EP3138951A1 - Assembly and method for feeding process air into a drum of a laundry drier - Google Patents

Assembly and method for feeding process air into a drum of a laundry drier Download PDF

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Publication number
EP3138951A1
EP3138951A1 EP16183133.4A EP16183133A EP3138951A1 EP 3138951 A1 EP3138951 A1 EP 3138951A1 EP 16183133 A EP16183133 A EP 16183133A EP 3138951 A1 EP3138951 A1 EP 3138951A1
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EP
European Patent Office
Prior art keywords
drum
process air
laundry
inflow region
air
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
EP16183133.4A
Other languages
German (de)
French (fr)
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EP3138951B1 (en
Inventor
Alexander Drebant
Andrea GÄRTLEIN
Gilbert Tay
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to PL16183133T priority Critical patent/PL3138951T3/en
Publication of EP3138951A1 publication Critical patent/EP3138951A1/en
Application granted granted Critical
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • 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
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • 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
    • D06F58/20—General details of domestic laundry dryers 
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/30—Drying processes 
    • 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
    • D06F2103/24—Spin speed; Drum movements
    • 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
    • D06F2105/32—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
    • 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

Definitions

  • the invention relates to an arrangement and a method for introducing process air into a laundry drum of a tumble dryer, the laundry drum comprising a drum shell rotatable about a longitudinal axis and a fixed drum rear wall, the drum rear wall having at least one inflow region through which process air flows into the laundry drum, and the local position of the inflow region is variable by means of a control device.
  • tumble dryer Essential performance indicators and thus optimization criteria for equipment for the treatment and drying of objects, in particular laundry (hereinafter generally referred to as tumble dryer) are the specific energy consumption and the specific drying time per kilogram of load.
  • the efficiency in the flow through of the objects to be dried with process air and the so-called volume flow rate of the process air have a significant influence on these performance indicators.
  • process air is to be understood as meaning air which is brought into contact with the objects to be dried in an environmentally-friendly or closed process air duct.
  • the process air is usually heated before it enters a treatment chamber (laundry drum) charged with articles to be dried, so that the process air subsequently absorbs moisture from the objects to be dried by releasing heat.
  • the process air leaves the treatment room moisture laden and is then removed as exhaust air or - which is energetically much cheaper and therefore prevalent - cooled in a closed process air cycle by subsequent heat extraction. During this cooling, the process air exhausts previously absorbed moisture as condensate.
  • the process air is heated (or heated up again, preferably using the heat previously extracted therefrom, for example by means of a heat pump system) and fed again to the treatment space.
  • the process air flow is usually generated by means of a blower or fan wheel.
  • Part of the flow resistance to be overcome for the process air is determined by the flow resistance in the process air duct or the objects contained in the treatment chamber.
  • the air resistance to be dried laundry depends on various factors, such as the type of laundry, the amount of laundry (loading state) and its moisture content and therefore may change during the drying process (with increasing degree of drying).
  • From the DE 40 32 079 A1 is a method for drying laundry in a program-controlled drum dryer known, the reversibly operable laundry drum is operated for different lengths in the main direction of rotation or the reverse direction of rotation as a function of the respective drying phase.
  • the EP 2 423 375 A1 discloses a clothes dryer optimized for the laundry drum structure and its serviceability by having a rear wall of the dryer housing having an outwardly extending bowl-shaped depression which, together with a circular, shell-like cover, forms a rear process air duct easily removable for maintenance.
  • an object of the invention is, in a clothes dryer, which is constructed according to the concept with a fixed drum rear wall and rotating drum shell about its longitudinal axis, to further optimize the process air flow and thus the efficiency or efficiency of the tumble dryer.
  • an alternating reversal of the direction of rotation of the drum shell is provided, wherein the control device changes the position of the air-guiding inflow depending on the alternating reversal of the direction of rotation of the drum shell.
  • the inflow region can also be formed by a plurality of inflow subregions.
  • An essential aspect of the invention is that the position of the currently active air-conducting inflow region is changed as a function of the reversal of the direction of rotation (reversing operation) of the drum shell.
  • a change (reversal) of the drum rotation direction during the drying process has proven to be very advantageous in many cases, both in terms of energy and time required and for the protection of the objects to be dried.
  • the present invention enables a substantially further energetic optimization step in that the process air introduction is controlled in an adapted manner to the drum rotation direction. Thus, the flow through the laundry in the laundry drum is further optimized.
  • the inflow of process air directed to the side or into the volume of the laundry drum before or in which the laundry is in free fall during rotation of the drum is particularly favorable in terms of process engineering. Accordingly, according to an advantageous embodiment of the invention, the position of the air-guiding inflow region is in each case selected such that it is located at least predominantly in the part of the drum rear wall in front of which the laundry falls due to gravity.
  • the air inlets for the incoming process air such that about 80% (main process air flow) of the process air is in the upper range, i. above the longitudinal axis of a horizontally oriented laundry drum, flow.
  • main process air flow main process air flow
  • an optimized arrangement or distribution of process air inflow openings in the lower region of the laundry drum has a particularly positive influence on the operating behavior and the drying efficiency. Accordingly, it is provided according to an advantageous development of the invention that the position of the air-guiding inflow region is overall predominantly below the longitudinal axis of the drum shell.
  • At least one further (partial) inflow region is located above the longitudinal axis of the drum shell.
  • This further inflow region can be designed such that it is completely closed, if necessary (with a low degree of loading), by the control, for example by means of a suitable flap or orifice.
  • the effective, i. actively air-guiding total cross-section of the inflow is variable.
  • the drying process can be further accelerated by the fact that at the beginning of the drying process, the warm-up phase for the process air is shortened by throttling the process air flow by reducing the total cross-section.
  • the overall cross-section is regulated in such a way that the volume flow of the process air flowing through the laundry drum remains approximately constant. This allows a particularly uniform and gentle material drying.
  • the invention further relates to a method for introducing process air into a laundry drum of a tumble dryer, the laundry drum comprises a drum shell rotatable about a longitudinal axis and a fixed drum rear wall, wherein the position of at least one inflow region in the drum rear wall, flows through the process air into the laundry drum, changeable , It is provided that the laundry drum operated by reversing the direction of rotation of the drum shell in reverse operation and that the position of the inflow is adjusted in response to the alternating reversal of the direction of rotation of the drum shell.
  • the Figures 1 and 2 show a schematic representation of an embodiment of a device generally hereinafter referred to as a tumble dryer 1 for drying objects.
  • the device has a housing 2, in which in known per se and described above a laundry drum 3 is mounted with a drum shell 4, which is rotatable about a longitudinal axis 5 oriented horizontally in this embodiment.
  • the housing 2 has a front side 6 and a rear side 7.
  • a charging opening 8 is provided, which can be closed by a loading door 9 and by the not shown objects to be dried (eg laundry) in one of the interior of the laundry drum 3
  • Treatment room 10 can be introduced.
  • drivers 11 are provided, which raise the laundry to be dried against gravity until the laundry due to gravity falls back into deeper areas of the laundry drum.
  • the loading door 9 is sealed by a ring seal 12 with respect to the drum shell 4.
  • a schematically illustrated air duct 14 is provided for inflowing into the treatment chamber 10, symbolized by arrows process air 15.
  • the process air 15 is conveyed by a fan 16, which is driven by a drive motor 18.
  • the process air flows in a closed process air cycle and is heated by a heater, not shown, before it enters the treatment chamber 10.
  • the motor 18 drives a belt 22, which partially wraps around the drum casing 4 on the outside and thereby sets the laundry drum 3 or the drum casing 4 in rotation about the axis 5.
  • the drum shell 4 is sealed by a rear annular seal 27 with respect to a drum rear wall 30 and the air guide 14.
  • the air guide 14 is used for guiding and introducing the process air 15 through the rear portion of the laundry drum, namely by the fixedly arranged drum rear wall 30.
  • control elements 31 of a control device 33 are provided at the drum rear wall.
  • the control elements may be formed, for example, by sliders 31 or cover panels 32.
  • flow openings or perforations 35, 36, 37 are introduced, which, as explained in greater detail, can be released or closed by the control 33.
  • the controls used for this purpose can be designed such as in the US 2012/0011738 A1 described and used in a conventional manner for on-demand release or closing air-conducting inflow, which can be formed by holes, slots and the like.
  • the drive motor 18 (FIG. FIG. 1 ) are operated left- or right-handed. This allows an as needed alternating reversal of the direction of rotation 45 of the drum shell 4.
  • the respective operating state is shown schematically in the direction of the drum rear wall 30.
  • the drum shell 4 is driven by the motor 18 clockwise in this operating state.
  • the fan 16 conveys process air through the air duct 14 to the perforations 35, 36, 37 formed in the drum rear wall 30.
  • the control element 31 is actuated by the control device 33 from its original position "6 o'clock position" P6 (FIG. FIG.
  • the process air-introducing inflow region 41 is changed or repositioned in its size and position 51 relative to the treatment space 10.
  • the inflow region 42 is expanded by releasing further perforations 37 to form a larger, actively air-permeable surface, ie the inflow region 42 is changed or repositioned in its size and thus in its centroid and thus in its position 52 relative to the drum rear wall 30 or the laundry drum 3 ,
  • the upper inflow region 40 is not acted upon by a control element in this exemplary embodiment or in its position 53 unchanged.
  • the laundry by the driver 11 FIG.
  • FIG. 4 shows the operation of the clothes dryer 1 with respect to in FIG. 3 illustrated situation opposite direction of rotation 60 of the drum shell 4 (so-called Reversier réelle 61).
  • the control element 31 is opposed by the control device 33 FIG. 3 pivoted counterclockwise in the right portion 58 of the drum rear wall 30 in the "5 o'clock position" P5.
  • the actively air-guiding inflow regions 41, 42 are opposite to the situation in FIG FIG. 3 significantly increased or decreased and brought in their resulting effective position (centroid) in the positions 62 and 63.
  • FIGS. 5 and 6 show in essence the situation in the FIGS. 3 and 4 corresponding operating situations, the release (air-carrying) or the complete closure (not air-conducting) of the above-described perforations 36, 37 and thus the local variability of the inflow 41, 42.
  • the inflow region 42 changes to the exclusively air-guiding inflow region, while all other potential inflow possibilities described above (Perforations 35, 36) by the control device 33 and corresponding only indicated controls, namely the aperture 31 and the aperture 32 for complete coverage of the perforations 35, are completely closed.
  • FIG. 6 shows in the counterclockwise direction of rotation 60 the situation such that the active air-guiding inflow area is placed or positioned alone in the inflow area 41, while the remaining perforations 35, 37 (FIG. FIGS. 3 and 4 ) are completely closed. Thus, in this situation, only a single active air-guiding inflow area is formed.
  • the diaphragms can additionally be set and regulated in such a way that an approximately constant process air volume flow is always ensured in compensation for changing operating parameters (for example the degree of moisture of the laundry).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Die Erfindung bezieht sich auf eine Anordnung und ein Verfahren zum Einleiten von Prozessluft in eine Wäschetrommel eines Wäschetrockners, wobei die Wäschetrommel 3 einen um eine Längsachse 5 drehbaren Trommelmantel 4 und eine feststehende Trommelrückwand 30 umfasst, wobei die Trommelrückwand 30 wenigstens einen Einströmbereich 40, 41, 42 aufweist, durch den Prozessluft 15 in die Wäschetrommel 3 einströmt, und wobei die örtliche Position 51, 52, 53 des Einströmbereichs 41, 42 mittels einer Steuereinrichtung 33 veränderbar ist. Um die Prozessluftführung und damit die Leistungsfähigkeit bzw. Effizienz des Wäschetrockners weiter zu optimieren, ist vorgesehen, dass die Drehrichtung 45 des Trommelmantels 4 bedarfsweise umkehrbar ist, und dass die Steuereinrichtung 33 die Position des luftführenden Einströmbereichs 40, 41, 42 in Abhängigkeit von der Drehrichtung 50, 60 ändert.The invention relates to an arrangement and a method for introducing process air into a laundry drum of a tumble dryer, wherein the laundry drum 3 comprises a drum shell 4 rotatable about a longitudinal axis 5 and a fixed drum rear wall 30, the drum rear wall 30 having at least one inflow area 40, 41, 42, flows through the process air 15 in the laundry drum 3, and wherein the local position 51, 52, 53 of the inflow 41, 42 by means of a control device 33 is variable. In order to further optimize the process air flow and thus the efficiency or efficiency of the tumble dryer, it is provided that the direction of rotation 45 of the drum shell 4 is reversible as needed, and that the control device 33, the position of the air-conducting inflow region 40, 41, 42 in dependence on the direction of rotation 50, 60 changes.

