DE509288C - Muffle furnace with fuel and electrical heating - Google Patents

Muffle furnace with fuel and electrical heating

Info

Publication number
DE509288C
DE509288C DEA56767D DEA0056767D DE509288C DE 509288 C DE509288 C DE 509288C DE A56767 D DEA56767 D DE A56767D DE A0056767 D DEA0056767 D DE A0056767D DE 509288 C DE509288 C DE 509288C
Authority
DE
Germany
Prior art keywords
muffle
electrical heating
fuel
furnace
muffle furnace
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
DEA56767D
Other languages
German (de)
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.)
AEG AG
Original Assignee
AEG AG
Publication date
Priority to DEA56767D priority Critical patent/DE509288C/en
Application granted granted Critical
Publication of DE509288C publication Critical patent/DE509288C/en
Expired legal-status Critical Current

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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/66—Supports or mountings for heaters on or in the wall or roof
    • 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 peculiar to furnaces of these types
    • F27B5/14—Arrangements of heating devices
    • 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
    • H05B11/00—Heating by combined application of processes covered by two or more of groups H05B3/00 - H05B7/00

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Description

liluffelofen mit Brennstoff- und elektrischer Beheizung Es ist bereits vorgeschlagen worden, Öfen, die mit Gas oder anderen Brennstoffen befeuert werden, auch mit einer elektrischen Zusatzheizung zu versehen. Bei derartigen Muffelöfen werden zweckmäßig die elektiischen Heizelemente innerhalb der Muffel untergebracht, während die heiß-en Feuer'gase die Muffel von außen umspülen. Die Einführung der elektrischen Zuleitungen, der Temperaturregler und Temperaturmeßgeräte in die Muffel, die gewöhnlich aus kerainischen Werkstoffen, aber auch aus Metall besteht, erfordert eine Reihe von Durchbrüchen durch die Muffelwandung, wodurch diese geschwächt wird und auch leicht Temperaturrisse entstehen.liluffelofen with fuel and electric heating It is already it has been proposed that stoves that are fired with gas or other fuels, also to be provided with an additional electrical heater. With such muffle furnaces the electrical heating elements are expediently housed within the muffle, while the hot fire gases wash around the muffle from the outside. The introduction of the electrical supply lines, the temperature controller and temperature measuring devices in the muffle, which usually consists of Kerainic materials, but also of metal, requires a series of breakthroughs through the muffle wall, weakening it and temperature cracks can also easily develop.

Erfindungsgemäß wird die Lebensdauer der Muffel solcher Öfen dadurch erhöht, daß die Durchführungsrohre für die Zuleitungen zu den elektrischen I-feizeleinenten zugleich als Versteifungskörper ausgebildet sind, die die Muffel gegen das Ofenmauerwerk abstützen. Metallmuffeln können dann d#ünnwandiger gehalten werden, wodurch sich wieder eine leichtere Bewältigung der Wärmespannungen ergibt.According to the invention, the service life of the muffle of such furnaces is thereby increased increases that the lead-through pipes for the supply lines to the electrical I-feizeleinenten are at the same time designed as a stiffening body that the muffle against the furnace masonry prop up. Metal muffles can then be kept thin-walled, creating a again results in easier coping with thermal stresses.

Die Zeichnung zeigt beispielsweise einen Muffelofen gemäß der Erfindung schematisch im Schnitt.The drawing shows, for example, a muffle furnace according to the invention schematically in section.

Der Muffelo-fen i, die Seitenwände:2 und die Muffeldecke 3 bestehen bei der links dargestellten Muffelhälfte aus einem Stück, währeryd die rechte Hälfte der Abbildung eine Muffel zeigt, bei welcher diese Teile gesondert ausgebildet und durch Dichtungen4,5 miteinander verbunden sind, uni Verschiebungen infolge Wärmedehnungen zuzulassen.The muffle furnace i, the side walls: 2 and the muffle cover 3 consist of one piece in the muffle half shown on the left, while the right half of the figure shows a muffle in which these parts are formed separately and connected to one another by seals4,5, uni Allow displacements due to thermal expansion.

Die elektrischen Heizwiderstände 6 sind innerhalb der Muffel an IsollerstÜtZen 7 aufgehängt und die Zuleitunggen 8 durch Rohre 9 geführt, die erfindungsgemäß die Metallmuffel gegen das Außenmauerwerk des Ofens abstützen und versteifen. Diese Rohre sind sowohl mit der Muffel als auch mit dem Außeninauerwerk gas;dicht verbunden. Sie reichen mindestens bis zur inneren Fläche des Ofenmauenverks io, sind jedoch zweckmäßig, wie die Zeichnung zeigt, bis zur Außenseite des Ofenmauerwerks io durchgeführt. Dieses kann noch von einer wärmeisolierenden Schicht ii umgeben sein.The electrical heating resistors 6 are suspended within the muffle on IsollerstÜzen 7 and the supply lines 8 are guided through pipes 9 , which according to the invention support and stiffen the metal muffle against the outer masonry of the furnace. These pipes are gas; tightly connected to both the muffle and the external masonry. They extend at least to the inner surface of the furnace masonry, but are expediently carried out, as the drawing shows, to the outside of the furnace masonry. This can also be surrounded by a heat-insulating layer ii.

Selbstverständlich kann die gleiche Anordnung auch bei keramischen Muffeln gewählt werden, in welchem Falle die Durchführungsrohre 9 mit der Muffel durch f euerfesten Kitt verbunden sind.Of course, the same arrangement can also be chosen in ceramic muffles, in which case the penetration tubes 9 are connected to the muffle through f your firm putty.

Claims (2)

PATENTANSPRÜCHE: i. Mtiffelofen mit Brennstoff- und elektrischer Beheizung, dadurch 1-.okennzeichnet, daß die Durchführungsrohre (9) für die Zuleitunggen (8) zu den elektrischen Heizelementen (6) als Versteifungskörper ausgebildet sind, die die Muffel gegen das Ofenmauerwerk abstützen. PATENT CLAIMS: i. Mtiffelofen with fuel and electrical heating, characterized in that the ducts (9) for the supply lines (8) to the electrical heating elements (6) are designed as stiffening bodies which support the muffle against the furnace masonry. 2. Muffelofen nach Anspruch i, da-,durch gekennzeichnet, daß die Durchführungsrohre (9) sowohl mit der Muffel als auch mit dem Außenmauerwerk des Ofens gasdicht verbunden sind.2. Muffle furnace according to claim i, characterized in that the lead-through pipes (9) are connected in a gas-tight manner to both the muffle and to the outer masonry of the furnace.
DEA56767D Muffle furnace with fuel and electrical heating Expired DE509288C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA56767D DE509288C (en) Muffle furnace with fuel and electrical heating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA56767D DE509288C (en) Muffle furnace with fuel and electrical heating

Publications (1)

Publication Number Publication Date
DE509288C true DE509288C (en) 1930-10-06

Family

ID=6940735

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA56767D Expired DE509288C (en) Muffle furnace with fuel and electrical heating

Country Status (1)

Country Link
DE (1) DE509288C (en)

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