EP2118355B1 - Laundry washing machine with filter in the wash tub - Google Patents

Laundry washing machine with filter in the wash tub Download PDF

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Publication number
EP2118355B1
EP2118355B1 EP08719185A EP08719185A EP2118355B1 EP 2118355 B1 EP2118355 B1 EP 2118355B1 EP 08719185 A EP08719185 A EP 08719185A EP 08719185 A EP08719185 A EP 08719185A EP 2118355 B1 EP2118355 B1 EP 2118355B1
Authority
EP
European Patent Office
Prior art keywords
washing machine
filter
tub
wash
drum
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.)
Not-in-force
Application number
EP08719185A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2118355A2 (en
Inventor
Luisa D'alessandro
Dino Bongini
Paolo Faraldi
Costantino Mariotti
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
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 Indesit Co SpA filed Critical Indesit Co SpA
Priority to PL08719185T priority Critical patent/PL2118355T3/pl
Publication of EP2118355A2 publication Critical patent/EP2118355A2/en
Application granted granted Critical
Publication of EP2118355B1 publication Critical patent/EP2118355B1/en
Not-in-force 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • D06F37/06—Ribs, lifters, or rubbing means forming part of the receptacle
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/12—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a vertical axis
    • D06F37/14—Ribs or rubbing means forming part of the receptacle
    • 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 
    • D06F39/10—Filtering arrangements

