Electrically Isolated Tube Coupling for ESD-Safe Fluid Connections
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Solution Overview
Problem
Existing connections for electrically conductive tubular components fail to effectively isolate against electrostatic charge transfer and electrical current flow, which is crucial in fluid transport systems, particularly in aerospace applications where electrostatic discharge and electromagnetic events can occur.
Innovation Solution
The solution involves using a combination of electrically conductive tubes, electrical isolators with central passageways, and a nut with internal threads that engage external threads on a flared end of one tube, along with annular sealing components to ensure electrical isolation and secure connection, preventing electrostatic discharge and current flow between the tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically conductive tubular components are connected directly, then electrical continuity is maintained, but electrostatic charge transfer and electrical current flow occur between components
Solution Approach 1:
The connection assembly is segmented into distinct functional components: a first conductive tube, a second conductive tube, and at least one electrical isolator positioned between them. This segmentation allows each component to perform its specific function - the tubes provide fluid transport while the isolator provides electrical isolation - thereby achieving reliable electrical isolation without requiring a completely redesign of the connection structure.
Solution Approach 2:
An electrical isolator serves as an intermediary component positioned between the first and second electrically conductive tubes. This isolator prevents electrostatic charge transfer and electrical current flow between the tubes while still allowing the tubes to be mechanically connected for fluid transport. The isolator mediates the interaction between the two conductive components, enabling both connection and isolation functions.
2Object-affected harmful factors
If electrical isolators are added between conductive tubes, then electrostatic discharge protection is achieved, but the connection assembly becomes more complex
Solution Approach 1:
The electrical isolator is designed to perform multiple functions simultaneously: it provides electrical isolation to prevent electrostatic discharge and current flow, while also serving as a structural element that facilitates the mechanical connection between tubes. The isolator may include features such as external threads for engagement with a nut and sealing surfaces for fluid-tight connections, thereby reducing the need for separate isolation and connection components.
Solution Approach 2:
The electrical isolator is merged with the connection mechanism by integrating threading features and sealing surfaces directly onto the isolator body. This allows the isolator to be installed as a single component that simultaneously provides electrical isolation, mechanical support, and fluid sealing, thereby minimizing the increase in assembly complexity while achieving comprehensive protection against electrostatic discharge.
3Strength
If a nut and thread engagement system is used to secure the connection, then a secure mechanical connection is achieved, but the assembly process requires precise threading alignment
Solution Approach 1:
The connection system is segmented into modular components with standardized threading: the first tube has external threads, the isolator has internal threads, and a nut provides additional external threads. This segmentation allows each component to be manufactured independently with precise threading, and the standardized thread patterns facilitate easy assembly without requiring complex alignment procedures, as threads naturally guide components into proper alignment during assembly.
Data Source
AI summary
An apparatus includes first and second electrically conductive tubes, first and second electrical isolators, and a nut. The first electrical isolator has a central passageway. The first electrically conductive tube has a flared end disposed around the first electrical isolator. The flared end includes external threads. The second electrically conductive tube has an outer flange. The second electrical isolator is disposed around the second electrically conductive tube and engages the outer flange. The nut is disposed around the second electrically conductive tube and engages the second electrical isolator. The nut includes internal threads corresponding to the external threads of the flared end of the first electrically conductive tube.