ELECTRIC AIR HEATER Russian patent published in 2010 - IPC F24H3/08 

FIELD: power industry.

SUBSTANCE: electric air heater includes housing with inlet and outlet holes, inlet and support tube sheets in which there longitudinally installed are tubular heating elements which are equipped with current leads, and current leads and connecting straps fixed on the side of inlet hole in tube sheet and passing with a gap through electrically-insulating assemblies of support sheets. Exit sections of heating elements are equipped with converging diaphragms, and current connecting straps consisting at least of three pieces are made in the form of expansion loop and rigidly installed on ends of heating elements, between which drain holes are made; at that, expansion joints are bent towards exit section.

EFFECT: decrease in temperature of each plate of connecting strap, reduction of pressure pulsation and the appropriate structural vibrations leads to decrease in racking alternate loads on them, increases service life of connecting straps, electrically insulating sleeves, tubular heating elements and the whole electric heater.

5 dwg