EP0853866B1 - Abschirmmittel für mikrowellen - Google Patents

Abschirmmittel für mikrowellen Download PDF

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Publication number
EP0853866B1
EP0853866B1 EP96931354A EP96931354A EP0853866B1 EP 0853866 B1 EP0853866 B1 EP 0853866B1 EP 96931354 A EP96931354 A EP 96931354A EP 96931354 A EP96931354 A EP 96931354A EP 0853866 B1 EP0853866 B1 EP 0853866B1
Authority
EP
European Patent Office
Prior art keywords
microwave
inwards
microwave appliance
fold
metal 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.)
Expired - Lifetime
Application number
EP96931354A
Other languages
English (en)
French (fr)
Other versions
EP0853866A1 (de
Inventor
Leif Gösta Zettergren
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0853866A1 publication Critical patent/EP0853866A1/de
Application granted granted Critical
Publication of EP0853866B1 publication Critical patent/EP0853866B1/de
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
    • H05B6/70—Feed lines
    • 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

  • Microwave technologies bring great advantages for heating of different kinds. For that reason it is used to an increasing extent. Microwaves are considered to cause danger for damages to many organisms including humans and other warm-blooded animals. A fundamental condition at all uses of microwave technology is a reliable shielding against leakage of microwaves.
  • shielding is not a large problem. Metals are good reflectors for microwaves and do not release radiation. Even where a certain degree of ventilation is required shielding can with relative ease be arranged by perforated plates or nets of a suitable metal. The apertures in the plate or net must be dimensioned not to let radiation through.
  • microwaves are used for high-speed drying of paint applied at road surfaces.
  • the shielding problem is solved by using an undefined microwave absorbing material. This implies a comparatively large distance between the microwave generator and the shielding material. Otherwise, the material would be subjected to unacceptable heating.
  • microwaves are used for the drying of material, for instance wood pieces, placed on a transport chain.
  • the drying equipment is designed as a closed box with openings at each end for in and out passage of chain and material.
  • shielding at the openings sloping flaps, opening in the movement direction, are used.
  • the arrangement is requiring much space in the longitudinal direction, partly since the flaps need space for the movement, partly since the shielding, to be sufficiently effective, must be completed with comparatively long distances between the microwave source and the opening.
  • the method is useful in an equipment with stationary microwave sources and mobile drying material.
  • UK patents no 630,738 and 1,034,448 also concern drying of material placed on a transport belt here made of a dielectric material.
  • a box is proposed. This box is closed at the borders of the belt and has slits in opposite walls for the in and out passage of belt and material.
  • a design is used, which lets the upper and lower part of the enclosure separate for the in and out passage of drying material and close together during the heating and drying phase, i.e. when the microwave apparatus is active.
  • the cause of the effect is not completely clarified, but one may assume that it relates to the geometry of the radiation.
  • Common microwave generators deliver electromagnetic radiation in the range around 12 cm. The wave motion propagates itself linearly.
  • Microwave appliances often consist of parallelepipedic plate boxes with one or more magnetrons placed at the top of the box.
  • the radiation source may be considered point-shaped and spreading radiation uniformly in all directions except upwards.
  • the plate material reflects the radiation. The consequence is that one gets a system of standing waves in the enclosed chamber.
  • border width is as large as or larger than the gap width.
  • the border width For wheel provided microwave dryers, such as described in SE9400715-0, standing on rails consisting of plastic pipes of the type use for electric installations this means a border width of 10 to 35 mm.
  • Fig. 1 shows a sketch of one side of a microwave device, which has been provided with an aluminium brim at the bottom border.
  • Fig. 2 shows a corresponding sketch of a microwave appliance with a fold pointing inwards with respect to the casing at the lower part of the casing plate.
  • Fig. 3 shows one side of a microwave appliance where the inner shielding net has been drawn down along the equipment casing and folded to get border widening.
  • (1) stands for the outer wall of the equipment casing, (1') for a fold pointing inwards with respect to casing, (2) for a border widening rim, applied to the equipment casing, (3) for a metal net impervious to microwaves and (3') for a drawn in border of this net, and (6) for the surface that the microwave appliance is working on.
  • the widening can be done by giving the bottom border a rim of a suitable metal for instance aluminium, which is a very good microwave reflector.
  • the plate casing may be folded at the lower border to get the widening.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Drying Of Solid Materials (AREA)
  • Electric Ovens (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Glass Compositions (AREA)
  • Surgical Instruments (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (2)

