EP0069105B1 - Industrial modular microwave oven - Google Patents

Industrial modular microwave oven Download PDF

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Publication number
EP0069105B1
EP0069105B1 EP82870033A EP82870033A EP0069105B1 EP 0069105 B1 EP0069105 B1 EP 0069105B1 EP 82870033 A EP82870033 A EP 82870033A EP 82870033 A EP82870033 A EP 82870033A EP 0069105 B1 EP0069105 B1 EP 0069105B1
Authority
EP
European Patent Office
Prior art keywords
microwave
middle compartment
openings
partitions
compartments
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
Application number
EP82870033A
Other languages
German (de)
French (fr)
Other versions
EP0069105A1 (en
Inventor
Pieter Luypaert
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.)
De Belgische Staat L'etat Belge Represente Par Le Secretaire General Des Services De Programmation
Original Assignee
De Belgische Staat L'etat Belge Represente Par Le Secretaire General Des Services De Programmation
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 De Belgische Staat L'etat Belge Represente Par Le Secretaire General Des Services De Programmation filed Critical De Belgische Staat L'etat Belge Represente Par Le Secretaire General Des Services De Programmation
Priority to AT82870033T priority Critical patent/ATE19334T1/en
Publication of EP0069105A1 publication Critical patent/EP0069105A1/en
Application granted granted Critical
Publication of EP0069105B1 publication Critical patent/EP0069105B1/en
Expired legal-status Critical Current

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    • 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 present invention relates to a modular industrial microwave oven for drying or heat treatment of products by microwave.
  • the invention relates to a continuously operating device which, by its modular structure, is suitable for most industrial energy uses ranging from 10 to several hundred kilowatts.
  • a microwave oven which is characterized by at least one module consisting of a metal box divided into three compartments by partitions having openings, by several microwave generators, for example 25 at 50 low power magnetrons, these generators being arranged in the external compartments such that the hot air is propagated directly in the median compartment by said openings in the partitions, the median compartment constituting the applicator oven proper.
  • Several waveguides are mounted on the metal box with radiators so that the maximum amount of microwave energy is applied in the middle compartment.
  • FIG. 1 schematically illustrates a common microwave installation
  • fig. 2 is a perspective view of an embodiment of a microwave module according to the invention
  • fig. 3 is a schematic sectional view of the embodiment of FIG. 2.
  • fig. 1 shows the construction of a usual industrial microwave installation.
  • the reference 1 designates a microwave generator which is connected by an isolator 2 and a passive transfer part 3, for example a circulator, to a microwave applicator 4 in which the product to be treated is placed.
  • Figs. 2 and 3 show a modular unit according to the invention.
  • This unit 10 essentially comprises a metal box 1 divided into three compartments 11, 12 and 13 by partitions 14 and 15.
  • the external compartments 11 and 13 contain the power units including a group of microwave or magnetron generators 4 and the power transformers 8; the middle compartment 12 forms the actual applicator in which the product is treated.
  • the partitions 14 and 15 between the compartments have openings, 16 and 17 respectively.
  • the magnetrons 4 are arranged relative to these openings 16 and 17 in such a way that the hot air coming from the cooling of the magnetrons is propagated directly in the applicator compartment 12.
  • the openings 16 and 17 are each provided with a screen 18.
  • the microwave energy of the magnetrons is applied in the compartment 12 by means of radiators 3 which are uniformly distributed along each waveguide 2.
  • the location of the waveguides 2 as well as that of the radiators 3 are chosen so that the coupling between the different magnetrons can be done without losses. In this way, not only is the presence of insulators and circulators avoided, but also the efficiency is significantly increased.
  • the position and distribution of the radiators 3 above the middle compartment 12 are determined in such a way that the interaction between the magnetrons is practically eliminated.
  • a 36 kW microwave oven project (18 x 2 1 kW magnetrons) working at the frequency of 2450 MHz and used for drying plasticized paper, has seventy-two radiators spread over ten - eight rows of four with a spacing of approximately twenty-five centimeters between rows, the radiators in each row being spaced from each other by approximately fifteen centimeters.
  • the external compartments 11 and 13 are put under a variable air pressure by separate fans 9. Thus not only the cooling heat of the magnetrons but also that of the transformers are used in the enclosure of the compartment 12.
  • the evacuation is via outputs 5.
  • a conveyor belt 6 made of a flexible and non-absorbent material, for example polyethylene, which passes through the middle compartment 12 for transporting the product to be treated.
  • a flexible and non-absorbent material for example polyethylene

