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EP2740829B2 - Washing machine or dishwasher with a device for introducing liquid washing or rinsing agent - Google Patents

Washing machine or dishwasher with a device for introducing liquid washing or rinsing agent Download PDF

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Publication number
EP2740829B2
EP2740829B2 EP12401241.0A EP12401241A EP2740829B2 EP 2740829 B2 EP2740829 B2 EP 2740829B2 EP 12401241 A EP12401241 A EP 12401241A EP 2740829 B2 EP2740829 B2 EP 2740829B2
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EP
European Patent Office
Prior art keywords
washing machine
rinsing agent
liquid
connecting line
pump
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Application number
EP12401241.0A
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German (de)
French (fr)
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EP2740829A1 (en
EP2740829B1 (en
Inventor
Michael Finke
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Miele und Cie KG
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Miele und Cie KG
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Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Priority to ES12401241T priority Critical patent/ES2559823T5/en
Priority to EP12401241.0A priority patent/EP2740829B2/en
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Publication of EP2740829B1 publication Critical patent/EP2740829B1/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
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/4418—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants in the form of liquids
    • 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 
    • D06F39/02—Devices for adding soap or other washing agents
    • D06F39/022—Devices for adding soap or other washing agents in a liquid state
    • 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
    • A47L15/44—Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
    • A47L15/449—Metering controlling devices

Definitions

  • the invention relates to an adding device for liquid washing or dishwashing liquid for a washing machine or dishwasher with a storage container for receiving the washing or rinsing agent and with a metering device by means of which the washing or rinsing agent by a pump and a connecting line in a metered amount the washing or rinsing process can be supplied and with a level monitoring device with respect to the existing in the reservoir washing or rinsing agent.
  • washing and dishwashing machines with the aforementioned equipment are currently available on the market, with which liquid washing or rinsing agents and washing aids can be supplied to the washing or rinsing process via an automatic dosing device.
  • the liquid agent is sucked from a reservoir by a pump and passed either directly into the tub or via the Ein Hamptonkasten in the incoming water.
  • the reservoir is equipped with a liquid level measuring device not described in detail, which should obviously be designed in the manner of a simple float switch.
  • a liquid level measuring device not described in detail, which should obviously be designed in the manner of a simple float switch.
  • other embodiments for such in question liquid level monitoring are well known.
  • the level in the reservoir z. B. calculated by the number of liquid additions to be determined.
  • the fill level can be detected by measuring the temperature, measuring the electrical resistance or measuring the power consumption of heating resistors.
  • the disadvantage of the known liquid level monitors is in particular that the known systems are relatively complex and expensive and are not suitable for all applications. With a float switch, only the empty state can be monitored reliably and resistance measurements generate only signals with a low signal strength. In addition, air bubbles that occur in the system during an empty state can not be detected and, moreover, falsify the measurement result. This can be a problem especially with liquid agents with a higher viscosity. In addition, the equipment of a reservoir with such level monitoring is unsuitable when a replaceable disposable container should come as a reservoir in question.
  • the invention thus raises the problem of providing an adding device of the input genanten type, in which the above-described disadvantages are avoided and with a level monitoring can be realized with simple means.
  • the achievable with the present invention consist in particular that not only a reliable blank level sensor is possible with the novel level sensor, but also a direct display of the current level can be done. Thus, the user can always inform himself about the currently available stock and set up accordingly for the purchase of new liquid.
  • a preferred embodiment provides to connect the pressure switch 5 directly to the connecting line between the reservoir 1 and pump 2, while the pressure monitor can even be traversed by the liquid to be conveyed.
  • a total of an adding device with integrated level monitoring of the reservoir is created, which can be placed both inside and outside the machine. It can be easily integrated into any existing system of washing machines and dishwashers via appropriate line connections.
  • Another advantage of the invention is that monitoring of the properly operating operation of the metering pump can likewise take place. In addition, it can be determined whether there are air bubbles in the system. If there is no negative pressure in the connecting line to the reservoir when the metering pump is switched on, this would be an indication of a defective metering pump. If the pressure switch detects irregular pressure peaks, this would be due to existing air bubbles.
  • FIG. 1 an adding device for a liquid, which is particularly suitable for use in a washing machine.
  • the storage container 1 serves to receive the liquid detergent 8.
  • the liquid detergent 8 is sucked by means of a pump 2 from the reservoir 1 and fed via the supply line 4 of the washing machine not shown here.
  • the liquid detergent passes from the reservoir 1 via a connecting line 3 in the addition process for the respective wash program.
  • a level sensor 5 is connected, which is designed in the known manner as a pressure monitor. Via the coupling point 10, the connecting line 3 can be connected to the reservoir 1.
  • a control device 6 symbolically indicated, among other things, controls the program-appropriate addition of the liquid and also evaluates the signals of the level sensor 5.
  • a display device 7 present on the washing machine, indications of the current filling level in the storage container 1 as well as possible malfunctions in the system can be displayed.
  • FIG. 2 is the arrangement according to FIG. 1 essentially the same.
  • the coupling point 10 is provided on the reservoir 1 in the upper region of the container. Otherwise, this automatic adding device operates in the same way as in FIG. 1 ,
  • FIG. 3 an embodiment is shown in which a replaceable canister with a relatively large capacity is provided for receiving the liquid medium.
  • the removal of the liquid agent 8 takes place here via a suction lance 9, which is connected according to the previous embodiments of the connecting line 3 of the system.
  • a pressure switch 5 is usually connected in its conventional use as a water level sensor via a hose, so that a so-called air trap between the water level and the pressure cell of the pressure switch can form.
  • the air present in the air trap is compressed by the ascending liquid and converts this into a pressure signal which can be tapped on a diaphragm in the pressure box of the pressure monitor.
  • a preferred embodiment is that the pressure switch 5 is coupled as directly as possible and without intermediate line path to the connecting line 3.
  • this embodiment is shown in more detail.
  • the pressure switch 5 is used as a connecting member via an input and an outlet nozzle in the connecting line 3, so that it is flowed through during the pumping operation quasi of the liquid medium.
  • the direct coupling of the pressure switch has the advantage that no venting must be provided and that measurement errors are largely avoided by sucked air.
  • the connecting line 3 - as shown in the embodiments - arranged below the ground level.
  • the connecting line 3 should be placed as low as possible in relation to the bottom of the reservoir 1
  • the reservoir is mounted in a prescribed height to the washing machine, within the washing machine or at an external site and the container is connected via a defined connecting line 3 to the suction side of the pump 2, the pressure in the connecting line 3 to a defined altitude in this line in a ventilated reservoir 1 only dependent on the level of the container and the density of the liquid medium.
  • the measured pressure corresponds to the product of medium density, the gravitational constant and the height the level 8 in the container above the position of the sensor
  • the size of the negative pressure and occurring pressure fluctuations can also be evaluated as a measure of the viscosity of the liquid medium.
  • the measuring range and the measuring sensitivity must be designed for the filling level in the storage tank and for the expected pump pressure. Furthermore, precautions must be taken to ensure that no air bubbles remain in the supply line to the pressure switch when refilling. Last but not least, the material properties of the sensor system must be matched to the washing and rinsing agents used. For the necessary elastic parts, silicone has proven itself here as a material for contact with the commercial washing and rinsing agents.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Washing And Drying Of Tableware (AREA)

