EP2312036B1 - Washing machine and process for treating laundry with foam - Google Patents

Washing machine and process for treating laundry with foam Download PDF

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Publication number
EP2312036B1
EP2312036B1 EP10186275.3A EP10186275A EP2312036B1 EP 2312036 B1 EP2312036 B1 EP 2312036B1 EP 10186275 A EP10186275 A EP 10186275A EP 2312036 B1 EP2312036 B1 EP 2312036B1
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EP
European Patent Office
Prior art keywords
foam
drum
laundry
washing machine
washing
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EP10186275.3A
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German (de)
French (fr)
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EP2312036A1 (en
Inventor
Harald MOSCHÜTZ
Ingo Schulze
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Priority to PL10186275T priority Critical patent/PL2312036T3/en
Publication of EP2312036A1 publication Critical patent/EP2312036A1/en
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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
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/006—Methods for washing, rinsing or spin-drying for washing or rinsing only
    • 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
    • D06F17/00—Washing machines having receptacles, stationary for washing purposes, wherein the washing action is effected solely by circulation or agitation of the washing liquid
    • D06F17/12—Washing machines having receptacles, stationary for washing purposes, wherein the washing action is effected solely by circulation or agitation of the washing liquid solely by gases, e.g. air or steam, introduced into the washing liquid

