EP2995715B1 - Household appliance for drying laundry, comprising a temperature sensor - Google Patents

Household appliance for drying laundry, comprising a temperature sensor Download PDF

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Publication number
EP2995715B1
EP2995715B1 EP15183112.0A EP15183112A EP2995715B1 EP 2995715 B1 EP2995715 B1 EP 2995715B1 EP 15183112 A EP15183112 A EP 15183112A EP 2995715 B1 EP2995715 B1 EP 2995715B1
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EP
European Patent Office
Prior art keywords
temperature
temperature sensor
predetermined
laundry
condensate collecting
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
EP15183112.0A
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German (de)
French (fr)
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EP2995715A1 (en
Inventor
Marcus Simon
Maike Blanken
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to PL15183112T priority Critical patent/PL2995715T3/en
Publication of EP2995715A1 publication Critical patent/EP2995715A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/58—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to condensation, e.g. condensate water level
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D06F2105/60—Audible signals
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/50—Responding to irregular working conditions, e.g. malfunctioning of blowers

Definitions

  • the invention relates to a domestic appliance for drying laundry, comprising at least one condensate collecting basin, at least one temperature sensor which is arranged at least partially below a predetermined filling level of the condensate collecting basin, and at least one electronic control and / or regulating unit connected in terms of communication technology with the temperature sensor Control and / or regulating unit is arranged to determine from the temperature signals of the temperature sensor, whether an instantaneous liquid level in the condensate collecting basin will reach or has reached the predetermined level.
  • the invention relates to a method for monitoring a liquid level in a condensate collecting basin of a household appliance for drying laundry by means of at least one temperature sensor which is at least partially disposed below a predetermined filling level of the condensate collecting basin, wherein it is determined from the temperature signals of the temperature sensor, whether an instantaneous liquid level in the condensate collecting basin, the predetermined filling level will reach or has reached.
  • moist, warm process air is cooled and dehumidified by supplied cooling water.
  • the cooling water is collected in a tub of the washer dryer.
  • a temperature sensor is provided which is used in addition to measuring a temperature of the process air to a measurement of the filling level of the cooling water in the tub.
  • cooling water is pumped out of the tub.
  • From the JP 2008-73089 A goes out a laundry drying machine, which has a heat pump. This is a self-heated temperature sensor for determining a level in a reservoir for condensate.
  • condensation clothes dryer laundry is dried using condensation drying.
  • a heated process air which is passed through a chamber containing the laundry to be dried, for example a laundry drum, absorbs moisture. This moisture is then condensed out of the process air used for drying the laundry at a heat exchanger of the tumble dryer. The water thus condensed out of the process air used for drying the laundry is collected in a condensate collecting basin of the tumble dryer.
  • the liquid level within the condensate catch basin must be monitored in order to prevent overflow of the condensate catch basin, for example in the presence of clogging of a drain of the condensate catch basin.
  • a pair of electrodes can be arranged on the condensate collecting basin, which comes into contact with the water contained in the condensate collecting basin from a predetermined liquid level in the condensate collecting basin. As a result, an electrical short circuit is generated via the electrode pair, which can be evaluated by an electronics of the tumble dryer.
  • a float switch can be used to monitor the liquid level in the condensate collection basin, which can have, for example, reed contacts which can be closed via a magnet located in the float switch, whereby also an evaluable by the electronics of the tumble electric short circuit can be displayed.
  • the temperature of the process air used to dry the laundry can be monitored in order to optimize controlled variables of the operation of the conventional tumble dryer, such as its controllable heating capacity.
  • a temperature sensor can be arranged in an air path which is present on a bearing plate of the conventional tumble dryer. The monitoring of the temperature of the process air used for drying is dependent on the leaching state of the temperature sensor, since occurring during operation of the clothes dryer moist lint deposits on the temperature sensor can lead to a faulty temperature measurement.
  • the EP 2 415 927 A2 relates to a clothes dryer with a heat pump, a condensate collecting basin arranged below an evaporator of the heat pump and a temperature measuring unit, which is arranged below a predetermined filling level of the condensate collecting basin, from which the condensate collecting basin would overflow.
  • a temperature of a refrigerant discharged from a compressor of the heat pump is monitored, which temperature is the maximum temperature of the refrigerant within the heat pump, and is usually between 80 ° C and 100 ° C. If there is water in the condensate collecting basin, which normally has a temperature of around 20 ° C, the temperature measuring unit measured temperature significantly reduced. If the temperature measured by the temperature measuring unit falls below a predetermined temperature limit value, it is concluded from this that there is a maximum liquid level in the condensate collecting basin and a corresponding signal is generated.
  • the object of the invention is to enable reliable and cost-effective monitoring of the temperature of a process air used for drying laundry in a domestic appliance for drying laundry and monitoring of the liquid level within a condensate collecting basin of the domestic appliance.
  • the household appliance according to the invention for drying laundry comprising at least one condensate collecting basin, at least one temperature sensor, which is arranged at least partially below a predetermined filling level of the condensate collecting basin, and at least one electronic control and / or regulating unit communicatively connected to the temperature sensor, wherein the electronic control unit and / or control unit is arranged to determine from the temperature signals of the temperature sensor, whether an instantaneous liquid level in the condensate collecting basin will reach or has reached the predetermined level, is characterized in particular by the fact that the temperature sensor is set up and arranged, a temperature of drying To detect the laundry used process air and to generate corresponding temperature signals.
  • a single temperature sensor can be used both for monitoring the temperature of the process air used for drying laundry in the domestic appliance and for monitoring the liquid level within the condensate collecting basin of the household appliance.
  • This is in contrast to a use of one temperature sensor each for monitoring the temperature of a process air used for drying laundry in a tumble dryer on the one hand and for monitoring a liquid level within a condensate collecting basin the tumble dryer on the other hand connected with a component savings and resulting cost advantages.
  • said monitoring can be carried out continuously or in time-spaced monitoring steps.
  • the temperature sensor can detect the temperature of the process air used for drying the laundry and generate corresponding temperature signals which are transmitted via a wireless or wired communication connection be forwarded to the electronic control and / or regulating unit, which performs the monitoring of the liquid level in the condensate collection basin.
  • the electronic control and / or regulating device can infer whether an instantaneous liquid level in the condensate collecting basin will reach or have reached the predetermined filling level. If the predetermined level is reached, the electronic control and / or regulating unit can generate and output a corresponding electrical warning signal.
  • the electrical warning signal can be used to further control the household appliance.
  • the household appliance can be stopped or switched off in the presence of the electrical warning signal.
  • the electrical warning signal for a user of the household appliance can be made acoustically and / or optically detectable.
  • the specified fill level may be a maximum fill level of the condensate catch basin, from which point the condensate catch basin would overflow.
  • the predetermined fill level may be below the maximum fill level to provide a catch reserve before the condensate catch basin overflows.
  • the electronic control and / or regulating unit may have a microcontroller and suitable evaluation software.
  • the electronic control and / or regulating unit can be integrated in a conventional electronics of the household appliance or arranged separately from the usual electronics and communication technology connected to the usual electronics.
