DC Contactor Venting Layout for Faster Evacuation and Low Resistance
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Solution Overview
Problem
Conventional DC contactors face challenges in rapid evacuation of air and moisture, leading to prolonged manufacturing times and higher residual gas levels, which can cause oxidation and increase contact resistance.
Innovation Solution
The implementation of strategically placed vent pathways in key components such as the arc shield, shaft assembly, and upper static core facilitates faster and more complete evacuation of air and moisture, optimizing vacuum flow rates and reducing contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional air pathways are used in DC contactor components, then the structure remains simple, but the evacuation speed is slow and manufacturing time is prolonged
Solution Approach 1:
The air pathway is segmented into multiple separate vent pathways distributed across different components (arc shield, shaft assembly, upper static core) rather than using a single pathway. This segmentation increases the total evacuation area and speed while maintaining individual component simplicity.
Solution Approach 2:
Vent pathways are implemented in multiple spatial dimensions and locations throughout the contactor assembly. By adding pathways in different components and orientations, the evacuation process occurs simultaneously across multiple dimensions, dramatically increasing overall evacuation speed without making any single component overly complex.
2Reliability
If conventional air pathways are used, then manufacturing costs are lower, but residual gas levels remain high causing oxidation and increased contact resistance
Solution Approach 1:
Multiple vent pathways are distributed across different components to ensure complete evacuation of all air pockets and residual gases throughout the contactor. This comprehensive evacuation prevents oxidation and maintains low contact resistance, improving reliability without requiring expensive materials or post-processing.
Solution Approach 2:
By achieving thorough evacuation of air and moisture through multiple vent pathways, the contactor interior is prepared for filling with inert gas (nitrogen or sulfur hexafluoride). This creates an inert atmosphere that prevents oxidation of contacts, ensuring long-term reliability and stable contact resistance.
3Productivity
If evacuation is not optimized, then manufacturing process is simpler, but manufacturing time is prolonged
Solution Approach 1:
The evacuation system is segmented into multiple parallel vent pathways that operate simultaneously, allowing air and moisture to be evacuated from different regions of the contactor at the same time. This parallel processing dramatically reduces total evacuation time and increases manufacturing productivity.
Solution Approach 2:
Vent pathways are pre-integrated into the component designs (arc shield, shaft assembly, upper static core) before final assembly. This preliminary incorporation of evacuation pathways eliminates the need for complex post-assembly modifications and streamlines the manufacturing process, reducing overall manufacturing time.
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 design improvement accelerates the evacuation process, reducing manufacturing costs and enhancing the efficiency and longevity of the DC contactor by minimizing heat generation and maintaining low contact resistance.
Implementation Method 1
the interior chamber of the contactor is evacuated, removing air and water vapor to create a sealed environment
Data Source
AI summary
In a particular embodiment, a DC contactor with improved evacuation air pathways is described that includes a weld plate having a port. The contactor also includes an arc chamber and a plunger tube with a cavity that is interconnected to the port and the arc chamber by air pathways. In this embodiment, the contactor also includes an upper static core disposed at least partially within the plunger tube and a shaft assembly coupled to a shaft disposed within the upper static core. The contactor also includes an arc shield within the arc chamber and one or more vent pathways in one or more of the arc shield, the shaft assembly, or the upper static core. In this embodiment, the one or more vent pathways in the air pathways interconnect the port, the arc chamber, and the plunger tube.