EP2381827B1 - Method for pumping a fluid out of an aquiferous household device - Google Patents

Method for pumping a fluid out of an aquiferous household device Download PDF

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Publication number
EP2381827B1
EP2381827B1 EP09799572.4A EP09799572A EP2381827B1 EP 2381827 B1 EP2381827 B1 EP 2381827B1 EP 09799572 A EP09799572 A EP 09799572A EP 2381827 B1 EP2381827 B1 EP 2381827B1
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EP
European Patent Office
Prior art keywords
speed
circulation pump
household device
pump
nmin
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.)
Active
Application number
EP09799572.4A
Other languages
German (de)
French (fr)
Other versions
EP2381827A2 (en
Inventor
Michael Fauth
Erwin Oberstaller
Andreas Reiter
Roland Rieger
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Priority to PL09799572T priority Critical patent/PL2381827T3/en
Publication of EP2381827A2 publication Critical patent/EP2381827A2/en
Application granted granted Critical
Publication of EP2381827B1 publication Critical patent/EP2381827B1/en
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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
    • A47L15/0031—Water discharge phases
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps
    • 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
    • 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
    • A47L2401/20—Time, e.g. elapsed operating time
    • 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
    • A47L2501/02—Water discharge, e.g. opening or closure of discharge valve
    • 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
    • A47L2501/05—Drain or recirculation pump, e.g. regulation of the pump rotational speed or flow direction
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/42—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to filters or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0324—With control of flow by a condition or characteristic of a fluid

Definitions

  • the invention relates to a method for pumping out a liquid from a water-conducting domestic appliance, in particular from a household dishwasher, according to the preamble of patent claim 1.
  • Domestic water appliances such as domestic dishwashers, include a recirculating pump for circulating liquid to allow them to spray such as e.g. supply rotating spray arms, which can be applied to be cleaned dishes with liquid.
  • a drain pump is provided which can be connected to a house-side sewage disposal system.
  • the circulating pump is operated in parallel, i. There is a simultaneous operation of both pumps instead.
  • the EP 1 882 438 A1 referenced which discloses a corresponding Mullsgesrhirr Wegmaschine.
  • the emptying of the washing liquid takes place at least initially running circulation pump.
  • both the circulation pump and the drain pump are in operation, so that the solution results in increased energy consumption of the system.
  • the object of the invention is based on a method for pumping out a liquid from a water-conducting household appliance, in particular a domestic dishwasher, during which at least temporarily water is conveyed for operating a drain pump from the water-conducting household appliance and at least water is temporarily circulated to operate a circulating pump.
  • the rotational speed of the circulating pump is lowered before start-up of the drain pump substantially pressure surge free of a maximum speed at least up to a minimum speed.
  • the rotational speed of the circulation pump is reduced in the first step before starting up the drain pump from a maximum speed to a minimum speed.
  • the speed of the circulation pump from the maximum speed to the minimum speed is reduced at least temporarily linear, i. at a constant rate over time.
  • the number of revolutions of the circulation pump from the maximum speed to the minimum speed may also be reduced correspondingly stepwise with a plurality of steps or an exponential function.
  • Time of 10 to 15 seconds is reduced from the maximum speed to the minimum speed. This makes it possible to exclude a scrubanschmutzung and at the same time to leave the duration of an Abpumpvorgangs almost unchanged.
  • the speed is reduced from 0 to the minimum speed. That is, the operation of the circulation pump is completely stopped.
  • the duration of the pumping process can be reduced to a minimum. It is provided in a development that after the second step by operating the drain pump, an amount of liquid is pumped out. That is, there is no simultaneous or simultaneous operation of the drain pump and the circulation pump instead.
  • the circulation pump is operated. That is, the operation of the circulation pump is interrupted during the Abpumpvorgangs at least once of a phase during which an Abpumpvorgang is performed with the drain pump.
  • the circulating pump is at least temporarily operated at a medium speed, which is between the maximum speed and the minimum speed at which the circulation pump is operated.
  • a medium speed which is between the maximum speed and the minimum speed at which the circulation pump is operated.
  • the dishwasher is operated during operation with the medium speed in a lower basket spray. That is, the dishwasher has an upper and a lower spray, each associated with an upper and a lower Geschinicorb, with an operation is possible, in which either only the upper basket with its associated sprayer or the lower basket with its associated Sprayer is operated. This ensures that any residues of dirt that have come loose, are transported back to the filter device.
  • the circulating pump is operated substantially for a period of time between 5 and 60 seconds, in particular between 10 and 30 seconds.
  • the rotational speed of the circulating pump is reduced in at least two steps when the circulating pump is operated after deactivation of the drain pump. As a result, a cleaning of the filter device can be effected.
  • the speed of the circulation pump in a first step before operating the drain pump from the average speed to a minimum speed wherein in a development, the speed of the circulation pump from the central speed to the minimum speed is at least temporarily reduced.
  • the number of revolutions of the circulating pump from the center speed to the minimum speed may be gradually reduced by a plurality of steps or an exponential function.
  • the rotational speed of the circulating pump is reduced from the maximum rotational speed to the minimum rotational speed essentially in a time duration of 3 to 60 seconds, in particular in a time duration of 8 to 12 seconds.
  • a second quantity of liquid is pumped out by operating the drain pump.
  • the second amount of liquid is less than the first amount of liquid.
  • the maximum speed substantially between 2000 and 3000 revolutions per minute, in particular between 2300 and 2700 per minute, is chosen. This allows an energy-efficient operation of the circulation pump with simultaneously reduced noise emission.
  • the minimum speed is selected substantially between 1200 and 1800 revolutions per minute, in particular between 1300 and 1700 revolutions per minute.
  • the average speed is selected substantially between 1500 and 2000 revolutions per minute, in particular between 1700 and 2300 revolutions per minute. This allows an energy-efficient operation of the circulation pump at the same time reduced noise emission, since the speed of the correspondingly reduced amount of liquid in the water-bearing household appliance is adjusted, so as to ensure that no air bubbles are sucked by the circulation pump, which has an undesirable noise.
  • the drain pump and the circulation pump are controlled by a power electronics of the control electronics. That is, it is only a power electronics provided, which is used alternately to control the lye and circulation pump. Thus, a power electronics can be saved, which reduces the component requirements.
  • the power electronics may, for example, be designed to control pump motors designed as BLDC motors.
  • a water-conducting household appliance in particular a domestic dishwasher, at least comprising a drain pump with which at least temporarily water from the water-conducting household appliance can be conveyed and at least comprising a circulating pump, is circulated with the liquid in the water-conducting household appliance, and with control means for driving the drain pump and the circulation pump, wherein according to the invention it is provided that the control means are designed for substantially pressure shock-free lowering the speed of the circulating pump from a maximum speed to at least a minimum speed before the start of the drain pump.
  • a water-conducting household appliance embodied as a domestic dishwasher GS in the present exemplary embodiment has an interior space IR serving as a washing container, which can be opened or closed for loading and unloading by means of a door (not shown) pivotably hinged to the household dishwasher GS.
  • a door (not shown) pivotably hinged to the household dishwasher GS.
  • baskets GK are provided for receiving items to be cleaned, which can be pulled out of the interior IR of the household dishwasher GS to facilitate loading and unloading.
  • sprayers are provided in the interior IR of the household dishwasher GS as spraying arms SA applied to liquid with liquid, which may be, for example, with detergents or with rinse aid added water so as to effect a cleaning effect or streak-free drying of the items to be washed.
  • liquid which may be, for example, with detergents or with rinse aid added water so as to effect a cleaning effect or streak-free drying of the items to be washed.
  • the liquid flowing down from the items to be washed collects in a pump sump PS, which is arranged in the bottom area of the interior IR of the domestic dishwasher GS.
  • a filter device (not shown) is provided, with the dirt or particles can be separated from the circulating liquid.
  • the spray arms SA are fluidly connected via a supply line ZL with a circulation pump UP, which is arranged in a floor assembly BO below the interior IR of the household dishwasher GS next to other components of the household dishwasher GS.
  • a circulation pump UP In operation, i. when the circulation pump UP is running, the circulation pump UP sucks the liquid accumulating in the pump sump PS and delivers it through the supply line ZL to the spray arms SA.
  • the circulation pump UP in the present exemplary embodiment has an integrated water heater WZ for heating the liquid. Alternatively, a separate instantaneous water heater or another water heater may be provided for heating the liquid.
  • a drain pump LP is provided, which is also in liquid-conducting connection with the pump sump PS and can be connected to a disposal line EL to a home-side disposal network.
  • control electronics SE designed as control means, which are formed by means of conduit (not shown) for driving the circulating pump and the drain pump LP.
  • the control electronics SE can be designed to control drive motors, designed as BLDC motors, of the circulation pump UP and drain pump LP.
  • a corresponding power electronics may be provided for each of the pumps or only one power electronics for both pumps, so that a power electronics for alternating activation of the drain pump LP or the circulation pump UP can be used.
  • FIGS. 1 and 2 taken together.
  • the speed of the circulation pump UP is reduced from a maximum speed nMax linear during a first scrap I from the time t0 starting to the time t1 to a minimum speed nMin.
  • the rotational speed of nMin is reduced to zero, ie the circulation pump is stopped. This ensures that there can be no detachment and no flooding of a filter cake on the filter device, since the amount of liquid flowing back can no longer reach a level approaching the filter device.
  • a first Abpumpvorgang AP1 which extends from the time t1 to the time t2 and during which, for example, a quantity of 0.5 to 3 liters is pumped out.
  • the first Abpumpphase AP1 only the drain pump LP is in operation, while the circulation pump UP is deactivated and therefore has the speed 0.
  • the drain pump LP is deactivated and the circulation pump UP is reactivated. It is operated for this purpose with a medium speed nUk.
  • the domestic dishwasher GS is operated in a lower basket washing operation, in which only the lower spray arm SA of the two spray arms SA is operated.
  • a step III for filter cleaning the rotational speed of the circulation pump UP is linearly reduced from the average speed nUk to the minimum speed nMin.
  • the rotational speed at time t3 is then reduced from the minimum rotational speed nMin to 0, ie the circulation pump UP is stopped.
  • a second Abpumpphase AP2 which extends from the time t3 to the time t4 and during which by sole operation of the drain pump LP a residual amount of water is conveyed from the domestic dishwasher GS, this second amount of liquid is less than the first amount of liquid, which was pumped out of the water-bearing household appliance during the first pumping-down phase AP1.

