EP2161365B1 - Method for operating a washing machine and washing machine - Google Patents

Method for operating a washing machine and washing machine Download PDF

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Publication number
EP2161365B1
EP2161365B1 EP09010893.7A EP09010893A EP2161365B1 EP 2161365 B1 EP2161365 B1 EP 2161365B1 EP 09010893 A EP09010893 A EP 09010893A EP 2161365 B1 EP2161365 B1 EP 2161365B1
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EP
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Prior art keywords
heating member
washing
washing liquid
switched
recirculation device
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EP09010893.7A
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German (de)
French (fr)
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EP2161365A3 (en
EP2161365A2 (en
Inventor
Peter Zinkann
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Miele und Cie KG
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Miele und Cie KG
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    • 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 
    • D06F39/04—Heating arrangements

Definitions

  • the invention relates to a method for operating a washing machine with a tub for holding washing liquid for treating laundry, a radiator and a Umflut issued, the method comprises a washing phase with activated radiator for heating the washing liquid and activated Umflut Vietnamese, the washing liquid from the lower Area of the tub in the upper area, based on the operational installation position of the washing machine promotes.
  • the laundry For washing laundry in a drum washing machine, the laundry is moved in the rotating drum, whereby the wetting of the laundry with the washing liquid and the washing mechanism are effected.
  • there is water in the tub or in the drum wherein the dirt is flushed out by the movement of the laundry.
  • Umflut In order to completely bring the wash lye in connection with the laundry, it is known to promote by means of a Umflut issued the washing liquid from the lower portion of the tub or from the drainage channel in the upper region, so that the laundry located in the drum from above Be sprinkled washing liquid. With simultaneous drum rotation a good mixing of the laundry with the washing liquid is achieved. Furthermore, by avoiding dead volume, good utilization of the water or of the detergent is achieved.
  • Such a method for operating such a washing machine is from the DE 34 01 899 A1 known.
  • water is added at the beginning of the washing phase with the addition of detergent in a room in the lower region of the tub, wherein the water or the laundry detergent added with washing does not come into contact with the laundry.
  • the liquor is heated within the room and thereby circulated.
  • the actual circulating device is activated, that is, the laundry is acted upon by the washing liquid.
  • an increased time is required compared to a normal washing phase, since the detergent dissolution is performed separately before the wetting section.
  • more washing liquid must be provided because the space below the tub takes up a significant portion of the free liquor.
  • the DE 10 2006 039 477 A1 discloses a method of controlling a circulation pump in a washing machine that is turned on overall depending on the activity of other consumers. This is intended to ensure that the amount of water admitted corresponds exactly to the desired quantity, since disturbing influences caused by the flooding are avoided when the amount of water is sensed. Furthermore, the circulating pump is not operated during heating, so that the hot wash water remains as long as possible in the tub to kill germs if necessary.
  • the DE 39 13 642 A1 generally discloses a water inlet in a washing machine controlled by a pressure switch.
  • the EP 1 502 986 A1 discloses a method for operating a washing machine with a flooding device, wherein during the flooding the amount of laundry is determined in conjunction with the water supply
  • the invention is therefore based on the object to provide a method with improved washing action or to optimize the known method in a simple manner and to provide a washing machine for performing the method.
  • the main advantage of the method according to the invention is that a simple way to improve the washing effect at about the same duration and amount of water, compared to a conventional washing phase without flooding is achieved. Elaborate constructional measures are not necessary here except for the simple circulating device, which can convey the washing liquid from the lower region of the tub into the upper region of the tub or into the drum.
  • the washing liquid is heated and the circulating device is activated.
  • the circulating device has a pipeline, which is guided from the lower region of the tub starting in the upper area and there, for example, opens by means of a mounted in the front door door.
  • a pump is interposed, which can promote the washing liquid accordingly.
  • the heating by means of the switched on radiator causes the substances of the detergent are optimally dissolved, which require a higher temperature than the water inlet temperature, for example 18 to 25 ° C.
  • the circulating device is activated in phases in the method according to the invention, wherein the radiator is switched off in the active phases of the circulating device.
  • the radiator is switched off in the active phases of the circulating device.
  • the radiator is turned on after completion of the period with activated Umflut Anlagen, and that the switching on and off of the radiator and the Umflut issued is repeated several times.
  • the resolution of the detergent within the washing liquid and thus the washing action is further improved.
  • the switching on of the radiator after switching off the Umflut takes place only after a delay time. This ensures that the flooded washing liquid from the lines of Umflut Roaden flows or swells from the laundry and collects again in the lower part of the tub, so as to ensure that the radiator is completely covered with washing liquid again when switching.
  • the turning on of the radiator after switching off the Umflut depends on the level of the washing liquid within the tub.
  • the delay time can be optimally adapted to the suction behavior or to the behavior of the laundry in terms of fluid intake and delivery. As a result, this delay time is shortened in a laundry with laundry items low absorbency, so that the entire heating slightly shortened.
  • the turning on of the radiator takes place only when the water level has exceeded a critical limit, with the critical limit of the radiator is so in communication with washing liquid that no overheating or damage to the radiator occurs.
  • the safety against overheating is further improved or the unwanted dry heating reliably avoided.
  • the turn-on time of the heater is in the range of 1 to 6 minutes and the activation time of the circulating device in the range of 30 seconds to 3 minutes. This ensures that the radiator can transmit a certain amount of heat in the washing liquid in the periods of heating. The shorter time periods for the activated flooding device ensure that the washing liquid does not cool too much, whereby a good moisture penetration or mixing of the laundry with the washing liquid is provided.
  • the delay time in the range of 5 to 30 seconds.
  • the activation of the circulating device is dependent on the level of the washing liquid in the tub, wherein when falling below a lower limit the Umflut issued is switched off or operated at a reduced flow rate. This avoids that the Umflut issued or the pump sucks air, which usually leads to increased operating noise. Furthermore, unnecessary operation of the flooding device is avoided, thereby reducing wear and energy consumption.
  • the washing liquid is formed by means of inlet water with the addition of at least one treatment agent.
