SU357689A1 - ALL-UNION I - Google Patents

Description

. I

This invention relates to electric resistance furnaces for heating articles, for example, cylinders of magnetically controlled contacts.

Electric resistance furnaces are known with a focusing screen and a heater located in the working chamber of the furnace.

The purpose of the invention is to increase the specific radiation power and to ensure uniform heating of the product.

This is achieved by the fact that the focusing screen has the shape of an elliptical toroid, in the center of which a cylindrical tube made of a material that is transparent to radiation energy, such as quartz, is embedded, and the heater is mounted in a furnace around a circle passing through the outer focus of the toroid.

The drawing shows the proposed oven.

In a horizontally split housing / furnace, the focusing screen 2 is configured as a part of an elliptical toroid. A resistance heater 3, for example, a wire helix, passes through an annular focus f. A cylindrical tube 4 made of a material that is transparent to radial energy is embedded in the center of the furnace body. The product 5 is placed in the center of this tube, in the near-focal space of the internal focus F.

From the schematic diagram of the direction of the rays by the arrows, it can be seen that in a furnace of this design, the rays are focused at one optimum point for heating the product. If necessary, protective gas can be fed to the furnace floor.

Subject invention

An electric resistance furnace with a heater and a focusing screen, characterized in that, in order to increase the specific radiation power and uniform heating of the product, the focusing screen has the shape of an elliptical toroid, in the center of which is a cylindrical tube made of a material that is transparent to radial energy, quartz, and the heater is mounted in a furnace around a circle passing through the external focus of the toroid.