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

Description

Die Erfindung betrifft ein Verfahren zum Abpumpen einer Flüssigkeit aus einem wasserführenden Haushaltsgerät, insbesondere aus einer Haushalts-Geschirrspülmaschine, nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for pumping out a liquid from a water-conducting domestic appliance, in particular from a household dishwasher, according to the preamble of patent claim 1.

Wasserführende Haushaltsgeräte, wie beispielsweise Haushalts-Geschirrspülmaschinen, weisen eine Umwälzpumpe auf, mit der Flüssigkeit umgewälzt wird, um sie Sprüheinrichtungen, wie z.B. rotierenden Sprüharmen zuzuführen, mit denen zu reinigendes Spülgut mit Flüssigkeit beaufschlagt werden kann. Um die Flüssigkeit nach Abschluss eines derartigen Reinigungsvorgangs aus dem wasserführenden Haushaltsgerät zu fördern, ist eine Laugenpumpe vorgesehen, die an ein hausseitiges Abwasserentsorgungssystem anschließbar ist. Hierzu wird neben der Laugenpumpe wenigstens zeitweise parallel die Umwälzpumpe betrieben, d.h. es findet ein zeitgleicher Betrieb beider Pumpen statt. Hierdurch wird sichergestellt, dass durch ein abruptes Anhalten der Umwälzpumpe vermieden wird, dass es zu einer Umkehrströmung in Kanälen kommt, die die Umwälzpumpe mit den Sprüheinrichtungen zum Besprühen von zu reinigendem Spülgut verbinden, was bewirken kann, dass durch die zurückströmenden Flüssigkeitsmengen der im Betrieb sich bildende Filterkuchen auf Filtereinrichtungen zum Abscheiden von Schmutz und Partikeln wieder aufgelöst und aufgeschwemmt wird mit der Folge, dass die abgeschiedenen Partikel und Schmutzteilchen wieder in den Umwälzkreislauf zur Versorgung der Sprüheinrichtungen gelangen und damit das Spülgut wieder-anschmutzen.Domestic water appliances, such as domestic dishwashers, include a recirculating pump for circulating liquid to allow them to spray such as e.g. supply rotating spray arms, which can be applied to be cleaned dishes with liquid. In order to promote the liquid after completion of such a cleaning process from the water-conducting household appliance, a drain pump is provided which can be connected to a house-side sewage disposal system. For this purpose, in addition to the drain pump, at least temporarily, the circulating pump is operated in parallel, i. There is a simultaneous operation of both pumps instead. This will ensure that an abrupt stop of the recirculation pump prevents a reverse flow from occurring in channels connecting the recirculation pump to the spraying equipment for spraying items to be cleaned, which may cause the liquid to flow back through the liquid during operation forming filter cake on filter devices for the separation of dirt and particles is redissolved and suspended, with the result that the separated particles and dirt particles get back into the circulation to supply the spraying and thus re-pollute the dishes.