  • the invention further relates to a washing machine with a tub for holding washing liquid for treating laundry, a horizontally rotatably mounted drum in the tub, a motor for rotating the drum, a radiator, a Umflut Vietnamese, a water inlet device and a control device for controlling the individual phases of the selected washing program, wherein the control device is configured to activate or deactivate or switch on or off the Umflut Vietnamese, the radiator and / or the water inlet device.
  • the washing machine comprises at least one sensor for detecting or determining the critical water level and / or the lower limit value, wherein the sensor is in communication with the control device.
  • a sensor for example, a pressure sensor can be used which is connected to an air trap on the tub in the lower region by means of a hose line.
  • conductance sensors may also be attached to the tub wall, which then provide a signal to the controller when covered by wash liquid.
  • Other sensors can also be used, wherein the control device is to be configured accordingly.
  • Fig. 1 is a purely schematic representation of a washing machine 1, shown with a tub 2.
  • the position and direction information refer to the operational installation position of the washing machine 1.
  • a rotatably mounted and driven by an electric motor 13 drum 3 is arranged, which moves the laundry items located in the tub 2 8.
  • the drum 3 is made in the present embodiment of stainless steel and provided with a plurality of openings for the flooding.
  • the housing 4 has a loading opening 9, via which the interior of the drum 3 can be reached through the sealing sleeve 6.
  • the loading opening 9 can be closed by means of a door 5.
  • a radiator 7 is arranged, which can heat the washing liquid in the tub.
  • an inlet valve 15 is sketched, which provides the running in of the water from the supply network.
  • the water is passed through the connecting pipe 14 into the tub 2, wherein in the dispenser 11 entered detergent is flushed into the tub 2.
  • a drain device 12 is arranged, which leads the spent washing liquid or the rinse water from the tub 2 to the drain line 12c, which usually opens into a sewer.
  • the control device 18 controls the inlet valve 15, the activity of the drain device 12, the drive motor 13, which is energized via the power unit or a frequency converter 16, and the radiator 7.
  • the control device 18 controls the inlet valve 15, the activity of the drain device 12, the drive motor 13, which is energized via the power unit or a frequency converter 16, and the radiator 7.
  • the pump 17a attached to a flooding device.
  • the pump 17a is connected to the drain pipe 12b on the inlet side and suction side, respectively, and can convey the washing liquid 19 therein through the pipe 17b into the upper portion of the tub 2 and the drum 3, respectively.
  • the washing liquid 19 is injected or flows onto the laundry items 8 through the nozzle or the outlet 17c.
  • Fig. 1 is also shown that the level of the washing liquid 19 is just below the maximum value Max. At the critical level Crit the heater 7 is just covered with washing liquid, so that no dry heating takes place. Below the minimum Level Min, there is a risk that the circulating pump 17a can no longer completely suck in liquid, so that it can lead to increased noise.
  • a complete sequence of a washing program WP is shown in a diagram.
  • the individual phases within the wash program WP are shown on the time axis t.
  • the program sequence WP shown here comprises a washing phase Wa, a rinsing phase Sp and a spinning phase Sc.
  • the radiator 7 and the Umflut Anlagen 17 are controlled accordingly to heat the washing liquid 19 to the predetermined temperature.
  • the water is introduced into the flushing device or the dispenser 11, whereby the processing agent stored therein, such as washing powder, is introduced through the connecting tube 14 into the tub 2.
  • the heating-up section Hz in which the washing liquid is heated by means of the activated heating element 7 to the temperature preset by the control device 18 by the selected program.
  • the washing liquid 19 cools.
  • the washing phase Wa is ended with the pumping, wherein the drain device 12, in particular the pump 12a or a drain valve is activated.
  • pumping can also be spun so that the scrubbing added with detergent washing liquid 19 is removed from the fabric of the laundry items 8.
  • the flushing section Sp in which fresh water is introduced into the tub and the items of laundry 8 are moved therein.
  • the rinse water is pumped out, followed by the final spin Sc for dewatering the laundry items 8.
  • the drum 3 is rotated at a higher speed compared with the washing process, in which the laundry items 8 abut the drum shell and the water or the washing liquid is thrown out of the fabric due to the centrifugal force out through the drum openings.
  • the drain device 12 is activated in this case, so that the liquid is removed from the tub 2.
  • Fig. 3a to 3d the control of the radiator 7 and the circulating device 17 according to the method of the invention is shown in a diagram.
  • the time points on the time axis t are given here only symbolically, in the real process, these markings correspond to a time unit.
  • the activity of the water inlet device 15 and the drum rotation are not taken into account, since it is of minor importance for the explanation of the method according to the invention.
  • the temperature Temp of the washing liquid rises according to Fig. 3a , in this example from about 20 ° C to about 40 ° C.
  • the flooding device 17 or the pump 17a is switched on ( Fig. 3c ) and the radiator 7 is switched off ( Fig. 3b ).
  • Fig. 3d It can be seen that the liquid level within the tub 2 is reduced from the maximum value Max. Once the liquid level reaches the minimum min, the pump 17a is turned off, otherwise there is a risk that the pump 17a runs dry or sucks in air, which would lead to undesirable noise.
  • the delay Vt ensures that the heating element 7 is not switched on until the liquid level has exceeded the critical limit value Krit ( Fig. 3d ).
  • the washing liquid 19 located in the channels 17b, 17c of the flooding device 17 and in the fabric of the laundry items 8 flows back into the lower region of the liquor container 2, so that the level of the free liquor again increases slightly ( Fig. 3d ).
  • the radiator 7 is turned on again, so that the predetermined temperature, here 60 ° C, is achieved for the washing liquid 19.
  • the predetermined temperature here 60 ° C
  • the circulating device 17 is operated continuously or depending on the level ( Fig. 3d ) are shut off when reaching the minimum level Min or operated at reduced capacity. Based on the temperature profile according to Fig. 3a it can be seen that the heating section extends slightly. Due to the advantageous detergent dissolution and the better moisture penetration of the laundry, the overall sequence of the washing program WP can be shortened, the amount of detergent can be reduced and / or the washing effect can be improved.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betreiben einer Waschmaschine mit einem Laugenbehälter zur Aufnahme von Waschflüssigkeit zum Behandeln von Wäsche, einem Heizkörper und einer Umfluteinrichtung, wobei das Verfahren eine Waschphase mit eingeschaltetem Heizkörper zum Erhitzen der Waschflüssigkeit und aktivierter Umfluteinrichtung umfasst, die die Waschflüssigkeit aus dem unteren Bereich des Laugenbehälters in den oberen Bereich, bezogen auf die betriebsgemäße Aufstellposition der Waschmaschine, fördert.The invention relates to a method for operating a washing machine with a tub for holding washing liquid for treating laundry, a radiator and a Umfluteinrichtung, the method comprises a washing phase with activated radiator for heating the washing liquid and activated Umfluteinrichtung, the washing liquid from the lower Area of the tub in the upper area, based on the operational installation position of the washing machine promotes.

