EP3693506B1 - Wäschetrockner und flusenfalle - Google Patents

Wäschetrockner und flusenfalle Download PDF

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Publication number
EP3693506B1
EP3693506B1 EP20154493.9A EP20154493A EP3693506B1 EP 3693506 B1 EP3693506 B1 EP 3693506B1 EP 20154493 A EP20154493 A EP 20154493A EP 3693506 B1 EP3693506 B1 EP 3693506B1
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EP
European Patent Office
Prior art keywords
filter wall
filter
spools
fluff
scraping member
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EP20154493.9A
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English (en)
French (fr)
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EP3693506A1 (de
Inventor
Fabio Roncati
Paolo MANTICA
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Candy SpA
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Candy SpA
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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
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/22—Lint collecting arrangements

Definitions

  • the present invention relates to a laundry dryer or combo washer dryer which provides for drying laundry by means of a drying air flow, in which the moist drying air from the laundry compartment passes through a fluff trap before entering into a heat exchanger for the moisture extraction by means of condensation.
  • the warm and dry drying air is conveyed into the laundry compartment, in particular a basket or drum, where, by passing through the wet laundry, it causes the evaporation of the water contained in the fabrics.
  • the drying air loaded with moisture passes through a heat exchanger where it is cooled down, in order to extract the moisture therefrom by means of condensation.
  • the dehumidified drying air is then sucked in again by the ventilator, heated and routed into the laundry compartment.
  • a fluff trap is arranged to protect the heat exchanger from pollution and sedimentation of substances extracted from the laundry together with the moisture, for example hair, fabric fibers, detergent residues, which would otherwise reduce the heat exchange efficiency and therefore the performance of the dryer.
  • the fluff trap is arranged upstream of the cooling heat exchanger (embodied by the heat pump evaporator) to protect both the latter and a subsequent heating heat exchanger (embodied by the condenser of the heat pump) from pollution and sedimentation of substances extracted from the laundry together with the moisture, for example hair, fabric fibers, detergent residues, which would otherwise reduce the heat exchange efficiency and therefore the performance of the dryer.
  • the cooling heat exchanger embodied by the heat pump evaporator
  • a subsequent heating heat exchanger embodied by the condenser of the heat pump
  • the additional fluff traps must be regularly extracted from the laundry dryer and cleaned by the user (usually after each drying cycle).
  • the positioning of the fluff traps in the lower part of the laundry dryer and the need to first open the base and extract and re-insert the fluff trap in a leaning posture create discomfort for the user.
  • the filtering systems of the background art and in particular the cleaning methods thereof are not yet satisfactory and it is desirable to have self-cleaning or partially self-cleaning fluff traps for laundry dryers, having features such as to obviate the need for frequent extractions, cleaning and re-insertions of the fluff trap into the household appliance.
  • the laundry dryer comprises an electronic control system, which can be programmed by the user to select or set respectively one of a plurality of drying cycles, and is configured to automatically activate the filter cleaning system, for example, according to the execution of the drying cycles.
  • a laundry dryer 1 comprises a housing 2 which houses a laundry compartment 3, in particular a drum or basket rotatable by means of a motor 4, an air circuit 5 for the drying air 6 which includes the laundry compartment 3, a heat exchanger 7 for extracting moisture from the drying air 6, as well as a fluff trap 8 positioned in the air circuit 5 downstream of the laundry compartment 3 and upstream of the heat exchanger 7.
  • the fluff trap 8 comprises a filter support structure 10, a sieve-filter wall 9 supported by the filter support structure 10 and a filter cleaning system 11 configured to brush and/or scrape the filter wall 9 (with the fluff trap 8 mounted in the laundry dryer 1).
  • the filter cleaning system 11 comprises:
  • the filter support structure 10 can comprise a filter housing, for example a frame or a grille made of plastic or metal material.
  • the filter housing may form an inlet opening 17 for the inlet of the air flow 6 coming from the laundry compartment 3, as well as one or more outlet openings 18 for the outlet of the air 6 after the filtering.
