▎ 摘　　要

NOVELTY - Multilayer inner cavity with porous filter element structure comprises a cavity cover (1), a cavity hole (2) and a cavity body (3). The cavity cover is meant for sealing the cavity hole. The cavity body is provided with a porous structure. USE - The multilayer inner cavity with porous filter element structure is useful for graphene expansion (claimed). ADVANTAGE - The porous filter element structure retains the micro nano graphene powder within the inner cavity and ensures the overflow of generated gases; prevents the flow of graphene powder in gas pipe and prevents environmental pollution; comprises cavity body which is good for collecting a sample after expansion, is safe to use, high temperature resistant, high pressure resistant and corrosion resistant; and improves the production and expansion efficiencies of graphene. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the multilayer inner cavity with porous filter element structure for graphene expansion. Cavity cover (1) Cavity hole (2) Cavity body (3)