Electrode structure of ceramic electric heating unit and its forming method

Abstract

This invention relates to an electrode structure of a ceramic electric-heating unit and its shaping method, especially to an electrode structure used in the connection of resistance sheets with the positive temperature coefficient resistance sheets as the heating source and its structure method used in the electric conduction face of the ceramic resistance sheets, which combines with an insulation heat-conduction indirect plate with an equal thermal deformation volume to that of the ceramic resistance plate, the indirect plate has a dielectric layer with one end extending to connect with a conduction terminal to conduct the power, which passes through the resistance plate via the dielectric layer to make the plate to work with heat.

Description

【Technical field】 [0001] The invention relates to an electrode structure and its forming method of a ceramic electric heating unit, especially the electrode structure and its forming method applied to a positive temperature coefficient ceramic heating resistor to form an electrical connection. 【Background technique】 [0002] Regarding the thermal unit with positive temperature coefficient ceramic resistor as the heat source, due to the constant temperature effect of the ceramic chip and the non-open flame working state during thermal operation, it is suitable for safety requirements and is widely used as a thermal unit for heating. [0003] For general design, please refer to figure 1 As shown, the electric heating unit 10 used in the past is mainly composed of a positive temperature coefficient ceramic resistance sheet 1, and an electrical conduction surface 100 is formed on its outer surface. The conduction surfaces 100 are respectively formed with conductive coatings 11, ...

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Problems solved by technology

[0005] Furthermore, since the thermal deformation (coefficient) of the material is different between the ceramic resistance sheet 1, the conductive metal sheet 2, and the heat conduction box 3, different expansion displacements are produced due to thermal effects, and the combined There will be a mutual differential pulling action between the mechanical forces, especially if the thermal deformation between the conductive metal sheet 2 and the heat conduction box 3 is obviously different, the relative displacement is relatively unequal and the displacement will occur The drop value will form a split phenomenon, and the insulating film 4 that is clamped will be torn. After the insulating film 4 is torn, it will lose its insulating effect.

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