A muffle top block structure for a graphitization furnace with air cooling channels

By using a composite structure of zirconia and graphite top blocks and an air-cooling channel design, the problems of heat conduction, thermal expansion, and thermal shock failure of the muffle top block in the graphitization furnace at high temperatures are solved, achieving efficient heat dissipation and structural stability, extending service life and reducing safety risks.

CN224434949UActive Publication Date: 2026-06-30ZHEJIANG JINGGONG SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG JINGGONG SCI & TECH
Filing Date
2025-05-14
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The existing muffle top block of the graphitization furnace suffers from high thermal conductivity at high temperatures, which leads to local temperature exceeding the limit of the metal support frame, a decrease in material yield strength, thermal expansion displacement and thermal shock failure. In addition, traditional insulation layers cannot effectively block heat conduction, resulting in short lifespan and high safety risks.

Method used

By adopting a composite structure of zirconia top block and graphite top block, combined with air cooling channel and water cooling system, and through material composite, flow channel design and mechanical structure optimization, a multi-level heat conduction system is formed to achieve coordinated heat dissipation of active air cooling and passive heat insulation, block heat conduction path and precisely constrain thermal expansion.

Benefits of technology

It effectively reduces the temperature of metal support components by more than 40%, controls the surface temperature of the furnace shell within safe standards, improves thermal shock stability, extends the life of the top block and prevents oxidation, and ensures long-term stable operation of the graphitization furnace.

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Abstract

This utility model discloses a muffle top block structure with air-cooling channels for a graphitization furnace, including a cooling plate, a metal base, a metal top plate, a soft felt, a zirconia top block, and a graphite top block. The zirconia and graphite top blocks have single-channel flow paths inside, while the metal base and top plate have double-channel flow paths, which are connected to form an air-cooling heat dissipation system. The cooling plate has built-in cooling water channels, the metal base is fixed to the cooling plate ribs, and a graphite paper gasket is placed between the base and top plate. Combined with limiting blocks and concave-convex positioning structures, thermal expansion displacement is constrained. This structure, through a triple mechanism of "water cooling-air cooling-thermal insulation," reduces the temperature of metal components by more than 40%, keeping the furnace shell surface temperature ≤80℃ and blocking heat conduction paths. It protects the air-circulated cooling muffle contact interface, improves thermal shock stability, and extends the top block's lifespan. Optimized mechanical structure ensures high-temperature load-bearing capacity and positional stability, solving the problems of metal frame deformation, furnace shell overheating, and thermal shock failure in existing technologies, thus providing a guarantee for the safe production of graphitization furnaces.
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