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

FIELD: electricity.

SUBSTANCE: tubular electric heater comprises a protective metal shell 1 with a flange seal 2 and a connection element 3 for supply of feed voltage, dielectric washers 4, internal and external cylindrical surfaces 5 and 6 are metallised, and flat cylindrical surfaces are coated with a resistive layer 7, with rising resistance in radial direction, the resistive layer 7 has an electric contact with metallisation on the internal cylindrical surface 5 and the external cylindrical surface 6 of washers 4, metallisation on the internal cylindrical surface 5 of washers has electric contact with the internal tubular current lead 8, metallisation on the external cylindrical surface 6 of washers has electric contact with the shell 1. The electric heater is mounted into a reservoir with a heated liquid so that the protective metal shell 1 and the reservoir itself are grounded, which complies with requirements of the Regulations of Electric Installation Design (PUE). When feed voltage is supplied to the connection element 3 from the grid made in accordance with the circuit of dead-earthed neutral, this voltage via the internal tubular current lead 8 becomes applied to the resistive layer 7 of all dielectric washers, where heat release takes place.

EFFECT: increased resource and operational reliability of a tubular heater due to higher heat conductivity in direction from a heat release element to a surface of heat exchange with external coolant.

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