Fluid Applicator Dual-Spring Valve for Spit Reduction
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Solution Overview
Problem
Spitting, which includes the expulsion of droplets or uneven bursts of fluid, occurs during the activation and deactivation of spray guns, leading to inconsistent finishes, wasted fluid, and additional labor for touch-ups, due to factors such as fluid volume size, valve actuation speed, and pressure accumulation.
Innovation Solution
The system reduces spitting by minimizing the fluid volume downstream of the valve, increasing the speed of valve actuation, and decreasing pressure accumulation through the use of a spray tip assembly with a smaller seal and a dual spring mechanism that quickly opens and closes the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the fluid volume downstream of the valve is reduced, then spitting is reduced, but the seal size is reduced
Solution Approach 1:
The patent changes the material parameter of the seal from traditional rubber to a harder material (durometer between 40-70 on the Shore A scale). This parameter change allows the seal to maintain effective sealing function with a smaller volume, thereby reducing the fluid volume downstream of the valve and minimizing spitting while preserving the necessary seal size for proper function
2Object-generated harmful factors
If the valve actuation speed is increased, then spitting is reduced, but the spring mechanism complexity increases
Solution Approach 1:
The patent segments the spring mechanism into two distinct functional components: a first spring dedicated to valve opening and a second spring dedicated to valve closing. This segmentation allows each spring to be optimized for its specific function, enabling rapid valve actuation that reduces spitting, while maintaining manageable complexity through clear functional division rather than a single complex mechanism
Solution Approach 2:
The valve assembly integrates multiple functions into a compact structure where the valve body, seal, and dual spring mechanism work together in a unified assembly. The valve assembly serves both flow control and rapid actuation functions, reducing the need for separate components and minimizing overall complexity despite the enhanced actuation speed capability
3Object-generated harmful factors
If pressure accumulation is decreased, then spitting is reduced, but the valve closing speed must be increased
Solution Approach 1:
The patent extracts the valve closing function from the valve opening mechanism by introducing a separate second spring that exclusively handles valve closing. This extracted dedicated closing mechanism can operate independently and rapidly to decrease pressure accumulation and eliminate spitting, without being constrained by the opening mechanism's design 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
This approach effectively reduces both start and stop spitting by quickly pressurizing and depressurizing the fluid volume, resulting in a smoother application pattern and minimizing fluid waste.
Implementation Method 1
a first spring configured to bias the valve assembly in a second direction and to be compressed by movement of the valve assembly in the first direction
Implementation Method 2
a second spring configured to store energy in a first phase of the movement of the valve assembly in the first direction of movement and to release the stored energy in a second phase of the movement of the valve assembly in the first direction
Implementation Method 3
the seal comprises a captivating wing configured to contact an inner surface of the retaining element and thereby establish a friction fit between the seal and the retaining element
Data Source
AI summary
A fluid applicator includes a gun having a trigger, a valve assembly moveable in a first direction by actuation of the trigger, a first spring that biases the valve assembly in a second direction and is compressible by movement of the valve assembly in the first direction, and a second spring that stores energy in a first phase of the movement of the valve assembly in the first direction and releases the stored energy in a second phase of the movement of the valve assembly in the first direction. The applicator includes a spray tip assembly having a spray tip, a tip saddle, and a seal element disposed within the tip saddle and having a top surface in contact with an exterior surface of the tip saddle, the seal element defining an inlet to the spray tip assembly and forming a seal between the gun and the spray tip assembly.