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Tubular electric heaters are composed of metal tubes, spiral resistance wires, and electrical-grade magnesium oxide powder with good thermal conductivity and insulation, as well as lead terminals. They are widely used for heating liquids, air, etc. Common applications include water heaters, ovens, coffee pots, etc.
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Materials:Common outer tube materials include In800, In840, 304, 316L, 310S, aluminum, copper, low-carbon steel, etc.
Magnesium oxide powder is selected in different specifications according to different usage requirements, including high-temperature powder, medium-temperature powder, etc.
The resistance wire is the heating element, and there are generally two types of materials: Ni-Cr wire and Fe-Cr-Al wire.
Lead terminal materials generally have two types: stainless steel and free-cutting iron.
Sealing materials include: epoxy, silicone, glass, etc.
Process:The heating tube is made by inserting electric heating wires into the outer tube (
carbon steel tube, titanium tube, stainless steel tube, copper tube), filling the gaps with magnesium oxide powder that has good thermal conductivity and insulation, and then reducing the tube diameter. After heat treatment (some tubes do not require it), it is processed into various shapes as required by the user. It has the characteristics of simple structure, high thermal efficiency, good mechanical strength, and good adaptability to harsh environments. It can be used for heating various liquids and acid-base salts, and is also suitable for melting low-melting-point metals.
The application range of tubular heaters: suitable for heating air, oil, water, chemical media, hot pressing molds, melting salts, alkalis, and low-melting-point alloys. It has the characteristics of high thermal efficiency, long service life, high mechanical strength, easy installation, safety, and reliability.
Classification of tubular heaters by shape: According to different shapes, heating tubes can be divided into straight single-end heating tubes, straight double-end heating tubes, U-shaped heating tubes, W-shaped heating tubes, special-shaped heating tubes, and spiral heating tubes.
