Pipe Gasket Segmented Metal Anti-Slip Design
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Solution Overview
Problem
Existing pipe joint gaskets with anti-slip metal segments fail to prevent the separation and fracturing of interconnected, telescoping pipes under high fluid pressure due to excessive axial thrust forces, which also lead to improper positioning and increased insertion force during spigot insertion.
Innovation Solution
A pipe gasket with a compressible body and embedded metal segments featuring a conical inner surface, nose portion, and radially inward teeth, which allows for reduced spigot insertion force and prevents pipe separation by creating distinct load paths that minimize radial loads on the pipe ends, thereby preventing fracturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toothed metal segments are used to prevent pipe separation under pressure, then pipe joint reliability is improved, but excessive axial thrust forces cause the metal segments to over-rotate creating destructive radial loads that fracture the pipe ends
Solution Approach 1:
The metal anti-slip components are divided into multiple discrete segments distributed around the gasket circumference. Each segment independently engages with the spigot surface, distributing the axial thrust forces across multiple contact points rather than concentrating them at a single rotation point, thereby preventing over-rotation and reducing radial loads on the pipe ends.
Solution Approach 2:
The metal segments are embedded within the compressible gasket body rather than being exposed on the surface. This dimensional integration allows the gasket material to cushion and distribute the forces applied to the segments, preventing the segments from over-rotating and creating destructive radial loads while maintaining their ability to prevent pipe separation.
2Reliability
If toothed metal segments are used to prevent pipe separation, then pipe joint reliability is improved, but the gasket translates axially during spigot insertion causing improper positioning and seal failure
Solution Approach 1:
The metal anti-slip segments are integrated into the gasket body as a unified composite structure. The metal segments and gasket material work together as a single functional unit, where the gasket provides both the sealing function and the positioning function, eliminating the separate issue of gasket translation during insertion.
Solution Approach 2:
The metal segments are pre-positioned and embedded within the gasket body during gasket manufacturing. This preliminary positioning ensures that when the gasket is installed, the metal segments are already correctly located to engage the spigot surface, preventing any axial translation that would cause improper positioning or seal failure.
3Reliability
If toothed metal segments are used to prevent pipe separation, then pipe joint reliability is improved, but the force required to insert the spigot into the bell end increases substantially
Solution Approach 1:
The metal segments are embedded within the compressible gasket body at a specific depth and orientation, changing the mechanical parameters of the anti-slip mechanism. This embedding allows the gasket material to deform and cushion the insertion force, reducing the peak force required to insert the spigot while maintaining the segments' ability to prevent pipe separation under pressure.
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 significantly reduces the force required for spigot insertion, prevents pipe separation and fracturing under pressure, and ensures proper seal formation by distributing axial forces effectively through the gasket, reducing the risk of radial loads on the pipe ends.
Implementation Method 1
a compressible body having a heel portion including a conical inner surface
Implementation Method 2
The present invention is directed to a gasket for decreasing the amount of force required to insert a spigot end of a plastic pipe
Implementation Method 3
The metal segments serve to restrain the joint, and in particular, prevent the spigot end of the plastic pipe from retreating out of the bell end of the metal pipe upon pressurization of the joint
Data Source
AI summary
A gasket for preventing separation of interconnected pipes including a compressible body having a plurality of metal segments partially embedded therein. Each of the metal segments includes an inner surface having at least one tooth configured for engaging a spigot end of a pipe and an outer surface having an arm with a substantially flat portion arranged adjacent to a forward section of a retainer groove of the gasket, the substantially flat portion being configured for displacing the segment radially and axially upon insertion of the spigot end into a bell end of the other pipe thereby decreasing the spigot insertion force required to seat the spigot end within the bell end and the gasket.