There are many types of electric heating components, conventional varieties, electrothermal alloys, electrothermal materials, microwave heating devices, electromagnetic induction heat devices, electric heating tubes, electric, electric heating plates, electric heating cables, electric heating cables, electric heating plates, electric thermocouples, electric heating coils, electric heating Rod, electric heating cable, electric heating core, mica heating sheet, ceramic heating sheet, tungsten and molybdenum products, silicon carbon rod, molybdenum powder, tungsten rod, electric heating wire, mesh belt, and many types of electric heating elements.
Electrothermal castings are another classification of electric heating elements, such as cast aluminum, cast copper, cast iron heaters, PTC heating elements, and steam heat pipes.
Resistance band far-infrared radiant heater is used for heating equipment of drying tunnel, drying room and oven, related industry cable tray, electric heater, electric heating boiler, boiler electric heating tube, oven electric heating tube, fin electric heating tube, explosion-proof electric heating , tank electric heater, high temperature ceramic electric heater, molecular sieve electric heater, circulating electric heater, crawler electric heater, hot water heater, fluid circulating electric heater.
1, electric heating wire
Electric heating wire is an electric heating element that appeared early in Zui. It uses electric heating as the basic working principle to realize energy conversion. Although the heating wire is a traditional electric heating element, it has not been replaced yet, and the heating wire is still widely used in various fields, especially industrial production and laboratories.
In recent years, electric heating wire has adopted iron-chromium-aluminum alloy and nickel-chromium alloy, and the high temperature of iron-chromium-aluminum alloy has reached 1400 °C. On the basis of electric heating wire, electric heating elements such as electric heating rods, electric heating plates and electric heating sheets have been developed in recent years, but their essence is still electric heating wire, and the principle cannot be separated from electric heating.
The advantages of the heating wire are high heating temperature and heat-resistant temperature, mature technology, easy to manufacture and convenient for use in various electric heating equipment. The shortcoming of the heating wire is that its energy conversion rate is low, and the heating process is accompanied by the illuminating process, so the electric energy conversion rate can only reach 60% to 70%.
2, PTC heating element
The full name of PTC is Positive Temperature Coefficient, which is a thermistor, which is an electric heating element obtained by composite sintering of conductive materials. The PTC heating element is an electric heating element that appears after the heating wire. It is limited by the Curie temperature and can only be used in heating below 350 °C. It is used in various low-power low-temperature electric heating equipment.
The advantage of the PTC heating element is that there is no open flame when heating, and the heating efficiency can reach 70%. The shortcomings of PTC electric heating elements are poor seismic performance and can not be cut and used at will. Especially PTC electric heating elements are limited by Curie temperature and cannot be used for heating above 350 °C. Therefore, the application of PTC electric heating elements in actual production and life can only be limited. In the field of low temperature heating.
3, conductive coating
Conductive coatings, also known as black films, were produced in the late 1950s and can be used as electric heating elements after being sprayed on the surface of insulating materials. The conductive coating itself has many uses, and has less application as an electric heating element. Its advantages are surface heating, large heat dissipation area, and good seismic performance, but the disadvantage is that the heating layer is easy to fall off, and can only be applied to heating below 200 °C.
4, electric film
Electrothermal film is a new type of electric heating element in recent years. It is made by taking the characteristics of two kinds of electric heating elements of PTC and conductive coating. Electric heating film is currently mainly used in indoor heating and environmental temperature maintenance, such as building heating, brooding room insulation.
The advantages of the electrothermal film are no open flame heating, planar heating, less thermal resistance, fast heat conduction, long service life, and easy cutting and separation. In particular, the electric heating film has an electric energy conversion efficiency of up to 90% and a small heat loss.
The shortcoming of the electric heating film is that the heating rate is slow, the heating temperature can not reach a high value, and the heat dissipation speed is fast after the power failure.
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