EP1256723B1 - Motor pump unit controlled by electric current analysis - Google Patents

Motor pump unit controlled by electric current analysis Download PDF

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Publication number
EP1256723B1
EP1256723B1 EP02290925A EP02290925A EP1256723B1 EP 1256723 B1 EP1256723 B1 EP 1256723B1 EP 02290925 A EP02290925 A EP 02290925A EP 02290925 A EP02290925 A EP 02290925A EP 1256723 B1 EP1256723 B1 EP 1256723B1
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European Patent Office
Prior art keywords
motor
phase
current
microprocessor
pump
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EP02290925A
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German (de)
French (fr)
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EP1256723A1 (en
Inventor
Pascal Vinzio
Louis Symoens
Jacques Berthon
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KSB SAS
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KSB SAS
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    • 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
    • F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
    • F04D15/0254—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump the condition being speed or load
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Electric Motors In General (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Amplifiers (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Flow Control (AREA)

Abstract

The motor pump includes a high liquid level sensor (6) connected to an input of a microprocessor (8) and out of phase measuring system for measuring so as to send a start signal to the motor or pump only when the sensors detects a high liquid level. An out of phase stability monitoring unit includes a system for measuring the current level and includes an intermediate liquid level sensor (7) which detects a level between high and low corresponding to motor voltage cutoff. The immersed motor/pump unit includes a pump (2) and AC motor (1) having at least a working phase and a microprocessor integrated in one of the inputs to which a supply voltage is applied and to another input from which is sent a signal representing the current absorbed in the motor phase. The microprocessor includes a system for measuring the phase difference between voltage and current. The microprocessor includes: (a) A system for continuous monitoring of the phase difference stability after it has settled at a constant value; (b) Memory for storing out of phase values, and; (c) Supply voltage cutoff switches which interrupt the supply voltage to the motor when, after out of phase is stabilized, the out of phase value, during a set time period, reaches a value greater than the stabilized value and the signal representing the absorbed current is the current passing only through the working phase.

Description

La présente invention se rapporte aux groupes motopompes et s'applique tout particulièrement aux groupes motopompes immergés, destinés notamment à relever des effluents et tout particulièrement à des pompes de petite puissance, inférieure à 4 kW dont le couplage du bobinage moteur est en étoile (bobinage par phase du moteur).The present invention relates to groups motor pumps and is particularly applicable to motor pump units immersed, intended in particular to collect effluents and especially pumps with a capacity of less than 4 kW, the coupling of which motor winding is in star (winding by motor phase).

Au US-A 5 015 531, on décrit un groupe motopompe destiné à pomper du pétrole. Il s'agit d'un groupe motopompe de grande puissance dont le couplage du bobinage moteur est nécessairement en triangle, compte tenu de la puissance du moteur, et comme le souligne l'indication, dès la ligne 10 de la première colonne, de l'utilisation de démarreurs doux qui s'appliquent pour des pompes de grande puissance. Le groupe motopompe comprend des moyens de mesure d'un paramètre qui peut être le déphasage entre la tension et le courant, bien que dans l'exemple concret de réalisation le paramètre soit seulement le courant. On mesure le courant éventuellement le cosinus phi toutes les 25 s dans l'exemple de réalisation. On préconise d'effectuer cet échantillonnage tous les quarts de seconde à 15 min. Le signal représentatif du courant absorbé est le courant passant dans les phases d'alimentation et non pas directement dans la phase de travail. La présente invention ne vise pas de moteur de ce genre de grande puissance à couplage du bobinage moteur en triangle comme cela est décrit également au US-4 473 338.In US Pat. No. 5,015,531, a pump unit is described. intended to pump oil. This is a large motor pump group power whose coupling of the motor winding is necessarily in triangle, considering the power of the engine, and as underlined the indication, in row 10 of the first column, of the use of soft starters that apply for high power pumps. The pump set comprises means for measuring a parameter which can be the phase shift between the voltage and the current, although in the example concrete realization the parameter is only the current. We measure the possibly running the cosine phi every 25s in the example of production. It is recommended to carry out this sampling every quarter of second at 15 min. The signal representative of the absorbed current is the current passing through the feeding phases and not directly into the phase working. The present invention is not directed to an engine of this kind high power coupled motor winding in a triangle like this is also described in US-4,473,338.