Beispielsweise sei in diesem Zusammenhang auf die EP 1 882 438 A1 verwiesen, die eine entsprechende Haushaltsgesrhirrspülmaschine offenbart. Um eine effektive Reinigung der Filter zu gewährleisten, wird vorgeschlagen, dass die Entleerung der Spülflüssigkeit bei wenigstens anfangs laufender Umwälzpumpe erfolgt. Hierbei sind jedoch wiederum sowohl die Umwälzpumpe als auch die Laugenpumpe in Betrieb, so dass die Lösung in einem erhöhten Energieverbrauch der Anlage resultiert.For example, in this context, the EP 1 882 438 A1 referenced, which discloses a corresponding Haushaltsgesrhirrspülmaschine. In order to ensure effective cleaning of the filter, it is proposed that the emptying of the washing liquid takes place at least initially running circulation pump. Here again, however, both the circulation pump and the drain pump are in operation, so that the solution results in increased energy consumption of the system.

Es ist daher Aufgabe der Erfindung, technische Alternativen aufzuzeigen, mit denen eine derartige Rückanschmutzung von Spolgut zuverlässig verhindert werden kann. Die Aufgabe der Erfindung geht aus von einem Verfahren zum Abpumpen einer Flüssigkeit aus einem wasserführenden Haushaltsgerät, insbesondere einer Haushalts-Geschirrspülmaschine, während dem wenigstens zeitweise Wasser zum Betreiben einer Laugenpumpe aus dem wasserführenden Haushaltsgerät gefördert wird und wenigstens Wasser zeitweise zum Betreiben einer Umwälzpumpe umgewälzt wird.It is therefore an object of the invention to show technical alternatives with which such Rückanschmutzung of Spolgut can be reliably prevented. The object of the invention is based on a method for pumping out a liquid from a water-conducting household appliance, in particular a domestic dishwasher, during which at least temporarily water is conveyed for operating a drain pump from the water-conducting household appliance and at least water is temporarily circulated to operate a circulating pump.

Erfindungsgemäß ist vorgesehen, dass die Drehzahl der Umwälzpumpe vor der Inbetriebnahme der Laugenpumpe im Wesentlichen druckstoßfrei von einer Maximaldrehzahl wenigstens bis auf eine Minimaldrehzahl abgesenkt wird. Dies erlaubt auf überraschend einfache Weise, eine Rückanschmutzung zu verhindern, da durch eine kontinuierliche Reduzierung der Drehzahl der Umwälzpumpe vor Inbetriebnahme der Laugenpumpe das Flüssigkeitsniveau soweit abgesenkt werden kann, dass keine Ablösung des Filterkuchens durch zurückströmende Flüssigkeitsmengen erfolgen kann, da kein Strömungsumkehr verursachender Druckstoß entstehen kann, der einen Filterkuchen von einer Filtereinrichtung lösen könnte.According to the invention it is provided that the rotational speed of the circulating pump is lowered before start-up of the drain pump substantially pressure surge free of a maximum speed at least up to a minimum speed. This allows in a surprisingly simple way to prevent Rückanschmutzung, as by a continuous reduction in the speed of the circulation pump before commissioning the drain pump, the liquid level can be lowered so far that no detachment of the filter cake can be done by flowing back liquid amounts, since no flow reversal causing pressure surge that could solve a filter cake from a filter device.

Dabei ist in einer Weiterbildung vorgesehen, dass die Drehzahl der Umwälzpumpe vor dem Betreiben der Laugenpumpe in wenigstens zwei Schritten reduziert wird.It is provided in a development that the rotational speed of the circulating pump is reduced before operating the drain pump in at least two steps.

In einer Weiterbildung ist vorgesehen, dass die Drehzahl der Umwälzpumpe in dem ersten Schritt vor der Inbetriebnahme der Laugenpumpe von einer Maximaldrehzahl auf eine Minimaldrehzahl reduziert wird. Dies ist eine besonders einfache Ausführungsform, die einen besonders geringen gerätetechnischen Aufwand erfordert.In a further development, it is provided that the rotational speed of the circulation pump is reduced in the first step before starting up the drain pump from a maximum speed to a minimum speed. This is a particularly simple embodiment, which requires a particularly low expenditure on equipment.

Dabei ist in einer Weiterbildung vorgesehen, dass in einem ersten Schritt die Drehzahl der Umwälzpumpe von der Maximaldrehzahl auf die Minimaldrehzahl wenigstens zeitweise linear reduziert wird, d.h. mit einer zeitlich konstanten Rate. Jedoch kann die Drehzahl der Umwälzpumpe von der Maximaldrehzahl auf die Minimaldrehzahl auch stufenförmig mit einer Vielzahl von Schritten oder einer Exponentialfunktion entsprechend reduziert werden.It is provided in a further development that in a first step, the speed of the circulation pump from the maximum speed to the minimum speed is reduced at least temporarily linear, i. at a constant rate over time. However, the number of revolutions of the circulation pump from the maximum speed to the minimum speed may also be reduced correspondingly stepwise with a plurality of steps or an exponential function.

Ferner ist in einer Weiterbildung vorgesehen, dass die Drehzahl der Umwälzpumpe im Wesentlichen in einer Zeitdauer von 3 bis 30 Sekunden, insbesondere in einerFurthermore, it is provided in a development that the rotational speed of the circulating pump substantially in a period of 3 to 30 seconds, in particular in one

Zeitdauer von 10 bis 15 Sekunden, von der Maximaldrehzahl auf die Minimaldrehzahl reduziert wird. Dies erlaubt es, eine Rückanschmutzung auszuschließen und zugleich die Zeitdauer eines Abpumpvorgangs nahezu unverändert zu lassen.Time of 10 to 15 seconds, is reduced from the maximum speed to the minimum speed. This makes it possible to exclude a Rückanschmutzung and at the same time to leave the duration of an Abpumpvorgangs almost unchanged.

In einer Weiterbildung ist vorgesehen, dass in einem zweiten Schritt die Drehzahl von der Minimaldrehzahl auf 0 reduziert wird. Das heißt, der Betrieb der Umwälzpumpe wird vollständig eingestellt. So kann die Zeitdauer des Abpumpvorgangs auf ein Minimum reduziert werden. Dabei ist in einer Weiterbildung vorgesehen, dass nach dem zweiten Schritt durch Betreiben der Laugenpumpe eine Flüssigkeitsmenge abgepumpt wird. Das heißt, es findet kein simultaner bzw. zeitgleicher Betrieb der Laugenpumpe und der Umwälzpumpe statt.In a further development, it is provided that in a second step, the speed is reduced from 0 to the minimum speed. That is, the operation of the circulation pump is completely stopped. Thus, the duration of the pumping process can be reduced to a minimum. It is provided in a development that after the second step by operating the drain pump, an amount of liquid is pumped out. That is, there is no simultaneous or simultaneous operation of the drain pump and the circulation pump instead.

