Electrostatic Foam Air Filter for Multi-Pollutant Capture
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Solution Overview
Problem
Current air filters are inadequate in effectively filtering volatile organic compounds (VOC), carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), particulate organic carbon (POC), and microorganisms, while also requiring complex provisioning and high energy consumption.
Innovation Solution
An air filter with a foam filter element made of porous material exhibiting inherent electrostatic triboelectric charging characteristics, which generates a static charge upon air friction, allowing for improved filtration of particles without additional coatings or energy-intensive processes, and featuring multiple layers with varying cell densities to optimize particle capture and airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional air filters are used for dust removal, then basic filtration is achieved, but filtration of VOC, CO, SO2, NOx, POC particles and microorganisms is inadequate
Solution Approach 1:
The patent applies composite materials by combining foam filter material with electrostatic charge characteristics. The foam material serves as the base structure for particle capture, while the electrostatic charge enhances attraction of charged particles (VOC, CO, SO2, NOx, POC). This composite approach improves filtration efficiency for multiple pollutant types without requiring multiple separate filter stages, thus avoiding increased device complexity.
2Reliability
If electrostatic coatings are applied to enhance particle filtration, then filtration efficiency improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs self-service by utilizing the foam filter material's inherent ability to generate electrostatic charge through triboelectric effect during normal air flow operation. The material charges itself automatically as air passes through, eliminating the need for external electrostatic coating applications, complex charging mechanisms, or additional manufacturing steps. This self-charging property achieves enhanced particle filtration while maintaining manufacturing simplicity.
3Reliability
If high-density foam material is used to improve particle capture, then filtration efficiency increases, but pressure drop and energy consumption increase
Solution Approach 1:
The patent applies parameter changes by utilizing the electrostatic charge density as an adjustable parameter to enhance particle capture efficiency. The electrostatic attraction force depends on charge density, which can be optimized to achieve high filtration efficiency without requiring excessively high foam density. This allows maintaining lower pressure drop and energy consumption while still achieving effective particle capture through electrostatic forces.
4Reliability
If multiple filter layers with different cell densities are implemented, then particle capture across different sizes improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by creating zones with different electrostatic charge densities within the foam structure. Different regions of the foam material can have varying charge characteristics that correspond to different particle size ranges. This allows the single foam element to handle multiple particle sizes effectively without requiring multiple physical layers, thus improving multi-size particle capture while avoiding increased device complexity.
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 air filter achieves enhanced filtration efficiency for particles of different sizes, minimizes energy consumption, and extends the filter's lifespan by efficiently capturing charged particles and maintaining effective airflow, while being easily installable with minimal hardware modifications.
Implementation Method 1
the foam filter material becomes electrically charged due to the air friction of the air flowing through the foam filter material
Implementation Method 2
any charged particles passing through the electrostatically charged foam element are electrostatically withdrawn from the passing gases and captured on the charged surface regions
Data Source
AI summary
The invention relates to an air filter for an air treatment system of a vehicle and method for manufacturing such an air filter (1), the air filter (1) comprising at least one foam filter element (2), wherein the foam filter material is or comprises a material with inherent electrostatic triboelectric charging characteristics, and to a method for manufacturing such an air filter.