Relay Contact Assembly With Split Gaps for Arc and Heat Control
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Solution Overview
Problem
Existing relay technologies face difficulties in controlling contact parameters and manufacturing efficiency due to the temperature rise of movable contact pieces, which is exacerbated by multi-contact designs.
Innovation Solution
A contact part for a relay is designed with two sets of movable contact parts, where one set has a smaller contact gap for arc-resistant purposes and the other set has a larger gap for current-carrying, allowing for differential control and reduced temperature rise, with the arc-resistant end contact having fewer sets to enhance durability and ease of parameter measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multi-contact sets are designed to reduce temperature rise, then temperature control is improved, but manufacturing difficulty increases and production efficiency decreases
Solution Approach 1:
The contact part is divided into two distinct sets of contacts: arc-resistant contacts with smaller gaps and current-carrying contacts with larger gaps. This segmentation allows each set to be optimized for its specific function, reducing overall temperature rise while maintaining manufacturability through differentiated design requirements.
Solution Approach 2:
Different contact gap sizes are assigned to different contact sets based on their specific functions. The arc-resistant contacts have smaller gaps localized at positions where arc suppression is needed, while current-carrying contacts have larger gaps where current capacity is prioritized. This local differentiation improves temperature control without uniformly complicating the entire contact structure.
2Temperature
If multi-contact sets are designed to reduce temperature rise, then temperature control is improved, but control of contact parameters becomes difficult
Solution Approach 1:
By segmenting contacts into arc-resistant and current-carrying sets with clearly defined gap requirements, the parameter control task is divided into manageable subsets. Each set has specific gap tolerances that can be controlled independently during manufacturing, simplifying quality assurance compared to uniformly tight multi-contact specifications.
Solution Approach 2:
The invention applies different gap parameter values to different contact sets based on their functional requirements. Arc-resistant contacts use smaller gap parameters (0.1-0.5mm) while current-carrying contacts use larger gap parameters (0.5-1.0mm). This parameter differentiation makes control more straightforward by matching specification stringency to functional importance.
3Reliability
If arc-resistant contacts with smaller gap are used, then arc resistance is improved, but contact wear increases due to arcing
Solution Approach 1:
The contact system is segmented into arc-resistant contacts that handle switching operations and current-carrying contacts that handle continuous current flow. The arc-resistant contacts with smaller gaps suppress arc formation during switching, while the current-carrying contacts with larger gaps and parallel configurations handle thermal loads, collectively extending overall contact service life.
Solution Approach 2:
The current-carrying contacts act as intermediaries that bear the thermal burden, allowing the arc-resistant contacts to focus on their primary function of reliable switching. This functional mediation protects the arc-resistant contacts from excessive thermal stress while maintaining arc suppression capability.
Data Source
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AI summary
A contact part (20) for a relay includes two sets of movable contact parts (20a), each set of the movable contact parts (20a) including a movable contact piece (210), a movable contact unit (220) disposed on the movable contact piece (210), and a static contact unit (230), two movable contact units (220) of the contact part (20) corresponding to two static contact units (230) of the contact part (20), respectively. Wherein when the contact part (20) is in a disconnected state, a contact gap between the movable contact unit (220) and the static contact unit (230) corresponding to each other in one set is smaller than a contact gap between the movable contact unit (220) and the static contact unit (230) corresponding to each other in the other set.