EP3842587A1 - Wäschetrocknungsmaschine - Google Patents

Wäschetrocknungsmaschine Download PDF

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Publication number
EP3842587A1
EP3842587A1 EP20210344.6A EP20210344A EP3842587A1 EP 3842587 A1 EP3842587 A1 EP 3842587A1 EP 20210344 A EP20210344 A EP 20210344A EP 3842587 A1 EP3842587 A1 EP 3842587A1
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EP
European Patent Office
Prior art keywords
temperature
drum
level
outer environment
value
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
EP20210344.6A
Other languages
English (en)
French (fr)
Other versions
EP3842587B1 (de
Inventor
Erdinc DURAK
Onur ERCAN
Sergen Erkan ARSLAN
Cenkay ZADEOGLU
Mutlu TUNA
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
Application filed by Arcelik AS filed Critical Arcelik AS
Publication of EP3842587A1 publication Critical patent/EP3842587A1/de
Application granted granted Critical
Publication of EP3842587B1 publication Critical patent/EP3842587B1/de
Active legal-status Critical Current
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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
    • D06F58/36—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
    • 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
    • D06F2105/56—Remaining operation time; Remaining operational cycles

Definitions

  • the present invention relates to a laundry dryer enabling the laundry to be dried.
  • washing of the laundry is realized by delivering the heated hot air onto the laundry and transferring humidity in the laundry to the hot air.
  • laundry drying machines art which are known as vented laundry drying machines, the ambient air which is taken from the environment by means of a fan is heated by being passed through a heater and the heated hot air is sent into the drum into which the laundry to be dried is placed. The hot air contacts the laundry in the drum and the humidity in the laundry is transferred to the air.
  • the air which absorbs some of the humidity of the laundry is preferably filtered after leaving the drum and discharged back to the outer environment.
  • the laundry drying machine enables the laundry to be dried by performing the cycle explicated above throughout the drying process.
  • the laundry drying machines comprise humidity sensors which detect the amount of humidity carried by the laundry in the drum to finalize the drying process.
  • Said humidity sensors are preferably arranged so as to have a plate in the front section of the drying machine and measure a resistance value when the wet laundry items contact the plate. Said resistance value increases as the humidity of laundry contacting the plate decreases.
  • a control unit decides whether the drying process must be finalized based on the resistance value measured by the humidity sensor.
  • the drying process is finalized without achieving a homogeneous drying due to the fact that the humidity sensor does not contact each laundry and contacts only some regions of the laundry.
  • the aim of the present invention is the realization of a laundry drying machine which enables the laundry placed into the drum to be dried homogeneously.
  • the laundry drying machine realized in order to attain the aim of the present invention explicated in the first claim and the respective claims thereof, wherein the drying of the laundry in the drum is performed by heating the air taken from the outer environment and passing the same through the drum and discharging the same back to the outer environment, comprises a control unit which is in data communication with a temperature sensor configured to detect the temperature of the air leaving the drum and which is configured to at least approximately determine the temperature of the outer environment and the amount of laundry load in the drum by using at least the temperature value detected by the temperature sensor, and to enable the drying process to be realized based on the detected outer environment temperature level and the load level in the drum.
  • a control unit which is in data communication with a temperature sensor configured to detect the temperature of the air leaving the drum and which is configured to at least approximately determine the temperature of the outer environment and the amount of laundry load in the drum by using at least the temperature value detected by the temperature sensor, and to enable the drying process to be realized based on the detected outer environment temperature level and the load level in the drum.
  • the control unit determines the outer environment temperature level so as to be in three categories for example as “hot environment”, “cold environment” and “medium temperature environment” and determines the load level in the drum so as to be in categories such as “full load”, “low load” and “medium load”.
  • the control unit enables the laundry in the drum to be dried homogeneously by means of preferably a single temperature sensor without the need for a humidity sensor by enabling the drying process to be realized based on at least the detected outer environment temperature level and the detected load level in the drum by determining the temperature of the environment wherein the laundry drying machine is placed and the load level in the drum based on the temperature of the air exiting the drum.
  • control unit is configured to check if the temperature of the air exiting the drum detected by the temperature sensor reaches a target temperature value predetermined by the producer based on the temperature levels of the outer environment and the load levels in the drum after determining the temperature level of the outer environment and the load level in the drum, and to finalize the drying process if, after the control process, it is detected that said target temperature value is reached.
  • the target temperature value predetermined by the producer is a temperature value which enables the humidity of the laundry in the drum to be removed almost completely in the corresponding outer environment temperature level and laundry load level. Said target temperature value is determined preferably by means of experiments performed by the producer.
  • the control unit after determining the outer environment temperature level and the load level in the drum and the corresponding outer environment temperature level and load level in the drum for the target temperature value which is 33 C°, enables the drying process to be finalized when the temperature of the air exiting the drum received from the temperature sensor preferably at certain intervals is greater than or equal to 33 C°.