Abstract

1. An industrial microwave oven, characterized by comprising at least one module (10) constituted by a metal casing (1) subdivided into three compartments (11, 12, 13) by partitions (14, 15) having openings therein, a plurality of microwave generators (4) arranged in the outer compartments (11, 13) such that the warm air flows directly through said openings (16, 17) in the partitions (14, 15) into the middle compartment (12), said middle compartment (12) forming the microwave applicator oven itself, and a plurality of waveguide means (2) arranged on the metal casing (1) with radiator means (3), the positions of said waveguide and radiator means being distributed so as to couple the maximum microwave energy into the middle compartment (12).

Description

La présente invention concerne un four industriel modulaire à micro-ondes destiné au séchage ou au traitement thermique de produits par micro-ondes. L'invention vise un appareil à fonctionnement continu qui par sa structure modulaire, convient pour la plupart des utilisations d'énergie industrielles allant de 10 à plusieurs centaines de kilowatts.The present invention relates to a modular industrial microwave oven for drying or heat treatment of products by microwave. The invention relates to a continuously operating device which, by its modular structure, is suitable for most industrial energy uses ranging from 10 to several hundred kilowatts.

Le traitement de produits par micro-ondes est certes déjà connu. A cet effet, on utilise habituellement une installation (fig. 1) comprenant un générateur micro-ondes et un applicateur de micro-ondes dans lequel est traité le produit, le générateur et l'applicateur étant couplés entre eux par l'intermédiaire d'un isolateur et de pièces de transfert passives. Une telle installation a les inconvénients suivants :

  • a) elle utilise de coûteux générateurs de grande puissance, qui doivent être protégés au moyen de circulateurs micro-ondes très coûteux,
  • b) le rendement est généralement très bas par suite de l'énergie micro-ondes renvoyée. L'invention a pour but un four qui présente les particularités suivantes :
  • a) un rendement élevé jusqu'à 80 % à partir du réseau de distribution d'énergie,
  • b) un fonctionnement continu et discontinu,
  • c) une précision élevée et une grande souplesse de réglage d'énergie,
  • d) une construction modulaire,
  • e) une économie de construction.
The treatment of products by microwaves is certainly already known. For this purpose, an installation is usually used (fig. 1) comprising a microwave generator and a microwave applicator in which the product is treated, the generator and the applicator being coupled together by means of an isolator and passive transfer parts. Such an installation has the following drawbacks:
  • a) it uses expensive high-power generators, which must be protected by means of very expensive microwave circulators,
  • b) the efficiency is generally very low due to the microwave energy returned. The object of the invention is an oven which has the following features:
  • a) high efficiency up to 80% from the energy distribution network,
  • b) continuous and discontinuous operation,
  • c) high precision and great flexibility of energy adjustment,
  • d) modular construction,
  • e) a building economy.