Es ist dabei in einer Weiterbildung vorgesehen, dass eine Menge von im Wesentlichen zwischen 0,5 und 3 Litern, insbesondere zwischen 1 und 2 Litern, abgepumpt wird.It is provided in a development that an amount of substantially between 0.5 and 3 liters, in particular between 1 and 2 liters, is pumped.

Hierbei ist in einer Weiterbildung vorgesehen, dass nach Deaktivieren der Laugenpumpe die Umwälzpumpe betrieben wird. Das heißt, der Betrieb der Umwälzpumpe wird während des Abpumpvorgangs wenigstens einmal unterbrochen von einer Phase, während der ein Abpumpvorgang mit der Laugenpumpe durchgeführt wird.It is provided in a development that after deactivation of the drain pump, the circulation pump is operated. That is, the operation of the circulation pump is interrupted during the Abpumpvorgangs at least once of a phase during which an Abpumpvorgang is performed with the drain pump.

Es ist in einer Weiterbildung vorgesehen, dass die Umwälzpumpe wenigstens zeitweise mit einer Mitteldrehzahl betrieben wird, die zwischen der Maximaldrehzahl und der Minimaldrehzahl liegt, mit der die Umwälzpumpe betrieben wird. Somit werden insbesondere unerwünschte Geräuschemissionen durch das Fördern von Luft vermieden, da die Umwälzpumpe mit einer Drehzahl betrieben wird, die auf die verbleibende Restwassermenge im wasserführenden Haushaltsgerät abgestimmt ist.It is provided in a development that the circulating pump is at least temporarily operated at a medium speed, which is between the maximum speed and the minimum speed at which the circulation pump is operated. Thus, in particular unwanted noise emissions are avoided by conveying air, since the circulation pump is operated at a speed that is matched to the remaining amount of residual water in water-bearing household appliance.

Dabei ist in einer Weiterbildung vorgesehen, dass die Geschirrspülmaschine während des Betriebs mit der Mitteldrehzahl in einem Unterkorbsprühbetrieb betrieben wird. Das heißt, die Geschirrspülmaschine weist eine obere und eine untere Sprüheinrichtung auf, die je einem oberen und einem unteren Geschinicorb zugeordnet sind, wobei ein Betrieb möglich ist, bei dem entweder nur der Oberkorb mit der ihm zugeordneten Sprüheinrichtung oder der Unterkorb mit der ihm zugeordneten Sprüheinrichtung betrieben wird. Hierdurch wird sichergestellt, dass sich eventuelle Schmutzreste, die sich gelöst haben, wieder zur Filtereinrichtung befördert werden.It is provided in a development that the dishwasher is operated during operation with the medium speed in a lower basket spray. That is, the dishwasher has an upper and a lower spray, each associated with an upper and a lower Geschinicorb, with an operation is possible, in which either only the upper basket with its associated sprayer or the lower basket with its associated Sprayer is operated. This ensures that any residues of dirt that have come loose, are transported back to the filter device.

Dabei ist in einer Weiterbildung vorgesehen, dass die Umwälzpumpe im Wesentlichen für eine Zeitdauer zwischen 5 und 60 Sekunden, insbesondere zwischen 10 und 30 Sekunden, betrieben wird.It is provided in a development that the circulating pump is operated substantially for a period of time between 5 and 60 seconds, in particular between 10 and 30 seconds.

Ferner ist in einer Weiterbildung vorgesehen, dass die Drehzahl der Umwälzpumpe in wenigstens zwei Schritten reduziert wird, wenn nach Deaktivieren der Laugenpumpe die Umwälzpumpe betrieben wird. Hierdurch kann eine Reinigung der Filtereinrichtung bewirkt werden.Furthermore, it is provided in a development that the rotational speed of the circulating pump is reduced in at least two steps when the circulating pump is operated after deactivation of the drain pump. As a result, a cleaning of the filter device can be effected.

Dabei ist in einer Weiterbildung ebenfalls vorgesehen, die Drehzahl der Umwälzpumpe in einem ersten Schritt vor dem Betreiben der Laugenpumpe von der Mitteldrehzahl auf eine Minimaldrehzahl zu reduzieren, wobei in einer Weiterbildung die Drehzahl der Umwälzpumpe von der Mitteldrehzahl auf die Minimaldrehzahl wenigstens zeitweise reduziert wird. Es kann jedoch auch die Drehzahl der Umwälzpumpe von der Mitteldrehzahl auf die Minimaldrehzahl schrittweise mit einer Vielzahl von Schritten oder einer Exponentialfunktion entsprechend reduziert werden.It is also provided in a further development to reduce the speed of the circulation pump in a first step before operating the drain pump from the average speed to a minimum speed, wherein in a development, the speed of the circulation pump from the central speed to the minimum speed is at least temporarily reduced. However, the number of revolutions of the circulating pump from the center speed to the minimum speed may be gradually reduced by a plurality of steps or an exponential function.

In einer Weiterbildung ist vorgesehen, dass die Drehzahl der Umwälzpumpe im Wesentlichen in einer Zeitdauer von 3 bis 60 Sekunden, insbesondere in einer Zeitdauer von 8 bis 12 Sekunden, von der Maximaldrehzahl auf die Minimaldrehzahl reduziert wird.In a further development, it is provided that the rotational speed of the circulating pump is reduced from the maximum rotational speed to the minimum rotational speed essentially in a time duration of 3 to 60 seconds, in particular in a time duration of 8 to 12 seconds.

Ferner ist in einer Weiterbildung vorgesehen, in einem zweiten Schritt die Drehzahl von der Mitteldrehzahl auf 0 zu reduzieren, d.h. den zweiten Schritt durch Anhalten der Umwälzpumpe zu beenden.It is further provided in a development, in a second step to reduce the speed from the center speed to 0, i. to end the second step by stopping the circulation pump.

In einer Weiterbildung ist vorgesehen, dass nach dem zweiten Schritt durch Betreiben der Laugenpumpe eine zweite Flüssigkeitsmenge abgepumpt wird. Dabei ist die zweite Flüssigkeitsmenge geringer als die erste Flüssigkeitsmenge.In a further development, it is provided that, after the second step, a second quantity of liquid is pumped out by operating the drain pump. In this case, the second amount of liquid is less than the first amount of liquid.

In einer Weiterbildung ist vorgesehen, dass die Maximaldrehzahl im Wesentlichen zwischen 2000 und 3000 Umdrehungen pro Minute, insbesondere zwischen 2300 und 2700 pro Minute, gewählt ist. Dies erlaubt einen energieeffizienten Betrieb der Umwälzpumpe bei gleichzeitig reduzierter Geräuschemission.In a further development it is provided that the maximum speed substantially between 2000 and 3000 revolutions per minute, in particular between 2300 and 2700 per minute, is chosen. This allows an energy-efficient operation of the circulation pump with simultaneously reduced noise emission.

