Quick Connect Coupling Verifier Tabs for Secure Fluid Connection
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Solution Overview
Problem
Existing quick connect couplings in the automotive industry often fail to ensure a secure fluid connection, as they can separate after extended use if the tube is only partially connected, posing risks, especially in fuel systems.
Innovation Solution
A quick connect coupling design featuring a verifier assembly with axially slidably mounted verifier tabs that provide a visual indication of full connection by flexing inwardly when the tube is fully inserted, ensuring proper engagement and preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tube is only partially connected to the housing, then the connection process is simple and quick, but the fluid connector and tube can separate after extended use
Solution Approach 1:
The verifier assembly provides visual feedback through verifier tabs that extend outwardly when the tube is not fully connected and retract when fully connected. This feedback mechanism ensures the operator can confirm proper connection, preventing partial connections that would lead to separation during use.
Solution Approach 2:
The retainer fingers are pre-positioned within the housing to engage the bead at the correct location. The bead must be fully inserted to allow the retainer fingers to properly engage and lock the tube in place, preventing separation before use begins.
2Reliability
If a retainer with resilient fingers is used to lock the tube, then the tube can be securely locked when fully connected, but there is no indication whether the tube is fully connected or not
Solution Approach 1:
The verifier tabs provide visual information about connection status through their position - extending outwardly indicates incomplete connection while retraction indicates full connection. This visual indicator system solves the information loss problem by making connection status immediately observable.
Solution Approach 2:
The verifier assembly provides real-time feedback about connection completeness. When the tube is fully inserted, the verifier tabs retract into the housing; when partially inserted, they remain extended, giving continuous information about connection status.
3Loss of information
If the verifier tabs are made flexible to allow movement, then they can provide visual indication of connection status, but they may not provide sufficient locking force
Solution Approach 1:
The system is divided into separate functional components: the retainer fingers provide the locking force to secure the tube, while the verifier tabs provide visual indication. This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The verifier assembly is integrated with the retainer assembly, combining the locking function and indication function into a single coordinated system. The verifier tabs move in response to tube insertion and work in conjunction with the retainer fingers to provide both security and information.
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 solution ensures a secure and reliable fluid connection by visually confirming full engagement of the tube, preventing accidental disconnection and reducing the risk of disastrous consequences in applications like fuel systems.
Implementation Method 1
a retainer, typically constructed of spring steel, is contained within the housing and frictionally engages the side of the tubing bead facing outwardly from the housing. Consequently, upon insertion of the tube into the housing, the bead flexes the retainer fingers radially outwardly to allow the bead to pass beyond the retainer fingers. Once the bead is fully positioned within the housing and the fluid coupling is in a fully connected position, the retainer fingers flex inwardly and engage the outwardly facing side of the bead thus locking the bead, and thus the tube, to the housing.
Implementation Method 2
A release sleeve is also slidably mounted to the housing so that the release sleeve surrounds the tube and also so that the release sleeve extends partially outwardly from the open end of the housing. This release sleeve is dimensioned so that, upon compression of the release sleeve into the housing, the release sleeve engages the resilient fingers of the retainer and flexes these resilient fingers outwardly.
Implementation Method 3
the verifier tabs are dimensioned so that the verifier tabs can extend around the outwardly extending side of the tube bead only when the tube is fully connected to the fluid connector. Otherwise, the verifier tabs flex radially outwardly from the release sleeve and provide an indication that the tube is not fully connected to the fluid connector. However, when the tube is fully fluidly connected to the connector, the verifier tabs flex radially inwardly and nest within their slots in the release sleeve
Data Source
AI summary
A quick connect coupling having a housing with a throughbore to receive a tube. A verifier is mounted to the housing which nests in the housing when the coupling is fluidly connected. Otherwise, the verifier protrudes outwardly from the housing to provide an indication that the coupling is not fully connected.