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EP0864755B1 - Double pump with sequential or synchronous operation - Google Patents

Double pump with sequential or synchronous operation Download PDF

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Publication number
EP0864755B1
EP0864755B1 EP98104145A EP98104145A EP0864755B1 EP 0864755 B1 EP0864755 B1 EP 0864755B1 EP 98104145 A EP98104145 A EP 98104145A EP 98104145 A EP98104145 A EP 98104145A EP 0864755 B1 EP0864755 B1 EP 0864755B1
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EP
European Patent Office
Prior art keywords
pump
supply flow
pumps
speed
procedure
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
EP98104145A
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German (de)
French (fr)
Other versions
EP0864755A3 (en
EP0864755A2 (en
EP0864755B2 (en
Inventor
Jürgen Resch
Jürgen Hübner
Hunnekuhl
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Wilo SE
Original Assignee
Wilo AG
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Publication date
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Application filed by Wilo AG filed Critical Wilo AG
Publication of EP0864755A2 publication Critical patent/EP0864755A2/en
Publication of EP0864755A3 publication Critical patent/EP0864755A3/en
Publication of EP0864755B1 publication Critical patent/EP0864755B1/en
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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
    • 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
    • F04D15/029—Stopping of pumps, or operating valves, on occurrence of unwanted conditions for pumps operating in parallel

Definitions

  • the invention relates to a method for operating a double pump with a first pump for generating smaller flow rates Q kl at a predetermined differential pressure between the pump suction and the pump outlet side and a second pump that can be connected to the first pump to generate larger flow rates Q gr and one of the two pumps controlling pump control.
  • Double pumps are well known from the prior art and are u.a. in Heating circuits are used to cover demand peaks of the pumped heating water to be able to. Modern double pumps are switched on by changing the speed constant or predetermined variable final pressure regulated.
  • Two control concepts are used for the double pumps. At the first Control concept, the two pumps of the double pump over the entire Control area to cover the required flow synchronously, i.e. with the same Speed, operated. In the second concept, on the other hand, only one of the two is used first Pumps used to cover the required flow. Once this pump yours maximum speed has been reached, the second pump is switched on and is still covered larger flow rates continuously regulated, with the first pump still with maximum speed is running.
  • the object of the invention is to improve the efficiency of a conventional double pump to improve without building the To change double pump.
  • Figure 1 shows a head-flow diagram with drawn pumps and consumer characteristics for the two Control concepts known from the prior art.
  • Figure 2 shows the for a certain constant head Power consumption of the two from the prior art known and explained control concepts for Double pump. It can be clearly seen that the required Performance to achieve a specific flow rate Q at small flow rates in synchronous operation (first Control concept) is larger than the load-dependent one Switch-on mode (second control concept), in which after The second pump reaches the maximum speed of the first pump Pump is switched on.
  • the performance curves of the two Control concepts intersect as they grow Flow rates at flow rate Q *. With flow rates Q larger Q * is the power consumption of the synchronous operation of the Double pump significantly lower than that of the start-up mode The maximum speed of the first pump is reached.
  • the Performance curves consequently coincide with very large ones Flow rates when both pumps are at maximum speed promote.
  • Flow rate Q * is achieved that the power consumption P of Double pump up and down the lowest curve below the flow rate Q * of the two control concepts equivalent.
  • the second pump is not switched on at the same flow rate as the switching off.
  • the flow rate Q must be selected to generate a hysteresis greater than the shutdown flow rate Q ab .
  • Figure 4 shows the power consumption of the first pump for a constant speed. It can be clearly seen that the Curve curve for flow rates Q greater than Q * flattened and at even larger flow rates is even falling. Anyn't external pressure sensor to determine the pressure difference between Pump suction and pump outlet side used, but would only the pump's internal speed parameters, power consumption and current consumption observed, so through the flat or falling up to the maximum flow Power consumption curve not determined with certainty when the maximum flow rate of the pump is reached.

