EP2816150B1 - Water-conducting domestic appliance with lye filter - Google Patents

Water-conducting domestic appliance with lye filter Download PDF

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Publication number
EP2816150B1
EP2816150B1 EP14003297.0A EP14003297A EP2816150B1 EP 2816150 B1 EP2816150 B1 EP 2816150B1 EP 14003297 A EP14003297 A EP 14003297A EP 2816150 B1 EP2816150 B1 EP 2816150B1
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EP
European Patent Office
Prior art keywords
filter
ball bed
household device
granulate
bed filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14003297.0A
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German (de)
French (fr)
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EP2816150A2 (en
EP2816150A3 (en
Inventor
Markus Zwimpfer
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V-Zug AG
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V-Zug AG
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Publication date
Application filed by V-Zug AG filed Critical V-Zug AG
Priority to DK14003297.0T priority Critical patent/DK2816150T3/en
Priority to SI201430737T priority patent/SI2816150T1/en
Priority to EP14003297.0A priority patent/EP2816150B1/en
Priority to PL14003297T priority patent/PL2816150T3/en
Publication of EP2816150A2 publication Critical patent/EP2816150A2/en
Publication of EP2816150A3 publication Critical patent/EP2816150A3/en
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Publication of EP2816150B1 publication Critical patent/EP2816150B1/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
    • A47L15/4202—Water filter means or strainers
    • 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
    • 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
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/06—Water supply, circulation or discharge information
    • 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
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements

Definitions

  • the invention relates to a water-conducting household appliance with a line or circulation system and a filter for the flowing in the line system process liquid.
  • Water-conducting household appliance with a line or circulation system and a filter for process fluid are, for example, dishwashers, washing machines or automatic washing machines.
  • the piping system for domestic water appliances can also contain measuring devices which make it possible to monitor or control the processes taking place in the device, in particular the properties of the process fluid in the pipeline system.
  • the optimum surfactant concentration are determined and monitored by means of a suitable measuring device, which allows automatic adjustment of the amount of detergent.
  • Household appliances of this type are for example in EP-2319382 and EP-2422678 disclosed.
  • DE 11 66 156 describes a wet scrubber for dusty air or gases with a ball bed filter. Air enters through a line in the wet scrubber and rips in a manifold liquid droplets of detergent liquid located at a level with. The moist air passes through the ball bed filter, by coarser dust particles are retained.
  • the household appliance has at least one ball bed filter or granulate filter in the line system.
  • the ball bed filter or granulate filter is designed with a self-cleaning system or regeneration system.
  • the self-cleaning system or regeneration system of the filter has, in particular, a backwashing driven by gravity or decoupled from the water pressure in the household line.
  • the construction of a necessary for the backwashing pressure is preferably done by building a water column. This water column can particularly preferably be kept constant by means of an overflow guided in the treatment container on the filter.
  • the backwash in the vicinity of the inlet to the filter has a flow-forming element which prefers peripheral flow or edge flow to a central flow through the ball bed of the filter.
  • the ball bed filter preferably has a main chamber with the balls or the granules, which projects at least partially from above into an outlet chamber.
  • the outlet opening of the filter is preferably located above the lower end of the main chamber, more preferably above the level occupied by the balls at rest.
  • the discharge chamber of the ball bed filter during operation contains sufficient liquid to keep the balls in the main chamber in a state immersed in the liquid.
  • the ball bed filter preferably also has a secondary input filter or prefilter.
  • the input filter is preferably arranged so that not only liquid, which flows through the entrance into the ball bed filter, passes through the input filter, but also liquid, which flows through an overflow from the filter. Due to the overflowing liquid, the pre-filter can be cleaned.
  • the entrance area of the ball bed filter can be designed so that a larger amount of inflowing liquid leaves the entrance area directly through the overflow without passing through the actual filter. For example, less than 50 percent or even less than 20 percent of the fluid entering the entrance of the filter may pass through the actual ball bed filter.
  • the self-cleaning system or regeneration system of the filter can also clean the input filter by rinsing deposits by flow reversal and be discharged into the overflow.
  • the ball bed filter is part of a circulation circuit for the process water in order to filter impurities from the process water.
  • the circulation circuit may include a first, primary circuit and a second, secondary circuit, with a much larger amount of process fluid flowing through the primary circuit than through the secondary circuit.
  • the ball bed filter is preferably part of the secondary circuit in such a configuration.
  • the household appliance has a measuring device in the piping system, which in use serves to determine one or more properties of the process water.
  • the measuring device can be connected to a control system of the household appliance and provide a parameter used for process control.
  • the measuring device may be, for example, a surface tension sensor or a conductivity sensor or a pH sensor or a combination of a plurality of these sensors.
  • the measuring device is mounted in the line system downstream of the ball bed filter. Should the piping system be oriented to change the direction of flow in certain operating conditions, the directional indication "downstream" is given by the direction in which the process water flows most of the time during a complete cycle of operation. By this method of attachment process water flows through the filter first before it passes the measuring device.
  • the measuring device and the ball bed filter are part of a secondary circuit for the process fluid.
  • the water-conducting household appliance is in particular a dishwasher or a washing machine.
  • detergents used which affect the surface tension of the process fluid, so that the surface tension is an important parameter in the control of the device. Further details can be found in EP2319382 ,
  • the invention is described in the context of a washing machine, but it can also be used in other water-leading household appliances, especially in dishwashers.
  • the controller 10 is designed to control the dosage of detergent depending on the signal of the measuring device 9, for example, such that in the process phases provided for the surface tension of the wash liquor has a desired value without too much detergent is used for this purpose. Details are in EP2319382 described.
  • the washing machine further includes a ball bed filter 11, which in the example shown is part of the supply line to the measuring device 9.
  • the ball bed filter 11 is connected via a supply line 111 to the circulation circuit of the washing machine, ie, in operation, a portion of the circulating wash liquor is coupled out and passed to the filter 11.
  • the decoupled part of the wash liquor is separated into two partial streams.
  • the larger partial flow (90-95%) is returned via an overflow on the filter 11 directly into the tub 1.
  • a smaller partial flow of the decoupled wash liquor flows through the filter 11 and is transported via the line 117 to the measuring device 9 and from there back into the tub 1.
  • the filter 11 still connected to a cleaning line 118. Details of the filter 11 and its connections are described in more detail below.
  • Fig. 2-4 show an embodiment of the ball bed filter 11.
  • the elements are housed in a cage that prevents them from traveling with the flow. In normal operation, the elements are forced by the flow against the exit side of the cage and form a filter bed which passes the liquid to be filtered to exit at the exit side of the filter.
  • the properties of the ball bed filter can be determined, among other things, by the number or density, the size and the nature of the particulate elements.
  • the particulate elements are designed so that the ball bed filter 11 retains solids in the process water up to a size of about 0.2 millimeters.
  • the particulate elements of the ball bed filter 11 will be referred to hereinafter as spheres. It should be understood, however, that these elements do not necessarily have to have a spherical shape.
  • the filter 11 has a feed tube 111 in the inlet region.
  • the supply pipe 111 communicates with a main chamber 112 of the filter 11, wherein between the supply pipe 111 and the main chamber 112, a pre-filter 113 is attached.
  • the supply pipe 111 also opens in the inlet region of the filter 11 into an overflow pipe 114.
  • the inlet portion of the filter 11 with the feed tube 111, the opening to the main chamber 112, the pre-filter 113, and the overflow tube 114 is designed and dimensioned such that the majority of the liquid entering through the feed tube 111 directly through the overflow tube 114 the filter 11 again leaves. This flow flows along one side of the pre-filter 113 and can thus exert a cleaning effect on the pre-filter.
  • the openings of the prefilter 113 are dimensioned such that the particulate elements of the ball bed filter 11 can not be washed out of the main chamber 112 through the inlet area.
  • the lattice spacings of the prefilter bars are selected so that the spherical elements can not pass with one in the range of 5 mm to 20 mm and are held in the main chamber 112.
  • FIG. 3A and 3B show the inlet area of the filter 11 in a cross section perpendicular to the flow direction through the feed tube 111 (FIGS. FIG. 3A ) or in cross-section parallel to the flow direction ( FIG. 3B ).
  • the prefilter 113 is composed of six bars arranged substantially parallel to the main flow direction, which block the downwardly directed entrance to the main chamber 112 of the ball bed filter 11.
  • the particulate elements which form the ball bed.
  • the filter 11 is oriented so that the balls are deposited on a perforated plate 115 under the influence of gravity.
  • the openings in the perforated plate 115 are dimensioned such that the particulate elements are retained in the main chamber 112.
  • the pre-filter forms 113 and the perforated plate 115 has a cage which holds the balls of the ball bed filter 11 in the main chamber 112.
  • filtered liquid flows through the perforated plate 115 into an outlet chamber 116 of the filter 11.
  • the outlet chamber 116 has a drain 117.
  • the drain 117 is mounted so that the filtered liquid can drain only when its level exceeds that of the ball bed or at least the perforated plate 115.
  • the level of the ball bed is defined as the height or thickness of the layer which the balls assume when they have settled completely on the perforated plate 115.
  • the ball bed filter 11 is designed such that the particulate elements are below the liquid level in the main chamber 112 of the filter 11, even if no liquid flows through the filter.
  • the filtered liquid flows to the measuring device 9 (see FIG. FIG. 1 ).
  • the surface tension of the liquid can be determined before it is returned to the tub 1 via the return line 12.
  • the overflow pipe 114 in the inlet region of the filter 11 is also connected to the return line 12, so that process water, which flows through the supply pipe 111, but not through the filter 11, is also returned to the tub 1.
  • the ball bed filter 11 is provided with a cleaning system or regeneration system.
  • the regeneration system essentially has a riser 118 through which cleaning liquid can enter from below into the bottom region of the outlet chamber 116.
  • the cleaning liquid tap water, which can flow from the conduit 3 via an air gap 31 in the tube 118. Through the air gap, the regeneration system is isolated from the water pressure in the line 3.
  • the pressure required to clean the filter 11 is determined by the height of the water column or by the hydrostatic pressure in the riser 118.
  • the described cleaning system has no pump or other internal electric drive to build up a water pressure needed to flush the ball bed and is based solely on the action of gravity as a driving force.
  • different pressures can be set via the valve 30 in the line 3.
  • the water flows at least for the most part through the mixing container 4 and via the line 5 in the tub 1.
  • the valve 30 At a low pressure, which is adjusted by the valve 30, the water flows preferably in the hopper 31 and thus in the backwash.
  • This solution can be equipped with a few additional moving elements, the filter system with a self-cleaning.
  • the height of the water column in the tube 118 exceeds the height at which the overflow tube 114 is mounted in the inlet region of the filter 11.
  • the entire filter 11 is quickly filled up to the height of the overflow pipe 114.
  • the balls in the main chamber 112 are swirled apart and residues which have settled between the balls in the normal filter operation are carried by the flow of the rinsing liquid upwards and washed over the overflow pipe 114 from the filter , By the same process and the pre-filter 113 is freed from residues.
  • the cleaning system still has a flow-forming element which is suitable, the effect of To homogenize rinse liquid over the entire cross section of the main chamber of the filter.
  • the perforated plate 115 which closes the main chamber 112 of the filter 11 downwards, designed as such a flow-forming element.
  • the perforated plate 115 thereto in a circumferentially extending edge zone, a greater ratio or density of openings than in its central zone.
  • the perforated plate 115 can have a greater density of openings of the same size at the edge than in the center, as in the example of FIG. 4A or the openings at the edge may have a larger cross-sectional area than openings in the center as in the example of FIG. 4B ,
  • the household appliance is designed for a specific purpose, it is to be understood that the mechanical and electrical components are suitable for this purpose and the controller is designed to control the mechanical and electrical components in such a way that this purpose is achieved.