Definitions

  • the present invention relates to a washing machine according to the preamble of claim 1, and is particularly applicable to the field of household laundry washing and washing/drying machines, as shown from GB 725123A , UK 20040019857A , JP 07275591A , JP 59077893A , JP 01230394A .
  • textile items are loaded into a wash tub wherein they are suitably treated by means of a wash liquid, which is typically pure water or water containing dissolved detergents, according to the various phases of the operating cycle.
  • a wash liquid typically pure water or water containing dissolved detergents
  • the laundry treatment takes place in several phases, which comprise at least one wash phase and at least one rinse phase; usually each phase includes a wash liquid supply step and a wash liquid drain step.
  • the temperature of the wash liquid in the tub varies according to the type of laundry to be washed and to the type of dirt to be removed: in particular, the more resistant the dirt deposits to be removed from the textiles, the higher the temperature used.
  • Patent application JP2000-185191 has disclosed a household laundry washing machine comprising a device providing anodic oxidation of the dyestuff dispersed in the wash liquid; said device comprises an electrolytic cell capable of separating dyestuff and/or contaminating substances when a direct voltage is applied across its two electrodes.
  • the general idea at the basis of the present invention is to provide a washing machine, in particular a household laundry washing or washing/drying machine, which comprises filtering means adapted to filter the wash liquid contained in the tub.
  • a washing machine in particular a household laundry washing or washing/drying machine, which comprises filtering means adapted to filter the wash liquid contained in the tub.
  • the Applicant has thought of associating filtering means with a component being present inside the machine, which meets the requirement of coming in contact with the wash liquid when the machine is operating.
  • the Applicant has found the so-called “lifter” (i.e. the element applied to the drum and adapted to drag and/or lift the textile items during the treatments) to be the component most suited to being associated with wash liquid filtering means.
  • Fig. 1 shows a washing machine 1, in particular adapted to carry out at least one wash treatment on textile items and to be used within a household environment, which represents a possible embodiment of the present invention.
  • the washing machine designated 1 as a whole in Fig. 1 , will hereafter be referred to as “laundry washing machine”: it is worth specifying that the term “laundry washing machine” includes any machine which is capable of carrying out at least one wash treatment on textile items (and therefore also that machine which is traditionally called “washing/drying machine”), whether the front-loading or top-loading type.
  • the machine called “laundry washing machine” can also carry out a rinse treatment on textile items, wherein the quantity of washing agents remaining after the execution of a previous wash treatment is removed from the textile items.
  • Fig. 1 shows a front-loading laundry washing machine 1.
  • the latter comprises an external structure 10, a tub 2 arranged inside said structure and adapted to contain wash liquid (the "wash liquid” being water or any solution of water and washing agents), a drum 3 rotating inside tub 2 and adapted to contain the textile items to be treated, and at least one element 9 applied to the inner surface of drum 3 and adapted to drag and/or lift the textile items during a wash and/or rinse treatment.
  • element 9 comprises filtering means adapted to filter the wash liquid contained in tub 2 during at least one phase of the wash or rinse treatment. Said filtering means perform the function of at least partly removing the dyestuff and/or contaminating substances dispersed in the wash liquid by absorbing and/or neutralizing and/or separating said substances.
  • lifting and/or lifting element 9 will be referred to as "lifter", this name being commonly used in this technical field.
  • Lifter 9 is a special one since it comprises filtering means; typically, there are also a plurality of traditional lifters 80; 90, which may be made of plastic preferably coated with a layer of a soft and/or elastic material: thus, the textile items will not be subject to possible slight damage due to hitting and/or friction against lifters 80; 90 during the rotation of drum 3.
  • lifter 9; 80; 90 are so sized that the centre of gravity of lifter system 9; 80; 90 lies in the axis of rotation 8 of drum 3, thus not causing any unbalance which might damage laundry washing machine 1 when drum 3 is rotating at high speed (e.g. during the spin phase, wherein drum 3 may reach angular speeds exceeding 1,000 rpm).
  • Lifter 9 is secured to drum 3 in such a way that it is adjacent to the inner surface of drum 3, in particular to the inner surface of the sides of drum 3; like any other lifter 80;90 possibly present in laundry washing machine 1, lifter 9 may be made of plastic material coated with a layer of a soft and/or elastic material. However, it may differ in shape and volume from any other lifter 80;90 being present in washing machine 1.
  • Laundry washing machine 1 comprises a hydraulic circuit adapted to supply and drain water or wash liquid to/from tub 2; the schematic representation of Fig. 1 only shows a few elements of said hydraulic circuits, among which drain duct 15 and pump 13, adapted to generate the drain flow.
  • a trap filter 14 Upstream of pump 13 there is a trap filter 14, the main function of which is to stop any solid particles entering drain duct 15 before they can reach pump 13, which would otherwise be seriously damaged. Laundry washing machine 1 must be maintained periodically by cleaning trap filter 14, i.e. by removing the solid particles accumulated thereon, which represent an obstacle to the wash liquid flow in drain duct 15.
  • Laundry washing machine 1 may be of the type described in patent application EP1057922 , wherein pump 13 is integrated into tub 2; for further detail, reference should be made to this document, the contents of which are assumed to be incorporated in the present description.
  • the hydraulic circuit of laundry washing machine 1 comprises a recirculation duct 20 adapted to bring back into the tub 2 the wash liquid previously taken from said tub 2, thus generating a liquid flow against the textile items contained in drum 3.
  • a diverter valve 22 is located downstream of pump 13, which valve is adapted to direct the wash liquid flow generated by pump 13 into recirculation duct 20 or duct 15.
  • Figs. 2-5 show some views of a lifter 9 manufactured according to the teachings of the present invention and comprising filtering means.
  • Fig. 2 is a side view of lifter
  • Fig. 3 is a view of lifter 9 (i.e. it shows lifter 9 as viewed by an observer looking in the direction of the axis of rotation 8 of drum 3 from the inner surface of drum 3, lifter 9 being interposed between the observer and axis 8)
  • Figs. 4-5 are two sectional views of lifter 9 along respective planes called section plane A and section plane B, which are orthogonal to axis of rotation 8 of drum 3.
  • the filtering means comprise a filter 23 having a matrix or substrate adapted to exert a chemical and/or physical filtering action on said dyestuff and/or contaminating substances by means of active sites provided on the filter itself.
  • filter 23 is housed in a first chamber 12 obtained within lifter 9; in addition, filter 23 can be removed from lifter 9: thus, the user of laundry washing machine 1 is given the possibility of removing filter 23 when it has become exhausted, in order to replace it with a new one.
  • means for accessing first chamber 12 consist of a chamber lid 31 fitted with suitable means (e.g. a pair of hinges) allowing it to rotate about an axis 7, which is parallel to axis of rotation 8 of drum.
  • lid 31 In order to replace filter 23, the user first opens lid 31 (this step may be facilitated by grip means 32, such as, for example, a particular shape of the free end of lid 31), and then extracts exhausted filter 23 and replaces it with a new one; finally, he/she closes lid 31 again.
  • grip means 32 such as, for example, a particular shape of the free end of lid 31