Description

Die Erfindung bezieht sich auf eine Anordnung und ein Verfahren zum Einleiten von Prozessluft in eine Wäschetrommel eines Wäschetrockners, wobei die Wäschetrommel einen um eine Längsachse drehbaren Trommelmantel und eine feststehende Trommelrückwand umfasst, die Trommelrückwand wenigstens einen Einströmbereich aufweist, durch den Prozessluft in die Wäschetrommel einströmt, und die örtliche Position des Einströmbereichs mittels einer Steuereinrichtung veränderbar ist.The invention relates to an arrangement and a method for introducing process air into a laundry drum of a tumble dryer, the laundry drum comprising a drum shell rotatable about a longitudinal axis and a fixed drum rear wall, the drum rear wall having at least one inflow region through which process air flows into the laundry drum, and the local position of the inflow region is variable by means of a control device.

Wesentliche Leistungskennzahlen und damit Optimierungskriterien bei Geräten zur Behandlung und zum Trocknen von Gegenständen, insbesondere Wäsche, (nachfolgend allgemein Wäschetrockner genannt) sind der spezifische Energieverbrauch und die spezifische Trocknungszeit pro Kilogramm Beladung. Wesentlichen Einfluss auf diese Leistungskennzahlen haben die Effizienz bei der Durchströmung der zu trocknenden Gegenstände mit Prozessluft und die sogenannte Volumenstromrate der Prozessluft.Essential performance indicators and thus optimization criteria for equipment for the treatment and drying of objects, in particular laundry (hereinafter generally referred to as tumble dryer) are the specific energy consumption and the specific drying time per kilogram of load. The efficiency in the flow through of the objects to be dried with process air and the so-called volume flow rate of the process air have a significant influence on these performance indicators.

Unter Prozessluft ist im Rahmen der vorliegenden Erfindung Luft zu verstehen, die in einer umgebungsoffenen oder geschlossenen Prozessluftführung in Kontakt mit den zu trocknenden Gegenständen gebracht wird. Dabei wird die Prozessluft üblicherweise vor ihrem Eintritt in einen mit zu trocknenden Gegenständen beschickten Behandlungsraum (Wäschetrommel) aufgeheizt, so dass die Prozessluft anschließend durch Abgabe von Wärme gleichzeitig Feuchtigkeit von den zu trocknenden Gegenständen aufnimmt. Die Prozessluft verlässt den Behandlungsraum feuchtigkeitsbeladen und wird anschließend als Abluft abgeführt oder - was energetisch wesentlich günstiger und deshalb vorherrschend ist - in einem geschlossenen Prozessluftkreislauf durch anschließenden Wärmeentzug abgekühlt. Bei dieser Abkühlung scheidet die Prozessluft zuvor aufgenommene Feuchtigkeit als Kondensat wieder ab. Anschließend wird die Prozessluft (vorzugsweise unter Verwendung der ihr zuvor entzogenen Wärme beispielsweise mittels eines Wärmepumpensystems) wieder erwärmt bzw. aufgeheizt und dem Behandlungsraum erneut zugeführt. Die Prozessluftströmung wird üblicherweise mithilfe eines Gebläses oder Lüfterrades erzeugt.In the context of the present invention, process air is to be understood as meaning air which is brought into contact with the objects to be dried in an environmentally-friendly or closed process air duct. In this case, the process air is usually heated before it enters a treatment chamber (laundry drum) charged with articles to be dried, so that the process air subsequently absorbs moisture from the objects to be dried by releasing heat. The process air leaves the treatment room moisture laden and is then removed as exhaust air or - which is energetically much cheaper and therefore prevalent - cooled in a closed process air cycle by subsequent heat extraction. During this cooling, the process air exhausts previously absorbed moisture as condensate. Subsequently, the process air is heated (or heated up again, preferably using the heat previously extracted therefrom, for example by means of a heat pump system) and fed again to the treatment space. The process air flow is usually generated by means of a blower or fan wheel.

