JPS6221912Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electrode part structure of an electric furnace for producing silicon carbide.

Electric furnaces for producing silicon carbide are usually long furnaces, with graphite electrodes installed through the fixed walls at both ends, the side walls above the floor level are made of open bricks, and the bottom of the furnace is made of highly refractory refractory bricks. There is.

Figures 1 and 2 show the fixed wall part of a conventional electric furnace for producing silicon carbide. The electrode part has a refractory material (refractory brick) 3a on the outside, a silicon carbide caster (SiC aggregate cemented) 3b is provided inside, and a graphite electrode 3c is placed horizontally on these members. It is configured by inserting it. 4 in the figure indicates a water-cooled clamp. Since this clamp and the graphite electrode are connected by screwing, they are water-cooled in terms of thermal expansion and heat generation.

In the structure of the electrode part described above, gaps may occur between the contact surfaces of both parts of each member due to the difference in thermal expansion between the refractory material and the silicon carbide caster and the accuracy of construction, or cracks may occur in the electrode holding member. External air enters the electrodes and refractories, causing oxidation and wear and tear, and as the wear progresses, gas in the furnace leaks, shortening the lifespan of the electrodes.

This invention was devised with the intention of improving the drawbacks of the conventional structure of the electrode section.

The purpose of this invention was to reduce costs by not using graphite electrodes, and to create an electrode structure that could omit water cooling management by using the electrode itself as an electrode and eliminating the need for water cooling of the holder. It is about providing.

Hereinafter, the configuration and effects of this invention will be explained with reference to the accompanying drawings. In addition, Figures 1 and 2
Reference numerals corresponding to those in the figures are represented in the same way.

In FIGS. 3 and 4, the electrode part 3 is constructed by fixing several metal pieces 6, for example, iron pieces (fins) to the inner wall of the case at predetermined intervals in parallel to each other in the lateral direction, and placing carbon paste inside the case. is filled, and the bus bar 7 is connected to the outer case via the connection base 7a. The metal piece 6 is integrated with the fired body 3b' which is self-fired by the furnace heat of the filled carbon paste to form an electrode section.

Since the electrode section configured in this manner does not use graphite electrodes, the cost can be reduced. Also the second
In the structure shown in the figure, the graphite electrode and clamp (holder) are connected by screws, so water cooling is required to prevent thermal expansion and heat generation. Since it is a connection,
Since there is no need for water cooling, water management by water cooling is omitted, and there are additional advantages such as cost reduction by using inexpensive carbon paste as the silicon carbide for the caster.

If the electrode part structure of this invention is followed, the service life of the electrode part will be extended, and the construction will be easy.
This has the advantage of reducing costs overall.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a fixed wall of a conventional electric furnace for producing silicon carbide, FIG. 2 is a side view thereof, and FIG. The plan view and FIG. 4 are side sectional views taken along line X-X' in FIG. 3. Explanation of symbols, 2... Concrete part, 3... Electrode part, 3a... Refractory, 3b... Silicon carbide caster, 3b'... Carbon paste fired body, 3c
... graphite electrode, 5 ... iron case, 6 ... metal piece, 7a ... busbar connection base, 7 ... busbar.

Claims (1)

[Scope of utility model registration request] In an electric furnace for producing silicon carbide, graphite electrodes are installed through fixed walls provided at both ends of the furnace, the area above the floor surface of the side walls is made of empty bricks, etc., and the bottom of the furnace is made of refractory bricks, etc. An electrode part structure of an electric furnace for producing silicon carbide, in which the electric parts of the fixed walls at both ends of the furnace are integrally constituted by a plurality of metal pieces and a carbon paste fired body.