Modular Electrostatic Filter Unit for Easy Extractor Hood Cleaning
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Solution Overview
Problem
Existing extractor hood filter units are complex and difficult to remove for cleaning, limiting their ease of handling and maintenance.
Innovation Solution
A modular electrostatic filter unit with a common housing for ionization and separation stages, featuring a non-conductive housing with externally accessible electrical contacts, allowing for easy insertion and removal from the extractor hood, and a design that includes a protective grid and drainage channel for improved stability and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic filter unit with plate-shaped separation and counter electrodes connected via electrically conductive webs is used, then filtration performance is improved, but device complexity increases and the filter unit cannot be removed for cleaning
Solution Approach 1:
The filter unit is divided into modular components: a housing containing the electrode assembly, a removable filter element with parallel plates, and a connection mechanism. This segmentation allows the filter element to be detached for cleaning while maintaining the complex electrode structure inside the housing, resolving the contradiction between filtration performance and cleanability.
Solution Approach 2:
The electrically conductive webs and electrode connections are extracted from the removable filter element and placed inside the permanent housing. This extraction allows the filter element to be simplified to just the parallel plate structure that can be easily removed and cleaned, while the complex electrical connections remain protected in the housing.
2Ease of operation
If a modular electrostatic filter unit with common housing for ionization and separation stages is used, then ease of handling and cleaning is improved, but device complexity increases
Solution Approach 1:
The ionization element and separation electrodes are combined into a single integrated filter unit with a common housing. This merging allows the entire assembly to be handled as one module that can be easily inserted and removed, improving ease of operation while the internal integration manages the complexity.
Solution Approach 2:
The common housing serves multiple functions: it contains both the ionization element and separation electrodes, provides electrical insulation, offers structural support, and enables the removable design. This multi-functionality consolidates several components into one, improving handling while managing complexity through functional integration.
3Reliability
If electrostatically charged particles are separated using plate-shaped electrodes arranged alternately, then filtration efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The parallel plate electrodes are designed with uniform spacing and alternating polarity only in the separation region, while the housing and connection areas have different structural properties. This local quality approach allows the complex alternating electrode arrangement to be implemented only where needed for filtration, simplifying manufacturing in other areas.
Solution Approach 2:
The electrode design uses standardized parameters for plate spacing, dimensions, and polarity alternation that can be consistently manufactured. By defining specific parameter ranges for the parallel plate structure, the filtration efficiency is maintained while manufacturing becomes more predictable and easier to control.
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 modular filter unit enables simple handling and reliable cleaning of vapors and contaminated air, with high filter performance even at low air flow speeds, effectively protecting downstream odor filters and extending their service life.
Implementation Method 1
As contaminated air flows through the ionization stage, solid and liquid substances are electrostatically charged by the ionization element
Implementation Method 2
the separation stage is arranged downstream of the ionization stage in the flow direction of the filter unit. The ionization element is subjected to voltage, preferably high voltage. As contaminated air flows through the ionization stage, solid and liquid substances are electrostatically charged by the ionization element
Data Source
Figure 1~2
Figure 3~5b
Figure 6~7
AI summary
The invention relates to a filter unit for an extractor hood (1), comprising an ionization unit (22) and a separation unit (21). The filter unit (2) is characterized in that the separation unit (21) is mounted downstream of the ionization unit (22) in the direction of flow, and in that the ionization unit (22) and the separation unit (21) are accommodated in a common housing (20), on at least one wall of which an electric contact element (25, 26) is arranged that is accessible from the outside. Also described in an extractor hood comprising at least one filter unit (2).