Zum Waschen von Wäsche in einer Trommelwaschmaschine wird die Wäsche in der drehenden Trommel bewegt, wodurch die Benetzung bzw. Durchfeuchtung der Wäsche mit der Waschflüssigkeit und die Waschmechanik bewirkt werden. Hierbei befindet sich Wasser im Laugenbehälter bzw. in der Trommel, wobei durch die Bewegung der Wäsche der Schmutz ausgespült wird. Um die Waschlauge möglicht vollständig mit der Wäsche in Verbindung zu bringen, ist es bekannt, mittels einer Umfluteinrichtung die Waschflüssigkeit vom unteren Bereich des Laugenbehälters bzw. aus dem Ablaufkanal in den oberen Bereich zu fördern, so dass die in der Trommel befindlichen Wäschestücke von oben mit Waschflüssigkeit berieselt werden. Bei gleichzeitiger Trommeldrehung wird eine gute Durchmischung der Wäschestücke mit der Waschflüssigkeit erreicht. Ferner wird durch die Vermeidung von Totvolumen eine gute Ausnutzung des Wassers bzw. des Waschmittels erreicht. Ein derartiges Verfahren zum Betreiben einer solchen Waschmaschine ist aus der DE 34 01 899 A1 bekannt. Hierbei wird zu Beginn der Waschphase Wasser unter Zugabe von Waschmittel in einen Raum im unteren Bereich des Laugenbehälters eingelassen, wobei das Wasser bzw. die mit Waschmittel versetzte Waschflüssigkeit noch nicht mit der Wäsche in Berührung kommt. Danach wird die Lauge innerhalb des Raumes aufgeheizt und dabei umgewälzt. Nachdem das Waschmittel aufgelöst ist und die mit dem Waschmittel versetzte Waschflüssigkeit die vorgegeben Temperatur erreicht hat, wird die eigentliche Umfluteinrichtung aktiviert, das heißt, die Wäsche wird mit der Waschflüssigkeit beaufschlagt. Hierbei ist es aufwändig, dass eine Mehrzahl von Kanälen und steuerbaren Ventilen notwendig sind, damit das entsprechende Verfahren durchgeführt werden kann. Ferner ist ein erhöhter Zeitbedarf gegenüber einer normalen Waschphase festzustellen, da das Waschmittelauflösen separat vor dem Benetzungsabschnitt durchgeführt wird. Ferner muss mehr Waschflüssigkeit zur Verfügung gestellt werden, da der Raum unterhalb des Laugenbehälters einen erheblichen Teil der freien Flotte aufnimmt.For washing laundry in a drum washing machine, the laundry is moved in the rotating drum, whereby the wetting of the laundry with the washing liquid and the washing mechanism are effected. In this case, there is water in the tub or in the drum, wherein the dirt is flushed out by the movement of the laundry. In order to completely bring the wash lye in connection with the laundry, it is known to promote by means of a Umfluteinrichtung the washing liquid from the lower portion of the tub or from the drainage channel in the upper region, so that the laundry located in the drum from above Be sprinkled washing liquid. With simultaneous drum rotation a good mixing of the laundry with the washing liquid is achieved. Furthermore, by avoiding dead volume, good utilization of the water or of the detergent is achieved. Such a method for operating such a washing machine is from the DE 34 01 899 A1 known. Here, water is added at the beginning of the washing phase with the addition of detergent in a room in the lower region of the tub, wherein the water or the laundry detergent added with washing does not come into contact with the laundry. Thereafter, the liquor is heated within the room and thereby circulated. After the detergent is dissolved and the detergent added with the washing liquid has reached the predetermined temperature, the actual circulating device is activated, that is, the laundry is acted upon by the washing liquid. In this case, it is complicated that a plurality of channels and controllable valves are necessary for the corresponding method to be carried out. Furthermore, an increased time is required compared to a normal washing phase, since the detergent dissolution is performed separately before the wetting section. Furthermore, more washing liquid must be provided because the space below the tub takes up a significant portion of the free liquor.

Aus der GB 2 204 328 A ist es ferner bekannt, bei einem Verfahren zum Betreiben einer Waschmaschine zum verbesserten Einspülen von Waschmittel eine Umfluteinrichtung zu aktivieren. Hierbei wird die Waschflüssigkeit vorgeheizt, bevor die Umflutung aktiviert wird.From the GB 2 204 328 A It is also known, in a method for operating a washing machine for improved washing detergent to activate a flooding device. Here, the washing liquid is preheated before the flooding is activated.

Die DE 10 2006 039 477 A1 offenbart ein Verfahren zur Steuerung einer Umwälzpumpe in einer Waschmaschine, die insgesamt in Abhängigkeit von der Aktivität anderer Verbraucher eingeschaltet wird. Damit soll erreicht werden, dass die eingelassenen Wassermenge genau der Sollmenge entspricht, da bei der Sensierung der Wassermenge Störeinflüsse, verursacht durch die Umflutung, vermieden werden. Ferner wird beim Aufheizen die Umwälzpumpe nicht betrieben, damit das heiße Waschwasser möglichst lange im Laugenbehälter verbleibt, um ggf. Keime abzutöten.The DE 10 2006 039 477 A1 discloses a method of controlling a circulation pump in a washing machine that is turned on overall depending on the activity of other consumers. This is intended to ensure that the amount of water admitted corresponds exactly to the desired quantity, since disturbing influences caused by the flooding are avoided when the amount of water is sensed. Furthermore, the circulating pump is not operated during heating, so that the hot wash water remains as long as possible in the tub to kill germs if necessary.

Die DE 39 13 642 A1 offenbart allgemein einen Wasserzulauf in einer Waschmaschine, der mittels eines Druckwächters geregelt wird.The DE 39 13 642 A1 generally discloses a water inlet in a washing machine controlled by a pressure switch.

Die EP 1 502 986 A1 offenbart ein Verfahren zum Betreiben einer Waschmaschine mit einer Umfluteinrichtung, bei dem während des Umflutens die Wäschemenge ermittelt wird im Zusammenspiel mit der WasserzuführungThe EP 1 502 986 A1 discloses a method for operating a washing machine with a flooding device, wherein during the flooding the amount of laundry is determined in conjunction with the water supply

Der Erfindung liegt deshalb die Aufgabe zu Grunde, ein Verfahren mit verbesserter Waschwirkung bereitzustellen bzw. das bekannte Verfahren auf einfache Weise zu optimieren sowie eine Waschmaschine zur Durchführung des Verfahrens bereitzustellen.The invention is therefore based on the object to provide a method with improved washing action or to optimize the known method in a simple manner and to provide a washing machine for performing the method.

Die Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 und durch eine Waschmaschine mit den Merkmalen des Anspruchs 11 gelöst. Vorteilhafte Ausführungen ergeben sich aus den abhängigen Ansprüchen 2 bis 10 und 12.The object is achieved by a method having the features of claim 1 and by a washing machine having the features of claim 11. Advantageous embodiments will become apparent from the dependent claims 2 to 10 and 12th

Der wesentliche Vorteil des erfindungsgemäßen Verfahrens ist, dass auf einfache Weise eine Verbesserung der Waschwirkung bei etwa gleicher Dauer und Wassermenge, gegenüber einer herkömmlichen Waschphase ohne Umfluten erreicht wird. Aufwändige konstruktive Maßnahmen sind hierbei bis auf die einfache Umfluteinrichtung, die die Waschflüssigkeit aus dem unteren Bereich des Laugenbehälters in den oberen Bereich des Laugenbehälters bzw. in die Trommel fördern kann, nicht notwendig.The main advantage of the method according to the invention is that a simple way to improve the washing effect at about the same duration and amount of water, compared to a conventional washing phase without flooding is achieved. Elaborate constructional measures are not necessary here except for the simple circulating device, which can convey the washing liquid from the lower region of the tub into the upper region of the tub or into the drum.