Definitions

  • the invention relates to a process for the treatment of laundry with foam.
  • the mechanical processing of laundry items in a washing machine equipped with a drum is mainly ensured by a cyclically repeated lifting of the laundry items in the drum arranged Wäschemit Meeting and falling down the laundry items of these during the rotation of the drum (laundry case).
  • an optimal so-called discharge parabola is generally determined by setting a rotational speed of the drum.
  • the input of mechanical energy is achieved at a diameter of the drum of a front loader washing machine currently in use in Europe at about 50 revolutions per minute.
  • a reversing rhythm i. a cyclically repeated switching the direction of rotation of the drum, the mechanical processing during washing can be varied and adjusted in a wide range.
  • Washing is particularly problematic with items of laundry that are sensitive to mechanical processing, such as items of laundry made of high-quality textiles such as wool, silk and tulle.
  • the laundry case of such laundry should be minimized, especially with a large diameter of the drum. Therefore, such a laundry item is hardly moved during the washing phase and partially pulled through only by the wash liquor by the drum is not completely rotated. This is also referred to as a wool swing or wool cradle. In this case, however, due to the greatly restricted movement of the laundry no adequate washing performance is achieved.
  • the DE 35 28 253 A1 discloses a method and a device for washing laundry, in particular a method for washing laundry in a washing machine while introducing room air into the washing and / or rinsing eye and a washing machine with a rotatable drum and a fan, one above the highest achievable water level
  • guided air duct and arranged along the bottom of the tub nozzle Room air is pressed into the tub by means of a blower, this room air coming in through the holes in the wash drum.
  • the DE 29 07 562 A1 describes a method for increasing the cleaning efficiency of washing machines and washing machines for carrying out the method.
  • a method for increasing the cleaning effect of drum washing machines is disclosed, in which the laundry is mechanically moved in a liquor and the liquor is added finely divided into low-frequency vibrations offset air.
  • a washing machine for carrying out this method has a tub disposed in a housing and means for moving the laundry within the tub, wherein in the housing a diaphragm air pump is mounted, the air via a mechanical vibrations transferable tube promotes by at least one nozzle head which distributes the air finely, which is arranged in the interior of the tub below the lye level.
  • the US 5 295 373 A discloses a method according to the features of the preamble of claim 1.
  • the object of the present invention is therefore to provide a method for the gentle treatment of laundry, in which the effects of the mechanics of the washing process are low, the washing machine and the method especially for the treatment of delicate laundry items from high-quality textiles such as wool, silk or Tulle are suitable.
  • this object is achieved by a method for the treatment of items of laundry according to the features of claim 1.
  • Preferred embodiments of the invention are listed in the respective dependent claims.
  • Preferred embodiments of the washing machine correspond to preferred embodiments of the method, even if it is not individually referred to herein.
  • the outlet of the device for introducing air preferably lies in a lower region between the drum and the tub.
  • "lower area between the drum and the tub” preferably means the area between the drum and the tub that passes through the wash liquor when it is present in the tub in an amount sufficient to contact the lower end of the drum.
  • the geometry of the foam can be optimized via the structural design of an outflow at the outlet of the device for introducing air, wherein a pore size between a fine-pored and a coarse-pored foam is adjusted.
  • a fine-pored foam generally has a better cleaning effect, as it can easily penetrate into laundry.
  • an additional structural expression of the drum is provided, which is provided to support a formation of foam.
  • This is preferably a Wäschemit facilitator, which is optimized with regard to the entry of air. It is understood that a plurality or multiplicity of such laundry carriers, in particular a number of three or four, is more preferred.
  • the aforementioned Wäschemit distractor can be molded as an integral part of the drum or used as an additional component in the drum. He also represents a variety of embodiments for the structural expression, which is conceivable in particular as an arrangement of special ribs or as a helically wound expression of an inner part of the drum.
  • the device for introducing air into the wash liquor is controllable by a corresponding controlled system, which in particular comprises a control device of the washing machine. This allows a controllable entry of air into the wash liquor. In addition to the possibility of a constant air entry, which can only be switched on and off, a continuous or stepwise variation of the amount of registered air can be provided.
  • a washing machine has switching means for rotating and stopping the drum.
  • a washing machine according to the invention preferably has a sensor for determining a quantity of a liquid or foam present in the tub as part of the said controlled system.
  • the filling of the drum with foam can be determined by a suitable sensor.
  • a suitable sensor for determining the amount of a liquid in the tub or a foam whose sensor signal is tracked during the process, a conventional sensor can be used for the determination of the water level.
  • Such a sensor generally measures a hydrostatic pressure p and / or a time gradient ( ⁇ p / ⁇ t) 1 of the hydrostatic pressure p.
  • the foam filling is generally indicated by a sudden pressure increase at the sensor.
  • An advantage of the invention is based on the fact that the laundry case is limited by a shortening of the fall path for the laundry items.
  • the inner portion of the drum is filled with foam when treating laundry with foam for the most part.
  • the laundry items therefore fall directly into the built foam.
  • the fall path is reduced and the kinetic energy of the laundry items when hitting the foam in a gentle manner in the deformation or movement and heating of the foam implemented.
  • the surprisingly improved cleaning effect can be explained by the increase in the relative movement between the foam and the laundry. This leads to an improvement in the dissolution and removal of impurities in the laundry.
  • the invention also relates to a method for particularly gentle treatment of laundry with a foam from a wash liquor in a washing machine with a rotatably mounted in a tub drum, a bottom of the tub arranged lye drain system, a drive motor for the drum, a heater and independent of the drum switchable device for introducing air into the wash liquor, wherein the foam is generated by the entry of air into the wash liquor by means of the device, the device is an air compressor pump and the air compressor pump via a in a lower region between the drum and the outlet located in the tub enters air into the wash liquor.
  • the foam generally fills a large part of the interior of the drum.
  • the foam is produced in an amount sufficient to provide the foam in the drum at a height of 1/3 to 2/3 of an inner diameter of the drum.
  • the process of the invention works particularly well when the wash liquor has a detergent which can give a stable foam.
  • a suitable detergent is for example in the DE 196 24 637 A1 described.
  • a detergent is used which allows the formation of foam bubbles, whose diameter is smaller than the diameter of openings in the drum and / or therein Wäschemit distractn.
  • the method according to the invention is carried out in a washing machine whose Wäschemitcalming and / or the interior of the drum have openings which are larger than the diameter of the foam bubbles generated with a detergent.
  • the openings are significantly larger than the diameters of the foam bubbles produced.
  • the generation of foam can take place when the drum is stationary.
  • the drum is rotated for rapid production of a foam and its good distribution within the drum at a suitable speed U 2 , wherein advantageously the direction of rotation can be changed.
  • the speed U 2 can vary within wide ranges. According to the invention, a rotational speed U 2 in the range of 30 to 80, in particular 40 to 60, for example 50 revolutions per minute is used.
  • a rotational speed U 2 in the range of 30 to 80, in particular 40 to 60, for example 50 revolutions per minute is used.
  • the generation of foam can be done at room temperature.
  • the process according to the invention is carried out with a heated wash liquor and / or with heating of the wash liquor.
  • the items of laundry are advantageously completely embedded in the foam.
  • Inventive methods have clear advantages.
  • the protection of delicate items such as wool, silk or tulle in a washing process is significantly improved.
  • the washing performance is improved, so that in otherwise the same sequence of a wash program, an improved washing effect is achieved.
  • FIG. 1 illustrated embodiment illustrated in more detail.
  • FIG. 1 is a schematic representation of the relevant parts for illustration of a washing machine in which a method according to the invention can be carried out. Other embodiments are conceivable.
  • the washing machine of the FIG. 1 embodiment shown has a tub 1, in which a drum 2 rotatably mounted and operated by a drive motor 14.
  • the axis of rotation 3 of the drum 2 is directed at a small angle (eg 13 °) from the horizontal to the front upwards, so that one has easier access and insight into the interior of the drum 2.
  • the washing machine also has a liquor inlet system comprising a water connection fitting for the domestic water network 8, an electrically controllable valve 9 and a supply line 10 to the tub 1, which may optionally also be guided via a Waschstoffein Kunststoff Anlagen Maschinene ("Ein Hamptonschale") 11, from which the feed water Can carry detergent portions in the tub 1.
  • a heater 13 in the tub 1, a heater 13.
  • the valve 9 as well as the heater 13 are controlled by a control device (“program control”) 12 in response to a program flowchart, the time program and / or the achievement of certain measured values of parameters as alkali level, foam level, liquor temperature, speed of the drum 2, etc. is bound within the washing machine.
  • a sensor 15 for the measurement of the hydrostatic pressure p in the tub 1 is provided.
  • a lye drainage system 20 which according to conventional practice in addition to corresponding lines a drain valve and a drain pump includes is shown for clarity only schematically.
  • FIG. 1 As a device 16 for entry of air into the wash liquor is in the embodiment of FIG. 1 shown a combination with an air compressor pump 17, the output 18 in a lower portion 19 between the drum 2 and the tub 1 protrudes.
  • the Wäschemit perhaps alone 4 are optimized as additional structural features of the drum 2 to support a formation of foam, as described in detail above.
  • a regulation of the formation of foam takes place via a controlled system comprising the sensor 15 and the control device 12, so that, whether by alternating switching on and off of the compressor pump 17 or a variation of their performance, the amount of foam available for the treatment of the textiles is controlled and especially limited.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Behandlung von Wäsche mit Schaum.The invention relates to a process for the treatment of laundry with foam.

