EP1579053B1 - Drier comprising at least two electrodes for measuring the conductance of laundry, and method for preventing the formation of layers on electrodes - Google Patents

Drier comprising at least two electrodes for measuring the conductance of laundry, and method for preventing the formation of layers on electrodes Download PDF

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Publication number
EP1579053B1
EP1579053B1 EP03785811.5A EP03785811A EP1579053B1 EP 1579053 B1 EP1579053 B1 EP 1579053B1 EP 03785811 A EP03785811 A EP 03785811A EP 1579053 B1 EP1579053 B1 EP 1579053B1
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EP
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Prior art keywords
electrodes
tumble dryer
air
means
characterised
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EP03785811.5A
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German (de)
French (fr)
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EP1579053A1 (en
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Lothar Dittmer
Harald MOSCHÜTZ
Thomas Nawrot
Andreas Ziemann
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Priority to DE2002160149 priority Critical patent/DE10260149A1/en
Priority to DE10260149 priority
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Priority to PCT/EP2003/014177 priority patent/WO2004059072A1/en
Publication of EP1579053A1 publication Critical patent/EP1579053A1/en
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    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00Domestic laundry driers
    • D06F58/20General details of domestic laundry driers
    • D06F58/28Controlling or regulating
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00Domestic laundry driers
    • D06F58/20General details of domestic laundry driers
    • D06F58/28Controlling or regulating
    • D06F2058/2816Automatic detection of the humidity or dryness of the laundry directly or indirectly by measuring
    • D06F2058/2838Automatic detection of the humidity or dryness of the laundry directly or indirectly by measuring the laundry electrical resistance

Description

  • Die Erfindung betrifft einen Wäschetrockner, der zumindest einen Aufnahmebereich für Wäsche und zumindest zwei Elektroden zur Messung des Leitwertes der Wäsche umfasst, wobei zumindest eine der Elektroden zumindest teilweise an diesen Aufnahmebereich angrenzt, sowie ein Verfahren zur Verhinderung von Schichtbildung auf Elektroden zur Leitwertmessung in einem solchen Wäschetrockner. The invention relates to a clothes dryer, comprising at least one receiving area for laundry and at least two electrodes for measuring the conductivity of the laundry, wherein at least one of the electrodes at least partially adjacent to said receiving area, and a method for preventing film formation on electrodes for conductance in such a dryer.
  • Aus dem From the US Patent 3,411,219 US Patent 3,411,219 , dem , the US Patent 3,394,466 US Patent 3,394,466 , der , the WO 1997/032071 A1 WO 1997/032071 A1 und dem and the US Patent 3,300,869 US Patent 3,300,869 geht jeweils ein Wäschetrockner der eingangs definierten Gattung hervor. will each produce a tumble dryer of the genus defined at the outset.
  • In modernen Wäschetrocknern, insbesondere in Haushaltswäschetrocknern, wird für die Steuerung des Wäschetrockners, insbesondere zur Erzielung einer gewünschten Restfeuchte in der Wäsche die Wäschefeuchte in der Wäsche gemessen. In modern tumble dryers, in particular in household tumble driers, the laundry humidity is measured in the wash for the control of the laundry dryer, in particular to achieve a desired residual moisture in the laundry. Bevorzugt wird diese Messung nach dem Prinzip der Leitwertmessung durchgeführt. This measurement is preferably carried out according to the principle of the conductance measurement.
  • In der Regel werden hierzu zwei Elektroden an die Wäsche angelegt, wobei eine der Elektroden beispielsweise die Wäschetrommel darstellen kann und die zweite, Elektrode ein gegen die Trommel isoliert eingebauter Mitnehmer sein kann. In general, for this purpose, two electrodes are applied to the laundry, wherein one of the electrodes may represent, for example, the washing drum, and the second electrode may be an isolated against the drum built-in driver. An die zwei Elektroden wird über einen Widerstand eine Spannung angelegt, die einen Stromfluss durch die Wäsche zur Folge hat. To the two electrodes, a voltage is applied through a resistor having a current flow through the wash result. Die dabei an der Wäsche abfallende Wäschespannung wird an den Elektroden gemessen und daraus der Leitwert bestimmt, der proportional zu dem Feuchtigkeitsgehalt in der Wäsche ist. The thereby falling to the laundry wash voltage is measured at the electrodes and determines therefrom the conductance, which is proportional to the moisture content in the laundry.
  • Es wurde insbesondere bei fest stehenden Elektroden festgestellt, dass sich eine Drift der Messergebnisse nach mehrmaligem Gebrauch eingestellt hat. It has been found in particular in fixed electrodes that a drift of the measurement results is set after repeated use. Untersuchungen haben ergeben, dass dies durch Bildung von Ablagerungen in Form von Schichten auf den Elektroden durch Wasserinhaltsstoffe und Waschmittelsubstanzen verursacht wird. Studies have shown that this is caused by formation of deposits in the form of layers on the electrodes by substances in the water and detergent substances. Durch diese Schichten, die beispielsweise Kalk und Silikate umfassen können, wird bei der Messung der Wäschefeuchte der durch die Schichten zusätzlich auftretende Übergangswiderstand mit gemessen und das Ergebnis der Wäschefeuchtemessung damit verfälscht. Through these layers which may comprise, for example lime and silicates, the additionally occurring through the layers contact resistance with measured and the result of the laundry humidity measurement is distorted so that in the measurement of laundry humidity. Daher kann beispielsweise eine gezielte Einstellung einer Restfeuchte in der Wäsche nicht mehr gewährleistet werden. Therefore, a specific adjustment of residual moisture in the laundry for example, can no longer be guaranteed. Die Endrestfeuchtigkeit der Wäsche wird nach Abschluss des Trockenprogramms vielmehr in Richtung feuchterer Wäsche verschoben. The Endrestfeuchtigkeit the laundry is moved to the end of the drying cycle rather towards wetter laundry. Zur Entfernung der Schichten wurde vorgeschlagen die Elektrodenoberflächen mit säurehaltigen Reinigungsmitteln zu reinigen, um die Funktionsfähigkeit der Wäschefeuchtemessung wieder herzustellen. To remove the layers of the electrode surfaces was proposed to be cleaned with acidic cleaners to restore the functioning of the laundry moisture measurement. Dies ist zum einen aufwendig und zum anderen können die Elektroden, je nach dem gewählten Einbauort für den Benutzer schwer zugänglich sein. This is costly and, on the other, the electrodes, depending on the selected location for the user to be difficult to access.