  • the temperature sensor Due to the contact of the temperature sensor with the condensate collected in the condensate collecting basin, the temperature sensor can advantageously be freed from contamination, in particular lint, in order to permanently ensure the most accurate possible detection of the temperature of the process air used for drying the laundry. This makes optimal control of controlled variables of the operation of the household appliance possible.
  • the domestic appliance may be a conventional condensing clothes dryer without a heat pump, in which the detected temperature of the process air used for drying the laundry is used to control the heating power of a heating unit of the laundry dryer.
  • the domestic appliance may be a clothes dryer with an unregulated heat pump, wherein the sensed temperature of the process air used to dry the laundry is used to control a required auxiliary fan of the clothes dryer.
  • the household be a clothes dryer with a variable heat pump, in which the detected temperature of the process air used to dry the laundry is used to control the speed of the compressor of the heat pump.
  • the household appliance may be a washer-dryer or the like.
  • the electronic control and / or regulating unit is adapted to determine from the temperature signals of the temperature sensor, a degree of temperature change to compare the respective determined extent of the temperature change with a predetermined change threshold and to generate a warning signal and output, if the respective determined extent of the temperature change reaches the predetermined change limit.
  • the determination of whether an instantaneous liquid level in the condensate collecting basin will reach or have reached the predetermined filling level does not take into account the absolute values of the temperature signals, but the extent of the respectively detected temperature change ⁇ T / ⁇ t, where T is the temperature and t is the time.
  • the change limit value is predetermined in such a way that, when it is reached, it is clear that the temperature sensor is in contact with condensate collected in the condensate collecting basin or that the liquid level in the condensate collecting basin will reach or have reached the predetermined filling level.
  • the warning signal can be further processed as described above.
  • the electronic control and / or regulating unit is set up to compare the instantaneous temperature signal of the temperature sensor with a predetermined temperature limit value and to generate and output a warning signal when the instantaneous temperature signal falls below the predetermined temperature limit value. After that, to determine whether an instantaneous liquid level in the condensate collecting basin will reach or has reached the predetermined filling level, the following absolute values are taken into account from the temperature signals. This may be provided as an alternative or in addition to the last-mentioned embodiment.
  • the temperature limit value is predetermined in such a way that, when falling below it, it is clear that the temperature sensor is in contact with condensate collected in the condensate collecting basin or that the liquid level in the condensate collecting basin will reach or have reached the predetermined filling level.
  • the warning signal can be further processed as described above become.
  • the predetermined time can be chosen such that the comparison of the instantaneous temperature signal of the temperature sensor with the predetermined temperature limit only after a certain period of time after the start of a work, such as a drying process or a self-cleaning process occurs.
  • the temperature sensor is set up and arranged to detect a temperature of a process air used for drying the laundry, which flows out of a laundry drum in which the laundry is located.
  • process air has a significantly reduced temperature compared to the temperature with which it enters the laundry drum. She soon enters a heat sink, where it is further cooled, so that the moisture absorbed from the laundry by condensation separates out of it and is collected in the condensate collection basin.
  • the resulting temperature difference between the process air and the precipitated condensate is sufficient according to the invention to use the desired dual function of the temperature sensor. It should be added that in this context, a spatial proximity between the temperature sensor and the condensate collecting basin results quasi by itself, which is favorable for a placement of the temperature sensor in the condensate collecting basin.
  • the temperature sensor is also used to detect a temperature of a process air used for drying the laundry.
  • the method according to the invention is associated with the advantages mentioned above with reference to the household appliance.
  • the method according to the invention can be carried out using a single temperature sensor, which is associated with a cost saving compared with a use of a plurality of temperature sensors.
  • An advantageous embodiment provides that an extent of a temperature change from temperature signals of the temperature sensor is determined, the respective determined extent of the temperature change is compared with a predetermined change limit and a warning signal is generated and output when the respective determined extent of the temperature change reaches the predetermined change threshold.
  • an instantaneous temperature signal of the temperature sensor is compared with a predetermined temperature limit and a warning signal is generated and output when the current temperature signal falls below the predetermined temperature limit.
  • Fig. 1 shows a schematic representation of an embodiment of a household appliance 1 for drying laundry.
  • the household appliance 1 comprises a laundry drum 2, which is part of a fluid circuit 3 of the household appliance 1.
  • a heat pump with an evaporator 4 and a condenser 5 connected downstream of this is arranged.
  • a condensate collecting basin 6 is arranged below the heat pump, in particular its evaporator 4, a condensate collecting basin 6 is arranged.
  • a fan 7 is further arranged, with which a process air contained in the fluid circuit 3 can be circulated according to the arrows 8 within the fluid circuit 3.
  • the household appliance 1 further comprises a temperature sensor 9 arranged in the fluid circuit 3 for detecting a temperature of the process air used for drying the laundry, emerging from the laundry drum 8, and for generating corresponding temperature signals.
  • the temperature sensor 9 is arranged at least partially below a predetermined filling level 10 of the condensate collecting basin 6.
  • the domestic appliance 1 further includes a communication technology via a unidirectional communication link 11 connected to the temperature sensor 9 electronic control and / or regulating unit 12.
  • the electronic control and / or regulating unit 12 is adapted to determine from the temperature signals of the temperature sensor 9, whether a momentary Liquid level in the condensate collecting basin 6 will reach the predetermined level 10 or has reached.
  • the electronic control and / or control unit 12 to determine from the temperature signals of the temperature sensor 9, a degree of temperature change to compare the respective determined extent of the temperature change with a predetermined change threshold and to generate and output a warning signal when the respective determined extent of the temperature change the predetermined Change limit reached.
  • the electronic control and / or regulating unit 12 may be configured to compare the instantaneous temperature signal of the temperature sensor 9 with a predetermined temperature limit value and to generate and output a warning signal if the instantaneous temperature signal falls below the predetermined temperature limit value.
  • Fig. 2 shows a diagram of an exemplary temperature profile upon contact of a temperature sensor with condensate collected in the condensate collecting basin.
  • the temperature T detected by the temperature sensor is plotted against the time t. Initially, the temperature sensor is not in contact with condensate contained in the condensate collecting basin, so that only the temperature T P of the process air used for drying the laundry and exiting from the laundry drum is detected by the temperature sensor. From the time t K , the temperature sensor comes into contact with rising in the condensate collecting basin condensate, whereby the temperature sensor is cooled. As a result, the temperature detected by the temperature sensor begins to fall until the temperature detected by the temperature sensor corresponds to the temperature T K of the condensate contained in the condensate collecting basin.
  • the indicated by the straight line G negative slope of the temperature curve or the extent of the temperature change .DELTA.T / .DELTA.t after contact between the temperature sensor and existing in the condensate collecting condensate is determined by the electronic control and / or regulating unit and compared with a predetermined change limit.
  • the electronic control and / or regulating unit can generate and output a warning signal when the respectively determined extent of the temperature change reaches the predetermined change limit value.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Description

