Composite electric heating tube and preparation method

Abstract

The invention discloses a novel composite electric heating tube and a preparation method thereof. The electric heating tube includes a stainless steel empty tube, a spiral heating band and a superconducting liquid; the spiral heating band is fixedly arranged in the stainless steel empty tube; the stainless steel empty tube is filled with the superconducting liquid; the spiral heating band includes a first heating wire, a second heating wire, a third heating wire, a first metal foil, a second metal foil and an insulating spacer; the second heating wire is arranged between the insulating spacer and the first metal foil; the first metal foil and the second metal foil are wound to be spiral; the first heating wire, the second heating wire and the third heating wire are respectively connected with a first power supply conductor, a second power supply conductor and a third power supply conductor; and the first power supply conductor, the second power supply conductor and the third power supply conductor independently control the heating power of the first heating wire, the second heating wire and the third heating wire respectively.

Description

technical field [0001] The invention belongs to the technical field of electric heating, and in particular relates to a novel composite electric heating tube and a preparation method thereof. Background technique [0002] Electric heating tube (also known as electric heating rod) is an electrical component that converts electrical energy into heat energy. It is a key component in the field of electric heating and is widely used in home appliances, automobiles, textiles, food, machinery manufacturing, power plants, water heating appliances, etc. field. The existing electric heating tube uses a metal tube as the shell, and spiral electric heating alloy wires (nickel-chromium, iron-chromium alloy) are evenly distributed along the central axis of the tube. The granular composition of magnesia sand, the two ends of the nozzle are sealed with silica gel or ceramics. [0003] Magnesia sand is a solid with a high melting point, which conducts heat but does not conduct electricity....

AI Technical Summary

Problems solved by technology

In the context of the current national and social requirements for energy saving and environmental protection, magnesia sand, which is used as a heat transfer medium for electric heating pipes, has become increasingly unable to meet actual needs.

[0004] In addition, the electric heating tubes in the prior art use the heating wire as the heating element, and the heating wire is usually a complete one and is wound around the outer periphery of the supporting rod or tube. This kind of electric heating tube cannot precisely control the heating temperature. Moreover, once the electric heating wire breaks, the entire electric heating tube will not work normally, and the entire electric heating tube must be replaced immediately, causing a lot of inconvenience to the user.

Images