Peephole plug, air cylinder plugging structure and use method of peephole plug and air cylinder plugging structure

Through the dynamic compensation of magnetic repulsion force and mechanical positioning design of the carbon ring seal structure, the seal failure and maintenance complexity of gas turbine peepholes in high temperature and high pressure environments is solved, and efficient and reliable peephole sealing is achieved, reducing maintenance costs.

CN120251338APending Publication Date: 2025-07-04DONGFANG TURBINE CO LTD
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Patent Information

Application Number
CN202510538727.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-27
Publication Date
2025-07-04

AI Technical Summary

Technical Problem

The traditional gas turbine peephole sealing structure cannot adapt to the expansion differences between the double-layer cylinders, resulting in seal failure or structural damage, and the maintenance is complex and costly, especially in high-temperature and high-pressure environments.

Method used

The carbon ring seal structure is adopted, and the expansion difference between the blade ring and the cylinder is dynamically compensated by magnetic repulsion force, combined with mechanical positioning and external operating interface design, to achieve convenient maintenance without the need to remove the insulation layer.

Benefits of technology

It significantly improves the seal reliability and maintenance efficiency of peepholes, reduces maintenance costs, extends structural parts life, and increases unit availability.

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Abstract

The invention discloses a peephole plug, an air cylinder plugging structure and a using method thereof, and belongs to the technical field of structural design of gas turbines. The structure comprises a cylinder, a blade ring, a guide pipe, an outer plug, an inner plug, an upper magnet and a lower magnet, the guide pipe is arranged outside a peephole in the outer wall of the cylinder, and the height of the guide pipe is larger than the thickness of a thermal insulation layer. The blade ring is provided with a taper hole and a through hole, the spherical surface of the inner plug makes contact with the taper hole, the cylindrical boss is matched with the through hole, an upper magnet and a lower magnet are embedded in the outer plug and the inner plug respectively, the magnetic poles of the upper magnet and the lower magnet are the same, and homopolar repulsive force is utilized to enable the inner plug to press the blade ring to achieve sealing. During maintenance, the heat preservation layer does not need to be dismantled, the outer plug is lifted through threads, the inner plug is taken out through magnetic adsorption, and convenience is remarkably improved. The problems of thermal stress seizure, tedious disassembly and assembly of a heat preservation layer and the like of traditional rigid plugging are solved, reliable sealing and convenient overhauling under high temperature and high pressure are achieved, the overhauling efficiency is greatly improved, the maintenance cost is reduced, and the sealing device is suitable for sealing the peephole of the double-layer cylinder structure of the gas turbine.
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