Ein Teil des dabei zu überwindenden Strömungswiderstandes für die Prozessluft ist durch die Strömungswiderstände in der Prozessluftführung bzw. die in dem Behandlungsraum enthaltenen Gegenstände bestimmt. Der Luftwiderstand zu trocknender Wäsche hängt von verschiedenen Faktoren ab, beispielsweise der Wäscheart, der Wäschemenge (Beladungszustand) und ihrem Feuchtegehalt und kann sich deshalb während des Trocknungsprozesses (mit zunehmendem Trocknungsgrad) verändern.Part of the flow resistance to be overcome for the process air is determined by the flow resistance in the process air duct or the objects contained in the treatment chamber. The air resistance to be dried laundry depends on various factors, such as the type of laundry, the amount of laundry (loading state) and its moisture content and therefore may change during the drying process (with increasing degree of drying).

Die vorstehend erläuterten Wäschetrocknerkonzepte sind z.B. aus der EP 2 157 230 A1 bekannt, die ein fertigungstechnisch optimiertes Plattformsystem von Trocknern beschreibt, die je nach Bedarf verschiedene Prozessluftmanagementkonzepte realisieren.The above-explained Wäschetrocknerkonzepte are for example from the EP 2 157 230 A1 known, which describes a production-optimized platform system of dryers, which realize different process air management concepts as needed.

Aus der DE 40 32 079 A1 ist ein Verfahren zum Trocknen von Wäsche in einem programmgesteuerten Trommeltrockner bekannt, dessen reversierbar betreibbare Wäschetrommel in Abhängigkeit der jeweiligen Trocknungsphase unterschiedlich lange in der Hauptdrehrichtung bzw. der Gegendrehrichtung betrieben wird.From the DE 40 32 079 A1 is a method for drying laundry in a program-controlled drum dryer known, the reversibly operable laundry drum is operated for different lengths in the main direction of rotation or the reverse direction of rotation as a function of the respective drying phase.

Aus der US 3,309,783 ist ein Wäschetrockner bekannt, der es dem Nutzer ermöglicht, je nach Beladungssituation manuell einen unidirektionalen oder zyklisch reversierenden Antrieb der Wäschetrommel einzustellen.From the US 3,309,783 a tumble dryer is known, which allows the user to manually adjust depending on the loading situation a unidirectional or cyclically reversing drive the laundry drum.

Die EP 2 423 375 A1 offenbart einen Wäschetrockner, der hinsichtlich der Wäschetrommelstruktur und seiner Wartungsfreundlichkeit optimiert ist, indem eine Rückwand des Trocknergehäuses eine sich nach außen erstreckende beckenförmige Vertiefung aufweist, die zusammen mit einer kreisförmigen, schalenartigen Abdeckung eine rückwärtige, leicht zu Wartungszwecken entfernbare Prozessluftführung bildet.The EP 2 423 375 A1 discloses a clothes dryer optimized for the laundry drum structure and its serviceability by having a rear wall of the dryer housing having an outwardly extending bowl-shaped depression which, together with a circular, shell-like cover, forms a rear process air duct easily removable for maintenance.

Eine Anordnung und ein Verfahren der eingangs genannten Art gehen aus der US 2012/0011738 A1 hervor, die einen mit zu trocknenden Gegenständen beschickbaren Behandlungsraum (Wäschetrommel) mit einem Einströmbereich für die Prozessluft beschreibt, der strömungstechnisch mit der Wäschetrommel verbunden ist. Der Einströmbereich weist einen adjustierbaren Strömungsverminderer auf, der so ausgebildet ist, dass er den effektiven, also aktiv luftführenden Bereich des Einströmbereichs variieren kann. Dazu kann eine Irisblende oder eine plane Blende vorgesehen sein, die in der Trommelrückwand ausgebildete Perforationen teilweise oder abschnittsweise abdeckt.An arrangement and a method of the type mentioned go from the US 2012/0011738 A1 which describes a treatment space (laundry drum), which can be charged with articles to be dried, with an inflow region for the process air, which is fluidically connected to the laundry drum. The inflow region has an adjustable flow reducer, which is designed such that it can vary the effective, ie actively air-conducting, region of the inflow region. For this purpose, an iris diaphragm or a flat diaphragm can be provided which partially or partially covers the perforations formed in the drum rear wall.

Vor diesem Hintergrund besteht eine Aufgabe der Erfindung darin, bei einem Wäschetrockner, der nach dem Konzept mit feststehender Trommelrückwand und um seine Längsachse rotierendem Trommelmantel aufgebaut ist, die Prozessluftführung und damit die Leistungsfähigkeit bzw. Effizienz des Wäschetrockners weiter zu optimieren.Against this background, an object of the invention is, in a clothes dryer, which is constructed according to the concept with a fixed drum rear wall and rotating drum shell about its longitudinal axis, to further optimize the process air flow and thus the efficiency or efficiency of the tumble dryer.

Diese Aufgabe wird hinsichtlich einer Anordnung und hinsichtlich eines Verfahrens mit einem Verfahren mit den Merkmalen des jeweiligen unabhängigen Patentanspruchs. Weitere Aspekte und Vorteile der Erfindung ergeben sich aus den weiteren Patentansprüchen, der nachfolgenden Beschreibung und den Figuren, wobei einzelne Aspekte und Merkmale einzeln und in Verbindung miteinander anwendbar sind.This object is achieved with regard to an arrangement and with regard to a method having a method having the features of the respective independent patent claim. Other aspects and advantages of the invention will become apparent from the further claims, the following description and the figures, wherein individual aspects and features are individually and in conjunction with each other applicable.

Demgemäß ist bei einer Vorrichtung der eingangs genannten Art erfindungsgemäß eine alternierende Umkehr der Drehrichtung des Trommelmantels vorgesehen, wobei die Steuereinrichtung die Position des luftführenden Einströmbereichs in Abhängigkeit von der alternierenden Umkehr der Drehrichtung des Trommelmantels ändert. Der Einströmbereich kann dabei auch von mehreren Einström-Teilbereichen gebildet sein.Accordingly, in an apparatus of the type mentioned in the invention, an alternating reversal of the direction of rotation of the drum shell is provided, wherein the control device changes the position of the air-guiding inflow depending on the alternating reversal of the direction of rotation of the drum shell. The inflow region can also be formed by a plurality of inflow subregions.

Auch wenn die Erfindung im Folgenden mit besonderem Bezug auf einen Wäschetrockner beschrieben wird, bleibt sie allgemein auf eine Anordnung und ein Verfahren zum Einleiten von Prozessluft in einen mit zu trocknenden Gegenständen beschickbaren Behandlungsraum eines Trockners gerichtet.Although the invention will be described below with particular reference to a tumble dryer, it generally remains directed to an arrangement and method for introducing process air into a dryer-treatable treatment room for drying articles.

