EP1138950A1 - Pumpensteuergerät - Google Patents
Pumpensteuergerät Download PDFInfo
- Publication number
- EP1138950A1 EP1138950A1 EP00890098A EP00890098A EP1138950A1 EP 1138950 A1 EP1138950 A1 EP 1138950A1 EP 00890098 A EP00890098 A EP 00890098A EP 00890098 A EP00890098 A EP 00890098A EP 1138950 A1 EP1138950 A1 EP 1138950A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- controller
- pump
- pressure
- motor
- control circuit
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 230000010354 integration Effects 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005086 pumping Methods 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 outlet pressure of the 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 controller for Control of the electric motor is supplied.
- a controller for comparing an actual value of an outlet pressure of the 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 controller for Control of the electric motor is supplied.
- Pump drive speed usually used to fluctuate consumption values at constant pressure or sliding pressures according to specified criteria to cover.
- the pumping station delivery rate can be arbitrary fluctuating delivery pressures are kept constant or, e.g. with filter systems with variable filter resistance, according to certain criteria.
- the required speed of the pumps is usually determined using P- (proportional-), PI- (proportional-integral) or PID (proportional-integral-differential) controllers Comparison of a measured actual value of the pump outlet pressure or the Consumer pressure in the system with a predetermined setpoint of this pressure determined and a corresponding output signal from the controller to the speed controller of the motor of the liquid pump.
- FIGS. 3 and 4 A known system of the type described is shown in FIGS. 3 and 4 for example explained.
- 3 schematically shows two variants of such Appendix
- Fig. 4 shows a pressure-time diagram for this.
- the pump 1 in this case a centrifugal pump, by the electric motor 2, here Three-phase short-circuit armature motor or a DC motor, driven.
- On the Motor 2 acts as a speed control device 3, e.g. a frequency converter at Three-phase short-circuit armature motors or a thyristor converter DC motors or a voltage regulator.
- This speed control device 3 receives the above-mentioned signal of a PI controller 4, which this signal due to Comparison of the values of the pressure actual value transmitter 5 and the pressure setpoint transmitter 6 determined.
- a storage tank 8 can be connected to the consumer network N.
- the 2 illustrates the operation of this known system in the Operation, with time t along the abscissa and pressure D along the ordinate are applied.
- St is the start time
- H shows the start-up time
- DB indicates continuous operation
- the line DS shows the pressure setpoint.
- the Dashed line FD gives the course of the delivery pressure or outlet pressure Pump in the operation of this system, with this delivery pressure the pressure in Supply network N is the same and represents a function of the speed of the motor.
- the invention has for its object the uneconomical operation of the pumps to suppress at zero delivery rates and thus unnecessary 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 controller in the Operating mode according to the invention by recurring forced change brought from this constant state cyclically by control parameters, and the controller must therefore always react anew to the changed values and parameters.
- the present invention is characterized in that a P, PI, or PID controller is used in the mode of operation according to the invention, the can provide continuously changing ramps of the delivery pressure.
- control unit can expedient chronological sequence of change times of the control parameters specified or changed during operation.
- a preferred embodiment of the system according to the invention is thereby characterized in that the control circuit, advantageously via a setpoint generator, 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 element, which by the Control circuit is varied.
- the transfer function of the controller has an integration element which is varied by the control circuit.
- the Transfer function of the controller on a differentiator by Control circuit is varied.
- the transmission behavior of the differentiator described by v (t) Kd du (t) / dt, (v (t) .. output signal, u (t) .. input signal, Kd .. Differentiating coefficient), the differentiating coefficient Kd is changed.
- the motor of the liquid pump is a three-phase motor, then as Speed control device expediently used a frequency converter.
- the speed control device Conveniently designed as a converter or voltage regulator.
- 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 system according to the invention from FIG. 1 corresponds in many parts to that 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 at Three-phase short-circuit armature motors or a thyristor converter DC motors or a voltage regulator, driven.
- This Speed control device 3 receives a control output signal 4a from a controller 4 which is a has predetermined transmission behavior, the proportional, integral and / or May have differential components.
- controller 4 is a PID controller executed.
- the controller 4 obtains its input signals from one hand Actual pressure sensor 5, which is a pressure value transformed into an electrical variable the pump outlet or the consumer pressure of the network N to which the pump is connected, and, on the other hand, by a pressure setpoint transmitter 6, the one Specifies the setpoint of the consumer pressure, which reaches as quickly and accurately as possible shall be.
- the controller 4 calculates the output signal 4a mentioned in a manner known per se acts on the speed control device 3.
- consumers are also connected to the network connected.
- a storage tank 8 can be attached to the Consumer network N must be connected.
- control circuit 10 which acts on the pressure setpoint sensor 6 and / or acts directly on the controller 4 and cyclically - regardless of whether in regular or irregular time intervals - control parameters of controller 4 and / or Pressure setpoint adjusted.
