EP0903497A1 - Submersible effluent pump - Google Patents

Submersible effluent pump Download PDF

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Publication number
EP0903497A1
EP0903497A1 EP98402134A EP98402134A EP0903497A1 EP 0903497 A1 EP0903497 A1 EP 0903497A1 EP 98402134 A EP98402134 A EP 98402134A EP 98402134 A EP98402134 A EP 98402134A EP 0903497 A1 EP0903497 A1 EP 0903497A1
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EP
European Patent Office
Prior art keywords
level
pump
effluent
detector
control circuit
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Granted
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EP98402134A
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German (de)
French (fr)
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EP0903497B1 (en
Inventor
Nicolas Markovits
Louis Symoens
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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
    • F04D15/0209—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
    • 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
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/025—Stopping, starting, unloading or idling control by means of floats

Definitions

  • the function of the lifting pumps is to transfer the effluents from a receptacle, in particular from a collecting tank or a sump, to an evacuation pipe on a higher level.
  • the transfer fluids can be aggressive, hot or cold, charged and have a variable density.
  • the command to start and stop the lifting pumps are carried out by automatic devices depending on the level of the liquid in the receptacle.
  • JP 04 183991A describes an electric pump group having three level detectors mounted on the receptacle, two of them triggering each a timer. The pump stops at the end of the time period which expires first. Often there is a lot of effluent in the receptacle.
  • This Japanese document plans to use a pump that does not prime and aims to prevent the liquid residue in the pump when the pump is running empty receptacle is too agitated and heated and produces foam which harms the good subsequent operation of the pump.
  • US 4 311438A provides for measuring the operating time of the pump motor from its last start-up and control the stop time starting at the end of this operating time in function of the previous operating time by increasing the duration when the operating times decrease. It often happens that the receptacle is also not well emptied.
  • the invention overcomes these drawbacks with an electric pump group submersible which allows to obtain an effluent residue in the receptacle also as small as possible, while using static sensors not requiring maintenance.
  • the subject of the invention is therefore a submersible electric pump group. intended for lifting effluent contained in a receptacle, comprising a pump driven by an electric motor controlled by a circuit ordered.
  • a first effluent level detector in the receptacle is preferably mounted on the pump first level and sends a first change signal to the control circuit as soon as the effluent reaches the first level.
  • a second detector level of the effluent in the receptacle is preferably mounted on the pump at a second level lower than the first and sends to the control circuit a second state change signal as soon as the effluent has reached a level lower than the second level.
  • the control circuit includes means to determine the period of time between the dispatch of the first signal and the second signal and intended to calculate, from this lapse of time, the time remaining from the sending of the second signal for stop the engine.
  • a pump priming sensor is provided intended to send to the control circuit, as soon as the defusing of the pump starts, priority override signal.
  • the submersible pump unit for lifting effluent contained in the tank C comprises a pump 1 driven by a motor 2 electric controlled by a control circuit 3.
  • the pump has a suction opening 4 facing downwards and discharge pipe 5 opening out of tank C.
  • a level sensor 6 is mounted at a higher NH level on the casing of the electric pump.
  • a second level sensor 8 is mounted at an intermediate NM level on the casing 7. The two sensors are connected by conductors to control circuit 3, which takes the form of a printed circuit board.
  • the control circuit shown in Figure 2 includes a conductor 9 connecting the sensor 6 to an AND gate 10 as well as a conductor 28 connecting the sensor 8 to the AND gate 10.
  • the AND gate 10 is connected by a conductor 11 to a time counter 12, which measures the time which flows between the passage of the effluent from the NH level to the NM level and which calculates, from this duration, the duration that remains to elapse so that the level of effluent in tank C reaches a level NB (figure 1) higher than the level at which the pump is primed.
  • the counter 12 is connected by a conductor 13 to an OR gate 14. It is connected by a conductor 15 to a clock 16, which is connected by a conductor 17 at OR gate 14.
  • the output of OR gate 14 is connected by a conductor 18 to an AND gate 19.
  • a defuse sensor 20, which can preferably be a motor intensity or cosine capteur sensor of the motor 2 is connected by a conductor 21 to the AND gate 19.
  • the door output AND 19 is connected by a conductor 22 to a power relay 23 which supplies the motor 2 by a conductor 24.
  • the sensor 8 is connected by a conductor 25 to a NAND gate 26 the output of which is connected by a conductor 27 to the clock 16.
  • the submersible electric pump group according to the invention operates from the following way.
  • the sensor 6 sends by driver 9, door 10, driver 11, counter 12, conductor 13, door 14, conductor 18, door 19 and conductor 22, a change of state signal to the power relay 23, which sets in motion, by driver 24, motor 2.
  • Pump 1 operates and discharges the effluent through the discharge pipe 5.
  • the level in the tank C decreases.
  • the sensor 8 detects it. He sends, by the door 10 and by the conductor 11, a state change signal at the counter 12, which calculates the time that has elapsed since the start of the the pump 2.
  • the counter 12 calculates the time which remains to elapse so that, under the conditions in which the lifting is carried out, the level in the tank C reaches NB level and transmits this information by the driver 15 to the clock 16.
  • the sensor 8 sends at the same time, via the conductor 25, information at the NAND gate 26 and, by the driver 27, at the clock 16.
  • the clock 16 thus determines the remaining time during which the pump 1 must operate and sends a corresponding signal by the conductor 17, the gate 14, conductor 18, gate 19 and conductors 22 to relay 23 of power. This ceases to supply the motor 2 of the pump 1, as soon as this duration has elapsed.
  • the senor 20 If the sensor 20 detects a defusing, it sends, by the conductor 21, door 19 and driver 22, a priority order over all the others, which switches relay 23 off.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The level detectors provides signals indicating level change, with timing circuit determining duration of pump action necessary. The submersible pump includes a pump (1) driven by an electric motor (2) controlled by a control circuit (3). The whole assembly is intended to be submerged in a container (C) holding effluent. The control circuit includes a first detector (6) sensing the level of effluent in the container providing a change of state signal when the level reaches a first level (NH). A second detector (8) determines when the level falls below a second level (NM) which is lower than the first level. The circuit includes provision to determine the time elapsing between the change of state of the first detector and the change of state of the second detector, in order to control the operating time necessary for the operation of the pump. The two detectors may be mounted on the pump itself.