  • Aufgabe der Erfindung ist es daher, einen Wäschetrockner und ein Verfahren zur Verhinderung der Schichtbildung auf Elektroden in einem Wäschetrockner zu schaffen, mittels derer die Bildung von Schichten auf Elektroden verhindert oder zumindest so stark reduziert werden kann, dass auch nach mehrmaligem Gebrauch eine präzise Ermittlung der Wäschefeuchte ermöglicht wird, ohne dass die Elektroden von dem Benutzer gereinigt werden müssen. The object of the invention is therefore to provide a clothes dryer and a method for preventing film formation on the electrode in a laundry dryer, by means of which can be the formation of layers prevented electrodes or at least reduced so much that even after repeated use a precise determination of the laundry moisture is made possible without the electrodes need to be cleaned by the user. Zudem soll der Wäschetrockner einen einfachen Aufbau aufweisen. In addition, the dryer should have a simple structure.
  • Der Erfindung liegt die Erkenntnis zugrunde, dass durch gezielte Einstellung einer gewissen Temperatur an den Elektrodenoberflächen die Bildung von Schichten verhindert oder zumindest verringert werden kann. The invention is based on the finding that can be prevented by targeted setting a certain temperature at the electrode surfaces, the formation of layers or at least reduced.
  • Die Aufgabe wird daher erfindungsgemäß gelöst durch einen Wäschetrockner gemäß den Merkmalen des Anspruchs 1. In Wäschetrocknern ist ein Aufnahmeraum für die zu trocknende Wäsche vorgesehen, der in der Regel eine Wäschetrommel darstellt. The object is therefore achieved according to the invention by a laundry dryer according to the features of claim 1. In tumble driers a receiving space for the laundry to be dried is provided, which is generally a washing drum. Durch das Vorsehen von Mitteln zur Wärmeabfuhr aus mindestens einem Teil der Elektroden, kann zumindest die Oberfläche mindestens einer der Elektroden, die dem Aufnahmeraum zugewandt ist bzw. an diesen angrenzt, gekühlt werden. By providing means for removal of heat from at least a portion of the electrodes, at least the surface of at least one of the electrodes, which faces the receiving space and is adjacent thereto, are cooled. Durch dieses Absenken der Temperatur der Elektroden kann das Verdunsten von Wasser an den Elektroden, durch das es zur Bildung von Ablagerungen von Wasserinhaltsstoffen und Waschmittelrückständen kommen kann, vermieden werden. Through this lowering of the temperature of the electrodes, the evaporation of water at the electrodes through which can occur to the formation of deposits of water constituents and detergent residues can be avoided. Eine Bildung von Formation of
    Schichten, die die Messergebnisse der Leitwertmessung verfälschen, kann somit verhindert werden. Layers which distort the measurement results of the conductivity measurement can thus be prevented. Zudem kann die Kondensation von feuchtwarmer Luft im Trommelinneren an den Elektroden dazu führen, dass die Lösung aus Wasser- und Waschmittelinhaltsstoffen an den Elektroden verdünnt wird und dadurch ein Ausfallen der gelösten Mineralien verhindert wird. In addition, the condensation of moist warm air inside the drum at the electrodes may lead to the solution of water and detergent ingredients is diluted to the electrodes and thereby precipitation of the dissolved minerals is prevented.
  • Indem die Mittel zur Wärmeabfuhr vorzugsweise auf der Rückseite der Elektroden vorgesehen sind ist eine besonders einfache und vorteilhafte Wärmeabfuhr gewährleistet. By the means for heat dissipation are preferably provided on the back of the electrode in a particularly simple and advantageous heat dissipation is ensured.
    In einer Ausführungsform stellen die Mittel zum Kühlen der Elektroden, Mittel zur Verbesserung der Abstrahlung von Wärme von den Elektroden dar. Diese Ausführungsform bietet sich in Fällen an, in denen die Elektroden in Positionen eingebaut sind, an denen die Seite der Elektroden, die dem Trommelinneren abgewandt ist, an einen Raum grenzt, in dem eine geringere Temperatur als in der Wäschetrommel herrscht. In one embodiment, the means provide for cooling of the electrodes, means for improving the radiation of heat from the electrodes. This embodiment lends itself in cases in which the electrodes are mounted in positions at which the side of the electrode which the drum interior facing away borders on a space in which a lower temperature than in the laundry drum prevails. So kann beispielsweise die Rückseite der Elektroden, das heißt die Seite der Elektroden, die dem Inneren der Wäschetrommel abgewandt ist, mit einer schwarzen Beschichtung versehen werden, durch die die Abstrahlung der Wärme in diese Richtung verbessert wird. For example, the back of the electrode, that is, the side of the electrode which faces away from the interior of the laundry drum are provided with a black coating, through which the radiation of heat is improved in that direction. Es ist auch möglich die Wärmeabstrahlung durch Aufrauen der Rückseite der Elektroden zu verbessern. It is also possible to improve by roughening the back of the electrode heat radiation.
