Series constant-power heat tracing tape and manufacturing method thereof

Abstract

The invention discloses a series constant-power heat tracing tape and a manufacturing method thereof, which relate to the field of heat tracing tapes. The manufacturing method includes the following steps: (1) preparing metal wire electrodes; (2) preparing bus insulating layers; (3) extruding the bus insulating layers; (4) irradiation cross-linking; (5) preparing an insulating inner sheath and a reinforcing outer sheath; (6) extruding the insulating inner sheath; (7) second irradiation cross-linking; (8) braiding a metal braided shielding layer; and (9) extruding the reinforcing outer sheath.The structure of the series constant-power heat tracing tape is innovative in that the bus insulating layers are added outside the metal wire electrodes, which improves the interface contact resistance and prolongs the service life of the product. The technology is innovative: a co-extrusion process is used to reduce the expansion difference; a manufacturing method of equal-tension normal-structure strands is used to ensure the need for super-thin and large-length extrusion of the bus insulating layers; and second irradiation cross-linking is added to improve the durability of the product. Theseries constant-power heat tracing tape is at a uniform temperature and will not be overheated, is safe and reliable, and is suitable for heat tracing insulation of long-distance pipelines.

Description

technical field [0001] The invention relates to the field of heating cables, in particular to a serial 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 ens...

AI Technical Summary

Problems solved by technology

[0004] Series constant power heating cable is an electric heating product with core wire as heating element, that is, when current passes through the core wire with a certain resistance, the core wire will emit Joule heat. The current is equal throughout the length, and will not reduce the power at the tail end as the length of the parallel heating cable increases, so it is suitable for heat preservation of long-distance pipelines, and it is powered by a power point. It can carry out heat tracing for pipelines up to 3.6 kilometers long. The existing manufacturing methods of this series heating cable are relatively rough, and the materials used are also subject to many uncertain factors, which makes it difficult to control the quality of the heating cable.

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