EP2042643B1 - Haushaltswäschetrockner mit Dampfgenerator - Google Patents

Haushaltswäschetrockner mit Dampfgenerator Download PDF

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Publication number
EP2042643B1
EP2042643B1 EP07117383.5A EP07117383A EP2042643B1 EP 2042643 B1 EP2042643 B1 EP 2042643B1 EP 07117383 A EP07117383 A EP 07117383A EP 2042643 B1 EP2042643 B1 EP 2042643B1
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EP
European Patent Office
Prior art keywords
air
drying drum
steam
drum
hot
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.)
Not-in-force
Application number
EP07117383.5A
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English (en)
French (fr)
Other versions
EP2042643A1 (de
Inventor
Ugo Favret
Flavio Noviello
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Home Products Corp NV
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Electrolux Home Products Corp NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP07117383.5A priority Critical patent/EP2042643B1/de
Priority to RU2008138471/12A priority patent/RU2463397C2/ru
Publication of EP2042643A1 publication Critical patent/EP2042643A1/de
Application granted granted Critical
Publication of EP2042643B1 publication Critical patent/EP2042643B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status 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
    • 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 
    • D06F58/203—Laundry conditioning arrangements
    • 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 
    • D06F58/24—Condensing arrangements

Definitions

  • the present invention relates to a home laundry drier with steam generator.
  • the present invention relates to a rotary-drum home laundry drier with steam generator.
  • rotary-drum laundry driers substantially comprise a substantially parallelepiped-shaped outer box casing; a cylindrical laundry drying drum housed in axially rotating manner inside the box casing, directly facing a laundry loading and unloading opening formed in the front face of the casing; a door hinged to the front face of the casing to rotate to and from a rest position closing the opening in the front face of the casing to seal the drying drum; and an electric motor for rotating the drying drum about its longitudinal axis inside the casing.
  • Rotary-drum laundry driers of the above type also comprise a closed-circuit, hot-air generator designed to circulate inside the drying drum a stream of hot air with a low moisture content, and which flows through the drying drum and over the laundry inside the drum to rapidly dry the laundry.
  • the closed-circuit, hot-air generator comprises an air/air heat exchanger and an electric heater located one after the other along an air recirculating conduit, the two ends of which are connected to the drying drum, on opposite sides of the latter; and an electric centrifugal fan or similar located along recirculating conduit to produce, inside the recirculating conduit, an airflow which flows through the drying drum.
  • the air/air heat exchanger provides for rapidly cooling the airflow from the drying drum to condense the surplus moisture in the airflow; and the heater provides for rapidly heating the airflow from the heat exchanger back to the drying drum, so that the air flowing into the drum is heated rapidly to a temperature higher than or equal to that of the same air flowing out of the drying drum.
  • Some more recently marketed rotary-drum driers also feature a pressurized-steam generator which, at the end of the drying cycle, feeds a jet of steam into the drying drum to eliminate or at least greatly reduce wrinkling of the fabrics produced during the drying cycle.
  • a nozzle located inside the casing, in the collar connecting the front opening of the drying drum to the laundry loading and unloading opening in the front face of the casing, and generally comprise a demineralized-water reservoir housed in the highest part of the household appliance casing for easy manual refill with distilled/demineralized water; and an electric steam generating boiler normally located below the demineralized-water reservoir and connected to it by a connecting pipe. Water flows by gravity into the electric boiler under control of an electrovalve or similar placed along the connecting pipe.
  • the electronic central control unit of the drier stops the electric centrifugal fan of the hot-air generator to discontinue the air circulation, and activates the pressurized-steam generator to feed a sequence of jets of steam into the drying drum while the electric motor repeatedly changes the rotating direction of the drying drum.
  • the stop of air circulation avoids the hot-air generator to immediately such the steam out of the drying drum, thus preventing the steam to reach the laundry.
  • the intake of the air recirculating conduit of the hot-air generator in fact, is integrated in the door, immediately beneath the steam nozzle.
  • EP 1 666 655 discloses a drying machine comprising a cylindrical drum provided with opened front and rear surfaces and supported by a front bracket and a rear bracket, which slidably support inner cylindrical surfaces of front and rear ends of the drum.
