EP1172560B1 - Pompe de dosage avec commande du courrant du moteur - Google Patents

Pompe de dosage avec commande du courrant du moteur Download PDF

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Publication number
EP1172560B1
EP1172560B1 EP20010116892 EP01116892A EP1172560B1 EP 1172560 B1 EP1172560 B1 EP 1172560B1 EP 20010116892 EP20010116892 EP 20010116892 EP 01116892 A EP01116892 A EP 01116892A EP 1172560 B1 EP1172560 B1 EP 1172560B1
Authority
EP
European Patent Office
Prior art keywords
motor
stroke
current
dosing pump
pump according
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
EP20010116892
Other languages
German (de)
English (en)
Other versions
EP1172560A2 (fr
EP1172560A3 (fr
Inventor
Kurt Solgaard
Knud Erik Pedersen
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.)
Grundfos AS
Original Assignee
Grundfos AS
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 Grundfos AS filed Critical Grundfos AS
Publication of EP1172560A2 publication Critical patent/EP1172560A2/fr
Publication of EP1172560A3 publication Critical patent/EP1172560A3/fr
Application granted granted Critical
Publication of EP1172560B1 publication Critical patent/EP1172560B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0201—Current
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/04—Motor parameters of linear electric motors
    • F04B2203/0401—Current