Beim erfindungsgemäßen Verfahren ist es vorgesehen, dass in der Waschphase die Waschflüssigkeit erhitzt und die Umfluteinrichtung aktiviert ist. Die Umfluteinrichtung besitzt eine Rohrleitung, die vom unteren Bereich des Laugenbehälters ausgehend in den oberen Bereich geführt ist und dort, beispielsweise mittels einer im Bereich der frontseitigen Tür angebrachten Düse mündet. In der Leitung ist eine Pumpe zwischengeschaltet, die die Waschflüssigkeit entsprechend fördern kann. Das bedeutet, dass die Wäsche bereits während des Aufheizens bzw. in der Aufheizphase mit Waschflüssigkeit benetzt bzw. durchfeuchtet wird, in der das Waschmittel bereits zumindest nahezu vollständig aufgelöst ist. Das Aufheizen mittels des eingeschalteten Heizkörpers bewirkt, dass auch die Substanzen des Waschmittels optimal aufgelöst werden, die eine höhere Temperatur als die Wassereinlauftemperatur, beispielsweise 18 bis 25°C, benötigen. Somit erfolgt eine optimale Verteilung der waschwirkenden Substanzen in das Gewebe der Wäschestücke. Als weitere Maßnahme wird beim erfindungsgemäßen Verfahren die Umfluteinrichtung phasenweise aktiviert, wobei der Heizkörper in den aktiven Phasen der Umfluteinrichtung abgeschaltet ist. Dadurch ist sichergestellt, dass beim Absinken des Laugenniveaus unterhalb des kritischen Grenzwertes, bei dem der Heizkörper gerade noch mit Waschflüssigkeit bedeckt ist, keine Zerstörung oder Schädigung des Heizkörpers auftreten kann. Der Heizkörper ist also nur in den zeitlichen Phasen eingeschaltet, wenn keine Umflutung erfolgt. Die Trommel, die sich innerhalb des Laugenbehälters befindet und in der die Wäsche eingefüllt ist, kann hierbei während der gesamten Waschphase gedreht werden, um eine gute Benetzung bzw. Durchfeuchtung und eine Durchmischung der Wäschestücke mit der Waschflüssigkeit zu erreichen.In the method according to the invention, it is provided that in the washing phase, the washing liquid is heated and the circulating device is activated. The circulating device has a pipeline, which is guided from the lower region of the tub starting in the upper area and there, for example, opens by means of a mounted in the front door door. In the line a pump is interposed, which can promote the washing liquid accordingly. This means that the laundry already during heating or wetted in the heating phase with washing liquid or moistened, in which the detergent is already at least almost completely dissolved. The heating by means of the switched on radiator causes the substances of the detergent are optimally dissolved, which require a higher temperature than the water inlet temperature, for example 18 to 25 ° C. Thus, there is an optimal distribution of the washing substances in the fabric of the laundry. As a further measure, the circulating device is activated in phases in the method according to the invention, wherein the radiator is switched off in the active phases of the circulating device. This ensures that the sinking of the liquor level below the critical limit at which the radiator is just covered with washing liquid, no destruction or damage to the radiator can occur. The radiator is thus switched on only in the temporal phases, if no flooding occurs. The drum, which is located within the tub and in which the laundry is filled, can here during the entire washing phase rotated in order to achieve good wetting or thorough moistening and thorough mixing of the laundry items with the washing liquid.

Hierbei ist es vorteilhaft, dass der Heizkörper nach Beendigung des Zeitabschnitts mit aktivierter Umfluteinrichtung eingeschaltet wird, und dass das Ein- und Ausschalten des Heizkörpers und der Umfluteinrichtung mehrmals wiederholt wird. Durch die Aufteilung der Aufheizphase in mehrere Abschnitte wird die Auflösung des Waschmittels innerhalb der Waschflüssigkeit und somit die Waschwirkung nochmals verbessert.It is advantageous that the radiator is turned on after completion of the period with activated Umfluteinrichtung, and that the switching on and off of the radiator and the Umfluteinrichtung is repeated several times. By dividing the heating phase in several sections, the resolution of the detergent within the washing liquid and thus the washing action is further improved.

In einer zweckmäßigen Weiterbildung erfolgt das Einschalten des Heizkörpers nach dem Ausschalten der Umfluteinrichtung erst nach Ablauf einer Verzögerungszeit. Dadurch wird sichergestellt, dass die umgeflutete Waschflüssigkeit aus den Leitungen der Umfluteinrichtungen fließt bzw. aus der Wäsche quillt und sich wieder im unteren Bereich des Laugenbehälters sammelt, so dass sichergestellt ist, dass der Heizkörper beim Einschalten wieder vollständig mit Waschflüssigkeit bedeckt ist. Vorteilhaft ist hierbei eine Verzögerungszeit von einigen Sekunden, beispielsweise 2 bis 10 Sekunden, vorzugsweise 3 bis 6 Sekunden, vorzusehen.In an expedient development, the switching on of the radiator after switching off the Umfluteinrichtung takes place only after a delay time. This ensures that the flooded washing liquid from the lines of Umfluteinrichtungen flows or swells from the laundry and collects again in the lower part of the tub, so as to ensure that the radiator is completely covered with washing liquid again when switching. A delay time of a few seconds, for example 2 to 10 seconds, preferably 3 to 6 seconds, is advantageous here.

In einer anderen, zweckmäßigen Ausführung erfolgt das Einschalten des Heizkörpers nach dem Ausschalten der Umfluteinrichtung abhängig vom Pegelstand der Waschflüssigkeit innerhalb des Laugenbehälters. Somit kann die Verzögerungszeit an das Saugverhalten bzw. an das Verhalten der Wäsche hinsichtlich Flüssigkeitsaufnahme und Abgabe optimal angepasst werden. Dadurch wird bei einem Wäscheposten mit Wäschestücken geringer Saugfähigkeit diese Verzögerungszeit verkürzt, so dass sich die gesamte Aufheizphase etwas verkürzt.In another expedient embodiment, the turning on of the radiator after switching off the Umfluteinrichtung depends on the level of the washing liquid within the tub. Thus, the delay time can be optimally adapted to the suction behavior or to the behavior of the laundry in terms of fluid intake and delivery. As a result, this delay time is shortened in a laundry with laundry items low absorbency, so that the entire heating slightly shortened.

