Deploying Balloon Vent for Liquid Dispensing Containers
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Solution Overview
Problem
Conventional air vents in liquid dispensing containers can be prone to leakage and failure due to head pressure and material degradation, leading to vacuum formation and impaired liquid dispensing.
Innovation Solution
A deploying balloon vent system that allows air into the container through apertures, movable from an undeployed to a deployed state to maintain fluid communication and prevent leakage, with a sheathe that dissolves upon contact with the liquid to protect the balloon material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way air valve is provided in the dispensing cap to allow air into the container, then vacuum formation is prevented, but the valve can be pressed closed by head pressure in certain orientations and becomes prone to leakage
Solution Approach 1:
A hydrophobic barrier (e.g., Teflon-coated screen or membrane) is introduced as an intermediary between the liquid and the air valve. This barrier allows air molecules to pass through while blocking liquid molecules, preventing liquid from reaching and leaking through the air valve while maintaining the valve's ability to function in various orientations
2Reliability
If elastomer components are used in the air valve, then the valve can seal properly, but the elastomer degrades and leaks over time due to contact with liquid contents
Solution Approach 1:
A hydrophobic barrier material serves as an intermediary that protects the elastomer components from direct contact with the liquid contents. The barrier allows air to pass through while blocking liquid, preventing chemical degradation of the elastomer and extending the service life of the valve mechanism
Solution Approach 2:
The hydrophobic barrier is designed as a sacrificial component that can be easily replaced. While the barrier itself may have limited lifespan, it protects the more expensive and longer-lasting elastomer valve components, providing cost-effective protection against degradation
3Reliability
If air is allowed into the container through a vent, then vacuum formation is prevented, but liquid can leak out of the vent in certain orientations
Solution Approach 1:
The vent system incorporates a hydrophobic barrier with spatially differentiated properties: the barrier material allows gas molecules to pass through while blocking liquid molecules based on their different physical properties. This local quality differentiation at the material level enables selective fluid passage, allowing air entry while preventing liquid leakage in any orientation
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 balloon vent system effectively prevents vacuum formation and leakage by allowing air entry while maintaining compatibility with the liquid contents, ensuring reliable dispensing across varying orientations and container states.
Implementation Method 1
When liquid is dispensed from the container, the deploying balloon allows air into the container
Implementation Method 2
The deploying balloon can also be temporarily contained in a sheathe that dissolves upon contact with the liquid in the container
Data Source
AI summary
A liquid dispenser includes a container having an interior adapted to hold a fluid. An air vent is coupled to the container, and a balloon is disposed in the container and in fluid communication with the air vent to provide selective fluid communication between the interior and an exterior of the container, the balloon movable from an undeployed state to a deployed state, and the balloon in the deployed state having a position in which the balloon establishes fluid communication between the exterior of the container and the interior of the container.