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EP0326893A2 - Dish washer - Google Patents

Dish washer Download PDF

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Publication number
EP0326893A2
EP0326893A2 EP89101093A EP89101093A EP0326893A2 EP 0326893 A2 EP0326893 A2 EP 0326893A2 EP 89101093 A EP89101093 A EP 89101093A EP 89101093 A EP89101093 A EP 89101093A EP 0326893 A2 EP0326893 A2 EP 0326893A2
Authority
EP
European Patent Office
Prior art keywords
electric motor
inlet valve
water inlet
water
dishwasher
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.)
Withdrawn
Application number
EP89101093A
Other languages
German (de)
French (fr)
Other versions
EP0326893A3 (en
Inventor
Hans Haverkamp
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.)
Hanning Elektro Werke GmbH and Co KG
Original Assignee
Hanning Elektro Werke GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hanning Elektro Werke GmbH and Co KG filed Critical Hanning Elektro Werke GmbH and Co KG
Publication of EP0326893A2 publication Critical patent/EP0326893A2/en
Publication of EP0326893A3 publication Critical patent/EP0326893A3/en
Withdrawn legal-status Critical Current

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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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0021—Regulation of operational steps within the washing processes, e.g. optimisation or improvement of operational steps depending from the detergent nature or from the condition of the crockery
    • A47L15/0023—Water filling
    • 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
    • A47L15/4244—Water-level measuring or regulating arrangements
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/08—Drain or recirculation pump parameters, e.g. pump rotational speed or current absorbed by the motor
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/14—Water pressure or flow rate
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/24—Spray arms status, e.g. detection of spray arm rotation
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/32—Vibration or sound detection
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet valve

Definitions

  • the invention relates to a dishwasher with a spray system, which is fed with cleaning liquid by means of a circulation pump driven by an electric motor from a collecting trough having a water inlet valve.
  • a circulation pump driven by an electric motor from a collecting trough having a water inlet valve.
  • a lower water supply also has an advantageous effect on the machine's noise level.
  • the object of the invention is to make a dishwasher available, the water supply of which is regulated in such a way that there is only as much cleaning liquid in the collecting pan as is necessary, so that the circulation pump is largely free of air and therefore noiseless is working.
  • FIGS. 1-4 show several exemplary embodiments of the invention.
  • 6 - 9 also show measurement diagrams of a conventional dishwasher, which provide evidence that the determination of the stable operating state of the circulation pump and, at the same time, the determination of the required one Amount of water in the machine is possible in the sense of the claimed measures
  • the operating behavior of the circulation pump during the water inlet can always be seen in the same way.
  • the pump initially runs empty until there are irregular pressure and load surges when the collection tank reaches a certain minimum fill. Only after the pump has completely filled does a condition without performance fluctuations and consequently a stable running behavior appear.
  • the stable state not only occurs at the same point regardless of the measuring method involved, but it also depends on whether only water is used or different detergents are used. In this way, additional water and energy can be saved in that the amount of water in the individual rinse cycles can be precisely adapted to the changing consistency of the cleaning liquid.
  • the closing of the water inlet valve which, in contrast to the prior art, can be a very simple inlet valve, is initiated at the right time, which means that the dishwasher according to the invention has both the lowest possible water and energy requirements and is capable of doing so is to work quieter.

Landscapes

  • Washing And Drying Of Tableware (AREA)

Abstract

The dishwasher has a spraying system which is fed with cleaning liquid from a collection trough, which has a water inlet valve, by means of a circulation pump, driven by an electric motor. Means are provided for measuring the current input and/or the capacitor voltage and/or the rotational speed of the electric motor or of the liquid pressure and/or the flow rate in the spraying system or the noise level or the vibrations of the machine, which means cause the water inlet valve to close after a minimum filling level of the collection trough has been reached and a uniform measuring value has been obtained. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Geschirrspülmaschine mit einem Sprühsystem, das mittels einer von einem Elek­tromotor angetriebenen Umlaufpumpe aus einer über ein Wasserzulaufventil verfügenden Sammelwanne mit Reini­gungsflüssigkeit gespeist wird. Bei solchen Geschirrspül­maschinen gibt es allgemeine Bestrebungen, den Wasserver­brauch, von dem gleichzeitig auch die zum Aufheizen des Wassers benötigte Energiemenge abhängig ist, so niedrig wie möglich zu halten. Ebenso wirkt sich eine geringere Wasserzufuhr vorteilhaft auf die Geräuschbildung der Ma­schine aus.The invention relates to a dishwasher with a spray system, which is fed with cleaning liquid by means of a circulation pump driven by an electric motor from a collecting trough having a water inlet valve. In such dishwashers there are general efforts to keep the water consumption, on which at the same time the amount of energy required to heat the water, as low as possible. A lower water supply also has an advantageous effect on the machine's noise level.