Description

Les pompes de relevage ont pour fonction de réaliser le transfert des effluents d'un réceptacle, notamment d'une cuve collectrice ou d'un puisard, vers une canalisation d'évacuation se trouvant à un niveau supérieur. Les fluides à transvaser peuvent être à la fois agressifs, chauds ou froids, chargés et avoir une densité variable. La commande de mise en marche et d'arrêt des pompes de relevage s'effectue par l'intermédiaire de dispositifs automatiques en fonction du niveau du liquide dans le réceptacle.The function of the lifting pumps is to transfer the effluents from a receptacle, in particular from a collecting tank or a sump, to an evacuation pipe on a higher level. The transfer fluids can be aggressive, hot or cold, charged and have a variable density. The command to start and stop the lifting pumps are carried out by automatic devices depending on the level of the liquid in the receptacle.

Les dispositifs de commande généralement utilisés sont les suivants :

  • Flotteurs qui donnent le niveau haut et le niveau bas de l'effluent.
  • Détection du niveau par des dispositifs ultrasoniques.
  • Détection du niveau par mesure de la résistance au passage d'un courant électrique.
The control devices generally used are the following:
  • Floats which give the high level and the low level of the effluent.
  • Level detection by ultrasonic devices.
  • Level detection by measuring the resistance to the passage of an electric current.

Tous ces dispositifs nécessitent une infrastructure et une installation particulière afin de permettre un entretien simple des capteurs.All these devices require infrastructure and installation to allow simple maintenance of the sensors.