Die mechanische Bearbeitung von Wäschestücken in einer mit einer Trommel ausgestatteten Waschmaschine wird vor allem durch ein zyklisch wiederholtes Anheben der Wäschestücke über in der Trommel angeordnete Wäschemitnehmer und Herunterfallen der Wäschestücke von diesen während des Drehens der Trommel gewährleistet (Wäschefall). Dabei wird im Allgemeinen über die Einstellung einer Drehzahl der Trommel eine optimale so genannte Abwurfparabel bestimmt. Der Eintrag von mechanischer Energie wird bei einem Durchmesser der Trommel einer gegenwärtig in Europa üblichen Frontlader-Waschmaschine bei etwa 50 Umdrehungen pro Minute erreicht. Über die Gestaltung eines Reversierrhythmus, d.h. ein zyklisch wiederholtes Umschalten der Drehrichtung der Trommel, kann die mechanische Bearbeitung beim Waschen in einem weiten Bereich variiert und eingestellt werden.The mechanical processing of laundry items in a washing machine equipped with a drum is mainly ensured by a cyclically repeated lifting of the laundry items in the drum arranged Wäschemitnehmer and falling down the laundry items of these during the rotation of the drum (laundry case). In this case, an optimal so-called discharge parabola is generally determined by setting a rotational speed of the drum. The input of mechanical energy is achieved at a diameter of the drum of a front loader washing machine currently in use in Europe at about 50 revolutions per minute. On the design of a reversing rhythm, i. a cyclically repeated switching the direction of rotation of the drum, the mechanical processing during washing can be varied and adjusted in a wide range.

Beim Waschen problematisch sind insbesondere Wäschestücke, die auf mechanische Bearbeitung empfindlich reagieren, wie Wäschestücke aus hochwertigen Textilien wie Wolle, Seide und Tüll. Der Wäschefall solcher Wäschestücke sollte insbesondere bei einem großen Durchmesser der Trommel minimiert werden. Deshalb wird ein solches Wäschestück während der Waschphase kaum bewegt und teilweise nur durch die Waschflotte durchgezogen, indem die Trommel nicht vollständig gedreht wird. Man spricht hier auch von einer Wolleschaukel oder Wollewiege. Hierbei wird jedoch aufgrund der stark eingeschränkten Bewegung des Wäschestücks keine ausreichende Waschperformance erreicht.Washing is particularly problematic with items of laundry that are sensitive to mechanical processing, such as items of laundry made of high-quality textiles such as wool, silk and tulle. The laundry case of such laundry should be minimized, especially with a large diameter of the drum. Therefore, such a laundry item is hardly moved during the washing phase and partially pulled through only by the wash liquor by the drum is not completely rotated. This is also referred to as a wool swing or wool cradle. In this case, however, due to the greatly restricted movement of the laundry no adequate washing performance is achieved.

Die DE 196 24 637 A1 beschreibt ein Verfahren zum maschinellen Waschen von Textilien, insbesondere von hochwertigen Textilien, bei Temperaturen von maximal 60°C, bei dem

  1. a) die Waschmaschine mit den Textilien beladen wird,
  2. b) durch Einsatz eines pulverförmigen bis granularen Waschmittels mit einem Schüttgewicht von 300 bis 1000 g/l über eine Einspülvorrichtung der Waschmaschine oder eine Dosierhilfe in einer Konzentration von 2,5 bis 8 g/l in der Waschflotte ein Schaum erzeugt wird, der, gemessen nach der an sich bekannten SSF-Methode, die nachfolgenden Stabilitätskriterien erfüllt:
    1. (i) es treten bei Proben im Anwendungskonzentrationsbereich von 2,5 bis 8 g/I (Wasserhärte 16°d, Temperatur 16°C) keine Hohlräume in der Schaumsäule auf und
    2. (ii) die Schaumsäule weist nach 120 Sekunden Aufschäumzeit eine Höhe von mindestens 30 cm, aber maximal 40 cm auf und
    3. (iii) die theoretische Schaumhöhe nach Auflegen eines 50 g-Gewichts beträgt nicht weniger als 28 cm, wobei die Differenz zwischen der maximalen Schaumhöhe nach 120 Sekunden Aufschäumzeit und der theoretischen Schaumhöhe weniger als 4,3 cm beträgt und/oder
    4. (iv) die Abnahme der Schaumhöhe pro Zeiteinheit beträgt nach der Gewichtsauflage weniger als 2 cm pro Minute;
  3. c) und die Textilien in diesem Schaum schonend gewaschen werden.
The DE 196 24 637 A1 describes a method for machine washing of textiles, in particular of high-quality textiles, at temperatures of maximum 60 ° C, in which
  1. a) the washing machine is loaded with the textiles,
  2. b) by using a powdered to granular detergent with a bulk density of 300 to 1000 g / l via a dispenser of the washing machine or a dosing aid in a concentration of 2.5 to 8 g / l in the wash liquor a foam is produced which, measured according to the SSF method known per se, fulfills the following stability criteria:
    1. (i) there are no voids in the foam column for samples in the application concentration range of 2.5 to 8 g / l (water hardness 16 ° d, temperature 16 ° C)
    2. (ii) the foam column has a height of at least 30 cm, but not more than 40 cm, after a foaming time of 120 seconds
    3. (iii) the theoretical foam height after application of a 50 g weight is not less than 28 cm, the difference between the maximum foam height after 120 seconds foaming time and the theoretical foam height being less than 4.3 cm and / or
    4. (iv) the decrease in foam height per unit time after weight application is less than 2 cm per minute;
  3. c) and the textiles are gently washed in this foam.

