Glass fiber mica alloy heat generating wire cable

Abstract

The cable includes at least a heating wire, an insulation layer outside the heating wire, and shielding layer covering insulation layer. The characters are as follows. The heating wire composed of metal conductor is connected to power line. The insulation layer consists of inner insulation layer covering the heating wire and outer insulation layer covering shielding layer. The inner insulation layer includes three layers: fiberglass braid as first layer, mica tape braid as second layer, and fibreglass braid as third layer. The outer insulation layer is made from fibreglass braid or Teflon as well as F46 (tetrafluoroethylene-hexafluoropropylene copolymer) and fluorine rubber. The heating wire is made from constantan wire, manganese copper wire, Cr20Ni80 wire etc. other alloy resistance wire as metal conducting wire. The heating wire also includes athermic-conducting wire, which is between the heating wire and power wire.

Description

technical field [0001] The invention relates to an electric heating device, in particular to a glass fiber mica alloy heating cable applicable to various industries for electric heating. Background technique [0002] Among the electric heaters in the prior art, there are many metal electric heating tubes. The general metal electric heating tubes use metal wires such as iron, chromium and aluminum with high resistance as heating elements, and use magnesium oxide powder as insulating material, and use iron, copper, Stainless steel, metal titanium, etc. are used as the outer tube, so the metal electric heating tube is a kind of rigid electric heating device, which has a high heating temperature, usually the temperature can reach 800 ° C ~ 1000 ° C, so the metal electric heating tube has high temperature zone heating It has the characteristics of strong advantage and weak heating advantage in low temperature area, and has high heating intensity (heating intensity can reach 1~3KW...

AI Technical Summary

Problems solved by technology

[0004] 1. Because the metal electric heating tube in the prior art is a rigid electric heating device, not only its minimum turning radius is large, the shape of the product cannot be changed after forming, and metal processing is difficult, so it is not suitable for long-distance pipeline heating

[0005] 2. Due to the influence of the heating wire through the pipe and the filling of the magnesium oxide powder in the existing metal electric heating pipe, it is difficult to make the length longer, and it is very difficult to have a length greater than 4 meters, so it is not suitable for large-area heating

[0006] 3. Due to the structural limitation of the metal electric heating tube in the prior art, the temperature difference between the heating wire inside the electric heating tube and the object to be heated outside the tube is large, and the heating temperature of the heating wire can reach 800 ° C ~ 1000 ° C, in the medium and low temperature area of ​​≯ 500 ° C In the case of heating, the heating inertia is large, so the temperature control characteristics are poor

[0007] 4. Due to the concentricity of the heating wire of the metal electric heating tube in the prior art when it is worn through the tube, and the concentricity when the tube is bent, it is affected by the density of magnesium oxide powder on different sections when filling the tube and forming. , Affected by the manual processing factors of the staff, the quality is not easy to stabilize, the temperature conduction in the tube is not easy to be uniform, and the metal resistance wire is easy to oxidize when working in a high temperature area above 800 °C for a long time, which makes the electric heating tube easy to burn out or strike. Wear, and not suitable for working in flammable and explosive places, so the safety performance is poor

[0008] 5. Since the metal electric heating tube in the prior art uses a metal tube as the shell, and the metal material is not resistant to acid, alkali and chemical solvent corrosion, even if a titanium electric heating tube is used, the corrosion resistance is limited and the service life is short

from figure 2 and Figure 4 It can be seen that the heating wire 4 is welded on the transmission wire 1 section by section to form an electric heating belt, so the production is very troublesome.

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