Movable Contact Module With Insulated Creepage Path Detection
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Solution Overview
Problem
Existing contactor designs fail to meet high-voltage insulation requirements due to a short creepage distance between the movable contact and the drive shaft, and there is uncertainty in determining the position of the movable contact due to overtravel issues, affecting safety and reliability.
Innovation Solution
A movable contact module with an insulating member and a movable contact, where the insulating member includes a through hole and a peripheral wall that increases the creepage distance between the drive shaft and the movable contact, and an auxiliary switch pressing portion is integrated to enhance position determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive shaft is directly connected to the movable contact, then the device complexity is reduced, but the creepage distance between the movable contact and drive shaft becomes short, failing to meet high-voltage isolation requirements
Solution Approach 1:
The patent introduces an insulating member as an intermediary component between the drive shaft and the movable contact. This insulating member includes an insulating body with a through hole that allows the drive shaft to pass through, while the movable contact is surrounded by the insulating body. This mediator structure achieves both electrical isolation for high-voltage applications and maintains a relatively simple overall structure.
2Measurement precision
If an auxiliary switch is added to detect the movable contact state, then the measurement precision of contact position is improved, but the device complexity increases due to additional components and overtravel mechanisms
Solution Approach 1:
The patent combines the auxiliary switch pressing portion with the insulating member as an integrated structure. The auxiliary switch pressing portion is formed as part of the insulating member body, eliminating the need for separate auxiliary switch components and reducing overall device complexity while maintaining accurate contact position detection functionality.
3Reliability
If the insulating member includes a peripheral wall protruding from the insulating body, then the creepage distance between the drive shaft and movable contact is increased, but the manufacturing precision requirements are heightened
Solution Approach 1:
The peripheral wall structure is pre-integrated into the insulating member design, with the protruding peripheral wall forming part of the molded insulating body. This preliminary structuring ensures the creepage distance is built-in during manufacturing, and the through hole position is pre-determined in the molding process, reducing the need for post-manufacturing adjustments.
Data Source
AI summary
A movable contact module for a contactor comprises an insulating member and a movable contact. The insulating member includes an insulating body having a through hole penetrating therethrough, and a peripheral wall protruding from the insulating body and surrounding an opening of the through hole. The movable contact has a fixed portion fixed in the insulating body, and an exposed portion exposed from the insulating body. The fixed portion of the movable contact is surrounded by the insulating body so that the movable contact is electrically isolated from a drive shaft passing through the through hole. The peripheral wall of the insulating member increases a creepage distance between the drive shaft passing through the through hole and the exposed portion of the movable contact.