    Alternativ oder zusätzlich können die Mittel Kühlflächen darstellen, die mit den Elektroden verbunden sind. Alternatively or additionally the means may represent cooling surfaces, which are connected to the electrodes. Über diese Kühlflächen kann es entweder durch Wärmeabstrahlung oder durch zusätzliches Kühlen der Kühlflächen durch ein geeignetes Kühlmedium, wie beispielsweise Luft, zu einer Erniedrigung der Temperatur der Elektroden, insbesondere der dem Trommelinneren zugewandten Oberfläche der Elektroden kommen. This cooling surfaces can occur either by radiation or by additional cooling of the cooling surfaces by a suitable cooling medium, such as air, to a lowering of the temperature of the electrodes, in particular the side facing the drum interior surface of the electrodes.
  • Erfindungsgemäß umfassen die Mittel zum Kühlen der Elektroden, Mittel zur Luftführung. According to the invention, the means for cooling the electrodes, means for guiding air. Durch Führung kälterer Luft aus anderen Teilen des Wäschetrockners entlang der oder auf die Elektroden, insbesondere entlang der oder auf die Elektrodenoberfläche, die der Trommel zugewandt ist, kann die Temperatur der Elektroden gesenkt werden. Implementing colder air from other parts of the clothes dryer along or on the electrodes, in particular along or on the electrode surface, which faces the drum, the temperature of the electrodes can be lowered.
  • Gemäß einer bevorzugten Ausführungsform werden die Mittel zur Luftführung durch definierte Fehlluftöffnungen in der Nähe der Elektroden gebildet. According to a preferred embodiment, the means for guiding air through defined unwanted air holes in the vicinity of the electrodes are formed. Über diese Fehlöffnungenkann den Elektroden Umgebungsluft zugeführt werden. Via these false opening Can applied to the electrodes surrounding air. Als Fehlluftöffnungen werden im Sinne dieser Erfindung Durchlässe bezeichnet, über die kältere Luft aus anderen Bereichen des Wäschetrockners bzw. aus dessen Umgebung zu den Elektroden geführt werden kann. As unwanted air openings in the sense of this invention are referred passages, can be guided over the colder air from other areas of the clothes dryer or in the vicinity thereof to the electrodes. Die Fehlluftöffnungen können auch in Form von Leitungen ausgebildet sein. The faulty air openings can also be designed in the form of lines. Bevorzugt stellen die Fehlluftöffnungen aber Spalten dar. Preferably, however, the unwanted air openings represent columns.
  • Die Mittel können auch ein zusätzliches Gebläse zur Erhöhung der Strömungsgeschwindigkeit, oder eine Druckluftquelle umfassen. The means can also comprise an additional fan for increasing the flow rate, or a compressed air source.
  • Besonders bevorzugt sind die Elektroden in dem Wäschetrockner feststehend verbaut. Particularly preferably, the electrodes are installed fixed in the clothes dryer. Durch diese Ausgestaltung kann auf eine aufwendige Kontaktierung der Elektrode, wie dies bei mitlaufenden Elektroden notwendig ist, verzichtet werden. Through this embodiment can be applied to a complex contact with the electrode, as is required when follower electrodes can be omitted. Mit der Erfindung kann aber dennoch eine Schichtbildung auf den Elektroden vermieden werden, obwohl die Beseitigung von Ablagerungen durch Reibung mit der Wäsche, die in der Trommel bewegt wird, wie diese bei Mitnehmerelektroden entsteht, weitestgehend entfällt. With the invention, however, film formation can be avoided on the electrodes yet, although the removal of deposits by friction with the laundry, which is moved into the drum, as this arises in Mitnehmerelektroden, largely eliminated.
  • Die in dem Wäschetrockner verwendeten Mittel zur Wärmeabfuhr können wie in den entsprechenden abhängigen Patentansprüchen beschrieben ausgebildet sein. The means used in the clothes dryer for heat dissipation may be formed as described in the respective dependent claims. Diese können damit Mittel zur Verbesserung der Abstrahlung von Wärme, Kühlflächen, ein Gebläse oder eine Druckluftquelle umfassen. This can therefore include means for improving the radiation of heat, cooling surfaces, a fan or a compressed air source.
