Arc Extinction Cage With Clipping Guide Slots
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Solution Overview
Problem
The manufacturing of electric arc extinguishing cages for electrical switching devices is complicated and not compatible with industrial automation requirements, making it difficult to efficiently produce and assemble these components.
Innovation Solution
The electric arc extinguishing cage features a stack of U-shaped sectioning plates with lateral guide slots and trapezoidal grooves and orifices in the insulating casing, allowing for precise guidance and easy clipping of the plates, enabling automated assembly and improved positioning, even if the insertion direction is not exact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If sectioning plates are inserted into the insulating envelope using traditional methods, then the assembly can be completed, but the manufacturing process is complicated and not compatible with industrial automation
Solution Approach 1:
The sectioning plates are pre-equipped with lateral guide slots and clipping protrusions before assembly. The insulating envelope is pre-formed with trapezoidal grooves and orifices in specific positions. These preliminary preparations enable the plates to be automatically guided and clipped into place during automated assembly, eliminating the need for complex manual positioning operations
Solution Approach 2:
The lateral guide slots in the sectioning plates and trapezoidal grooves in the insulating envelope act as intermediary guiding elements. These features mediate the insertion process by providing automatic alignment paths, allowing the clipping protrusion to follow the groove contours and orifices to engage at precise locations, thereby simplifying the overall assembly operation for automation
2Manufacturing precision
If traditional insertion methods are used for sectioning plates, then assembly can be completed, but positioning precision is difficult to achieve consistently
Solution Approach 1:
The insulating envelope is designed with localized trapezoidal grooves and orifices at specific positions rather than uniform features throughout. The grooves are positioned to match the exact insertion path required for precise plate positioning, while the orifices are located to provide clipping engagement at the correct depth and orientation. This localized feature distribution achieves high positioning precision without complicating the overall manufacturing process
Solution Approach 2:
The trapezoidal grooves feature asymmetric geometry with converging walls that guide the clipping protrusion from one side. The grooves are positioned asymmetrically relative to the envelope centerline, with specific orientations that direct the sectioning plates into their correct final positions. This asymmetric design provides self-aligning characteristics that ensure precise positioning during automated insertion
3Productivity
If sectioning plates are clipped inside the insulating envelope without guidance features, then the structure remains simple, but the clipping process is time-consuming and difficult to automate
Solution Approach 1:
The sectioning plates are pre-formed with lateral guide slots and clipping protrusions, and the insulating envelope is pre-formed with trapezoidal grooves and orifices. These preliminary structural preparations enable rapid automated clipping operations by providing built-in guidance and positioning features, eliminating the need for time-consuming manual alignment during assembly
Solution Approach 2:
The trapezoidal grooves and orifices serve as intermediary guiding structures that facilitate rapid clipping. The grooves provide a predefined path for the clipping protrusion to follow, while the orifices provide automatic engagement points. These intermediary features enable fast automated assembly without requiring complex external positioning mechanisms, thus improving productivity with minimal added structural complexity
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 configuration simplifies the manufacturing process, allowing for quick and easy clipping of the plates, resulting in precise guidance and automatic positioning, which enhances the automation of the assembly process and improves the overall efficiency of the arc extinguishing mechanism.
Implementation Method 1
electric arcs appear on the separation of a moving contact and a fixed contact
Implementation Method 2
a stack of so-called deionization sheets which divides the previously elongated arc until the voltage necessary for its maintenance is greater than that of the network
Data Source
Figure 1~4
Figure 5~10
Figure 11a~12
AI summary
Cage for extinguishing the electric arc created at the opening between a moving contact (15) and a fixed contact (6) of an electrical interrupter of at least one line of the circuit-breaker type, comprising a stack of arc-dividing laminations (2) inserted in the form of a fan in a casing (1) made of insulating material, each U-shaped lamination (2) then being oriented so as to be approximately perpendicular to the travel of the moving contact (15) pivoting between the branches (10, 10') of the U-shaped laminations. Housings located in the bottom of the casing and trapezoidal grooves/orifices located in the lateral faces of the casing make it possible, in cooperation with excrescences protruding laterally from the laminations, to clip-fasten said laminations in the casing.