Power Cable Polymer Joint with Embedded Metal Pipe
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Solution Overview
Problem
Freestanding dry terminal joints using resin tubes fail to maintain a horizontal position, leading to instability and potential hanging of the tip portion, which is a limitation compared to using porcelain insulators that provide better support.
Innovation Solution
A power cable polymer joint is designed with a polymeric insulator tube featuring a metal embedded pipe and flange, both covered with semi-conductive polymer materials, which allows for free-standing properties even when used horizontally by distributing the weight effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a resin tube is used as the core of the insulation layer, then the weight of the terminal joint is reduced, but the joint cannot maintain a horizontal position and the tip portion may hang down
Solution Approach 1:
The patent uses a composite structure combining a resin tube insulation layer with a metal embedded pipe. The metal pipe provides the necessary mechanical strength and rigidity to maintain horizontal position, while the resin tube maintains the lightweight advantage. This composite material approach resolves the contradiction between weight reduction and stability maintenance.
Solution Approach 2:
The metal embedded pipe is strategically positioned within the resin tube insulation layer at specific locations to provide localized structural support. This allows the majority of the insulation layer to remain lightweight resin while specific areas gain the strength needed to prevent hanging, resolving the stability issue without compromising overall weight reduction.
2Stability of the object's composition
If porcelain insulator is used, then the joint can maintain horizontal position, but the weight increases significantly
Solution Approach 1:
Instead of using heavy porcelain insulator throughout, the patent employs a composite structure with resin tube as the primary insulation material and metal embedded pipe as a structural reinforcement. This combination achieves the horizontal position stability of porcelain while maintaining the lightweight advantage of resin materials.
Solution Approach 2:
The patent extracts only the essential function of the porcelain insulator (providing structural support for horizontal positioning) and implements it through a lightweight metal-resin composite structure, rather than using the heavy porcelain material itself. This allows weight reduction while preserving the critical stability function.
3Strength
If a metal embedded pipe is added to the polymeric insulator tube, then structural strength and horizontal position stability are improved, but the device complexity increases
Solution Approach 1:
The patent merges the metal embedded pipe with the polymeric insulator tube into an integrated structure where the metal pipe is embedded within the polymer matrix. This combining approach provides enhanced structural strength while avoiding the complexity of separate assembly components, as the metal and polymer work together as a unified structural element.
Data Source
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AI summary
A power cable polymer joint includes a polymeric insulator tube including a cable insertion hole into which a stripped end portion of a power cable is inserted. The polymeric insulator tube includes an insulation including a polymer-based material, an embedded pipe including a metal and embedded on an inner peripheral surface of the insulation so as to face the end portion of the power cable, and a first semi-conductive portion including mainly a polymer-based material and covering an outer peripheral surface of the embedded pipe.