Fusion Welding Socket for Double-Walled Plastic Conduits
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Solution Overview
Problem
Existing fusion welding sockets for double-walled plastic conduits do not ensure reliable communication between annular spaces and can cause pressure drops and leakage issues when joining multiple conduits, while also being costly and difficult to install.
Innovation Solution
A fusion welding socket with a main body having first and second end portions and an intermediate portion with embedded heating coils, featuring an annular passageway that connects the annular spaces of the conduits, reducing pressure drop and ensuring secure leakage detection across the entire length of the installation, and channels for easy communication and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate components are used to join double-walled conduits, then reliable joining of outer and inner pipes can be achieved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent merges multiple separate joining components into a single integrated fusion welding socket that can simultaneously join both outer and inner pipes of double-walled conduits. The socket includes a body with an outer cavity for receiving outer pipes and an inner cavity for receiving inner pipes, along with heating elements positioned to weld both pipes simultaneously, eliminating the need for multiple separate coupling devices.
Solution Approach 2:
The fusion welding socket is designed as a universal device that performs multiple functions: it joins outer pipes, joins inner pipes, provides heating elements for both welding operations, and includes passageways for pressure equalization. This multi-functional design replaces what would traditionally require multiple specialized components.
2Reliability
If traditional fusion welding sockets are used, then joining of simple pipe conduits is achieved, but communication between annular spaces is not ensured
Solution Approach 1:
The patent introduces passageways as intermediary channels that connect the annular spaces of adjacent conduits through the socket body. These passageways allow pressure equalization and communication between the secondary containment spaces, ensuring that pressure changes can be detected along the full length of the conduit system while maintaining the structural integrity of the joint.
3Reliability
If annular space communication is provided, then leakage detection is enhanced, but pressure drop increases
Solution Approach 1:
The passageways are strategically positioned and sized to provide adequate pressure communication for leakage detection while minimizing cross-sectional area to reduce pressure drop. The heating elements are locally positioned to provide focused heating where needed for welding, rather than heating the entire socket uniformly, thus reducing energy loss.
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 socket facilitates reliable communication and leakage detection across long conduit installations with minimal pressure drop, enhanced security against leakage, and cost-effective manufacturing, while allowing for easy installation and use of a single component for joining double-pipe conduits.
Implementation Method 1
incorporates coils of resistance wires or filaments which, when energized cause the material in the welding socket to fuse together with the material in the outer and inner pipes at the positions of said coils
Implementation Method 2
The material in the inner surface of the socket and in contact with the material at the pipe ends will therewith fuse together locally as a result of the heat generated in the resistance wires
Data Source
Figure 1~4
Figure 5~6
Figure 7~9
AI summary
A fusion welding socket (30, 130, 230) for coupling together double walled plastic conduits (10, 20, 110, 20), which double walled conduits comprise an inner pipe (12, 22, 112, 122, 212, 222), an outer pipe (11, 21, 111, 21, 211, 221) surrounding the inner pipe and an annular space (13, 23, 113, 123, 213, 223) arranged between the inner and outer pipes. The fusion welding socket comprises a main body (31, 131, 231) comprising a first end portion (32, 132, 232), a second end portion (33, 133, 233) and an intermediate portion (34, 134, 234) arranged longitudinally between the first and second end portions. The intermediate portion has at least one inner diameter which is smaller than the inner diameters of the first and second end portions. First (35a), second (35b) and third (35c-d) heating coils embedded in the first end portion, the second end portion and the intermediate portion respectively for fusing together the first and second end portions with a respective outer pipe of a first and second conduit and the intermediate portion with a respective inner pipe of the first and second conduit. A passageway (39, 41-43, 139, 141-144, 239, 241.242) comprising an annular space (39, 139, 239) is arranged to connect the annular spaces of the first and second conduit after fusion.