EP1138950B1 - Pumpensteuergerät - Google Patents
Pumpensteuergerät Download PDFInfo
- Publication number
- EP1138950B1 EP1138950B1 EP00890098A EP00890098A EP1138950B1 EP 1138950 B1 EP1138950 B1 EP 1138950B1 EP 00890098 A EP00890098 A EP 00890098A EP 00890098 A EP00890098 A EP 00890098A EP 1138950 B1 EP1138950 B1 EP 1138950B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- controller
- pump
- pressure
- control circuit
- transfer function
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, 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
- F04B49/20—Control, 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 by changing the driving speed
-
- 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
Definitions
- the invention relates to a system with at least one liquid pump, preferably centrifugal pump, which is driven by an electric motor and with a controller for comparing an actual value of an output pressure of Liquid pump with a predetermined setpoint of the outlet pressure and a Output signal, which depends on the result of the comparison and a Transfer function of the controller varies and a speed control device for Control of the electric motor is supplied.
- a liquid pump preferably centrifugal pump
- a controller for comparing an actual value of an output pressure of Liquid pump with a predetermined setpoint of the outlet pressure and a Output signal, which depends on the result of the comparison and a Transfer function of the controller varies and a speed control device for Control of the electric motor is supplied.
- the required speed of the pumps is usually determined by means of P (proportional), PI (proportional-integral) or PID (proportional-integral-derivative) controllers Comparison of a measured actual value of the pump output pressure or the Consumer pressure in the system with a predetermined setpoint of this pressure determined and a corresponding output signal of the controller the speed controller supplied to the motor of the liquid pump.
- Fig. 4 is a pressure-time diagram for this purpose.
- the pump 1 in In this case, a centrifugal pump, by the electric motor 2, here a Three-phase short-circuited motor or a DC motor, powered.
- a speed control device 3 e.g. a frequency converter Three-phase short-circuiting motors or a Thyristorstromrichter at DC motors or a voltage regulator.
- This speed controller 3 receives the aforementioned signal of a PI controller 4, which receives this signal on the basis of Comparison of the values of the pressure / actual value encoder 5 and the pressure setpoint encoder 6 determined.
- the consumers are connected.
- the Diagram of FIG. 2 illustrates the operation of this known plant in Operation, wherein along the abscissa the time t and along the ordinate the pressure D are applied.
- St is the start time
- H indicates the start time
- DB refers to continuous operation
- the DS line indicates the pressure setpoint.
- the Dashed line FD indicates the course of the delivery pressure or output pressure of the Pump in the operation of this system, wherein this delivery pressure to the pressure in Supply network N is equal and represents a function of the speed of the motor.
- the invention is based on the object, the uneconomical operation of the pump to suppress at zero flow rates and thus unnecessary To avoid energy consumption and extend the life of the pump.
- This object is achieved in that a control circuit is provided, which cyclically varies at least one of the control parameters of the controller.
- the present invention is characterized in that a P, PI, or PID controller is used in the operation of the invention, the can provide continuously variable ramps of delivery pressure.
- a preferred embodiment of the system according to the invention is characterized characterized in that the control circuit, suitably via a setpoint generator, the The setpoint supplied to the controller varies.
- Another embodiment of the invention is characterized in that the Transfer function of the controller has a proportional member, by the Control circuit is varied.
- the transfer function of the regulator comprises an integrator which is varied by the control circuit.
- the plant has the Transfer function of the controller to a differentiator, by the Control circuit is varied.
- Speed controller expediently used a frequency converter.
- the motor of the liquid pump is a DC motor
- each Pump a separate speed control device and a separate controller provided.
- FIG. 1 shows two variants of a system according to the invention and FIG. 2 shows an associated one Pressure-time diagram.
- the inventive system of Fig. 1 corresponds in many parts of those known in 3 and comprises a liquid pump 1, e.g. a Centrifugal pump, which is driven by an electric motor 2.
- the engine 2 is from a speed control device 3, e.g. a frequency converter Three-phase short-circuiting motors or a Thyristorstromrichter at DC motors or a voltage regulator, driven.
- This Speed control device 3 receives a control output signal 4a from a controller 4, the one has predetermined transmission behavior, the proportional, integral and / or May have differential components.
- controller 4 is a PID controller executed.
- the controller 4 receives its input signals on the one hand from a Pressure-actual value transmitter 5, which is a transformed into an electrical value pressure value the pump output or the consumer pressure of the network N to which the pump is connected, and on the other hand from a pressure setpoint encoder 6, the one Specifies setpoint of the consumer pressure that reaches as quickly and accurately shall be.
- the controller 4 calculates in known manner the said output signal 4a, the acts on the speed control unit 3.
- consumers are also connected to the grid connected. As indicated by dashed lines, can still be a storage vessel 8 to the Be connected to consumer network N.
- control circuit 10 which is on the pressure setpoint encoder. 6 and / or acts directly on the controller 4 and cyclically - regardless of whether in regular or irregular time intervals - control parameters of the controller 4 and / or the Pressure setpoint adjusted.
- the control parameters can be coefficients of Proportional, integral and / or differential terms of the transfer function of Regulator.
- the dashed line GL makes the respective delivery pressure of the pump 1 as a function of speed
- the dot-dash line Line PL the pressure in the supply network N visible.
- GL and PL climb along ramp up and substantially simultaneously until the upper limit a of the pressure setpoint in the consumer network is almost reached. Now go the ramp-up of GL and PL steadily in an asymptote to the horizontal line a on, where the Consumption is readjusted accordingly.