  • In einer Ausführungsform sind bei dem erfindungsgemäßen Wäschetrockner, insbesondere beim Trockner nach der Abluftbauart, Mittel vorgesehen, über die in dem Aufnahmebereich des Wäschetrockners ein Unterdruck eingestellt werden kann. In one embodiment, in the inventive clothes dryer, especially in the dryer according to the exhaust air type, means are provided via which a vacuum can be set in the receiving area of ​​the laundry dryer. Zusätzlich stellen die Mittel zum Kühlen in dieser Ausführungsform definierte Fehlluftöffnungen dar, über die die Elektroden mit Umgebungsluft versorgt werden können. In addition, the means provide for cooling in this embodiment defined false air orifices constitute, over which the electrodes can be supplied with ambient air. Durch das Vorsehen von Mitteln zum Erzeugen eines Unterdrucks kann die Luftführung in dem erfindungsgemäßen Wäschetrockner ideal eingestellt werden. Through the provision of means for generating a negative pressure air distribution in the inventive dryer can be ideally adjusted. Kältere Umgebungsluft kann über diesen Unterdruck durch die Fehlluftöffnungen zu den Elektroden und insbesondere zu der Elektrodenoberfläche gelangen. Colder ambient air can pass through this negative pressure by the false air openings to the electrodes and in particular to the electrode surface. Zur Erzeugung des Unterdrucks kann beispielsweise ein Gebläse verwendet werden. To generate the negative pressure, a blower may be used for example. Durch diese Einstellung der Luftströmung in den Wäschetrockner kann die Bildung von Ablagerungen auf den Elektroden auf einfache Weise vermieden werden. This setting of the air flow in the dryer the formation of deposits can be avoided on the electrodes easily.
  • Die Elektroden sind vorzugsweise feststehend in dem Wäschetrockner eingebaut. The electrodes are preferably installed fixed in the clothes dryer. Besonders bevorzugt sind diese im Bereich des vorderen Lagerschildes angeordnet. These are particularly preferably arranged in the region of the front bearing plate. Bei dieser Ausgestaltung kann der erfindungsgemäße Effekt der Verhinderung der Schichtbildung auf den Elektroden besonders vorteilhaft genutzt werden, da an diesem Einbauort andere Mechanismen zur Beseitigung der Schichten, wie beispielsweise die Reibung mit der in der Trommel befindlichen Wäsche nur geringfügig genutzt werden können. In this embodiment, the inventive effect of preventing the film formation can be used particularly advantageously on the electrodes, as for example, the friction can be used only slightly with the laundry in the drum at this Fitting other mechanisms for removal of the layers.
  • Schließlich wird die Aufgabe durch ein Verfahren zur Verhinderung von Schichtbildungen auf Elektroden zur Feuchtemessung in einem erfindungsgemäßen Wäschetrockner, gelöst, wobei die Temperatur der Elektroden über Mittel zur Wärmeabfuhr kontrolliert gesteuert wird. Finally, the object is achieved by a method for preventing film formation on electrodes for measuring moisture in a clothes dryer according to the invention, wherein the temperature of the electrodes is controlled controlled by means of heat dissipation. Vorzugsweise werden hierbei die Elektroden zumindest teilweise gekühlt. Preferably, the electrodes are in this case at least partially cooled.
  • Die Mittel zur Wärmeabfuhr, die erfindungsgemäß zur Steuerung der Wärmeabfuhr verwendet werden können, können wie in den abhängigen Patentansprüchen beschrieben ausgebildet sein. The means for heat dissipation, which can be used according to the invention for controlling the heat dissipation can be formed as described in the dependent claims. Diese können damit Mittel zur Verbesserung der Abstrahlung von Wärme, Kühlflächen, ein Gebläse oder eine Druckluftquelle umfassen. This can therefore include means for improving the radiation of heat, cooling surfaces, a fan or a compressed air source. Erfindungsgemäß werden die Elektroden auf eine Temperatur gebracht, die unterhalb der Prozesstemperatur in dem Wäschetrockner, vorzugsweise unterhalb der Temperatur von Oberflächen, die zu den Elektroden benachbart sind, liegt. According to the invention, the electrodes are brought to a temperature which is below the process temperature in the clothes dryer, preferably below the temperature of surfaces which are adjacent to the electrodes. Die Temperaturdifferenz wird hierbei vorzugsweise mit mindestens einem Grad Kelvin (1°K) eingestellt. The temperature difference is preferably set in this case with at least one degree Kelvin (1 ° K). Benachbarte Oberflächen sind beispielsweise der Stirnboden oder der vordere Trommelmantel der Wäschetrommel. Adjacent surfaces, for example, the end or bottom of the front drum casing of the laundry drum. Während an den relativ kühleren Elektroden eventuell dort durch die Wäsche aufgetragene Lösungen von Wasser- und Waschmittelinhaltsstoffen durch Kondensation der feuchtwarmen Luft verdünnt wird, wird an den relativ wärmeren metallischen Oberflächen in der Umgebung die Lösung durch Verdunsten von Wasser weiter aufkonzentriert, was zur Ablagerung der Mineralien und damit zur Bildung von Schichten auf diesen relativ wärmeren Oberflächen führt. While at the relatively cooler electrodes may there applied by the washing solutions of water and detergent ingredients is diluted by condensation of the humid and warm air, the solution by evaporation of water is further concentrated on the relatively warmer metallic surfaces in the environment, leading to the deposition of minerals and thus results in the formation of layers on these relatively warmer surfaces. Die für die Leitwertmessung benötigten Elektronenoberflächen bleiben aber frei von Ablagerungen. But the electrons surfaces required for the conductance remain free of deposits.
