Preparation method of hollow composite insulator

Abstract

The invention discloses a preparation method of a hollow ceramic composite insulator, which comprises the following steps: using a core rod with an annular convex step and an annular expansion part as an inner core, and using blend fiber cloth of glass fiber and modified aromatic polyoxadiazole fiber as a wrapping material on the surface of the core rod for surface wrapping; and then performing vacuum impregnation on the wrapping part by using an epoxy resin material to obtain a resin ring sleeve coated with the corresponding wrapping material, then performing pressure injection molding of a silicone rubber umbrella skirt on the outer surfaces of the resin ring sleeve, the expansion part and the annular convex step, and taking the core rod on which the silicone rubber umbrella skirt is molded as an insulator. And sleeving the hardware fitting of which the surface is subjected to anodic oxidation treatment on the end surfaces of the two ends of the core rod, and injecting glue, so that the hardware fitting and the core rod are glued into a whole to obtain a hollow composite insulator finished product. The high-voltage cable has better overall structural strength and stability, is good in anti-seismic performance and explosion-proof performance, can meet the requirements of dielectric strength and stain resistance, and is particularly suitable for the field of high voltage.

Description

technical field [0001] The invention relates to insulating parts in the technical field of electrical equipment, in particular to a preparation method of a hollow composite insulator. Background technique [0002] As one of the key components in high-voltage power grids and power transmission and transformation lines, the performance of insulators directly affects the safe operation of high-voltage power grids. At present, the insulators used in the market mainly include composite insulators and pure porcelain insulators. The production cost of pure porcelain insulators is low and the application is wide. However, due to the characteristics of the material, the stability is relatively poor. Raw materials and increased product wall thickness to increase safety, and porcelain insulators still have the problems of low pollution resistance and heavy weight, which need to be improved by spraying vulcanized silicone rubber or other pollution-resistant coatings on the surface of th...

AI Technical Summary

Problems solved by technology

In the prior art, there are two types of core rods: glass fiber reinforced plastic core rods or ceramic core rods: although ceramic core rods have good chemical and thermal stability and almost no aging and deterioration characteristics, they still cannot solve the problem that ceramic core rods are prone to bursting. The problem of failure; while the FRP mandrel has good stability, good mechanical properties, and electrical breakdown resistance, but has poor bonding performance with the shed made of silicone rubber. In the prior art, the adhesion between the shed and the mandrel The jointing process is not very perfect, so that the interface between the shed and the mandrel will peel off when the FRP mandrel is under pressure, which will affect the dielectric strength and mechanical strength of the product, and will also affect its electric shock resistance Wear performance, especially in the high voltage field, the above problems will be more prominent because of the working environment

Images