Tubular Electric Heater Element
Heating tube, also known as heating pipe, heating pipe, scientific name tubular electric heater components, is put in the metal pipe into the wire-shaped heating wire (resistance wire)
And insulating powder (MgO) having good heat resistance, thermal conductivity and insulating property is filled in the peripheries and interstices of the heating wire, and lead-out rods or lead wires are provided at both ends of the heating wire. It has a simple structure, high mechanical strength, thermal efficiency, safe, reliable, easy to install, long life and so on. Widely used in a variety of saltpeter tank, sink, tank, acid tank, fusible metal melting furnace, air heating furnace, drying oven, oven, hot die and other devices.
Electric tube is a specialized electrical energy into electrical energy components, because of its cheap, easy to use, easy installation, pollution-free, are widely used in a variety of heating occasions.
Small size, high power: Heater mainly using the bundled tubular heating element. Warm echoes, high temperature control accuracy, high overall thermal efficiency. High heating temperature: heater design maximum task temperature up to 850°C. Media outlet temperature on average, high temperature control accuracy. Wide range of use, strong compliance: The heater can be used in explosion-proof or popular places, explosion-proof grade up to d Ⅱ B-level and C-class, pressure up to 20 MPa. Long life, high reliability: The heater is made of extraordinary electric heating materials, the design of the appearance of low power load, and the use of multiple maintenance, so that the electric heater safety and life greatly added. Can be fully automated control: According to the requirements of the heater circuit design, can be easily completed the outlet temperature, flow, pressure and other parameters of active control, and computer networking. Energy-saving results are obvious, almost 100% of the energy generated by the heat transmitted to the heating medium.
The typical structure of the metal tubular heating tube (the most popular structure) is generally composed of 5 parts: insulator, sealing material, lead rod, filler, heating wire, metal sheath tube, terminal.
The spiral electric heating wire and the lead-out wire are located in the center of the metal sheath tube. Its manufacturing process is to insert the spiral type heating wire into the seamless steel tube, the copper tube or the aluminum tube. The gap is uniformly filled with the insulation and Thermal conductivity of the oxidizing medium, such as crystalline magnesium oxide powder (also available alumina or clean quartz sand, etc.). Then use a shrinking tube to narrow the tube diameter, so that the oxide medium is dense (density of 3.3g / cm3 or more), to ensure that the heating wire is cut off from the air, and the center position is not offset and touch the tube wall. such. Heat output per unit area can increase ten times. The service life can also be increased to more than 10 years. Compared with the same large heating element, 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 structure of the electric heating tube, the metal tubular electric heating tube is currently the most widely used, simple structure, reliable performance, long service life of the sealed electric heating element can be successfully used in industrial and household appliances, the use of more and more widely. Hope that more users have a clear understanding of the structure of the principle of electric heating tube.