Die DE 35 28 253 A1 offenbart ein Verfahren und eine Vorrichtung zum Waschen von Wäsche, insbesondere ein Verfahren zum Waschen von Wäsche in einer Waschmaschine unter Einführen von Raumluft in die Wasch- und/oder Spüllauge sowie eine Waschmaschine mit einer drehbaren Trommel und einem Gebläse, einer über den höchsten erreichbaren Wasserstand hinaus geführten Luftleitung und einem entlang des Bodens des Laugenbehälters angeordneten Düsenstock. Über ein Gebläse wird Raumluft in den Laugenbehälter eingepresst, wobei diese Raumluft durch die Löcher in der Waschtrommel in diese hineingelangt.The DE 35 28 253 A1 discloses a method and a device for washing laundry, in particular a method for washing laundry in a washing machine while introducing room air into the washing and / or rinsing eye and a washing machine with a rotatable drum and a fan, one above the highest achievable water level In addition, guided air duct and arranged along the bottom of the tub nozzle. Room air is pressed into the tub by means of a blower, this room air coming in through the holes in the wash drum.

Die DE 29 07 562 A1 beschreibt ein Verfahren zum Erhöhen der Reinigungswirkung von Waschmaschinen sowie Waschmaschinen zur Durchführung des Verfahrens. Insbesondere wird ein Verfahren zum Erhöhen der Reinigungswirkung von Trommelwaschmaschinen offenbart, bei dem die Wäsche in einer Lauge mechanisch bewegt wird und der Lauge in niederfrequente Schwingungen versetzte Luft fein zerteilt zugeführt wird. Eine Waschmaschine zur Durchführung dieses Verfahrens hat einen in einem Gehäuse angeordneten Laugenbehälter und Einrichtungen zum Bewegen der Wäsche innerhalb des Laugenbehälters, wobei im Gehäuse eine Membranluftpumpe gelagert ist, die über ein mechanische Schwingungen übertragungsfähiges Rohr Luft durch wenigstens einen die Luft fein verteilenden Düsenkopf fördert, der im Innenraum des Laugenbehälters unterhalb des Laugenspiegels angeordnet ist.The DE 29 07 562 A1 describes a method for increasing the cleaning efficiency of washing machines and washing machines for carrying out the method. In particular, a method for increasing the cleaning effect of drum washing machines is disclosed, in which the laundry is mechanically moved in a liquor and the liquor is added finely divided into low-frequency vibrations offset air. A washing machine for carrying out this method has a tub disposed in a housing and means for moving the laundry within the tub, wherein in the housing a diaphragm air pump is mounted, the air via a mechanical vibrations transferable tube promotes by at least one nozzle head which distributes the air finely, which is arranged in the interior of the tub below the lye level.

Die US 5 295 373 A offenbart ein Verfahren gemäß dem Merkmalen des Oberbegriffs von Anspruch 1.The US 5 295 373 A discloses a method according to the features of the preamble of claim 1.

Aufgabe der vorliegenden Erfindung ist daher die Bereitstellung eines Verfahrens zur schonenden Behandlung von Wäsche, bei der bzw. dem die Auswirkungen der Mechanik des Waschvorgangs gering sind, wobei die Waschmaschine und das Verfahren insbesondere zur Behandlung von empfindlichen Wäschestücken aus hochwertigen Textilien wie Wolle, Seide oder Tüll geeignet sind.The object of the present invention is therefore to provide a method for the gentle treatment of laundry, in which the effects of the mechanics of the washing process are low, the washing machine and the method especially for the treatment of delicate laundry items from high-quality textiles such as wool, silk or Tulle are suitable.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Verfahren zur Behandlung von Wäschestücken gemäß den Merkmalen des Anspruchs 1.According to the invention, this object is achieved by a method for the treatment of items of laundry according to the features of claim 1.

Bevorzugte Ausgestaltungen der Erfindung sind in den jeweils abhängigen Patentansprüchen aufgeführt. Bevorzugten Ausgestaltungen der Waschmaschine entsprechen bevorzugte Ausgestaltungen des Verfahrens, auch wenn hierin darauf nicht jeweils einzeln hingewiesen wird.Preferred embodiments of the invention are listed in the respective dependent claims. Preferred embodiments of the washing machine correspond to preferred embodiments of the method, even if it is not individually referred to herein.

Hierbei liegt der Ausgang der Vorrichtung zur Eintragung von Luft vorzugsweise in einem unteren Bereich zwischen der Trommel und dem Laugenbehälter. Im Sinne der Erfindung bedeutet "unterer Bereich zwischen der Trommel und dem Laugenbehälter" vorzugsweise den Bereich zwischen der Trommel und dem Laugenbehälter, der durch die Waschlauge ausgefüllt wird, wenn diese im Laugenbehälter in einer Menge vorliegt, die ausreicht, um das untere Ende der Trommel zu berühren.In this case, the outlet of the device for introducing air preferably lies in a lower region between the drum and the tub. For the purposes of the invention, "lower area between the drum and the tub" preferably means the area between the drum and the tub that passes through the wash liquor when it is present in the tub in an amount sufficient to contact the lower end of the drum.

