Balloon Vent Seal Structure for Pressure Equalization and Gas Blocking
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Solution Overview
Problem
Existing sealed electronic enclosures suffer from pressure differential issues that can cause damage to components and allow harmful gases and particulates to enter, blocking the vent.
Innovation Solution
A vent seal with a flexible barrier and air router that equalizes pressure while preventing gas entry and particulate collection, using a balloon portion that expands or collapses based on pressure differential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a vent is provided to equalize pressure between the interior and exterior of the enclosure, then pressure differential damage to electronic components is prevented, but harmful or corrosive gases can enter the interior of the enclosure through the vent
Solution Approach 1:
A hydrophobic barrier is introduced as an intermediary component between the vent opening and the enclosure interior. This barrier selectively allows air molecules to pass through while blocking harmful gases and particulates, resolving the contradiction by mediating between pressure equalization needs and contamination prevention
Solution Approach 2:
The hydrophobic barrier is implemented as a flexible membrane that can deform in response to pressure differentials. The flexible nature allows the barrier to expand and contract with pressure changes while maintaining its gas-blocking properties, enabling both pressure equalization and contamination prevention
2Stress or pressure
If a vent is provided to equalize pressure between the interior and exterior of the enclosure, then pressure differential damage to electronic components is prevented, but particulates can collect near the vent opening and block the vent
Solution Approach 1:
The hydrophobic barrier acts as a mediator that prevents particulates from reaching the vent opening while still allowing air to pass through. This resolves the contradiction by blocking the path of harmful particulates without interfering with the pressure equalization function
Solution Approach 2:
The hydrophobic coating is applied in advance to the barrier surface, creating a preliminary protective layer that repels particulates before they can accumulate and block the vent. This preventive measure addresses the contradiction by stopping particulate accumulation before it becomes a problem
3Object-affected harmful factors
If a barrier is used to prevent harmful gases from entering the enclosure, then gas protection is improved, but the barrier may allow particulates to block the vent opening
Solution Approach 1:
The flexible hydrophobic barrier membrane provides gas protection while its flexible nature and hydrophobic properties prevent particulate accumulation. The flexibility allows it to maintain its protective function without creating a rigid structure that could be blocked by particulates
Solution Approach 2:
The hydrophobic coating changes the surface energy parameters of the barrier, making it repellant to particulates while remaining permeable to air molecules. This parameter change resolves the contradiction by creating a surface that simultaneously blocks gases and repels particulates
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
Effectively equalizes pressure and prevents harmful gases and particulates from entering the enclosure, maintaining component safety and functionality.
Implementation Method 1
The barrier is preferably provided with a hydrophobic coating that repels water and which further allows the passage of air molecules therethrough
Implementation Method 2
The barrier is capable of expanding or collapsing depending upon the differential in air pressure between the interior of the enclosure and the outside environment
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
Disclosed herein is a novel design of a vent seal for a sealed electronics component enclosure. The vent seal comprises a rubber element defining balloon portion which extends through an opening in the wall of the enclosure. The balloon portion expands into the interior of the enclosure when the air pressure outside of the enclosure rises and collapses when the pressure outside of the enclosure falls. The vent seal is also provided with an air router that allows the easy passage of air into the interior of the balloon portion, while inhibiting particulates from entering the interior of the balloon portion to prevent interference with the functioning of the vent seal.