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft ein Wasser führendes Haushaltsgerät mit einem Leitungs- oder Zirkulationssystem und einem Filter für die im Leitungssystem fliessende Prozessflüssigkeit.The invention relates to a water-conducting household appliance with a line or circulation system and a filter for the flowing in the line system process liquid.

Hintergrundbackground

Wasserführende Haushaltsgerät mit einem Leitungs- oder Zirkulationssystem und einem Filter für Prozessflüssigkeit sind beispielsweise Geschirrspülmaschinen, Waschmaschinen oder Waschtrockenautomaten.Water-conducting household appliance with a line or circulation system and a filter for process fluid are, for example, dishwashers, washing machines or automatic washing machines.

Das Leitungssystem für wasserführende Haushaltsgeräte kann auch Messvorrichtungen enthalten, welche es ermöglichen, die in dem Gerät ablaufenden Prozesse, insbesondere die Eigenschaften der Prozessflüssigkeit im Leitungssystem, zu überwachen oder zu kontrollieren. Insbesondere in einem Geschirrspüler oder in einer Waschmaschine kann z.B. die optimale Tensidkonzentration festgelegt werden und mittels einer geeigneten Messvorrichtung überwacht werden, was eine automatische Einstellung der Waschmittelmenge erlaubt.The piping system for domestic water appliances can also contain measuring devices which make it possible to monitor or control the processes taking place in the device, in particular the properties of the process fluid in the pipeline system. In particular, in a dishwasher or in a washing machine, e.g. the optimum surfactant concentration are determined and monitored by means of a suitable measuring device, which allows automatic adjustment of the amount of detergent.

Haushaltsgeräte dieser Art sind beispielsweise in EP-2319382 und EP-2422678 offenbart.Household appliances of this type are for example in EP-2319382 and EP-2422678 disclosed.