  • control unit is configured to check if the temperature of the air exiting the drum detected by the temperature sensor has reached a threshold temperature value predetermined by the producer based on the temperature levels of the outer environment and the loads level in the drum after determining the temperature level of the outer environment and the load level in the drum, and if, after the control process, it is detected that said threshold temperature value is reached, to finalize the drying process after a specific time period, wherein said time period is selected from a plurality of time period values predetermined and saved by the producer based on at least the outer environment temperature level and the load level and corresponds to the detected outer environment temperature level and the load level.
  • the target temperature value predetermined by the producer is a temperature value at which the humidity of the laundry in the drum has a specific value such as 10% in the corresponding outer environment temperature level and load level.
  • Said threshold temperature value is determined preferably by means of experiments performed by the producer.
  • the time which has to pass after the threshold temperature value is reached is determined by the producer such that the drying can be performed homogeneously, based mainly on the temperature levels of the outer environment and the load levels in the drum and based on additional parameters such as the drying program type selected by the user and the power supplied to the laundry drying machine.
  • a threshold temperature value of 30 C° is determined for a specific outer environment temperature value and a specific load level and a 400 second time period value is determined for said outer environment temperature level and said load level and saved in the control unit
  • the control unit after determining the outer environment temperature level and the load level in the drum and the corresponding outer environment temperature level and load level in the drum for the threshold temperature value which is 30 C°, enables the drying process to be finalized at the end of a time period of 400 seconds if the temperature of the air exiting the drum is greater than or equal to 30 C °.
  • control unit in order to determine the temperature level of the outer environment, is configured to calculate the average of the temperature values of the air taken from the outer environment for a certain amount of time before the heater is operated, compare the average value of the temperature of the outer environment with at least one first reference temperature value predetermined and saved by the producer, and to select, based on the result of the comparison, the corresponding outer environment temperature category among at least two predetermined categories.
  • the temperature of the environment outside the body is categorized as for example "hot environment”
  • the temperature of the environment outside the body is categorized as for example "cold environment”.
  • the control unit compares the temperature value of the outer environment which is 23 C° and the first reference temperature value which is 24 C° and determines that the average temperature level of the ambient air is less than the first reference temperature value, in other words, that 23 C° is less than 24 C° and categorizes the temperature level of the environment as "cold environment".
  • the control unit compares the temperature value of the outer environment which is 25 C° and the first reference temperature value which is 24 C° and determines that the average temperature value of the ambient air is greater than the first reference temperature value, in other words, that 25 C° is greater than 24 C° and categorizes the temperature level of the environment as "hot environment”.
  • the control unit in order to determine the temperature level of the outer environment, is configured to compare the average of the air temperature values detected for a specific amount of time before the heater is operated and two different reference temperature values predetermined and saved by the producer.
  • the first first reference temperature value is assumed to be greater than the second first reference temperature value
  • the temperature of the outer environment is categorized as "hot environment”
  • the temperature of the outer environment is categorized as "cold environment”
  • the temperature of the outer environment is categorized as "medium temperature environment”.
  • the control unit compares the average temperature value of the outer environment which is 25 C° with the first first reference temperature value which is 30 C° and the second first reference temperature value which is 15C° and determines that the average temperature value of the ambient air is less than the first first reference temperature value, in other words, that 25 C° is less than 30 C° and the average temperature value of the ambient air is greater than the second first reference temperature value, in other words, that 25 C° is greater than 15 C° and categorizes the temperature of the environment as "medium temperature environment".
  • control unit in order to determine the laundry load level in the drum, is configured to determine a second reference temperature value predetermined in relation to the temperature of the outer environment and saved by the producer based on the determined temperature of the outer environment, to calculate the difference between the actual temperature of the air exiting the drum detected by the temperature sensor and said second reference temperature value, to compare the calculated difference with at least one threshold difference value predetermined and saved by the producer and, to categorize, based on the result of the comparison, the amount of load in the drum based on at least two predetermined categories.
  • the temperature of the outer environment can be categorized in two categories, namely "hot environment” and "cold environment”
  • two second reference values related to said categories are determined by the producer and in an exemplary embodiment wherein the temperature of the outer environment can be categorized in three categories, namely "hot environment”, “cold environment” and "medium temperature environment”, three second reference values related to said categories are determined by the producer.
  • the control unit categorizes the amount of load in the drum for example as “low load” if the calculated difference is greater than the threshold difference value, and categorizes the amount of load in the drum for example as “full load” if the calculated difference is smaller than the threshold difference value.
