Spray Gun Nozzle Guide Wall Air Grooves
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Solution Overview
Problem
The existing spray gun designs with air grooves on the periphery of the coating material nozzle face limitations in coating material ejection due to air flow penetration, which hinders the ejection amount and atomization efficiency.
Innovation Solution
A spray gun design featuring a guide wall on the tip end surface of the coating material nozzle with air grooves that have a bottom portion within the guide wall's range, preventing air flow penetration and optimizing the ejection amount by controlling the coating material flow, while the air grooves are configured to have specific dimensions and angles to enhance atomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bottom portion of air grooves is configured at the foremost end to reach the inner peripheral surface of the coating material ejection opening, then the air flow can directly penetrate the coating material to improve atomization, but the ejection amount of coating material is excessively reduced
Solution Approach 1:
The harmful function of air groove bottom portions reaching the inner peripheral surface is extracted and eliminated. The air groove bottom portions are repositioned to be located on the guide wall within a range that does not reach the inner peripheral surface, thereby removing the source of excessive resistance while preserving the beneficial air flow penetration for atomization.
Solution Approach 2:
The guide wall is introduced as a localized structure with specific geometric properties (inclined surface) that creates different flow characteristics. This local quality modification allows the air grooves to be positioned optimally on the guide wall, achieving both sufficient air flow penetration for atomization and minimal resistance to coating material ejection.
2Quantity of substance
If the coating material ejection opening is enlarged in diameter to increase ejection amount, then the ejection amount increases, but the air flow penetration resistance remains excessive and limits further increase in ejection amount
Solution Approach 1:
The harmful resistance effect is extracted by repositioning the air groove bottom portions away from the inner peripheral surface. This allows the ejection opening to be enlarged without the air grooves creating excessive resistance, thereby enabling increased ejection amount while maintaining atomization quality.
Solution Approach 2:
The solution moves from a two-dimensional problem (air groove bottom position on the surface) to a three-dimensional solution by utilizing the guide wall's inclined surface. This dimensional change allows optimal positioning of air grooves that balances both atomization and ejection amount requirements.
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 design ensures a sufficient ejection amount of coating material and improves atomization by reducing resistance from air flow penetration and optimizing the flow pattern, allowing for increased coating material output and uniform distribution.
Implementation Method 1
The air grooves are designed such that the compressed air increases in gas-liquid contact area while passing through the grooves, and then mixes with the ejected coating material by collision
Implementation Method 2
the guide wall controlling the coating material flow ejected from the coating material ejection opening
Implementation Method 3
the air cap defining a ring-shaped slit between an inner peripheral surface thereof and an outer peripheral surface of the tip end portion of the coating material nozzle to allow the air flow to be ejected therethrough
Data Source
AI summary
Disclosed is a spray gun including: a body having a gun barrel; a coating material nozzle disposed on a tip end side of the gun barrel, and an air cap disposed on the tip end side of the gun barrel to surround a tip end portion of the coating material nozzle, wherein the tip end portion of the coating material nozzle has on the tip end surface thereof a guide wall spreading, and also has on the outer peripheral surface thereof a plurality of air grooves channeled in a longitudinal direction, and wherein each of the air grooves has a bottom portion gradually increasing in depth in the longitudinal direction, the bottom portion being located within a range of the guide wall on the tip end surface of the coating material nozzle.