EP2770102B1 - Verfahren zum Trocknen von Wäsche in einem Wäschetrockner und Wäschetrockner zur Durchführung des besagten Verfahrens - Google Patents
Verfahren zum Trocknen von Wäsche in einem Wäschetrockner und Wäschetrockner zur Durchführung des besagten Verfahrens Download PDFInfo
- Publication number
- EP2770102B1 EP2770102B1 EP14382047.0A EP14382047A EP2770102B1 EP 2770102 B1 EP2770102 B1 EP 2770102B1 EP 14382047 A EP14382047 A EP 14382047A EP 2770102 B1 EP2770102 B1 EP 2770102B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- laundry
- airflow
- rotation
- subphase
- 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
Links
- 238000001035 drying Methods 0.000 title claims description 39
- 238000000034 method Methods 0.000 title claims description 25
- 238000009423 ventilation Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
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
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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
-
- 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
- D06F2103/34—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
- D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
- D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
- D06F2105/48—Drum speed
-
- 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
- D06F2105/62—Stopping or disabling machine operation
Definitions
- the present invention is related to methods for drying laundry in a laundry dryer comprising a rotary drum. It is also related to a laundry dryer implementing said method.
- Laundry dryers comprising a rotary drum through which airflow is forced to circulate by means of a fan that extracts moisture from the laundry contained in the drum are known.
- EP2468950 A1 discloses a laundry dryer comprising a rotary drum for containing laundry. Airflow, which is forced through a fan arranged close to the air inlet, circulates through the inside of said drum. It also comprises a temperature sensor arranged at the outlet of the drum and a moisture sensor arranged inside the drum. The dryer also comprises control means running a drying program comprising a drying phase in which the drum rotates according to a first rotational speed. During the drying phase, the control means monitor the temperature of the exiting air due to the temperature sensor and the moisture content of the laundry contained in the drum due to the moisture sensor.
- the drum rotates according to a second rotational speed which is greater than the first speed. Said second rotational speed is equal to or greater than the minimum speed required to keep the laundry stuck to the walls of the drum.
- US6141887 A discloses a clothes drier comprising a rotary drum for accommodating wet clothes, electric heaters for heating the clothes, a temperature sensor for detecting a temperature in the rotary drum and an absolute humidity sensor for detecting the absolute humidity in the rotary drum.
- the absolute humidity values are detected and stored in a buffer so that the electric heaters can be controlled in response to the output of the absolute humidity sensor when compared with the stored values.
- EP0428846 A1 discloses a tumble drier comprising a rotating drum, heating means and a moisture content sensor which senses the moisture content of the air flowing from the drum. The highest moisture content sensed during the drying process is stored to compare it thereafter with a signal in order to interrupt the heating of the airflow if the difference between the moisture content sensed and the maximally sensed moisture content reaches a predetermined value.
- EP1975303 A1 discloses a method for drying clothes in a clothes drying machine.
- the drying machine comprises a rotating drum for containing the clothes and a drying cycle.
- the rotation speed of the drum is variable from a first pre-defined speed value to a sequence of successive speeds.
- the values of said successive speeds are progressively decreasing.
- the first rotation speed value is selected so that the drum rotates in a manner that the clothes with a high moisture content are adequately tumbled, i.e. the first rotation speed value is higher that the rotation speed at which the clothes tend to roll up into a clot on the bottom of the drum.
- the object of the invention is to provide a method of drying laundry in a laundry dryer and a laundry dryer implementing said method as described below.
- One aspect of the invention is related to the method of drying laundry.
- Said method comprises a drying phase in which airflow is forced to circulate through the inside of a rotary drum which is suitable for containing laundry while said drum rotates initially according to a first predetermined rotational speed.
- the drying phase also comprises at least one speed scanning subphase in which the drum rotates at different speeds, the moisture content of the exiting air corresponding to each speed being measured and recorded. At the end of said scanning subphase, the rotary drum rotates according to the speed corresponding to the highest moisture content measured.
- Another aspect of the invention is related to a laundry dryer.