  • a second reference temperature value which is 23 C° corresponding to an outer environment temperature level which is categorized as a "medium temperature environment” and a threshold difference value of 8 C° are determined and the temperature detected by the temperature sensor for example 300 seconds after the heater is activated is calculated as 25 C°, after determining the outer environment temperature level to be "medium temperature environment", the control unit calculates the difference between the actual temperature of the air exiting the drum detected by the temperature sensor after a certain amount of time passes after the heater is activated, in other words, the value of 25 C° detected by the temperature sensor after 300 seconds passes after the heater is activated and the second reference temperature value predetermined by the producer and saved in relation to the temperature of the outer environment, in other words, the value of 23 C° which corresponds to the outer environment temperature level which is "medium temperature environment”, and reaches the value 2 C°.
  • control unit compares the calculated difference value which is 2 C° with the threshold difference value predetermined by the producer which is 8 C°, and determines that the calculated difference is less than the threshold difference, in other words 2 C° is less than 8 C° and categorizes the load level in the drum as "full load”.
  • a first threshold difference value which is 30 C° and a threshold difference value which is 8 C° are determined and the temperature detected by the temperature sensor for example 300 seconds after the heater is activated is calculated as 25 C°, after determining the outer environment temperature level as "medium temperature environment", the control unit calculates the difference between the actual temperature of the air exiting the drum detected by the temperature sensor after a certain amount of time passes after the heater is activated, in other words, the value 25 C° detected by the temperature sensor after 300 seconds passes after the heater is activated and the second reference temperature value predetermined by the producer and saved in relation to the temperature of the outer environment, in other words, the value 23 C° which corresponds to the outer environment temperature level which is "medium temperature environment” and reaches 2 C°.
  • control unit compares the calculated difference value which is 2 C° with the threshold difference value predetermined by the producer which is 8 C° and determines that the calculated difference is less than the threshold difference, in other words 2 C° is less than 8 C° and categorizes the load level in the drum as "low load".
  • control unit in order to determine the load level in the drum, is configured to compare the calculated difference between the actual temperature of the air exiting the drum detected by the temperature sensor a certain amount of time after the heater is activated and said second reference temperature value with two different threshold difference values predetermined and saved by the producer.
  • the control unit after comparing the calculated difference with two threshold difference values predetermined and saved by the producer, the control unit categorizes the amount of load in the drum for example as "low load", if the calculated difference is greater than the first threshold difference value, and categorizes the amount of load in the drum for example as “full load” if the calculated difference is less than the second threshold difference value, and categorizes the amount of load in the drum for example as "medium load” if the calculated difference is less than the first threshold difference value and greater than the second threshold difference value.
  • a second reference temperature value which is 23 C° corresponding to an outer environment temperature level which is categorized as a "medium temperature environment” a first threshold difference value which is 15 C° and a second threshold difference value which is 5 C° are determined and the actual temperature of the air exiting the drum detected by the temperature sensor for example 300 seconds after the heater is activated is calculated as 30 C°
  • the control unit after determining the outer environment temperature level as "medium temperature environment”, calculates the difference between the actual temperature of the air exiting the drum detected by the temperature sensor after a certain amount of time passes after the heater is activated, in other words, the value 30 C° detected by the temperature sensor 300 seconds after the heater is activated and the second reference temperature value predetermined by the producer and saved in relation to the temperature of the outer environment, in other words, the value 23 C° which corresponds to the outer environment temperature level which is "medium temperature environment”, and reaches 7 C°.
  • control unit compares the calculated difference value which is 7 C° with the first threshold difference value and the second threshold difference value predetermined by the producer which are 15 C° and 5 C° respectively and determines that the calculated difference value is less than the first threshold difference value, in other words 7 C° is less than 15 C° and calculated difference value is greater than the second threshold difference value, in other words 7 C° is greater than 5 C° and categorizes the load level in the drum as "medium load”.
  • the control unit enables the drying process to be performed in a controlled manner at least based on the temperature of the environment and the amount of load and thus, enables the laundry to be dried homogeneously preferably by using a single temperature sensor without the need for using a humidity sensor.
  • Figure 1 - is the schematic view of the laundry drying machine of the present invention.
  • the laundry drying machine (1) comprises a body (2); a drum (3) which is positioned in the body (2), which has at least one air inlet opening and an air outlet opening and wherein the drying process is realized; at least one fan (4) which sucks air from the outer environment and directs the same towards the drum (3); at least one heater (5) for heating the ambient air which is sucked before entering the drum (3); a temperature sensor (6) which is configured to detect the temperature of the air exiting the drum (3); and at least one air outlet (7) which enables the air exiting the drum (3) to be discharged from the body (2).
  • the ambient air is sucked from the environment outside the body (2) with the operation of the fan (4), and the ambient air sucked by the fan (4) is sent into the drum (3) after being passed through the heater (5).
  • the hot air which is heated by the heater (5) contacts the laundry in the drum (3) and enables the drying process to be realized by removing the humidity in the laundry.
  • the air humidified in the drum (3) is sent back to the outer environment through the air outlet (7) after passing through the outlet opening of the drum (3).
  • the drying of the laundry placed into the drum (3) is realized by repeating this cycle continuously.
  • the temperature sensor (6) is preferably placed near the air outlet opening of the drum (3) and it is for example, a negative temperature coefficient thermistor (NTC) configured to detect the temperature of the air exiting the drum (3).
