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(11) | EP 1 426 621 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
Electric pump operation control device Betriebssteuerungsvorrichtung für eine Elektropumpe Dispositif de commande de fonctionnement d'une pompe |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
Technical field of the invention
[0001] The invention has the object of an electric pump operation control device, of those that are comprised of a multi-stage pump and by an electric motor coupled together coaxially, and which are widely used to lift water.
Background of the invention
[0002] Multiple embodiments are known of electric pumps comprised of a multi-stage pump and by an electric motor coupled together coaxially. To control the operation of electric pumps, devices which control operation variables thereof can be installed; amongst said operation variables we should highlight the control of the electric motor operating conditions, specifically the loaded operating conditions which correspond to the pumping of water by the multi-stage pump and the idle operating conditions which correspond to the non-pumping of water by the multi-stage pump, and the control of the electric pump operating periods, to adapt them to the conditions preset by the requirements of use such as those of automatic watering of garden areas similar devices are also known from US 4 420 787 A and US 5 015 151 A.
[0003] Up to the present date, said operation control devices have to be externally arranged in relation to the electric pump, which, in any case, implies high assembly costs, which make the total cost of the installations more expensive.
Explanation of the invention
[0004] The electric pump operation control device of the invention is applicable to electric pumps comprised of a multi-stage pump and of an electric motor coaxially coupled, the electric motor being equipped with a junction box adapted to connect a single-phase or three-phase AC line to power the electric motor.
[0005] The control device according to the invention comprises an electric motor operating conditions control circuit to prevent idling, and an electric pump operation programming circuit, programmable by the user, arranged in the electric motor junction box.
[0006] It is also a characteristic of the invention that the control circuit comprises an electronic controller which permanently determines the power factor of the charged loaded electric motor, all of this adapted so that when said power factor reaches a certain predetermined minimum value indicative of the idling of the electric motor, the circuit disconnects the electric motor from the power supply.
[0007] Another characteristic of the invention consists of electric motor disconnecting when the power factor reaches a value less than or equal to 0.70.
[0008] According to another characteristic of the invention, the programming circuit comprises a programming keyboard and a viewing screen.
Brief description of the drawings
[0009] In the only figure of the attached drawings, an electric pump equipped with the electric pump operation control device according to the invention is diagrammatically illustrated by way of non-limiting example.
Detailed description of the drawings
[0010] In the figure of the sheet of drawings, an electric pump 1 has been represented, essentially comprised of a suction-discharge multi-stage pump 2 and of an electric motor 3 coaxially coupled together. The multi-stage pump 2 is equipped with a suction inlet 4 and a discharge outlet 5 to which a water pipe, not represented, can be coupled to distribute it to the consumption points. The electric motor 3, which can be an AC short-circuit rotor powered by a single-phase line or a three-phase line, is equipped with a junction box 6 of ample size, equipped with a watertight inlet 7 to permit the passage of the electric conduction to power the electric motor 3.
[0011] An electric motor 3 operating conditions control circuit 8, and an electric pump 1 operation programming circuit 9 are arranged inside the junction box 6.
[0012] The control circuit 8 comprises an electronic controller which, from electric power data of the electric motor 3, such as the terminal voltage and sink current value, permanently determines the power factor of the loaded electric motor 3. The circuit further comprises means to disconnect the electric motor 3 from the supply network when the power factor determined by the electronic controller reaches a value equal to or less than 0.7, values which are indicative that the electric motor 3 is idling, i.e. the water is not pumped by the multi-stage pump 2.
[0013] The programming circuit 9 permits the user to program the electric pump 1 operating conditions adapting, in this way, the electric pump 1 operating periods to the consumption requirements of each specific case, this being particularly advantageous in those installations where automatic operation is required, such as to water garden areas on certain days, at certain times and for a determined period of time. For the purpose of making it easily programmable by the user, the programming circuit 9 comprises a programming keyboard and a viewing screen, not represented.
[0014] The characteristics described in the example of the embodiment of the electric pump operation control device of the invention, provide a solution to the drawbacks derived from the high costs of the installation of control devices external to electric pumps, specifically as regards the control of idling and the programming of the automatic operation of the electric pump. The fact that both the electric motor 3 operating conditions control circuit 8 and the electric pump 1 operation programming circuit 9 are located in the electric motor 3 junction box 6, eliminates the requirement for any type of installations external to the electric pump 1 for devices with said purposes, achieving, in this way, a large reduction in costs of the installations.
