Vehicle Lighting Ventilation via Hydrophobic Filter Membrane
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Solution Overview
Problem
Existing ventilation systems for vehicle lighting and signaling devices are inadequate for cooling and are complex and costly to produce, as they generate significant pressure drops and require restrictive arrangements on the casing to prevent water entry during high-pressure washing.
Innovation Solution
A ventilation system with a planar wall and a filtering membrane that allows for easy assembly and disassembly, using a perforated wall to hold the filter in place, which facilitates air flow and prevents solid or liquid elements from entering, while being simple to mount and maintain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a winding air passage with serpentine path is used to prevent water entry, then water prevention is improved, but pressure drop increases and cooling efficiency deteriorates
Solution Approach 1:
The ventilation system is divided into multiple independent channels (first ventilation channel, second ventilation channel, third ventilation channel) instead of using a single winding path. Each channel provides a direct air passage while collectively achieving water prevention through the hydrophobic filter membrane, thereby reducing pressure drop while maintaining reliability
Solution Approach 2:
A hydrophobic filter membrane is introduced as an intermediary element that selectively allows air molecules to pass through while blocking water molecules. This mediator enables direct ventilation channels to achieve both cooling efficiency and water prevention simultaneously, eliminating the need for winding paths
2Reliability
If restrictive arrangements are made on the wall to prevent water entry, then water prevention is improved, but device complexity and production cost increase
Solution Approach 1:
The hydrophobic filter membrane serves multiple functions simultaneously: it acts as a water barrier, an air filter, and a flow regulator. This multi-functional element eliminates the need for separate water prevention structures, recesses, and complex wall arrangements, thereby reducing device complexity while maintaining water prevention capability
Solution Approach 2:
The hydrophobic filter membrane utilizes porous material properties to achieve selective permeability - allowing air to pass through while blocking water. This material-based solution replaces complex geometric arrangements and mechanical water barriers, simplifying the overall casing design and reducing production complexity
3Reliability
If a small passage section is used with a baffle to prevent water entry, then water prevention is improved, but ventilation efficiency and cooling capability deteriorate
Solution Approach 1:
The hydrophobic filter membrane acts as a mediator that enables large passage sections to achieve water prevention without requiring restrictive baffles or small openings. Multiple parallel ventilation channels with large cross-sections can be implemented while the hydrophobic membrane ensures water prevention, thereby maintaining high ventilation efficiency and productivity
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 system effectively channels a greater air flow for cooling, simplifies the mounting process, and allows for easy filter replacement, improving the efficiency and cost-effectiveness of ventilation while maintaining water prevention.
Implementation Method 1
The ventilation (4) comprises a filter (18), arranged so that the air passes through the filter (18) when it circulates from the inlet (21) to the outlet (23) or vice versa
Data Source
Figure 1~3
Figure 4~5
AI summary
The ventilation (4) has an envelope (5) defining an interior volume (24) with an input and an output and arranged to allow air circulation of the input toward the output or conversely. A reversible fixing unit (12) fixes the envelope to a wall of the casing. The envelope includes a seat (15) to receive a filter. The filter includes a filtering membrane (18), and the seat forms a shoulder intended to receive an edge of the filtering membrane. The envelope includes studs (22) for a central part of the membrane.