EP1682715B1 - Method for drying laundry and laundry dryer for carrying out said method - Google Patents

Method for drying laundry and laundry dryer for carrying out said method Download PDF

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Publication number
EP1682715B1
EP1682715B1 EP04790664A EP04790664A EP1682715B1 EP 1682715 B1 EP1682715 B1 EP 1682715B1 EP 04790664 A EP04790664 A EP 04790664A EP 04790664 A EP04790664 A EP 04790664A EP 1682715 B1 EP1682715 B1 EP 1682715B1
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EP
European Patent Office
Prior art keywords
air
drying
laundry
drying chamber
disposed
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EP04790664A
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German (de)
French (fr)
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EP1682715A1 (en
Inventor
Hans-Werner Böttcher
Eckhard Nave
Holger Wagner
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Miele und Cie KG
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Miele und Cie KG
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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
    • D06F2103/28—Air properties
    • D06F2103/30—Pressure
    • 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
    • D06F2103/36—Flow or velocity
    • 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
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • 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
    • D06F2105/32—Air flow control means
    • 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

Definitions

  • the invention relates to a method for drying laundry and a tumble dryer for carrying out the method with a drying chamber and a process air guide, in which a blower for conveying the drying air through the drying chamber and a heater are arranged, wherein the process air duct formed with a fresh air supply and an exhaust air discharge and wherein in the process air duct means for separating the dry air flow in an exhaust air portion and a recirculation portion are arranged, wherein the clothes dryer has sensors for detecting process parameters and depending on the detected parameters, a control of the means for separating the dry air flow for a change in the exhaust air / recirculated air he follows.
  • Such a method is known from DE 22 20 425 A1 for a tumble dryer with a water-cooled condenser known.
  • the dry air flow is guided through the process air duct with the blower, the heater and the water-cooled condenser and through the drying chamber.
  • the process air channel is formed with a fresh air supply and an exhaust air duct.
  • the process air duct flaps on which open or close the fresh air opening and the exhaust opening completely or partially.
  • the dry air In a first drying section, in which the laundry is still wet or relatively moist, the dry air is conducted in a closed circuit. In this first drying section, the flaps are closed.
  • the tumble dryer can be operated after reaching a predetermined degree of dryness of the laundry in a partially open circuit.
  • part of the dry air is recirculated as recirculated air portion back into the drying chamber and a part as exhaust air from the unit out.
  • the flaps As a process parameter for the control of the flaps, the residual moisture content in the laundry is evaluated.
  • the water-cooled condenser remains switched on and the flaps partially release their openings to the fresh air inlet or exhaust air outlet.
  • it is provided to switch off the condenser and to operate the tumble dryer with the fresh air supply open and the exhaust air opening open as an exhaust air dryer.
  • a tumble dryer (Miele T 6251) is known with a constant set exhaust air / recirculation, in which over the entire drying process, a portion of the dry air is recirculated as recirculated air back into the drying chamber.
  • This dryer has as a drying chamber a rotatably mounted drying drum with a drum volume of 250 liters.
  • the drying drum is followed by a process air guide section with a filter device, which is referred to as a filter chamber.
  • the fan area is arranged with the blower.
  • a guide plate is arranged in the flow direction, which divides the air flow into the exhaust air portion and the recirculated air proportion.
  • the exhaust air component is led out of the unit via the exhaust air opening.
  • the proportion of recirculated air is mixed with fresh air, which is sucked due to the negative pressure in the drying drum on the fresh air opening.
  • Fresh air and recirculated air are heated again via the heater and routed again into the drying drum.
  • the still wet, heavy laundry is optimally moved in the air stream in the drying drum.
  • the laundry almost completely fills the drying drum. Due to the arrangement and design and the dimensioning of the blower for a large-volume drying drum, the laundry items can be sucked at the air outlet of the drying drum.
  • the laundry When drying quilts, pillows and duvets, the laundry can be sucked before the dry air outlet of the drying drum due to the negative pressure and at an advanced degree of dry laundry filling. This problem can also occur when drying air-impermeable textiles z. B. outdoor clothing occur. By adhering to the suction textiles, the air flow is interrupted by the drying drum and the laundry in the drum overheated or not dried gently.
  • the invention thus presents the problem of avoiding damage to the laundry, which may occur due to an interruption of the drying air flow in the drying drum, and to achieve an optimum drying result.
