The heating wire is the most common type of heating element, and its function is to generate heat after being energized, and convert electrical energy into heat energy. The application range of electric heating wire is very wide. Many common electric heating equipments use electric heating wire as heating element. Therefore, electric heating wire has applications in medical, chemical, electronics, electrical, metallurgical machinery, ceramic glass processing and other industries.
1, the working principle of electric heating wire
The working principle of the heating wire is the same as that of other metal heating elements, and it is the electric heating phenomenon after the 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, the type of electric heating wire
The type of heating wire is divided according to the chemical element content and the 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 heating wire
The advantage of the iron-chromium-aluminum alloy heating wire is that the operating temperature is high. The experimental results show that 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
The advantage of nickel-chromium alloy heating wire is high strength in high temperature environment, long-term high temperature operation is not easy to deform, and it is not easy to change the structure, and the nickel-chromium alloy heating wire has good room temperature plasticity, and the repair after deformation is relatively simple. 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.
Delivery status
1. The wire and the disk element are supplied in white or oxidized color.
2. In addition to special requirements, strips are generally supplied in an oxidized color after annealing.
3. After the filament and the flat wire are annealed by the protective gas, they are supplied in a bright and soft state.
Product packaging
1. Wire and strip are wrapped in baling cloth and supplied in rolls.
2, filament and flat wire, plastic supply around the shaft.
Precautions
1. The heating wire should be designed according to the power wiring method, reasonable surface load, and correct wire diameter;
2. The electric furnace wire should be inspected thoroughly before installation, remove the ferrite, carbon deposit, and the hidden danger of contact with the electric furnace to avoid short circuit, so as to prevent the wire from breaking down;
3. The electric furnace wire should be correctly connected according to the designed wiring method during installation;
4. Before using the electric furnace wire, check the sensitivity of the temperature control system to prevent the temperature from malfunctioning and cause the electric furnace wire to burn.