In DE 197 45 428 wird ein Verfahren zur automatischen Trübungsmessung in einem Geschirrspüler beschrieben. Es erfolgt eine Trübungsmessung bevor und nachdem ein Teil des Wassers aus dem Geschirrspüler entfernt worden ist. Diese teilweise Entleerung gestattet die Aufnahme erster und zweiter Grössen von Trübungscharakteristiken, die vor und nach der Teilentleerung aufgenommen werden und die miteinander verglichen werden für eine Analyse des Ausmasses und des Wesens der Partikel innerhalb des Wassers eines Geschirrspülers.In DE 197 45 428 A method for automatic turbidity measurement in a dishwasher is described. There is a turbidity measurement before and after a part of the water has been removed from the dishwasher. This partial evacuation allows for the uptake of first and second quantities of haze characteristics taken before and after the partial evacuation, which are compared for an analysis of the extent and nature of the particles within the water of a dishwasher.

In DE 11 66 156 wird ein Nassabscheider für staubhaltige Luft oder Gase mit einem Kugelbettfilter beschrieben. Luft tritt dabei durch eine Leitung in den Nassabscheider und reisst in einem Krümmer Flüssigkeitströpfchen der sich auf einem Niveau befindlichen Waschmittelflüssigkeit mit. Die feuchte Luft tritt dabei durch den Kugelbettfilter, indem gröbere Staubteilchen zurückgehalten werden.In DE 11 66 156 describes a wet scrubber for dusty air or gases with a ball bed filter. Air enters through a line in the wet scrubber and rips in a manifold liquid droplets of detergent liquid located at a level with. The moist air passes through the ball bed filter, by coarser dust particles are retained.

Für Haushaltsgeräte, in denen Prozesswasser zirkuliert und/oder in denen die Qualität des Prozesswassers von Messvorrichtung überwacht wird, besteht häufig das Bedürfnis, das Prozesswasser von unerwünschten Verunreinigungen und Rückständen eines Reinigungsprozesses möglichst freizuhalten. In Filtern, welche zu diesem Zweck in das Leitungssystem integriert werden, lagern sich jedoch konstruktionsbedingt diese Verunreinigungen und Rückstände mit der Zeit ab, so dass das Leitungssystem blockiert wird und eine Reinigung des Filters durch den Benutzer notwendig wird oder so dass die Messvorrichtung selbst verschmutzt wird.For household appliances in which process water circulates and / or in which the quality of the process water is monitored by the measuring device, there is often the need to keep the process water as free as possible of unwanted impurities and residues of a cleaning process. However, in filters that are integrated into the piping system for this purpose, these contaminants and debris build up over time, thus blocking the piping and necessitating cleaning of the filter by the user or so as to contaminate the measuring apparatus itself ,

Darstellung der ErfindungPresentation of the invention

Es stellt sich die Aufgabe, ein Haushaltsgerät der eingangs genannten Art bereitzustellen, dessen Filter die Notwendigkeit einer Reinigung durch den Benutzer reduziert und insbesondere in der Lage ist, die Verschmutzung einer im Leitungssystem integrierten Messvorrichtung zu reduzieren oder sogar zu verhindern. Diese Aufgabe wird vom Haushaltsgerät gemäss Anspruch 1 gelöst.It has as its object to provide a household appliance of the type mentioned, whose Filter reduces the need for cleaning by the user and in particular is able to reduce the pollution of an integrated in the piping system measuring device or even prevent. This object is achieved by the household appliance according to claim 1.

Demgemäss weist das Haushaltsgerät zumindest einen Kugelbettfilter oder Granulatfilter im Leitungssystem auf. Der Kugelbettfilter oder Granulatfilter ist dabei mit einem Selbstreinigungssystem oder Regenerationssystem ausgestaltet. Das Selbstreinigungssystem oder Regenerationssystem des Filters weist dabei insbesondere eine mittels Schwerkraft angetriebene oder eine vom Wasserdruck in der Haushaltsleitung entkoppelte Rückspülung auf. Der Aufbau eines für die Rückspülung notwendigen Drucks geschieht vorzugsweise durch Aufbau einer Wassersäule. Diese Wassersäule kann besonders bevorzugt durch einen in den Behandlungsbehälter geführten Überlauf am Filter konstant gehalten werden kann.Accordingly, the household appliance has at least one ball bed filter or granulate filter in the line system. The ball bed filter or granulate filter is designed with a self-cleaning system or regeneration system. The self-cleaning system or regeneration system of the filter has, in particular, a backwashing driven by gravity or decoupled from the water pressure in the household line. The construction of a necessary for the backwashing pressure is preferably done by building a water column. This water column can particularly preferably be kept constant by means of an overflow guided in the treatment container on the filter.

Bevorzugterweise weist die Rückspülung in der Nähe zum Eintritt in den Filter ein strömungsformendes Element auf, welches eine periphere Strömung oder Randströmung gegenüber einer zentralen Strömung durch das Kugelbett des Filters bevorzugt.Preferably, the backwash in the vicinity of the inlet to the filter has a flow-forming element which prefers peripheral flow or edge flow to a central flow through the ball bed of the filter.

In einer weiteren Variante weist der Kugelbettfilter bevorzugt eine Hauptkammer mit den Kugeln oder dem Granulat auf, welche zumindest teilweise von oben in eine Austrittskammer hineinragt. Die Auslassöffnung des Filters ist bevorzugterweise oberhalb des unteren Abschlusses der Hauptkammer angeordnet, besonders bevorzugt oberhalb des Niveaus, welche die Kugeln im Ruhezustand einnehmen. Damit enthält die Austrittskammer des Kugelbettfilters im Betrieb genügend Flüssigkeit, um die Kugeln in der Hauptkammer in einem in die Flüssigkeit eingetauchten Zustand zu halten.In a further variant, the ball bed filter preferably has a main chamber with the balls or the granules, which projects at least partially from above into an outlet chamber. The outlet opening of the filter is preferably located above the lower end of the main chamber, more preferably above the level occupied by the balls at rest. Thus, the discharge chamber of the ball bed filter during operation contains sufficient liquid to keep the balls in the main chamber in a state immersed in the liquid.

Der Kugelbettfilter weist bevorzugt noch einen sekundären Eingangsfilter oder Vorfilter auf. Der Eingangsfiltern ist dabei bevorzugterweise so angeordnet, dass nicht nur Flüssigkeit, welche durch den Eingang in den Kugelbettfilter fliesst, den Eingangsfilter passiert, sondern auch Flüssigkeit, welche durch einen Überlauf aus dem Filter fliesst. Durch die überlaufende Flüssigkeit kann der Vorfilter gereinigt werden. Insbesondere kann der Eingangsbereich des Kugelbettfilters so ausgelegt sein, dass eine größere Menge an einströmender Flüssigkeit den Eingangsbereich direkt durch den Überlauf verlässt, ohne den eigentlichen Filter zu passieren. So kann beispielsweise weniger als 50 Prozent oder sogar weniger als 20 Prozent der in den Eingangsbereich des Filters eintretenden Flüssigkeit den eigentlichen Kugelbettfilter passieren.The ball bed filter preferably also has a secondary input filter or prefilter. The input filter is preferably arranged so that not only liquid, which flows through the entrance into the ball bed filter, passes through the input filter, but also liquid, which flows through an overflow from the filter. Due to the overflowing liquid, the pre-filter can be cleaned. In particular, the entrance area of the ball bed filter can be designed so that a larger amount of inflowing liquid leaves the entrance area directly through the overflow without passing through the actual filter. For example, less than 50 percent or even less than 20 percent of the fluid entering the entrance of the filter may pass through the actual ball bed filter.

