Double Conical Chimney Cap for Downdraft Protection

The patent replaces mechanical moving parts with a passive aerodynamic structure. The weather cap uses fixed conical surfaces and tubular elements that rely on fluid dynamics rather than mechanical movement to prevent downdraft, eliminating bearing degradation and mechanical failure modes.

The weather cap structure uses the exhaust flow itself and ambient wind patterns to maintain its protective function. The conical surfaces and tubular configuration passively adapt to varying wind conditions without requiring active control or mechanical adjustment, allowing the system to serve itself across different operational conditions.

The weather cap converts harmful rain and wind into beneficial flow patterns. The conical surfaces and tubular configuration use the kinetic energy of incoming rain and wind to create protective flow separation and pressure differentials that prevent entrainment, rather than requiring high exhaust velocity to overcome these factors.

The patent changes the geometric parameters of the exhaust system by introducing conical surfaces with specific angles and tubular configurations. These geometric parameter changes create favorable flow conditions that prevent rain entrainment at lower exhaust velocities, reducing energy requirements while maintaining protection.

The weather cap introduces a vertical dimension to downdraft prevention through its conical and tubular geometry. By creating three-dimensional flow separation surfaces and pressure zones, the device protects against reverse flow while maintaining unobstructed vertical exhaust pathways that preserve natural circulation.

The patent segments the exhaust flow path into protected and unprotected zones using conical surfaces and tubular elements. This segmentation allows downdraft prevention in specific regions while maintaining open flow paths in other areas, preserving overall natural circulation productivity.