EP2604739B1 - Waschmaschine mit Rezirkulationspumpe - Google Patents

Waschmaschine mit Rezirkulationspumpe Download PDF

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Publication number
EP2604739B1
EP2604739B1 EP11193138.2A EP11193138A EP2604739B1 EP 2604739 B1 EP2604739 B1 EP 2604739B1 EP 11193138 A EP11193138 A EP 11193138A EP 2604739 B1 EP2604739 B1 EP 2604739B1
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EP
European Patent Office
Prior art keywords
tub
recirculation
water
washing machine
heater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11193138.2A
Other languages
English (en)
French (fr)
Other versions
EP2604739A1 (de
Inventor
Nicola Reid
Monica Celotto
Maurizio Del Pos
Daniele Favaro
Maurizio Ugel
Andrea Zattin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP11193138.2A priority Critical patent/EP2604739B1/de
Priority to PCT/EP2012/075116 priority patent/WO2013087642A1/en
Publication of EP2604739A1 publication Critical patent/EP2604739A1/de
Application granted granted Critical
Publication of EP2604739B1 publication Critical patent/EP2604739B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/40—Steam generating arrangements
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements

Definitions

  • the present invention relates to a water bearing appliance intended for washing and/or drying clothes, having an article treating chamber, where the clothes to be washed/dried are introduced, including a steam cycle.
  • said household appliance may be a washing machine, or a washer-dryer, that is a laundry washing machine with additional drying function.
  • a water bearing appliance e.g. a washing or a washing/drying machine
  • a water bearing appliance includes an article treating chamber rotatably supported within a cabinet and made to rotate by means of a driving device, typically including an electric motor connected to the article treating chamber e.g. via a belt.
  • such machine includes a rotating drum 3, for carrying out a washing, rotatably supported within a tub 2 situated within a cabinet or outer body (not shown in the Figure).
  • Water necessary to carry out the washing is derived from a main via a common supply pipe 4 and introduced into the tub 2 via washing water supply pipe 5, by opening of a first solenoid valve 21.
  • Water is loaded by the washing water supply pipe 5 into one compartment of the detergent drawer 6. The water then flows from the drawer into the tub reaching the sump 7, where it is heated by a heater 17.
  • Laundry is introduced into the drum through, for example, an aperture in the front wall of the body.
  • Some machines are also equipped with a recirculation circuit, including a recirculation pump 18 (RP) and a recirculation pipe 8.
  • RP recirculation pump 18
  • a pressure sensor 16 P
  • DP drain pump 15
  • the most recent washing machines provide also a steam cycle, during which steam is generated and ejected into the tub, thus reaching the laundry inside the drum.
  • This system has also the advantage of carrying out a sterilization of the laundry.
  • a heater is integrated to the tub and is used to heat up the water until steam is generated.
  • a washing machine adapted to generate and apply steam in order to enhance washing performance while enabling sterilization of laundry.
  • the washing machine includes a heater installed in the tub and a controller.
  • the controller operates the heater to heat the water contained in the tub to generate steam, rather than just warming the water.
  • the washing machine further comprises a water level sensor to detect a water level in the tub, and the controller operates the heater according to a detection result of the water level sensor.
  • the washing machine has an additional advantageous effect in that, due to the steam, the laundry is also sterilized. Other modifications were made in the attempt to save energy and simplify the washing machine configuration.
  • Patent application WO-A-2006/129913 discloses a method of controlling washing operation of a washing machine, which method comprises the steps of supplying water into a tub, soaking the laundry with water, and supplying steam by heating the water using a heater installed in the tub to generate the steam.
  • Patent application JP-A-04158896 discloses a fully automatic washing machine, in which a steam generating cycle is performed before a washing cycle to obtain good washing and sterilizing effect. A small quantity of supply water is introduced and heated in the tub before the washing cycle, in a manner not to wet the laundry and to produce steam that sterilizes the laundry and loosens the fibers thereof.
  • a laundry appliance wherein a nozzle is provided for introducing water and a device is provided for generating steam.
  • the device includes a tank, a heating element, an inlet opening and a common outlet for the water and steam, provided with a nozzle disposed in the edge region of the container opening. Apart from the outlet and the nozzle, the water injection circuit and the steam generating system have separated paths.
  • a washing machine which has a steam generator for producing and supplying steam to the tub.
  • a drum is rotated when the steam is supplied, so that the steam can be brought into contact with the laundry quickly and uniformly.
  • the washing machine can further include a recirculation pump for drawing water from the tub and return it to the tub again in a recirculation cycle.
  • the steam generation device and the recirculation pump are mounted into separated circuits, independent from each other and having in common an outlet with a nozzle.
  • Some washing machines beside the washing cycle also include a drying cycle, in which a drying process is carried out on the laundry using steam and/or an air circulation system, possibly including a condenser device to remove the water.
  • the drying air circulates in an air recirculation pipe connected to the tub.
  • a key parameter to save energy and water is to reduce the amount of water actually used to wash the laundry. Heating of the wetted load accounts for the major part of the energy consumption of a washing machine. Thus, by reducing the amount of water used during the main wash, less energy is required to heat up the contents of the drum.
