EP2035617B1 - Procédé pour détecter l'arrêt d'un tambour dans un séchoir à tambour et séchoir à tambour approprié à cet effet - Google Patents

Procédé pour détecter l'arrêt d'un tambour dans un séchoir à tambour et séchoir à tambour approprié à cet effet Download PDF

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Publication number
EP2035617B1
EP2035617B1 EP07729432.0A EP07729432A EP2035617B1 EP 2035617 B1 EP2035617 B1 EP 2035617B1 EP 07729432 A EP07729432 A EP 07729432A EP 2035617 B1 EP2035617 B1 EP 2035617B1
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EP
European Patent Office
Prior art keywords
drum
laundry
temperature
difference value
count value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07729432.0A
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German (de)
English (en)
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EP2035617A1 (fr
Inventor
Thomas Nawrot
Ulrich Nehring
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2035617A1 publication Critical patent/EP2035617A1/fr
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Publication of EP2035617B1 publication Critical patent/EP2035617B1/fr
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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
    • D06F58/32—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
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/20—Parameters relating to constructional components, e.g. door sensors
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F2103/24—Spin speed; Drum movements
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/28—Arrangements for program selection, e.g. control panels therefor; Arrangements for indicating program parameters, e.g. the selected program or its progress
    • 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
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the invention relates to a method for detecting the stoppage of a drum in a drum dryer and a drum dryer suitable for this purpose (hereinafter also referred to as "tumble dryer").
  • wet laundry located in a generally rotating drum is dried by passing a heated air stream through the drum and thus through the laundry, which is capable of removing moisture from the laundry, thereby gradually drying the laundry becomes.
  • the supplied air stream (process air stream) is heated in a supply line in front of the drum ("laundry drum") by means of a heater and after passing through the laundry in the drum either discharged to the outside (exhaust air dryer) or fed to a heat exchanger in which cooled the air flow and the moisture precipitates as condensate.
  • the warm process air removes the laundry depending on the degree of humidity and temperature of the laundry a corresponding amount of moisture. It is important that after reaching a certain degree of drying of the laundry excessive heating of the process air flow and thus both overheating of the laundry and overheating of the clothes dryer is avoided.
  • a particularly critical condition which can lead to damage of laundry and affect the reliability, is a stoppage of the laundry drum, which occurs for example when tearing a drive belt of the drum.
  • a cracked drive belt can be detected mechanically via a limit switch. However, this requires an additional component complexity with a corresponding control. Another possibility for detecting such a standstill or a broken drive belt is that the rotational movement of the drum is detected in particular by optoelectronic components. However, this solution also requires an additional component complexity with appropriate electronic control.
  • WO 2005/064065 A1 a device for monitoring a drive belt of a clothes dryer with a rotatable drum for receiving laundry, a motor, a drive belt between the drive motor and drum, a tensioning device which is movable for tensioning the drive belt relative to the drive belt in a clamping movement direction, and a switch which operates becomes when the tensioning device is moved in the clamping movement direction over a predetermined distance to turn off the clothes dryer.
  • the temperature in the process air stream above a heater and before the laundry drum is detected periodically with a first temperature sensor, from values recorded at successive times a difference value or a gradient is formed, which has a predetermined value, hereinafter referred to as "first permissible difference value is compared, wherein when the newly formed difference value is absolutely greater than the first allowable difference value, a count value is increased by one step and this count value is compared with a predetermined count value. If the current count is greater than the predetermined count, the heater of the clothes dryer is turned off and / or a warning operating status display is activated.
  • the current difference value is compared with a predetermined second allowable difference value, which corresponds to a permissible temperature increase resulting from a lint filter blockage.
  • a predetermined second allowable difference value which corresponds to a permissible temperature increase resulting from a lint filter blockage.
  • Another method for detecting a critical state or an impermissible operating state, in particular for detecting a fault occurring due to reduced process air flow in a drum dryer during the drying of wet laundry by means of process air is off DE 43 37 735 A1 known.
