EP0903498B1 - Submersible pump and method of control thereof - Google Patents

Submersible pump and method of control thereof Download PDF

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Publication number
EP0903498B1
EP0903498B1 EP98402135A EP98402135A EP0903498B1 EP 0903498 B1 EP0903498 B1 EP 0903498B1 EP 98402135 A EP98402135 A EP 98402135A EP 98402135 A EP98402135 A EP 98402135A EP 0903498 B1 EP0903498 B1 EP 0903498B1
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EP
European Patent Office
Prior art keywords
pump
effluent
level
sensor
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.)
Expired - Lifetime
Application number
EP98402135A
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German (de)
French (fr)
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EP0903498A1 (en
Inventor
Louis Symoens
Jacques Berthon
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KSB SAS
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KSB SAS
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Publication of EP0903498A1 publication Critical patent/EP0903498A1/en
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Publication of EP0903498B1 publication Critical patent/EP0903498B1/en
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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
    • 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

  • a submersible electric pump group which includes a pump driven by an electric motor controlled by a circuit ordered. Motor is energized as soon as a high level sensor detects the presence of the effluent.
  • the invention relates to a submersible electric pump group of the type mentioned above, in which one can dispense with having a sensor in low level to prevent defusing the pump, while having a very small amount of residual effluent in the receptacle.
  • An electric pump unit according to the invention is defined in claim 1 and improved in claim 2.
  • the submersible electric pump group according to the invention is capable of to recognize the volume it must repress before stopping so as not to be defused.
  • the group When the group is to be put for the first time in a receptacle, we operate it, which determines the level of defusing in the receptacle.
  • the means of determination of a subsequent period of operation determine a new period, called subsequent duration of operation shorter than the initial duration, in so that, on the one hand, we are sure that there will be no more defusing, and that, on the other hand, we can make this later duration very close of the initial duration, so that the residual quantity of effluent remaining in the receptacle can be lowered to a very small value.
  • FIG. 1 represents a submersible electric pump group according to the invention which comprises a pump 1 having a suction opening 2 and a discharge pipe 3 outside a tank C, in which the group is intended to be placed to raise the effluent it contains.
  • the pump 1 is driven by an electric motor 4 controlled by a circuit 5 control in the form of a printed circuit board.
  • a sensor 6 of level which detects a high NH level in tank C, from which the group starts up and pushes back the effluent contained in tank C by the tubing 3.
  • FIG. 1 also shows a low NB level, at which wants the control circuit 5 to stop pump 1 and an ND level of defusing, symbolically represented in Figure 1 by the reference 7 but which in fact can be obtained by a sensor of a variation of the cosine ⁇ or of the intensity of motor 4 when the pump is about to prime.
  • the control circuit shown in Figure 2 comprises from the sensor 6 a conductor 8 leading to an entrance to a door 9 AND.
  • the second input of the AND gate is connected to the sensor 7 by a conductor 10.
  • the output of door 9 is connected by a conductor 11 to a junction point 12.
  • a conductor 13 leads to an entrance of a carries 14 OR, while another conductor 15 leads to a clock 16, which is connected by a conductor 17 to means 18 for determining of a later operating time shorter than the measured time by the clock 16.
  • Said means are connected by a conductor 19 to the input a door 20 AND the other input of which is connected by a conductor 21 and by via a junction point 22 to the sensor 6.
  • the junction point 22 is connected by a conductor 23 to an input of the means 18.
  • the output of the door 20 AND is connected by a conductor 24 to an input of door 14 OR the output of which is connected by a conductor 25 to a door 26 AND.
  • the other entry of door 26 AND is connected by a
  • the output of door 26 AND is connected by a conductor 28 to a relay 29 of power which controls by a driver 30 the motor 4 of the pump 1.
  • sensor 6 When we put the pump group 1, 4 for the first time in a tank C and when the level of effluent in the tank reaches the NH level, sensor 6 detects this level. It sends by driver 8, the door 9 AND, driver 11, point 12, driver 13, door 14 OR, conductor 25, AND gate, AND gate 26, conductor 28, relay 29 and conductor 30, a change of state signal which causes motor 4 to be switched on energized and drives the pump 1. Effluent is discharged outside the tank C via the delivery pipe 3. The level of effluent in tank C drops below the NH level.
  • the sensor 7 sends a signal from the conductor 10 change of state which arrives by the door 9 AND, by the driver 11, by the point 12 and by the driver 15 to the clock 16 which stops counting the operating time.
  • This duration is transmitted by the driver 17 to means 18 which determine a later operating time less longer than the original duration.
  • the signal corresponding to this subsequent duration is transmitted by conductor 19 to gate 20 AND and by conductor 24 to gate 14 OR, then through conductor 25 and through AND gate and conductor 28 to the power relay 29, which by the driver 30 operates the motor 4 and therefore the pump 1 during the subsequent operating time, this time being calculated from the moment the effluent contained in the tank reaches again the NH level as noted by sensor 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Secondary Cells (AREA)
  • Inert Electrodes (AREA)
  • Cell Separators (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The pump includes a timing circuit controlling operation of pump to ensure priming of pump and sufficient operating time to ensure full pumping action. The system includes a pump (1) driven by an electric motor (4) controlled by a control circuit (5) with a liquid level sensor. The sensor (6) determines the level of effluent in the container (C) within which the pump and motor are immersed. The control circuit includes a clock which measures the time needed until the pump is fully primed, and controls the time of subsequent pump operation accordingly.

