Two-Component Pipe Gasket With Retainer Ring Against Displacement
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Solution Overview
Problem
Existing sealing systems for plastic pipelines with pre-formed sockets face challenges such as gasket displacement during installation, storage, or transport, and the need for expensive high-temperature resistant plastics. Additionally, these systems lack recyclability and flexibility in material selection.
Innovation Solution
A two-component sealing gasket with a softer elastic portion and a harder plastic portion, where the plastic serves as a reinforced region to prevent displacement. The gasket components are molded separately and assembled without bonding, allowing for various material combinations and easy replacement of parts. The hard plastic component can include gripping structures for enhanced restraint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single-component elastomeric gasket is used, then the gasket can be easily deformed and inserted by hand, but it becomes dislodged, twisted, or extruded during installation and under pressure
Solution Approach 1:
The gasket combines two different materials with complementary properties: an elastomeric material for flexibility and sealing, and a thermoplastic material for structural stability and restraint resistance. This composite structure allows the gasket to be easily inserted while maintaining sealing integrity under pressure.
Solution Approach 2:
The gasket is divided into distinct functional zones: a flexible elastomeric portion for sealing contact and a rigid thermoplastic retainer ring for structural support. This segmentation allows each material to perform its optimal function without compromising the other.
2Temperature
If expensive high-temperature resistant plastics are used, then the gasket can withstand high processing temperatures, but the cost increases significantly
Solution Approach 1:
High temperature resistance is applied only where needed - in the thermoplastic retainer ring that contacts the hot pipe material during insertion. The elastomeric sealing portion uses standard materials, reducing overall cost while maintaining necessary temperature resistance in critical areas.
Solution Approach 2:
The thermoplastic retainer ring is pre-formed at the pipe factory during pipe manufacturing, allowing it to be molded at high temperatures when materials are more workable. This eliminates the need for expensive high-temperature resistant materials throughout the entire gasket, as the critical temperature exposure occurs during a brief factory process rather than field installation.
3Device complexity
If the gasket is designed as a single integrated component, then the structure is simple, but the components cannot be replaced individually for recyclability or contamination issues
Solution Approach 1:
The gasket is designed as two separable components - an elastomeric sealing portion and a thermoplastic retainer ring - that can be manufactured separately and assembled. This allows individual components to be replaced based on contamination or wear, and enables different material combinations to be used for different application requirements.
Solution Approach 2:
The elastomeric sealing portion is inserted within or around the thermoplastic retainer ring structure, creating a nested configuration. This nested design maintains structural simplicity while enabling component separation for replacement and recycling, as each component can be accessed and replaced independently.
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 design ensures reliable sealing and resistance to displacement during field applications, while allowing for cost-effective material selection and recyclability. The ability to replace individual components addresses specific contamination or performance needs, and the design avoids the use of expensive high-temperature resistant plastics.
Implementation Method 1
The two components are molded separately and then assembled together by stretching the elastic component over at least a portion of the hard plastic component
Data Source
AI summary
A sealing gasket is shown which is designed to be used in making up a sealed pipe joint in a plastic pipeline conveying fluids, such as a water or sewer pipeline. The sealing gasket is a two-component gasket with an elastomeric component and a plastic component. The elastomeric component is stretched over a portion of the plastic component during assembly. Since the two components of the gasket are not permanently bonded to one another, the gasket can be disassembled, allowing various combination s of seal and retainer designs. The gasket can be removed and replace by another gasket after the initial installation. The hard plastic component can be provided with a gripping structure which acts as a restraint mechanism when the sealing gasket is in use.