Scroll Fan Housing Geometry for Low-Noise Air Blower Flow

The patent applies curvature by forming a scroll-type flow path with a curved bottom surface that gradually expands from the inlet to the outlet. The bottom surface is formed with a specific curvature radius that varies along the flow direction, creating a smooth, rounded expansion rather than a straight or angular path. This curved geometry guides the air flow smoothly, preventing sudden expansions that would cause surging, while efficiently increasing the flow path cross-sectional area to reduce noise and improve flow rate.

The patent applies local quality by varying the thickness of the bottom surface at different locations along the flow path. The bottom surface is designed with different thicknesses: thinner at the inlet region and progressively thicker toward the outlet region. This localized variation in geometry allows the flow path to expand smoothly where needed (near the outlet) while maintaining a compact structure at the inlet, thereby increasing discharged air amount without proportionally increasing overall device complexity.

The patent applies local quality by making the bottom surface thickness location-dependent rather than uniform. The bottom surface is designed with variable thickness: thinner at the inlet region where structural load is lower and flow expansion is prioritized, and progressively thicker toward the outlet region where structural strength is more critical. This localized differentiation allows the flow path to achieve sufficient expansion for high productivity while maintaining adequate structural strength at each location.