EP0133847B1 - Reflektor für Infrarot-Strahlungsöfen - Google Patents

Reflektor für Infrarot-Strahlungsöfen Download PDF

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Publication number
EP0133847B1
EP0133847B1 EP84850241A EP84850241A EP0133847B1 EP 0133847 B1 EP0133847 B1 EP 0133847B1 EP 84850241 A EP84850241 A EP 84850241A EP 84850241 A EP84850241 A EP 84850241A EP 0133847 B1 EP0133847 B1 EP 0133847B1
Authority
EP
European Patent Office
Prior art keywords
reflector
tubes
infrared
oven
radiation
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
EP84850241A
Other languages
English (en)
French (fr)
Other versions
EP0133847A3 (en
EP0133847A2 (de
Inventor
Lars Karlsson
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.)
Tri Innovations AB
Original Assignee
Tri Innovations AB
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 Tri Innovations AB filed Critical Tri Innovations AB
Priority to AT84850241T priority Critical patent/ATE34212T1/de
Publication of EP0133847A2 publication Critical patent/EP0133847A2/de
Publication of EP0133847A3 publication Critical patent/EP0133847A3/en
Application granted granted Critical
Publication of EP0133847B1 publication Critical patent/EP0133847B1/de
Expired legal-status Critical Current

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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
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/22—Reflectors for radiation heaters
    • 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
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices

