Hollow Cylindrical Wire Filter End Fixation Without Sintering
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Solution Overview
Problem
Existing hollow cylindrical winding filters do not effectively address the fixation and anti-fray treatment of the end portion on the winding start side, particularly without heat treatment such as sintering.
Innovation Solution
A hollow cylindrical filter is produced by winding a metallic wire rod spirally and in a multilayered manner, where the start end portion of the wire rod is folded and placed between adjacent wire rod layers to ensure mechanical fixation and prevent fraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If heat treatment such as sintering is not performed on the entire winding filter, then manufacturing cost is reduced and manufacturing efficiency is improved, but the fixation and anti-fray treatment of the end portion on the winding start side becomes insufficient
Solution Approach 1:
The end portion of the metallic wire rod is folded back and placed between adjacent wire rod layers before the winding process is completed. This preliminary action secures the end portion in advance, preventing it from falling out or fraying during subsequent handling and use, without requiring heat treatment or other additional fixation processes.
Solution Approach 2:
The folded-back end portion of the metallic wire rod is nested between adjacent wire rod layers within the filter structure. This nesting approach utilizes the existing layered structure of the filter to contain and secure the end portion, eliminating the need for separate fixation mechanisms or heat treatment processes.
2Use of energy by moving object
If heat treatment such as sintering is not performed on the entire winding filter, then energy consumption is reduced, but the shape retaining property and sealing performance at the end portion deteriorates
Solution Approach 1:
The end portion is folded back and positioned between adjacent layers during the winding process itself, before the filter is completed and put into service. This preliminary securing action ensures the end portion maintains its position and contributes to shape stability without requiring additional energy-intensive heat treatment processes.
Solution Approach 2:
The folded-back end portion utilizes the mechanical structure of the adjacent wire rod layers to secure itself. The layers act as natural retainers, providing friction and physical constraint that maintain the end portion's position and contribute to the overall shape stability of the filter without external energy input or additional components.
3Device complexity
If the end portion on the winding start side is not treated, then manufacturing process is simplified, but fraying and falling out of the end portion occurs
Solution Approach 1:
The folding of the end portion is performed as part of the winding process itself, integrating the anti-fray treatment into the main manufacturing operation. This approach adds minimal complexity to the winding process while effectively preventing fraying and falling out, avoiding the need for separate treatment steps.
Solution Approach 2:
The folded end portion is nested within the layered structure of the filter, using the adjacent wire rod layers as natural containment. This nesting approach provides effective fraying prevention and mechanical retention without requiring additional components, coatings, or complex processing steps.
Data Source
AI summary
A hollow cylindrical filter includes an inner cylindrical body 31 including a first wire rod layer L1 located on the innermost circumference and being wound with two or more layers of the metallic wire rod, and an outer cylindrical body 32 located immediately on the outer circumferential side of the inner cylindrical body and wound with the metallic wire rod. After the inner cylindrical body is formed, a start end portion 20a of the metallic wire rod is folded to be positioned on an outer circumferential side of the inner cylindrical body, and is further wound with the metallic wire rod to form the outer cylindrical body, whereby the start end portion of the metallic wire rod is folded and placed between the inner cylindrical body and the outer cylindrical body.