Extractor hood with filter element
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Solution Overview
Problem
Existing fume extraction devices face challenges in achieving balanced filter performance between grease and odor filter elements due to differing filter rates and pressure losses, leading to inefficient air purification and potential clogging.
Innovation Solution
The design features a rotor blade with an adjacent arrangement of a longer grease filter element at the leading edge and a shorter odor filter element at the trailing edge, allowing for adjustable filter rates by varying the pressure distribution across the blade, preventing contamination of the odor filter and optimizing air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter rate of the odor filter element is increased to improve air purification, then the filter performance improves, but the pressure loss increases and energy consumption rises
Solution Approach 1:
The patent applies different filter materials with different filter rates to different regions of the rotor blade. The grease filter element has a higher filter rate than the odor filter element, matching the local flow conditions and contamination levels at each blade region, thereby optimizing overall filter performance while minimizing pressure loss.
Solution Approach 2:
The patent varies the filter rate parameter across different filter elements and at different radial positions on the rotor blade. By adjusting the filter rate parameter to match local flow conditions, the system achieves effective air purification without excessive pressure loss and energy consumption.
2Device complexity
If a single filter element is used for both grease and odor filtration, then the device complexity is reduced, but the filter performance for both contaminants cannot be optimized
Solution Approach 1:
The patent divides the rotor blade into multiple segments with different filter elements. Each segment is equipped with a filter element suited for the local contamination conditions, allowing optimized filtration for both grease and odor contaminants while maintaining a compact integrated structure.
Solution Approach 2:
The patent uses composite filter materials with different filter rates on the same rotor blade. The grease filter element uses material with higher filter rate while the odor filter element uses material with lower filter rate, creating a composite filtration system that handles multiple contaminant types effectively.
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 configuration enhances the filter performance by ensuring effective separation of impurities, reducing energy consumption, and maintaining efficient air purification with improved filter rates and reduced clogging risks.
Implementation Method 1
The grease filter element has a certain obstruction through which the air is deflected several times. The heavy particles, in particular fat particles, hit the filter material and are separated there.
Implementation Method 2
The odor filter element preferably consists of a material on which odorous substances can be deposited or on which they can be bound. The vapor must hit the surface of the filter material, in particular the activated carbon, or flow along it.
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a fume extraction device which has a housing (2) and a rotor (4) arranged in the housing (2) and having at least one rotor blade (41) which is formed at least in regions by a filter element (30, 31), the Rotor blade (41) comprises at least one grease filter element (30) and at least one odor filter element (31), which lie adjacent to one another in the axial direction of the rotor blade (41).