The voltage range of each country is different (100V-440V), the power range of the electric heating tube is different (100W-5000W), the use environment is different, the diameter of the electric heating tube is different, etc., which requires the design requirements and manufacturing process of the resistance wire of the product to be higher and higher. In China, although the electric heating tube has been produced for 20 years, but the electric heating tube manufacturing technology is still very backward, many products with small rated voltage but large rated power due to the limitation of the production process, so that the diameter of the single resistance wire is large so that the strength of the resistance wire is too high, resulting in the wire winding machine can not be wound, the welding place of the resistance wire ring and the lead rod during the powder loading process and shrinking process is easy to pull off, resulting in the problem that the length of the electric heating tube tube is more than 1500mm can not be manufactured; For the pipe selected for household electric heating tube (C>6. 2 mm, 6. 5 mm, 8. 0 mm, 8. 5 mm), für Produkte mit kleiner Nennspannung und großer Nennleistung, um die Widerstandsanforderungen zu erfüllen, wenn eine einzelne Widerstandsdrahtstruktur verwendet wird, der Durchmesser des Widerstandsdrahts erhöht werden muss, was zu einer übermäßigen Biegefestigkeit des Widerstandsdrahts führt, und der Wicklungsabstand zwischen dem Außendurchmesser des Widerstandsdrahtrings und der Innenwand des elektrischen Heizrohrs zu kurz ist, was die elektrische Leistung ernsthaft beeinträchtigt der elektrischen Heizröhre.