  • the process air stream is heated by a heater in a supply air duct in front of a drum of the drum dryer and enters after passage through the drum in an exhaust duct.
  • a measured value of the residual moisture content of the Laundry as criterion for the detection of the critical condition.
  • the temperature of the process air is measured with a temperature sensor arranged in the exhaust duct behind the drum. The temperature measured in this way is evaluated as a further criterion with respect to the determination of the critical state.
  • EP 0 906 985 B1 is a method for detecting an impermissible operating state in an electronically controlled tumble dryer, in particular the state of motion of the laundry drum, described in which the electrical conductance of the laundry is determined by means of electrodes which touch the laundry at least temporarily. Changes in the guide values are observed in order to make a decision on the continuation of the operation from a change. If, in this case, the change in the conductance over a period of several periods corresponding to the values compared corresponds to a preset small fluctuation range, a standstill of the laundry drum is detected and a corresponding signal is displayed, and the drying process can be aborted.
  • the presence of a standstill is determined relatively late in these methods, since on the one hand the first temperature sensor between the heater and the drum is still flowed around with the normal amount of process air, so that the change in the temperature of the process air at the first temperature sensor relatively late effect, and on the other a change in the conductivity of the laundry below a predetermined level can be detected only with a certain delay.
  • An object of the present invention is therefore to provide an improved method for detecting the stoppage of a drum in a drum dryer.
  • the present invention has for its object to provide a corresponding drum dryer, in which a standstill of the drum can be detected in good time and reacted to it.
  • a drum dryer with the features of claim 7.
  • a preferred embodiment of the drum dryer is in Claim 8 specified.
  • further preferred embodiments of the drum dryer from preferred embodiments of the method according to the invention.
  • the temperature of the process air by means measured in the exhaust duct downstream of the drum second temperature sensor and evaluated the change in the temperature of the process air with respect to the determination of the stoppage of the drum.
  • the conductivity of the laundry is measured in the drum and evaluated the change in the conductance in terms of determining the stoppage of the drum.
  • the temperature of the process air at the second temperature sensor is preferably detected periodically, a difference value or a gradient, which is compared with a predefined first permissible difference value, formed from values acquired at successive times, wherein if the newly formed difference value is absolutely greater than predetermined difference value, a set to zero at the beginning of drying count is increased by one step.
  • This count is compared in this preferred embodiment with a predetermined count and, if the current count is greater than the predetermined count, the heater (heater) of the drum dryer is turned off and / or a warning operating status display is activated.
  • the difference value is compared with a predetermined second allowable difference value, which corresponds to a permissible temperature increase resulting from a lint screen clogging (lint filter temperature difference value) with a determined difference value which is smaller than the first permissible difference value.
  • a predetermined second allowable difference value which corresponds to a permissible temperature increase resulting from a lint screen clogging (lint filter temperature difference value) with a determined difference value which is smaller than the first permissible difference value.
  • the overheating of the process air flow can be determined as such due to a stopped drum or such overheating hazard can be detected in good time before reaching the high temperature, whereupon appropriate countermeasures, in particular the shutdown of the heater can be done. As a result, damage to components and located in the drum dryer laundry can be avoided.
  • an indicator with an indication of a clogged lint filter may also be activated. Thereafter, an operator of the drum dryer is able to perform a corresponding lint screen cleaning, and due to appropriately preselected values, a display for prompting the lint filter may be displayed long before its complete clogging and thus the drum dryer can always operate in a satisfactory and energy efficient operating condition ,
  • the process according to the invention can advantageously be used both in a condensation dryer and in an exhaust air dryer.
  • the temperature of the process air stream is detected in the exhaust duct downstream of the drum from the beginning of drying, whereby the entire temperature profile is detected in the drum dryer.
  • the conductivity is detected periodically during drying and the current detected conductance is compared with at least one previously detected conductance. If the change in the conductance determined from the values compared over a period of several periods corresponds to a previously set small fluctuation range, an indication of the standstill of the drum and / or a shutdown of the heating takes place in this embodiment.
