EP2014819B1 - Sèche-linge à micro-ondes - Google Patents

Sèche-linge à micro-ondes Download PDF

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Publication number
EP2014819B1
EP2014819B1 EP07112491A EP07112491A EP2014819B1 EP 2014819 B1 EP2014819 B1 EP 2014819B1 EP 07112491 A EP07112491 A EP 07112491A EP 07112491 A EP07112491 A EP 07112491A EP 2014819 B1 EP2014819 B1 EP 2014819B1
Authority
EP
European Patent Office
Prior art keywords
microwave
laundry drier
drying chamber
microwave energy
casing
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
EP07112491A
Other languages
German (de)
English (en)
Other versions
EP2014819A1 (fr
Inventor
Alberto Pezzutto
Giuseppe Dreossi
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
Original Assignee
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 DE602007012678T priority Critical patent/DE602007012678D1/de
Priority to ES07112491T priority patent/ES2362341T3/es
Priority to EP07112491A priority patent/EP2014819B1/fr
Priority to AT07112491T priority patent/ATE499477T1/de
Priority to PL07112491T priority patent/PL2014819T3/pl
Priority to RU2008128373/12A priority patent/RU2459896C2/ru
Publication of EP2014819A1 publication Critical patent/EP2014819A1/fr
Application granted granted Critical
Publication of EP2014819B1 publication Critical patent/EP2014819B1/fr
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
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment
    • D06F58/266—Microwave heating equipment

