EP0851712B1 - Ofen zur Hochtemperatur-Wärmebehandlung - Google Patents
Ofen zur Hochtemperatur-Wärmebehandlung Download PDFInfo
- Publication number
- EP0851712B1 EP0851712B1 EP97119140A EP97119140A EP0851712B1 EP 0851712 B1 EP0851712 B1 EP 0851712B1 EP 97119140 A EP97119140 A EP 97119140A EP 97119140 A EP97119140 A EP 97119140A EP 0851712 B1 EP0851712 B1 EP 0851712B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oven
- microwave
- microwaveguides
- oven according
- slotted hollow
- 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
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
- F27D2099/0028—Microwave heating
-
- 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 furnace for high-temperature heat treatment of inorganic materials, in particular ceramic materials, according to the preamble of claim 1.
- EP 0 457 948 B1 is a microwave device with one acting as a resonator, with several metallic Chamber walls formed Mehrmodensch into which a to be heated Workpiece is inserted and into the microwave energy is fed, known.
- the chamber points here at least one movably executed chamber wall, and there are means which cause the mobile one to move Chamber wall during operation of the microwave device is displaceable in a repetitive motion. Further are Means for high frequency sealing of the movable chamber wall present against the solid chamber walls, so that upon movement of the movable chamber wall, a change in the Resonator volume is given.
- DE-B 11 86 570 discloses a microwave device, which is not a multimode resonator for receiving a Workpiece has, but a slot radiator, on the a workpiece to be heated is passed.
- a slot radiator On the a workpiece to be heated is passed.
- the Slot radiator is the outlet opening of a waveguide, into which a magnetron feeds.
- a movable Short shifter provided in the waveguide.
- From US-A-5 420 401 is a furnace for high temperature heat treatment with the characteristics of the generic term of the Claim 1 known.
- a metallic lining which takes the form of a has relatively short cylinder section.
- the microwave conductor extend in the radial direction
- This metallic lining obviously surrounds and surrounds also openings in this lining that are not are described and illustrated. They are in cross section formed approximately square and thus encompass a approximately square opening.
- the present invention is based on the object to provide a furnace of the generic type, with the in a simple structure, easy maintenance and a safe operation particularly high temperatures achieve as homogeneous as possible energy density to let.
- the inventive solution includes the arrangement of a Plurality of microwave slot waveguides at least two Walls, so that the desired homogeneous energy density distribution can be achieved.
- microwave permeable thermal Insulation layer in the present invention firmly in Furnace is installed and not on the material to be treated itself is located.
- the thermal insulation layer consists of ceramic fiber materials. It is expediently constructed from plates or long fiber modules.
- the ceramic material for the insulating layer consists of aluminum oxide (Al 2 O 3 ) containing mullite, ie an aluminum silicate consisting of approximately 80% aluminum oxide and 20% silicon dioxide. This material has a bulk density of about 300-700 kg / m 3 .
- vacuum-formed plates are used, which have a thickness of 40mm.
- At least two furnace walls each a plurality of microwave slot waveguides are provided. So the stove has at least two walls several parallel and spaced from each other Microwave slot waveguide. Conveniently, are more perpendicular to at least one side wall arranged microwave slot waveguide available.
- An embodiment has proved to be particularly useful in which the Top wall and the two side walls of the oven with microwave slot waveguides are provided.
- this embodiment have the front and back and bottom of the oven does not have microwave slot waveguides.
- microwave slot waveguides disposed on opposite walls are expediently offset from one another arranged. This will be a mutual influence avoided by opposite slot waveguides.
- the opening associated with the microwave slot waveguide the metallic lining is preferably with a dielectric Material sealed. This can be the Oven inside gastight designed.
- the microwave energy input into the microwave slot waveguide takes place in a known manner via a magnetron, disposed at one end of the microwave slot waveguide is.
- the opposite end of the microwave slot waveguide preferably has a shorting slide on.
- the microwave slot waveguides themselves may be of conventional Be type.
- the slots parallel to the longitudinal axis of the waveguide to both Sides of the central axis of the same offset from each other be.
- the Slots can be arranged at an angle to the longitudinal central axis.
- the slots are along the center longitudinal axis arranged at a distance and point adjacent to each a small hole on.
- the slots are located in a wall of the waveguide, which has approximately rectangular shape in cross section. It understands itself, that this wall associated with the furnace interior is.
- the proposed thermal insulation layer is with relatively short distance from the microwave slot waveguides arranged so that between the slot surface of Waveguide or the metallic lining and the outside the thermal insulation layer only a relatively narrow Gap remains.