  • Air suction holes for sucking hot air therethrough are formed through the upper portion of the rear bracket.
  • An air suction duct for guiding the hot air to the air suction holes is installed in the rear of the rear bracket.
  • the air suction duct extends backwards from the lower part of the drum, and is bent upwards so as to be connected to the air suction holes.
  • a heater for heating the air sucked from the inside of the housing is installed at an inlet of the air suction duct.
  • a central portion of the front bracket is open so that an object to be dried can be put into the housing through a door.
  • Air discharge holes for discharging air containing moisture evaporated from the object are formed through the lower portion of the front bracket.
  • An air discharge duct for discharging the air, discharged from the air discharge holes, to the outside of the drying machine, an air blast fan, and a discharge pipe are installed below the drum.
  • the air discharge duct guides the air, discharged from the air discharge holes, to the lower portion of the housing.
  • the air discharge duct is connected to the air blast fan, which induces the flow of air in the drying machine.
  • the air, discharged through the air blast fan, is discharged to the outside of the drying machine by a discharge pipe.
  • a driving motor for simultaneously driving the air blast fan and the drum is installed in the lower portion of the housing.
  • the steam generating device installed above the drum, for supplying steam to the inside of the tub;
  • the steam generating device comprises a steam supply pipe provided with a spray nozzle installed close to an upper and frontal region of the drum, so that the steam produced in the steam generating device is admitted into the drum from a frontal and upper region of the latter.
  • a home laundry drier as claimed in Claim 1 and preferably, though not necessarily, in any one of the dependent Claims.
  • Number 1 in the attached drawing indicates as a whole a home laundry drier comprising a preferably, though not necessarily, parallelepiped-shaped outer box casing 2; a preferably, though not necessarily, cylindrical bell-shaped laundry drying drum 3 for housing the laundry to be dried, and which is fixed in axially rotating manner inside casing 2, directly facing a laundry loading and unloading opening 2a formed in the front face of casing 2; and a door 4 hinged to the front face of casing 2 to rotate to and from a rest position closing opening 2a in the front face to seal laundry drum 3.
  • drying drum 3 rests horizontally inside casing 2 on a number of horizontal supporting rollers 5 which are fitted to casing 2 to let drying drum 3 freely rotate about its longitudinal axis L.
  • laundry drier 1 also comprises a motor assembly 6 for rotating, on command, drying drum 3 about its longitudinal axis L inside casing 2; and a closed-circuit, hot-air generator 7 housed inside casing 2 and designed to circulate through drying drum 3 a stream of hot air having a low moisture level, and which flows over and rapidly dries the laundry inside drum 3.
  • closed-circuit, hot-air generator 7 provides for gradually drawing air from drying drum 3; extracting surplus moisture from the hot air drawn from drying drum 3; heating the dehumidified air to a predetermined temperature, normally higher than the temperature of the air from drying drum 3; and feeding the heated, dehumidified air back into drying drum 3, where it flows over, to rapidly dry, the laundry inside the drum.
  • hot-air generator 7 provides for continually dehumidifying and heating the air circulating inside drum 5 to rapidly dry the laundry inside the drum, and substantially comprises:
  • the intake end of recirculating conduit 8 is integrated in door 4, and is faced to the front opening of drying drum 3; the end wall 3a of drying drum 3 is perforated, or at any rate permeable to air, to permit air entry into drum 3; and the exhaust end of recirculating conduit 8 is coupled in airtight manner directly to the end wall 3a of drying drum 3.
  • centrifugal fan 9 it is mechanically coupled to motor assembly 6 so as to be driven together with drying drum 3, and is structured to produce an airflow f flowing, along recirculating conduit 8, from the intake end of recirculating conduit 8, i.e door 4, to the exhaust end of recirculating conduit 8, i.e. perforated end wall 3a of drying drum 3.
  • motor assembly 6 consists of an electric motor 12 fixed inside casing 2 below drying drum 3, of a pulley 13 fitted to the output shaft of electric motor 12, and of a drive belt 14 looped about drying drum 3 and pulley 13; and centrifugal fan 9 is directly coupled to electric motor 12 so that the impeller/rotor of centrifugal fan 9 is directly driven by the output shaft of electric motor 12.
  • electric motor 12 drives both drying drum 3 and centrifugal fan 9.
  • heat exchanger 10 is located at the bottom of casing 2, and it is also provided with a condensed-water canister 15 which collects the liquid distilled water produced, when the drier is running, inside heat exchanger 10 by condensation of the surplus moisture in the stream of hot air f arriving from drying tub 3. Obviously condensed-water canister 15 is located in the bottom of heat exchanger 10.
