Ionized Cabin Air Filter Layout for Long-Life Fine Particle Capture
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Solution Overview
Problem
Existing air filters in vehicle air conditioners struggle to maintain effective filtration of fine particulates in urban environments over long periods without requiring special maintenance, as the electrostatic charge in filter elements weakens over time.
Innovation Solution
An air filter design for vehicle air conditioners that includes an ionizer in the airflow path and an electrostatically charged filter element downstream, where the counter electrode of the ionizer is connected to an electrically conductive filter layer, enhancing polarization and maintaining filtering capacity and service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatically charged filter element is used to filter fine particulates, then filtering capacity for particles less than 0.3 μm is improved, but the electrostatic charge weakens over time as the filter element deteriorates and becomes clogged
Solution Approach 1:
An ionizer is installed upstream of the filter element to pre-charge air molecules and particles before they reach the filter. This preliminary ionization action ensures that particles are charged before filtration, compensating for the weakening electrostatic charge in the filter element over time and maintaining effective filtration throughout the service life.
Solution Approach 2:
The ionizer acts as an intermediary device between the air intake and the filter element. It generates ions that mediate the charging process, allowing particles to be charged through interaction with ions rather than relying solely on the filter element's own electrostatic charge, thus extending the filter's effective service life.
2Reliability
If ionizers are used to counteract weakening electrostatic charge, then filtering effect is improved, but the air filter eventually fails to satisfy filtering capacity requirements and requires maintenance or replacement
Solution Approach 1:
The ionizer and filter element are merged into a single integrated air filter unit. The ionizer's electrode is electrically connected to a conductive layer in the filter element, creating a unified system where the electrostatic field spans both components. This integration allows the system to maintain effective particle charging and filtration throughout the extended service life without requiring separate maintenance of ionizer and filter.
Solution Approach 2:
The electrical connection between the ionizer electrode and the filter element's conductive layer creates a unified electrostatic field with modified field distribution. This parameter change in the electrostatic field configuration allows the system to maintain effective particle charging and filtration throughout the extended service life without requiring separate maintenance of ionizer and filter.
3Duration of action of stationary object
If a conductive layer is added to the filter element and electrically connected to the ionizer, then polarization effect is improved and filtering capacity is extended, but device complexity increases
Solution Approach 1:
The conductive layer in the filter element serves multiple functions: it acts as part of the filtration structure, provides electrical connection between the ionizer and filter, and creates the extended electrostatic field. This multi-functionality reduces the need for separate components and minimizes overall device complexity while achieving the goal of extended service life.
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 significantly improves filtering capacity and service life by maintaining a strong electrostatic field, effectively removing fine particulates even when the filter element is old, thus providing better air quality in vehicle compartments over extended periods.
Implementation Method 1
the ionizer (10) contains at least one electrode (11) which can be connected to a high voltage source (4) for the air filter (1) to generate a corona discharge in the air flow (30)
Implementation Method 2
an electrostatically charged filter element (20) downstream of the ionizer (10) in the flow path (32) for filtering the air flow (30)
Implementation Method 3
the at least one counter electrode (15) is electrically connected to a conductive filter layer (21) in the filter element (20)
Data Source
AI summary
An air filter, through which a flow path for an air flow passes is provided, wherein the air filter contains an ionizer in the flow path for ionizing the air flow, in particular for ionizing the particles therein, and an electrostatically charged filter element downstream of the ionizer in the flow path for filtering the air flow, such that the air flow can pass through the ionizer and the filter element, wherein the ionizer contains an electrode that can be connected to a high voltage source for the air filter to generate a corona discharge in the air flow, and a counter electrode dedicated to the at least one electrode. Essential to the invention is that the at least one counter electrode is electrically connected to an electrically conductive filter layer in the filter element.A vehicle air conditioner that is equipped with at least one such air filter is provided.