EP1830688B1 - Water-conducting household appliance and method for the operation thereof - Google Patents

Water-conducting household appliance and method for the operation thereof Download PDF

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Publication number
EP1830688B1
EP1830688B1 EP05797125.1A EP05797125A EP1830688B1 EP 1830688 B1 EP1830688 B1 EP 1830688B1 EP 05797125 A EP05797125 A EP 05797125A EP 1830688 B1 EP1830688 B1 EP 1830688B1
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EP
European Patent Office
Prior art keywords
filter element
rinsing liquid
dishwasher
water circuit
operating state
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
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EP05797125.1A
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German (de)
French (fr)
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EP1830688A1 (en
Inventor
Egbert Classen
Helmut Jerg
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1830688A1 publication Critical patent/EP1830688A1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4206—Tubular filters

Definitions

  • the invention relates to a dishwasher, with at least one substantially closed water circulation, in which rinsing liquid is circulated in accordance with a program control unit, wherein the rinsing liquid is conveyed during the circulation for filtering impurities through a filter element.
  • dishwashing machines When operating a dishwasher, depending on the degree of soiling of the items to be cleaned, larger and smaller impurities are removed from the items to be washed by the rinsing liquid.
  • so-called dishwashing machines arrange more or less complex filter arrangements in the region of the rinsing pan or the sump.
  • a filter arrangement mounted in the sump of the dishwasher frequently consists of a coarse sieve which filters out large-diameter contaminants from the rinsing liquid, a fine sieve whose mesh diameter is in the range from 0.9 to 1.1 mm, and a micro sieve connected downstream of the fine sieve Mesh size is about 0.3 mm to filter even small impurities from the rinsing liquid.
  • the purpose of such a filter arrangement is, during the circulation of the rinsing liquid, to filter out the largest possible proportion of impurities from the rinsing liquid.
  • a disadvantage of the arrangement just described is that in practice only a portion of the impurities held in the filter assembly can be removed from the dishwasher during pumping. Therefore, it is necessary that at least some of the filter elements of the filter assembly are temporarily removed manually by a user of the dishwasher and cleaned manually. Around To spare the user of a dishwasher such unpleasant activity, it would be desirable if the filter assembly of the self-cleaning type would be.
  • a dishwasher with such a self-cleaning filter is for example from the US 3,179,116 known.
  • the filter consists of a helical spring, wherein the distances of superimposed spiral sections are variably adjustable.
  • the spring When the rinsing liquid is circulated from the rinsing trough to the rinsing arms, the spring has a small length and thus small spiral section distances, so that contaminants detached from the ware are filtered by the spiral spring.
  • the length of the coil spring is increased, whereby the distance between two adjacent spring sections increases, so that the adhering to the coil spring impurities flushed by the pumped flushing liquid into the interior of the coil spring and finally fed to the water drain.
  • the changing of the length of the coil spring is made by water pressure generated in the lines, which is dependent on the direction of a circulation pump. During the circulation, only a slight water pressure is generated in a line connected to the spiral spring, whereby the coil spring remains shortened in length. When pumping, however, a high pressure is generated in the line connected to the spiral spring, whereby the coil spring is extended by a lever mechanism.
  • a disadvantage of the described arrangement is that the self-cleaning of the filter can only take place when changing from one to the next wash program section. However, if the filter is acted upon during a Spülprogrammabitess with a large amount of impurities, it can not be circulated by the pump enough rinse liquid for applying the dishes. The proposed arrangement therefore accepts that the cleaning effect of individual rinse program sections may be lowered.
  • a device for wet washing garments which has a designed as a gap filter lint filter and a fine filter.
  • the lint filter consists of wires running parallel to one another and is arranged such that a liquid inlet opening above the upper end of the wire layer and one of two liquid outlet openings optionally immediately behind located at the bottom of the wire layer.
  • the other outlet opening of the split filter leads to the inlet side of the feed pump and is located at any point of the bottom portion of the lint filter housing.
  • the slit filter makes it possible to slip in the continuous passage of the washing water in several program sections supplied lint along the parallel wires to the lower end of the wire layer in front of the closable liquid outlet opening. From there, the impurities (lint) at the end of the program sections are washed by opening the liquid outlet through the effluent wash water with into the sewer.
  • the fine filter only serves to retain washed out of the garments detergent in this.
  • a method for filtering the rinsing liquid in a dishwasher is known.
  • the flow of rinsing liquid from the container is sucked by a main circulating pump and introduced via a plurality of spray nozzles back into the container.
  • the stream is passed through a circuit comprising a primary screen and a perforated basket which serve to retain large debris and a chamber.
  • the chamber is located below the primary screen and surrounds the basket at least partially. For retaining fine dirt particles, the chamber has a filter element.
  • the method also includes a step of aspirating a portion of the flow of irrigation fluid at a point in the circuit downstream of the filter element and / or the primary screen by means of a suitable booster pump and directing the aspirated portion to an additional filter element. to retain fine dirt particles. After filtering, this part is returned to the flow of rinse liquid.
  • the object of the present invention is to provide a dishwasher which makes manual cleaning of a filter element used for retaining impurities superfluous, wherein the qualitative properties of the dishwasher should be optimized in terms of energy consumption and cleaning performance.
  • a dishwasher according to the invention with at least one substantially closed water cycle in the rinsing liquid in accordance with a program control unit is circulated, the rinsing liquid during circulation for filtering impurities by at least one filter element is conveyed.
  • the at least one filter element consists of thread elements which are arranged in a tensioned state for cleaning the rinsing liquid and in a relaxed state for cleaning the filter element.
  • the thread elements are arranged on holding elements and in the tensioned state substantially in a plane or in a curved shape, for. B. cylindrical shape arranged.
  • a further water circuit is provided in the dishwasher, through which the rinsing liquid is circulated in accordance with the program control unit, when the filter element is covered with impurities, to effect the removal of dirt from the filter element.
  • the provision of another water cycle advantageously makes it possible to carry out the self-cleaning of the filter element during a wash program section, without the need for pumping out the dishwashing liquid currently being used in the dishwasher.
  • the provision of the further water cycle further reliably prevents contaminants detached from the filter element from migrating into the closed water loop, thereby avoiding the settling of these dissolved contaminants on the items to be washed.
  • the filter element is installed on or in a sump of the dishwasher such that it is well bathed by the rinsing liquid flowing or conveyed in the further water cycle. This ensures that all or at least a large part of the impurities that have settled on the filter element can be solved by the rinsing fluid circulated in the further water cycle.
  • the filter element has a variable mesh or gap width for providing a first and a second operating state, wherein the filter element in the first operating state, the filtering of impurities from the impurities in the water circulation carries out and in the second operating state, the release of the in the filter element trapped impurities when flowing through the funded by the further water circulation rinsing allows.
  • the cleaning of impurities is facilitated, as are easily removable by an altered mesh or gap width, in particular an increase, residues when flowing through the filter element with rinsing liquid.
  • a spatially uniform layer of the filtration material is formed, which has a large absorption capacity and enables a high degree of cleaning of the rinsing liquid during circulation in the closed water cycle.
  • a further filter element in the further water cycle. Characterized the detached from the filter element impurities are held in the further filter element of the further water cycle, whereby the flushing liquid flowing through the filter element with increasing continuation of the circulation in the further water cycle freed from more and more residues is.
  • the flushing performance is not affected by an increasingly clogging filter element, since by actuation of the further water cycle, a filter element with constant filter performance is created.
  • the further filter element is arranged in a collecting container. This makes it possible to collect the promoted in the wider water cycle impurities.
  • the further filter element has a variable mesh or gap width for providing a first and a second operating state, wherein the further filter element in the first operating state, the filtering of impurities promoted in the further water circulation rinse liquid and in the second operating state, the release of the Impurities trapped in the further filter element when flowing around the further filter element with rinsing liquid of the further water cycle.
  • the further filter element is designed to be self-cleaning. This ensures a constant filtering performance of the second filter element during operation of the further water cycle.
  • the further water circuit is integrated into a water drain, so that the conveyed in the further water circulation rinse liquid can be supplied according to the program control unit either the dishwasher or the wastewater drain.
  • the further water circuit is advantageously operated such that the further filter element is in the first operating state when the rinsing liquid is circulated in the dishwasher. Accordingly, the further filter element is in the second operating state in which this allows a cleaning, wherein the impurities are supplied to the water drain. After a "temporary storage" of the impurities in the further filter element or the collecting container, the impurities are transported out of the dishwasher.
  • a method for operating a dishwasher with a program program comprising several program sections comprises the following steps:
  • the filter element is operated during the course of the wash program in a first operating state, in which this takes over a filtering of the washing liquid of impurities of the closed water cycle.
  • the program control unit or upon detection of a defined occupancy of the filter element with impurities of the further water cycle is activated and brought the filter element in a second operating state for detachment of impurities present in or on it.
  • the second filter element is operated in activated further water circuit in its first operating state to free the conveyed in the further water circulation rinsing fluid from impurities.
  • the further filter element is spent after completion of the wash program or in accordance with the program control unit in a second operating state in which the impurities located on or in the further filter element are flushed out of the further filter element by the rinsing liquid conveyed in the further water cycle ,
  • the rinsing liquid conveyed in the further water cycle is supplied to the water outlet during the second operating state of the further filter element.
  • the dishwashing machine according to the invention thus advantageously makes it possible to carry out a self-cleaning of the filter element of the closed water circuit during a wash program section instead of basically waiting for the wash program end, as proposed in the prior art.
  • the cleaning performance during a Spülprogrammabitess be kept at a consistently high level without the dishwasher additional fresh water would have to be supplied.
  • a dishwasher 1 is shown in a schematic view.
  • the dishwasher 1 essentially comprises a washing compartment 2, in which not shown Dishware is arranged, a Speller thoroughlykeitsniklauf 6, a (not shown in the figure) water inlet and a water outlet 11.
  • the items to be washed is arranged in the washing compartment 2 between washing or spraying 3.
  • the sump 5 belongs to the rinsing liquid circuit 6, in which the rinsing liquid 7 required for a washing process is circulated.
  • the sump 5 is removed via a line 8 rinsing liquid and passed through a filter element 14 to a pump 9.
  • the rinsing liquid is passed through lines 10 to the washing arms 3 after passing through a water heater (not shown) and sprayed by them into the washing compartment 2.
  • the rinsing liquid 7 then passes through the rinsing tank 4 back into the sump 5.
  • the water outlet 11 is connected, via which the rinsing liquid can be derived.
  • the dishwasher 1 may have further, not shown in the figure elements, such as a device for the addition of detergent, a water softening system, sensors and the like.
  • this is designed as a self-cleaning filter element.
  • a self-cleaning filter element is exemplary in the Figures 2 and 3 shown, in Fig. 2 a first operating state is shown, in which a filtering of the conveyed through it rinsing liquid is effected.
  • FIG. 3 shows the filter element in a second operating state in which a self-cleaning is possible.
  • the filter elements shown in the figures are traversed perpendicular to the sheet plane.
  • the filter element has for this purpose in a trained with guides 31 housing 30 holding elements 32, between which thread elements 33, for example made of metal, a plastic or other material, are arranged.
  • thread elements 33 for example made of metal, a plastic or other material
  • tensioning the thread elements 33 is formed in Fig. 2a shown parallel alignment with a defined distance from each other. Depending on the desired filter effect, the distance can be defined by fastening the thread elements 33 in the holding elements 32.
  • the tensioning and relaxing of the thread elements 33 with the holding elements 32 via corresponding devices, for. As spindles or hydraulic devices.
  • Fig. 2b It can be seen that all thread elements 33 lie in one plane, whereby a good filtering effect is ensured.
  • the thread elements 33 can relax in the manner shown in the figure, whereby the distances are increased in more or less random manner.
  • the impurities held on or in it can then be rinsed out.
  • the self-cleaning process of the filter 14 can either be controlled by a program control unit (not shown in the figures) or upon detection of a defined occupancy of the filter element 14. With increasing occupancy of the filter element 14, the funded by the pump 9 flushing liquid is reduced. By the measured after the filter element 14 funded amount of flushing liquid can then be closed to the assignment of the filter element.
  • the filter element 14 spent in its second operating state.
  • a further pump 13 is set in motion, which promotes the flushing liquid 7 located in the sump 5 by a further water circuit 15.
  • the pump 13 is located in the further water circuit 15, which also has a collecting container 16, in which a further filter element 17 is arranged.
  • On the output side is the Sump 16 via a valve 18 selectively connected to the water outlet 11 or a line 20 which promotes circulating in the further water circulation 15 rinsing liquid back into the sump 5.
  • the filter element 14 In order to be able to effect a self-cleaning of the filter element 14, it must be flowed around in a suitable manner by the rinsing liquid conveyed through the further water circuit 15. In practice, the filter element 14 will therefore be arranged at a suitable location in the conduit 8 or directly on or in the sump 5.
  • the detached from the filter element 14 impurities are collected via the pump 13 and the line 19 through the further filter element 17, which is preferably also carried out self-cleaning.
  • the funded by the further water circulation 15 rinsing liquid is thus cleaned at the outlet of the collecting container 16, and, if the water cycle was actuated during a Spülprogrammabitess, fed to the sump 5.
  • the further water circuit 15 can be deactivated, at the same time the filter element 14 is returned to its first operating position. Subsequently, the interrupted rinse program section can be continued.
  • the self-cleaning of the filter element 14 at the end of a washing program section. In this case, for example, the rinsing liquid cleaned by the further filter element 17 could be taken for the next rinsing program section, so that the supply of fresh water could be dispensed with.