Hierbei ist es zweckmäßig, dass das Einschalten des Heizkörpers erst dann erfolgt, wenn der Pegelstand einen kritischen Grenzwert überschritten hat, wobei beim kritischen Grenzwert der Heizkörper derart mit Waschflüssigkeit in Verbindung steht, dass keine Überhitzung bzw. Beschädigung des Heizkörpers auftritt. Damit wird die Sicherheit gegen Überhitzen nochmals verbessert bzw. das unerwünschte Trockenheizen zuverlässig vermieden.It is expedient that the turning on of the radiator takes place only when the water level has exceeded a critical limit, with the critical limit of the radiator is so in communication with washing liquid that no overheating or damage to the radiator occurs. Thus, the safety against overheating is further improved or the unwanted dry heating reliably avoided.

Insgesamt ist es vorteilhaft, dass das Ein- und Ausschalten des Heizkörpers und das Aktivieren und Deaktivieren der Umfluteinrichtung während des Aufheizens der Wasch- und/oder Spülflüssigkeit zu Beginn der Waschphase bzw. einer Spülphase erfolgen. Hierbei liegt die Einschaltzeit des Heizkörpers im Bereich von 1 bis 6 Minuten und die Aktivierungszeit der Umfluteinrichtung im Bereich von 30 Sekunden bis 3 Minuten. Dadurch wird erreicht, dass der Heizkörper in den Zeitabschnitten des Aufheizens eine gewisse Wärmemenge in die Waschflüssigkeit übertragen kann. Die kürzeren Zeitabschnitte für die aktivierte Umfluteinrichtung sorgen dafür, dass sich die Waschflüssigkeit nicht all zu sehr abkühlt, wobei eine gute Durchfeuchtung bzw. Durchmischung der Wäschestücke mit der Waschflüssigkeit bereitgestellt wird.Overall, it is advantageous that the switching on and off of the radiator and the activation and deactivation of the circulating device during the heating of the washing and / or rinsing liquid at the beginning of the washing phase or a rinsing carried out. Here, the turn-on time of the heater is in the range of 1 to 6 minutes and the activation time of the circulating device in the range of 30 seconds to 3 minutes. This ensures that the radiator can transmit a certain amount of heat in the washing liquid in the periods of heating. The shorter time periods for the activated flooding device ensure that the washing liquid does not cool too much, whereby a good moisture penetration or mixing of the laundry with the washing liquid is provided.

Für die Verzögerung vom Abschalten der Umfluteinrichtung bis zum Einschalten des Heizkörpers ist es vorteilhaft, die Verzögerungszeit im Bereich von 5 bis 30 Sekunden vorzusehen.For the delay from switching off the Umfluteinrichtung to turn on the radiator, it is advantageous to provide the delay time in the range of 5 to 30 seconds.

In einer zweckmäßigen Ausführung erfolgt die Aktivierung der Umfluteinrichtung abhängig vom Pegelstand der Waschflüssigkeit im Laugenbehälter, wobei beim Unterschreiten eines unteren Grenzwertes die Umfluteinrichtung abgeschaltet oder mit verminderter Förderleistung betrieben wird. Dadurch wird vermieden, dass die Umfluteinrichtung bzw. die Pumpe Luft ansaugt, was normalerweise zu erhöhten Betriebsgeräuschen führt. Ferner wird ein unnötiger Betrieb der Umfluteinrichtung vermieden, wodurch Verschleiß und Energieverbrauch vermindert werden.In an expedient embodiment, the activation of the circulating device is dependent on the level of the washing liquid in the tub, wherein when falling below a lower limit the Umfluteinrichtung is switched off or operated at a reduced flow rate. This avoids that the Umfluteinrichtung or the pump sucks air, which usually leads to increased operating noise. Furthermore, unnecessary operation of the flooding device is avoided, thereby reducing wear and energy consumption.

Um das Wasser bzw. die Waschflüssigkeit und das Behandlungsmittel in den Laugenbehälter zu bringen, wird zu Beginn der Waschphase vor dem Einschalten des Heizkörpers die Waschflüssigkeit mittels einlassenden Wassers unter Zugabe von zumindest eines Behandlungsmittels gebildet.In order to bring the water or the washing liquid and the treatment agent into the tub, at the beginning of the washing phase before switching on the heater, the washing liquid is formed by means of inlet water with the addition of at least one treatment agent.

Die Erfindung betrifft ferner eine Waschmaschine mit einem Laugenbehälter zur Aufnahme von Waschflüssigkeit zum Behandeln von Wäsche, eine im Laugenbehälter horizontal drehbar gelagerte Trommel, einen Motor zum Drehen der Trommel, einen Heizkörper, eine Umfluteinrichtung, eine Wasserzulaufeinrichtung und eine Steuereinrichtung zum Steuern der einzelnen Phasen des ausgewählten Waschprogramms, wobei die Steuereinrichtung dafür konfiguriert ist, die Umfluteinrichtung, den Heizkörper und/oder die Wasserzulaufeinrichtung zu aktivieren oder deaktivieren bzw. ein- oder auszuschalten.The invention further relates to a washing machine with a tub for holding washing liquid for treating laundry, a horizontally rotatably mounted drum in the tub, a motor for rotating the drum, a radiator, a Umfluteinrichtung, a water inlet device and a control device for controlling the individual phases of the selected washing program, wherein the control device is configured to activate or deactivate or switch on or off the Umfluteinrichtung, the radiator and / or the water inlet device.

In einer vorteilhaften Ausführung umfasst die Waschmaschine zumindest einen Sensor zur Erfassung bzw. Ermittlung des kritischen Pegelstandes und/oder des unteren Grenzwertes, wobei der Sensor mit der Steuereinrichtung in Verbindung steht. Als Sensor kann beispielsweise ein Drucksensor verwendet werden, der mit einer Luftfalle am Laugenbehälter im unteren Bereich mittels einer Schlauchleitung verbunden ist. Alternativ können auch Leitwertsensoren an der Laugenbehälterwand angebracht werden, die dann ein Signal an die Steuereinrichtung abgeben, wenn sie von Waschflüssigkeit bedeckt sind. Andere Sensoren sind ebenfalls einsetzbar, wobei die Steuereinrichtung entsprechend zu konfigurieren ist.In an advantageous embodiment, the washing machine comprises at least one sensor for detecting or determining the critical water level and / or the lower limit value, wherein the sensor is in communication with the control device. As a sensor, for example, a pressure sensor can be used which is connected to an air trap on the tub in the lower region by means of a hose line. Alternatively, conductance sensors may also be attached to the tub wall, which then provide a signal to the controller when covered by wash liquid. Other sensors can also be used, wherein the control device is to be configured accordingly.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigen

Fig. 1:
eine Waschmaschine in einer skizzierten Schnittdarstellung,
Fig. 2:
ein Waschprogramm als Diagramm im zeitlichen Ablauf und
Fig. 3a - 3d:
die Ansteuerung des Heizkörpers und der Umfluteinrichtung in zeitlicher Abfolge.
An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. Show it
Fig. 1:
a washing machine in a sketched sectional view,
Fig. 2:
a washing program as a diagram in chronological order and
3a-3d:
the control of the radiator and the Umfluteinrichtung in time sequence.

