Scroll Arrangement Bell Mouth Segmentation for Airflow Stability

The bell mouth is divided into multiple sections with different diameters (first bell mouth section, second bell mouth section, third bell mouth section) instead of using a single round shape. This segmentation allows different sections to have different functions: the first section reduces flow resistance, the second section stabilizes pressure distribution, and the third section controls flow direction, thereby resolving the contradiction between structural simplicity and flow stability.

Different sections of the bell mouth are designed with different local properties (different diameters and orientations). The first section has a larger diameter for reducing resistance, the second section has a specific diameter for pressure stabilization, and the third section is oriented at an angle for flow control. This local differentiation resolves the contradiction by making each part optimized for its specific function rather than using a uniform simple shape.

The bell mouth is segmented into three distinct sections with progressively smaller diameters extending inwardly. This segmentation creates a gradual pressure equalization effect where each section contributes to uniform pressure distribution, resolving the contradiction between achieving uniform pressure and maintaining structural simplicity.

The bell mouth sections use curved surfaces with specific radii of curvature to guide flow smoothly. The curved geometry of each section helps distribute pressure uniformly while maintaining a relatively simple overall structure, avoiding the need for complex angular or faceted designs.

The patent establishes specific parameter ranges (0.75 ≤ D/H ≤ 0.85 and 0.45 ≤ d/D ≤ 0.55) to optimize blowing efficiency. By defining these parameter relationships, the design achieves maximum productivity without requiring complex geometric configurations, as the optimization is achieved through parameter selection rather than complex structural design.

The scroll body and fan are designed as a composite system where the geometric parameters of both components are coordinated. The relationship between scroll body dimensions and fan dimensions creates an optimized composite structure that achieves high blowing efficiency through parameter coordination rather than individual component complexity.