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

Description

Die Erfindung betrifft ein Verfahren zum Betrieb einer Doppelpumpe mit einer ersten Pumpe zur Erzeugung von kleineren Förderströmen Qkl bei vorgebbarem Differenzdruck zwischen der Pumpenansaug- und der Pumpenauslaßseite und einer zur ersten Pumpe zuschaltbaren zweiten Pumpe zur Erzeugung von größeren Förderströmen Qgr und einer die beiden Pumpen steuernden Pumpensteuerung.The invention relates to a method for operating a double pump with a first pump for generating smaller flow rates Q kl at a predetermined differential pressure between the pump suction and the pump outlet side and a second pump that can be connected to the first pump to generate larger flow rates Q gr and one of the two pumps controlling pump control.

Doppelpumpen sind aus dem Stand der Technik hinlänglich bekannt und werden u.a. in Heizkreisläufen eingesetzt, um Bedarfsspitzen des geförderten Heizungswassers abdecken zu können. Moderne Doppelpumpen werden dabei durch Veränderung der Drehzahl auf konstanten oder vorgegebenen variablen Endruck geregelt.Double pumps are well known from the prior art and are u.a. in Heating circuits are used to cover demand peaks of the pumped heating water to be able to. Modern double pumps are switched on by changing the speed constant or predetermined variable final pressure regulated.

Dabei kommen zwei Steuerungskonzepte für die Doppelpumpen zum Einsatz. Beim ersten Steuerungskonzept werden die beiden Pumpen der Doppelpumpe über den gesamten Regelungsbereich zur Deckung des benötigten Förderstroms synchron, d.h. mit gleicher Drehzahl, betrieben. Beim zweiten Konzept wird dagegen zuerst lediglich eine der beiden Pumpen zur Deckung des geforderten Förderstroms verwendet. Sobald diese Pumpe ihre maximale Drehzahl erreicht hat, wird die zweite Pumpe zugeschaltet und zur Deckung noch größerer Förderströme kontinuierlich hochgeregelt, wobei die erste Pumpe weiterhin mit maximaler Drehzahl läuft.Two control concepts are used for the double pumps. At the first Control concept, the two pumps of the double pump over the entire Control area to cover the required flow synchronously, i.e. with the same Speed, operated. In the second concept, on the other hand, only one of the two is used first Pumps used to cover the required flow. Once this pump yours maximum speed has been reached, the second pump is switched on and is still covered larger flow rates continuously regulated, with the first pump still with maximum speed is running.

Pumpen gemäß dem zweiten Steuerungskonzept sind z.B. aus den Dokumenten US 3,775,025, GB 2 253 245 A und US 3,726,606 bekannt, wobei als Steuerungsgrößen Druck, Motorleistung bzw. benötigter Förderstrom herangezogen werden. Pumps according to the second control concept are e.g. from the documents US 3,775,025, GB 2 253 245 A and US 3,726,606 are known, being used as control variables Pressure, engine power or the required flow rate can be used.

Nachteilig wirkt sich bei diesen Steuerungskonzepten jedoch der erhöhte Energiebedarf aus. So ist der Wirkungsgrad der Pumpe bekanntlich stark abhängig vom Förderstrom.However, the disadvantage of these control concepts is increased energy requirements. This is the efficiency of the pump As is well known, it depends heavily on the flow rate.

Aufgabe der Erfindung ist es, den Wirkungsgrad einer herkömmlichen Doppelpumpe zu verbessern ohne den Aufbau der Doppelpumpe zu verändern.The object of the invention is to improve the efficiency of a conventional double pump to improve without building the To change double pump.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Pumpensteuerung die Drehzahl der ersten Pumpe ausgehend von kleineren Förderströmen bis zum Erreichen eines bestimmten größeren Förderstroms Q* kontinuierlich erhöht, wobei bis zum Erreichen des bestimmten Förderstroms Q* die zweite Pumpe ausgeschaltet ist, und daß die Pumpensteuerung bei Erreichen des Förderstroms Q* die zweite Pumpe zur ersten Pumpe zuschaltet, und für alle Förderströme Q >= Q* (Q größer gleich Q*) beide Pumpen mit annähernd der gleichen Drehzahl fördern.This object is achieved in that the Pump control the speed of the first pump based on smaller flow rates until a certain one is reached larger flow rate Q * continuously increased, with up to The second pump reaches the determined flow rate Q * is turned off, and that the pump control when reached of the flow rate Q * the second pump to the first pump switches on, and for all flow rates Q> = Q * (Q greater than or equal to Q *) Pump both pumps at approximately the same speed.

