EP0723046A1 - Device for measuring the drying degree in a laundry drier - Google Patents

Device for measuring the drying degree in a laundry drier Download PDF

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Publication number
EP0723046A1
EP0723046A1 EP96400075A EP96400075A EP0723046A1 EP 0723046 A1 EP0723046 A1 EP 0723046A1 EP 96400075 A EP96400075 A EP 96400075A EP 96400075 A EP96400075 A EP 96400075A EP 0723046 A1 EP0723046 A1 EP 0723046A1
Authority
EP
European Patent Office
Prior art keywords
drops
drying
condensation
measuring
frequency
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.)
Ceased
Application number
EP96400075A
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German (de)
French (fr)
Inventor
Francois Garofalo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Industrielle dAppareils Menagers SA CIAPEM
Original Assignee
Compagnie Industrielle dAppareils Menagers SA CIAPEM
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Filing date
Publication date
Application filed by Compagnie Industrielle dAppareils Menagers SA CIAPEM filed Critical Compagnie Industrielle dAppareils Menagers SA CIAPEM
Publication of EP0723046A1 publication Critical patent/EP0723046A1/en
Ceased legal-status Critical Current

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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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/26—Condition of the drying air, e.g. air humidity or 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
    • D06F2103/02—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
    • D06F2103/38—Time, e.g. duration
    • 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
    • D06F2103/44—Current or voltage
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/68—Operation mode; Program phase
    • 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
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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 present invention relates to a device for measuring the degree of drying in a dryer. It applies in particular to condenser dryers.
  • a first measurement mode uses temperature sensors.
  • the drying stop is conditioned by temperature levels, temperature differences between different sensors or temperature variations. These temperatures are measured at various locations on the device. The temperatures measured are, for example, in particular the air outlet temperature of the basket, the air inlet temperature of the basket and the inlet and outlet temperatures of the condenser.
  • a second known method of measuring drying uses the measurement of the resistance of the laundry, the latter being all the more conductive when it is wet. Measuring the resistance of the laundry gives good information on its drying level.
  • Another drying measurement mode uses one or more humidity sensors placed in the air flow. These sensors are for example made up of a microporous pellet with a dielectric which varies as a function of humidity, the measurement of this variation being made for example by a measurement of variation in electrical capacity. The humidity of the air coming out of the basket is higher the more the laundry is wet. A humidity information management allows to measure the drying.
  • a simpler and less expensive solution to protect users against the risk of electric shock for example consists in providing a double cut of the electrical supply by two door micro-contacts, so that when the door is open, the power supply is cut off.
  • a reprogramming is then necessary each time the door is opened.
  • Humidity sensors are indeed expensive. Furthermore, they are fouled by the fluff of linen and therefore require regular cleaning, restricting for users.
  • the object of the invention is to overcome the aforementioned drawbacks and to allow in particular an economical drying measurement while being precise.
  • the subject of the invention is a device for measuring the degree of drying in a condenser dryer, characterized in that it comprises at least means for detecting drops of condensation, means for measuring the frequency of appearance of these drops and processing means determining the degree of drying as a function of the frequency of appearance of the drops.
  • the main advantages of the invention are in particular that it does not require specific maintenance, that it provides electrical protection for users, that it allows easy adjustment of the measurements, that it improves the reliability of the latter. and that it is simple to implement.
  • FIG. 1 illustrates by a temperature curve 1 ⁇ as a function of time the temperature phases inside a condenser dryer.
  • the moist air passes through the condenser and the drops of condensation are directed to a collecting tank.
  • the temperature ⁇ increases significantly.
  • the temperature ⁇ begins to stabilize and drops of condensation appear intermittently.
  • the temperature ⁇ is substantially stabilized and a regular flow of the condensation drops occurs, it is the active phase of drying.
  • a rise in temperature begins to occur and the flow of the condensation drops becomes intermittent again, the laundry is then partly dry.
  • the temperature rise continues, the drops of condensation no longer occur, the laundry is dry.
  • the principle of managing the drying by the device according to the invention consists in measuring the frequency of appearance of the condensation drops produced by the drying and also defining, for example, the drying time, for example by measuring time or temperature. , and deduce according to these parameters the degree of drying of the laundry.
  • a single measurement of the frequency of appearance of the drops can however allow the degree of drying or its end to be defined.
  • Figure 2 shows a block diagram of a device according to the invention.
  • the latter comprises means 20 for detecting drops of condensation, means 21 for measuring the frequency of appearance of the drops of condensation and for example means 22 for determining the drying time.
  • These means 22 are for example means for measuring the time since the start of drying. A time sensor can be used.
  • These means 22 can also be, for example, a temperature sensor for measuring the laundry inside the dryer.
  • the means 21, 22 above are connected to processing means 23 consisting for example of a processor, memories and other necessary digital or analog interfaces.
