Foam Precursor Hose Sizing for Valve-Free Ratio Control
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Solution Overview
Problem
Existing insulation foam precursor dispensing systems are cumbersome, costly, and prone to inaccuracies due to reliance on volumetric proportioners, flow control valves, and static flow restrictors, which can lead to inconsistent dispensing ratios and equipment failures from precursor crystallization.
Innovation Solution
A self-contained system that maintains equal pressures in precursor vessels and adjusts hose lengths and diameters to ensure precise volumetric ratios without using volumetric proportioners, flow control valves, or static flow restrictors, by configuring hoses with varying effective lengths based on precursor properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If volumetric proportioners and flow control valves are used to maintain precise precursor mixing ratios, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent removes volumetric proportioners and flow control valves from the dispensing system, replacing them with a simplified architecture that uses only pressure-regulated vessels and proportional restrictors. This extraction of complex components directly reduces device complexity while maintaining precision through the pressure-regulated flow paths.
Solution Approach 2:
The system changes the control parameter from volumetric measurement (using proportioners and flow meters) to pressure regulation (using pressure-regulated vessels). By regulating pressure rather than measuring volume, the system achieves precise mixing ratios without complex volumetric measurement devices, resolving the contradiction between precision and complexity.
2Manufacturing precision
If flow control valves and flow meters are used to monitor and adjust precursor flow rates, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The pressure-regulated vessels automatically maintain constant precursor flow rates through their internal pressure regulation mechanisms, eliminating the need for operator intervention to monitor or adjust flow rates. The system serves itself by using pressure-differential flow paths that inherently maintain proportional flows without requiring operator attention or adjustment.
3Device complexity
If static flow restrictors are used to control precursor flow ratios, then device complexity is reduced, but manufacturing precision deteriorates
Solution Approach 1:
The patent replaces static flow restrictors with dynamic pressure-regulated flow paths. The pressure regulation allows the system to adapt to changing conditions (such as precursor level changes in vessels) while maintaining consistent proportional flows. This dynamic approach preserves precision without requiring complex active control mechanisms.
4Manufacturing precision
If volumetric proportioners are used to control precursor mixing ratios, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent extracts and removes volumetric proportioners from the system, replacing them with pressure-regulated vessels connected through proportional restrictors. This simplifies manufacturing by eliminating complex proportioning mechanisms while maintaining precision through pressure-based flow control, making the system easier to assemble and more mobile.
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
Ensures reliable and consistent dispensing of precursors into building cavities with precise volumetric ratios, reducing equipment failures and operational complexity while maintaining mobility and cost-effectiveness.
Implementation Method 1
maintains equal pressures in precursor vessels
Implementation Method 2
precursor flow paths configured to provide fluid communication between the precursor vessels and the dispensing gun
Data Source
AI summary
A self-contained, mobile precursor dispensing system causes foam precursors to flow from precursor vessels via hoses to a dispensing gun in a required volumetric ratio. Instead of requiring the precursors to flow through a volumetric proportioner, volumetric flow meters, or flow control valves, effective lengths of the hose are configured to cause the precursors to flow in the required volumetric ratio. The effective hose lengths can be configured by selecting hoses having different inner diameters, different physical lengths, and/or different degrees of internal roughness. A compound hose having a desired effective length can be formed by joining together a plurality of hose segments of differing physical properties. The precursor flow rates can be measured by dispensing each precursor separately under identical conditions and weighing the dispensed precursor quantities. Initial precursor volumes and gas-filled head spaces in the vessels can be proportionate to the required volumetric ratio.