Rotating Perforated Plate Filtration for Grease Removal
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Solution Overview
Problem
Existing air filtering systems, particularly those with rotary filters, face manufacturing complexity and cost issues due to their multi-part structure, which can lead to limited strength and short working life, and are inefficient in removing small particles with low energy consumption.
Innovation Solution
An air filtering arrangement using a disc-like filter element made of a perforated metal plate, which is easy to manufacture, maintain, and clean, with a rotating design that utilizes centrifugal forces and tangential air flow to efficiently remove impurities from air conditioning systems, especially grease droplets in kitchen ventilation systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-part filter disc structure (support frame and netting) is used, then filtering function is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the support frame and filtering netting into a single integrated filter disc component. The filtering netting is permanently attached to the support frame as one piece, eliminating the need for separate assembly operations and reducing manufacturing complexity while maintaining the filtering function.
Solution Approach 2:
The filter disc is designed as a modular component that can be easily removed and replaced as a single unit. This segmentation allows for simplified manufacturing and maintenance, where the entire filter disc assembly can be handled as one replaceable part rather than multiple components.
2Reliability
If a multi-part filter disc structure is used, then filtering function is achieved, but strength and working life are limited
Solution Approach 1:
By integrating the support frame and netting into a single monolithic structure, the patent eliminates weak points at connection interfaces where detachment could occur. The unified structure distributes centrifugal forces more evenly throughout the component, enhancing overall strength and durability during rotation.
3Reliability
If a complex filter disc structure is used, then filtering function is achieved, but manufacturing cost increases
Solution Approach 1:
The integrated design reduces the number of parts that need to be manufactured, stored, and assembled. This consolidation simplifies the supply chain and manufacturing processes, leading to lower production costs while maintaining effective filtering functionality.
Solution Approach 2:
The filter disc is designed as an affordable, easily replaceable component with a simplified structure that reduces manufacturing costs. The design accepts that the filter will have a limited service life and can be economically replaced rather than repaired, reducing overall system cost.
4Productivity
If the filter disc rotates at high speed, then centrifugal cleaning effect is improved, but energy consumption increases
Solution Approach 1:
The patent optimizes the rotation speed parameter to achieve the minimum effective speed required for centrifugal separation. By carefully selecting and controlling the rotational velocity, the system achieves adequate cleaning efficiency while minimizing energy consumption, avoiding unnecessarily high speeds that would waste energy.
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 solution provides effective air filtration with low energy consumption, easy maintenance, and high efficiency in removing grease particles, as the perforated plate design prevents bypass flow and ensures efficient particle collection, enhancing the overall filtering capacity and reducing operational costs.
Implementation Method 1
the filter element is realized of a perforated plate... the perforated plate is arranged to rotate at such a speed of rotation that the tangential air flow in the perforated plate is so high that by means thereof, a bypass flow of the exhaust air through the gap left in between the perforated plate and the outlet aperture is prevented
Implementation Method 2
the perforated plate is arranged to rotate at such a speed of rotation that the tangential air flow in the perforated plate is so high that by means thereof, a bypass flow of the exhaust air through the gap left in between the perforated plate and the outlet aperture is prevented
Data Source
Figure 1~2
Figure 3
Figure 4a~4b
AI summary
The invention relates to an air filter for an air conditioning system. The air filter (1) comprises a disc-like filter element (2) and a power unit (3), preferably an electric motor, that is connected to the filter element for rotating it. Said filter element is arranged in connection with a ventilation duct (4; 42). According to the invention, the filter element (2) is realized of a perforated plate (20). In a preferred embodiment of the invention, the perforated plate (20) is a straight plate (21) with a uniform thickness, circular in perimeter (22), and provided with holes (23). The invention also relates to an air filtering arrangement that comprises an air filter according to the invention. According to the invention, the perforated plate (20) serving as the filter element (2) is arranged outside the aperture (4a) of the ventilation duct (4; 42), at a distance (s) therefrom.