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Understand the electric heating tube and its functional characteristics

Understand the electric heating tube and its functional characteristics

Understand the electric heating tube and its functional characteristics


Electric heating tube, also known as heating tube, heating tube, scientific name tubular electric heater element, is a coiled heating wire (resistance wire) placed in a metal tube, and filled with good heat resistance, Thermally conductive and insulating insulating powder (MgO), the heating wire has lead rods or lead wires at both ends. It has the characteristics of simple structure, high mechanical strength, high thermal efficiency, safety and reliability, easy installation and long service life. It is widely used in all kinds of saltpeter tanks, water tanks, oil tanks, acid-base tanks, fusible metal melting furnaces, air heating furnaces, drying furnaces, drying ovens, hot press molds and other devices.

The electric heating tube is an electrical component that specially converts electric energy into heat energy. Because of its low price, easy use, easy installation, and no pollution, it is widely used in various heating occasions.


Small size and high power: The heater mainly adopts cluster tubular electric heating elements. The heat response is fast, the temperature control precision is high, and the comprehensive thermal efficiency is high. High heating temperature: The heater's design task temperature can reach 850℃. The medium outlet temperature is average, and the temperature control accuracy is high. Wide range of use and strong compliance: The heater can be used in explosion-proof or popular places. The explosion-proof grade can reach dⅡB and C, and the pressure can reach 20MPa. Long life and high reliability: The heater is made of extraordinary electric heating materials, designed to have a low power load on the surface, and adopts multiple maintenance, which greatly increases the safety and life of the electric heater. Fully automatic control: The heater circuit is designed according to the requirements, which can facilitate the completion of active control of parameters such as outlet temperature, flow, and pressure, and can be networked with computers. The energy saving results are obvious, and almost 100% of the heat generated by the electric energy is transferred to the heating medium.


The typical structure of the metal tubular electric heating tube (multiple structure) is generally composed of 5 parts: insulator, sealing material, lead rod, filler, electric heating wire, metal sheath and terminal.

The spiral heating wire and the lead-out help are located in the center of the metal sheath. Its manufacturing process is to penetrate the spiral heating wire into seamless steel pipe, copper pipe or aluminum pipe. The gap is evenly filled by a multi-tube filling machine. Thermally conductive oxidizing medium, such as crystalline magnesia powder (alumina or clean quartz sand can also be used). Then use a tube shrinking machine to reduce the diameter of the tube to make the oxide medium compact (density reaches 3.3g/cm3 or more), to ensure that the heating wire is isolated from the air, and the center position does not shift and touch the tube wall. such. The heat per unit area can be increased more than ten times. The service life can be correspondingly increased to more than 10 years. Compared with the electric heating element with the same large heat, the tubular electric heating tube can save 5% of the electric heating material, and the thermal efficiency can reach more than 90%.

Therefore, from the perspective of the structure of the electric heating tube, the metal tubular electric heating tube is currently the most widely used sealed electric heating element with simple structure, reliable performance and long service life. It can be successfully applied to industry and household appliances, and it is increasingly used. widely. Hope that more users have a clear understanding of the structure principle of the electric heating tube.

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