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  • Washing And Drying Of Tableware (AREA)
  • Domestic Plumbing Installations (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Description

Die Erfindung betrifft eine Geschirrspülmaschine, mit wenigstens einem im Wesentlichen geschlossenen Wasserkreislauf, in dem Spülflüssigkeit nach Maßgabe einer Programmsteuereinheit umwälzbar ist, wobei die Spülflüssigkeit beim Umwälzen zur Filterung von Verunreinigungen durch ein Filterelement förderbar ist.The invention relates to a dishwasher, with at least one substantially closed water circulation, in which rinsing liquid is circulated in accordance with a program control unit, wherein the rinsing liquid is conveyed during the circulation for filtering impurities through a filter element.

Beim Betreiben einer Geschirrspülmaschine werden je nach Verschmutzungsgrad des zu reinigenden Spülguts größere und kleinere Verunreinigungen durch die Spülflüssigkeit vom Spülgut abgelöst. Um zu verhindern, dass durch während eines Spülprogrammabschnitts umgewälzte Spülflüssigkeit die bereits von dem Spülgut abgelösten Verunreinigungen wieder auf das Spülgut aufgebracht werden, sind bei bekannten Geschirrspülmaschinen mehr oder weniger komplexe Filteranordnungen im Bereich der Spülwanne bzw. des Pumpentopfs angeordnet. Eine im Pumpentopf der Geschirrspülmaschine angebrachte Filteranordnung besteht dabei häufig aus einem Grobsieb, welches Verunreinigungen mit großem Durchmesser aus der Spülflüssigkeit ausfiltert, einem Feinsieb, dessen Maschendurchmesser im Bereich von 0,9 bis 1,1 mm liegt, sowie einem dem Feinsieb nachgeschalteten Mikrosieb, dessen Maschenweite ca. 0,3 mm beträgt, um auch kleine Verunreinigungen aus der Spülflüssigkeit zu filtern. Zweck einer derartigen Filteranordnung ist es, während des Umwälzens der Spülflüssigkeit, einen möglichst großen Anteil an Verunreinigungen aus der Spülflüssigkeit auszufiltern. Beim Abpumpen der Spülflüssigkeit, z.B. beim Wechsel von einem Spülprogrammabschnitt zum nächsten Spülprogrammabschnitt soll ein möglichst großer Teil der Verunreinigungen aus dem Spülraum der Geschirrspülmaschine gefördert werden, um ein Verstopfen der Filteranordnung zu vermeiden.When operating a dishwasher, depending on the degree of soiling of the items to be cleaned, larger and smaller impurities are removed from the items to be washed by the rinsing liquid. In order to prevent rinsing fluid already being circulated during a rinsing program section from being applied again to the items to be washed, so-called dishwashing machines arrange more or less complex filter arrangements in the region of the rinsing pan or the sump. A filter arrangement mounted in the sump of the dishwasher frequently consists of a coarse sieve which filters out large-diameter contaminants from the rinsing liquid, a fine sieve whose mesh diameter is in the range from 0.9 to 1.1 mm, and a micro sieve connected downstream of the fine sieve Mesh size is about 0.3 mm to filter even small impurities from the rinsing liquid. The purpose of such a filter arrangement is, during the circulation of the rinsing liquid, to filter out the largest possible proportion of impurities from the rinsing liquid. When pumping out the rinsing liquid, e.g. When changing from one rinsing program section to the next rinsing program section, the largest possible part of the impurities should be conveyed out of the washing compartment of the dishwasher in order to avoid clogging of the filter arrangement.

