Bell Cup Through-Hole Structure for Focused Rotary Coating
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Solution Overview
Problem
Conventional rotary atomizing coating devices face inefficiencies in coating pattern spread and reduced efficiency due to the limitations of through holes in the bell cup, which restrict particle diameter and require shaping air to direct coating material, leading to uneven application.
Innovation Solution
The device incorporates a bell cup with a side surface portion featuring through holes and an outward protruding portion that generates airflow towards the distal end, allowing coating material to be ejected without shaping air, and includes design features like staggered hole patterns and inward protruding portions to stabilize particle size and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If through holes are formed in the side surface portion of the bell cup to eject coating material, then the particle diameter of the ejected coating material is limited to be smaller than the hole diameter, but the coating pattern spreads out over a large area because particles cannot be ejected toward the surface to be coated
Solution Approach 1:
The bell cup is designed with asymmetric features including an outward protruding portion that disrupts the symmetric radial ejection pattern. This asymmetric structure creates a preferred ejection direction toward the distal end, concentrating the coating pattern on the target surface rather than spreading radially outward.
Solution Approach 2:
The invention transitions from two-dimensional radial ejection (in the radial direction only) to three-dimensional ejection by adding axial component. The outward protruding portion and through hole arrangement enable particles to be ejected with both radial and axial velocity components, directing them toward the distal end and the surface to be coated.
2Area of stationary object
If shaping air is used to direct particles toward the surface to be coated, then the coating pattern spread is reduced, but the coating efficiency is reduced
Solution Approach 1:
The invention extracts and eliminates the need for shaping air by incorporating the flow-direction controlling function directly into the bell cup structure. The outward protruding portion and through hole geometry inherently guide particles toward the distal end without requiring external air streams, thus maintaining coating efficiency while achieving concentrated pattern.
Solution Approach 2:
The bell cup structure serves multiple functions including particle containment, particle ejection, and flow direction control. The outward protruding portion automatically directs particles toward the distal end through its geometric configuration, making the system self-regulating without external assistance from shaping air.
3Device complexity
If particles are ejected radially outward by centrifugal force, then the ejection mechanism is simple, but the coating material cannot be directed toward the surface to be coated located at the distal end
Solution Approach 1:
The bell cup is designed with locally differentiated features: the outward protruding portion is positioned at a specific location closer to the distal end, creating localized flow control. This local structural modification directs particles toward the distal end without requiring complex global changes to the ejection mechanism, maintaining simplicity while improving direction control.
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 enables targeted ejection of coating material towards the surface to be coated, reducing pattern spread and improving coating efficiency and uniformity without the need for shaping air.
Implementation Method 1
A rotary atomizing coating device is a device which performs coating by ejecting a coating material (paint) from a rotating bell cup to the outside by centrifugal force
Implementation Method 2
an outward protruding portion that is formed closer to the distal end in the axial direction than the through hole and protrudes more outward in a radial direction of an axis of the rotary drive unit than the side surface portion... generates airflow towards the distal end
Data Source
AI summary
A rotary atomizing coating device includes a main body including a rotary drive unit, and a bell cup attached to the rotary drive unit. The bell cup includes: a side surface portion extending toward a distal end in an axial direction of the rotary drive unit; a through hole configured to allow an inner surface and an outer surface of the side surface portion to communicate with each other and also configured to eject a coating material therethrough; and an outward protruding portion that is formed closer to the distal end in the axial direction than the through hole and protrudes more outward in a radial direction of an axis of the rotary drive unit than the side surface portion.