Definitions

  • the present invention refers to a reflector structure for infrared radiation ovens, hereinafter referred to as IR-ovens, intended for heat treatment of objects and incorporating an oven chamber through which objects to be treated are conveyed and which is provided with radiation sources constituted by infrared heating tubes, hereinafter referred to as IR-tubes, and having reflectors provided behind said infrared tubes (see e.g. DE-B-K928 V/82).
  • IR-ovens of this kind are used for a plurality of different heat treatment purposes, such as drying of painted objects, food preparation, hot treatment etcetera.
  • the overall efficiency of the IR-oven is dependent of the combination of IR-tubes and reflector.
  • the oven chamber in which the IR-tubes are located is designed as a reflector room, wherein the secondary radiation from the IR-tubes hits the objects to be treated via the reflectors, and the objects are thus subjected to a maximum of radiation energy.
  • the reflector room is generally built from a high reflecting material such as gold coated or aluminized sheet steel or the like.
  • the reflector surface of the oven chamber is coated by a a burnt-in layer or impurity, the origin and composition of which can vary but which most often consists of dust, powder particles, grease and the like.
  • This coating absorbs an ever bigger part of the radiation energy emitted from the IR-tubes and the efficiency of the IR-oven becomes lower, whereby a large portion of the radiation energy from the IR-tubes are instead used for heating the reflectors.
  • the purpose of the present invention is to provide a reflector structure for IR-ovens of the kind defined in the preamble, which entails that the reflector surfaces of the oven chamber are subjected to a continuous cleaning, whereby the efficiency of the IR-oven will be high and above all even, which will guarantee an even heat treatment result, and this has been achieved in that the reflector structure has been given features defined in the accompanying claims.
  • Figure 1 shows in cross-section a reflector disc 1 provided with retainers 2 for a number of IR-tubes 3 of any proper type.
  • the reflector disc 1 is a self-supporting ceramic fiber plate, preferably based on alumina and which has the property of reflecting the bigger part of the radiation whereas a smaller part thereof is absorbed by the surface of the reflector material.
  • the temperature of the reflector surface thereby will increase rapidly to high values, whereby organic impurities are burnt away from the reflector surface, and the reflector has hereby become a self-cleaning reflector 1.
  • Such a ceramic fibre plate which is available on the market under the trade name TRITON KAOWOOL, as an insulating plate, has unexpectedly proven itself to give the desired effect as a self-cleaning reflector disc, whereby it at the same time has an insulating effect against its side turned away from the reflector.
  • the material which contains 43-47 % AI 2 0 3 and 57-53% Si0 2 has the ability of withstanding temperatures up till 1400°C, i.e. temperatures which are more than sufficient in order to allow contaminations such as dust, paint particles or grease to be incinerated, the reflector disc 1 of this material reflects about 85% of the infrared radiation whereas 15% is absorbed and thereby is used for keeping the reflector clean. It is to be understood that also other similar materials can be used for the same purpose.
  • Figure 2 shows in cross-section corresponding to Fig. 1, a box-shaped unit 4 incorporating an insulating reflector disc 1 with retainers 2 which project from one side surface thereof and carry IR-tubes 3, whereas on the opposite side of the disc is fitted a sheet metal housing, consisting of a sheet metal frame 5 and a covering sheet 6.
  • the housing can contain a not shown discharge blower and it is for this purpose provided with a connecting socket 7.
  • FIG. 3 which shows the box-shaped unit according to Fig. 2 in planar view from the side surface thereof provided with the IR-tubes 3, it can be seen how the retainers 2, which carry the IR-tubes are located one adjacent each end of the different IR-tubes.
  • the unit is also provided with mounting holes 8 for mounting of the unit into an IR-oven.
  • the self-supporting reflector disc according to Fig. 1 can be adapted after the current requirements and it can be mounted in existing oven chambers without the necessity of changing the oven shell in appreciable content.
  • Fig. 4 shows as an example an application of the invention at a powder heat treating oven for melting and setting of plastic material layers applied on objects, e.g. by means of electrostatic coating.
  • the IR-oven incorporates i.a. an oven chamber in two hingedly connected halves 10,11 which are articulated about a shaft arranged to extend in the longitudinal direction of the oven. Each one of the halves being connected to actuators 12 by means of which the oven can be opened such as intimated in dash lines.
  • the oven may alternatively be provided with a laterally hinged openable doors.
  • the two oven halves 10, 11 form an oven space 13 through which objects to be treated are conveyed.
  • the oven space 13 is provided with an internal wall confinement, which in the sloping roof and bottom regions 14 and 15 resp. have through- holes or perforations.
  • the inner vertical walls 16, however, have no perforations, but they are at their walls facing the center of the oven chamber designed as reflectors, which carry a number of IR-tubes 17.
  • the sloping roof and bottom regions 14, 15 can of course be designed as reflectors.
  • the reflector surfaces 16 are designed in the manner described hereabove in connection to Figs. 1, 2 and 3.
  • the surfaces 14, 15 may, if they are formed as reflectors, be made from ceramic fibre material, but the self-cleaning effect can hardly be obtained on these surfaces as the reflector must be arranged rather close to the IR-tube for reaching a sufficiently high temperature.
  • each oven half there is arranged radial blowers 19 for circulation of the oven atmosphere through the perforations in the inner roof 14 of the oven and via ducts 18 between the reflectors 16 and the outer, insulated, vertical oven wall to the bottom of the oven, where the atmosphere again is introduced into the oven chamber through the perforations in the bottom regions 15.
  • the cross-section of the oven chamber is hexagonal, and only the vertical walls are used for supporting the IR-tubes, in order not to risk the tubes being damaged by falling objects.
  • the IR-tubes can alternatively be mounted separately on a supporting structure freestanding from the walls 16, but anyhow adjacent these.
  • the IR-oven may however have any desired shape and it can be adapted for hanging objects or horizontally conveyed objects.
  • figure 5 is schematically shown in IR-unit 5 having a reflector disc 1 fitted to one of its sides and IR-tubes 3 applied thereto, which tubes emitt infrared radiation.
  • the figure also shows a schematically intimated work piece or object 20, which shall be subjected to some kind of heat treatment.
  • the object 20 as seen is subjected to direct radiation 21 as well as secondary radiation 22, which is reflected from the reflector disc 1.
  • Figure 6 is a corresponding view of a reflector disc 1 with an IR-tube whereby the radiation is illustrated as direct radiation 21 against a not shown object, direct radiation 23 against the reflector disc 1, and secondary radiation 22, reflected from the reflection disc 1.
  • direct radiation 23 which hits the reflector disc, with a reflector material of the type described above, about 15 % of the radiation is absorbed by the reflector disc. This energy incinerates the contaminations on the reflector disc 1 and a clean reflector is obtained, which emits about 85% of the energy from the primary radiation 23 as secondary radiation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Microbiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Tunnel Furnaces (AREA)
  • Electric Ovens (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)