1. Electric pump operation control device, which is applicable to electric pumps (1)
comprised of a multi-stage pump (2) and an electric motor (3) coupled together coaxially,
the electric motor (3) being equipped with a junction box (6) adapted for the connection
of an AC line to power the electric motor (3), which comprises an electric motor (3)
operating conditions control circuit (8), to prevent idling, and an electric pump
(1) operation programming circuit (9), programmable by the user, arranged in the electric
motor (3) junction box (6).
2. Control device according to claim 1, characterized in that the control circuit (8) comprises an electronic controller which permanently determines
the power factor of the loaded electric motor (3), all of this adapted so that when
said power factor reaches a certain predetermined minimum value indicative of idling
of the electric motor (3), the circuit disconnects the electric motor (3) from the
electric power line.
3. Control device according to claim 2, characterized in that the electric motor (3) disconnects when the power factor reaches a value less than
or equal to 0.70.
4. Control device according to claim 1, characterized in that the programming circuit (9) comprises a programming keyboard and a viewing screen.
1. Elektropumpen-Betriebs-Steuerungs-Vorrichtung, die für Elektropumpen (1) anwendbar
ist, die eine mehrstufige Pumpe (2) und einen mit ihr koaxial verbundenen Elektromotor
(3) umfasst, wobei der Elektromotor (3) mit einem Kabelkasten (6) ausgestattet ist,
der für die Verbindung mit einer Wechselstromteitung angepasst ist, um den Elektromotor
(3) mit Strom zu versorgen, die einen Elektromotor- (3) Bedingungs-Steuerungs-Kreislauf
(8) umfasst, um einen Leerlauf zu vermeiden, und die einen Elektropumpen- (1) Betriebs-Programmier-Kreislauf
(9) umfasst, der von dem Benutzer programmiert werden kann, und der in dem Elektromotor-
(3) Kabelkasten (6) angeordnet ist.
2. Steuerungs-Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Steuerungs-Kreislauf (8) eine elektronische Steuerung umfasst, die permanent
den Leistungsfaktor des laufenden Elektromotors (3) bestimmt, wobei all dies so angepasst
ist, dass wenn dieser Leistungsfaktor einen gewissen vorher bestimmten minimalen Wert,
der den Leerlauf des Elektromotors (3) anzeigt, erreicht, der Kreislauf den Elektromotor
(3) von der Stromleitung trennt.
3. Steuerungs-Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Elektromotor (3) abschaltet, wenn der Leistungsfaktor einen Wert erreicht, der
weniger als oder genau 0,70 beträgt.
4. Steuerungs-Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Programmier-Kreislauf (9) eine Programmier-Tastatur und einen Bildschirm umfasst.
1. Dispositif de commande de fonctionnement d'une pompe électrique, qui est applicable
aux pompes électriques (1) composées dune pompe à plusieurs étages (2) et d'un moteur
électrique (3) couplés ensemble coaxialement, le moteur électrique (3) étant équipé
d'un boitier a bornes (6) adapté pour la connexion d'une ligue au courant alternatif
pour alimenter le moteur électrique (3), qui comprend un circuit de commande (8) des
conditions de fonctionnement du moteur électrique (3), pour empécher le régime ralenti,
et un circuit de programmation (9) du fonctionnement de la pompe électrique (1) programmable
par l'utilisateur, disposé dona la boîte a bornes (6) du moteur électrique (3).
2. Dispositif de commande selon la revendication 1, caractérisé en ce que le circuit de commande (8) comprend un contróleur électronique qui détermine de maniére
permanente le facteur de puissance du moteur électrique chargé (3), tout cela étant
adapté de maniére à ce que, quand ledit facteur de puissance atteint une certaine
valeur minimum prédéterminée qui indique un régime ralenti du moteur électrique (3),
le circuit déconnecte le moteur électrique (3) de la ligne d'alimentation électrique.
3. Dispositif de comnande selon la revendication 2, caractérisé en ce que le moteur électrique (3) se déconnecte quand le facteur de puissance atteint une
valeur inférieure ou égale à 0,70.
4. Dispositif de commande selon la revendication 1, caractérisé en ce que le circuit de programmation (9) comprend un clavier de programmation et un écran
de vision.