Die Erfindung betrifft ein Haushaltsgerät zum Trocknen von Wäsche, aufweisend wenigstens ein Kondensatauffangbecken, wenigstens einen Temperatursensor, der zumindest teilweise unterhalb einer vorgegebenen Füllhöhe des Kondensatauffangbeckens angeordnet ist, und wenigstens eine kommunikationstechnisch mit dem Temperatursensor verbundene elektronische Steuer- und/oder Regeleinheit, wobei die elektronische Steuer- und/oder Regeleinheit eingerichtet ist, aus den Temperatursignalen des Temperatursensors zu ermitteln, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat.The invention relates to a domestic appliance for drying laundry, comprising at least one condensate collecting basin, at least one temperature sensor which is arranged at least partially below a predetermined filling level of the condensate collecting basin, and at least one electronic control and / or regulating unit connected in terms of communication technology with the temperature sensor Control and / or regulating unit is arranged to determine from the temperature signals of the temperature sensor, whether an instantaneous liquid level in the condensate collecting basin will reach or has reached the predetermined level.

Des Weiteren betrifft die Erfindung ein Verfahren zum Überwachen eines Flüssigkeitsfüllstands in einem Kondensatauffangbecken eines Haushaltsgeräts zum Trocknen von Wäsche mittels wenigstens eines Temperatursensors, der zumindest teilweise unterhalb einer vorgegebenen Füllhöhe des Kondensatauffangbeckens angeordnet ist, wobei aus den Temperatursignalen des Temperatursensors ermittelt wird, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat.Furthermore, the invention relates to a method for monitoring a liquid level in a condensate collecting basin of a household appliance for drying laundry by means of at least one temperature sensor which is at least partially disposed below a predetermined filling level of the condensate collecting basin, wherein it is determined from the temperature signals of the temperature sensor, whether an instantaneous liquid level in the condensate collecting basin, the predetermined filling level will reach or has reached.

Ein solches Haushaltsgerät und ein solches Verfahren gehen hervor aus dem Dokument EP 2415927 A2 .Such a household appliance and such a method will be apparent from the document EP 2415927 A2 ,

Aus der KR 10-2013-0017212 A geht ein Waschtrockner hervor. Bei einem in diesem Waschtrockner ablaufenden Trocknungsprozess wird feuchtwarme Prozessluft durch zugeführtes Kühlwasser gekühlt und entfeuchtet. Das Kühlwasser wird in einem Laugenbehälter des Waschtrockners aufgefangen. Dort ist ein Temperatursensor vorgesehen, welcher zusätzlich zur Messung einer Temperatur der Prozessluft zu einer Messung der Füllhöhe des Kühlwassers im Laugenbehälter genutzt wird. Abhängig von Messsignalen dieses Sensors wird Kühlwasser aus dem Laugenbehälter abgepumpt. Aus der JP 2008-73089 A geht eine Wäschetrockenmaschine hervor, welche eine Wärmepumpe aufweist. Darin dient ein eigenbeheizter Temperatursensor zum Bestimmen eines Füllstandes in einem Sammelbehälter für Kondensat.From the KR 10-2013-0017212 A goes out a washer-dryer. In a drying process running in this washer-dryer, moist, warm process air is cooled and dehumidified by supplied cooling water. The cooling water is collected in a tub of the washer dryer. There, a temperature sensor is provided which is used in addition to measuring a temperature of the process air to a measurement of the filling level of the cooling water in the tub. Depending on the measuring signals of this sensor, cooling water is pumped out of the tub. From the JP 2008-73089 A goes out a laundry drying machine, which has a heat pump. This is a self-heated temperature sensor for determining a level in a reservoir for condensate.

Mit einem Kondensationswäschetrockner wird Wäsche unter Verwendung von Kondensationstrocknung getrocknet. Hierbei nimmt eine aufgeheizte Prozessluft, die durch eine die zu trocknende Wäsche enthaltende Kammer, beispielsweise eine Wäschetrommel, geleitet wird, Feuchtigkeit auf. Diese Feuchtigkeit wird anschließend an einem Wärmetauscher des Wäschetrockners aus der zum Trocknen der Wäsche verwendeten Prozessluft auskondensiert. Das hierdurch aus der zum Trocknen der Wäsche verwendeten Prozessluft auskondensierte Wasser wird in einem Kondensatauffangbecken des Wäschetrockners aufgefangen.With a condensation clothes dryer, laundry is dried using condensation drying. In this case, a heated process air, which is passed through a chamber containing the laundry to be dried, for example a laundry drum, absorbs moisture. This moisture is then condensed out of the process air used for drying the laundry at a heat exchanger of the tumble dryer. The water thus condensed out of the process air used for drying the laundry is collected in a condensate collecting basin of the tumble dryer.

Der Flüssigkeitsfüllstand innerhalb des Kondensatauffangbeckens muss überwacht werden, um ein Überlaufen des Kondensatauffangbeckens, beispielsweise bei Vorliegen einer Verstopfung eines Ablaufs des Kondensatauffangbeckens, verhindern zu können. Hierzu kann ein Elektrodenpaar an dem Kondensatauffangbecken angeordnet werden, das ab einem vorgegebenen Flüssigkeitsfüllstand in dem Kondensatauffangbecken mit dem in dem Kondensatauffangbecken enthaltenen Wasser in Kontakt kommt. Hierdurch wird über das Elektrodenpaar ein elektrischer Kurzschluss erzeugt, der von einer Elektronik des Wäschetrockners ausgewertet werden kann. Alternativ kann zur Überwachung des Flüssigkeitsfüllstands in dem Kondensatauffangbecken ein Schwimmerschalter eingesetzt werden, der beispielsweise Reed-Kontakte aufweisen kann, die über einen im Schwimmerschalter befindlichen Magneten geschlossen werden können, wodurch ebenfalls ein von der Elektronik des Wäschetrockners auswertbarer elektrischer Kurzschluss darstellbar ist.The liquid level within the condensate catch basin must be monitored in order to prevent overflow of the condensate catch basin, for example in the presence of clogging of a drain of the condensate catch basin. For this purpose, a pair of electrodes can be arranged on the condensate collecting basin, which comes into contact with the water contained in the condensate collecting basin from a predetermined liquid level in the condensate collecting basin. As a result, an electrical short circuit is generated via the electrode pair, which can be evaluated by an electronics of the tumble dryer. Alternatively, a float switch can be used to monitor the liquid level in the condensate collection basin, which can have, for example, reed contacts which can be closed via a magnet located in the float switch, whereby also an evaluable by the electronics of the tumble electric short circuit can be displayed.

In einem konventionellen Wäschetrockner kann die Temperatur der zum Trocknen der Wäsche verwendeten Prozessluft überwacht werden, um Regelgrößen des Betriebs des konventionellen Wäschetrockners, wie beispielsweise dessen regelbare Heizleistung, optimieren zu können. Zur Überwachung der Temperatur der zum Trocknen von Wäsche verwendeten Prozessluft kann ein Temperatursensor in einem Luftweg angeordnet werden, der an einem Lagerschild des konventionellen Wäschetrockners vorhanden ist. Die Überwachung der Temperatur der zum Trocknen verwendeten Prozessluft ist abhängig vom Verflusungszustand des Temperatursensors, da im Betrieb des Wäschetrockners auftretende feuchte Flusenablagerungen an dem Temperatursensor zu einer fehlerhaften Temperaturmessung führen können.In a conventional tumble dryer, the temperature of the process air used to dry the laundry can be monitored in order to optimize controlled variables of the operation of the conventional tumble dryer, such as its controllable heating capacity. For monitoring the temperature of the process air used for drying laundry, a temperature sensor can be arranged in an air path which is present on a bearing plate of the conventional tumble dryer. The monitoring of the temperature of the process air used for drying is dependent on the leaching state of the temperature sensor, since occurring during operation of the clothes dryer moist lint deposits on the temperature sensor can lead to a faulty temperature measurement.

