Electrostatic Filtration Assembly with Conducting Filaments
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Solution Overview
Problem
Existing filtration assemblies are ineffective in removing ultra-fine particulate matter, require frequent maintenance, and can reintroduce pollutants due to accumulation and blockage issues, especially with finer particles less than 0.3 μm, which pose significant health hazards.
Innovation Solution
A filtration assembly with a perforated conducting grille at a negative electrical potential emits electrons to charge pollutant particles, which are then collected by a positive accumulation plate, aided by deflection elements and conducting filaments to enhance electron emission and particle collection, ensuring high filtration efficiency and reduced maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perforated grille with negative electrical potential is used to emit electrons for charging pollutant particles, then particles can be attracted to the collecting plate, but the filtration effectiveness against ultra-fine particulate (less than 0.3 μm) remains insufficient
Solution Approach 1:
The invention divides the electron emission function into multiple conducting filaments positioned at different locations within the duct, each filament independently emitting electrons to charge particles in its vicinity. This segmentation increases the total electron emission capacity and ensures comprehensive coverage of ultra-fine particulate matter throughout the airflow path.
Solution Approach 2:
The invention adds a spatial dimension to the filtration process by positioning conducting filaments at multiple locations (upstream, downstream, and at different heights) within the duct cross-section. This multi-dimensional arrangement ensures that electrons are emitted from various positions to effectively charge ultra-fine particles regardless of their location in the airflow, significantly improving filtration effectiveness against these hazardous particles.
2Reliability
If fabric partitions are used to retain polluting particles, then filtration is achieved, but the pores become progressively blocked requiring frequent maintenance
Solution Approach 1:
The invention replaces the mechanical filtration system (fabric partitions that physically block particles) with an electrical field-based system. Conducting filaments emit electrons that charge pollutant particles, which are then attracted to and collected on a positively charged plate. This substitution eliminates the pore blockage problem inherent in mechanical filters, as the electrical field continuously captures particles without physical obstruction.
Solution Approach 2:
The invention changes the fundamental operating parameter from mechanical blockage to electrical charge. Instead of relying on physical pore size to trap particles, the system uses electrical potential difference to charge and collect particles. This parameter change transforms the filtration mechanism from a passive mechanical barrier to an active electrical field system that maintains constant efficiency without pore clogging.
3Reliability
If pollutants accumulate on the partition surface, then filtration occurs, but the accumulated pollutants can be reintroduced into the enclosed space when the ventilation system restarts
Solution Approach 1:
The invention replaces the mechanical accumulation mechanism (pollutants trapped on fabric surfaces) with an electrical collection mechanism. The positively charged collecting plate continuously attracts and holds charged pollutant particles through electrostatic forces. This electrical collection method prevents the accumulation and subsequent reintroduction of pollutants that occurs with mechanical filters, as the electrical field maintains continuous particle capture capability.
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 assembly effectively captures ultra-fine particulate matter down to nanometer sizes, reduces maintenance frequency, and prevents pollutant reintroduction, maintaining high filtration effectiveness without mechanical pore blockage or resistance, ensuring safe and reliable air filtration.
Implementation Method 1
a perforated conducting grille, which is kept at a negative electrical potential, for the emission into said duct of electrons which can bond to the pollutant particles
Implementation Method 2
consequently giving them a negative electrical charge
Implementation Method 3
at least one accumulation plate, kept at a positive electrical voltage, for collecting the pollutant particles charged electrically negatively by the electrons emitted by said grille
Implementation Method 4
at least one deflection element being arranged proximate to said accumulation plate and being kept at a negative electrical potential in order to generate an electrical field inside said duct, with consequent redirection of the negatively electrically charged particles toward said accumulation plate
Implementation Method 5
at least one conducting filament, which faces and is proximate to a respective hole of said grille, said filament being kept at a negative electrical potential, for the emission of electrons, which can bond to the pollutant particles carried at least by the portion of fluid that passes through said respective hole
Data Source
AI summary
A filtration assembly (1), which comprises an enclosure (2) which defines inside it a duct (3) for the passage of a fluid which carries pollutant particles (A) to be removed. At a first transverse cross-section of the duct (3) at least one perforated conducting grille (4) is provided, which is kept at a negative electrical potential, so as to emit into the duct (3) electrons which can bond to the pollutant particles (A), consequently giving them a negative electrical charge. Inside the duct (3), downstream of the grille (4), at least one accumulation plate (5) is provided, kept at a positive electrical voltage, for collecting the pollutant particles (A) charged electrically negatively by the electrons emitted by the grille (4). Moreover, at least one deflection element (6) is arranged proximate to the accumulation plate (5) and is kept at a negative electrical potential in order to generate an electrical field inside the duct (3), with consequent redirection of the negatively electrically charged particles (A) toward the accumulation plate (5). The assembly comprises at least one conducting filament (7), which faces and is proximate to a respective hole (8) of the grille (4). The filament (7) is kept at a negative electrical potential, for the emission of electrons, which can bond to the pollutant particles (A) carried at least by the portion of fluid that passes through the respective hole (8).