EP0351276A1 - Verfahren zur Feststellung eines Fehlerzustandes in einem Wäschetrockner und dieses Verfahren anwendender Wäschetrockner - Google Patents

Verfahren zur Feststellung eines Fehlerzustandes in einem Wäschetrockner und dieses Verfahren anwendender Wäschetrockner Download PDF

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Publication number
EP0351276A1
EP0351276A1 EP89401839A EP89401839A EP0351276A1 EP 0351276 A1 EP0351276 A1 EP 0351276A1 EP 89401839 A EP89401839 A EP 89401839A EP 89401839 A EP89401839 A EP 89401839A EP 0351276 A1 EP0351276 A1 EP 0351276A1
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EP
European Patent Office
Prior art keywords
dryer
temperature
air
heating
operating cycle
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.)
Granted
Application number
EP89401839A
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English (en)
French (fr)
Other versions
EP0351276B1 (de
Inventor
Bernard Delhomme
Michel Kubacsi
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 EP0351276A1 publication Critical patent/EP0351276A1/de
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Publication of EP0351276B1 publication Critical patent/EP0351276B1/de
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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
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D06F2105/60—Audible signals
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • 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
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • the present invention relates to a method for detecting faults in a dryer, and a dryer implementing this method.
  • this safety device in a known dryer occurs in most cases without the user being aware of it.
  • the electrical supply to the heating elements or to the motors is automatically cut off due to overheating and restored after they have cooled down, no information of these incidents is clearly brought to the attention of the user.
  • a user who was not present at the time of these incidents can hardly be aware of the malfunction of this dryer and continues to use it in poor conditions which risk causing damage to the constituent parts.
  • the object of the present invention to avoid these drawbacks is an efficient and economical method for detecting and identifying faults in a dryer. It also relates to a dryer implementing this process. The dryer signals faults that have occurred and controls its operation accordingly.
  • a method for detecting faults in a dryer provided with a clothes drum, electric heating resistors and an air circulation fan is characterized in that it comprises temperature measurements of air at the air outlet duct and at predetermined times in the operating cycle of this dryer, determination of the values of the measured temperature variations, and identification of faults by selective recognition of the values abnormal these temperature variations taking into account these instants of measurement of these temperatures, in the dryer operating cycle
  • the invention is applicable both to tumble dryers where the air leaving their laundry drum is discharged outside, and to tumble dryers in which the air leaving their laundry drum is recycled. i.e. dehumidified and then returned to their drying air circuit.
  • an exemplary embodiment of it is described below, illustrated by a single appended drawing annexed schematically and partially to a dryer where the air leaving its washing drum is evacuated outside.
  • the dryer 1 illustrated comprises a rotary laundry drum 2, an air inlet duct 3 for a stream of drying air conveyed by a fan 4 and heated, to a predetermined temperature, by electric heating resistors 5 , an air outlet duct 6 provided with a filter 7 which retains in particular linen fluff.
  • the laundry drum 2 is rotated by an electric motor 8.
  • the drum 2 rotates and lifts the laundry to be dried 9 while a stream of hot air at a predetermined temperature 10 is sent through the air intake duct 3 in drum 2 to dry the laundry.
  • the air 11 leaving the laundry drum 2 being cooled air and charged with humidity, is guided by the air outlet duct 6 to be evacuated to the outside.
