TUBULAR ELECTRIC HEATER Russian patent published in 2014 - IPC H05B3/48 

FIELD: electricity.

SUBSTANCE: electric heater consists of a protective metal shell 1 separated from a heating spiral 2 by a layer 3 of a powdered electric insulating material, a current lead 4 separated from the protective metal shell by an insulating element 5 and a flange 6 connected mechanically and electrically to the protective metal shell 1; the layer 3 of the powdered electric insulating material has length-variable thickness of the heating spiral which is reduced linearly on the thickness ensuring electric strength of the layer of the powdered electric insulating material at an amplitude value of power supply voltage up to the zero value at the opposite end of the heating spiral.

EFFECT: required pressure in a coolant circulation circuit of the nuclear power plant, improvement of service life and operating reliability of the heater.

2 dwg