Intumescent Coated Wall Duct for Fireproof Conductor Lead-Through

The patent applies a composite material solution by coating the aluminum generator duct with intumescent material. This creates a composite structure where the aluminum provides structural integrity and electrical conductivity, while the intumescent coating provides fire resistance. When exposed to fire temperatures, the intumescent material swells to form an insulating char layer that prevents heat transfer and maintains the aluminum duct's structural integrity, thereby resolving the contradiction between ease of manufacture and fire resistance.

The intumescent material applied to the generator duct employs a self-service mechanism where the material automatically activates in response to heat exposure. Upon detecting fire temperatures, the intumescent coating self-swells to form an insulating barrier without requiring external control systems, sensors, or active components. This automatic response provides fire protection while minimizing device complexity, as the protective action is inherent to the material's chemical properties rather than requiring additional mechanical or electronic systems.

The patent carefully controls the activation temperature parameter of the intumescent material to swell at ≥120°C, which is above the normal operating temperature range of 90°C-105°C. This parameter selection ensures that during normal operation, the air gap between the conductor and outer shell is maintained for proper electrical insulation. Only when fire conditions raise the temperature above 120°C does the material activate, at which point fire resistance becomes the priority over electrical insulation. This parameter-based differentiation resolves the contradiction by ensuring the protective mechanism only activates under appropriate conditions.