Electric heating tube applicable to liquid-phase heat conduction medium

Abstract

The invention discloses an electric heating tube applicable to a liquid-phase heat conduction medium. The electric heating tube comprises a spiral heating wire (1), a metal tube shell (2), leads (5) and sealing insulating shells (3), wherein the leads (5) are electrically connected with two ends of the spiral heating wire (1); the sealing insulating shells (3) are column-shaped and used for surrounding the connecting parts of the leads (5) and the spiral heating wire (1); the spiral heating wire (1) is positioned inside the metal tube shell (2); a part of each sealing insulating shell (3) is positioned inside the metal tube shell (2), and the other part of the sealing insulating shell (3) is positioned outside the metal tube shell (2); the metal tube shell (2) and the sealing insulating shells (3) are in sealed connection; a cavity for containing the liquid-phase heat conduction medium is formed between the inner wall of the metal tube shell (2) and the spiral heating wire (1); a temperature testing tube (7) is arranged on the outer side of the metal tube shell (2). By adopting the electric heating tube disclosed by the invention, a component with a liquid phase can be adopted as a heating medium.

Description

technical field [0001] The invention relates to the technical field of electric heating, in particular to an electric heating tube suitable for a liquid-phase heat-conducting medium. Background technique [0002] Electric heating tube (also known as electric heating rod) is an electrical component that converts electric energy into heat energy. It is a key component in the field of electric heating. Other heating devices and many other fields that need heating. The existing electric heating tube uses a metal tube as the shell, and spiral electric heating alloy wires (nickel-chromium, iron-chromium alloy) are uniformly distributed along the central axis of the tube, and the gap in the tube is filled with a medium with good insulation and thermal conductivity—magnesia or Granular composition containing magnesia sand, both ends of the nozzle are sealed with silica gel or ceramics. [0003] The Chinese patent document with the publication number CN103442465A discloses an elect...

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Problems solved by technology

[0006] The existing electric heating tube is generally filled with solid particles such as magnesia sand as the heat transfer medium. If the heat transfer medium with liquid is filled, it will cause problems such as liquid leakage and metal corrosion.

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