Elastic Shielded Protective Hose for Connector Expansion
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Solution Overview
Problem
Existing protective hoses with electromagnetic shielding properties suffer from reduced shielding capacity when expanded, particularly in lengths adjacent to connectors, due to the inability to maintain reliable contact between conductive threads during expansion.
Innovation Solution
A protective hose with a braided or knitted design, utilizing elastically stretchable materials like silicone or polyurethane, ensures that conductive fibers remain in contact, maintaining effective electromagnetic shielding even in expanded states through a scissor effect or tensioned stitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the protective hose is expanded to pass over connectors, then the ease of installation is improved, but the shielding capacity against electromagnetic interference deteriorates
Solution Approach 1:
The protective hose utilizes a dynamic braided structure where threads can dynamically adjust their contact points during expansion and contraction. The braided configuration allows threads to maintain continuous contact through geometric rearrangement rather than relying on material elasticity alone, enabling the hose to expand for installation while preserving shielding integrity.
Solution Approach 2:
The protective hose employs a composite structure combining conductive threads (for electromagnetic shielding) with elastic material (for expandability). This composite design integrates the shielding function and mechanical flexibility function into a single unified structure, allowing both properties to work together rather than conflict with each other.
2Stability of the object's composition
If plastic threads are added to ensure elastic recovery, then the resilience is improved, but the shielding capacity in expanded state deteriorates
Solution Approach 1:
The invention extracts the elastic recovery function from the shielding function by using a braided structure where the geometric arrangement of threads provides the recovery mechanism. This separates the mechanical function (elasticity) from the electrical function (shielding), allowing conductive threads to maintain contact for shielding while the braided geometry provides elastic recovery, eliminating the need for non-conductive plastic threads that would disrupt the shielding continuity.
3Ease of operation
If the protective hose remains expanded adjacent to connectors, then the ease of installation is improved, but the shielding capacity deteriorates
Solution Approach 1:
The braided structure creates a dynamic system where thread contact points automatically adjust based on the expansion state. When expanded over a connector, the threads dynamically rearrange to maintain contact pathways, ensuring continuous shielding performance regardless of whether the hose is in an expanded or contracted state at any given location.
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
The use of elastically stretchable materials in the protective hose ensures consistent electromagnetic shielding performance across both unexpanded and expanded states, particularly in the frequency range of 10 kHz to 30 MHz, as demonstrated by EMC tests.
Implementation Method 1
The sheathing made of the elastically stretchable material ensures that the threads from which the protective tube is made remain reliably in contact with one another at the points where they touch each other during expansion
Implementation Method 2
the eddy currents induced by the electromagnetic interference effects can circulate essentially unhindered
Implementation Method 3
the eddy currents induced by the electromagnetic interference effects can circulate essentially unhindered, regardless of the expanded state of the protective tube, and thus can exert their shielding effect essentially unhindered
Data Source
Figure 1~5
Figure 2
Figure 3~4
AI summary
The invention relates to a protective hose (20) with electromagnetic shielding that can be elastically expanded in diameter and is manufactured using threads (22, 24) that are at least partially made of electrically conductive material. According to the invention, the protective hose (20) is sheathed with a layer (28) of an elastically expandable material.