Light foam sandwich composite material insulating rod and preparation methods thereof

Abstract

The invention discloses a light foam sandwich composite material insulating rod. The insulating rod comprises an insulation cylinder and sandwich rods filled in the insulation cylinder. The insulating rod is characterized in that the insulation cylinder is made of epoxy resin based composite materials; the sandwich rods are made of light foam materials; the inner wall of the insulation cylinder and the outer walls of the sandwich rods are tightly fit; and the epoxy resin materials forming the insulation cylinder matrix are filled in the pores of the outer walls of the sandwich rods. The invention also provides three preparation methods of the insulating rod. The first preparation method comprises the steps of firstly forming a light foam sandwich rod, then winding reinforcing materials and impregnating the obtained product in epoxy resin glue solution. The second preparation method comprises the steps of firstly forming a light foam sandwich rod, directly winding pre-impregnated reinforcing materials and then curing the obtained product to obtain the product. The third preparation method comprises the steps of forming a hollow light foam sandwich cylinder, then winding reinforcing materials and spraying epoxy resin glue solution on the reinforcing materials, curing the obtained product and then foaming and filling the hollow parts to obtain the product. The insulating rod has the advantages of simple preparation process, light finished product mass, high bending resistance, good mechanical property, low cost, no hidden danger of interface breakdown and the like.

Description

technical field [0001] The invention relates to the field of composite insulators for power equipment, in particular to an inner insulating composite material rod of a pillar composite insulator and a preparation method thereof. Background technique [0002] Post insulators are key components for power equipment such as high-voltage isolating switches, busbar supports, and reactor supports, and most of them are ceramic products at present. This kind of ceramic post insulator is a high-energy-consuming product, which is heavy, fragile, low-seismic ability, and there is a risk of explosion during operation. Composite post insulators have appeared in recent years, but the bending performance of composite post insulators is not comparable to that of porcelain post insulators. In order to solve the problem of bending resistance and bending offset of composite post insulators, people mostly use large-diameter solid non-alkali glass fiber reinforced epoxy resin-based composite mat...

AI Technical Summary

Problems solved by technology

Using this method will bring additional work such as sealing, monitoring, and gas supply, and the reliability of the insulator is difficult to guarantee, and there are potential safety hazards

For this reason, there is currently still a method of filling the interior with a liquid or solid insulating medium, but the liquid insulating medium also has problems such as sealing difficulties and high manufacturing costs, while the solid insulating medium has the problem of dealing with the joint surface between the filler and the inner wall of the insulating cylinder. Improper handling may lead to internal breakdown

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