Filter Core Surface Features for Structural Strength
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Solution Overview
Problem
Conventional filter cores formed from perforated and expanded sheet metal are weak due to flow openings, compromising their structural integrity and requiring thicker materials for strength, which increases weight and cost.
Innovation Solution
A filter core with a tubular body featuring surface features that include a flow area portion and a bridging portion for strength, allowing for the use of thinner gauge metal sheets, enhancing rigidity and reducing material costs while maintaining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If flow openings are introduced in the filter core to enable fluid flow, then fluid flow capability is improved, but structural strength deteriorates
Solution Approach 1:
The filter core is segmented into multiple struts arranged in a pattern, with each strut containing flow openings. This segmentation allows the core to maintain structural integrity through the distributed strut network while providing sufficient flow paths through the openings in each strut, resolving the contradiction between flow capability and structural strength.
Solution Approach 2:
The strut configuration provides local reinforcement at critical locations where struts intersect or connect, while maintaining flow openings in non-critical areas. This local quality differentiation allows the filter core to have varying thickness and strength characteristics - thicker and stronger where needed for structural support, and thinner with flow openings where fluid passage is prioritized.
2Strength
If thicker material is used to maintain strength with flow openings, then structural strength is improved, but weight increases
Solution Approach 1:
The filter core uses a segmented strut architecture where multiple thinner struts work together to provide the necessary structural strength, eliminating the need for a single thick wall construction. This segmentation allows the use of thinner gauge material (e.g., 24 gauge or thinner) while maintaining overall structural integrity through the distributed strut network.
Solution Approach 2:
The filter core employs a composite structure combining metal struts with varying thicknesses - thicker sections at connection points and thinner sections in between - creating a composite-like behavior that achieves high strength-to-weight ratio without requiring uniformly thick material throughout the entire core structure.
3Strength
If thicker material is used to maintain strength with flow openings, then structural strength is improved, but manufacturing cost increases
Solution Approach 1:
The segmented strut design allows the filter core to be manufactured from thinner, less expensive metal sheets while achieving the required structural strength through the distributed strut architecture. This reduces material costs compared to using thicker sheets, and the segmented pattern is well-suited to standard fabrication processes like punching and forming.
Solution Approach 2:
The invention optimizes the strut dimensions, spacing, and thickness parameters to achieve the minimum necessary material usage for structural strength. By carefully selecting these parameters - such as strut thickness of 24 gauge or thinner, and optimizing the pattern density - the design reduces material consumption and manufacturing cost while maintaining adequate strength for the application.
Data Source
AI summary
A filter core includes a tubular body that has a first end and a second end. The tubular body includes a plurality of surface features spaced longitudinally along the tubular body between the first and second ends. Each of the surface features includes a first portion for flow area and a second portion for bridging across an opening for strength.