EP2070461B1 - Pumpe für Geschirrspüler und entsprechende Pumpenanordnung und Geschirrspüler - Google Patents

Pumpe für Geschirrspüler und entsprechende Pumpenanordnung und Geschirrspüler Download PDF

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Publication number
EP2070461B1
EP2070461B1 EP08021522.1A EP08021522A EP2070461B1 EP 2070461 B1 EP2070461 B1 EP 2070461B1 EP 08021522 A EP08021522 A EP 08021522A EP 2070461 B1 EP2070461 B1 EP 2070461B1
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EP
European Patent Office
Prior art keywords
pump
control circuitry
electronic
dishwashing machine
electric motor
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Application number
EP08021522.1A
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English (en)
French (fr)
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EP2070461A2 (de
EP2070461A3 (de
Inventor
Elio Marioni
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.)
Askoll Holding SRL
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Askoll Holding SRL
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Publication of EP2070461A3 publication Critical patent/EP2070461A3/de
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps

Definitions

  • the present invention relates to a pump for a dishwashing machine, comprising an electric motor, an impeller and electronic motor control circuitry, said electric motor being able to rotate said impeller, said electronic motor control circuitry being able to control said electric motor.
  • the present invention relates to a pump assembly for dishwashing machines comprising a master pump of said type.
  • the present invention relates to a dishwashing machine comprising said pump assembly, said dishwashing machine being hydraulically connected, on the inlet side, to a water distribution system, by means of suction, provided by at least one washing pump and, on the outlet side, to the water distribution system by means of at least one discharge pump.
  • a dishwashing machine is equipped with a suitable pump assembly (or electric pump assembly, since it comprises an electric motor).
  • This type of dishwashing machine is connected, on the inlet side, to a water distribution system, by means of conduits, in order to receive clean water, and is connected on the outlet side to a drain in order to drain dirty water.
  • Such a dishwashing machine normally comprises at least two pumps, in particular at least a washing pump and a discharge pump.
  • washing pump water drawn from the water distribution system, combined with a specific detergent, this solution being also called lye, is sprayed onto the dishes.
  • the lye and suspended dirt is sucked, by means of the discharge pump, and is expelled towards the waste water system.
  • FIG. 1 An example of a traditional dishwashing machine is illustrated in figs. 1-2 and one of its discharge pumps is illustrated in fig. 3 , said dishwashing machine being generally referenced at 1 and said pump assembly being referenced at 6.
  • the dishwashing machine 1 is hydraulically connected, on the inlet side, to the water distribution system, by means of suction provided by the washing pump 2, and, on the outlet side, by means of pressure provided by the discharge pump 3.
  • An electric heater 5, of the resistor type, is such as to heat the lye to be sprayed onto the dishes.
  • the washing pump comprises an electric motor, which comprises a rotatable rotor, and a fixed stator.
  • the rotor which is protected by a sleeve of thermoplastic material, is integral with a shaft, which is force fitted to an impeller. In this way, the rotor is mechanically connected to the impeller.
  • the impeller is of the type with directional vanes.
  • the synchronous electric motor of the washing pump is in this case of the so called electronic startup type.
  • the synchronous electric motor is controlled by electronic motor control circuitry, for instance of the vector or PWM type, which is expensive and difficult to implement in small spaces, such as inside a dishwashing pump.
  • the discharge pump 3, illustrated in fig. 3 comprises an electric motor 31, of the synchronous type, with permanent magnets, said electric motor 31 comprising a rotatable rotor 310, and a fixed stator 311, of the diapason type.
  • the rotor 310 which is protected by the sleeve 312, of thermoplastic material, is integral with a shaft 32, which is forced fitted with an impeller 33. In this way, the rotor 310 is mechanically connected to impeller 33.