Bei bekannten Geschirrspülmaschinen wird deren Wasserfül­lung entweder durch die Verwendung von Niveauschaltern oder einer Regeldüse im Magnetventil über die Einlaufzeit bestimmt. Beide Systeme gestatten aber nur, der Maschine jeweils eine vorbestimmte Wassermenge zuzuführen, die allerdings nicht dem optimalen Wert entspricht, sondern vielmehr zu groß bemessen ist. Der Grund hierfür besteht darin, daß ein Sicherheitszuschlag gegeben werden muß, um die mit unangenehmen Arbeitsgeräuschen verbundene Kavita­tion in der Umlaufpumpe, die sich immer dann ergibt, wenn von ihr mit Luft vermischtes Wasser gefördert wird, nur beim Anlaufen der Maschine auftreten zu lassen, jedoch während des eingentlichen Betriebes unbedingt zu vermeiden.In known dishwashers, their water filling is determined either by using level switches or a regulating nozzle in the solenoid valve over the running-in time. However, both systems only allow the machine in each case to supply a predetermined amount of water, which, however, does not correspond to the optimal value, but rather is too large. The reason for this is that a safety margin has to be added in order to only allow the cavitation in the circulation pump, which is associated with unpleasant working noises, which occurs whenever water mixed with air to be conveyed by it, only to occur when the machine is started to be avoided during normal operation.

Unter den vorstehend angeführten Gesichtspunkten besteht die Aufgabe der Erfindung darin, eine Geschirrspülma­schine verfügbar zu machen, deren Wasserzufuhr so gere­gelt wird, daß sich in der Sammelwanne jeweils gerade nur so viel Reinigungsflüssigkeit befindet, wie erforder­lich ist, damit die Umlaufpumpe ohne Lufteinschlüsse und insofern weitgehend geräuschfrei arbeitet.From the above-mentioned points of view, the object of the invention is to make a dishwasher available, the water supply of which is regulated in such a way that there is only as much cleaning liquid in the collecting pan as is necessary, so that the circulation pump is largely free of air and therefore noiseless is working.

Die Lösung der gestellten Aufgabe geht aus den Ansprüchen sowie aus den Schaltbildern der Fig. 1 - 4 hervor, die zusammen mit der Fig. 5 mehrere Ausführungsbeispiele der Erfindung zeigen. In den Fig. 6 - 9 sind außerdem noch Meßdiagramme einer herkömmlichen Geschirrspülmaschine wiedergegeben, die den Nachweis erbringen, daß die Fest­stellung des stabilen Betriebszustandes der Umlaufpumpe und zugleich also auch die Bestimmung der erforderlichen Wassermenge in der Maschine im Sinne der beanspruchten Maßnahmen möglich ist.The solution to the problem is evident from the claims and from the circuit diagrams of FIGS. 1-4, which together with FIG. 5 show several exemplary embodiments of the invention. 6 - 9 also show measurement diagrams of a conventional dishwasher, which provide evidence that the determination of the stable operating state of the circulation pump and, at the same time, the determination of the required one Amount of water in the machine is possible in the sense of the claimed measures

Die in den Fig. 1 - 4 enthaltenen Bezugszeichen haben folgende Bedeutung:

  • Fig. 1
    • 1 = Strommeßeinrichtung (Shunt)
    • 2 = Verstärker mit Gleichrichter
    • 3 = Hochpaß
    • 4 = Pumpenmotor
    • 5 = Komparator (vorzugsweise mit Hysterese)
    • 6 = Schaltsignal für Wasserzulaufventil
  • Fig. 2
    • 1 = Strommeßeinrichtung (Shunt)
    • 2 = Verstärker mit Gleichrichter
    • 3 = Hochpaß mit Verstärker
    • 4 = Pumpenmotor
    • 7 = Komparatoren
    • 8 = Schalter
    • 9 = Magnetventil (Wasserzulaufventil)
  • Fig. 3
    • 10 = Phasendiskriminator
    • 11 = Hochpaßfilter
    • 12 = Komparator
    • 13 = Einphaseninduktionsmotor
    • 14 = Ausgangssignal für Wasserzulaufventil
  • Fig. 4
    • 20 = Mikrofon (Körperschall-Piezomikrofon)
    • 21 = Verstärker
    • 22 = Gleichrichter
    • 23 = Komparator
    • 24 = Schaltsignal für Wasserzulaufventil
The reference symbols contained in FIGS. 1-4 have the following meaning:
  • Fig. 1
    • 1 = current measuring device (shunt)
    • 2 = amplifier with rectifier
    • 3 = high pass
    • 4 = pump motor
    • 5 = comparator (preferably with hysteresis)
    • 6 = switching signal for water inlet valve
  • Fig. 2
    • 1 = current measuring device (shunt)
    • 2 = amplifier with rectifier
    • 3 = high pass with amplifier
    • 4 = pump motor
    • 7 = comparators
    • 8 = switch
    • 9 = solenoid valve (water supply valve)
  • Fig. 3
    • 10 = phase discriminator
    • 11 = high pass filter
    • 12 = comparator
    • 13 = single-phase induction motor
    • 14 = output signal for water inlet valve
  • Fig. 4
    • 20 = microphone (structure-borne piezo microphone)
    • 21 = amplifier
    • 22 = rectifier
    • 23 = comparator
    • 24 = switching signal for water inlet valve

Wie die Meßdiagramme der Fig. 6 - 9 übereinstimmend er­kennen lassen, ist das Betriebsverhalten der Umlaufpumpe während des Wassereinlaufs stets in derselben Weise dar­aus zu entnehmen. So läuft die Pumpe zunächst einmal leer, bis es beim Erreichen einer gewissen Mindestfüllung der Sammelwanne in unregelmäßigen Abständen zu unterschiedli­chen Druck- und Belastungsstößen kommt. Erst nachdem sich die Pumpe völlig gefüllt hat, stellt sich ein Zustand ohne Leistungsschwankungen und demzufolge ein stabiles Laufverhalten ein. Dieser auf verschiedenen Wegen, näm­lich über die Stromaufnahme oder die Kondensatorspannung des Pumpenmotors, den Flüssigkeitsdruck im Sprühsystem, aber auch die Motordrehzahl, die Strömungsgeschwindigkeit der geförderten Reinigungsflüssigkeit oder den Geräusch­pegel bzw. die Erschütterungen der Maschine eindeutig meßbare, in den Diagrammen durch eine strichpunktierte senkrechte Linie kenntlich gemachte bestmögliche Betriebs­punkt kann dann zum Schließen des Wasserzulaufventils benutzt werden, so daß man mit einer erheblich geringeren Wassermenge auskommen kann, als sie gegenwärtig zu be­ stimmen und daher üblich ist.As can be seen from the measurement diagrams in FIGS. 6-9, the operating behavior of the circulation pump during the water inlet can always be seen in the same way. The pump initially runs empty until there are irregular pressure and load surges when the collection tank reaches a certain minimum fill. Only after the pump has completely filled does a condition without performance fluctuations and consequently a stable running behavior appear. This can be clearly measured in various ways, namely via the current consumption or the capacitor voltage of the pump motor, the liquid pressure in the spray system, but also the motor speed, the flow speed of the conveyed cleaning liquid or the noise level or the vibrations of the machine, in the diagrams by a dash-dotted vertical line identified best possible operating point can then be used to close the water inlet valve, so that you can get by with a significantly smaller amount of water than they are currently agree and is therefore common.