Description

Die Erfindung betrifft eine Zugabevorrichtung für flüssige Wasch- oder Spülmittel für eine Wasch- oder Geschirrspülmaschine mit einem Vorratsbehälter zur Aufnahme des Wasch- oder Spülmittels und mit einer Dosiervorrichtung, mittels der das Wasch- oder Spülmittel durch eine Pumpe und über eine Verbindungsleitung in einer dosierten Menge dem Wasch- oder Spülvorgang zuführbar ist sowie mit einer Füllstandsüberwachungsvorrichtung bezüglich des im Vorratsbehälter vorhandenen Wasch- oder Spülmittels.The invention relates to an adding device for liquid washing or dishwashing liquid for a washing machine or dishwasher with a storage container for receiving the washing or rinsing agent and with a metering device by means of which the washing or rinsing agent by a pump and a connecting line in a metered amount the washing or rinsing process can be supplied and with a level monitoring device with respect to the existing in the reservoir washing or rinsing agent.

Es werden heute am Markt Wasch- und Geschirrspülmaschinen mit der vorgenannten Ausstattung angeboten, womit flüssige Wasch- oder Spülmittel sowie Waschhilfsmittel dem Wasch- oder Spülprozess über eine automatische Dosiervorrichtung zugeführt werden können. Üblicherweise wird dazu das Flüssigmittel aus einem Vorratsbehälter von einer Pumpe angesaugt und entweder direkt in den Laugenbehälter oder über den Einspülkasten in das zulaufende Wasser geleitet.Washing and dishwashing machines with the aforementioned equipment are currently available on the market, with which liquid washing or rinsing agents and washing aids can be supplied to the washing or rinsing process via an automatic dosing device. Usually, the liquid agent is sucked from a reservoir by a pump and passed either directly into the tub or via the Einspülkasten in the incoming water.