- Said dryer comprises the rotary drum which is suitable for containing the laundry to be dried and through which forced airflow circulates.
- the dryer of the invention also comprises sensing means comprising at least one moisture sensor arranged at the outlet of the rotary drum for determining the moisture content of the airflow exiting the drum, ventilation means suitable for forcing the circulation of the airflow, said ventilation means being arranged at the outlet of the drum, and control means associated with the sensing means.
- Said control means implement the method of drying as described in the preceding paragraph.
- the cycle time of the drying phase is shortened because the extraction of water content from the laundry in the drum is optimized in a simple, effective and economical manner, thus contributing to enhance dryer efficiency.
- the scanning subphase allows establishing the optimal rotational speed of the drum so that the highest possible amount of moisture is extracted from the laundry contained in the drum. Since the conditions of the laundry vary throughout the drying phase (the amount of water and the weight of the laundry vary as the laundry gradually dries), the scanning subphase can be repeated throughout said drying phase to improve efficiency.
- Figure 1 shows a diagram of an embodiment of the laundry dryer according to the invention.
- the laundry dryer 1 according to the embodiment of the invention of Figure 1 comprises a rotary drum 2 which rotates according to an axial axis 9, as shown in the drawing, and through which forced airflow F circulates.
- Said drum 2 is suitable for containing laundry, preferably laundry that has been previously washed, for example in a washer, and thus contains certain moisture content.
- the laundry dryer 1 also comprises sensing means arranged at the outlet of the drum 2.
- Said sensing means comprise at least one moisture sensor 5 and determine the moisture content of the airflow F exiting the drum 2.
- Control means comprised in the dryer 1 and associated with said sensing means implement a method of drying as described below.
- the method of drying laundry contained in the laundry dryer 1 comprises a drying phase in which the airflow F is forced to circulate through the inside of the rotary drum 2 while said drum 2 rotates initially according to a first predetermined rotational speed.
- Said drying phase comprises at least one speed scanning subphase in which the drum 2 rotates at different speeds, the moisture content of the exiting air corresponding to each speed being measured and recorded, and at the end of said at least one scanning subphase, the rotary drum 2 rotates according to the speed corresponding to the highest moisture content measured.
- the moisture values corresponding to each rotational speed are recorded in the control means to be able to determine the speed corresponding to the highest moisture content measured.
- the cycle time of the drying phase is shortened because the extraction of water content from the laundry contained in the drum 2 is optimized in a simple, effective and economical manner, thus contributing to enhance efficiency of the laundry dryer 1.
- the scanning subphase allows establishing the optimal rotational speed of the drum 2 so that the highest possible amount of moisture is extracted from the laundry in the drum 2. Since the conditions of the laundry vary throughout the drying phase (the amount of water and the weight of the laundry vary as the laundry gradually dries), the scanning subphase can be repeated throughout said drying phase so that the improvement is optimal, as described in detail below.
- the drying phase also comprises a plurality of rotation steps wherein the rotary drum 2 rotates in opposite directions of rotation in successive rotation steps.
- the drum 2 rotates according to a direction of rotation A, for example clockwise
- the successive rotation step the drum 2 will rotate according to the opposite direction of rotation B, i.e., counterclockwise.
- Each rotation step can last between about a minute and about a minute and a half.
- the successive rotation steps are separated from one another by a pause wherein the drum stops rotating long enough so that the drum can change the direction of rotation.
- the drum 2 Before and after changing the direction of rotation, the drum 2 rotates at the same speed, i.e., after changing the direction of rotation, the drum 2 starts to rotate according to the rotational speed of the rotation step before the change. Changes in rotation are advantageous to assure that the laundry contained in the rotary drum 2 does not clump together or stick to the walls of the drum 2.
- the scanning subphase is carried out within a rotation step and during the drying phase said scanning subphase is repeated every two, three or four, preferably every three, successive rotation steps. Repeating the scanning subphase throughout the drying phase allows optimizing the extraction of water from the laundry contained in the drum 2 during the complete drying cycle, which allows improving the efficiency of the laundry dryer 1 and reducing the total cycle time, thus contributing to savings in the power consumption of the laundry dryer 1.
