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WO1996039791A1 - Four a micro-ondes - Google Patents

Four a micro-ondes Download PDF

Info

Publication number
WO1996039791A1
WO1996039791A1 PCT/SE1996/000733 SE9600733W WO9639791A1 WO 1996039791 A1 WO1996039791 A1 WO 1996039791A1 SE 9600733 W SE9600733 W SE 9600733W WO 9639791 A1 WO9639791 A1 WO 9639791A1
Authority
WO
WIPO (PCT)
Prior art keywords
oven
microwave oven
room
microwave
directional couplers
Prior art date
Application number
PCT/SE1996/000733
Other languages
English (en)
Inventor
Göran Öjelid
Original Assignee
Miratron Ag
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 Miratron Ag filed Critical Miratron Ag
Priority to AU60209/96A priority Critical patent/AU6020996A/en
Publication of WO1996039791A1 publication Critical patent/WO1996039791A1/fr

Links

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
    • H05B6/705—Feed lines using microwave tuning
    • 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
    • H05B6/72—Radiators or antennas
    • 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
    • H05B6/78—Arrangements for continuous movement of material
    • 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 microwave oven according to the invention is above all characterized in that 10 each generator is connected to the oven room through a separate impedance match element and a separate directional coupler.
  • the directional couplers are arranged such that they can be adjusted from the outside of the oven room with respect to their direction of radiation - also when the 15 generators are in operation, and that this is also possible with the aid of electric motors.
  • Fig. 1 shows an oven in a vertical section
  • Fig. 2 shows an impedance match element in a side view
  • Fig. 3 shows the element with a directional coupler.
  • a microwave oven is constructed according to a tunnel having side walls 1, 2, bottom 3 and top wall 4.
  • Several large venting openings 34 are provided in the top wall 4.
  • a large door 5 is provided which may be moved upwards in a vertical direction by means which are not further described here.
  • the door is slightly- wedge-shaped.
  • a roller way 6 is provided which may be driven from the outside in a per se known manner.
  • Three rows of microwave generators 10 are provided on the walls 1, 2. The generators are of the per se known magnetron type and
  • each generator is fed as usual trough a high-tension transformer, having a diode and a capacitor coupled thereafter, as well as a heating transformer with net energy.
  • Their HF-output is transmitted by an antenna 11 from the magnetron to the element 7 for impedance matching.
  • a directional coupler 12 in the form of a metal rod 13 having a spiral element 14 connected to it, said rod 13 being parallel to the antenna 11.
  • the directional antenna is supported by a shaft 18 of a ceramic material such as for example aluminium oxide.
  • the shaft 18 extends outwards through the element and is at that location provided with an arm 19.
  • the rod 13 extends through a sleeve 20 having about 2.5 times greater inside diameter, into the oven room where it supports the spiral 14.
  • the sleeve 20 at the same time serves as a coupling between the element 11 and the oven wall 1 and is at the inside of the oven room fastened by a nut 21.
  • the impedance match element functions according to a per se known principle such that it fixes the distance between the antenna 11 and the rod 13 as well as the distances to the respective surrounding and common metal walls.
  • the device functions according to the following.
  • Objects 30 to be treated such as for example mould cores made of sand and binding agent having paint thereon, are standing on a pallet 31 and are slowly moved through the oven by the roller way 6.
  • a number of magnetrons are successively connected to the current net and transmit their HF-output through the directional couplers onto the objects.
  • the directional couplers which are comprised of spirals in per se known way, transmit their output in the form of unsymmetrically joumalled lobes, the output will meet the objects primary at different locations.
  • An adjustment in order to obtain an optimal completion may be achieved very simply by individually adjusting the directional coupler with the aid of the arm 19. This brings about several advantages.
  • the efficiency is essentially higher because the treatment of the objects is based on primary radiation in stead of as to date, common distribution through reflections against the oven walls.
  • the radiation may be adjusted to the shape of the objects, such that thinner or otherwise sensitive parts are subject to less radiation.
  • a standardised arrangement of the oven for a large pallet of objects may be optimized in the easiest way.
  • the adjustment of the directional couplers is achieved by electrical so called step- motors which are connected to the shafts.
  • the motors are fed through a programmable device and particularly such, that the once determined adjustment is stored under a certain code number as a fixed part of a program.
  • the code consists of a determined number for each directional coupler.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