Ce but est atteint selon l'invention par un four à micro-ondes qui se caractérise par au moins un module constitué d'un caisson métallique divisé en trois compartiments par des cloisons présentant des ouvertures, par plusieurs générateurs micro-ondes, par exemple 25 à 50 magnétrons de faible puissance, ces générateurs étant disposés dans les compartiments extérieurs de telle manière que l'air chaud se propage directement dans le compartiment médian par lesdites ouvertures dans les cloisons, le compartiment médian constituant le four applicateur proprement dit. Plusieurs guides d'ondes sont montés sur le caisson métallique avec des radiateurs en sorte que le maximum d'énergie micro-ondes soit appliqué dans le compartiment médian.This object is achieved according to the invention by a microwave oven which is characterized by at least one module consisting of a metal box divided into three compartments by partitions having openings, by several microwave generators, for example 25 at 50 low power magnetrons, these generators being arranged in the external compartments such that the hot air is propagated directly in the median compartment by said openings in the partitions, the median compartment constituting the applicator oven proper. Several waveguides are mounted on the metal box with radiators so that the maximum amount of microwave energy is applied in the middle compartment.

D'autres particularités du four selon l'invention apparaîtront à la lecture de l'exposé qui suit avec référence aux dessins ci-annexés dans lesquels : la fig. 1 illustre schématiquement une installation micro-ondes courante ; la fig. 2 est une vue en perspective d'un mode d'exécution d'un module à micro-ondes selon l'invention ; la fig. 3 est une vue en coupe schématique du mode d'exécution de la fig. 2.Other features of the oven according to the invention will appear on reading the following description with reference to the accompanying drawings in which: FIG. 1 schematically illustrates a common microwave installation; fig. 2 is a perspective view of an embodiment of a microwave module according to the invention; fig. 3 is a schematic sectional view of the embodiment of FIG. 2.

Pour illustrer l'état de la technique, la fig. 1 montre la constitution d'une installation industrielle usuelle à micro-ondes. La référence 1 désigne un générateur micro-ondes qui se trouve relié par un isolateur 2 et une pièce de transfert passive 3, par exemple un circulateur, à un applicateur de micro-ondes 4 dans lequel se place le produit à traiter.To illustrate the state of the art, fig. 1 shows the construction of a usual industrial microwave installation. The reference 1 designates a microwave generator which is connected by an isolator 2 and a passive transfer part 3, for example a circulator, to a microwave applicator 4 in which the product to be treated is placed.

Les fig. 2 et 3 montrent une unité modulaire selon l'invention. Cette unité 10 comporte essentiellement un caisson métallique 1 divisé en trois compartiments 11, 12 et 13 par des cloisons 14 et 15. Les compartiments extérieurs 11 et 13 contiennent les unités de puissance dont un groupe de générateurs de micro-ondes ou magnétrons 4 et les transformateurs d'alimentation 8 ; le compartiment médian 12 forme l'applicateur proprement dit dans lequel est traité le produit. Les cloisons 14 et 15 entre les compartiments présentent des ouvertures, 16 et 17 respectivement.Figs. 2 and 3 show a modular unit according to the invention. This unit 10 essentially comprises a metal box 1 divided into three compartments 11, 12 and 13 by partitions 14 and 15. The external compartments 11 and 13 contain the power units including a group of microwave or magnetron generators 4 and the power transformers 8; the middle compartment 12 forms the actual applicator in which the product is treated. The partitions 14 and 15 between the compartments have openings, 16 and 17 respectively.

Les magnétrons 4 sont disposés par rapport à ces ouvertures 16 et 17 de telle manière que l'air chaud provenant du refroidissement des magnétrons, se propage directement dans le compartiment applicateur 12. Les ouvertures 16 et 17 sont chacune garnies d'un grillage 18.The magnetrons 4 are arranged relative to these openings 16 and 17 in such a way that the hot air coming from the cooling of the magnetrons is propagated directly in the applicator compartment 12. The openings 16 and 17 are each provided with a screen 18.

