Burner able to treat high temperature material

摘要

The heating is achieved using electrical resistances The burner includes a heating zone suitable for heating glass materials. This zone is U shaped when viewed from the front so the upper and lower branches of the U are horizontal. The heating zone is defined on two walls by at least two electrical resistance zones forming two of the three walls of the heating zone. These two electrical resistance zones form the upper and lower walls, acting as the upper and lower branches of the U. A third electrical resistance zone may form the base of the U. The temperature in the heating zone varies between 850 and 950 deg. C and preferably reaches 900 deg. C. The burner includes means of channeling air from the heating zone, forming a chimney, and forming an air inlet at the base followed by a vertical air preheating zone. The preheating zone contains a vertical resistive element called the preheating resistance. This is central or along one wall of the preheating zone. The internal volume of the air channel has three walls of refractory material, preferably vermiculite. The air inlet zone lies between the means of holding the furnace down, on which the refractory walls sit, and the means of channeling the air, containing a base resistivity zone. And an open heating zone above the upper resistivity zone of the burner. The temperature in the open heating zone is around 800 deg. C. A box encloses the means of channeling the air, the means of holding the furnace down and the different resistivity zones. A metallic dissipator formed by three sides in a U is placed between the means of channeling the air and the resistive zones. The dissipator has on its parallel sides are cutout in a U shape corresponding to the heating zone. The distance between the dissipator and the walls of the means of channeling the air is between 3 and 8mm, preferably between 4 and 6mm and best at 5mm. A protective element which can be enclosed in the dissipator prevents direct contact between the electrical resistances and the material to be worked or to be heated. The protective element is in the form of an upper case S from a side view.