Un groupe motopompe de petite puissance comprend une pompe entraínée par un moteur électrique à courant alternatif, ayant au moins une phase de travail. Le moteur peut être notamment un moteur monophasé ou un moteur triphasé. Le groupe motopompe est destiné à être placé dans une fosse ou dans une cuve et à être mis en route, lorsque c'est nécessaire pour vider la fosse. Lorsque la fosse est presque vide, il est connu de prévoir un capteur de niveau bas, notamment intégré au groupe motopompe, qui donne l'ordre d'arrêter le moteur et donc la pompe, afin que celle-ci ne fonctionne pas à vide. Le flotteur qui est situé à un niveau très bas dans la fosse s'encrasse beaucoup. Bien qu'il soit disposé aussi bas que possible, il subsiste nécessairement, des effluents dans le bas de la fosse, qui entraínent des problèmes de colmatage et d'odeur. En outre, le réglage et l'installation d'un capteur de niveau bas de ce genre, sont compliqués et l'entretien en est fastidieux.A small power pump unit includes a pump driven by an AC electric motor, having at least one phase of work. The engine may be an engine single-phase or a three-phase motor. The pump unit is intended to be placed in a pit or a tank and to be started, when it is necessary to empty the pit. When the pit is almost empty, it is known to provide a low level sensor, in particular integrated in the group motor pump, which gives the order to stop the engine and therefore the pump, so that it does not work empty. The float which is located at a very low level in the pit gets dirty a lot. Although he is willing as low as possible, it necessarily remains, effluents in the bottom of the pit, which causes problems of clogging and odor. In addition, the setting and installing a low level sensor of this type, are complicated and the maintenance is tedious.

On a déjà proposé d'arrêter le groupe motopompe par analyse du comportement du moteur en mesurant le déphasage entre la tension et le courant. A l'instant où la pompe commence à aspirer de l'air, le cosinus phi varie. Dès que ce cosinus atteint une valeur prescrite, la pompe est arrêtée. Cette manière de procéder est sensible aux variations de la tension d'alimentation, impose une grande différence de la puissance prise par la pompe en charge et à vide et entraíne des risques de perturbations de l'interprétation de la mesure si les paramètres du groupe motopompe évoluent.It has already been proposed to stop the pump unit by analysis of the motor behavior by measuring the phase difference between the voltage and current. At the moment the pump begins to draw in air, the cosine phi varies. As soon as this cosine reaches a prescribed value, the pump is stopped. This way of proceeding is sensitive to variations in supply voltage, imposes a big difference of the power taken by the pump in charge and empty and entails the risk of disturbances of the interpretation of the measurement if the parameters of the pump set evolve.

L'invention remédie à ces inconvénients par un groupe motopompe, qui se dispense d'un capteur de niveau bas et qui élimine du coup toutes les difficultés d'installation, d'entretien, d'odeur et de colmatage du fond de la cuve, et qui permet de vider vraiment complètement la cuve, sans prendre pour autant le risque que la pompe ne soit plus alimentée et travaille à vide, tout en étant peu sensible aux variations de la tension d'alimentation et aux perturbations de la mesure si les paramètres du groupe motopompe se modifient et sans imposer de différence de la puissance prise par la pompe en charge et à vide. On cherche à obtenir un arrêt immédiat, et non pas seulement une régulation à terme, s'il y a danger de réamorçage.The invention overcomes these disadvantages by a group motor pump, which dispenses with a low level sensor and eliminates all the difficulties of installation, maintenance, odor and clogging the bottom of the tank, and that allows to completely empty the tank, without taking the risk that the pump is no longer powered and works empty, while being insensitive to changes in voltage supply and disturbance of the measurement if the parameters of the group motor pump are modified and without imposing a difference of the power taken by the pump under load and empty. We are seeking an immediate halt, and not just a term regulation, if there is a danger of rebooting.

