Extractor Hood Odor Filter Channels for Low-Noise Air Cleaning
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Solution Overview
Problem
Existing filter elements in extractor hoods have a limited effective filter surface area, leading to increased noise due to high air resistance, making it difficult to achieve effective air cleaning of odorous substances within the available installation space.
Innovation Solution
The filter element features depressions on its entry side that extend at least half its height, increasing the filter surface area and reducing air resistance by forming air duct channels that align with the main flow direction, while maintaining a minimal thickness to prevent air turbulence and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the filter material mat height is increased to achieve adequate air cleaning, then the effective filter surface area is improved, but the air resistance increases resulting in higher noise development
Solution Approach 1:
The filter element introduces air ducts that extend in the height direction, creating a three-dimensional flow path structure. This transforms the traditional two-dimensional filter surface into a multi-dimensional system where air can flow through vertical channels, effectively increasing the filter surface area without proportionally increasing the horizontal footprint or air resistance.
Solution Approach 2:
The filter material mat is divided into multiple sections by the air ducts running through its height. This segmentation creates multiple independent flow paths, allowing air to be distributed across different regions of the filter material, thereby increasing the effective filter surface area while maintaining manageable air resistance levels in each segment.
2Area of stationary object
If multiple filter elements are provided to achieve adequate air cleaning, then the effective filter surface area is improved, but the installation space requirements increase
Solution Approach 1:
Multiple filter functions are merged into a single integrated filter element. The air ducts and filter material mat work together as one unit, combining what would traditionally require multiple separate filter elements into a single compact structure that provides equivalent or superior filtration capacity within the same installation space.
Solution Approach 2:
The filter element utilizes the height dimension by extending air ducts vertically through the filter material mat. This three-dimensional configuration allows the single filter element to provide the equivalent effective filter surface area of multiple planar filters without requiring multiple units, thereby saving installation space.
3Area of stationary object
If the filter material mat height is increased to achieve adequate air cleaning, then the effective filter surface area is improved, but the air resistance increases
Solution Approach 1:
The air ducts create vertical flow paths that extend through the height of the filter element, transforming the air flow from a two-dimensional planar path to a three-dimensional vertical path. This allows air to access larger portions of the filter material surface area without increasing the horizontal travel distance, thereby reducing air resistance while improving effective filter surface area.
Solution Approach 2:
The air ducts segment the filter material mat into multiple zones with dedicated flow paths. This segmentation prevents air from traveling across the entire horizontal expanse of the filter, reducing the effective air resistance while still engaging multiple regions of the filter material, thereby increasing the effective filter surface area utilized.
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 design enhances odor reduction with reduced air resistance and noise development, allowing for effective air cleaning without compromising air volume flow or increasing sound output.
Implementation Method 1
a filter material mat consisting of foam and charged with active carbon
Data Source
AI summary
A filter element for an extractor hood includes an odor filter having depressions provided in an entry side of the filter element and extending at least over half of a height of the filter element. A frame holds the odor filter at its edges and has a height which is smaller at least on one side of the frame than a height of the odor filter.