Description

Pour relever des effluents contenus dans un réceptacle, notamment une cuve, on utilise un groupe électropompe submersible qui comprend une pompe entraínée par un moteur électrique commandé par un circuit de commande. Le moteur est mis sous tension dès qu'un capteur de niveau haut détecte la présence de l'effluent.To detect effluents contained in a receptacle, in particular a tank, we use a submersible electric pump group which includes a pump driven by an electric motor controlled by a circuit ordered. Motor is energized as soon as a high level sensor detects the presence of the effluent.

Au Patent Abstracts of Japan vol. 011, no. 111 (578), 8 avril 1987, on vise à réduire la fréquence de mise en route d'une pompe en contrôlant la durée qui s'écoule entre son arrêt et sa remise en route.In Patent Abstracts of Japan vol. 011, no. 111 (578), April 8, 1987, on aims to reduce the frequency of pump start-up by controlling the time elapsed between stopping and restarting.

Pour empêcher que la pompe ne se désamorce, il faut, à moins d'utiliser une pompe qui ne se désamorce pas comme au JP 04 183991 A, utiliser aussi un capteur de niveau bas, qui détecte le niveau de l'effluent dans le réceptacle lorsque ce niveau est proche du niveau de désamorçage et qui envoie un signal au circuit de commande pour arrêter la pompe.To prevent the pump from priming, you must, unless use a pump that does not prime as in JP 04 183991 A, also use a low level sensor, which detects the level of effluent in the receptacle when this level is close to the defusing level and which sends a signal to the control circuit to stop the pump.

L'invention vise un groupe électropompe submersible du type mentionné ci-dessus, dans lequel on peut se dispenser d'avoir un capteur en niveau bas pour prévenir le désamorçage de la pompe, tout en ayant une très faible quantité d'effluent résiduel dans le réceptacle. Un groupe electropompe suivant l'invention est défini à la revendication 1 et perfectionné à la revendication 2.The invention relates to a submersible electric pump group of the type mentioned above, in which one can dispense with having a sensor in low level to prevent defusing the pump, while having a very small amount of residual effluent in the receptacle. An electric pump unit according to the invention is defined in claim 1 and improved in claim 2.

Un procédé pour faire fonctionner un groupe électropompe submersible de ce type est donné à la revendication 3. A method for operating a submersible electric pump group of this type is given in claim 3.