Ein wesentlicher Aspekt der Erfindung besteht darin, dass die Position des gerade aktiv luftführenden Einströmbereichs in Abhängigkeit von der Umkehr der Drehrichtung (Reversierbetrieb) des Trommelmantels geändert wird. Eine Änderung (Umkehr) der Trommeldrehrichtung während des Trocknungsprozesses hat sich nämlich in vielen Fällen sowohl hinsichtlich des Energie- und Zeitbedarfs als auch für die Schonung der zu trocknenden Gegenstände als sehr vorteilhaft erwiesen. Die vorliegende Erfindung ermöglicht hier einen wesentlichen weiteren energetischen Optimierungsschritt, indem die Prozesslufteinleitung an die Trommeldrehrichtung angepasst gesteuert wird. Damit ist die Durchströmung der Wäsche in der Wäschetrommel weiter optimiert. Es hat sich nämlich überraschenderweise gezeigt, dass bestimmte Positionen in der Trommelrückwand für das Einströmen der Prozessluft besonders vorteilhaft sind und mit der Erfindung gelingt es, diese vorteilhafte Positionierung in Bezug auf den Wäschetrommelboden (feststehende Rückwand) in allen Betriebssituationen, also in Anpassung an die aktuelle Trommeldrehrichtung, zu gewährleisten. Durch die variable Prozesslufteinströmung ist sichergestellt, dass die Wäsche auch im Reversierbetrieb optimal angeströmt und somit durch optimierten Kontakt mit der Prozessluft besonders gut entfeuchtet wird.An essential aspect of the invention is that the position of the currently active air-conducting inflow region is changed as a function of the reversal of the direction of rotation (reversing operation) of the drum shell. A change (reversal) of the drum rotation direction during the drying process has proven to be very advantageous in many cases, both in terms of energy and time required and for the protection of the objects to be dried. The present invention enables a substantially further energetic optimization step in that the process air introduction is controlled in an adapted manner to the drum rotation direction. Thus, the flow through the laundry in the laundry drum is further optimized. It has surprisingly been found that certain positions in the drum rear wall for the inflow of process air are particularly advantageous and with the invention succeeds, this advantageous positioning with respect to the laundry drum bottom (fixed rear wall) in all operating situations, ie to ensure adaptation to the current drum rotation direction. Due to the variable process air inflow, it is ensured that the laundry is optimally flown even in reversing operation and thus is particularly well dehumidified by optimized contact with the process air.

Aus Versuchen hat sich überraschenderweise ergeben, dass das auf die Seite bzw. in das Volumen der Wäschetrommel, vor der bzw. in dem sich die Wäsche bei Rotation der Trommel im freien Fall befindet, gerichtete Einströmen von Prozessluft verfahrenstechnisch besonders günstig ist. Demgemäß ist nach einer vorteilhaften Ausgestaltung der Erfindung die Position des luftführenden Einströmbereichs jeweils so gewählt, dass er sich zumindest überwiegend in dem Teil der Trommelrückwand befindet, vor dem die Wäsche schwerkraftbedingt herabfällt.It has surprisingly been found from experiments that the inflow of process air directed to the side or into the volume of the laundry drum before or in which the laundry is in free fall during rotation of the drum is particularly favorable in terms of process engineering. Accordingly, according to an advantageous embodiment of the invention, the position of the air-guiding inflow region is in each case selected such that it is located at least predominantly in the part of the drum rear wall in front of which the laundry falls due to gravity.

Ausgehend von konventionellen Trommelkonzepten, insbesondere mit rotierender Trommelrückwand, hätte es naheliegen können, die Lufteinlässe für die einströmende Prozessluft so anzuordnen, dass etwa 80 % (Hauptprozessluftstrom) der Prozessluft im oberen Bereich, d.h. oberhalb der Längsachse einer horizontal orientierten Wäschetrommel, einströmen. Es hat sich aber überraschenderweise gezeigt, dass eine optimierte Anordnung bzw. Verteilung von Prozesslufteinströmöffnungen im unteren Bereich der Wäschetrommel einen besonders positiven Einfluss auf das Betriebsverhalten und die Trocknungseffizienz hat. Demgemäß ist nach einer vorteilhaften Fortbildung der Erfindung vorgesehen, dass sich die Position des luftführenden Einströmbereichs insgesamt überwiegend unterhalb der Längsachse des Trommelmantels befindet.Starting from conventional drum concepts, particularly with rotating drum back wall, it might have been convenient to arrange the air inlets for the incoming process air such that about 80% (main process air flow) of the process air is in the upper range, i. above the longitudinal axis of a horizontally oriented laundry drum, flow. However, it has surprisingly been found that an optimized arrangement or distribution of process air inflow openings in the lower region of the laundry drum has a particularly positive influence on the operating behavior and the drying efficiency. Accordingly, it is provided according to an advantageous development of the invention that the position of the air-guiding inflow region is overall predominantly below the longitudinal axis of the drum shell.

Um insbesondere bei sehr hohem Beladungsgrad der Wäschetrommel ausgezeichnete und schnelle Trocknungsergebnisse zu erzielen, ist nach einer bevorzugten Weiterbildung der Erfindung vorgesehen, dass sich oberhalb der Längsachse des Trommelmantels zumindest ein weiterer (Teil-)Einströmbereich befindet. Dieser weitere Einströmbereich kann so gestaltet sein, dass er bedarfsweise (bei niedrigem Beladungsgrad) von der Steuerung z.B. mittels einer geeigneten Klappe oder Blende vollständig geschlossen ist.In order to achieve excellent and rapid drying results, particularly in the case of a very high degree of loading of the laundry drum, according to a preferred development of the invention, at least one further (partial) inflow region is located above the longitudinal axis of the drum shell. This further inflow region can be designed such that it is completely closed, if necessary (with a low degree of loading), by the control, for example by means of a suitable flap or orifice.

Nach einer weiteren bevorzugten Fortbildung der Erfindung ist vorgesehen, dass der wirksame, d.h. aktiv luftführende Gesamtquerschnitt des Einströmbereichs veränderbar ist. Der Trocknungsprozess kann dadurch weiter beschleunigt werden, dass zu Beginn des Trocknungsprozesses die Aufwärmphase für die Prozessluft verkürzt wird, indem durch Verminderung des Gesamtquerschnitts der Prozessluftstrom gedrosselt wird.According to a further preferred embodiment of the invention it is provided that the effective, i. actively air-guiding total cross-section of the inflow is variable. The drying process can be further accelerated by the fact that at the beginning of the drying process, the warm-up phase for the process air is shortened by throttling the process air flow by reducing the total cross-section.

Nach einer bevorzugten Weiterbildung der Erfindung erfolgt eine Regelung des Gesamtquerschnitts derart, dass der Volumenstrom der durch die Wäschetrommel strömenden Prozessluft annähernd konstant bleibt. Dies ermöglicht eine besonders gleichmäßige und materialschonende Trocknung.According to a preferred development of the invention, the overall cross-section is regulated in such a way that the volume flow of the process air flowing through the laundry drum remains approximately constant. This allows a particularly uniform and gentle material drying.

Die Erfindung betrifft ferner ein Verfahren zum Einleiten von Prozessluft in eine Wäschetrommel eines Wäschetrockners, dessen Wäschetrommel einen um eine Längsachse drehbaren Trommelmantel und eine feststehende Trommelrückwand umfasst, wobei die Position mindestens eines Einströmungsbereichs in der Trommelrückwand, durch den Prozessluft in die Wäschetrommel strömt, veränderbar ist. Dabei ist vorgesehen, dass die Wäschetrommel durch alternierende Umkehr der Drehrichtung des Trommelmantels im Reversierbetrieb betrieben und dass die Position des Einströmbereichs in Abhängigkeit von der alternierenden Umkehr der Drehrichtung des Trommelmantels angepasst wird.The invention further relates to a method for introducing process air into a laundry drum of a tumble dryer, the laundry drum comprises a drum shell rotatable about a longitudinal axis and a fixed drum rear wall, wherein the position of at least one inflow region in the drum rear wall, flows through the process air into the laundry drum, changeable , It is provided that the laundry drum operated by reversing the direction of rotation of the drum shell in reverse operation and that the position of the inflow is adjusted in response to the alternating reversal of the direction of rotation of the drum shell.