In Fig. 1 ist in rein schematischer Darstellung eine Waschmaschine 1, mit einem Laugenbehälter 2 dargestellt. Die Positions- und Richtungsangaben beziehen sich auf die betriebsgemäße Aufstellposition der Waschmaschine 1. Innerhalb des Laugenbehälters 2 ist eine drehbar gelagerte und über einen elektrischen Motor 13 angetriebene Trommel 3 angeordnet, die die im Laugenbehälter 2 befindlichen Wäschestücke 8 bewegt. Die Trommel 3 ist im vorliegenden Ausführungsbeispiel aus Edelstahl hergestellt und mit einer Vielzahl an Öffnungen für die Durchflutung versehen. Das Gehäuse 4 hat eine Beladungsöffnung 9, über die das Innere der Trommel 3 durch die Dichtungsmanschette 6 hindurch erreichbar ist. Die Beladungsöffnung 9 ist mittels einer Tür 5 verschließbar. Im unteren Bereich des Laugenbehälters 2 ist ein Heizkörper 7 angeordnet, der die Waschflüssigkeit im Laugenbehälter erhitzen kann. Im oberen Bereich der Maschine 1 ist ein Einlassventil 15 skizziert, welches das Einlaufen des Wassers aus dem Versorgungsnetz bereitstellt. Über den Einspülkasten 11 wird das Wasser über das Verbindungsrohr 14 in den Laugenbehälter 2 geleitet, wobei im Einspülkasten 11 eingegebenes Waschmittel mit in den Laugenbehälter 2 gespült wird. Unterhalb des Laugenbehälters 2 ist eine Ablaufeinrichtung 12 angeordnet, die die verbrauchte Waschflüssigkeit oder das Spülwasser aus dem Laugenbehälter 2 zur Ablaufleitung 12c herausführt, die in der Regel in einen Abwasserkanal mündet. Die Steuereinrichtung 18 steuert das Einlassventil 15, die Aktivität der Ablaufeinrichtung 12 den Antriebsmotor 13, der über das Leistungsteil oder einen Frequenzumrichter 16 bestromt wird, und den Heizkörper 7. Im unteren Bereich des Laugenbehälters 2, bezogen auf die bertriebsgemäße Aufstellposition der Waschmaschine, ist die Pumpe 17a einer Umfluteinrichtung angebracht. Die Pumpe 17a ist auf der Eingangsseite bzw. Saugseite mit dem Ablaufrohr 12b verbunden und kann die darin befindliche Waschflüssigkeit 19 durch die Leitung 17b in den oberen Bereich des Laugenbehälters 2 bzw. der Trommel 3 fördern. Durch die Düse bzw. den Auslass 17c spritzt bzw. fließt die Waschflüssigkeit 19 auf die Wäschestücke 8.In Fig. 1 is a purely schematic representation of a washing machine 1, shown with a tub 2. The position and direction information refer to the operational installation position of the washing machine 1. Within the tub 2 a rotatably mounted and driven by an electric motor 13 drum 3 is arranged, which moves the laundry items located in the tub 2 8. The drum 3 is made in the present embodiment of stainless steel and provided with a plurality of openings for the flooding. The housing 4 has a loading opening 9, via which the interior of the drum 3 can be reached through the sealing sleeve 6. The loading opening 9 can be closed by means of a door 5. In the lower region of the tub 2, a radiator 7 is arranged, which can heat the washing liquid in the tub. In the upper part of the machine 1, an inlet valve 15 is sketched, which provides the running in of the water from the supply network. About the Einspülkasten 11, the water is passed through the connecting pipe 14 into the tub 2, wherein in the dispenser 11 entered detergent is flushed into the tub 2. Below the tub 2, a drain device 12 is arranged, which leads the spent washing liquid or the rinse water from the tub 2 to the drain line 12c, which usually opens into a sewer. The control device 18 controls the inlet valve 15, the activity of the drain device 12, the drive motor 13, which is energized via the power unit or a frequency converter 16, and the radiator 7. In the lower part of the tub 2, based on the Bertriebsgemäße installation position of the washing machine, which is Pump 17a attached to a flooding device. The pump 17a is connected to the drain pipe 12b on the inlet side and suction side, respectively, and can convey the washing liquid 19 therein through the pipe 17b into the upper portion of the tub 2 and the drum 3, respectively. The washing liquid 19 is injected or flows onto the laundry items 8 through the nozzle or the outlet 17c.

In Fig. 1 ist ferner dargestellt, dass sich der Pegel der Waschflüssigkeit 19 knapp unterhalb des Maximalwertes Max befindet. Beim kritischen Pegel Krit ist der Heizkörper 7 knapp mit Waschflüssigkeit bedeckt, so dass kein Trockenheizen stattfindet. Unterhalb des minimalen Pegels Min besteht die Gefahr, dass die Umflutpumpe 17a nicht mehr vollständig Flüssigkeit ansaugen kann, so dass es zu einer erhöhten Lärmbildung kommen kann.In Fig. 1 is also shown that the level of the washing liquid 19 is just below the maximum value Max. At the critical level Crit the heater 7 is just covered with washing liquid, so that no dry heating takes place. Below the minimum Level Min, there is a risk that the circulating pump 17a can no longer completely suck in liquid, so that it can lead to increased noise.