Zum Beispiel ist es aus der DE 39 01 686 A1 bekannt, eine Waschmaschine mit einer Dosiereinrichtung auszurüsten, bei der der Vorratsbehälter im unteren Bereich der Maschine platziert ist. Dabei ist der Vorratsbehälter mit einer nicht näher beschriebenen Flüssigkeitsniveaumesseinrichtung ausgestattet, die offensichtlich in der Art eines einfachen Schwimmerschalters ausgebildet sein soll.
Neben der Verwendung eines Schwimmerschalters sind auch andere Ausgestaltungen für eine derart in Frage kommende Flüssigkeitsstandsüberwachung hinreichend bekannt. In einfachster Form besteht der Vorratsbehälter für das Flüssigmittel aus einem durchsichtigen Material, so dass eine optische Kontrolle über die vorhandene Restmenge möglich ist. Diese Anwendungsform ist aber nicht komfortabel und lässt sich auch in die vorhandenen Strukturen der modernen Wasch- und Geschirrspülmaschinen nicht sinnvoll einsetzen.
Andere Lösungsvorschläge sehen vor, den Füllstand im Vorratsbehälter z. B. rechnerisch über die Anzahl der durchgeführten Flüssigkeitszugaben zu ermitteln. Weiterhin kann der Füllstand über die Messung der Temperatur, der Messung des elektrischen Widerstandes oder Messung der Leistungsaufnahme von Heizwiderständen erfasst werden.For example, it is from the DE 39 01 686 A1 known to equip a washing machine with a metering device, wherein the reservoir is placed in the lower part of the machine. In this case, the reservoir is equipped with a liquid level measuring device not described in detail, which should obviously be designed in the manner of a simple float switch.
In addition to the use of a float switch, other embodiments for such in question liquid level monitoring are well known. In the simplest form of the reservoir for the liquid agent of a transparent material, so that a visual control of the remaining amount is possible. However, this form of application is not comfortable and can not be meaningfully used in the existing structures of modern washing machines and dishwashers.
Other solutions suggest, the level in the reservoir z. B. calculated by the number of liquid additions to be determined. Furthermore, the fill level can be detected by measuring the temperature, measuring the electrical resistance or measuring the power consumption of heating resistors.

Der Nachteil der vorbekannten Flüssigkeitsstandsüberwachungen besteht insbesondere darin, dass die bekannten Systeme relativ aufwändig und teuer sind und sich nicht für alle Anwendungsfälle eignen. Mit einem Schwimmerschalter lässt sich in der Regel nur der Leerzustand zuverlässig überwachen und Widerstandsmessungen generieren nur Signale mit einer geringen Signalstärke. Außerdem können gerade bei einem Leerzustand im System auftretende Luftblasen nicht erkannt werden und im übrigen das Messergebnis verfälschen. Dies kann gerade bei Flüssigmitteln mit einer höheren Viskosität ein Problem darstellen.
Außerdem ist die Ausrüstung eines Vorratsbehälters mit einer derartigen Füllstandsüberwachung ungeeignet, wenn ein auswechselbarer Einwegbehälter als Vorratsbehälter in Frage kommen soll.The disadvantage of the known liquid level monitors is in particular that the known systems are relatively complex and expensive and are not suitable for all applications. With a float switch, only the empty state can be monitored reliably and resistance measurements generate only signals with a low signal strength. In addition, air bubbles that occur in the system during an empty state can not be detected and, moreover, falsify the measurement result. This can be a problem especially with liquid agents with a higher viscosity.
In addition, the equipment of a reservoir with such level monitoring is unsuitable when a replaceable disposable container should come as a reservoir in question.

Der Erfindung stellt sich somit das Problem, eine Zugabevorrichtung der Eingangs genanten Art bereit zu stellen, bei der die vorbeschriebenen Nachteile vermieden werden und mit der eine Füllstandsüberwachung mit einfachen Mitteln realisiert werden kann.The invention thus raises the problem of providing an adding device of the input genanten type, in which the above-described disadvantages are avoided and with a level monitoring can be realized with simple means.

Erfindungsgemäß wird dieses Problem durch eine Zugabevorrichtung für flüssige Wasch- oder Spülmittel mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this problem is solved by an adding device for liquid washing or rinsing agents having the features of patent claim 1. Advantageous embodiments and further developments of the invention will become apparent from the following subclaims.

Die mit der Erfindung erreichbaren Vorteile bestehen insbesondere darin, dass mit dem neuartigen Füllstandssensor nicht nur eine zuverlässige Leerstandssensierung möglich ist, sondern auch eine direkte Anzeige des aktuellen Füllstandes erfolgen kann. Somit kann sich der Benutzer immer über den augenblicklich noch vorhandenen Vorrat informieren und sich für den Nachkauf von neuem Flüssigmittel entsprechend einrichten.The achievable with the present invention consist in particular that not only a reliable blank level sensor is possible with the novel level sensor, but also a direct display of the current level can be done. Thus, the user can always inform himself about the currently available stock and set up accordingly for the purchase of new liquid.

