EP2792779B1 - Verfahren zum Waschen von Wäsche in einer Sprühwaschmaschine - Google Patents

Verfahren zum Waschen von Wäsche in einer Sprühwaschmaschine Download PDF

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Publication number
EP2792779B1
EP2792779B1 EP13164308.2A EP13164308A EP2792779B1 EP 2792779 B1 EP2792779 B1 EP 2792779B1 EP 13164308 A EP13164308 A EP 13164308A EP 2792779 B1 EP2792779 B1 EP 2792779B1
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EP
European Patent Office
Prior art keywords
heating device
water
laundry
drum
tub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP13164308.2A
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English (en)
French (fr)
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EP2792779A1 (de
Inventor
Sylvia Guzman
Claudio Civanelli
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Whirlpool Corp
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Whirlpool Corp
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Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Priority to PL13164308T priority Critical patent/PL2792779T3/pl
Priority to EP13164308.2A priority patent/EP2792779B1/de
Priority to US14/250,746 priority patent/US20140310885A1/en
Publication of EP2792779A1 publication Critical patent/EP2792779A1/de
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Classifications

    • 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

Definitions

  • the present invention relates to a method for washing laundry in a horizontal axis washing machine comprising a drum rotatably mounted in a tub, a recirculation pump for recirculating a washing liquid on the laundry and a heating device placed in the tub for heating washing liquid.
  • So called "jet” or “spray” washing machines are well known in which the washing liquor is sprayed onto the laundry while the drum is rotated at a predetermined tumbling speed or spinning speed.
  • the main advantage of such known washing method is an increase of washing efficiency due to the high detergent concentration and the overall reduction of water amount.
  • Document EP 1 961 854 A1 discusses the problem of having a predetermined heater safety water level, and solves it with the provision of a control unit that supplies the water in the water through the circulation unit to wet laundry after the supply of a predetermined amount of wash water, rotates the rotary drum at the minimum RPM at which the laundry may be spin-dried to squeeze out water from the laundry, and detects the water level of the squeezed water.
  • the control unit controls the motor, the heater, the water supply unit and the circulation unit such that, when the detected water level is below a predetermined heater safety water level, water is supplied through the water supply unit until the water level reaches the heater safety water level, and, when the detected water level reaches the predetermined heater safety water level, water is heated by activating the washing heater until the temperature of the water reaches a target temperature, and the heated water is resupplied into the rotary drum.
  • the present invention it is possible to increase water level in the tub so that heater can be switched on without safety problems (entire heater submerged). Water already warmed can be distributed efficiently by recirculating it directly onto the laundry. According to a preferred feature of the invention, an increase of water level up to 20 mm is obtained in the tub so that heater can be safely switched on.
  • One of the main feature of the invention is the application of a low speed spinning sufficiently high to generate a centrifugal force which forms and maintains at least partially an annular layer of clothes against the drum wall to free water from laundry and to increase water level in the wash tub.
  • a low speed spinning phase which can be defined also as a high speed tumbling phase
  • water recirculation is interrupted.
  • water heating in the tub is carried out preferably with a slow motion movement (tumbling).
  • Such water heating is preferably carried out for a predetermined period of time (and not on the basis of a temperature feedback). This predetermined time is set on the basis of the total energy which has to be transferred to the laundry (as it will be clear in the following detailed description).
  • Temperature in the sump of the tub is therefore not monitored (a part from its sensing for safety reasons).
  • the drum is rotated again at a low spinning speed during which water already warmed is recirculated directly to the laundry.
  • a spray washing machine having a tub 12, a rotating drum 14 inside the tub 12 and driven by a motor 16, an electric heater 18 in the lower portion of the tub 12, a recirculation conduit 20 provided with a circulation pump 22 and a spray nozzle 24 for spraying washing liquid onto the laundry L.
  • washing liquid we mean either water or a mixture of water plus detergents or the like.
  • the washing machine has other components, as the drain pump, possible water storage tank, detergent distributors, water level sensors etc. but these will not be described in the following since they are not specifically related to the invention.
  • the heater 18, the motor 16 and the pump 22 are electrically connected to a control unit 26 which drives all such components according to a predetermined sequence.
  • a general advantage of using a recirculation system as shown in figure 1 is an improvement of the cleaning performances, for instance when such performances are tested according to the "red wine stain" standard procedure. Such advantage in cleaning performances is mainly due to a higher concentration of detergent.
  • the slow spin phase S at a speed preferably comprised between 80 and 120 rpm, and more preferably around 100 rpm, is carried out after detergent is added in the tub 12.
  • the method according to the invention can be carried out by adding detergent at the end of the heating phase, or at any time during the heating phase.
  • the overall duration of the spinning phase S is preferably comprised between 10 and 50 s, more preferably between 20 and 40 s.
  • control unit 26 of the washing machine 10 is running an algorithm for assessing the heating time after the slow spin phase S.
  • the first step of such algorithm is the measure of ambient temperature T1 by means of a NTC temperature sensor 15 placed in the tub. Such measure is carried out before feeding any water in the tub. This temperature is also assumed to be the temperature of the laundry dry load L. If a washing cycle has been recently terminated , the control unit 26 will assume as ambient temperature the T1 of the previous washing cycle.
  • Figures 5-7 show a comparison of the traditional spray washing cycle (dotted lines) and a washing cycle according to the invention (solid lines), and in which the same target temperature of laundry is used.
  • the applicant has discovered that in above condition, i.e. if it is desired to reach the same temperature of the laundry at the end of the heating phase, a lower energy is needed in the method according to the invention.
  • the applicant has measured an energy saving of at least 0,06 kWh for each washing cycle (this is shown in figure 7 ).
  • a horizontal axis washing machine is loaded with a cotton load Ml (thermal capacity 1,26 kJ/kg°C, specific absorption 2 I/kg).

