A tubular electric heater is made by placing a metal resistance wire inside a metal tube and tightly filling the gaps with crystalline magnesium oxide, which has good thermal conductivity and insulation. It can be immersed in water or other liquids, or directly placed in solid metal to heat the metal. Due to its simple structure, high thermal efficiency, good mechanical strength, safety, reliability, lightness, and durability.
It is now widely used in China's aviation industry, shipbuilding industry, petroleum industry, chemical industry, and daily-use industries, such as for saltpeter tanks, water tanks, various oil tanks, acid-base heating devices, low-melting-point metal melting furnaces, air heating furnaces, drying ovens, various molds and press molds, electric irons, steam cookers, and cooking appliances.
The tubular electric heater is composed of a metal tube, a spiral resistance wire, and electrical-grade magnesium oxide powder with good thermal conductivity and insulation, along with terminals. It is widely used for heating liquids, air, etc. Common examples include water heaters, ovens, and coffee makers.
The heating tube is made by inserting an electric heating wire into an outer tube (carbon steel tube, titanium tube, stainless steel tube, copper tube), filling the gaps with magnesium oxide powder that has good thermal conductivity and insulation, then shrinking the tube. After heat treatment (some tubes do not require it), it is processed into various shapes as needed by the user. It has a simple structure, high thermal efficiency, good mechanical strength, and good adaptability to harsh environments. It can be used for heating various liquids, acids, alkalis, and salts, as well as for melting low-melting-point metals.
Scope of use for tubular heaters: suitable for heating air, oil, water, chemical media, hot press molds, melting salts, alkalis, and low-melting-point alloys. It features high thermal efficiency, long service life, high mechanical strength, easy installation, safety, and reliability.
