Encapsulated Rieber Joint Gasket Ring to Prevent Dislodgment
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Solution Overview
Problem
Traditional reinforced gaskets for Rieber joints are susceptible to damage during the pipe manufacturing process, particularly when the pipe female end is stretched over a mandrel, leading to potential dislodgment and reduced reliability of the joint.
Innovation Solution
A reinforced gasket design featuring a flexible annular gasket body encapsulating a reinforcing/stiffening ring with radial stiffening ribs and a tail support wall, which is installed during the belling process to prevent over-compression and ensure a secure fit within the bell groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional reinforced gasket is used during pipe manufacturing, then the gasket provides structural support and pre-compression, but the flexible gasket body is susceptible to damage when the pipe female end is stretched over the mandrel
Solution Approach 1:
The gasket is segmented into two distinct functional components: a rigid reinforcing ring that provides structural support and resists deformation during manufacturing, and a flexible gasket body that provides sealing functionality. The rigid ring acts as an independent load-bearing element that protects the flexible body from damage during the stretching process.
Solution Approach 2:
The gasket combines two materials with complementary properties: a rigid material (such as metal or rigid plastic) for the reinforcing ring that provides strength and stiffness, and a flexible material (such as rubber or elastomer) for the gasket body that provides sealing and compliance. This composite structure allows the gasket to simultaneously withstand manufacturing stresses and provide effective sealing.
2Ease of manufacture
If the pipe female end is stretched over the mandrel during manufacturing, then the bell is formed, but the flexible gasket body may be damaged or dislodged
Solution Approach 1:
The rigid reinforcing ring is installed beforehand to cushion and absorb the mechanical stresses and deformations that occur during the bell formation process. It acts as a protective barrier that prevents the flexible gasket body from being damaged or dislodged when the pipe end is stretched over the mandrel.
Solution Approach 2:
Different parts of the gasket have different mechanical properties tailored to their specific functions: the reinforcing ring has high rigidity and strength to withstand manufacturing stresses, while the gasket body has high flexibility to conform to surfaces and provide sealing. This localized differentiation of material properties optimizes both manufacturing durability and sealing performance.
3Force
If a rigid reinforcing ring is used to provide structural support, then pre-compression is improved, but the gasket body may be damaged during the stretching process
Solution Approach 1:
The rigid reinforcing ring acts as an intermediary element between the external stretching forces and the flexible gasket body. It intercepts and distributes the mechanical loads, preventing direct transmission of harmful stresses to the gasket body, thereby maintaining both pre-compression and protecting against damage.
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 design enhances the structural integrity of the gasket, preventing damage and ensuring a reliable, fluid-tight seal by maintaining consistent pressure and alignment during pipe assembly, thereby improving the joint's reliability and reducing the risk of gasket dislodgment.
Implementation Method 1
the flexible gasket body is compressed between the two pipes and prevents fluid leakage therebetween
Implementation Method 2
The female end of a pipe is then heated up and stretched over the cylindrical mandrel and the reinforced gasket. The cylindrical mandrel has a larger diameter than the female end of the pipe and, when the female end is stretched over the mandrel, the female end radially expands, forming the bell.
Implementation Method 3
The female end of a pipe is then heated up and stretched over the cylindrical mandrel and the reinforced gasket. The cylindrical mandrel has a larger diameter than the female end of the pipe and, when the female end is stretched over the mandrel, the female end radially expands, forming the bell.
Implementation Method 4
Thereafter, the female end is cooled (typically by spraying cool water over the pipe) which causes the female end to shrink.
Data Source
AI summary
A reinforced gasket for use in a Rieber joint can include a flexible annular gasket body and a reinforcing/stiffening ring. The flexible annular gasket body can include a leading nose section, a trailing tail section, and a radial tip section. The reinforcing/stiffening ring can include an inner diameter cylindrical wall having a leading edge and a trailing edge, and an annular angled front wall extending from the leading edge of the inner diameter cylindrical wall. The flexible annular gasket body can be molded around and encapsulates the reinforcing/stiffening ring. The leading edge of the inner diameter cylindrical wall can extend into the leading nose section, the annular angled front wall can extend into the radial tip section, and the trailing edge of the inner diameter cylindrical wall can extend into the trailing tail section. Preferably, the reinforced gasket includes stiffening ribs extending between the cylindrical wall and angled front wall.