  • NTC negative temperature coefficient thermistor
  • the laundry drying machine (1) of the present invention comprises at least one control unit which is connected to the temperature sensor (6) so as to be in data communication with the same and which is configured to estimate the temperature level of the environment outside the body (2) and the load level in the drum (3) using at least the temperature value detected by the temperature sensor (6), and enable the drying process to be realized based on the estimated temperature level of the environment outside the body (2) and the estimated load level in the drum (3).
  • the control unit by estimating the temperature level of the environment wherein the laundry drying machine (1) is placed and the load level in the drum (3), enables the drying process to be realized based on at least these two parameters and thereby, provides a homogeneous drying of the laundry in the drum (3).
  • the control unit is configured to check if the temperature of the air exiting the drum (3) detected by the temperature sensor (6) reaches a target temperature value (T 2 ) predetermined based on the temperature level of the outer environment and the load level in the drum (3) after estimating the temperature level of the outer environment and the load level in the drum and to finalize the drying process if, after the control process, it is detected that said target temperature value (T 2 ) is reached.
  • the target temperature value (T 2 ) is determined as a value which enables the laundry in the drum (3) to be dried almost completely in the drying process which is realized when the temperature level of the environment and the load level in the drum (3) are at corresponding values.
  • the control unit is configured to check if the temperature of the air exiting the drum (3) detected by the temperature sensor (6) has reached a threshold temperature value (T 2' ) predetermined based on the temperature level of the outer environment and the load level in the drum after estimating the temperature level of the outer environment and the load level in the drum (3) and if, after the control process, it is detected that said threshold temperature value (T 2' ) is reached, to finalize the drying process at the end of a specific time period after the threshold temperature value (T 2' ) is reached, wherein said time period is selected from a plurality of time period values predetermined and saved based on at least the outer environment temperature level and the load level and corresponds to the detected outer environment temperature level and the load level in the drum (3).
  • the target temperature value (T 2' ) is determined as a value which enables the laundry in the drum (3) to have a certain amount of humidity in the drying process which is realized when the temperature level of the environment and the load level in the drum (3) are at corresponding values.
  • the time which has to pass after the threshold temperature value (T 2' ) is reached is determined by the producer so that the drying can be performed homogeneously, based mainly on the temperature level of the outer environment and the load level in the drum (3) and based on additional parameters such as the drying program type selected by the user and the power supplied to the laundry drying machine (1).
  • the control unit in order to estimate the temperature level of the environment outside the body (2), is configured to calculate the average temperature (T avg ) of the air taken from the outer environment for a specific amount of time before the heater (5) is activated, compare the average temperature (T avg ) of the outer environment with at least one first reference temperature value (T 1,ref1 ) predetermined and saved by the producer, and to select, based on the result of the comparison, the corresponding outer environment temperature category among at least two predetermined categories.
  • the temperature of the environment outside the body (2) is categorized as for example "hot environment”
  • the temperature of the environment outside the body (2) is categorized as for example "cold environment”.
  • control unit is configured to compare the calculated average temperature value of the outer environment (T avg ) with two different first reference temperature values (T 1,ref1 , T 1,ref2 ) in order to estimate the temperature level of the environment outside the body (2).
  • the temperature of the environment outside the body (2) is categorized as "hot environment"
  • the temperature of the outer environment is categorized as "cold environment” and if the average temperature value of the outer environment (T avg ) is detected to be less than the first first reference temperature
  • the control unit in order to estimate the amount of load in the drum (3), is configured to determine a second reference temperature value (T 2,ref ) predetermined in relation to the temperature of the outer environment and saved by the producer based on the estimated temperature of the outer environment, to calculate the difference ( ⁇ T act ) between the actual temperature of the air (T act1 ) detected by the temperature sensor (6) and said second reference temperature value (T 2,ref ), to compare the calculated difference ( ⁇ T act ) with at least one threshold difference value ( ⁇ T ref1 ) predetermined and saved, and to categorize, based on the result of the comparison, the amount of load in the drum based on at least two predetermined categories.
  • T 2,ref second reference temperature value
  • the load in the drum (3) is categorized as "low load”
  • the load in the drum (3) is categorized as "full load”.
  • control unit in order to estimate the load level in the drum (3), is configured to compare the difference ( ⁇ T act ) between the actual temperature (T act1 ) of the air exiting the drum (3) detected by the temperature sensor (6) and said second reference temperature value (T 2,ref ) with two different threshold difference values ( ⁇ T ref1 , ⁇ T ref2 ).
  • the control unit categorizes the amount of load in the drum (3) for example as "low load”, and if the calculated difference ( ⁇ T act ) is less than the second threshold difference value ( ⁇ T ref2 ) ( ⁇ T act ⁇ ⁇ T ref2 ), categorizes the amount of load in the drum for example as "full load”, and if the calculated difference ( ⁇ T act ) is less than the first threshold difference value ( ⁇ T ref1 ) and greater than the second threshold difference value ( ⁇ T ret2 ) ( ⁇ T ref1 ⁇
  • the control unit enables the drying process to be performed in a controlled manner at least based on the temperature of the environment and the amount of load and thus, enables the laundry to be dried homogeneously.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP20210344.6A 2019-12-24 2020-11-27 Wäschetrocknungsmaschine Active EP3842587B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TR201921367 2019-12-24

