The invention belongs to the technical field of an
electric heating apparatus, and relates to a special-tube-shaped
electric heating apparatus and a preparation method therefore. The main body structure comprises an
electric heating tube, electric heating wires,
magnesium oxide, an inner lead-out rod, an outer lead-out rod, a fuse, a pressing plate
assembly, a heat sensor, a
flange, a rubber sealing strip, an insulator and a terminal; the preparation method comprises the steps of carrying out H2 annealing, wire winding, and
spot welding, adding
magnesium oxide, measuring withstand
voltage, reducing the
tube diameter, performing aligning, bending the tube and forming, clamping the tube, carrying out overall
oil pressure processing,
cutting the rod, assembling the rod, assembling the sealing strip,
drying and removing
moisture, detecting the insulation, packaging the insulator, carrying out water
voltage test, resistance value test and withstand
voltage test, installing the heat sensor, examining the appearance and the packaging, leaving the factory, and the like. The apparatus is simple in structure, creative in
material selection, simple and convenient to manufacture, simple in steps, good in product quality, long in service life, and high in
safety property.