  • hot-air generator 7 is also provided with a water drain circuit 16 for draining the distilled water from canister 15.
  • water drain circuit 16 comprises a high-capacity manually-removable waste-water tank 17 housed in easily removable manner inside casing 2, preferably, though not necessarily, near the top of the casing; and an electric pump 18, which, on command, sucks the distilled water from condensed-water canister 15 and feeds it to waste-water tank 17 via a connecting pipe 19.
  • electric pump 18 is a submerged electric pump 18 located at the bottom of condensed-water canister 15 and it is switched on in known manner when the water level in canister 15 exceeds a given upper threshold value.
  • laundry drier 1 also comprises a pressurized-steam generator 20, which, on command, produces and feeds a jet of steam into drying drum 3 to eliminate or at least greatly reduce wrinkling of the fabrics produced during the drying cycle.
  • a pressurized-steam generator 20 which, on command, produces and feeds a jet of steam into drying drum 3 to eliminate or at least greatly reduce wrinkling of the fabrics produced during the drying cycle.
  • pressurized-steam generator 20 comprises an instant in-pressure electric boiler 21 designed to receive a given quantity of water and immediately convert it into a stream of low-pressure steam whose pressure is slightly higher than external pressure; a steam injection nozzle 22 faced to the perforated end wall 3a of drying drum 3, outside of the drum, and structured for projecting jets of low-pressure steam through end wall 3a, inside drying drum 3; and a steam exhaust manifold 23 connecting the outlet of electric boiler 21 to the steam injection nozzle 22 for feeding the low-pressure steam produced by electric boiler 21 directly to nozzle 22.
  • steam exhaust manifold 23 extends outside of recirculating conduit 8, whereas steam injection nozzle 22 is housed in the exhaust end of recirculating conduit 8.
  • steam injection nozzle 22 could be located outside of the exhaust end of recirculating conduit 8, but anyway facing the perforated end wall 3a of drying drum 3.
  • pressurized-steam generator 20 is provided with a demineralized-water reservoir 24 which is housed inside casing 2, over electric boiler 21, and is connected to electric boiler 21 by a connecting pipe 25; and with an electrovalve 26 or similar which is located along connecting pipe 25 to control the outflow of water from water reservoir 24 to electric boiler 21.
  • water flows by gravity from water reservoir 24 to electric boiler 21.
  • water reservoir 24 of pressurized-steam generator 20 is preferably, though not necessarily, connected to water drain circuit 16 of hot-air generator 7, to receive part of the distilled water drained from water canister 15.
  • water reservoir 24 is connected to water drain circuit 16 of hot-air generator 7, namely connecting pipe 19, via a manually-removable filter 27 structured to keep fluff and/or lint particles out of water reservoir 23.
  • laundry drier 1 also comprises an electronic central control unit 28, which controls electric motor 12, heat exchanger 10 (or, rather, the cooling fan 29 of heat exchanger 10, which generates cold airflow w through the exchanger), and heater 11 in predetermined manner, as memorized inside it, to perform the user-selected drying cycle.
  • control unit 28 also controls steam generator 20 (i.e. electric boiler 21 and electrovalve 26) in predetermined manner, as memorized inside it, to feed jets of low-pressure steam into drying drum 3 through its perforated end wall 3a when required by the user-selected drying cycle.
  • steam generator 20 i.e. electric boiler 21 and electrovalve 26
  • Positioning the steam injection nozzle 22 in front of the perforated end wall 3a of drying drum 3 has lots of advantages: first and foremost, the possibility to use a single electric motor - i.e. electric motor 12 - for driving both drying drum 3 and centrifugal fan 9, thus drastically reducing manufacturing costs.
  • laundry drier 1 in laundry drier 1 the steam jets are taken into the drying drum 3 by the stream of hot air f entering in drying drum 3 via the perforated end wall 3a, thus performing a "drift" steam de-wrinkling of the fabrics in drum 3.
  • the air circulation generated by hot-air generator 7 helps in performing an optimal steam de-wrinkling of the fabrics in drum 3, and should not be discontinue during rotation of drying drum 3 in both rotating direction.
  • centrifugal fan 9 is structured to produce a stream of hot air f flowing from the intake end of recirculating conduit 8 to the exhaust end of recirculating conduit 8 irrespective of the rotating direction of the impeller/rotor of the fan.
  • electric motor 12 of motor assembly 6 may be mechanically coupled also to cooling fan 29 of heat exchanger 10. In which case, therefore, electric motor 12 drives at the same time drying drum 3, centrifugal fan 9 and cooling fan 29.
  • steam exhaust manifold 23 may extend up to steam injection nozzle 22 inside the end portion of recirculating conduit 8.

