EP1113104B1 - Verfahren zur Kontrolle der Wäschetrocknung in einem Wäschetrockner - Google Patents

Verfahren zur Kontrolle der Wäschetrocknung in einem Wäschetrockner Download PDF

Info

Publication number
EP1113104B1
EP1113104B1 EP00403308A EP00403308A EP1113104B1 EP 1113104 B1 EP1113104 B1 EP 1113104B1 EP 00403308 A EP00403308 A EP 00403308A EP 00403308 A EP00403308 A EP 00403308A EP 1113104 B1 EP1113104 B1 EP 1113104B1
Authority
EP
European Patent Office
Prior art keywords
laundry
dryer
door
moisture content
residual moisture
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.)
Expired - Lifetime
Application number
EP00403308A
Other languages
English (en)
French (fr)
Other versions
EP1113104A1 (de
Inventor
André Maziere
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.)
Electrolux Laundry Systems France SNC
Original Assignee
Electrolux Systemes de Blanchisserie SNC
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 Electrolux Systemes de Blanchisserie SNC filed Critical Electrolux Systemes de Blanchisserie SNC
Publication of EP1113104A1 publication Critical patent/EP1113104A1/de
Application granted granted Critical
Publication of EP1113104B1 publication Critical patent/EP1113104B1/de
Anticipated expiration legal-status Critical
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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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/44—Opening, closing or locking of doors
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the invention relates to a method for controlling the proper functioning of a clothes dryer, and in particular the degree of drying of the laundry treated in this dryer.
  • the invention applies to all types of clothes dryer, in which a load of previously washed laundry is introduced in the wet state and comes out in the dry state. It relates in particular to industrial and semi-industrial clothes dryers, used in particular, although not exclusively, in laundries used to treat linen coming from hospital establishments.
  • a load of laundry is heated and brewed for a generally adjustable period of time.
  • a ventilation allows to extract from the appliance the water vapor released by the laundry due to its heating.
  • the state of dryness of the laundry leaving the machine depends on the nature of the textile, on its moisture content when is entered into the machine, the heating temperature and the duration of the treatment.
  • the heating temperature and the operating time of the dryer are manually set by the operator.
  • the latter essentially makes these adjustments as a function of the nature of the textile and of its moisture content at the entrance to the dryer.
  • the state of dryness of the laundry coming out of it is therefore totally dependent on the seriousness, the skill and the experience of the operator.
  • GB-A-2 217 824 describes a tumble dryer with a rotating drum, in which a microwave transmitter is used to dry the laundry placed in the drum.
  • a sensor placed in the air outlet pipe measures the humidity level. This measurement is used to regulate the humidity level so as to keep the level of radiation constant throughout the drying period.
  • the machine program is designed to keep the door lock locked during the drying procedure.
  • the subject of the invention is precisely a process designed to control precisely and reliably the effectiveness of drying the laundry in a clothes dryer, in particular in order to be able to guarantee that the residual humidity level of the laundry treated in this dryer is zero or sufficiently low to avoid rapid development of bacteria possibly present in the laundry.
  • this result is obtained by means of a process for checking the aseptic nature of the laundry in a clotheshorse comprising at least one door, prior to the opening of the minus a door of the clothes dryer, characterized in that it consists in determining the residual moisture content of the laundry inside the dryer, in comparing said rate with a maximum permissible threshold and in issuing an authorization signal d opening of the door when the residual humidity level is below the maximum admissible threshold.
  • the residual moisture content of the laundry is determined continuously.
  • the dryer comprises a metal drum and at least one agitating bucket electrically isolated from this drum
  • the residual moisture content of the laundry is advantageously determined by measuring the electrical resistivity between the bucket and the drum.
  • the maximum admissible threshold is preferably adjustable.
  • said threshold is advantageously at most equal to 2%.
  • the dryer illustrated schematically in the single figure comprises a parallelepipedic envelope 10 in which is housed a metal drum 12, able to rotate about a horizontal axis.
  • Control means housed inside the casing 10 are capable of driving the drum 12 in rotation about its axis with or without reversal of direction.
  • the front face of the casing 10 has a circular opening centered on the axis of the drum. This opening is normally closed by a door 14 able to pivot around a vertical hinge 16. The door 14 is closed by a lock 18.
  • the opening of the door 14 gives access to the interior of the drum 12, in order to introduce therein a load of laundry to be dried or to extract said load from it when the drying cycle is finished.
  • the clothes dryer illustrated schematically in the single figure also includes heating means (not shown) which may be of a nature any (gas, electricity, steam or heat transfer fluid).
  • one or more agitator buckets are placed inside the drum 12 in order to increase the stirring of the laundry and to improve the drying efficiency.
  • one or more humidity sensors 20 are placed inside the drum 12, so as to measure the level of residual moisture present in the laundry contained in the dryer.
  • the humidity sensor 20 can be constituted by a detector capable of measuring the electrical resistivity between the metal drum 12 and one of the agitator buckets (not shown) mounted inside of it.
  • This electrical resistivity detector can then comprise a conductive track formed on an agitator trough electrically insulated from the metal drum 12, as well as one or two coals mounted on the drum so as to rub on this conductive track.
  • humidity sensors 20 such as infrared absorption detectors, sensors measuring the ohmic resistance of the laundry as well as its capacity, etc. can also be used, without departing from the scope of the invention.
  • the residual humidity rate determined by the sensor (s) 20 is measured continuously when the dryer is in operation.
  • the signals delivered by the humidity sensor (s) 20 are transmitted to an electronic circuit 22, which performs a comparison between the residual humidity level measured by the sensor (s) and a maximum admissible threshold for the humidity level of the laundry extract from the dryer.
  • the electronic circuit 22 in which the maximum admissible threshold for the residual moisture content of the laundry leaving the machine is memorized is arranged in such a way that this maximum admissible threshold is adjustable.
  • the maximum admissible threshold for the residual moisture content of the laundry leaving the machine is preferably at most equal to around 2%.
  • an opening authorization signal is issued by this circuit and transmitted to the lock. 18. The operator can then activate this lock in order to open door 14 and extract the load of laundry which has just been treated from the dryer.
  • the opening of the door 14 of the dryer can only be carried out when the residual humidity level of the laundry contained in the dryer is below a maximum admissible threshold. Therefore, the proliferation of bacteria in the laundry extracted from the dryer can be prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (5)

