PVCO Pipe Joint Seal Assembly to Prevent Roll-Out
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Solution Overview
Problem
Existing flexible seals for Molecularly Oriented Polyvinyl Chloride (PVCO) pipes are prone to 'rolling out' of the groove when engaged, leading to a complete failure of the seal, which is a significant issue in maintaining a fluid-tight connection.
Innovation Solution
A seal assembly comprising a monolithic resilient material with a stiffener pocket, designed to be user-installed into the bell end of a PVCO pipe, featuring a spigot-side and bell-side sealing surface, a main sealing lobe, and an annular stiffener that provides mechanical support and ensures a robust, fluid-tight seal by withstanding the insertion process without damage or degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible seal is used to seal PVCO pipes, then the seal can be deformed to form a fluid-tight connection, but the seal is prone to rolling out of the groove when engaged
Solution Approach 1:
The seal assembly combines a flexible seal body made of resilient material with a stiffener component to create a composite structure. This composite design provides both the flexibility needed for sealing and the structural support to prevent rolling out, resolving the contradiction between seal reliability and installation stability.
Solution Approach 2:
The seal is divided into separate components: a flexible seal body and a stiffener. This segmentation allows each component to perform its specific function - the seal body provides sealing through deformation while the stiffener prevents rolling out during installation, thereby improving both reliability and installation stability.
2Ease of operation
If a stiffener is added to prevent rolling out, then installation stability is improved, but the device complexity increases
Solution Approach 1:
By segmenting the seal into a seal body and a stiffener, the design achieves installation stability without excessive complexity. The stiffener is a simple annular component with a pocket, and the modular design allows for easy assembly and manufacturing, balancing improved installation stability with acceptable device complexity.
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 seal assembly effectively maintains a fluid-tight seal along all potential leak paths between the pipes, preventing 'rolling out' and ensuring reliable performance even under insertion forces, without the need for adhesives or complex overmolded designs.
Implementation Method 1
a flexible seal which is deformed or deflected by the spigot end in an attempt to form a fluid-tight seal
Implementation Method 2
an annular stiffener... provides mechanical support and ensures a robust, fluid-tight seal by withstanding the insertion process without damage or degradation
Data Source
AI summary
A seal assembly is configured for use at PVCO pipe junctions. The seal assembly includes a main seal body made of a monolithic resilient material, such as rubber, and a stiffener. The seal has a stiffener pocket sized and configured to accept the stiffener, such that the stiffener can be assembled to the seal body by hand. This assembly can then be installed into the bell end of a first PVCO pipe, and a spigot end of a second PVCO pipe may then be inserted into the bell end and engaged with a main sealing lobe of the seal assembly. The seal assembly is configured to reliably withstand the insertion process, without damage or degradation to the sealing structures. Once installed, the seal assembly provides a robust fluid-tight seal along all potential leak paths between the seal assembly and the first and second pipes.