  • the filter support structure 10 or the filter housing supports the filter wall 9, for example at the inside thereof, so that an inlet surface 19 of the filter wall 9 faces against the direction of the flow of drying air 6 or, in other words, towards the inlet opening 17, and an opposite outlet surface 20 of the filter wall 9 faces in the direction of the flow of air 6 or, in other words, towards the outlet opening 18.
  • the fluff transported by the air flow 6 is deposited on the inlet surface 19 of the filter wall 9.
  • the filter wall 9 may consist of a mesh or a fabric made of a synthetic polymeric material, possibly reinforced with glass or carbon fibers or, alternatively, of a metal material, or of a perforated sheet of a synthetic or metal material.
  • the fluff trap 8 is preferably positioned in a front area of the laundry dryer 1, below the laundry compartment 3.
  • the movement device 16 comprises one or more, preferably two but possibly three or more, spools 21 or drums, at least one, more or all of which can be actuated in rotation, for example, by means of one or more electric motors 22.
  • the filter wall 9 is supported by said spools 21, for example wound about, or supported by and/or returned on, one or more of said spools 21, so that the rotary actuation of the one or more spools 21 moves the filter wall 9 in scraping or brushing contact against the scraping member 15.
  • the movement device 16 comprises two spools 21 spaced apart from each other, which can be actuated in rotation by means of a single electric motor 22.
  • the filter wall 9 is supported by said spools 21, so that:
  • the first spool 21' is arranged higher than, preferably vertically above, the second spool 21', so as to keep the filter wall 9 pull-tensioned in a vertical or at least approximately erected filtering plane 25 between said first 21' and second 21" spools.
  • the electric motor 22 can be coupled to a synchronization or differential transmission 26 which transmits the motion, in a planned manner, to the spools 21, 21', 21'.
  • the filter wall 9 is supported and pull-tensioned by the one or more spools 21, 21', 21" so as to be extending along an extension path 27 between end paths 28, in which, during the movement of the filter wall 9 in scraping contact against the scraping member 15, the extension path 27 remains substantially unchanged and at least one or more of the end paths 28 undergo a variation of the winding length.
  • extension path 27 saves space and allows an easier washing of the filter wall by means of the spray nozzles 12.
  • the scraping member 15 comprises one or more scrapers or brushes:
  • the fluff trap 8 forms a reaction surface 30 arranged at the scraping member 15, but on the side of the filter wall 9 opposite with respect to the side (inlet surface 19) on which the scraping member 15 acts, so as to form an abutment for the thrust of the scraping member against the filter wall 9 and avoid undesirable deformations of the latter.
  • the reaction surface 30 is formed by one of the spools 21 or by a portion of a filter wall wound on one of the spools 21.
  • reaction surface 30 is formed at a distance from the spool or spools 21.
  • the scraping member 15 is kept in contact against the filter wall 9 at one of the spools 21, preferably at the aforesaid second (lower) spool 21".
  • the scraping member 15 is positioned below (preferably vertically below) the aforesaid second (lower) spool 21" and in contact from below against the filter wall 9.
  • the scraping member 15 comprises a linear brush extending in a direction transverse with respect to the movement direction of the filter wall 9 and/or extending parallel to the rotation axis of the spool 21 with which it is associated.
  • the scraping member 15 can be moved in a direction transverse with respect to the movement direction of the filter wall 9 and/or parallel to the rotation axis of the spool 21 with which it is associated. Thereby a bi-directional brushing effect is obtained.
  • the scraping member 15 can be moved in rotation and in contact with (the inlet surface 19 of) the filter wall 9, in particular, in rotation in the same direction of rotation of the spool 21 to which it is associated. Thereby the relative brushing speed between the scraping element 15 and the filter wall 9 increases.
  • the spray nozzles 12 are connected to a water supply system 31 which supplies mains water and/or washing water from a suitable water tank 32 and/or water condensed from the drying air flow 6.
  • the spray nozzles 12 are positioned in an upper part of the fluff trap 8 and spray from the top downwards against (the inlet surface 19 of) the filter wall 9.