Die EP 2 415 927 A2 betrifft einen Wäschetrockner mit einer Wärmepumpe, einem unterhalb eines Verdampfers der Wärmepumpe angeordneten Kondensatauffangbecken und einer Temperaturmesseinheit, die unterhalb einer vorgegebenen Füllhöhe des Kondensatauffangbeckens angeordnet ist, ab deren Erreichen das Kondensatauffangbecken überlaufen würde. Mit der Temperaturmesseinheit wird eine Temperatur eines von einem Kompressor der Wärmepumpe ausgehenden Kältemittels überwacht, wobei diese Temperatur die maximale Temperatur des Kältemittels innerhalb der Wärmepumpe ist und gewöhnlich zwischen 80°C und 100 °C liegt. Befindet sich Wasser in dem Kondensatauffangbecken, welches normalerweise eine Temperatur um 20°C hat, wird dadurch die von der Temperaturmesseinheit gemessene Temperatur deutlich verringert. Fällt die von der Temperaturmesseinheit gemessene Temperatur unter einen vorgegebenen Temperaturgrenzwert, wird hieraus auf das Vorliegen eines maximalen Flüssigkeitsfüllstands in dem Kondensatauffangbecken geschlossen und ein entsprechendes Signal erzeugt.The EP 2 415 927 A2 relates to a clothes dryer with a heat pump, a condensate collecting basin arranged below an evaporator of the heat pump and a temperature measuring unit, which is arranged below a predetermined filling level of the condensate collecting basin, from which the condensate collecting basin would overflow. With the temperature measuring unit, a temperature of a refrigerant discharged from a compressor of the heat pump is monitored, which temperature is the maximum temperature of the refrigerant within the heat pump, and is usually between 80 ° C and 100 ° C. If there is water in the condensate collecting basin, which normally has a temperature of around 20 ° C, the the temperature measuring unit measured temperature significantly reduced. If the temperature measured by the temperature measuring unit falls below a predetermined temperature limit value, it is concluded from this that there is a maximum liquid level in the condensate collecting basin and a corresponding signal is generated.

Aufgabe der Erfindung ist es, eine Überwachung der Temperatur einer zum Trocknen von Wäsche in einem Haushaltsgerät zum Trocknen von Wäsche verwendeten Prozessluft und eine Überwachung des Flüssigkeitsfüllstands innerhalb eines Kondensatauffangbeckens des Haushaltsgeräts zuverlässig und kostengünstig zu ermöglichen.The object of the invention is to enable reliable and cost-effective monitoring of the temperature of a process air used for drying laundry in a domestic appliance for drying laundry and monitoring of the liquid level within a condensate collecting basin of the domestic appliance.

Diese Aufgabe wird durch die Gegenstände der unabhängigen Patentansprüche gelöst. Vorteilhafte Ausgestaltungen sind insbesondere in den abhängigen Patentansprüchen wiedergegeben, welche jeweils für sich genommen oder in verschiedenen Kombinationen miteinander Aspekte und Weiterbildungen der Erfindung darstellen können.This object is solved by the subject matters of the independent claims. Advantageous embodiments are given in particular in the dependent claims, which in themselves or in various combinations with each other aspects and developments of the invention can represent.

Das erfindungsgemäße Haushaltsgerät zum Trocknen von Wäsche, aufweisend wenigstens ein Kondensatauffangbecken, wenigstens einen Temperatursensor, der zumindest teilweise unterhalb einer vorgegebenen Füllhöhe des Kondensatauffangbeckens angeordnet ist, und wenigstens eine kommunikationstechnisch mit dem Temperatursensor verbundene elektronische Steuer- und/oder Regeleinheit, wobei die elektronische Steuer- und/oder Regeleinheit eingerichtet ist, aus den Temperatursignalen des Temperatursensors zu ermitteln, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat, zeichnet sich insbesondere dadurch aus, dass der Temperatursensor eingerichtet und angeordnet ist, eine Temperatur einer zum Trocknen der Wäsche verwendeten Prozessluft zu erfassen und entsprechende Temperatursignale zu erzeugen.The household appliance according to the invention for drying laundry, comprising at least one condensate collecting basin, at least one temperature sensor, which is arranged at least partially below a predetermined filling level of the condensate collecting basin, and at least one electronic control and / or regulating unit communicatively connected to the temperature sensor, wherein the electronic control unit and / or control unit is arranged to determine from the temperature signals of the temperature sensor, whether an instantaneous liquid level in the condensate collecting basin will reach or has reached the predetermined level, is characterized in particular by the fact that the temperature sensor is set up and arranged, a temperature of drying To detect the laundry used process air and to generate corresponding temperature signals.

Erfindungsgemäß kann ein einziger Temperatursensor sowohl zum Überwachen der Temperatur der zum Trocknen von Wäsche in dem Haushaltsgerät verwendeten Prozessluft als auch zum Überwachen des Flüssigkeitsfüllstands innerhalb des Kondensatauffangbeckens des Haushaltsgeräts verwendet werden. Dies ist gegenüber einer Verwendung von jeweils einem Temperatursensor zum Überwachen der Temperatur einer zum Trocknen von Wäsche in einem Wäschetrockner verwendeten Prozessluft einerseits und zum Überwachen eines Flüssigkeitsfüllstands innerhalb eines Kondensatauffangbeckens des Wäschetrockners andererseits mit einer Bauteileinsparung und daraus hervorgehenden Kostenvorteilen verbunden. Die genannten Überwachungen können im Rahmen der Erfindung kontinuierlich oder in zeitlich beabstandeten Überwachungsschritten erfolgen.According to the invention, a single temperature sensor can be used both for monitoring the temperature of the process air used for drying laundry in the domestic appliance and for monitoring the liquid level within the condensate collecting basin of the household appliance. This is in contrast to a use of one temperature sensor each for monitoring the temperature of a process air used for drying laundry in a tumble dryer on the one hand and for monitoring a liquid level within a condensate collecting basin the tumble dryer on the other hand connected with a component savings and resulting cost advantages. Within the scope of the invention, said monitoring can be carried out continuously or in time-spaced monitoring steps.

Die mit EP 2 415 927 A2 vorgeschlagene Lehre ist gegenüber der vorliegenden Erfindung allein bei Kondensationstrocknern mit Wärmepumpen einsetzbar. Es erfolgt eine reguläre Überwachung einer besonders hohen Temperatur in der Wärmepumpe, nämlich der Temperatur des den Kompressor verlassenden Kältemittels, welche dessen maximale Temperatur ist. Demgegenüber ist die vorliegende Erfindung vielseitiger einsetzbar, insbesondere auch bei einem Kondensationstrockner ohne Wärmepumpe. Dazu geht die Erfindung aus von der Erkenntnis, dass auch die Temperaturen der Prozessluft und des aus dieser abgeschiedenen Kondensats ausreichend verschieden voneinander sind, um eine doppelte Verwendung des Temperatursensors im Sinne der Erfindung zu ermöglichen.With EP 2 415 927 A2 proposed teaching is compared to the present invention alone in condensation dryers with heat pumps used. There is a regular monitoring of a particularly high temperature in the heat pump, namely the temperature of the compressor leaving the refrigerant, which is the maximum temperature. In contrast, the present invention is more versatile, especially in a condensation dryer without heat pump. For this purpose, the invention is based on the finding that the temperatures of the process air and of the condensate deposited therefrom are also sufficiently different from one another in order to permit a double use of the temperature sensor in the sense of the invention.