  • the achievable with the present invention consist in particular in that an interruption of the dry air flow through textiles that partially or completely close the airway, can be detected immediately by a direct monitoring of the pressure conditions or the pressure profile in the drying chamber. Depending on the detected Values the reduced air volume of the dry air is reduced or set to zero and the drying process continues with reduced volume flow. This reduces the suction on the textiles and the airway is released again.
  • it is provided to reduce or switch off the heating power as a function of the reduced volume flow through the drying drum.
  • the advantages achievable with the invention also consist in particular in that the pressure sensor of the drying chamber is assigned directly.
  • the pressure sensor is advantageously arranged in the region of the air inlet opening to the drying chamber, which can be reacted directly to the present in the drying chamber pressure conditions.
  • the drying air volume flow in the drying chamber is reduced by activating a blocking flap arranged in the process air guide for the circulating air path of the circulated air portion in the dry air.
  • the air circulation can be completely or partially closed.
  • the suction effect on the adhering to the suction port or the air outlet openings textiles are reduced and these fall back into the drying chamber. It has proven to be advantageous to continue the drying process thereafter with the reduced dry air volume flow in order to avoid a renewed interruption of the drying air flow through the textiles.
  • the drying chamber of a tumble dryer is designed as a rotatably mounted drying drum (1).
  • the air outlet opening (2) of the drying drum (1) which is arranged in the region of the front-side filling opening (3) for the laundry, is a process air guiding section, which can be referred to as filter chamber (4), connected downstream with a filter device (5).
  • the dry air is conveyed by means of blower (6) via the filter device (5) from the filter chamber (4) into the blower area (7) with the exhaust air / circulation air distribution.
  • the fan area (7) with the exhaust air / circulating air distribution is compared to the filter chamber (4) by a partition wall (8) with one to the rotating Drying drum (1) directed sealing assembly (9) completed.
  • the dry air is passed via a in the partition (8) formed inlet nozzle (10) axially to the blower (6).
  • the fan area (7) with the means (guide plate 11, flap 14) for the separation of the dry air flow into an exhaust air portion and a recirculated air portion is shown schematically in front view.
  • the guide plate (11) On the pressure side of the blower (6), the guide plate (11) is arranged, which divides the radially emerging air flow into the exhaust air portion and the recirculated air.
  • the guide plate (11) is arranged approximately parallel to the flow direction of the exiting dry air.
  • the exhaust air component is led out of the device via the exhaust air opening (12).
  • the proportion of recirculated air is conducted into the circulating air path (13), which can be completely or partially closed by means of a flap (14) shown in more detail in FIG.
  • the proportion of recirculated air is mixed with fresh air, which is sucked due to the negative pressure in the drying drum (1) via the fresh air opening (15) on the back of the device.
  • Fresh air content and recirculated air content are heated again via the arranged in the Bankkanalabintroductory (16) of the dry air guide heater (17) and re-introduced into the drying drum (1).
  • a further sealing arrangement (18) is arranged between the heating channel section (16) and rotating drying drum (1).
  • a pressure sensor (20) which detects the pressure profile in the drying drum (1) is arranged in the air inlet region (19) of the drying air to the drying drum (1).
  • the pressure profile is evaluated by the program control (21) of the tumble dryer for controlling the flap (14) arranged in the circulating air path (13). If it comes in the course of the drying process that laundry items (W) at the air outlet (2) of the drying drum (1) are sucked, the drying air flow in the drying drum (1) is interrupted. Depending on the deviation from the permissible pressure value or pressure profile in the drying drum (1), a control of the flap (14) arranged in the circulating air path (13) takes place. In this case, the recirculated air portion of the dry air is reduced or set equal to zero by the flap (14) is completely or partially closed by an adjusting device (22). The drying process is continued with reduced volume flow through the drying drum (1). When the flap (14) is completely closed, the volume flow of the dry air is reduced to the fixed proportion of the exhaust air volume flow predetermined by the arrangement of the guide plate (11). Depending on the reduced dry air flow, the heating power can be reduced or switched off completely.

Abstract

A method for drying laundry in a laundry dryer having a program control device, a drying chamber and a process air circuit includes providing a flow dividing device in the process air circuit for dividing the drying air flow into an exhaust air component and a recirculated air component. A sensor is used to measure a pressure in the process air stream in an area where the drying air enters the drying chamber. The pressure is evaluated and the flow dividing device is controlled based on the evaluation so as to reduce or set to zero the recirculated air component and to continue the drying process at a reduced volumetric flow rate of the drying air through the drying chamber.

