EP2229476B1 - Trockner - Google Patents

Trockner Download PDF

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Publication number
EP2229476B1
EP2229476B1 EP08861698.2A EP08861698A EP2229476B1 EP 2229476 B1 EP2229476 B1 EP 2229476B1 EP 08861698 A EP08861698 A EP 08861698A EP 2229476 B1 EP2229476 B1 EP 2229476B1
Authority
EP
European Patent Office
Prior art keywords
temperature
heater
drying air
rate
drum
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.)
Active
Application number
EP08861698.2A
Other languages
English (en)
French (fr)
Other versions
EP2229476A1 (de
Inventor
Arif Ozarslan
Hakan Ozkahraman
Ertan Cetinkaya
Sinan Sekban
Murat Goktas
Safak Tezcan
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.)
Arcelik AS
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Arcelik AS
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Publication date
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Publication of EP2229476A1 publication Critical patent/EP2229476A1/de
Application granted granted Critical
Publication of EP2229476B1 publication Critical patent/EP2229476B1/de
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    • 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
    • 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
    • D06F2105/28—Electric heating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user

Definitions

  • the present invention relates to a dryer wherein the malfunctions that occur during the drying process are identified.
  • malfunctions can occur such as clogging of the filter and condenser, obstruction of the air passageway, the motor locking up and not rotating the drum or the drying air blower, the blower dislodging from the motor shaft, the drum getting jammed and being forced in rotating or decrease in the mains voltage. Not being able to detect these malfunctions correctly in due time results in the decrease of the drying performance and damaging of the laundry.
  • the malfunctions of the dryer generally interrupt or considerably limit the flow of the drying air, moreover the temperature of the drying air increases excessively.
  • the temperature of the heater used in the dryer is kept under control by security elements such as NTC, thermostat, or thermal protector. Under normal working conditions, the heater operates within a certain temperature range under control of the NTC or the thermostat.
  • the heater thermostat de-energizes the heater at the set high temperature limit; however, the temperature continues rising for a while due to thermal inertia.
  • the non-return thermal protector used for the last safety precaution in heaters is actuated against excessive temperature rise and stops the operation of the heater. The actuation of the non-return thermal protector is an unwanted situation and the heater can only be energized again after repair by the service.
  • the motor that activates the drum containing the laundry and the blower activating the drying air is protected against excessive heating by a motor thermal protector; however, in case of an error it takes time for the motor thermal protector to be energized and hot air is sent over the laundry as long as the motor operates.
  • the heating of the dryer is turned off and/or an operating state display is activated.
  • the aim of the present invention is the realization of a dryer wherein the malfunctions that occur during the drying process and partially or entirely obstruct air flow in the drum can be detected.
  • the dryer realized in order to attain the aim of the present invention is explicated in the claims.
  • the laundry is emplaced in a drum actuated by a motor and the drying air, activated by a blower, heated by a heater and circulated in the circulation channel between the blower and the drum, is blown over the laundry.
  • the temperature variations of the drying air are detected by means of a temperature sensor disposed in the circulation channel and whether or not there is a malfunction that partially or entirely prevents air flow in the drum and what type of a malfunction there is and if there is one identified with the evaluation of the temperature change rate of the drying air by the control unit are detected.
  • the temperature sensor integrated with the thermostat or as a separate unit, is disposed close to the heater or at a point farther away.
  • the control unit evaluates the derivative of the heater temperature change according to time, or in other words, the control unit evaluates the temperature change rate for identifying which malfunction is confronted with during operation of the dryer, such as locking of the motor, the blower not rotating, clogging of the filter or the condenser, the drum rotating with difficulty and dropping of voltage or jamming of the drum.
  • the rate of change in temperature of the drying air is evaluated by the control unit for determining whether there is malfunction and the type of malfunction if there is one.
  • the rate of increase in temperature of the drying air is evaluated by the control unit.
  • the rate of decrease in temperature of the drying air is evaluated by the control unit.
  • the dryer (1) comprises a drum (2) wherein the laundry is emplaced, a motor (3) that actuates the drum (2) to enable its rotation, a blower (4) for circulating the air in the drying cycle, a circulation channel (5) wherein the drying air circulates, a filter for removing the fibers circulating in the drying air, a condenser for removing the moisture in the drying air, a heater (6) disposed in the circulation channel (5) for heating the drying air and a thermostat (9) for operating the heater (6) on and off and heating and cooling within a certain temperature range (Tcut-on - Tcut-off).