Mit dem neuen Füllstandssensor ist weiterhin eine preiswerte Möglichkeit geschaffen, mit der aussagefähige Signale generierbar sind. Die als Füllstandssensor in Frage kommenden Druckwächter sind sehr robust und arbeiten seit langem bei Wasch- und Geschirrspülmaschinen zuverlässig und genau. Außerdem sind die Steuereinrichtungen in Wasch- oder Geschirrspülmaschinen sehr gut darauf abgestimmt, die Signale eines Druckwächters auszuwerten.With the new level sensor, a cost-effective option is still created with which meaningful signals can be generated. The available as a level sensor in question pressure monitors are very robust and have long been working reliably and accurately in washing machines and dishwashers. In addition, the control devices in washing machines or dishwashers are very well adapted to evaluate the signals of a pressure switch.

Eine bevorzugte Ausführungsform sieht vor, den Druckwächter 5 direkt an die Verbindungsleitung zwischen Vorratsbehälter 1 und Pumpe 2 anzuschließen, dabei kann der Druckwächter sogar von dem zu fördernden Flüssigmittel durchströmt werden.A preferred embodiment provides to connect the pressure switch 5 directly to the connecting line between the reservoir 1 and pump 2, while the pressure monitor can even be traversed by the liquid to be conveyed.

Durch die erfindungsgemäße Ausführungsform wird insgesamt eine Zugabevorrichtung mit integrierter Füllstandsüberwachung des Vorratsbehälters geschaffen, die sowohl innerhalb als auch außerhalb der Maschine platziert werden kann. Sie lässt sich über entsprechende Leitungsverbindungen in einfacher Weise in jedes vorhandene System einer Wasch- und Geschirrspülmaschinen integrieren.By the embodiment according to the invention a total of an adding device with integrated level monitoring of the reservoir is created, which can be placed both inside and outside the machine. It can be easily integrated into any existing system of washing machines and dishwashers via appropriate line connections.

Ein weiterer Vorteil der Erfindung besteht noch darin, dass ebenfalls eine Überwachung des ordnungsgemäß arbeitenden Betriebs der Dosierpumpe erfolgen kann. Zudem kann festgestellt werden, ob sich Luftblasen im System befinden. Wenn sich bei eingeschalteter Dosierpumpe in der Verbindungsleitung zum Vorratsbehälter kein Unterdruck einstellt, wäre dies ein Hinweis auf eine defekte Dosierpumpe. Sollten der Druckwächter unregelmäßige Druckspitzen feststellen, wäre dies auf vorhandene Luftblasen zurückzuführen.Another advantage of the invention is that monitoring of the properly operating operation of the metering pump can likewise take place. In addition, it can be determined whether there are air bubbles in the system. If there is no negative pressure in the connecting line to the reservoir when the metering pump is switched on, this would be an indication of a defective metering pump. If the pressure switch detects irregular pressure peaks, this would be due to existing air bubbles.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt:

Figur 1
in vereinfachter Darstellung an Hand einer Prinzipskizze eine Zugabevorrichtung für flüssige Wasch- oder Spülmittel,
Figur 2
die Zugabevorrichtung gemäß Figur 1 in einer abgewandelten Form
Figur 3
in einem weiteren Ausführungsbeispiel die Zugabevorrichtung mit einer in einen Kanister eingreifenden Sauglanze,
Figur 4
die Zugabevorrichtung gemäß Figur 1, bei der der Druckwächter direkt an die Verbindungsleitung 3 angekoppelt ist und
Figur 5
die Zugabevorrichtung gemäß Figur 4, bei der Druckwächter in die Verbindungsleitung eingesetzt ist.
An embodiment of the invention is shown purely schematically in the drawings and will described in more detail below. It shows:
FIG. 1
in a simplified representation with reference to a schematic diagram of an adding device for liquid detergents or dishwashing detergents,
FIG. 2
the adding device according to FIG. 1 in a modified form
FIG. 3
in a further embodiment, the adding device with a suction lance engaging in a canister,
FIG. 4
the adding device according to FIG. 1 in which the pressure monitor is coupled directly to the connecting line 3 and
FIG. 5
the adding device according to FIG. 4 where the pressure switch is inserted in the connection line.

