Vacuum-formed electrical heating device and method of...

H - Electricity – 05 – B

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H05B 3/36 (2006.01) H05B 3/18 (2006.01) H05B 3/28 (2006.01) H05B 3/62 (2006.01)

Patent

CA 1213635

ABSTRACT OF THE DISCLOSURE In a vacuum-moulding process for manufacturing an electrical heating unit, in which process a resistance heating coil is placed on a sieve-like tray, above a suction box, and a slip is applied thereto, this slip being composed of ceramic fibres, so that a ceramic fibre layer builds up under the action of suction, it is proposed, according to the invention, that portions of the sieve-tray be closed, in regions beneath the resistance heating coil, in particular by means of spacing strips, and that these strips, which cover some of the perforations in the sieve-tray, be placed beneath the resistance- heating coil, but in a manner such that the impervious regions of the sieve- tray are narrower than the width dimensions of the heating coil. These measures lead to the result that the space inside the heating coil remains free of fibre material during the vacuum-moulding operation, so that the temperature difference between the radiating side of the heating coils and their rear side, which lies within the composition forming the fibre block, is smaller than in conventional heating units of this type, in which there is a risk of crystallization of the fibres forming the fibre block. The use of spacing strips produces retaining webs on the radiating side of the fibre block, these webs ensuring that the heating coils are securely anchored.

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