Flat plate thick film heater and preparation process thereof

Abstract

The invention discloses a flat plate thick film heater and a preparation process thereof. The heater comprises a circular base plate, a thick film heat generating layer as a heating element on a lowersurface of the circular base plate, a through hole at the center of the circular base plate, and a support cap disposed on the upper surface of the circular base plate. A heating area is arranged between a peripheral edge of the circular substrate and the through hole and is adjacent to the peripheral edge of the circular substrate and the through hole, an insulating protection film layer is printed on the surface of the thick film heat generating layer, the support cap protrudes upward from an edge of the through hole, and an open end of the support cap is fixed to the through hole by welding. According to the process, the circular base plate is moulded to form a circular disk surface structure, a printing area is reserved at the edge of the circular base plate and a functional layer isprinted, and an NTC thermistor is lapped in the printed area on an insulating thick film heat conducting layer. The heater of the invention has the advantages of simple structure, simple production process and short heating time, the stability and reliability of the structure of a resistance layer can be ensured, the heating time is greatly saved, and the problem that a stirring knife is difficultto disassemble and clean is solved.

Description

technical field [0001] The invention belongs to the technical field of thick-film heaters, and in particular relates to a flat-plate thick-film heater and a preparation process thereof. Background technique [0002] Thick film heater (heater) is a new type of heating device that adopts thick film screen printing process to print insulating medium, heating resistor and heat conductor and other materials on the substrate, and sinters at high temperature. It is widely used in electric kettles, electric coffee Kettle, electric milk churn, electric water heater, electric hair board, electric iron, etc. Compared with the traditional electric heating wire heater, the thick film heater has the characteristics of high power density, good thermal conductivity, large heat dissipation area and high safety performance. [0003] The thick-film heater used in the traditional milk churn is not designed with a special stirring tool, so that the milk churn can only be stirred alone, and the ...

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Problems solved by technology

[0003] The thick-film heater used in the traditional milk churn is not designed with a special stirring tool, so that the milk churn can only be stirred alone, and the stirring and heating can not be performed well at the same time, so the use effect is not good and cannot satisfy People's needs; due to the small space used by the thick film heater, the heat exchange of the thick film heater is limited to one surface of the heating plate, and the temperature of the center heating is often inconsistent with the heating temperature of the edge, resulting in the entire heater. Heating is uneven, therefore, a thick film heater for a safer milk churn needs to be designed

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