Obtuse Angle Nozzle End Face for High-Viscosity Paint Atomization
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Solution Overview
Problem
Existing nozzle arrangements for paint spray guns struggle with atomizing materials of high viscosity, resulting in coarse paint mist and poor coating quality due to insufficient shear forces, and require additional pressure or complex, expensive designs to improve atomization.
Innovation Solution
A nozzle arrangement with a paint nozzle and air cap design where the end face of the paint nozzle forms an angle greater than 90° with its external face, allowing atomizing air to direct onward in the spraying direction, creating a vacuum for efficient atomization without additional pressure, and featuring a hollow-cylindrical plug that allows direct atomizing air action on the paint jet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the paint nozzle has a conventional end face design (perpendicular or acute angle), then the structure is simple, but the atomization of high-viscosity materials is insufficient resulting in coarse paint mist
Solution Approach 1:
The patent changes the geometric parameter of the nozzle end face from a conventional perpendicular or acute angle to an obtuse angle (greater than 90 degrees). This parameter change creates a specific flow pattern where atomizing air passes along the external face and creates a vacuum at the end face, generating shear forces that effectively atomize high-viscosity materials without requiring complex additional components
2Manufacturing precision
If additional pressure is applied to improve atomization of high-viscosity materials, then atomization quality improves, but the pressure counteracting the paint jet increases and energy consumption rises
Solution Approach 1:
The patent utilizes pneumatic principles by introducing atomizing air that flows through the annular gap between the air cap wall and paint nozzle external face. The obtuse angle end face design creates a vacuum effect that draws the paint jet into the air stream, generating shear forces for atomization without requiring additional pressure on the paint supply system
3Productivity
If a hollow-cylindrical plug is used with direct atomizing air action, then atomization efficiency improves, but the nozzle design becomes more complex
Solution Approach 1:
The hollow-cylindrical plug serves multiple functions: it forms the outlet for material to be sprayed, provides a surface for the paint needle to seal against, and creates the annular gap necessary for atomizing air flow. This multi-functional design achieves efficient atomization without requiring separate components for each function
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 achieves finer atomization of high-viscosity materials with improved coating quality and reduced pressure counteracting the paint jet, while maintaining a simpler and lighter construction compared to pressure-fed guns.
Implementation Method 1
The atomizing air in the nozzle arrangement described above generating a vacuum on the end face, on account of which the material to be sprayed is suctioned from the paint nozzle
Implementation Method 2
Said threads and strings, by virtue of the hydrodynamic instability and aerodynamic disturbances thereof, disintegrate so as to form droplets
Implementation Method 3
Said threads and strings, by virtue of the hydrodynamic instability and aerodynamic disturbances thereof, disintegrate so as to form droplets
Implementation Method 4
the originally conical cross section of the paint jet, or of the paint mist, respectively, is compressed on the sides thereof that face the horns and is elongated in the direction that is perpendicular thereto
Data Source
AI summary
A nozzle arrangement for a spray gun, in particular a paint spray gun, has at least one paint nozzle and an air cap. The paint nozzle has at least one outlet opening for the material to be sprayed and the air cap has at least one central opening which is bounded by at least one wall. The at least one wall forms a gap with at least one part of the paint nozzle, and a forward part of the paint nozzle has at least an inner face, an outer face and an end face. The end face of the paint nozzle encloses, at least in certain regions, an angle of greater than 90° or an angle of less than 90° with an outer face or an inner face of the paint nozzle. In the nozzle arrangements, the back-pressure counter to the outflow of the material to be sprayed is lower than in prior art nozzles. A spray gun, in particular a paint spray gun, having such a nozzle arrangement is also disclosed.