  • a method for detecting faults in a dryer comprises measurements of the air temperatures at the level of the air outlet duct of the dryer and at times. of the operating cycle of this dryer, a determination of the values of the variations in the measured temperatures, and an identification of faults by a selective recognition of the abnormal values of these variations in temperature taking into account these instants of measurement of these temperatures in the dryer operating cycle.
  • the air temperature at the outlet duct 6 rises rapidly, during a first phase where the wet laundry and the mechanical structure of the dryer are heated from a relatively low initial outlet temperature (Ti) ( ⁇ 25 ° C) or after an initial temperature drop to a minimum (Tmin) up to an equilibrium temperature (Te) corresponding to the start of a second phase or phase of water extraction during which the temperature follows a slow rise to a value Tf from which the temperature rises again rapidly in a third phase or phase of overdrying.
  • Ti initial outlet temperature
  • Tmin minimum
  • Te equilibrium temperature
  • the invention are carried out at the air outlet duct 6 and in the first phase or initial phase of the operating cycle of the dryer 1, measurements of a minimum detected air temperature Tmin, d '' an air temperature Ti at a predetermined instant ti, of the order of six to twelve minutes after the detection of Tmin, of an air temperature T 2 at a predetermined instant t 2 of the order of ten minutes after the measurement of T 1 , and of the determinations of the values of the temperature variations Ti - Tmin and T 2 - Ti.
  • T 1 - Tmin is positive but less than approximately Tv (O ⁇ T 1 - Tmin ⁇ Tv)
  • this rise in temperature is abnormally low and indicates either a heavy load of damp cloth to be dried in the drum 2 or a too low electrical supply voltage to the heating resistors 5, ie a ventilation fault caused by a stop or blockage of the fan 4.
  • the heated air is not in a normal circulation state, the rise in temperature in the duct input 10 is fast and the thermal protection relay for the heating resistors 5 operates and automatically cuts off the electrical supply to the latter.
  • the temperature of the air in the air outlet duct 6 rises slightly from A Tv, ⁇ Tv depending on the type of dryer and being approximately 3 to 5 ° C between Ti and Tmin and then slowly decreases. These two cases are distinguished from each other by an examination of the temperature variation T 2 -T 1 .
  • T 2 -T 1 is positive (T 2 -T 1 > 0)
  • this normal temperature increase indicates that either the drying air returns to normal circulation in the dryer 1 after a stagnant start due to a temporary barrier constituted by an excessive load of laundry in the drum 2 (0 ⁇ Ti - Tmin ⁇ Tv) or the mains voltage is low and that consequently the operation of the dryer 1 is normal.
  • T 2 - Ti is negative or zero (T 2 - T 1 ⁇ O) this abnormal drop in temperature confirms a ventilation fault caused by the fan 4 stopping (0 ⁇ Ti - Tmin ⁇ Tv).
  • the measurements of Ti - Tmin and T 2 - T 1 make it possible to identify a heating failure (Ti - Tmin ⁇ 0) a ventilation fault caused by a blockage or an unexpected shutdown of fan 4 (0 ⁇ Ti - Tmin ⁇ Tv and T 2 - Ti ⁇ 0) in the first phase of a tumble dryer operating cycle.
  • a heating failure Ti - Tmin ⁇ 0
  • a ventilation fault caused by a blockage or an unexpected shutdown of fan 4 (0 ⁇ Ti - Tmin ⁇ Tv and T 2 - Ti ⁇ 0
  • the invention are also carried out at the air outlet duct 6 and during the operating cycle of the dryer 1 air temperature measurements Tj periodically every tn seconds where tn is l 'order of several seconds, and determinations of the values of the temperature variations Tj - T (j - 1).
  • Tj - T (j - 1) is negative, this abnormal drop in temperatures indicates either a momentary poor circulation of the drying air due to a temporary barrier consisting of moving laundry occupying in the drum 2 an obstruction arrangement. , either an opening of the dryer door leading to the operation of a safety relay which cuts the heating, or a normal phase of cooling of the linen triggered after the moment when a final humidity threshold H of the selected linen is reached either a heating failure or an obstruction of the air outlet duct 6.
