Large wire diameter special insulating conductor and manufacture process thereof

Abstract

The invention belongs to the field of nuclear grade special insulating conductor, in particular to a large wire diameter special insulating conductor and a manufacture process thereof, which aim to solve the problems that the prior extruding technology cannot realize insulation on large wire diameter conductors, and the prior insulating conductor has reduced insulativity after long-term use. The large wire diameter special insulating conductor consists of a large wire diameter inner conductor (1) and an insulating layer, wherein the inner conductor is made of a copper material; the insulatinglayer adopting high performance engineering plastics is attached to the conductor. The process for manufacturing the large wire diameter special insulating conductor mainly comprises five steps, namely aligning the inner conductor, processing the surface of the inner conductor, fusing an insulating material, coating the insulating material on the conductor, and cooling and solidifying. The conductor and the process have the advantages of excellent environment adaptability, long service life, excellent insulating performance, good surface quality, feasible die design, simplicity and convenience, even size of the insulating layer, no uneven internal stress generation, and fatigue life improvement.

Description

technical field [0001] The invention belongs to the field of nuclear-grade special insulated conductors, and in particular relates to a large-diameter special insulated conductor and a production process thereof. Background technique [0002] Nuclear grade special insulated conductor is a special insulated conductor specially used in nuclear environmental conditions. At present, the common nuclear grade special insulated cables mainly include fluorine-40, silicone rubber, polyethylene, ethylene propylene rubber insulated cables and polyimide film wrapped-high temperature sintered insulated cables. These insulated cables have the following disadvantages respectively: [0003] (1) The main insulation materials of insulated cables such as fluorine-40, silicone rubber, polyethylene, and ethylene-propylene rubber do not have flame retardancy themselves, and a certain amount of flame retardants need to be added during manufacture. Due to the addition of flame retardants, the mec...

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Problems solved by technology

Due to the addition of flame retardants, the mechanical properties, electrical properties and radiation resistance of the insulating layer are reduced; in addition, the acid and alkali corrosion resistance and high temperature hydrolysis resistance of the above insulated conductors are weak

[0004] (2) Polyimide film wrapping-high temperature sintered insulated cable is a widely used nuclear-grade insulated cable. It has good radiation resistance and high temperature resistance, but its high temperature hydrolysis resistance is poor. In use, especially in the LOCA environment of nuclear power plants, the insulation performance will be reduced, resulting in quality accidents

[0005] Aiming at the problem that polyimide film wrapping-high temperature sintering special insulated conductor cable cannot withstand high temperature and hydrolysis, Chinese patent CN2904214Y published "A Multifunctional Cable / Wire", CN2807413Y published "High Temperature and High Temperature Water Vapor Insulated Wire" " and CN1499537A published "high temperature resistant and high temperature water vapor insulated wire and its production method" have adopted special engineering plastics PEEK as the insulation layer material of the wire, but these patents have in common all the extrusion insulation for small wire diameter conductors

For conductors with large wire diameters, such as conductors with a size between 6 and 40mm, due to the poor flexibility of the conductors and their heavy weight, it is impossible to use the existing extrusion molding production line and the interface mold to achieve large wire diameters. insulation of conductors

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