  • the pump 3 comprises a mechanical joint 39, which facilitates the automatic start up of the synchronous motor, by disengaging it from the load.
  • the synchronous electric motor 31 of the discharge pump may be theoretically controlled by the electronic motor control circuits, which is for example of the vector or PWM type.
  • the electronic motor control circuits which is for example of the vector or PWM type.
  • such electronic motor control circuitry is expensive and difficult to implement.
  • the electric synchronous motor of the discharge pump is not electronically controlled.
  • the electric synchronous motor of the discharge pump is directly supplied by the home power supply and rotates at synchronous speed with the electric network, i.e. proportional to 50 Hz or 60 Hz.
  • the electric synchronous motor has to be oversized, for instance by providing a high number of coil turns, and therefore by providing a high quantity of copper, or by increasing the section of magnetic poles, using iron, or by increasing magnet volume, using costly permanent magnets.
  • the discharge pump has necessarily to have a straight vane impeller, which is hydraulically less effective than a directional vane impeller, and in this case the use of undesired hydraulic and/or mechanical means is required, for allowing water to flow according to a predetermined direction.
  • Document EP 0 735 273 discloses a pump comprising two impellers arranged in a single casing, said impellers being driven by separate electric motors.
  • the electric motors are controlled by a common electronic unit.
  • Document DE 44 24 257 discloses a prior art centrifugal pump driven by a single-phase synchronous motor, suitable to be mounted in a dishwasher.
  • the technical problem to be solved by the present invention is to provide a dishwashing machine, a pump assembly and pumps, which solve the above said problems, without any further cost with respect to the typical solution of the known art.
  • the solution concept provided by the present invention is based on the finding, that the use of washing and discharge pumps in a dishwashing machine comprise operation periods which normally are not superimposed.
  • a pump for a dishwashing machine comprising an electric motor, an impeller and electronic motor control circuitry, said electric motor being able to rotate said impeller, said electronic motor control circuitry being able to control said electric motor, characterized in that said electronic motor control circuitry comprises connections to an additional electric motor of an additional pump, also called slave pump.
  • Such a pump may operate as a master for further slave pumps.
  • a pump assembly for dishwashing machine comprising a master pump and at least one slave pump, said master pump being of above said type, said at least one slave pump being electrically connected to said electronic motor control circuitry and being controlled by said electronic motor control circuitry, belonging to the master pump.
  • a pump assembly comprising a master pump and a slave pump, the master pump being the only one to have electronic circuits, though being able to also control, by means of said electronic circuitry, the slave pump.
  • the master pump may be the washing pump and the slave pump may be the discharge pump.
  • a dishwashing machine comprising above said pump assembly, said dishwashing machine being hydraulically connected on the inlet side to the water distribution system, providing suction by means of said at least one washing pump and on the outlet side to the same water distribution system or to a drain, by means of said at least one discharge pump.
  • the slave pump may be as quite, economic, and correctly sized with respect to application requirements, and efficient as the master pump.
  • Fig. 4 shows a simplified electrical sketch of a dishwashing machine.
  • the dishwashing machine 1' comprises a pump assembly 6', comprising a washing pump 2', which represents the master pump, and a discharge pump 3', which is the slave pump.
  • the dishwashing machine 1' comprises a dishwashing machine controlling electronic circuitry 54', which includes a user interface 58' (provided for instance with a keyboard for command input by the user) and a dishwashing machine control board.
  • the latter which is usually a microprocessor, is such as to control the operation of dishwashing machine 1', in particular for controlling the pump assembly 6'.
  • the washing pump 2' comprises an electric motor 21'.
  • the electric motor 21' comprises a rotor 210', which is rotatable, and a fixed stator 211'.
