Heating tube and processing process thereof

Abstract

The invention discloses a heating tube. The heating tube comprises a heating wire, wherein the heating wire is sleeved with a first metal tube with a high melting point and high plasticity; the firstmetal tube can be a stainless steel tube; the first metal tube is filled with magnesium oxide powder for insulation and heat conduction; a second metal tube with a low melting point is arranged outside the first metal tube in a sleeving mode; and the second metal tube can be an aluminum tube. The structure is simple, and the melting point of the second metal tube is low, so that the heating tube can be easily welded to the bottom of an electric kettle; the first metal tube is high in the melting point and resistant to high temperature, so that after the second metal tube is melted at a high temperature, the first metal tube can still protect the interior of the heating tube, and the service life of the heating tube is prolonged; in the tube bending process, the reaction force generated bythe pressing of the magnesium oxide powder particles is transmitted to the second metal tube through the first metal tube with high plasticity, after the first metal tube is deformed and absorbed, thepressure of the inner side of the second metal tube is greatly reduced, so that the heating tube is not easy to break and the production cost is lowered.

Description

technical field [0001] The invention relates to an electric heating element, in particular to a heating pipe welded to the bottom of an electric kettle and a processing technology thereof. Background technique [0002] The heating tube is a tubular electric heating element. When a current passes through the high-temperature heating wire, the generated heat diffuses to the surface of the metal tube through the magnesium oxide powder, and then transfers to the heated part or the air to achieve the purpose of heating. [0003] Common heating tubes welded to the bottom of electric kettles include external aluminum tubes and internal heating wires. The aluminum tubes and heating wires are filled with magnesia powder to isolate them; The high temperature will melt the aluminum layer and cause the tube to burst; and the plasticity of the aluminum layer is low. When manufacturing the heating tube, it is necessary to compact the magnesium oxide after shrinking the tube and then bend ...

AI Technical Summary

Problems solved by technology

[0003] Common heating tubes welded to the bottom of electric kettles include external aluminum tubes and internal heating wires. The aluminum tubes and heating wires are filled with magnesia powder to isolate them; The high temperature will melt the aluminum layer and cause the tube to burst; and the plasticity of the aluminum layer is low. When manufacturing the heating tube, it is necessary to compact the magnesium oxide after shrinking the tube and then bend it into shape. Because the compacted magnesium oxide particles The higher the density, the larger the reaction force will be on the aluminum tube during the bending process, and the higher the density of the aluminum tube after shrinking the tube, the easier it is to break during the bending process of the aluminum tube, and the bending shape of the aluminum tube during processing is free The degree of bending is not high, which cannot meet the demand of high bending degree. The waste rate of the produced heat pipe is high, and the production cost is high.

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