  • the measurement of the conductance of the laundry (also referred to as laundry control value or laundry voltage signal) in the drum of a drum dryer can be realized, for example, by the drum having a measuring electrode and at the same time serving as the second electrode.
  • the drum is then usually connected to a ground potential of the drum dryer and is the measuring electrode via a series resistor to a constant voltage connected.
  • the laundry control signal remains constant. The missing fluctuation of this signal can be used to detect the standstill.
  • the small fluctuation range of the Wäscheleitivess is preset in dependence on the loading amount of the drum. This has the advantage that an inadmissible shutdown of the drying process when rotating the drum is avoided. At very high loading and especially at the beginning of the drying process at high humidity of the laundry may result that constantly wet laundry is applied to the electrodes and the change in conductance is therefore very low. The fluctuation range of the conductance value is then preset accordingly low. The fluctuation range may also be zero or substantially zero.
  • the measured values for temperature and, if appropriate, the laundry control value are evaluated in an electronic control device in order to obtain a more reliable statement about the standstill of the drum. Since the temperature at the drum outlet to avoid damage to the laundry is generally limited by the control device to defined values (limit temperature), the heating power is reduced. In connection with the reconnection of the heater when falling below a threshold temperature, therefore, an oscillation (clocks) of the heating power is generated, which can be used for the determination of a drum standstill.
  • a neural network Preferably, a neural network, a fuzzy logic, a sharp mathematical combination or a combination of these means and methods come into question for the evaluation algorithm in the control device.
  • the drying process is stopped, so that a partial overheating of the laundry, which can occur when the drum is at a standstill, is avoided, even if the drying process is unobserved by a user.
  • the present invention also relates to a drum dryer suitable for carrying out the method described above with a drum for drying wet laundry by means of process air, a heating device in a supply air duct in front of the drum for Heating the process air and an exhaust duct downstream of the drum, wherein in the drum, a measuring electrode for measuring the conductance of the laundry is provided and is located in the exhaust duct, a second temperature sensor.
  • the drum dryer has a control device for evaluating the temperature measured by the second temperature sensor and, if appropriate, the conductivity value of the laundry measured by the measuring electrode with regard to the determination of a drum standstill.
  • the inventive method for detecting the drum standstill and the drum dryer according to the invention have numerous advantages.
  • the safety during operation of the drum dryer is increased.
  • the method according to the invention it is possible, due to the temperature rise caused by the drum standstill, to detect the state of the drum dryer far in advance of the actual reaching of too high a temperature and to switch off the heating in good time before reaching too high a temperature.
  • the components of the drum dryer itself, but also the laundry parts located in the drum are safely protected against overheating.
  • the solution according to the invention is cost-neutral, since possibly existing sensors for the temperature and possibly the Wäscheleitwert can be used.
  • the method according to the invention is characterized by a higher accuracy compared to previous software-supported methods.
  • FIG. 1 a partial section through a drum dryer is shown, showing both the variant of an exhaust air dryer type (solid lines) and the type of a condensation air dryer with circulating air principle (dashed lines).
  • Fig. 2 shows a schematic circuit structure for carrying out an embodiment of the method.
  • FIG. 1 is shown in partial sectional view of a drum dryer 1. This has in its upper part on a program control device 3, which is adjustable by an operating handle 5 and may preferably include a fuzzy processor controller, not shown here.
  • a program control device 3 which is adjustable by an operating handle 5 and may preferably include a fuzzy processor controller, not shown here.
  • the drum dryer 1 has a drum 2, which is accessible via a pot 9 from a feed door 11 and placed on the wet laundry in the drum 2 and can be removed again after drying.
