Liquid Ingress Control Structure for Splash-Free Immersion Activation
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Solution Overview
Problem
Existing systems for controlling liquid ingress into sealed containers, such as life jackets, often result in false activations due to splashing or rain, and require frequent maintenance, while hydrostatic activation systems are costly and can be delayed by buoyant clothing, leading to inefficient immersion detection.
Innovation Solution
A liquid-ingress control device with a casing and cap design featuring a liquid entry port tube and flow apertures that allow water entry only when the device is submerged, preventing ingress until sufficient immersion occurs, and a flange that prevents water entry through capillary action or surface tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid substance (compressed dissolvable powder or highly compressed paper drum) is used to resist spring force, then activation is enabled, but false activation occurs due to hydrophilic nature causing fail on minor water ingress
Solution Approach 1:
The invention divides the water resistance function into two separate components: a hydrophobic coating on the solid substance to prevent water ingress, and a dedicated water entry port with specific geometric features (tube and flange) to control water entry. This segmentation allows each component to specialize in one function, improving overall reliability.
Solution Approach 2:
The hydrophobic coating acts as an intermediary layer between the solid substance and water, preventing water from contacting the hydrophilic material. The water entry port structure (tube and flange) serves as an intermediary mechanism that mediates water entry, allowing it only under specific conditions (complete immersion) rather than direct contact.
2Reliability
If a hydrostatic activation system is used to prevent false activations, then reliability improves, but cost increases by two and four times compared to conventional units
Solution Approach 1:
The invention replaces the expensive hydrostatic activation system with a simpler, cheaper trigger mechanism that uses a disposable solid substance (pellet or paper drum) combined with a hydrophobic coating and simple geometric water entry control features. This achieves similar reliability at a fraction of the cost.
Solution Approach 2:
The invention replaces the complex hydrostatic mechanical system with a simpler chemical/physical system combining hydrophobic coating properties and capillary action control through geometric features. This substitution eliminates the need for expensive hydrostatic components while achieving the same false activation prevention.
3Reliability
If a hydrostatic activation system is used, then false activations are prevented, but activation may be delayed due to insufficient immersion depth when buoyant clothing is worn
Solution Approach 1:
The invention changes the water entry control parameter from depth-based (hydrostatic) to orientation-based (capillary action through tube and flange geometry). This allows water entry at shallower immersion depths, reducing activation delay while maintaining false activation prevention through the hydrophobic coating and controlled capillary action.
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 effectively prevents false activations by ensuring liquid entry only upon complete immersion, reducing maintenance needs and avoiding costly delays, while maintaining the reliability of immersion detection.
Implementation Method 1
the cap comprising at least two flow apertures positioned such that liquid contained within the cap space is capable of egress under gravity from the cap space, independently of the orientation of the device
Implementation Method 2
a flange that prevents water entry through capillary action or surface tension
Implementation Method 3
a flange that prevents water entry through capillary action or surface tension
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A liquid-ingress control device, comprising a casing having an interior and an exterior, and optionally a liquid-activated trigger positioned in the casing interior; the casing comprising an exterior liquid entry control surface defined by a perimeter in sealing relationship with an edge of a cap, the cap having an interior cap surface formed to define a cap space between the interior cap surface and the liquid entry control surface; the liquid entry control surface comprising a liquid entry port comprising a tube extending between the exterior and interior of the casing through an aperture formed in the entry control surface, the tube optionally comprising a flange positioned exterior to the casing; the cap comprising at least two flow apertures positioned such that liquid contained within the cap space is capable of egress under gravity from the cap space, independently of the orientation of the device.