What are the basic structures of electric heating tubes?
Regarding the structure of the electric heating tube, many friends do not quite understand it. Yancheng Laiyuan Electric Equipment Co., Ltd. specializes in the production and development of electric heating tubes. I will show you a clear introduction to the structure of electric heating tubes.
1. Resistance wire: Ni80Cr20 etc.
2. Outer tube: copper tube, copper-plated tube, stainless steel heating tube, aluminum tube, quartz tube, etc.
3. Filler: electrical grade magnesium oxide powder.
4. Cold needle: stainless steel, nickel-plated iron, etc.
5. Sealing materials: ceramics, silicone glass, RTV glue, silicone oil, etc.
The different names are
①Metal sheath: the main ones are stainless steel (sus201.304, 321.316, 310, etc.), copper, carbon steel (iron). Choose different metal jacket pipes according to different working heating pipe environments.
②Insulator: white porcelain head is generally used
③Sealing material: The main purpose of the sealing material is to make the insulating filling material difficult to absorb water vapor in the environment, and to ensure that the electric heating tube has a good heating tube insulation performance. Commonly used sealing materials
The main materials are: sealing plugs made of paint film, silicone organic paint, epoxy resin, and silicone rubber.
④ Leading rod: Iron is generally used, because iron transfers heat faster. Of course, general customers have special requirements. Stainless steel lead rods can be used, but you need to ask our salesperson.
⑤ Filler: Generally, there are magnesia powder and quartz sand. We have never used the heating tube quartz sand to produce electric heating tubes. The cheap electric heating tubes on the market all contain quartz sand. The magnesium oxide powder in the electric heating tube is all high-temperature modified magnesium oxide powder used, and the electric heating tube made of modified magnesium oxide powder is moisture-proof.
⑥Electric heating wire: mainly iron-chromium-aluminum and nickel-chromium alloy wire. Iron-chromium-aluminum is cheaper. Generally, iron-chromium-aluminum alloy wires are used in electric heating tubes unless otherwise specified.
Nickel-chromium alloy wire is more expensive. The difference between the two wires: the working temperature of iron-chromium-aluminum alloy materials can reach 1400°C, which is enough to meet the needs of electric heating tubes. However, Ni-Cr wire has good flexibility and good oxidation resistance, while Fe-Cr-Al wire is more brittle.