  • Die Kühlung der Elektroden kann auf verschiedene Arten erzielt werden. The cooling of the electrodes can be achieved in several ways. In einer Ausführungsform werden die Elektroden durch Luftkühlung gekühlt. In one embodiment, the electrodes are cooled by air cooling. Diese Art der Kühlung bei der eine gezielte Kühlluftzufuhr auf zumindest einen Teil der Elektroden gelenkt wird, hat den besonderen Vorteil, dass die in dem Trockner außerhalb der Wäschetrommel befindliche Luft als Kühlmittel verwendet werden kann und somit ein Einbringen weiterer Kühlstoffe in den Wäschetrockner nicht notwendig ist. This type of cooling in a targeted supply of cooling air, at least a part of the electrode is drawn to, has the particular advantage that the air in the dryer outside the laundry drum can be used as the coolant and thus introducing further cooling substances in the dryer is not necessary , Aus diesem Grund ist eine insbesondere bei Trocknern nach der Abluftbauart bevorzugte Ausführungsform des Verfahrens dadurch gekennzeichnet, dass in einem Aufnahmebereich für Wäsche in dem Wäschetrockner Unterdruck eingestellt wird und die Elektroden mit Kühlluft versorgt werden, indem über definierte Fehlluftöffnungen Umgebungsluft zu den Elektroden geführt wird. For this reason, a preferred embodiment of the method is characterized in that negative pressure is set in a receiving area for laundry in the laundry dryer and the electrodes are supplied with cooling air by passing over defined false air openings ambient air to the electrodes, in particular for dryers by the exhaust air type.
  • Die Vorteile und Merkmale des erfindungsgemäßen Wäschetrockners gelten entsprechend auch für das erfindungsgemäßen Verfahren und jeweils umgekehrt. The advantages and features of the clothes dryer according to the invention apply mutatis mutandis to the novel process and each vice versa.
  • Die Erfindung wird im Folgenden anhand der beiliegenden Zeichnungen, die ein nicht-beschränkendes Beispiel einer möglichen Ausführungsform der Erfindung darstellen, beschrieben. The invention is described below with reference to the accompanying drawings which illustrate a non-limiting example of a possible embodiment of the invention. Es zeigen: Show it:
    • Figur 1 Figure 1 : eine perspektivische Ansicht einer Ausführungsform einer Vorrichtung zur Messung der Wäschefeuchte in einem erfindungsgemäßen Wäschetrockner; A perspective view of an embodiment of a device for measuring the laundry moisture in a clothes dryer according to the invention;
    • Figur 2 Figure 2 : eine Explosionsansicht der in An exploded view of the in Figur 1 Figure 1 dargestellten Ausführungsform der Vorrichtung; Embodiment of the apparatus shown;
    • Figur 3 Figure 3 : eine schematische Querschnitt-Ansicht durch die in Is a schematic cross-sectional view through the in Figur 1 Figure 1 dargestellte Ausführungsform der Vorrichtung; Embodiment of the apparatus shown;
    • Figur 4 Figure 4 : eine schematische Längsschnitt-Ansicht durch die in A schematic longitudinal cross-sectional view through the in Figur 1 Figure 1 dargestellte Ausführungsform der Vorrichtung. Embodiment of the device shown.
    • Figur 5 bis 7 Figure 5 to 7 : eine gegenüber der in : One against the in Figur 2 bis 4 Figure 2 to 4 abgewandelte Ausführungsform einer Vorrichtung zur Messung der Wäschefeuchte in einem erfindungsgemäßen Wäschetrockner. modified embodiment of a device for measuring the laundry moisture in a clothes dryer according to the invention.
    • Figur 8 Figure 8 : einen erfindungsgemäßen Wäschetrockner nach der Kondensationsbauart mit einer Vorrichtung zur Messung der Wäschefeuchte. : A clothes dryer according to the invention after the condensation type comprising a device for measuring the laundry moisture.
  • In In Figur 1 Figure 1 ist eine Ausführungsform einer Vorrichtung 1 in perspektivischer Ansicht dargestellt. an embodiment of a device 1 is shown in perspective view. Vorrichtungen zur Messung des Leitwertes sind aus dem Stand der Technik hinreichend bekannt, so dass in den Figuren nur Elemente der Vorrichtung dargestellt sind, die für die Erfindung wesentlich sind. Devices for measuring conductivity are well known from the prior art, so that only elements of the apparatus are shown in the figures, which are essential for the invention. Die Vorrichtung 1 umfasst zwei Elektroden 2, die sich jeweils längs erstrecken und parallel zueinander angeordnet sind. The device 1 comprises two electrodes 2, which each extend longitudinally and are arranged parallel to each other. Die Elektroden 2 werden auf einem Bauteil 3 gehalten, wobei zur Befestigung der Elektroden 2 ein Halterahmen 4 vorgesehen ist. The electrodes 2 are supported on a component 3, wherein a holding frame 4 is provided for fixing the electrodes. 2 Dieser kann rastend mit dem Bauteil 3 verbunden sein. This can be lockingly connected to the component. 3 Das Bauteil 3 kann beispielsweise das vordere Lagerschild bzw. einen Teil der Halterung der Trommel darstellen. The member 3 may represent for example, the front bearing plate and a part of the holder of the drum. Wie sich der How does the Figur 2 Figure 2 entnehmen lässt, weist das Bauteil 3 in der dargestellten Ausführungsform eine Vertiefung 31 auf, die der Größe des Halterahmens 4 entspricht und zur Aufnahme des Halterahmens 4 dient. can be inferred, the component 3 in the illustrated embodiment, a recess 31 which corresponds to the size of the holding frame 4 and serves to receive the holding frame. 4 In der Vertiefung 31 sind Öffnungen 32 vorgesehen, die sich durch das Bauteil 3 erstrecken und in der dargestellten Ausführung jeweils mit Rohransätzen 33 versehen sind. In the recess 31 openings 32 are provided which extend through the member 3 and are provided in the illustrated embodiment, each tube approaches with 33rd Die Rohransätze 33 erstrecken sich im Zustand, in dem die Elektroden 2 auf dem Bauteil 3 befestigt sind, in den Innenraum der Elektroden 2. The pipe sockets 33 extend in the state in which the electrodes are mounted on the member 2, 3 in the interior of the electrode. 2
  • Im Unterschied zur in den In contrast to the Figuren 2 bis 4 Figures 2 to 4 dargestellten Ausführung ist in Embodiment shown in Figuren 5 bis 7 5 through 7 das rückwärtig zu den Elektroden 2 angebrachte Bauteil 3 mit einer mittigen Öffnung 32 zur Zufuhr von Kühlluft und mit je zwei seitlichen Öffnungen 32 zur Abfuhr von Kühlluft vorgesehen. the rear attached to the electrodes 2 component 3 with a central aperture 32 for supplying cooling air, and with two lateral openings 32 for the discharge of cooling air is provided. Auf diese Weise tritt der Kühlluftstrom mittig ein und unterteilt sich in zwei Teilluftströme, so dass eine gleichmäßige Kühlung der Elektroden gewährleistet ist. In this way, the cooling air stream passes centrally and is divided into two branch streams of air, so that a uniform cooling of the electrodes is ensured.