Durch eine entsprechende Ausgestaltung des Filters kann das Selbstreinigungssystem oder Regenerationssystem des Filters ebenfalls den Eingangsfilter reinigen indem sich durch Strömungsumkehr Ablagerungen freispülen und in den Überlauf abgeführt werden.By a corresponding design of the filter, the self-cleaning system or regeneration system of the filter can also clean the input filter by rinsing deposits by flow reversal and be discharged into the overflow.

In einer bevorzugten Variante der Erfindung ist der Kugelbettfilter Teil eines Zirkulationskreislaufs für das Prozesswasser, um Verunreinigungen aus dem Prozesswasser zu filtern. Der Zirkulationskreislauf kann einem ersten, primären Kreislauf und einen zweiten, sekundären Kreislauf enthalten, wobei durch den primären Kreislauf eine wesentlich größere Menge an Prozessflüssigkeit strömt als durch den sekundären Kreislauf. Der Kugelbettfilter ist bevorzugterweise in einer solchen Konfiguration Teil des sekundären Kreislaufs.In a preferred variant of the invention, the ball bed filter is part of a circulation circuit for the process water in order to filter impurities from the process water. The circulation circuit may include a first, primary circuit and a second, secondary circuit, with a much larger amount of process fluid flowing through the primary circuit than through the secondary circuit. The ball bed filter is preferably part of the secondary circuit in such a configuration.

In einer Variante der Erfindung weist das Haushaltsgerät eine Messvorrichtung im Leitungssystem auf, welche im Gebrauch dazu dient, eine oder mehrere Eigenschaften des Prozesswassers zu bestimmen. Die Messvorrichtung kann dabei mit einem Kontrollsystem des Haushaltsgeräts verbunden sein und einen zur Prozesssteuerung dienenden Parameter liefern. Die Messvorrichtung kann beispielsweise ein Oberflächenspannungssensor sein oder ein Leitfähigkeitssensor oder ein pH Sensor oder eine Kombination von mehreren dieser Sensoren sein. In einer bevorzugten Ausführungsform dieser Variante ist die Messvorrichtung im Leitungssystem stromabwärts vom Kugelbettfilter angebracht. Sollte das Leitungssystem ausgerichtet sein, die Strömungsrichtung in bestimmten Betriebszuständen zu ändern, so ist die Richtungsangabe "stromabwärts" durch die Richtung gegeben, in welcher das Prozesswasser während eines vollständigen Betriebszyklus die meiste Zeit fliesst. Durch diese Art der Anbringung fliesst Prozesswasser zuerst durch den Filter bevor es die Messvorrichtung passiert. In einer bevorzugten Ausführungsform dieser Variante sind die Messvorrichtung und der Kugelbettfilter Teil eines sekundären Kreislaufs für die Prozessflüssigkeit.In a variant of the invention, the household appliance has a measuring device in the piping system, which in use serves to determine one or more properties of the process water. The measuring device can be connected to a control system of the household appliance and provide a parameter used for process control. The measuring device may be, for example, a surface tension sensor or a conductivity sensor or a pH sensor or a combination of a plurality of these sensors. In a preferred embodiment of this variant, the measuring device is mounted in the line system downstream of the ball bed filter. Should the piping system be oriented to change the direction of flow in certain operating conditions, the directional indication "downstream" is given by the direction in which the process water flows most of the time during a complete cycle of operation. By this method of attachment process water flows through the filter first before it passes the measuring device. In a preferred embodiment of this variant, the measuring device and the ball bed filter are part of a secondary circuit for the process fluid.

Beim wasserführenden Haushaltsgerät handelt es sich insbesondere um einen Geschirrspüler oder eine Waschmaschine. Bei Geräten dieser Art werden, wie bereits erwähnt, Waschmittel eingesetzt, welche die Oberflächenspannung der Prozessflüssigkeit beeinflussen, so dass die Oberflächenspannung ein wichtiger Parameter bei der Steuerung des Geräts ist. Nähere Angaben hierzu finden sich in EP2319382 .The water-conducting household appliance is in particular a dishwasher or a washing machine. For devices of this type, as already mentioned, detergents used, which affect the surface tension of the process fluid, so that the surface tension is an important parameter in the control of the device. Further details can be found in EP2319382 ,

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Weitere Ausgestaltungen, Vorteile und Anwendungen der Erfindung ergeben sich aus den abhängigen Ansprüchen und aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:

  • FIG. 1 ein vereinfachtes Diagramm einer Waschmaschine gemäss eines Beispiels der Erfindung,
  • FIG. 2A - 2C verschiedene Ansichten eines Kugelbettfilters gemäss eines Beispiels der Erfindung,
  • FIG. 3A und 3B verschiedene Ansichten des Eintritts- oder Kopfbereichs eines Kugelbettfilters gemäss FIG. 2 und
  • FIG. 4 verschiedene Ausgestaltungen eines strömungsformenden Elements für den Kugelbettfilters gemäss FIG. 2.
Further embodiments, advantages and applications of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Showing:
  • FIG. 1 a simplified diagram of a washing machine according to an example of the invention,
  • FIG. 2A-2C various views of a ball bed filter according to an example of the invention,
  • FIG. 3A and 3B different views of the entrance or head area of a ball bed filter according to FIG. 2 and
  • FIG. 4 various embodiments of a flow-forming element for the ball bed filter according to FIG. 2 ,

Wege zur Ausführung der ErfindungWays to carry out the invention

Im Folgenden wird die Erfindung im Rahmen einer Waschmaschine beschrieben, sie kann jedoch auch bei anderen Wasser führenden Haushaltsgeräten, insbesondere auch bei Geschirrspülern, eingesetzt werden.In the following, the invention is described in the context of a washing machine, but it can also be used in other water-leading household appliances, especially in dishwashers.