Die Geometrie des Schaums kann über die konstruktive Gestaltung eines Ausströmers am Ausgang der Vorrichtung zur Eintragung von Luft optimiert werden, wobei eine Porengröße zwischen einem feinporigen und einem grobporigen Schaum eingestellt wird. Ein feinporiger Schaum hat im Allgemeinen eine bessere Reinigungswirkung, da er leichter in Wäsche eindringen kann.The geometry of the foam can be optimized via the structural design of an outflow at the outlet of the device for introducing air, wherein a pore size between a fine-pored and a coarse-pored foam is adjusted. A fine-pored foam generally has a better cleaning effect, as it can easily penetrate into laundry.

In einer weiter bevorzugten Ausführungsform der erfindungsgemäßen Waschmaschine ist eine zusätzliche strukturelle Ausprägung der Trommel vorgesehen, welche zur Unterstützung einer Bildung von Schaum vorgesehen ist. Dabei handelt es sich vorzugsweise um einen Wäschemitnehmer, der in Hinblick auf die Eintragung von Luft optimiert ist. Es versteht sich, dass eine Mehrzahl oder Vielzahl solcher Wäschemitnehmer, insbesondere eine Zahl von drei oder vier, weiter bevorzugt ist.In a further preferred embodiment of the washing machine according to the invention an additional structural expression of the drum is provided, which is provided to support a formation of foam. This is preferably a Wäschemitnehmer, which is optimized with regard to the entry of air. It is understood that a plurality or multiplicity of such laundry carriers, in particular a number of three or four, is more preferred.

Der vorgenannte Wäschemitnehmer kann als integraler Bestandteil in die Trommel eingeformt oder als zusätzliches Bauteil in die Trommel eingesetzt sein. Er steht auch als Repräsentant für eine Vielzahl von Ausführungsformen für die strukturelle Ausprägung, welche insbesondere auch als Anordnung besonderer Rippen oder als schraubenförmig gewundene Ausprägung eines inneren Teils der Trommel denkbar ist.The aforementioned Wäschemitnehmer can be molded as an integral part of the drum or used as an additional component in the drum. He also represents a variety of embodiments for the structural expression, which is conceivable in particular as an arrangement of special ribs or as a helically wound expression of an inner part of the drum.

Die Vorrichtung zur Eintragung von Luft in die Waschlauge ist durch eine entsprechende Regelstrecke, welche insbesondere eine Steuereinrichtung der Waschmaschine umfasst, regelbar. Damit ist eine regelbare Eintragung von Luft in die Waschlauge möglich. Neben der Möglichkeit einer konstanten Lufteintragung, die lediglich ein- und ausschaltbar ist, kann dabei eine kontinuierliche oder stufenweise Variation der Menge an eingetragener Luft vorgesehen sein.The device for introducing air into the wash liquor is controllable by a corresponding controlled system, which in particular comprises a control device of the washing machine. This allows a controllable entry of air into the wash liquor. In addition to the possibility of a constant air entry, which can only be switched on and off, a continuous or stepwise variation of the amount of registered air can be provided.

Im Allgemeinen weist eine Waschmaschine Schaltmittel zum Drehen und Anhalten der Trommel auf. Überdies weist eine erfindungsgemäße Waschmaschine vorzugsweise einen Sensor zur Bestimmung einer Menge einer im Laugenbehälter befindlichen Flüssigkeit oder eines Schaums als Bestandteil der genannten Regelstrecke auf.In general, a washing machine has switching means for rotating and stopping the drum. Moreover, a washing machine according to the invention preferably has a sensor for determining a quantity of a liquid or foam present in the tub as part of the said controlled system.

Die Füllung der Trommel mit Schaum kann durch einen geeigneten Sensor bestimmt werden. Als Sensor zur Bestimmung der Menge einer im Laugenbehälter befindlichen Flüssigkeit oder eines Schaums, dessen Sensorsignal während des Verfahrens verfolgt wird, kann ein üblicher Sensor für die Bestimmung des Wasserstands verwendet werden. Ein solcher Sensor misst im Allgemeinen einen hydrostatischen Druck p und/oder einen zeitlichen Gradienten (Δp/Δt)1 des hydrostatischen Druckes p. Die Füllung mit Schaum zeigt sich im Allgemeinen an einer plötzlichen Druckzunahme am Sensor.The filling of the drum with foam can be determined by a suitable sensor. As a sensor for determining the amount of a liquid in the tub or a foam whose sensor signal is tracked during the process, a conventional sensor can be used for the determination of the water level. Such a sensor generally measures a hydrostatic pressure p and / or a time gradient (Δp / Δt) 1 of the hydrostatic pressure p. The foam filling is generally indicated by a sudden pressure increase at the sensor.