  • the dryer (1) of the present invention comprises the features of claim 1.
  • the control unit (8) decides that a malfunction has occurred according to the magnitude of the difference between the detected and reference temperature change rate ((dT1/dt) - (dT/dt)) and determines which malfunction is confronted with such as locking of the motor (3), the blower (4) not rotating, clogging of the filter or the condenser that entirely prevent air flow in the drum (2), the drum (2) rotating with difficulty or dropping of voltage that partially prevent air flow in the drum (2).
  • the temperature sensor (7) is disposed in the vicinity of the heater (6) in the circulation channel (5) and detects the drying air temperature (T1) in the vicinity of the heater (6). If there is malfunction that prevents or limits air flow, the drying air temperature (T1) in the vicinity of the heater (6) rises rapidly since there is insufficient air flow for cooling the heater (6) and the rapid increase (dT1/dt), in the drying air temperature (T1) is detected by the temperature sensor (7) and evaluated by the control unit (8).
  • the temperature sensor (7) is disposed at a point farther away from the heater (6), e.g. at the exit of the drum (2) and detects the drying air temperature (T1).
  • a simple, calibrated temperature sensor (7) is used without being directly affected by the heater (6) temperature. For example, the temperature value detected by the temperature sensor (7) is multiplied by a coefficient to calculate the drying air temperature (T1).
  • control unit (8) evaluates the rate of increase (dT1/dt) in the drying air temperature (T1) and compares the temperature rate of increase (dT1/dt) with the reference temperature increase rate (dT/dt) when the heater (6), operating in on and off under control of the thermostat (9), is in the on mode and while the drying air temperature (T1) in the vicinity of the heater (6) is increasing from the set low temperature (Tcut-on) to the set high temperature (Tcut-off) of the thermostat (9) for deciding whether there is malfunction that prevents or limits air flow and the type of malfunction if there is one ( Figure 2 ).
  • the control unit (8) evaluates the rate of increase (dT1/dt) in the drying air temperature (T1) and compares the temperature rate of increase (dT1/dt) with reference temperature increase rate (dT/dt) for deciding whether there is malfunction that prevents or limits air flow and the type of malfunction if there is one ( Figure 3 ).
  • the temperature of the drying air (T1) in the vicinity of the heater (6) increases slower due to effect of thermal inertia and after a short while the temperature rise stops and cooling begins.
  • the control unit (8) evaluates the rate of decrease (dT1/dt) in drying air temperature (T1) in the vicinity of the heater (6), and compares the temperature decrease rate (dT1/dt) with the reference temperature decrease rate (dT/dt) for deciding whether there is malfunction that prevents or limits air flow and the type of malfunction if there is one ( Figure 4 ).
  • the drying air temperature (T1) in the vicinity of the heater (6) rapidly drops since the desired air flow over the heater (6) is provided and cooling down is slower when there is a malfunction that entirely or partially obstructs air flow since there will be an insufficient air flow over the heater (6).
  • the temperature sensor (7) is disposed in the vicinity of the heater (6), furthermore the temperature sensor (7) is integrated with the thermostat (9) and both operate as a single unit thereby less space is occupied.
  • the temperature sensor (7) - thermostat (9) unit besides detecting the rate of increase (dT1/dt) in the drying air temperature (T1) for evaluation by the control unit (8), the heater (6) is enabled to operate on and off within a range of low temperature (Tcut-on) and high temperature (Tcut-off).
  • the heater (6) when in the off mode, is not operated even if an actuating signal is received from the thermostat (9) and kept waiting for a while, and after the waiting time the heater (6) is restarted and the rate of change (dT1/dt) in the drying air temperature (T1) is evaluated, controlling whether or not the voltage drop failure is over.
  • the motor (3) is also turned off besides the heater (6) and kept waiting for a while and afterwards the heater (6) and the motor (3) are restarted for controlling whether or not the failure is over.
  • the control unit (8) evaluating the rate of change (dT1/dt) in the drying air temperature (T1), the heater (6) is turned off for a while and during this time the motor (3) is rotated to the left and right for opening the drum (2) jam.
  • the control unit (8) After waiting by turning off the heater (6) and the motor (3) or operating the motor (3) by rotating to the right and left, if the control unit (8) detects that the malfunctions are repeating as a result of evaluating the rate of change (dT1/dt) in the drying air temperature (T1), the energy delivered to all the components is cut off, the dryer (1) is changed to malfunction mode and the user is warned by elements like the follower LED flashing on and off.
  • the malfunctions encountered during operation are identified with the temperature sensor (7) disposed in the circulation channel (5) and by the control unit (8) that evaluates the data received from the temperature sensor (7) and preventive measures are taken for avoiding discoloration and damage in the laundry.