Die Erfindung wird nachfolgend anhand zeichnerisch dargestellter Ausführungsbeispiele weiter erläutert, wobei die nachfolgend dargestellten und beschriebenen Merkmale sowohl jeweils für sich genommen als auch in unterschiedlichster Kombination miteinander Aspekte der Erfindung darstellen können. Es zeigen in der beigefügten Zeichnung:

  • Fig. 1 schematisch eine Längsschnittdarstellung eines Ausführungsbeispiels der hierin neu beschriebenen Anordnung anhand eines Haushaltsgeräts mit feststehender Trommelrückwand,
  • Fig. 2 einen Schnitt entlang der Linie II-II in Figur 1,
  • Fig. 3 und
  • Fig. 4 in Darstellung eines Schnitts entlang der Linie II-II in Figur 1 jeweils Betriebszustände des Ausführungsbeispiels nach Figur 1,
  • Fig. 5 und
  • Fig. 6 eine alternative Ausgestaltung der hierin neu beschriebenen Anordnung sowie
  • Fig. 7 schematisch ein Ablaufbeispiel des hierin neu beschriebenen Verfahrens.
The invention will be explained in more detail below with reference to illustrative embodiments, wherein the features shown and described below, both individually and in a wide variety of combinations, may constitute aspects of the invention. In the attached drawing:
  • Fig. 1 FIG. 2 schematically a longitudinal sectional view of an embodiment of the arrangement newly described herein with reference to a domestic appliance with a fixed drum rear wall, FIG.
  • Fig. 2 a section along the line II-II in FIG. 1 .
  • Fig. 3 and
  • Fig. 4 in representation of a section along the line II-II in FIG. 1 each operating states of the embodiment according to FIG. 1 .
  • Fig. 5 and
  • Fig. 6 an alternative embodiment of the arrangement newly described herein as well
  • Fig. 7 schematically a flow example of the method newly described herein.

In den Figuren sind funktionsgleiche oder einander entsprechende Bauteile jeweils mit denselben Bezugszeichen versehen.In the figures, functionally identical or corresponding components are each provided with the same reference numerals.

Die Figuren 1 und 2 zeigen in schematischer Darstellung ein Ausführungsbeispiel eines nachfolgend allgemein als Wäschetrockner 1 bezeichneten Geräts zum Trocknen von Gegenständen. Das Gerät hat ein Gehäuse 2, in dem in an sich bekannter und eingangs beschriebener Weise eine Wäschetrommel 3 mit einem Trommelmantel 4 gelagert ist, der um eine in diesem Ausführungsbeispiel horizontal orientierte Längsachse 5 drehbar ist. Das Gehäuse 2 hat eine Vorderseite 6 und eine Rückseite 7. In der Vorderseite 6 ist eine Beschickungsöffnung 8 vorgesehen, die durch eine Beschickungstür 9 verschließbar ist und durch die nicht näher dargestellte zu trocknende Gegenstände (z.B. Wäsche) in einen vom Inneren der Wäschetrommel 3 gebildeten Behandlungsraum 10 einbringbar sind. Im Behandlungsraum 10 sind Mitnehmer 11 vorgesehen, die die zu trocknende Wäsche entgegen der Schwerkraft so weit anheben, bis die Wäsche schwerkraftbedingt wieder in tiefere Bereiche der Wäschetrommel zurückfällt.The Figures 1 and 2 show a schematic representation of an embodiment of a device generally hereinafter referred to as a tumble dryer 1 for drying objects. The device has a housing 2, in which in known per se and described above a laundry drum 3 is mounted with a drum shell 4, which is rotatable about a longitudinal axis 5 oriented horizontally in this embodiment. The housing 2 has a front side 6 and a rear side 7. In the front 6, a charging opening 8 is provided, which can be closed by a loading door 9 and by the not shown objects to be dried (eg laundry) in one of the interior of the laundry drum 3 Treatment room 10 can be introduced. In the treatment room 10 drivers 11 are provided, which raise the laundry to be dried against gravity until the laundry due to gravity falls back into deeper areas of the laundry drum.

In geschlossenem Zustand ist die Beschickungstür 9 über eine Ringdichtung 12 gegenüber dem Trommelmantel 4 abgedichtet. An der Rückseite 7 ist eine schematisch dargestellte Luftführung 14 für in den Behandlungsraum 10 einströmende, durch Pfeile symbolisierte Prozessluft 15 vorgesehen. Die Prozessluft 15 wird durch ein Gebläse 16 gefördert, das von einem Antriebsmotor 18 angetrieben ist. Die Prozessluft strömt wie eingangs erläutert in einem geschlossenen Prozessluftkreislauf und wird vor Eintritt in den Behandlungsraum 10 durch eine nicht näher dargestellte Heizung erhitzt. Über eine Antriebswelle mit einer Riemenscheibe 20 treibt der Motor 18 einen Riemen 22 an, der den Trommelmantel 4 außenseitig teilweise umschlingt und dadurch die Wäschetrommel 3 bzw. den Trommelmantel 4 in Rotation um die Achse 5 versetzt. Der Trommelmantel 4 ist über eine rückwärtige Ringdichtung 27 gegenüber einer Trommelrückwand 30 bzw. der Luftführung 14 abgedichtet.In the closed state, the loading door 9 is sealed by a ring seal 12 with respect to the drum shell 4. On the back 7 a schematically illustrated air duct 14 is provided for inflowing into the treatment chamber 10, symbolized by arrows process air 15. The process air 15 is conveyed by a fan 16, which is driven by a drive motor 18. As already explained, the process air flows in a closed process air cycle and is heated by a heater, not shown, before it enters the treatment chamber 10. Via a drive shaft with a belt pulley 20, the motor 18 drives a belt 22, which partially wraps around the drum casing 4 on the outside and thereby sets the laundry drum 3 or the drum casing 4 in rotation about the axis 5. The drum shell 4 is sealed by a rear annular seal 27 with respect to a drum rear wall 30 and the air guide 14.

Wie die Figuren 1 und 2 in Zusammenschau verdeutlichen, dient die Luftführung 14 zum Führen und Einleiten der Prozessluft 15 durch den rückwärtigen Bereich der Wäschetrommel, nämlich durch die feststehend angeordnete Trommelrückwand 30. An der Trommelrückwand sind Steuerelemente 31 einer Steuereinrichtung 33 vorgesehen. Die Steuerelemente können beispielsweise von Schiebern 31 oder Abdeckblenden 32 gebildet sein. In Teilbereichen der Trommelrückwand sind Durchströmöffnungen oder Perforationen 35, 36, 37 eingebracht, die wie noch näher erläutert von der Steuerung 33 freigegeben oder verschlossen werden können. Die dazu verwendeten Steuerelemente können so ausgebildet sein, wie z.B. in der US 2012/0011738 A1 beschrieben und dienen in an sich bekannter Weise zum bedarfsweisen Freigeben bzw. Verschließen luftführender Einströmbereiche, die durch Bohrungen, Schlitze und dgl. oder wie im Ausführungsbeispiel durch Perforationen gebildet sein können. In der in Figur 1 und 2 dargestellten Situation sind (noch) alle Perforationen 35, 36, 37 unabgedeckt, so dass alle so gebildeten Einströmbereiche 40, 41, 42 von der Prozessluft 15 durchströmbar sind. Die Einströmbereiche 41, 42 befinden sich dabei unterhalb der Längsachse 5, während der Einströmbereich 40 oberhalb der Längsachse 5 angeordnet ist.As the Figures 1 and 2 clarify in sync, the air guide 14 is used for guiding and introducing the process air 15 through the rear portion of the laundry drum, namely by the fixedly arranged drum rear wall 30. At the drum rear wall control elements 31 of a control device 33 are provided. The control elements may be formed, for example, by sliders 31 or cover panels 32. In partial areas of the drum rear wall flow openings or perforations 35, 36, 37 are introduced, which, as explained in greater detail, can be released or closed by the control 33. The controls used for this purpose can be designed such as in the US 2012/0011738 A1 described and used in a conventional manner for on-demand release or closing air-conducting inflow, which can be formed by holes, slots and the like. Or as in the embodiment by perforations. In the in FIGS. 1 and 2 All the perforations 35, 36, 37 are (still) uncovered, so that all inflow regions 40, 41, 42 thus formed can be flowed through by the process air 15. The inflow regions 41, 42 are located below the longitudinal axis 5, while the inflow region 40 is arranged above the longitudinal axis 5.

