Divergent Secondary Surfaces in Rotary Spraying Members
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotary sprayers with large-diameter spraying members face difficulties in rotating at high speeds due to insufficient turbine performance and air consumption, leading to poor control of the coating jet and quality degradation, especially when trying to achieve high flow rates and prevent droplet recombination.
Innovation Solution
A spraying member with at least two divergent secondary surfaces, an inner and an outer surface, coaxial with the primary surface, where the downstream portions define edges of different diameters, preventing droplet recombination and ensuring axial compactness for easier handling and high-speed rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large-diameter spraying member is used to increase coating product flow rate, then the flow rate capability is improved, but the rotation speed becomes difficult to maintain at high levels due to insufficient turbine performance and high air consumption
Solution Approach 1:
The spraying member is divided into multiple spraying edges (at least three edges) arranged around the periphery, allowing the total coating product flow rate to be distributed across multiple smaller spray zones rather than requiring a single large-diameter member. This segmentation enables high flow rate capability while maintaining manageable rotation speeds.
Solution Approach 2:
The invention transitions from increasing flow rate by increasing diameter (radial dimension) to increasing flow rate by increasing the number of spraying edges (angular/azimuthal dimension). This dimensional shift allows achieving high flow rates without the rotational inertia problems associated with large radial dimensions.
2Quantity of substance
If multiple spraying edges with parallel or convergent directions are used to increase effective spraying length, then the flow rate capability is improved, but droplet recombination occurs which degrades coating quality
Solution Approach 1:
The spraying edges are arranged with asymmetric angular spacing around the periphery of the spraying member, rather than being uniformly or symmetrically distributed. This asymmetric arrangement ensures that the spray trajectories from different edges diverge rather than converge, preventing droplet recombination and maintaining coating quality while achieving high flow rates.
3Productivity
If the spraying member rotates at very high speed to achieve high flow rates, then the productivity is improved, but the control of the sprayed product jet becomes difficult and coating quality degrades
Solution Approach 1:
By segmenting the spraying function into multiple edges, the system can achieve high productivity at moderate rotation speeds rather than requiring extremely high speeds, thereby maintaining better control over the sprayed product jet and coating quality.
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 solution effectively prevents droplet recombination, maintaining coating quality and allowing for high flow rates while enabling efficient operation at high speeds, ensuring even and uniform droplet sizes for improved coating quality and easier handling of the sprayer.
Implementation Method 1
a rotary device for spraying coating product comprising a spraying member, means for rotating this member
Data Source
AI summary
The invention relates to a member (10) for spraying a coating product comprising a primary surface (20) for spreading the product and at least two secondary, inner (21) and outer (22) surfaces for spreading the product that extend downstream of the primary surface (20), the primary (20) and secondary (21, 22) surfaces being coaxial (X10-X10), the downstream portions of the secondary surfaces (21, 22) defining an inner spraying edge (23) and an outer spraying edge (24). The downstream portions (21b, 22b) of the secondary surfaces (21, 22) have, relative to one another, directions (A21, A22) that are overall divergent towards the downstream direction. The inner edge (23) has a diameter substantially smaller than the diameter of the outer edge (24).