  • a further object of the present invention is to provide a water bearing drying appliance (e.g. a washing machine, a tumble dryer or a washer-dryer, i.e. a laundry washing machine with additional drying function) which allows easy assembly and energy saving.
  • a water bearing drying appliance e.g. a washing machine, a tumble dryer or a washer-dryer, i.e. a laundry washing machine with additional drying function
  • Another object of the present invention is to propose a washing or washing-drying machine in which steam temperature losses are reduced, with a substantial energy saving, and in which the steam flow inside the drum is optimized.
  • Another object of the invention is to propose a washing or washing-drying machine with a more compact configuration, including a steam generating system which can be easily applied, with minimal changes, to standard washing machines and washing-dryer machines with concentrated wash and steam function.
  • the present disclosure provides a water bearing appliance as set out in the accompanying claims.
  • the present disclosure provides a washing machine including: a tub; a drum, rotatably supported inside the tub; a recirculation circuit including a recirculation pipe and a recirculation pump, the recirculation circuit being connected to the tub and adapted to convey inside the tub recirculation water taken from the tub, characterized in that the recirculation circuit comprises a steam generator for generating steam, which is conveyed into the tub through the recirculation circuit.
  • the recirculation circuit is adapted to move the water taken from a first opening in the tub and to convey the water back in the tub through a second opening.
  • the second opening is at a higher height in the tub compared to the first opening.
  • the steam generator includes a chamber and a heater situated within the chamber.
  • the steam generator is placed along the recirculation pipe, downstream of the recirculation pump, with the chamber connected to the recirculation pipe.
  • the steam generator is situated along the recirculation pipe, upstream of the recirculation pump, between the recirculation pump and a sump of the tub, with the chamber connected to the recirculation pipe.
  • the steam generator includes a heater integrated within the recirculation pump.
  • the recirculation pump is positioned at the level of the sump of the tub, so that water can partially cover the heater within the recirculation pump.
  • the heater features a thermostat aimed at interrupting the power supply when the temperature reaches a certain level due to the water level being too low to partially cover the heater.
  • the machine according to the invention further comprises a temperature sensor used for fine regulation of the steam temperature, this temperature sensor being also possibly used as an indirect measurement of the water level within the lower part of the tub.
  • water is loaded directly into the tub via a separate independent path including an additional pipe, branched from a main pipe and connected to the tub at a position so as to by-pass a detergent drawer.
  • water is loaded directly into the tub via a separate independent path including an additional pipe, branched from a main pipe and connected to a sump of the tub, thus by-passing a detergent drawer.
  • water is supplied to or sprayed towards the heater of the steam generator via the additional pipe.
  • the present invention offers a number of benefits.
  • One of the advantages of the invention derives from the integration of steam generator (including a heater) in the recirculation circuit connected to the tub.
  • a particular advantage derives from the integration of the heater with the recirculation pump itself, thus requiring minimal changes to the machine design and manufacturing.
  • Another advantage is the reduction in the loss of steam temperature, due to the use of the recirculation pump and the recirculation pipe to convey the steam generated by the heater. This optimizes the steam flow inside the drum.
  • a further advantage is the reduced quantity of water to be heated to produce steam; in a preferred embodiment of the present invention water level is maintained within predetermined threshold so that the heater is only partially covered. Steam is produced quickly and with low energy consumption.
  • a washing machine is shown in front-side perspective view with some parts removed.
  • the machine includes a rotating drum 3, for carrying out a washing, rotatably supported within a tub 2 situated within a cabinet or outer body 1.
  • Water necessary to carry out the washing is derived from a main via a common supply pipe and introduced into the tub 2 via washing water supply pipe 5, by opening of a first solenoid valve. Water is loaded by the washing water supply pipe 5 into one compartment of the detergent drawer 6. The water then flows from the drawer into the tub reaching the sump, where it is heated by a heater.
  • Laundry is introduced into the drum through, for example, an aperture in the front wall of the body 1.
  • the machine is also equipped with a recirculation circuit, including a recirculation pump 18 and a recirculation pipe 8.
  • the machine is provided with a steam generator to carry out a steam cycle, used to heat the laundry inside the drum 3, possibly after the laundry has been wetted with a detergent solution, and/or for refreshing or de-wrinkling the textiles.
  • a steam generator includes a heater 10 to heat water and generate steam, and all the electric components (not shown in the Figures) to control the operation of the heater 10.
  • the exploded view of Figure 2B shows the recirculation circuit
  • Figure 2C shows a particular embodiment of the present invention with the heater 10 integrated in the recirculation pump 18, however, as detailed in the following paragraphs, there are possible alternative embodiments, according to which the heater could be placed out of the pump 18.
  • the steam generator is incorporated into the recirculation circuit (including pipe 8, recirculation pump 18 and heater 10) in order to generate steam, which is then conveyed into the tub 2 by the same recirculation circuit.
