Scale inhibition double-flow-channel loop tube electric heater with electric insulating surface as heating surface

Abstract

The invention provides a scale inhibition double-flow-channel loop tube electric heater with an electric insulating surface as a heating surface. The inner surface of a loop tube electric heater framework is coated with a coating for forming an electric heating film, after the electric heating film is formed by sintering, an appropriate position of the electric heating film is coated with a conductive silver paste, a silver electrode is made through an oven, and the electric heater which has at least two tubular heat dissipating surfaces and comprises an electric heating circuit is made. The silver electrode is connected to an electrical conductive wire to make an electric heating core. According to an electrically insulating glass surface and an electrically insulating ceramic surface, the combined force of calcium and magnesium ions to the surfaces is weak, and it is difficult to form hard scale. The silver electrode and the electrical conductive wire passes through a set sealing rubber sleeve which seals an opening end of the loop tube electric heater framework, an electrode closing electrical conductive wire is led out, and a wiring terminal which facilitates electrical connection is welded to the led electrical conductive wire. Since the scale inhibition double-flow-channel loop tube electric heater has the advantages of simple and reliable structure, high safety, low costand easy processing, a water heater is quickly started, the energy is saved, and the water heater is ready to use and has good performance and represents the future development direction of water heater application.

Description

technical field [0001] The invention relates to the field of electric water heaters, in particular to an electric heater with an electric insulation surface and a scale-resistance double-channel ring-cavity tube. Background technique [0002] Existing electric water heaters generally adopt the form of electric heating wire filled with magnesium oxide powder in the metal tube. Because the metal tube is conductive, the surface of the metal tube will be scaled, resulting in poor heat transfer effect, resulting in excessive temperature of the metal electric heating tube, which easily causes the metal tube to be damaged. Corrosion, shortened service life. Although the quartz glass electric heater is not easy to scale, but because the heat dissipation area and power density of a single tube need to be matched, high-power tubes often need to be made larger in order to meet the demand for power, and the size is too large. The installation space, safety, cost and other aspects cause...

AI Technical Summary

Problems solved by technology

[0002] Existing electric water heaters generally adopt the form of electric heating wire filled with magnesium oxide powder in the metal tube. Because the metal tube conducts electricity, the surface of the metal tube will be scaled, resulting in poor heat transfer effect, resulting in excessive temperature of the metal electric heating tube, which easily causes the metal tube to be damaged. Corrosion, shortened service life

Although the quartz glass electric heater is not easy to scale, but because the heat dissipation area and power density of a single tube need to be matched, high-power tubes often need to be made larger in order to meet the demand for power, and if the volume is too large, it will affect the strength, It causes a lot of inconvenience in terms of installation space, safety, and cost, and it is difficult to control power

Images