Publications (2)

Publication Number Publication Date
EP3842587A1 true EP3842587A1 (de) 2021-06-30
EP3842587B1 EP3842587B1 (de) 2024-01-03

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EP20210344.6A Active EP3842587B1 (de) 2019-12-24 2020-11-27 Wäschetrocknungsmaschine

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EP (1) EP3842587B1 (de)
PL (1) PL3842587T3 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2034086A1 (de) 2007-09-05 2009-03-11 Whirlpool Corporation Haushaltswäschetrockner mit verbesserter Arbeitsgangbeendigung
CN104631073A (zh) * 2013-11-07 2015-05-20 西安道恒交通设备科技有限公司 一种家用衣物自动烘干器
CN107787383A (zh) * 2015-06-26 2018-03-09 伊莱克斯家用电器股份公司 洗涤干燥机中的干燥方法
US10151061B1 (en) * 2017-07-31 2018-12-11 Haier Us Appliance Solutions, Inc. Dryer appliances and methods of operation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2034086A1 (de) 2007-09-05 2009-03-11 Whirlpool Corporation Haushaltswäschetrockner mit verbesserter Arbeitsgangbeendigung
CN104631073A (zh) * 2013-11-07 2015-05-20 西安道恒交通设备科技有限公司 一种家用衣物自动烘干器
CN107787383A (zh) * 2015-06-26 2018-03-09 伊莱克斯家用电器股份公司 洗涤干燥机中的干燥方法
US10151061B1 (en) * 2017-07-31 2018-12-11 Haier Us Appliance Solutions, Inc. Dryer appliances and methods of operation

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PL3842587T3 (pl) 2024-05-20
EP3842587B1 (de) 2024-01-03

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