Befindet sich kein oder wenig Kondensat in dem Kondensatauffangbecken bzw. kommt der Temperatursensor nicht in Kontakt mit dem in dem Kondensatauffangbecken aufgefangenen Kondensat, kann der Temperatursensor die Temperatur der zum Trocknen der Wäsche verwendeten Prozessluft erfassen und entsprechende Temperatursignale erzeugen, die über eine kabellose oder kabelgebundene Kommunikationsverbindung an die elektronische Steuer- und/oder Regeleinheit weitergeleitet werden, welche die Überwachung des Flüssigkeitsfüllstands in dem Kondensatauffangbecken durchführt. Steigt der Flüssigkeitsfüllstand in dem Kondensatauffangbecken derart an, dass der Temperatursensor teilweise oder vollständig in das in dem Kondensatauffangbecken vorhandene Kondensat eintaucht, ist mittels des Temperatursensors ein Temperaturabfall erfassbar, da die Temperatur des in dem Kondensatauffangbecken aufgefangenen Kondensats niedriger ist als die Temperatur der zum Trocknen der Wäsche verwendeten Prozessluft. Aus diesem Einfluss des Kontakts des Temperatursensors mit dem in dem Kondensatauffangbecken enthaltenen Kondensats kann die elektronische Steuer- und/oder Regeleinrichtung darauf rückschließen, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat. Wird bzw. ist die vorgegebene Füllhöhe erreicht, kann die elektronische Steuer- und/oder Regeleinheit ein entsprechendes elektrisches Warnsignal erzeugen und ausgeben. Das elektrische Warnsignal kann zur weiteren Steuerung des Haushaltsgeräts verwendet werden. Beispielsweise kann das Haushaltsgerät bei Vorliegen des elektrischen Warnsignals gestoppt bzw. abgeschaltet werden. Alternativ oder additiv kann das elektrische Warnsignal für einen Nutzer des Haushaltsgeräts akustisch und/oder optisch erfassbar gemacht werden.If there is no or little condensate in the condensate collecting basin or if the temperature sensor does not come into contact with the condensate collected in the condensate collecting basin, the temperature sensor can detect the temperature of the process air used for drying the laundry and generate corresponding temperature signals which are transmitted via a wireless or wired communication connection be forwarded to the electronic control and / or regulating unit, which performs the monitoring of the liquid level in the condensate collection basin. If the liquid level in the condensate collecting basin increases in such a way that the temperature sensor dips partially or completely into the condensate present in the condensate collecting basin, a temperature drop can be detected by means of the temperature sensor, since the temperature of the condensate collected in the condensate collecting basin is lower than the temperature for drying the Laundry used process air. From this influence of the contact of the temperature sensor with the condensate contained in the condensate collecting basin, the electronic control and / or regulating device can infer whether an instantaneous liquid level in the condensate collecting basin will reach or have reached the predetermined filling level. If the predetermined level is reached, the electronic control and / or regulating unit can generate and output a corresponding electrical warning signal. The electrical warning signal can be used to further control the household appliance. For example, the household appliance can be stopped or switched off in the presence of the electrical warning signal. Alternatively or additionally, the electrical warning signal for a user of the household appliance can be made acoustically and / or optically detectable.

Bei der vorgegebenen Füllhöhe kann es sich um eine maximale Füllhöhe des Kondensatauffangbeckens handeln, ab deren Erreichen das Kondensatauffangbecken überlaufen würde. Alternativ kann die vorgegebene Füllhöhe unterhalb der maximalen Füllhöhe liegen, um eine Auffangreserve zur Verfügung zu stellen, bevor das Kondensatauffangbecken überläuft.The specified fill level may be a maximum fill level of the condensate catch basin, from which point the condensate catch basin would overflow. Alternatively, the predetermined fill level may be below the maximum fill level to provide a catch reserve before the condensate catch basin overflows.

Die elektronische Steuer- und/oder Regeleinheit kann einen Mikrocontroller und eine geeignete Auswertungssoftware aufweisen. Die elektronische Steuer- und/oder Regeleinheit kann in eine übliche Elektronik des Haushaltegeräts integriert oder separat von der üblichen Elektronik angeordnet und kommunikationstechnisch mit der üblichen Elektronik verbunden sein.The electronic control and / or regulating unit may have a microcontroller and suitable evaluation software. The electronic control and / or regulating unit can be integrated in a conventional electronics of the household appliance or arranged separately from the usual electronics and communication technology connected to the usual electronics.

Durch den Kontakt des Temperatursensors mit dem in dem Kondensatauffangbecken aufgefangenen Kondensat kann der Temperatursensor vorteilhaft von Verschmutzungen, insbesondere Flusen, befreit werden, um dauerhaft eine möglichst genaue Erfassung der Temperatur der zum Trocknen der Wäsche verwendeten Prozessluft zu gewährleisten. Dies macht eine optimale Regelung von Regelgrößen des Betriebs des Haushaltsgeräts möglich.Due to the contact of the temperature sensor with the condensate collected in the condensate collecting basin, the temperature sensor can advantageously be freed from contamination, in particular lint, in order to permanently ensure the most accurate possible detection of the temperature of the process air used for drying the laundry. This makes optimal control of controlled variables of the operation of the household appliance possible.

Das Haushaltsgerät kann ein konventioneller Kondensationswäschetrockner ohne Wärmepumpe sein, bei dem die erfasste Temperatur der zum Trocknen der Wäsche verwendeten Prozessluft zum Regeln der Heizleistung eines Heizaggregats des Wäschetrockners verwendet wird. Alternativ kann das Haushaltsgerät ein Wäschetrockner mit einer ungeregelten Wärmepumpe sein, bei dem die erfasste Temperatur der zum Trocknen der Wäsche verwendeten Prozessluft zum Regeln eines erforderlichen Zusatzlüfters des Wäschetrockners verwendet wird. Weiter alternativ kann das Haushalts gerät ein Wäschetrockner mit einer regelbaren Wärmepumpe sein, bei dem die erfasste Temperatur der zum Trocknen der Wäsche verwendeten Prozessluft zur Regelung der Drehzahl des Kompressors der Wärmepumpe verwendet wird. Des Weiteren kann das Haushaltsgerät ein Waschtrockner oder dergleichen sein.The domestic appliance may be a conventional condensing clothes dryer without a heat pump, in which the detected temperature of the process air used for drying the laundry is used to control the heating power of a heating unit of the laundry dryer. Alternatively, the domestic appliance may be a clothes dryer with an unregulated heat pump, wherein the sensed temperature of the process air used to dry the laundry is used to control a required auxiliary fan of the clothes dryer. Next alternatively, the household be a clothes dryer with a variable heat pump, in which the detected temperature of the process air used to dry the laundry is used to control the speed of the compressor of the heat pump. Furthermore, the household appliance may be a washer-dryer or the like.

Gemäß einer vorteilhaften Ausgestaltung ist die elektronische Steuer- und/oder Regeleinheit eingerichtet, aus den Temperatursignalen des Temperatursensors ein Ausmaß einer Temperaturänderung zu ermitteln, das jeweilig ermittelte Ausmaß der Temperaturänderung mit einem vorgegebenen Änderungsgrenzwert zu vergleichen und ein Warnsignal zu erzeugen und auszugeben, wenn das jeweilig ermittelte Ausmaß der Temperaturänderung den vorgegebenen Änderungsgrenzwert erreicht. Hiernach werden zur Ermittlung, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat, nicht aus den Temperatursignalen folgende Absolutwerte berücksichtigt, sondern das Ausmaß der jeweilig erfassten Temperaturänderung ΔT/Δt, wobei T die Temperatur und t die Zeit ist. Der Änderungsgrenzwert ist derart vorgegeben, dass es bei seinem Erreichen eindeutig ist, dass der Temperatursensor in Kontakt mit in dem Kondensatauffangbecken aufgefangenem Kondensat steht bzw. dass der Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat. Das Warnsignal kann wie oben beschrieben weiterverarbeitet werden.According to an advantageous embodiment, the electronic control and / or regulating unit is adapted to determine from the temperature signals of the temperature sensor, a degree of temperature change to compare the respective determined extent of the temperature change with a predetermined change threshold and to generate a warning signal and output, if the respective determined extent of the temperature change reaches the predetermined change limit. Hereinafter, the determination of whether an instantaneous liquid level in the condensate collecting basin will reach or have reached the predetermined filling level does not take into account the absolute values of the temperature signals, but the extent of the respectively detected temperature change ΔT / Δt, where T is the temperature and t is the time. The change limit value is predetermined in such a way that, when it is reached, it is clear that the temperature sensor is in contact with condensate collected in the condensate collecting basin or that the liquid level in the condensate collecting basin will reach or have reached the predetermined filling level. The warning signal can be further processed as described above.