Fig. 1 zeigt die wichtigsten Komponenten einer Waschmaschine, namentlich:

  • einen Bottich 1 zur Aufnahme der Waschlauge,
  • eine im Bottich 1 angeordnete Trommel 2, welche im vorliegenden Ausführungsbeispiel um eine horizontale Achse drehbar ist,
  • eine Frischwasserzufuhr 3,
  • einen Mischbehälter 4 zum Mischen von Waschlauge und Waschmittel (Tensid) zur Verwendung als Prozessflüssigkeit,
  • eine Leitung 5 zum Zuführen des Wassers zum Bottich 1,
  • eine Ablaufpumpe 6 zum Abführen von gebrauchter Waschlauge,
  • eine Zirkulationspumpe 7, um Waschlauge vom unteren Bereich des Bottichs durch eine Zirkulationsleitung 8 nach oben zu pumpen,
  • eine Messvorrichtung 9 zum Messen der Oberflächenspannung der Prozesswassers bzw. eines von derselben abhängigen Parameters und
  • eine Steuerung 10 zum Steuern des Geräts.
Fig. 1 shows the most important components of a washing machine, namely:
  • a tub 1 for receiving the wash liquor,
  • a drum 2 arranged in the tub 1, which drum is rotatable about a horizontal axis in the present embodiment,
  • a fresh water supply 3,
  • a mixing container 4 for mixing wash liquor and detergent (surfactant) for use as process liquid,
  • a conduit 5 for supplying the water to the tub 1,
  • a drain pump 6 for discharging spent wash liquor,
  • a circulation pump 7 for pumping up wash liquor from the lower portion of the tub through a circulation passage 8,
  • a measuring device 9 for measuring the surface tension of the process water or a parameter dependent thereon, and
  • a controller 10 for controlling the device.

Die Steuerung 10 ist dazu ausgestaltet, die Dosierung von Waschmittel abhängig vom Signal der Messvorrichtung 9 zu steuern, z.B. derart, dass in den dazu vorgesehenen Prozessphasen die Oberflächenspannung der Waschlauge einen gewünschten Wert hat, ohne dass hierzu zu viel Waschmittel verwendet wird. Details hierzu sind in EP2319382 beschrieben.The controller 10 is designed to control the dosage of detergent depending on the signal of the measuring device 9, for example, such that in the process phases provided for the surface tension of the wash liquor has a desired value without too much detergent is used for this purpose. Details are in EP2319382 described.

Die Waschmaschine enthält weiter einen Kugelbettfilter 11, welcher in dem gezeigten Beispiel Teil der Zufuhrleitung zur Messvorrichtung 9 ist. Der Kugelbettfilter 11 ist über eine Zufuhrleitung 111 an den Zirkulationskreislauf der Waschmaschine angeschlossen, d.h. im Betrieb wird ein Teil der zirkulierenden Waschlauge aus gekoppelt und zum Filter 11 geleitet. Am Filter selbst wird der ausgekoppelte Teil der Waschlauge in zwei Teilströme getrennt. Der größere Teilstrom (90-95%) wird über einen Überlauf am Filter 11 direkt in den Bottich 1 zurückgeleitet. Ein kleinerer Teilstrom der ausgekoppelten Waschlauge fließt durch den Filter 11 und wird über die Leitung 117 zur Messvorrichtung 9 transportiert und von dort zurück in den Bottich 1. Zusätzlich ist der Filter 11 noch an eine Reinigungsleitung 118 angeschlossen. Details des Filters 11 und seiner Anschlüsse werden im Folgenden näher beschrieben.The washing machine further includes a ball bed filter 11, which in the example shown is part of the supply line to the measuring device 9. The ball bed filter 11 is connected via a supply line 111 to the circulation circuit of the washing machine, ie, in operation, a portion of the circulating wash liquor is coupled out and passed to the filter 11. On the filter itself, the decoupled part of the wash liquor is separated into two partial streams. The larger partial flow (90-95%) is returned via an overflow on the filter 11 directly into the tub 1. A smaller partial flow of the decoupled wash liquor flows through the filter 11 and is transported via the line 117 to the measuring device 9 and from there back into the tub 1. In addition, the filter 11 still connected to a cleaning line 118. Details of the filter 11 and its connections are described in more detail below.

Fig. 2 - 4 zeigen eine Ausführung des Kugelbettfilters 11. Als Kugelbettfilter im Sinne der vorliegenden Erfindung den Filter zu verstehen, bei dem die zu filternde Flüssigkeit durch eine Vielzahl von partikulären Elementen fliesst. Die Elemente befinden sich in einem Käfig, welcher verhindert, dass sie mit der Strömung wandern. Im Normalbetrieb werden die Elemente durch die Strömung gegen die Ausgangsseite des Käfigs gepresst und bilden ein Filterbett, welches die zu filternde Flüssigkeit passiert, um an der Ausgangsseite des Filters auszutreten. Die Eigenschaften des Kugelbettfilters lassen sich unter anderem durch die Zahl bzw. die Dichte, die Grösse und die Beschaffenheit der partikulären Elemente bestimmen. In dem beschriebenen Beispiel sind die partikulären Elemente so ausgelegt, dass der Kugelbettfilter 11 Feststoffanteile im Prozesswasser bis zu einer Grösse von etwa 0.2 Millimeter zurückhält. Dies kann beispielsweise durch Wahl von Glaskugeln, Keramikkugeln oder Metallkugeln mit Kugeldurchmessern im Bereich zwischen 0.5mm bis 2 mm und einer Schütthöhe im Kugelfilter zwischen 10 mm und 30mm erreicht werden. Zur Vereinfachung der folgenden Beschreibung werden die partikulären Elemente des Kugelbettfilters 11 im Weiteren auch als Kugeln bezeichnet. Es sollte jedoch verstanden werden, dass diese Elemente nicht notwendigerweise eine kugelförmige Gestalt haben müssen. Fig. 2-4 show an embodiment of the ball bed filter 11. As a ball bed filter according to the present invention to understand the filter in which the liquid to be filtered flows through a plurality of particulate elements. The elements are housed in a cage that prevents them from traveling with the flow. In normal operation, the elements are forced by the flow against the exit side of the cage and form a filter bed which passes the liquid to be filtered to exit at the exit side of the filter. The properties of the ball bed filter can be determined, among other things, by the number or density, the size and the nature of the particulate elements. In the example described, the particulate elements are designed so that the ball bed filter 11 retains solids in the process water up to a size of about 0.2 millimeters. This can be achieved for example by choosing glass beads, ceramic balls or metal balls with ball diameters in the range between 0.5mm to 2 mm and a dumping height in the ball filter between 10 mm and 30mm. To simplify the following description, the particulate elements of the ball bed filter 11 will be referred to hereinafter as spheres. It should be understood, however, that these elements do not necessarily have to have a spherical shape.

Wie in der perspektivischen Ansicht des Filters 11 von FIG. 2A, dem perspektivischen Schnitt von FIG. 2B durch den Filter 11, dem Querschnitt von FIG. 2C sowie in den Details des Einlassbereichs oder Kopf des Filters 11 von FIG. 3A und 3B gezeigt, weist der Filter 11 im Einlassbereich ein Zufuhrrohr 111 auf. Das Zufuhrrohr 111 steht zum einen mit einer Hauptkammer 112 des Filters 11 in Verbindung, wobei zwischen dem Zufuhrrohr 111 und der Hauptkammer 112 ein Vorfilter 113 angebracht ist. Zum anderen mündet das Zufuhrrohr 111 ebenfalls im Einlassbereich des Filters 11 in ein Überlaufrohr 114.As in the perspective view of the filter 11 of FIG. 2A , the perspective section of FIG. 2 B through the filter 11, the cross section of FIG. 2C as well as in the details of the inlet area or head of the filter 11 of FIG FIG. 3A and 3B 2, the filter 11 has a feed tube 111 in the inlet region. The supply pipe 111 communicates with a main chamber 112 of the filter 11, wherein between the supply pipe 111 and the main chamber 112, a pre-filter 113 is attached. On the other hand, the supply pipe 111 also opens in the inlet region of the filter 11 into an overflow pipe 114.

