Offset Inlet Mixer Design for Plural Component Spray Guns
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Solution Overview
Problem
Plural component spray guns face issues with fluid crossover events due to pressure imbalances, leading to unusable equipment and inefficient mixing, which affects fluid delivery, dispersal, and chemical reaction effectiveness.
Innovation Solution
The mixer design features offset and angled inlets for the two fluid components, reducing the risk of crossover by minimizing impingement and back pressure, while enhancing fluid mixing and flow rates through optimized orifice placement and geometry, such as a cat-eye outlet, to ensure efficient chemical reaction and foam generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coaxial inlets are used in the mixer, then the structure is simple, but fluid crossover events occur due to pressure imbalances causing back pressure and inefficient mixing
Solution Approach 1:
The patent applies asymmetry by positioning the first and second fluid component inlets at offset locations relative to the mixer centerline, rather than using symmetric coaxial inlets. The first inlet is positioned at a first offset distance and the second inlet at a second offset distance, creating an asymmetric flow pattern that directs fluids away from each other and prevents pressure-induced crossover events while maintaining structural simplicity
Solution Approach 2:
The patent transitions from a one-dimensional coaxial inlet arrangement to a two-dimensional offset inlet configuration. By positioning inlets at different radial offsets from the centerline and angling them relative to the mixer axis, the design creates spatial separation that eliminates pressure imbalances without significantly increasing structural complexity
2Reliability
If offset and angled inlets are used to reduce crossover, then reliability improves, but mixing efficiency may be compromised
Solution Approach 1:
The patent optimizes mixing efficiency by carefully selecting specific parameter values: the first inlet is angled between 15-30 degrees and the second inlet between 30-45 degrees relative to the mixer axis. These parameter adjustments ensure that while fluids are directed away from each other to prevent crossover, they still converge in the mixing chamber at controlled angles that promote effective mixing without creating excessive back pressure
Solution Approach 2:
The patent applies different offset distances and angles to different inlets based on their specific requirements. The first inlet has a first offset distance and angle, while the second inlet has a second offset distance and angle, allowing each fluid component to be optimized for its specific flow characteristics and mixing requirements, thereby maintaining high mixing efficiency while preventing crossover
3Productivity
If traditional inlet positioning is used, then device complexity is low, but back pressure increases reducing flow rates
Solution Approach 1:
The asymmetric offset inlet configuration eliminates the pressure imbalances that cause back pressure in traditional coaxial designs. By positioning inlets at different radial offsets and angling them appropriately, the design creates balanced flow paths that reduce resistance and increase overall flow rates through the mixer without requiring complex additional components
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 solution significantly reduces the risk of crossover events, maintains or improves mixing efficiency, and increases flow rates, allowing for consistent and effective foam generation with reduced back pressure and improved spray pattern, thus enhancing operational reliability and efficiency.
Implementation Method 1
The first and second fluid component inlets are offset with respect to a centerline of the mixer and positioned such that a first fluid flow from the first inlet is directed away from the second inlet, and a second fluid flow from the second inlet is directed away from the first inlet
Implementation Method 2
enhancing fluid mixing and flow rates through optimized orifice placement and geometry
Implementation Method 3
enhancing fluid mixing and flow rates through optimized orifice placement and geometry, such as a cat-eye outlet, to ensure efficient chemical reaction and foam generation
Implementation Method 4
Plural component systems mix two or more fluids and apply the mixture to an application site. Plural component systems are often used to spray two components that, when mixed, react and cure on a surface. One particular usage for plural component systems is to generate a foam through the reaction of an A component and a B component
Data Source
AI summary
A mixer for a plural component spray gun is presented. The mixer has a mixer body comprising a mixing chamber with an outlet. The mixer also has a first fluid component inlet, coupled to a first fluid conduit, configured to introduce a first fluid component into the mixing chamber. The mixer also has a second fluid component inlet, coupled to a second fluid conduit, configured to introduce a second fluid component into the mixing chamber. The first and second fluid component inlets are offset with respect to a centerline of the mixing chamber and positioned such that a first fluid flow from the first inlet is directed toward the outlet, and a second fluid flow from the second inlet is directed toward the outlet.