  • the means 22 for determining the drying moment can for example be integrated into the treatment means 23.
  • the time indication roughly indicates in which phases A, B, C, D or E described above the drying moment occurs.
  • the processing means 23 determine an end of drying.
  • the determination means 22 are a temperature sensor, it is still possible to define roughly the drying phase. As in the previous case, measuring the frequency of the condensation drops makes it possible to conclude definitively on the drying. It should be noted that a temperature measurement alone cannot measure precisely the degree of drying and that a treatment of several temperature measurements is necessary.
  • the device according to the invention notably avoids the associated heaviness. Thus, a relatively low temperature combined with an absence of drops of condensation or an intermittent flow of these makes it possible to conclude that the drying is at its beginning, while a relatively high temperature and an intermittent flow or an absence of drops of condensation makes it possible to conclude at the end of drying.
  • the means 22 for determining the drying time are integrated into the treatment means 23, the latter memorize for example the different successive phases A, B, C, D, E previously described thanks to the successive measurements carried out by the means 21 for measuring the frequency of appearance of the drops of condensation.
  • these means 21 no longer detecting drops, and having previously enabled the detection of phases A, B, C, D by the measurements of frequency of appearance of condensation drops, the processing means 23 having memorized the existence of these previous phases, deduce the end of drying of the laundry, that is to say phase E.
  • FIG. 3 shows a possible embodiment of means for detecting drops of condensation which, associated with a counter for example, makes it possible to detect the frequency of appearance of these drops.
  • the counter can for example be integrated in the processing means 23.
  • the detection means consist for example of a PTC type thermistor 31, that is to say with a positive temperature coefficient. They could just as easily consist of a thermistor with a negative temperature coefficient. This thermistor has the distinction of having a sudden transition for a given temperature level.
  • FIG. 4 illustrates this transition by a characteristic curve 41.
  • This curve represents the resistance R of the thermistor as a function of its temperature ⁇ .
  • the thermistor is supplied by a current I which brings it to a temperature higher than that of the condensation drops, the switching temperature level T b being higher than the temperature of the drops.
  • the zone of low resistance R corresponds to a cold zone, below the temperature T b
  • the zone of high resistance R corresponds to the hot zone, beyond the switching temperature T b .
  • the tilting zone 42 there is the tilting zone 42.
  • the thermistor 31 is for example embedded in a resin 32.
  • a supply wire 33 connects the thermistor to a current source 51 as illustrated in FIG. 5.
  • the thermistor 31 coated with the resin 32 is placed in the passage for the flow of the drops 61.
  • the flow of these drops on the thermistor 31 switches the temperature of the thermistor in its cold zone of temperature, below the switching temperature T b .
  • the meeting of a drop 61 with the thermistor 31 makes the temperature of the latter drop.
  • the coating of resin around the thermistor 31 is for example as thin as possible to facilitate the tilting of temperature in one direction and in the other and therefore the tilting of the value of the resistance of the thermistor 31 in one direction and in the other. This is in fact possible thanks in particular to the very low thermal inertia of the thermistor 31 covered with a thin layer of resin.
  • Means make it possible to measure the voltage U o across the thermistor.
  • the voltage U o across its terminals is very low because the resistance R is low, hence a low value Rl.
  • the voltage U o is high due to the high value of the resistance R of the thermistor. A binary signal depending on the appearance of the drops of condensation 61 is thus created.
  • the frequency of this binary signal is representative, even equal, to the frequency of appearance of the drops of condensation.
  • FIG. 7 illustrates such a signal.
  • This signal illustrated by a curve 71 is for example the voltage U o across the thermistor as a function of the temperature ⁇ of the latter.
  • the processing means 23 can find the different drying phases A, B, C, D, E previously defined.
  • the binary signal remains, for example, at zero.
  • the drying phase is then phase A.
  • the signal passes intermittently to state one, this is the second phase B.
  • the flow rate of the drops becoming strong and constant, the signal remains continuously at one, this is the third drying phase C, the active phase.
  • the signal 71 returns intermittently to state one, this is phase D, the beginning of the end of drying.
  • the signal 71 definitively drops back to the zero state, it is phase E, the drying is finished.
  • a signal of opposite binary logic could obviously be used in the same way.
  • FIG. 8 illustrates by an enlargement of the curve 71, the binary signal in phase D.
  • the frequency of appearance of the drops decreases.
  • Means for measuring the time between two consecutive drops makes it possible to detect this decrease in frequency.
  • stopping the appearance of the drops of condensation after a reduction in the frequency of this appearance means an end of drying which the processing means can easily detect. For example, if at the end of a given time, no more drop appears, the treatment means conclude at the end of the drying.
  • An infrared diode can for example be used in combination with an infrared receiver, the drops of condensation passing between the diode and the receiver.
  • the latter provides a binary signal as a function of the passage of the condensation drops therefore representative of the flow rate of the latter caused by drying.

Abstract

The system to measure the drying action on laundry, in a hot air dryer, has at least one unit (20) to register the condensation droplets. A unit (21) measures the frequency of droplet development for a further unit (23) to determine the condition of the laundry as a function of condensation droplet development frequency.