Ein Nachteil der eben beschriebenen Anordnung besteht darin, dass in der Praxis lediglich ein Teil der in der Filteranordnung gehaltenen Verunreinigungen beim Abpumpen aus der Geschirrspülmaschine entfernt werden können. Deshalb ist es notwendig, dass zumindest manche der Filterelemente der Filteranordnung zeitweise manuell durch einen Nutzer der Geschirrspülmaschine aus dieser entfernt und manuell gereinigt werden. Um dem Nutzer einer Geschirrspülmaschine eine derart unangenehme Tätigkeit zu ersparen, wäre es wünschenswert, wenn die Filteranordnung vom selbstreinigenden Typ wäre.A disadvantage of the arrangement just described is that in practice only a portion of the impurities held in the filter assembly can be removed from the dishwasher during pumping. Therefore, it is necessary that at least some of the filter elements of the filter assembly are temporarily removed manually by a user of the dishwasher and cleaned manually. Around To spare the user of a dishwasher such unpleasant activity, it would be desirable if the filter assembly of the self-cleaning type would be.

Eine Geschirrspülmaschine mit einem derartigen selbstreinigenden Filter ist beispielsweise aus der US 3,179,116 bekannt. Der Filter besteht dabei aus einer Schraubenfeder, wobei die Abstände übereinander liegender Spiralabschnitte variabel einstellbar sind. Beim Umwälzen der Spülflüssigkeit von der Spülwanne zu den Spülarmen weist die Feder eine kleine Länge und damit geringe Spiralabschnittabstände auf, so dass von dem Spülgut abgelöste Verunreinigungen durch die Spiralfeder gefiltert werden. Beim Abpumpen der Spülflüssigkeit, welches durch eine veränderte Drehrichtung der Pumpe bewirkt wird, wird die Länge der Spiralfeder vergrößert, wodurch sich der Abstand zwischen zwei benachbarten Federabschnitten vergrößert, so dass die an der Spiralfeder haftenden Verunreinigungen durch die abgepumpte Spülflüssigkeit in das Innere der Spiralfeder gespült und schließlich dem Wasserablauf zugeführt werden. Das Verändern der Länge der Spiralfeder wird durch in den Leitungen erzeugten Wasserdruck vorgenommen, der abhängig von der Laufrichtung einer Umwälzpumpe ist. Während des Umwälzens wird in einer mit der Spiralfeder verbundenen Leitung ein nur geringer Wasserdruck erzeugt, wodurch die Spiralfeder in ihrer Länge verkürzt bleibt. Beim Abpumpen wird hingegen in der mit der Spiralfeder verbundenen Leitung ein hoher Druck erzeugt, wodurch über einen Hebelmechanismus die Spiralfeder verlängert wird.A dishwasher with such a self-cleaning filter is for example from the US 3,179,116 known. The filter consists of a helical spring, wherein the distances of superimposed spiral sections are variably adjustable. When the rinsing liquid is circulated from the rinsing trough to the rinsing arms, the spring has a small length and thus small spiral section distances, so that contaminants detached from the ware are filtered by the spiral spring. When pumping the flushing liquid, which is caused by a change in the direction of rotation of the pump, the length of the coil spring is increased, whereby the distance between two adjacent spring sections increases, so that the adhering to the coil spring impurities flushed by the pumped flushing liquid into the interior of the coil spring and finally fed to the water drain. The changing of the length of the coil spring is made by water pressure generated in the lines, which is dependent on the direction of a circulation pump. During the circulation, only a slight water pressure is generated in a line connected to the spiral spring, whereby the coil spring remains shortened in length. When pumping, however, a high pressure is generated in the line connected to the spiral spring, whereby the coil spring is extended by a lever mechanism.

Ein Nachteil der beschriebenen Anordnung besteht darin, dass die Selbstreinigung des Filters lediglich beim Wechsel von einem zum nächsten Spülprogrammabschnitt erfolgen kann. Wird der Filter jedoch während eines Spülprogrammabschnitts mit einer großen Menge an Verunreinigungen beaufschlagt, so kann durch die Pumpe nicht mehr genug Spülflüssigkeit zum Beaufschlagen des Spülguts umgewälzt werden. Die vorgeschlagene Anordnung nimmt deshalb in Kauf, dass die Reinigungswirkung einzelner Spülprogrammabschnitte erniedrigt werden darf.A disadvantage of the described arrangement is that the self-cleaning of the filter can only take place when changing from one to the next wash program section. However, if the filter is acted upon during a Spülprogrammabschnitts with a large amount of impurities, it can not be circulated by the pump enough rinse liquid for applying the dishes. The proposed arrangement therefore accepts that the cleaning effect of individual rinse program sections may be lowered.

Aus der DE 36 33 441 A1 ist eine Einrichtung zum Nasswaschen von Kleidungsstücken bekannt, welche einen als Spaltfilter ausgebildeten Flusenfilter sowie einen Feinfilter aufweist. Der Flusenfilter besteht aus parallel zueinander verlaufenden Drähten und ist derart angeordnet, dass sich eine Flüssigkeitseinlassöffnung oberhalb des oberen Endes der Drahtlage und eine von zwei Flüssigkeitsauslassöffnungen wahlweise unmittelbar hinter dem unteren Ende der Drahtlage befinden. Die andere Auslassöffnung des Spaltfilters führt zur Einlassseite der Förderpumpe und befindet sich an einer beliebigen Stelle des Bodenbereichs des Flusenfiltergehäuses. Der Spaltfilter ermöglicht es beim fortlaufenden Hindurchführen des Waschwassers in mehreren Programmabschnitten zugeführten Flusen entlang der parallelen Drähte bis zum unteren Ende der Drahtlage vor die verschließbare Flüssigkeitsauslauföffnung abrutschen zu können. Von dort werden die Verunreinigungen (Flusen) beim Ende der Programmabschnitte durch Öffnen der Flüssigkeitsauslassöffnung durch das ausströmende Waschwasser mit in die Kanalisation geschwemmt. Der Feinfilter dient lediglich dazu, aus den Kleidungsstücken ausgespültes Waschmittel in diesem zurückzuhalten.From the DE 36 33 441 A1 a device for wet washing garments is known, which has a designed as a gap filter lint filter and a fine filter. The lint filter consists of wires running parallel to one another and is arranged such that a liquid inlet opening above the upper end of the wire layer and one of two liquid outlet openings optionally immediately behind located at the bottom of the wire layer. The other outlet opening of the split filter leads to the inlet side of the feed pump and is located at any point of the bottom portion of the lint filter housing. The slit filter makes it possible to slip in the continuous passage of the washing water in several program sections supplied lint along the parallel wires to the lower end of the wire layer in front of the closable liquid outlet opening. From there, the impurities (lint) at the end of the program sections are washed by opening the liquid outlet through the effluent wash water with into the sewer. The fine filter only serves to retain washed out of the garments detergent in this.

