EP0967841B1 - Dispositif portable de séchage utilisant des micro-ondes - Google Patents

Dispositif portable de séchage utilisant des micro-ondes Download PDF

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Publication number
EP0967841B1
EP0967841B1 EP99660105A EP99660105A EP0967841B1 EP 0967841 B1 EP0967841 B1 EP 0967841B1 EP 99660105 A EP99660105 A EP 99660105A EP 99660105 A EP99660105 A EP 99660105A EP 0967841 B1 EP0967841 B1 EP 0967841B1
Authority
EP
European Patent Office
Prior art keywords
application chamber
housing
partition
wave tube
set forth
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.)
Expired - Lifetime
Application number
EP99660105A
Other languages
German (de)
English (en)
Other versions
EP0967841A3 (fr
EP0967841A2 (fr
Inventor
Esko Taipale
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.)
ELMATEC Oy
Original Assignee
ELMATEC Oy
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 ELMATEC Oy filed Critical ELMATEC Oy
Publication of EP0967841A2 publication Critical patent/EP0967841A2/fr
Publication of EP0967841A3 publication Critical patent/EP0967841A3/fr
Application granted granted Critical
Publication of EP0967841B1 publication Critical patent/EP0967841B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6402—Aspects relating to the microwave cavity
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/70—Drying or keeping dry, e.g. by air vents
    • E04B1/7007—Drying or keeping dry, e.g. by air vents by using electricity, e.g. electro-osmosis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/003—Small self-contained devices, e.g. portable
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair

Definitions

  • the present invention relates to a portable drying apparatus for drying structures by means of microwaves, said apparatus comprising a housing divided by a partition into two compartments, the first compartment thereof housing a magnetron and the second compartment constituting an application chamber for radiation, which is confined by said partition and metal side walls on five flanks, the sixth flank being permeable to radiation for the transmission of radiated power from the application chamber to a structure to be dried.
  • This type of drying apparatus is disclosed in the Applicant's patent publication
  • An object of the invention is to provide a cost-efficient drying apparatus, wherein the matching of power transmission and uniformity of field are improved while avoiding the reflection of energy back to the magnetron.
  • a substantially cubic-shaped housing 1 is made of metal sheets and the housing dimensions can be e.g. 40 cm x 40 cm x 40 cm.
  • the housing is divided by a partition 13 into two compartments, the first housing a magnetron 4 functioning as a radiation-generating power source and the second compartment constituting an application chamber 2, functioning as a radiation transmission antenna and confined by the partition 13 and metal side walls 3 on five flanks.
  • the application chamber 2 has a sixth flank which is permeable to radiation for the transmission of radiated power from the chamber 2 to a structure to be dried.
  • the apparatus employs a conventional technical unit of a home microwave oven, comprising the magnetron 4 provided with a drive circuit, an operating switch 5, and a wave tube 7.
  • the housing element of a home microwave oven or at least part of its housing element is removed in order to fit the unit as a power source in the housing 1.
  • the magnetron-fitted power source 4 is positioned in such a way that a transmission aperture 8 of the wave tube 7 coincides with an aperture present in the partition 13.
  • the application chamber 2 is provided with a metal reflector cone, supported by a dielectric plate 10 and having its apex pointing towards the transmission aperture 8 of the wave tube 7.
  • a plane wave propagating directly down from the aperture 8 reflects from the surface of a cone 9 by way of the walls of the application chamber 2 downwards in a more uniformly distributed fashion.
  • the dielectric plate 10, placed at a proper height and having a proper thickness, contributes to a uniform distribution of the field and at the same time constitutes a support for the cone 9.
  • the plate 10 is distanced from a plane defined by the edges of the open flank of the chamber 2 by a spacing S which is within the range of 60 -100 mm.
  • the plate 10 has a thickness which is e.g.
  • the plate thickness is e.g. about 20 mm, if the microwave has a frequency of 2,4 GHz.
  • the reflector cone 9 has a base diameter of e.g. 100 mm and a height of about 100 mm, as well.
  • the cone 9 can be adapted to be vertically movable, if it is desirable to further enhance the uniformity of field.
  • the described arrangement is also effective in eliminating the hazardous situation, wherein the power is not able to get out of the chamber 2 e.g. to a dry wall structure but, instead, endeavours to work its way back to the magnetron by way of the wave tube 7. Such a path for back reflection does not exist and, hence, a possible back reflection remains highly insignificant.
  • the wall of the wave tube 7 opposite to a radiation source 6 of the magnetron is set an angle of either 90° or 45° relative to the partition 13. Tests have indicated that good results are obtained with both wall directions. Furthermore, in view of diminishing back reflection and providing a more uniform field, it is beneficial that between the radiation source 6 and the application chamber 2 be fitted a wall of the wave tube 7 for blocking the transmission of radiated power from the radiation source 6 directly into the application chamber 2 and vice versa.
  • the application chamber 2 has the edges of its open flank fitted with microswitches 11, which operate as limit switches and which both must be pressed in before the magnetron 4 starts up. This makes sure that radiation cannot be accidentally directed out of the apparatus until the apparatus is set against a surface to be dried, which is capable of absorbing radiation energy.
  • the housing 1 has two opposite walls 3 thereof provided with sliding wall sections 12 which, in an extended condition, constitute triangular extensions for the stationary box walls 3.
  • the application chamber 2 can be fitted tightly against a corner defined by walls or by a wall and a floor.
  • the housing 1 is further provided with a handle 14 for carrying the apparatus along.
  • An apparatus of the invention can be used for drying, directly from the surface of a structure without damaging the structures, e.g. extemal and partition walls of buildings, pillars, balconies, sub-floors, underground passages, floors, basement structures, and roofs in new construction as well as at renovation sites. For example, wet and damaged bathroom wall and floor coverings are removed. Wet floats and cements are dressed and milled down to the neat concrete or brick surface, followed by drying the wall and floor structures by means of an apparatus of the invention. This speeds up renovation work.
  • structures e.g. extemal and partition walls of buildings, pillars, balconies, sub-floors, underground passages, floors, basement structures, and roofs in new construction as well as at renovation sites.
  • wet and damaged bathroom wall and floor coverings are removed.
  • Wet floats and cements are dressed and milled down to the neat concrete or brick surface, followed by drying the wall and floor structures by means of an apparatus of the invention. This speeds up renovation work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Microbiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Architecture (AREA)
  • Health & Medical Sciences (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Drying Of Solid Materials (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (7)

