We know that the application range of electric heating pipes is very wide. The customers we cooperate with are mainly in the chemical industry, medical industry, shipbuilding, aerospace, high-speed rail, train manufacturing industry, and petroleum refining industries. Different items and production procedures bring good heating operation.
The raw materials constituting the electric heating tube are mainly divided into the following types;
Shell material, insulation filling material, resistance wire, nozzle sealing material, lead rod material, lead wire material;
Outer tube material: general stainless steel 304/ 321/ 310S/ 316L/ Incoloy 800 (English)
Insulation filling material: high-purity magnesium oxide powder
Resistance wire: Fe-Cr-Al or Ni-Cr wire
Sealing material of nozzle:
Paint film type (generally there is K-47 type silicone organic paint, which is generally used in foreign countries, and the main domestic use is polyester imide special paint. The main difference between the two materials is the different working temperature, the former The working temperature is 250℃, the other is 200℃)
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Epoxy resins (there are mainly two types, one is the heating and pressurization process, and the other is the non-pressurization heating process. The temperature resistance of this sealing material is generally only about 150 ℃. The material prepared during the sealing must When equipped and used, the insulation performance of the electric heating tube must be well guaranteed before sealing, otherwise, it will be difficult to rework after the epoxy resin seal is hardened and formed.)
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Silicone oil/silicone type (Methyl silicone oil is more commonly used for silicone oil seals. However, silicone oil has a big disadvantage, because it is liquid, it will gradually leak after a period of use, so its sealing performance will become worse. , However, silicone materials can make up for the shortcomings of silicone oil)
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Glass (mainly single glass, enamel glass, mica glass and composite glass)
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Plug type sealing (ceramic plug or silicone rubber plug, the sealing of the plug type sealing material is not very tight, so the water contained in the filling material in the pipe must be removed before sealing)
The function of the sealing material is to seal the outlet of the electric heating tube to ensure the insulation performance of the electric heating tube.
Leading rod: iron
Stainless steel lead: generally high temperature lead, mica lead, ceramic bead lead, metal shell lead and pure nickel lead
In order to let everyone clearly understand the structure of the electric heating tube, you can refer to the diagram below
The above is the content to share with you. If you have any questions about electric heating elements, you can discuss and exchange with us!