Eine derartige Steuerung hat den Vorteil, daß die beiden Pumpen der Doppelpumpe fast im gesamten Förderbereich näher an ihrem jeweiligen Wirkungsgradoptimum fördern, so daß sich hierdurch der Gesamtwirkungsgrad der erfindungsgemäßen Doppelpumpe erhöht.Such a control has the advantage that the two pumps the double pump is closer to yours in almost the entire delivery range Promote each efficiency optimum, so that this the overall efficiency of the double pump according to the invention elevated.

Ein derartiger Betrieb der Doppelpumpe hat weiterhin den Vorteil, daß ohne einen separaten Drucksensor, nur durch Erfassung und Auswertung der pumpeninternen Parameter Drehzahl, Strom und aufgenommene Leistung, eine gute Regelgenauigkeit erreicht werden kann. Diese Regelgenauigkeit ist deshalb gewährleistet, da das Zuschalten der zweiten Pumpe in einem Bereich fällt, in dem die Leistungsaufnahme bei zunehmendem Förderstrom der ersten Pumpe noch steil genug ansteigt, so daß eine Leistungsänderung genügend genau ermittelbar ist und somit bei erreichtem Förderstrom Q* die zweite Pumpe zugeschaltet werden kann. Dies ist bei bekannten Doppelpumpen, welche mittels des zweiten Steuerungskonzepts betrieben werden nicht gewährleistet, da im Bereich der maximalen Drehzahl die Leistungskurve flach bzw. fallend verläuft und durch die Beobachtung der Leistungsaufnahme der ersten Pumpe der Zuschaltpunkt der zweiten Pumpe nicht hinreichend genau ermittelbar ist.Such operation of the double pump continues to Advantage that without a separate pressure sensor, only by Acquisition and evaluation of the pump's internal speed parameters, Current and power consumed, good control accuracy can be achieved. This control accuracy is therefore guaranteed because the activation of the second pump in one Area in which the power consumption falls with increasing Flow of the first pump rises steep enough so that a change in performance can be determined with sufficient accuracy and thus when the flow rate Q * is reached, the second pump is switched on can be. This is the case with known double pumps, which are not operated by means of the second control concept guaranteed because in the range of the maximum speed Performance curve runs flat or falling and through the Observation of the power consumption of the first pump of the Switch-on point of the second pump is not sufficiently precise can be determined.

Es ist weiterhin vorteilhaft, wenn die zweite Pumpe bei sinkendem Bedarf nicht bei dem gleichen Förderstrom Q* abgeschaltet wird, bei dem sie vorher zugeschaltet wurde, damit ein instabiler Betriebszustand vermieden wird. Die so vorgegebene Hysterese verhindert ein dauerndes Zu- und Abschalten der zweiten Pumpe und einen damit einhergehenden schnellen Verschleiß der Doppelpumpe.It is also advantageous if the second pump falling demand not at the same flow rate Q * is switched off at which it was previously switched on, so an unstable operating state is avoided. The so The specified hysteresis prevents permanent closing and closing Switching off the second pump and an associated one rapid wear of the double pump.

Nachfolgend wird anhand von Diagrammen die Erfindung näher erläutert.The invention is explained in more detail below with the aid of diagrams explained.

Es zeigen:

Figur 1
Ein Förderhöhe-Förderstrom-Diagramm für eine Doppelpumpe;
Figur 2
ein Leistungsaufnahme-Diagramm für eine Doppelpumpe im Synchron- sowie im lastabhängigen Zuschaltbetrieb;
Figur 3
ein Förderhöhe-Förderstrom-Diagramm für die erfindungsgemäße Doppelpumpe;
Figur 4
ein Leistungsaufnahme-Förderstrom-Diagramm für eine Pumpe der Doppelpumpe.
Show it:
Figure 1
A head-flow diagram for a double pump;
Figure 2
a power consumption diagram for a double pump in synchronous and load-dependent start-up mode;
Figure 3
a head-flow diagram for the double pump according to the invention;
Figure 4
a power consumption-flow rate diagram for a pump of the double pump.