Description

Die Erfindung betrifft ein Verfahren zum Trocknen von Wäsche sowie einen Wäschetrockner zur Durchführung des Verfahrens mit einer Trockenkammer und einer Prozessluftführung, in der ein Gebläse zur Förderung der Trockenluft durch die Trockenkammer sowie eine Heizeinrichtung angeordnet sind, wobei die Prozessluftführung mit einer Frischluftzufuhr sowie einer Abluftabführung ausgebildet ist und wobei in der Prozessluftführung Mittel zur Trennung des Trockenluftstromes in einen Abluftanteil und einen Umluftanteil angeordnet sind, wobei der Wäschetrockner Sensoren zur Erfassung von Prozessparametern aufweist und in Abhängigkeit der erfassten Parameter eine Ansteuerung der Mittel zur Trennung des Trockenluftstromes für eine Veränderung des Abluft/Umluftanteils erfolgt.The invention relates to a method for drying laundry and a tumble dryer for carrying out the method with a drying chamber and a process air guide, in which a blower for conveying the drying air through the drying chamber and a heater are arranged, wherein the process air duct formed with a fresh air supply and an exhaust air discharge and wherein in the process air duct means for separating the dry air flow in an exhaust air portion and a recirculation portion are arranged, wherein the clothes dryer has sensors for detecting process parameters and depending on the detected parameters, a control of the means for separating the dry air flow for a change in the exhaust air / recirculated air he follows.

Ein derartiges Verfahren ist aus der DE 22 20 425 A1 für einen Wäschetrockner mit einem wassergekühlten Kondensator bekannt. Der Trockenluftstrom wird dabei durch den Prozessluftkanal mit dem Gebläse, der Heizeinrichtung und dem wassergekühlten Kondensator und durch die Trockenkammer geführt. Der Prozessluftkanal ist mit einer Frischluftzufuhr und einer Abluftführung ausgebildet. Als Mittel zur Trennung des Trockenluftstromes in einen Abluftanteil und einen Umluftanteil weist der Prozessluftkanal Klappen auf, welche die Frischluftöffnung sowie die Abluftöffnung ganz oder teilweise öffnen oder verschließen.
In einem ersten Trocknungsabschnitt, in dem die Wäsche noch nass bzw. relativ feucht ist, wird die Trockenluft im geschlossenen Kreislauf geführt. In diesem ersten Trockenabschnitt sind die Klappen geschlossen. Im weiteren Trocknungsverlauf kann der Wäschetrockner nach Erreichen eines vorgegebenen Trockengrades der Wäsche im teilweise offenen Kreislauf betrieben werden. Dabei wird ein Teil der Trockenluft als Umluftanteil wieder in die Trockenkammer und ein Teil als Abluftanteil aus dem Gerät heraus geführt. Als Prozessparameter für die Ansteuerung der Klappen wird der Restfeuchtegehalt in der Wäsche ausgewertet. In diesem Trocknungsabschnitt bleibt der wassergekühlte Kondensator eingeschaltet und die Klappen geben ihre Öffnungen zum Frischlufteinlass bzw. Abluftauslass teilweise frei. Bei fortgeschrittenem Trockengrad der Wäsche ist vorgesehen, den Kondensator abzuschalten und den Wäschetrockner bei geöffneter Frischluftzufuhr und geöffneter Abluftöffnung als Ablufttrockner zu betreiben.Such a method is known from DE 22 20 425 A1 for a tumble dryer with a water-cooled condenser known. The dry air flow is guided through the process air duct with the blower, the heater and the water-cooled condenser and through the drying chamber. The process air channel is formed with a fresh air supply and an exhaust air duct. As a means for separating the dry air flow into an exhaust air portion and a recirculated air portion, the process air duct flaps on which open or close the fresh air opening and the exhaust opening completely or partially.
In a first drying section, in which the laundry is still wet or relatively moist, the dry air is conducted in a closed circuit. In this first drying section, the flaps are closed. In the further course of drying, the tumble dryer can be operated after reaching a predetermined degree of dryness of the laundry in a partially open circuit. In this case, part of the dry air is recirculated as recirculated air portion back into the drying chamber and a part as exhaust air from the unit out. As a process parameter for the control of the flaps, the residual moisture content in the laundry is evaluated. In this drying section, the water-cooled condenser remains switched on and the flaps partially release their openings to the fresh air inlet or exhaust air outlet. In the case of an advanced degree of drying of the laundry, it is provided to switch off the condenser and to operate the tumble dryer with the fresh air supply open and the exhaust air opening open as an exhaust air dryer.

