Flexible ceramic PTC electric heater assembly

Electric heating – Heating devices – With heating unit structure

Patent

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Details

123548, 123549, 123590, 219206, 219207, 219275, 219505, 219541, 219549, 261142, 338 22R, 338295, 338328, F02M 3100, H05B 302, H01C 702

Patent

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043683800

ABSTRACT:
A flexible barium titanate ceramic PTC heater for use in, for example, an intake pipe of an internal combustion engine to heat the air-fuel gas mixture is formed as a thin disc-shaped ceramic sheet constituted by a plurality of individual coplanar ceramic segments having interior edges positioned in spaced side-by-side relationship. The juxtaposed edges of the ceramic segments are united to each other by a flexible, heat-resistant, electrically non-conductive rubber band disposed in the space between the segments and bonded thereto by an electrically non-conductive adhesive to form the segments into a thin disc-shaped sheet which can be flexed without causing flexing of any of the individual segments. The ceramic heater is positioned in a metallic casing with one planar face thereof bonded to the inner surface of the casing by an electrically conductive adhesive. A stainless steel wool cushioning member engages the other planar face of the ceramic heater to support the heater in the metallic casing.

REFERENCES:
patent: 3898422 (1975-08-01), Fuller et al.
patent: 3987772 (1976-10-01), McBride
patent: 3995141 (1976-11-01), Vieau et al.
patent: 4104509 (1978-08-01), Van Bokestal et al.
patent: 4121088 (1978-10-01), Doremus et al.
patent: 4242999 (1981-01-01), Hoser
patent: 4246880 (1981-01-01), Henke et al.

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