Spray Gun Air Cap Layout for Wide Uniform Atomization
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Solution Overview
Problem
Existing air sprayers struggle to efficiently atomize and shape spray fluids, particularly at high pressures, leading to issues like splitting or tailing of the spray pattern, and are limited in the volume of material they can process per unit time.
Innovation Solution
The air cap for a spray gun features a design with a central aperture and multiple prongs, including inner and outer fan ports that emit compressed gas to atomize and shape the spray fluid, with inner ports aimed at a common focal point and outer ports offset to create a wider pattern without splitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing air sprayers are used to atomize and shape spray fluids at high pressures, then the spray fluid can be delivered efficiently, but the spray pattern suffers from splitting or tailing and the atomization efficiency is insufficient
Solution Approach 1:
The air cap is divided into multiple prongs (typically three) with fan ports distributed across each prong. This segmentation allows the compressed gas to be delivered through multiple distributed pathways, creating a more uniform spray pattern without splitting or tailing while maintaining high atomization efficiency
Solution Approach 2:
Fan ports are positioned at different locations on each prong to create zones of different gas delivery characteristics. This local quality variation ensures that compressed gas is delivered uniformly across the entire spray pattern area, preventing both splitting and tailing effects while maximizing atomization
2Productivity
If the volume of spray material processed per unit time is increased, then productivity improves, but the spray pattern becomes unstable and exhibits splitting or tailing
Solution Approach 1:
By segmenting the air cap into multiple prongs with distributed fan ports, the system can handle higher volumes of spray material while maintaining pattern stability. The multiple gas delivery pathways distribute the atomization load, preventing the spray pattern from splitting or tailing even at increased processing volumes
Solution Approach 2:
The fan ports are positioned in three-dimensional space across multiple prongs at different axial and radial locations. This spatial distribution in multiple dimensions allows the system to maintain stable spray patterns at higher material volumes by providing comprehensive gas delivery coverage across the entire spray area
3Device complexity
If compressed gas is emitted through a single central aperture, then the device structure is simple, but the spray pattern is narrow and lacks shaping capability
Solution Approach 1:
The air cap structure is segmented into multiple prongs with fan ports distributed across them, replacing a single central aperture. This segmentation dramatically increases the spray pattern width and shaping capability while maintaining reasonable structural complexity through the use of identical repeating prong elements
Solution Approach 2:
The design transitions from a single-dimensional central aperture to a multi-dimensional structure with prongs extending in multiple directions and fan ports positioned at various axial and radial locations. This dimensional expansion creates a wide, well-shaped spray pattern while the modular prong design keeps the overall structure manageable
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 air cap enhances atomization and shaping capabilities, allowing for twice the volume of spray material to be processed per unit time while maintaining a wide, uniform spray pattern without splitting or tailing, even at high pressures.
Implementation Method 1
outputting a first portion of compressed gas through an atomization opening in an air cap, the atomization opening disposed annularly about the spray axis, to atomize the stream into a fluid spray
Implementation Method 2
outputting a second portion of the compressed gas through a plurality of fan ports formed in a first prong and a secondprong of the air cap to shape the fluid spray
Data Source
AI summary
A spray gun is configured to emit spray fluid and compressed air that impinges on the spray fluid to atomize the spray fluid. An air cap is configured to emit the compressed air. The air cap includes prongs that extend axially away from a fluid spray nozzle. Openings are formed through the prongs and are configured to emit compressed gas onto the fluid output to shape the fluid output. The openings are disposed in a stacked configuration and include openings offset from a spray axis.