L'invention a donc pour objet un groupe motopompe comprenant une pompe entraínée par un moteur électrique à courant alternatif ayant au moins une phase de travail, et un microprocesseur intégré à l'une des entrées duquel est appliquée la tension du secteur d'alimentation, et à une autre entrée duquel est envoyé un signal représentatif du courant absorbé dans la phase de travail du moteur. Suivant l'invention, le microprocesseur comprend des moyens destinés à mesurer le déphasage entre la tension et le courant, des moyens de constatation en continu de la stabilité du déphasage après qu'il s'est stabilisé à une valeur constante, des moyens de mémorisation de la valeur stabilisée constante du déphasage, et des moyens de mise hors tension du moteur, lorsque, après que le déphasage s'est stabilisé, le déphasage prend, pendant une durée prescrite, une valeur supérieure à la valeur stabilisée.The subject of the invention is therefore a pump unit comprising a pump driven by a current electric motor alternative having at least one work phase, and an integrated microprocessor at one of the inputs of which the mains voltage is applied, and at another input of which is sent a signal representative of the current absorbed in the working phase of the engine. According to the invention, the microprocessor comprises means for measuring the phase shift between the voltage and the current, means for continuously ascertaining the stability of the phase shift after it has stabilized at a constant value, means for storing the constant stabilized value of the phase shift, and means for switching off the motor, when, after the phase shift has stabilized, the phase shift takes, for a prescribed duration, a value greater than the stabilized value.

On détermine que le niveau le plus bas, c'est-à-dire que la fosse est complètement vide, est atteint, en analysant d'une manière particulière le comportement électrique du moteur du groupe motopompe. Après une phase transitoire, lors du démarrage de la pompe, dans laquelle le déphasage entre la tension et le courant peut varier beaucoup, ce déphasage est constant lorsque la pompe atteint un régime établi. Mais lorsque la pompe du groupe commence à aspirer de l'air, d'une manière régulière et non pas seulement une simple bulle d'air accidentelle, le déphasage prend une valeur supérieure à la valeur stabilisée. C'est le signe qu'il faut arrêter la pompe, dans la mesure où cette valeur supérieure à la valeur stabilisée est obtenue pendant une certaine durée. Comme l'on mémorise le cosinus de charge en régime établi du groupe motopompe, le calibrage se refait à chaque mise en route du groupe motopompe et prend en compte les évolutions de la pompe, du réseau électrique et du réseau hydraulique (colmatage de tuyauterie, étanchéité du clapet, etc...). Le rapport entre la charge réelle et la puissance du moteur n'intervient plus.It is determined that the lowest level, that is, the pit is completely empty, is reached, analyzing in a way particular the electrical behavior of the motor of the pump set. After a transitional phase, when starting the pump, in which the phase shift between voltage and current can vary a lot, this phase shift is constant when the pump reaches a steady state. But when the pump the group starts to suck air, in a regular way and not only a simple accidental air bubble, the phase shift takes on a value greater than the stabilized value. This is the sign that the pump must be stopped, since this value greater than the stabilized value is obtained for a certain period. As we remember the charge cosine in set speed of the pump set, the calibration is repeated every time it is road of the pump unit and takes into account the evolutions of the pump, the electrical network and the hydraulic network (clogging of piping, sealing of the valve, etc ...). The ratio of actual load to power motor does not intervene anymore.

On a obtenu de bons résultats lorsque ladite durée prescrite est supérieure à 200 ms et est inférieure à 5 s, avec une préférence pour une durée comprise entre 200 ms et 1 s.Good results have been obtained when said duration prescribed is greater than 200 ms and less than 5 s, with a preference for a duration of between 200 ms and 1 s.

Le signal représentatif du courant absorbé est le courant passant seulement dans la phase de travail (bobinage par phase du moteur). On peut prendre ce courant à l'aide d'une chaíne de mesure, d'un transformateur de courant, ou également aux bornes d'un interrupteur de type triac, ce qui est actuellement la solution préférée.The signal representative of the absorbed current is the current passing only in the phase of work (winding by phase of the engine). We can take this current using a measuring chain, a current transformer, or also at the terminals of a switch of the type triac, which is currently the preferred solution.