In der Figur 1 ist eine Zugabevorrichtung für ein Flüssigmittel dargestellt, welche sich besonders für den Einsatz bei einer Waschmaschine eignet. Dabei dient der Vorratsbehälter 1 der Aufnahme des flüssigen Waschmittels 8.
Das flüssige Waschmittel 8 wird mittels einer Pumpe 2 aus dem Vorratsbehälter 1 angesaugt und über die Zuführleitung 4 der hier nicht näher dargestellten Waschmaschine zugeführt. Das flüssige Waschmittel gelangt dabei aus dem Vorratsbehälter 1 über eine Verbindungsleitung 3 in den Zugabeprozess für das jeweilige Waschprogramm. An der Verbindungsleitung 3 ist ein Füllstandssensor 5 angeschlossen, der in der bekannten Weise als Druckwächter ausgebildet ist. Über die Koppelstelle 10 ist die Verbindungsleitung 3 an den Vorratsbehälter 1 anschließbar.In the FIG. 1 is shown an adding device for a liquid, which is particularly suitable for use in a washing machine. The storage container 1 serves to receive the liquid detergent 8.
The liquid detergent 8 is sucked by means of a pump 2 from the reservoir 1 and fed via the supply line 4 of the washing machine not shown here. The liquid detergent passes from the reservoir 1 via a connecting line 3 in the addition process for the respective wash program. On the connecting line 3, a level sensor 5 is connected, which is designed in the known manner as a pressure monitor. Via the coupling point 10, the connecting line 3 can be connected to the reservoir 1.

Weiterhin ist in der Figur 1 noch eine Steuereinrichtung 6 symbolisch angedeutet, die u.a. die programmgemäße Zugabe des Flüssigmittels steuert und auch die Signale des Füllstandssensors 5 auswertet. Über eine an der Waschmaschine vorhandene Anzeigevorrichtung 7 können Hinweise der den aktuellen Füllstand im Vorratsbehälter 1 sowie über eventuelle Störungen im System angezeigt werden.Furthermore, in the FIG. 1 a control device 6 symbolically indicated, among other things, controls the program-appropriate addition of the liquid and also evaluates the signals of the level sensor 5. By means of a display device 7 present on the washing machine, indications of the current filling level in the storage container 1 as well as possible malfunctions in the system can be displayed.

In der Figur 2 ist die Anordnung gemäß Figur 1 im Wesentlichen gleich. Hier ist lediglich die Koppelstelle 10 am Vorratsbehälter 1 im oberen Bereich des Behälters vorgesehen. Ansonsten arbeitet diese automatische Zugabevorrichtung in gleicher Weise wie die in Figur 1.In the FIG. 2 is the arrangement according to FIG. 1 essentially the same. Here only the coupling point 10 is provided on the reservoir 1 in the upper region of the container. Otherwise, this automatic adding device operates in the same way as in FIG. 1 ,

In der Figur 3 ist eine Ausführungsform dargestellt, bei der ein auswechselbarer Kanister mit relativ großer Kapazität zur Aufnahme des Flüssigmittels vorgesehen ist. Die Entnahme des Flüssigmittels 8 erfolgt hier über eine Sauglanze 9, die entsprechend den vorherigen Ausgestaltungen an die Verbindungsleitung 3 des Systems angeschlossen ist.In the FIG. 3 an embodiment is shown in which a replaceable canister with a relatively large capacity is provided for receiving the liquid medium. The removal of the liquid agent 8 takes place here via a suction lance 9, which is connected according to the previous embodiments of the connecting line 3 of the system.

Wie bekannt wird ein Druckwächter 5 in seiner herkömmlichen Verwendungsweise als Wasserstandssensor in der Regel über eine Schlauchleitung angeschlossen, so dass sich eine so genannte Luftfalle zwischen dem Wasserstand und der Druckdose des Druckwächters bilden kann. Durch das Prinzip kommunizierender Röhren wird die in der Luftfalle durch die aufsteigende Flüssigkeit vorhandene Luft komprimiert und setzt dies in ein Drucksignal um, welches an einer Membran in der Druckdose des Druckwächters abgreifbar ist.As is known, a pressure switch 5 is usually connected in its conventional use as a water level sensor via a hose, so that a so-called air trap between the water level and the pressure cell of the pressure switch can form. By virtue of the principle of communicating tubes, the air present in the air trap is compressed by the ascending liquid and converts this into a pressure signal which can be tapped on a diaphragm in the pressure box of the pressure monitor.

Im vorliegenden Fall besteht eine bevorzugte Ausführungsform darin, dass der Druckwächter 5 möglichst direkt und ohne dazwischen liegenden Leitungsweg an die Verbindungsleitung 3 angekoppelt wird. In der Figur 4 ist diese Ausgestaltung näher dargestellt. In der Figur 5 ist ein Ausführungsbeispiel gezeigt, in dem der Druckwächter 5 als Verbindungsglied über einen Eingangs- und einen Ausgangsstutzen in die Verbindungsleitung 3 eingesetzt ist, so dass er während des Pumpbetriebs quasi von dem Flüssigmittel durchströmt wird. Die direkte Ankopplung des Druckwächters besitzt den Vorteil, dass keine Entlüftung vorgesehen sein muss und dass Messfehler durch angesaugte Luft weitestgehend vermieden werden.In the present case, a preferred embodiment is that the pressure switch 5 is coupled as directly as possible and without intermediate line path to the connecting line 3. In the FIG. 4 this embodiment is shown in more detail. In the FIG. 5 an embodiment is shown in which the pressure switch 5 is used as a connecting member via an input and an outlet nozzle in the connecting line 3, so that it is flowed through during the pumping operation quasi of the liquid medium. The direct coupling of the pressure switch has the advantage that no venting must be provided and that measurement errors are largely avoided by sucked air.