Nach einer weiteren vorteilhaften Ausgestaltung ist die elektronische Steuer- und/oder Regeleinheit eingerichtet, zu einem vorgegebenen Zeitpunkt das momentane Temperatursignal des Temperatursensors mit einem vorgegebenen Temperaturgrenzwert zu vergleichen und ein Warnsignal zu erzeugen und auszugeben, wenn das momentane Temperatursignal den vorgegebenen Temperaturgrenzwert unterschreitet. Hiernach werden zur Ermittlung, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat, aus den Temperatursignalen folgende Absolutwerte berücksichtigt. Dies kann alternativ oder additiv zu der zuletzt genannten Ausgestaltung vorgesehen sein. Der Temperaturgrenzwert ist derart vorgegeben, dass es bei seinem Unterschreiten eindeutig ist, dass der Temperatursensor in Kontakt mit in dem Kondensatauffangbecken aufgefangenem Kondensat steht bzw. dass der Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat. Das Warnsignal kann wie oben beschrieben weiterverarbeitet werden. Der vorgegebene Zeitpunkt kann derart gewählt werden, dass der Vergleich des momentanen Temperatursignals des Temperatursensors mit dem vorgegebenen Temperaturgrenzwert erst nach einem bestimmten Zeitraum nach Beginn eines Arbeitsvorgangs, beispielsweise eines Trocknungsvorgangs oder eines Selbstreinigungsvorgangs, erfolgt.According to a further advantageous embodiment, the electronic control and / or regulating unit is set up to compare the instantaneous temperature signal of the temperature sensor with a predetermined temperature limit value and to generate and output a warning signal when the instantaneous temperature signal falls below the predetermined temperature limit value. After that, to determine whether an instantaneous liquid level in the condensate collecting basin will reach or has reached the predetermined filling level, the following absolute values are taken into account from the temperature signals. This may be provided as an alternative or in addition to the last-mentioned embodiment. The temperature limit value is predetermined in such a way that, when falling below it, it is clear that the temperature sensor is in contact with condensate collected in the condensate collecting basin or that the liquid level in the condensate collecting basin will reach or have reached the predetermined filling level. The warning signal can be further processed as described above become. The predetermined time can be chosen such that the comparison of the instantaneous temperature signal of the temperature sensor with the predetermined temperature limit only after a certain period of time after the start of a work, such as a drying process or a self-cleaning process occurs.

Nach noch einer weiteren bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass der Temperatursensor eingerichtet und angeordnet ist, eine Temperatur einer zum Trocknen der Wäsche verwendeten Prozessluft zu erfassen, welche einer Wäschetrommel, in welcher sich die Wäsche befindet, entströmt. Solche Prozessluft hat eine gegenüber der Temperatur, mit welcher sie in die Wäschetrommel eintritt, deutlich reduzierte Temperatur. Sie gelangt alsbald in eine Wärmesenke, wo sie weiter abgekühlt wird, damit sich die aus der Wäsche aufgenommene Feuchtigkeit durch Kondensation aus ihr ausscheidet und in dem Kondensatauffangbecken gesammelt wird. Die sich dabei ergebende Temperaturdifferenz zwischen der Prozessluft und dem ausgefallenen Kondensat reicht erfindungsgemäß aus, um die gewünschte Doppelfunktion des Temperatursensors zu nutzen. Es kommt hinzu, dass sich in diesem Zusammenhang eine räumliche Nähe zwischen dem Temperatursensor und dem Kondensatauffangbecken quasi von selbst ergibt, welche für eine Platzierung des Temperatursensors in dem Kondensatauffangbecken günstig ist.According to yet another preferred embodiment of the invention, it is provided that the temperature sensor is set up and arranged to detect a temperature of a process air used for drying the laundry, which flows out of a laundry drum in which the laundry is located. Such process air has a significantly reduced temperature compared to the temperature with which it enters the laundry drum. She soon enters a heat sink, where it is further cooled, so that the moisture absorbed from the laundry by condensation separates out of it and is collected in the condensate collection basin. The resulting temperature difference between the process air and the precipitated condensate is sufficient according to the invention to use the desired dual function of the temperature sensor. It should be added that in this context, a spatial proximity between the temperature sensor and the condensate collecting basin results quasi by itself, which is favorable for a placement of the temperature sensor in the condensate collecting basin.

Nach dem erfindungsgemäßen Verfahren zum Überwachen eines Flüssigkeitsfüllstands in einem Kondensatauffangbecken eines Haushaltsgeräts zum Trocknen von Wäsche mittels wenigstens eines Temperatursensors, der zumindest teilweise unterhalb einer vorgegebenen Füllhöhe des Kondensatauffangbeckens angeordnet ist, wobei aus den Temperatursignalen des Temperatursensors ermittelt wird, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken die vorgegebene Füllhöhe erreichen wird oder erreicht hat, wird der Temperatursensor zudem zum Erfassen einer Temperatur einer zum Trocknen der Wäsche verwendeten Prozessluft verwendet.According to the inventive method for monitoring a liquid level in a condensate collecting basin of a household appliance for drying laundry by means of at least one temperature sensor, which is at least partially disposed below a predetermined filling level of the condensate collecting basin, wherein it is determined from the temperature signals of the temperature sensor, whether an instantaneous liquid level in the condensate collecting basin When the predetermined level is reached or reached, the temperature sensor is also used to detect a temperature of a process air used for drying the laundry.

Das erfindungsgemäße Verfahren ist mit den oben mit Bezug auf das Haushaltsgerät genannten Vorteilen entsprechend verbunden. Insbesondere kann das erfindungsgemäße Verfahren unter Verwendung eines einzigen Temperatursensors durchgeführt werden, was mit einer Kostenersparnis gegenüber einer Verwendung mehrerer Temperatursensoren verbunden ist.The method according to the invention is associated with the advantages mentioned above with reference to the household appliance. In particular, the method according to the invention can be carried out using a single temperature sensor, which is associated with a cost saving compared with a use of a plurality of temperature sensors.

Eine vorteilhafte Ausgestaltung sieht vor, dass ein Ausmaß einer Temperaturänderung aus Temperatursignalen des Temperatursensors ermittelt wird, das jeweilig ermittelte Ausmaß der Temperaturänderung mit einem vorgegebenen Änderungsgrenzwert verglichen wird und ein Warnsignal erzeugt und ausgegeben wird, wenn das jeweilig ermittelte Ausmaß der Temperaturänderung den vorgegebenen Änderungsgrenzwert erreicht. Mit dieser Ausgestaltung des Verfahrens sind die oben mit Bezug auf die entsprechende Ausgestaltung des Haushaltsgeräts verbundenen Vorteile entsprechend verbunden.An advantageous embodiment provides that an extent of a temperature change from temperature signals of the temperature sensor is determined, the respective determined extent of the temperature change is compared with a predetermined change limit and a warning signal is generated and output when the respective determined extent of the temperature change reaches the predetermined change threshold. With this embodiment of the method, the advantages associated above with respect to the corresponding embodiment of the household appliance are connected accordingly.

Gemäß einer weiteren vorteilhaften Ausgestaltung ist vorgesehen, dass zu einem vorgegebenen Zeitpunkt ein momentanes Temperatursignal des Temperatursensors mit einem vorgegebenen Temperaturgrenzwert verglichen wird und ein Warnsignal erzeugt und ausgegeben wird, wenn das momentane Temperatursignal den vorgegebenen Temperaturgrenzwert unterschreitet. Mit dieser Ausgestaltung des Verfahrens sind die oben mit Bezug auf die entsprechende Ausgestaltung des Haushaltsgeräts verbundenen Vorteile entsprechend verbunden.According to a further advantageous embodiment, it is provided that at a given time, an instantaneous temperature signal of the temperature sensor is compared with a predetermined temperature limit and a warning signal is generated and output when the current temperature signal falls below the predetermined temperature limit. With this embodiment of the method, the advantages associated above with respect to the corresponding embodiment of the household appliance are connected accordingly.

