Drum Filter Panels with Lattice Support for Strength and Flexibility
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Solution Overview
Problem
Existing filter panels for drum filters face challenges in balancing strength and cost, with wire cloths being strong but expensive, and plastic cloths being fragile and difficult to tension properly, leading to rapid deterioration.
Innovation Solution
A filter panel design featuring a lattice of crosspieces connecting the frame edges, including inclined diagonals and parallel intermediate cross-members, made in one piece with the frame, ensuring rigidity and flexibility, and a plastic filter cloth welded to the frame for optimal tension and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wire cloths are used for filter panels, then strength is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies composite materials by combining a plastic frame with a plastic filter cloth and reinforcing lattice structure. This composite approach replaces expensive wire cloths with a plastic-based composite system that achieves comparable strength while reducing manufacturing costs, directly resolving the contradiction between strength and manufacturing cost.
2Ease of manufacture
If plastic filter cloths are used, then manufacturing cost is reduced, but reliability deteriorates due to fragility and difficulty in tensioning
Solution Approach 1:
The lattice structure is designed and positioned beforehand to provide pre-tensioning support for the filter cloth. This preliminary structural arrangement ensures that the plastic filter cloth is properly tensioned during installation, preventing the fragility and tensioning difficulties that would otherwise reduce reliability.
Solution Approach 2:
The patent changes the structural parameters by introducing a rigid lattice framework with specific geometric configurations (cross-members, diagonals, triangles). This parameter change transforms the soft, difficult-to-tension plastic cloth into a stable, reliably tensioned filtering surface, resolving the reliability issue while maintaining low manufacturing cost.
3Strength
If the filter cloth is made more rigid, then strength is improved, but flexibility deteriorates affecting installation on drum
Solution Approach 1:
The filter panel is segmented into a rigid lattice framework and a flexible filter cloth layer. This segmentation allows the lattice to provide structural strength while the filter cloth maintains flexibility for installation on the drum. The separation of functions resolves the contradiction between strength and flexibility.
Solution Approach 2:
The patent uses a thin, flexible filter cloth stretched over a rigid lattice framework. The thin film (filter cloth) provides flexibility for installation and conforming to the drum surface, while the underlying lattice provides the necessary structural strength, resolving the contradiction between rigidity and flexibility.
Data Source
AI summary
The present invention relates to a filter panel which is intended to be mounted in a drum filter, the filter panel comprising a peripheral frame to which a filter cloth is fixed, the frame being formed by two longitudinal members which are connected at each end by an end cross-member, characterized in that the filter panel comprises a lattice (R1) of crosspieces which connect the inner edges of the frame to one another, the lattice (R1) of crosspieces forming at least a first closed pattern (54) in the centre of the frame and comprising at least four diagonals which are inclined with respect to the longitudinal members and which extend from the first closed pattern to an inner edge of the frame.