  • the steam thus produced passes through the same recirculation circuit as the water used to create the water jets into the drum.
  • This feature has the advantage that a quantity of water smaller than in the prior art washing and/or washer-dryer machines is used to produce the steam, thus obtaining a higher energy efficiency for the production of steam.
  • the steam produced passes through the same recirculation circuit as the recirculation water used to make the water jets onto the laundry, and enters into the drum 3.
  • This steam can be used to heat the laundry inside the drum possibly after that is has been wetted with a detergent solution.
  • the steam produced can be also used to refreshing, sterilizing or de-wrinkling the laundry.
  • the steam circuit realized by using the water recirculation circuit has the advantage that the steam is effectively applied to the textiles inside the drum with minimal heat losses in the system and no waste of energy driving from heating up the washing machine/washer-dryer components, such as the tub 2, the drum 3 and so on.
  • Another advantage due to the foregoing, is a reduction in the loss of steam temperature, as the steam flow inside the drum is optimized.
  • Figure 3 shows a schematic sectional view of the same washing machine incorporating a first embodiment of the invention.
  • the recirculation pump 18 has the function of driving the water into the steam generator 13 (SG).
  • the steam generator 13 is situated along the recirculation pipe 8, downstream of the recirculation pump 18.
  • the steam generator 13 including a heater 10 is situated within a chamber 11, to which the recirculation pipe is connected.
  • the steam generator 13 works as a in-line steam generator, i.e. water is vaporized while flowing through the steam generator itself.
  • the recirculation pump 18 is preferably situated at the same height level of the sump 7.
  • the heater 10 is not necessarily inside the circuit, i.e. it is possible an alternative embodiment according to which the heater does not enter into direct contact with water: in such case the heater can be placed in "thermal" contact with water (e.g. divided by a conductive separator) so that part of the energy is transferred from the heater to the water, in order to increase temperature of the water and generate steam.
  • water e.g. divided by a conductive separator
  • the heater When the heater reaches a predetermined operating temperature, the heater is at least partially in thermal contact with the water in the recirculation circuit.
  • the pump could be activated when a predetermined threshold temperature is reached so that the water enters into thermal contact with the heater and the transfer of energy from the heater to the water takes place.
  • the steam generator 13, including the chamber 11 and the heater 10 is positioned upstream of the recirculation pump 18, in a position between the recirculation pump 18 and the sump 7 of the tub 2.
  • the heater 10 is integrated within the recirculation pump 18. Water passing through the recirculation pump 18 is then heated to generate steam, which is then driven into the tub through the recirculation pipe 8.
  • the heater 10 within the recirculation pump 18 is a film heater instead of a soldered heater, thus enhancing the passage of water through the pump.
  • the heater 10 is not necessarily inside the circuit, i.e. it is possible an alternative embodiment according to which the heater does not enter into direct contact with water: in such case the heater can be placed in "thermal" contact with water (e.g. divided by a conductive separator) so that part of the energy is transferred from the heater to the water, in order to increase temperature of the water and generate steam.
  • a further advantage is the reduced water consumption and the reduced amount of free wash liquid during the main wash. Due to the reduced quantity of water, a consistent energy saving is possible, because less energy is required to heat up the content of the drum.
  • the water should preferably be maintained at the proper level, to ensure safety of the whole system. Therefore, during the steam cycle water is loaded into the tub by opening the solenoid valve 21, the same as during the washing cycle, but in the steam cycle the pressure sensor 16 preferably keeps the water at a lower level, i.e. below the drum limit, so as to avoid wetting the laundry.
  • the pressure sensor keeps the water at a proper level, just enough to partially cover the heater 10 when this latter is integrated into the recirculation pump 18 or when the heater 10 is provided upstream of the recirculation pump 18. This way the steam is produced without activation of the pump, and then driven, by natural convection into the tub, via the recirculation pipe 8, to be ejected onto the laundry.
  • a solenoid valve for instance solenoid valve 21, is operated again to open and refill the circuit up to the proper level.
  • the heater when at predetermined operating temperature, is at least partially in thermal contact with the water in the recirculation circuit.
  • the pump features a thermostat, which cuts off the power supply when the temperature goes above a certain level, which may happen when the water level is too low and the pump heater 10 is not, at least partially, covered.
  • a temperature sensor 12 may be optionally provided, at the chamber 11 or close to the recirculation pump 18 with the heater, respectively, for the fine regulation of the steam generation.
  • This temperature sensor may also be used as an indirect measurement of the water level.
  • the circuit with such configurations can rely on one or more of three different ways to monitor and maintain the water level:
  • a further improvement can be incorporated in the invention, about the water loading system. If the water to be transformed into steam is loaded, as in the traditional way, through the detergent drawer, it may happen that detergent residuals get in contact with the heater, thus generating bad smell and possibly causing malfunction of the system.