  • a process air opening 13 is arranged, which sucks in air from outside via a fan 15 and flows into a process air channel 17. From the process air duct 17, the fresh process air flows via a heating device 18 to the inlet 21 of the drum 2. Between the heating unit 18 and the drum 2, a first temperature sensor 10 is provided which measures the temperature of the effluent from the heater process air and thus in particular a criterion for the correct function of the heater 18 supplies. The process air traverses the drum 2 and flows at the outlet 23 through an exhaust duct 25. Behind the drum 2, a second temperature sensor 12 is arranged in the exhaust duct 25, which periodically detects the temperature of the process air at predetermined time intervals and the measured value of a corresponding control device (not shown). supplies.
  • the process air flows through the exhaust duct 25 to an exhaust outlet 27, from where it flows back into the open air.
  • the drum dryer 1 of this embodiment thus operates on the exhaust air principle.
  • the process air circuit can also be closed to form a forced air tumble dryer, wherein the process air is guided from the exhaust duct 25 to a condenser 29.
  • the condenser 29 is designed as a heat exchanger in which the moist process air is cooled and condenses the increased humidity and separates from the process air.
  • the process air is then forwarded by the fan 15 in the process air duct 17 again.
  • the condensate may be in FIG. 1 not shown manner at a suitable location removed from the drum dryer 1 or pumped into a condensate tank, from which it can be removed by hand.
  • the manifold 28 of the exhaust duct 25 and the fan 15 are reversed and connected to the respective nozzle 31 and 32 of the condenser 29.
  • Fig. 2 shows the drum 2 of a drum dryer 1, which contains a measuring electrode 6.
  • the drum 2 acts as such.
  • the drum 2 is connected to the mass 4 of the drum dryer 1 and the measuring electrode 6 is connected via a series resistor 8 to a constant voltage source 7.
  • the laundry in the drum 2 has a laundry resistance 19, which is connected on the one hand via the drum 2 with the mass 4 of the drum dryer 1 and on the other hand via the measuring electrode 6 sporadically with the series resistor 8 and thus forms a voltage divider with this.
  • a measurement signal 20 is obtained, which serves as a measure of the conductance of the laundry (Wäscheleitwert).
  • the measuring signal 20 can be advantageously supplied to the input of an anti-aliasing filter 16 whose output is connected to an analog input of a control device 14.
  • the second temperature sensor 12 is located in the exhaust duct 25 behind the output of the process air flow from the drum 2, see. Fig. 1 , The second temperature sensor 12 is also connected to the control device 14 for evaluating the signals measured by it.
  • the conductivity measuring signal 20 Upon movement of the laundry in the drum 2 by the rotation of the laundry gets at least partially in contact with the measuring electrode 6 and thus causes a time-varying signal for the conductance (conductivity measurement signal 20).
  • the conductivity measuring signal 20 changes markedly. If no item of laundry touches the measuring electrode 6 or a piece of laundry only slightly touches the electrode and therefore a lower conductance is measured, the conductivity measuring signal 20 has a minimum value. In contrast, with very good electrical connection between the measuring electrode 6 and the laundry, the conductivity measuring signal 20 will have a maximum value.
  • the conductance does not change or only slightly, either one and the same garment always rests against the measuring electrode 6 or, if they are in is located at the top of the drum 2, no laundry is permanently applied and thus the conductance is zero.
  • the changes in the temperature at the second temperature sensor 12 as well as the changes in the conductance measured by means of the measuring electrode 6 are correspondingly evaluated, as also described above.
  • the temperature of the process air by means of the second temperature sensor 12 is measured to detect the standstill of the drum 2, and evaluated the change in the temperature of the process air with respect to the determination of the standstill of the drum 1.
  • the temperature of the process air at the second temperature sensor 12 is detected periodically, formed from respectively successive times values respectively a difference value or a gradient, which is compared with a predetermined first allowable difference value, wherein if the newly formed difference value is absolutely greater than the predetermined difference value is to increase a count set to zero at the beginning of the drying by one step.
  • This count value is compared with a predetermined count value and, if the current count value is greater than the predetermined count value, the heater 18 is turned off and a warning operating status indicator on the operating handle 5 is activated.
