Fluid-Tight Fitting with Visual Tightness Indication
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Solution Overview
Problem
Conventional fluid-tight fittings are prone to loosening due to movement, vibration, or dynamic forces, making it difficult to ascertain whether a secure connection is maintained.
Innovation Solution
A nut assembly with a visual indicator that changes visibility to indicate a fully tightened condition, or the use of strain gauges and pressure monitoring to verify the sealing integrity of the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional threaded connection is used to join conduits, then the connection can be assembled and provides fluid-tight sealing, but the connection may loosen during use due to movement, vibration, or dynamic forces
Solution Approach 1:
The patent applies preliminary action by providing a locking mechanism that is pre-configured to prevent loosening before dynamic forces act on the connection. The locking feature is designed in advance to engage with the threaded portion and maintain constant engagement, counteracting vibration and movement effects before they can cause loosening.
2Reliability
If a locking mechanism is added to prevent loosening, then connection stability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the locking function with the existing nut and threaded portion structure. The locking feature is integrated into the nut body rather than being a separate component, combining the fastening and locking functions into a single element. This reduces overall device complexity while maintaining the anti-loosening capability.
3Ease of operation
If visual indicators are added to show tightening status, then ease of inspection is improved, but the device complexity increases
Solution Approach 1:
The patent uses color changes or visual indicators that change appearance based on the tightening status. The indicator may change color, become visible, or display different patterns when properly tightened versus when loose, providing immediate visual feedback without requiring complex inspection equipment or procedures.
Solution Approach 2:
The visual indicator system is self-service in that it automatically displays the tightening status without requiring external measurement tools or complex inspection procedures. The indicator is inherently linked to the mechanical state of the connection, providing self-diagnostic capability that simplifies inspection while adding minimal structural complexity.
Data Source
AI summary
A fluid-tight fitting includes at least one strain gauge or includes at least one passage, said passage extending radially through a nut and communicating with an interior chamber defined by a first conduit, a second conduit, and the nut, or includes a visual indicator associated with at least one of a nut or a first conduit of the fitting.