Die Erfindung ist nicht auf die angegebene Kombination der Merkmale der unabhängigen Patentansprüche und der abhängigen Patentansprüche beschränkt. Es ergeben sich darüber hinaus weitere Möglichkeiten, einzelne Merkmale, insbesondere dann, wenn sie sich aus den Patentansprüchen, der nachfolgenden Beschreibung der Ausführungsbeispiele oder unmittelbar aus den Figuren ergeben, miteinander zu kombinieren. Außerdem soll die Bezugnahme der Patentansprüche auf die Figuren durch die Verwendung von Bezugszeichen den Schutzumfang der Patentansprüche auf keinen Fall auf die dargestellten Ausführungsbeispiele beschränken.The invention is not limited to the specified combination of the features of the independent claims and the dependent claims. In addition, there are further possibilities of combining individual features, in particular if they result from the patent claims, the following description of the exemplary embodiments or directly from the figures. In addition, the reference of the claims to the figures by the use of reference numerals is not intended to limit the scope of the claims to the illustrated embodiments.

Im Folgenden wird die Erfindung unter Bezugnahme auf die anliegenden Figuren anhand von bevorzugten Ausführungsbeispielen beispielhaft erläutert, wobei die nachfolgend dargestellten Merkmale sowohl jeweils für sich genommen als auch in unterschiedlicher Kombination miteinander einen Aspekt der Erfindung darstellen können. Es zeigen

Fig. 1
eine schematische Darstellung eines Ausführungsbeispiels für ein Haushaltsgerät und
Fig. 2
ein Diagramm eines beispielhaften Temperaturverlaufs bei Kontakt des Temperatursensors mit im Kondensatauffangbecken aufgefangenem Kondensat.
In the following, the invention will be explained by way of example with reference to the attached figures with reference to preferred exemplary embodiments, wherein the features illustrated below may represent an aspect of the invention both individually and in different combinations with one another. Show it
Fig. 1
a schematic representation of an embodiment of a household appliance and
Fig. 2
a diagram of an exemplary temperature profile upon contact of the temperature sensor with condensate collected in the condensate collecting basin.

Fig. 1 zeigt eine schematische Darstellung eines Ausführungsbeispiels für ein Haushaltsgerät 1 zum Trocknen von Wäsche. Das Haushaltsgerät 1 umfasst eine Wäschetrommel 2, die Teil eines Fluidkreislaufs 3 des Haushaltsgeräts 1 ist. In dem Fluidkreislauf 3 ist des Weiteren eine Wärmepumpe mit einem Evaporator 4 und einem diesem nachgeschalteten Kondensator 5 angeordnet. Unterhalb der Wärmepumpe, insbesondere deren Evaporator 4, ist ein Kondensatauffangbecken 6 angeordnet. In dem Fluidkreislauf 3 ist ferner ein Gebläse 7 angeordnet, mit dem eine in dem Fluidkreislauf 3 enthaltene Prozessluft entsprechend den Pfeilen 8 innerhalb des Fluidkreislaufs 3 zirkuliert werden kann. Fig. 1 shows a schematic representation of an embodiment of a household appliance 1 for drying laundry. The household appliance 1 comprises a laundry drum 2, which is part of a fluid circuit 3 of the household appliance 1. In the fluid circuit 3, furthermore, a heat pump with an evaporator 4 and a condenser 5 connected downstream of this is arranged. Below the heat pump, in particular its evaporator 4, a condensate collecting basin 6 is arranged. In the fluid circuit 3, a fan 7 is further arranged, with which a process air contained in the fluid circuit 3 can be circulated according to the arrows 8 within the fluid circuit 3.

Das Haushaltsgerät 1 umfasst des Weiteren einen in dem Fluidkreislauf 3 angeordneten Temperatursensor 9 zum Erfassen einer Temperatur der zum Trocknen der Wäsche verwendeten, aus der Wäschetrommel 8 austretenden Prozessluft und zum Erzeugen von entsprechenden Temperatursignalen. Der Temperatursensor 9 ist zumindest teilweise unterhalb einer vorgegebenen Füllhöhe 10 des Kondensatauffangbeckens 6 angeordnet.The household appliance 1 further comprises a temperature sensor 9 arranged in the fluid circuit 3 for detecting a temperature of the process air used for drying the laundry, emerging from the laundry drum 8, and for generating corresponding temperature signals. The temperature sensor 9 is arranged at least partially below a predetermined filling level 10 of the condensate collecting basin 6.

Das Haushaltsgerät 1 umfasst ferner eine kommunikationstechnisch über eine unidirektionale Kommunikationsverbindung 11 mit dem Temperatursensor 9 verbundene elektronischen Steuer- und/oder Regeleinheit 12. Die elektronische Steuer- und/oder Regeleinheit 12 ist eingerichtet, aus den Temperatursignalen des Temperatursensors 9 zu ermitteln, ob ein momentaner Flüssigkeitsfüllstand in dem Kondensatauffangbecken 6 die vorgegebene Füllhöhe 10 erreichen wird oder erreicht hat. Hierzu kann die elektronische Steuer- und/oder Regeleinheit 12 eingerichtet sein, aus den Temperatursignalen des Temperatursensors 9 ein Ausmaß einer Temperaturänderung zu ermitteln, das jeweilig ermittelte Ausmaß der Temperaturänderung mit einem vorgegebenen Änderungsgrenzwert zu vergleichen und ein Warnsignal zu erzeugen und auszugeben, wenn das jeweilig ermittelte Ausmaß der Temperaturänderung den vorgegebenen Änderungsgrenzwert erreicht.The domestic appliance 1 further includes a communication technology via a unidirectional communication link 11 connected to the temperature sensor 9 electronic control and / or regulating unit 12. The electronic control and / or regulating unit 12 is adapted to determine from the temperature signals of the temperature sensor 9, whether a momentary Liquid level in the condensate collecting basin 6 will reach the predetermined level 10 or has reached. For this purpose, the electronic control and / or control unit 12 to determine from the temperature signals of the temperature sensor 9, a degree of temperature change to compare the respective determined extent of the temperature change with a predetermined change threshold and to generate and output a warning signal when the respective determined extent of the temperature change the predetermined Change limit reached.

Alternativ oder additiv kann die elektronische Steuer- und/oder Regeleinheit 12 eingerichtet sein, zu einem vorgegebenen Zeitpunkt das momentane Temperatursignal des Temperatursensors 9 mit einem vorgegebenen Temperaturgrenzwert zu vergleichen und ein Warnsignal zu erzeugen und auszugeben, wenn das momentane Temperatursignal den vorgegebenen Temperaturgrenzwert unterschreitet.Alternatively or additionally, the electronic control and / or regulating unit 12 may be configured to compare the instantaneous temperature signal of the temperature sensor 9 with a predetermined temperature limit value and to generate and output a warning signal if the instantaneous temperature signal falls below the predetermined temperature limit value.