- the lag of the delivery pressure of Pump compared to the consumer pressure is negligible and therefore in the Drawing not shown.
- the control circuit 10 switches Pressure setpoint for the first time to the lower limit e, and the controller 4 is similar due to reduced pumping capacity accordingly.
- the curves GL and PL decrease accordingly.
- a further change of the Pressure setpoint by the control circuit 10 this time again to the upper Limit a.
- Delivery pressure GL and consumer pressure PL increase accordingly. It is Note that until now fluid has been withdrawn from the system, i. one Consumption has taken place. However, this consumption ends at time E, which is why the delivery rate of the pump is regulated back.
Landscapes
- 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)
- Valve Device For Special Equipments (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
- Power Steering Mechanism (AREA)
- Control Of Multiple Motors (AREA)
Description
Claims (8)
- Anlage mit mindestens einer Flüssigkeitspumpe (1), vorzugsweise Kreiselpumpe, die von einem elektrischen Motor (2) angetrieben wird und mit einem Regler (4) zum Vergleich eines Istwerts eines Ausgangsdrucks der Flüssigkeitspumpe mit einem vorgegebenen Sollwert des Ausgangsdrucks und einem Ausgangssignal (4a), das in Abhängigkeit des Ergebnisses des Vergleichs und einer Übertragungsfunktion des Reglers variiert und einem Drehzahlregelgerät (3) zur Ansteuerung des elektrischen Motors (2) zugeführt wird, dadurch gekennzeichnet, daß eine Steuerschaltung (10) vorgesehen ist, die zyklisch die Übertragungsfunktion des Reglers (4) variiert.
- Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Übertragungsfunktion des Reglers (4) ein Proportionalglied aufweist, das durch die Steuerschaltung (10) variiert wird.
- Anlage nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Übertragungsfunktion des Reglers (4) ein Integrationsglied aufweist, das durch die Steuerschaltung (10) variiert wird.
- Anlage nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Übertragungsfunktion des Reglers (4) ein Differenzierglied aufweist, das durch die Steuerschaltung (10) variiert wird.
- Anlage nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Steuerschaltung (10), vorzugsweise über einen Sollwertgeber (6), den dem Regler (4) zugeführten Sollwert variiert.
- Anlage nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Motor (2) ein Drehstrommotor und das Drehzahlregelgerät (3) ein Frequenzumformer ist.
- Anlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Motor (2) ein Gleichstrommotor und das Drehzahlregelgerät (3) ein Stromrichter oder Spannungsregelgerät ist.
- Anlage nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß bei Vorhandensein von mehr als einer Flüssigkeitspumpe (1) für jede Pumpe ein getrenntes Drehzahlregelgerät (3) und ein getrennter Regler (4) vorgesehen sind.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT00890098T ATE257548T1 (de) | 2000-03-27 | 2000-03-27 | Pumpensteuergerät |
DK00890098T DK1138950T3 (da) | 2000-03-27 | 2000-03-27 | Pumpestyreapparat |
DE50004980T DE50004980D1 (de) | 2000-03-27 | 2000-03-27 | Pumpensteuergerät |
EP00890098A EP1138950B1 (de) | 2000-03-27 | 2000-03-27 | Pumpensteuergerät |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00890098A EP1138950B1 (de) | 2000-03-27 | 2000-03-27 | Pumpensteuergerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1138950A1 EP1138950A1 (de) | 2001-10-04 |
EP1138950B1 true EP1138950B1 (de) | 2004-01-07 |
Family
ID=8175919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00890098A Expired - Lifetime EP1138950B1 (de) | 2000-03-27 | 2000-03-27 | Pumpensteuergerät |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1138950B1 (de) |
AT (1) | ATE257548T1 (de) |
DE (1) | DE50004980D1 (de) |
DK (1) | DK1138950T3 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0310643D0 (en) | 2003-05-09 | 2003-06-11 | Rolls Royce Plc | Pump control system |
DE102005027091A1 (de) * | 2005-06-11 | 2006-12-14 | Ksb Ag | Betriebsverfahren für eine Abwasserhebeanlage und mit diesem Verfahren betriebene Anlage |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4430698A (en) * | 1981-08-20 | 1984-02-07 | Harrel, Incorporated | Three-mode process control |
DE3824293A1 (de) * | 1988-07-18 | 1990-01-25 | Loewe Pumpenfabrik Gmbh | Verfahren zur sollwertverstellung in geregelten pumpensystemen |
DK0619432T3 (da) | 1993-04-08 | 1997-03-17 | Vogel Pumpen | Anlæg med mindst en væskepumpe |
US5580221A (en) * | 1994-10-05 | 1996-12-03 | Franklin Electric Co., Inc. | Motor drive circuit for pressure control of a pumping system |
-
2000
- 2000-03-27 DE DE50004980T patent/DE50004980D1/de not_active Expired - Lifetime
- 2000-03-27 AT AT00890098T patent/ATE257548T1/de active
- 2000-03-27 DK DK00890098T patent/DK1138950T3/da active
- 2000-03-27 EP EP00890098A patent/EP1138950B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE257548T1 (de) | 2004-01-15 |
DK1138950T3 (da) | 2004-05-03 |
EP1138950A1 (de) | 2001-10-04 |
DE50004980D1 (de) | 2004-02-12 |
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