  1. Appareil de séchage portable pour sécher des structures au moyen de micro-ondes, ledit appareil comprenant un boîtier (1) séparé par une cloison (13) en deux compartiments, le premier compartiment du boîtier abritant un magnétron (4) couplé à un tube à ondes (7) pour guider les micro-ondes et le second compartiment constituant une chambre d'application (2) pour les rayonnements, qui est confinée par ladite cloison (13) et des parois latérales en métal (3) sur cinq flancs, le sixième flanc étant perméable aux rayonnements pour transmettre la puissance irradiée depuis la chambre d'application (2) vers une structure à sécher, caractérisé en ce que le tube à ondes (7) comporte une ouverture de transmission (8) située de façon à coïncider avec une ouverture présente dans la cloison (13), et que la chambre d'application (2) abrite un cône réflecteur métallique (9), soutenu par une plaque diélectrique (10) et dont l'extrémité pointe en direction de l'ouverture de transmission (8) du tube à ondes (7).
  2. Appareil selon la revendication 1, caractérisé en ce que la plaque diélectrique (10) est située à une distance (D) comprise entre 60 et 100 mm par rapport à un plan défini par les bords (11) du flanc ouvert de la chambre d'application (2).
  3. Appareil selon la revendication 1 ou 2, caractérisé en ce que le boîtier (1) a des dimensions qui, en centimètres, avoisinent 40 x 40 x 40, et en ce que la cloison (13) sépare le boîtier en des compartiments sensiblement égaux.
  4. Appareil selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'épaisseur de la plaque diélectrique (10) avoisine ¼ de la longueur d'une onde appliquée au fur et à mesure de sa propagation dans un matériau diélectrique constituant ladite plaque.
  5. Appareil selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la paroi du tube à ondes (7) située à l'opposé d'une source de rayonnement (6) du magnétron (4) est placée à un angle de 90 ou de 45 par rapport à la cloison (13).
  6. Appareil selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il existe entre la source de rayonnement (6) et la chambre d'application (2) une paroi du tube à ondes (7) pour bloquer la transmission de la puissance irradiée depuis la source de rayonnement (6) directement dans la chambre d'application (2).
  7. Appareil selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le boîtier (1) comporte deux cloisons opposées (3) pourvues de sections de parois coulissantes (12) qui, en condition étirée, constituent des extensions triangulaires pour les parois de boîte fixes (3) destinées à ajuster la chambre d'application (2) de façon étanche par rapport à un angle défini par les structures à sécher, telles que les parois ou une paroi et un plancher.
EP99660105A 1998-06-25 1999-06-08 Dispositif portable de séchage utilisant des micro-ondes Expired - Lifetime EP0967841B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981463 1998-06-25
FI981463A FI103917B1 (fi) 1998-06-25 1998-06-25 Kannettava mikroaaltokuivauslaite

Publications (3)

Publication Number Publication Date
EP0967841A2 EP0967841A2 (fr) 1999-12-29
EP0967841A3 EP0967841A3 (fr) 2000-05-03
EP0967841B1 true EP0967841B1 (fr) 2006-09-13

Family

ID=8552071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99660105A Expired - Lifetime EP0967841B1 (fr) 1998-06-25 1999-06-08 Dispositif portable de séchage utilisant des micro-ondes

Country Status (4)

Country Link
EP (1) EP0967841B1 (fr)
AT (1) ATE339870T1 (fr)
DE (1) DE69933170T2 (fr)
FI (1) FI103917B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3293069B2 (ja) * 1999-05-28 2002-06-17 エリー株式会社 被加熱物の加熱方法及びその装置
FR2812166B1 (fr) * 2000-07-21 2002-12-13 Commissariat Energie Atomique Applicateur de micro-ondes focalisant
FR2832022B1 (fr) * 2001-11-06 2003-12-19 Christian Lincot Procede et dispositif d'application in situ d'un champ electrique intense a puissance variable pour des traitements localises
WO2005079116A2 (fr) * 2004-02-11 2005-08-25 Micro Heat Limited Procede et appareil de chauffage d'une charge fluidique par energie radiofrequence

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1082801A (fr) * 1977-03-08 1980-07-29 Michael A. Hamid Dissipation du brouillard par courant micro-ondes
DK86888A (da) * 1988-02-19 1989-08-20 Winterthur Borgen A S Fremgangsmaade ved behandling af bygningskonstruktioner, der er inficeret med skadelige organismer, til uskadeliggoerelse af disse
FI905484A (fi) 1990-11-05 1992-05-06 Rakennustoimisto Jukka Napari Torkningsfoerfarande och -anordning.

Also Published As

Publication number Publication date
DE69933170T2 (de) 2007-09-06
FI981463A (fi) 1999-10-15
FI981463A0 (fi) 1998-06-25
FI103917B (fi) 1999-10-15
ATE339870T1 (de) 2006-10-15
FI103917B1 (fi) 1999-10-15
EP0967841A3 (fr) 2000-05-03
DE69933170D1 (de) 2006-10-26
EP0967841A2 (fr) 1999-12-29

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