Wound Filter Element With Undercut Contour
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Solution Overview
Problem
Conventional filter elements with positive, outwardly curved circumferential contours limit their application to cylindrical shapes and uniform cross-sectional areas, making them unsuitable for complexly shaped installation locations.
Innovation Solution
A filter element with a cross-sectional area having a circumferential contour that undercuts its envelope contour, featuring at least one inwardly curved section, is produced using a support core and a pressure-exerting member to ensure the filter material follows the desired contour during winding, allowing for non-cylindrical shapes and varied cross-sectional configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional filter elements with positive, outwardly curved circumferential contours are used, then manufacturing is simple and straightforward, but the application range is limited and cannot accommodate complex installation locations
Solution Approach 1:
The patent applies inversion by creating an undercut circumferential contour that departs from the conventional positive, outwardly curved shape. The circumferential contour is designed to undercut the envelope contour, creating negative or concave sections that enable complex shapes like banana-shaped or hyperbolic configurations, thereby expanding adaptability to complex installation locations.
Solution Approach 2:
The patent introduces dimensional complexity by allowing the circumferential contour to undercut the envelope contour in the radial direction. This creates three-dimensional complexity from what would traditionally be a two-dimensional surface, enabling varied cross-sectional areas and complex shapes while maintaining manufacturability through controlled winding processes.
2Manufacturing precision
If filter layers are wound around a support core without additional pressing, then the winding process is simple, but the filter layers follow the envelope contour rather than the desired undercut circumferential contour
Solution Approach 1:
The patent introduces a pressure-exerting member as an intermediary between the winding device and the filter layers. This member applies localized pressure to force the filter layers to conform to the undercut circumferential contour of the support core, ensuring manufacturing precision without requiring complete redesign of the winding system.
Solution Approach 2:
The pressure-exerting member applies pressure locally at specific sections where the undercut contour requires intervention, rather than uniformly across the entire filter element. This allows the filter layers to maintain their natural envelope contour following behavior in most areas while achieving precise undercut contour adherence only where needed.
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
This configuration broadens the application range of filter elements, enabling their use in complexly shaped locations and providing an inflow or compression chamber for media filtration, enhancing their versatility and functionality.
Implementation Method 1
a pressure-exerting member for pressing the filter material at least in sections against the support core during winding of the filter material around the support core
Data Source
AI summary
A filter element (1) wound from a plurality of filter layers in which the circumferential contour (5, 5′) of a cross-sectional area (4) of the filter element (1) has at least one circumferential contour section (5′) undercutting the envelope contour (6, 6′) of the cross-sectional filter element area (4).