Le groupe électropompe submersible suivant l'invention est à même de reconnaítre le volume qu'il doit refouler avant de s'arrêter pour ne pas être désamorcé. Lorsque le groupe doit être mis pour la première fois dans un réceptacle, on le fait fonctionner, ce qui détermine le niveau de désamorçage dans le réceptacle. Sur la base de cette donnée, les moyens de détermination d'une durée ultérieure de fonctionnement déterminent une nouvelle durée, dite durée ultérieure, de fonctionnement moins longue que la durée initiale, en sorte que, d'une part, on est sûr qu'il n'y aura plus de désamorçage, et que, d'autre part, on peut faire en sorte que cette durée ultérieure soit très proche de la durée initiale, si bien que la quantité résiduelle d'effluent restant dans le réceptacle peut être abaissée à une valeur très petite.The submersible electric pump group according to the invention is capable of to recognize the volume it must repress before stopping so as not to be defused. When the group is to be put for the first time in a receptacle, we operate it, which determines the level of defusing in the receptacle. On the basis of this data, the means of determination of a subsequent period of operation determine a new period, called subsequent duration of operation shorter than the initial duration, in so that, on the one hand, we are sure that there will be no more defusing, and that, on the other hand, we can make this later duration very close of the initial duration, so that the residual quantity of effluent remaining in the receptacle can be lowered to a very small value.

Aux dessins annexés, donnés uniquement à titre d'exemple :

  • la figure 1 est une vue schématique d'un groupe électropompe submersible suivant l'invention, tandis que
  • la figure 2 est une vue synoptique du circuit de commande du groupe qui pourrait être remplacé par un microcontrôleur.
    • In the accompanying drawings, given solely by way of example:
  • FIG. 1 is a schematic view of a submersible electric pump group according to the invention, while
  • Figure 2 is a block diagram of the group control circuit which could be replaced by a microcontroller.

    • La figure 1 représente un groupe électropompe submersible suivant l'invention, qui comprend une pompe 1 ayant une ouverture 2 d'aspiration et une tubulure 3 de refoulement à l'extérieur d'une cuve C, dans laquelle le groupe est destiné à être placé pour relever l'effluent qu'elle contient. La pompe 1 est entraínée par un moteur 4 électrique commandé par un circuit 5 de commande sous la forme d'une plaquette à circuits imprimés.FIG. 1 represents a submersible electric pump group according to the invention which comprises a pump 1 having a suction opening 2 and a discharge pipe 3 outside a tank C, in which the group is intended to be placed to raise the effluent it contains. The pump 1 is driven by an electric motor 4 controlled by a circuit 5 control in the form of a printed circuit board.

    Sur l'enveloppe du groupe électropompe est prévue un capteur 6 de niveau qui détecte un niveau NH haut dans la cuve C, à partir duquel le groupe se met en route et refoule l'effluent contenu dans la cuve C par la tubulure 3.On the casing of the electric pump group is provided a sensor 6 of level which detects a high NH level in tank C, from which the group starts up and pushes back the effluent contained in tank C by the tubing 3.

    On a représenté également à la figure 1 un niveau NB bas, auquel on souhaite que le circuit 5 de commande arrête la pompe 1 et un niveau ND de désamorçage, représenté symboliquement à la figure 1 par la référence 7 mais qui en fait peut être obtenu par un capteur d'une variation du cosinus ϕ ou de l'intensité du moteur 4 lorsque la pompe est sur le point de se désamorcer. FIG. 1 also shows a low NB level, at which wants the control circuit 5 to stop pump 1 and an ND level of defusing, symbolically represented in Figure 1 by the reference 7 but which in fact can be obtained by a sensor of a variation of the cosine ϕ or of the intensity of motor 4 when the pump is about to prime.

    Le circuit de commande représenté à la figure 2 comprend à partir du capteur 6 un conducteur 8 menant à une entrée d'une porte 9 ET. La deuxième entrée de la porte ET est reliée au capteur 7 par un conducteur 10. La sortie de la porte 9 est reliée par un conducteur 11 à un point de jonction 12. Du point de jonction 12 part un conducteur 13 menant à une entrée d'une porte 14 OU, tandis qu'un autre conducteur 15 mène à une horloge 16, laquelle est reliée par un conducteur 17 à des moyens 18 de détermination d'une durée ultérieure de fonctionnement moins longue que la durée mesurée par l'horloge 16. Lesdits moyens sont reliés par un conducteur 19 à l'entrée d'une porte 20 ET dont l'autre entrée est reliée par un conducteur 21 et par l'intermédiaire d'un point de jonction 22 au capteur 6. Le point de jonction 22 est relié par un conducteur 23 à une entrée des moyens 18. La sortie de la porte 20 ET est reliée par un conducteur 24 à une entrée de la porte 14 OU dont la sortie est reliée par un conducteur 25 à une porte 26 ET. L'autre entrée de la porte 26 ET est reliée par un conducteur 27 au capteur 7.The control circuit shown in Figure 2 comprises from the sensor 6 a conductor 8 leading to an entrance to a door 9 AND. The second input of the AND gate is connected to the sensor 7 by a conductor 10. The output of door 9 is connected by a conductor 11 to a junction point 12. From the junction point 12 a conductor 13 leads to an entrance of a carries 14 OR, while another conductor 15 leads to a clock 16, which is connected by a conductor 17 to means 18 for determining of a later operating time shorter than the measured time by the clock 16. Said means are connected by a conductor 19 to the input a door 20 AND the other input of which is connected by a conductor 21 and by via a junction point 22 to the sensor 6. The junction point 22 is connected by a conductor 23 to an input of the means 18. The output of the door 20 AND is connected by a conductor 24 to an input of door 14 OR the output of which is connected by a conductor 25 to a door 26 AND. The other entry of door 26 AND is connected by a conductor 27 to sensor 7.