In Fig. 2 ist beispielhaft ein kompletter Ablauf eines Waschprogramms WP in einem Diagramm dargestellt. Auf der Zeitachse t sind die einzelnen Phasen innerhalb des Waschprogramms WP aufgezeigt. Der hier dargestellte Programmablauf WP umfasst eine Waschphase Wa, eine Spülphase Sp und eine Schleuderphase Sc. In diesen einzelnen Phasen wird der Wasserzulauf 15 und der Ablauf 12 entsprechend gesteuert. Auch der Heizkörper 7 und die Umfluteinrichtung 17 werden entsprechend gesteuert, um die Waschflüssigkeit 19 auf die vorgegebene Temperatur zu erwärmen. Zu Beginn der Waschphase wird das Wasser in die Einspüleinrichtung bzw. den Einspülkasten 11 eingelassen, wodurch das darin bevorratete Behandlungsmittel, wie Waschpulver, durch das Verbindungsrohr 14 in den Laugenbehälter 2 eingelassen wird. Anschließend folgt der Aufheizabschnitt Hz, in dem die Waschflüssigkeit mittels eingeschaltetem Heizkörper 7 auf die Temperatur erhitzt wird, die von der Steuereinrichtung 18 vom ausgewählten Programm vorgegeben wird. Nach Erreichen der vorgegeben Temperatur wird der Heizkörper 7 abgeschaltet und der sogenannte Nachwaschabschnitt Na folgt. In diesem Nachwaschabschnitt Na wird die Wäsche 8 mittels rotierender Trommel 3 bewegt, wobei sich die Waschflüssigkeit 19 abkühlt. Die Waschphase Wa wird mit dem Abpumpen beendet, wobei die Ablaufeinrichtung 12, insbesondere die Pumpe 12a oder ein Ablaufventil aktiviert wird. Beim Abpumpen kann auch geschleudert werden, damit die mit Waschmittel versetzte Waschflüssigkeit 19 aus dem Gewebe der Wäschestücke 8 entfernt wird. Anschließend folgt der Spülabschnitt Sp, bei dem frisches Wasser in den Laugenbehälter eingelassen und die Wäschestücke 8 darin bewegt werden. Zum Ende des Spülabschnitts wird das Spülwasser abgepumpt, wobei anschließend das Endschleudern Sc zum Entwässern der Wäschestücke 8 folgt. Beim Endschleudern wird die Trommel 3 mit einer gegenüber dem Waschvorgang erhöhte Drehzahl gedreht, bei der die Wäschestücke 8 am Trommelmantel anliegen und das Wasser bzw. die Waschflüssigkeit aufgrund der Zentrifugalkraft aus dem Gewebe nach außen durch die Trommelöffnungen geschleudert wird. Die Ablaufeinrichtung 12 ist hierbei aktiviert, so dass die Flüssigkeit aus dem Laugenbehälter 2 entfernt wird.In Fig. 2 By way of example, a complete sequence of a washing program WP is shown in a diagram. The individual phases within the wash program WP are shown on the time axis t. The program sequence WP shown here comprises a washing phase Wa, a rinsing phase Sp and a spinning phase Sc. In these individual phases of the water inlet 15 and the outlet 12 is controlled accordingly. Also, the radiator 7 and the Umfluteinrichtung 17 are controlled accordingly to heat the washing liquid 19 to the predetermined temperature. At the beginning of the washing phase, the water is introduced into the flushing device or the dispenser 11, whereby the processing agent stored therein, such as washing powder, is introduced through the connecting tube 14 into the tub 2. This is followed by the heating-up section Hz, in which the washing liquid is heated by means of the activated heating element 7 to the temperature preset by the control device 18 by the selected program. After reaching the predetermined temperature of the radiator 7 is turned off and the so-called Nachwaschabschnitt Na follows. In this Nachwaschabschnitt Na, the laundry 8 is moved by means of rotating drum 3, wherein the washing liquid 19 cools. The washing phase Wa is ended with the pumping, wherein the drain device 12, in particular the pump 12a or a drain valve is activated. When pumping can also be spun so that the scrubbing added with detergent washing liquid 19 is removed from the fabric of the laundry items 8. This is followed by the flushing section Sp, in which fresh water is introduced into the tub and the items of laundry 8 are moved therein. At the end of the rinsing section, the rinse water is pumped out, followed by the final spin Sc for dewatering the laundry items 8. In the final spin, the drum 3 is rotated at a higher speed compared with the washing process, in which the laundry items 8 abut the drum shell and the water or the washing liquid is thrown out of the fabric due to the centrifugal force out through the drum openings. The drain device 12 is activated in this case, so that the liquid is removed from the tub 2.

In Fig. 3a bis 3d ist die Ansteuerung des Heizkörpers 7 und der Umfluteinrichtung 17 gemäß dem erfindungsgemäßen Verfahren in einem Diagramm dargestellt. Die Zeitpunkte auf der Zeitachse t sind hierbei nur symbolisch angegeben, im realen Ablauf entsprechen diese Kennzeichnungen einer Zeiteinheit. Die Aktivität der Wasserzulaufeinrichtung 15 und die Trommeldrehung werden hierbei nicht berücksichtigt, da es für die Erläuterung des erfindungsgemäßen Verfahrens von untergeordneter Bedeutung ist. Zum Zeitpunkt t=1 befindet sich bereits so viel Waschflüssigkeit 19 im Laugenbehälter 2, dass der Heizkörper 7 eingeschaltet wird (Fig. 3b). Die Temperatur Temp der Waschflüssigkeit steigt gemäß Fig. 3a, in diesem Beispiel von etwa 20°C auf etwa 40°C. Zum Zeitpunkt t=2 wird die Umfluteinrichtung 17 bzw. die Pumpe 17a eingeschaltet (Fig. 3c) und der Heizkörper 7 abgeschaltet (Fig. 3b). Gemäß Fig. 3d ist zu erkennen, dass sich der Flüssigkeitsspiegel innerhalb des Laugenbehälters 2 vom Maximalwert Max vermindert. Sobald der Flüssigkeitsspiegel das Minimum Min erreicht, wird die Pumpe 17a abgeschaltet, weil ansonsten die Gefahr besteht, dass die Pumpe 17a trocken läuft bzw. Luft ansaugt, was zu unerwünschter Geräuschbildung führen würde. Im Zeitpunkt t=2a wird die Umfluteinrichtung 17 abgeschaltet (Fig. 3c) und zum späteren Zeitpunkt t=3, nach Ablauf der Verzögerungszeit Vt, der Heizkörper 7 eingeschaltet (Fig. 3b). Durch die Verzögerung Vt ist sichergestellt, dass der Heizkörper 7 erst dann eingeschaltet wird, sobald der Flüssigkeitspegel den kritischen Grenzwert Krit überschritten hat (Fig. 3d). Nach dem Inaktivieren der Umfluteinrichtung 17 fließt die in den Kanälen 17b, 17c der Umfluteinrichtung 17 und die im Gewebe der Wäschestücke 8 befindliche Waschflüssigkeit 19 zurück in den unteren Bereich des Laugenbehälters 2, so dass sich der Pegel der freien Flotte wieder etwas erhöht (Fig. 3d). Der Heizkörper ist bis zum Zeitpunkt t=4 eingeschaltet, so dass sich die Temperatur der Waschflüssigkeit 19 wieder erhöht, in diesem Beispiel auf etwa 50°C. Anschließend wird der Heizkörper 7 ab- und die Umfluteinrichtung 17 eingeschaltet (Fig. 3b, 3c), so dass die oben beschriebene Abfolge bis zum Zeitpunkt t=5 wiederholt wird. Ab dem Zeitpunkt t=5 wird der Heizkörper 7 wieder eingeschaltet, so dass die vorgegebene Temperatur, hier 60°C, für die Waschflüssigkeit 19 erreicht wird. Ab dem Zeitpunkt t=6 folgt die sogenannte Nachwaschzeit, in der der Heizkörper 7 ausgeschaltet bleibt (Fig. 3b), so dass sich die Waschflüssigkeit 19 langsam abkühlt (Fig. 3a). Die Umfluteinrichtung 17 wird hierbei kontinuierlich betrieben oder in Abhängigkeit des Pegels (Fig. 3d) beim Erreichen des minimalen Pegels Min abgeschaltet oder mit verminderter Förderleistung betrieben. Anhand des Temperaturverlaufs gemäß Fig. 3a ist zu erkennen, dass sich der Aufheizabschnitt etwas verlängert. Aufgrund der vorteilhaften Waschmittelauflösung und der besseren Durchfeuchtung der Wäsche kann der Gesamtablauf des Waschprogramms WP verkürzt, die Waschmittelmenge reduziert und/oder die Waschwirkung verbessert werden.In Fig. 3a to 3d the control of the radiator 7 and the circulating device 17 according to the method of the invention is shown in a diagram. The time points on the time axis t are given here only symbolically, in the real process, these markings correspond to a time unit. The activity of the water inlet device 15 and the drum rotation are not taken into account, since it is of minor importance for the explanation of the method according to the invention. At time t = 1 is already so much washing liquid 19 in the tub 2 that the radiator 7 is turned on becomes ( Fig. 3b ). The temperature Temp of the washing liquid rises according to Fig. 3a , in this example from about 20 ° C to about 40 ° C. At time t = 2, the flooding device 17 or the pump 17a is switched on ( Fig. 3c ) and the radiator 7 is switched off ( Fig. 3b ). According to Fig. 3d It can be seen that the liquid level within the tub 2 is reduced from the maximum value Max. Once the liquid level reaches the minimum min, the pump 17a is turned off, otherwise there is a risk that the pump 17a runs dry or sucks in air, which would lead to undesirable noise. At time t = 2a, the flooding device 17 is switched off ( Fig. 3c ) and at the later time t = 3, after the delay time Vt, the radiator 7 is turned on ( Fig. 3b ). The delay Vt ensures that the heating element 7 is not switched on until the liquid level has exceeded the critical limit value Krit ( Fig. 3d ). After inactivation of the flooding device 17, the washing liquid 19 located in the channels 17b, 17c of the flooding device 17 and in the fabric of the laundry items 8 flows back into the lower region of the liquor container 2, so that the level of the free liquor again increases slightly ( Fig. 3d ). The radiator is turned on until the time t = 4, so that the temperature of the washing liquid 19 increases again, in this example to about 50 ° C. Thereafter, the radiator 7 is switched off and the circulating device 17 is switched on ( Fig. 3b, 3c ), so that the above-described sequence is repeated until time t = 5. From the time t = 5, the radiator 7 is turned on again, so that the predetermined temperature, here 60 ° C, is achieved for the washing liquid 19. From time t = 6 follows the so-called Nachwaschzeit in which the radiator 7 remains off ( Fig. 3b ), so that the washing liquid 19 slowly cools down ( Fig. 3a ). The circulating device 17 is operated continuously or depending on the level ( Fig. 3d ) are shut off when reaching the minimum level Min or operated at reduced capacity. Based on the temperature profile according to Fig. 3a it can be seen that the heating section extends slightly. Due to the advantageous detergent dissolution and the better moisture penetration of the laundry, the overall sequence of the washing program WP can be shortened, the amount of detergent can be reduced and / or the washing effect can be improved.

