Tubular Electrostatic Air Filter With Porous Foam Electrode
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Solution Overview
Problem
Existing tube-like electrostatic air filters have a poor ability to hold large amounts of contaminants, leading to inefficient particle collection and cumbersome cleaning processes, especially in highly contaminated environments like industrial and fabrication areas.
Innovation Solution
The use of tubular collecting electrodes with a metal outer conductive layer and an inner open-cell foam layer, or flexible electrically conductive materials, and a honeycomb structure with oppositely charged electrodes, enhances contaminant collection capacity and facilitates easy replacement and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If tube-like collecting electrodes are used in electrostatic air filters, then the filter structure is simple and compact, but the ability to hold large amounts of contaminants is poor
Solution Approach 1:
The patent applies porous materials by using foam or fibrous material as the collecting electrode instead of solid tube-like structures. This porous structure provides vastly increased surface area within the same volume, enabling the filter to hold much larger amounts of contaminants. The porous nature also allows contaminants to be trapped within the material matrix, facilitating easier removal through replacement or cleaning of the foam/fibrous element.
Solution Approach 2:
The patent transitions from two-dimensional flat plate collecting electrodes to three-dimensional foam or fibrous structures. This dimensional change increases the collecting surface area by filling the space volumetrically rather than just planarly, allowing the filter to accommodate much larger contaminant loads without increasing the overall filter footprint significantly.
2Productivity
If tube-like collecting electrodes are used, then the device structure is compact, but the cleaning procedure becomes cumbersome and expensive
Solution Approach 1:
The patent applies the disposable principle by designing the foam or fibrous collecting electrode as a replaceable component. When the porous material becomes saturated with contaminants, it can be easily removed and replaced with a fresh element. This approach is more economical than attempting to clean complex tube-like structures, and the low cost of foam/fibrous materials makes replacement a practical maintenance strategy.
Solution Approach 2:
The patent segments the collecting electrode into a modular foam or fibrous element that can be independently removed and replaced. This segmentation separates the contaminant-trapping function from the structural housing, allowing maintenance personnel to simply swap out the porous element without disassembling the entire filter unit, thereby simplifying and cheapening the cleaning/maintenance procedure.
3Quantity of substance
If foam or fibrous material is used as collecting electrode, then contaminant collection capacity increases, but the electrical conductivity may be reduced
Solution Approach 1:
The patent applies composite materials by combining electrically conductive materials with foam or fibrous structures. This could involve coating the porous material with conductive layers, embedding conductive particles within the foam matrix, or using conductive foam materials. The composite structure maintains the high surface area and contaminant-trapping capability of porous materials while ensuring sufficient electrical conductivity for effective electrostatic particle collection.
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
These designs significantly increase the contaminant collection capacity, allow for easier maintenance, and enable the use of electrostatic air filters in hard-to-reach areas with improved air cleaning efficiency and reduced power consumption.
Implementation Method 1
When sufficient electrical potential difference on the order of kilovolts or tens of kilovolts is applied between those electrodes, the corona discharge takes place and ions are emitted from the corona electrodes
Implementation Method 2
When charged particles enter the area between the collecting and repelling electrodes, these particles are pushed toward the collecting electrodes by the electric force between those electrodes
Implementation Method 3
An inner part may be made of open cell foam. This foam may have several millimeters thickness and is capable of collecting a much greater amount of the contaminants than a flat metal surface due to the high collecting area
Data Source
AI summary
An electronic air filter containing a tubular collecting electrode and an ion emitting electrode located concentrically inside of the tube-like collecting electrode, the collecting electrode consists of outer electrically conductive shell and inner layer made of open cell porous material.