Air-Permeable Water Non-Permeable Unit Mounting Design
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Solution Overview
Problem
Existing air-permeable water non-permeable devices with separate units mounted onto a housing through-hole face challenges in balancing mounting operability and stability, often resulting in easy dislodgment or difficulty in mounting.
Innovation Solution
An air-permeable water non-permeable device comprising a rubber outer case, a rubber inner case, and an air-permeable water non-permeable sheet, where the outer case has a cylindrical portion with a retainer flange and through-holed base, and the inner case is a through-holed cylindrical body, allowing for easy mounting with sufficient strength through specific diameter and tapered surfaces, ensuring secure retention within a housing through-hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an air-permeable water non-permeable sheet is retained by a separate unit that is mounted onto a housing through-hole, then the mounting operability is improved, but the stability (ability to prevent the unit from falling out) deteriorates
Solution Approach 1:
The air-permeable water non-permeable sheet is nested between the inner case and the through-holed base portion, creating a multi-layer structured unit that combines multiple functions (retention, mounting, and filtration) into a single integrated assembly, thereby improving both mounting operability and stability
2Ease of operation
If the unit is designed for easy mounting, then the mounting operability is improved, but the unit easily falls out (stability deteriorates)
Solution Approach 1:
The outer case includes a cylindrical portion with a specific curved geometry that fits into the mounting through-hole, providing both easy insertion and secure retention through the geometric interlocking of the cylindrical shape with the housing aperture
3Reliability
If the unit is designed for high stability to prevent falling out, then the stability is improved, but the unit becomes difficult to mount (mounting operability deteriorates)
Solution Approach 1:
The outer case is segmented into distinct functional portions: a cylindrical portion for insertion, a retainer flange portion for retention, and a through-holed base portion for mounting. This segmentation allows each portion to be optimized for its specific function, enabling both easy mounting and high stability
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 device achieves easy mounting with enhanced stability, preventing the unit from falling out while maintaining air permeability and water resistance, with superior moldability and assembling capabilities.
Implementation Method 1
An air-permeable water non-permeable sheet (membrane member/film member), through which liquid is not allowed to pass and air (gas) is allowed to pass
Implementation Method 2
air-permeable water non-permeable sheet (water-repellent microporous material)
Data Source
AI summary
An air-permeable water non-permeable device includes a unit including a rubber outer case, a rubber inner case, and an air-permeable water non-permeable sheet sandwiched therebetween; and a housing. The inner case is fitted inside a cylindrical portion of the outer case, the air-permeable water non-permeable sheet being sandwiched between a through-holed base portion of the outer case and a through-holed cylindrical body of the inner case. The through-holed base portion of the outer case faces a mounting through-hole of the housing and the retainer flange portion is externally orientated. The outer case is provided with an insertion guidance small-diameter portion which is not compressed by the retainer inner cylindrical surface and is smaller in diameter than the retainer inner cylindrical surface, and a retainer large-diameter portion which is compressed by the retainer inner cylindrical surface and is larger in diameter than the retainer inner cylindrical surface.