Description

La présente invention concerne un dispositif de mesure du degré de séchage dans un sèche-linge. Elle s'applique notamment aux séche-linge à condenseur.The present invention relates to a device for measuring the degree of drying in a dryer. It applies in particular to condenser dryers.

Plusieurs dispositifs de mesure du degré de séchage du linge sont connus.Several devices for measuring the degree of drying of the laundry are known.

Un premier mode de mesure utilise des capteurs de température. L'arrêt du séchage est conditionné par des niveaux de températures, des écarts de températures entre différents capteurs ou encore des variations de température. Ces températures sont mesurées à divers endroits de l'appareil. Les températures mesurées sont par exemple notamment la température de sortie d'air du panier, la température d'entrée d'air du panier et les températures d'entrée et sortie du condenseur.A first measurement mode uses temperature sensors. The drying stop is conditioned by temperature levels, temperature differences between different sensors or temperature variations. These temperatures are measured at various locations on the device. The temperatures measured are, for example, in particular the air outlet temperature of the basket, the air inlet temperature of the basket and the inlet and outlet temperatures of the condenser.

Un deuxième mode de mesure du séchage connu utilise la mesure de la résistance du linge, ce dernier étant d'autant plus conducteur qu'il est humide. La mesure de la résistance du linge donne une bonne information sur son niveau de séchage.A second known method of measuring drying uses the measurement of the resistance of the laundry, the latter being all the more conductive when it is wet. Measuring the resistance of the laundry gives good information on its drying level.

Un autre mode de mesure du séchage utilise un ou plusieurs capteurs d'humidité placés dans le flux d'air. Ces capteurs sont par exemple constitués d'une pastille microporeuse avec un diélectrique qui varie en fonction de l'humidité, la mesure de cette variation se faisant par exemple par une mesure de variation de capacité électrique. L'humidité de l'air qui sort du panier est d'autant plus élevée que le linge est humide. Une gestion de l'information d'humidité permet de mesurer le séchage.Another drying measurement mode uses one or more humidity sensors placed in the air flow. These sensors are for example made up of a microporous pellet with a dielectric which varies as a function of humidity, the measurement of this variation being made for example by a measurement of variation in electrical capacity. The humidity of the air coming out of the basket is higher the more the laundry is wet. A humidity information management allows to measure the drying.

D'autres modes de mesure connus et possibles combinent par exemple plusieurs des modes de mesures précédents.Other known and possible measurement modes combine, for example, several of the preceding measurement modes.

Ces différents modes de mesure de l'état du séchage du linge dans une machine à sécher présentent certains inconvénients.These different modes of measuring the state of drying of the laundry in a drying machine have certain drawbacks.

En ce qui concerne la solution utilisant la mesure de températures, cette solution est efficace mais demande des essais et des délais de mise en oeuvre importants. Elle conduit par ailleurs à des logiciels complexes de gestion des températures mesurées du type par exemple systèmes experts ou encore logique floue. Les temps de développement importants, les capacités mémoires nécessaires ainsi notamment que la complexité des éventuelles modifications de programme rendent cette solution coûteuse.With regard to the solution using temperature measurement, this solution is effective but requires considerable testing and implementation times. It also leads to complex software for managing the measured temperatures, for example of the type of expert systems or even fuzzy logic. The significant development times, the memory capacities required as well as in particular the complexity of possible program modifications make this solution expensive.

Dans le cas de la mesure de la résistance électrique du linge, se pose notamment des problèmes de fiabilité et de sécurité électrique. En effet, cette solution fait appel à un ou deux contacts électriques tournant. Ces contacts sont difficiles à mettre au point et s'usent à cause des frottements mécaniques. Par ailleurs, des charges électrostatiques emmagasinées dans le linge peuvent se décharger via ces contacts dans les circuits électroniques de commande, notamment des microprocesseurs et perturber ainsi le programme déroulé par ces derniers. Enfin, le panier du sèche-linge se trouvant au contact de l'électronique et notamment du courant de mesure, il est nécessaire de prévoir le câblage d'un transformateur de sécurité à forte isolation électrique afin de protéger les utilisateurs. Il en résulte une complexité accrue et aussi un surcoût.In the case of measuring the electrical resistance of the linen, there are in particular problems of reliability and electrical safety. Indeed, this solution uses one or two rotating electrical contacts. These contacts are difficult to develop and wear out due to mechanical friction. Furthermore, electrostatic charges stored in the laundry can be discharged via these contacts in the electronic control circuits, in particular microprocessors and thus disturb the program carried out by the latter. Finally, the basket of the dryer being in contact with the electronics and in particular the measurement current, it is necessary to provide for the wiring of a safety transformer with high electrical insulation in order to protect the users. This results in increased complexity and also an additional cost.

