DC Contactor Vent Pathways for Faster Vacuum Evacuation
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Solution Overview
Problem
Conventional DC contactors have restricted vacuum pathways, leading to slow evacuation times and higher residual oxygen and water vapor, which cause contact resistance increases and heat generation due to oxidation of copper elements.
Innovation Solution
Incorporating strategically placed vent pathways in key components such as the arc shield, shaft assembly, and upper static core to enhance vacuum flow rates and reduce contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional restricted vacuum pathways are used in DC contactors, then the structural design is simpler, but the evacuation time is longer and residual oxygen and water vapor levels are higher
Solution Approach 1:
The vacuum pathway is segmented into multiple separate vent pathways distributed across different components (arc shield, shaft assembly, upper static core) rather than using a single restricted pathway. This segmentation increases the total cross-sectional area for vacuum flow, reducing evacuation time while maintaining manageable structural complexity through modular component design
Solution Approach 2:
Vent pathways are incorporated in multiple spatial dimensions and locations throughout the contactor assembly. By adding pathways in different orientations and positions (in the arc shield, shaft assembly, and upper static core), the vacuum evacuation occurs through a three-dimensional network rather than a single linear pathway, significantly improving evacuation speed
2Reliability
If conventional vacuum pathways are used, then the manufacturing process is simpler, but the residual oxygen and water vapor cause contact resistance increases and heat generation
Solution Approach 1:
The vent pathway system is segmented across multiple components that are manufactured separately and then assembled. Each component (arc shield, shaft assembly, upper static core) can be manufactured using standard processes, and the vent pathways are integrated into these components during assembly, maintaining ease of manufacture while achieving the reliability benefits of improved vacuum evacuation
Solution Approach 2:
The vent pathways serve multiple functions: they facilitate vacuum evacuation, provide oxidation protection for copper elements, and maintain long-term contact resistance stability. By incorporating these pathways into standard contactor components, the design achieves multi-functionality without requiring separate dedicated structures, preserving ease of manufacture
3Productivity
If faster evacuation is achieved through improved pathways, then manufacturing costs are reduced, but the component design becomes more complex
Solution Approach 1:
The evacuation system is segmented into multiple parallel vent pathways in different components, increasing total flow capacity and evacuation speed. Each segmented pathway can be implemented using existing component designs and manufacturing capabilities, limiting the increase in overall device complexity while achieving improved productivity
Solution Approach 2:
The design changes physical parameters of the vacuum pathways (increasing cross-sectional area, reducing flow resistance) rather than fundamentally altering component architectures. By modifying pathway dimensions and configurations within existing components, evacuation speed is improved without requiring completely new component designs, thus limiting complexity increases
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 improved evacuation air pathways accelerate the vacuum evacuation process, reducing manufacturing costs and maintaining low contact resistance and heat generation over the product's life.
Implementation Method 1
the internal chamber of the contactor is evacuated, removing air and water vapor to create a sealed environment
Data Source
Figure 1A
Figure 1B
Figure 2A
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.