Corrugated Insert Sealing Gasket for Plastic Pipeline Joint Integrity
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Solution Overview
Problem
Existing sealing gasket systems for plastic pipelines face issues such as dislodgment, twisting, and extrusion under pressure, particularly due to inadequate reinforcement and material compatibility, leading to compromised joint integrity and complex manufacturing processes.
Innovation Solution
A sealing gasket with a hard corrugated ring-shaped insert, either plastic or metal, embedded within the rubber body, which enhances resistance to extrusion and displacement, allowing for easy installation and acting as a joint restraint without the need for external bands or pins, and accommodating rubber shrinkage during molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a homogeneous rubber gasket is used, then the gasket is deformable and easy to install, but it allows dislodgment, twisting, and extrusion under pressure
Solution Approach 1:
The gasket combines rubber material with a rigid plastic or metal reinforcement ring. The rubber provides deformability for easy installation, while the rigid ring prevents dislodgment, twisting, and extrusion under pressure, resolving the contradiction between ease of operation and reliability.
2Reliability
If a rigid plastic or metal reinforcement ring is added to the rubber gasket, then resistance to extrusion and displacement is improved, but the gasket becomes harder to install and manufacture
Solution Approach 1:
The rubber gasket and rigid reinforcement ring are combined into a single integrated component manufactured in one molding operation. The ring is embedded within the rubber body during injection molding, eliminating the need for separate assembly steps and reducing manufacturing complexity while maintaining extrusion resistance.
Solution Approach 2:
The rigid ring is designed with specific geometric parameters (cross-sectional area, position within the rubber, profile shape) that optimize both its reinforcement function and its compatibility with the molding process, allowing it to be successfully integrated without excessive manufacturing complexity.
3Reliability
If a metal or plastic reinforcing band is bonded to the rubber gasket, then joint restraint is improved, but bonding compatibility issues and separation occur
Solution Approach 1:
Instead of bonding separate components, the rigid reinforcement ring and rubber gasket are merged into a single monolithic component manufactured through injection molding. The ring is embedded within the rubber body during the molding process, eliminating bonding operations and associated compatibility issues while maintaining joint restraint functionality.
4Manufacturing precision
If the insert is designed to fit the final product dimensions, then dimensional precision is improved, but rubber shrinkage during curing causes the insert to not fit in the enlarged injection cavity
Solution Approach 1:
The insert dimensions are adjusted as a manufacturing parameter to account for rubber shrinkage during curing. The insert is designed with slightly enlarged dimensions that accommodate the shrinkage, ensuring it fits properly in the enlarged injection cavity while still achieving the desired final product dimensions after curing.
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 gasket provides secure retention and optimal sealing performance under various pressure conditions, simplifies installation and manufacturing, and functions as a joint restraint system, ensuring reliable pipe joint integrity.
Implementation Method 1
The hard corrugated ring-shaped insert acts to prevent extrusion of the gasket from the raceway provided in the female bell socket end of the thermoplastic pipe
Implementation Method 2
a main body portion formed of rubber which, when viewed in cross section, includes a leading nose region, a lower compression region and a trailing tail region
Data Source
AI summary
A pipe sealing gasket is shown which is designed to be received within a raceway provided within a socket end of a female bell plastic pipe end which is assembled with a mating male spigot pipe end to form a plastic pipe joint. The raceway in the female bell plastic pipe end is preformed during manufacture and the gasket is installed thereafter. The gasket has a rubber body portion which is reinforced by a hard corrugated ring-shaped insert. The hard corrugated ring-shaped insert acts to prevent extrusion of the gasket during a variety of pressure conditions as well as preventing displacement during field assembly.