Da die Verunreinigungen beim Betrieb einer Geschirrspülmaschine hinsichtlich ihrer Größe und ihrer Beschaffenheit sehr viel stärker variieren als dies beim Reinigen von Kleidungsstücken der Fall ist, ist der in der DE 36 33 441 A1 beschriebene Filter in einer Geschirrspülmaschine nicht einsetzbar. Darüber hinaus besteht wie bei der US 3,179,116 der Nachteil, dass ein Reinigen des Filters lediglich beim Übergang von einem Waschprogramm zum nächsten Waschprogramm möglich ist.Since the impurities in the operation of a dishwasher vary much more in terms of their size and texture than is the case with the cleaning of garments, which is in the DE 36 33 441 A1 filter can not be used in a dishwasher described. In addition, as with the US 3,179,116 the disadvantage that a cleaning of the filter is only possible during the transition from a wash program to the next wash program.

Aus der EP 0 990 413 A1 ist ein Verfahren zum Filtern der Spülflüssigkeit in einem Geschirrspüler bekannt. Dabei wird der Strom von Spülflüssigkeit aus dem Behälter durch eine Haupt-Umwälzpumpe gesaugt und über eine Vielzahl von Sprühdüsen wieder in den Behälter eingeleitet. Der Strom wird durch einen Kreislauf geleitet, der ein Primär-Sieb und einen perforierten Korb, welche zum Zurückhalten großer Schmutzteilchen dienen, sowie eine Kammer umfasst. Die Kammer befindet sich unterhalb des Primär-Siebes und umgibt den Korb zumindest teilweise. Zum Zurückhalten feiner Schmutzteilchen weist die Kammer ein Filterelement auf. Das Verfahren schließt auch einen Schritt ein, bei dem mittels einer geeigneten Zusatzpumpe ein Teil des Stroms von Spülflüssigkeit an einem Punkt in dem Kreislauf stromab von dem Filterelement und/oder dem Primär-Sieb abgesaugt wird und der abgesaugte Teil zu einem zusätzlichen Filterelement geleitet wird, um feine Schmutzteilchen zurückzuhalten. Nach dem Filtern wird dieser Teil zu dem Strom von Spülflüssigkeit zurückgeführt.From the EP 0 990 413 A1 For example, a method for filtering the rinsing liquid in a dishwasher is known. In this case, the flow of rinsing liquid from the container is sucked by a main circulating pump and introduced via a plurality of spray nozzles back into the container. The stream is passed through a circuit comprising a primary screen and a perforated basket which serve to retain large debris and a chamber. The chamber is located below the primary screen and surrounds the basket at least partially. For retaining fine dirt particles, the chamber has a filter element. The method also includes a step of aspirating a portion of the flow of irrigation fluid at a point in the circuit downstream of the filter element and / or the primary screen by means of a suitable booster pump and directing the aspirated portion to an additional filter element. to retain fine dirt particles. After filtering, this part is returned to the flow of rinse liquid.

Aus der DE 29 45 929 A1 ist ein selbstreinigendes Sieb für eine Geschirrspülmaschine bekannt, welches aus zwei Scheiben besteht, die eine Vielzahl von parallel zueinander verlaufenden, schmalen Schlitzen aufweisen. Dabei sitzt eine Scheibe ortsfest im Flüssigkeitsstrom, während die andere Scheibe parallel zur ersten Scheibe in Abhängigkeit von der Strömungsrichtung an dieser anliegend oder abgehoben geführt ist. Dabei sind beide Scheiben bezüglich der Schlitzrichtung um etwa 90° gegeneinander versetzt sind.From the DE 29 45 929 A1 is a self-cleaning sieve for a dishwasher known, which consists of two discs, a plurality of parallel to each other have running, narrow slots. In this case, a disc sits stationary in the liquid flow, while the other disc is guided parallel to the first disc depending on the flow direction at this fitting or lifted. Both discs are offset relative to each other with respect to the slot direction by about 90 °.

Aus der DE-OS 2 249 603 sowie der DE-OS 29 22 549 sind schließlich Filter für den großindustriellen Einsatz bekannt, welche aufgrund ihrer variablen Filterabstände bzw. - durchmesser selbstreinigende Eigenschaften aufweisen.From the DE-OS 2 249 603 as well as the DE-OS 29 22 549 Finally, filters are known for large industrial use, which have self-cleaning properties due to their variable filter spacings or - diameter.

Die Aufgabe der vorliegenden Erfindung besteht darin, eine Geschirrspülmaschine anzugeben, welche eine manuelle Reinigung eines zum Rückhalten von Verunreinigungen eingesetzten Filterelements überflüssig macht, wobei die qualitativen Eigenschaften der Geschirrspülmaschine hinsichtlich Energieverbrauch und Reinigungsleistung optimiert sein sollen.The object of the present invention is to provide a dishwasher which makes manual cleaning of a filter element used for retaining impurities superfluous, wherein the qualitative properties of the dishwasher should be optimized in terms of energy consumption and cleaning performance.

Diese Aufgabe wird durch eine Geschirrspülmaschine mit den Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen ergeben sich jeweils aus den abhängigen Ansprüchen.This object is achieved by a dishwasher with the features of claim 1. Advantageous embodiments will be apparent from the dependent claims.

In einer erfindungsgemäßen Geschirrspülmaschine mit wenigstens einem im Wesentlichen geschlossenen Wasserkreislauf in dem Spülflüssigkeit nach Maßgabe einer Programmsteuereinheit umwälzbar ist, ist die Spülflüssigkeit beim Umwälzen zur Filterung von Verunreinigungen durch wenigstens ein Filterelement förderbar. Dabei besteht das wenigstens eine Filterelement aus Fadenelementen, welche in einem gespannten Zustand zur Reinigung der Spülflüssigkeit und in einem entspannten Zustand zum Reinigen des Filterelements angeordnet sind.In a dishwasher according to the invention with at least one substantially closed water cycle in the rinsing liquid in accordance with a program control unit is circulated, the rinsing liquid during circulation for filtering impurities by at least one filter element is conveyed. In this case, the at least one filter element consists of thread elements which are arranged in a tensioned state for cleaning the rinsing liquid and in a relaxed state for cleaning the filter element.

In einer weiteren Ausgestaltung sind die Fadenelemente an Halteelementen angeordnet und im gespannten Zustand im Wesentlichen in einer Ebene oder in gekrümmter Form, z. B. Zylinderform, angeordnet.In a further embodiment, the thread elements are arranged on holding elements and in the tensioned state substantially in a plane or in a curved shape, for. B. cylindrical shape arranged.

Gemäß einer Ausführungsform ist in der Geschirrspülmaschine ein weiterer Wasserkreislauf vorgesehen, durch welchen die Spülflüssigkeit nach Maßgabe der Programmsteuereinheit gewälzt wird, wenn das Filterelement mit Verunreinigungen belegt ist, um die Entschmutzung des Filterelements zu bewirken. Das Vorsehen eines weiteren Wasserkreislaufs ermöglicht es in vorteilhafter Weise, die Selbstreinigung des Filterelements auch während eines Spülprogrammabschnitts vorzunehmen, ohne dass hierzu ein Abpumpen der in der Geschirrspülmaschine gerade verwendeten Spülflüssigkeit erfolgen müsste. Das Vorsehen des weiteren Wasserkreislaufs verhindert weiterhin zuverlässig, dass von dem Filterelement abgelöste Verunreinigungen in den geschlossenen Wasserkreislauf wandern können, wodurch ein Festsetzen dieser gelösten Verunreinigungen an dem zu spülenden Spülgut vermieden wird.According to one embodiment, a further water circuit is provided in the dishwasher, through which the rinsing liquid is circulated in accordance with the program control unit, when the filter element is covered with impurities, to effect the removal of dirt from the filter element. The provision of another water cycle advantageously makes it possible to carry out the self-cleaning of the filter element during a wash program section, without the need for pumping out the dishwashing liquid currently being used in the dishwasher. The provision of the further water cycle further reliably prevents contaminants detached from the filter element from migrating into the closed water loop, thereby avoiding the settling of these dissolved contaminants on the items to be washed.

In einer zweckmäßigen Ausgestaltung ist das Filterelement derart am oder in einem Pumpentopf der Geschirrspülmaschine eingebaut, dass dieses von der im weiteren Wasserkreislauf strömenden bzw. geförderten Spülflüssigkeit gut umspült wird. Hierdurch ist gewährleistet, dass alle oder zumindest ein Großteil der Verunreinigungen, die sich an dem Filterelement festgesetzt haben, durch die in dem weiteren Wasserkreislauf umgewälzte Spülflüssigkeit lösen lassen.In an expedient embodiment, the filter element is installed on or in a sump of the dishwasher such that it is well bathed by the rinsing liquid flowing or conveyed in the further water cycle. This ensures that all or at least a large part of the impurities that have settled on the filter element can be solved by the rinsing fluid circulated in the further water cycle.