Au JP 04 183991A, on décrit un groupe électropompe ayant trois détecteurs de niveau montés sur le réceptacle, deux d'entre eux déclenchant chacun une minuterie. La pompe s'arrête à l'expiration du laps de temps qui expire le premier. Il reste souvent beaucoup d'effluent dans le réceptacle. Ce document japonais prévoit d'utiliser une pompe qui ne se désamorce pas et vise à empêcher que, lorsque la pompe tourne à vide, le résidu liquide dans le réceptacle ne soit trop agité et chauffé et produise de l'écume qui nuit au bon fonctionnement ultérieur de la pompe. Pour empêcher que la pompe ne tourne à vide, on prévoit au US 4 311438A de mesurer la durée de fonctionnement du moteur de la pompe à partir de sa dernière mise en route et de commander la durée d'arrêt commençant à la fin de cette durée de fonctionnement en fonction de la durée de fonctionnement précédente en augmentant la durée d'arrêt, lorsque les durées de fonctionnement diminuent. Il arrive souvent que le réceptacle ne soit aussi pas bien vidé.JP 04 183991A describes an electric pump group having three level detectors mounted on the receptacle, two of them triggering each a timer. The pump stops at the end of the time period which expires first. Often there is a lot of effluent in the receptacle. This Japanese document plans to use a pump that does not prime and aims to prevent the liquid residue in the pump when the pump is running empty receptacle is too agitated and heated and produces foam which harms the good subsequent operation of the pump. To prevent the pump from running unladen, US 4 311438A provides for measuring the operating time of the pump motor from its last start-up and control the stop time starting at the end of this operating time in function of the previous operating time by increasing the duration when the operating times decrease. It often happens that the receptacle is also not well emptied.

L'invention pallie ces inconvénients par un groupe électropompe submersible qui permet d'obtenir un résidu d'effluent dans le réceptacle aussi petit que possible, tout en utilisant des capteurs statiques ne nécessitant pas d'entretien.The invention overcomes these drawbacks with an electric pump group submersible which allows to obtain an effluent residue in the receptacle also as small as possible, while using static sensors not requiring maintenance.

L'invention a donc pour objet un groupe électropompe submersible destiné au relevage d'effluent contenu dans un réceptacle, comprenant une pompe entraínée par un moteur électrique commandé par un circuit de commande. Suivant l'invention, un premier détecteur du niveau de l'effluent dans le réceptacle est, de préférence, monté sur la pompe à un premier niveau et envoie au circuit de commande un premier signal de changement d'état dès que l'effluent atteint le premier niveau. Un deuxième détecteur de niveau de l'effluent dans le réceptacle est, de préférence, monté sur la pompe à un deuxième niveau inférieur au premier et envoie au circuit de commande un deuxième signal de changement d'état dès que l'effluent a un niveau inférieur au deuxième niveau. Le circuit de commande comporte des moyens destinés à déterminer le laps de temps qui s'écoule entre l'envoi du premier signal et du deuxième signal et destinés à calculer, à partir de ce laps de temps, la durée qui reste à courir à partir de l'envoi du deuxième signal pour arrêter le moteur.The subject of the invention is therefore a submersible electric pump group. intended for lifting effluent contained in a receptacle, comprising a pump driven by an electric motor controlled by a circuit ordered. According to the invention, a first effluent level detector in the receptacle is preferably mounted on the pump first level and sends a first change signal to the control circuit as soon as the effluent reaches the first level. A second detector level of the effluent in the receptacle is preferably mounted on the pump at a second level lower than the first and sends to the control circuit a second state change signal as soon as the effluent has reached a level lower than the second level. The control circuit includes means to determine the period of time between the dispatch of the first signal and the second signal and intended to calculate, from this lapse of time, the time remaining from the sending of the second signal for stop the engine.

En déterminant la durée qui reste à courir pour arrêter le moteur à partir du laps de temps que l'effluent a mis pour passer du premier niveau au deuxième niveau, on peut obtenir une très grande précision sur l'instant auquel il convient d'arrêter le moteur et donc sur la quantité minimum d'effluent qui doit rester dans le réceptacle avant que la pompe ne se désamorce, puisque le niveau auquel la pompe est arrêtée et qui doit être juste supérieur au niveau auquel la pompe se désamorce est calculé à partir des données réelles existantes, y compris la nature et la composition de l'effluent, l'état d'usure de la pompe et l'entartrage de la cuve et des tuyauteries. Le réglage du temps de fonctionnement du moteur de la pompe s'effectue pendant le cycle même où il doit s'appliquer et non d'un cycle à l'autre.By determining the time remaining to stop the engine at from the time it took for the effluent to go from the first level to second level, we can obtain a very high precision on the moment at which the engine should be stopped and therefore the minimum quantity of effluent which must remain in the receptacle before the pump is primed, since the level at which the pump is stopped and which must be just above the level at which the pump is primed is calculated from actual data existing, including the nature and composition of the effluent, the state of wear of the pump and the scaling of the tank and piping. The time setting the pump motor operates during the same cycle where it must apply and not from one cycle to another.

