Conductive Elastomeric Coupling for Flexible High-Temperature Ducts
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Solution Overview
Problem
High-temperature pneumatic duct systems require couplings that provide efficient static and dynamic sealing, flexibility, and electrical conductivity without fatigue or wear, while meeting specific electrical resistance requirements.
Innovation Solution
A conductive elastomeric flexible coupling with a reinforced-silicone compound and a conductive silicone coating, featuring convolutions for axial deflection and a conductive paint or ink that adheres to the coupling's surface, ensuring electrical conductivity and preventing reassembly issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive wire mesh is integrated into the coupling to achieve electrical conductivity, then the conductivity requirement is met, but the coupling requires large convolutions and increased device complexity
Solution Approach 1:
The conductive wire mesh is extracted and replaced with a conductive coating applied directly to the elastomeric coupling surface. This removes the need for integrated mesh structures and large convolutions, simplifying the coupling design while maintaining electrical conductivity through the coating layer alone
Solution Approach 2:
The mechanical conductive wire mesh structure is replaced with a chemical/conductive coating solution. Instead of relying on physical metal wires embedded in the elastomer, the invention uses a conductive coating material that provides electrical conductivity through its compositional properties, eliminating the need for complex mechanical integration
2Adaptability or versatility
If the coupling is made with reinforced-silicone compound and convolutions for flexibility, then thermal expansion and flexibility are accommodated, but manufacturing complexity increases
Solution Approach 1:
The invention changes the material parameter by using reinforced-silicone compound with inherent flexibility and thermal resistance properties. The convolutions are designed with optimized geometry that provides the required flexibility and thermal expansion accommodation while being manufacturable using standard molding techniques, balancing adaptability with ease of manufacture
3Reliability
If conductive paint or ink is applied to the coupling surface, then electrical bonding requirements are met and static charge is bled, but additional manufacturing steps are required
Solution Approach 1:
The conductive coating application is merged with the existing coupling manufacturing process. The coating is applied as part of the production sequence, potentially during or after molding, and cured in-line. This integration minimizes additional manufacturing steps and maintains productivity while achieving the required electrical bonding and static charge dissipation
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 coupling effectively bleeds static charge, maintains conductivity, and absorbs thermal expansion, offering reliable sealing and flexibility while meeting electrical bonding requirements at high temperatures, with simplified fabrication and reduced costs.
Implementation Method 1
The coating 28 acts as an electrically conductive compliant material configured to conduct electrical charges
Implementation Method 2
The coupling 10 may be composed of aramid or glass or ceramic fabric-reinforced silicone rubber or similar resilient material
Implementation Method 3
Thermal-resistance joints and couplings facilitate thermal expansions and mechanical motions in high-temperature pneumatic systems
Data Source
Figure 1~2
AI summary
A conductive elastomeric flexible coupling 10 for a pneumatic duct system is provided. The coupling includes a tube section 16. An electrically conductive coating 28 is applied to at least an exterior surface of the tube section 16. The coating 28 acts as an electrically conductive compliant material configured to conduct electrical charges transferred from a substance carried by and flowing through the duct system and accommodate large deflections.