Ferner ist in einer Weiterbildung vorgesehen, dass die Minimaldrehzahl im Wesentlichen zwischen 1200 und 1800 Umdrehungen pro Minute, insbesondere zwischen 1300 und 1700 Umdrehungen pro Minute, gewählt ist.It is further provided in a development that the minimum speed is selected substantially between 1200 and 1800 revolutions per minute, in particular between 1300 and 1700 revolutions per minute.

Es ist in einer Weiterbildung vorgesehen, dass die Mitteldrehzahl im Wesentlichen zwischen 1500 und 2000 Umdrehungen pro Minute, insbesondere zwischen 1700 und 2300 Umdrehungen pro Minute, gewählt ist. Dies erlaubt einen energieeffizienten Betrieb der Umwälzpumpe bei zugleich reduzierter Geräuschemission, da die Drehzahl der entsprechend reduzierten Flüssigkeitsmenge im wasserführenden Haushaltsgerät angepasst wird, so dass sichergestellt ist, dass keine Luftblasen von der Umwälzpumpe angesaugt werden, was eine unerwünschte Geräuschentwicklung zur Folge hat.It is provided in a development that the average speed is selected substantially between 1500 and 2000 revolutions per minute, in particular between 1700 and 2300 revolutions per minute. This allows an energy-efficient operation of the circulation pump at the same time reduced noise emission, since the speed of the correspondingly reduced amount of liquid in the water-bearing household appliance is adjusted, so as to ensure that no air bubbles are sucked by the circulation pump, which has an undesirable noise.

Schließlich ist in einer Weiterbildung vorgesehen, dass die Laugenpumpe und die Umwälzpumpe mit einer Leistungselektronik der Steuerelektronik angesteuert werden. D.h., es ist lediglich eine Leistungselektronik vorgesehen, die abwechselnd zur Ansteuerung der Laugen- und Umwälzpumpe verwendet wird. So kann eine Leistungselektronik eingespart werden, was den Bauelementebedarf reduziert. Dabei kann die Leistungselektronik bspw. zur Ansteuerung von als BLDC-Motoren ausgebildeten Pumpenmotoren ausgebildet sein.Finally, it is provided in a development that the drain pump and the circulation pump are controlled by a power electronics of the control electronics. That is, it is only a power electronics provided, which is used alternately to control the lye and circulation pump. Thus, a power electronics can be saved, which reduces the component requirements. In this case, the power electronics may, for example, be designed to control pump motors designed as BLDC motors.

Ferner wird die Aufgabe der Erfindung gelöst durch ein wasserführendes Haushaltsgerät, insbesondere eine Haushalts-Geschirrspülmaschine, wenigstens aufweisend eine Laugenpumpe, mit der wenigstens zeitweise Wasser aus dem wasserführenden Haushaltsgerät förderbar ist und wenigstens aufweisend eine Umwälzpumpe, mit der Flüssigkeit in dem wasserführenden Haushaltsgerät umwälzbar ist, sowie mit Steuermitteln zum Ansteuern der Laugenpumpe und der Umwälzpumpe, wobei erfindungsgemäß vorgesehen ist, dass die Steuermittel zum im Wesentlichen druckstoßfreien Absenken der Drehzahl der Umwälzpumpe von einer Maximaldrehzahl bis auf wenigstens eine Minimaldrehzahl vor der Inbetriebnahme der Laugenpumpe ausgebildet sind.Furthermore, the object of the invention is achieved by a water-conducting household appliance, in particular a domestic dishwasher, at least comprising a drain pump with which at least temporarily water from the water-conducting household appliance can be conveyed and at least comprising a circulating pump, is circulated with the liquid in the water-conducting household appliance, and with control means for driving the drain pump and the circulation pump, wherein according to the invention it is provided that the control means are designed for substantially pressure shock-free lowering the speed of the circulating pump from a maximum speed to at least a minimum speed before the start of the drain pump.

Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Further developments of the invention are specified in the subclaims.

Im Folgenden wird die Erfindung anhand zweier Zeichnungen erläutert Es zeigen:

Fig. 1
eine schematische Darstellung eines wasserführenden Haushaltsgeräts,
Fig. 2
eine schematische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Verfahrens zum Abpumpen einer Flüssigkeit aus einem wasserführenden Haushaltsgerät.
The invention is explained below with reference to two drawings, in which:
Fig. 1
a schematic representation of a water-conducting household appliance,
Fig. 2
a schematic representation of an embodiment of a method according to the invention for pumping a liquid from a water-conducting household appliance.

Es wird zunächst auf die Figur 1 Bezug genommen.It will be initially on the FIG. 1 Referenced.

Ein im vorliegenden Ausführungsbeispiel als Haushalts-Geschirrspülmaschine GS ausgebildetes wasserführendes Haushaltsgerät weist einen als Spülbehälter dienenden Innenraum IR auf, der mittels einer an der Haushalts-Geschirrspülmaschine GS schwenkbar angelenkten Tür (nicht dargestellt) zum Beladen und Entladen geöffnet bzw. geschlossen werden kann. In dem Innenraum IR der Haushalts-Geschirrspülmaschine GS sind Geschirrkörbe GK zur Aufnahme von zu reinigendem Spülgut vorgesehen, die aus dem Innenraum IR der Haushalts-Geschirrspülmaschine GS herausgezogen werden können, um das Be- und Entladen zu erleichtern.A water-conducting household appliance embodied as a domestic dishwasher GS in the present exemplary embodiment has an interior space IR serving as a washing container, which can be opened or closed for loading and unloading by means of a door (not shown) pivotably hinged to the household dishwasher GS. In the interior IR of the domestic dishwasher GS baskets GK are provided for receiving items to be cleaned, which can be pulled out of the interior IR of the household dishwasher GS to facilitate loading and unloading.

Um das in den Geschirrkörben GK gelagerte Spülgut zu reinigen sind in dem Innenraum IR der Haushalts-Geschirrspülmaschine GS als Sprüharme SA ausgebildete Sprüheinrichtungen zur Beaufschlagung von Spülgut mit Flüssigkeit vorgesehen, wobei es sich bei der Flüssigkeit um z.B. mit Reinigungsmitteln oder mit Klarspüler versetztes Wasser handeln kann, um so eine Reinigungswirkung bzw. streifenfreie Trocknung des Spülguts zu bewirken. Die vom Spülgut herabfließende Flüssigkeit versammelt sich in einem Pumpensumpf PS, der im Bodenbereich des Innenraums IR der Haushalts-Geschirrspülmaschine GS angeordnet ist. In dem Pumpensumpf PS ist ferner eine Filtereinrichtung (nicht dargestellt) vorgesehen, mit dem Schmutz oder Partikel aus der umgewälzten Flüssigkeit abgetrennt werden können.In order to clean the items to be stored in the dishwashing baskets GK sprayers are provided in the interior IR of the household dishwasher GS as spraying arms SA applied to liquid with liquid, which may be, for example, with detergents or with rinse aid added water so as to effect a cleaning effect or streak-free drying of the items to be washed. The liquid flowing down from the items to be washed collects in a pump sump PS, which is arranged in the bottom area of the interior IR of the domestic dishwasher GS. In the pump sump PS also a filter device (not shown) is provided, with the dirt or particles can be separated from the circulating liquid.