- the control parameters can have coefficients of Proportional, integral and / or differential elements of the transfer function of the Controller.
- the consumption should end later, and the The time of this end of consumption is indicated by E.
- the dashed line GL does the respective delivery pressure of the pump 1 as a function of the speed
- the dot-dash line Line PL the pressure in the supply network N is visible.
- GL and PL climb along a ramp up steeply and essentially simultaneously until the upper limit a of the pressure setpoint in the consumer network has almost been reached.
- the ramp up goes from GL and PL continuously into an asymptote to the horizontal line a, whereby the Consumption is adjusted accordingly.
- the lagging of the delivery pressure of the Pump compared to the consumer pressure is negligibly small and therefore in the Drawing not shown.
- the control circuit 10 switches Pressure setpoint for the first time to the lower limit value e, and controller 4 compensates for this due to reduced pump delivery.
- the curves GL and PL decrease accordingly.
- the Pressure setpoint through the control circuit 10 this time again to the upper one Limit a. Delivery pressure GL and consumer pressure PL increase accordingly. It is Note that liquid has been removed from the system so far, i.e. on Consumption has occurred. However, this consumption ends at time E, which is why the delivery rate of the pump is reduced. Since it is also assumed that it is an essentially closed network system, which Condition can still be regarded as fulfilled even with losses of 1 to 2%, the consumer pressure therefore remains at a constant value that is almost as great like the upper limit a.
- the control circuit 4 tries to switch the pressure setpoint back to the lower limit value e by correspondingly reducing the speed of the motor 2 and thus the Pump delivery pressure GL the consumer pressure PL to the new, reduced setpoint adapt. But since, as I said, it is a closed system, the Consumer pressure cannot be reduced. The result is that the pump 1 to complete standstill comes and therefore does not continue in uneconomical operation, only to keep the pressure. Only when there is a new consumption of the System pressure (pressure in the network N) decrease again and would pump 1 when reached of the lower pressure limit value e are started again. Another one Switching the pressure setpoint to the upper limit a could cause the pump to Get started.
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)
- Control Of Multiple Motors (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
- Valve Device For Special Equipments (AREA)
- Power Steering Mechanism (AREA)
Abstract
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 zumindest einen der Regelparameter des Reglers (4) variiert.
- Anlage nach Anspruch 1, dadurch gekennzeichnet, daß die Steuerschaltung (10), vorzugsweise über einen Sollwertgeber (6), den dem Regler (4) zugeführten Sollwert variiert.
- Anlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Übertragungsfunktion des Reglers (4) ein Proportionalglied 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 Integrationsglied aufweist, das durch die Steuerschaltung (10) variiert wird.
- Anlage nach einem der Ansprüche 1 bis 4, 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 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 |
EP00890098A EP1138950B1 (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 |
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 true EP1138950A1 (de) | 2001-10-04 |
EP1138950B1 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) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1731684A1 (de) * | 2005-06-11 | 2006-12-13 | KSB Aktiengesellschaft | Betriebsverfahren für eine Abwasserhebeanlage und mit diesem Verfahren betriebenen Anlage |
US7197878B2 (en) | 2003-05-09 | 2007-04-03 | Rolls-Royce Plc | Pump control system |
Citations (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 |
EP0619432A1 (de) | 1993-04-08 | 1994-10-12 | Pumpenfabrik Ernst Vogel Gesellschaft m.b.H. | Anlage mit mindestens einer Flüssigkeitspumpe |
EP0709575A1 (de) * | 1994-10-05 | 1996-05-01 | FRANKLIN ELECTRIC Co., Inc. | Flüssigkeitsstromapparat |
-
2000
- 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
- 2000-03-27 DE DE50004980T patent/DE50004980D1/de not_active Expired - Lifetime
Patent Citations (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 |
EP0619432A1 (de) | 1993-04-08 | 1994-10-12 | Pumpenfabrik Ernst Vogel Gesellschaft m.b.H. | Anlage mit mindestens einer Flüssigkeitspumpe |
EP0709575A1 (de) * | 1994-10-05 | 1996-05-01 | FRANKLIN ELECTRIC Co., Inc. | Flüssigkeitsstromapparat |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7197878B2 (en) | 2003-05-09 | 2007-04-03 | Rolls-Royce Plc | Pump control system |
EP1731684A1 (de) * | 2005-06-11 | 2006-12-13 | KSB Aktiengesellschaft | Betriebsverfahren für eine Abwasserhebeanlage und mit diesem Verfahren betriebenen Anlage |
Also Published As
Publication number | Publication date |
---|---|
EP1138950B1 (de) | 2004-01-07 |
ATE257548T1 (de) | 2004-01-15 |
DK1138950T3 (da) | 2004-05-03 |
DE50004980D1 (de) | 2004-02-12 |
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