Reversible Air-Assisted Airless Spray Tip with Rear-Routed Air Passages
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Solution Overview
Problem
Air-assisted airless spray guns lack the ability to reverse the tip for cleaning due to difficulties in routing air passages to the front, limiting their versatility and efficiency.
Innovation Solution
A reversible air-assisted airless spray tip assembly with an air cap featuring radially inward air passages and angled jets that guide air flow to the center of the carbide orifice, allowing for effective cleaning and pattern tail removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If air passages are routed to the front of the tip for air-assisted cleaning, then cleaning capability is improved, but device complexity increases making reversal difficult
Solution Approach 1:
The air passages are routed from the rear of the tip assembly rather than the front, allowing the tip to be reversed for cleaning while maintaining simple air passage routing. The air cap includes passages that extend through it, with air jets directed at the orifice from the rear side, enabling effective cleaning without complex front routing
2Productivity
If the tip is made reversible for cleaning, then maintenance efficiency is improved, but air passage routing becomes more difficult
Solution Approach 1:
The air passages are configured to be routed from the rear of the tip assembly, allowing the tip to be reversed for cleaning while maintaining simple air passage routing. This inversion of the conventional approach enables both reversibility and manufacturing simplicity
Solution Approach 2:
The air cap is designed with multi-functional air passages that serve both spraying and cleaning functions. The same air cap structure provides air jets for pattern control during spraying and for cleaning the orifice when the tip is reversed, eliminating the need for separate routing systems
3Manufacturing precision
If air jets are added for pattern control, then spray quality is improved, but device complexity increases
Solution Approach 1:
The air cap merges multiple functions into a single component: it provides air jets for pattern control at the front and air jets for cleaning through passages extending to the rear. This consolidation improves spray pattern quality while avoiding the complexity of separate air control systems
Solution Approach 2:
The air cap serves multiple functions simultaneously: controlling the spray pattern during operation and enabling orifice cleaning when the tip is reversed. This multi-functionality is achieved through a unified structure with strategically positioned air passages and jets
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
Enables efficient cleaning and improved pattern control by directing air flow precisely to the orifice, enhancing the tip's reversibility and cleaning capabilities.
Implementation Method 1
The air cap is provided with four air passages which aim radially inwardly... The passages have a 12° angle from being perpendicular to the longitudinal axis of the assembly... four jets provided by these passages
Implementation Method 2
Two pairs of opposing air jets are also provided in the air cap directed perpendicularly to the fan of paint or other atomized material... help in removing tails from the pattern
Data Source
AI summary
The device (10) utilizes a standard reversible airless tip (12). The air cap (18) is provided with four air passages (20) which aim radially inwardly at 45° from the centerline of the housing (30). The passages (20) have a 12° angle from being perpendicular to the longitudinal axis (24) of the assembly (10). The four jets (20) provided by these passages are guided by four channels (28) in the surface of the housing (30) (also having the 12° ramp angle) so as to guide the air flow to the center of the oval orifice (14a) in the carbide (14). Two pairs of opposing air jets (22) are also provided in the air cap (18) directed perpendicularly to the fan (26) of paint or other atomized material and these jets (22) are angled at about 20.5° relative to the plane that is perpendicular to the longitudinal axis (24) of the assembly (10). Each pair is directed at one another and is spaced laterally from the longitudinal axis (24) to help in removing tails from the pattern.