Claims (5)

1. Reflektor für Infrarot-Strahlungsöfen zur Wärmebehandlung von Gegenständen, umfassend eine Ofenkammer (13), durch welche die zu behandelnden Gegenstände laufen und die Strahlungsquellen aufweist, die aus Infrarot-Heizröhren (3, 17) bestehen, hinter denen Reflektoren (1, 14,15,16) angeordnet sind, dadurch gekennzeichnet, daß wenigstens die Reflektoroberfläche (1, 16) aus einem keramischen Fasermaterial besteht, das den größten Teil der Strahlung der Infrarot-Heizröhre reflektieren, jedoch einen Teil davon absorbieren kann, um auf den Oberflächen der Reflektoren eine so hohe Temperatur zu erzeugen, die ausreicht, um Fremdkörper auf den Reflektoroberflächen zu Asche zu verbrennen.
2. Reflektor nach Anspruch 1, dadurch gekennzeichnet, daß das Reflektormaterial A1203 enthält.
3. Reflektor nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Reflektormaterial zu 43 bis 47% aus A1203 und zu 57 bis 53% aus Si02 besteht.
4. Reflektor für einen Infrarot-Strahlungsofen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß dieser als selbsttragende Reflektorplatte (1) ausgebildet ist, die Halter (2) für die Aufnahme von Infrarot-Heizröhren (3) aufweist, ohne daß zwischen den Infrarot-Heizröhren und der Reflektorfläche Abschirmungen eingesetzt sind.
5. Reflektor für einen Infrarot-Strahlungsofen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß dieser als kastenförmige Einheit mit einer Reflektorplatte (1) ausgebildet ist, die auf einer ihrer flachen Oberflächen nicht abgeschirmte Halter (2) trägt, die von dieser Oberfläche abstehen und Infrarot-Heizröhren (3) tragen, wobei die kastenförmige Einheit ein Gehäuse (5, 6) aufweist, das an der gegenüberliegenden Seite der Reflektorplatte befestigt ist und zur Aufnahme von Befestigungsmittel (8) sowie von Kühlungs- und/oder Belüftungsmitteln geeignet ist.
EP84850241A 1983-08-11 1984-08-13 Reflektor für Infrarot-Strahlungsöfen Expired EP0133847B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84850241T ATE34212T1 (de) 1983-08-11 1984-08-13 Reflektor fuer infrarot-strahlungsoefen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8304363A SE448575B (sv) 1983-08-11 1983-08-11 Reflektorkonstruktion for ir-ugnar
SE8304363 1983-08-11

Publications (3)

Publication Number Publication Date
EP0133847A2 EP0133847A2 (de) 1985-03-06
EP0133847A3 EP0133847A3 (en) 1986-12-30
EP0133847B1 true EP0133847B1 (de) 1988-05-11

Family

ID=20352168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84850241A Expired EP0133847B1 (de) 1983-08-11 1984-08-13 Reflektor für Infrarot-Strahlungsöfen

Country Status (4)

Country Link
EP (1) EP0133847B1 (de)
AT (1) ATE34212T1 (de)
DE (1) DE3471154D1 (de)
SE (1) SE448575B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10118260A1 (de) * 2001-04-11 2002-10-24 Schott Glas Verfahren und Vorrichtung zum Umformen von Gläsern und/oder Glaskeramiken
DE112004001402B4 (de) * 2003-07-28 2011-07-28 Mattson Technology Inc., Calif. Vorrichtung zum thermischen Behandeln eines Substrats

