Novel composite insulator and production process thereof

Abstract

The invention relates to the technical field of composite insulators, in particular to a novel composite insulator and a production process thereof. The novel composite insulator includes a mandrel, asilicone rubber sheath and an umbrella skirt. The silicone rubber sheath fixedly sleeves the outer surface of the mandrel by extrusion. The silicone rubber sheath includes a sheath body, and four raised strips extend from the outer surface of the sheath body in the form of a cross. The umbrella skirt is formed on the outer surface of the silicone rubber sheath by injection. Compared with the prior art, the silicone rubber sheath is fixed on the outer surface of the mandrel by extrusion, and the umbrella skirt is fixed on the outer surface of the silicone rubber sheath by injection, so that the bonding between the silicone rubber sheath and the mandrel is firmer and more aging-resistant; and multiple interface generation points are reduced, so that moisture, acid and alkali are prevented from infiltrating into the mandrel, and the use and operation risk of the product is greatly reduced. The application also provides a production process of the composite insulator.

Description

technical field [0001] The invention relates to the technical field of composite insulators, in particular to a novel composite insulator, and also to a production process of the composite insulator. Background technique [0002] Organic composite insulators, as a major electrical component in power grid operation, play an important role in power transmission and electrified railway construction. The existing organic composite insulation production, a total of two processes. One is the overall injection molding process, and the other is the extrusion sheathing and stringing umbrella process. These two processes have their own insurmountable shortcomings in the production of organic composite insulators [0003] The overall injection molding process is to apply a layer of primer (silicone rubber coupling agent) on the surface of the organic composite insulator skeleton material mandrel and connecting hardware, and then inject the insulator shed sheath in a rubber injection m...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: when the overall injection molding is performed, the injection machine needs a very large injection pressure to fill the mold cavity with silicone rubber. When the silicone rubber flows under high pressure in the mold cavity, the primer on the surface of the mandrel metal fittings will be washed away, resulting in interface bonding. Not strong, easy to cause poor insulation inside the product

The obvious disadvantages of this process product are: first, the material for bonding the shed and the silicone rubber sheath is room temperature vulcanized silicone rubber, and room temperature vulcanized silicone rubber is different from heat vulcanized silicone rubber in terms of mechanical properties, electrical properties and aging properties. There is a huge gap; second, the room temperature vulcanized silicone rubber is used to bond the shed and the sheath, which adds two layers of connection interface to the product; Afterwards, it is easy to fall, and it is easy to be broken by strong wind in the wind area; fourth, because the sheaths are inserted into the sheath one by one, the connection between each sheds leaves interfaces on the insulating surface. Each interface is a hidden danger buried in the insulator

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