Sealed Inner Chamber Structure for Plasma-Tight Arc Cut-Off
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Solution Overview
Problem
Existing pyrotechnic cut-off devices face challenges in maintaining a sealed internal chamber to prevent plasma exhaust during the breaking of a conductive bar, which can lead to inefficient electric arc cut-off performance.
Innovation Solution
A device with a sealed internal chamber is designed using a single-piece seal comprising at least two closed-loop portions and connection portions, ensuring continuous sealing around the through element and preventing plasma exhaust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing solution is used for the internal chamber, then the device structure becomes complex or the sealing reliability is insufficient, but the patent achieves reliable sealing with a simple single-piece seal structure
Solution Approach 1:
The seal is designed with multiple closed-loop portions (first closed-loop portion, second closed-loop portion, etc.) that segment the sealing function around the through element. Each closed-loop portion independently seals a specific region, and together they provide comprehensive sealing coverage. This segmentation allows the seal to maintain high reliability while keeping the overall structure simple and manageable.
Solution Approach 2:
The seal structure features nested closed-loops where smaller closed-loop portions are positioned within or between larger closed-loop portions. This nesting arrangement allows multiple sealing functions to be integrated into a single compact component, eliminating the need for separate sealing elements and reducing overall device complexity while maintaining reliable sealing.
2Reliability
If multiple separate sealing components are used to ensure continuous sealing, then the sealing effectiveness improves, but the device complexity and assembly difficulty increase
Solution Approach 1:
Multiple closed-loop portions and connection portions are merged into a single integrated seal component. This unified structure ensures continuous sealing around the through element without requiring assembly of multiple separate sealing parts. The single-piece design eliminates assembly steps, reduces the risk of assembly errors, and simplifies manufacturing while maintaining effective continuous sealing.
3Ease of manufacture
If the seal structure is simplified to reduce device complexity, then manufacturing becomes easier, but the sealing capability at the through element may be compromised
Solution Approach 1:
The seal design applies different structural features to different regions: closed-loop portions are positioned at critical sealing locations around the through element where sealing capability is most needed, while connection portions bridge these regions. This localized optimization ensures high sealing capability at critical points while maintaining overall manufacturing simplicity through the single-piece construction.
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 solution effectively prevents plasma exhaust and enhances electric arc cut-off performance by maintaining a sealed internal chamber, improving the device's ability to extinguish electric arcs quickly and efficiently without increasing the device's size or mass.
Implementation Method 1
a seal of the internal chamber surrounding the through element and ensuring a sealing along the latter
Implementation Method 2
the internal chamber can be filled with a dielectric gas whose breakdown voltage is greater than the breakdown voltage of air
Data Source
AI summary
The disclosure includes a sealed device having a seal around an internal chamber, the seal having at least two closed-loop portions through which a through element extends.