End seal structure for wall bushings

Abstract

The invention relates to an end sealing structure of a through-wall casing pipe so as to solve the problem that in the prior art, only one-time sliding sealing is adopted between a conducting rod of athrough-wall casing pipe and a connecting flange of the end of the casting pipe and thus the sealing effect is poor. The connecting flange is covered with a sealing cover matched with the connectingflange in a sealed mode, the sealing cover is provided with a sealing cover penetrating hole for allowing a conducting rod or a conducting lead-out rod connected with the end of the conducting rod topenetrate out, and the conducting rod or the conducting lead-out rod is matched with the sealing cover penetrating hole in a slidably sealed mode. The conducting rod moves in the axial direction of the conducting rod. The conducting rod and the connecting flange are matched in a slidably sealed mode to achieve primary sealing, the sealing cover is arranged on the connecting flange in sealed and matched modes, and the conducting rod or the conducting lead-out rod and the sealing cover are subjected to secondary sliding sealing, so that the sealing effect is reinforced. If an insulation medium in a containing cavity is in a high-pressure state, the primary sliding sealing effect is poor, the insulation medium leaks into the sealing cover to reduce the pressure, and the secondary sliding sealing effect can achieve the good sealing effect accordingly.

Description

technical field [0001] The invention relates to an end sealing structure of a wall bushing. Background technique [0002] UHV DC transmission is the best technical solution for large-scale long-distance transmission of new energy and other power, and is an important force to promote the development of low-carbon strategic emerging industries. Before 2020, my country is expected to build 23 UHV DC projects, and the market prospect is very broad. UHV DC wall bushing is an important part of UHV DC projects, and the market demand is relatively large. At present, the DC wall bushings of ABB, ALSTOM (Alstom) and some domestic manufacturers all use pure SF 6 The technical scheme of the gas wall casing, the casing is coaxially passed through the conductive rod, and the casing is filled with pure SF 6 The gas is used to prevent the breakdown of the conductive rod and the bushing. This kind of bushing will be the mainstream development direction of the UHV DC wall bushing in the fut...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sealing structure for the end of the wall bushing, so as to solve the problem of sealing caused by only one sliding seal between the conductive rod of the wall bushing and the connecting flange at the end of the bushing in the prior art. less effective problem

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