Fig. 2 zeigt ein Diagramm eines beispielhaften Temperaturverlaufs bei Kontakt eines Temperatursensors mit im Kondensatauffangbecken aufgefangenem Kondensat. Es ist die von dem Temperatursensor erfasste Temperatur T gegen die Zeit t aufgetragen. Zu Beginn ist der Temperatursensor nicht in Kontakt mit in dem Kondensatauffangbecken enthaltenem Kondensat, so dass von dem Temperatursensor allein die Temperatur TP der zum Trocknen der Wäsche verwendeten, aus der Wäschetrommel austretenden Prozessluft erfasst wird. Ab dem Zeitpunkt tK kommt der Temperatursensor in Kontakt mit in dem Kondensatauffangbecken steigendem Kondensat, wodurch der Temperatursensor abgekühlt wird. Hierdurch beginnt die von dem Temperatursensor erfasste Temperatur zu fallen, bis die von dem Temperatursensor erfasste Temperatur der Temperatur TK des in dem Kondensatauffangbecken enthaltenen Kondensats entspricht. Fig. 2 shows a diagram of an exemplary temperature profile upon contact of a temperature sensor with condensate collected in the condensate collecting basin. The temperature T detected by the temperature sensor is plotted against the time t. Initially, the temperature sensor is not in contact with condensate contained in the condensate collecting basin, so that only the temperature T P of the process air used for drying the laundry and exiting from the laundry drum is detected by the temperature sensor. From the time t K , the temperature sensor comes into contact with rising in the condensate collecting basin condensate, whereby the temperature sensor is cooled. As a result, the temperature detected by the temperature sensor begins to fall until the temperature detected by the temperature sensor corresponds to the temperature T K of the condensate contained in the condensate collecting basin.

Die durch die Gerade G angedeutete negative Steigung der Temperaturkurve bzw. das Ausmaß der Temperaturänderung ΔT/Δt nach dem Kontakt zwischen dem Temperatursensor und dem in dem Kondensatauffangbecken vorhandenen Kondensat wird von der elektronischen Steuer- und/oder Regeleinheit ermittelt und mit einem vorgegebenen Änderungsgrenzwert vergleichen. Die elektronische Steuer- und/oder Regeleinheit kann ein Warnsignal dann erzeugen und ausgeben, wenn das jeweilig ermittelte Ausmaß der Temperaturänderung den vorgegebenen Änderungsgrenzwert erreicht.The indicated by the straight line G negative slope of the temperature curve or the extent of the temperature change .DELTA.T / .DELTA.t after contact between the temperature sensor and existing in the condensate collecting condensate is determined by the electronic control and / or regulating unit and compared with a predetermined change limit. The electronic control and / or regulating unit can generate and output a warning signal when the respectively determined extent of the temperature change reaches the predetermined change limit value.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Haushaltsgeräthousehold appliance
22
Wäschetrommelwashing drum
33
FluidkreislaufFluid circuit
44
Evaporatorevaporator
55
Kondensatorcapacitor
66
Kondensatauffangbeckencondensate collecting basin
77
Gebläsefan
88th
Pfeilarrow
99
Temperatursensortemperature sensor
1010
vorgegebene Füllhöhepredetermined filling level
1111
Kommunikationsverbindungcommunication link
1212
Steuer- und/oder RegeleinheitControl and / or regulating unit
TP T P
ProzesslufttemperaturProcess air temperature
TK T K
Kondensattemperaturcondensate temperature
tK t K
KontaktzeitpunktContact time
GG
GeradeJust

Claims (7)

  1. Household appliance (1) for drying laundry, having
    - at least one condensate collecting tank (6),
    - at least one temperature sensor (9), which is arranged at least partially below a predetermined filling level (10) of the condensate collecting tank (6), and
    - at least one electronic control and/or regulating unit (12) connected for communication purposes with the temperature sensor (9),
    - wherein the electronic control and/or regulating unit (12) is designed to determine from the temperature signals of the temperature sensor (9) whether a current liquid fill level in the condensate collecting tank (6) will reach or has reached the predetermined filling level (10),
    characterised in that
    - the temperature sensor (9) is designed and arranged to detect a temperature (TP ) of process air used to dry the laundry and to generate corresponding temperature signals.
  2. Household appliance (1) according to claim 1, characterised in that the electronic control and/or regulating unit (12) is designed
    - to determine an amount of a temperature change from the temperature signals of the temperature sensor (9),
    - to compare the respectively determined amount of the temperature change with a predetermined change limit value, and
    - to generate and output a warning signal if the respectively determined amount of the temperature change reaches the predetermined change limit value.
  3. Household appliance (1) according to one of claims 1 and 2, characterised in that the electronic control and/or regulating unit (12) is designed
    - to compare the current temperature signal of the temperature sensor (9) with a predetermined temperature limit value at a predetermined point in time and
    - to generate and output a warning signal if the current temperature signal does not reach the predetermined temperature limit value.
  4. Household appliance according to one of the preceding claims, characterised in that the temperature sensor (9) is designed and arranged to detect a temperature (TP ) of process air used to dry the laundry, which flows out of a laundry drum (2) in which the laundry is located.
  5. Method for monitoring a liquid fill level in a condensate collecting tank (6) of a household appliance (1) for drying laundry
    - by means of at least one temperature sensor (9), which is arranged at least partially below a predetermined filling level (10) of the condensate collecting tank (6),
    - wherein it is determined from the temperature signals of the temperature sensor (9) whether a current liquid fill level in the condensate collecting tank (6) will reach or has reached the predetermined filling level (10),
    characterised in that the temperature sensor (9) is also used to detect a temperature (TP ) of process air used to dry the laundry.
  6. Method according to claim 4, characterised in that
    - an amount of a temperature change is determined from temperature signals of the temperature sensor (9),
    - the respectively determined amount of the temperature change is compared with a predetermined change limit value and
    - a warning signal is generated and output if the respectively determined amount of the temperature change reaches the predetermined change limit value.
  7. Method according to one of claims 5 and 6, characterised in that
    - a current temperature signal of the temperature sensor (9) is compared with a predetermined temperature limit value at a predetermined point in time and
    - a warning signal is generated and output if the current temperature signal does not reach the predetermined temperature limit value.
EP15183112.0A 2014-09-11 2015-08-31 Household appliance for drying laundry, comprising a temperature sensor Active EP2995715B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15183112T PL2995715T3 (en) 2014-09-11 2015-08-31 Household appliance for drying laundry, comprising a temperature sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014218253.0A DE102014218253A1 (en) 2014-09-11 2014-09-11 Household appliance for drying laundry, comprising a temperature sensor

Publications (2)

Publication Number Publication Date
EP2995715A1 EP2995715A1 (en) 2016-03-16
EP2995715B1 true EP2995715B1 (en) 2019-03-06

Family

ID=54014628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15183112.0A Active EP2995715B1 (en) 2014-09-11 2015-08-31 Household appliance for drying laundry, comprising a temperature sensor

Country Status (3)

Country Link
EP (1) EP2995715B1 (en)
DE (1) DE102014218253A1 (en)
PL (1) PL2995715T3 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4333901C2 (en) * 1993-10-05 1999-04-08 Bauknecht Hausgeraete Tumble dryer
JP2008073089A (en) * 2006-09-19 2008-04-03 Toshiba Corp Clothes dryer
DE102008006349A1 (en) * 2008-01-28 2009-07-30 BSH Bosch und Siemens Hausgeräte GmbH Condensation dryer with condensate pan and container and method for its operation
EP2415927B1 (en) 2010-08-06 2016-07-20 Panasonic Corporation Dehumidifying-warming apparatus and clothes drier
KR20130017212A (en) * 2011-08-10 2013-02-20 주식회사 대우일렉트로닉스 Apparatus for controlling drying in washing machine

Non-Patent Citations (1)

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

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Publication number Publication date
EP2995715A1 (en) 2016-03-16
PL2995715T3 (en) 2019-08-30
DE102014218253A1 (en) 2016-03-17

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