  • the spray nozzles 12 direct pressurized water jets onto the (inlet surface 19 of) the filter wall 9, preferably at an impact angle 39 lower than 60°, preferably lower than 45° with respect to the plane of the filter wall 9 at the point of impact of the water jet.
  • the area in which the pressurized water jets impact on the filter wall 9 is arranged in an area in which the filter wall is free from supports, preferably in an area between two spools 21, 21', 21".
  • the spray nozzles 12 direct the water jets substantially in the movement direction of the filter wall 9 and/or downwards. This facilitates the collection of water sprayed together with the fluff detached from the filter wall 9 in a lower area of the fluff trap 1.
  • the spray nozzles 12 can be stationary or can be actuated in movement, e.g., they can perform:
  • a nozzle movement device 40 can be provided, for example, a fluid-dynamic device actuated by the pressure of the water supplied to the spray nozzles 12, or an electric motor, or a transmission which couples and/or synchronizes the movement of the spray nozzles 12 with the movement of the filter wall 9.
  • the filter cleaning system 11 further comprises a fluff transport system 33 with a fluff collection container 34, arranged below the scraping member 15 and adapted to collect the water sprayed by the spray nozzles 12 and the fluff separated from the filter wall 9, as well as with a transport duct 35, possibly equipped with a transport pump 36, which connects the fluff collection container 34 to a collection tray 37 which can be extracted and emptied by the user.
  • a fluff transport system 33 with a fluff collection container 34, arranged below the scraping member 15 and adapted to collect the water sprayed by the spray nozzles 12 and the fluff separated from the filter wall 9, as well as with a transport duct 35, possibly equipped with a transport pump 36, which connects the fluff collection container 34 to a collection tray 37 which can be extracted and emptied by the user.
  • the laundry dryer 1 comprises an electronic control system 38, which can be programmed by the user to select or set one of a plurality of drying cycles, respectively, and configured to automatically activate the filter cleaning system 11, for example, according to the execution of the drying cycles, for example, after each drying cycle or after a predetermined number of hours of operation of the laundry dryer 1.
  • the filter wall 9 remains stationary in a position, facing the flow of drying air 6, so as to trap the fluff on the surface 19 facing the air flow.
  • the fluff removal cycle 14 which will be defined within the drying cycle in terms of frequency and duration, consists of a first washing action of the filter wall 9 with the use of water applied by means of the spray nozzles 12 from the top downwards.
  • a step is added of mechanical removal of the fluff 14 from the filter wall 9, by means of the scraping member 15 (preferably a stationary brush) positioned at a lower area of the filter wall 9 and which collects the fluff 14 remaining on the filter wall 9 which, sliding downwards, conveys such fluff 14 against the scraping member 15.
  • the scraping member 15 preferably a stationary brush
  • the fluff that is detached and collected at the scraping member 15 is deposited in the collection container 34 in the lower part of the filtering device 8 and evacuated by means of and together with the water dispensed by the spray nozzles 12.
  • the invention described so far can be advantageously implemented in laundry dryers with a closed air circuit, with an electrical resistor or with a heat pump.
  • the drying air 6 is conveyed by means of a ventilator 41 (activated by a motor 42), is heated by means of an electrical resistor 43 and is routed into the laundry compartment 3, in particular a rotatable basket or drum, where, by passing through the wet laundry, causes the evaporation of the water contained in the fabrics.
  • a ventilator 41 activated by a motor 42
  • an electrical resistor 43 is routed into the laundry compartment 3, in particular a rotatable basket or drum, where, by passing through the wet laundry, causes the evaporation of the water contained in the fabrics.
  • the drying air 6 loaded with moisture passes through the heat exchanger 7, where it is cooled down, for example by means of a flow of cold water or of fresh air 44 conveyed by means of a second ventilator (preferably, but not necessarily, activated by means of the same electric motor 42), in order to extract the moisture therefrom by means of condensation.
  • a second ventilator preferably, but not necessarily, activated by means of the same electric motor 42
  • the condensation is collected in a condensation container which can be extracted, or drained by means of a drain pump and/or together with the cooling water.