- microwave slot waveguides so attached to the outside of the metallic lining are that results in a microwave-tight connection.
- the gas-tightness is by the above-mentioned Layer of dielectric material, preferably quartz glass, scored towards the furnace center in front of the slot surface the waveguide is arranged.
- the furnace shown in the figures for high-temperature heat treatment It is about ceramic materials around a chamber furnace 1, the one at its front Door 2 has.
- the oven is approximately box-shaped and stands on four legs 3.
- At its two opposite Sidewalls 5 are three perpendicular and parallel arranged microwave waveguide to each other 7, wherein the waveguide offset the opposite sides are arranged to each other.
- On the top 4 of the Furnace are two microwave slot waveguide 8, parallel to the longitudinal axis of the furnace and parallel to each other are arranged.
- In the door 2 is an insulation layer 6. The exact structure of the furnace is based Figures 2 - 5 explained.
- the chamber furnace 1 shown here is for a maximum temperature designed from 1.800 ° C and for operation in Air or in natural gas suitable.
- the useful dimensions of the furnace are 500x500x500mm, and it comes with a microwave frequency worked from 2.45 GHz.
- Figure 2 shows that three Microwave slot waveguide 7 parallel to each other in the vertical direction arranged on a side surface 5 of the furnace are. On the opposite side surface are another three microwave slot waveguides that are offset the waveguides of the other side are arranged.
- a magnetron 10 which generates microwave energy and in the associated Waveguide feeds end.
- a short-circuiting slider is provided.
- FIG. 5 shows a horizontal section through the chamber furnace of Figures 1 - 4.
- the oven has an outer frame 14, which stores the actual furnace housing.
- the furnace housing has a metallic lining 12 and an inside from this built-in thermal insulation layer 11th on, which consists of mullite.
- the metallic lining is microwave tight, while the thermal insulation layer 11 is substantially microwave transparent.
- the attachment of the Waveguide 7 on the metallic lining 12 is in microwave sealing Way done.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Furnace Details (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
- Figur 1
- eine räumliche schematische Ansicht eines Ofens zur Hochtemperatur-Wärmebehandlung;
- Figur 2
- eine Seitenansicht des Ofens der Figur 1, wobei die Energieerzeugungseinrichtungen dargestellt sind;
- Figur 3
- eine Vorderansicht des Ofens der Figur 1 mit dargestellten Energieerzeugungseinrichtungen;
- Figur 4
- eine Draufsicht auf den Ofen der Figur 1 mit dargestellten Energieerzeugungseinrichtungen; und
- Figur 5
- einen schematischen Horizontalschnitt durch den Ofen der Figur 1.
Claims (9)
- Ofen (1) zur Hochtemperatur-Wärmebehandlung von anorganischen Werkstoffen, insbesondere keramischen Werkstoffen, mit einem Ofengehäuse zur Aufnahme des zu behandelnden Werkstoffes, einer Tür (2), einer Mikrowellenenergieerzeugungseinrichtung und einer Einrichtung zur Abstrahlung der Mikrowellenenergie in das Ofeninnere, wobei das Ofengehäuse eine mikrowellendichte metallische Auskleidung (12) und im Inneren hiervon eine fest eingebaute mikrowellendurchlässige thermische Isolationsschicht (11) aufweist und die Mikrowellenenergieabstrahlungseinrichtung durch mehrere parallel zueinander und im Abstand voneinander angeordnete Mikrowellenleiter gebildet ist, deren Wandung eine Öffnung in der metallischen Auskleidung (12) umgreift,
dadurch gekennzeichnet, daß
der Ofen (1) Kastenform besitzt und an mindestens zwei Wänden (4, 5) jeweils mehrere Mikrowellenleiter aufweist,
die Mikrowellenleiter als sich parallel zur Wandebene und nahezu über die gesamte Ofenwand erstreckende Mikrowellenschlitzhohlleiter (7, 8) ausgebildet sind, deren Wandungen eine längliche Öffnung (13) der metallischen Auskleidung (12) umgreifend an deren Außenseite mit der Schlitzfläche zum Ofeninneren weisend angeordnet sind, und
die thermische Isolationsschicht (11) mit relativ geringem Abstand von der metallischen Auskleidung (12) angeordnet ist. - Ofen nach Anspruch 1, dadurch gekennzeichnet, daß die thermische Isolationsschicht (11) aus keramischen Faserwerkstoffen besteht.
- Ofen nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die thermische Isolationsschicht (11) aus Platten oder Langfasermodulen besteht.
- Ofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die thermische Isolationsschicht (11) aus aluminiumsilikathaltigem, insbesondere mullithaltigem Aluminiumoxid besteht.
- Ofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß er an mindestens einer Seitenwand (5) mehrere senkrecht angeordnete Mikrowellenschlitzhohlleiter (7) aufweist.
- Ofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß seine Deckwand (4) und seine beiden Seitenwände (5) mit Mikrowellenschlitzhohlleitern (7, 8) versehen sind.
- Ofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die dem Mikrowellenschlitzhohlleiter (7, 8) zugeordnete Öffnung (13) der metallischen Auskleidung (12) mit einem dielektrischen Material verschlossen ist.
- Ofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß an gegenüberliegenden Wänden (5) angeordnete Mikrowellenschlitzhohlleiter (7) versetzt zueinander angeordnet sind.
- Ofen nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß jedem Mikrowellenschlitzhohlleiter (7, 8) an einem Ende ein in diesen einspeisendes Magnetron (10) zugeordnet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19654356A DE19654356C2 (de) | 1996-12-24 | 1996-12-24 | Ofen zur Hochtemperatur-Wärmebehandlung |
DE19654356 | 1996-12-24 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0851712A2 EP0851712A2 (de) | 1998-07-01 |
EP0851712A3 EP0851712A3 (de) | 1998-09-16 |
EP0851712B1 true EP0851712B1 (de) | 2005-01-26 |
Family
ID=7816209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97119140A Expired - Lifetime EP0851712B1 (de) | 1996-12-24 | 1997-11-03 | Ofen zur Hochtemperatur-Wärmebehandlung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0851712B1 (de) |
AT (1) | ATE288181T1 (de) |
DE (2) | DE19654356C2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10158507B4 (de) * | 2001-11-29 | 2007-10-18 | Thyssenkrupp Gerlach Gmbh | Schutzvorrichtung für eine Induktionsspule und Verfahren zu ihrer Herstellung |
EP2101547B1 (de) * | 2008-03-11 | 2014-03-05 | Vita Zahnfabrik H. Rauter GmbH & Co. KG | Dental-Sinterofen sowie Verfahren zum Sintern keramischer Dental-Elemente |
DE102014208110B4 (de) * | 2014-04-29 | 2016-09-08 | Schunk Kohlenstofftechnik Gmbh | Ofenauskleidung |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1378280A (fr) * | 1963-10-04 | 1964-11-13 | Procédé et dispositif d'excitation d'un four de chauffage à ondes d'hyperfréquence | |
SE345903B (de) * | 1970-12-21 | 1972-06-12 | Philips Svenska Ab | |
US4541729A (en) * | 1982-01-11 | 1985-09-17 | General Motors Corporation | Microwave heating control and calorimetric analysis |
FR2571201B1 (fr) * | 1984-10-02 | 1987-01-02 | Valeo | Procede de chauffage dans la masse d'une substance par exemple en vue d'une vulcanisation ou d'une polymerisation |
DE3706336C1 (de) * | 1987-02-27 | 1988-04-28 | Linn Horst | Verfahren und Vorrichtung zur Erzeugung hoher Temperaturen |
DE3818490A1 (de) * | 1988-05-31 | 1989-12-07 | Bosch Siemens Hausgeraete | Mikrowellen-haushaltgeraet |
FR2704942B1 (fr) * | 1993-05-03 | 1995-08-04 | Prolabo Sa | Four micro-ondes en particulier pour chauffage rapide a haute temperature. |
DE4324635A1 (de) * | 1993-07-22 | 1995-01-26 | Abb Patent Gmbh | Einrichtung zur Sinterung keramischer Körper mittels Mikrowellen |
AU6020996A (en) * | 1995-06-03 | 1996-12-24 | Miratron Ag | Microwave oven |
-
1996
- 1996-12-24 DE DE19654356A patent/DE19654356C2/de not_active Expired - Fee Related
-
1997
- 1997-11-03 AT AT97119140T patent/ATE288181T1/de not_active IP Right Cessation
- 1997-11-03 EP EP97119140A patent/EP0851712B1/de not_active Expired - Lifetime
- 1997-11-03 DE DE59712184T patent/DE59712184D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0851712A3 (de) | 1998-09-16 |
ATE288181T1 (de) | 2005-02-15 |
EP0851712A2 (de) | 1998-07-01 |
DE19654356A1 (de) | 1998-06-25 |
DE19654356C2 (de) | 2002-06-13 |
DE59712184D1 (de) | 2005-03-03 |
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