    La sortie de la porte 26 ET est reliée par un conducteur 28 à un relais 29 de puissance qui commande par un conducteur 30 le moteur 4 de la pompe 1.The output of door 26 AND is connected by a conductor 28 to a relay 29 of power which controls by a driver 30 the motor 4 of the pump 1.

    Lorsque l'on met le groupe électropompe 1, 4 pour la première fois dans une cuve C et lorsque le niveau de l'effluent dans la cuve atteint le niveau NH, le capteur 6 détecte ce niveau. Il envoie par le conducteur 8, la porte 9 ET, le conducteur 11, le point 12, le conducteur 13, la porte 14 OU, le conducteur 25, la porte ET, la porte 26 ET, le conducteur 28, le relais 29 et le conducteur 30, un signal de changement d'état qui fait que le moteur 4 est mis sous tension et entraíne la pompe 1. De l'effluent est refoulé à l'extérieur de la cuve C par la tubulure 3 de refoulement. Le niveau de l'effluent dans la cuve C s'abaisse au-dessous du niveau NH. Lorsque ce niveau atteint le niveau ND de désamorçage, le capteur 7 envoie par le conducteur 10 un signal de changement d'état qui arrive par la porte 9 ET, par le conducteur 11, par le point 12 et par le conducteur 15 à l'horloge 16 qui cesse de décompter la durée de fonctionnement. Cette durée est transmise par le conducteur 17 aux moyens 18 qui déterminent une durée ultérieure de fonctionnement moins longue que la durée initiale. Le signal correspondant à cette durée ultérieure est transmis par le conducteur 19 à la porte 20 ET et par le conducteur 24 à la porte 14 OU, puis par le conducteur 25 et par la porte ET et le conducteur 28 au relais 29 de puissance, qui par le conducteur 30 fait fonctionner le moteur 4 et donc la pompe 1 pendant la durée ultérieure de fonctionnement, cette durée étant calculée à partir du moment où l'effluent contenu dans la cuve atteint à nouveau le niveau NH comme le relève le capteur 6.When we put the pump group 1, 4 for the first time in a tank C and when the level of effluent in the tank reaches the NH level, sensor 6 detects this level. It sends by driver 8, the door 9 AND, driver 11, point 12, driver 13, door 14 OR, conductor 25, AND gate, AND gate 26, conductor 28, relay 29 and conductor 30, a change of state signal which causes motor 4 to be switched on energized and drives the pump 1. Effluent is discharged outside the tank C via the delivery pipe 3. The level of effluent in tank C drops below the NH level. When this level reaches the ND level sensor 7, the sensor 7 sends a signal from the conductor 10 change of state which arrives by the door 9 AND, by the driver 11, by the point 12 and by the driver 15 to the clock 16 which stops counting the operating time. This duration is transmitted by the driver 17 to means 18 which determine a later operating time less longer than the original duration. The signal corresponding to this subsequent duration is transmitted by conductor 19 to gate 20 AND and by conductor 24 to gate 14 OR, then through conductor 25 and through AND gate and conductor 28 to the power relay 29, which by the driver 30 operates the motor 4 and therefore the pump 1 during the subsequent operating time, this time being calculated from the moment the effluent contained in the tank reaches again the NH level as noted by sensor 6.