Claims (12)

  1. Method for operating a washing machine (1) having a suds container (2) for receiving washing liquid (19) for treating laundry (8), a heating member (7), a recirculation device (17) and a water supply device (15), the method comprising a washing phase (Wa) having a heating member (7) which is temporarily switched on in order to heat the washing liquid (19), and having an activated recirculation device (17) which conveys the washing liquid (19) from the lower region of the suds container (2) into the upper region, based on the operational installation position of the washing machine (1),
    the recirculation device (17) being activated in the washing phase (Wa) in at least one time period (Aktiv) and the heating member (7) being switched off (Aus) during this/these time period(s),
    characterised in that
    the heating member (7) is switched on by means of the activated recirculation device (17) after the time period (Aktiv) has finished and in that switching on and switching off the heating member (7) and the recirculation device (17) is repeated several times.
  2. Method according to claim 1,
    characterised in that
    the heating member (7) is switched on (Ein), after switching off (Inaktiv) the recirculation device (17), only after a delay time (Vt) has elapsed.
  3. Method according to claim 1,
    characterised in that
    the heating member (7) is switched on (Ein), after switching off (Inaktiv) the recirculation device (17), depending on the level (Krit) of the washing liquid (19) inside the suds container (2).
  4. Method according to claim 3,
    characterised in that
    the heating member (7) is switched on if the level has exceeded a critical limit value (Krit), at the critical limit value (Krit), the heating member (7) being in contact with the washing liquid (19) such that the heating member (7) does not overheat or become damaged.
  5. Method according to claim 1,
    characterised in that
    the heating member (7) is switched on and switched off, and the recirculation device (17) is activated and deactivated, while the washing liquid and/or a rinsing fluid is being heated at the start of the washing phase (Wa) and/or a rinsing phase (Sp).
  6. Method according to claim 1,
    characterised in that
    the switch-on (Ein) time of the heating member (7) is in the range of from 1 to 6 minutes and the activation time (Aktiv) of the recirculation device (17) is in the range of from 30 seconds to 3 minutes.
  7. Method according to claim 2,
    characterised in that
    the delay time (Vt) for switching on the heating member (7) is in the range of from 5 to 30 seconds.
  8. Method according to claim 1,
    characterised in that
    activating the recirculation device (17) is dependent on the level of the washing liquid (19) in the suds container (2), the recirculation device (17) being switched off or operated with reduced capacity if a lower limit value (Min) is not reached.
  9. Method according to claim 1,
    characterised in that
    at the start of the washing phase (Wa), before the heating member (7) is switched on, the washing liquid (19) is formed by means of water which is inlet with the addition of at least one treatment agent.
  10. Method according to claim 1,
    characterised in that
    in the washing phase (Wa), the laundry (8) is moved in the suds container (2).
  11. Washing machine (1) comprising a suds container (2) for receiving washing liquid (19) for treating laundry (8), a drum (3) which is horizontally rotatably mounted in the suds container (2), a motor (13) for rotating the drum (3), a heating member (7), a recirculation device (17), a water supply device (15), and a control device (16, 18) for controlling the individual phases (Wa, Sp, Sc) of the selected washing programme (WP),
    characterised in that
    the control device (16, 18) is configured to activate or deactivate, or switch on or switch off, the recirculation device (17), the heating member (7) and the water supply device (15) according to the method according to any of claims 1 to 10.
  12. Washing machine (1) according to claim 11,
    characterised by at least one sensor (20) for detecting or determining the critical level and/or the lower limit value, the sensor (20) being connected to the control device (16, 18).
EP09010893.7A 2008-09-09 2009-08-26 Method for operating a washing machine and washing machine Active EP2161365B1 (en)

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EP2161365A3 EP2161365A3 (en) 2014-01-22
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Cited By (2)

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DE102020111616A1 (en) 2020-04-29 2021-11-04 Miele & Cie. Kg Method for controlling the circulation pump of a washing machine or washer dryer

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ES2548581T3 (en) 2015-10-19
EP2161365A3 (en) 2014-01-22
EP2161365A2 (en) 2010-03-10

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