Parallel constant-power heat tracing band and manufacturing method thereof

Abstract

The invention discloses a parallel constant-power heat tracing band and a manufacturing method thereof, and relates to the field of a heat tracing band. The manufacturing method comprises the following steps of 1) preparing a metal wire electrode; 2) preparing a bus insulating layer; 3) performing extrusion of the bus insulating layer; 4) performing irradiation cross linking; 5) performing heatingbody extrusion and heating element winding; 6) preparing an insulating inner sheath and a reinforced outer sheath; 7) performing extrusion of the insulating inner sheath; 8) performing secondary irradiation cross linking; 9) weaving a metal woven shielded layer; and 10) performing extrusion of the reinforced outer sheath. By virtue of structural innovation of adding the bus insulating layer on the outer layer of the metal conductive electrode, the interface contact resistance is improved and product service life is prolonged; by virtue of process innovation of adopting a co-extrusion processmethod, expansion difference is lowered; by adopting a manufacturing method of an equal-tension regular structure stranded wire, the requirements of ultra thin appearance and high length extrusion ofthe bus insulating layer can be ensured; by adding the step of one time of irradiation cross linking, product durability is improved; and the parallel constant-power heat tracing band is uniform and stable in heating, suitable for the majority of environments, and resistant to water and oil.

Description

technical field [0001] The invention relates to the field of heating cables, in particular to a parallel constant power heating cable and a manufacturing method thereof. Background technique [0002] Self-limiting temperature heating cable (hereinafter referred to as heating cable) is also called self-regulating electric heating cable or temperature-controlled heating cable. It is a strip-shaped temperature-limiting tracer whose electric heating power is self-adjusting with the system temperature. The heating element of the heating cable is a layer of conductive plastic with a positive temperature coefficient that is uniformly extruded between two parallel metal busbars. Conductive plastic is connected across two parallel busbars to form a parallel circuit resistance heating element, which can automatically adjust the output power and the released heat according to the temperature change of the heated system, so as to achieve the purpose of automatic temperature limit and e...

AI Technical Summary

Problems solved by technology

[0004] Parallel constant power heating cable is an electric heating product with a core wire as a heating element. The heating elements of this heating cable are connected in parallel, and its heating element is wound on the conductor bus. The length of the heating element is determined by the heating element. The distance from the conductor busbar is determined, and the parallel structure determines that it can be cut to any length and can be installed on site with special accessories to seal the tail. Uncertain factors make it difficult to control the quality of heating cables

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