Electric resistance heating devices – Heating devices – Radiant heater
Patent
1992-04-10
1994-01-11
Bartis, Anthony
Electric resistance heating devices
Heating devices
Radiant heater
29611, 29613, 29848, 219542, 219544, 219546, 338226, 338252, 338275, 392435, H05B 328, H05B 102, H05B 318
Patent
active
052789390
ABSTRACT:
A vacuum-molded electrical radiant heating unit having a resistance heating coil embedded in a ceramic fiber body is prepared by a process in which a resistance heating coil (5) is placed on a sieve-like tray (1), above a suction box, and a slip is applied thereto composed of ceramic fibres, so that a ceramic fibre layer (4) builds up under the action of suction. Portions of the sieve-tray (1) are closed, in regions beneath the resistance heating coil (5) by means of spacing strips (11). These strips, which cover some of the perforations in the sieve-tray (1), are placed beneath the resistance-heating coil (5), in a manner such that the impervious regions of the sieve tray (1) are narrower than the width dimensions of the heating coil (5). These measures lead to the result that the space (8) inside the heating coil (5) remains free of fibre material during the vacuum-moulding operation, so that the temperature difference between the radiating side (6) of the heating coils (5) and the rear side (7), which lies within the composition forming the fibre block (4), is smaller than in conventional heating units of this type, in which there is a risk of crystallisation of the fibres forming the fibre block (4). The use of spacing strips (11) produces retaining webs (12) on the radiating side (9) of the fibre block (4), which ensure that the heating coils (5) are securely anchored.
REFERENCES:
patent: 3952408 (1976-04-01), Docx
patent: 4243874 (1981-01-01), Fischer
patent: 4278877 (1981-07-01), Werych
patent: 4321459 (1982-03-01), Miyahara et al.
patent: 4575619 (1986-03-01), Porzky
patent: 4719336 (1988-01-01), Sterwald
Boes Josef
Saris Leo
Bartis Anthony
Kanthal GmbH
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