Rotary Atomizing Spray Head with Curved Diffusion Surface
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Solution Overview
Problem
Conventional rotary atomizing coating devices face issues with forming both thin films and liquid threads due to the tendency of liquid films becoming thick or too thin at the coating diffusion surface, leading to potential overflow or failure to enter grooves, resulting in coating defects.
Innovation Solution
A rotary atomizing coating device with a spray head featuring a first coating diffusion part with a convex shape and a second part with a concave shape extending to the outer edge, including grooves, where the convex shape enhances centrifugal force along the surface for faster film formation and the concave shape guides the thin film into grooves for thread formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a coating diffusion surface with a concave shape is used, then the liquid film is quickly supplied to the outer edge, but the liquid film becomes thick and may overflow from the groove
Solution Approach 1:
The coating diffusion surface is divided into multiple sections with different curvatures: a first diffusion section with a first curvature radius and a second diffusion section with a second curvature radius. This segmentation allows different regions to perform different functions - the first section controls liquid film thickness while the second section ensures proper liquid thread formation at the outer edge.
Solution Approach 2:
Different curvature radii are applied to different sections of the coating diffusion surface. The first diffusion section has a larger curvature radius to prevent excessive thinning, while the second diffusion section has a smaller curvature radius to guide liquid threads into grooves. This local variation in geometric properties optimizes coating formation at each location.
2Manufacturing precision
If a coating diffusion surface with a convex shape is used, then the liquid film becomes thin, but the coating moves too fast and does not enter the grooves to form liquid threads
Solution Approach 1:
The coating diffusion surface is divided into multiple sections with different curvatures: a first diffusion section with a first curvature radius and a second diffusion section with a second curvature radius. This segmentation allows different regions to perform different functions - the first section controls liquid film thickness while the second section ensures proper liquid thread formation at the outer edge.
Solution Approach 2:
Different curvature radii are applied to different sections of the coating diffusion surface. The first diffusion section has a larger curvature radius to prevent excessive thinning, while the second diffusion section has a smaller curvature radius to guide liquid threads into grooves. This local variation in geometric properties optimizes coating formation at each location.
3Quantity of substance
If the liquid film becomes very thick, then it separates from the curved surface before reaching the outer edge, causing coating defects
Solution Approach 1:
The coating diffusion surface is divided into multiple sections with different curvatures: a first diffusion section with a first curvature radius and a second diffusion section with a second curvature radius. This segmentation allows different regions to perform different functions - the first section controls liquid film thickness while the second section ensures proper liquid thread formation at the outer edge.
Solution Approach 2:
Different curvature radii are applied to different sections of the coating diffusion surface. The first diffusion section has a larger curvature radius to prevent excessive thinning, while the second diffusion section has a smaller curvature radius to guide liquid threads into grooves. This local variation in geometric properties optimizes coating formation at each location.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures the formation of both thin films and liquid threads, preventing overflow and ensuring consistent coating quality even with increased coating supply, suitable for large discharge applications.
Implementation Method 1
which delivers the coating supplied from a coating machine through a coating outlet hole provided at a hub member by using the centrifugal force of the rotation
Data Source
AI summary
The rotary atomizing coating device (1) is provided with a spray head (2) formed of a tube body having a circular truncated conical shape and constituted to spray, from an opening end on the large diameter side, a coating introduced from an opening end on the small diameter side thereof, and a coating supply machine (3) engaged with the spray head (2) for supplying the coating while rotating the spray head (2) around an axial line (O). The spray head (2) has a first coating diffusion part (28) having a curved surface with a convex shape towards the axial line (O) on the inner peripheral surface, and a second coating diffusion part (29) extending to an outer edge (26) of the opening end on the large diameter side having a curved surface with a concave shape towards the axial line (O) with grooves (4) on the outer edge (26).