Compressible Isolation Gap Plug for Compact Air-Insulated Switches
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Solution Overview
Problem
Existing switchgear designs face challenges in maintaining sufficient dielectric strength between switch contacts in the open position while minimizing switch complexity and size, particularly when using specialized dielectric materials like silicon fluid.
Innovation Solution
A switch design incorporating a compressible dielectric plug that provides increased dielectric strength by axially compressing and radially expanding between switch contacts when open, and a rigid plug with a return spring mechanism to ensure electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialized dielectric materials like silicon fluid are used to increase dielectric strength, then the dielectric strength between switch contacts is improved, but the device complexity and cost increase
Solution Approach 1:
The patent changes the physical state of the dielectric material from liquid (silicon fluid) to solid (compressible material), and utilizes the parameter change of radial expansion under axial compression to achieve the desired dielectric strength without requiring specialized liquid dielectric materials
Solution Approach 2:
The patent replaces expensive specialized dielectric materials (silicon fluid) with a simpler, compressible solid material that can be easily replaced if needed, reducing both material cost and system complexity
2Volume of moving object
If the switch size is reduced, then the compactness is improved, but the dielectric strength between contacts deteriorates
Solution Approach 1:
The patent transitions from a one-dimensional gap distance approach to a three-dimensional solution by having the dielectric material expand radially outward to fill the isolation gap, maintaining dielectric strength while allowing for compact switch dimensions
Solution Approach 2:
The patent utilizes the parameter change of the dielectric material under compression - when axially compressed, the material radially expands to fill the isolation gap, providing consistent dielectric strength regardless of the initial gap size, enabling compact switch design
3Device complexity
If air is used as the dielectric medium, then the device complexity is reduced, but the dielectric strength is insufficient
Solution Approach 1:
The patent introduces a compressible dielectric material as an intermediary substance between the switch contacts that enhances the dielectric strength of air without requiring a complete replacement of the air medium or complex specialized materials
Solution Approach 2:
The patent creates a composite dielectric system combining air with a compressible dielectric material that expands to fill the isolation gap, achieving enhanced dielectric strength while maintaining the simplicity of air-insulated design
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 design maintains effective dielectric integrity to prevent arcing between contacts, reduces switch complexity, and allows for compact sizing without the need for specialized dielectric materials.
Implementation Method 1
the plug is a compressible plug and is positioned between the upper end of the contact pin and the plate and the upper housing includes an interface. The switch also includes a stop ring positioned within the lower housing, where the drive rod extending through the stop ring. The drive rod is actuated to pull the insulative rod through the stop ring so that the contact pin disengages the upper contact and the contact pin is pulled into the lower housing and the lower end of the contact pin engages the stop ring which causes the insulative plug to axially compress between the plate and the first end of the contact pin and radially expand into the interface.
Data Source
AI summary
A switch including an upper housing, a lower housing, a contact pin slidable between and within the upper and lower housings, an open chamber between the upper and lower housings and a viewing window surrounding the chamber. The contact pin is positioned in the chamber and is visible through the window when the switch is in the closed position and is positioned within the lower housing and not visible through the window when the switch is in the open position. The switch further includes an insulative plug coupled to the contact pin and being configured to provide electrical isolation between the contact pin and an upper contact when the switch is in the open position.