In einer weiteren Ausgestaltung weist das Filterelement eine veränderbare Maschen- oder Spaltweite zur Bereitstellung eines ersten und eines zweiten Betriebszustands auf, wobei das Filterelement in dem ersten Betriebszustand die Filterung von Verunreinigungen aus der in dem Wasserkreislauf befindlichen Verunreinigungen vornimmt und in dem zweiten Betriebszustand das Lösen der in dem Filterelement gefangenen Verunreinigungen beim Umströmen der durch den weiteren Wasserkreislauf geförderten Spülflüssigkeit ermöglicht. Durch den Einsatz eines derartigen Filterelements ist die Reinigung von Verunreinigungen erleichtert, da durch eine veränderte Maschen- oder Spaltweite, insbesondere eine Vergrößerung, Rückstände beim Durchströmen des Filterelements mit Spülflüssigkeit einfach entfernbar sind. Durch Einstellen einer engen Maschen- oder Spaltweite hingegen wird eine räumlich gleichmäßige Schicht des Filtriermaterials ausgebildet, die eine große Aufnahmekapazität aufweist und einen hohen Reinigungsgrad der Spülflüssigkeit beim Umwälzen in dem geschlossenen Wasserkreislauf ermöglicht.In a further embodiment, the filter element has a variable mesh or gap width for providing a first and a second operating state, wherein the filter element in the first operating state, the filtering of impurities from the impurities in the water circulation carries out and in the second operating state, the release of the in the filter element trapped impurities when flowing through the funded by the further water circulation rinsing allows. Through the use of such a filter element, the cleaning of impurities is facilitated, as are easily removable by an altered mesh or gap width, in particular an increase, residues when flowing through the filter element with rinsing liquid. By contrast, by setting a narrow mesh or gap width, a spatially uniform layer of the filtration material is formed, which has a large absorption capacity and enables a high degree of cleaning of the rinsing liquid during circulation in the closed water cycle.

In einer weiteren Ausgestaltung ist vorgesehen, in dem weiteren Wasserkreislauf ein weiteres Filterelement anzuordnen. Dadurch werden die von dem Filterelement abgelösten Verunreinigungen in dem weiteren Filterelement des weiteren Wasserkreislaufs gehalten, wodurch die das Filterelement durchströmende Spülflüssigkeit mit zunehmender Fortdauer des Umwälzens in dem weiteren Wasserkreislauf von immer mehr Rückständen befreit ist. Mit anderen Worten ausgedrückt bedeutet dies, dass die Verunreinigungen aus dem geschlossenen Wasserkreislauf, dem Pumpentopf sowie dem Filterelement beseitigt werden, wodurch im Ergebnis das Spülgut immer mit bestmöglich gefilterter Spülflüssigkeit beaufschlagt wird. Darüber hinaus wird die Spülleistung durch ein sich zunehmend verstopfendes Filterelement nicht beeinträchtigt, da durch das Betätigen des weiteren Wasserkreislaufs ein Filterelement mit konstanter Filterleistung geschaffen wird.In a further embodiment, it is provided to arrange a further filter element in the further water cycle. Characterized the detached from the filter element impurities are held in the further filter element of the further water cycle, whereby the flushing liquid flowing through the filter element with increasing continuation of the circulation in the further water cycle freed from more and more residues is. In other words, this means that the impurities from the closed water circuit, the sump and the filter element are eliminated, as a result, the wash ware is always applied with the best possible filtered rinsing liquid. In addition, the flushing performance is not affected by an increasingly clogging filter element, since by actuation of the further water cycle, a filter element with constant filter performance is created.

Zweckmäßigerweise ist das weitere Filterelement in einem Sammelbehälter angeordnet. Dies ermöglicht es, die in dem weiteren Wasserkreislauf geförderten Verunreinigungen zu sammeln.Conveniently, the further filter element is arranged in a collecting container. This makes it possible to collect the promoted in the wider water cycle impurities.

In einer weiteren Ausgestaltung weist das weitere Filterelement eine veränderbare Maschen- oder Spaltweite zur Bereitstellung eines ersten und eines zweiten Betriebszustands auf, wobei das weitere Filterelement im ersten Betriebszustand die Filterung von Verunreinigungen der in dem weiteren Wasserkreislauf geförderten Spülflüssigkeit vornimmt und im zweiten Betriebszustand das Lösen der in dem weiteren Filterelement gefangenen Verunreinigungen beim Umströmen des weiteren Filterelements mit Spülflüssigkeit des weiteren Wasserkreislaufs ermöglicht. Mit anderen Worten ist somit auch das weitere Filterelement selbstreinigend ausgeführt. Dies stellt eine konstante Filterleistung des zweiten Filterelements während des Betriebs des weiteren Wasserkreislaufs sicher.In a further embodiment, the further filter element has a variable mesh or gap width for providing a first and a second operating state, wherein the further filter element in the first operating state, the filtering of impurities promoted in the further water circulation rinse liquid and in the second operating state, the release of the Impurities trapped in the further filter element when flowing around the further filter element with rinsing liquid of the further water cycle. In other words, therefore, the further filter element is designed to be self-cleaning. This ensures a constant filtering performance of the second filter element during operation of the further water cycle.

Gemäß einer anderen Ausgestaltung ist der weitere Wasserkreislauf in einen Wasserablauf integriert, so dass die in dem weiteren Wasserkreislauf geförderte Spülflüssigkeit nach Maßgabe der Programmsteuereinheit wahlweise der Geschirrspülmaschine oder dem Abwasserablauf zuführbar ist. Dabei wird mit Vorteil der weitere Wasserkreislauf derart betrieben, dass sich das weitere Filterelement im ersten Betriebszustand befindet, wenn die Spülflüssigkeit in der Geschirrspülmaschine umgewälzt wird. Demgemäß befindet sich das weitere Filterelement im zweiten Betriebszustand, in dem dieses ein Reinigen ermöglicht, wobei die Verunreinigungen dem Wasserablauf zugeführt werden. Nach einem "Zwischenspeichern" der Verunreinigungen in dem weiteren Filterelement bzw. dem Sammelbehälter, werden die Verunreinigungen aus der Geschirrspülmaschine transportiert.According to another embodiment, the further water circuit is integrated into a water drain, so that the conveyed in the further water circulation rinse liquid can be supplied according to the program control unit either the dishwasher or the wastewater drain. In this case, the further water circuit is advantageously operated such that the further filter element is in the first operating state when the rinsing liquid is circulated in the dishwasher. Accordingly, the further filter element is in the second operating state in which this allows a cleaning, wherein the impurities are supplied to the water drain. After a "temporary storage" of the impurities in the further filter element or the collecting container, the impurities are transported out of the dishwasher.

Ein Verfahren zum Betreiben einer Geschirrspülmaschine mit einem mehrere Programmabschnitte umfassenden Spülprogramm, umfasst die folgenden Schritte: Das Filterelement wird während des Ablaufs des Spülprogramms in einem ersten Betriebszustand betrieben, in dem dieses eine Filterung der Spülflüssigkeit von Verunreinigungen des geschlossenen Wasserkreislaufs übernimmt. Nach Maßgabe der Programmsteuereinheit oder bei Detektion einer definierten Belegung des Filterelements mit Verunreinigungen wird der weitere Wasserkreislauf aktiviert und das Filterelement in einem zweiten Betriebszustand zum Ablösen der in oder an ihm vorhandenen Verunreinigungen gebracht. In einer Ausgestaltung des Betriebsverfahrens wird das zweite Filterelement bei aktiviertem weiteren Wasserkreislauf in seinem ersten Betriebszustand betrieben, um die in dem weiteren Wasserkreislauf geförderte Spülflüssigkeit von Verunreinigungen zu befreien.A method for operating a dishwasher with a program program comprising several program sections, comprises the following steps: The filter element is operated during the course of the wash program in a first operating state, in which this takes over a filtering of the washing liquid of impurities of the closed water cycle. In accordance with the program control unit or upon detection of a defined occupancy of the filter element with impurities of the further water cycle is activated and brought the filter element in a second operating state for detachment of impurities present in or on it. In one embodiment of the operating method, the second filter element is operated in activated further water circuit in its first operating state to free the conveyed in the further water circulation rinsing fluid from impurities.

