Gas Sensor Filter with Selective Hole Blocking
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Solution Overview
Problem
Conventional filters for gas sensors face challenges in effectively allowing target gases like hydrogen to pass through while preventing non-target substances such as water and oil from entering, requiring improved characteristics like high water repellency, breathability, chemical resistance, and corrosion resistance.
Innovation Solution
A filter design comprising a first porous layer with holes and a second layer that blocks some of these holes, using a fluorine compound like PTFE for the first layer and an acrylic resin for the second layer, which allows hydrogen to permeate while suppressing the entry of non-target substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a filter uses a porous structure to allow gas passage, then breathability is improved, but water and oil resistance deteriorates
Solution Approach 1:
The filter applies different surface treatments to different regions or aspects of the same porous structure. The hydrophobic/oleophobic coating is applied selectively to the inner surface of the porous layer, creating local differentiation where the bulk structure remains porous for breathability while the coated surface provides water and oil resistance.
Solution Approach 2:
The filter combines multiple materials with complementary properties: a porous base material (such as PTFE or other fluorinated polymers) providing breathability, combined with a hydrophobic/oleophobic coating material that provides water and oil resistance. This composite structure allows simultaneous achievement of both requirements.
2Object-affected harmful factors
If a filter uses a dense structure to block liquids, then water repellency is improved, but gas permeability deteriorates
Solution Approach 1:
The filter employs a porous material structure where the pore size and distribution are controlled to allow gas molecules to pass through while preventing larger liquid molecules from entering. The porous structure inherently provides gas permeability, and when combined with hydrophobic/oleophobic coating, achieves both liquid blocking and gas passage.
Solution Approach 2:
The filter utilizes changes in surface energy parameters through hydrophobic/oleophobic coating, which alters the interaction between the filter surface and liquids. This parameter change allows the same porous structure to exhibit different permeability characteristics for gases versus liquids, enabling high water repellency without sacrificing gas permeability.
3Object-affected harmful factors
If a filter uses chemical treatments to enhance resistance, then chemical resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The filter achieves enhanced chemical resistance by modifying surface energy parameters through hydrophobic/oleophobic coating rather than through complex chemical treatments. This approach provides broad-spectrum chemical resistance with a relatively simple manufacturing process involving coating application and curing.
Solution Approach 2:
The hydrophobic/oleophobic coating serves multiple functions simultaneously: it provides water resistance, oil resistance, and broad-spectrum chemical resistance. This multi-functionality reduces the need for multiple separate treatments, thereby simplifying the overall manufacturing process while achieving comprehensive resistance properties.
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 filter achieves high permeability for hydrogen and low permeability for non-target substances, ensuring efficient gas detection and maintaining filter reliability with enhanced water, oil, and dust resistance.
Implementation Method 1
The first layer includes a first resin provided with a plurality of holes. The first layer includes a first face. At least a part of the plurality of holes reaches the first face. The second layer includes a second resin. The second resin blocks at least a part of the plurality of holes reaching the first face.
Data Source
AI summary
According to one embodiment, a filter includes a first layer and a second layer. The first layer includes a first resin provided with a plurality of holes. The first layer includes a first face. At least a part of the plurality of holes reaches the first face. The second layer includes a second resin. The second resin blocks at least a part of the plurality of holes reaching the first face.