Ventilation Housing With Nested Tubular Assembly
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Solution Overview
Problem
Ventilation assemblies for in-vehicle and electronic devices face challenges in maintaining effective moisture permeation while preventing dropping from housing projections, requiring a balance between ventilation performance and structural stability.
Innovation Solution
A ventilation housing design featuring a tubular projection with a ventilation assembly that includes a gas-permeable membrane and a tubular external member, where the internal member is inserted into the external member, and the assembly is fixed with a specific height and ratio of the internal member to the projection, ensuring effective moisture permeation and preventing dropping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ventilation assembly is designed with a gas-permeable membrane and tubular structure to ensure moisture permeation, then ventilation performance is improved, but the assembly becomes prone to dropping from the housing projection
Solution Approach 1:
The ventilation assembly employs a nested structure where the internal member is inserted into the external member, creating a stable integrated assembly that prevents dropping while maintaining moisture permeation through the gas-permeable membrane on the internal member
Solution Approach 2:
The invention adds dimensional stability by creating a multi-layered tubular structure with specific height ratios. The internal member height (H1) and external member height (H2) are designed with a specific ratio range (0.5 ≤ H1/H2 < 1.0), adding structural dimensionality that prevents dropping while preserving ventilation function
2Reliability
If the internal member height is increased to improve moisture permeation, then ventilation performance is enhanced, but the assembly becomes more likely to drop from the projection
Solution Approach 1:
The invention optimizes the height parameters of the internal and external members by establishing a specific ratio range (0.5 ≤ H1/H2 < 1.0). This parameter control ensures that the internal member is tall enough to provide effective moisture permeation while not being excessively tall to cause dropping, thus balancing ventilation performance with manufacturing precision
3Ease of manufacture
If the ventilation assembly structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but the assembly becomes prone to dropping and ventilation performance decreases
Solution Approach 1:
The ventilation assembly is segmented into distinct functional components: the internal member with gas-permeable membrane for moisture permeation, and the external member for structural support and protection. This segmentation allows each part to be manufactured independently with standard processes while maintaining overall performance and stability when assembled
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 design achieves excellent moisture permeation performance while reducing the risk of the ventilation assembly dropping from the housing projection, ensuring reliable ventilation and protection against foreign matter entry.
Implementation Method 1
a gas-permeable membrane covering the opening at the first end portion of the internal member
Data Source
AI summary
A ventilation housing of the present disclosure includes: a housing; and a ventilation assembly. The housing includes a tubular projection extending to project from an outer surface and internally having a first space communicating the inside and the outside of the housing. The ventilation assembly includes: an internal member being a tubular body having an opening at a first end portion and an opening at a second end portion; a gas-permeable membrane covering the opening at the first end portion of the internal member; and an external member being a tubular body having a bottom, the external member being joined to the internal member with the internal member inserted in the interior of the external member from the first end portion side. The ventilation assembly is fixed to the projection with the projection inserted in the opening at the second end portion of the internal member to make an inner peripheral surface of the internal member and an outer peripheral surface of the projection abut each other. The ventilation assembly has a second space serving as a ventilation path connecting the gas-permeable membrane and the outside of the ventilation assembly in the inside of the internal member, the inside of the external member, and/or an interspace between the internal member and the external member joined together. A height H1 of the internal member is 6 to 10 mm. A ratio of the height H1 of the internal member to a height H2 of the projection is 1.00 to 1.70. The ventilation housing of the present disclosure exhibits excellent performance in terms of moisture permeation between the inside and the outside of the housing and is capable of reducing dropping of the ventilation assembly from the projection of the housing.