Landscapes

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

Claims (10)

  1. Haushaltswäschetrockner (1), umfassend ein äußeres Kastengehäuse (2) und, im Gehäuse, eine Trockentrommel (3) für das Unterbringen der zu trocknenden Wäsche, einen Heißluftgenerator (7) für das Zirkulieren eines Heißluftstroms (f) in der Trockentrommel (3) und einen Dampfgenerator (20) für das Einbringen von Dampf in die Trockentrommel (3); wobei die Trockentrommel (3) im Gehäuse (2) für das Drehen um ihre Längsachse (L) fixiert ist und der Wäschetrockner (1) mit Antriebsmitteln (6) zum Drehen der Trockentrommel (3) um ihre Längsachse (L) auf Befehl versehen ist; wobei die Endwand (3a) der Trockentrommel (3) für Luft durchdringbar ist, um einen Lufteintritt in die Trommel (3) zu gestatten, und wobei der Heißluftgenerator (7) einen Luftumwälzkanal (8) umfasst, dessen Ablaufende an die Endwand (3a) der Trockentrommel (3) gekoppelt ist, und Belüftungsmittel (9) zum Erzeugen eines Luftstroms (f) entlang des Umwälzkanals (8), der über die Endwand (3a) in die Trockentrommel (3) eintritt; wobei die Antriebsmittel (6) einen Elektromotor (12) umfassen, der mechanisch an die Trockentrommel (3) gekoppelt ist, um die Letztgenannte auf Befehl um ihre Längsachse (L) zu drehen, wobei der Elektromotor (12) auch die Belüftungsmittel (9) antreibt, und der Dampfgenerator (20) über eine Dampfdüse (22) Dampf in die Trockentrommel (3) einbringt, dadurch gekennzeichnet, dass die Dampfdüse (22) der Endwand (3a) der Trockentrommel (3) derart zugewandt ist, dass Dampfstrahlen über den Heißluftstrom (f), der über die Endwand (3a) in die Trockentrommel (3) eintritt, in die Trockentrommel (3) überführt werden.
  2. Haushaltswäschetrockner nach Anspruch 1, dadurch gekennzeichnet, dass der Heißluftgenerator (7) auch einen Wärmetauscher (10) umfasst, der sich entlang des Umwälzkanals (8) befindet, um den Heißluftstrom (f) aus der Trockentrommel (3) zu kühlen und die überschüssige Feuchtigkeit im Heißluftstrom (f) zu kondensieren, und Heizmittel (11), die sich entlang des Umwälzkanals (8) befinden, um auf Befehl den aus dem Wärmetauscher (10) und zurück in die Trockentrommel (3) strömenden Heißluftstrom (f) zu erwärmen.
  3. Haushaltswäschetrockner nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Dampfgenerator (20) einen elektrischen Boiler (21) umfasst, der ausgelegt ist, Wasser aufzunehmen und es unmittelbar in einen Niederdruckdampfstrom umzuwandeln, und einen Dampfablaufverteiler (23), der den Auslass des elektrischen Boilers (21) mit der Dampfdüse (22) verbindet, um den vom elektrischen Boiler (21) erzeugten Niederdruckdampf direkt in die Dampfdüse (22) einzubringen.
  4. Haushaltswäschetrockner nach Anspruch 3, dadurch gekennzeichnet, dass der Dampfgenerator (20) auch einen Wasserbehälter (24) umfasst, der mit dem elektrischen Boiler (21) in Verbindung steht.
  5. Haushaltswäschetrockner nach einem der Ansprüche 2-4, dadurch gekennzeichnet, dass der Wärmetauscher (10) mit einem Wasserkanister (15) versehen ist, der das flüssige destillierte Wasser sammelt, das im Wärmetauscher (10) durch die Kondensation der überschüssigen Feuchtigkeit im Heißluftstrom (f) aus der Trockentrommel (3) erzeugt wird, und mit einem Wasserableitkreis (16) zum Ableiten des destillierten Wassers aus dem Wasserkanister (15).
  6. Haushaltswäschetrockner nach Anspruch 4 und 5, dadurch gekennzeichnet, dass der Wasserbehälter (24) mit dem Wasserableitkreis (16) des Heißluftgenerators (7) verbunden ist, um einen Teil des aus dem Wasserkanister (15) des Wärmetauschers (10) abgeleiteten destillierten Wassers aufzunehmen.
  7. Haushaltswäschetrockner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Dampfdüse (22) des Dampfgenerators (20) im Ablaufende des Luftumwälzkanals (8) des Heißluftgenerators (7) untergebracht ist.
  8. Haushaltswäschetrockner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Endwand (3a) der Trockentrommel (3) eine perforierte Wand ist.
  9. Haushaltswäschetrockner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Trockentrommel (3) eine im Wesentlichen zylindrische, glockenförmige Trommel ist.
  10. Haushaltswäschetrockner nach einem der Ansprüche 2-9, dadurch gekennzeichnet, dass der Wärmetauscher (10) ein Luft-Luft-Wärmetauscher ist, der sich entlang des Umwälzkanals (8) befindet, sodass ihn der Heißluftstrom (f) aus der Trockentrommel (3) und ein zweiter Kaltluftstrom (w) von außerhalb des Gehäuses (2) gleichzeitig durchströmen; wobei der Luft-Luft-Wärmetauscher (10) mit zweiten Belüftungsmitteln (29) versehen ist, die den Kaltluftstrom (w) erzeugen, und der Elektromotor (12) auch an die zweiten Belüftungsmittel (29) mechanisch gekoppelt ist, um sie anzutreiben.
EP07117383.5A 2007-09-27 2007-09-27 Haushaltswäschetrockner mit Dampfgenerator Not-in-force EP2042643B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07117383.5A EP2042643B1 (de) 2007-09-27 2007-09-27 Haushaltswäschetrockner mit Dampfgenerator
RU2008138471/12A RU2463397C2 (ru) 2007-09-27 2008-09-26 Бытовая сушилка для белья с генератором пара