In vorteilhafter Ausgestaltung ist die Verbindungsleitung 3 - wie in den Ausführungsbeispielen gezeigt - unterhalb des Bodenniveaus angeordnet. Um hier immer ein ausreichendes Drucksignal zur Verfügung zu haben, sollte die Verbindungsleitung 3 möglichst tief in Relation zum Boden des Vorratsbehälter 1 platziert werdenIn an advantageous embodiment, the connecting line 3 - as shown in the embodiments - arranged below the ground level. To always have a sufficient pressure signal available here, the connecting line 3 should be placed as low as possible in relation to the bottom of the reservoir 1

Wenn der Vorratsbehälter in einer festgeschriebenen Höhe zum Waschautomaten, innerhalb des Waschautomaten oder an einem äußeren Aufstellungsort angebracht ist und der Behälter über eine definierte Verbindungsleitung 3 an die Saugseite der Pumpe 2 angeschlossen ist, so ist der Druck in der Verbindungsleitung 3 an eine definierte Höhenlage in dieser Leitung bei einem belüfteten Vorratsbehälter 1 nur noch vom Füllstand des Behälters und der Dichte des Flüssigkeitsmediums abhängig.If the reservoir is mounted in a prescribed height to the washing machine, within the washing machine or at an external site and the container is connected via a defined connecting line 3 to the suction side of the pump 2, the pressure in the connecting line 3 to a defined altitude in this line in a ventilated reservoir 1 only dependent on the level of the container and the density of the liquid medium.

Wird nun in eine Verbindungsleitung 3 zwischen dem Vorratsbehälter 1 und einer ansaugenden Dosierpumpe 2 ein Drucksensor an die Verbindungsleitung an einem Punkt angeschlossen, der etwas unterhalb des tiefsten Punkts des Vorratsbehälters liegt, so entspricht der gemessene Druck dem Produkt aus Mediumsdichte, der Gravitationskonstanten und der Höhe des Füllstands 8 im Behälter über der Lage des Sensors,Now, if a pressure sensor connected to the connecting line at a point which is slightly below the lowest point of the reservoir in a connecting line 3 between the reservoir 1 and a suctioning metering pump 2, the measured pressure corresponds to the product of medium density, the gravitational constant and the height the level 8 in the container above the position of the sensor,

Wird nun der letzte Teil der Verbindungsleitung 3 oder des Vorratsbehälter 1 geometrisch so gestaltet, dass auf einen relativ großen Höhenunterschied nur ein kleines Volumen fällt, so ist der Volumenfehler bedingt durch die Dichteunterschiede von bekannten Waschmitteln vergleichsweise gering. Es ist somit eine quasikontinuierliche Füllstandsanzeige möglich.Now, if the last part of the connecting line 3 or the reservoir 1 geometrically designed so that falls to a relatively large height difference only a small volume, the volume error is due to the density differences of known detergents is comparatively low. It is thus a quasi-continuous level indicator possible.

Prinzipiell ist es im angesaugten Zustand unerheblich, ob der Vorratsbehälter 1 unten, oben oder über eine Sauglanze 9 an die Saugseite der Pumpe angeschlossen wird. Wird nun die Pumpe 2 in Betrieb gesetzt, so entsteht in der Verbindungsleitung 3 zwischen Vorratsbehälter 1 und Pumpe 2 ein Unterdruck, der auch vom Druckwächter 5 gemessen wird. Nach der Förderung der Flüssigkeit stellt sich als Druck wieder der durch den Füllstand im Behälter resultierende Schweredruck ein. Durch diese beim Fördern entstehenden Unterdruck kann erkannt werden, ob die Pumpe ordnungsgemäß arbeitet oder ob irgendein Defekt vorliegt. Sollte sich Luft in der Verbindungsleitung 3 befinden, so tritt eine starke Schwankung des Unterdrucks auf, was als eindeutig zu differenzierendes Signal für einen Leerstand im Vorratsbehälter 1 oder als Hinweis auf vorhandene Luftblasen ausgewertet werden kann.In principle, it is irrelevant in the sucked state, whether the reservoir 1 below, above or via a suction lance 9 is connected to the suction side of the pump. Now, if the pump 2 is put into operation, the result is in the connecting line 3 between the reservoir 1 and pump 2, a negative pressure, which is also measured by the pressure switch 5. After the promotion the liquid re-establishes as pressure again the gravitational pressure resulting from the level in the container. This negative pressure created during delivery can be used to detect whether the pump is working properly or whether there is any defect. If there is air in the connecting line 3, so there is a large fluctuation of the negative pressure, which can be evaluated as clearly differentiated signal for a vacancy in the reservoir 1 or as an indication of existing air bubbles.