Une solution plus simple et moins coûteuse pour assurer la protection des utilisateurs contre les risques d'électrocution, consiste par exemple à prévoir une coupure double de l'alimentation électrique par deux micro-contacts de porte, de façon à ce que quand la porte est ouverte, l'alimentation électrique soi coupée. Cependant, cela entraîne la coupure totale de l'appareil et donc une perte du programme alors en cours de déroulement par le microprocesseur de commande de l'appareil. Une reprogrammation est alors nécessaire à chaque ouverture de la porte.A simpler and less expensive solution to protect users against the risk of electric shock, for example consists in providing a double cut of the electrical supply by two door micro-contacts, so that when the door is open, the power supply is cut off. However, this results in the complete shutdown of the device and therefore a loss of the program then in progress by the microprocessor controlling the device. A reprogramming is then necessary each time the door is opened.

Dans le cas de la mesure de l'humidité de l'air, se pose le problème du coût des capteurs. Les capteurs d'humidité sont en effet chers. Par ailleurs, ils subissent un encrassement par la bourre de linge et nécessitent alors un nettoyage régulier, contraignant pour les utilisateurs.In the case of air humidity measurement, there is the problem of the cost of the sensors. Humidity sensors are indeed expensive. Furthermore, they are fouled by the fluff of linen and therefore require regular cleaning, restricting for users.

Le but de l'invention est de palier les inconvénients précités et de permettre notamment une mesure du séchage économique tout en étant précise.The object of the invention is to overcome the aforementioned drawbacks and to allow in particular an economical drying measurement while being precise.

A cet effet, l'invention a pour objet un dispositif de mesure du degré de séchage dans un sèche-linge à condenseur, caractérisé en ce qu'il comprend au moins des moyens de détection des gouttes de condensation, des moyens de mesure de la fréquence d'apparition de ces gouttes et des moyens de traitement déterminant le degré de séchage en fonction de la fréquence d'apparition des gouttes.To this end, the subject of the invention is a device for measuring the degree of drying in a condenser dryer, characterized in that it comprises at least means for detecting drops of condensation, means for measuring the frequency of appearance of these drops and processing means determining the degree of drying as a function of the frequency of appearance of the drops.

L'invention a notamment pour principaux avantages qu'elle ne nécessite pas d'entretien spécifique, qu'elle assure une protection électrique des utilisateurs, qu'elle permet une mise au point facile des mesures, qu'elle améliore la fiabilité de ces dernières et qu'elle est simple à mettre en oeuvre.The main advantages of the invention are in particular that it does not require specific maintenance, that it provides electrical protection for users, that it allows easy adjustment of the measurements, that it improves the reliability of the latter. and that it is simple to implement.

D'autres caractéristiques et avantages de l'invention apparaîtront à l'aide de la description qui suit faite en regard de dessins annexés qui représentent :

  • la figure 1, une courbe de température représentant les phases de séchage à l'intérieur d'un sèche-linge ;
  • la figure 2, un synoptique d'un exemple de réalisation d'un dispositif selon l'invention ;
  • la figure 3, un moyen de détection de gouttes de condensation ;
  • la figure 4, une courbe de température caractéristique d'une thermistance ;
  • la figure 5, le moyen de détection précité relié à une source de courant ;
  • la figure 6, le moyen de détection précité situé dans le passage de gouttes de condensation ;
  • la figure 7, un signal binaire représentatif du débit des gouttes de condensation ;
  • la figure 8, une partie agrandie de la courbe représentative du signal précité.
Other characteristics and advantages of the invention will become apparent from the following description given with reference to the accompanying drawings which represent:
  • Figure 1, a temperature curve representing the drying phases inside a dryer;
  • Figure 2, a block diagram of an exemplary embodiment of a device according to the invention;
  • FIG. 3, a means for detecting drops of condensation;
  • FIG. 4, a temperature curve characteristic of a thermistor;
  • Figure 5, the aforementioned detection means connected to a current source;
  • Figure 6, the aforementioned detection means located in the passage of condensation drops;
  • FIG. 7, a binary signal representative of the flow rate of the condensation drops;
  • Figure 8, an enlarged part of the curve representative of the aforementioned signal.

La figure 1 illustre par une courbe 1 de température θ en fonction du temps les phases de température à l'intérieur d'un sèche-linge à condenseur. Durant le séchage, l'air humide traverse le condenseur et les gouttes de condensation sont dirigées vers un bac de récupération. Dans une première phase A, la température θ croit de façon significative. Durant cette phase, il n'y a pas encore d'apparition de gouttes de condensation. Dans une deuxième phase B, la température θ commence à se stabiliser et des gouttes de condensation apparaissent par intermittence. Dans une troisième phase C, la température θ est sensiblement stabilisée et un débit régulier des gouttes de condensation se produit, c'est la phase active du séchage. Dans une quatrième phase D, une remontée en température commence à se produire et le débit des gouttes de condensation redevient intermittent, le linge est alors en partie sec. Enfin, dans une dernière phase E, la montée en température se poursuit, les gouttes de condensation ne se produisent plus, le linge est sec.FIG. 1 illustrates by a temperature curve 1 θ as a function of time the temperature phases inside a condenser dryer. During drying, the moist air passes through the condenser and the drops of condensation are directed to a collecting tank. In a first phase A, the temperature θ increases significantly. During this phase, there is still no appearance of condensation drops. In a second phase B, the temperature θ begins to stabilize and drops of condensation appear intermittently. In a third phase C, the temperature θ is substantially stabilized and a regular flow of the condensation drops occurs, it is the active phase of drying. In a fourth phase D, a rise in temperature begins to occur and the flow of the condensation drops becomes intermittent again, the laundry is then partly dry. Finally, in a final phase E, the temperature rise continues, the drops of condensation no longer occur, the laundry is dry.