  • the rotor 210' which is protected by a sleeve 212' of thermoplastic material, is integral with a shaft 22', which is force fitted with an impeller 23'.
  • the rotor 210' is mechanically connected to the impeller 23'.
  • the impeller 23' has directional vanes.
  • the washing pump 2' comprises an electronic circuitry 27' comprising, in its present embodiment, a logical unit 24', a power electronics unit 25' and a switching unit 26'.
  • the logical unit 24' which in this case is formed by a microprocessor board, is structured to control the power electronics unit 25'.
  • the power electronics unit 25' which for example comprises a bridged inverter (in the present case, of single phase type) is controlled by the logical unit 24' and is supplied by means of a power line 5 through the home power electronics 5 at 220 V and 50 Hz.
  • the power electronics unit 25' is able to supply the synchronous electric motor 21'.
  • the switching unit 26' is controlled by the logical unit 24', and has power switches which are controlled by outputs of the logical unit 24.
  • An output of switching unit 26' is connected, by means of connection 26B', to the washing pump 2'.
  • electric power may be supplied to the electric synchronous motor 21' of the washing pump 2' by the inverter 25, in a traditional way, when switching the unit 26', controlled by the logic 24', allows such a connection.
  • the discharge pump 3' comprises an electric motor 31', of the synchronous type, with permanent magnets, said electric motor 31' comprising a rotatable rotor and a fixed stator, of the diapason type.
  • the rotor of the synchronous electric motor 31' which is protected by a sleeve of thermoplastic material, is integral with a shaft 32', which is force fitted with an impeller 33'. In this way, the rotor of the electric synchronous motor 31' is mechanically connected to the impeller 33.
  • the impeller 33' is of the directional vane type.
  • the discharge pump does not comprise electronic motor control circuitry, since the electric motor 31' may be supplied with electric power by the power electronics unit 25', which is provided in the electronic motor control circuitry 27' of the washing pump 2'.
  • the electronic motor control circuitry 27' is in fact electrically connected, by means of connection 26A', to the motor 31', the power electronics unit 25' supplying the motor 31' with electric power, when the switching unit 26', controlled by the logical unit 24', commands such a connection.
  • switching unit 26' which commands the connection of power electronics unit 25' alternatively to the electric synchronous motor 21' or to the electric synchronous motor 31', is controlled by logical unit 24', which is in turn controlled by the electronic dishwashing machine controlling circuitry 54'.
  • the logical unit 24' runs software suitable for the electric motor 21' as well as for the electric motor 31'.
  • the dishwashing machine 1' does not operate the washing and discharge pump at the same time.
  • a pump assembly is provided, with a master pump and a slave pump (or more than one slave pump), wherein the master pump is able to control the operation of the whole pump assembly.
  • the single phase electric synchronous motor is no more a bidirectional motor, and, further, the vanes may be of the spoon type, providing a higher hydraulic efficiency.
  • An alternative embodiment of the present invention foresees the use of the discharge pump as a master pump and of the washing pump as a slave pump.
  • the electronic motor control circuitry is provided within the discharge pump and not within the washing pump.
  • the pump assembly according to the invention comprises more than one washing pump and more than one discharge pump. In this case, there would be always a master pump and the remaining pumps would be the slave pumps.
  • the electronic motor control circuitry 27 is provided only for illustration purposes, being evident that it is possible, by suitably designing its layout, to entirely integrate the same on a single board.
  • the electric motors are not necessarily of the synchronous type, although best results are obtained with this type of motor, in terms of global efficiency of washing and discharging operation.
  • the only requirements for the software for managing the dishwashing machine controlling circuitry is to indicate, in real time, which pump and which washing program is required.
  • the master pump manages all remaining operations of pump assembly.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Washing And Drying Of Tableware (AREA)

