Bonded Pipe Joint Using Spin Welding for Leak-Tight Strength
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Solution Overview
Problem
Existing pipe devices suffer from moderate tensile and torsional strength, leakage issues, and require expensive auxiliary elements like clamps to enhance connectivity, which are complex to fit and only partially address the problems.
Innovation Solution
A pipe device with a bonded connection between the pipe and connecting member, utilizing materials like PA 666, PPA, and PA 12, where a spin-welded joint provides high tensile and torsional strength, is liquid-tight, and eliminates the need for additional sealing elements, ensuring durability and low manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a push-fit connection with holding lugs is used, then the connection is simple to make, but the tensile strength and torsional strength are moderate and leakage occurs
Solution Approach 1:
The patent replaces the purely mechanical push-fit connection with a combination of mechanical insertion and thermal bonding. The bonding process uses heat and pressure to create a permanent molecular-level connection between the pipe and connecting member, substituting the weak mechanical interlock with a strong chemically-bonded joint that resists tensile and torsional forces.
Solution Approach 2:
The bonding process utilizes phase transitions of the thermoplastic materials involved. Heat is applied to melt the materials at the bonding interface, allowing them to flow and fuse together. Upon cooling, the materials solidify to create a permanent, strong bond. This phase change from solid to liquid and back to solid enables the creation of a robust connection.
2Strength
If auxiliary elements like clamps are added to increase tightness and strength, then the tensile and torsional strength improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the connection function and sealing function into a single integrated bonding process. The thermal bonding creates both the structural connection and the fluid-tight seal simultaneously, eliminating the need for separate clamps, gaskets, or other auxiliary sealing elements that would add complexity.
Solution Approach 2:
The patent extracts and eliminates the need for auxiliary sealing elements and strengthening components. By using thermal bonding to create an inherently strong and tight connection, the design removes unnecessary parts like clamps, additional seals, and reinforcement elements, simplifying the overall system.
3Reliability
If auxiliary sealing elements are added to prevent leakage, then the tightness improves, but the manufacturing cost and device complexity increase
Solution Approach 1:
The bonding process is self-sealing. The heat and pressure applied during bonding cause the thermoplastic materials to flow into each other and form a monolithic, leak-proof joint. The connection creates its own seal through the bonding process itself, without requiring separate sealing rings, gaskets, or other auxiliary sealing components.
4Strength
If a bonded connection is created through melting and curing, then the tensile strength and torsional strength are high and leakage is minimized, but the manufacturing process becomes more complex
Solution Approach 1:
The patent changes the physical parameters (temperature and pressure) of the materials during the bonding process. By heating the materials to their melting point and applying pressure, the materials transition to a molten state where they can fuse. Upon cooling and pressure release, the materials solidify to create a strong bond. This parameter change enables bonding without complex equipment.
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 bonded connection achieves high tensile and torsional strength, low leakage rates, and simplifies handling while reducing costs, as it is easy to manufacture and aesthetically clean, without requiring additional sealing elements.
Implementation Method 1
The bonded connection (or the bonded connections or connection regions) between the first material and the second material are formed by melting and curing the first material and/or by melting and curing the second material
Implementation Method 2
The bonded connection (or the bonded connections or connection regions) between the first material and the second material are formed by melting and curing the first material and/or by melting and curing the second material
Implementation Method 3
A pipe device with a bonded connection between the pipe and connecting member, utilizing materials like PA 666, PPA, and PA 12, where a spin-welded joint provides high tensile and torsional strength
Data Source
AI summary
A pipe device includes a pipe and a connection element. The pipe has a pipe jacket that has an inner surface and an outer surface and forms a flow channel. The connection element forms a through-channel that extends from a connection piece consisting of a first material (M1) and having a first opening to a second opening. The pipe jacket is positioned on the connection piece with a first pipe end consisting of a second material (M2). A bonded connection is formed between the first material (M1) and the second material (M2) in a contact region between the inner surface of the pipe jacket and a peripheral surface of the connection piece.