Electric Switch Arc-Blasting Unit with Integrated Blowpipe
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Solution Overview
Problem
Existing electric switches at medium or high voltages face challenges with persistent electric arcs during contact separation, which are difficult to extinguish reliably, especially in gas-impervious enclosures due to the toxicity and environmental impact of SF6 gas, and require complex and costly arc-blasting systems.
Innovation Solution
A compact arc-blasting unit with a stationary piston and a mobile enclosure creates a focused gas flow to extinguish arcs efficiently by directing the gas flow precisely to the arc location using a blowpipe and nozzle arrangement, allowing for a more efficient energy use and simpler design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional arc-blasting system with mobile piston and separate chamber is used, then arc extinction capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent combines the compression chamber, piston, and blowpipe into a single integrated arc-blasting unit. The compression chamber is formed within the blowpipe structure itself, eliminating the need for separate compression chambers and reducing the number of moving parts. This merging of functions maintains arc extinction capability while significantly simplifying the overall system structure and reducing complexity.
Solution Approach 2:
The blowpipe serves multiple functions: it acts as the compression chamber boundary, contains the piston, directs the gas flow through its geometry, and positions the nozzle for arc targeting. This multi-functionality reduces the number of separate components needed, thereby simplifying the system while maintaining effective arc blasting capability.
2Reliability
If SF6 gas is used for arc extinction, then arc extinguishing efficiency is improved, but environmental harm and safety risks increase
Solution Approach 1:
The patent changes the parameter of gas composition by using alternative gases or gas mixtures (such as nitrogen, air, or SF6 alternatives) instead of pure SF6. By adjusting the gas composition parameters and optimizing the compression ratio and flow dynamics, the system maintains effective arc extinction capability while reducing the environmental harm and toxicity associated with SF6 gas.
3Reliability
If gas flow is released early in the contacts cavity, then arc blasting is achieved, but energy is wasted due to premature spreading
Solution Approach 1:
The compression chamber is positioned and configured so that gas compression and flow direction are prepared in advance. The piston compresses the gas within the blowpipe structure, and the nozzle is pre-positioned to direct the flow precisely at the contact separation point. This preliminary preparation ensures that the gas flow is released at the optimal moment and location, preventing premature spreading and maximizing energy utilization for arc blasting.
Solution Approach 2:
The blowpipe structure creates a localized compression zone within its walls, concentrating the gas flow in a specific direction toward the contact separation point. The nozzle geometry and blowpipe positioning ensure that the gas flow energy is focused locally at the arc location rather than dispersing broadly in the contacts cavity, thereby reducing energy waste while maintaining effective arc extinction.
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 extinguishes arcs with high efficiency and compactness, reducing the need for expensive SF6 gas and minimizing environmental impact while maintaining reliable arc extinction across multiple phases with a single enclosure and piston.
Implementation Method 1
a compression chamber, which communicates with the nozzle, being defined by the enclosure, the piston, and the blowpipe
Implementation Method 2
a gas flow extinguishing the arcs is created during the separation of the contacts
Data Source
AI summary
Embodiments of the disclosure relate to an electric switching unit provided with an arc-blasting unit. In one embodiment, an electric switch can be provided. This electric switch can include an arc-blasting unit with a compression cylinder enclosing a compression chamber mobile together with the mobile contacts, and a stationary piston at an end of the compression chamber, provided with a support rod made up as a blowpipe which channels the gas compressed in the chamber when the contacts separate to a nozzle that directs the flow to a separation place of the contacts so as to efficiently blast electric arcs. The arrangement can be relatively lightweight and can occupy relatively little space.