Working principle of electric heating wire The working principle of electric heating wire is the same as that of other metal heating elements, and it is the electric heating phenomenon after metal is energized. Electrothermal means that after the current passes through the conductor, the current generates a certain amount of heat and is transmitted by the conductor. The heating wire itself is a metal conductor that emits heat and provides thermal energy when energized.
2. Types of electric heating wire The type of electric heating wire is divided according to the chemical element content and organizational structure of the heating wire. The types of electric heating wire are iron chromium aluminum alloy electric heating wire and nickel chromium alloy electric heating wire. These two kinds of heating wires are used as electric heating elements and have different functional characteristics.
3. Advantages and Disadvantages of Iron-Chromium Aluminum Alloy Electric Heating Wire The advantage of the iron-chromium-alloy aluminum heating wire is the high operating temperature. The maximum operating temperature of the iron-chromium-aluminum alloy heating wire can reach 1400 °C. The iron-chromium-aluminum alloy heating wire has long service life, high electrical resistivity, high surface composite, and good oxidation resistance. The disadvantage of the iron-chromium-aluminum alloy heating wire is that the strength in the high-temperature environment is low, and the plasticity of the iron-chromium-aluminum alloy heating wire is enhanced with the increase of the temperature, that is, the iron-chromium-aluminum alloy heating wire is easily deformed at a high temperature. And it is not easy to repair after deformation.
4. Advantages and Disadvantages of Nickel-Chromium Alloy Heating Wire Nickel-chromium alloy heating wire has the advantages of high strength in high temperature environment, long-term high-temperature operation, deformation, and difficulty in changing the structure, and the nickel-chromium alloy heating wire has good room temperature plasticity and deformation. The fix is simpler.
In addition, the nickel-chromium alloy heating wire has high emissivity, no magnetic property, good corrosion resistance and long service life. A disadvantage of the nickel-chromium alloy heating wire is that the operating temperature cannot reach the level of the previous heating wire. Nickel-chromium alloy heating wire is required to use nickel. The price of this metal is higher than that of iron, chromium and aluminum. Therefore, the manufacturing cost of nickel-chromium alloy heating wire is high, which is not conducive to cost control.
How to know the surface temperature of the heating wire
An important parameter of the heating wire is the surface power. The resistivity is too large, and the surface power is large after a certain current is applied. Therefore, for small power appliances, small diameter and small current are used, but the magnitude of the current is determined by the size of the resistor. The higher the current in the heating wire, the higher the temperature of the heating wire. The smaller the current in the heating wire, the lower the temperature of the heating wire. The length and diameter of the heating wire are calculated.
Look at the color of the heating wire, and change from dark red to bright red as the temperature rises, then turn from near yellow to white to achieve dazzling blue and white. According to this fact, the temperature of the object can be judged from the color of the object's illumination. The heating wire has a high temperature (1100 ° C) and is yellowish red. The heating wire has a higher temperature (1300 ° C) and is yellowish white. A dazzling blue-white (1500 ° C) or above.