Rotary Atomizing Head Bell Cup Paint Distribution
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Solution Overview
Problem
Conventional rotary atomizing coating devices face challenges in evenly distributing paint between two head bodies due to differences in centrifugal force, leading to uneven paint discharge and complexity in design to address this issue.
Innovation Solution
The rotary atomizing coating device incorporates a rotary atomizing head with a first bell cup, a second bell cup, and an inner member with paint discharge holes that communicate with the second bell cup, allowing for adjustment of paint supply ratio between the two cups, thereby ensuring even paint distribution and atomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotary atomizing head rotates to discharge paint, then paint atomization is achieved, but the centrifugal force acting on the outer head body is larger than on the inner head body, causing uneven paint discharge
Solution Approach 1:
The patent applies local quality by providing different numbers of paint passage branch holes to the first and second head bodies. The outer head body (subject to larger centrifugal force) is given fewer holes, while the inner head body (subject to smaller centrifugal force) is given more holes. This local differentiation compensates for the centrifugal force difference and achieves uniform paint discharge from both head bodies.
2Manufacturing precision
If the number and shape of paint passage branch holes are adjusted to equalize paint discharge, then uniform paint distribution is achieved, but the device structure and design become complicated
Solution Approach 1:
The patent employs asymmetry by intentionally designing the first and second head bodies with different numbers of paint passage branch holes. Rather than making both head bodies identical and trying to compensate for centrifugal force differences through complex control systems, the solution embraces the asymmetry caused by rotation and designs the hole distribution to match the expected centrifugal force pattern, simplifying the overall device structure.
3Productivity
If more paint is supplied to increase coating efficiency, then productivity improves, but the liquid film thickness increases and paint atomization deteriorates
Solution Approach 1:
The patent segments the paint discharge function by using two separate head bodies (first and second head bodies) instead of a single head body. This segmentation allows the paint supply to be distributed across multiple discharge points, enabling increased total paint supply for higher productivity while maintaining thin liquid film thickness and good atomization quality at each discharge point.
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 allows for even paint distribution and atomization, reducing the thickness of the liquid film and improving paint particle formation without increasing the rotational speed of the rotary atomizing head, achieving consistent coating results.
Implementation Method 1
a rotary atomizing head configured to discharge a paint by a centrifugal force caused by rotation of the rotary atomizing head
Data Source
AI summary
A rotary atomizing coating device includes a rotary atomizing head. The rotary atomizing head includes a first bell cup, a second bell cup, and an inner member. The outer peripheral surface of the inner member is provided with paint discharge holes. The paint discharge holes communicate with a paint supply passage. The first bell cup includes a plurality of through holes. The plurality of through holes are disposed near the paint discharge holes. The plurality of through holes communicate with the second bell cup.