Rotating Projector Air Jet Segmentation for Coating Stability
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Solution Overview
Problem
Conventional rotating projectors face challenges in achieving a wide and stable jet of coating product, which limits their ability to efficiently coat large surfaces at high speeds without inhomogeneity or increased cycle time, due to the trade-off between air flow and trajectory pitch.
Innovation Solution
A rotating projector design featuring primary and secondary air jets with specific directional components, where the primary jets have a centrifugal radial component to expand the jet and secondary jets hit the external surface of the projector, creating a stable and wide impact pattern, allowing for closer proximity to the object without compromising transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the flow of air is increased to obtain a wide jet of coating product, then the impact width is improved, but the jet stability deteriorates and the projector cannot be displaced at high speed
Solution Approach 1:
The air flow is segmented into two distinct functions: primary air jets (opening 34) that generate a vortex to stabilize the jet, and secondary air jets (opening 36) that expand the jet width by impacting the external surface of the bowl. This segmentation allows each air jet system to optimize its specific function without compromising the other.
Solution Approach 2:
Different regions of the air flow are given different qualities and directions: primary air jets are oriented with a centrifugal radial component to create rotational stability, while secondary air jets are oriented to expand the jet laterally. Each region of the air flow serves a specific local purpose in achieving both width and stability.
2Productivity
If the projector is displaced at high speed to increase productivity, then the coating efficiency is improved, but the jet becomes inhomogeneous and transfer efficiency decreases
Solution Approach 1:
The primary air jets create a vortex structure in advance that pre-stabilizes the jet before it is subjected to the effects of high-speed displacement. This preliminary stabilization action ensures that even at high displacement speeds, the jet maintains its homogeneity and integrity.
3Area of stationary object
If multiple projectors are used to coat large surfaces, then the coverage area is improved, but the device complexity and booth pollution increase
Solution Approach 1:
The patent combines multiple functions (jet stabilization and jet expansion) into a single projector system through the coordinated action of primary and secondary air jets. This merging allows one projector to achieve the coverage and performance that would otherwise require multiple projectors, thereby reducing complexity and pollution.
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 design enables a stable and wide jet of coating product, allowing for rapid coating of large surfaces with high displacement speeds while maintaining high transfer efficiency and homogeneity, reducing the need for multiple projectors and minimizing booth pollution.
Implementation Method 1
The primary air jets as such generate a swirling flow of air, sometimes qualified as a 'vortex' around the rotational axis of the bowl
Implementation Method 2
a primary direction having, with respect to the rotational axis, an axial component and an orthoradial component which are not equal to zero. The primary direction has a radial component which is not equal to zero and centrifugal with respect to the rotational axis
Implementation Method 3
secondary openings arranged on a secondary contour surrounding the rotational axis, each secondary opening being intended for ejecting a secondary air jet in a secondary direction... such that the secondary jet hits an external surface of the spraying device
Data Source
AI summary
Rotating projector for a coating product including a spraying device having a circular spraying edge, driving means for driving the spraying device around a rotational axis, a body including primary openings arranged on a primary contour for ejecting primary air jets in a primary direction. The air jets having an axial component and an orthoradial component which are nonzero. The primary direction has a nonzero radial component, which is centrifugal relative to the rotation axis. Each primary jet extends along the rotational axis at a distance from the rotational axis than the radius of the spraying edge. The body includes secondary openings arranged on a secondary contour for ejecting the secondary air jets in a secondary direction having axial and centripetal radial components. The secondary jets hit an external surface of the spraying device. The contours coincide with a circle centered about the rotation axis.