  • the current difference value is compared with a predetermined second allowable difference value corresponding to a permissible temperature increase resulting from clogging of the lint filter 26 (lint temperature difference value). If the determined difference value is less than the lint filter temperature difference value, increasing a lint count value set to zero at the beginning of drying by one step increases the newly formed lint count value with a predetermined allowable lint count value and if the newly formed lint count is greater than the allowed lint count, then an indication or indication of lint clogging is enabled.
  • a measurement of the conductance of the laundry present in the tumble dryer 1 is used to determine the standstill of the drum 2.
  • the conductance of the laundry in the drum 2 is measured and evaluated the change in the conductance in terms of determining the stoppage of the drum 2.
  • the conductivity is detected periodically during drying and the current detected conductance is compared with at least one previously detected conductance. If the change in the conductance determined from the values compared over a period of several periods corresponds to a previously set small fluctuation range, the standstill of the drum 2 is displayed and the heater 18 is switched off.
  • the measurement of the conductance of the laundry (also referred to as laundry control value or laundry voltage signal) in the drum 2 is realized by the measuring electrode 6 and the drum 2 itself as a second electrode.
  • the drum 2 is connected to a ground potential of the drum dryer 1 and the measuring electrode 6 is connected via the series resistor 8 to a constant voltage.
  • the laundry control signal remains constant. The missing fluctuation of this signal is used to detect the standstill.
  • the small fluctuation range of the Wäscheleitivess depending on the loading amount of the drum 2 is preset. This has the advantage that an inadmissible shutdown of the drying process during rotation of the drum 2 is avoided. At very high loading and especially at the beginning of the drying process at high humidity of the laundry may result that constantly wet laundry is applied to the electrodes 2 and 6 and the change in conductance is therefore very low. The fluctuation range of the conductance value is then preset accordingly low. The fluctuation range may also be zero or substantially zero.
  • the measured values for temperature and Wäscheleitwert be evaluated in the electronic control device 14 in order to obtain a safer statement about the stoppage of the drum 2. Since the temperature at the outlet of the drum 2 for preventing damage to the laundry is generally limited by the control device 14 to defined values (limit temperature), the power of the heater 18 is reduced. in the In connection with the reconnection of the heater 18 falls below a threshold temperature, therefore, an oscillation (clocks) of the heating power is generated, which can be used for the determination of a standstill of the drum 2.
  • a neural network Preferably, for the evaluation algorithm in the control device 14, a neural network, a fuzzy logic, a sharp mathematical combination or a combination of these means and methods in question.

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

Claims (8)

  1. Procédé de détection d'un état critique pouvant entraîner un endommagement du linge et compromettant la sécurité de fonctionnement, dans un séchoir à tambour (1) pendant le séchage de linge humide au moyen d'air de traitement chauffé par un dispositif de chauffage (18) dans un canal d'amenée d'air (17) devant le tambour (2) et entrant dans un canal d'évacuation d'air (25) après son passage à travers le tambour (2), la température de l'air de traitement étant mesurée au moyen d'un deuxième capteur de température (12) disposé dans le canal d'évacuation d'air (25) derrière le tambour (2) et la température de l'air de traitement étant évaluée en vue de déterminer l'état critique, caractérisé en ce que la variation de la température de l'air de traitement est évaluée en vue de déterminer l'arrêt du tambour (2), qui est l'état critique à détecter.
  2. Procédé selon la revendication 1, caractérisé en ce que la conductance (20) du linge dans le tambour (2) est mesurée et en ce que la variation de la conductance est elle aussi évaluée en vue de déterminer l'arrêt du tambour.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la température de l'air de traitement au deuxième capteur de température (12) est détectée périodiquement, une valeur différentielle, ou gradient, est formée chaque fois à partir de valeurs détectées à des instants successifs, qui est comparée à une première valeur différentielle admissible prédéfinie, et, si la nouvelle valeur différentielle ainsi formée est strictement supérieure à la première valeur différentielle admissible, une valeur de comptage mise à zéro au début du séchage est incrémentée d'un pas, cette valeur de comptage est comparée à une valeur de comptage prédéfinie et, dès lors que la valeur de comptage actuelle est supérieure à la valeur de comptage prédéfinie, le dispositif de chauffage (18) est arrêté et/ou un affichage d'état de fonctionnement (5) est activé.