  • Die Elektroden 2 weisen jeweils eine Wannenform auf, wobei die Öffnung der Wanne dem Bauteil 3 zugewandt ist. The electrodes 2 each have a trough shape, wherein the opening of the tub facing the component. 3 An dem Rand der Wannenöffnung erstreckt extends to the edge of the trough opening
    sich an jeder Elektrode 2 nach außen ein Flansch 21, der über die Länge der Elektroden 2 an mehreren Positionen (hier drei) durch Ausnehmungen 211 unterbrochen ist. at each electrode 2 to the outside, a flange 21 which is interrupted at several positions (here, three) recesses 211 by the length of the electrode. 2 Die Ausnehmungen 211 erstrecken sich vorzugsweise über den Flansch 21 hinaus in Richtung des Wannenbodens der Elektroden 2. Der Halterahmen 4 weist zwei Längsnuten 41 auf, die der Form der Elektroden 2 entsprechen. The recesses 211 preferably extend beyond the flange 21 also in the direction of the trough bottom of the electrode 2. The support frame 4 comprises two longitudinal grooves 41, which correspond to the shape of the electrodes. 2 Über die Länge der Längsnuten 41 sind an Positionen, die den Positionen der Ausnehmungen 211 an den Elektroden 2 entsprechen, Erweiterungen 411 der Längsnut 41 vorgesehen. Over the length of the longitudinal grooves 41 extensions 411 of the longitudinal groove 41 at positions corresponding to the positions of the recesses 211 on the electrode 2 is provided.
  • Wie sich aus As is clear from Figur 3 Figure 3 ergibt, ragen im eingebauten Zustand die Rohransätze 33, die auf dem Bauteil 3 vorgesehen sind, in die Innenräume Elektroden 2, dh in die Wannenform, hinein, berühren aber den Wannenboden nicht. result, projecting in the installed state, the pipe sockets 33, which are provided on the component 3, in the interiors of the electrodes 2, that in the trough shape into it, but not touching the tank bottom.
  • Figur 4 Figure 4 zeigt einen Längsschnitt, durch die in shows a longitudinal section through the in Figur 1 Figure 1 dargestellte Ausführungsform der Vorrichtung 1. Eine Ausführungsform des erfindungsgemäßen Verfahrens soll anhand dieser Darstellung nunmehr erläutert werden. Embodiment of the device depicted 1. An embodiment of the method according to the invention will be explained with reference to this drawing now.
  • Bei einem Wäschetrockner nach der Abluftbauart, der nach dem Saugprinzip arbeitet, herrscht in der Wäschetrommel bauartbedingt ein gewisser Unterdruck. In a laundry dryer according to the exhaust air type, operating according to the suction principle, there is in the laundry drum type of construction, a certain negative pressure. Wird die Vorrichtung 1 in einem solchen erfindungsgemäßen Wäschetrockner eingesetzt, so kommt es zu folgendem Strömungsverhalten. The device 1 is used in such a clothes dryer according to the invention, so it comes to the following flow behavior. Kältere Luft, die sich außerhalb der Trommel befindet wird über die Öffnungen 32 in dem Bauteil 3 und über die damit verbundenen Rohransätze 33 in den Innenraum der wannenförmigen Elektroden 2 gelenkt. Colder air, which is located outside of the drum is guided through the openings 32 in the component 3 and the associated pipe sockets 33 in the interior of the trough-shaped electrodes. 2 Dort wird der Luftstrom über die durch die Aussparungen 211 an den Elektroden 2 und damit zusammenwirkenden Erweiterungen 411 der Längsnuten 41 in dem Halterahmen 4 in den Innenraum 5 der Wäschetrommel geleitet. There, the air flow through which is passed through the recesses 211 on the electrodes 2 and cooperating extensions 411 of the longitudinal grooves 41 in the support frame 4 in the interior 5 of the laundry drum. Durch diese Luftführung wird die Innenseite der Elektroden stets gekühlt. Through these air guide the inside of the electrode is always cooled. Bereits dadurch erfährt jede der Elektroden 2 eine gewisse Kühlung. Already characterized each of the electrodes 2 undergoes some cooling. Darüber hinaus wird die Oberfläche der Elektroden 2, die dem Trommelinnenraum 5 zugewandt ist, zusätzlich durch das Vorbeistreichen kühlerer Luft an dieser Oberfläche der Elektrode 2 gekühlt. In addition, the surface of the electrode 2, which faces the interior of the drum 5, further cooled by the cooler air at this sweeps past surface of the electrode. 2 Die Kühlung erfolgt somit über den durch die Öffnungen 32, die Rohrstücke 33 und die Innenseite der Elektroden 2 gebildeten Kanal, sowie über die durch die Aussparungen 211 und Erweiterungen 411 gebildete definierte Spaltleckage. The cooling is thus effected via the through openings 32, the tubular pieces 33 and the inner side of the electrodes 2 formed channel and defined via the recesses formed by the extensions 211 and 411 gap leakage. Dadurch wird eine ideale Kühlung erzielt und ein Ausfallen von Mineralien und die Bildung von Schichten, die die Messergebnisse verfälschen, kann somit verhindert werden. Characterized an ideal cooling is achieved and precipitation of minerals and the formation of layers which distort the measurement results can be prevented.
