Arc-Stopping Screen Mechanism for Protective Switches
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Solution Overview
Problem
Existing arc breaking screen mechanisms in protective switch devices are complex and only activated during short-circuit events, failing to efficiently manage overload currents and requiring separate mechanisms for manual control, which complicates their operation.
Innovation Solution
A breaking device with a mobile arc breaking screen connected to a contact holder arm via an actuating rod, allowing the screen to move between rest and rolling positions in response to contact movements, simplifying operation and enabling effective arc breaking during both automatic tripping and manual control scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile arc breaking screen is used only during short-circuit events, then short-circuit breaking is effective, but the device cannot efficiently manage overload currents and requires separate mechanisms for manual control
Solution Approach 1:
The mobile arc breaking screen is designed to serve multiple functions: it breaks arcs during short-circuit events, manages overload currents, and operates during manual control scenarios. By connecting the screen to the contact holder arm via an actuating rod, a single mechanism performs what previously required separate systems, thereby reducing overall device complexity while expanding adaptability.
Solution Approach 2:
The invention merges the control of the mobile arc breaking screen with the contact holder arm movement. The actuating rod transmits motion from the contact holder arm to the screen, combining two previously independent functions (contact operation and screen deployment) into a unified mechanism, simplifying the overall system architecture.
2Reliability
If separate mechanisms are used for automatic tripping and manual control, then each function can be optimized, but the overall device complexity increases
Solution Approach 1:
The mobile arc breaking screen and its actuating rod connection serve as a universal mechanism that operates reliably in both automatic tripping and manual control scenarios. The screen responds to contact holder arm movement regardless of whether the movement is caused by automatic tripping or manual operation, eliminating the need for separate control mechanisms while maintaining reliability across all operating modes.
3Ease of operation
If the arc breaking screen is connected directly to the contact holder arm, then the operation is simplified, but the screen may not remain stationary when needed
Solution Approach 1:
The connection between the contact holder arm and the mobile arc breaking screen is designed to be dynamic rather than rigid. The actuating rod transmits motion only when the contact holder arm moves, allowing the screen to remain stationary when the arm is stationary. This dynamic connection simplifies operation while maintaining precise control, as the screen automatically follows arm movement without requiring additional actuation mechanisms.
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 enhances the operational simplicity and effectiveness of arc breaking, allowing for efficient current cutoff during both short-circuit and overload conditions, reducing complexity and improving the device's ability to manage various current intensities.
Implementation Method 1
the use of such a screen thus makes it possible to laminate the electric arc between the contacts and thus makes it possible to cut off the short-circuit electric current. In fact, screen breaking makes it possible to generate high arcing voltages regardless of the amplitude of the current to be broken.
Data Source
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AI summary
An arc-stopping screen device comprising, within a housing (1), at least one fixed contact (12) cooperating with a movable contact (11) carried by a contact arm (14) and an actuation device (10) for the movable contact (11). A movable arc-stopping screen (13) is actuated to occupy a rest position and a rolling position. The movable arc-stopping screen (13) is connected to the contact arm (14) by an actuating rod (20) such that the movement of the contact arm (14) causes the movement of the movable arc-stopping screen (13), the actuating rod (20) being connected respectively to the movable arc-stopping screen (13) and to the contact arm (14) by a second and third axis of rotation (Z2, Z3).