Landscapes

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

Claims (5)

  1. Trockner (1), der Folgendes umfasst
    - eine Trommel (2), in die die Wäsche gegeben wird,
    - einen Motor (3), der die Trommel (2) betätigt, um sie zu drehen,
    - ein Gebläse (4) zum Zirkulieren der Luft im Trocknungszyklus,
    - einen Zirkulationskanal (5), in dem die Trocknungsluft zirkuliert,
    - eine Heizeinrichtung (6), die im Zirkulationskanal (5) angeordnet ist, um die Trocknungsluft zu erwärmen,
    - ein Thermostat (9) zum Aktivieren und Deaktivieren der Heizeinrichtung (6) und zum Erwärmen und Kühlen innerhalb eines bestimmten Temperaturbereichs (Tcut-on - Tcut-off),
    - einen Temperatursensor (7), der in der Nähe der Heizeinrichtung (6) im Zirkulationskanal (5) angeordnet ist und die Temperatur (T1) der Trocknungsluft (T1) in der Nähe der Heizeinrichtung (6) misst, und
    - eine Steuereinheit (8), die dazu konfiguriert ist, die Änderungswerte der Temperatur (T) der Trocknungsluft in Bezug auf die Zeit (t) bei normaler Strömung zu bestimmen und diese als Referenz (ref = Temperatur (T) - Zeit (t) Graph) im Speicher aufzuzeichnen, ferner dazu konfiguriert ist, die vom Temperatursensor (7) gemessene Temperaturänderungsrate (dT1/dt) der Trocknungsluft mit der Referenztemperaturänderungsrate (dT/dt) zu vergleichen und zu entscheiden, dass eine Störung vorliegt, die die Luftströmung in der Trommel einschränkt, wenn die gemessene Rate (dT1/dt) der Temperaturänderung der Trocknungsluft sich von der Referenztemperaturänderungsrate (dT/dt) unterscheidet,
    dadurch gekennzeichnet, dass
    die Steuereinheit (8) dazu konfiguriert ist, die Anstiegsrate (dT1/dt) der Trocknungslufttemperatur (T1) zu beurteilen, wenn die Heizeinrichtung (6), die unter Steuerung des Thermostat (9) aktiviert und deaktiviert wird, im deaktivierten Zustand ist, und während die Trocknungslufttemperatur (T1) in der Nähe der Heizeinrichtung (6) aufgrund von Wärmeträgheit ansteigt.
  2. Trockner (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (8) dazu konfiguriert ist, anhand der Größe der Differenz ((dT1/dt) - (dT/dt)) zwischen der gemessenen Rate der Temperaturänderung und der Referenztemperaturänderungsrate zu bestimmen, mit welcher Störung sie konfrontiert wird, etwa einem Blockieren des Motor (3), einem nicht drehenden Gebläse (4), einer Verstopfung des Filters oder des Kondensators, die einen Luftstrom in der Trommel (2) vollständig verhindert, Schwierigkeiten beim Drehen der Trommel (2) oder Abfall der Spannung, die den Luftstrom in der Trommel (2) teilweise verhindern.
  3. Trockner (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Steuereinheit (8) dazu konfiguriert ist, die Anstiegsrate (dT1/dt) der Trocknungslufttemperatur (T1) zu beurteilen, wenn die Heizeinrichtung (6), die unter Steuerung des Thermostat (9) aktiviert und deaktiviert wird, im aktivierten Zustand ist, und während die Trocknungslufttemperatur (T1) in der Nähe der Heizeinrichtung (6) von der eingestellten niedrigen Temperatur (Tcut-on) zur eingestellten hohen Temperatur (Tcut-off) des Thermostats (9) ansteigt.
  4. Trockner (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Steuereinheit (8) dazu konfiguriert ist, die Anstiegsrate (dT1/dt) der Trocknungslufttemperatur (T1) zu beurteilen, wenn die Heizeinrichtung (6), die unter Steuerung des Thermostat (9) aktiviert und deaktiviert wird, im deaktivierten Zustand ist, und während die Trocknungslufttemperatur (T1) in der Nähe der Heizeinrichtung (6) aufgrund von Wärmeträgheit ansteigt.
  5. Trockner (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Steuereinheit (8) dazu konfiguriert ist, die Abnahmerate (dT1/dt) der Trocknungslufttemperatur (T1) in der Nähe der Heizeinrichtung (6) zu beurteilen, wenn die Heizeinrichtung (6), die unter Steuerung des Thermostat (9) aktiviert und deaktiviert wird, im deaktivierten Zustand ist, und während die Heizeinrichtung (6) sich nach dem Ende der Wirkung der Wärmeträgheit in der Kühlphase befindet.
EP08861698.2A 2007-12-17 2008-11-27 Trockner Active EP2229476B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR200708761 2007-12-17
PCT/EP2008/066328 WO2009077301A1 (en) 2007-12-17 2008-11-27 A dryer