Wie die Figuren 3 und 4 verdeutlichen, kann der Antriebsmotor 18 (Figur 1) links- oder rechtsdrehend betrieben werden. Dies ermöglicht eine bedarfsweise alternierende Umkehr der Drehrichtung 45 des Trommelmantels 4. Dazu ist schematisch der jeweilige Betriebszustand mit Blick in Richtung auf die Trommelrückwand 30 dargestellt. Wie der Pfeil 50 in Figur 3 symbolisiert, ist in diesem Betriebszustand der Trommelmantel 4 rechtsdrehend durch den Motor 18 angetrieben. Das Gebläse 16 fördert durch die Luftführung 14 Prozessluft zu den in der Trommelrückwand 30 ausgebildeten Perforationen 35, 36, 37. Das Steuerelement 31 ist in dieser Situation durch die Steuereinrichtung 33 von seiner Ursprungsstellung "6-Uhr-Position" P6 (Figur 2) in eine "7-Uhr-Position" P7 (Figur 3) bewegt worden und überdeckt damit nun einen großen Teil der Perforationen 36. Damit ist der Prozessluft einleitende Einströmbereich 41 in seiner Größe und Position 51 relativ zu dem Behandlungsraum 10 verändert bzw. repositioniert. Gleichzeitig ist der Einströmbereich 42 durch Freigabe weiterer Perforationen 37 zu einer größeren aktiv luftdurchlässigen Fläche erweitert, d.h. der Einströmbereich 42 ist in seiner Größe und damit in seinem Flächenschwerpunkt und somit in seiner Position 52 relativ zur Trommelrückwand 30 bzw. der Wäschetrommel 3 verändert bzw. repositioniert. Der obere Einströmbereich 40 ist in diesem Ausführungsbeispiel nicht von einem Steuerelement beaufschlagt bzw. in seiner Position 53 unverändert. Bei der dargestellten Drehrichtung 50 wird die Wäsche durch die Mitnehmer 11 (Figur 1) auf ein Niveau zwischen "11-Uhr-Position" P11 und "12-Uhr-Position" P12 angehoben und fällt dann überwiegend vor dem rechten Bereich bzw. der rechten Hälfte 58 der Trommelrückwand 30 schwerkraftbedingt herab. Bei dieser herabfallenden Bewegung gelangt die nicht dargestellte Wäsche mit einem erheblichen Anteil der Prozessluft in Kontakt, die aus dem aktiv luftführenden, repositionierten Einströmbereich 42 in die Wäschetrommel 3 strömt.As the FIGS. 3 and 4 clarify, the drive motor 18 (FIG. FIG. 1 ) are operated left- or right-handed. This allows an as needed alternating reversal of the direction of rotation 45 of the drum shell 4. For this purpose, the respective operating state is shown schematically in the direction of the drum rear wall 30. Like the arrow 50 in FIG FIG. 3 symbolizes, the drum shell 4 is driven by the motor 18 clockwise in this operating state. The fan 16 conveys process air through the air duct 14 to the perforations 35, 36, 37 formed in the drum rear wall 30. In this situation, the control element 31 is actuated by the control device 33 from its original position "6 o'clock position" P6 (FIG. FIG. 2 ) into a "7 o'clock position" P7 ( FIG. 3 ) and thus now covers a large part of the perforations 36. Thus, the process air-introducing inflow region 41 is changed or repositioned in its size and position 51 relative to the treatment space 10. At the same time, the inflow region 42 is expanded by releasing further perforations 37 to form a larger, actively air-permeable surface, ie the inflow region 42 is changed or repositioned in its size and thus in its centroid and thus in its position 52 relative to the drum rear wall 30 or the laundry drum 3 , The upper inflow region 40 is not acted upon by a control element in this exemplary embodiment or in its position 53 unchanged. In the illustrated direction of rotation 50, the laundry by the driver 11 ( FIG. 1 ) is raised to a level between " 11 o'clock position " P11 and " 12 o'clock position " P12, and then falls down gravitationally mainly in front of the right and right halves 58 of the drum rear wall 30, respectively. In this falling movement, the laundry, not shown, comes into contact with a considerable proportion of the process air, which flows from the actively air-carrying, repositioned inflow region 42 into the laundry drum 3.

Figur 4 zeigt den Betrieb des Wäschetrockners 1 mit gegenüber der in Figur 3 dargestellten Situation entgegengesetzter Drehrichtung 60 des Trommelmantels 4 (sogenannter Reversierbetrieb 61). In dieser Betriebssituation ist das Steuerelement 31 von der Steuereinrichtung 33 gegenüber Figur 3 entgegen dem Uhrzeigersinn in den rechten Bereich 58 der Trommelrückwand 30 in die "5-Uhr-Position" P5 verschwenkt. Dadurch ist nun ein großer Anteil der Perforationen 36 zum Durchtritt der Prozessluft freigegeben, während entsprechend der Anteil der Perforationen 37 zum Durchtritt der Prozessluft vermindert ist. Demgemäß sind die aktiv luftführenden Einströmbereiche 41, 42 gegenüber der Situation in Figur 3 deutlich vergrößert bzw. vermindert und in ihrer resultierenden wirksamen Position (Flächenschwerpunkt) in die Positionen 62 und 63 gebracht. Im Betriebszustand nach Figur 4 fällt die durch die Mitnehmer 11 zunächst angehobene, nicht dargestellte Wäsche schwerkraftbedingt im Wesentlichen vor der linken Hälfte 65 der Trommelrückwand 30 bzw. im linken Volumenteil der Wäschetrommel 3 nach unten und durchschwebt damit einen Bereich des Behandlungsraums 10 (Figur 1), der von einem großen Anteil der Prozessluft 15 durch den aktiv luftführenden Einströmbereich 41 mit Prozessluft beaufschlagt ist. Damit ergibt sich also je nach Drehrichtung 50, 60 des Trommelmantels eine unterschiedliche Position der örtlich veränderbaren aktiv luftführenden Einströmbereiche 41,42. FIG. 4 shows the operation of the clothes dryer 1 with respect to in FIG. 3 illustrated situation opposite direction of rotation 60 of the drum shell 4 (so-called Reversierbetrieb 61). In this operating situation, the control element 31 is opposed by the control device 33 FIG. 3 pivoted counterclockwise in the right portion 58 of the drum rear wall 30 in the "5 o'clock position" P5. As a result, a large proportion of the perforations 36 is now released for the passage of the process air, while correspondingly the proportion of the perforations 37 for the passage of the process air is reduced. Accordingly, the actively air-guiding inflow regions 41, 42 are opposite to the situation in FIG FIG. 3 significantly increased or decreased and brought in their resulting effective position (centroid) in the positions 62 and 63. In operation after FIG. 4 falls due to the driver 11 initially raised, not shown scrubbing gravity mainly in front of the left half 65 of the drum rear wall 30 and in the left volume part of the laundry drum 3 down and floats through an area of the treatment room 10 (FIG. FIG. 1 ), which is acted upon by a large proportion of the process air 15 through the active air-guiding inflow 41 with process air. Thus, depending on the direction of rotation 50, 60 of the drum shell, a different position of the locally variable active air-conducting inflow regions 41, 42 results.