  • the dehumidified drying air 6 is then sucked in again by the ventilator 41, heated by means of the electrical resistor 43 and rerouted into the laundry compartment 3.
  • the fluff trap 8 Upstream of the heat exchanger 7 (where the moisture extraction occurs) the fluff trap 8, with the cleaning system 11 described above, is arranged.
  • the drying air 6 loaded with moisture passes through a first (cold) heat exchanger 45 embodied by an evaporator 46 of the heat pump, where the air 6 is cooled down in order to extract the moisture therefrom by means of condensation.
  • the condensation may be collected in a condensation container which can be extracted, or may be drained, e.g., by means of a drain pump.
  • the dehumidified and cooled drying air 6 is then routed into a second (hot) heat exchanger consisting of a condenser 47 of the heat pump, where the air is heated up.
  • the dehumidified and heated air is sucked in by means of a ventilator 41, and routed again into the laundry compartment 3 in order to continue the extraction of the moisture from the laundry.
  • the heat pump further comprises a compressor 48 which sucks in a refrigerant fluid through the evaporator 46, where the fluid itself evaporates at low pressure (absorbing the heat of the drying air 6), compresses the refrigerant fluid and pushes it inside the condenser 47 where the compressed and heated refrigerant fluid condenses and cools down at high pressure (releasing its heat to the drying air 6).
  • the refrigerant fluid passes through a thermal expansion valve 49 which reduces the fluid pressure, with a consequent lowering of the temperature and, subsequently, enters again in the evaporator 46, restarting the cycle.
  • the fluff trap 8, or only the filter wall 9 may be assembled in the housing 2 in a manner extractable from the laundry dryer 1.
  • control system 38 is in signal connection with and controls the electrical supply of the individual functional groups of the laundry dryer 1, as diagrammatically shown in Figures 1 and 2 .
  • the control system 35 may further comprise an optical indicator, e.g., a LED, display, etc. or an acoustic indicator to signal to the user the need to extract the fluff collected in the collection tray 37.
  • an optical indicator e.g., a LED, display, etc. or an acoustic indicator to signal to the user the need to extract the fluff collected in the collection tray 37.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Claims (14)

  1. Flusenfänger (8) für einen Wäschetrockner (1), wobei der Flusenfänger (8) eine Filterhalterungsstruktur (10), eine Siebfilterwand (9), welche durch die Filterhalterungsstruktur (10) gehaltert ist, und ein Filterreinigungssystem (11) umfasst,
    wobei das Filterreinigungssystem (11) umfasst:
    - eine oder mehrere Sprühdüsen (12), welche durch die Filterhalterungsstruktur (10) gehaltert sind und dazu eingerichtet sind, einen oder mehrere druckbeaufschlagte Wasserstrahlen (13) auf die Filterwand (9) zu sprühen, um Flusen (14) einzuweichen und von der Filterwand (9) zu lösen,
    dadurch gekennzeichnet, dass das Filterreinigungssystem (11) ferner umfasst:
    - ein Abstreifelement (15), welches durch die Filterhalterungsstruktur (10) in einer Abstreifposition gegen die Filterwand (9) gehaltert ist,
    - eine Filterbewegungsvorrichtung (16), welche dazu eingerichtet ist, die Filterwand (9) in Bezug auf die Filterhalterungsstruktur (10) und in Bezug auf das Abstreifelement (15) derart zu bewegen, dass das Abstreifelement (15) die eingeweichten Flusen (14) von der Filterwand (9) wegbürstet,
    - eine Düsenbewegungsvorrichtung (40), um die Sprühdüsen während der Wasserabgabe zu bewegen.
  2. Wäschetrockner (1), umfassend ein Gehäuse (2), welches aufnimmt:
    - eine Wäschekammer (3),
    - einen Luftkreislauf (5), welcher die Wäschekammer (3) und einen Wärmetauscher (7) zum Extrahieren von Feuchtigkeit aus der Trocknungsluft (6) umfasst,
    - einen Flusenfänger (8) nach Anspruch 1, welcher in dem Luftkreislauf (5) stromabwärts der Wäschekammer (3) und stromaufwärts des Wärmetauschers (7) positioniert ist.