Ein Vorteil der Erfindung beruht darauf, dass der Wäschefall durch eine Verkürzung des Fallweges für die Wäschestücke begrenzt wird. Der innere Bereich der Trommel ist beim Behandeln von Wäschestücken mit Schaum zum großen Teil mit Schaum gefüllt. Beim Rotieren der Trommel fallen die Wäschestücke daher direkt in den aufgebauten Schaum. Dadurch wird der Fallweg verringert und die kinetische Energie der Wäschestücke beim Auftreffen auf den Schaum auf schonende Weise in die Verformung bzw. Bewegung und Erwärmung des Schaums umgesetzt. Die überraschend verbesserte Reinigungswirkung lässt sich über die Erhöhung der relativen Bewegung zwischen Schaum und Wäschestück erklären. Diese führt zu einer Verbesserung beim Lösen und Abtragen von Verunreinigungen im Wäschestück.An advantage of the invention is based on the fact that the laundry case is limited by a shortening of the fall path for the laundry items. The inner portion of the drum is filled with foam when treating laundry with foam for the most part. When rotating the drum, the laundry items therefore fall directly into the built foam. As a result, the fall path is reduced and the kinetic energy of the laundry items when hitting the foam in a gentle manner in the deformation or movement and heating of the foam implemented. The surprisingly improved cleaning effect can be explained by the increase in the relative movement between the foam and the laundry. This leads to an improvement in the dissolution and removal of impurities in the laundry.

Die Erfindung betrifft außerdem ein Verfahren zur insbesondere schonenden Behandlung von Wäsche mit einem Schaum aus einer Waschlauge in einer Waschmaschine mit einer in einem Laugenbehälter drehbar gelagerten Trommel, einem am Boden des Laugenbehälters angeordneten Laugenablaufsystem, einem Antriebsmotor für die Trommel, einer Heizeinrichtung und einer unabhängig von der Trommel schaltbaren Vorrichtung zur Eintragung von Luft in die Waschlauge, wobei der Schaum über die Eintragung von Luft in die Waschlauge mittels der Vorrichtung erzeugt wird, die Vorrichtung eine Luft-Kompressorpumpe ist und die Luft-Kompressorpumpe über einen in einem unteren Bereich zwischen der Trommel und dem Laugenbehälter liegenden Ausgang Luft in die Waschlauge einträgt.The invention also relates to a method for particularly gentle treatment of laundry with a foam from a wash liquor in a washing machine with a rotatably mounted in a tub drum, a bottom of the tub arranged lye drain system, a drive motor for the drum, a heater and independent of the drum switchable device for introducing air into the wash liquor, wherein the foam is generated by the entry of air into the wash liquor by means of the device, the device is an air compressor pump and the air compressor pump via a in a lower region between the drum and the outlet located in the tub enters air into the wash liquor.

Beim erfindungsgemäßen Verfahren füllt der Schaum im Allgemeinen einen großen Teil des Inneren der Trommel aus. Vorzugsweise wird bei diesem Verfahren der Schaum in einer Menge erzeugt, die ausreicht, dass der Schaum in der Trommel in einer Höhe von 1/3 bis 2/3 eines inneren Durchmessers der Trommel vorliegt.In the method according to the invention, the foam generally fills a large part of the interior of the drum. Preferably, in this method, the foam is produced in an amount sufficient to provide the foam in the drum at a height of 1/3 to 2/3 of an inner diameter of the drum.

Das erfindungsgemäße Verfahren funktioniert besonders gut, wenn die Waschlauge ein Waschmittel aufweist, das einen stabilen Schaum ergeben kann. Ein geeignetes Waschmittel ist beispielsweise in der DE 196 24 637 A1 beschrieben.The process of the invention works particularly well when the wash liquor has a detergent which can give a stable foam. A suitable detergent is for example in the DE 196 24 637 A1 described.

Vorzugsweise wird ein Waschmittel verwendet, das die Bildung von Schaumblasen ermöglicht, deren Durchmesser kleiner ist als der Durchmesser von Öffnungen in der Trommel und/oder den darin befindlichen Wäschemitnehmern.Preferably, a detergent is used which allows the formation of foam bubbles, whose diameter is smaller than the diameter of openings in the drum and / or therein Wäschemitnehmern.

Vorzugsweise wird das erfindungsgemäße Verfahren in einer Waschmaschine durchgeführt, deren Wäschemitnehmer und/oder das Innere der Trommel Öffnungen aufweisen, die größer als der Durchmesser der mit einem Waschmittel erzeugten Schaumblasen sind. Hierbei ist es wiederum bevorzugt, dass die Öffnungen deutlich größer als die Durchmesser der erzeugten Schaumblasen sind.Preferably, the method according to the invention is carried out in a washing machine whose Wäschemitnehmer and / or the interior of the drum have openings which are larger than the diameter of the foam bubbles generated with a detergent. In this case, it is again preferred that the openings are significantly larger than the diameters of the foam bubbles produced.

Die Erzeugung von Schaum kann erfolgen, wenn die Trommel still steht. Vorzugsweise wird die Trommel für eine rasche Erzeugung eines Schaums und dessen gute Verteilung innerhalb der Trommel mit einer geeigneten Drehzahl U2 gedreht, wobei vorteilhaft die Drehrichtung gewechselt werden kann.The generation of foam can take place when the drum is stationary. Preferably, the drum is rotated for rapid production of a foam and its good distribution within the drum at a suitable speed U 2 , wherein advantageously the direction of rotation can be changed.