Claims (13)

  1. Pumpe (2') für Geschirrspülmaschinen, umfassend einen Elektromotor (21'), ein Laufrad (23') und eine elektronische Motorkontrollschaltung (27'), wobei der Elektromotor (21') geeignet ist, das Laufrad (23') in Drehung zu versetzen, wobei die elektronische Motorkontrollschaltung (27') geeignet ist, den Elektromotor (21') zu steuern, wobei die elektronische Motorkontrollschaltung (27') Anschlüsse (26B') umfasst, die mit einem zusätzlichen Elektromotor (31') einer zusätzlichen Pumpe (3') verbindbar sind; wobei die elektronische Motorkontrollschaltung (27') eine logische Einheit (24') und eine Stromversorgungseinheit (25') umfasst, dadurch gekennzeichnet, dass die elektronische Motorkontrollschaltung weiterhin eine Schalteinheit (26') umfasst, die von der logischen Einheit (24') kontrolliert wird, welche die Verbindung der Stromversorgungseinheit (25') alternativ zu dem Elektromotor (21') oder zu dem zusätzlichen Elektromotor (31') steuert.
  2. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass der Elektromotor (21') vom synchronen Einphasentyp versehen mit Permanentmagneten ist.
  3. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Laufrad (23') vom Richtflügel-Typ ist.
  4. Pumpe nach einem der vorhergehenden Ansprüche, wobei in der logischen Einheit (24') Software zum Steuern des Betriebs der Stromversorgungseinheit (25') zum alternativen Zuführen von Energie zu dem elektrischen Synchronmotor (21') und dem weiteren Elektromotor (31') läuft, wobei die logische Einheit mit der Schalteinheit (26') verbunden ist, um die Verbindung zwischen der Stromversorgungseinheit (25') und den Elektromotoren (21', 31') zu ermöglichen.
  5. Pumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Stromversorgungseinheit (25 ') einen Wechselrichter aufweist.
  6. Pumpenanordnung für Geschirrspülmaschinen (6'), dadurch gekennzeichnet, dass sie eine Hauptpumpe (2') und mindestens eine Nebenpumpe (3') aufweist, wobei die Hauptpumpe (2') nach einem der vorhergehenden Ansprüche ausgebildet ist, wobei mindestens eine Nebenpumpe (3') elektrisch mit der elektronischen Motorkontrollschaltung (27') verbunden ist und von der elektronischen Motorkontrollschaltung (27') elektronisch gesteuert wird.
  7. Pumpenanordnung nach Anspruch 6, dadurch gekennzeichnet, dass die Hauptpumpe eine Waschpumpe für Geschirrspülmaschinen (2') ist, wobei die mindestens eine Nebenpumpe die Ausstoßpumpe (3') der Geschirrspülmaschine ist.
  8. Pumpenanordnung nach einem der vorhergehenden Ansprüche 6 oder 7, dadurch gekennzeichnet, dass die Hauptpumpe eine erste Waschpumpe (2') ist, wobei die mindestens eine Nebenpumpe eine zusätzliche Waschpumpe umfasst.
  9. Pumpenanordnung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass mindestens eine der mindestens einen Hauptpumpe (2') und mindestens eine Nebenpumpe (3') vom synchronen Typ ist.
  10. Pumpenanordnung für Geschirrspülmaschinen nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die mindestens eine der mindestens einen Hauptpumpen (2') und mindestens eine Nebenpumpe (3') einen Elektromotor (21', 31') vom Permanentmagnettyp aufweist.
  11. Pumpenanordnung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass mindestens eine Nebenpumpe (3') ein Laufrad (33') mit Richtschaufeln aufweist.
  12. Geschirrspülmaschine (1') mit einer Pumpenanordnung nach einem der Ansprüche 6 bis 11, wobei die Geschirrspülmaschine (1') eingangsseitig mit dem Wasserverteilungssystem durch Saugwirkung hydraulisch über die mindestens eine Waschpumpe (2') verbunden ist und auf der Auslassseite mit dem Wasserverteilungssystem oder einem Abfluss mittels der mindestens einen Auslasspumpe (3') verbunden ist.
  13. Geschirrspülmaschine nach Anspruch 12 umfassend eine elektronische Geschirrspülmaschinenkontrollschaltung (57'), die mit der elektronischen Motorkontrollschaltung (27') verbunden ist, wobei die elektronische Geschirrspülmaschinenkontrollschaltung (57') eine Ausgangsverbindung zu der elektronischen Motorkontrollschaltung umfasst (27'), um die Schalteinheit (26') zu kontrollieren.
EP08021522.1A 2007-12-11 2008-12-11 Pumpe für Geschirrspüler und entsprechende Pumpenanordnung und Geschirrspüler Active EP2070461B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT002318A ITMI20072318A1 (it) 2007-12-11 2007-12-11 Pompa per lavastoviglie e relativi gruppo di pompe e lavastoviglie.

Publications (3)

Publication Number Publication Date
EP2070461A2 EP2070461A2 (de) 2009-06-17
EP2070461A3 EP2070461A3 (de) 2010-03-10
EP2070461B1 true EP2070461B1 (de) 2017-10-18

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EP08021522.1A Active EP2070461B1 (de) 2007-12-11 2008-12-11 Pumpe für Geschirrspüler und entsprechende Pumpenanordnung und Geschirrspüler

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EP (1) EP2070461B1 (de)
IT (1) ITMI20072318A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8575873B2 (en) 2010-08-06 2013-11-05 Nidec Motor Corporation Electric motor and motor control

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4424257C2 (de) * 1994-07-09 1999-03-18 Aweco Kunststofftech Geraete Zentrifugalpumpe hoher Leistung mit Einphasensynchronmotorantrieb
DE19511170A1 (de) * 1995-03-28 1996-10-02 Wilo Gmbh Doppelpumpe mit übergeordneter Steuerung
DE10393408D2 (de) * 2002-08-23 2005-07-14 Aweco Appliance Sys Gmbh & Co Haushaltsmaschine
DE102005011732A1 (de) * 2004-12-15 2006-07-20 Aweco Appliance Systems Gmbh & Co. Kg Haushaltsmaschine
DE102007024799A1 (de) * 2007-05-26 2008-11-27 Premark Feg L.L.C., Wilmington Gewerbliche Geschirrspülmaschine

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EP2070461A2 (de) 2009-06-17
EP2070461A3 (de) 2010-03-10
ITMI20072318A1 (it) 2009-06-12

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