Aus der DE 200 10 728 U1 ist ein Wäschetrockner mit einer Umluftanordnung bekannt, bei dem Heizung, Gebläse und ein Umluftkasten mit einer ansteuerbaren Klappe für die Einstellung eines Abluft/Umluftanteils der Trockenluft zu einer Baueinheit zusammengefasst und auf der Oberseite des Wäschetrockners angeordnet sind. Bei diesem Wäschetrockner muss die Betriebsart Abluft/Umluft bzw. die Stellung der Klappe für den Abluft/Umluftanteil manuell gewählt werden. Eine Ansteuerung der Klappe in Abhängigkeit von Prozessparametern ist nicht vorgesehen.From the DE 200 10 728 U1 is a clothes dryer with a circulating air arrangement known in which heating, blower and a recirculation box with a controllable flap for setting an exhaust air / recirculated air portion of the dry air are combined to form a unit and arranged on top of the clothes dryer. For this tumble dryer, the operating mode exhaust air / recirculated air or the position of the flap for the exhaust air / recirculated air proportion must be set manually to get voted. A control of the flap as a function of process parameters is not provided.

Außerdem ist ein Wäschetrockner (Miele T 6251) mit einer konstant eingestellten Abluft/Umluftführung bekannt, bei dem über den gesamten Trockenprozess ein Teil der Trockenluft als Umluftanteil wieder in die Trockenkammer geleitet wird. Dieser Wäschetrockner weist als Trockenkammer eine drehbar gelagerte Trockentrommel mit einem Trommelvolumen von 250 Liter auf. Der Trockentrommel ist ein Prozessluftführungsabschnitt mit einer Filtereinrichtung nachgeschaltet, welcher als Filterkammer bezeichnet wird. Im Anschluss an die Filterkammer ist der Gebläsebereich mit dem Gebläse angeordnet. Auf der Druckseite des Gebläses ist ein Leitblech in Strömungsrichtung angeordnet, welches den Luftstrom in den Abluftanteil und den Umluftanteil aufteilt. Der Abluftanteil wird über die Abluftöffnung aus dem Gerät heraus geführt. Der Umluftanteil wird mit Frischluft vermischt, welche bedingt durch den Unterdruck in der Trockentrommel über die Frischluftöffnung angesaugt wird. Frischluftanteil und Umluftanteil werden wieder über die Heizung erwärmt und erneut in die Trockentrommel geleitet. Zu Beginn des Trockenprozesses wird die noch nasse, schwere Wäsche optimal im Luftstrom in der Trockentrommel bewegt. Zum Ende des Trockenprozesses füllt die Wäsche die Trockentrommel fast vollständig aus. Bedingt durch die Anordnung und Ausbildung sowie die Dimensionierung des Gebläses für eine großvolumige Trockentrommel können die Wäschestücke am Luftaustritt der Trockentrommel angesaugt werden. Beim Trocknen von Oberbetten, Kopfkissen und Daunendecken kann die Wäsche infolge des Unterdruckes und bei fortgeschrittenem Trockengrad der Wäschefüllung vor den Trockenluftaustritt der Trockentrommel gesogen werden. Dieses Problem kann auch beim Trocknen von luftundurchlässigen Textilien z. B. Outdoorbekleidung auftreten. Durch die an der Ansaugöffnung haftenden Textilien wird die Luftführung über die Trockentrommel unterbrochen und die Wäsche in der Trommel überhitzt bzw. nicht schonend getrocknet.In addition, a tumble dryer (Miele T 6251) is known with a constant set exhaust air / recirculation, in which over the entire drying process, a portion of the dry air is recirculated as recirculated air back into the drying chamber. This dryer has as a drying chamber a rotatably mounted drying drum with a drum volume of 250 liters. The drying drum is followed by a process air guide section with a filter device, which is referred to as a filter chamber. Following the filter chamber, the fan area is arranged with the blower. On the pressure side of the fan, a guide plate is arranged in the flow direction, which divides the air flow into the exhaust air portion and the recirculated air proportion. The exhaust air component is led out of the unit via the exhaust air opening. The proportion of recirculated air is mixed with fresh air, which is sucked due to the negative pressure in the drying drum on the fresh air opening. Fresh air and recirculated air are heated again via the heater and routed again into the drying drum. At the beginning of the drying process, the still wet, heavy laundry is optimally moved in the air stream in the drying drum. At the end of the drying process, the laundry almost completely fills the drying drum. Due to the arrangement and design and the dimensioning of the blower for a large-volume drying drum, the laundry items can be sucked at the air outlet of the drying drum. When drying quilts, pillows and duvets, the laundry can be sucked before the dry air outlet of the drying drum due to the negative pressure and at an advanced degree of dry laundry filling. This problem can also occur when drying air-impermeable textiles z. B. outdoor clothing occur. By adhering to the suction textiles, the air flow is interrupted by the drying drum and the laundry in the drum overheated or not dried gently.

