Electrostatic Air Filter Reactivation for Longer Service Life
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Solution Overview
Problem
Existing air filtration systems in vehicles and air conditioners face challenges in achieving long-lasting and effective filtration of particulates, particularly in highly polluted environments, while requiring significant installation space and potentially causing damage due to voltage issues.
Innovation Solution
The system incorporates an electrostatic filter that is electrically connected to a counter electrode in an ionizer, allowing for the buildup of electrostatic charges in the filter. This connection is managed by a Z-diode, which automatically disconnects when the filter and counter electrode have the same potential, enabling a reactivation mode to maintain the electrostatic charge and improve filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter is continuously electrically connected to the counter electrode to maintain electrostatic charge, then the filtration effectiveness is improved, but the risk of voltage damage and operational reliability deteriorates
Solution Approach 1:
The filter is electrically connected to the counter electrode periodically rather than continuously. The control unit establishes electrical connection during reactivation phases to rebuild electrostatic charge, then disconnects during normal operation to prevent voltage damage. This periodic connection approach maintains filtration effectiveness while eliminating continuous voltage exposure risks.
Solution Approach 2:
The system automatically detects when the filter's electrostatic charge needs reactivation and initiates electrical connection without external intervention. The control unit monitors filter status and autonomously manages the charging process, then disconnects when charging is complete, eliminating the need for manual voltage management while protecting against over-voltage damage.
2Duration of action of stationary object
If the filter is electrically connected to the counter electrode for reactivation, then the service life of the filter is extended, but the complexity of the electrical control system increases
Solution Approach 1:
The control unit automatically monitors the filter's electrostatic charge status and initiates electrical connection to the counter electrode only when reactivation is needed. The system self-manages the entire process including connection timing, charge transfer, and disconnection, eliminating the need for complex manual control mechanisms while extending filter service life through periodic reactivation.
Solution Approach 2:
The system recovers the filter's electrostatic charge by temporarily reconnecting it to the counter electrode when the charge diminishes during operation. This recovery process extends the filter's service life by restoring its filtering capability, and the automated control ensures this recovery happens only when necessary, avoiding unnecessary system complexity.
3Productivity
If a larger filter is used to filter highly polluted air, then the filtration capacity is improved, but the installation space requirement increases
Solution Approach 1:
The system enhances the filter's performance by dynamically changing its electrostatic charge parameter through periodic reactivation. By restoring and maintaining the electrostatic charge field, the filter achieves higher filtration capacity for particulates without increasing its physical dimensions, allowing effective filtration of highly polluted air within the same installation space.
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
This approach results in a durable and improved filtering effect with a simplified and reliable operation, extending the service life of the filter while maintaining effective particulate removal from the air.
Implementation Method 1
an electrode assembly (4) through which the flow path (P) passes upstream of the filter (2), wherein the electrode assembly (4) contains an electrode (5) that has at least one emitter (7) and a counter electrode (6), between which there is a voltage for generating a corona discharge in the air
Implementation Method 2
The object of the present invention is to create a better, or at least a different, embodiment of such an air filter... which has a long service life in particular... The present invention is based on the idea of generating an electrostatic charge in the filter
Data Source
AI summary
A filtering system for air is provided, which contains a filter and an electrode assembly upstream of the filter, which has an electrode and a counter electrode in an ionizer, between which there is a voltage for generating a corona discharge when in operation. A better and longer filtering effect, as well as a simplified implementation is obtained in that the counter electrode is connected to the filter by an electric line, in which a Z-diode is placed. An air conditioner and a vehicle that has such a filtering system is provided.