Definitions

  • the invention relates to a metering pump according to the preamble of Claim 1 specified characteristics.
  • metering pumps of the type mentioned drives an electric motor via a downstream gear an oscillating displacer pump on.
  • Transmission in the context of the invention is any implementation of rotatory rotor movement in the translational motion of Displacement pump.
  • the invention has the object, a generic Dosing pump form so that it works with higher efficiency, in particular generates lower heat loss on the motor side.
  • the basic idea of the present invention is, by means of the electronic Control the current supplied to the motor according to the expected engine load depending on the stroke position of Limit working machine.
  • the present invention can basically be applied to all engine controls for dosing pumps find application in which the rotational movement the motor shaft converted into a translational movement is and the engine load on the stroke of the pump systemic is subject to greater fluctuations.
  • a preferred and typical Application is with a metering pump, which by means of a servo or Stepper motor is driven and the pump through a membrane or piston pump is formed.
  • dosing pumps takes place in Transmission often still has a reduction ratio, so that according to the Stroke position of the pump provided current limit particularly effective is because the engine over possibly several turns with a low current can be controlled, as for example is appropriate for the return.
  • the pumping is produced under pressure in the working stroke, whereas the return stroke is used for suction. Since the Pressure stroke demands more power from the engine than the suction stroke, It is advisable to use the engine during the intake stroke with a smaller one To control electricity as during the print stroke.
  • the position transmitter expediently arranged so that it has a signal in the central region of the working stroke. This is especially true when using a Diaphragm pump appropriate, since then reliably ensured can be that the pump immediately after receiving this signal is shut down when it is switched off, since then namely the Diaphragm of the pump is not biased, reducing the life is increased.
  • the engine load is on the one hand dependent on the stroke position, since For example, in an eccentric drive the moment load of Motors with changing rotational position changes, even if the applied force to the push rod remains the same, on the other hand but also from the lifting speed. This is in the end positions the pump zero and about half of the stroke on the drive biggest.
  • the current limit of the motor with too be aware of why the current limit is also in Dependence of the expected lifting speed should take place.
  • Such a fixed current limit curve will then expediently still depending on the speed with which the pump delivers varies as the motor current at constant Engine torque load with increasing speed increases. This increase or decrease is in the determination of the Current limit curve expediently taken into account.
  • the current limitation will be done conveniently so that it depends on the pressure to be applied by the pump done so that when the pump is applying a high pressure has enough power and in phases Lower pressure of the current is lowered accordingly.
  • a corresponding sensor which is expediently arranged in the region of the pump becomes.
  • a force measuring device in the region of provided oscillating drive means, for example in the field of Push rod.
  • the current or the current limit curve on the previously made current limit ie the previously raised stage raised again to be sure that the engine in all stroke positions of the pump provides the required performance.
  • the gradual reduction or increase is preferably carried out at intervals, which a working stroke including return stroke of the pump correspond.
  • the engine in the following interval with the full Current (ie without the current limiting invention) to control and only in the next subsequent interval on the previously determined Stage at which such a speed reduction of the engine straight not yet done, lower.
  • the speed of the engine which is relatively expensive, such a also done by means of the already existing position encoder. If namely the motor the position in which the position sensor emits a signal, has not reached in a predetermined time, then this is so long energized with the full current until the position is reached then lowered to the previously determined level again.
  • the current limiting curve in its shape and position so dimensioned that not only increases the efficiency of the device but also cavitations during the suction stroke effectively prevented.
  • a current-controlled stepper motor drives a reduction gear on the output side an eccentric or cam drive having, which the rotational movement in a translational movement converts and drives a push rod oscillating, which is a diaphragm pump applied.
  • the load of the engine depends on the Push rod position and the direction of movement.
  • Fig. 1 shows 1, which is the burden of Motors depending on the push rod position during a work cycle shows, the load increases from zero starting at 90 °, so on the half of the return or suction stroke reaches its maximum and falls then at 180 ° again to zero.
  • the zero, 180 ° and 360 ° positions mark the end positions of the working machine, ie 180 ° the end of the Return stroke or start of the working stroke and 360 ° the end of the working stroke and the beginning of the return stroke (0 °).
  • the engine load shown with reference to FIG. 1, that is, in the respective Position of the working machine at a given speed of Engine applied torque, corresponds in the waveform substantially the power required by the engine.
  • FIG. 2 The relationship between motor current and motor torque is shown in FIG. 2 illustrated by two curves, the curve 4 a high motor current and the curve 5 a lower, respectively constant motor current represent. About the ordinate is the engine torque M and the abscissa the engine speed n is plotted. As from the curves 4 and 5 becomes clear, the engine torque is strong at low speeds depending on the current, whereas at higher speeds towards this Difference increasingly fades, until finally the moment approaches zero drops.
  • the torque curve shown with reference to FIG. 2 is typical of a such stepper motor as used to drive a metering pump becomes.
  • Fig. 3 are corresponding to the above-described position of the working machine shown in FIG. 1, two current limiting curves 6 and 7.
  • the current limiting curve 6 is included in the operation of the metering pump low pressure and the current limiting curve 7 for the operation of the Pump designed at high pressure, each with the same engine speed in the working stroke or in the return stroke.
  • these are in the range of the return stroke or suction stroke (0 ° to 180 °) coincidentally, whereas in the pressure stroke or working stroke (180 ° to 360 °) the curve 7 is clearly above the curve 6.
  • the work machine can apply the increased pressure, is higher from the engine Moment, which is generated by a larger motor current. Accordingly, the current limiting curve in this area is higher than at lower pressure.
  • this difference is practically not given, since the engine load in essence is equal to.
  • the current limiting curves 6 and 7 shown in FIG. 3 are intended for engine controls, in the return stroke of the working machine have a higher speed than in the working stroke. In such a Arrangement can use the current limit at the same time be used to avoid cavitation in the return or suction stroke. If such a speed change is not provided, then also the current limiting curves substantially the shape of in Fig. 1st have on the basis of curve 2 shown load curve.
  • Fig. 4 three current limiting curves 8, 9 and 10 are shown, which are at constant pressure load during the working stroke, but at different flow rate, d. H. different speed of the Motors revealed.
  • the current limit curves 8 to 10 are different only in the area of the working stroke (180 ° C to 360 °), and there essentially in the middle range and also only in moderation. 4 clarifies that with increasing engine speed, so with increasing Flow rate, the current required to operate the motor increases. This is also apparent from the physical contexts, because because of the higher speed and the power of the engine and thus the delivery rate of the pump increases.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (13)

