Composite insulator

Abstract

The invention discloses a composite insulator. The composite insulator comprises a core rod, a sheath and a connecting piece, wherein the sheath is coated on the outer side of the core rod; the connecting piece is connected with the core rod and the sheath; the sheath is made of high-temperature vulcanized silicon rubber; the connecting piece comprises a body and a bump which is arranged by surrounding the outer wall of the body; the body comprises at least one wedged groove which is circularly arranged on the outer wall of the body; and the sheath is coated on the outer walls of the bump andthe wedged groove. In the composite insulator, room-temperature vulcanized silicon rubber is not used as a sealant, and the high-temperature vulcanized silicon rubber is adopted. Since the high-temperature vulcanized silicon rubber is aging-resistant, the sealing effect of the composite insulator is difficult to damage by erosion of an external environment when the composite insulator is exposed outdoors and even in certain severe environments. Meanwhile, the sheath cannot be stripped off from encapsulated rubber on a hardware tool and the core rod by an external force factor produced during transportation, mounting and maintenance by using the buckling effect of the bump and the wedged groove on the sheath, so that the sealing failure cannot be caused.

Description

technical field [0001] The invention relates to a composite insulator, in particular to a composite insulator with good sealing performance. Background technique [0002] With the development of the power industry, especially the needs of UHV power transmission and transformation, various performance requirements for composite insulators, such as weight, anti-pollution flashover capability, convenient manufacturing and maintenance, and sealing performance, are becoming more and more stringent. Generally, composite insulators include the following parts: a core rod, a sheath covering the outside of the core rod and sheds, and connectors arranged at both ends of the core rod and connected to the core rod and the sheath. It can be understood that, when the composite insulator is a line insulator, the connector may be a metal fitting. When the composite insulator is a post insulator, the connecting piece may be a flange. During the use of the above-mentioned composite insulato...

AI Technical Summary

Problems solved by technology

[0004] However, composite insulators are usually exposed outdoors, especially in some harsh environments, the erosion of the room temperature vulcanized silicone sealant by the external environment will destroy its sealing effect

In addition, for the double sealing of the sealing ring and vulcanized silicone, if the adhesive force between the silicone rubber and the connecting piece is too small, the room temperature vulcanized silicone sealant 4 may be released from the sheath under the external force factors generated during transportation, installation and maintenance. 2 and fittings 3 are peeled off, and gaps are likely to appear, resulting in seal failure

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