Pour empêcher la pompe de se désamorcer dans le cas où le calcul effectué précédemment est faussé, par exemple si un solide de grand volume est tombé dans la cuve, il est prévu un capteur de désamorçage de la pompe destiné à envoyer au circuit de commande, dès que le désamorçage de la pompe commence, un signal de désamorçage prioritaire.To prevent the pump from priming in case the calculation previously performed is distorted, for example if a large volume solid fell into the tank, a pump priming sensor is provided intended to send to the control circuit, as soon as the defusing of the pump starts, priority override signal.

Aux dessins annexés, donnés à titre d'exemple :

  • la figure 1 est une vue schématique d'un groupe électropompe suivant l'invention, et
  • la figure 2 est un schéma de son circuit de commande, étant entendu que ce schéma électronique peut être remplacé par un micro-contrôleur.
    • In the accompanying drawings, given by way of example:
  • FIG. 1 is a schematic view of an electric pump group according to the invention, and
  • Figure 2 is a diagram of its control circuit, it being understood that this electronic diagram can be replaced by a microcontroller.

    • Le groupe électropompe submersible destiné au relevage d'effluent contenu dans la cuve C comporte une pompe 1 entraínée par un moteur 2 électrique commandé par un circuit 3 de commande. La pompe comporte une ouverture 4 d'aspiration tournée vers le bas et une tubulure 5 de refoulement débouchant à l'extérieur de la cuve C.The submersible pump unit for lifting effluent contained in the tank C comprises a pump 1 driven by a motor 2 electric controlled by a control circuit 3. The pump has a suction opening 4 facing downwards and discharge pipe 5 opening out of tank C.

    Un capteur de niveau 6 est monté à un niveau NH supérieur sur l'enveloppe de l'électropompe. Un deuxième capteur 8 de niveau est monté à un niveau NM intermédiaire sur l'enveloppe 7. Les deux capteurs sont reliés par des conducteurs au circuit 3 de commande, qui affecte la forme d'une carte à circuits imprimés.A level sensor 6 is mounted at a higher NH level on the casing of the electric pump. A second level sensor 8 is mounted at an intermediate NM level on the casing 7. The two sensors are connected by conductors to control circuit 3, which takes the form of a printed circuit board.

    Le circuit de commande représenté à la figure 2 comporte un conducteur 9 connectant le capteur 6 à une porte ET 10 ainsi qu'un conducteur 28 connectant le capteur 8 à la porte ET 10. La porte ET 10 est reliée par un conducteur 11 à un compteur de temps 12, qui mesure le temps qui s'écoule entre le passage de l'effluent du niveau NH au niveau NM et qui calcule, à partir de cette durée, la durée qui reste à s'écouler pour que le niveau de l'effluent dans la cuve C atteigne un niveau NB (figure 1) juste supérieure au niveau où la pompe se désamorce.The control circuit shown in Figure 2 includes a conductor 9 connecting the sensor 6 to an AND gate 10 as well as a conductor 28 connecting the sensor 8 to the AND gate 10. The AND gate 10 is connected by a conductor 11 to a time counter 12, which measures the time which flows between the passage of the effluent from the NH level to the NM level and which calculates, from this duration, the duration that remains to elapse so that the level of effluent in tank C reaches a level NB (figure 1) higher than the level at which the pump is primed.

    Le compteur 12 est relié par un conducteur 13 à une porte OU 14. Il est relié par un conducteur 15 à une horloge 16, laquelle est reliée par un conducteur 17 à la porte OU 14. La sortie de la porte OU 14 est reliée par un conducteur 18 à une porte ET 19. Un capteur de désamorçage 20, qui peut être, de préférence, un capteur d'intensité du moteur ou de cosinus ϕ du moteur 2 est relié par un conducteur 21 à la porte ET 19. La sortie de la porte ET 19 est reliée par un conducteur 22 à un relais 23 de puissance qui alimente, par un conducteur 24, le moteur 2. The counter 12 is connected by a conductor 13 to an OR gate 14. It is connected by a conductor 15 to a clock 16, which is connected by a conductor 17 at OR gate 14. The output of OR gate 14 is connected by a conductor 18 to an AND gate 19. A defuse sensor 20, which can preferably be a motor intensity or cosine capteur sensor of the motor 2 is connected by a conductor 21 to the AND gate 19. The door output AND 19 is connected by a conductor 22 to a power relay 23 which supplies the motor 2 by a conductor 24.