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07117383.5A EP2042643B1 (de) 2007-09-27 2007-09-27 Haushaltswäschetrockner mit Dampfgenerator

Publications (2)

Publication Number Publication Date
EP2042643A1 EP2042643A1 (de) 2009-04-01
EP2042643B1 true EP2042643B1 (de) 2015-07-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07117383.5A Not-in-force EP2042643B1 (de) 2007-09-27 2007-09-27 Haushaltswäschetrockner mit Dampfgenerator

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RU (1) RU2463397C2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2163682B1 (de) * 2008-09-12 2013-01-09 Electrolux Home Products Corporation N.V. Haushaltswäschetrockner
RU2757401C1 (ru) * 2021-03-01 2021-10-15 Федеральное государственное бюджетное образовательное учреждение высшего образования "Белгородский государственный аграрный университет имени В.Я. Горина" Сушилка пророщенного зерна

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8122547B2 (en) * 2004-07-20 2012-02-28 Lg Electronics Inc. Washing machine and method for controlling the same
KR100672515B1 (ko) * 2004-11-30 2007-01-24 엘지전자 주식회사 세탁 장치의 운전 방법
KR20060061974A (ko) * 2004-12-02 2006-06-09 삼성전자주식회사 의류의 구김제거장치 및 그 방법
US20060150439A1 (en) * 2005-01-12 2006-07-13 Latack Thomas A Clothes dryer drive
KR20060102950A (ko) * 2005-03-25 2006-09-28 엘지전자 주식회사 드럼세탁기

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RU2463397C2 (ru) 2012-10-10
EP2042643A1 (de) 2009-04-01
RU2008138471A (ru) 2010-04-10

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