Electric heating element assembly
There are many places where heating element are used, and the performance of the products is so avant-garde, so it has been helping many customers to complete their quantitative indicators, and then the data is fixed, but at the time of initial assembly. Still need to plan well, so the specific content is as follows:
1 Electric heating elements used in the form of bare electric heating wire and ceramic (ceramic) plates, tubes, brackets and mica plates for electric heaters, which are supported, insulated and insulated, and directly made of spiral heating wires or linear heating wires. Typical applications for heaters are electric furnaces, hair dryers, heaters and multi-furnaces.
2 Metal tubular electric heating element The spiral electric heating alloy wire is placed in a metal pipe (carbon steel pipe, copper pipe, aluminum pipe, stainless steel pipe and titanium steel pipe), and the powder input machine is filled with magnesium oxide powder with high temperature resistance, insulation and thermal conductivity. It is then "contracted" on the shrinking machine (the aluminum tube is compressed in the hydraulic press). Such electric heating elements or electric heaters composed thereof are currently the most widely used. Typical application examples are electric water heaters, electric ovens, and the like.
3 PTC heating elements and heaters Ceramic PTC heating elements are available in round, rectangular and elongated strips. They can be used alone or in several units. Typical applications include heaters and air conditioner heaters.
4 Far-infrared heating element with far-infrared heating function Metal tubular electric heating element is applied to electric oven, as well as far-infrared heating plate and heating plate. Quartz tube heaters are widely used in heaters and disinfection cabinets
5 Electric heating coils, electric heating plates, electric heating plates, electric heating alloy wires are used as heating materials, mica soft plates are used as insulation materials, and thin metal plates (aluminum plates, stainless steel plates, etc.) are outsourced. Typical applications are for example electric hot water bottles. The metal tubular electric heating element is cast in an aluminum plate, an aluminum plate or welded or mounted on an aluminum plate or an aluminum plate to form an electric heating plate of various shapes and electric heating. Typical applications include rice cookers, electric irons, electric coffee makers, and the like.
6 The heating wire and the electric heating wire of the electric heating wire are used as the heating material, and the outer bread is coated with the insulating material such as PVC and silicon rubber to form the electric heating wire. The coating of the insulating layer is realized on the extrusion machine in the production. In addition to the heating wire, the new heating wire also has a temperature sensing layer and a signal line. Carbon fiber electrothermal materials can be made into textile heating wires, even woven into tapes and cloths for electric heating clothes.
7 The utility of electric heating tube domestic electric heating film is glass electric water heater, heater and so on.
8 Electromagnetic induction heating The electromagnetic induction heating must be achieved by the cooperation of the device that generates the high-frequency alternating electromagnetic field and the heated body that is induced to generate the eddy current. Taking the induction cooker as an example, the device in the furnace includes a transformer and a magnet wire related device, and the panel is made of glass ceramic or glass ceramic, and the panel itself does not generate heat. Two other typical applications for electromagnetic induction heating are IH rice cookers and electric water heaters.
9 microwave heating device is different from electromagnetic induction heating, microwave acts on food, directly causes the food itself to heat up. The microwave generator is mainly composed of a magnetron, a resonant cavity and a waveguide, and related components. Typical application examples are microwave ovens, which can also be applied to electric water heaters.
Resistance heating
The Joule effect of the current is used to convert electrical energy into thermal energy to heat the object. Usually divided into direct resistance heating and indirect resistance heating. The former's power supply voltage is directly applied to the object to be heated, and when a current flows, the heated object itself (such as an electric heating ironing machine) heats up. An object that can be directly resistively heated must be a conductor, but with a higher resistivity. Since heat is generated by the object itself being heated, it is internally heated and has high thermal efficiency. The indirect resistance heating needs to be made of a special alloy material or a non-metal material to generate a heating element, and the heating element generates heat energy, which is transmitted to the object to be heated by radiation, convection and conduction. Since the object to be heated and the heating element are divided into two parts, the type of the object to be heated is generally not limited, and the operation is simple. The material used for the heating element of the indirect resistance heating generally requires a large resistivity and a small temperature coefficient of resistance, and is small in deformation at high temperature and is not easily embrittled. Commonly used are metal materials such as iron-aluminum alloy and nickel-chromium alloy, and non-metal materials such as silicon carbide and molybdenum disilicide. The maximum operating temperature of the metal heating element can reach 1000-1500 °C depending on the type of material; the maximum working temperature of the non-metal heating element can reach 1500-1700 °C. The latter is easy to install and can be replaced by a hot furnace, but it requires a pressure regulating device during operation, and its life is shorter than that of an alloy heating element. It is generally used in high-temperature furnaces, where the temperature exceeds the maximum operating temperature allowed by the heating elements of metal materials, and in certain special occasions.