  1. Verfahren zur Verringerung des Mikrowellenaustritts aus einem nach unten offenen Mikrowellengerät, welches zum Trocknen oder Wärmebehandeln von Böden, Wänden und Decken dient und automatisch über eine stationäre Oberfläche bewegt wird, wobei das Mikrowellengerät speziell für Einrichtungen zum Trocknen oder Behandeln von Oberflächen verwendet wird, die von Wänden oder Begrenzungen begrenzt sind, wo das Trocknen bzw. die Wärmebehandlung nahe an der Wand oder Begrenzung erfolgen muß, wobei das Verfahren
    gekennzeichnet ist durch die Verwendung eines verbreiterten Randes (2) an der der stationären Oberfläche (6) zugewandten Unterseite zum Vergrößern der Distanz, die austretende Strahlung beim Durchgang durch einen schmalen Spalt zwischen dem verbreiterten Rand und der darunter befindlichen stationären Oberfläche durchlaufen muß, wobei der verbreiterte Rand nach innen zum Inneren des Mikrowellengehäuses des Mikrowellengerätes gerichtet ist, wobei der verbreiterte Rand umfaßt:
    a) eine metallische Leiste, die an der Innenseite der Metallgehäuseplatten (1) des Mikrowellengerätes angebracht ist, oder
    b) eine nach innen gerichtete Abkantung (1'), die im unteren Teil der Metallgehäuseplatten abgekantet ist, oder
    c) eine nach innen gerichtete Abkantung (3'), die an einen inneren Abschirmungsnetz (3) vorgesehen ist, wobei das Netz in dem Metallgehäuse angeordnet ist und sich nach unten zum offenen Boden des Metallgehäuses erstreckt, und wobei das Abschirmungsnetz nach innen abgekantet ist, um die nach innen gerichtete Abkantung (3') in dem Abschirmungsnetz zu erhalten.
  2. Mobiles Mikrowellengerät mit verringertem Austreten von Mikrowellen, wobei das Mikrowellengerät zum Trocknen oder Wärmebehandeln von Böden, Wänden oder Decken usw. dient und automatisch über eine stationäre Oberfläche (6) bewegt wird, wobei das Trocknen bzw. Behandeln in der Nähe von Begrenzungen der stationären Oberfläche erfolgen muß, wobei das Mikrowellengerät gekennzeichnet ist durch einen verbreiterten Rand an seiner der stationären Oberfläche zugewandten Unterseite, wobei der verbreiterte Rand nach innen im Inneren des Mikrowellengehäuses des Mikrowellengerätes gerichtet ist, wobei der verbreiterte Rand vorliegt als
    a) eine Metalleiste an der Innenseite der Metallgehäuseplatten (1) des Mikrowellengerätes, oder
    b) eine nach innen gerichtete Abkantung (1') in den Metallplatten oder
    c) eine nach innen gerichtete Abkantung (3') in einem Abschirmungsnetz (3), das in dem Metallgehäuse angeordnet ist, wobei sich das Netz nach unten zum offenen Boden des Metallgehäuses erstreckt.
EP96931354A 1995-09-22 1996-09-20 Abschirmmittel für mikrowellen Expired - Lifetime EP0853866B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9503308A SE505240C2 (sv) 1995-09-22 1995-09-22 Skydd mot mikrovågor
SE9503308 1995-09-22
PCT/SE1996/001170 WO1997011579A1 (en) 1995-09-22 1996-09-20 Microwave shielding

Publications (2)

Publication Number Publication Date
EP0853866A1 EP0853866A1 (de) 1998-07-22
EP0853866B1 true EP0853866B1 (de) 2002-07-03

Family

ID=20399581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96931354A Expired - Lifetime EP0853866B1 (de) 1995-09-22 1996-09-20 Abschirmmittel für mikrowellen

Country Status (6)

Country Link
EP (1) EP0853866B1 (de)
AT (1) ATE220286T1 (de)
AU (1) AU7005796A (de)
DE (1) DE69622179T2 (de)
SE (1) SE505240C2 (de)
WO (1) WO1997011579A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE517262C2 (sv) 1998-04-29 2002-05-14 Leif Goesta Zettergren Förfarande för skydd mot mikrovågsstrålning vid torkning av våtskadade utrymmen
AT504855B8 (de) * 2007-01-29 2009-01-15 Sauli Gerhard Anlage zur herstellung eines holzprofils und damit hergestelltes holzprofil

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB630738A (en) * 1946-06-01 1949-10-20 British Thomson Houston Co Ltd Improvements in and relating to high frequency dielectric heating apparatus
GB1034448A (en) * 1965-01-05 1966-06-29 Tappan Co Improvements in high frequency ovens
US4765773A (en) * 1987-02-27 1988-08-23 Hopkins Harry C Microwave highway paint drying apparatus

Also Published As

Publication number Publication date
DE69622179T2 (de) 2003-02-13
EP0853866A1 (de) 1998-07-22
SE505240C2 (sv) 1997-07-21
WO1997011579A1 (en) 1997-03-27
AU7005796A (en) 1997-04-09
SE9503308L (sv) 1997-03-23
SE9503308D0 (sv) 1995-09-22
ATE220286T1 (de) 2002-07-15
DE69622179D1 (de) 2002-08-08

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