Adaptable special-shaped liner tube

Abstract

An adaptable special-shaped liner tube is composed of a steel liner tube 1, solid particulate matters 2 and end covers 3. The stiffness of the steel liner tube 1 is much greater than the deflection ofa lined pultrusion glass fiber tube 4, the diameter of the steel liner tube 1 is slightly smaller than the inner diameter of the lined glass fiber tube, and a gap for the solid particulate matters 2is reserved. Both ends of the steel liner tube 1 are provided with a bolt 1-1 and a bolt 1-2 so as to be connected with the end covers 3. A circular groove with the identical diameter and wall thickness as the glass fiber tube is machined in each end cover 3, and a filling hole 3-1 is formed in one end cover. The gap between the outer diameter of the steel liner tube 1 and the inner diameter of the lined glass fiber tube 4 is filled with the solid particulate matters 2. The solid particulate matters 2 transmit pressure on the tube wall of the glass fiber tube 4 onto the tube wall of the steelliner tube 1, so as to offset pressure on the glass fiber tube 4 when silicone rubber is being vulcanized. The adaptable special-shaped liner tube ingeniously combines the stiffness of the steel linertube with the deformability of the solid particulate matters, and solves the two key technical problems of pressure bearing and straightening of the pultrusion glass fiber tube, so that the pultrusion glass fiber tube can be widely used in the manufacturing of hollow pillar composite insulators.

Description

technical field [0001] The invention relates to the technical field of manufacturing high-voltage, ultra-high-voltage and ultra-high-voltage hollow composite insulators in power systems. Background technique [0002] During the manufacture of hollow composite insulators, a liner must be lined inside the epoxy resin glass fiber tube (hereinafter referred to as the glass fiber tube) to withstand the huge pressure transmitted from the outer wall of the glass fiber tube when the silicone rubber sheath is vulcanized. If the liner is not lined, the fiberglass tubing will definitely fracture. [0003] The widely used liner is precision-processed from a rigid seamless steel pipe, and its outer diameter closely fits the inner diameter of the glass fiber tube. This kind of steel liner requires the circularity, coaxiality and The degree must be without any deformation. Therefore, it is only suitable for wound glass fiber tubes that have been turned. Winding glass fiber tube has no a...

AI Technical Summary

Problems solved by technology

However, the pultrusion tube is limited by the production process. When the product exceeds a certain length, it will be slightly bent. Acceptance Criteria", but this deformation prevents the pultruded fiberglass tube from being lined with a steel liner

We have filled high-pressure gas and liquid into the glass fiber tube to offset the pressure of the glass fiber tube when vulcanizing silicone rubber, but found that two major problems cannot be solved: 1. The time for the gas or liquid in the glass fiber tube to pressurize and depressurize And the rate is inconsistent with the time and rate of the thermal expansion pressure of the silicone rubber outside the glass fiber tube, resulting in the pultruded glass fiber tube being either cracked by external pressure or burst by internal pressure; 2. Use liquid or gas as the steel liner and glass fiber Filler between tubes, does not straighten bent pultruded tubes

Therefore, pultruded glass fiber tubes have been difficult to apply to hollow post composite insulators

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