Curved Capillary Flow Restrictor for CO2 Insect Trap
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Solution Overview
Problem
Existing flow restrictors in applications like CO2 insect traps face issues with precipitation forming due to abrupt flow disruptions, which can lead to performance degradation and blockage, especially in small orifice designs, requiring a solution that reduces fluid pressure without abrupt flow changes and small orifice reliance.
Innovation Solution
A flow restrictor in the form of an elongated capillary tube that gradually reduces pressure through shear and frictional losses, minimizing condensation formation and avoiding narrow diameter orifice limitations, with a design that includes a long, curved capillary providing a continuous pressure drop without abrupt disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a fixed orifice is used to reduce pressure, then pressure regulation is accurate and inexpensive, but precipitation forms on the orifice due to abrupt flow disruption
Solution Approach 1:
The patent replaces the traditional sharp-edged orifice with a curved, tapered passage. The gradual curvature of the flow path eliminates abrupt flow disruptions, preventing precipitation formation while maintaining pressure regulation functionality. The curved geometry allows fluid to transition smoothly, avoiding the conditions that lead to condensation and precipitate accumulation.
Solution Approach 2:
The patent changes the geometric parameters of the flow restriction element from a fixed sharp orifice to a tapered passage with gradually varying cross-sectional area. This parameter change transforms the flow characteristics from abrupt to gradual, eliminating precipitation while maintaining the pressure reduction function. The tapered geometry provides a continuous pressure drop rather than a sudden step change.
2Stress or pressure
If a very small orifice is used for precise pressure drop, then pressure regulation is improved, but even small quantities of precipitate can block the orifice entirely
Solution Approach 1:
The tapered, curved passage design eliminates sharp edges and abrupt constrictions that cause precipitate accumulation. The smooth curvature prevents precipitate formation in the first place, and the gradually varying cross-section ensures that even if precipitate forms, it cannot accumulate to blockage levels as it would in a sharp orifice geometry.
Solution Approach 2:
The flow restriction function is segmented into multiple incremental restrictions along the tapered passage rather than a single sharp orifice. This segmentation distributes the pressure drop across multiple small steps, preventing the formation of conditions that lead to precipitate accumulation and blockage while maintaining overall pressure control.
3Stress or pressure
If a fixed orifice is used to reduce pressure further, then pressure regulation is achieved, but abrupt flow disruption causes precipitation that impacts device performance
Solution Approach 1:
The curved tapered passage eliminates abrupt flow disruptions while maintaining effective pressure reduction. The smooth curvature allows the fluid to decelerate gradually, converting kinetic energy to pressure drop without creating the conditions for precipitation that would harm device performance. This maintains both pressure reduction efficacy and device productivity.
Solution Approach 2:
The patent changes the flow restriction mechanism from abrupt geometric discontinuity to gradual parameter variation along the passage length. This continuous parameter change achieves the necessary pressure reduction while avoiding the harmful flow disruptions that cause precipitation and performance degradation.
4Stress or pressure
If a diaphragm regulator is used to reduce pressure to 11 in H2O, then pressure reduction is achieved, but reliability is poor at pressures much below 11 in H2O
Solution Approach 1:
The curved tapered passage provides a more reliable flow restriction mechanism at low pressures compared to diaphragm regulators. The passive geometric restriction maintains consistent flow characteristics across the full pressure range, including the critical low-pressure region below 11 in H2O, where diaphragm regulators exhibit poor reliability.
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 solution effectively reduces fluid pressure in CO2 insect traps, reducing the likelihood of condensation obstruction and maintaining device performance by ensuring a gradual pressure reduction, thus preventing blockages and enhancing reliability.
Implementation Method 1
The head loss is caused by shear and frictional losses in the capillary
Implementation Method 2
The head loss is caused by shear and frictional losses in the capillary
Implementation Method 3
it is less likely that condensation is formed at a single point within the restrictor
Data Source
AI summary
A flow restrictor is provided to reduce pressure in the flow of a fluid, such as a hydrocarbon-based fuel. The flow restrictor takes the form of a capillary that is void of any abrupt flow disruptions. The flow restrictor may be used in place of an orifice and provides the advantage that it has a larger diameter than an orifice of similar function. Precipitation is less likely to form on the restrictor and any precipitation is less likely to have an adverse affect on performance.