Definitions

  • the present invention relates to a microwave laundry drier.
  • Known laundry driers operate in various ways, and in particular may condense a stream of hot air blown into a drying drum to remove moisture from the laundry, or may exhaust the stream of moisture-laden hot air directly from the drier.
  • Known laundry driers comprise a ventilation system (i. e. usually a blower comprising a fan and an electric fan motor) and a heating arrangement, which draw air from outside, and heat and blow the air into and through the laundry drum; and the hot drying air is then either exhausted directly from the drier or fed to condensing means to condense the moisture collected in the hot air.
  • a known condensation laundry drier comprises a laundry drum; an air intake conduit for feeding the hot drying air into the drum through an inflow opening; and an air outlet or exhaust conduit for exhausting the hot drying air from the drum through an outflow opening.
  • the air conduits are connected to each other by a condenser for condensing the moisture in the hot drying air flowing through it.
  • drying is by indirect heating: an electric heating element heats an airflow, and the air removes moisture from the laundry.
  • standard drying cycle time can only be shortened by increasing either heating power or airflow.
  • a commercial drier heating element absorbs 2.2-2.4 kW electric power, and, since, in certain European countries (e.g. Italy), most houses have a contract which allows maximum electric power absorption from the mains of 3kW, no significant increase can be made in the heating power of the heating element.
  • airflow is limited by the size of the air ducts, fans, and the machine itself, increasing airflow is complicated and expensive, by involving complete redesign of the machine.
  • increasing airflow results in a corresponding increase in the noise level of the machine, and so calls for high-cost noise-damping improvements.
  • a microwave drier employing other heating technologies, such as microwaves. Microwaves show considerable potential in shortening drying time, by coupling directly with water (direct heating).
  • a microwave drier comprises a casing housing a drying chamber; a blower connected by a duct to the drying chamber to draw air through the chamber from openings in both the chamber and the casing; and a microwave energy source for directing microwave energy to the drying chamber.
  • the drying chamber may be in the form of a revolving tumble drum mounted inside the casing, or in the form of a stationary container; and airflow into the drying chamber may be preheated to improve removal of the evaporated moisture from the drying chamber.
  • CA 1 092 198 discloses, is a motorized clothes drier which is heated by microwaves. It consists of an outer stationary vented shell in which rotates a motorized drum. The shell is provided with a loading door which is in line with an opening in the drum. To the back of the loading door is attached a container in which is centrally located a reflector containing one or more microwave magnetron tubes. When the loading door is closed, the magnetron container penetrates partly into the drum. The rear of the drum is provided with a vented conical baffle which reflects the microwaves.
  • a drive for rotating the drum consisting of an electric motor, pulleys, and belt, is located within the shell. Also located within the shell is an exhaust fan which removes the air and vapour at a rate to create a partial vacuum within the drum.
  • the main problem in a microwave laundry drier is containing the microwaves inside the drying chamber, to ensure user safety and maximize energy transfer to the laundry, which means forming around the drying chamber a closed environment which perfectly reflects (and so contains) the microwaves.
  • the weak area of such a closed environment is the door, for loading/unloading wet/dry laundry into/from the drying chamber, and which constitutes a possible microwave leakage point.
  • Number 1 in Figure 1 indicates as a whole a laundry drier comprising a casing 2 resting on a floor on a number of feet.
  • Casing 2 supports a revolving laundry drum 3 which defines a drying chamber 4, rotates about a horizontal rotation axis 5 (in alternative embodiments not shown, rotation axis 5 may be tilted or vertical), and has a front access opening 6 closed by a door 7 hinged to a front wall of casing 2.
  • Drum 3 is rotated by an electric motor (not shown), and is fed through with a stream of drying air fed into drum 3 by an exhaust-type ventilation system 8 (i.e. in which the hot drying air from drum 3 is exhausted directly into the external environment).
  • Ventilation system 8 comprises an air intake conduit 9 for drawing in outside air, heating the air, and feeding the hot drying air into drum 3 through an inflow opening 10; an air exhaust conduit 11 for exhausting the moist, hot drying air from the drum to the outside through an outflow opening 12; and a centrifugal fan 13 and a heating device 14 located along air intake conduit 9.
  • ventilation system 8 may comprise a condenser located along air exhaust conduit 11 to condense the vapour in the stream of moist, hot air from drum 3, and at least part of the dry air from the condenser may be fed back into air intake conduit 9.
  • Microwave laundry drier 1 comprises a microwave energy source 15 for directing microwave energy to drying chamber 4.
  • microwave energy source 15 is fixed to a front panel 16, which is supported by casing 2 (in particular, may form part of or be fixed to casing 2) and has a central opening 17 coaxial with front access opening 6 of drying chamber 4.
  • Microwave energy source 15 comprises four magnetrons 18 arranged symmetrically around central opening 17 in front panel 16 and fixed (screwed) to the back of front panel 16 to prevent microwave leakage inwards of casing 2.
  • Each magnetron 18 has a magnetron body 19 located inside casing 2; and a magnetron antenna 20, which emits the microwave energy and is located outside casing 2 through a hole 21 in front panel 16.
  • microwave energy source 15 comprises, for each magnetron 18, a waveguide device 22 to guide the microwaves towards drying chamber 4.
  • Each waveguide device 22 comprises a housing 23, which is supported by front panel 16, surrounds magnetron antenna 20, and has an open side 24 towards the centre of central opening 17 in front panel 16.
  • Each waveguide device 22 also comprises a deflector 25, which is supported by door 7, when door 7 is closed, is located in front of open side 24 of housing 23, and is designed to direct the microwaves towards drying chamber 4.
  • each deflector 25 has an inclined surface 26 facing open side 24 of housing 23 when door 7 is closed.
  • air intake conduit 9 is connected to microwave energy source 15 so that at least part of the drying air flows past microwave energy source 15 to transfer heat from microwave energy source 15 to the drying air. More specifically, the fresh drying air (i.e. the drying air from outside, not yet heated by heating device 14) flows past magnetron bodies 19 of magnetrons 18 to cool magnetron bodies 19 and, at the same time, preheat the fresh drying air upstream from heating device 14 (which, of course, is located downstream from microwave energy source 15).
  • the fresh drying air i.e. the drying air from outside, not yet heated by heating device 14
  • the fresh drying air flows past magnetron bodies 19 of magnetrons 18 to cool magnetron bodies 19 and, at the same time, preheat the fresh drying air upstream from heating device 14 (which, of course, is located downstream from microwave energy source 15).
  • magnetrons 18 may have heat losses of up to 50% of energy supply. For example, to get 0.9 kW microwaves (nominally 1 kW), they need approximately 1.4 kW electric energy from the mains, and so dissipate into heat about 0.4-0.7 kW. Feeding the fresh drying air past microwave energy source 15 optimizes energy consumption, by virtue of all the electric energy supplied to magnetrons 18 being used for machine purposes : part is converted to microwave energy, and part is used to heat the drying air.
  • microwave laundry drier 1 comprises an annular reflecting element 27 surrounding central opening 17 in front panel 16 to form a microwave barrier.
  • annular reflecting element 27 may be supported by door 7, by front panel 16, or by casing 2.
  • annular reflecting element 27 creates an electromagnetic field discontinuity that blocks the microwaves, and is defined by a number of small T-shaped projections equal in size to one-quarter of the microwave energy wavelength to create impedance decoupling and reflect the microwaves.
  • Microwave laundry drier 1 as described above has numerous advantages, by being cheap and easy to implement, and by providing a rational arrangement of microwave energy source 15. More specifically, fixing microwave energy source 15 to the front panel provides for optimizing use of the inner volume of casing 2, for easy connection of air intake conduit 9 to microwave energy source 15, and for easily directing all the microwaves inside drying chamber 4, thus ensuring perfect microwave isolation.