  • the identification is made by scanning the state of a door microswitch, this microswitch being open if the door is open and in the case of a normal cooling phase. the identification follows from the determination of the reaching of the final humidity threshold H controlled by the dryer control circuit.
  • an air temperature T 3 is carried out after a time t 3 of the order of fifteen minutes (typical of the dryer in question) after a cut in the heating circuit and maintenance of the ventilation, then a temperature T 4 of the air is measured after a time t 4 approximately five minutes (typical of the dryer in question) after a reclosure of the heating circuit and finally a variation T 4 - T 3 is determined.
  • T 4 - T 3 is negative or zero (T 4 - T 3 5 0), it is a heating failure.
  • T 4 - T 3 is positive (T 4 - T 3 > 0), the air outlet duct 6 is obstructed.
  • Tj - T (j - 1), and T 4 - T 3 allow identification of heating failure and obstruction of the air outlet duct 6 during an operating cycle of the dryer 1.
  • Ts being the safety temperature, for example 70 ° C, if Ts -Ts is abnormally positive or zero (T 5 -Ts ⁇ O) or if for a minimum duration of two minutes for example, this indicates a failure of the heating not to be interrupted, because the heating is always on although the electric supply of the heating resistors 5 must be cut by the programmer of the dryer 1 which goes into the laundry cooling phase or the last phase of the dryer operating cycle, the drying phase having ended.
  • This signaling can be carried out by light or sound means or clear display means.
  • the dryer 1 comprises indicator lights, not shown, constituted by diodes to indicate or display the operation or the stopping of the line dryer 1 and / or of its organs and the nature of the faults detected.
  • indicator lights not shown, constituted by diodes to indicate or display the operation or the stopping of the line dryer 1 and / or of its organs and the nature of the faults detected.
  • three aligned diodes 21, 22, 23 were used for displaying the detected faults.
  • the selected operating program is interrupted by the control circuit 15 which stops the dryer -line because it is useless to leave the appliance running without heating, and this heating failure is indicated by lighting of the first two 21 and 22 of the three diodes, represented in a / in FIG. 2.
  • the control circuit 15 cuts the electrical supply to the heating resistors 5 or stops the dryer to prevent overheating and repetitive operation of these under the control of its thermal safety relay, and signals this failure by lighting two end diodes 21, 23 of the three diodes shown in b / in FIG. 2.
  • control circuit 15 can signal this situation by illumination of the last two 22 and 23 of the three diodes, represented in c / in FIG. 2.
  • control circuit 15 cuts the electrical supply to the heating resistors 5 or stops the dryer 1 and signals this failure by lighting the three diodes 21, 22, 23 shown in d / in Figure 2.
  • control circuit 15 keeps the fan 4 operating even after the end of the normal laundry cooling phase. to avoid any damage to the laundry by an excessively high temperature, and signals this failure of non-interruption of the heating by a flashing of the three diodes 21, 22, 23 shown in e / in FIG. 2.
  • the operational safety of the dryer 1 of the invention is thus achieved in a more advanced manner than that of known dryers, which not only makes it possible to effectively put the laundry 9 away from any damage from thermal origin but also to obtain an appreciable economy by a rational use of the device, and a good drying result.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP89401839A 1988-07-13 1989-06-27 Verfahren zur Feststellung eines Fehlerzustandes in einem Wäschetrockner und dieses Verfahren anwendender Wäschetrockner Expired - Lifetime EP0351276B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809549A FR2634232B1 (fr) 1988-07-13 1988-07-13 Procede de detection de pannes dans un seche-linge et seche-linge mettant en oeuvre ce procede
FR8809549 1988-07-13