Der Erfindung stellt sich somit das Problem, Wäscheschäden, die durch eine Unterbrechung des Trockenluftstromes in der Trockentrommel auftreten können, zu vermeiden und ein optimales Trockenergebnis zu erzielen.The invention thus presents the problem of avoiding damage to the laundry, which may occur due to an interruption of the drying air flow in the drying drum, and to achieve an optimum drying result.

Erfindungsgemäß wird dieses Problem durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 sowie einen Wäschetrockner zur Durchführung des Verfahrens mit den Merkmalen des Patentanspruchs 3 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den jeweils nachfolgenden Unteransprüchen.According to the invention, this problem is solved by a method having the features of patent claim 1 and a tumble dryer for carrying out the method with the features of patent claim 3. Advantageous embodiments and modifications of the invention will become apparent from the respective following subclaims.

Die mit der Erfindung erreichbaren Vorteile bestehen insbesondere darin, dass eine Unterbrechung des Trockenluftstromes durch Textilien, die den Luftweg teilweise oder ganz verschließen, sofort durch eine direkte Überwachung der Druckverhältnisse bzw. des Druckverlaufes in der Trockenkammer erkannt werden kann. In Abhängigkeit der erfassten Werte wird der Umluftanteil der Trockenluft reduziert oder auf Null gesetzt und der Trockenprozess mit vermindertem Volumenstrom fortgesetzt. Dadurch verringert sich die Saugwirkung auf die Textilien und der Luftweg wird wieder frei gegeben. In einer vorteilhaften Weiterbildung des erfindungsgemäßen Verfahrens ist vorgesehen, die Heizleistung in Abhängigkeit des verminderten Volumenstromes durch die Trockentrommel zu reduzieren oder abzuschalten.The achievable with the present invention consist in particular in that an interruption of the dry air flow through textiles that partially or completely close the airway, can be detected immediately by a direct monitoring of the pressure conditions or the pressure profile in the drying chamber. Depending on the detected Values the reduced air volume of the dry air is reduced or set to zero and the drying process continues with reduced volume flow. This reduces the suction on the textiles and the airway is released again. In an advantageous development of the method according to the invention, it is provided to reduce or switch off the heating power as a function of the reduced volume flow through the drying drum.

Die mit der Erfindung erreichbaren Vorteile bestehen außerdem insbesondere darin, dass der Drucksensor der Trockenkammer direkt zugeordnet ist. Der Drucksensor ist vorteilhaft im Bereich der Lufteintrittsöffnung zur Trockenkammer angeordnet, wodurch direkt auf die in der Trockenkammer vorliegenden Druckverhältnisse reagiert werden kann. In Abhängigkeit des erfassten Druckwertes wird der Trockenluftvolumenstrom in der Trockenkammer durch Ansteuern einer in der Prozessluftführung angeordneten Sperrklappe für den Umluftweg des Umluftanteils in der Trockenluft reduziert. Der Umluftweg kann ganz oder teilweise verschlossen werden. Dadurch wird die Saugwirkung auf die an der Ansaugöffnung bzw. der Luftaustrittsöffnung haftenden Textilien reduziert und diese fallen in die Trockenkammer zurück. Es hat sich als vorteilhaft erwiesen, den Trockenprozess danach mit dem reduzierten Trockenluftvolumenstrom fortzusetzen, um eine erneute Unterbrechung des Trockenluftstromes durch die Textilien zu vermeiden. In Abhängigkeit des verminderten Volumenstromes ist es vorteilhaft, die Heizleistung ebenfalls zu reduzieren bzw. ganz abzuschalten.The advantages achievable with the invention also consist in particular in that the pressure sensor of the drying chamber is assigned directly. The pressure sensor is advantageously arranged in the region of the air inlet opening to the drying chamber, which can be reacted directly to the present in the drying chamber pressure conditions. Depending on the detected pressure value, the drying air volume flow in the drying chamber is reduced by activating a blocking flap arranged in the process air guide for the circulating air path of the circulated air portion in the dry air. The air circulation can be completely or partially closed. As a result, the suction effect on the adhering to the suction port or the air outlet openings textiles are reduced and these fall back into the drying chamber. It has proven to be advantageous to continue the drying process thereafter with the reduced dry air volume flow in order to avoid a renewed interruption of the drying air flow through the textiles. Depending on the reduced volume flow, it is advantageous to reduce the heating power also or turn off completely.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt

