a) dans laquelle la puissance délivrée ou le courant de charge du moteur électrique (M) lors du démarrage de la pompe centrifuge (P) est déterminé, b) la valeur déterminée à partir de a) ou une valeur qui en est dérivée est amenée à un module (PÜB) de surveillance de pompe, c) le module (PÜB) de surveillance de pompe compare la valeur obtenue en b) à une valeur de référence de la puissance délivrée ou du courant de charge qui représente une quantité suffisante de fluide liquide de transport dans la pompe centrifuge (P) et d) au cas où l'écart entre la valeur obtenue en b) par rapport à la valeur de référence de puissance délivrée ou de courant de charge n'atteint pas une valeur de seuil définie, le module (PÜB) de surveillance de pompe interprète cette situation comme étant un fonctionnement à sec.
PCT/EP2007/006351 2007-07-11 2007-07-11 Procédé en vue d'éviter le fonctionnement à sec d'une pompe centrifuge, module de surveillance de pompe et système WO2009006927A1 (fr)

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PCT/EP2007/006351 WO2009006927A1 (fr) 2007-07-11 2007-07-11 Procédé en vue d'éviter le fonctionnement à sec d'une pompe centrifuge, module de surveillance de pompe et système

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PCT/EP2007/006351 WO2009006927A1 (fr) 2007-07-11 2007-07-11 Procédé en vue d'éviter le fonctionnement à sec d'une pompe centrifuge, module de surveillance de pompe et système

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2151580A1 (fr) * 2008-08-05 2010-02-10 Ksb S.A.S Contrôle de fonctionnement d'un groupe motopompe
DE102010039531A1 (de) 2010-08-19 2012-02-23 Siemens Aktiengesellschaft Verfahren zur sicherheitsgerichteten Überwachung einer von einem Elektromotor angetriebenen Kreiselpumpe im ATEX-Bereich sowie Kreiselpumpensystem für den ATEX-Bereich
EP2500579A1 (fr) 2011-03-17 2012-09-19 Siemens Aktiengesellschaft Détection de la cavitation et de l'entraînement de gaz dans une pompe électrique centrifuge
WO2012062650A3 (fr) * 2010-11-11 2013-05-10 Grundfos Holding A/S Ensemble pompe
WO2015192955A1 (fr) * 2014-06-18 2015-12-23 Wilo Se Procédé permettant d'identifier une marche à sec d'une pompe centrifuge
DE102017004097A1 (de) * 2017-04-28 2018-10-31 Wilo Se Verfahren zur Detektion eines abnormalen Betriebszustands eines Pumpenaggregats
DE102014218786B4 (de) 2014-02-06 2019-05-02 Hyundai Motor Company Verfahren des bestimmens des zirkulationszustands von kühlwasser
DE102016208211B4 (de) 2015-10-23 2019-05-09 Hyundai Motor Company System und verfahren zum diagnostizieren eines kühlwasserzustands
EP3569865A1 (fr) 2018-05-15 2019-11-20 Siemens Aktiengesellschaft Surveillance d'une pompe centrifuge entrainée par un moteur électrique
AT522267A1 (de) * 2019-03-12 2020-09-15 Neuburg Wilfried Trockenlaufschutzmodul
EP2795134B1 (fr) 2011-12-22 2020-12-09 Xylem IP Holdings LLC Contrôle de pompe avec procédure de nettoyage ou arrêt en fonction de la charge du moteur
WO2020244927A1 (fr) * 2019-06-05 2020-12-10 Robert Bosch Gmbh Procédé de fonctionnement d'au moins un dispositif de transport de fluide
US10947982B2 (en) 2014-02-06 2021-03-16 Hyundai Motor Company Method of determining circulation state of cooling water
EP3838082A1 (fr) * 2019-12-19 2021-06-23 Koninklijke Philips N.V. Système de distribution d'écoulement
LU102210B1 (de) * 2020-11-18 2022-05-18 Wilo Se Verfahren zur Bestimmung einer Betriebsinformation aus der Startenergie einer Kreiselpumpe und zugehörige Kreiselpumpe
RU2807180C1 (ru) * 2019-12-19 2023-11-10 Версуни Холдинг Б.В. Система и способ подачи потока, машина для приготовления напитка, а также носитель данных, на котором хранится компьютерная программа для реализации способа

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US3953777A (en) * 1973-02-12 1976-04-27 Delta-X Corporation Control circuit for shutting off the electrical power to a liquid well pump
EP0331659A1 (fr) * 1988-03-04 1989-09-06 ITT Flygt Aktiebolag Méthode de commande d'arrêts d'un moteur d'entraînement, actionné par intervalles
EP0775827A2 (fr) * 1995-11-24 1997-05-28 ITT Flygt Aktiebolag Méthode de pilotage pour vider une station de pompage des eaux usées
AU2005100918A4 (en) * 2004-11-01 2005-12-22 Perry, Andrew John Mr Stand alone in-line electrical monitoring device to provide protection for centrifugal pumps from dry running or low flow operating conditions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953777A (en) * 1973-02-12 1976-04-27 Delta-X Corporation Control circuit for shutting off the electrical power to a liquid well pump
EP0331659A1 (fr) * 1988-03-04 1989-09-06 ITT Flygt Aktiebolag Méthode de commande d'arrêts d'un moteur d'entraînement, actionné par intervalles
EP0775827A2 (fr) * 1995-11-24 1997-05-28 ITT Flygt Aktiebolag Méthode de pilotage pour vider une station de pompage des eaux usées
AU2005100918A4 (en) * 2004-11-01 2005-12-22 Perry, Andrew John Mr Stand alone in-line electrical monitoring device to provide protection for centrifugal pumps from dry running or low flow operating conditions