Entsprechend den Diagrammen der Fig. 6 - 9 tritt der sta­bile Zustand nicht nur unabhängig vom jeweiligen Meßver­fahren immer an derselben Stelle ein, sondern er ist auch abhängig davon, ob lediglich mit klarem Wasser oder mit verschiedenen Spülmitteln gearbeitet wird. Auf diese Wei­se ist noch zusätzlich Wasser und Energie einzusparen, indem sich die Wassermenge in den einzelnen Spülgängen der wechselnden Konsistenz der Reinigungsflüssigkeit ge­nauestens anpassen läßt. In jedem Falle wird das Schlie­ßen der Wasserzulaufventils, bei dem es sich zum Unter­schied vom Stand der Technik um ein ganz einfaches Ein­laßventil handeln kann, im richtigen Zeitpunkt veranlaßt, womit die erfindungsgemäße Geschirrspülmaschine sowohl den geringstmöglichen Wasser- und Energiebedarf aufweist, als auch in der Lage ist, geräuschärmer zu arbeiten.According to the diagrams in FIGS. 6 - 9, the stable state not only occurs at the same point regardless of the measuring method involved, but it also depends on whether only water is used or different detergents are used. In this way, additional water and energy can be saved in that the amount of water in the individual rinse cycles can be precisely adapted to the changing consistency of the cleaning liquid. In any case, the closing of the water inlet valve, which, in contrast to the prior art, can be a very simple inlet valve, is initiated at the right time, which means that the dishwasher according to the invention has both the lowest possible water and energy requirements and is capable of doing so is to work quieter.

Claims (2)

1. Geschirrspülmaschine mit einem Sprühsystem, das mit­tels einer von einem Elektromotor angetriebenen Um­laufpumpe aus einer über ein Wasserzulaufventil ver­fügenden Sammelwanne mit Reinigungsflüssigkeit ge­speist wird,
dadurch gekennzeichnet, daß Mittel zum Messen der Stromaufnahme und/oder der Kondensatorspannung und/­oder der Drehzahl des Elektromotors oder des Flüssig­keitsdruckes und/oder der Strömungsgeschwindigkeit im Sprühsystem oder des Geräuschpegels oder der Er­schütterungen der Maschine vorgesehen sind, die nach einer abgeschlossenen Mindestfüllung der Sammelwanne beim Erreichen eines gleichbleibenden Meßwertes das Schließen des Wasserzulaufventils veranlassen.1. Dishwasher with a spray system, which is fed with cleaning liquid by means of a circulation pump driven by an electric motor from a collecting trough having a water inlet valve,
characterized in that means for measuring the current consumption and / or the capacitor voltage and / or the speed of the electric motor or the liquid pressure and / or the flow rate in the spray system or the noise level or the vibrations of the machine are provided, which after a completed minimum filling of the collecting pan at If the measured value has reached a constant level, close the water supply valve. 2. Geschirrspülmaschine nach Anspruch 1, dadurch gekenn­zeichnet, daß die Durchführung und das Auswerten der Messungen auf elektronischem Wege erfolgen.2. Dishwasher according to claim 1, characterized in that the implementation and evaluation of the measurements are carried out electronically.
EP89101093A 1988-02-02 1989-01-23 Dish washer Withdrawn EP0326893A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883803006 DE3803006A1 (en) 1988-02-02 1988-02-02 DISHWASHER
DE3803006 1988-02-02

Publications (2)

Publication Number Publication Date
EP0326893A2 true EP0326893A2 (en) 1989-08-09
EP0326893A3 EP0326893A3 (en) 1990-03-21

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Family Applications (1)

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EP89101093A Withdrawn EP0326893A3 (en) 1988-02-02 1989-01-23 Dish washer

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EP (1) EP0326893A3 (en)
DE (1) DE3803006A1 (en)

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EP0721761A3 (en) * 1995-01-12 1996-11-20 Electrolux Zanussi Elettrodome Washing machine with dynamic water inlet control arrangement
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US20180310799A1 (en) * 2015-11-19 2018-11-01 Electrolux Appliances Aktiebolag Estimating water fill rate in an appliance for washing and rinsing goods
US10244919B2 (en) 2012-11-08 2019-04-02 Electrolux Home Products Corporation N.V. Detecting operational state of a dishwasher
EP3488756A1 (en) * 2017-11-24 2019-05-29 Vestel Elektronik Sanayi ve Ticaret A.S. Dishwashing machine and method
US10595703B2 (en) 2015-11-10 2020-03-24 Electrolux Appliances Aktiebolag Method of determining whether process water is present in a circulation pump of an appliance for washing and rinsing goods, and appliance and computer program therewith
EP1737332B2 (en) † 2004-03-16 2020-06-10 Arçelik Anonim Sirketi A dishwasher and control method thereof
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US11019979B2 (en) 2016-02-15 2021-06-01 Electrolux Appliances Aktiebolag Process water flow detection in circulation pump
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EP1967121A1 (en) 2007-03-06 2008-09-10 Miele &amp; Cie. KG Method for causing water to flow into the detergent holder of a dishwasher
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