Le groupe motopompe peut comprendre un capteur de niveau haut du liquide à véhiculer, relié à une entrée du microprocesseur, de manière à envoyer un signal de mise en marche du groupe motopompe et des moyens de mesure du déphasage, seulement lorsque le capteur détecte un niveau haut. Le microprocesseur reste ainsi en état de veille et n'entre en action que lorsque le groupe motopompe fonctionne.The pump set may comprise a sensor high level of the liquid to be conveyed, connected to an input of the microprocessor, of to send a signal to start the pump set and phase shift measuring means, only when the sensor detects a high level. The microprocessor thus remains in a standby state and does not enter action only when the pump set is running.

Les moyens de constatation de la stabilité du déphasage peuvent comprendre des moyens de mesure de la constance du courant. Les moyens de constatation de la stabilité du déphasage comprennent un capteur de niveau intermédiaire du liquide, détectant un niveau compris entre le niveau haut détecté par le capteur de niveau haut et un niveau bas, correspondant à la mise hors tension du moteur. Ces moyens de constatation à capteur de niveau intermédiaire sont relativement simples et très sûrs. Un mode de réalisation plus simple et moins sûr est décrit au US-5 015 151 dans lequel, les moyens de constatation de la stabilité du déphasage peuvent comprendre une minuterie qui est déclenchée par le signal du capteur de niveau, et qui, après une durée d'écoulement prescrite, décide que le déphasage est stable. Si en effet, une certaine durée d'écoulement de 4 à 5 s s'est écoulée alors que le déphasage est stable, on peut considérer que l'on n'est plus dans la phase transitoire. Les moyens de constatation fonctionnent en continu et réagissent immédiatement à toute variation instantanée du cosinus phi.Means for recognizing the stability of the phase shift may include means for measuring the constancy of the current. Means for recognizing the stability of the phase shift include an intermediate level sensor of the liquid, detecting a level between the high level detected by the high level sensor and a low level, corresponding to the power off of the engine. These means Intermediate-level sensing findings are relatively simple and very safe. A simpler embodiment and less safe is described in US-5,015,151 in which, the means for recognizing the stability of the phase shift may include a timer that is triggered by the signal from the level sensor, which, after a prescribed flow time, decides that the phase shift is stable. If indeed, a certain duration of flow of 4 to 5 s has elapsed while the phase shift is stable, we can consider that we are no longer in the transitional phase. The means of recognition operate continuously and respond immediately to any variation instantaneous phi cosine.

Aux dessins annexés donnés uniquement à titre d'exemple :

  • la figure 1 est une vue schématique en coupe d'un groupe motopompe monté dans une fosse, et
  • la figure 2 est un schéma du circuit électrique du groupe motopompe.
    • In the accompanying drawings given solely by way of example:
  • Figure 1 is a schematic sectional view of a pump unit mounted in a pit, and
  • Figure 2 is a diagram of the electric circuit of the pump unit.

    • Le groupe motopompe représenté à la figure 1 est placé dans une fosse F. Il comprend un moteur qui entraíne une pompe 2 centrifuge, ayant une jupe 3 d'aspiration et une tubulure 4 de refoulement, véhiculant les effluents contenus dans la fosse F à l'extérieur de celle-ci. Le moteur 1 est alimenté en courant, par l'intermédiaire de ligne 5 d'alimentation par le secteur S. Sur le moteur 1 est fixé un capteur 6 de niveau haut, qui est susceptible de détecter le niveau des effluents dans la fosse F. En dessous de ce capteur 6, est monté sur le moteur 1 un capteur 7 de niveau intermédiaire.The pump unit shown in Figure 1 is placed in a pit F. It includes a motor that drives a pump 2 centrifugal, having a suction skirt 3 and a delivery pipe 4, conveying the effluents contained in the pit F on the outside thereof. The motor 1 is supplied with power, via power line 5 by the sector S. On the engine 1 is fixed a sensor 6 of high level, which is likely to detect the level of effluent in pit F. Below of this sensor 6, is mounted on the motor 1 a level sensor 7 intermediate.

    A l'intérieur du compartiment moteur, est logé un microprocesseur 8, relié par une ligne 9 à un circuit 10 de mesure du courant passant dans une phase de travail du moteur 1.Inside the engine compartment, is housed a microprocessor 8, connected by a line 9 to a current measuring circuit 10 passing into a working phase of the engine 1.