Figur 1
schematisch einen erfindungsgemäßen Wäschetrockner zur Durchführung des Verfahrens in der Seitenansicht im Schnitt,
Figur 2
schematisch die Abluft/Umlufttrennung in Frontansicht,
Figur 3
eine perspektivische Darstellung des Wäschetrockners mit der Anordnung der Sperrklappe für den Umluftweg.
An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. It shows
FIG. 1
schematically a clothes dryer according to the invention for carrying out the method in side view in section,
FIG. 2
schematically the exhaust air / circulating air separation in front view,
FIG. 3
a perspective view of the tumble dryer with the arrangement of the damper for the Umluftweg.

In der Figur 1 ist die Trockenkammer eines Wäschetrockners als drehbar gelagerte Trockentrommel (1) ausgebildet. Der Luftaustrittsöffnung (2) der Trockentrommel (1), welche im Bereich der frontseitigen Einfüllöffnung (3) für die Wäsche angeordnet ist, ist ein Prozessluftführungsabschnitt, welcher als Filterkammer (4) bezeichnet werden kann, mit einer Filtereinrichtung (5) nachgeschaltet. Die Trockenluft wird mittels Gebläse (6) über die Filtereinrichtung (5) aus der Filterkammer (4) in den Gebläsebereich (7) mit der Abluft/Umluftverteilung gefördert. Der Gebläsebereich (7) mit der Abluft/Umluftverteilung ist gegenüber der Filterkammer (4) durch eine Trennwand (8) mit einer zur drehenden Trockentrommel (1) gerichteten Dichtungsanordnung (9) abgeschlossen. Die Trockenluft wird über eine in der Trennwand (8) ausgebildete Einströmdüse (10) axial zum Gebläse (6) geleitet.In FIG. 1, the drying chamber of a tumble dryer is designed as a rotatably mounted drying drum (1). The air outlet opening (2) of the drying drum (1), which is arranged in the region of the front-side filling opening (3) for the laundry, is a process air guiding section, which can be referred to as filter chamber (4), connected downstream with a filter device (5). The dry air is conveyed by means of blower (6) via the filter device (5) from the filter chamber (4) into the blower area (7) with the exhaust air / circulation air distribution. The fan area (7) with the exhaust air / circulating air distribution is compared to the filter chamber (4) by a partition wall (8) with one to the rotating Drying drum (1) directed sealing assembly (9) completed. The dry air is passed via a in the partition (8) formed inlet nozzle (10) axially to the blower (6).

