Dispenser Head With Variable Thickness Spray Wall
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Solution Overview
Problem
Conventional fluid dispenser heads fail to effectively control the divergence and diameter of spray holes, limiting the homogeneity of spray droplet size and distribution.
Innovation Solution
A fluid dispenser head with a spray wall of non-constant thickness, achieved by drilling holes in a flat strip and then deforming it to vary the thickness, which influences the orientation, diameter, and section of the holes, using techniques like stamping with convex and concave dies to exert controlled stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spray wall has constant thickness with holes drilled perpendicular to the plane, then the manufacturing process is simple, but the holes cannot diverge and the spray opening angle remains low
Solution Approach 1:
The spray wall is curved to transform the planar surface into a three-dimensional shape. When holes are drilled perpendicular to the curved surface, they naturally diverge due to the varying surface normals across the curved geometry. This curvature enables spray hole divergence and increased opening angle while maintaining a relatively simple manufacturing process of drilling perpendicular holes followed by wall curvature formation.
2Shape
If the spray wall is curved to make holes diverge, then the spray opening angle increases, but the control over hole diameter and section becomes difficult
Solution Approach 1:
The spray wall thickness is varied locally across different regions. By controlling the thickness distribution (e.g., thinner at certain zones, thicker at others), the invention achieves precise control over hole diameter and cross-section at each location. This local thickness variation compensates for the effects of wall curvature, ensuring that holes maintain desired dimensions despite the curved geometry and divergence requirements.
3Manufacturing precision
If the spray wall thickness varies to control hole diameter, then the spray performance improves, but the manufacturing complexity increases
Solution Approach 1:
The invention controls the thickness parameter of the spray wall as a continuous gradient or stepped variation rather than discrete changes. By systematically varying the thickness parameter across the spray wall surface, the invention achieves precise control over hole cross-sections and diameters. This parameter-based approach allows for optimized spray performance while managing manufacturing complexity through controlled, systematic thickness variation rather than complex multi-component structures.
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
The deformation of the spray wall results in diverging holes with varying diameters and sections, enhancing the homogeneity and distribution of spray droplets, improving the overall spray performance.
Implementation Method 1
the deformation of the spray wall results in diverging holes with varying diameters and sections
Implementation Method 2
deforming the pierced strip by locally reducing its thickness by creep
Data Source
Figure 1~3a
Figure 3b
Figure 4a~4b
AI summary
A head for dispensing fluid product comprising a spray wall (26) pierced by holes (O1, O2, O3) through which the pressurised fluid product passes so as to be sprayed in fine droplets, the spray wall (26) defining a central axis X and having two faces (26a, 26b) connected by the holes (O1, O2, O3), the holes (O1, O2, O3) having an orientation that diverges with respect to the central axis X, characterised in that the spray wall (26) has a variable thickness, so that the two faces (26a, 26b) are at different distances from each other.