  1. Pompe de dosage comprenant un moteur à commande par courant muni d'un rotor, une transmission montée en aval de ce dernier pour convertir le mouvement de rotation du rotor en une course de déplacement en translation, une pompe volumétrique oscillante, entraínée par cette transmission, et une commande électronique, caractérisée en ce que le courant envoyé au moteur est, en correspondance avec la charge attendue du moteur, limité en fonction du positionnement de la course de la pompe volumétrique.
  2. Pompe de dosage selon la revendication 1, caractérisée en ce que le moteur est un servomoteur ou un moteur pas à pas.
  3. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que, pendant la course d'aspiration, il est envoyé au moteur un courant plus faible que pendant la course de refoulement de la pompe.
  4. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu un capteur de position, qui détecte le positionnement de la course de la pompe ou une position comparable de la transmission et du rotor, et en ce que la limitation de courant s'effectue d'après une courbe préétablie (8, 9), à partir d'une position détectée prédéterminée.
  5. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que le capteur de position ne délivre un signal qu'une fois par cycle de travail, de préférence dans la région médiane d'une course de travail.
  6. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que la limitation de courant du moteur s'effectue également en fonction de la vitesse de course attendue.
  7. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que la limitation de courant s'effectue aussi en fonction de la pression devant être appliquée par la pompe.
  8. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que des moyens de détection de la pression appliquée par la pompe sont prévus ou en ce que la pression maximale devant être apportée par la pompe est pré-établie.
  9. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce qu'il est prévu un dynamomètre dans la région des moyens d'actionnement oscillants.
  10. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que pour l'établissement de la courbe de limitation de courant (8, 9), le courant envoyé au moteur est abaissé par paliers, jusqu'à ce que la vitesse du moteur descende en dessous de sa valeur de consigne, et la limitation de courant effectuée auparavant limite en haut la courbe de limitation de courant, au moins à ce stade.
  11. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce qu'à l'aide de la courbe de limitation de courant, la pression de travail de la pompe est détectée par prise en compte de la vitesse.
  12. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que l'abaissement par paliers de la courbe de limitation de courant s'effectue sur des intervalles auxquels correspondent respectivement une course de travail et une course de retour de la machine en action, et en ce que, s'il est déterminé sur la base de l'abaissement du courant que le moteur n'a pas atteint sa position attendue, le moteur est excité avec la pleine intensité du courant, jusqu'à ce qu'il ait atteint la position attendue, après quoi le palier établi auparavant de la courbe de limitation de courant (8, 9) est activé.
  13. Pompe de dosage selon l'une des revendications précédentes, caractérisée en ce que la courbe de limitation de courant est choisie de telle façon qu'il ne se produise pas de cavitation lors de la course d'aspiration de la pompe.
EP20010116892 2000-07-12 2001-07-11 Pompe de dosage avec commande du courrant du moteur Expired - Lifetime EP1172560B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000133992 DE10033992A1 (de) 2000-07-12 2000-07-12 Fördervorrichtung mit einem stromgesteuerten Motor
DE10033992 2000-07-12

Publications (3)

Publication Number Publication Date
EP1172560A2 EP1172560A2 (fr) 2002-01-16
EP1172560A3 EP1172560A3 (fr) 2003-11-26
EP1172560B1 true EP1172560B1 (fr) 2005-11-09

Family

ID=7648744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010116892 Expired - Lifetime EP1172560B1 (fr) 2000-07-12 2001-07-11 Pompe de dosage avec commande du courrant du moteur

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EP (1) EP1172560B1 (fr)
DE (2) DE10033992A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013113576A1 (de) * 2013-12-05 2015-06-11 Prominent Gmbh Sensorlose Störungserkennung bei Dosierpumpen mit Schrittmotor
DE102017204077A1 (de) * 2017-03-13 2018-09-13 Robert Bosch Gmbh Verfahren zum Betrieb einer Hubmagnetpumpe und Computerprogrammprodukt

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321014A (en) * 1979-12-31 1982-03-23 Polaroid Corporation Constant flow pumping apparatus
US5141402A (en) * 1991-01-29 1992-08-25 Vickers, Incorporated Power transmission
DE4115295A1 (de) * 1991-05-10 1992-11-12 Telefunken Electronic Gmbh Schaltungsanordnung zur steuerung und ueberwachung eines laststromes
DE4123219B4 (de) * 1991-07-12 2005-09-01 Adolf Strobl Feinputz- oder Farbpumpe
JPH07115791A (ja) * 1993-10-13 1995-05-02 Nippondenso Co Ltd 電気自動車用制御装置
US5980211A (en) * 1996-04-22 1999-11-09 Sanyo Electric Co., Ltd. Circuit arrangement for driving a reciprocating piston in a cylinder of a linear compressor for generating compressed gas with a linear motor
DE19623537C2 (de) * 1996-06-13 2002-03-28 Bwt Wassertechnik Gmbh Dosierpumpe und Dosierverfahren für Flüssigkeiten

Also Published As

Publication number Publication date
DE10033992A1 (de) 2002-01-31
EP1172560A2 (fr) 2002-01-16
EP1172560A3 (fr) 2003-11-26
DE50107956D1 (de) 2005-12-15

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