Die Größe des Unterdrucks und auftretende Druckschwankungen können weiterhin auch als Maß für die Viskosität des Flüssigkeitsmediums ausgewertet werden.The size of the negative pressure and occurring pressure fluctuations can also be evaluated as a measure of the viscosity of the liquid medium.

Bei der Wahl und der Ausbildung des Druckwächters sind natürlich einige Besonderheiten aufgrund der speziellen Anwendung zu berücksichtigen. Der Messbereich und die Messempfindlichkeit müssen für den Füllstand im Vorratsbehälter sowie für den zu erwartenden Pumpendruck ausgelegt sein. Weiterhin sind Vorkehrungen zu treffen, damit bei einer Neubefüllung keine Luftblasen in der Zuleitung zum Druckwächter verbleiben.
Nicht zuletzt müssen die Materialeigenschaften des Sensorsystems auf die verwendeten Wasch- und Spülmittel abgestimmt sein. Für die notwendigen elastischen Teile hat sich hier Silikon als Material für den Kontakt mit den handelsüblichen Wasch- und Spülmitteln bewährt.In the choice and training of the pressure switch, of course, some special features due to the specific application must be considered. The measuring range and the measuring sensitivity must be designed for the filling level in the storage tank and for the expected pump pressure. Furthermore, precautions must be taken to ensure that no air bubbles remain in the supply line to the pressure switch when refilling.
Last but not least, the material properties of the sensor system must be matched to the washing and rinsing agents used. For the necessary elastic parts, silicone has proven itself here as a material for contact with the commercial washing and rinsing agents.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

  • 1. Vorratsbehälter1st storage container
  • 2. Pumpe (Dosierpumpe)2nd pump (dosing pump)
  • 3. Verbindungsleitung3. Connecting line
  • 4. Zuführleitung4. Feed line
  • 5. Füllstandsensor (Druckwächter)5. Level sensor (pressure monitor)
  • 6. Steuervorrichtung6. Control device
  • 7. Anzeigevorrichtung7. Display device
  • 8. Flüssigmittel (Wasch- und Spülmittel)8. Liquid agent (washing and rinsing agent)
  • 9. Sauglanze9. Suction lance
  • 10. Koppelstelle10. Coupling point

Claims (10)

  1. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher comprising a storage container for receiving the detergent or rinsing agent and comprising a metering device by means of which the detergent or rinsing agent can be introduced by means of a pump via a connecting line, in a metered amount, to the washing or rinsing procedure, and comprising a level monitoring device for the detergent or rinsing agent present in the storage container, a pressure monitor being used as the level sensor (5) for the level of liquid present in the storage container (1),
    characterised in that
    the pressure monitor (5) is connected to the connecting line (3) between the storage container (1) and the pump (2), and in that the signals of the pressure monitor (5) are directed, in conjunction with a control device (6), to a display device (7) of the washing machine or dishwasher, information indicating a fault in the system caused by a defect in the pump (2) or by air bubbles present in the intake region of the pump (2) being shown in this display device (7).
  2. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to claim 1,
    characterised in that
    the pressure monitor (5) is formed such that it can be directly coupled to the connecting line (3) via a connecting device.
  3. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to claim 1,
    characterised in that
    the pressure monitor (5) is inserted in the connecting line (3), by means of an inlet connection piece and an outlet connection piece, so that the liquid flows through said pressure monitor during operation of the pump.
  4. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to one or more of the preceding claims 1 to 3,
    characterised in that
    the connecting line (3) is arranged level with the base of the storage container (1) or below the base level thereof.
  5. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to one or more of the preceding claims 1 to 4,
    characterised in that
    the signals of the pressure monitor (5) are directed, in conjunction with a control device (6), to a display device (7) of the washing machine or dishwasher, information regarding the current level of liquid (8) in the storage container (1) being shown in this display device (7).
  6. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to claim 1,
    characterised in that
    the vacuum occurring in the connecting line (3) during the operation of the pump (2) can be evaluated as the measurement value for the proper operation of the pump.
  7. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to claim 1,
    characterised in that
    the fluctuation margin, occurring during operation of the pump (2), of the pressure signal present at the pressure monitor can be evaluated by the control device (6) as the measure for the viscosity of the liquid medium.
  8. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to one or more of claims 1 to 7,
    characterised in that
    the measurement range and the measurement sensitivity of the pressure monitor (5) are designed for the liquid level in the storage container (1) and for the pump pressure that is to be expected in the connecting line (3).
  9. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to one or more of claims 1 to 8,
    characterised in that
    a venting device is fixed in the connecting line (3) or on the pressure monitor (5).
  10. Feed device for liquid detergent or rinsing agent for a washing machine or dishwasher according to one or more of claims 1 to 9,
    characterised in that
    the connecting line (3) and the parts that come in contact with the detergent and rinsing agent at the pressure monitor (5) consist of a material that is resistant to these liquid media, preferably of silicon.
EP12401241.0A 2012-12-04 2012-12-04 Washing machine or dishwasher with a device for introducing liquid washing or rinsing agent Active EP2740829B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES12401241T ES2559823T5 (en) 2012-12-04 2012-12-04 Washing machine or dishwasher with a dosing unit for detergents or liquid lighters
EP12401241.0A EP2740829B2 (en) 2012-12-04 2012-12-04 Washing machine or dishwasher with a device for introducing liquid washing or rinsing agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12401241.0A EP2740829B2 (en) 2012-12-04 2012-12-04 Washing machine or dishwasher with a device for introducing liquid washing or rinsing agent