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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)

Claims (15)

  1. Verfahren zum Waschen von Wäsche in einer Waschmaschine (10), vorzugsweise einer horizontal Achsen Waschmaschine, umfassend eine Trommel (14), die drehbar in einer Wanne (12) montiert ist, eine Umwälzpumpe (22) zum Umwälzen einer Waschflüssigkeit auf die Wäsche (L) und eine Heizvorrichtung (18) zum erhitzen der Waschflüssigkeit, dadurch gekennzeichnet, dass es das Erhöhen der Trommeldrehzahl auf eine vorbestimmte niedrige Schleuderdrehzahl (S), während die Umwälzpumpe (22) ausgeschaltet ist, um den Wasserpegel in der Wanne (12) zu erhöhen schaltet (W) und das Sicherstellen, dass die Heizvorrichtung (18) vollständig eingetaucht ist, und das Einschalten der Heizvorrichtung (18) umfasst.
  2. Verfahren nach Anspruch 1, wobei die Heizvorrichtung (18) für einen vorbestimmten Zeitraum eingeschaltet wird.
  3. Verfahren nach Anspruch 2, wobei der vorbestimmte Zeitraum auf der tatsächlichen Energie, die auf die Wäsche (L) übertragen werden soll, basiert.
  4. Verfahren nach Anspruch 3, wobei der Zeitraum nach der folgenden Formel berechnet wird: t = Ml * A + Mwl * Cw * Tt - T ⁢ 2 + ( Ml * Cl * Tt - T ⁢ 1 + Tt - T ⁢ 1 * k V 2 * R
    Figure imgb0014
    wobei MI = Masse der Wäsche in der Wanne;
    A = spezifische Absorption der Wäsche
    Mwl= Masse des freien Wassers
    Cw = thermische Kapazität des Wassers
    Tt = Zieltemperatur der Beladung + Wasser
    T2 = Temperatur des in die Wanne geladenen Wassers
    Cl = thermische Kapazität der Beladung
    T1 = Umgebungstemperatur
    K = Versuchskoeffizient zur Beseitigung des Hitzeverlustes
    R = Widerstand des Erhitzers in der Wanne
    V = Spannung des von dem Erhitzer verwendeten elektrischen Stroms
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei die niedrige Schleuderdrehzahl zwischen 80 und 120 Umdrehungen pro Minute liegt.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei die niedrige Schleuderdrehzahl (S) für eine Gesamtzeit zwischen 10 und 50 s beibehalten wird.
  7. Verfahren nach einem der vorhergehenden Ansprüche, wobei während der Phase, in der die Heizvorrichtung (18) eingeschaltet wird, die Trommel (14), zumindest zeitweise, bei einer Trommeldrehzahl (G), gedreht wird.
  8. Verfahren nach Anspruch 6, wobei die Trommeldrehzahl (G) zwischen 10 und 70 Umdrehungen pro Minute liegt.