In Figur 2 ist der Gebläsebereich (7) mit den Mitteln (Leitblech 11, Klappe 14) zur Trennung des Trockenluftstromes in einen Abluftanteil und einen Umluftanteil schematisch in der Frontansicht dargestellt. Auf der Druckseite des Gebläses (6) ist das Leitblech (11) angeordnet, welches den radial austretenden Luftstrom in den Abluftanteil und den Umluftanteil aufteilt. Das Leitblech (11) ist annähernd parallel zur Strömungsrichtung der austretenden Trockenluft angeordnet.
Der Abluftanteil wird über die Abluftöffnung (12) aus dem Gerät heraus geführt. Der Umluftanteil wird in den Umluftweg (13) geleitet, welcher über eine in Figur 1 näher dargestellte Klappe (14) ganz oder teilweise verschließbar ist. Der Umluftanteil wird mit Frischluft vermischt, welche bedingt durch den Unterdruck in der Trockentrommel (1) über die Frischluftöffnung (15) auf der Geräterückseite angesaugt wird. Frischluftanteil und Umluftanteil werden wieder über die im Heizkanalabschnitt (16) der Trockenluftführung angeordnete Heizung (17) erwärmt und erneut in die Trockentrommel (1) geleitet. Zwischen Heizkanalabschnitt (16) und drehender Trockentrommel (1) ist eine weitere Dichtungsanordnung (18) angeordnet. In dem Zwischenraum zwischen feststehendem Heizkanalabschnitt (16) und drehender Trockentrommel (1) ist im Lufteintrittsbereich (19) der Trockenluft zur Trockentrommel (1) ein Drucksensor (20) angeordnet, der den Druckverlauf in der Trockentrommel (1) erfasst. Der Druckverlauf wird von der Programmsteuerung (21) des Wäschetrockners zur Ansteuerung der im Umluftweg (13) angeordneten Klappe (14) ausgewertet. Kommt es im Verlauf des Trockenprozesses dazu, dass Wäschestücke (W) am Luftaustritt (2) der Trockentrommel (1) angesaugt werden, wird der Trockenluftstrom in der Trockentrommel (1) unterbrochen. In Abhängigkeit der Abweichung vom zulässigen Druckwert bzw. Druckverlauf in der Trockentrommel (1) erfolgt eine Ansteuerung der im Umluftweg (13) angeordneten Klappe (14). Dabei wird der Umluftanteil der Trockenluft reduziert oder gleich Null gesetzt, indem die Klappe (14) ganz oder teilweise über eine Verstelleinrichtung (22) geschlossen wird. Der Trockenprozess wird mit vermindertem Volumenstrom durch die Trockentrommel (1) fortgesetzt. Bei ganz geschlossener Klappe (14) reduziert sich der Volumenstrom der Trockenluft auf den durch die Anordnung des Leitblechs (11) vorgegebenen festen Anteil des Abluftvolumenstromes. In Abhängigkeit des reduzierten Trockenluftstromes kann die Heizleistung reduziert oder ganz abgeschaltet werden.In Figure 2, the fan area (7) with the means (guide plate 11, flap 14) for the separation of the dry air flow into an exhaust air portion and a recirculated air portion is shown schematically in front view. On the pressure side of the blower (6), the guide plate (11) is arranged, which divides the radially emerging air flow into the exhaust air portion and the recirculated air. The guide plate (11) is arranged approximately parallel to the flow direction of the exiting dry air.
The exhaust air component is led out of the device via the exhaust air opening (12). The proportion of recirculated air is conducted into the circulating air path (13), which can be completely or partially closed by means of a flap (14) shown in more detail in FIG. The proportion of recirculated air is mixed with fresh air, which is sucked due to the negative pressure in the drying drum (1) via the fresh air opening (15) on the back of the device. Fresh air content and recirculated air content are heated again via the arranged in the Heizkanalabschnitt (16) of the dry air guide heater (17) and re-introduced into the drying drum (1). Between the heating channel section (16) and rotating drying drum (1), a further sealing arrangement (18) is arranged. In the intermediate space between the fixed heating channel section (16) and rotating drying drum (1), a pressure sensor (20) which detects the pressure profile in the drying drum (1) is arranged in the air inlet region (19) of the drying air to the drying drum (1). The pressure profile is evaluated by the program control (21) of the tumble dryer for controlling the flap (14) arranged in the circulating air path (13). If it comes in the course of the drying process that laundry items (W) at the air outlet (2) of the drying drum (1) are sucked, the drying air flow in the drying drum (1) is interrupted. Depending on the deviation from the permissible pressure value or pressure profile in the drying drum (1), a control of the flap (14) arranged in the circulating air path (13) takes place. In this case, the recirculated air portion of the dry air is reduced or set equal to zero by the flap (14) is completely or partially closed by an adjusting device (22). The drying process is continued with reduced volume flow through the drying drum (1). When the flap (14) is completely closed, the volume flow of the dry air is reduced to the fixed proportion of the exhaust air volume flow predetermined by the arrangement of the guide plate (11). Depending on the reduced dry air flow, the heating power can be reduced or switched off completely.

