EP0390628B1 - Motor pump unit with a temperature control device on the outlet branch - Google Patents

Motor pump unit with a temperature control device on the outlet branch Download PDF

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Publication number
EP0390628B1
EP0390628B1 EP19900400654 EP90400654A EP0390628B1 EP 0390628 B1 EP0390628 B1 EP 0390628B1 EP 19900400654 EP19900400654 EP 19900400654 EP 90400654 A EP90400654 A EP 90400654A EP 0390628 B1 EP0390628 B1 EP 0390628B1
Authority
EP
European Patent Office
Prior art keywords
motor
discharge pipe
pump unit
pump
temperature
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
EP19900400654
Other languages
German (de)
French (fr)
Other versions
EP0390628A1 (en
Inventor
Jacques Berthon
Christian Mabillot
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.)
KSB SAS
Original Assignee
KSB SAS
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Filing date
Publication date
Application filed by KSB SAS filed Critical KSB SAS
Publication of EP0390628A1 publication Critical patent/EP0390628A1/en
Application granted granted Critical
Publication of EP0390628B1 publication Critical patent/EP0390628B1/en
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
    • F04B49/10—Other safety measures

Definitions

  • the present invention relates to pump sets, according to the preamble of claim 1.
  • DE-A-2925830 describes a device for protecting against dry running for pumps, which comprises a probe for measuring the resistance between the pump body and the liquid.
  • the probe enters the liquid circuit.
  • An electrical circuit is used to stop the engine in response to the signal from the probe. This does not detect a temperature, but the resistance of the liquid which passes through the piping, which requires to provide an additional crossing in the piping.
  • JP-58 20 982 having the characteristics of the preamble of claim 1, the sum of the temperature rises of the pump body and motor flange would be detected. It is not proposed to detect the temperature of the discharge piping.
  • the invention overcomes this drawback of dry running by a pump unit as defined in claim 1.
  • the temperature detector stops the pump set.
  • the detection of the temperature of the discharge piping is much more precise than that of an entire pump body and even more of both it and the associated motor, because its calorific capacity is much lower and there is no produces no local overheating due to the mechanical action of the moving parts of the pump.
  • the signal supplied by the temperature detector is then very sensitive, since the latter is subjected on the one hand to a cooling effect due to the heat exchange relationship with the discharge piping through which cold liquid passes and to a heating effect due to its heat exchange relationship with the heat source that is the dissipator.
  • the temperature sensor stops the pump set.
  • the two sources fail and combine their effects.
  • the temperature detector is interposed between the discharge pipe and the heat sink of the control circuit.
  • the heat sink is in heat exchange relation with the discharge pipe, which means that it is mounted directly on the discharge pipe or that it is mounted in the immediate vicinity thereof.
  • the pump set includes a motor 1 driving a pump 2 in rotation on the discharge pipe 3 from which is mounted, in heat exchange relationship because in contact with the discharge pipe 3, the heat sink 4 of the power stage of the speed controller 5 of the motor 1.
  • the speed controller 5 controls the motor 1 by a conductor 6.
  • thermoelectric transducer 9 which by a conductor 10 opens the electrical circuit 5, 6 of the motor 1, when the temperature detected by the detector 7 exceeds a given threshold.

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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)

Description

La présente invention est relative aux groupes motopompes, suivant le préambule de la revendication 1.The present invention relates to pump sets, according to the preamble of claim 1.

Dans un groupe motopompe de ce genre, il peut arriver que la pompe fonctionne sans débiter, par exemple parce que la source d'eau qui l'alimente est tarie. Un fonctionnement de ce genre est très dommageable pour la pompe.In a pump set of this kind, it can happen that the pump operates without delivering, for example because the source of water which supplies it is dried up. Operation like this is very damaging to the pump.

Au DE-A-2925830, on décrit un dispositif de protection contre la marche à sec pour des pompes, qui comprend une sonde de mesure de la résistance entre le corps de pompe et le liquide. La sonde pénètre dans le circuit liquide. Un circuit électrique permet d'arrêter le moteur en réponse au signal fourni par la sonde. Celle-ci ne détecte pas une température, mais la résistance du liquide qui passe dans la tuyauterie, ce qui nécessite de ménager une traversée supplémentaire dans la tuyauterie.DE-A-2925830 describes a device for protecting against dry running for pumps, which comprises a probe for measuring the resistance between the pump body and the liquid. The probe enters the liquid circuit. An electrical circuit is used to stop the engine in response to the signal from the probe. This does not detect a temperature, but the resistance of the liquid which passes through the piping, which requires to provide an additional crossing in the piping.