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2151580A1 (fr) * 2008-08-05 2010-02-10 Ksb S.A.S Contrôle de fonctionnement d'un groupe motopompe
FR2934877A1 (fr) * 2008-08-05 2010-02-12 Ksb Sas Controle de fonctionnement d'un groupe motopompe.
DE102010039531A1 (de) 2010-08-19 2012-02-23 Siemens Aktiengesellschaft Verfahren zur sicherheitsgerichteten Überwachung einer von einem Elektromotor angetriebenen Kreiselpumpe im ATEX-Bereich sowie Kreiselpumpensystem für den ATEX-Bereich
WO2012062650A3 (fr) * 2010-11-11 2013-05-10 Grundfos Holding A/S Ensemble pompe
US9490668B2 (en) 2010-11-11 2016-11-08 Grundfos Holding A/S Pump unit
CN103282670A (zh) * 2010-11-11 2013-09-04 格兰富控股联合股份公司 泵机组
US20130300330A1 (en) * 2010-11-11 2013-11-14 Grundfos Holding A/S Pump unit
EP2453555B1 (fr) 2010-11-11 2023-02-08 Grundfos Management a/s Groupe motopompe
US10236731B2 (en) 2010-11-11 2019-03-19 Grundfos Holding A/S Wet electric motor and pumping set
US9362784B2 (en) 2010-11-11 2016-06-07 Grundfos Holding A/S Pump unit
US9800098B2 (en) 2010-11-11 2017-10-24 Grundfos Holding A/S Pump unit
US9570945B2 (en) 2010-11-11 2017-02-14 Grundfos Holding A/S Electric motor
EP2453555A3 (fr) * 2010-11-11 2017-04-05 Grundfos Management a/s Groupe motopompe
EP2500579A1 (fr) 2011-03-17 2012-09-19 Siemens Aktiengesellschaft Détection de la cavitation et de l'entraînement de gaz dans une pompe électrique centrifuge
EP2795134B1 (fr) 2011-12-22 2020-12-09 Xylem IP Holdings LLC Contrôle de pompe avec procédure de nettoyage ou arrêt en fonction de la charge du moteur
US10947982B2 (en) 2014-02-06 2021-03-16 Hyundai Motor Company Method of determining circulation state of cooling water
DE102014218786B4 (de) 2014-02-06 2019-05-02 Hyundai Motor Company Verfahren des bestimmens des zirkulationszustands von kühlwasser
DE102014008716A1 (de) 2014-06-18 2015-12-24 Wilo Se Verfahren zur Erkennung eines Trockenlaufs
DE102014008716B4 (de) 2014-06-18 2022-01-13 Wilo Se Verfahren zur Erkennung eines Trockenlaufs
WO2015192955A1 (fr) * 2014-06-18 2015-12-23 Wilo Se Procédé permettant d'identifier une marche à sec d'une pompe centrifuge
DE102016208211B4 (de) 2015-10-23 2019-05-09 Hyundai Motor Company System und verfahren zum diagnostizieren eines kühlwasserzustands
DE102017004097A1 (de) * 2017-04-28 2018-10-31 Wilo Se Verfahren zur Detektion eines abnormalen Betriebszustands eines Pumpenaggregats
EP3569865A1 (fr) 2018-05-15 2019-11-20 Siemens Aktiengesellschaft Surveillance d'une pompe centrifuge entrainée par un moteur électrique
AT522267A1 (de) * 2019-03-12 2020-09-15 Neuburg Wilfried Trockenlaufschutzmodul
WO2020244927A1 (fr) * 2019-06-05 2020-12-10 Robert Bosch Gmbh Procédé de fonctionnement d'au moins un dispositif de transport de fluide
WO2021122782A1 (fr) * 2019-12-19 2021-06-24 Koninklijke Philips N.V. Système de distribution d'écoulement
CN114828705A (zh) * 2019-12-19 2022-07-29 皇家飞利浦有限公司 流递送系统
EP3838082A1 (fr) * 2019-12-19 2021-06-23 Koninklijke Philips N.V. Système de distribution d'écoulement
US11641975B2 (en) 2019-12-19 2023-05-09 Koninklijke Philips N.V. Flow system delivery system and beverage machine using same
RU2807180C1 (ru) * 2019-12-19 2023-11-10 Версуни Холдинг Б.В. Система и способ подачи потока, машина для приготовления напитка, а также носитель данных, на котором хранится компьютерная программа для реализации способа
LU102210B1 (de) * 2020-11-18 2022-05-18 Wilo Se Verfahren zur Bestimmung einer Betriebsinformation aus der Startenergie einer Kreiselpumpe und zugehörige Kreiselpumpe
EP4001656A1 (fr) * 2020-11-18 2022-05-25 Wilo Se Procédé de détermination des informations de fonctionnement à partir de l'énergie de démarrage d'une pompe centrifuge et pompe centrifuge associée

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