Breathable Membrane Venting and Sealing Assembly for Portable Devices
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Solution Overview
Problem
Portable communication devices face challenges in maintaining appropriate venting and sealing, especially in severe environmental conditions, as existing solutions are either passive and offer no protection in wet environments or have large venting structures that are prone to leaks and alignment issues during testing.
Innovation Solution
A venting and sealing assembly featuring a passive pressure equalization vent with a breathable membrane and an active sealing valve mechanism, comprising a flexible or rigid moveable substrate with a closed-loop sealing rib, which automatically seals to create a pressure-sensitive barrier, addressing space constraints and ensuring waterproofing without the need for membrane removal during testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air hole structures are used for venting, then venting function is provided, but sealing capability is lost and protection in wet environments is eliminated
Solution Approach 1:
The venting structure transitions from a static air hole to a dynamic system where the breathable membrane can move and the moveable substrate can shift position. The membrane breathes in response to pressure differentials, opening or closing the vent path dynamically based on environmental conditions, thus providing both venting and sealing capabilities
Solution Approach 2:
The system changes the state of the venting structure based on pressure parameters. When pressure differential exceeds a threshold, the membrane breathes and venting occurs; when pressure equalizes, the membrane returns to sealed position. This parameter-based control allows the same structure to provide both venting and sealing functions
2Ease of operation
If membranes are removed for test purposes, then testing access is improved, but re-alignment issues and potential leak issues occur
Solution Approach 1:
The testing function is separated from the membrane itself. A separate test port or access mechanism is provided that allows testing without disturbing the membrane's position or integrity. The membrane remains permanently installed and sealed, while independent test access is created through other means
Solution Approach 2:
An intermediary testing mechanism is introduced that provides access to the sealed environment without requiring membrane removal. This intermediary system allows testing while the membrane remains in place, eliminating re-alignment issues and maintaining sealing integrity
3Ease of manufacture
If large venting structures are used, then venting capability is improved, but real estate is consumed and leak issues arise
Solution Approach 1:
The rigid large venting structure is replaced with a flexible breathable membrane. This thin film provides the necessary venting capability through its breathable properties while occupying minimal space. The membrane's flexibility allows it to conform to small openings and provide effective venting without consuming valuable real estate
Solution Approach 2:
The solid venting structure is replaced with a porous breathable membrane material. This porous structure allows air and moisture vapor to pass through while blocking liquid water, providing effective venting capability in a minimal space. The porous nature of the membrane enables gas permeability without requiring large openings
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 provides effective venting and sealing in harsh environments while minimizing space usage and eliminating alignment issues during testing, ensuring reliable operation under varying pressure conditions and water submersion.
Implementation Method 1
a passive pressure equalization vent, formed of a breathable membrane
Implementation Method 2
The active sealing valve mechanism comprises a moveable substrate... which automatically seals to the internal walled aperture or vent path to create a pressure sensitive barrier
Data Source
AI summary
An improved venting and sealing assembly for a portable communication device is provided. The venting and sealing assembly is formed of a housing enclosure having a walled aperture with a bottom surface and an offset through-hole passing therethrough. A flexible substrate having a vent hole is coupled to the housing enclosure across the walled aperture such that the vent hole is offset from the offset through-hole. A breathable membrane is coupled across the vent hole of the flexible substrate. A rigid plate having an opening is coupled to the breathable membrane, the opening of the rigid plate being aligned with the vent hole of the flexible substrate. A closed-loop sealing rib is formed around the vent hole of the flexible substrate and/or upon the bottom surface of the walled aperture of the housing enclosure. The assembly provides a vent path and a self-sealing enclosure.