Figur 1 zeigt ein Förderhöhe-Förderstrom-Diagramm mit eingezeichneten Pumpen und Verbraucherkennlinien für die beiden aus dem Stand der Technik bekannten Steuerungskonzepte.Figure 1 shows a head-flow diagram with drawn pumps and consumer characteristics for the two Control concepts known from the prior art.

Figur 2 zeigt für eine bestimmte konstante Förderhöhe die Leistungsaufnahme der beiden aus dem Stand der Technik bekannten und oben erläuterten Steuerungskonzepten für Doppelpumpen. Es ist deutlich zu erkennen, daß die benötigte Leistung zur Erzielung eines bestimmten Förderstroms Q bei kleinen Förderströmen im Synchronbetrieb (erstes Steuerungskonzept) größer ist als beim lastabhängigen Zuschaltbetrieb (zweites Steuerungskonzept), bei dem nach Erreichen der maximalen Drehzahl der ersten Pumpe die zweite Pumpe hinzugeschaltet wird. Die Leistungskurven der beiden Steuerungskonzepte schneiden sich bei größer werdenden Förderströmen beim Förderstrom Q*. Bei Förderströmen Q größer Q* ist die Leistungsaufnahme des Synchronbetriebs der Doppelpumpe deutlich geringer als die des Zuschaltbetriebes bei Erreichen der maximalen Drehzahl der ersten Pumpe. Die Leistungskurven decken sich konsequenterweise bei sehr großen Förderströmen, wenn beide Pumpen mit maximaler Drehzahl fördern.Figure 2 shows the for a certain constant head Power consumption of the two from the prior art known and explained control concepts for Double pump. It can be clearly seen that the required Performance to achieve a specific flow rate Q at small flow rates in synchronous operation (first Control concept) is larger than the load-dependent one Switch-on mode (second control concept), in which after The second pump reaches the maximum speed of the first pump Pump is switched on. The performance curves of the two Control concepts intersect as they grow Flow rates at flow rate Q *. With flow rates Q larger Q * is the power consumption of the synchronous operation of the Double pump significantly lower than that of the start-up mode The maximum speed of the first pump is reached. The Performance curves consequently coincide with very large ones Flow rates when both pumps are at maximum speed promote.

Aus dem Leistungsdiagramm der Figur 2 ist ferner zu entnehmen, daß die Leistungsaufnahme beim Zuschalten der zweiten Pumpe (zweites Steuerungskonzept) sprunghaft steigt.From the performance diagram in FIG. 2, it can also be seen that that the power consumption when switching on the second pump (second control concept) increases by leaps and bounds.

Durch das erfindungsgemäße Zuschalten der zweiten Pumpe bei dem Förderstrom Q* wird erreicht, daß die Leistungsaufnahme P der Doppelpumpe jeweils dem niedrigsten Kurvenverlauf ober- und unterhalb des Förderstroms Q* der beiden Steuerungskonzepte entspricht.By switching on the second pump according to the invention Flow rate Q * is achieved that the power consumption P of Double pump up and down the lowest curve below the flow rate Q * of the two control concepts equivalent.

Zur Erzielung des stabilen Betriebszustands erfolgt, wie aus Figur 3 ersichtlich ist, das Zuschalten der zweiten Pumpe nicht beim gleichen Förderstrom wie das Abschalten. Dabei muß der Förderstrom Qzu zur Erzeugung einer Hysterese größer als der Abschaltförderstrom Qab gewählt werden.In order to achieve the stable operating state, as can be seen from FIG. 3, the second pump is not switched on at the same flow rate as the switching off. The flow rate Q must be selected to generate a hysteresis greater than the shutdown flow rate Q ab .

Figur 4 zeigt die Leistungsaufnahme der ersten Pumpe für eine konstante Drehzahl. Es ist deutlich zu erkennen, daß sich der Kurvenverlauf für Förderströme Q größer Q* abflacht und bei noch größeren Förderströmen sogar fallend ist. Würde kein externer Drucksensor zur Ermittlung der Druckdifferenz zwischen Pumpenansaug- und Pumpenauslaßseite verwendet, sondern würden ausschließlich die pumpeninternen Parameter Drehzahl, aufgenommene Leistung sowie Stromaufnahme beobachtet, so kann durch den bis zum maximalen Förderstrom flach bzw. abfallenden Kurvenverlauf der Leistungsaufnahme nicht sicher festgestellt werden, wann der maximale Förderstrom der Pumpe erreicht ist.Figure 4 shows the power consumption of the first pump for a constant speed. It can be clearly seen that the Curve curve for flow rates Q greater than Q * flattened and at even larger flow rates is even falling. Wouldn't external pressure sensor to determine the pressure difference between Pump suction and pump outlet side used, but would only the pump's internal speed parameters, power consumption and current consumption observed, so through the flat or falling up to the maximum flow Power consumption curve not determined with certainty when the maximum flow rate of the pump is reached.

