Honeycomb Filter Grid Apertures for Support and Filtrate Flow
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Solution Overview
Problem
Conventional filter grids in filter presses face challenges in achieving a balance between sufficient support for the filter element, mechanical strength, and filtrate flow, with smaller apertures providing better support but reducing flow capabilities, and larger apertures compromising structural integrity.
Innovation Solution
A filter grid design with a specific aperture ratio and layout, featuring hexagonal apertures with a ratio of aperture area to circumference above 1.3, occupying at least 35% of the total area, arranged in a honeycomb pattern, and protruding knobs for support, ensuring both robust mechanical strength and efficient filtrate flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If smaller aperture size is used in the filter grid, then better support for the filter element is achieved, but filtrate flow capability is reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the aperture size to a specific range (5-15mm) and controlling the aperture area ratio between 20-40%. This quantitative parameter optimization resolves the contradiction by finding the optimal balance point where apertures are small enough to provide support but large enough to maintain flow capability.
Solution Approach 2:
The patent implements local quality by creating different aperture sizes in different regions of the filter grid. The first region contains apertures of a first size while the second region contains apertures of a second size, allowing different areas to serve different functions - some areas prioritize support while others prioritize flow.
2Productivity
If larger aperture area is used in the filter grid, then filtrate flow capability is improved, but mechanical strength is compromised
Solution Approach 1:
The patent controls the aperture area ratio to remain between 20-40% of the total grid area, preventing any single aperture from becoming too large and compromising structural integrity while still maintaining sufficient flow capability through optimized aperture dimensions and distribution.
Solution Approach 2:
The patent divides the filter grid into multiple regions with different aperture characteristics. By segmenting the grid into a first region and second region with different aperture sizes, the overall structure maintains strength while specific segments provide enhanced flow capability.
3Strength
If perimeter to area ratio of apertures is increased, then better support is provided, but flow resistance increases
Solution Approach 1:
The patent optimizes the perimeter-to-area ratio parameter by selecting specific aperture size ranges and shapes. By controlling this geometric parameter, the patent achieves the optimal balance where apertures provide sufficient support through adequate perimeter while maintaining low flow resistance through controlled area.
Data Source
AI summary
A filter grid including a plate-like grid body having a first side and an opposing second side. The grid body further includes a plurality of apertures extending between the first side and the second side, thereby providing fluid communication between the first side and the second side through the grid body. Each of the plurality of apertures define an aperture area and an aperture circumference, such that a ratio of the aperture area in millimetres squared to the aperture circumference in millimetres is above 1.3, and the plurality of apertures occupy at least 35% of a total area of the first side. A filtrate vat assembly, a filter plate assembly and filter press are designed using the filter grid.