    On est sûr ainsi que la pompe ne fonctionnera, lors de son deuxième fonctionnement, que pendant une durée inférieure à celle qui aurait provoquée son désamorçage dans les conditions dans lesquelles elle est installée.We are sure that the pump will not work during its second operation, only for a period shorter than that which would have caused its defusing under the conditions in which it is installed.

    Claims (3)

    1. Submersible electropump plant intended for raising effluent contained in a receptacle (C), comprising a pump (1) driven by an electric motor (4) controlled by a control circuit (5), characterized in that a first sensor (6) of a given level (NH) of the effluent in the receptacle (C) sends a first signal of change of state to the control circuit (5) as soon as the effluent reaches this given level (NH), a second sensor (7) sends a second signal of change of state to the control circuit as soon as the effluent reaches an unpriming level (ND), the control circuit comprises a clock (16) which is activated by the first and second signal, and which measures an initial duration of operation of the pump (1) until its unpriming which is determined by the unpriming level (ND) such that the clock (16) ceases to count down the initial duration of operation when the second sensor (7) detects that the level of the effluent in the receptacle (6) reaches the unpriming level (ND), and the plant comprises means (18) for determining a subsequent duration of operation, commencing at the instant at which the effluent again reaches the given level (NH), not as long as the initial duration, and means intended to impose this subsequent duration during the subsequent operation of the pump.
    2. Plant according to Claim 1, characterized in that the sensor (6) is mounted on the pump (1).
    3. Method of operating a submersible electropump plant intended for raising effluent contained in a receptacle (C) comprising a pump (1) driven by an electric motor (4) controlled by a control circuit (5), characterized in that it consists in determining the initial duration of operation of the pump (1) between a given level of the effluent in the receptacle and an unpriming level and in adopting, as subsequent duration of operation of the pump (1) commencing at the instant at which the effluent again reaches the given level (NH), a duration less than the initial duration.
    EP98402135A 1997-09-17 1998-08-28 Submersible pump and method of control thereof Expired - Lifetime EP0903498B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9711566A FR2768467B1 (en) 1997-09-17 1997-09-17 SUBMERSIBLE ELECTRIC PUMP GROUP RECOGNIZING ITS OPERATING VOLUME AND METHOD FOR OPERATING THIS SUBMERSIBLE ELECTRIC PUMP GROUP
    FR9711566 1997-09-17

    Publications (2)

    Publication Number Publication Date
    EP0903498A1 EP0903498A1 (en) 1999-03-24
    EP0903498B1 true EP0903498B1 (en) 2003-06-04

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98402135A Expired - Lifetime EP0903498B1 (en) 1997-09-17 1998-08-28 Submersible pump and method of control thereof

    Country Status (7)

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    EP (1) EP0903498B1 (en)
    AT (1) ATE242428T1 (en)
    DE (1) DE69815238T2 (en)
    DK (1) DK0903498T3 (en)
    ES (1) ES2195289T3 (en)
    FR (1) FR2768467B1 (en)
    PT (1) PT903498E (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US11162496B2 (en) 2016-11-11 2021-11-02 Wayne/Scott Fetzer Company Pump with external electrical components and related methods

    Family Cites Families (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    SE420788B (en) * 1978-11-20 1981-10-26 Elfi Innovationer SET AND DEVICE TO CONTROL THE STARTING OF AN INTERMITTENT WORKING PUMP
    JPH0674794B2 (en) * 1985-05-09 1994-09-21 株式会社日立製作所 Water pump operation controller
    JPH0278776A (en) * 1988-09-16 1990-03-19 Touka Seiki:Kk Liquid level detecting type automatic pumping device
    JPH07103865B2 (en) * 1990-11-15 1995-11-08 株式会社荏原製作所 How to stop operation of sewage / dirt pump

    Also Published As

    Publication number Publication date
    DE69815238D1 (en) 2003-07-10
    FR2768467A1 (en) 1999-03-19
    DE69815238T2 (en) 2004-04-22
    PT903498E (en) 2003-09-30
    ATE242428T1 (en) 2003-06-15
    EP0903498A1 (en) 1999-03-24
    ES2195289T3 (en) 2003-12-01
    FR2768467B1 (en) 2004-11-12
    DK0903498T3 (en) 2003-09-22

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