Multi-layer ceramic heater element and method of making same

Details Multi-layer ceramic heater element and method of making same Multi-layer ceramic heater element and method of making same

H - Electricity

05

B

H05B 3/14 (2006.01) F23Q 7/00 (2006.01)

Patent

CA 2414687

A ceramic heater element and a glow plug incorporating the novel heater element. The heater element has a base portion and a heater portion. Conductive, insulative and resistive layers extend through both the base and heater portions. An outer conductive layer is applied to the outside of the base portion to provide a highly conductive return path. This tends to limit the heating of the resistive layer in the base portion and results in better and more reliable heat concentration in the heater portion. The heater element is further provided with a waterproof non-electrically conductive outer layer. The heater element can be assembled to form a glow plug for a diesel engine.

L'invention concerne un élément chauffant en céramique et une bougie de préchauffage comprenant cet élément de chauffage. L'élément de chauffage est constitué d'une partie de base et d'une partie chauffante. Des couches conductrices, isolantes et résistives sont réparties à la fois dans les parties chauffante et de base. Une couche conductrice extérieure est appliquée à l'extérieur de la partie de base afin d'obtenir une voie de retour hautement conductrice. Cette disposition permet de limiter le chauffage de la couche résistive dans la partie de base et d'obtenir une concentration de chaleur meilleure et plus fiable dans la partie chauffante. L'élément chauffant comporte, en outre, une couche extérieure isolante étanche à l'eau. L'élément de chauffage peut être assemblé afin de constituer une bougie de préchauffage pour moteur diesel.

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