    A la figure 2, le moteur est un moteur monophasé, qui comprend une phase principale 11 ou phase de travail et une phase auxiliaire 12, laquelle est en série avec un condensateur 13. Le moteur 1 est commandé par un dispositif 14 de commande. Un signal de tension pris sur l'alimentation 5 vient par une ligne 15 à une borne du microprocesseur 8. Un signal de référence vient par une ligne 16, de l'alimentation S, à une entrée du microprocesseur 8. In FIG. 2, the motor is a single-phase motor, which includes a main phase 11 or work phase and a phase 12, which is in series with a capacitor 13. The motor 1 is controlled by a control device 14. A voltage signal taken on the power supply 5 comes through a line 15 to a terminal of the microprocessor 8. A reference signal comes through a line 16, from the S supply, to an input of the microprocessor 8.

    Le microprocesseur reçoit par une ligne 17, un signal du capteur 6 de niveau haut. Le microprocesseur 8 mesure en continu le déphasage entre le signal de tension appliqué par la ligne 15 et le signal de courant appliqué par la ligne 9.The microprocessor receives, via a line 17, a signal from sensor 6 high level. The microprocessor 8 continuously measures the phase shift between the voltage signal applied by line 15 and the signal of current applied by line 9.

    Le microprocesseur 8 est relié par une ligne 18 à des moyens 19 de mémorisation du déphasage en régime établi. Le dispositif 19 de mémorisation de la valeur stabilisée du déphasage est relié par une ligne 20 à un comparateur 21, lequel est relié, par une ligne 22, à un dispositif 23 de mémorisation de la valeur instantanée du déphasage, valeur fournie par le microprocesseur 8, par l'intermédiaire d'une ligne 24. La comparaison dans le comparateur 21 entre la valeur stabilisée du déphasage fournie par le dispositif 19 et la valeur instantanée du déphasage fournie par le dispositif 23, est envoyée à un dispositif 25 par l'intermédiaire d'une ligne 26. Ce dispositif 25 détermine si la valeur instantanée du déphasage est supérieure à la valeur stabilisée. Si c'est le cas, il envoie par une ligne 27 à une minuterie 28, un signal correspondant et la minuterie 28 détermine si la durée qui s'écoule pendant que le dispositif 25 émet le signal en question, est supérieure à 200 ms. Si c'est le cas, la minuterie 28 envoie par une ligne 29, un ordre d'arrêt du moteur, à un dispositif 30 marche/arrêt qui le transmet par une ligne 31 au dispositif 14 de commande du moteur. Le microprocesseur 8 est relié au dispositif 30 de marche/arrêt, par une ligne 32 permettant de mettre le moteur 1 sous tension.The microprocessor 8 is connected by a line 18 to means 19 for storing the phase shift in steady state. The device 19 storing the stabilized value of the phase shift is connected by a line 20 to a comparator 21, which is connected by a line 22 to a device 23 storing the instantaneous value of the phase shift, a value provided by the microprocessor 8, via a line 24. The comparison in the comparator 21 between the stabilized value of the phase shift provided by the device 19 and the instantaneous value of the phase shift provided by the device 23, is sent to a device 25 via a line 26. This device 25 determines whether the instantaneous value of the phase shift is greater than the value stabilized. If so, it sends a line 27 to a timer 28, a corresponding signal and the timer 28 determines whether the time elapses while the device 25 transmits the signal in question, is greater than 200 ms. If this is the case, the timer 28 sends a line 29, an order stopping the engine, to a device 30 on / off which transmits it by a line 31 to the device 14 for controlling the engine. The microprocessor 8 is connected to the device 30 on / off, by a line 32 to put the motor 1 under power.

    Tout l'agencement 8 à 30 est constitué de préférence sous la forme d'un logiciel.The entire arrangement 8 to 30 preferably consists of in the form of software.

    Le capteur 7 de niveau intermédiaire est relié au microprocesseur 8, par une ligne 33.The intermediate level sensor 7 is connected to the microprocessor 8, by a line 33.

    Le groupe motopompe fonctionne de la manière suivante.The pump set works as follows.