    In In Figur 8 Figure 8 ist ein Wäschetrockner nach der Kondensationsbauart dargestellt, der einen Prozessluftstrom 11 und einen Kühlluftstrom 12 zum Kühlen des Prozessluftstroms 11 hat. a tumble dryer is illustrated after the condensation type which has a process air stream 11 and a cooling air flow 12 for cooling the process air stream. 11 Der Prozessluftstrom 11 wird über ein Gebläse 13, eine Heizeinrichtung 14, eine Trommel 15, ein Flusensieb (nicht dargestellt) und einen Kondensator 16 in einem geschlossenen Kreislauf geführt. The process air stream 11 (not shown) via a blower 13, a heater 14, a drum 15, a lint trap and guided a capacitor 16 in a closed circuit. Der Kondensator 16 wird über den mittels eines Gebläses 17 erzeugten Kühlluftstrom 12 gekühlt. The condenser 16 is cooled by the generated by a fan 17 cooling air flow 12th Zwischen dem Gebläse und dem Kondensator wird vom Kühlluftstrom 12 ein Teil - Kühlluftstrom 12a abgezweigt und auf die Rückseite der Elektroden 2 geleitet. Between the blower and the condenser by the cooling air flow 12, a part - branched cooling air stream 12a and guided to the rear side of the electrode. 2 Hierdurch kann auf vorteilhafte Weise der Kühlluftstrom 12 für den Kondensator 16 auch zum Kühlen der Elektroden 2 verwendet werden. This can also be used in an advantageous manner, the flow of cooling air 12 for the condenser 16 for cooling the electrodes. 2
  • Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. The invention is not limited to the illustrated embodiments. So kann bei der Vorrichtung der Luftkanal zum Durchströmen der Elektroden und Vorbeiströmen an der Oberfläche der Elektroden auch durch andere Mittel als die dargestellten Aussparungen und Erweiterungen gebildet werden. Thus, in the apparatus of the air duct to flow through the electrodes and flowing past the surface of the electrodes can also be formed by other means than the shown recesses and extensions. Es können beispielsweise Schlitze gebildet werden durch die die kältere Luft von der Innenseite der Elektroden an die Oberfläche der Elektroden gelangen können. It can for example be formed by slots which can enter the colder air from the inside of the electrodes to the surface of the electrodes. Soll die Erfindung an einem Trockner realisiert werden, der nicht nach dem oben beschriebenen Saugprinzip arbeitet, kann statt der Nutzung des Unterdrucks in der Wäschetrommel ein Gebläse verwendet werden, um kühlere Luft von außerhalb der Trommel über geeignete Kanäle oder über definierte Spaltleckagen an die Elektroden zu führen. Is to be implemented in a dryer, the invention which does not operate according to the above-described suction principle, a blower may be used instead of the use of the negative pressure in the drum to cooler air from outside of the drum through appropriate channels or via defined gap leaks to the electrode to to lead.
    Weiterhin ist es möglich Elektroden in einer solchen Art auszugestalten, dass diese an der dem Innenraum der Wäschetrommel abgewandten Seite mit einer Beschichtung, beispielsweise einem schwarzen Anstrich versehen sind, oder an dieser Seite Kühlflächen vorgesehen sind. It is also possible to design the electrodes in such a manner that they are on the side remote from the interior of the laundry drum with a coating, for example a black paint are provided, on this side or cooling surfaces are provided. Sind die Elektroden beispielsweise im Bereich des vorderen Lagerschildes angebracht können sich diese Kühlflächen in den Raum zwischen dem Lagerschild und der Gerätevorderwand erstrecken. If the electrodes are mounted, for example in the region of the front bearing plate, these cooling surfaces may extend in the space between the bearing plate and the front wall. Alternativ oder zusätzlich kann die Strömungsgeschwindigkeit der Luft hinter den Elektroden erhöht werden, wodurch die Wärmeabgabe der Elektroden erhöht und damit deren Temperatur gesenkt werden kann. Alternatively or additionally, the flow rate of air can be increased behind the electrodes, whereby the heat dissipation of the electrode increases and thus the temperature thereof can be lowered.
  • Vorzugsweise wird mit dem erfindungsgemäßen Wäschetrockner und dem erfindungsgemäßen Verfahren eine Temperaturdifferenz zwischen den Elektroden und benachbarten Oberflächen von mindestens 0,8°K, vorzugsweise mindestens 1°K und besonders bevorzugt mindestens 1,2°K eingestellt. Preferably, the dryer according to the invention and the inventive method, a temperature difference between the electrodes and adjacent surfaces of at least 0.8 ° K, preferably set to at least 1 ° K, and most preferably at least 1.2 ° K.