Durch das erfindungsgemäße Zuschalten der Pumpe bei dem Förderstrom Q*, welcher deutlich kleiner ist als der Förderstrom Q bei maximaler Drehzahl der ersten Pumpe, wird erreicht, daß das Zuschalten der zweiten Pumpe in einen Bereich der Leistungsaufnahme-Kurve gem. Figur 4 fällt, bei dem der Kurvenverlauf noch genügend steil ansteigend ist, so daß mit der Beobachtung der pumpeninternen Parameter der Zuschaltpunkt hinreichend genau bestimmbar ist.By switching on the pump according to the invention Flow rate Q *, which is significantly smaller than that Flow rate Q at the maximum speed of the first pump achieved that switching on the second pump in one area the power consumption curve acc. Figure 4 falls, in which the Curve is still steep enough to rise with the observation of the internal parameters of the pump can be determined with sufficient accuracy.

Die Ermittlung des Differenzdrucks bzw. des momentan geförderten Förderstroms Q einer Pumpe mit Hilfe der pumpeninternen Parameter ist Stand der Technik und soll hier nicht weiter erläutert werden.The determination of the differential pressure or the momentary conveyed flow Q of a pump using the Pump internal parameters are state of the art and should be here not explained further.

Claims (6)

  1. Procedure for operating a double pump with a first pump to produce small supply flows Qkl at a specifiable differential pressure between the pump intake side and the pump output side and a second pump which can be synchronised with the first pump to produce larger supply flows Qgr, and a pump control controlling one of the two pumps,
    characterised in that
    the pump control continually increases the speed of the first pump until the specified supply flow Q* is obtained, in which the second pump is switched off until the specified supply flow Q* is reached, and
    when the supply flow Q* is reached, the pump control synchronises the second pump with the first pump and both pumps feed at the same speed for all supply flows Q >= Q* (Q is greater than or equal to Q*).
  2. Procedure in accordance with claim 1, characterised in that, starting from a supply flow of Q > Q* (Q is greater than Q*), the pump control switches off the second pump in the event of falling demand as soon as the supply flow Q produced by both pumps is approximately equal to Q*.
  3. Procedure in accordance with claim 1 or 2, characterised in that the second pump is synchronised at a supply flow of Q*zu and switched off at a supply flow of Q*ab, in which Q*zu > Q*ab.
  4. Procedure in accordance with one of the preceding claims, characterised in that on synchronisation, the pump control decreases the speed of the first pump to the speed of the second pump in such a manner that the supply flow Q*zu that is produced solely by the first pump prior to the synchronisation of the second pump, is produced in identical parts conjointly by both pumps after synchronisation.
  5. Procedure in accordance with one of the preceding claims, characterised in that, when the second pump is switched off, the pump control increases the speed of the first pump in such a manner that the supply flow produced by the first pump is identical to the supply flow produced conjointly by both pumps prior to the second pump being switched off.
  6. Procedure in accordance with one of the preceding claims, characterised in that the supply flow Q produced by the twin pump can be determined by means of the pumps' internal parameters of speed, electricity input and output consumed.
EP98104145A 1997-03-14 1998-03-09 Double pump with sequential or synchronous operation Expired - Lifetime EP0864755B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19710675 1997-03-14
DE19710675A DE19710675B8 (en) 1997-03-14 1997-03-14 Double pump with single and synchronous operation

Publications (4)

Publication Number Publication Date
EP0864755A2 EP0864755A2 (en) 1998-09-16
EP0864755A3 EP0864755A3 (en) 2000-11-29
EP0864755B1 true EP0864755B1 (en) 2003-08-13
EP0864755B2 EP0864755B2 (en) 2011-03-16