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

Claims (12)

  1. Waschmaschine umfassend:
    - eine Wanne (2)
    - eine Trommel (3), die drehbar in der Wanne (2) angebracht ist;
    - einen Umwälzkreis einschließlich einer Umwälzleitung (8) und einer Umwälzpumpe (18), wobei der Umwälzkreis an die Wanne (2) angeschlossen und so ausgelegt ist, dass er das aus der Wanne (2) entnommene Umwälzwasser innerhalb der Wanne (2) umwälzt,
    dadurch gekennzeichnet, dass
    der Umwälzkreis einen Dampferzeuger (13) zum Erzeugen von Dampf umfasst, der durch die Umwälzleitung in die Wanne (2) geleitet wird.
  2. Waschmaschine nach Anspruch 1, wobei der Dampferzeuger (13) eine Kammer (11) und einen Erhitzer (10), der in der Kammer (11) angeordnet ist, aufweist.
  3. Waschmaschine nach Anspruch 2, wobei der Dampferzeuger (13) entlang der Umwälzleitung (8) hinter der Umwälzpumpe (18) angeordnet und die Kammer (11) an die Umwälzleitung (8) angeschlossen ist.
  4. Waschmaschine nach Anspruch 2, wobei der Dampferzeuger (13) entlang der Umwälzleitung (8) vor der Umwälzpumpe (18) zwischen der Umwälzpumpe (18) und einem Sumpf (7) der Wanne (2) angeordnet und die Kammer (11) an die Umwälzleitung (8) angeschlossen ist.
  5. Waschmaschine nach Anspruch 1, wobei der Dampferzeuger (13) einen Erhitzer (10) aufweist und die Umwälzpumpe (18) den Erhitzer (10) umfasst.
  6. Waschmaschine nach Anspruch 5, wobei die Umwälzpumpe (18) nicht höher als der Sumpf (7) der Wanne (2) angeordnet ist.
  7. Waschmaschine nach einem der Ansprüche 1 bis 5, wobei der Erhitzer (10) so angeordnet ist, dass er zumindest teilweise thermischen Kontakt mit dem Wasser des Umwälzkreises hat.
  8. Waschmaschine nach Anspruch 6, wobei der Erhitzer (10) mit einem Thermostaten ausgestattet ist, der die Energiezufuhr unterbricht, wenn die Temperatur aufgrund eines zu niedrigen Wasserstandes, bei dem der Erhitzer (10) nicht mehr oder nur teilweise bedeckt wird, einen bestimmten Pegel erreicht.
  9. Waschmaschine nach einem der vorstehenden Ansprüche, ferner umfassend einen Temperaturfühler zur Regelung der Dampftemperatur.
  10. Waschmaschine nach einem der vorstehenden Ansprüche, wobei Wasser über einen separaten unabhängigen Pfad, einschließlich eines zusätzlichen, von der Hauptwasserleitung (4) abgezweigten und unter Umgehung der Waschmittelschublade (6) an die Wanne (2) angeschlossenen Rohrs (20), direkt in die Wanne (2) eingelassen wird.
  11. Waschmaschine nach einem der Ansprüche 1 bis 9, wobei Wasser über einen separaten unabhängigen Pfad, einschließlich eines zusätzlichen, von der Hauptwasserleitung (4) abgezweigten und an einen Sumpf (7) der Wanne (2) angeschlossenen Rohrs (19), direkt in die Wanne (2) eingelassen wird und so die Waschmittelschublade (6) umgangen wird.
  12. Waschmaschine nach Anspruch 10 oder 11, wobei Wasser dem Erhitzer (10) des Dampferzeugers (13) über ein zusätzliches Rohr (19, 20) zugeführt wird.
EP11193138.2A 2011-12-13 2011-12-13 Waschmaschine mit Rezirkulationspumpe Active EP2604739B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11193138.2A EP2604739B1 (de) 2011-12-13 2011-12-13 Waschmaschine mit Rezirkulationspumpe
PCT/EP2012/075116 WO2013087642A1 (en) 2011-12-13 2012-12-11 Washing machine with recirculation pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11193138.2A EP2604739B1 (de) 2011-12-13 2011-12-13 Waschmaschine mit Rezirkulationspumpe