    Auch die Form der Elektroden ist nicht auf die dargestellte Form beschränkt. The shape of the electrodes is not limited to the illustrated shape. Die Elektroden können beispielsweise auch flach ausgebildet sein, oder einen v-förmigen Querschnitt aufweisen. The electrodes may for example also be formed flat, or have a V-shaped cross section. Ebenso können andere als die genannte Art der Befestigung der Elektroden an dem Bauteil verwendet werden. Likewise, other than the aforementioned method of attaching the electrodes can be used on the component. Hierfür kommen beispielsweise bekannte Rastmittel in Frage. For this example, known latching means come into question.
  • Die Kühlung der Elektroden kann, wie sich der Beschreibung entnehmen lässt, über unmittelbare Kühlung der dem Trommelinneren zugewandten Oberfläche der Elektroden erzielt werden. The cooling of the electrodes, as can be inferred from the description, are achieved via direct cooling of the side facing the drum interior surface of the electrodes. Alternativ oder zusätzlich dazu kann die Wärmeabfuhr und damit die Kühlung über die Rückseite der Elektrode indirekt erfolgen. Alternatively or additionally, the heat dissipation and hence the cooling over the back of the electrode may be indirect.
  • Zusammenfassend wird mit der vorliegenden Erfindung eine Möglichkeit geschaffen, den Leitwert der Wäsche, die in einem Trockner getrocknet werden soll, zuverlässig zu bestimmen, ohne dass der Benutzer die für die Messung verwendeten Elektroden manuell reinigen muss. In summary, a possibility is created with the present invention, to determine the conductivity of the laundry to be dried in a dryer reliably without the user needing to clean the electrodes used for the measurement manually.

Claims (13)

  1. Tumble dryer having at least one receiving area (5) for laundry and at least two electrodes (2) for measuring the conductance of the laundry, wherein at least one of the electrodes (2) is at least partly adjacent to this receiving area (5), characterised in that means are further provided in the tumble dryer to dissipate heat from at least one part of at least one of the electrodes (2), wherein the means for dissipating heat comprise air guidance means (32, 33, 211, 411) via which cooling air can be fed in and discharged, which are embodied to bring the electrodes (2) to a temperature lying below the process temperature in the tumble dryer.
  2. Tumble dryer according to claim 1, characterised in that the means for dissipating heat are arranged on the rear side of the electrodes (3).
  3. Tumble dryer according to claim 1 or 2, characterised in that the means are means for improving the radiation of heat from the electrodes (2) and/or that the means are cooling surfaces which are connected to the electrodes (2).
  4. Tumble dryer according to one of claims 1 to 3, characterised in that the electrodes are arranged on a component (3) in which openings (32) are embodied via which the cooling air can be fed in and discharged, wherein cooling air can preferably be fed in via a central opening (32) and discharged via a side opening (32).
  5. Tumble dryer according to claim 4, characterised in that the air guidance means are formed by defined false air openings (211, 411) in the vicinity of the electrodes (2) via which openings cooler air can be fed to the electrodes (2) from other parts of the tumble dryer.
  6. Tumble dryer according to claim 4 or 5, characterised in that the means comprise a fan or a source of compressed air.
  7. Tumble dryer according to one of claims 1 to 6, characterised in that means are provided via which a vacuum can be established in the receiving area (5) and the cooling means are defined false air openings (211, 411) via which the electrodes (2) can be supplied with cooler air from other parts of the tumble dryer or that a condenser is provided for condensing out water which is cooled via a cooling air flow, wherein one part of the cooling air flow can be used to cool the electrodes.
  8. Tumble dryer according to one of claims 1 to 7, characterised in that the electrodes (2) are installed in fixed manner in the tumble dryer, preferably are installed in the region of the front bearing shield.
  9. Method for preventing the formation of layers on electrodes (2) for measuring the conductance in a tumble dryer according to one of claims 1 to 8, wherein the temperature of the electrodes (2) is regulated in a controlled manner via the means for dissipating heat.
  10. Method according to claim 9, characterised in that the electrodes (2) are at least partly cooled.
  11. Method according to one of claims 9 and 10, characterised in that the electrodes (2) are brought to a temperature lying below the process temperature in the tumble dryer, preferably below the temperature of metal parts adjacent to the electrodes (2).
  12. Method according to one of claims 9 to 11, characterised in that the electrodes are cooled by means of air cooling.
  13. Method according to one of claims 9 to 12, characterised in that a vacuum is established in a receiving area (5) for laundry in the tumble dryer and the electrodes (2) are supplied with cooling air by cooler air being fed to the electrodes (2) from other parts of the tumble dryer via defined false air openings (211, 411).
EP03785811.5A 2002-12-20 2003-12-20 Drier comprising at least two electrodes for measuring the conductance of laundry, and method for preventing the formation of layers on electrodes Active EP1579053B1 (en)

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DE2002160149 DE10260149A1 (en) 2002-12-20 2002-12-20 An apparatus for determining the conductance of laundry, dryer and method for preventing film formation on electrode
DE10260149 2002-12-20
PCT/EP2003/014177 WO2004059072A1 (en) 2002-12-20 2003-12-20 Device for determining the conductance of laundry, drier, and method for preventing the formation of layers on electrodes

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US20110119951A1 (en) 2011-05-26
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