Landscapes

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

Claims (14)

  1. Sèche-linge à micro-ondes (1) comprenant :
    une carcasse (2) comprenant un panneau avant (16) prévu avec une ouverture centrale (17) ;
    une chambre de séchage (4) logée à l'intérieur de la carcasse (2) et ayant une ouverture d'accès frontale (6) pour charger/décharger le linge ;
    une porte (7) articulée par rapport au panneau avant (16) de la carcasse (2) pour fermer l'accès à la chambre de séchage (4) ;
    une source d'énergie à micro-ondes (15) et un dispositif de guide d'ondes (22) pour diriger l'énergie à micro-ondes jusqu'à la chambre de séchage (4) en passant par l'ouverture d'accès frontale (6) ;
    le sèche-linge à micro-ondes (1) étant caractérisé en ce que la source d'énergie à micro-ondes (15) est fixée sur l'arrière du panneau avant (16) à l'intérieur de la carcasse (2).
  2. Sèche-linge à micro-ondes (1) selon la revendication 1, dans lequel la source d'énergie à micro-ondes (15) comprend au moins un magnétron (18) ayant un corps de magnétron (19) positionné à l'intérieur de la carcasse (2), et une antenne de magnétron (20) émettant l'énergie des micro-ondes et positionnée à l'extérieur de la carcasse (2) ; le panneau avant (16) comprenant un trou (21) à travers lequel l'antenne de magnétron (20) est montée.
  3. Sèche-linge à micro-ondes (1) selon la revendication 2, dans lequel la source d'énergie à micro-ondes (15) comprend un certain nombre de magnétrons (18) agencés symétriquement autour de l'ouverture centrale (17) du panneau avant (16).
  4. Sèche-linge à micro-ondes (1) selon la revendication 2 ou 3, et comprenant, pour chaque magnétron (18), un dispositif de guide d'ondes (22) pour guider les micro-ondes vers la chambre de séchage (4).
  5. Sèche-linge à micro-ondes (1) selon la revendication 4, dans lequel chaque dispositif de guide d'ondes (22) comprend un boîtier (23), qui est supporté par le panneau avant (16), entoure l'antenne de magnétron (20), et a un côté ouvert (24) vers le centre de l'ouverture centrale (17) dans le panneau avant (16).
  6. Sèche-linge à micro-ondes (1) selon la revendication 5, dans lequel chaque dispositif de guide d'ondes (22) comprend un déflecteur (25), qui est supporté par la porte (7), lorsque la porte (7) est fermée, est positionné en face du côté ouvert (24) du boîtier (23), et est conçu pour diriger les micro-ondes vers la chambre de séchage (4).
  7. Sèche-linge à micro-ondes (1) selon la revendication 5, dans lequel chaque déflecteur (25) a une surface inclinée (26) faisant face au côté ouvert (24) du boîtier (23) lorsque la porte (7) est fermée.
  8. Sèche-linge à micro-ondes (1) selon l'une quelconque des revendications 1 à 7, et comprenant un système de ventilation (8), qui souffle l'air de séchage à travers la chambre de séchage (4), et comprend un conduit d'admission d'air (9) pour alimenter l'air de séchage dans la chambre de séchage (4) par une ouverture d'écoulement entrant (10), et un conduit d'échappement d'air (11) pour évacuer l'air de séchage provenant de la chambre de séchage (4) par une ouverture d'écoulement sortant (12); le conduit d'admission d'air (9) est raccordé à la source d'énergie à micro-ondes (15) de sorte qu'au moins une partie de l'air de séchage s'écoule au-delà de la source d'énergie à micro-ondes (15) afin de transférer la chaleur de la source d'énergie à micro-ondes (15) à l'air de séchage.
  9. Sèche-linge à micro-ondes (1) selon la revendication 8, dans lequel le système de ventilation (8) comprend un dispositif de chauffage (14) positionné en aval de la source d'énergie à micro-ondes (15) pour chauffer l'air de séchage.
  10. Sèche-linge à micro-ondes (1) selon l'une quelconque des revendications 1 à 9, et comprenant un élément de réflexion annulaire (27), qui entoure l'ouverture centrale (17) dans le panneau avant (16) afin de créer une barrière aux micro-ondes.
  11. Sèche-linge à micro-ondes (1) selon la revendication 10, dans lequel l'élément de réflexion annulaire (27) est supporté par la porte (7).
  12. Sèche-linge à micro-ondes (1) selon la revendication 10, dans lequel l'élément de réflexion annulaire (27) est supporté par le panneau avant (16) ou la carcasse (2).
  13. Sèche-linge à micro-ondes (1) selon la revendication 10, 11 ou 12, dans lequel l'élément de réflexion annulaire (27) crée une discontinuité de champ électromagnétique qui bloque les micro-ondes, et est défini par un certain nombre de petites saillies en forme de T égales du point de vue de la taille à un quart de la longueur d'onde de l'énergie à micro-ondes afin de créer un découplage d'impédance et réfléchir les micro-ondes.
  14. Sèche-linge à micro-ondes (1) selon l'une quelconque des revendications 1 à 13, dans lequel la chambre de séchage (4) est définie par un tambour de linge rotatif (3).
EP07112491A 2007-07-13 2007-07-13 Sèche-linge à micro-ondes Not-in-force EP2014819B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE602007012678T DE602007012678D1 (de) 2007-07-13 2007-07-13 Mikrowellen-Wäschetrockner
ES07112491T ES2362341T3 (es) 2007-07-13 2007-07-13 Secadora de ropa por microondas.
EP07112491A EP2014819B1 (fr) 2007-07-13 2007-07-13 Sèche-linge à micro-ondes
AT07112491T ATE499477T1 (de) 2007-07-13 2007-07-13 Mikrowellen-wäschetrockner
PL07112491T PL2014819T3 (pl) 2007-07-13 2007-07-13 Pralnicza suszarka mikrofalowa
RU2008128373/12A RU2459896C2 (ru) 2007-07-13 2008-07-11 Микроволновая сушильная машина для белья

