Electric heating device capable of uniformly and intensively heating

Abstract

An electric heating device capable of heating uniformly and intensively comprises a metal shell and a connector, one end of the metal shell is sealed, the other end of the metal shell is fixedly connected with the connector, a wiring terminal is arranged at the upper end of the connector, and a metal heat collection core rod extending axially is arranged in the metal shell. An armored heating cable is wound on the outer circumference of the metal heat collection core rod in a double-spiral shape, heat conduction powder is filled in a gap space between the metal heat collection core rod and the metal shell, an electric heating alloy wire in the armored heating cable extends into a connector cavity to be fixedly connected with a wiring terminal, and the connector cavity is filled with an insulating material. Heat is concentrated, heating is uniform, and reliability is high.

Description

technical field [0001] The invention relates to the technical field of electric heating, in particular to an electric heating device for uniform and concentrated heat generation. Background technique [0002] Electric heating rods are widely used in electric heating of liquid media in nuclear energy, chemical industry, machinery and other fields. In the existing electric heating rod, the electric heating alloy wire is usually directly wound into a spiral, and then passed through a metal outer sleeve, and then drawn out after the connecting section is connected with the terminal. The metal outer sleeve is filled with insulating ceramic powder material, and the filled insulating ceramic powder is compacted by metal processing such as spinning and swaging, and the nozzle of the metal outer sleeve is sealed by welding. However, this structure generates heat by winding the helical heating alloy wires, and there must be gaps between the helical heating alloy wires, which is prone...

AI Technical Summary

Problems solved by technology

However, this structure generates heat through the helical electrothermal alloy wire, and there must be gaps between the helical electrothermal alloy wires, which is prone to uneven heating. Moreover, due to the ceramics filled in this structure Powder materials usually have the functions of insulation and heat conduction at the same time. Therefore, alumina or magnesia ceramics are generally used. These ceramics have low thermal conductivity and have defects in processing. When the power density of the heating rod is high, it is easy to cause The internal temperature of the heating rod is too high or the temperature distribution is uneven, resulting in damage to the heating rod due to excessive internal local temperature

Images