Le principe de gestion du séchage par le dispositif selon l'invention consiste à mesurer la fréquence d'apparition des gouttes de condensation produites par le séchage et à définir aussi par exemple le moment de séchage, par exemple par une mesure de temps ou de température, et en déduire en fonction de ces paramètres le degré de séchage du linge. Une mesure seule de la fréquence d'apparition des gouttes peut cependant permettre de définir le degré de séchage ou sa fin.The principle of managing the drying by the device according to the invention consists in measuring the frequency of appearance of the condensation drops produced by the drying and also defining, for example, the drying time, for example by measuring time or temperature. , and deduce according to these parameters the degree of drying of the laundry. A single measurement of the frequency of appearance of the drops can however allow the degree of drying or its end to be defined.

La figure 2 présente par un synoptique un dispositif selon l'invention. Ce dernier comporte des moyens 20 de détection des gouttes de condensation, des moyens 21 de mesure de la fréquence d'apparition des gouttes de condensation et par exemple des moyens 22 de détermination du moment de séchage. Ces moyens 22 sont par exemple des moyens de mesure du temps depuis le début du séchage. Un capteur de temps peut être utilisé. Ces moyens 22 peuvent aussi être par exemple un capteur de température de la mesure du linge à l'intérieur du sèche-linge. Les moyens 21, 22 précédents sont reliés à des moyens de traitement 23 constitués par exemple d'un processeur, de mémoires et autres interfaces numériques ou analogiques nécessaires. Les moyens 22 de détermination du moment de séchage peuvent par exemple être intégrés dans les moyens de traitement 23.Figure 2 shows a block diagram of a device according to the invention. The latter comprises means 20 for detecting drops of condensation, means 21 for measuring the frequency of appearance of the drops of condensation and for example means 22 for determining the drying time. These means 22 are for example means for measuring the time since the start of drying. A time sensor can be used. These means 22 can also be, for example, a temperature sensor for measuring the laundry inside the dryer. The means 21, 22 above are connected to processing means 23 consisting for example of a processor, memories and other necessary digital or analog interfaces. The means 22 for determining the drying moment can for example be integrated into the treatment means 23.

Dans le cas où les moyens 22 détermination du moment de séchage sont constitués d'un capteur de temps, l'indication de temps indique a peu près dans quelles phases A, B, C, D ou E décrites précédemment se situe le moment de séchage. Par exemple, pour un temps mesuré court et une absence de gouttes de condensation, le linge est dans la phase A et le séchage n'a pas encore commencé. Pour un temps relativement long et où plus aucune goutte de condensation n'apparaît, les moyens de traitement 23 déterminent une fin de séchage.In the case where the means 22 for determining the drying moment consist of a time sensor, the time indication roughly indicates in which phases A, B, C, D or E described above the drying moment occurs. . For example, for a short measured time and no condensation drops, the laundry is in phase A and drying has not yet started. For a relatively long time and where no more drop of condensation appears, the processing means 23 determine an end of drying.

Dans le cas où les moyens 22 de détermination sont un capteur de température, il est encore possible de définir a peu près la phase de séchage. Comme dans le cas précédent, la mesure de la fréquence des gouttes de condensation permet de conclure définitivement sur le séchage. Il est à noter qu'une mesure seule de température ne permet pas de mesurer précisément le degré de séchage et qu'un traitement de plusieurs mesures de températures est nécessaire. Le dispositif selon l'invention évite notamment la lourdeur associée. Ainsi, une température relativement basse combinée à une absence de gouttes de condensation ou à un débit intermittent de celles-ci permet de conclure que le séchage est à son début, alors qu'une température relativement élevée et un débit intermittent ou une absence de gouttes de condensation permet de conclure à la fin du séchage.In the case where the determination means 22 are a temperature sensor, it is still possible to define roughly the drying phase. As in the previous case, measuring the frequency of the condensation drops makes it possible to conclude definitively on the drying. It should be noted that a temperature measurement alone cannot measure precisely the degree of drying and that a treatment of several temperature measurements is necessary. The device according to the invention notably avoids the associated heaviness. Thus, a relatively low temperature combined with an absence of drops of condensation or an intermittent flow of these makes it possible to conclude that the drying is at its beginning, while a relatively high temperature and an intermittent flow or an absence of drops of condensation makes it possible to conclude at the end of drying.