Die Sprüharme SA sind über eine Zuführleitung ZL mit einer Umwälzpumpe UP flüssigkeitsleitend verbunden, die neben anderen Bauteilkomponenten der Haushalts-Geschirrspülmaschine GS in einer Bodenbaugruppe BO unterhalb des Innenraums IR der Haushalts-Geschirrspülmaschine GS angeordnet ist. Im Betrieb, d.h. bei laufender Umwälzpumpe UP, saugt die Umwälzpumpe UP die sich in dem Pumpensumpf PS ansammelnde Flüssigkeit an und fördert diese durch die Zuführleitung ZL zu den Sprüharmen SA. Um die durch den Betrieb der Umwälzpumpe UP umgewälzte Flüssigkeit zu erwärmen, weist die Umwälzpumpe UP im vorliegenden Ausführungsbeispiel eine integrierte Wasserheizung WZ zur Erwärmung der Flüssigkeit auf. Alternativ kann zur Erwärmung der Flüssigkeit ein separater Durchlauferhitzer oder eine andere Wasserheizung vorgesehen sein. Zum Entleeren des Innenraums IR der Haushalts-Geschirrspülmaschine GS ist eine Laugenpumpe LP vorgesehen, die ebenfalls in flüssigkeitsleitender Verbindung mit dem Pumpensumpf PS steht und mit einer Entsorgungsleitung EL an ein hausseitiges Entsorgungsnetz angeschlossen werden kann.The spray arms SA are fluidly connected via a supply line ZL with a circulation pump UP, which is arranged in a floor assembly BO below the interior IR of the household dishwasher GS next to other components of the household dishwasher GS. In operation, i. when the circulation pump UP is running, the circulation pump UP sucks the liquid accumulating in the pump sump PS and delivers it through the supply line ZL to the spray arms SA. In order to heat the liquid circulated by the operation of the circulation pump UP, the circulation pump UP in the present exemplary embodiment has an integrated water heater WZ for heating the liquid. Alternatively, a separate instantaneous water heater or another water heater may be provided for heating the liquid. For emptying the interior IR of the domestic dishwasher GS a drain pump LP is provided, which is also in liquid-conducting connection with the pump sump PS and can be connected to a disposal line EL to a home-side disposal network.

Ferner weist die Haushalts-Gesmirrspülmaschine GS als Steuerelektronik SE ausgebildete Steuermittel auf, die mittels Leitungsmittel (nicht dargestellt) zum Ansteuern der Umwälzpumpe und der Laugenpumpe LP ausgebildet sind. Hierzu kann die Steuerelektronik SE zur Ansteuerung von als BLDC-Motoren ausgebildeten Antriebsmotoren der Umwälzpumpe UP und Laugenpumpe LP ausgebildet sein. Eine entsprechende Leistungselektronik (nicht dargestellt) kann für jede der Pumpen vorgesehen sein oder nur eine Leistungselektronik für beide Pumpen, so dass die eine Leistungselektronik zur alternierenden Ansteuerung der Laugenpumpe LP oder der Umwälzpumpe UP verwendet werden kann.Furthermore, the household dishwasher GS has control electronics SE designed as control means, which are formed by means of conduit (not shown) for driving the circulating pump and the drain pump LP. For this purpose, the control electronics SE can be designed to control drive motors, designed as BLDC motors, of the circulation pump UP and drain pump LP. A corresponding power electronics (not shown) may be provided for each of the pumps or only one power electronics for both pumps, so that a power electronics for alternating activation of the drain pump LP or the circulation pump UP can be used.

Es wird nun auf die Figuren 1 und 2 zusammen Bezug genommen.It will now be on the FIGS. 1 and 2 taken together.

Zu Beginn des Abpumpvorganges wird die Drehzahl der Umwälzpumpe UP von einer Maximaldrehzahl nMax linear während eines ersten Schrotts I vom Zeitpunkt t0 ausgehend bis zum Zeitpunkt t1 auf eine Minimaldrehzahl nMin reduziert. Anschließend wird in einem Schritt II die Drehzahl von nMin auf Null reduziert, d.h. die Umwälzpumpe angehalten. Hierdurch wird erreicht, dass es zu keiner Ablösung und keinem Aufschwemmen eines Filterkuchens auf der Filtereinrichtung kommen kann, da die zurückströmende Flüssigkeitsmenge nicht mehr ein an die Filtereinrichtung heranreichendes Niveau erreichen kann.At the beginning of the Abpumpvorganges the speed of the circulation pump UP is reduced from a maximum speed nMax linear during a first scrap I from the time t0 starting to the time t1 to a minimum speed nMin. Subsequently, in a step II, the rotational speed of nMin is reduced to zero, ie the circulation pump is stopped. This ensures that there can be no detachment and no flooding of a filter cake on the filter device, since the amount of liquid flowing back can no longer reach a level approaching the filter device.

Anschließend erfolgt ein erster Abpumpvorgang AP1, der sich von dem Zeitpunkt t1 bis zu dem Zeitpunkt t2 erstreckt und während dem beispielsweise eine Menge von 0,5 bis 3 Litern abgepumpt wird. Während der ersten Abpumpphase AP1 ist nur die Laugenpumpe LP in Betrieb, während die Umwälzpumpe UP deaktiviert ist und daher die Drehzahl 0 aufweist.Subsequently, a first Abpumpvorgang AP1, which extends from the time t1 to the time t2 and during which, for example, a quantity of 0.5 to 3 liters is pumped out. During the first Abpumpphase AP1 only the drain pump LP is in operation, while the circulation pump UP is deactivated and therefore has the speed 0.

Anschließend wird nach Beendigung der ersten Abpumpphase AP1 die Laugenpumpe LP deaktiviert und die Umwälzpumpe UP wieder aktiviert. Sie wird hierzu mit einer Mitteldrehzahl nUk betrieben. Zugleich wird die Haushalts-Geschirrspülmaschine GS in einem Unterkorbspülbetrieb betrieben, bei dem nur der untere Sprüharm SA der beiden Sprüharme SA betrieben wird.Subsequently, after completion of the first pumping out phase AP1, the drain pump LP is deactivated and the circulation pump UP is reactivated. It is operated for this purpose with a medium speed nUk. At the same time, the domestic dishwasher GS is operated in a lower basket washing operation, in which only the lower spray arm SA of the two spray arms SA is operated.