  • filter 23 may be replaced by removing whole lifter 9, which is detachable from drum 3, or else (according to a solution verified by the Applicant to be particularly efficient in view of an ergonomic use of laundry washing machine 1) the filter may be replaced by translating filter 23 in the axial direction (i.e. the direction in which lifter 9 extends), thus sliding said filter 23 through an aperture (which can preferably be re-closed) obtained in front wall 40 of lifter 9.
  • the extraction of exhausted filter 23 and the subsequent insertion of a new filter into first chamber 12 may be made easier by providing laundry washing machine 1 with a system for hooking lifter 9, which allows the user to raise at least the front portion of lifter 9 relative to the surface of drum 3 and/or to move it forwards.
  • filter 23 consists of a material substrate which makes it capable of exerting a physical filtering action on dyestuff and/or contaminating substances dispersed in the wash liquid contained in tub 2, and/or a chemical filtering action through active sites provided on the surface of filter 23 (which typically adsorb said dyestuff and/or contaminating substances); for this purpose, its geometry is such that the area/volume ratio is maximized.
  • a cellulose fabric having a cationized surface is a preferred example of a suitable substrate which may be used for manufacturing filter 23: other materials may however be used as well (e.g. even activated carbon, although laboratory tests carried out by the Applicant have shown that cationized cellulose should be preferred over activated carbon because it is more effective in absorbing and/or neutralizing and/or separating dyestuff and/or contaminating substances).
  • the substrate used for manufacturing filter 23 may be either a rigid material (as shown in the drawings annexed to the present description) or a flexible material; in the latter case, filter 23 is held in its housing inside lifter 9 by means of an inert support (e.g. a rigid plastic frame).
  • an inert support e.g. a rigid plastic frame
  • the filtering means may comprise, as an alternative to or in association with filter 23, a different filtering element such as, for example, an ultraviolet ray source (lamp or LED), which may be housed within lifter 9.
  • a different filtering element such as, for example, an ultraviolet ray source (lamp or LED), which may be housed within lifter 9.
  • Such a source is suitable for purifying the wash liquid neutralizing by dissociation a part of the contaminating substances dispersed in said liquid.
  • a filter including a material which can be activated by ultraviolet light e.g. titanium dioxide: said filter releases particles in the wash liquid which, when illuminated by an ultraviolet radiation, become capable of effectively removing any dyestuff and/or contaminating substances dispersed in the wash liquid.
  • lifter 9 For filter 23 housed in lifter 9 to be able to carry out its filtering action, it is necessary that, when laundry washing machine 1 is in operation, it comes directly in contact with the wash liquid contained in tub 2.
  • lifter 9 is provided with a series of apertures which allow liquid substances to flow inside of it and lap or cross the surface of filter 23.
  • Lifter 9 also comprises means for spraying the textile items contained in drum 3 during a wash or rinse treatment.
  • lifter 9 shown in Figs. 2-5 can also be used as a sprayer, since it can collect wash liquid inside (which wash liquid is loaded when lifter 9 goes through the wash bath as drum 3 rotates) and can subsequently release the collected wash liquid (which preferably has also been filtered) through one or more jets flushing from above the textile items contained in drum 3.
  • lifter 9 comprises a plurality of outlet channels 83 through which (during the operating phases of laundry washing machine 1 wherein drum 3 is rotating about its axis 8) the wash liquid, after having entered first chamber 12 and having been filtered by filter 23, is then released back into tub 2, thus improving the soaking of the textile items contained in drum 2 and making the wash liquid filtering action more homogeneous.
  • Outlet channels 83 may have any shape (e.g. they may have a circular section) and may be distributed freely on the surface of lifter 9 (e.g. they may be arranged in several rows, preferably offset to one another).
  • Lifter 9 is particularly suitable for use as a sprayer when laundry washing machine 1 comprises, as in the case shown in Fig. 1 , a recirculation duct 20.
  • lifter 9 comprises a through hole 88 obtained in its back surface, through which wash liquid can be introduced into first chamber 12 from recirculation duct 20; a recirculation step which may be carried out by laundry washing machine 1 according to the present invention is shown in Fig. 6 .
  • Recirculation flow P is conveyed through through hole 88 from recirculation duct 20 to lifter 9, where it is filtered by filter 23 and is then divided into a plurality of spouts S exiting lifter 9 through outlet channels 83 and hitting textile items 11 contained in the drum.
  • the above-described recirculation step is adapted to maximize the quantity of wash liquid that is filtered when laundry washing machine 1 is in operation, thereby also maximizing the quantity of dyestuff and/or contaminating substances absorbed and/or neutralized and/or separated by the filtering means comprised in lifter 9.
  • Laundry washing machine 1 shown in Fig. 6 is therefore particularly effective in countering the so-called "bleeding" of textile items 11 during wash and/or rinse treatments; the effectiveness of laundry washing machine 1 can be improved even further by arranging auxiliary filtering means along recirculation duct 20: these auxiliary filtering means may comprise a filter which is similar to filter 23 and/or a filtering device of a different type.
  • Lifter 9 also comprises means for inspecting and/or maintaining at least one component of laundry washing machine 1; according to the embodiment of lifter 9 shown in Figs. 2-5 , in fact, said lifter may also be used in a laundry washing machine 1 as an inspection device. It is worth specifying that the presence of said inspection and/or maintenance means in lifter 9 according to the present invention is absolutely optional.
  • lifter 9 comprises a movable element which, if opened when laundry washing machine 1 is off and lifter 9 is in the position shown in Fig. 1 , allows the user to inspect the condition of trap filter 14 located upstream of pump 13 and to remove any solid deposits accumulated on trap filter 14.
  • the movable element consists of a second lid 70 fitted with suitable means (e.g. a pair of hinges) which allow it to rotate about axis 77, said axis 77 being in particular parallel to or coinciding with axis of rotation 7 of first lid 31; second lid 70 can be opened easily thanks to second grip means 72 associated therewith.
  • suitable means e.g. a pair of hinges
  • the user After having raised second lid 70, the user has maintenance access to trap filter 14 through an aperture 71 obtained in the bottom of lifter 9, which is above trap filter 14 when lifter 9 is in the position of Fig. 1 .
  • the dimensions of aperture 71 are preferably such that a hand can pass through it.
  • Lifter 9 shown in Figs. 2-5 comprises a second chamber 78, separated from first chamber 12 by a dividing wall 79; however, it is also possible to provide a lifter 9 comprising a single inner chamber which houses filter 23 and through which one can reach aperture 71 in order to maintain trap filter 14.
  • drum 2 is mounted in laundry washing machine 1 in such a manner that its axis of rotation 8 is inclined relative to the horizontal plane, said inclination being approximately 10°
  • lifter 9 will advantageously have at least one port adapted to allow the wash liquid to flow out of drum 2.
  • Said port is located in that portion of lifter 9 which is lowest when lifter 9 is in the position of Fig. 1 : in the non-limiting example shown in Figs. 2-5 , it has been assumed that said portion is the lower part of second chamber 78, and that said port is provided by means of a slit 76 obtained under second grip means 72 of second lid 70.
  • the washing machine according to the present invention offers a low-cost, easy-to-maintain system for filtering dyestuff and/or contaminating substances dispersed in the wash liquid and for countering the textile bleeding phenomenon.
  • washing machine comprising a "multifunction" lifter, i.e. a lifter capable of combining traditional functions with a number of additional functions, such as:

