Electric-heating device and uses thereof

Abstract

An electric heater includes two or more main body insulated sheet heating elements with electrodes and a metal casing bodies, at least one sheet heating element is arranged in each cavity of the metal casing bodies, the electrodes are exposed from the metal casing body. The metal casing bodied are arranged in parallel and certain distance space, such that air are limited to pass through a air duct between the both metal casings, heat radiation fin pieces connected to opposite surfaces of the both metal casing bodies are arranged in the air duct. The electric heater has advantages of environment protection, safety, high heat-exchange efficiency, simple structure, low cost, easy recovery.

Description

technical field [0001] The invention relates to an electric heater and its application, in particular to an electric heater used on heating appliances and drying equipment that need to heat air. Background technique [0002] Existing air conditioners, heaters, clothes dryers, industrial self-chemical drying devices, tobacco leaf or wood dryers and other equipment need to use electric heaters to heat the air in the equipment, and then the heated air will be heated by an external air blowing device. air to the desired location. Most of the existing electric heaters in this type of equipment use electric heating tubes, resistance wires or PTC as the heating body. Taking the electric heater with PTC as the heating element as an example, its basic structure is to have a piece of heat on each side of multiple PTCs. The metal sheet (constituting a plurality of parallel PTC structures) is used as an electrode, and the metal sheet is bent into a corrugated shape or arranged in a str...

AI Technical Summary

Problems solved by technology

[0003] The electric heater with the above structure and the combined electric heater composed of a plurality of electric heaters with the same structure, because the heat dissipation fins and the electrodes are the same metal sheet, the heat dissipation fins are charged, so the heat dissipation fins have the risk of electric leakage. In order to prevent users from getting an electric shock, it is necessary to carry out necessary anti-electric treatment on such electric heaters or combined electric heaters, usually by adding an insulating layer. On the one hand, adding an insulating layer increases the cost of the electric heater or combined electric heater. On the other hand, it also increases the thermal resistance, resulting in low thermal efficiency

[0004] In addition, since this kind of electric heater or combined electric heater uses PTC as the heating element, limited by the performance of PTC itself, it cannot reach a higher temperature for heating. If it exceeds 260 ° C, the PTC will automatically maintain a certain temperature and cannot continue to heat up. ; Again, if any PTC in the electric heater or the combination electric heater is damaged, then the whole electric heater or the combination electric heater is scrapped, causing the user to increase the use cost

In addition, PTC heating elements contain lead, and scrapped electric heaters or combined electric heaters will cause harm to the environment if they are not treated. If they are treated, the treatment cost will be increased

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