GB190629120A - Improvements in Electric Heaters for Fluids. - Google Patents

Abstract

29,120. British Thomson-Houston Co., [General Electric Co.]. Dec. 21. Heating liquids.-Relates to an electric heater for fluids of the induced alternating-current type, in which heat is produced in a body designed to act both as an hysteretic core and as a closed secondary. The heavy secondary 12, Figs. 1 and 2, of an external transformer having a primary 10 and magnetic core 11 is surrounded by tubes 14 formed as passages in a magnetic shell or casing 13 jacketed with a non-conductor 17, 19 ; this shell forms the secondary and core within which heat due to hysteresis and eddy currents is produced. Liquid is caused to circulate through the tubes, which may be employed for generating steam or heating circulating water or oil, and enters and leaves by the pipes 15, 16, respectively. The coil 12 is narrowed or cut away at 18, as shown, so as to obviate the transfer of heat from the shell to the primary 10 without materially affecting the electric conduction. In one modification, the heating-coil is entirely surrounded by the casing ; in a further modification, Fig. 5, the heating-coil 22 is arranged so that liquid entering at 23 may first circulate round it, and thence pass through the tubes contained in the casing as before,