  1. Verfahren zur Kontrolle der aseptischen Eigenschaft der Wäsche in einem Wäschetrockner, der mindestens eine Tür aufweist, vor dem Öffnen der mindestens einen Tür (14) des Wäschetrockners,
       dadurch gekennzeichnet, dass es darin besteht, den Restfeuchtigkeitsgrad der Wäsche im Inneren des Trockners zu bestimmen, den Grad mit einer zulässigen Höchstschwelle zu vergleichen und ein Berechtigungssignal für das Öffnen der Tür (14) auszugeben, wenn der Restfeuchtigkeitsgrad unter der zulässigen Höchstschwelle liegt.
  2. Verfahren nach Anspruch 1, wobei der Restfeuchtigkeitsgrad der Wäsche kontinuierlich bestimmt wird.
  3. Verfahren nach einem der Ansprüche 1 oder 2, wobei der Restfeuchtigkeitsgrad der Wäsche bestimmt wird, indem der spezifische elektrische Widerstand zwischen einer Rührschaufel und einer Trommel (12) des Trockners gemessen wird.
  4. Verfahren nach einem der vorangehenden Ansprüche, wobei die zulässige Höchstschwelle einstell- bzw. regelbar ist.
  5. Verfahren nach einem der vorangehenden Ansprüche, wobei die zulässige Höchstschwelle höchstenfalls 2% beträgt.
EP00403308A 1999-11-30 2000-11-27 Verfahren zur Kontrolle der Wäschetrocknung in einem Wäschetrockner Expired - Lifetime EP1113104B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9915063A FR2801616B1 (fr) 1999-11-30 1999-11-30 Procede de controle du sechage du linge dans un sechoir
FR9915063 1999-11-30

Publications (2)

Publication Number Publication Date
EP1113104A1 EP1113104A1 (de) 2001-07-04
EP1113104B1 true EP1113104B1 (de) 2004-04-28

Family

ID=9552708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00403308A Expired - Lifetime EP1113104B1 (de) 1999-11-30 2000-11-27 Verfahren zur Kontrolle der Wäschetrocknung in einem Wäschetrockner

Country Status (10)

Country Link
US (1) US6378228B1 (de)
EP (1) EP1113104B1 (de)
AT (1) ATE265566T1 (de)
CZ (1) CZ301622B6 (de)
DE (1) DE60010211T2 (de)
DK (1) DK1113104T3 (de)
ES (1) ES2218085T3 (de)
FR (1) FR2801616B1 (de)
PT (1) PT1113104E (de)
TR (1) TR200003471A3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023540515A (ja) * 2020-09-04 2023-09-25 エルジー エレクトロニクス インコーポレイティド 衣類処理装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482143A1 (fr) * 1980-05-06 1981-11-13 Thomson Brandt Seche-linge a programmation electronique
US4781041A (en) * 1984-12-10 1988-11-01 Quadrex Hps, Inc. Apparatus for cleaning garments and soft goods contaminated with nuclear, chemical and/or biological contaminants
GB2217824A (en) * 1988-04-27 1989-11-01 Nicholas Parsons Drying apparatus
JPH02255199A (ja) * 1989-03-29 1990-10-15 Toshiba Corp 乾燥機
US5737852A (en) * 1996-08-05 1998-04-14 White Consolidated Industries, Inc. Dryness control for clothes dryer
US5899005A (en) * 1997-03-13 1999-05-04 General Electric Company System and method for predicting the dryness of clothing articles
US6047486A (en) * 1998-09-03 2000-04-11 Whirlpool Corporation Control system for a dryer
US6020698A (en) * 1998-10-09 2000-02-01 Whirlpool Corporation Timer for use with an electronic control in controlling an appliance
US6199300B1 (en) * 2000-03-01 2001-03-13 Whirlpool Corporation Method for energy efficient control of a dryer of clothes

Also Published As

Publication number Publication date
TR200003471A2 (tr) 2001-07-23
FR2801616A1 (fr) 2001-06-01
CZ20004416A3 (cs) 2001-08-15
EP1113104A1 (de) 2001-07-04
FR2801616B1 (fr) 2002-03-01
US6378228B1 (en) 2002-04-30
PT1113104E (pt) 2004-09-30
DK1113104T3 (da) 2004-08-09
DE60010211D1 (de) 2004-06-03
CZ301622B6 (cs) 2010-05-05
ES2218085T3 (es) 2004-11-16
DE60010211T2 (de) 2005-05-04
ATE265566T1 (de) 2004-05-15
TR200003471A3 (tr) 2001-07-23

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