Electric heating hand warmer with ceramic electric heating substrate

Abstract

The invention relates to an electric heating hand warmer with a ceramic electric heating substrate. The electric heating hand warmer comprises a bag body and an electric heating body disposed in the bag body. The electric heating hand warmer is characterized in that the electric heating body is the ceramic electric heating substrate serially connected with an overheat protector. By using the ceramic electric heating substrate as the electric heating body with the serially connected overheat protector, the electric heating hand warmer is simple and reasonable in structure and fast in heating, heating conditions of the ceramic electric heating substrate can be monitored by the overheat protector in real time, when dry heating due to the ceramic electric heating substrate exposes out of liquids occurs, power-off protection is performed by the overheat protector, dry heating is avoided, and accordingly the electric heating hand warmer is safe, reliable and long in service life. In addition, the novel heating body is high in heating efficiency, electricity-saving and environment-friendly, and sustainable development of industrialization is benefited.

Description

technical field [0001] The invention relates to the technical field of heat storage electric heating hand warmers, in particular to an electric heating hand warmer with a ceramic electric heating substrate. Background technique [0002] Electric hand warmer, also known as "electric heating bag" or "electric hot water bag", is favored by people as an ideal heating product in winter because of its small size, fast heating, long-lasting heat storage, soft appearance and comfortable hand feeling. [0003] The structure of the electric hand warmer includes a bag body, a power socket, a temperature control circuit and an indicating circuit assembled under the socket, and a heating device connected with the power socket circuit and arranged in the bag body. In the early electric hand warmers, the heating device installed in the bag directly used two metal sheets to soak in the electrolyte containing a certain proportion of sodium chloride. After the power was turned on, the electri...

AI Technical Summary

Problems solved by technology

This kind of electric hand warmer heating device with the heating tube as the heating body usually has many structural parts, complex assembly process, and high labor cost.

In addition, because the two input ports of the heating tube are sealed with glue, it often occurs that the heating tube cannot be heated due to trapped gas explosion due to the failure of the magnesium powder filling and baking process in the heating tube;

[0006] (2) The electric heating device with the heating wire as the heating body, the heating wire heats up quickly and evenly, but the wires cannot be stacked. If they are stacked closely, the cooling effect and heating effect will be reduced, so the common heating wire Most of them have staggered winding, and the winding process is relatively complicated. If there are sand holes in the heating wire, the water in the bag will be charged, and water and electricity cannot be completely separated.

The cost of a good heating wire is high, and the production capacity of the interlaced winding is low. If the heating wire is to prevent dry burning, the production process is more complicated, and the high comprehensive cost will also restrict the demand for its production capacity development;

[0007] (3) The electric heating device with PTC as the heating element, the PTC heating element has many obvious advantages over the above two heating elements: high thermal efficiency, fast heating speed, uniform heat dissipation, high temperature and constant temperature heating, but the existing market PTC electric heater From the perspective of hand tools: the assembly process is simple, the port sealing structure is weak, there is no anti-dry circuit control and no heat shield protection, it cannot prevent dry-burning, and there are certain safety hazards

[0008] After the electric hand warmers of the above three electric heating devices are used for a long time, the water in the bag will contain certain harmful substances and cannot meet the environmental protection requirements.

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