    Le capteur 8 est relié par un conducteur 25 à une porte NON-ET 26 dont la sortie est reliée par un conducteur 27 à l'horloge 16.The sensor 8 is connected by a conductor 25 to a NAND gate 26 the output of which is connected by a conductor 27 to the clock 16.

    Le groupe électropompe submersible suivant l'invention fonctionne de la manière suivante.The submersible electric pump group according to the invention operates from the following way.

    Lorsque l'effluent dans la cuve C atteint le niveau NH, le capteur 6 envoie par le conducteur 9, la porte 10, le conducteur 11, le compteur 12, le conducteur 13, la porte 14, le conducteur 18, la porte 19 et le conducteur 22, un signal de changement d'état au relais 23 de puissance, lequel met en route, par le conducteur 24, le moteur 2. La pompe 1 fonctionne et refoule l'effluent par la tubulure de refoulement 5. Le niveau dans la cuve C diminue. Lorsque ce niveau atteint le niveau NM, le capteur 8 le détecte. Il envoie, par la porte 10 et par le conducteur 11, un signal de changement d'état au compteur 12, lequel calcule le temps qui s'est écoulé depuis le début de la mise en route de la pompe 2. Le compteur 12 calcule le temps qui reste à s'écouler pour que, dans les conditions dans lesquelles s'effectuent le relevage, le niveau dans la cuve C atteigne le niveau NB et transmet cette information par le conducteur 15 à l'horloge 16. Le capteur 8 envoie en même temps, par le conducteur 25, l'information à la porte NON-ET 26 et, par le conducteur 27, à l'horloge 16. L'horloge 16 détermine ainsi la durée restante pendant laquelle la pompe 1 doit fonctionner et envoie un signal correspondant par le conducteur 17, la porte 14, le conducteur 18, la porte 19 et les conducteurs 22 au relais 23 de puissance. Celui-ci cesse d'alimenter le moteur 2 de la pompe 1, dès que cette durée est écoulée.When the effluent in tank C reaches the NH level, the sensor 6 sends by driver 9, door 10, driver 11, counter 12, conductor 13, door 14, conductor 18, door 19 and conductor 22, a change of state signal to the power relay 23, which sets in motion, by driver 24, motor 2. Pump 1 operates and discharges the effluent through the discharge pipe 5. The level in the tank C decreases. When this level reaches the level NM, the sensor 8 detects it. He sends, by the door 10 and by the conductor 11, a state change signal at the counter 12, which calculates the time that has elapsed since the start of the the pump 2. The counter 12 calculates the time which remains to elapse so that, under the conditions in which the lifting is carried out, the level in the tank C reaches NB level and transmits this information by the driver 15 to the clock 16. The sensor 8 sends at the same time, via the conductor 25, information at the NAND gate 26 and, by the driver 27, at the clock 16. The clock 16 thus determines the remaining time during which the pump 1 must operate and sends a corresponding signal by the conductor 17, the gate 14, conductor 18, gate 19 and conductors 22 to relay 23 of power. This ceases to supply the motor 2 of the pump 1, as soon as this duration has elapsed.

    Si le capteur 20 détecte un désamorçage, il envoie, par le conducteur 21, la porte 19 et le conducteur 22, un ordre prioritaire sur tous les autres, qui met hors circuit le relais 23.If the sensor 20 detects a defusing, it sends, by the conductor 21, door 19 and driver 22, a priority order over all the others, which switches relay 23 off.