Die Drehzahl U2 kann in weiten Bereichen variieren. Erfindungsgemäß wird eine Drehzahl U2 im Bereich von 30 bis 80, insbesondere 40 bis 60, zum Beispiel 50 Umdrehungen pro Minute verwendet. Hierbei wird durch das Walken und Reiben der Wäschestücke aneinander sowie die Einwirkung des Schaums der vorhandene Schmutz von den Fasern abgelöst.The speed U 2 can vary within wide ranges. According to the invention, a rotational speed U 2 in the range of 30 to 80, in particular 40 to 60, for example 50 revolutions per minute is used. Here, by the walking and rubbing of the laundry items together and the action of the foam, the existing dirt is detached from the fibers.

Die Erzeugung von Schaum kann bei Raumtemperatur erfolgen. Vorzugsweise wird das erfindungsgemäße Verfahren jedoch mit einer erwärmten Waschlauge und/oder unter Erwärmen der Waschlauge durchgeführt.The generation of foam can be done at room temperature. Preferably, however, the process according to the invention is carried out with a heated wash liquor and / or with heating of the wash liquor.

Beim erfindungsgemäßen Verfahren sind die Wäschestücke vorteilhafterweise komplett in den Schaum eingebettet.In the method according to the invention, the items of laundry are advantageously completely embedded in the foam.

Erfindungsgemäße Verfahren haben deutliche Vorteile. Die Schonung von empfindlichen Wäschestücken wie solchen aus Wolle, Seide oder Tüll in einem Waschverfahren ist deutlich verbessert. Außerdem wird die Waschleistung verbessert, so dass bei ansonsten gleichem Ablauf eines Waschprogramms eine verbesserte Waschwirkung erzielt wird.Inventive methods have clear advantages. The protection of delicate items such as wool, silk or tulle in a washing process is significantly improved. In addition, the washing performance is improved, so that in otherwise the same sequence of a wash program, an improved washing effect is achieved.

Die Erfindung wird im Folgenden anhand des in Figur 1 dargestellten Ausführungsbeispiels näher illustriert.The invention will be described below with reference to the in FIG. 1 illustrated embodiment illustrated in more detail.

Figur 1 ist eine schematische Darstellung der für die Illustrierung relevanten Teile einer Waschmaschine, in der ein erfindungsgemäßes Verfahren durchgeführt werden kann. Andere Ausführungsformen sind denkbar. FIG. 1 is a schematic representation of the relevant parts for illustration of a washing machine in which a method according to the invention can be carried out. Other embodiments are conceivable.

Die Waschmaschine der in Figur 1 gezeigten Ausführungsform weist einen Laugenbehälter 1 auf, in dem eine Trommel 2 drehbar gelagert und durch einen Antriebsmotor 14 betrieben werden kann. Die Drehachse 3 der Trommel 2 ist um einen kleinen Winkel (z.B. 13°) aus der Horizontalen nach vorne oben gerichtet, so dass man einen leichteren Zugang und Einblick in das Innere der Trommel 2 hat. Durch diese Anordnung wird im Zusammenwirken mit besonders geformten Wäschemitnehmern 4 und Schöpfeinrichtungen 5 für die Waschlauge 6 an der Innenfläche des Trommelmantels außerdem auch eine Intensivierung der Durchflutung der Wäsche 7 mit Schaum erreicht.The washing machine of the FIG. 1 embodiment shown has a tub 1, in which a drum 2 rotatably mounted and operated by a drive motor 14. The axis of rotation 3 of the drum 2 is directed at a small angle (eg 13 °) from the horizontal to the front upwards, so that one has easier access and insight into the interior of the drum 2. By this arrangement, in conjunction with specially shaped Wäschemitnehmern 4 and 5 Schöpfeinrichtungen for the wash liquor 6 on the inner surface of the drum shell also also an intensification of the flooding of the laundry 7 is achieved with foam.

Die Waschmaschine weist zudem ein Laugenzulaufsystem auf, das eine Wasseranschlussarmatur für das Hauswassernetz 8, ein elektrisch steuerbares Ventil 9 und eine Zuleitung 10 zum Laugenbehälter 1 umfasst, die gegebenenfalls auch über eine Waschmitteleinspüleinrichtung ("Einspülschale") 11 geführt sein kann, aus der das Zulaufwasser Waschmittelportionen in den Laugenbehälter 1 transportieren kann. Außerdem befindet sich im Laugenbehälter 1 eine Heizeinrichtung 13. Das Ventil 9 wie auch die Heizeinrichtung 13 werden durch eine Steuereinrichtung ("Programmsteuerung") 12 in Abhängigkeit von einem Programmablaufplan gesteuert, der an ein Zeitprogramm und/oder an das Erreichen von gewissen Messwerten von Parametern wie Laugenniveau, Schaumniveau, Laugentemperatur, Drehzahl der Trommel 2 usw. innerhalb der Waschmaschine gebunden ist. Ein Sensor 15 für die Messung des hydrostatischen Druckes p im Laugenbehälter 1 ist vorgesehen.The washing machine also has a liquor inlet system comprising a water connection fitting for the domestic water network 8, an electrically controllable valve 9 and a supply line 10 to the tub 1, which may optionally also be guided via a Waschmitteleinspüleinrichtung ("Einspülschale") 11, from which the feed water Can carry detergent portions in the tub 1. In addition, in the tub 1, a heater 13. The valve 9 as well as the heater 13 are controlled by a control device ("program control") 12 in response to a program flowchart, the time program and / or the achievement of certain measured values of parameters as alkali level, foam level, liquor temperature, speed of the drum 2, etc. is bound within the washing machine. A sensor 15 for the measurement of the hydrostatic pressure p in the tub 1 is provided.