Publications (2)

Publication Number Publication Date
EP2604739A1 EP2604739A1 (de) 2013-06-19
EP2604739B1 true EP2604739B1 (de) 2015-04-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11193138.2A Active EP2604739B1 (de) 2011-12-13 2011-12-13 Waschmaschine mit Rezirkulationspumpe

Country Status (2)

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EP (1) EP2604739B1 (de)
WO (1) WO2013087642A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2740827B1 (de) * 2012-12-04 2016-04-20 Miele & Cie. KG Waschmaschine mit Dampferzeugungsvorrichtung und Verfahren zu deren Betrieb
KR102206465B1 (ko) * 2013-07-18 2021-01-21 엘지전자 주식회사 세탁기 및 그 제어방법
DE102014217121A1 (de) * 2014-08-28 2016-03-03 BSH Hausgeräte GmbH Wäschepflegegerät mit einer Zuführeinrichtung
EP3209826A1 (de) * 2014-10-24 2017-08-30 Electrolux Appliances Aktiebolag Waschmaschinenvorrichtung mit dampfzufuhr
CN112160118A (zh) * 2020-09-09 2021-01-01 海信（山东）冰箱有限公司 一种洗衣机及其控制方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2840428B2 (ja) 1990-10-22 1998-12-24 三洋電機株式会社 全自動洗濯機
KR100546626B1 (ko) 2005-03-29 2006-01-26 엘지전자 주식회사 세탁기의 증기세탁방법
EP1751344B1 (de) 2005-05-31 2017-11-22 LG Electronics Inc. Waschmaschine mit dampferzeugung und -verwendung
CN1989288B (zh) 2005-05-31 2010-05-26 Lg电子株式会社 控制洗衣机的方法
US7941885B2 (en) * 2006-06-09 2011-05-17 Whirlpool Corporation Steam washing machine operation method having dry spin pre-wash
US7765628B2 (en) * 2006-06-09 2010-08-03 Whirlpool Corporation Steam washing machine operation method having a dual speed spin pre-wash
DE102007028617B4 (de) 2007-06-19 2010-10-28 Miele & Cie. Kg Frontbeschickbare Wäschebehandlungsmaschine mit Dampferzeugungseinrichtung
US8578532B2 (en) * 2009-07-22 2013-11-12 Whirlpool Corporation Laundry treating appliance with controlled mechanical energy
US8578741B2 (en) * 2009-12-17 2013-11-12 Whirlpool Corporation Washing machine with air trap

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WO2013087642A1 (en) 2013-06-20

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