Curved Drainage Layer for Hydraulic Filter Permeability
Solution Overview
Problem
Existing filter materials for hydraulic systems face challenges in achieving high fluid permeability while maintaining mechanical strength and resistance to alternating pressure loads, as known support structures tend to compromise either fluid permeability or mechanical strength.
Innovation Solution
A drainage layer with a three-dimensional structure and curved line elements that form enlarged flow channels and reduce fold distances, providing increased structural strength and fluid flow guidance, while also stabilizing folds to resist alternating pressure loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard fabrics with plain weave are used for support layers, then mechanical strength is maintained, but fluid permeability is insufficient
Solution Approach 1:
The patent applies curved line elements instead of straight threads in the plain weave structure. The arcuate line elements create a three-dimensional undulating structure that increases flow channel volume and cross-sectional area, thereby improving fluid permeability while maintaining the interlaced support function for mechanical strength
Solution Approach 2:
The invention transitions from a two-dimensional planar weave to a three-dimensional structure by curving the line elements. The arcuate shapes create depth and volume in the flow channels, adding a vertical dimension to the fluid flow path and significantly enhancing permeability without compromising the horizontal support function
2Productivity
If larger mesh sizes or coarser grids are provided to achieve lower flow resistance, then fluid permeability is improved, but resistance to alternating pressure loads decreases
Solution Approach 1:
The curved line elements create expanded flow channels with larger effective cross-sectional area, reducing flow resistance and improving permeability. Simultaneously, the continuous curved structure distributes alternating pressure loads more evenly across the support layer, preventing localized stress concentrations that would occur with larger mesh sizes
3Productivity
If a three-dimensional structure-forming additional drainage layer is provided, then flow channels are enlarged and differential pressure is reduced, but device complexity increases
Solution Approach 1:
The patent combines the support layer and drainage layer functions into a single integrated structure. The arcuate line elements simultaneously provide mechanical support through their interlaced configuration and create enlarged flow channels through their curved geometry, eliminating the need for separate additional drainage layers and reducing overall device complexity
Data Source
Figure 1
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AI summary
The invention relates to a filter material for a fluid, in particular in the form of a hydraulic fluid, said filter material comprising a multi-layer filter medium (10) through which a fluid can flow and which has at least one filter layer (20), a drainage layer (32) which forms a three-dimensional structure being designed to enlarge the flow channels formed for the fluid to flow through. Said drainage layer cooperates with an adjacent drainage layer and/or consists of individual line elements (33) that form a mesh or grid structure, those line elements being arc-shaped or curved at least to some extent. The invention further relates to a drainage layer (32) as such and to a filter element based thereon.