Die Figuren 5 und 6 zeigen in im Wesentlichen der Situation in den Figuren 3 und 4 entsprechenden Betriebssituationen die Freigabe (luftführend) bzw. den vollständigen Verschluss (nicht luftführend) der vorbeschriebenen Perforationen 36, 37 und damit die örtliche Veränderbarkeit der Einströmbereiche 41, 42. Im Gegensatz zu den Ausführungsbeispielen nach den Figuren 3 und 4 ist nach Figur 5 bei Drehrichtung 50 des Trommelmantels 4 im Uhrzeigersinn der Einströmbereich 42 zum ausschließlich luftführenden Einströmbereich verändert, während alle übrigen zuvor beschriebenen potentiellen Einströmmöglichkeiten (Perforationen 35, 36) durch die Steuereinrichtung 33 und entsprechende nur angedeutete Steuerelemente, nämlich die Blende 31 und die Blende 32 zur vollständigen Abdeckung der Perforationen 35, vollständig verschlossen sind.The FIGS. 5 and 6 show in essence the situation in the FIGS. 3 and 4 corresponding operating situations, the release (air-carrying) or the complete closure (not air-conducting) of the above-described perforations 36, 37 and thus the local variability of the inflow 41, 42. In contrast to the embodiments of the FIGS. 3 and 4 is after FIG. 5 in the direction of rotation 50 of the drum shell 4 in the clockwise direction, the inflow region 42 changes to the exclusively air-guiding inflow region, while all other potential inflow possibilities described above (Perforations 35, 36) by the control device 33 and corresponding only indicated controls, namely the aperture 31 and the aperture 32 for complete coverage of the perforations 35, are completely closed.

Figur 6 zeigt bei Drehrichtung 60 entgegen dem Uhrzeigersinn die Situation dergestalt, dass der aktiv luftführende Einströmbereich allein in den Einströmbereich 41 gelegt bzw. positioniert ist, während die übrigen Perforationen 35, 37 (Figuren 3 und 4) vollständig verschlossen sind. Damit ist in dieser Situation nur ein einziger aktiv luftführender Einströmbereich gebildet. FIG. 6 shows in the counterclockwise direction of rotation 60 the situation such that the active air-guiding inflow area is placed or positioned alone in the inflow area 41, while the remaining perforations 35, 37 (FIG. FIGS. 3 and 4 ) are completely closed. Thus, in this situation, only a single active air-guiding inflow area is formed.

Diese Vorgänge sind im Ablauf zur Erläuterung des erfindungsgemäßen Verfahrens in Figur 7 schematisch dargestellt. Aus einer permanenten oder sporadischen Überwachung 100 der Drehrichtung 45 der Wäschetrommel wird in einem Auswertungsschritt 110 festgestellt, ob der Trommelmantel 4 um seine Längsachse 5 im Uhrzeigersinn in Drehrichtung 50 oder entgegen dem Uhrzeigersinn in Drehrichtung 60 betrieben wird. Davon abhängig stellt die Steuereinrichtung 33 z.B. die Blenden 31, 32 bei Drehrichtung 50 so, dass die Perforationen 36 geschlossen und die Perforationen 37 geöffnet sind. Entsprechend stellt die Steuereinrichtung 33 in dem Fall des Betriebs entgegen dem Uhrzeigersinn in Drehrichtung 60 sicher, dass die Perforationen 37 geschlossen und die Perforationen 36 geöffnet sind (vergleiche Figuren 5 und 6). Als mögliche Antriebe für die Blenden 31, 32 können elektrische Motoren, Stellmotoren oder Aktoren (z.B. sog. Thermoaktoren) verwendet werden, um bewegbare Scheiben, Elemente mit einem oder mehreren Luftdurchlässen, Lamellen oder verschiebbare Blenden zu bewegen.These processes are in the sequence for explaining the method according to the invention in FIG. 7 shown schematically. From a permanent or sporadic monitoring 100 of the direction of rotation 45 of the laundry drum is determined in an evaluation step 110, whether the drum shell 4 is operated about its longitudinal axis 5 in the clockwise direction in the direction of rotation 50 or counterclockwise in the direction of rotation 60. Depending on the control device 33, for example, the aperture 31, 32 in the direction of rotation 50 so that the perforations 36 are closed and the perforations 37 are opened. Accordingly, in the case of counterclockwise operation in the direction of rotation 60, the controller 33 ensures that the perforations 37 are closed and the perforations 36 are open (see FIG FIGS. 5 and 6 ). As possible drives for the diaphragms 31, 32, electric motors, servomotors or actuators (eg so-called thermal actuators) can be used to move movable disks, elements with one or more air passages, fins or displaceable diaphragms.

Mit der Erfindung ist eine weiter optimierte Ausnutzung des Prozessluftvolumenstroms auch beim Reversierbetrieb möglich. Daraus resultieren vorteilhafterweise verkürzte Trocknungszeiten in Programmen, die mit reversierter Trommeldrehrichtung arbeiten, ein verminderter Energieverbrauch und eine sehr gleichmäßige Trocknung, was insgesamt zu einer erhöhten Energie- und Zeiteffizienz führt. Dabei können die Blenden zusätzlich auch so eingestellt und geregelt werden, dass in Ausgleich sich ändernder Betriebsparameter (beispielsweise Feuchtegrad der Wäsche) stets ein annähernd konstanter Prozessluftvolumenstrom sichergestellt ist.With the invention, a further optimized utilization of the process air volume flow is also possible during reversing operation. This results in advantageously shorter drying times in programs that operate with reversed drum rotation direction, a reduced energy consumption and a very uniform drying, which leads to an overall increase in energy and time efficiency. In addition, the diaphragms can additionally be set and regulated in such a way that an approximately constant process air volume flow is always ensured in compensation for changing operating parameters (for example the degree of moisture of the laundry).

Bezugszeichenreference numeral

11
Wäschetrocknerclothes dryer
22
Gehäusecasing
33
Wäschetrommelwashing drum
44
Trommelmanteldrum shell
55
Achseaxis
66
Vorderseitefront
77
Rückseiteback
88th
Beschicku ngsöffnungFeed opening
99
Beschickungstürloading door
1010
Behandlungsraumtreatment room
1111
Mitnehmertakeaway
1212
Ringdichtungring seal
1414
Luftführungair duct
1515
Prozessluftprocess air
1616
Gebläsefan
1818
Antriebsmotordrive motor
2020
Riemenscheibepulley
2222
Riemenbelt
2727
Ringdichtungring seal
3030
TrommelrückwandDrum rear wall
31, 3231, 32
Steuerelementecontrols
3333
Steuereinheitcontrol unit
35, 36, 3735, 36, 37
Perforationenperforations
40, 41, 4240, 41, 42
EinströmbereicheEinströmbereiche
4545
Drehrichtungdirection of rotation
5050
Drehrichtungdirection of rotation
51, 52, 5351, 52, 53
Positionenpositions
5858
rechte Hälfteright half
6060
Drehrichtungdirection of rotation
6161
Reversierbetriebreversing
62, 6362, 63
Positionenpositions
6565
linke Hälfteleft half
100100
Überwachungmonitoring
110110
Auswertungsschrittevaluation step
P5P5
"5-Uhr-Position""5 o'clock"
P6P6
"6-Uhr-Position""6 o'clock position"
P7P7
"7-Uhr-Position""7 o'clock"
P11P11
"11-Uhr-Position""11 o'clock position"
P12P12
"12-Uhr-Position""12 o'clock position"

Claims (7)