In Figur 3 ist der Aufbau des Wäschetrockners mit den in Figur 1 und 2 beschriebenen erfindungswesentlichen Einzelheiten in perspektivischer Darstellung gezeigt.In Figure 3, the construction of the clothes dryer with the invention described in Figures 1 and 2 essential details is shown in a perspective view.

Claims (5)

  1. Method for drying laundry in a laundry drier with a program control device, a drying chamber and a process air guiding means, a fan for conveying the drying air through the drying chamber being disposed in the process air guiding means along with a heating device, wherein the process air guiding means is configured with a fresh air supply and an exhaust air discharge and wherein means to separate the drying air current into a discharge air portion and a re-circulating air portion are disposed in the process air guiding means, wherein the laundry drier includes sensors for detecting process parameters and, in dependence on the parameter detected, an actuation of the means for separating the drying air current is effected to obtain a modification of the exhaust air/re-circulating air, characterised in that a sensor (20) detects the pressure in the process air current in the air inlet region (19) of the drying air to the drying chamber (1) and in that an evaluation of the pressure value or of the pressure development is effected and, in dependence thereon, an actuation of the means (14, 22) for separating the drying air current is effected in such a manner that the re-circulating portion is reduced or is set equal to zero and the drying process is continued at reduced volume flow through the drying chamber (1).
  2. Method for drying laundry according to claim 1, characterised in that the heat output is reduced in dependence on the reduced volume flow of the drying air.
  3. Laundry drier for the accomplishment of the method according to claim 1, the said laundry drier having a program control device, a drying chamber and a process air guiding means, a fan for conveying the drying air through the drying chamber being disposed in the process air guiding means along with a heating device, wherein the process air guiding means is configured with a fresh air supply and an exhaust air discharge and wherein means to separate the drying air current into a discharge air portion and a re-circulating air portion are disposed in the process air guiding means, wherein the laundry drier includes sensors for detecting process parameters and, in dependence on the parameter detected, an actuation of the means for separating the drying air current is effected to obtain a modification of the exhaust air/re-circulating air, characterised in that a pressure sensor (20) is disposed in the air inlet region (19) of the drying air to the drying chamber (1) and the pressure or pressure development in the drying chamber (1) is detected by means of the said sensor, and in that a blocking flap (14) that is disposed in the process air duct (7) closes the re-circulating air path for the re-circulating air portion of the drying air in a total manner or a partial manner in dependence on the pressure value or the pressure development detected.
  4. Laundry drier according to claim 3, characterised in that the pressure sensor (20) is disposed in the intermediate space between fixed heating duct portion (16) and rotating drying drum (1).
  5. Laundry drier according to claim 4, characterised in that the pressure sensor (20) is disposed in the air inlet region (19) for the drying air into the drying chamber (1).
EP04790664A 2003-10-23 2004-10-20 Method for drying laundry and laundry dryer for carrying out said method Active EP1682715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10349712A DE10349712B4 (en) 2003-10-23 2003-10-23 Method for drying laundry and tumble dryer for performing the method
PCT/EP2004/011856 WO2005040483A1 (en) 2003-10-23 2004-10-20 Method for drying laundry and laundry dryer for carrying out said method

Publications (2)

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EP1682715A1 EP1682715A1 (en) 2006-07-26
EP1682715B1 true EP1682715B1 (en) 2007-07-11

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US (1) US20070039198A1 (en)
EP (1) EP1682715B1 (en)
AT (1) ATE366840T1 (en)
DE (2) DE10349712B4 (en)
WO (1) WO2005040483A1 (en)

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EP3854927A1 (en) 2020-01-23 2021-07-28 Miele & Cie. KG Laundry dryer
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EP3854927A1 (en) 2020-01-23 2021-07-28 Miele & Cie. KG Laundry dryer
DE102020101597A1 (en) 2020-01-23 2021-07-29 Miele & Cie. Kg Clothes dryer
DE102020101588A1 (en) 2020-01-23 2021-07-29 Miele & Cie. Kg Clothes dryer

Also Published As

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DE10349712A1 (en) 2005-06-09
DE502004004319D1 (en) 2007-08-23
WO2005040483A1 (en) 2005-05-06
EP1682715A1 (en) 2006-07-26
DE10349712B4 (en) 2007-03-01
US20070039198A1 (en) 2007-02-22
ATE366840T1 (en) 2007-08-15

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