  9. Methode nach einem der vorhergehenden Ansprüche, bei dem, nachdem die Heizvorrichtung (18) ausgeschaltet wird, die Trommel (14) mit einer zweiten niedrigen Schleuderdrehzahl (B) für einen vorbestimmten Zeitraum rotiert.
  10. Verfahren nach Anspruch 8, wobei die zweite niedrige Schleuderdrehzahl (B) im Wesentlichen identisch mit der ersten Schleuderdrehzahl (S) ist.
  11. Waschmaschine (10), vorzugsweise horizontal Achsen Waschmaschine, umfassend eine Trommel (14), die drehbar in einer Wanne (12) montiert ist, eine Umwälzpumpe (22) zum Umwälzen einer Waschflüssigkeit auf die Wäsche (L), einen Motor (16) zum Drehen der Trommel (14) und eine Heizvorrichtung (18) zum Erhitzen der Waschflüssigkeit, dadurch gekennzeichnet, dass sie eine Steuereinheit (26) umfasst, die angepasst ist, den Motor (16) anzutreiben um die Trommeldrehzahl auf eine vorbestimmte niedrige Schleuderdrehzahl (S) zu erhöhen, während die Umwälzpumpe (22) abgeschaltet wird, um den Wasserstand (W) in der Wanne (12) zu erhöhen, und sicher zu stellen, dass die Heizvorrichtung (18) vollständig eingetaucht ist und dann die Heizvorrichtung (18) einzuschalten.
  12. Waschmaschine nach Anspruch 11, wobei die Steuereinheit (26) angepasst ist, um die Heizvorrichtung (18) einen vorbestimmten Zeitraum anzutreiben.
  13. Waschmaschine nach Anspruch 12, wobei der vorbestimmte Zeitraum durch die Steuereinheit (26) auf der Basis der tatsächlich an die Wäsche (L) zu übertragenden Energie berechnet wird.
  14. Waschmaschine nach Anspruch 11, wobei die Steuereinheit (26) angepasst ist, die Trommel (14) zumindest zeitweise, bei einer Taumeldrehzahl (G) anzutreiben, während die Heizvorrichtung (18) eingeschaltet ist.
  15. Waschmaschine nach Anspruch 11, wobei die Steuereinheit (26) angepasst ist, den Motor (16) anzutreiben, nachdem Heizeinrichtung (18) ausgeschaltet ist, so dass die Trommel (14) bei einer zweiten niedrigen Schleuderdrehzahl (B) für einen vorbestimmten Zeitraum gedreht wird.
EP13164308.2A 2013-04-18 2013-04-18 Verfahren zum Waschen von Wäsche in einer Sprühwaschmaschine Revoked EP2792779B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL13164308T PL2792779T3 (pl) 2013-04-18 2013-04-18 Sposób prania w pralce natryskowej
EP13164308.2A EP2792779B1 (de) 2013-04-18 2013-04-18 Verfahren zum Waschen von Wäsche in einer Sprühwaschmaschine
US14/250,746 US20140310885A1 (en) 2013-04-18 2014-04-11 Method for washing laundry in a spray washing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13164308.2A EP2792779B1 (de) 2013-04-18 2013-04-18 Verfahren zum Waschen von Wäsche in einer Sprühwaschmaschine

