Flexible Diaphragm Seal for High Voltage Switch Arc Prevention
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Solution Overview
Problem
Conventional high voltage switches face issues with arcing between the switch assembly and actuating mechanisms, leading to potential failure or damage, and existing solutions like fiberglass pull rods occupy significant physical space.
Innovation Solution
A high voltage electrical switch design featuring a tubular housing with a diaphragm that includes a first and second tubular portion with a shoulder portion, where the diaphragm is positioned between the interface and operating end to prevent voltage arcing, and the diaphragm is frictionally engaged with the housing and operating rod, allowing for movement that deforms the shoulder portion to prevent arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lengthy fiberglass pull rod is used to connect the actuating mechanism to the switch contact, then arcing between the switch assembly and actuating mechanism is prevented, but the physical space required increases significantly
Solution Approach 1:
The diaphragm is divided into two tubular portions with different diameters, creating a segmented structure that provides both electrical insulation and mechanical flexibility. The first tubular portion (larger diameter) provides the primary insulation barrier, while the second tubular portion (smaller diameter) allows for movement, effectively segmenting the insulation function to reduce overall space requirements while maintaining arc prevention capability.
Solution Approach 2:
The diaphragm incorporates a deformable shoulder portion that can dynamically change shape during operation. When the operating rod moves, the shoulder portion deforms to accommodate the movement while maintaining the electrical insulation barrier, replacing the static lengthy fiberglass rod with a dynamic, space-efficient structure.
2Reliability
If a rigid insulative rod is used to extend through the enclosure seal, then electrical insulation is maintained, but the device complexity and installation difficulty increase
Solution Approach 1:
The diaphragm transitions from a rigid insulative rod to a flexible membrane structure that can deform during operation. This dynamic structure simplifies installation by eliminating the need for precise alignment and securement of long rigid rods, while maintaining electrical insulation through its deformable but continuous insulating barrier.
Solution Approach 2:
The invention replaces the rigid fiberglass rod with a flexible diaphragm membrane that provides electrical insulation through its thin film structure. This flexible shell approach simplifies the overall device complexity by eliminating the need for complex mounting arrangements required for rigid rods, while maintaining the necessary insulation properties.
3Volume of moving object
If the diaphragm includes a deformable shoulder portion to accommodate operating rod movement, then space is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The diaphragm design incorporates specific geometric parameters including the shoulder portion dimensions, wall thickness, and tubular portion ratios that are optimized to provide the required deformation capability. By carefully controlling these parameters during manufacturing, the design achieves the desired balance between space reduction and manufacturability, allowing the shoulder portion to deform predictably during operation.
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 effectively prevents voltage arcing between the interface and operating end, reducing the overall size of the switch by approximately 66% and simplifying installation and replacement, while maintaining voltage withstand capability.
Implementation Method 1
the first tubular portion of the diaphragm is frictionally engaged with an inside of the tubular housing
Implementation Method 2
the second tubular portion is frictionally engaged with the operating rod
Implementation Method 3
a diaphragm positioned in the tubular housing between the interface and the operating end to prevent voltage from the interface from arcing to the operating end
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
An electrical switch includes a tubular housing that includes an interface positioned intermediate the conductor receiving end and the operating end. An operating rod extends through the housing. A fixed contact is electrically coupled to the operating end. A moveable contact is electrically coupled to the interface and the operating rod, wherein the moveable contact is moveable between a first position contacting the fixed contact and a second position separated from the fixed contact. A diaphragm is positioned in the tubular housing between the interface and the operating end and includes a first tubular portion and a second tubular portion. Movement of the operating rod from the first position to the second position causes the second tubular portion to move relative to the first tubular portion, thus deforming the shoulder portion.