DC Isolating Switch Cam Structure for Fast Arc Extinction
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Solution Overview
Problem
Conventional DC isolating switches face issues with arc extinction, leading to high impact forces that cause cam deflection and potential fracture, reducing the service life due to the need for quick arc extinguishing.
Innovation Solution
The DC isolating switch incorporates a rotating cam with an arc groove and a first rotating shaft within the groove, sharing counter-impact forces to reduce stress on the second rotating shaft, and an actuating mechanism with a groove and protrusion to stabilize the cam during operation, preventing deflection and fracture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the elasticity of the elastic part is set large to quickly extinguish the arc, then the arc extinction speed is improved, but the cam is subjected to large impact force causing deflection and potential fracture of the cam shaft
Solution Approach 1:
The patent divides the force transmission path by introducing a groove structure on the cam that interacts with the rotating shaft. This segmentation allows the counter-impact force to be distributed to different portions of the rotating shaft during rotation, preventing concentration of force on the cam shaft and reducing fracture risk while maintaining quick arc extinction capability
Solution Approach 2:
The groove structure on the cam acts as an intermediary element between the cam and the rotating shaft. During cam rotation, the groove wall contacts different portions of the rotating shaft, mediating the transmission of counter-impact force and distributing it along the rotation path, thereby protecting the cam shaft from excessive localized stress
Data Source
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AI summary
Embodiments of the present disclosure provide a DC isolating switch comprising an operating mechanism, the operating mechanism comprising an operating handle and a first rotating shaft, the operating handle being disposed on the first rotating shaft and rotating around the first rotating shaft; and a cam comprising a main portion and a second rotating shaft, the main portion being disposed on the second rotating shaft and capable of rotating around the second rotating shaft, wherein a side of the main portion facing the operating mechanism is provided with an arc groove, a part of the first rotating shaft is disposed within the arc groove, and in a case that the main portion rotates around the second rotating shaft, different portions of a groove wall of the arc groove contact the first rotating shaft.