Captured Pipe Coupling With Self-Checking Retainer Assembly
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Solution Overview
Problem
Existing mechanical pipe couplings require disassembly and reassembly during installation, which is time-consuming and labor-intensive, and lack a mechanism to ensure proper installation of retainers, leading to potential leaks and mechanical instability under pressure.
Innovation Solution
A coupling design featuring a spring assembly that biases segments apart for easy insertion of pipe elements, combined with an adjustable attachment mechanism and retainer system that ensures proper alignment and engagement through angularly oriented teeth and tabs, allowing for visual confirmation of correct assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional mechanical couplings are used, then the pipe elements can be joined securely under pressure, but the installation process requires time-consuming disassembly and reassembly
Solution Approach 1:
The coupling is divided into a body portion and a retainer component that can be separately assembled. The retainer is installed first within the coupling body, allowing the pipe element to be inserted without requiring complete disassembly of the coupling structure. This segmentation enables partial assembly that speeds up installation while maintaining structural integrity.
Solution Approach 2:
The retainer is pre-installed within the coupling body before the pipe element is inserted. This preliminary action ensures that the retention mechanism is already in place and properly positioned, eliminating the need to assemble the entire coupling after pipe insertion and reducing overall installation time.
2Reliability
If traditional couplings are used, then mechanical engagement can be achieved, but there is no mechanism to ensure proper retainer installation
Solution Approach 1:
The retainer features asymmetric tooth orientation where the teeth are angled to engage properly with the pipe element groove only in the correct installation orientation. This asymmetric design provides self-checking functionality - if the retainer is installed incorrectly, the teeth will not engage with the groove, immediately alerting the installer to the error without requiring additional verification steps.
Solution Approach 2:
The coupling design incorporates self-verifying features where the asymmetric tooth-groove engagement automatically indicates correct installation. The system serves itself by providing built-in feedback through the mechanical interaction of components, eliminating the need for separate verification procedures or complex installation tools.
3Reliability
If angularly oriented teeth are used, then self-actuating engagement is achieved, but improper installation cannot be detected before pressurization
Solution Approach 1:
The asymmetric tooth orientation creates a mechanical keying system where correct engagement is physically possible only in the proper orientation. The groove geometry and tooth angles are designed so that improper installation results in obvious mechanical interference or inability to assemble, providing immediate detection without requiring pressurization or specialized inspection tools.
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
Facilitates quicker and more reliable installation of pipe couplings by eliminating the need for full disassembly and providing a self-actuating mechanism that enhances mechanical engagement and leak resistance under pressure.
Implementation Method 1
A spring assembly joins a first end of the first segment to a first end of the second segment. The spring assembly biases the segments away from one another.
Data Source
AI summary
A preassembled combination connects a captured pipe element to a second pipe element. First and second segments are connected end to end surrounding a central space for axially receiving the second pipe element. The segments are configured to be drawn toward one another and into engagement with the pipe elements. An annular body forms the captured pipe element. An end face of the captured pipe element is retained within the central space by engagement between a bead projecting from a sealing surface of the captured pipe element and the coupling assembly.