Ventilation Member Welding Layout for Higher Pressure Equalization
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Solution Overview
Problem
Conventional ventilation members face challenges in enhancing internal pressure regulation without compromising dust/water-proof performance due to limitations in gas permeability and membrane area, especially with the miniaturization of housings.
Innovation Solution
A ventilation member design featuring a gas-permeable sheet welded only in the outer peripheral region of the vent hole's opening end face, maintaining a non-bonding state in the inner peripheral region to increase the effective gas-permeable area without enlarging the membrane or vent hole size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the area of the porous membrane is enlarged to improve differential pressure elimination capability, then the ventilation performance is improved, but the dust/water-proof performance deteriorates
Solution Approach 1:
The vent hole opening end face is divided into two distinct regions: an outer peripheral region where the porous membrane is bonded to provide sealing, and an inner peripheral region where the porous membrane remains unbonded to provide gas permeability. This segmentation allows each region to fulfill its specific function without compromising the other, resolving the contradiction between ventilation performance and dust/water-proof performance.
2Productivity
If the gas permeability of the porous membrane is improved to enhance ventilation performance, then the differential pressure elimination capability is improved, but the membrane area must be reduced to maintain dust/water-proof performance
Solution Approach 1:
The porous membrane exhibits different functional qualities in different regions: the outer peripheral region provides sealing quality through bonding, while the inner peripheral region provides gas permeability quality through remaining unbonded. This local differentiation of quality allows the membrane to simultaneously achieve both dust/water-proof performance and high ventilation performance without requiring a larger membrane area.
3Strength
If insert molding is used to bond the porous membrane to the main body, then the bonding strength is improved, but the gas-permeable area is reduced due to crushing between pins
Solution Approach 1:
The bonding function is extracted from the entire membrane area and concentrated only in the outer peripheral region. The inner peripheral region is explicitly excluded from bonding, preserving its gas-permeable properties. This extraction approach eliminates the problem of pin crushing reducing the gas-permeable area while still providing sufficient bonding strength through the outer peripheral bonding region.
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 design improves differential pressure elimination capability while maintaining dust/water-proof performance and resistance to water pressure, achieving higher ventilation performance without enlarging the sheet or vent hole area.
Implementation Method 1
a gas-permeable sheet and a support body having a vent hole for connecting an exterior space with a space to be ventilated, the vent hole being closed by the sheet
Implementation Method 2
the sheet is welded to the support body in an outer peripheral region of an opening end face of the vent hole, forming a ring-shaped welded portion
Data Source
AI summary
A ventilation member 13 includes a gas-permeable sheet 6 and a support body 11 in which a through-hole 11h is formed. One opening of the through-hole 11h is closed by the sheet 6. As a face to which the sheet 6 is to be attached, the support body 11 has a ring-shaped opening end face 12 parallel to the in-plane direction of the sheet 6. In an outer peripheral region 12j of the opening end face 12, the sheet 6 is welded to the support body 11, forming a ring-shaped welded portion 15. The sheet 6 is not welded to the support body 11 in an inner peripheral region 12k of the opening end face 12. The inner peripheral region 12k is surrounded by the welded portion 15.