- the different speeds, i.e., the range of speeds, of the scanning subphase are chosen from a range of speeds between 20 and 80 revolutions per minute. There will be as many ranges of speeds as possible to assure that during the same rotation step the drum 2 can rotate according to all the speeds of said range of speeds, read the data relating to moisture content of the exiting airflow F corresponding to each rotational speed and record this value.
- the different rotational speeds are prefixed speeds.
- the different rotational speeds could be seven different speeds, for example with the following values:
- the first speed of the range of speeds of the scanning subphase of the corresponding rotation step could be a speed calculated in function of the moisture content of the exiting air and of the weight of the laundry contained in the drum 2, among others, and the other speeds of said subphase could be calculated by adding or subtracting a prefixed amount.
- control means of the laundry dryer 1 record the moisture content values measured by the moisture sensor 5, of the exiting airflow F corresponding to each speed of the range of speeds of the scanning subphase.
- the control means thus determine, at the end of each scanning subphase, the rotational speed in which the largest amount of water has been extracted from the laundry contained in the drum 2.
- the drum 2 in each speed of the range of speeds rotates for the shortest time possible in which a reliable reading of the moisture content of the exiting airflow is assured.
- the airflow F circulating through the inside of the drum 2 is forced by ventilation means arranged at the outlet of the drum 2.
- Said ventilation means comprise preferably a fan 3.
- the sensing means described above are arranged behind the ventilation means as seen in the diagram of Figure 1 , although the possibility of arranging said means in front of the ventilation means is also contemplated.
- the laundry dryer 1 comprises an air inlet conduit 6 where an end of said inlet conduit 6 is open to the atmosphere and the other end is communicated with the drum 2 through a side thereof, i.e., through the wall of the cylinder of the drum 2 corresponding to the upper portion of the laundry dryer 1.
- the inlet conduit 6 could be communicated with the drum 2 through the wall of the cylinder of the drum 2 corresponding to one of the sides of the dryer 1, or to both sides, or even by the lower portion of the dryer 1. Therefore, in the embodiment of the invention, said inlet conduit 6 is suitable for providing a substantially radial airflow F to the drum. Said radial airflow F is so called because it enters the drum 2 according to the substantially radial direction of the drum 2.
- the side wall of the drum 2, i.e., the wall of the cylinder of the drum 2, comprises openings, preferably in the form of holes distributed over said wall which allow the entry of said airflow F into the drum 2.
- the laundry dryer 1 also comprises an air outlet conduit 7. One end of said outlet conduit 7 is communicated with the drum 2, said outlet conduit 7 being suitable for guiding the airflow F exiting the drum 2, through the openings in the walls of the drum 2, to the outside. Ventilation means, i.e., the fan 3, and the sensing means are placed in said air outlet conduit 7, the sensing means being arranged behind the ventilation means as described above.
- the outlet conduit 7 can also comprise a filter 8 suitable for retaining fluff that the laundry contained in the drum 2 may release, thus preventing said fluff from getting out.
- Said filter 8 is preferably arranged before the fan 3, the risk of the fan 3 breaking down thus being reduced.
- the drum 2 also comprises a rear wall, not shown in the drawings, whereas the front portion is open to allow putting laundry in or taking laundry out of the drum 2.
- the airflow F may enter the drum 2 through said rear wall according to a substantially axial direction.
- the possibility of the airflow entering the drum 2 being a mix between a radial and axial inlet is also contemplated. This configuration is particularly advantageous when the laundry dryer comprises a fresh air inlet and a recirculated air inlet.
- the laundry dryer 1 comprises a door in the front portion (not shown in the drawings), preferably a drop or sectional one.
- Sectional door is understood as a door which is formed by sections connected to one another, preferably horizontally, the door being opened, preferably vertically, by sliding between guides.
- the door When the door is open, there is an access to the inside of the drum 2, the laundry being able to be put into or taken out of the drum 2.