  3. Wäschetrockner (1) nach Anspruch 2, wobei die Filterbewegungsvorrichtung (16) eine oder mehrere Rollen (21) umfasst, welche mittels eines oder mehrerer Elektromotoren (22) in Drehung versetzt werden können, und die Filterwand (9) derart durch die eine oder die mehreren Rollen (21) gehaltert ist, dass die Drehbetätigung der einen oder der mehreren Rollen (21) die Filterwand (9) in Bürstenkontakt gegen das Abstreifelement (15) bewegt.
  4. Wäschetrockner (1) nach Anspruch 3, wobei die Filterbewegungsvorrichtung .(16) zwei Rollen (21) umfasst, welche voneinander beabstandet sind, und die Filterwand (9) derart durch die beiden Rollen (21) gehaltert ist, dass:
    - die Drehbetätigung der beiden Rollen (21) in einer ersten Drehrichtung (23) die Filterwand (9) von einer ersten Rolle (21') der beiden Rollen (21', 21") abwickelt und die Filterwand (9) auf eine zweite Rolle (21") der beiden Rollen (21', 21") wickelt, wobei ein Abschnitt der Filterwand (9) sich zwischen der ersten Rolle (21') und der zweiten Rolle (21") erstreckend gehalten wird und die Filterwand (9) stets in Bürstenkontakt gegen das Abstreifelement (15) gehalten wird,
    - die Drehbetätigung der beiden Rollen (21) in einer zweiten Drehrichtung (24) die Filterwand (9) von der zweiten Rolle (21") der beiden Rollen (21', 21") abwickelt und die Filterwand (9) auf die erste Rolle (21') der beiden Rollen (21', 21") wickelt, wobei ein Abschnitt der Filterwand (9) sich zwischen der ersten Rolle (21') und der zweiten Rolle (21") erstreckend gehalten wird, wobei die erste Rolle (21') derart vertikal oberhalb der zweiten Rolle (21') angeordnet ist, dass die Filterwand (9) in einer vertikalen Filterebene (25) zwischen der ersten (21') und der zweiten (21") Rolle gespannt gehalten wird.
  5. Wäschetrockner (1) nach Anspruch 3 oder 4, wobei der Elektromotor (22) mit einem Synchronisations- oder Differentialgetriebe (26) gekoppelt ist, welches die Bewegung der Rollen (21, 21', 21') überträgt.
  6. Wäschetrockner (1) nach einem der Ansprüche 3 bis 5, wobei die Filterwand (9) durch die eine oder die mehreren Rollen (21, 21', 21") derart gehaltert und gespannt ist, dass sie sich entlang eines Erstreckungspfads (27) zwischen Bewegungsendpfaden (28) erstreckt, entlang welcher die Filterwand (9) um die Rollen (21, 21', 21") gewickelt ist, wobei während der Bewegung der Filterwand (9) in Kontakt gegen das Abstreifelement (15) der Erstreckungspfad (27) im Wesentlichen unverändert bleibt und wenigstens einer der Bewegungsendpfade (28) eine Variation der Wickellänge erfährt.
  7. Wäschetrockner (1) nach einem der vorhergehenden Ansprüche von 2 bis 6, wobei das Abstreifelement (15) einen oder mehrere Abstreifer oder eine oder mehrere Bürsten in Kontakt mit der Filterwand (9) umfasst und:
    A) der eine oder die mehreren Abstreifer oder die eine oder die mehreren Bürsten sind:
    - stationär oder
    - beweglich mittels eines eigenen Abstreiferaktuators (29) oder
    - beweglich mittels des gleichen Aktuators (22) der Filterbewegungsvorrichtung (16),
    B) der Flusenfänger (8) eine Reaktionsfläche (30) bildet, welche an dem Abstreifelement (15), jedoch an der Seite der Filterwand (9) entgegengesetzt in Bezug auf die Seite, an welcher das Abstreifelement (15) wirkt, derart angeordnet ist, dass sie eine Anlage für den Druck des Abstreifelements gegen die Filterwand (9) bildet.