    Lorsque le niveau de l'eau dans la fosse 1 atteint le niveau haut détecté par le capteur 6, le capteur 6 envoie par la ligne 17 un signal au microprocesseur 8, lequel envoie par la ligne 32, un signal au dispositif 30 de marche/arrêt. Le dispositif 30 donne l'ordre par la ligne 31 au dispositif 14 de commande, de mettre le moteur 1 en route. La pompe 2 fonctionne. Le niveau de l'eau s'abaisse au niveau du capteur 7 intermédiaire. Celui-ci envoie par la ligne 33 un signal au microprocesseur 8 de constatation, du déphasage entre la tension et le courant. Le microprocesseur 8 mesure ou constate alors le déphasage entre la tension et le courant et envoie la valeur stabilisée de ce déphasage au dispositif 19 de mémorisation par la ligne 18. Alors que le groupe motopompe continue à fonctionner et que l'eau continue à s'abaisser dans la fosse F, le microprocesseur 8 envoie en permanence par la ligne 24, au dispositif 23, la valeur instantanée du déphasage entre le courant et la tension fournis par les lignes 9 et 15. Lorsque ce déphasage atteint une valeur supérieure à la valeur stabilisée, le comparateur 21 qui compare les valeurs que lui fournit le dispositif 19 et le dispositif 23, envoie par la ligne 26 un signal au dispositif 25. Le dispositif 25 constate si le déphasage est supérieur à une valeur donnée d'un montant déterminé. Si c'est le cas, il envoie un signal par la ligne 27 à la minuterie 28, laquelle détermine si elle reçoit ce signal pendant une durée prescrite. Si c'est le cas, la minuterie 28 donne l'ordre par la ligne 29 au dispositif 30 de marche/arrêt, d'envoyer un signal 31 au dispositif 14 de commande d'arrêt du moteur 1.When the level of water in pit 1 reaches the level detected by the sensor 6, the sensor 6 sends via the line 17 a signal to the microprocessor 8, which sends via line 32, a signal to the device 30 of On Off. The device 30 gives the command via line 31 to the device 14 of command, to start the engine 1. Pump 2 works. The water level drops to the level of the intermediate sensor 7. This one sends on line 33 a signal to the microprocessor 8 for finding, phase shift between voltage and current. The microprocessor 8 measures or then sees the phase shift between the voltage and the current and sends the value stabilized of this phase shift at the storage device 19 by the line 18. As the pump unit continues to operate and the water continues to lower in the pit F, the microprocessor 8 sends permanently through line 24, the device 23, the instantaneous value of the phase difference between the current and voltage provided by lines 9 and 15. When this phase shift reaches a value greater than the stabilized value, the comparator 21 which compares the values provided by the device 19 and the device 23, sends by line 26 a signal to the device 25. The device 25 ascertains whether the phase shift is greater than a given value by a specified amount. Yes this is the case, it sends a signal through line 27 to timer 28, which determines whether it receives this signal for a prescribed time. If that is the case, the timer 28 gives the command via line 29 to the on / off device 30, to send a signal 31 to the engine stop control device 14 1.

    Suivant un autre mode de réalisation, le capteur 7 de niveau intermédiaire est remplacé par une minuterie 7 qui est déclenchée par le signal du capteur 6 de niveau haut et qui, après une durée d'écoulement prescrite, décide que le déphasage entre le courant fourni par la ligne 9 et la tension fournie par la ligne 15 est stableAccording to another embodiment, the sensor 7 of intermediate level is replaced by a timer 7 which is triggered by the signal of the high level sensor 6 and which, after a duration of flow prescribed, decides that the phase difference between the current supplied by line 9 and the voltage provided by line 15 is stable

    Suivant un autre mode de réalisation, les moyens de constatation de la stabilité du déphasage comprennent des moyens dans le microprocesseur 8 de mesure de la constance du courant fourni par la ligne 9.According to another embodiment, the means of recognition of the stability of the phase shift comprise means in the microprocessor 8 for measuring the constancy of the current supplied by line 9.