Family

ID=7823427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98104145A Expired - Lifetime EP0864755B2 (en) 1997-03-14 1998-03-09 Double pump with sequential or synchronous operation

Country Status (2)

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EP (1) EP0864755B2 (en)
DE (2) DE19710675B8 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2469094A2 (en) 2010-12-23 2012-06-27 Wilo Se Method for operating a double pump or multi pump assembly
USD834068S1 (en) 2017-01-27 2018-11-20 S.A. Armstrong Limited Control pump
RU2740387C1 (en) * 2017-12-19 2021-01-13 Ксб Се & Ко. Кгаа Multi-pump plant and method of its operation
US11732719B2 (en) 2017-01-27 2023-08-22 S.A. Armstrong Limited Dual body variable duty performance optimizing pump unit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19958829C1 (en) 1999-11-30 2001-08-02 Mannesmann Ag Fuel cell system with a device for supplying fuel
WO2007095537A1 (en) * 2006-02-13 2007-08-23 Ingersoll-Rand Company Multi-stage compression system and method of operating the same
DE102014222962A1 (en) 2014-11-11 2016-05-12 Ksb Aktiengesellschaft Efficient operation of multi-pump systems
US10844862B2 (en) 2017-06-30 2020-11-24 Taco, Inc. Self-sensing parallel control of pumps

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726606A (en) * 1971-11-19 1973-04-10 A Peters Sump apparatus
US3970413A (en) * 1972-01-24 1976-07-20 Francois Duveau Fluid distribution apparatus and method
US3775025A (en) * 1972-02-02 1973-11-27 Maher Corp Constant pressure pumping unit
DE3225141C2 (en) † 1982-07-06 1984-12-20 Grundfos A/S, Bjerringbro Speed-controlled pump unit
DE3238020A1 (en) * 1982-10-13 1984-04-19 Linde Ag, 6200 Wiesbaden Device for conveying a liquid
DE3918246A1 (en) * 1989-06-05 1990-12-06 Eggs Elektrotechnik Water pressure intensifier system - incorporates single pump with adjustable capacity
GB2253245B (en) * 1991-02-28 1994-10-19 Hamworthy Heating Ltd Flow related control means for a pump
DE4128390C1 (en) * 1991-08-27 1992-12-24 Loewe Pumpenfabrik Gmbh, 2120 Lueneburg, De Rapid control appts. for fluid supply installation - has controller connected via digital communication line to pump motor regulators which provide setting signals for frequency converters

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2469094A2 (en) 2010-12-23 2012-06-27 Wilo Se Method for operating a double pump or multi pump assembly
DE102010055841A1 (en) 2010-12-23 2012-06-28 Wilo Se Method for operating a double pump or multi-pump unit
EP2469094A3 (en) * 2010-12-23 2015-05-06 Wilo Se Method for operating a double pump or multi pump assembly
USD834068S1 (en) 2017-01-27 2018-11-20 S.A. Armstrong Limited Control pump
USD839313S1 (en) 2017-01-27 2019-01-29 S.A. Armstrong Limited Control pump
USD839314S1 (en) 2017-01-27 2019-01-29 S.A. Armstrong Limited Control pump
USD839922S1 (en) 2017-01-27 2019-02-05 S.A. Armstrong Limited Control pump
US11732719B2 (en) 2017-01-27 2023-08-22 S.A. Armstrong Limited Dual body variable duty performance optimizing pump unit
US11965512B2 (en) 2017-01-27 2024-04-23 S.A. Armstrong Limited Dual body variable duty performance optimizing pump unit
US12372091B2 (en) 2017-01-27 2025-07-29 S.A. Armstrong Limited Twin pump unit casing having motor mounted touchscreens
RU2740387C1 (en) * 2017-12-19 2021-01-13 Ксб Се & Ко. Кгаа Multi-pump plant and method of its operation

Also Published As

Publication number Publication date
EP0864755A3 (en) 2000-11-29
EP0864755A2 (en) 1998-09-16
DE59809242D1 (en) 2003-10-02
DE19710675B8 (en) 2012-03-29
DE19710675B4 (en) 2012-01-12
EP0864755B2 (en) 2011-03-16
DE19710675A1 (en) 1998-09-17

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