La présente invention concerne un four à micro-ondes destiné à un usage industriel, en particulier au séchage d'objets dans un processus continu. Il comprend un système de transport des objets à l'intérieur du four ainsi que plusieurs générateurs de micro-ondes. L'invention est principalement caractérisée en ce que chaque générateur (10) est relié à l'intérieur du four par l'intermédiaire d'un élément distinct d'adaptation d'impédance (7) et d'un coupleur directionnel distinct (12). Dans un mode de réalisation préféré, les coupleurs directionnels sont disposés de telle façon que la direction d'émission de leur rayonnement puisse être modifiée de l'extérieur du four, même pendant que les générateurs sont en marche, et que cela soit aussi possible à l'aide de moteurs électriques.
PCT/SE1996/000733 1995-06-03 1996-06-03 Four a micro-ondes WO1996039791A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60209/96A AU6020996A (en) 1995-06-03 1996-06-03 Microwave oven

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1657/95-1 1995-06-03
CH165795 1995-06-03

Publications (1)

Publication Number Publication Date
WO1996039791A1 true WO1996039791A1 (fr) 1996-12-12

Family

ID=4215585

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000733 WO1996039791A1 (fr) 1995-06-03 1996-06-03 Four a micro-ondes

Country Status (2)

Country Link
AU (1) AU6020996A (fr)
WO (1) WO1996039791A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851712A2 (fr) * 1996-12-24 1998-07-01 Industrie-Ofenbau Rudolf Brands GmbH Four pour le traitement à haute température
WO1999004275A1 (fr) * 1997-07-15 1999-01-28 Moulinex S.A. Dispositif et procede de reflectometrie hyperfrequences, et four a micro-ondes ainsi equipe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4324965A (en) * 1979-07-25 1982-04-13 Hermann Berstorff Maschinenbau Gmbh Microwave heating method and apparatus including adjustable tuning members
US4616120A (en) * 1984-07-31 1986-10-07 Yuji Maruyama Microwave-heating apparatus having means for measuring reflection coefficient under low power operation
US5200588A (en) * 1990-11-19 1993-04-06 Doryokuro Kakunenryo Kaihatsu Jigyodan Microwave heating apparatus having impedance matching adjustable waveguide
US5347108A (en) * 1992-01-23 1994-09-13 Sharp Kabushiki Kaisha Microwave oven having a function for matching impedance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4324965A (en) * 1979-07-25 1982-04-13 Hermann Berstorff Maschinenbau Gmbh Microwave heating method and apparatus including adjustable tuning members
US4616120A (en) * 1984-07-31 1986-10-07 Yuji Maruyama Microwave-heating apparatus having means for measuring reflection coefficient under low power operation
US5200588A (en) * 1990-11-19 1993-04-06 Doryokuro Kakunenryo Kaihatsu Jigyodan Microwave heating apparatus having impedance matching adjustable waveguide
US5347108A (en) * 1992-01-23 1994-09-13 Sharp Kabushiki Kaisha Microwave oven having a function for matching impedance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 18, No. 573; & JP,A,06 215 871 (HITACHI HOME TEC. LTD.), 5 August 1994. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0851712A2 (fr) * 1996-12-24 1998-07-01 Industrie-Ofenbau Rudolf Brands GmbH Four pour le traitement à haute température
EP0851712A3 (fr) * 1996-12-24 1998-09-16 Industrie-Ofenbau Rudolf Brands GmbH Four pour le traitement à haute température
WO1999004275A1 (fr) * 1997-07-15 1999-01-28 Moulinex S.A. Dispositif et procede de reflectometrie hyperfrequences, et four a micro-ondes ainsi equipe

Also Published As

Publication number Publication date
AU6020996A (en) 1996-12-24

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