Electrofusion Joint Stopper Heating for Clevis-Free Pipe Fusion
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Solution Overview
Problem
Electrofusion joints used in resin pipes often result in the retention of water and chemical solutions due to turbulent flow, leading to microbial propagation and quality deterioration, and existing designs face issues with clevis and convex portion formation during the fusion process.
Innovation Solution
The electrofusion joint incorporates a dual heat generating system with varying heating wire densities and configurations to control temperature distribution, preventing early fusion on the side surface and reducing the force required for connection, thus minimizing clevis and convex portion formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating wire is provided in the stopper portion to reduce clevis occurrence, then clevis between resin pipe and stopper portion is reduced, but when the stopper portion is thin the resin amount is insufficient causing deformation, and when thick the heating is insufficient generating clevis
Solution Approach 1:
The heating wire is divided into multiple lines (first line and second line) arranged in different directions within the stopper portion. This segmentation allows each line to contribute to heating different regions, enabling sufficient heat generation even when the stopper portion is thin, while preventing resin deformation through distributed heating control
Solution Approach 2:
Multiple heating wires are strategically positioned at different locations and orientations within the stopper portion to create localized heating zones. This ensures uniform heat distribution across the fusion interface, preventing both insufficient heating (which causes clevis) and excessive concentrated heat (which causes resin deformation)
2Ease of manufacture
If conventional electrofusion joint is used, then pipe connection is achieved, but water and chemical solution retain in the pipe due to turbulent flow causing microbial propagation and quality deterioration
Solution Approach 1:
Instead of attempting to eliminate turbulent flow through complex joint geometry, the invention inverts the approach by adding a flow straightening component that actively converts turbulent flow into laminar flow. This component is integrated into the joint structure, transforming the harmful turbulent flow pattern into a beneficial laminar flow pattern that prevents solution retention and microbial growth
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
This approach effectively suppresses the occurrence of clevis and convex portions, ensuring a stable bead formation and improved water and chemical solution quality by evenly heating the joint, reducing the risk of microbial growth and maintaining purity.
Implementation Method 1
a heating element is made to generate heat in a state in which the pipes to be connected have been inserted into the insertion openings of the electrofusion joint
Data Source
AI summary
The electrofusion joint includes a tubular main body, a stopper portion, a first heat generating section, and a second heat generating section. The tubular main body includes a joint receiving portion. The stopper portion projects inward on the inner surface of the main body. The first heat generating section includes a heating wire wound and arranged at the joint receiving portion. The second heat generating section includes a heating wire wound so that wound parts are adjacent to each other and the heating wire is disposed in the stopper portion. The first heat generating section includes at least one heat generating portion in which the heating wire is wound so that the wound parts are adjacent to each other.