Au JP-58 20 982, ayant les caractéristiques du préambule de la revendication 1, on détecterait la somme des élévations de température de la bride du corps de pompe et du moteur. On ne propose pas de détecter la température de la tuyauterie de refoulement.In JP-58 20 982, having the characteristics of the preamble of claim 1, the sum of the temperature rises of the pump body and motor flange would be detected. It is not proposed to detect the temperature of the discharge piping.

L'invention pallie cet inconvénient de marche à sec par un groupe motopompe tel que défini à la revendication 1.The invention overcomes this drawback of dry running by a pump unit as defined in claim 1.

Dès que du liquide ne passe plus dans la tuyauterie de refoulement, celle-ci, qui n'est plus refroidie, s'échauffe et le détecteur de la température arrête le groupe motopompe. La détection de la température de la tuyauterie de refoulement est bien plus précise que celle de tout un corps de pompe et plus encore à la fois de celui-ci et du moteur associé, car sa capacité calorifique est bien moindre et il ne s'y produit pas de surchauffe locale due à l'action mécanique des pièces mobiles de la pompe. Le signal fourni par le détecteur de température est alors très sensible, puisque celui-ci est soumis d'une part à un effet de refroidissement dû à la relation d'échange thermique avec la tuyauterie de refoulement dans lequel passe du liquide froid et à un effet de chauffage dû à sa relation d'échange thermique avec la source de chaleur qu'est le dissipateur. Quand l'une des deux de la source de refroidissement et de la source de chaleur est défaillante, c'est-à-dire si le refroidissement est insuffisant ou si le réchauffement est trop important, le détecteur de température arrête le groupe motopompe. Pour une marche à sec de la pompe, les deux sources sont défaillantes et cumulent leurs effets. De préférence, le détecteur de température est interposé entre la tuyauterie de refoulement et le dissipateur de chaleur du circuit de commande.As soon as liquid no longer passes through the discharge piping, the latter, which is no longer cooled, heats up and the temperature detector stops the pump set. The detection of the temperature of the discharge piping is much more precise than that of an entire pump body and even more of both it and the associated motor, because its calorific capacity is much lower and there is no produces no local overheating due to the mechanical action of the moving parts of the pump. The signal supplied by the temperature detector is then very sensitive, since the latter is subjected on the one hand to a cooling effect due to the heat exchange relationship with the discharge piping through which cold liquid passes and to a heating effect due to its heat exchange relationship with the heat source that is the dissipator. When one of the two of the cooling source and the heat source fails, that is to say if the cooling is insufficient or if the heating is too important, the temperature sensor stops the pump set. For a dry running of the pump, the two sources fail and combine their effects. Preferably, the temperature detector is interposed between the discharge pipe and the heat sink of the control circuit.

De préférence, le dissipateur de chaleur est en relation d'échange thermique avec la tuyauterie de refoulement, ce qui signifie qu'il est monté directement sur la tuyauterie de refoulement ou qu'il est monté à proximité immédiate de celle-ci.Preferably, the heat sink is in heat exchange relation with the discharge pipe, which means that it is mounted directly on the discharge pipe or that it is mounted in the immediate vicinity thereof.

La figure unique du dessin annexé est un schéma illustrant l'invention.The single figure of the accompanying drawing is a diagram illustrating the invention.

Le groupe motopompe comprend un moteur 1 entraînant en rotation une pompe 2 sur la tuyauterie de refoulement 3 de laquelle est monté, en relation d'échange thermique parce qu'en contact avec la tuyauterie de refoulement 3, le dissipateur de chaleur 4 de l'étage de puissance du variateur de vitesse 5 du moteur 1. Le variateur de vitesse 5 commande le moteur 1 par un conducteur 6.The pump set includes a motor 1 driving a pump 2 in rotation on the discharge pipe 3 from which is mounted, in heat exchange relationship because in contact with the discharge pipe 3, the heat sink 4 of the power stage of the speed controller 5 of the motor 1. The speed controller 5 controls the motor 1 by a conductor 6.