In einer anderen Ausgestaltung des Betriebsverfahrens wird das weitere Filterelement nach Abschluss des Spülprogramms oder nach Maßgabe der Programmsteuereinheit in einen zweiten Betriebszustand verbracht, in dem die an oder in dem weiteren Filterelement befindlichen Verunreinigungen durch die in dem weiteren Wasserkreislauf geförderte Spülflüssigkeit aus dem weiteren Filterelement ausgespült werden.In another embodiment of the operating method, the further filter element is spent after completion of the wash program or in accordance with the program control unit in a second operating state in which the impurities located on or in the further filter element are flushed out of the further filter element by the rinsing liquid conveyed in the further water cycle ,

Gemäß einer weiteren Ausgestaltung des Betriebsverfahrens wird die in dem weiteren Wasserkreislauf geförderte Spülflüssigkeit während des zweiten Betriebszustands des weiteren Filterelements dem Wasserablauf zugeführt.According to a further embodiment of the operating method, the rinsing liquid conveyed in the further water cycle is supplied to the water outlet during the second operating state of the further filter element.

Die erfindungsgemäße Geschirrspülmaschine ermöglicht es somit in vorteilhafter Weise, eine Selbstreinigung des Filterelements des geschlossenen Wasserkreislaufs auch während eines Spülprogrammabschnitts vorzunehmen anstatt grundsätzlich das Spülprogrammende abzuwarten, wie dies im Stand der Technik vorgeschlagen wird. Hierdurch kann die Reinigungsleistung während eines Spülprogrammabschnitts auf konstant hohem Niveau gehalten werden, ohne dass der Geschirrspülmaschine zusätzliches Frischwasser zugeführt werden müsste.The dishwashing machine according to the invention thus advantageously makes it possible to carry out a self-cleaning of the filter element of the closed water circuit during a wash program section instead of basically waiting for the wash program end, as proposed in the prior art. As a result, the cleaning performance during a Spülprogrammabschnitts be kept at a consistently high level without the dishwasher additional fresh water would have to be supplied.

Die Erfindung und deren Vorteile werden nachfolgend anhand der Zeichnung beispielhaft näher erläutert. Es zeigen:

Fig. 1
eine schematische Darstellung einer Geschirrspülmaschine mit einem weiteren Wasserkreislauf,
Fig. 2a, 2b
eine schematische Darstellung eines beispielhaft in der in Fig. 1 dargestellten Geschirrspülmaschine einsetzbaren Filterelements in einer Seitenansicht und einem Querschnitt, wobei das Filterelement in einem ersten Betriebszustand dargestellt ist, und
Fig. 3a, 3b
eine schematische Darstellung eines beispielhaft in der in Fig. 1 dargestellten Geschirrspülmaschine einsetzbaren Filterelements in einer Seitenansicht und einem Querschnitt, wobei das Filterelement in einem zweiten Betriebszustand dargestellt ist.
The invention and its advantages will be explained in more detail by way of example with reference to the drawing. Show it:
Fig. 1
a schematic representation of a dishwasher with another water cycle,
Fig. 2a, 2b
a schematic representation of an example in the in Fig. 1 illustrated dishwasher filter element in a side view and a cross section, wherein the filter element is shown in a first operating state, and
Fig. 3a, 3b
a schematic representation of an example in the in Fig. 1 shown dishwasher filter element in a side view and a cross section, wherein the filter element is shown in a second operating state.

In Fig. 1 ist eine Geschirrspülmaschine 1 in einer schematischen Ansicht dargestellt. Die Geschirrspülmaschine 1 umfasst im wesentlichen einen Spülraum 2, in dem nicht dargestelltes Spülgut angeordnet ist, einen Spülflüssigkeitskreislauf 6, einen (in der Figur nicht näher dargestellten) Wasserzulauf und einen Wasserablauf 11. Das Spülgut ist im Spülraum 2 zwischen Wasch- oder Sprüharmen 3 angeordnet. Unterhalb des Spülguts und der Wascharme 3 ist eine Spülwanne 4 angeordnet, welche im Spülraum vorhandene Spülflüssigkeit in einen Pumpentopf 5 leitet. Der Pumpentopf 5 gehört zu dem Spülflüssigkeitskreislauf 6, in dem die für einen Waschvorgang benötigte Spülflüssigkeit 7 umgewälzt wird. Während eines Waschvorganges, der die Programmabschnitte Vorspülen, Reinigen, Zwischenspülen und Klarspülen umfassen kann, wird dem Pumpentopf 5 über eine Leitung 8 Spülflüssigkeit entnommen und über ein Filterelement 14 zu einer Pumpe 9 geführt. Von der Pumpe 9 wird die Spülflüssigkeit nach Durchlaufen eines Durchlauferhitzers (nicht dargestellt) über Leitungen 10 zu den Wascharmen 3 geführt und von diesen in den Spülraum 2 eingesprüht. Im Spülraum 2 läuft die Spülflüssigkeit 7 dann über die Spülwanne 4 wieder in den Pumpentopf 5. Mit dem Pumpentopf 5 steht der Wasserablauf 11 in Verbindung, über den die Spülflüssigkeit ableitbar ist. Beispielsweise wird nach jedem Waschgang ein Teil der Spülflüssigkeit oder auch die gesamte Spülflüssigkeit über den Wasserablauf 11 abgeleitet. Ein Auffüllen des Pumpentopfs erfolgt mit Hilfe des Wasserzulaufs, der Frischwasser zur Verfügung stellt. Darüber hinaus kann die Geschirrspülmaschine 1 noch weitere, in der Figur nicht dargestellte Elemente, wie z.B. eine Einrichtung für die Spülmittelzugabe, eine Enthärtungsanlage, Sensoren und dergleichen aufweisen.In Fig. 1 a dishwasher 1 is shown in a schematic view. The dishwasher 1 essentially comprises a washing compartment 2, in which not shown Dishware is arranged, a Spülflüssigkeitskreislauf 6, a (not shown in the figure) water inlet and a water outlet 11. The items to be washed is arranged in the washing compartment 2 between washing or spraying 3. Below the items to be washed and the washing arms 3, a rinsing pan 4 is arranged, which passes rinsing liquid present in the washing compartment in a sump 5. The sump 5 belongs to the rinsing liquid circuit 6, in which the rinsing liquid 7 required for a washing process is circulated. During a washing process, which may include the program sections pre-rinsing, cleaning, intermediate rinsing and rinsing, the sump 5 is removed via a line 8 rinsing liquid and passed through a filter element 14 to a pump 9. From the pump 9, the rinsing liquid is passed through lines 10 to the washing arms 3 after passing through a water heater (not shown) and sprayed by them into the washing compartment 2. In the washing compartment 2, the rinsing liquid 7 then passes through the rinsing tank 4 back into the sump 5. With the sump 5, the water outlet 11 is connected, via which the rinsing liquid can be derived. For example, a portion of the rinsing liquid or the entire rinsing liquid is discharged via the water outlet 11 after each wash cycle. A filling of the sump is done with the help of the water inlet, which provides fresh water. In addition, the dishwasher 1 may have further, not shown in the figure elements, such as a device for the addition of detergent, a water softening system, sensors and the like.