  8. Wäschetrockner (1) nach Anspruch 7 und 3, wobei die Reaktionsfläche (30) durch eine der Rollen (21) oder durch einen Abschnitt der Filterwand (9) gebildet ist, welcher auf die Rolle (21) gewickelt ist.
  9. Wäschetrockner (1) nach Anspruch 4, wobei das Abstreifelement (15) an der zweiten unteren Rolle (21") in Kontakt gegen die Filterwand (9) gehalten wird.
  10. Wäschetrockner (1) nach Anspruch 9, wobei das Abstreifelement (15) unterhalb der zweiten Rolle (21") und in Kontakt von unterhalb gegen die Filterwand (9) positioniert ist.
  11. Wäschetrockner (1) nach einem der vorhergehenden Ansprüche, wenn abhängig von Anspruch 3, wobei das Abstreifelement (15) eine lineare Bürste umfasst, welche sich parallel zu der Drehachse der Rolle (21) erstreckt, welcher sie zugeordnet ist.
  12. Wäschetrockner (1) nach einem der vorhergehenden Ansprüche von 2 bis 11, wobei das Abstreifelement (15) beweglich ist:
    - in einer Richtung transversal in Bezug auf die Bewegungsrichtung der Filterwand (9) oder
    - in Drehung und in Kontakt mit der Filterwand (9).
  13. Wäschetrockner (1) nach einem der vorhergehenden Ansprüche von 2 bis 12, wobei:
    A) die Sprühdüsen (12) in einem oberen Teil des Flusenfängers (8) positioniert sind und von oben nach unten gegen die Filterwand (9) sprühen und/oder
    B) die Sprühdüsen (12) Wasserstrahlen in einem Auftreffwinkel (39) von weniger als 45° in Bezug auf die Ebene der Filterwand (9) auf den Auftreffpunkt des Wasserstahls richten,
    wobei der Bereich, in welchem die druckbeaufschlagten Wasserstrahlen auf die Filterwand (9) auftreffen, in einer Region angeordnet ist, in welcher die Filterwand (9) frei von Halterungen ist.
  14. Wäschetrockner (1) nach einem der vorhergehenden Ansprüche von 2 bis 13, wobei das Filterreinigungssystem (11) ein Flusentransportsystem (33) umfasst, mit:
    - einem Flusensammelbehälter (34), welcher unterhalb des Abstreifelements (15) angeordnet ist und dazu eingerichtet ist, das durch die Sprühdüsen (12) gesprühte Wasser und die von der Filterwand (9) separierten Flusen zu sammeln,
    - eine Transportleitung (35), welche den Flusensammelbehälter (34) mit einer Sammelschale (37) verbindet, welche durch den Benutzer extrahiert und geleert werden kann.
EP20154493.9A 2019-02-08 2020-01-30 Wäschetrockner und flusenfalle Active EP3693506B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000001819A IT201900001819A1 (it) 2019-02-08 2019-02-08 Macchina asciugabiancheria e filtro per lanugine

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EP3693506A1 EP3693506A1 (de) 2020-08-12
EP3693506B1 true EP3693506B1 (de) 2021-06-23

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7117465U (de) * 1971-04-30 1972-10-05 Siemens-Electrogeraete Gmbh Nach dem Trommelprinzip arbeitender Wäschetrockner
DE102005055179A1 (de) * 2005-11-18 2007-05-24 BSH Bosch und Siemens Hausgeräte GmbH Flusenfiltereinrichtung und Verfahren zum Reinigen einer Flusenfiltereinrichtung
EP2376702B1 (de) * 2008-12-17 2014-02-12 LG Electronics Inc. Trockner und vorrichtung zum entfernen von fremdmaterial davon
EP3090093B1 (de) * 2013-12-30 2018-12-19 Electrolux Appliances Aktiebolag Wäschebehandlungsvorrichtung mit flusensiebwaschanlage
KR101718040B1 (ko) * 2015-06-18 2017-03-20 엘지전자 주식회사 건조기능을 구비한 의류처리장치

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IT201900001819A1 (it) 2020-08-08

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