DC Contactor Sealing Structure for Clean Arc Chambers
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Solution Overview
Problem
Existing DC contactors suffer from contamination of silver alloy layers on contact points due to external pollutants entering the arc extinguishing chamber through gaps between the upper and lower shells, leading to reduced electrical contact performance.
Innovation Solution
Incorporation of a sealing element, such as a sealing element or sealing ring, between the upper and lower shells to form a seal and prevent external pollutants from entering the arc extinguishing chamber, combined with the use of sealing glue in terminal gaps to enhance sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper and lower shells are assembled together without a sealing element, then the device complexity is reduced, but external pollutants can enter the arc extinguishing chamber and contaminate the silver alloy layer
Solution Approach 1:
A sealing ring made of elastic material is installed in a sealing groove between the upper and lower shells. The elastic sealing ring deforms to fill gaps and create an effective seal, preventing pollutant ingress while maintaining structural simplicity. This flexible sealing approach resolves the contradiction by providing reliable sealing without complex mechanical structures.
2Object-affected harmful factors
If a sealing element is added between the upper and lower shells, then pollutant ingress is prevented, but the device complexity increases
Solution Approach 1:
A sealing ring acts as an intermediary element between the upper and lower shells. This sealing ring is installed in a sealing groove and creates a barrier that prevents pollutants from entering the arc extinguishing chamber. The intermediary sealing element effectively blocks harmful factors while adding minimal structural complexity.
3Object-affected harmful factors
If the gap between upper and lower shells is reduced, then sealing performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The elastic sealing ring compensates for dimensional variations and manufacturing tolerances in the gap between upper and lower shells. The flexibility of the sealing ring allows it to deform and create an effective seal even with moderate gap variations, thereby reducing the stringency of manufacturing precision requirements while maintaining sealing performance.
Data Source
AI summary
A DC contactor includes an insulation shell including an upper shell and a lower shell, a static contact fixed to the upper shell and having a static contact point inside the upper shell, a movable contact movably disposed inside the upper shell and having a movable contact point electrically contacting the static contact point, and a sealing element positioned between and forming a seal between the upper shell and the lower shell.