Extractor Hood V-Shaped Settling Units for Fat Droplet Separation
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Solution Overview
Problem
Extractor hoods face challenges in achieving high separation efficiency of small fat droplets from exhaust air, leading to increased energy consumption and noise due to the need for powerful blowers and filters, which also result in incomplete odor removal and frequent charcoal filter replacement.
Innovation Solution
The design incorporates V-shaped depositing units with perforated plates that create turbulence, allowing small fat droplets to conglomerate into larger units, which can be easily separated, and capillary forces aid in deposition, reducing flow resistance and the need for additional filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a filter is used to remove small fat droplets from exhaust air, then separation efficiency is improved, but flow resistance increases enormously requiring a more powerful and larger blower
Solution Approach 1:
The patent replaces the traditional mechanical filter system with a turbulence-based separation system. V-shaped deflectors create turbulent flow that causes small fat droplets to conglomerate into larger units through inertial forces, which then separate naturally without requiring a filter. This substitution eliminates the enormous flow resistance associated with filters while maintaining high separation efficiency.
Solution Approach 2:
The patent changes the flow regime parameter from laminar to turbulent by introducing V-shaped deflectors. This parameter change transforms the separation mechanism: in turbulent flow, small droplets follow different trajectories and collide with each other or with the duct walls, enabling separation without filters. The turbulence intensity and flow patterns are carefully controlled to optimize droplet conglomeration and separation.
2Manufacturing precision
If a more powerful blower is used to overcome high flow resistance, then separation performance is improved, but noise levels and energy consumption increase
Solution Approach 1:
The patent replaces the powerful blower system with a passive turbulence-based separation system. Instead of using high mechanical power to force air through a filter, the system uses V-shaped deflectors to create turbulent flow patterns that naturally separate fat droplets. This eliminates the need for excessive blower power, thereby reducing noise levels and energy consumption while maintaining effective separation performance.
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 approach enhances fat separation efficiency, reduces energy consumption, and minimizes noise by leveraging turbulence and capillary forces to separate small fat droplets without increasing flow resistance, enabling effective odor removal and extending charcoal filter life.
Implementation Method 1
The V-shaped depositing units create turbulence, allowing small fat droplets to congregate into larger units
Implementation Method 2
capillary forces aid in deposition
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention is based on an extractor hood for extracting exhaust air and for separating solid and liquid particles from the exhaust air, with at least one exhaust air inlet (18), a fan (14) and at least one exhaust air outlet (17). According to the invention, a cleaning stage with settling units (7) is provided, with the settling units (7) being V-shaped and several settling units (7) being arranged in such a way that the exhaust air flow is divided into several partial flows and passed between the settling units (7).