Dans le cas où les moyens 22 de détermination du moment de séchage sont intégrés dans les moyens de traitement 23, ces derniers mémorisent par exemple les différentes phases successives A, B, C, D, E précédemment décrites grâce aux mesures successives réalisées par les moyens 21 de mesure de la fréquence d'apparition des gouttes de condensation. Ainsi, ces moyens 21 ne détectant plus de gouttes, et ayant précédemment permis la détection des phases A, B, C, D par les mesures de fréquence d'apparition des gouttes de condensation, les moyens de traitement 23 ayant mémorisé l'existence de ces précédentes phases, en déduisent la fin de séchage du linge, c'est à dire la phase E.In the case where the means 22 for determining the drying time are integrated into the treatment means 23, the latter memorize for example the different successive phases A, B, C, D, E previously described thanks to the successive measurements carried out by the means 21 for measuring the frequency of appearance of the drops of condensation. Thus, these means 21 no longer detecting drops, and having previously enabled the detection of phases A, B, C, D by the measurements of frequency of appearance of condensation drops, the processing means 23 having memorized the existence of these previous phases, deduce the end of drying of the laundry, that is to say phase E.

La figure 3 présente un mode de réalisation possible de moyens de détection de gouttes de condensation qui, associés avec un compteur par exemple, permet de détecter la fréquence d'apparition de ces gouttes. Le compteur peut être par exemple intégré dans les moyens de traitement 23. Les moyens de détection sont par exemple constitués d'une thermistance 31 de type CTP, c'est à dire à coefficient de température positif. Ils pourraient tout aussi bien être constitués d'une thermistance à coefficient de température négatif. Cette thermistance a la particularité d'avoir une transition brutale pour un niveau de température donné.FIG. 3 shows a possible embodiment of means for detecting drops of condensation which, associated with a counter for example, makes it possible to detect the frequency of appearance of these drops. The counter can for example be integrated in the processing means 23. The detection means consist for example of a PTC type thermistor 31, that is to say with a positive temperature coefficient. They could just as easily consist of a thermistor with a negative temperature coefficient. This thermistor has the distinction of having a sudden transition for a given temperature level.

La figure 4 illustre cette transition par une courbe caractéristique 41. Cette courbe représente la résistance R de la thermistance en fonction de sa température θ. La thermistance est alimentée par un courant I qui la porte à une température supérieure à celle des gouttes de condensation, le niveau de température de basculement Tb étant supérieur à la température des gouttes. Sur la figure 4, la zone de faible résistance R correspond à une zone froid, en deçà de la température Tb, et la zone de forte résistance R correspond à la zone chaud, au delà de la température de basculement Tb. Entre les deux zones, se situe la zone de basculement 42.FIG. 4 illustrates this transition by a characteristic curve 41. This curve represents the resistance R of the thermistor as a function of its temperature θ. The thermistor is supplied by a current I which brings it to a temperature higher than that of the condensation drops, the switching temperature level T b being higher than the temperature of the drops. In FIG. 4, the zone of low resistance R corresponds to a cold zone, below the temperature T b , and the zone of high resistance R corresponds to the hot zone, beyond the switching temperature T b . Between the two zones, there is the tilting zone 42.

La thermistance 31 est par exemple noyée dans une résine 32. Un fil d'alimentation 33 relie la thermistance à une source de courant 51 comme l'illustre la figure 5.The thermistor 31 is for example embedded in a resin 32. A supply wire 33 connects the thermistor to a current source 51 as illustrated in FIG. 5.

Comme le montre la figure 6, la thermistance 31 enrobée par la résine 32 est placée dans le passage de l'écoulement des gouttes 61. L'écoulement de ces gouttes sur la thermistance 31 fait basculer la température de la thermistance dans sa zone froide de température, en deçà de la température de basculement Tb.As shown in FIG. 6, the thermistor 31 coated with the resin 32 is placed in the passage for the flow of the drops 61. The flow of these drops on the thermistor 31 switches the temperature of the thermistor in its cold zone of temperature, below the switching temperature T b .

La rencontre d'une goutte 61 avec la thermistance 31 fait en effet chuter la température de cette dernière. L'enrobage de résine autour de la thermistance 31 est par exemple le plus mince possible pour faciliter le basculement de température dans un sens et dans l'autre et donc le basculement de la valeur de la résistance de la thermistance 31 dans un sens et dans l'autre. Ceci est en fait possible grâce notamment à la très faible inertie thermique de la thermistance 31 recouverte d'une fine couche de résine.The meeting of a drop 61 with the thermistor 31 makes the temperature of the latter drop. The coating of resin around the thermistor 31 is for example as thin as possible to facilitate the tilting of temperature in one direction and in the other and therefore the tilting of the value of the resistance of the thermistor 31 in one direction and in the other. This is in fact possible thanks in particular to the very low thermal inertia of the thermistor 31 covered with a thin layer of resin.