Der Einlassbereich des Filters 11 mit dem Zufuhrrohr 111, der Öffnung zu der Hauptkammer 112, dem Vorfilter 113, und dem Überlaufrohr 114 ist so ausgelegt und dimensioniert, dass der Hauptteil der durch das Zufuhrrohr 111 eintretenden Flüssigkeit direkt durch das Überlaufrohr 114 den Filter 11 wieder verlässt. Diese Strömung fließt auf einer Seite des Vorfilters 113 entlang und kann so eine reinigende Wirkung auf den Vorfilter ausüben. Die Öffnungen des Vorfilters 113 sind dabei so dimensioniert, dass die partikulären Elemente des Kugelbettfilters 11 nicht durch den Einlassbereich aus der Hauptkammer 112 geschwemmt werden können. In dem vorliegenden Beispiel sind die Gitterabstände der Gitterstäbe des Vorfilters so gewählt, dass die kugelförmigen Elemente mit einem aus dem Bereich vom 5mm bis 20mm nicht passieren können und der Hauptkammer 112 gehalten werden.The inlet portion of the filter 11 with the feed tube 111, the opening to the main chamber 112, the pre-filter 113, and the overflow tube 114 is designed and dimensioned such that the majority of the liquid entering through the feed tube 111 directly through the overflow tube 114 the filter 11 again leaves. This flow flows along one side of the pre-filter 113 and can thus exert a cleaning effect on the pre-filter. The openings of the prefilter 113 are dimensioned such that the particulate elements of the ball bed filter 11 can not be washed out of the main chamber 112 through the inlet area. In the present example, the lattice spacings of the prefilter bars are selected so that the spherical elements can not pass with one in the range of 5 mm to 20 mm and are held in the main chamber 112.

Die Detailzeichnungen in FIG. 3A und 3B zeigen den Einlassbereich des Filters 11 in einem Querschnitt senkrecht zur Strömungsrichtung durch das Zufuhrrohr 111(FIG. 3A) bzw. im Querschnitt parallel zur Strömungsrichtung (FIG. 3B). Der Vorfilter 113 besteht aus sechs, im Wesentlichen parallel zur Hauptströmungsrichtung angeordneten Gitterstäben, welche den nach unten gerichteten Eingang zur Hauptkammer 112 des Kugelbettfilters 11 blockieren.The detailed drawings in FIG. 3A and 3B show the inlet area of the filter 11 in a cross section perpendicular to the flow direction through the feed tube 111 (FIGS. FIG. 3A ) or in cross-section parallel to the flow direction ( FIG. 3B ). The prefilter 113 is composed of six bars arranged substantially parallel to the main flow direction, which block the downwardly directed entrance to the main chamber 112 of the ball bed filter 11.

In der Hauptkammer 112 des Kugelbettfilters 11 befinden sich die partikulären Elemente, die das Kugelbett bilden. Der Filter 11 ist so orientiert, dass sich die Kugeln unter dem Einfluss der Schwerkraft auf einer Lochplatte 115 ablagern. Die Öffnungen in der Lochplatte 115 sind so dimensioniert, dass die partikulären Elemente in der Hauptkammer 112 zurückgehalten werden. In anderen Worten bilden in diesem Beispiel der Vorfilter 113 und die Lochplatte 115 einen Käfig, welcher die Kugeln des Kugelbettfilters 11 in der Hauptkammer 112 hält.In the main chamber 112 of the ball bed filter 11 are the particulate elements which form the ball bed. The filter 11 is oriented so that the balls are deposited on a perforated plate 115 under the influence of gravity. The openings in the perforated plate 115 are dimensioned such that the particulate elements are retained in the main chamber 112. In other words, in this example, the pre-filter forms 113 and the perforated plate 115 has a cage which holds the balls of the ball bed filter 11 in the main chamber 112.

Gefilterte Flüssigkeit strömt im Betrieb durch die Lochplatte 115 in eine Austrittskammer 116 des Filters 11. Die Austrittskammer 116 weist einen Ablauf 117 auf. Der Ablauf 117 ist so angebracht, dass die gefilterte Flüssigkeit nur dann ablaufen kann, wenn ihr Niveau bzw. Pegel das des Kugelbetts oder zumindest der Lochplatte 115 übersteigt. Das Niveau des Kugelbetts ist als die Höhe bzw. Dicke der Schicht definiert, die die Kugeln einnehmen, wenn sie sich vollständig auf dem Lochblech 115 abgesetzt haben.During operation, filtered liquid flows through the perforated plate 115 into an outlet chamber 116 of the filter 11. The outlet chamber 116 has a drain 117. The drain 117 is mounted so that the filtered liquid can drain only when its level exceeds that of the ball bed or at least the perforated plate 115. The level of the ball bed is defined as the height or thickness of the layer which the balls assume when they have settled completely on the perforated plate 115.

Durch diese syphonähnliche Ausgestaltung der Austrittskammer 116 und des Ablaufs 117 ist der Kugelbettfilter 11 so gestaltet, dass sich die partikulären Elemente unterhalb des Flüssigkeitsniveaus in der Hauptkammer 112 des Filters 11 befinden, auch wenn keine Flüssigkeit durch den Filter strömt.By virtue of this siphon-like configuration of the exit chamber 116 and the outlet 117, the ball bed filter 11 is designed such that the particulate elements are below the liquid level in the main chamber 112 of the filter 11, even if no liquid flows through the filter.

Über den Ablauf 117 strömt die gefilterte Flüssigkeit zur Messvorrichtung 9 (s. FIG. 1). Dort kann beispielsweise die Oberflächenspannung der Flüssigkeit bestimmt werden, bevor sie über die Rückflussleitung 12 wieder dem Bottich 1 zugeführt wird. Das Überlaufrohr 114 im Einlassbereich des Filters 11 ist ebenfalls an die Rückflussleitung 12 angeschlossen, so dass Prozesswasser, welches durch das Zufuhrrohr 111, aber nicht durch den Filter 11, fliesst, ebenfalls wieder dem Bottich 1 zugeführt wird.Via the outlet 117, the filtered liquid flows to the measuring device 9 (see FIG. FIG. 1 ). There, for example, the surface tension of the liquid can be determined before it is returned to the tub 1 via the return line 12. The overflow pipe 114 in the inlet region of the filter 11 is also connected to the return line 12, so that process water, which flows through the supply pipe 111, but not through the filter 11, is also returned to the tub 1.

