DC Contactor Arc Transfer Structure for Contact Life Extension
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Solution Overview
Problem
Existing direct-current contactors with sealed gas-filled arc extinguishing structures have complex structures and assembly processes, and the electric arcs generated during connection and disconnection reduce the service life of the contacts.
Innovation Solution
A direct-current contactor design that includes an arc introducing plate to transfer electric arcs to an arc extinguishing assembly, eliminating the need for a sealed gas-filled structure, and utilizing multiple arc extinguishing plates and a drive assembly for effective arc extinguishing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed gas-filled arc extinguishing structure is used, then arc extinguishing effectiveness is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent extracts the arc extinguishing function from the sealed gas-filled structure and implements it through an open-structure arc extinguishing assembly with arc extinguishing plates. The arc introducing plate transfers arcs to the arc extinguishing assembly, achieving effective arc extinguishing without requiring a sealed gas-filled structure, thus reducing device complexity while maintaining arc extinguishing effectiveness
Solution Approach 2:
The patent changes the physical state and configuration of the arc extinguishing mechanism from a sealed gas-filled environment to an open structure with arc extinguishing plates arranged in specific patterns. This parameter change allows arcs to be extinguished through the physical arrangement of plates rather than through a sealed gas environment, simplifying the overall structure
2Reliability
If a sealed gas-filled arc extinguishing structure is used, then arc extinguishing effectiveness is improved, but assembly process complexity increases
Solution Approach 1:
The patent segments the arc extinguishing function into separate components: an arc introducing plate and an arc extinguishing assembly with multiple arc extinguishing plates. This segmentation allows for simpler assembly where components can be independently manufactured and then assembled together, reducing assembly process complexity compared to manufacturing a complete sealed gas-filled structure
Solution Approach 2:
The patent extracts the arc extinguishing function from the sealed structure and implements it through separate arc extinguishing plates that can be independently assembled. The arc introducing plate is separately configured to transfer arcs to the extinguishing assembly, enabling modular assembly that simplifies the manufacturing process
3Device complexity
If electric arcs are not managed, then contactor structure is simpler, but contact service life decreases due to arc burning
Solution Approach 1:
The patent introduces an arc introducing plate as an intermediary component that transfers electric arcs from the contact point to the arc extinguishing assembly. This intermediary structure protects the contacts from direct arc exposure, extending contact service life while maintaining a relatively simple overall contactor structure without sealed gas-filled components
Solution Approach 2:
The patent converts the harmful effect of electric arcs into a controlled process by using the arc introducing plate to direct arcs to specific arc extinguishing plates. This transforms the destructive arc energy into a controlled phenomenon that can be effectively managed and dissipated, protecting the contacts while maintaining structural simplicity
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 design prolongs the service life of the contactor by effectively extinguishing arcs without a gas-filled structure, simplifying the assembly process and maintaining stable conduction performance.
Implementation Method 1
an electric arc is generated between the stationary contact and the moving contact when a current passes
Implementation Method 2
the arc introducing plate introduces the electric arc into the arc extinguishing assembly to perform arc extinguishing
Data Source
AI summary
A direct-current contactor includes a contact assembly, an arc extinguishing assembly, and a drive assembly. The arc extinguishing assembly is disposed around the contact assembly. The contact assembly includes a moving contact mechanism and a stationary contact mechanism that are disposed in pairs. The moving contact mechanism includes a moving contact. The stationary contact mechanism includes a stationary contact and an arc introducing plate disposed around the stationary contact. The arc introducing plate is configured to introduce an electric arc generated between the moving contact mechanism and the stationary contact mechanism into the arc extinguishing assembly. The drive assembly is configured to drive a connection or a disconnection of the moving contact and the stationary contact.