Des moyens, non représentés mais connus de l'homme du métier, permettent de mesurer la tension Uo aux bornes de la thermistance. Dans la zone froide de la thermistance la tension Uo à ses bornes est très faible car la résistance R est faible, d'où une faible valeur Rl. Dans la zone chaude, la tension Uo est forte en raison de la forte valeur de la résistance R de la thermistance. Un signal binaire fonction de l'apparition des gouttes 61 de condensation est ainsi créé.Means, not shown but known to a person skilled in the art, make it possible to measure the voltage U o across the thermistor. In the cold zone of the thermistor the voltage U o across its terminals is very low because the resistance R is low, hence a low value Rl. In the hot zone, the voltage U o is high due to the high value of the resistance R of the thermistor. A binary signal depending on the appearance of the drops of condensation 61 is thus created.

La fréquence de ce signal binaire est représentative, voire égale, à la fréquence d'apparition des gouttes de condensation.The frequency of this binary signal is representative, even equal, to the frequency of appearance of the drops of condensation.

La figure 7 illustre un tel signal. Ce signal illustré par une courbe 71, est par exemple la tension Uo aux bornes de la thermistance en fonction de la température θ de cette dernière. En fonction de ce signal et notamment de sa fréquence, les moyens de traitement 23 peuvent retrouver les différentes phases A, B, C, D, E de séchage précédemment définies.Figure 7 illustrates such a signal. This signal illustrated by a curve 71, is for example the voltage U o across the thermistor as a function of the temperature θ of the latter. As a function of this signal and in particular of its frequency, the processing means 23 can find the different drying phases A, B, C, D, E previously defined.

En début de séchage, le signal binaire reste par exemple à zéro. La phase de séchage est alors la phase A. Puis le signal passe par intermittence à l'état un, c'est la deuxième phase B. Le débit des gouttes devenant fort et constant, le signal reste continûment à un, c'est la troisième phase de séchage C, la phase active. Puis, le signal 71 repasse de façon intermittente à l'état un, c'est la phase D, le commencement de la fin du séchage. Enfin, le signal 71 retombe définitivement à l'état zéro, c'est la phase E, le séchage est terminé. Un signal de logique binaire opposée pourrait évidemment être utilisé de la même façon.At the start of drying, the binary signal remains, for example, at zero. The drying phase is then phase A. Then the signal passes intermittently to state one, this is the second phase B. The flow rate of the drops becoming strong and constant, the signal remains continuously at one, this is the third drying phase C, the active phase. Then, the signal 71 returns intermittently to state one, this is phase D, the beginning of the end of drying. Finally, the signal 71 definitively drops back to the zero state, it is phase E, the drying is finished. A signal of opposite binary logic could obviously be used in the same way.

La figure 8, illustre par un agrandissement de la courbe 71, le signal binaire dans la phase D. Dans, cette phase, contrairement à la phase B notamment, la fréquence d'apparition des gouttes diminue. Des moyens de mesure du temps entre deux gouttes consécutives permet de détecter cette diminution de fréquence. Ainsi, un arrêt de l'apparition des gouttes de condensation après une diminution de fréquence de cette apparition signifie une fin de séchage que les moyens de traitement peuvent facilement détecter. Par exemple, si au bout d'un temps donné, plus aucune goutte n'apparaît, les moyens de traitement concluent à la fin du séchage.FIG. 8, illustrates by an enlargement of the curve 71, the binary signal in phase D. In this phase, unlike in particular phase B, the frequency of appearance of the drops decreases. Means for measuring the time between two consecutive drops makes it possible to detect this decrease in frequency. Thus, stopping the appearance of the drops of condensation after a reduction in the frequency of this appearance means an end of drying which the processing means can easily detect. For example, if at the end of a given time, no more drop appears, the treatment means conclude at the end of the drying.

D'autres moyens peuvent être utilisés pour la détection des gouttes de condensation. Une diode infrarouge peut par exemple être utilisée en association avec un récepteur infrarouge, les gouttes de condensation passant entre la diode et le récepteur.Other means can be used for the detection of condensation drops. An infrared diode can for example be used in combination with an infrared receiver, the drops of condensation passing between the diode and the receiver.

Ce dernier fournit un signal binaire en fonction du passage des gouttes de condensation donc représentatif du débit de ces dernières provoqué par le séchage.The latter provides a binary signal as a function of the passage of the condensation drops therefore representative of the flow rate of the latter caused by drying.

Claims (10)

