EP0723046A1 - Dispositif de mesure du degré de séchage dans un sèche-linge - Google Patents

Dispositif de mesure du degré de séchage dans un sèche-linge 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
Other languages
German (de)
English (en)
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
Priority date (The priority date 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 date listed.)
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/fr
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.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP96400075A 1995-01-17 1996-01-12 Dispositif de mesure du degré de séchage dans un sèche-linge Ceased EP0723046A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9500448 1995-01-17
FR9500448A FR2729470A1 (fr) 1995-01-17 1995-01-17 Dispositif de mesure du degre de sechage dans un seche-linge

Publications (1)

Publication Number Publication Date
EP0723046A1 true EP0723046A1 (fr) 1996-07-24

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Application Number Title Priority Date Filing Date
EP96400075A Ceased EP0723046A1 (fr) 1995-01-17 1996-01-12 Dispositif de mesure du degré de séchage dans un sèche-linge

Country Status (2)

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EP (1) EP0723046A1 (xx)
FR (1) FR2729470A1 (xx)

Citations (8)

* 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 (de) * 1972-11-17 1973-07-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Waschetrockner mit im Trocken luftstrom angeordneter Kondensations einrichtung
EP0039645A1 (fr) * 1980-05-06 1981-11-11 Thomson-Brandt Sèche-linge à programmateur électronique
JPS60176697A (ja) * 1984-02-22 1985-09-10 松下電器産業株式会社 衣類乾燥機
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
DE4337735A1 (de) * 1992-11-25 1994-05-26 Miele & Cie Wäschetrockner mit einer Einrichtung zur Erkennung unzulässiger Betriebszustände sowie Verfahren zur Erkennung solcher Betriebszustände

Patent Citations (8)

* 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 (de) * 1972-11-17 1973-07-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Waschetrockner mit im Trocken luftstrom angeordneter Kondensations einrichtung
EP0039645A1 (fr) * 1980-05-06 1981-11-11 Thomson-Brandt Sèche-linge à programmateur électronique
JPS60176697A (ja) * 1984-02-22 1985-09-10 松下電器産業株式会社 衣類乾燥機
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
DE4337735A1 (de) * 1992-11-25 1994-05-26 Miele & Cie Wäschetrockner mit einer Einrichtung zur Erkennung unzulässiger Betriebszustände sowie Verfahren zur Erkennung solcher Betriebszustände

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8542, Derwent World Patents Index; AN 85-261204, XP002000888 *

Also Published As

Publication number Publication date
FR2729470A1 (fr) 1996-07-19
FR2729470B1 (xx) 1997-02-28

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