EP0097252B1 - Moufle de four à avance continue ou par a-coups - Google Patents

Moufle de four à avance continue ou par a-coups Download PDF

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Publication number
EP0097252B1
EP0097252B1 EP83105009A EP83105009A EP0097252B1 EP 0097252 B1 EP0097252 B1 EP 0097252B1 EP 83105009 A EP83105009 A EP 83105009A EP 83105009 A EP83105009 A EP 83105009A EP 0097252 B1 EP0097252 B1 EP 0097252B1
Authority
EP
European Patent Office
Prior art keywords
muffle
distinguished
internal body
accordance
shell 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
Application number
EP83105009A
Other languages
German (de)
English (en)
Other versions
EP0097252A1 (fr
Inventor
Herbert Cremer
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.)
Cremer Thermoprozessanlagen GmbH
Original Assignee
Cremer Thermoprozessanlagen GmbH
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 Cremer Thermoprozessanlagen GmbH filed Critical Cremer Thermoprozessanlagen GmbH
Priority to AT83105009T priority Critical patent/ATE16849T1/de
Publication of EP0097252A1 publication Critical patent/EP0097252A1/fr
Application granted granted Critical
Publication of EP0097252B1 publication Critical patent/EP0097252B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0043—Muffle furnaces; Retort furnaces
    • 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
    • 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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B5/10—Muffles
    • 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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/08—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated through chamber walls
    • F27B9/082—Muffle furnaces
    • F27B9/084—Muffle furnaces the muffle being fixed and in a single piece
    • 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
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/02—Ohmic resistance heating

Definitions

  • the invention relates to a muffle for furnaces operating in a continuous or impact process for the heat treatment of materials under protective gas with an elongated, heat-resistant jacket provided with an opening at least at one end.
  • the material to be subjected to heat treatment under protective gas can e.g. B. be continuously moved through the muffle by means of a conveyor belt.
  • a muffle open at both ends is required for this.
  • the conveyor belt lies on the bottom of the muffle, or it is guided by an intermediate layer provided in the muffle.
  • muffles can also be used in burst operation, the material to be treated being introduced into the muffle from one end in steel or graphite glow boxes or on ceramic pusher plates and removed to the other end after the required treatment time.
  • These molds can also be used in chamber furnaces with only one opening.
  • Muffles are already known which are cast from heat-resistant metal alloys or made from corresponding metal sheets. Since such muffles are subjected to temperatures of up to approximately 1150 ° C., the durability of such metal muffles is limited. Such muffles have the advantage, however, that they can be made gas-tight with the exception of the ends required for introducing or discharging the material to be treated.
  • Muffles made of ceramic material are also known. Such a material withstands the thermal stress that occurs much better than a metallic muffle.
  • it is disadvantageous for a muffle made of ceramic material that it cannot be made gas-tight, in particular not if it is e.g. B. must be assembled from several parts due to the required dimensions, so that transverse to the longitudinal direction or other joints result.
  • the object of the present invention is to create a muffle of the type mentioned at the outset, which combines the advantageous features of the metal muffle with those of the muffle made of ceramic material.
  • the invention provides that the jacket has an inner body made of ceramic material, which is enclosed by a shell made of sheet steel.
  • the high heat resistance of ceramic material for the inner body is combined with the gas tightness of steel sheet in an advantageous manner, so that a muffle results which is characterized by long durability and high gas tightness. Only a small wall thickness is required for the sheet steel jacket.
  • the muffle can be designed such that the shell surrounding the inner body is welded in a gas-tight manner.
  • the muffle can be designed such that the inner body is composed of pieces that follow one another in the axial direction. According to this proposal, muffle constructions of almost any length can be realized without further notice.
  • the muffle can be designed so that the inner body consists of one piece in its cross section. Such a structure of the muffle is particularly indicated when its width is relatively small.
  • the muffle can be designed such that the cross section of the inner body is composed of at least two pieces.
  • Such a design means that the inner body can be assembled from simple ceramic elements even with a relatively wide muffle, without the course and number of joints being able to impair the gas-tightness of the entire muffle.
  • the continuous furnace 1 shown in FIG. 1 has a heating chamber 2.
  • a muffle 3 is arranged in this heating chamber, which has a flat tubular cross section. It has a horizontal bottom surface 4, which is adjoined on both sides by substantially perpendicular upward side walls 5. These in turn are followed by slightly roof-shaped sloping ceiling walls 6.
  • the muffle 3 shown in Fig. 2 has an inner body 7, which consists of ceramic material.
  • This inner body is formed in its cross section from a bottom section 8 and two roof sections 9. Sections 8 and 9 abut one another, wherein a profile can be provided in the area of butt joints 10 and 11 in order to ensure reliable interlocking.
  • the inner body 7 is enclosed by a shell 8, which consists of sheet steel.
  • a shell 8 which consists of sheet steel.
  • the side edges of the sheet metal blank used to produce the casing 8, which run along the muffle, are connected to one another via a fold 12. In this area, the edges are welded together in order to create gas tightness.
  • the dashed line 13 is intended to indicate that the Sections 8 and 9 of the inner body 7 of the muffle 3 can also be composed of a plurality of pieces joined together in the longitudinal direction of the muffle, the denomination and the course of the separating joints being able to be selected according to the respective requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Tunnel Furnaces (AREA)

