Kitchen hood filter
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Solution Overview
Problem
Existing kitchen hood filters do not provide a sufficient degree of filtration for solid and liquid particles containing grease, leading to unfiltered air remaining in the room, which is a critical issue for hygiene and fire safety in professional kitchens.
Innovation Solution
A kitchen hood filter with a series of longitudinal chambers and a meandering air flow, featuring angled intake and outlet slotted ducts and a T-bar design, which enhances airflow and particle separation, combining centrifugal force with labyrinthine elements for improved filtration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional filters with straight or simple labyrinthine paths are used, then the device complexity is low, but the filtration efficiency is insufficient
Solution Approach 1:
The filter is divided into multiple longitudinal chambers (at least three) with alternating airflow directions. Each chamber contains angled slotted ducts that segment the airflow path, creating a complex meandering pattern that increases filtration efficiency while maintaining modular structural simplicity
Solution Approach 2:
The filter transitions from simple planar labyrinthine paths to a three-dimensional meandering flow path through angled slotted ducts. The ducts are inclined at specific angles (30-60 degrees) relative to the chamber longitudinal axis, creating vertical and horizontal flow components that increase particle separation efficiency
2Productivity
If the airflow rate is increased to improve productivity, then the processing capacity increases, but the filtration efficiency decreases
Solution Approach 1:
The angled slotted ducts pre-condition the airflow by creating controlled turbulence and extending the flow path length before air exits the filter. This preliminary action ensures particles are separated throughout the entire airflow path, maintaining efficiency even at higher flow rates
Solution Approach 2:
The meandering flow path through multiple chambers ensures continuous particle separation throughout the entire airflow journey. The alternating chamber design maintains constant filtration action across all chambers simultaneously, preventing efficiency loss at elevated airflow rates
3Manufacturing precision
If mesh filters are used to capture grease particles, then the filtration efficiency improves, but the fire safety risk increases
Solution Approach 1:
The design extracts and removes grease particles from the airflow through centrifugal separation and impaction on chamber walls, preventing grease accumulation on filter surfaces. The meandering path and angled ducts promote grease deposition in easily accessible areas for cleaning, eliminating the fire hazard associated with grease-saturated mesh filters
Solution Approach 2:
The design converts the potentially harmful grease particles into a beneficial byproduct that deposits on chamber walls and duct surfaces where it can be easily removed. The centrifugal forces and flow patterns transform grease from a fire hazard into a collectible substance that can be cleaned during routine maintenance
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 filter achieves a high filtration efficiency of over 95% for particles up to 10 µm, significantly reducing grease particles in the air, improving hygiene and fire safety, and preventing fire penetration into ventilation systems.
Implementation Method 1
combining centrifugal force with labyrinthine elements for improved filtration efficiency
Implementation Method 2
The blade is a longitudinal slat which is angled at an intake opening of the slotted intake channel, thereby expanding the said opening
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The subject-matter of the invention is a kitchen hood filter designed to evacuate and purify air and to filter solid and liquid particles from air. A kitchen hood filter, with a series of longitudinal chambers with a quadrilateral profile, and with a meandering air flow, with mounted handles (8) facing in opposite directions, wherein each chamber has an intake slotted duct (4) formed between the side wall (2') of the profile and the side surface of the arm (9) of the profile parallel to it, wherein the arm (9) of the profile is a longitudinal slat angled at the intake opening (7) of the intake slotted duct (4), thereby expanding said opening (7), and wherein in each chamber, opposite to the intake slotted duct (4), an outlet slotted duct (1) is formed between the side wall (2) of the profile and the side surface of the arm (3) of the profile parallel to it, characterized in that the arm (3) of the profile is a slanted T-bar, inclined towards the outlet opening (6) of the slotted duct (1) and towards an angled offset slat (5) located in the side wall (2).