Electrofusion Joint Insulated Heating Wire to Prevent Short Circuits
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Solution Overview
Problem
Electrofusion joints in resin pipes are prone to short circuits when heating wires come into contact, leading to inadequate fusion strength due to gaps between pipes, which can allow foreign matter to mix with high-purity liquids.
Innovation Solution
The electrofusion joint incorporates a heating wire with an insulating cover film having a melting point of at least 230 degrees, and an outer layer formed from polyolefin resin, preventing contact between conducting wires and ensuring sufficient temperature for strong fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pipe is pressed against the electrofusion joint to eliminate gaps, then foreign matter contamination is prevented, but the heating wires may come into contact and cause short circuits
Solution Approach 1:
The patent introduces an insulating cover film as an intermediary layer between the heating wire and the pipe wall. This mediator prevents direct contact between the heating wire and the pipe even when the pipe is pressed against the joint to eliminate gaps, thereby avoiding short circuits while maintaining the ability to prevent foreign matter contamination.
Solution Approach 2:
The insulating cover film is pre-applied to the heating wire before installation. This preliminary protective action ensures that when the pipe is pressed against the joint during operation, the heating wire is already protected from contact with the pipe wall, preventing short circuits before they can occur.
2Strength
If the heating temperature is increased to ensure strong fusion, then fusion strength is improved, but the insulating cover film may melt causing short circuits
Solution Approach 1:
The patent changes the thermal parameter of the insulating cover film by selecting materials with high melting points (polyimide resin with melting point of at least 230°C, or polyolefin resin with melting point of at least 100°C). This parameter change allows the cover film to withstand the high temperatures required for strong fusion without melting, thereby maintaining both fusion strength and electrical insulation reliability.
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 design minimizes the risk of short circuits and ensures robust fusion strength by maintaining the insulating cover film integrity during the fusion process, even when pipes are pressed against the stopper to eliminate gaps.
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
Implementation Method 2
The insulating cover film has a melting point of at least 230 degrees... prevents contact between the conducting wires of the heating wire
Implementation Method 3
the resin on the inner peripheral part of the insertion openings and the resin on the outer peripheral part of the pipe are fused around the heating element
Data Source
AI summary
An electrofusion joint includes a main body and a heating wire. The main body is configured to be connected to a resin pipe containing a thermoplastic resin. The heating wire is in the main body. The heating wire includes a conducting wire and an insulating cover film that is around the conducting wire. The insulating cover film has a melting point of at least 230 degrees.