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EP2792779A1 EP2792779A1 (de) 2014-10-22
EP2792779B1 true EP2792779B1 (de) 2015-09-30

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017211412A1 (en) * 2016-06-08 2017-12-14 Arcelik Anonim Sirketi Washer with an improved cleaning performance and an improved energy efficiency
DE102019209149A1 (de) * 2019-06-25 2020-12-31 BSH Hausgeräte GmbH Wäschepflegegerät mit einer Pumpvorrichtung und ein Verfahren zum Betreiben des Wäschepflegegeräts
KR20210004339A (ko) * 2019-07-04 2021-01-13 엘지전자 주식회사 세탁기의 제어방법

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0159204A1 (de) 1984-02-17 1985-10-23 Esswein S.A. Waschmaschine mit einem leicht über den Trommelboden reichenden Wasserstand
EP0182364A2 (de) 1984-11-20 1986-05-28 INDUSTRIE ZANUSSI S.p.A. Waschmaschine
US20070283510A1 (en) 2006-06-09 2007-12-13 Hoi Jin Jeong Washing machine and operating method thereof
EP1961854A1 (de) 2007-02-26 2008-08-27 Samsung Electronics Co., Ltd. Waschmaschine und Waschsteuerverfahren dafür
EP2161365A2 (de) 2008-09-09 2010-03-10 MIELE & CIE. KG Verfahren zum Betreiben einer Waschmaschine und Waschmaschine
EP2246469A1 (de) 2010-02-16 2010-11-03 V-Zug AG Washmaschine mit Zirkulationspumpe und Schleuderphase
US20120151689A1 (en) 2009-08-27 2012-06-21 Sang Il Hwang Control method of laundry machine
WO2013118999A1 (en) 2012-02-07 2013-08-15 Lg Electronics Inc. Controlling method of laundry device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100565251B1 (ko) * 2004-07-19 2006-03-30 엘지전자 주식회사 드럼세탁기의 절수세탁방법
US20070118997A1 (en) * 2005-08-23 2007-05-31 Choi Du H Washing machine
KR20090035898A (ko) * 2007-10-08 2009-04-13 엘지전자 주식회사 세탁장치의 세탁방법
US8713736B2 (en) * 2008-08-01 2014-05-06 Lg Electronics Inc. Control method of a laundry machine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0159204A1 (de) 1984-02-17 1985-10-23 Esswein S.A. Waschmaschine mit einem leicht über den Trommelboden reichenden Wasserstand
EP0182364A2 (de) 1984-11-20 1986-05-28 INDUSTRIE ZANUSSI S.p.A. Waschmaschine
US20070283510A1 (en) 2006-06-09 2007-12-13 Hoi Jin Jeong Washing machine and operating method thereof
EP1961854A1 (de) 2007-02-26 2008-08-27 Samsung Electronics Co., Ltd. Waschmaschine und Waschsteuerverfahren dafür
EP2161365A2 (de) 2008-09-09 2010-03-10 MIELE & CIE. KG Verfahren zum Betreiben einer Waschmaschine und Waschmaschine
US20120151689A1 (en) 2009-08-27 2012-06-21 Sang Il Hwang Control method of laundry machine
EP2246469A1 (de) 2010-02-16 2010-11-03 V-Zug AG Washmaschine mit Zirkulationspumpe und Schleuderphase
WO2013118999A1 (en) 2012-02-07 2013-08-15 Lg Electronics Inc. Controlling method of laundry device

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PL2792779T3 (pl) 2015-12-31
EP2792779A1 (de) 2014-10-22
US20140310885A1 (en) 2014-10-23

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