Novel electrical heating unit

Abstract

The invention relates to a novel electrical heating unit which at least comprises a substrate and an electrical heating film attached to the substrate, wherein the at least one substrate is made of aluminum oxide ceramics; the aluminum oxide ceramic substrate is in a plane-shaped structure; and at least one electrical heating film is attached to at least one surface of the aluminum oxide ceramic substrate. Thus, the electrical heating films can generate heat on one surface of the substrate, on which the electrical heating film is arranged, and the heat is evenly generated from the attached surface and transmitted through the aluminum oxide ceramic substrate so as to generate uniform heating effect.

Description

Technical field: [0001] The invention relates to electric heating equipment, specifically a newly designed electric heating unit, which has a uniform plane heating function and can conduct one-way heat transfer. Background technique: [0002] Ordinary glass-ceramics, micro-ceramics, and quartz glass sheets are commonly used in the market to coat electric heating films to make electric heaters, but this material has a low thermal conductivity, and the temperature of the electric heating film is at the desired high power density, such as per square centimeter 5 watt hours, at least above 200 degrees C when used, is not suitable for household appliances made of plastic, and also affects the safety of the control circuit of household appliances. [0003] Commonly used electric heaters are mainly made of electric heating wires. The electric heating wires are installed in metal tubes. When energized and heated, the heat is conducted through the metal tubes to achieve the purpose o...

AI Technical Summary

Problems solved by technology

However, the surface area of ​​the heat transfer part of the metal heating tube is not large, so that the heat conduction power per unit area of ​​the local area is too large, that is, the temperature of the tube will be too high, and the so-called horseshoe print scorched layer may be produced during use. It is not only difficult to use for a long time. Scraping the burnt layer, and it has a burnt smell, will bring adverse effects, one is to affect the heating efficiency, and the other is to affect the service life of the heating wire. The heating of the device is uneven, and it is difficult to produce a good heating effect

[0004] Alumina ceramic has good thermal conductivity, good insulation performance, and moderate material price, and has been widely used in heat dissipation in various fields. However, when it is used as a heating source, due to the double-sided anisotropy of the alumina ceramic sheet, the heat capacity is small. Using it as a substrate to make high-power electric heating film heaters will often crack and fail to form qualified products

[0005] This is the reason why alumina ceramic sheets are often used as heat dissipation in the market today, but not as a heat source.

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