- the control means When the door is closed, it is possible for the control means to implement the described method of drying.
- the incoming airflow F can be previously heated to reduce the total drying cycle.
- the laundry dryer 1 can comprise heating means 4, such as resistive means, steam means or gas means, suitable for heating at least part of the airflow prior to entry into the drum 2. Said heating means are arranged in the inlet conduit 6.
- the drying phase of the laundry dryer 1 of the embodiment of the invention ends when the moisture content of the exiting airflow exiting the rotary drum 2 stabilizes at a value less than a predefined moisture value.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Claims (12)
- Verfahren zum Trocknen von Wäsche, die in einem Wäschetrockner (1) enthalten ist, wobei der Wäschetrockner (1) eine Drehtrommel (2) umfasst, die zum Enthalten von Wäsche geeignet ist, und wobei das Verfahren eine Trocknungsphase umfasst, in der erzwungen wird, dass ein Luftstrom (F) durch das Innere der Drehtrommel (2) zirkuliert, während die Drehtrommel (2) sich anfänglich gemäß einer ersten vorherbestimmten Drehgeschwindigkeit dreht, dadurch gekennzeichnet, dass die Trocknungsphase mindestens eine Geschwindigkeitsabtastungsunterphase umfasst, in der die Trommel (2) sich mit unterschiedlichen Geschwindigkeiten dreht, der Feuchtigkeitsgehalt der austretenden Luft, der jeder Geschwindigkeit entspricht, gemessen und aufgezeichnet wird und zum Ende der mindestens einen Geschwindigkeitsabtastungsunterphase die Drehtrommel (2) sich gemäß der Geschwindigkeit dreht, die dem höchsten gemessenen Feuchtigkeitsgehalt entspricht.
- Verfahren nach Anspruch 1, wobei die Trommel (2) sich während der Abtastungsunterphase in jeder Geschwindigkeit für die kürzest mögliche Zeit dreht, in der ein zuverlässiger Messwert des Feuchtigkeitsgehalts des austretenden Luftstroms sichergestellt ist.
- Verfahren nach Anspruch 1 oder 2, wobei die unterschiedlichen Geschwindigkeiten der Abtastungsunterphase in einem Bereich von Geschwindigkeiten zwischen 20 und 80 Umdrehungen pro Minute ausgewählt werden.
- Verfahren nach einem der vorhergehenden Ansprüche, wobei die Trocknungsphase mehrere Drehungsschritte umfasst, wobei die Drehtrommel (2) sich in aufeinanderfolgenden Drehungsschritten in entgegengesetzte Drehungsrichtungen dreht, so dass die Trommel (2) sich in einem Drehungsschritt gemäß einer Drehungsrichtung (A) dreht und die Trommel (2) sich in dem folgenden Drehungsschritt gemäß der entgegengesetzten Richtung (B) dreht.
- Verfahren nach Anspruch 4, wobei zwei zusammenhängende Drehungsschritte durch eine Pause getrennt sind, wobei die Pause lang genug ist, so dass die Trommel (2) aufhört, sich zu drehen, die Drehungsrichtung ändert und sich gemäß derselben Geschwindigkeit des vorhergehenden Drehungsschritt zu drehen beginnt.
- Verfahren nach Anspruch 4 oder 5, wobei die Abtastungsunterphase innerhalb eines Drehungsschritts durchgeführt wird.
- Verfahren nach einem der Ansprüche 4 bis 6, wobei während der Trocknungsphase die Abtastungsunterphase alle zwei, drei oder vier, vorzugsweise alle drei Drehungsschritte wiederholt wir.
- Verfahren nach einem der vorhergehenden Ansprüche, wobei die Trocknungsphase endet, wenn der Feuchtigkeitsgehalt des Luftstroms, der aus der Trommel (2) austritt, kleiner gleich einem vorherdefinierten Feuchtigkeitsgehalt ist.
- Verfahren nach einem der vorhergehenden Ansprüche, wobei der Luftstrom (F), von dem erzwungen wird, dass er durch das Innere der Trommel (2) zirkuliert, zuvor erhitzt wird.