Der Kugelbettfilter 11 ist mit einem Reinigungssystem oder Regenerationssystem versehen. Das Regenerationssystem weist im Wesentlichen ein Steigrohr 118 auf, durch das reinigende Flüssigkeit von unten in den Bodenbereich der Austrittskammer 116 eintreten kann. In dem gezeigten Beispiel (s.a. FIG. 1) ist die reinigende Flüssigkeit Leitungswasser, welches von der Leitung 3 über einen Luftspalt 31 in die Röhre 118 strömen kann. Durch den Luftspalt ist das Regenerationssystem vom Wasserdruck in der Leitung 3 isoliert. Der zum Reinigen des Filters 11 notwendige Druck wird durch die Höhe der Wassersäule bzw. durch den hydrostatischen Druck in dem Steigrohr 118 bestimmt. Das beschriebene Reinigungssystem weist keine Pumpe oder einen anderen internen elektrischen Antrieb zum Aufbau eines zum Spülen des Kugelbetts benötigten Wasserdrucks auf und basiert ausschließlich auf die Wirkung der Schwerkraft als antreibende Kraft. In dem Beispiel können über das Ventil 30 in der Leitung 3 unterschiedliche Drücke eingestellt werden. Bei einem hohen Druck fliesst das Wasser zumindest zum grössten Teil durch den Mischbehälter 4 und über die Leitung 5 in den Bottich 1. Bei einem niedrigen Druck, der durch das Ventil 30 eingestellt wird, fliesst das Wasser bevorzugt in den Trichter 31 und damit in das Rückspülsystem. Mit dieser Lösung kann mit wenigen zusätzlichen beweglichen Elementen das Filtersystem mit einer Selbstreinigung ausgestattet werden.The ball bed filter 11 is provided with a cleaning system or regeneration system. The regeneration system essentially has a riser 118 through which cleaning liquid can enter from below into the bottom region of the outlet chamber 116. In the example shown (see also FIG FIG. 1 ) is the cleaning liquid tap water, which can flow from the conduit 3 via an air gap 31 in the tube 118. Through the air gap, the regeneration system is isolated from the water pressure in the line 3. The pressure required to clean the filter 11 is determined by the height of the water column or by the hydrostatic pressure in the riser 118. The described cleaning system has no pump or other internal electric drive to build up a water pressure needed to flush the ball bed and is based solely on the action of gravity as a driving force. In the example, different pressures can be set via the valve 30 in the line 3. At a high pressure, the water flows at least for the most part through the mixing container 4 and via the line 5 in the tub 1. At a low pressure, which is adjusted by the valve 30, the water flows preferably in the hopper 31 and thus in the backwash. This solution can be equipped with a few additional moving elements, the filter system with a self-cleaning.

Zu Beginn eines Spülvorgangs übersteigt die Höhe der Wassersäule in der Röhre 118 die Höhe, in welcher das Überlaufrohr 114 im Einlassbereich des Filters 11 angebracht ist. Beim Spülen wird der gesamte Filter 11 rasch bis auf die Höhe des Überlaufrohrs 114 gefüllt. Durch die Wirkung der nach oben drückenden bzw. steigenden Spülflüssigkeit werden die Kugeln in der Hauptkammer 112 auseinandergewirbelt und Rückstände, welche sich zwischen den Kugeln im normalen Filterbetrieb festgesetzt haben, werden vom Strom der Spülflüssigkeit nach oben getragen und über das Überlaufrohr 114 aus dem Filter geschwemmt. Durch den gleichen Vorgang wird auch der Vorfilter 113 von Rückständen befreit.At the beginning of a flushing operation, the height of the water column in the tube 118 exceeds the height at which the overflow tube 114 is mounted in the inlet region of the filter 11. When purging the entire filter 11 is quickly filled up to the height of the overflow pipe 114. By the action of the flushing or rising rinsing liquid, the balls in the main chamber 112 are swirled apart and residues which have settled between the balls in the normal filter operation are carried by the flow of the rinsing liquid upwards and washed over the overflow pipe 114 from the filter , By the same process and the pre-filter 113 is freed from residues.

Um die Wirkung der Spülflüssigkeit während dieses Rückspülvorgangs möglichst effektiv zu gestalten, weist das Reinigungssystem noch ein strömungsformendes Element auf, welches geeignet ist, die Wirkung der Spülflüssigkeit über den gesamten Querschnitt der Hauptkammer des Filters zu homogenisieren. Um die Zahl der Komponenten des Systems möglichst klein zu halten, ist das Lochblech 115, welches die Hauptkammer 112 des Filters 11 nach unten abschließt, als ein solches strömungsformendes Element ausgeführt. Wie in der Detailzeichnung von FIG. 4A und 4B gezeigt, weist das Lochblech 115 dazu in einer umfänglich verlaufenden Randzone ein größeres Verhältnis bzw. Dichte an Öffnungen auf als in seiner Zentralzone. Durch diese Ausgestaltung des Lochblechs 115 strömt wird die Strömungsgeschwindigkeit der Spülflüssigkeit an der Randzone des Lochblechs im Vergleich mit einem Lochblech mit einer homogenen Dichte an Öffnungen erhöht.In order to make the effect of the rinsing liquid during this backwashing process as effective as possible, the cleaning system still has a flow-forming element which is suitable, the effect of To homogenize rinse liquid over the entire cross section of the main chamber of the filter. In order to keep the number of components of the system as small as possible, the perforated plate 115, which closes the main chamber 112 of the filter 11 downwards, designed as such a flow-forming element. As in the detailed drawing of FIG. 4A and 4B shown, the perforated plate 115 thereto in a circumferentially extending edge zone, a greater ratio or density of openings than in its central zone. By virtue of this configuration of the perforated plate 115, the flow velocity of the rinsing liquid at the edge zone of the perforated plate is increased in comparison with a perforated plate having a homogeneous density of openings.

Diese gewünschte strömungsformende Wirkung des Lochblechs 115 kann auf verschiedene Weise erzielt werden. So kann das Lochblech am Rande eine größere Dichte an Öffnungen derselben Größe aufweisen als im Zentrum wie in dem Beispiel von FIG. 4A oder die Öffnungen am Rande können eine größere Querschnittsfläche aufweisen als Öffnungen im Zentrum wie in dem Beispiel von FIG. 4B.This desired flow-shaping effect of the perforated plate 115 can be achieved in various ways. Thus, the perforated plate can have a greater density of openings of the same size at the edge than in the center, as in the example of FIG FIG. 4A or the openings at the edge may have a larger cross-sectional area than openings in the center as in the example of FIG. 4B ,

Wenn erwähnt wird, dass das Haushaltsgerät zu einem bestimmten Zweck ausgestaltet ist, so ist dies so zu verstehen, dass die mechanischen und elektrischen Komponenten zu diesem Zweck geeignet sind und die Steuerung so ausgestaltet ist, dass sie die mechanischen und elektrischen Komponenten derart steuert, dass dieser Zweck erreicht wird.If it is mentioned that the household appliance is designed for a specific purpose, it is to be understood that the mechanical and electrical components are suitable for this purpose and the controller is designed to control the mechanical and electrical components in such a way that this purpose is achieved.

