Double-flow tubular electric heater provided with insulating guide sleeve insulating material for scale inhibition of heat exchange surface

Abstract

The invention provides a double-flow tubular electric heater provided with an insulating guide sleeve insulating material for scale inhibition of a heat exchange surface. The inner surface and outer surface of the tubular electric heater are provided with electric heating bodies, the heat exchange surfaces of the electric heating bodies are electric insulating material surfaces, and the scale inhibition of the heat exchange surface is achieved through an electric insulating material. The tubular electric heater is electrically insulated and fixed on a mounting and fixing base; the lower end ofan outer electric insulating tube is arranged on the mounting and fixing base. Three concentrically sleeved electric insulating tubes compose the insulating guide sleeve; water enters through a waterinlet pipe orifice of the outer electric insulating tube and a water inlet port of the inner core electric insulating tube, passes through a throttling device formed between the pipe orifice of the bottom of the intermediate electric insulating tube and the mounting and fixing base, enters a hot water cavity of the tubular electric heater of which the heat release surface is the electric insulating layer, and the heated water passing through the tubular electric heater of which the heat release surface is the electric insulating layer is discharged from an upper end orifice of the intermediate electric insulating tube; the temperature of the water is increased rapidly after being heated by the heater, thereby achieving the instant hot requirements, the production cost is low, processing is easy, and the performance is excellent.

Description

technical field [0001] The invention relates to the field of electric heating, in particular to a cylindrical electric heater provided with an insulating guide sleeve, an insulating material heat exchange surface, and a scale-resistant double-flow channel. Background technique [0002] Existing electric 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, which will lead to the temperature of the metal electric heating tube being too high, which will easily cause the metal tube to burn. Corrosion, shortened service life. Although the quartz glass electric heater is not easy to scale, but because the heat dissipation area of ​​a single tube and the density of the heating unit need to match, the tube with a large heating unit often needs to be made larger in order to meet the demand for the heatin...

AI Technical Summary

Problems solved by technology

[0002] Existing electric 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, which will lead to the temperature of the metal electric heating tube being too high, which will easily cause the metal tube to burn. Corrosion, shortened service life

Although the quartz glass electric heater is not easy to scale, but because the heat dissipation area of ​​a single tube and the density of the heating unit need to match, the tube with a large heating unit often needs to be made larger in order to meet the demand for the heating unit, and the volume is too large. It causes a lot of inconvenience in terms of strength, installation space, safety, and cost, and it is difficult to control the heating unit

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