Hot air door shaft sealing device

By combining dynamic and static sealing sleeves and designing a copper-graphite alloy sleeve, the problem of air and coal powder leakage in the hot air damper shaft sealing device under high temperature and high pressure was solved, achieving high temperature resistant sealing and elastic compensation, thus extending the service life of the equipment.

CN223924058UActive Publication Date: 2026-02-17祁增荣
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Patent Information

Application Number
CN202520691538.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-14
Publication Date
2026-02-17
Estimated Expiration
2035-04-14

AI Technical Summary

Technical Problem

Existing hot air damper shaft sealing devices are prone to air leakage and coal dust leakage under high temperature and high pressure environments. The sealing performance of existing technologies is poor, especially organic seals which are not resistant to high temperatures and are prone to failure after high temperature expansion.

Method used

It adopts a combination structure of dynamic sealing sleeve and static sealing sleeve, uses elastic elements to elastically compensate for the metal sealing ring, converts axial sealing into planar sealing through the turning channel, and uses the metal sealing ring in high temperature environment. Combined with the self-lubricating effect of copper graphite alloy sleeve, it ensures sealing performance.

Benefits of technology

It improves sealing performance under high temperature conditions, reduces friction loss, extends equipment service life, and cleans coal ash when the machine is shut down to prevent increased friction.

✦ Generated by Eureka AI based on patent content.
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Abstract

The utility model discloses a hot air door shaft sealing device, and belongs to the technical field of shaft sealing. The sealing device comprises a dynamic sealing sleeve and a static sealing sleeve which are sleeved inside and outside, wherein a sealing assembly is arranged between the dynamic sealing sleeve and the static sealing sleeve; the sealing assembly comprises an elastic piece, a first sealing ring and a shaft sleeve which are sequentially arranged on the movable sealing sleeve in a sleeving mode from top to bottom. The outer circumferential wall of the movable sealing sleeve and the inner circumferential wall of the static sealing sleeve are each provided with an annular table, the first sealing ring is located above the annular tables, the shaft sleeve is located below the annular tables, and a steering channel is formed between the first sealing ring and the shaft sleeve. The steering channel is used for converting axial sealing at the peripheral wall of the dynamic sealing sleeve into plane sealing at an air outlet of the steering channel, and the air outlet of the steering channel is arranged far away from an axial sealing surface between the shaft sleeve and the dynamic sealing sleeve; the first sealing ring is a high-temperature-resistant metal sealing ring, and the metal sealing ring conducts elastic compensation through the extrusion elastic force of the elastic piece.
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