Während in der vorliegenden Anmeldung bevorzugte Ausführungen der Erfindung beschrieben sind, ist klar darauf hinzuweisen, dass die Erfindung nicht auf diese beschränkt ist und in auch anderer Weise innerhalb des Umfangs der folgenden Ansprüche ausgeführt werden kann.While preferred embodiments of the invention are described in the present application, it should be clearly understood that the invention is not limited to these and may be practiced otherwise within the scope of the following claims.

Claims (14)

  1. Water-using household device, in particular a washing machine and/or a dishwasher, with a vat (1) for storing an object to be cleaned, a piping sys-tem (8, 12) for process liquid connected with the vat, characterized in that a ball bed filter (11) or a granulate filter connected with the piping system (8, 12) is provided for cleaning the process liquid of solids,
    wherein the ball bed filter (11) or the granulate filter have a regeneration system (118) for flushing the ball bed filter (11) or the granulate filter with flushing liquid in the direction opposite to the normal flow direction of the process liquid.
  2. Household device according to claim 1,
    wherein the piping system (8, 12) has a circuit for circulating the process liquid from and into the vat (1) and the ball bed filter (11) or the granulate filter is part of the circuit.
  3. Household device according to one of the preceding claims, wherein the outlet (117) of the ball bed filter (11) or the granulate filter is connected with the inlet of a measurement device (9) for measuring a parameter of the process liquid, in particular of the surface tension, and the measurement device is connected with a control unit (10) of the household device via a signal line.
  4. Household device according to one of the preceding claims, wherein the ball bed filter (11) or the granulate filter has an inlet area with a supply pipe (111) connected to the piping system (8, 12) and with a prefilter (113).
  5. Household device according to claim 4,
    wherein openings in the prefilter (113) are dimensioned such that particulate elements of the ball bed filter (11) or the granulate filter cannot pass through and are kept back in the ball bed filter (11) or granulate filter.
  6. Household device according to one of the claims 4 or 5, wherein the inlet area has an overflow pipe (112) connected to the piping system (8, 12) and a connection between the supply pipe (111) and the overflow pipe (112) conducts process liquid during operation along at least one side of the prefilter (113).
  7. Household device according to claim 6,
    wherein the prefilter (113) has a lattice with lattice rods oriented parallel to the flow direction between the supply pipe (11) and the overflow pipe (112).
  8. Household device according to one of the preceding claims, wherein the regeneration system (118) is powered by gravitation or by a hydrostatic head of the flushing liquid.
  9. Household device according to one of the preceding claims, wherein the regeneration system (118) is exclusively powered by gravitation or a hydrostatic head of the flushing liquid.
  10. Household device according to one of the preceding claims, wherein the regeneration system (118) has a flow forming element (115) near the in-let into the ball bed filter (11) or the granulate filter which is adapted to effect a preferably peripheral flow or a side flow through the ball bed filter (11) or granulate filter during flushing.
  11. Household device according to claim 10,
    wherein openings of the flow forming element (115) are dimensioned such that particulate elements cannot pass the ball bed filter (11) or granulate filter and are kept back in the ball bed filter (11) or the granulate filter.
  12. Household device according to one of the claims 10 to 11, wherein the flow forming element is a perforated plate (115), which closes the ball bed filter (11) or granulate filter towards the outlet.
  13. Household device according to one of the preceding claims, wherein the ball bed filter (11) or granulate filter has a main chamber (112) with particulate elements and an outlet chamber (116) with an outlet (117) for the filtered process liquid, wherein the main chamber (112) extends into the outlet chamber (116) and the outlet (117) is arranged above a lower end of the main chamber (112), such that the outlet chamber (116) forms a siphon during operation, which keeps at least a part of the particulate elements in the main chamber (112) in a liquid bath.
  14. Household device according to claim 13,
    wherein the lower end (115) of the main chamber is flat or concave rounded in flow direction of the process liquid.
EP14003297.0A 2014-09-24 2014-09-24 Water-conducting domestic appliance with lye filter Active EP2816150B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DK14003297.0T DK2816150T3 (en) 2014-09-24 2014-09-24 Aquatic household appliance with lye filter
SI201430737T SI2816150T1 (en) 2014-09-24 2014-09-24 Water-conducting domestic appliance with lye filter
EP14003297.0A EP2816150B1 (en) 2014-09-24 2014-09-24 Water-conducting domestic appliance with lye filter
PL14003297T PL2816150T3 (en) 2014-09-24 2014-09-24 Water-conducting domestic appliance with lye filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14003297.0A EP2816150B1 (en) 2014-09-24 2014-09-24 Water-conducting domestic appliance with lye filter

Publications (3)

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EP2816150A2 EP2816150A2 (en) 2014-12-24
EP2816150A3 EP2816150A3 (en) 2015-04-15
EP2816150B1 true EP2816150B1 (en) 2018-03-14

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Application Number Title Priority Date Filing Date
EP14003297.0A Active EP2816150B1 (en) 2014-09-24 2014-09-24 Water-conducting domestic appliance with lye filter

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EP (1) EP2816150B1 (en)
DK (1) DK2816150T3 (en)
PL (1) PL2816150T3 (en)
SI (1) SI2816150T1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019201845A1 (en) * 2019-02-13 2020-08-13 BSH Hausgeräte GmbH Household appliance for treating laundry
DE102019203576A1 (en) * 2019-03-15 2020-09-17 BSH Hausgeräte GmbH Laundry care device with a filter element
FR3108921B1 (en) * 2020-04-03 2022-03-04 Ifp Energies Now REGENERABLE SYSTEM AND METHOD FOR FILTRATION OF MICROFIBERS FROM A DRAIN FLUID

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166156B (en) * 1954-08-18 1964-03-26 Nat Engineering Company Of Can Wet separator for dusty air or gases
US5800628A (en) * 1996-10-22 1998-09-01 Honeywell Inc. Continuous cycle operation for dishwashers using turbidity sensor feedback
DE102010000763A1 (en) * 2010-01-11 2011-07-14 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Water-bearing household appliance i.e. laundry treatment device, for washing and/or drying laundry, has water supply line for guiding water into housing, and rust particle filter arranged in supply line for filtering rust particles in water
SI2319382T1 (en) 2010-10-14 2014-09-30 V-Zug Ag Dishwasher or washing machine with a measuring device for measuring the surface tension of lye
EP2559802B1 (en) * 2011-08-18 2013-10-16 Miele & Cie. KG Lye pump with filter insert for a washing machine
EP2422678B1 (en) 2011-10-05 2018-11-28 V-Zug AG Water-conveying domestic appliance with cleanable surface tension measuring device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
PL2816150T3 (en) 2018-10-31
EP2816150A2 (en) 2014-12-24
SI2816150T1 (en) 2018-06-29
DK2816150T3 (en) 2018-05-22
EP2816150A3 (en) 2015-04-15

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