    Claims (3)

    Groupe électropompe submersible destiné au relevage d'effluent contenu dans un réceptacle (C), comprenant une pompe (1) entraínée par un moteur (2) électrique commandé par un circuit (3) de commande, comprenant un premier détecteur (6) du niveau de l'effluent dans le réceptacle (C) destiné à envoyer au circuit (3) de commande un premier signal de changement d'état, dès que l'effluent atteint un premier niveau (NH), un deuxième détecteur (8) du niveau de l'effluent dans le réceptacle (C) destiné à envoyer au circuit (3) de commande un deuxième signal de changement d'état, dès que l'effluent a un niveau inférieur à un deuxième niveau (NM) inférieur au premier (NH), caractérisé en ce que le circuit (3) de commande comporte des moyens (12) destinés à déterminer le laps de temps qui s'écoule entre l'envoi du premier signal et du deuxième signal et destinés à calculer, à partir de ce laps de temps, la durée qui reste à courir à partir de l'envoi du deuxième signal pour arrêter le moteur (2). Submersible electric pump unit for lifting effluent contained in a receptacle (C), comprising a pump (1) driven by an electric motor (2) controlled by a control circuit (3), comprising a first detector (6) of the level of the effluent in the receptacle (C) intended to send to the control circuit (3) a first state change signal, as soon as the effluent reaches a first level (NH), a second detector (8) of the level of the effluent in the receptacle (C) intended to send to the control circuit (3) a second signal for change of state, as soon as the effluent has a level lower than a second level (NM) lower than the first (NH), characterized in that the control circuit (3) comprises means (12) intended to determine the lapse of time which elapses between the sending of the first signal and the second signal and intended to calculate, from this lapse of time, the duration which remains to run from the sending of the second signal to stop the engine (2). Groupe suivant la revendication 1, caractérisé par un capteur (20) de désamorçage de la pompe (1), destiné à envoyer au circuit (3) de commande, dès que le désamorçage de la pompe (1) commence, un signal de désamorçage prioritaire.Group according to claim 1, characterized by a sensor (20) pump priming (1), intended to send to the circuit (3) of control, as soon as the pump (1) is primed, a signal priority defusing. Groupe suivant la revendication 1 ou 2, caractérisé en ce que les deux détecteurs (6 et 8) sont montés sur la pompe (1).Group according to claim 1 or 2, characterized in that the two detectors (6 and 8) are mounted on the pump (1).
    EP98402134A 1997-09-17 1998-08-28 Submersible effluent pump Expired - Lifetime EP0903497B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9711567A FR2768468A1 (en) 1997-09-17 1997-09-17 SUBMERSIBLE ELECTRIC PUMP UNIT FOR EFFLUENT LIFTING LEAVING AS LITTLE RESIDUE AS POSSIBLE
    FR9711567 1997-09-17

    Publications (2)

    Publication Number Publication Date
    EP0903497A1 true EP0903497A1 (en) 1999-03-24
    EP0903497B1 EP0903497B1 (en) 2003-03-26

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    Application Number Title Priority Date Filing Date
    EP98402134A Expired - Lifetime EP0903497B1 (en) 1997-09-17 1998-08-28 Submersible effluent pump

    Country Status (7)

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    EP (1) EP0903497B1 (en)
    AT (1) ATE235656T1 (en)
    DE (1) DE69812515T2 (en)
    DK (1) DK0903497T3 (en)
    ES (1) ES2190573T3 (en)
    FR (1) FR2768468A1 (en)
    PT (1) PT903497E (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2817923A1 (en) * 2000-12-12 2002-06-14 Pompes Salmson Sa Method of controlling flood water lifting pump involves timing water flow between higher and lower levels to determine pumping time

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    Publication number Priority date Publication date Assignee Title
    US4311438A (en) * 1978-11-20 1982-01-19 El-Fi Innovationer Ab Method and apparatus for controlling the start of an intermittently operating pump
    JPS5810187A (en) * 1981-07-10 1983-01-20 Ebara Corp Apparatus for judging capacity of feed water pump
    JPH04183991A (en) * 1990-11-15 1992-06-30 Ebara Corp Operation stop method for bilge sewage pump
    JPH07305693A (en) * 1994-05-12 1995-11-21 Hitachi Ltd Controller for submergible pump

    Patent Citations (4)

    * Cited by examiner, † Cited by third party
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    DK0903497T3 (en) 2003-07-14
    EP0903497B1 (en) 2003-03-26
    PT903497E (en) 2003-07-31
    DE69812515D1 (en) 2003-04-30
    ES2190573T3 (en) 2003-08-01
    FR2768468A1 (en) 1999-03-19
    ATE235656T1 (en) 2003-04-15
    DE69812515T2 (en) 2003-11-06

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