    Claims (3)

    1. Motor-driven pump set comprising a pump (2) driven by an alternating current electric motor (1), having at least one working phase (11) (winding for each phase of the motor) and an integrated microprocessor (8) to one of the inputs of which is applied the mains power supply voltage and to another input of which is sent a signal representative of the current absorbed in the working phase (11) of the motor (1), the microprocessor (8) comprising means (8) designed to measure the phase difference between the voltage and the current, means (7) of continuously monitoring the stability of the phase difference, after it is stabilized at a constant value, means (19) of memorizing the stabilized constant value of the phase difference and means (21 to 28) of powering down the motor (1), when, after the phase difference is stabilized, the phase difference assumes, for a defined duration, a value greater than the stabilized value and the signal representative of the current absorbed is the current passing only through the working phase (11), characterized in that the means of monitoring the stability of the phase difference comprise an intermediate liquid level sensor (7), detecting a level between the high level detected by the high level sensor (6) and a low level corresponding to powering down of the motor (1).
    2. Motor-driven pump set according to Claim 1, characterized in that the motor-driven pump set comprises a sensor (6) detecting a high level of the liquid to be conveyed, linked to an input of the microprocessor (8), so as to send a signal to switch on the motor-driven pump set and means (8) of measuring the phase difference, only when the sensor (6) detects a high level.
    3. Motor-driven pump set according to one of the preceding claims, characterized in that the means of monitoring the stability of the phase difference comprise means (8) of measuring the constancy of the current.
    EP02290925A 2001-05-09 2002-04-12 Motor pump unit controlled by electric current analysis Expired - Lifetime EP1256723B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    DK02290925T DK1256723T3 (en) 2001-05-09 2002-04-12 Motor pump unit whose shutdown is controlled by flow analysis

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0106106A FR2824600B1 (en) 2001-05-09 2001-05-09 MOTOR PUMP GROUP WHICH SHUT DOWN BY CURRENT ANALYSIS
    FR0106106 2001-05-09

    Publications (2)

    Publication Number Publication Date
    EP1256723A1 EP1256723A1 (en) 2002-11-13
    EP1256723B1 true EP1256723B1 (en) 2005-07-06

    Family

    ID=8863069

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP02290925A Expired - Lifetime EP1256723B1 (en) 2001-05-09 2002-04-12 Motor pump unit controlled by electric current analysis

    Country Status (7)

    Country Link
    EP (1) EP1256723B1 (en)
    AT (1) ATE299243T1 (en)
    DE (1) DE60204923T2 (en)
    DK (1) DK1256723T3 (en)
    ES (1) ES2246005T3 (en)
    FR (1) FR2824600B1 (en)
    PT (1) PT1256723E (en)

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2860271B1 (en) * 2003-09-30 2008-05-02 Realisations Electroniques Eur DEVICE FOR PROTECTING IMMERED PUMPS
    FR2896048B1 (en) * 2006-01-11 2008-07-04 Realisations Electroniques Eur METHOD AND DETECTION SYSTEM FOR AN ELECTRICAL DEVICE
    FR2951267B1 (en) * 2009-10-14 2011-10-28 Peugeot Citroen Automobiles Sa DEVICE FOR DETECTING THE LEVEL OF LIQUID IN A RESERVOIR
    DE102009053322B4 (en) 2009-11-17 2019-10-17 Endo-Technik Wolfgang Griesat Gmbh Device for controlling the flow of a peristaltic pump
    CN203962360U (en) * 2014-07-11 2014-11-26 君禾泵业股份有限公司 The automatic control of pump electronic water level switch
    CN104481891B (en) * 2014-11-27 2019-01-15 浙江富士精工科技有限公司 Air-conditioning drainage pump

    Family Cites Families (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4473338A (en) * 1980-09-15 1984-09-25 Garmong Victor H Controlled well pump and method of analyzing well production
    US5015151A (en) * 1989-08-21 1991-05-14 Shell Oil Company Motor controller for electrical submersible pumps
    US5833437A (en) * 1996-07-02 1998-11-10 Shurflo Pump Manufacturing Co. Bilge pump

    Also Published As

    Publication number Publication date
    FR2824600A1 (en) 2002-11-15
    ATE299243T1 (en) 2005-07-15
    FR2824600B1 (en) 2004-02-20
    DE60204923D1 (en) 2005-08-11
    DK1256723T3 (en) 2005-10-17
    ES2246005T3 (en) 2006-02-01
    EP1256723A1 (en) 2002-11-13
    PT1256723E (en) 2005-11-30
    DE60204923T2 (en) 2006-05-24

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