Curved Filter Hood Layout for Quiet High-Flow Air Filtration
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Solution Overview
Problem
Current kitchen filtering hoods suffer from reduced filtration efficiency due to particulate deposits and noise issues caused by high-speed air flow, which accelerates air through filtering elements, reducing their ability to retain impurities and odors effectively.
Innovation Solution
The air expelled from the suction unit is directed along a curved portion with filtering elements arranged around it, allowing for filtration before being conveyed through a duct with perforated panels, reducing turbulence and increasing the time air spends in the filtering elements, thus enhancing filtration efficiency and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air is accelerated through channels to be expelled from the hood, then air flow rate increases, but turbulence noise increases and filtration efficiency decreases
Solution Approach 1:
The patent employs curved surfaces and rounded transitions throughout the air flow path, including curved deflectors, rounded duct transitions, and curved filter arrangements. These curved geometries eliminate sharp corners and abrupt direction changes that generate turbulence, allowing high air flow rates to be maintained while significantly reducing turbulence-induced noise.
Solution Approach 2:
The patent introduces intermediate flow control elements such as deflectors, flow straighteners, and transition sections between the suction area and exhaust outlets. These intermediary components gradually adjust and smooth the air flow, preventing direct high-speed turbulent flow while maintaining productivity by controlling the flow path through multiple gentle transitions rather than single abrupt changes.
2Productivity
If air is accelerated through channels to be expelled from the hood, then air flow rate increases, but filtration efficiency decreases
Solution Approach 1:
The curved filter arrangement follows the rounded contours of the suction area, with filters positioned at various angles along the curved path. This curved configuration allows air to pass through filters at reduced speeds with gradual direction changes, maintaining filtration efficiency while preserving high overall air flow rate through the streamlined geometry.
Solution Approach 2:
The filtering system is divided into multiple filter elements arranged in series along the curved path, with each filter handling a portion of the filtration task. This segmentation allows air to be filtered through multiple stages at lower velocities, ensuring high filtration efficiency while the overall system maintains high productivity through parallel flow paths and optimized geometry.
3Device complexity
If filtering elements are provided only on outlets downstream channels, then device complexity is reduced, but particulate deposits occur inside the hood
Solution Approach 1:
Filtering elements are positioned upstream within the suction area, before air enters the main hood chamber. This preliminary filtration captures particulates early in the flow path, preventing deposits from forming inside the hood while maintaining relatively simple device complexity by integrating filters directly into the suction assembly rather than requiring separate downstream filtration systems.
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 solution improves filtration efficiency by reducing particulate deposits and noise, allowing for more effective air purification with a uniform air flow and increased retention of impurities and odors.
Implementation Method 1
the fluid expelled from the suction unit through its lateral surface is directed towards said curved portion provided with concavity facing the lateral surface thereof
Implementation Method 2
filtering elements arranged around the lateral surface of the suction unit
Implementation Method 3
Such solution moreover allows, in proximity of the suction unit, a uniform air flow to be obtained processed by the hood, in terms of fluid dynamics characteristics, thus reducing turbulent speed conditions inside the hood and consequently its noise
Implementation Method 4
the reduction in air speed conditions inside the hood further results in improving the filtration efficiency, since it allows the time air takes to run through the filtering elements to be increased and consequently the filtration efficiency to be increased
Data Source
Figure 1
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Figure 4~5
AI summary
The present invention relates to a filtering hood (1) for kitchens and the like, comprising a box body (10) comprising a suction inlet (2), and a suction unit (20) for sucking a fluid from the suction inlet (2). The suction unit comprises a centrifugal fan adapted to suck the fluid from the suction inlet and to expel it through a lateral surface (220). The hood further comprises a filtering unit (30) for filtering the fluid expelled through the lateral surface (220) of the suction unit (20) and for retaining impurities of such expelled fluid. The filtering unit (30) is further arranged along a curved portion provided with concavity facing the lateral surface (220) of the suction unit (20). The curved portion comprises a duct (305) for conveying the fluid expelled through the lateral surface (220) of said suction unit (20) towards an outlet opening formed on the box body (10), wherein said duct comprises a first portion that comprises a side wall (301) and a second portion that comprises at least a perforated panel (31) to allow fluid to run through.