Vehicle Air Filter Ionizer Layout for Long-Life Particle Filtration
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Solution Overview
Problem
Existing air filter systems for vehicles struggle to maintain effective filtration of particles over the entire service life of the filter medium, leading to increased exposure to pollutants as the electrostatic charge diminishes over time.
Innovation Solution
An air filter unit equipped with an ionizer and a filter medium that includes an outer electret layer, a mechanically filtering layer, an inner electret layer, and an electrically conductive layer, which maintains electrostatic filtering effectiveness throughout its service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatically charged filter medium is used to effectively filter particles, then the filtration effectiveness is improved, but the electrostatic charge diminishes quickly as the filter ages and accumulates dust, reducing effectiveness over time
Solution Approach 1:
The ionizer pre-charges incoming air ions before they reach the filter medium, creating a continuous supply of charged particles that can be captured by the filter's electrostatic field. This preliminary ionization action ensures that the filter maintains its electrostatic filtering capability throughout its service life, rather than relying solely on the filter's initial charge which would diminish over time.
Solution Approach 2:
The ionizer acts as an intermediary device between the incoming air and the filter medium. It generates ions that serve as a bridge, allowing the filter to continuously capture charged particles without depleting its own electrostatic charge. The ionizer replenishes the charged particle supply, enabling the filter to maintain consistent filtration effectiveness throughout its operational life.
2Reliability
If a fiber filter layer is used to remove dust, then the filtration is improved, but the flow resistance increases, reducing air supply adequacy
Solution Approach 1:
The filter medium utilizes a porous structure with carefully controlled pore sizes and distributions. This porous design allows air to flow through while capturing particles via electrostatic forces. The porosity is optimized to maintain low flow resistance while ensuring adequate particle capture, resolving the contradiction between filtration effectiveness and air supply adequacy.
3Productivity
If the filter medium is made open-celled to reduce flow resistance, then the air supply is improved, but the filtering effect is reduced
Solution Approach 1:
The filter system combines the open-celled filter medium with the ionizer to create a composite filtering system. The open-celled structure provides low flow resistance and high air throughput, while the ionizer compensates for the reduced filtering effect by pre-charging particles. This composite approach allows both high productivity and maintained filtration effectiveness.
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 proposed air filter unit achieves high-level particle filtration throughout its service life with low pressure losses, ensuring cleaner air for passengers and maintaining filtration efficiency comparable to conventional filters.
Implementation Method 1
the at least one ionizer contains at least one discharge electrode, at least one counter-electrode, and at least one power source
Implementation Method 2
Filter media that attract electrostatically charged particles
Implementation Method 3
Filter media that attract electrostatically charged particles for overcoming this problem
Data Source
AI summary
An air filter unit is provided and contains,at least one ionizer, andat least one filter medium, wherein the at least one ionizer contains at least one discharge electrode, at least one counter-electrode, and at least one voltage source, and wherein the at least one filter medium is downstream of the ionizer, and contains, starting from the upstream side, at least one electret layer, at least one mechanically filtering layer, at least one inner electret layer, and at least one electrically conductive layer. The use of such an air filter unit in a motor vehicle is also provided.