Anordnung zum Einleiten von Prozessluft (15) in eine Wäschetrommel (3) eines Wäschetrockners (1), - wobei die Wäschetrommel (3) einen um eine Längsachse (5) drehbaren Trommelmantel (4) und eine feststehende Trommelrückwand (30) umfasst, - wobei die Trommelrückwand (30) wenigstens einen Einströmbereich (40, 41, 42) aufweist, durch den Prozessluft (15) in die Wäschetrommel (3) einströmt, - wobei die örtliche Position (51, 52, 53) des luftführenden Einströmbereichs (41, 42) mittels einer Steuereinrichtung (33) veränderbar ist, gekennzeichnet durch - eine alternierende Umkehr der Drehrichtung (50, 60) des Trommelmantels (4), - wobei die Steuereinrichtung (33) die Position (51, 52, 53) des luftführenden Einströmbereichs (40, 41, 42) in Abhängigkeit von der alternierenden Umkehr der Drehrichtung (50, 60) des Trommelmantels (4) ändert. Arrangement for introducing process air (15) into a laundry drum (3) of a tumble dryer (1), - wherein the laundry drum (3) comprises a drum shell (4) rotatable about a longitudinal axis (5) and a fixed drum rear wall (30), - wherein the drum rear wall (30) has at least one inflow region (40, 41, 42) through which process air (15) flows into the laundry drum (3), - wherein the local position (51, 52, 53) of the air-guiding inflow region (41, 42) is variable by means of a control device (33), marked by - an alternating reversal of the direction of rotation (50, 60) of the drum shell (4), - wherein the control device (33) the position (51, 52, 53) of the air-guiding inflow region (40, 41, 42) in response to the alternating reversal of the direction of rotation (50, 60) of the drum shell (4) changes. Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
dass die Position (51, 52, 53) des Einströmbereichs des Einströmbereichs (41, 42) jeweils so gewählt ist, dass er sich zumindest überwiegend in dem Teil der Trommelrückwand (30) befindet, vor dem die Wäsche schwerkraftbedingt herabfällt.Arrangement according to claim 1,
characterized,
that the position (51, 52, 53) of the inflow region of the inflow region (41, 42) is selected in each case so that it is at least primarily in the part of the drum rear wall (30) is located in front of the force of gravity, the laundry falls down. Anordnung nach einem der Ansprüche 1 und 2,
dadurch gekennzeichnet,
dass sich die Position (51, 52, 53) des Einströmbereichs (41 42) überwiegend unterhalb der Längsachse (5) des Trommelmantels (4) befindet.Arrangement according to one of claims 1 and 2,
characterized,
that the position (51, 52, 53) of the inflow region (41 42) is located predominantly below the longitudinal axis (5) of the drum shell (4). Anordnung nach wenigstens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass sich oberhalb der Längsachse (5) des Trommelmantels (4) zumindest ein weiterer Einströmbereich (42) befindet.Arrangement according to at least one of the preceding claims,
characterized,
that at least one further inflow region (42) is located above the longitudinal axis (5) of the drum shell (4). Anordnung nach wenigstens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
dass der aktiv luftführende Gesamtquerschnitt des Einströmbereichs (40, 41, 42) veränderbar ist.Arrangement according to at least one of the preceding claims,
characterized,
that the active air-carrying overall cross-section of the inflow region (40, 41, 42) is variable. Anordnung nach Anspruch 5,
gekennzeichnet durch
eine Regelung des Gesamtquerschnitts derart, dass der Volumenstrom der durch die Wäschetrommel (3) strömenden Prozessluft (15) annähernd konstant bleibt.Arrangement according to claim 5,
marked by
a regulation of the overall cross-section such that the volume flow of the process air (15) flowing through the laundry drum (3) remains approximately constant. Verfahren zum Einleiten von Prozessluft (15) in eine Wäschetrommel (3) eines Wäschetrockners (1), dessen Wäschetrommel (3) einen um eine Längsachse (5) drehbaren Trommelmantel (4) und eine feststehende Trommelrückwand (30) umfasst, - wobei die Position mindestens eines Einströmungsbereichs (40, 41, 42) in der Trommelrückwand (30), durch den Prozessluft (15) in die Wäschetrommel (3) strömt, veränderbar ist, dadurch gekennzeichnet, - dass die Wäschetrommel (3) durch alternierende Umkehr der Drehrichtung (45) des Trommelmantels (4) im Reversierbetrieb (60) betrieben wird und - dass die Position des Einströmbereichs (41, 42) in Abhängigkeit von der alternierenden Umkehr der Drehrichtung (50, 60) des Trommelmantels (4) angepasst wird. Method for introducing process air (15) into a laundry drum (3) of a tumble dryer (1), the laundry drum (3) of which comprises a drum shell (4) rotatable about a longitudinal axis (5) and a fixed drum rear wall (30), wherein the position of at least one inflow region (40, 41, 42) in the drum rear wall (30), through which process air (15) flows into the laundry drum (3), is variable, characterized, - That the laundry drum (3) by alternating reversal of the direction of rotation (45) of the drum shell (4) in reversing mode (60) is operated and - That the position of the inflow region (41, 42) in response to the alternating reversal of the direction of rotation (50, 60) of the drum shell (4) is adjusted.
EP16183133.4A 2015-09-07 2016-08-05 Assembly and method for feeding process air into a drum of a laundry drier Active EP3138951B1 (en)

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DE102015217064.0A DE102015217064A1 (en) 2015-09-07 2015-09-07 Arrangement and method for introducing process air into a laundry drum of a tumble dryer

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TR201712729A2 (en) * 2017-08-25 2019-03-21 Arcelik As A WASHING MACHINE WITH IMPROVED DRYING PERFORMANCE
DE102019202071A1 (en) * 2019-02-15 2020-08-20 BSH Hausgeräte GmbH Laundry care device with one control
CN117265851A (en) * 2022-06-22 2023-12-22 湖北美的洗衣机有限公司 Drying control method, drying control device, clothes treatment equipment and storage medium

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Publication number Priority date Publication date Assignee Title
US3309783A (en) 1964-03-09 1967-03-21 Gen Electric Clothes drying machine having reversing drum drive means
DE4032079A1 (en) 1990-10-10 1992-04-16 Licentia Gmbh Efficiently drying washing using program-controlled drum dryer - with heating phase, with constant speed, phase with declining speed
EP2157230A1 (en) 2008-08-22 2010-02-24 BSH Bosch und Siemens Hausgeräte GmbH A set having a first dryer and a second dryer
US20120011738A1 (en) 2010-07-16 2012-01-19 Whirlpool Corporation Variable airflow in laundry dryer having variable air inlet
EP2423375A1 (en) 2010-08-24 2012-02-29 Electrolux Home Products Corporation N.V. Rotary-drum laundry dryer
EP2604746A1 (en) * 2011-12-15 2013-06-19 Indesit Company S.p.A. Laundry-drying machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3920303B1 (en) * 2005-11-21 2007-05-30 松下電器産業株式会社 Washing and drying machine
JP5793652B2 (en) * 2011-09-02 2015-10-14 パナソニックＩｐマネジメント株式会社 Clothes dryer and washing dryer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3309783A (en) 1964-03-09 1967-03-21 Gen Electric Clothes drying machine having reversing drum drive means
DE4032079A1 (en) 1990-10-10 1992-04-16 Licentia Gmbh Efficiently drying washing using program-controlled drum dryer - with heating phase, with constant speed, phase with declining speed
EP2157230A1 (en) 2008-08-22 2010-02-24 BSH Bosch und Siemens Hausgeräte GmbH A set having a first dryer and a second dryer
US20120011738A1 (en) 2010-07-16 2012-01-19 Whirlpool Corporation Variable airflow in laundry dryer having variable air inlet
EP2423375A1 (en) 2010-08-24 2012-02-29 Electrolux Home Products Corporation N.V. Rotary-drum laundry dryer
EP2604746A1 (en) * 2011-12-15 2013-06-19 Indesit Company S.p.A. Laundry-drying machine

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CN106498677A (en) 2017-03-15
CN106498677B (en) 2020-08-25
DE102015217064A1 (en) 2017-03-09
PL3138951T3 (en) 2019-09-30

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