Entre le dissipateur 4, dans lequel passe le liquide provenant de la tuyauterie 3, et la tuyauterie 3 est interposé un détecteur de température 7 qui, par une ligne 8, envoie un signal de température à un transducteur thermo-électrique 9, lequel par un conducteur 10 ouvre le circuit électrique 5, 6 du moteur 1, quand la température détectée par le détecteur 7 dépasse un seuil donné.Between the dissipator 4, through which the liquid coming from the piping 3 passes, and the piping 3 is interposed a temperature detector 7 which, by a line 8, sends a temperature signal to a thermoelectric transducer 9, which by a conductor 10 opens the electrical circuit 5, 6 of the motor 1, when the temperature detected by the detector 7 exceeds a given threshold.

Claims (3)

  1. Motor pump unit comprising a pump (2) with a discharge pipe (3), an electric motor (1) driving the pump (2), an electrical circuit (5, 6) for controlling the motor and a temperature detector (7) sending a temperature signal to a thermoelectric transducer (9) which opens the electrical circuit (5, 6) controlling the motor (1) when the temperature detected exceeds a given threshold, characterised in that the electrical control circuit comprises a heat dissipator (4) through which the liquid discharged by the pump passes, and in that the temperature detector is mounted so as to detect the temperature in the discharge pipe (3), and the temperature detector (7) is in heat exchange relationship with the discharge pipe (3) and with the heat dissipator (4).
  2. Motor pump unit according to Claim 1, characterised in that the temperature detector (7) is interposed between the discharge pipe (3) and the heat dissipator (4).
  3. Motor pump unit according to one of Claims 1 or 2, characterised in that the heat dissipator (4) is in heat exchange relationship with the discharge pipe (3).
EP19900400654 1989-03-31 1990-03-13 Motor pump unit with a temperature control device on the outlet branch Expired - Lifetime EP0390628B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904244A FR2645212A1 (en) 1989-03-31 1989-03-31 MOTOR PUMP GROUP WITH TEMPERATURE SENSOR ON DISCHARGE PIPING
FR8904244 1989-03-31

Publications (2)

Publication Number Publication Date
EP0390628A1 EP0390628A1 (en) 1990-10-03
EP0390628B1 true EP0390628B1 (en) 1993-07-14

Family

ID=9380252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900400654 Expired - Lifetime EP0390628B1 (en) 1989-03-31 1990-03-13 Motor pump unit with a temperature control device on the outlet branch

Country Status (3)

Country Link
EP (1) EP0390628B1 (en)
DE (1) DE69002179T2 (en)
FR (1) FR2645212A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103857C2 (en) * 1991-02-08 1994-05-05 Willi Hacker Pump control device
DE10054091A1 (en) * 2000-11-01 2002-05-16 Grundfos As Method for determining at least one property of a medium located in the delivery path of a pump unit
CN104653443A (en) * 2015-01-20 2015-05-27 湖南五新重型装备有限公司 Accelerating agent pump protection device and vehicle-mounted type wet spraying machine
CN104712561B (en) * 2015-01-22 2017-05-31 晋州市水泵厂 A kind of immersible pump water shortage automatic protecting control device and application method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH267182A (en) * 1939-03-28 1950-03-15 Airseco Societe A Responsabili Compressed air installation.
DE2925830A1 (en) * 1979-06-27 1981-01-15 Rudolf Steffan Dry-running safety cut=out for pump - uses resistance variation between flow stream and pump housing to disconnect pump motor
JPS57131887A (en) * 1981-02-07 1982-08-14 Hitachi Ltd Electric well pump
JPS5820982A (en) * 1981-07-29 1983-02-07 Hitachi Ltd Pump with motor
JPS59155584A (en) * 1983-02-24 1984-09-04 Atsugi Motor Parts Co Ltd Temperature control device for compressor

Also Published As

Publication number Publication date
EP0390628A1 (en) 1990-10-03
DE69002179D1 (en) 1993-08-19
FR2645212A1 (en) 1990-10-05
DE69002179T2 (en) 1994-02-03

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