Anschließend wird in einem Schritt III zur Filterreinigung die Drehzahl der Umwälzpumpe UP von der Mitteldrehzahl nUk auf die Minimaldrehzahl nMin linear reduziert. In einem weiteren Schritt IV wird dann die Drehzahl am Zeitpunkt t3 von der Minimaldrehzahl nMin auf 0 reduziert, d.h. die Umwälzpumpe UP wird angehalten.Subsequently, in a step III for filter cleaning, the rotational speed of the circulation pump UP is linearly reduced from the average speed nUk to the minimum speed nMin. In a further step IV, the rotational speed at time t3 is then reduced from the minimum rotational speed nMin to 0, ie the circulation pump UP is stopped.

Es schließt sich eine zweite Abpumpphase AP2 an, die sich vom Zeitpunkt t3 bis zum Zeitpunkt t4 erstreckt und während dem durch alleinigen Betrieb der Laugenpumpe LP eine Restwassermenge aus der Haushalts-Geschirrspülmaschine GS gefördert wird, wobei diese zweite Flüssigkeitsmenge geringer als die erste Flüssigkeitsmenge ist, die während der ersten Abpumpphase AP1 aus dem wasserführenden Haushaltsgeät gefördert wurde.It is followed by a second Abpumpphase AP2, which extends from the time t3 to the time t4 and during which by sole operation of the drain pump LP a residual amount of water is conveyed from the domestic dishwasher GS, this second amount of liquid is less than the first amount of liquid, which was pumped out of the water-bearing household appliance during the first pumping-down phase AP1.

Anschließend steht die Haushalts-Geschirrspülmaschine GS für eine Neubefüllung bereit.Then the household dishwasher GS is ready for refilling.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

BOBO
Bodenbaugruppebottom assembly
ELEL
Entsorgungsleitungdisposal line
GKGK
Geschirrkorbdish rack
GSGS
Haushalts-GeschirrspülmaschineDomestic dishwasher
IRIR
Innenrauminner space
LPLP
LaugenpumpeDrain pump
PSPS
Pumpensumpfsump
SASA
Sprüharmspray arm
t0t0
Zeitpunkttime
t1t1
Zeitpunkttime
t2t2
Zeitpunkttime
t3t3
Zeitpunkttime
t4t4
Zeitpunkttime
UPUP
Umwälzpumpecirculating pump
ZLZL
Zuführleitungfeed
AP1AP1
erste Abpumpphasefirst pumping phase
AP2AP2
zweite Abpumphasesecond pumping phase
nMaxnMax
MaximaldrehzahlMaximum speed
nMinnMin
MinimaldrehzahlMinimum speed
nUkNUK
MitteldrehzahlMedium Speed
SESE
Steuerelektronikcontrol electronics
WZWZ
Wasserheizungwater Heating

Claims (44)