Publications (2)

Publication Number Publication Date
EP0351276A1 true EP0351276A1 (de) 1990-01-17
EP0351276B1 EP0351276B1 (de) 1992-08-05

Family

ID=9368425

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401839A Expired - Lifetime EP0351276B1 (de) 1988-07-13 1989-06-27 Verfahren zur Feststellung eines Fehlerzustandes in einem Wäschetrockner und dieses Verfahren anwendender Wäschetrockner

Country Status (3)

Country Link
EP (1) EP0351276B1 (de)
DE (1) DE68902371T2 (de)
FR (1) FR2634232B1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483731A3 (en) * 1990-10-27 1992-08-05 Zanker Gmbh Drier and method to monitor the temperature of a drier
EP0512940A1 (de) * 1991-05-07 1992-11-11 Nyborg Vaskerimaskiner A/S Wäschetrockner
EP0889155A1 (de) * 1997-07-02 1999-01-07 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Erkennung unzulässiger Betriebszustände in einem Warmluft-Wäschetrockner sowie Wäschetrockner mit einem solchen Erkennungsverfahren
WO2007049190A1 (en) * 2005-10-25 2007-05-03 Arcelik Anonim Sirketi A dryer
EP1736592A3 (de) * 2005-06-23 2008-04-16 Whirlpool Corporation Automatischer Wäschetrockner
WO2008043705A1 (de) * 2006-10-09 2008-04-17 BSH Bosch und Siemens Hausgeräte GmbH Wäschetrockner mit einer anzeigevorrichtung zur anzeige eines verschmutzungsgrades
US20100192404A1 (en) * 2009-01-30 2010-08-05 Antonino Maltese Clothes dryer fire safeguard circuit with energized relay cutoffs
US7858907B2 (en) 2005-04-29 2010-12-28 Bsh Bosch Und Siemens Hausgeraete Gmbh Electric switching circuit for a clothes dryer
CN101400846B (zh) * 2006-03-09 2011-01-26 Lg电子株式会社 烘干机的控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008016629A1 (de) * 2008-04-01 2009-10-08 BSH Bosch und Siemens Hausgeräte GmbH Schaltungsanordnung zum Betreiben eines Hausgeräts und entsprechendes Verfahren
CN113882130B (zh) * 2020-07-02 2023-09-22 重庆海尔滚筒洗衣机有限公司 热泵式衣物烘干设备的故障检测方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2424352A1 (fr) * 1978-04-28 1979-11-23 Mallory & Co Inc P R Appareil de sechage, et dispositif et procede de commande de cet appareil
GB2034451A (en) * 1978-10-19 1980-06-04 Junga Verkstaeder Ab Tumbler dryer
US4531307A (en) * 1983-12-27 1985-07-30 The Maytag Company Fabric dryer control with cycle interrupt
DE3436342A1 (de) * 1984-10-04 1986-04-10 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Waeschetrockner oder waschtrockner
GB2210485A (en) * 1987-09-21 1989-06-07 Hotpoint Ltd Tumble dryer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2424352A1 (fr) * 1978-04-28 1979-11-23 Mallory & Co Inc P R Appareil de sechage, et dispositif et procede de commande de cet appareil
GB2034451A (en) * 1978-10-19 1980-06-04 Junga Verkstaeder Ab Tumbler dryer
US4531307A (en) * 1983-12-27 1985-07-30 The Maytag Company Fabric dryer control with cycle interrupt
DE3436342A1 (de) * 1984-10-04 1986-04-10 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Waeschetrockner oder waschtrockner
GB2210485A (en) * 1987-09-21 1989-06-07 Hotpoint Ltd Tumble dryer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483731A3 (en) * 1990-10-27 1992-08-05 Zanker Gmbh Drier and method to monitor the temperature of a drier
EP0512940A1 (de) * 1991-05-07 1992-11-11 Nyborg Vaskerimaskiner A/S Wäschetrockner
EP0889155A1 (de) * 1997-07-02 1999-01-07 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zur Erkennung unzulässiger Betriebszustände in einem Warmluft-Wäschetrockner sowie Wäschetrockner mit einem solchen Erkennungsverfahren
US7858907B2 (en) 2005-04-29 2010-12-28 Bsh Bosch Und Siemens Hausgeraete Gmbh Electric switching circuit for a clothes dryer
EP1736592A3 (de) * 2005-06-23 2008-04-16 Whirlpool Corporation Automatischer Wäschetrockner
US8015726B2 (en) 2005-06-23 2011-09-13 Whirlpool Corporation Automatic clothes dryer
WO2007049190A1 (en) * 2005-10-25 2007-05-03 Arcelik Anonim Sirketi A dryer
CN101400846B (zh) * 2006-03-09 2011-01-26 Lg电子株式会社 烘干机的控制方法
WO2008043705A1 (de) * 2006-10-09 2008-04-17 BSH Bosch und Siemens Hausgeräte GmbH Wäschetrockner mit einer anzeigevorrichtung zur anzeige eines verschmutzungsgrades
US20100192404A1 (en) * 2009-01-30 2010-08-05 Antonino Maltese Clothes dryer fire safeguard circuit with energized relay cutoffs

Also Published As

Publication number Publication date
DE68902371D1 (de) 1992-09-10
FR2634232B1 (fr) 1993-03-26
DE68902371T2 (de) 1992-12-10
FR2634232A1 (fr) 1990-01-19
EP0351276B1 (de) 1992-08-05

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