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Treatment Of Fiber Materials (AREA)
EP08719185A 2007-03-02 2008-02-29 Laundry washing machine with filter in the wash tub Not-in-force EP2118355B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08719185T PL2118355T3 (pl) 2007-03-02 2008-02-29 Urządzenie pralnicze z filtrem w kotle do prania

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000157A ITTO20070157A1 (it) 2007-03-02 2007-03-02 Macchina lavabiancheria con filtro nella vasca di lavaggio
PCT/IB2008/000446 WO2008107762A2 (en) 2007-03-02 2008-02-29 Laundry washing machine with filter in the wash tub

Publications (2)

Publication Number Publication Date
EP2118355A2 EP2118355A2 (en) 2009-11-18
EP2118355B1 true EP2118355B1 (en) 2012-11-21

Family

ID=39717828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08719185A Not-in-force EP2118355B1 (en) 2007-03-02 2008-02-29 Laundry washing machine with filter in the wash tub

Country Status (5)

Country Link
EP (1) EP2118355B1 (pl)
ES (1) ES2399369T3 (pl)
IT (1) ITTO20070157A1 (pl)
PL (1) PL2118355T3 (pl)
WO (1) WO2008107762A2 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12139843B2 (en) 2021-01-12 2024-11-12 Whirlpool Corporation Foreign substrate collector for a laundry appliance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202543635U (zh) * 2012-04-24 2012-11-21 海尔集团技术研发中心 一种洗衣机提升筋及洗衣机
EP2676954A1 (en) 2012-06-19 2013-12-25 Laboratorios del Dr. Esteve S.A. Heterocyclyl-substituted-phenyl derivatives as vasodilators
DE102018216396A1 (de) * 2018-09-26 2020-03-26 BSH Hausgeräte GmbH Wäschepflegegerät mit einem Filterelement
TR202006084A2 (tr) * 2020-04-17 2021-10-21 Arçeli̇k Anoni̇m Şi̇rketi̇ Kanat i̇çeren bi̇r yikayici veya yikayici-kurutucu

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB725123A (en) * 1952-11-10 1955-03-02 Lovell Mfg Co Laundry machine
JPS5937120B2 (ja) * 1983-09-19 1984-09-07 松下電器産業株式会社 ドラム式洗濯機
JPH01230394A (ja) * 1988-03-09 1989-09-13 Hitachi Ltd 電気洗濯機の糸屑収集装置
JPH07275591A (ja) * 1994-04-07 1995-10-24 Hitachi Ltd 衣類乾燥機
JP3817502B2 (ja) * 2002-08-30 2006-09-06 株式会社東芝 ドラム式洗濯機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12139843B2 (en) 2021-01-12 2024-11-12 Whirlpool Corporation Foreign substrate collector for a laundry appliance

Also Published As

Publication number Publication date
EP2118355A2 (en) 2009-11-18
WO2008107762A3 (en) 2008-11-06
ITTO20070157A1 (it) 2008-09-03
WO2008107762A2 (en) 2008-09-12
ES2399369T3 (es) 2013-03-27
PL2118355T3 (pl) 2013-04-30

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