Electric Terminal Friction Coupling for Switching Device
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Solution Overview
Problem
Assembled type medium voltage switching device electric pole units require numerous fasteners for assembly, complicating insulation and reducing mechanical resilience, leading to increased assembly time and vulnerability to mechanical stresses and vibrations.
Innovation Solution
The electric terminal for the medium voltage switching device employs frictional mechanical coupling with dovetail or conical profiles between the terminal and the insulating housing, reducing the need for fasteners and enhancing dielectric strength and mechanical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If numerous fasteners (screws, bolts) are used to assemble the electric terminal and insulating housing, then the mechanical connection strength is improved, but the assembly time increases and the dielectric distance is reduced
Solution Approach 1:
The electric terminal is merged with the insulating housing through co-molding to form an embedded type assembly, eliminating the need for separate fasteners and reducing assembly steps while maintaining structural integrity
Solution Approach 2:
The mechanical fastening system (screws, bolts) is replaced with an integrated embedding structure where the terminal is directly formed within the housing material, substituting mechanical assembly with a unified structural design
2Strength
If numerous fasteners are used to assemble the electric terminal and insulating housing, then the mechanical connection strength is improved, but the dielectric distance among internal components is reduced
Solution Approach 1:
The terminal and housing are merged into a single embedded structure, eliminating fasteners that would otherwise compromise dielectric distances and create potential insulation failure points
Solution Approach 2:
The fastening function is extracted from the assembly process by designing the terminal to be inherently embedded within the housing material, removing the need for fasteners that interfere with dielectric insulation
3Strength
If numerous fasteners are used to assemble the electric terminal and insulating housing, then the mechanical connection strength is improved, but the resistance to mechanical stresses and vibrations is reduced
Solution Approach 1:
The terminal and housing are combined into a unified embedded structure that distributes mechanical stresses throughout the material volume, providing superior vibration and stress resistance compared to discrete fastener connections
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 solution significantly reduces the number of fasteners required, simplifies assembly, improves dielectric strength, and increases resistance to mechanical stresses and vibrations, while maintaining cost-effectiveness in manufacturing.
Implementation Method 1
The first coupling surfaces (131A, 132A, 231A, 232A) of the electric terminal (1, 2) abut against the second coupling surfaces (311, 312, 321, 322) of the insulating housing (3), in such a way to obtain a mechanical coupling by friction between said electric terminal and said insulating housing
Data Source
AI summary
An electric terminal for an electric pole unit of a switching device, the electric terminal being adapted to be electrically connected to a current breaking unit of the electric pole unit and to an external conductor and being adapted to be inserted in a corresponding shaped port of an insulating housing of the electric pole unit. The electric terminal comprises one or more first coupling surfaces mating with one or more second coupling surfaces of the insulating housing, the first coupling surfaces abutting against the second coupling surfaces when the electric terminal is inserted in the corresponding shaped port of the insulating housing in such a way to obtain a mechanical coupling by friction between the electric terminal and the insulating housing.