  4. Procédé selon la revendication 3, caractérisé en ce que, lorsque la valeur différentielle de température déterminée est inférieure à la première valeur différentielle admissible, la valeur différentielle déterminée est comparée à une deuxième valeur différentielle admissible prédéfinie (valeur différentielle de température du filtre à peluches), qui correspond à une augmentation de température admissible due à une obstruction d'un filtre à peluches (26) dans le séchoir à tambour (1).
  5. Procédé selon la revendication 4, caractérisé en ce que, lorsque la valeur différentielle de température déterminée est inférieure à la deuxième valeur différentielle admissible, une valeur de comptage du filtre à peluches mise à zéro au début du séchage est incrémentée d'une valeur de comptage, la nouvelle valeur de comptage du filtre à peluches ainsi formée est comparée à une valeur de comptage du filtre à peluches prédéfinie et, si la nouvelle valeur de comptage du filtre à peluches ainsi formée est supérieure à la valeur de comptage du filtre à peluches prédéfinie, un affichage ou une indication d'obstruction est activé(e).
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la conductance (20) est déterminée périodiquement pendant le séchage, la conductance (20) déterminée actuelle est comparée à au moins une conductance (20) déterminée auparavant et, si la variation de la conductance (20) déterminée à partir des valeurs comparées correspond sur une durée comprenant plusieurs périodes à une faible amplitude de variation réglée d'avance, l'arrêt du tambour (2) est affiché et/ou le dispositif de chauffage (18) est désactivé.
  7. Séchoir à tambour (1) pour la mise en oeuvre du procédé selon l'une des revendications 1 à 6, comprenant un tambour (2) pour le séchage de linge humide au moyen d'air de traitement, un dispositif de chauffage (18) dans un canal d'amenée d'air (17) devant le tambour (2) pour chauffer l'air de traitement, un canal d'évacuation d'air (25) derrière le tambour (2) et un deuxième capteur de température (12) disposé dans le canal d'évacuation d'air (25) derrière le tambour (2), caractérisé en ce qu'il comporte un dispositif de commande (14) pour évaluer la température mesurée par le deuxième capteur de température (12) en vue de déterminer un arrêt du tambour et en ce que le dispositif de commande (14) est adapté pour évaluer la variation de la température mesurée par le deuxième capteur de température (12) en vue de déterminer un arrêt du tambour.
  8. Séchoir à tambour (1) selon la revendication 7, caractérisé en ce qu'il comprend une électrode de mesure (6) pour mesurer la conductance (20) du linge et en ce que le dispositif de commande (14) est également adapté pour évaluer la variation de la conductance (20) du linge mesurée par l'électrode de mesure (6) en vue de déterminer un arrêt du tambour.
EP07729432.0A 2006-06-02 2007-05-23 Procédé pour détecter l'arrêt d'un tambour dans un séchoir à tambour et séchoir à tambour approprié à cet effet Not-in-force EP2035617B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006025952A DE102006025952A1 (de) 2006-06-02 2006-06-02 Verfahren zur Erkennung des Stillstands einer Trommel in einem Trommeltrockner, und hierzu geeigneter Trommeltrockner
PCT/EP2007/054994 WO2007141139A1 (fr) 2006-06-02 2007-05-23 Procédé pour détecter l'arrêt d'un tambour dans un séchoir à tambour et séchoir à tambour approprié à cet effet

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EP2035617A1 EP2035617A1 (fr) 2009-03-18
EP2035617B1 true EP2035617B1 (fr) 2018-08-08

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EP (1) EP2035617B1 (fr)
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DE102006025952A1 (de) 2007-12-06
EP2035617A1 (fr) 2009-03-18
WO2007141139A1 (fr) 2007-12-13
US20090126220A1 (en) 2009-05-21

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