Claims (5)

1. Moufle pour fourneaux travaillant en continu et en poussées prévu pour le traitement thermique de matériaux sous gaz protecteur avec une enveloppe réfractaire allongée munie d'une ouverture à une extrémité au moins, caractérisé en ce que l'enveloppe présente un corps intérieur (7) en matière céramique enveloppé d'une gaine (8) en tôle d'acier.
2. Moufle selon la revendication 1, caractérisé en ce que la gaine qui enveloppe le corps intérieur (7) est soudée de façon étanche aux gaz.
3. Moufle selon la revendication 1 ou 2, caractérisé en ce que le corps intérieur (7) est constitué de pièces qui se succèdent dans le sens axial.
4. Moufle selon les revendications 1 à 3, caractérisé en ce que le corps intérieur (7) est fait d'une pièce dans sa coupe.
5. Moufle selon les revendications 1 à 3, caractérisé en ce que le corps intérieur (7) est composé d'au moins deux pièces dans sa coupe.
EP83105009A 1982-05-27 1983-05-20 Moufle de four à avance continue ou par a-coups Expired EP0097252B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83105009T ATE16849T1 (de) 1982-05-27 1983-05-20 Muffel fuer im durchlauf- oder stossverfahren arbeitende oefen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3219909A DE3219909C2 (de) 1982-05-27 1982-05-27 Muffel für im Durchlauf- oder Stoßverfahren arbeitende Öfen
DE3219909 1982-05-27

Publications (2)

Publication Number Publication Date
EP0097252A1 EP0097252A1 (fr) 1984-01-04
EP0097252B1 true EP0097252B1 (fr) 1985-12-04

Family

ID=6164604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83105009A Expired EP0097252B1 (fr) 1982-05-27 1983-05-20 Moufle de four à avance continue ou par a-coups

Country Status (3)

Country Link
EP (1) EP0097252B1 (fr)
AT (1) ATE16849T1 (fr)
DE (1) DE3219909C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998052104A1 (fr) * 1997-05-13 1998-11-19 Laboratoire Pont-Saint-Germain Procede de fabrication d'etampages de boites de montres et produits issus de ce procede
RU2428488C1 (ru) * 2010-01-26 2011-09-10 Михаил Васильевич Пилягин Способ безокислительного нагрева термообрабатываемых металлических изделий в воздушной среде в муфеле и устройство для его осуществления

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1355189A (fr) * 1963-04-17 1964-03-13 Philips Nv Four
DE1261536B (de) * 1965-12-03 1968-02-22 Aichelin Fa J Verfahren zum Spuelen und Atmosphaerenwechsel bei retortenlosen, eine Schutzgasatmosphaere enthaltenden Industrieoefen
US3582054A (en) * 1969-06-04 1971-06-01 Btu Eng Corp Furnace muffle
US4032290A (en) * 1976-05-24 1977-06-28 Btu Engineering Corporation High temperature furnace muffle
GB2072313B (en) * 1980-03-26 1983-08-24 Fhd Furnaces Ltd Muffle furnace
GB2052030B (en) * 1980-04-28 1984-02-08 Gen Electric Construction of special atmosphere furnace

Also Published As

Publication number Publication date
EP0097252A1 (fr) 1984-01-04
ATE16849T1 (de) 1985-12-15
DE3219909C2 (de) 1986-04-03
DE3219909A1 (de) 1983-12-08

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