Publications (2)

Publication Number Publication Date
EP2229476A1 EP2229476A1 (de) 2010-09-22
EP2229476B1 true EP2229476B1 (de) 2016-12-21

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Application Number Title Priority Date Filing Date
EP08861698.2A Active EP2229476B1 (de) 2007-12-17 2008-11-27 Trockner

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EP (1) EP2229476B1 (de)
ES (1) ES2618342T3 (de)
WO (1) WO2009077301A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8555522B2 (en) 2010-10-21 2013-10-15 Whirlpool Corporation Laundry treating appliance with inlet temperature compensation
WO2013050262A1 (en) * 2011-10-04 2013-04-11 Arcelik Anonim Sirketi Heat pump laundry dryer
KR102012455B1 (ko) * 2012-03-30 2019-08-21 삼성전자주식회사 건조기 및 그 막힘 검출 방법
DE102013108783A1 (de) * 2013-08-14 2015-02-19 Miele & Cie. Kg Verfahren zum Erkennen einer wenigstens teilweisen Verstopfung eines Prozessluftkanals in einem Trockner
WO2021187875A1 (ko) * 2020-03-16 2021-09-23 엘지전자 주식회사 의류처리장치
CN114622380B (zh) * 2020-12-11 2024-03-26 广州视源电子科技股份有限公司 烘干风机的检测方法、装置及存储介质

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6150599A (ja) * 1984-08-18 1986-03-12 松下電器産業株式会社 乾燥機の制御装置
DE19728197A1 (de) * 1997-07-02 1999-01-07 Bosch Siemens Hausgeraete Verfahren zur Erkennung unzulässiger Betriebszustände in einem Wäschetrockner sowie Wäschetrockner mit einem solchen Erkennungsverfahren
DE10025205C1 (de) * 2000-05-20 2001-09-06 Miele & Cie Verfahren zum sicheren Betrieb eines Wäschetrockners
US6995965B2 (en) * 2002-12-12 2006-02-07 General Electric Company Clothes dryer over-voltage control apparatus and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2229476A1 (de) 2010-09-22
ES2618342T3 (es) 2017-06-21
WO2009077301A1 (en) 2009-06-25

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