- Wäschetrockner, der eine Drehtrommel (2), die zum Enthalten von Wäsche geeignet ist und durch die ein erzwungener Luftstrom (F) zirkuliert, Erfassungsmittel, die mindestens einen Feuchtigkeitssensor (5) umfassen, der am Auslass der Trommel (2) angeordnet ist und den Feuchtigkeitsgehalt des Luftstroms, der aus der Trommel (2) austritt, bestimmt, und Belüftungsmittel, die zum Erzwingen der Zirkulation des Luftstroms (F) geeignet sind, umfasst, wobei die Belüftungsmittel am Auslass der Trommel (2) angeordnet sind, dadurch gekennzeichnet, dass er außerdem Steuermittel umfasst, die mit den Erfassungsmitteln assoziiert sind und zum Umsetzen eines Trocknungsverfahrens nach einem der Ansprüche 1 bis 9 konfiguriert sind.
- Wäschetrockner nach Anspruch 10, wobei die Belüftungsmittel ein Gebläse (3) umfassen.
- Wäschetrockner nach Anspruch 10 oder 11, wobei der Wäschetrockner (1) außerdem Heizmittel (4), wie Widerstandsmittel, Gasmittel oder eine Dampf- oder Thermoölbatterie, umfasst, die zum Erhitzen mindestens eines Teils des Luftstroms vor dem Eintritt in die Trommel (2) geeignet sind.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES201330246A ES2489917B1 (es) | 2013-02-25 | 2013-02-25 | Método para secar la ropa contenida en una secadora de ropa y secadora de ropa que implementa dicho método |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2770102A1 EP2770102A1 (de) | 2014-08-27 |
EP2770102B1 true EP2770102B1 (de) | 2015-12-30 |
Family
ID=50101848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14382047.0A Active EP2770102B1 (de) | 2013-02-25 | 2014-02-10 | Verfahren zum Trocknen von Wäsche in einem Wäschetrockner und Wäschetrockner zur Durchführung des besagten Verfahrens |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2770102B1 (de) |
ES (2) | ES2489917B1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104963180B (zh) * | 2015-05-29 | 2018-05-15 | 无锡小天鹅股份有限公司 | 干衣设备的烘干方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69002494T2 (de) * | 1989-03-24 | 1993-11-25 | Sanyo Electric Co | Verfahren und Vorrichtung zur Steuerung eines Wäschetrockners. |
SE464710B (sv) * | 1989-09-22 | 1991-06-03 | Asko Cylinda Ab | Torktumlare |
US6141887A (en) * | 1997-03-13 | 2000-11-07 | General Electric Company | System and method for sensing the dryness of clothing articles |
EP1790769B1 (de) * | 2005-11-23 | 2010-04-14 | Electrolux Home Products Corporation N.V. | Wäschetrommeltrockner und Verfahren zur Steuerung desselben |
ATE459744T1 (de) * | 2007-03-30 | 2010-03-15 | Electrolux Home Prod Corp | Verbesserung an einem wäschetrockner und entsprechendes verfahren zum wäschetrocknen |
KR20120065628A (ko) * | 2010-12-13 | 2012-06-21 | 삼성전자주식회사 | 건조기 |
ITTO20101070A1 (it) | 2010-12-27 | 2012-06-28 | Indesit Co Spa | Procedimento e macchina per l'asciugatura di biancheria |
-
2013
- 2013-02-25 ES ES201330246A patent/ES2489917B1/es not_active Expired - Fee Related
-
2014
- 2014-02-10 ES ES14382047.0T patent/ES2564880T3/es active Active
- 2014-02-10 EP EP14382047.0A patent/EP2770102B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
EP2770102A1 (de) | 2014-08-27 |
ES2489917R1 (es) | 2015-03-18 |
ES2564880T3 (es) | 2016-03-29 |
ES2489917B1 (es) | 2016-01-21 |
ES2489917A2 (es) | 2014-09-02 |
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