Au-dessus du caisson 1 sont montés un certain nombre de guides d'ondes 2. L'énergie micro-ondes des magnétrons se trouve appliquée dans le compartiment 12 au moyen de radiateurs 3 qui sont uniformément répartis le long de chaque guide d'ondes 2. L'emplacement des guides d'ondes 2 ainsi que celui des radiateurs 3 sont choisis en sorte que le couplage entre les différents magnétrons puisse se faire sans pertes. De cette façon, non seulement on évite la présence d'isolateurs et de circulateurs, mais également le rendement se trouve-t-il sensiblement augmenté. La position et la répartition des radiateurs 3 au-dessus du compartiment médian 12 sont déterminées de telle façon que l'interaction entre les magnétrons soit pratiquement éliminée.Above the box 1 are mounted a number of waveguides 2. The microwave energy of the magnetrons is applied in the compartment 12 by means of radiators 3 which are uniformly distributed along each waveguide 2. The location of the waveguides 2 as well as that of the radiators 3 are chosen so that the coupling between the different magnetrons can be done without losses. In this way, not only is the presence of insulators and circulators avoided, but also the efficiency is significantly increased. The position and distribution of the radiators 3 above the middle compartment 12 are determined in such a way that the interaction between the magnetrons is practically eliminated.

A titre d'exemple, dans un projet de four à micro-ondes de 36 kW (18 x 2 magnétrons de 1 kW) travaillant à la fréquence de 2450 MHz et servant au séchage de papier plastifié, comporte soixante-douze radiateurs répartis sur dix-huit rangées de quatre avec un écartement d'environ vingt-cinq centimètres entre rangées, les radiateurs de chaque rangée étant écartés l'un de l'autre d'environ quinze centimètres.For example, in a 36 kW microwave oven project (18 x 2 1 kW magnetrons) working at the frequency of 2450 MHz and used for drying plasticized paper, has seventy-two radiators spread over ten - eight rows of four with a spacing of approximately twenty-five centimeters between rows, the radiators in each row being spaced from each other by approximately fifteen centimeters.

Les compartiments extérieurs 11 et 13 sont mis sous une pression d'air variable par des ventilateurs séparés 9. Ainsi non seulement la chaleur de refroidissement des magnétrons mais également celle des transformateurs se trouvent-elles utilisées dans l'enceinte du compartiment 12. L'évacuation se fait par les sorties 5.The external compartments 11 and 13 are put under a variable air pressure by separate fans 9. Thus not only the cooling heat of the magnetrons but also that of the transformers are used in the enclosure of the compartment 12. The evacuation is via outputs 5.

Dans la forme de réalisation illustrée sur les dessins ci-annexés on voit encore une bande transporteuse 6 constituée d'un matériau souple et non absorbant, par exemple du polyéthylène, qui traverse le compartiment médian 12 pour le transport du produit à traiter. Ainsi un fonctionnement continu se trouve-t-il assuré.In the embodiment illustrated in the accompanying drawings there is also seen a conveyor belt 6 made of a flexible and non-absorbent material, for example polyethylene, which passes through the middle compartment 12 for transporting the product to be treated. Thus continuous operation is ensured.

La structure modulaire décrite dans ce qui précède permet de réaliser des installations de n'importe quelle puissance en juxtaposant simplement le nombre voulu de modules selon l'invention.The modular structure described in the foregoing allows for installation of any power by simply juxtaposing the desired number of modules according to the invention.

Claims (2)

1. An industrial microwave oven, characterized by comprising at least one module (10) constituted by a metal casing (1) subdivided into three compartments (11, 12, 13) by partitions (14, 15) having openings therein, a plurality of microwave generators (4) arranged in the outer compartments (11, 13) such that the warm air flows directly through said openings (16, 17) in the partitions (14, 15) into the middle compartment (12), said middle compartment (12) forming the microwave applicator oven itself, and a plurality of waveguide means (2) arranged on the metal casing (1) with radiator means (3), the positions of said waveguide and radiator means being distributed so as to couple the maximum microwave energy into the middle compartment (12).
2. A microwave oven according to claim 1, characterized by including at least one conveyer belt (6) for carrying the product to be treated through the middle compartment (12), the inlet and outlet passages of said middle compartment being preferably equipped with stop filters (7).
EP82870033A 1981-06-29 1982-06-18 Industrial modular microwave oven Expired EP0069105B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82870033T ATE19334T1 (en) 1981-06-29 1982-06-18 MODULAR INDUSTRIAL MICROWAVE OVEN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8103118A NL8103118A (en) 1981-06-29 1981-06-29 MODULAR INDUSTRIAL MICROWAVE OVEN FOR THERMAL TREATMENT OF SUBSTANCES.
NL8103118 1981-06-29

