Filter unit for an extractor hood, and extractor hood
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Solution Overview
Problem
Existing extractor hood filter units have complex constructions that make them difficult to remove and clean, limiting their effectiveness in filtering fumes and steam.
Innovation Solution
A portable electrostatic filter unit with a common housing for the ionization and separation units, featuring accessible external electric contact elements, allowing for easy installation and removal, and a design with a protective grille for stability and airflow, along with a drainage channel for extended service time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic filter unit with plate-shaped separator and counter electrodes connected via electrically conductive webs is used, then filtering performance is improved, but device complexity increases and the filter unit cannot be removed
Solution Approach 1:
The filter unit is divided into modular components: a housing containing the electrostatic filter element, a drainage channel for collected contaminants, and external electric contact elements. This segmentation allows the entire filter unit to be removed as one module while maintaining the complex internal electrode structure for effective filtering.
Solution Approach 2:
The electrically conductive webs connecting the electrodes are extracted and replaced by external electric contact elements that penetrate the housing. This allows the filter element to be electrically connected without requiring complex internal wiring, enabling easy removal and installation of the entire filter unit.
2Reliability
If a complex electrostatic filter unit with internal wiring is used, then filtering performance is improved, but ease of operation deteriorates due to inability to remove
Solution Approach 1:
The electric connections are extracted from the internal structure and brought to the exterior through contact elements penetrating the housing. This allows the filter element to be electrically connected while maintaining complete removability as a single module, improving ease of operation without sacrificing filtering performance.
Solution Approach 2:
The filter unit is designed as a self-contained module with integrated housing, drainage channel, and electric contacts, allowing users to easily remove, clean, and reinstall the entire unit without requiring disassembly or complex electrical connections.
3Ease of operation
If a common housing for ionization and separation units with external electric contact elements is used, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The ionization unit and separation unit are merged into a single common housing with integrated electric contact elements. This combining simplifies handling by creating one removable module while the internal structure maintains the necessary complexity for effective electrostatic filtering through coordinated ionization and separation stages.
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 solution enables simple handling and reliable cleaning of fumes and steam, with high filtering performance and extended service intervals, while maintaining air quality and reducing pressure loss.
Implementation Method 1
The ionization element is subjected to voltage, preferably high voltage. When contaminated air flows through the ionization stage, solid and liquid substances are electrostatically charged by means of the ionization element
Implementation Method 2
The separation stage preferably comprises at least one collection electrode and at least one counter electrode which are designed to be plate-shaped and arranged alternately in the separation stage
Data Source
AI summary
A filter unit for an extractor hood includes a housing and an electric contact element arranged on a wall of the housing such as to be accessible from outside. Accommodated in the housing are an ionization unit and a separation unit which is mounted in the housing downstream of the ionization unit in a direction of flow.