Small cartridge heater

Electric heating – Heating devices – With heating unit structure

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Details

602001, 219523, 219530, 219541, 219552, 338241, 338303, 338326, H05B 302

Patent

active

045103771

ABSTRACT:
A cylindrical core of a ceramic such as alumina (Al.sub.2 O.sub.3) has grooves in the form of a double lead thread. A coil of Nichrome V is placed in the grooves, starting in one lead of the thread and returning in the other. A split ring of a ceramic such as beryllia surrounds the core. The heater is enclosed in a housing of a metal such as Inconel 600. The entire cartridge is only one inch long and 3/16 inch diameter. It is used as a catalyst bed heater for a satellite thruster.

REFERENCES:
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patent: 2856500 (1958-10-01), Hartman
patent: 2863032 (1958-12-01), Morris
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patent: 3476915 (1969-11-01), Rapsis
patent: 3612822 (1971-10-01), Edin
patent: 3694628 (1972-09-01), McGwire et al.
patent: 3983361 (1976-09-01), Wild et al.
patent: 4169351 (1979-10-01), Barber
patent: 4288982 (1981-09-01), Kuenzly et al.
patent: 4305247 (1981-12-01), Ellion et al.
patent: 4426568 (1984-01-01), Kato et al.
G. W. Joseph, Improved Monopropellant Thruster Heaters, (AFRPL-TR-81-49), Jul. 1981, available through DTIC AD B060333L, (with distribution list).

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