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271593A1 (de) * 1986-12-16 1988-06-22 Russell R. Ellersick Zusammensetzung für eine Ofenwandauskleidung und deren Verwendung
US5099586A (en) * 1989-09-08 1992-03-31 W. R. Grace & Co.-Conn. Reflector assembly for heating a substrate
US5551670A (en) * 1990-10-16 1996-09-03 Bgk Finishing Systems, Inc. High intensity infrared heat treating apparatus
DE4202944C2 (de) * 1992-02-01 1994-07-14 Heraeus Quarzglas Verfahren und Vorrichtung zum Erwärmen eines Materials
GB9219221D0 (en) * 1992-09-11 1992-10-28 Queen Mary & Westfield College Furnace
IT1283311B1 (it) * 1996-03-27 1998-04-16 Nichilo Giorgio De Forno in particolare per le stazioni di riscaldo nelle macchine di termoformatura e stazione di riscaldo provvista di questo forno
SE507148C2 (sv) * 1996-08-30 1998-04-06 Infraroedteknik Ab Värmningsanordning värmning med infrarödstrålning
SE513409C2 (sv) 1997-07-01 2000-09-11 Kanthal Ab IR-källa som utgörs av ett spiralformat högtemperaturelement, vilket är placerat i en öppen reflektor
CA2368016A1 (en) 1999-03-23 2000-09-28 Carl-Zeiss-Stiftung Trading As Schott Glas Method of forming glass-ceramic parts and/or glass parts
CA2368018A1 (en) 1999-03-23 2000-09-28 Carl-Zeiss-Stiftung Trading As Schott Glas Method and device for the homogeneous heating of glass and/or glass-ceramic articles using infrared radiation
DE10029522B4 (de) * 2000-06-21 2005-12-01 Schott Ag Vorrichtung zum homogenen Erwärmen von Gläsern und/oder Glaskeramiken, Verfahren und Verwendungen
DE10047576A1 (de) * 2000-09-22 2002-04-18 Schott Glas Verfahren zur Formgebung von Glaskeramikteilen und/oder Glasteilen
US6288369B1 (en) * 2000-12-15 2001-09-11 Victor L. Sherman Cooking apparatus
DE102005000837B4 (de) 2005-01-05 2022-03-31 Advanced Photonics Technologies Ag Thermische Bestrahlungsanordnung zur Erwärmung eines Bestrahlungsgutes
DE102006055397B3 (de) * 2006-11-22 2008-05-15 Heraeus Quarzglas Gmbh & Co. Kg Verfahren und Vorrichtung für die Herstellung eines zylinderförmigen Profilelements aus Quarzglas sowie Verwendung desselben
DE102011012363A1 (de) 2011-02-24 2012-08-30 Heraeus Noblelight Gmbh Infrarot-Flächenstrahler mit hoher Strahlungsleistung und Verfahren für seine Herstellung
DE102014107395A1 (de) * 2014-05-26 2015-11-26 Sandvik Materials Technology Deutschland Gmbh Vorrichtung zur Halterung von Strahlungsheizelementen und entsprechende Strahlungsheizvorrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR398210A (fr) * 1908-12-31 1909-05-29 Martin Brandt Appareil de chauffage rapide
DE2840339A1 (de) * 1978-09-15 1980-04-03 Bartholomaeus & Rudolph Gmbh & Trockner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10118260A1 (de) * 2001-04-11 2002-10-24 Schott Glas Verfahren und Vorrichtung zum Umformen von Gläsern und/oder Glaskeramiken
DE112004001402B4 (de) * 2003-07-28 2011-07-28 Mattson Technology Inc., Calif. Vorrichtung zum thermischen Behandeln eines Substrats

Also Published As

Publication number Publication date
SE448575B (sv) 1987-03-02
DE3471154D1 (en) 1988-06-16
EP0133847A3 (en) 1986-12-30
ATE34212T1 (de) 1988-05-15
SE8304363D0 (sv) 1983-08-11
SE8304363L (sv) 1985-02-12
EP0133847A2 (de) 1985-03-06

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