Ein Laugenablaufsystem 20, welches gemäß herkömmlicher Praxis neben entsprechenden Leitungen ein Ablaufventil sowie eine Laugenpumpe umfasst, ist der Übersicht halber nur schematisch dargestellt.A lye drainage system 20, which according to conventional practice in addition to corresponding lines a drain valve and a drain pump includes is shown for clarity only schematically.

Als Vorrichtung 16 zur Eintragung von Luft in die Waschlauge ist in der Ausführungsform von Figur 1 eine Kombination mit einer Luft-Kompressorpumpe 17 gezeigt, deren Ausgang 18 in einen unteren Bereich 19 zwischen der Trommel 2 und dem Laugenbehälter 1 ragt.As a device 16 for entry of air into the wash liquor is in the embodiment of FIG. 1 shown a combination with an air compressor pump 17, the output 18 in a lower portion 19 between the drum 2 and the tub 1 protrudes.

Die Wäschemitnehmer 4 sind als zusätzliche strukturelle Ausprägungen der Trommel 2 optimiert zur Unterstützung einer Bildung von Schaum, wie weiter oben eingehend beschrieben ist.The Wäschemitnehmer 4 are optimized as additional structural features of the drum 2 to support a formation of foam, as described in detail above.

In dieser Waschmaschine können Wäschestücke aus hochwertigen Textilien schonend mittels Schaum gereinigt werden, wobei Verfahrensmerkmale und -parameter zum Einsatz kommen, welche weiter oben erläutert sind, worauf hier statt einer Wiederholung Bezug genommen wird.In this washing machine laundry items made of high-quality textiles can be gently cleaned by means of foam, using process features and parameters, which are explained above, which will be referred to here instead of a repetition.

Eine Regelung der Bildung von Schaum erfolgt über eine Regelstrecke umfassend den Sensor 15 und die Steuereinrichtung 12, so dass, sei es durch wechselndes Ein- und Ausschalten der Kompressorpumpe 17 oder eine Variation ihrer Leistung, die Menge des zur Behandlung der Textilien verfügbaren Schaums kontrolliert und insbesondere auch begrenzt wird.A regulation of the formation of foam takes place via a controlled system comprising the sensor 15 and the control device 12, so that, whether by alternating switching on and off of the compressor pump 17 or a variation of their performance, the amount of foam available for the treatment of the textiles is controlled and especially limited.

Claims (5)

  1. Method for treatment of articles of laundry with a foam from a washing solution in a washing machine with a drum (2) horizontally rotatably mounted in a solution container (1), a solution drain system (20) arranged at the base of the solution container (1), a drive motor (14) for the drum (2), a heating device (13) and a device (16), which is switchable independently of the drum (2), for induction of air into the washing solution in a lower region between the drum (2) and the solution container (1), wherein the device (16) can be regulated by way of a regulating path (9, 12, 15), characterised by
    a) producing foam by way of the induction of air into the washing solution by means of the device (16), which is an air compressor pump (17) with an outlet (18) to the solution container (1),
    b) regulating the formation of foam by way of the regulating path (9, 12, 15) so that the foam is present in an amount by which the drum (2) is for the major part filled with foam and the articles of laundry fall directly into the foam during rotation of the drum; and
    c) rotating the drum (2) at a rotational speed U2 in a range of 30 to 80 revolutions per minute, wherein step c) can be carried out after a) and b) or simultaneously with a) and b).
  2. Method according to claim 1, characterised in that regulation of formation of foam is carried out in such a manner that the foam is present in an amount sufficient for the foam to be present in the drum (2) to a height of 1/3 to 2/3 of an inner diameter of the drum (2).
  3. Method according to claim 1 or 2, characterised in that regulation of formation of foam is carried out in such a manner that the foam is present in an amount sufficient for the articles of laundry to be completely embedded in the foam.
  4. Method according to one of claims 1 and 2, characterised in that the method is performed with a heated washing solution.
  5. Method according to any one of claims 1 to 4, characterised in that the rotation of the drum (2) is carried out with an alternating direction of rotation.
EP10186275.3A 2007-06-20 2008-06-11 Washing machine and process for treating laundry with foam Active EP2312036B1 (en)

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EP2158349B1 (en) 2013-02-13
CN101711294A (en) 2010-05-19
US20100242184A1 (en) 2010-09-30
CN102535097B (en) 2016-08-24
EA201070017A1 (en) 2010-06-30
PL2312036T3 (en) 2014-10-31
US9926660B2 (en) 2018-03-27
EA017720B1 (en) 2013-02-28
CN101711294B (en) 2012-03-21
DE102007028213A1 (en) 2008-12-24
EP2312036A1 (en) 2011-04-20
WO2008155272A1 (en) 2008-12-24
EA021320B1 (en) 2015-05-29
CN102535097A (en) 2012-07-04
EP2158349A1 (en) 2010-03-03
EA201270668A1 (en) 2012-12-28

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