Durch das Beaufschlagen des Spülgutes mit Spülflüssigkeit werden Verunreinigungen von diesem abgelöst, welche sich zunächst in dem Pumpentopf 5 sammeln, um dann durch den Betrieb der Pumpe 9 in dem Filterelement 14 aus der umgewälzten Spülflüssigkeit gefiltert zu werden. Je nach Verschmutzungsgrad des Spülgutes oder der Anzahl der bereits durchgeführten Spülprogrammabschnitte ist das Filterelement 14 mehr oder weniger mit Verunreinigungen beaufschlagt. Dies kann unter Umständen dazu führen, dass durch die Pumpe 9 nicht mehr ausreichend Spülflüssigkeit aus dem Pumpentopf 5 gefördert werden kann, wodurch das Spülgut infolgedessen mit weniger Spülflüssigkeit beaufschlagt wird, so dass sich das Spülergebnis verschlechtert.By applying the rinsing with rinsing liquid impurities are removed from this, which initially collect in the sump 5, to then be filtered by the operation of the pump 9 in the filter element 14 from the circulating rinsing liquid. Depending on the degree of soiling of the items to be washed or the number of wash program sections already carried out, the filter element 14 is more or less exposed to impurities. Under certain circumstances, this can lead to insufficient pumping liquid being able to be conveyed out of the sump 5 by the pump 9, as a result of which the wash ware is consequently subjected to less washing liquid, so that the wash result worsens.

Um ein manuelles Reinigen des Filterelements 14 zu vermeiden, ist dieses als selbstreinigendes Filterelement ausgeführt. Ein solches, sich selbstreinigendes Filterelement ist beispielhaft in den Figuren 2 und 3 dargestellt, wobei in Fig. 2 ein erster Betriebszustand gezeigt ist, in welchem eine Filterung des durch es hindurch geförderte Spülflüssigkeit bewirkt wird. Figur 3 zeigt das Filterelement in einem zweiten Betriebszustand, in welchem eine Selbstreinigung möglich ist. Die in den Figuren dargestellten Filterelemente werden dabei senkrecht zur Blattebene durchströmt.In order to avoid a manual cleaning of the filter element 14, this is designed as a self-cleaning filter element. Such a self-cleaning filter element is exemplary in the Figures 2 and 3 shown, in Fig. 2 a first operating state is shown, in which a filtering of the conveyed through it rinsing liquid is effected. FIG. 3 shows the filter element in a second operating state in which a self-cleaning is possible. The filter elements shown in the figures are traversed perpendicular to the sheet plane.

Das Filterelement weist zu diesem Zweck in einem mit Führungen 31 ausgebildeten Gehäuse 30 angeordnete Halteelemente 32 auf, zwischen denen Fadenelemente 33, z.B. aus Metall, einem Kunststoff oder einem sonstigen Material, angeordnet sind. Durch Spannen der Fadenelemente 33 entsteht die in Fig. 2a gezeigte parallele Ausrichtung mit definiertem Abstand zueinander. Je nach erwünschter Filterwirkung kann der Abstand durch Befestigen der Fadenelemente 33 in den Halteelementen 32 definiert werden. Das Spannen und Entspannen der Fadenelemente 33 mit den Halteelementen 32 erfolgt über entsprechende Vorrichtungen, z. B. Spindeln oder Hydraulikvorrichtungen. In der Seitenansicht der Fig. 2b ist ersichtlich, dass sämtliche Fadenelemente 33 in einer Ebene liegen, wodurch eine gute Filterwirkung sichergestellt ist. Wird zumindest eines der beiden Halteelemente 32 in Richtung des anderen Halteelementes bewegt, so können sich die Fadenelemente 33 in der in der Figur gezeigten Weise entspannen, wodurch die Abstände in mehr oder minder zufälliger Weise vergrößert werden. Beim Durchströmen des Filterelements mit Spülflüssigkeit in dem zweiten Betriebszustand können dann die an oder in ihm gehaltenen Verunreinigungen ausgespült werden.The filter element has for this purpose in a trained with guides 31 housing 30 holding elements 32, between which thread elements 33, for example made of metal, a plastic or other material, are arranged. By tensioning the thread elements 33 is formed in Fig. 2a shown parallel alignment with a defined distance from each other. Depending on the desired filter effect, the distance can be defined by fastening the thread elements 33 in the holding elements 32. The tensioning and relaxing of the thread elements 33 with the holding elements 32 via corresponding devices, for. As spindles or hydraulic devices. In the side view of Fig. 2b It can be seen that all thread elements 33 lie in one plane, whereby a good filtering effect is ensured. If at least one of the two holding elements 32 is moved in the direction of the other holding element, then the thread elements 33 can relax in the manner shown in the figure, whereby the distances are increased in more or less random manner. When flowing through the filter element with rinsing liquid in the second operating state, the impurities held on or in it can then be rinsed out.

Der Selbstreinigungsvorgang des Filters 14 kann entweder durch eine Programmsteuereinheit gesteuert (in den Figuren nicht dargestellt) oder bei Detektion einer definierten Belegung des Filterelements 14 vorgenommen werden. Mit zunehmender Belegung des Filterelements 14 verringert sich die durch die Pumpe 9 geförderte Spülflüssigkeit. Durch die nach dem Filterelement 14 gemessene geförderte Menge an Spülflüssigkeit kann dann auf die Belegung des Filterelements geschlossen werden.The self-cleaning process of the filter 14 can either be controlled by a program control unit (not shown in the figures) or upon detection of a defined occupancy of the filter element 14. With increasing occupancy of the filter element 14, the funded by the pump 9 flushing liquid is reduced. By the measured after the filter element 14 funded amount of flushing liquid can then be closed to the assignment of the filter element.

Zur Reinigung des Filterelements 14 wird, wie in Verbindung mit der Fig. 3 beschrieben, das Filterelement 14 in seinen zweiten Betriebszustand verbracht. Gleichzeitig wird eine weitere Pumpe 13 in Gang gesetzt, welche die in dem Pumpentopf 5 befindliche Spülflüssigkeit 7 durch einen weiteren Wasserkreislauf 15 fördert. Die Pumpe 13 ist in dem weiteren Wasserkreislauf 15 gelegen, welcher darüber hinaus einen Sammelbehälter 16, in welchem ein weiteres Filterelement 17 angeordnet ist, aufweist. Ausgangsseitig ist der Sammelbehälter 16 über ein Ventil 18 wahlweise mit dem Wasserablauf 11 oder einer Leitung 20 verbindbar, welche in dem weiteren Wasserkreislauf 15 umgewälzte Spülflüssigkeit zurück in den Pumpentopf 5 fördert.To clean the filter element 14, as in connection with the Fig. 3 described, the filter element 14 spent in its second operating state. At the same time a further pump 13 is set in motion, which promotes the flushing liquid 7 located in the sump 5 by a further water circuit 15. The pump 13 is located in the further water circuit 15, which also has a collecting container 16, in which a further filter element 17 is arranged. On the output side is the Sump 16 via a valve 18 selectively connected to the water outlet 11 or a line 20 which promotes circulating in the further water circulation 15 rinsing liquid back into the sump 5.

Um eine Selbstreinigung des Filterelements 14 bewirken zu können, muss dieses in geeigneter Weise von der durch den weiteren Wasserkreislauf 15 geförderten Spülflüssigkeit umströmt werden. In der Praxis wird das Filterelement 14 deshalb an geeigneter Stelle in der Leitung 8 oder direkt am oder im Pumpentopf 5 angeordnet werden.In order to be able to effect a self-cleaning of the filter element 14, it must be flowed around in a suitable manner by the rinsing liquid conveyed through the further water circuit 15. In practice, the filter element 14 will therefore be arranged at a suitable location in the conduit 8 or directly on or in the sump 5.

