Hollow Tubular Filter with 3D Flow Paths for Better Particle Capture
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Solution Overview
Problem
Conventional hollow cylindrical filters formed by winding metal wire rods in a spiral and multilayered manner are limited in their ability to remove foreign substances efficiently, as they primarily allow gas flow in the radial direction, restricting flow in the axial and peripheral directions due to their rectangular cross-sectional shape.
Innovation Solution
The filter is designed with a metal wire rod having an irregular cross-sectional shape, such as a W shape, formed by irregular rolling, which creates intersecting layers that form communication paths in the axial, radial, and peripheral directions, allowing fluid to pass through in multiple directions and increasing the contact area with the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal wire rod with a rectangular cross-sectional shape is used, then the filter structure is simple and easy to manufacture, but the gas flow is restricted to the radial direction only, reducing filtration efficiency
Solution Approach 1:
The patent applies asymmetry by changing the metal wire rod cross-section from a symmetric rectangular shape to an asymmetric irregular shape with protrusions and recesses. This asymmetric geometry creates uneven spacing between adjacent wire rods, forming three-dimensional communication paths that enable gas flow in axial, radial, and peripheral directions simultaneously, thereby improving filtration efficiency without complicating the manufacturing process
Solution Approach 2:
The patent implements dimensionality change by transitioning from a two-dimensional radial flow path to a three-dimensional flow path. The irregular cross-sectional shape with protrusions and recesses creates void spaces that connect communication paths in multiple directions (axial, radial, and peripheral), adding spatial dimensions to the gas flow trajectory and increasing the contact area between gas and filter medium
2Device complexity
If the gas flow path is limited to radial direction only, then the filter structure is simple, but the contact area between gas and filter is reduced, lowering filtration efficiency
Solution Approach 1:
The patent adds spatial dimensions to the gas flow path by creating three-dimensional communication paths through irregular wire rod cross-sections. The protrusions and recesses form void spaces that connect axial, radial, and peripheral directions, transforming the flow from a simple two-dimensional radial path to a complex three-dimensional path that increases gas-filter contact area and filtration efficiency
Solution Approach 2:
The patent segments the wire rod cross-section into multiple levels with protrusions and recesses, creating a stepped or wavy configuration. This segmentation divides the flow path into multiple segments that connect in series, forcing gas to traverse a longer, more complex path through the filter medium, thereby increasing contact area and filtration efficiency
3Ease of manufacture
If a regular circular cross-sectional shape is used, then the manufacturing process is simple, but the communication paths in multiple directions are not formed, reducing foreign substance removal efficiency
Solution Approach 1:
The patent applies asymmetry by deviating from the regular circular cross-section to an irregular shape with deliberate protrusions and recesses. This asymmetric geometry creates non-uniform spacing between adjacent wire rods, forming three-dimensional communication paths that enable multi-directional gas flow and improve foreign substance removal efficiency while maintaining manufacturing simplicity
Solution Approach 2:
The patent implements dimensionality change by transforming the wire rod cross-section from a two-dimensional circle to a three-dimensional irregular shape with protrusions and recesses. This creates void spaces that connect communication paths in axial, radial, and peripheral directions, enhancing foreign substance removal efficiency through increased gas-filter interaction
Data Source
Figure 1~2
Figure 3
Figure 4(a)~6
AI summary
A hollow cylindrical filter that can efficiently remove a foreign substance by forming complicated passages including an axial direction and a radial direction in the filter. A hollow cylindrical filter 10 formed by winding a metal wire rod 20 in a spiral and multilayered manner, the metal wire rod includes a recess formed throughout the entire length in a longitudinal direction, or recesses repeated along the longitudinal direction, the metal wire rods that configure wire rod layers extend in a direction inclined with respect to the axial direction of the hollow cylindrical filter, and the metal wire rods that configure the adjacent wire rod layers extend in directions intersecting with each other, thereby to form a plurality of communication paths that communicates with a direction into which the wire rod layers overlap with each other, and a space that allows the plurality of communication paths to communicates with each other is formed between the recess of the metal wire rod that configures one wire rod layer and the metal wire rod that configures another adjacent wire rod layer.