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07112491A EP2014819B1 (fr) 2007-07-13 2007-07-13 Sèche-linge à micro-ondes

Publications (2)

Publication Number Publication Date
EP2014819A1 EP2014819A1 (fr) 2009-01-14
EP2014819B1 true EP2014819B1 (fr) 2011-02-23

Family

ID=38667073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07112491A Not-in-force EP2014819B1 (fr) 2007-07-13 2007-07-13 Sèche-linge à micro-ondes

Country Status (6)

Country Link
EP (1) EP2014819B1 (fr)
AT (1) ATE499477T1 (fr)
DE (1) DE602007012678D1 (fr)
ES (1) ES2362341T3 (fr)
PL (1) PL2014819T3 (fr)
RU (1) RU2459896C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436236B (zh) * 2016-11-28 2018-10-23 广东美的厨房电器制造有限公司 一种干衣机
CN106868827B (zh) * 2017-04-12 2023-06-23 广东美的厨房电器制造有限公司 微波干衣机
CN106868828B (zh) * 2017-04-12 2023-07-25 广东美的厨房电器制造有限公司 微波干衣机
CN113668203A (zh) * 2021-09-14 2021-11-19 宁波乐士实业有限公司 一种迷你型滚筒干衣机及其使用方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1092198A (fr) * 1977-04-04 1980-12-23 James A. Toyne Secheuse micro-ondes a chicane conique a event
CH650540A5 (de) * 1980-07-02 1985-07-31 Christian Jansson Verfahren zum erwaermen von waschwasser sowie wasch- und/oder trockenmaschine zur ausfuehrung des verfahrens.
US4510361A (en) * 1982-05-03 1985-04-09 Mahan Douglas P Horizontal axis tumbler type microwave drying mechanism
US4510697A (en) * 1983-01-19 1985-04-16 Gary Beasley Microwave clothes dryer
RU2078522C1 (ru) * 1993-09-14 1997-05-10 Валерий Николаевич Громыко Универсальная сушильная установка комбинированного действия
DE19642968A1 (de) * 1996-10-18 1998-04-23 Tkadlec Stanislav Dipl Ing Trommel-Trocknungskammer, insbesondere für Textilien, mit in der Ladetür eingebauter Mikrowellen-Wärmequelle
DE19828242A1 (de) * 1998-06-25 1999-12-30 Aeg Hausgeraete Gmbh Wäschebehandlungsmaschine, insbesondere Waschtrockner
WO2005059230A1 (fr) * 2003-12-15 2005-06-30 Arcelik Anonim Sirketi Machine a laver et a secher

Also Published As

Publication number Publication date
RU2459896C2 (ru) 2012-08-27
RU2008128373A (ru) 2010-01-20
PL2014819T3 (pl) 2011-09-30
ATE499477T1 (de) 2011-03-15
DE602007012678D1 (de) 2011-04-07
ES2362341T3 (es) 2011-07-01
EP2014819A1 (fr) 2009-01-14

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