Die von dem Filterelement 14 abgelösten Verunreinigungen werden über die Pumpe 13 sowie die Leitung 19 durch das weitere Filterelement 17 aufgefangen, welches bevorzugt ebenfalls selbstreinigend ausgeführt ist. Die durch den weiteren Wasserkreislauf 15 geförderte Spülflüssigkeit ist somit am Ausgang des Sammelbehälters 16 gereinigt, und wird, sofern der Wasserkreislauf während eines Spülprogrammabschnitts betätigt wurde, dem Pumpentopf 5 zugeführt. Nach einer bestimmten Zeitspanne kann der weitere Wasserkreislauf 15 deaktiviert werden, wobei gleichzeitig das Filterelement 14 in seine erste Betriebsposition zurückgebracht wird. Anschließend kann der unterbrochene Spülprogrammabschnitt fortgesetzt werden. Natürlich ist es auch möglich, die Selbstreinigung des Filterelements 14 am Ende eines Spülprogrammabschnitts vorzunehmen. In diesem Fall könnte beispielsweise die durch das weitere Filterelement 17 gereinigte Spülflüssigkeit für den nächsten Spülprogrammabschnitt hergenommen werden, so dass auf die Zuführung von Frischwasser verzichtet werden könnte.The detached from the filter element 14 impurities are collected via the pump 13 and the line 19 through the further filter element 17, which is preferably also carried out self-cleaning. The funded by the further water circulation 15 rinsing liquid is thus cleaned at the outlet of the collecting container 16, and, if the water cycle was actuated during a Spülprogrammabschnitts, fed to the sump 5. After a certain period of time, the further water circuit 15 can be deactivated, at the same time the filter element 14 is returned to its first operating position. Subsequently, the interrupted rinse program section can be continued. Of course it is also possible to carry out the self-cleaning of the filter element 14 at the end of a washing program section. In this case, for example, the rinsing liquid cleaned by the further filter element 17 could be taken for the next rinsing program section, so that the supply of fresh water could be dispensed with.

Da nunmehr die von dem Spülgut abgelösten Verunreinigungen in dem weiteren Filterelement 17 gefangen sind, und sich die Reinigungswirkung des weiteren Filterelements 17 mit zunehmender Betriebsdauer des weiteren Wasserkreislaufs 15 verschlechtert, findet eine Selbstreinigung des weiteren Filterelements 17 immer dann statt, wenn die Spülflüssigkeit eines Spülprogrammabschnitts dem Wasserablauf 11 zugeführt werden soll. Mit dem entsprechenden Schalten des Ventils 18 wird somit das weitere Filterelement in seinen zweiten Betriebszustand versetzt, so dass die aus dem Pumpentopf 5 über die Pumpe 13 geförderte Spülflüssigkeit die in dem weiteren Filterelement 17 gefangenen Verunreinigungen ablösen kann, welche dann dem Wasserablauf zugeführt wird.Since now detached from the items to be washed contaminants are trapped in the other filter element 17, and the cleaning effect of the other filter element 17 deteriorates with increasing operating time of the further water circuit 15, a self-cleaning of the further filter element 17 always takes place when the rinsing liquid of a Spülprogrammabschnitts the Water outlet 11 is to be supplied. With the appropriate switching of the valve 18 thus the further filter element is set in its second operating state, so that the pumped from the sump 5 via the pump 13 rinsing liquid can replace the trapped in the other filter element 17 impurities, which is then fed to the water outlet.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11 Geschirrspülmaschinedishwasher 22 SpülraumWash cabinet 33 Sprüharmspray arm 44 Spülwannewash tub 55 Pumpentopfsump 66 WasserkreislaufWater cycle 77 Spülflüssigkeitrinse 88th Leitungmanagement 99 Pumpepump 1010 Leitungmanagement 1111 Wasserablaufwater drain 1313 Pumpepump 1414 Filterelementfilter element 1515 WasserkreislaufWater cycle 1616 SammelbehälterClippings 1717 Filterelementfilter element 1818 VentilValve 1919 Leitungmanagement 2020 Leitungmanagement 3030 Filtergehäusefilter housing 3131 Führungselementguide element 3232 Halteelementretaining element 3333 Fadenelementthread element

Claims (9)

  1. Dishwasher (1) with at least one essentially closed water circuit (6) in which rinsing liquid (7) can be circulated according to the program control unit, it being possible during circulation to convey said rinsing liquid through at least one filter element (14, 17) for the purposes of filtering out dirt, characterised in that at least one filter element (14, 17) consists of thread elements (33) which are arranged under tension for cleaning of the rinsing liquid (7) and in a relaxed state for cleaning the filter element (14, 17).
  2. Dishwasher (1) according to claim 10, characterised in that the thread elements (33) are arranged on securing elements (32), and when under tension are essentially arranged in one level or in bent form, for example cylindrical form.
  3. Dishwasher (1) according to claim 1 or 2, characterised in that a further water circuit (15) is provided, through which rinsing liquid (7) can be circulated according to the program control unit, if the filter element (14) is dirty, in order to effect cleaning of the filter element (14).
  4. Dishwasher according to claim 3, characterised in that the filter element (14) is built onto or into a pump well (5) of the dishwasher in such a way that this is capable of being well flushed by the rinsing liquid flowing in the further water circuit (15).
  5. Dishwasher according to claim 3 or 4, characterised in that the filter element (14) has a variable mesh or column width for the provision of a first and a second operating state where the filter element carries out the filtering of dirt from that located in the water circuit (6) in the first operating state, and in the second operating state enables loosening of the dirt trapped in the filter element (14) upon circumflow of the rinsing liquid supplied through the further water circuit (15).
  6. Dishwasher according to one of claims 3 to 5, characterised in that the further water circuit (15) has a further filter element (17).
  7. Dishwasher according to one of claims 3 to 6, characterised in that the further filter element (17) is arranged in a collection receptacle (16).
  8. Dishwasher according to claim 6 or 7, characterised in that the further filter element (17) has a variable mesh or column width for the provision of a first and a second operating state where the further filter element (17) carries out the filtering of dirt from the rinsing liquid located in the water circuit (15) in the first operating state, and in the second operating state enables loosening of the dirt trapped in the further filter element (17) upon circumflow of the further filter element (17) with rinsing liquid of the further water circuit (15).
  9. Dishwasher according to one of claims 3 to 8, characterised in that the further water circuit (15) is integrated into a water outlet (11) so that the rinsing liquid conveyed in the further water circuit (15) can be conducted according to the program control unit optionally to the water-conducting household appliance or the water outlet (11).
EP05797125.1A 2004-12-23 2005-10-20 Water-conducting household appliance and method for the operation thereof Not-in-force EP1830688B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004062242A DE102004062242A1 (en) 2004-12-23 2004-12-23 Water-conducting household appliance and method for operating the same
PCT/EP2005/055406 WO2006069830A1 (en) 2004-12-23 2005-10-20 Water-conducting household appliance and method for the operation thereof

Publications (2)

Publication Number Publication Date
EP1830688A1 EP1830688A1 (en) 2007-09-12
EP1830688B1 true EP1830688B1 (en) 2013-06-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05797125.1A Not-in-force EP1830688B1 (en) 2004-12-23 2005-10-20 Water-conducting household appliance and method for the operation thereof

Country Status (9)

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US (3) US7909941B2 (en)
EP (1) EP1830688B1 (en)
JP (1) JP2008525072A (en)
KR (1) KR20070089708A (en)
CN (1) CN200987658Y (en)
BR (1) BRPI0519206A2 (en)
DE (1) DE102004062242A1 (en)
RU (1) RU2405404C2 (en)
WO (1) WO2006069830A1 (en)

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EP2499954B1 (en) * 2011-03-17 2017-05-10 Electrolux Home Products Corporation N.V. Dishwasher with a bistable filter
CN104342875A (en) * 2013-07-26 2015-02-11 海尔集团技术研发中心 Washing machine and control method thereof
DE102017217801A1 (en) * 2017-10-06 2019-04-11 BSH Hausgeräte GmbH Water-conducting household appliance and method for operating a water-conducting household appliance
DE102019203809B3 (en) * 2019-03-20 2020-07-02 E.G.O. Elektro-Gerätebau GmbH Water-bearing household appliance and method for its operation
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US8663393B2 (en) 2014-03-04
KR20070089708A (en) 2007-08-31
EP1830688A1 (en) 2007-09-12
RU2405404C2 (en) 2010-12-10
US7909941B2 (en) 2011-03-22
DE102004062242A1 (en) 2006-07-13
WO2006069830A8 (en) 2007-08-16
US20080149138A1 (en) 2008-06-26
JP2008525072A (en) 2008-07-17
US20110114122A1 (en) 2011-05-19
RU2007121897A (en) 2009-01-27
US20130228197A1 (en) 2013-09-05
BRPI0519206A2 (en) 2008-12-30
WO2006069830A1 (en) 2006-07-06
US8574376B2 (en) 2013-11-05
CN200987658Y (en) 2007-12-12

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