Publications (3)

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EP2740829A1 EP2740829A1 (en) 2014-06-11
EP2740829B1 EP2740829B1 (en) 2015-12-02
EP2740829B2 true EP2740829B2 (en) 2019-03-06

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ES (1) ES2559823T5 (en)

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CN104947380B (en) * 2014-03-26 2017-10-27 无锡小天鹅股份有限公司 Box component for washing agent and the washing machine with it
DE102019124690A1 (en) * 2019-09-13 2021-03-18 Miele & Cie. Kg Dosing device and method for dosing a fluid mixture for a cleaning device and cleaning device
CN113796815B (en) * 2020-06-15 2023-03-07 佛山市顺德区美的洗涤电器制造有限公司 Dispensing device and dish washing machine
CN112647240B (en) * 2020-11-28 2021-12-14 珠海格力电器股份有限公司 Detergent feeding method, feeding control device, readable storage medium and washing machine
KR20240097450A (en) * 2022-12-20 2024-06-27 엘지전자 주식회사 Dish washer

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DE3440848A1 (en) † 1984-11-08 1986-05-22 Hans 8900 Augsburg Biermaier Method and device for controlling the foam formation in tank-type washing machines, in particular disinfectant dishwashers
EP1475472A2 (en) † 2003-04-25 2004-11-10 Lg Electronics Inc. Wash water-circulating apparatus for washing machines and method of controlling the same
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US7784310B1 (en) † 2006-04-18 2010-08-31 Bradford Stephen D Automatic batch article washing machine
US20120272692A1 (en) † 2011-04-28 2012-11-01 General Electric Company Additive storage tank for a washing machine

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DE3901686A1 (en) 1989-01-21 1990-07-26 Miele & Cie WASHING MACHINE OR WASHING DRYER WITH A DOSING DEVICE
DE19643270A1 (en) * 1996-10-19 1998-04-23 Miele & Cie Dispensing device, for dishwasher etc. uses feed pump
IT1393756B1 (en) * 2008-07-28 2012-05-08 Indesit Co Spa WASHING MACHINE PROVIDED WITH LONG LOAD TANKS

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Publication number Priority date Publication date Assignee Title
DE2921958A1 (en) † 1979-05-30 1980-12-11 Miele & Cie Washing agent dispenser for automatic washing machines - comprising external reservoir of pre-dissolved powder with automatic injector valve in machine
DE3440848A1 (en) † 1984-11-08 1986-05-22 Hans 8900 Augsburg Biermaier Method and device for controlling the foam formation in tank-type washing machines, in particular disinfectant dishwashers
EP1475472A2 (en) † 2003-04-25 2004-11-10 Lg Electronics Inc. Wash water-circulating apparatus for washing machines and method of controlling the same
US20050072195A1 (en) † 2003-10-02 2005-04-07 Laundrox, Inc. Chemical dispenser
US7784310B1 (en) † 2006-04-18 2010-08-31 Bradford Stephen D Automatic batch article washing machine
US20120272692A1 (en) † 2011-04-28 2012-11-01 General Electric Company Additive storage tank for a washing machine

Also Published As

Publication number Publication date
EP2740829A1 (en) 2014-06-11
EP2740829B1 (en) 2015-12-02
ES2559823T5 (en) 2019-06-17
ES2559823T3 (en) 2016-02-16

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