Also known as heating tube, heating tube, scientific name tubular electric heater element, is to put a coiled wire (resistance wire) in a metal tube,
And the surrounding and void parts are filled with insulating powder (MgO) with good heat resistance, thermal conductivity and insulation, and the two ends of the heating wire have a lead rod or lead wire. It has the characteristics of simple structure, high mechanical strength, high thermal efficiency, safety and reliability, easy installation and long service life. Widely used in all kinds of saltpeter tank, water tank, oil tank, acid and alkali tank, fusible metal melting furnace, air heating furnace, drying furnace, drying box, hot pressing mold and other devices