  1. Method for pumping fluid out of an aquiferous household device, in particular out of a household dishwashing machine (GS), wherein water is conveyed out of the aquiferous household device at least temporarily by the operation of a drain pump (LP) and water is circulated at least temporarily by the operation of a circulation pump (UP), characterised in that the speed of the circulation pump (UP) is lowered from a maximum speed (nMax) at least to a minimum speed (nMin) before start-up of the drain pump (LP) essentially without pressure surges.
  2. Method according to claim 1, characterised in that the speed of the circulation pump (UP) is reduced in at least two steps (I, II) before operation of the drain pump (LP).
  3. Method according to claim 2, characterised in that the speed of the circulation pump (UP) is reduced at least temporarily in a linear manner in a first step (I).
  4. Method according to at least one of claims 1 or 3, characterised in that the speed of the circulation pump (UP) is reduced from a maximum speed (nMax) to the minimum speed (nMin) essentially in a time period from 3 to 30 seconds, in particular in a time period from 10 to 15 seconds.
  5. Method according to at least one of claims 2 to 4, characterised in that the speed is reduced from the minimum speed (nMin) to 0 in the second step (II).
  6. Method according to at least one of claims 2 to 5, characterised in that a quantity of fluid is pumped out after the second step (II) by operation of the drain pump (LP).
  7. Method according to claim 6, characterised in that a quantity of essentially between 0.5 and 3 litres, in particular between 1 and 2 litres, is pumped out.
  8. Method according to claim 6 or 7, characterised in that the circulation pump (UP) is operated after deactivation of the drain pump (LP).
  9. Method according to claim 8, characterised in that the circulation pump (UP) is operated at least temporarily with an average speed (nUk), which is between the maximum speed (nMax) and the minimum speed (nMin).
  10. Method according to claim 9, characterised in that the aquiferous household device is operated during operation with the average speed (nUk) in a lower basket wash cycle.
  11. Method according to claim 9 or 10, characterised in that the circulation pump (UP) is operated essentially for a time period of between 5 and 60 seconds, in particular between 10 and 30 seconds.
  12. Method according to at least one of claims 8 to 11, characterised in that the speed of the circulation pump (UP) is reduced in at least two steps (III, IV).
  13. Method according to claim 12, characterised in that the speed of the circulation pump (UP) is reduced from the average speed (nUk) to a minimum speed (nMin) in a first step (III) before operation of the drain pump (LP).
  14. Method according to claim 13, characterised in that the speed of the circulation pump (UP) is reduced at least temporarily in a linear manner from the average speed (nUk) to the minimum speed (nMin).
  15. Method according to claim 13 or 14, characterised in that the speed of the circulation pump (UP) is reduced from the maximum speed (nMax) to the minimum speed (nMin) essentially in a time period from 3 to 30 seconds, in particular in a time period from 8 to 12 seconds.
  16. Method according to at least one of claims 12 to 15, characterised in that the speed is reduced from the average speed (nUk) to 0 in a second step (IV).
  17. Method according to at least one of claims 12 to 16, characterised in that a second quantity of fluid is pumped out after the second step (IV) by operation of the drain pump (LP).
  18. Method according to claim 17, characterised in that the second quantity of fluid is equal to or less than the first quantity of fluid.
  19. Method according to at least one of claims 1 to 18, characterised in that the maximum speed (nMax) is essentially between 2000 and 3000 revolutions per minute, in particular between 2300 and 2700 revolutions per minute.
  20. Method according to at least one of claims 1 to 19, characterised in that the minimum speed (nMin) is essentially between 1200 and 1800 revolutions per minute, in particular between 1300 and 1700 revolutions per minute.
  21. Method according to at least one of claims 9 to 20, characterised in that the average speed (nUk) is essentially between 1500 and 2000 revolutions per minute, in particular between 1700 and 2300 revolutions per minute.
  22. Method according to at least one of claims 1 to 21, characterised in that the drain pump (LP) and the circulation pump (UP) are controlled using an electronic power system of the electronic control system (SE).
  23. Aquiferous household device, in particular a household dishwashing machine (GS), at least comprising a drain pump (LP) with which water can be conveyed at least temporarily out of the aquiferous household device, and at least comprising a circulation pump (UP) with which fluid can be circulated in the aquiferous household device, and having control means (SE) for controlling the drain pump (LP) and the circulation pump (UP), characterised in that the control means (SE) are embodied to lower the speed of the circulation pump (UP) from a maximum speed (nMax) to at least a minimum speed (nMin) before start-up of the drain pump (LP) essentially without pressure surges.
  24. Aquiferous household device according to claim 23, characterised in that the control means (SE) are embodied to reduce the speed of the circulation pump (UP) in at least two steps (I, II).
  25. Aquiferous household device according to claim 24, characterised in that the control means (SE) are embodied to reduce the speed of the circulation pump (UP) in a linear manner in the first step (I).
  26. Aquiferous household device according to claim 24 or 25, characterised in that the speed of the circulation pump (UP) can be reduced from the maximum speed (nMax) to the minimum speed (nMin) essentially in a time period from 3 to 30 seconds, in particular in a time period from 10 to 15 seconds,.
  27. Aquiferous household device according to at least one of claims 24 to 26, characterised in that the control means (SE) are embodied to reduce the speed from the minimum speed (nMin) to 0 in a second step (II).
  28. Aquiferous household device according to at least one of claims 24 to 27, characterised in that the control means (SE) are embodied to pump a quantity of fluid out after the second step (II) by operation of the drain pump (LP).
  29. Aquiferous household device according to claim 28, characterised in that a quantity of essentially between 0.5 and 3 litres, in particular between 1 and 2 litres, can be pumped out.
  30. Aquiferous household device according to claim 28 or 29, characterised in that the drain pump (LP) can be operated after deactivation of the circulation pump (UP).
  31. Aquiferous household device according to claim 30, characterised in that the drain pump (LP) can be operated at least temporarily with an average speed (nUk), which is between the maximum speed (nMax) and the minimum speed (nMin).
  32. Aquiferous household device according to claim 31, characterised in that the aquiferous household device (GS) can be operated during operation with the average speed (nUk) in a lower basket wash cycle.
  33. Aquiferous household device according to claim 31 or 32, characterised in that the circulation pump (UP) can be operated essentially for a time period of between 5 and 60 seconds, in particular between 10 and 30 seconds.
  34. Aquiferous household device according to at least one of claims 30 to 33, characterised in that the control means (SE) are embodied to reduce the speed of the circulation pump (UP) in at least two steps (III, IV).
  35. Aquiferous household device according to claim 34, characterised in that the control means (SE) are embodied to reduce the speed of the circulation pump (LP) from the average speed (nUk) to a minimum speed (nMin) in a first step (III) before operation of the drain pump (LP).
  36. Aquiferous household device according to claim 35, characterised in that the control means (SE) are embodied to reduce the speed of the circulation pump (UP) at least temporarily in a linear manner from the average speed (nUk) to the minimum speed (nMin).
  37. Aquiferous household device according to claim 35 or 36, characterised in that the speed of the circulation pump (UP) can be reduced from the maximum speed (nMax) to the minimum speed (nMin) essentially in a time period from 3 to 30 seconds, in particular in a time period from 8 to 12 seconds.
  38. Aquiferous household device according to at least one of claims 34 to 37, characterised in that the control means (SE) are embodied to reduce the speed from the average speed (nUk) to 0 in a second step (IV).
  39. Aquiferous household device according to at least one of claims 34 to 38, characterised in that a second quantity of fluid can be pumped out after the second step (IV) by operation of the drain pump (LP).
  40. Aquiferous household device according to claim 39, characterised in that the second quantity of fluid is equal to or less than the first quantity of fluid.
  41. Aquiferous household device according to at least one of claims 23 to 40, characterised in that the circulation pump (UP) can be operated with a maximum speed (nMax), which is essentially between 2000 and 3000 revolutions per minute, in particular between 2300 and 2700 revolutions per minute.
  42. Aquiferous household device according to at least one of claims 23 to 41, characterised in that the circulation pump (UP) can be operated with a minimum speed (nMin), which is essentially between 1200 and 1800 revolutions per minute, in particular between 1300 and 1700 revolutions per minute.
  43. Aquiferous household device according to at least one of claims 31 to 42, characterised in that the circulation pump (UP) can be operated with an average speed (nUk), which is essentially between 1500 and 2000 revolutions per minute, in particular between 1700 and 2300 revolutions per minute.
  44. Aquiferous household device according to at least one of claims 23 to 43, characterised in that the electronic control system (SE) comprises an electronic power system to control the drain pump (LP) and the circulation pump (UP).
EP09799572.4A 2008-12-19 2009-12-04 Method for pumping a fluid out of an aquiferous household device Active EP2381827B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09799572T PL2381827T3 (en) 2008-12-19 2009-12-04 Method for pumping a fluid out of an aquiferous household device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810055022 DE102008055022A1 (en) 2008-12-19 2008-12-19 A method for pumping a liquid from a water-conducting household appliance
PCT/EP2009/066402 WO2010079021A2 (en) 2008-12-19 2009-12-04 Method for pumping a fluid out of an aquiferous household device

Publications (2)

Publication Number Publication Date
EP2381827A2 EP2381827A2 (en) 2011-11-02
EP2381827B1 true EP2381827B1 (en) 2013-06-26

Family

ID=42193943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09799572.4A Active EP2381827B1 (en) 2008-12-19 2009-12-04 Method for pumping a fluid out of an aquiferous household device

Country Status (8)

Country Link
US (1) US9609996B2 (en)
EP (1) EP2381827B1 (en)
CN (1) CN102256527B (en)
DE (1) DE102008055022A1 (en)
ES (1) ES2420781T3 (en)
PL (1) PL2381827T3 (en)
RU (1) RU2515463C2 (en)
WO (1) WO2010079021A2 (en)

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Also Published As

Publication number Publication date
US9609996B2 (en) 2017-04-04
CN102256527A (en) 2011-11-23
EP2381827A2 (en) 2011-11-02
CN102256527B (en) 2014-03-26
WO2010079021A2 (en) 2010-07-15
DE102008055022A1 (en) 2010-06-24
RU2011125655A (en) 2013-01-27
PL2381827T3 (en) 2013-11-29
US20110232702A1 (en) 2011-09-29
ES2420781T3 (en) 2013-08-26
RU2515463C2 (en) 2014-05-10
WO2010079021A3 (en) 2010-10-14

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