Resistance Heating CoilDaru Electric recommends for you
Converting electrical energy into thermal energy to heat objects. It is a form of electrical energy utilization. Compared with general fuel heating, electric heating can achieve higher temperatures (such as arc heating, temperatures can reach over 3000°C), and it is easy to achieve automatic temperature control and remote control. Vehicle electric heating cup
The heated object can be maintained at a certain temperature distribution as needed. Electric heating can generate heat directly inside the heated object, thus having high thermal efficiency and fast heating speed. According to the requirements of the heating process, it can achieve uniform heating of the whole or local heating (including surface heating), and it is easy to achieve vacuum heating and controlled atmosphere heating. During the electric heating process, less waste gas, residue, and smoke are produced, keeping the heated object clean and not polluting the environment. Therefore,
electric heating is widely used in production, scientific research, and experiments. Especially in the manufacture of single crystals and transistors, mechanical parts and surface hardening, smelting of ferroalloys, and manufacture of artificial graphite, electric heating methods are used.
Classification by Working Mode
According to different electrical energy conversion methods, electric heating is usually divided into resistance heating, induction heating, arc heating, electron beam heating, infrared heating, and dielectric heating.
Resistance heating coils use the Joule effect of electric current to convert electrical energy into thermal energy to heat objects. It is usually divided into direct resistance heating and indirect resistance heating. In the former, the power supply voltage is directly applied to the heated object. When current flows, the heated object itself Electric heating ironing machine
generates heat. Objects that can be directly resistance heated must be conductors but have high resistivity. Since heat is generated inside the heated object itself, it is internal heating with high thermal efficiency. Indirect resistance heating requires special alloy materials or non-metallic materials to make heating elements, which generate heat and transfer it to the heated object through radiation, convection, and conduction. Since the heated object and the heating element are separated, the type of heated object is generally not restricted, and operation is simple.
The materials used for heating elements in indirect resistance heating generally require high resistivity, low temperature coefficient of resistance, small deformation at high temperatures, and not easy to embrittle. Commonly used are metal materials such as iron-chromium-aluminum alloys and nickel-chromium alloys, and non-metallic materials such as silicon carbide and molybdenum disilicide. The maximum working temperature of metal heating elements can reach 1000-1500°C depending on the material type; the maximum working temperature of non-metallic heating elements can reach 1500-1700°C. The latter is easy to install and can be replaced while the furnace is hot, but it requires a voltage regulating device during operation and has a shorter lifespan than alloy heating elements. It is generally used in high-temperature furnaces, places where the temperature exceeds the maximum working temperature allowed for metal heating elements, and some special occasions.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
