Ratcheting Fluid Coupling for Low-Force Conductive Sealing
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Solution Overview
Problem
Fluid conveyance fittings and couplings in aerospace applications face challenges in achieving low conductivity without requiring significant installation force, while also needing to allow for adequate axial travel and providing a visual indication of connection status, often resulting in bulky, heavy, and difficult-to-assemble designs.
Innovation Solution
A fluid coupling design featuring a first member, a second member, a nut, and a sleeve with an inner ratchet profile that engages with the shoulder, allowing for hand-tightened connections with mechanical advantage through threading and out-of-roundness configurations, and visual indicators for connection status, reducing weight and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal-to-metal seals are used to achieve low conductivity requirements, then conductivity is improved, but installation force requirement increases
Solution Approach 1:
A soft seal member (O-ring or similar elastomeric seal) is introduced as an intermediary between the male and female fitting surfaces. This soft seal deforms under compression to create the metal-to-metal electrical contact path, allowing adequate conductivity without requiring the high installation forces that would be needed for direct metal-to-metal sealing. The soft seal acts as a mediator that converts compressive force into effective electrical contact.
2Length of moving object
If conventional fitting designs are used to ensure adequate axial travel, then axial travel is improved, but device size increases
Solution Approach 1:
The fitting design incorporates a dynamic sealing approach where the soft seal member deforms elastically during connection and maintains sealing pressure through its inherent elasticity. This allows the fitting to accommodate axial travel requirements through controlled deformation of the soft seal rather than requiring excessive axial length, thereby reducing overall device size while maintaining functional performance.
3Ease of operation
If visual indication of connection status is provided, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The soft seal member is colored differently from the metal fitting surfaces to provide visual indication of proper connection. When the fitting is correctly assembled, the colored soft seal is visible in a specific position, giving the operator immediate visual confirmation of proper installation. This uses color contrast rather than additional mechanical indicators, maintaining simplicity while improving ease of operation.
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 design enables efficient, lightweight, and easy-to-assemble fluid couplings that maintain conductivity throughout axial travel with reduced force requirements and provide clear visual assurance of connection, addressing the challenges of conventional fittings.
Implementation Method 1
hand-tightened connections with mechanical advantage through threading
Implementation Method 2
inner ratchet profile that may correspond to a ratchet profile of the shoulder
Data Source
AI summary
A coupling includes a male adapter and a female adapter, and may include a nut and a sleeve. In embodiments, the male adapter includes a male adapter inner diameter, and may include threads. A method of operating a fluid coupling may include providing a first member, a second member, a nut, and a sleeve, connecting the sleeve with the nut such that rotation of the sleeve causes rotation of the nut, rotating the sleeve to connect the first member with the second member, engaging an inner ratchet profile of the sleeve with a ratchet profile of a shoulder of the first member, and covering the shoulder of the first member, including the ratchet profile, with the sleeve.