Dispositif de mesure du degré de séchage dans un sèche-linge à condenseur, caractérisé en ce qu'il comprend au moins des moyens (20) de détection des gouttes de condensation (61), des moyens (21) de mesure de la fréquence d'apparition de ces gouttes (61) et des moyens de traitement (23) déterminant le degré de séchage en fonction de la fréquence d'apparition des gouttes.Device for measuring the degree of drying in a condenser dryer, characterized in that it comprises at least means (20) for detecting drops of condensation (61), means (21) for measuring the frequency d appearance of these drops (61) and treatment means (23) determining the degree of drying as a function of the frequency of appearance of the drops. Dispositif selon la revendication 1, caractérisé en ce que les moyens (20) de détection comprennent une thermistance (31) alimentée par un courant (I) dont la température de basculement (Tb) est supérieure à la température des gouttes de condensation, la thermistance étant placée dans le passage des gouttes.Device according to claim 1, characterized in that the detection means (20) comprise a thermistor (31) supplied by a current (I) whose switching temperature (T b ) is higher than the temperature of the drops of condensation, the thermistor being placed in the passage of the drops. Dispositif selon la revendication 2, caractérisé en ce que les moyens de détection comprennent de plus des moyens de mesure de la tension aux bornes de la thermistance (31) de façon à délivrer un signal binaire (71) dont la fréquence est représentative de la fréquence d'apparition des gouttes de condensation.Device according to claim 2, characterized in that the detection means further comprises means for measuring the voltage across the thermistor (31) so as to deliver a binary signal (71) whose frequency is representative of the frequency appearance of condensation drops. Dispositif selon la revendication 2, caractérisé en ce que la thermistance (31) est enrobée dans une résine (32).Device according to claim 2, characterized in that the thermistor (31) is coated in a resin (32). Dispositif selon la revendication 3, caractérisé en ce qu'il comprend des moyens pour mesurer le temps entre deux mêmes états consécutifs du signal binaire (71), les moyens de traitement (23) déterminant un arrêt de séchage quand plus aucune goutte n'apparaît après un temps donné.Device according to claim 3, characterized in that it comprises means for measuring the time between two same consecutive states of the binary signal (71), the processing means (23) determining a drying stop when no more drops appear after a given time. Dispositif selon la revendication 1, caractérisé en ce que les moyens (20) de détection comprennent une diode et un récepteur à infrarouge, les gouttes de condensation passant entre la diode et le récepteur, ce dernier délivrant un signal binaire en fonction du passage des gouttes.Device according to claim 1, characterized in that the detection means (20) comprise a diode and an infrared receiver, the drops of condensation passing between the diode and the receiver, the latter delivering a binary signal as a function of the passage of the drops . Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend des moyens (22) de détermination du moment de séchage, le degré de séchage défini étant fonction de la fréquence d'apparition des gouttes (61) de condensation et de ce moment.Device according to any one of the preceding claims, characterized in that it comprises means (22) for determining the drying time, the degree of drying defined being a function of the frequency of appearance of the drops of condensation (61) and from this moment. Dispositif selon la revendication 7, caractérisé en ce que les moyens (22) de détermination du moment de séchage sont constitués d'un compteur de temps.Device according to claim 7, characterized in that the means (22) for determining the drying moment consist of a time counter. Dispositif selon la revendication 7, caractérisé en ce que les moyens (22) de détermination du moment de séchage sont constitués d'un capteur de température à l'intérieur du sèche-linge.Device according to claim 7, characterized in that the means (22) for determining the drying time consist of a temperature sensor inside the dryer. Dispositif selon la revendication 7, caractérisé en ce que les moyens (22) de détermination du moment de séchage sont constitués d'une partie des moyens de traitement (23) mémorisant le déroulement des phases (A, B, C, D, E) de séchage.Device according to claim 7, characterized in that the means (22) for determining the drying moment consist of a part of the processing means (23) memorizing the progress of the phases (A, B, C, D, E) drying.
EP96400075A 1995-01-17 1996-01-12 Device for measuring the drying degree in a laundry drier Ceased EP0723046A1 (en)

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FR9500448 1995-01-17
FR9500448A FR2729470A1 (en) 1995-01-17 1995-01-17 DEVICE FOR MEASURING THE DEGREE OF DRYING IN A DRIER

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US3186106A (en) * 1961-02-06 1965-06-01 Whirlpool Co Drier having flow rate-responsive control means
DE2256404B1 (en) * 1972-11-17 1973-07-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Washer dryer with condensation device arranged in the drying air flow
EP0039645A1 (en) * 1980-05-06 1981-11-11 Thomson-Brandt Laundry dryer with electronic programme control
JPS60176697A (en) * 1984-02-22 1985-09-10 松下電器産業株式会社 Clothing dryer
EP0428846A1 (en) * 1989-09-22 1991-05-29 Asko Cylinda Ab Tumble drier
EP0481561A2 (en) * 1990-10-18 1992-04-22 Whirlpool Europe B.V. Method and apparatus for controlling the drying stage in a clothes dryer, washing machine or the like
GB2265698A (en) * 1992-04-02 1993-10-06 Bosch Siemens Hausgeraete Controlling a drier
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186106A (en) * 1961-02-06 1965-06-01 Whirlpool Co Drier having flow rate-responsive control means
DE2256404B1 (en) * 1972-11-17 1973-07-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Washer dryer with condensation device arranged in the drying air flow
EP0039645A1 (en) * 1980-05-06 1981-11-11 Thomson-Brandt Laundry dryer with electronic programme control
JPS60176697A (en) * 1984-02-22 1985-09-10 松下電器産業株式会社 Clothing dryer
EP0428846A1 (en) * 1989-09-22 1991-05-29 Asko Cylinda Ab Tumble drier
EP0481561A2 (en) * 1990-10-18 1992-04-22 Whirlpool Europe B.V. Method and apparatus for controlling the drying stage in a clothes dryer, washing machine or the like
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FR2729470A1 (en) 1996-07-19

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