Publications (2)

Publication Number Publication Date
EP0069105A1 EP0069105A1 (en) 1983-01-05
EP0069105B1 true EP0069105B1 (en) 1986-04-16

Family

ID=19837709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82870033A Expired EP0069105B1 (en) 1981-06-29 1982-06-18 Industrial modular microwave oven

Country Status (9)

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EP (1) EP0069105B1 (en)
AT (1) ATE19334T1 (en)
CA (1) CA1190605A (en)
DE (1) DE3270591D1 (en)
ES (1) ES8305176A1 (en)
GR (1) GR75434B (en)
IE (1) IE52949B1 (en)
NL (1) NL8103118A (en)
PT (1) PT75071B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT390734B (en) * 1987-04-14 1990-06-25 Katschnig Helmut DEVICE FOR KILLING OR DISABLING EGG WHITE NUCLEIC ACID ORGANISMS
DE3926363A1 (en) * 1989-08-10 1991-02-14 Reinhard Schulze METHOD AND DEVICE FOR THE HEAT TREATMENT OF MIXTURE ORGANIC SUBSTANCES AND RELATED APPLICATION
DE4001220A1 (en) * 1990-01-17 1991-07-18 Reinhard Schulze Microwave chamber - has internal atmosphere regulated by through-flow device provided with inlet and outlet gas connections in walls of chamber
FR2885003B1 (en) * 2005-04-22 2007-06-29 Premark Feg Llc MICROWAVE OVEN WITH COOLING AIR DUCT
ES2342958B2 (en) * 2008-09-03 2011-07-04 Emite Ingenieria Slne ANALYZER OF MULTIPLE INPUTS AND MULTIPLE OUTPUTS.

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127495A (en) * 1961-09-05 1964-03-31 Studebaker Corp Microwave oven
CH426051A (en) * 1965-10-25 1966-12-15 Patelhold Patentverwertung Microwave treatment tunnel
FR2076405A5 (en) * 1970-01-14 1971-10-15 Materiel Telephonique
US3654417A (en) * 1970-10-30 1972-04-04 Litton Precision Prod Inc Microwave oven including air flow system
JPS52587B2 (en) * 1972-04-11 1977-01-08
FR2227230A1 (en) * 1973-04-27 1974-11-22 Mauviel Michel Drying of sludge and town refuse - is effected by high frequency waves without incineration
FR2327700A1 (en) * 1975-10-09 1977-05-06 Meisel Nicolas MICROWAVE TUNNEL OVEN FOR CONTINUOUS PROCESSING OF FOOD PRODUCTS
FR2428369A1 (en) * 1978-06-08 1980-01-04 Cim Lambda Int Sarl Microwave heat treatment - maintaining excess pressure in resonator cavities against workpiece tunnel
GB2054330A (en) * 1979-07-17 1981-02-11 Unicorn Ind Ltd Microwave heat treatment apparatus

Also Published As

Publication number Publication date
DE3270591D1 (en) 1986-05-22
GR75434B (en) 1984-07-17
PT75071A (en) 1982-07-01
IE52949B1 (en) 1988-04-13
IE821545L (en) 1982-12-29
ES513491A0 (en) 1983-03-16
ES8305176A1 (en) 1983-03-16
ATE19334T1 (en) 1986-05-15
CA1190605A (en) 1985-07-16
EP0069105A1 (en) 1983-01-05
PT75071B (en) 1984-01-04
NL8103118A (en) 1983-01-17

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