Double-Moving-Contact Spring Leaf Automatic Balance Apparatus
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Solution Overview
Problem
Conventional ground fault circuit interrupters (GFCI) and arc fault circuit interrupters (AFCI) with simple spring leaf lifting devices often fail to ensure reliable contact between moving and stationary contacts, leading to shortened service life due to poor contact maintenance.
Innovation Solution
An automatic balance apparatus with a double-moving-contact spring leaf in a socket, featuring a lifting slide block with a balance warped plate and protruding portions, a rotary support shaft, and independently swinging moving contact arms, ensures proper alignment and contact between moving and stationary contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple lifting slide block structure is used, then device complexity is reduced, but contact reliability deteriorates because the lifting arm cannot ensure both moving contacts are in good contact with stationary contacts
Solution Approach 1:
The patent introduces a balance warped plate that can rotate dynamically around a rotary support shaft. This dynamic structure allows the spring leaf to automatically adjust its position during the lifting process, ensuring both moving contacts maintain good contact with stationary contacts. The rotation capability enables the system to adapt to position changes and maintain reliable contact throughout the lifting operation.
Solution Approach 2:
The balance warped plate with protruding portions automatically levels the spring leaf during the lifting process without requiring external intervention. The structure self-adjusts through the rotation of the warped plate around the rotary support shaft, ensuring both contacts are properly positioned. This self-leveling mechanism eliminates the need for complex external control systems.
2Manufacturing precision
If a simple lifting arm structure is used, then manufacturing precision requirements are reduced, but contact consistency worsens leading to shortened service life
Solution Approach 1:
The balance warped plate provides dynamic adjustment capability that compensates for manufacturing tolerances. During lifting, the warped plate rotates to automatically level the spring leaf, ensuring consistent contact positioning even when manufacturing precision varies. This dynamic compensation extends the service life of contacts by maintaining reliable contact throughout the product lifecycle.
Solution Approach 2:
The balance warped plate changes its angular parameter (rotation angle around the rotary support shaft) to achieve proper contact alignment. This parameter change allows the system to adapt to different lifting positions and maintain optimal contact conditions, thereby extending service life without requiring extremely tight manufacturing tolerances.
Data Source
AI summary
The utility model discloses an automatic balance apparatus with a double-moving-contact spring leaf in a socket, which may ensure that two moving contacts are in good contact with corresponding stationary contacts. The automatic balance apparatus includes a lifting slide block, where the lifting slide block is provided with a lifting base below the spring leaf, a balance warped plate corresponding to an arrangement direction of moving contacts is movably disposed in the lifting base, and upward protruding portions are respectively disposed on two sides of the top surface of the balance warped plate. The utility model is particularly applicable to various ground fault circuit interrupters (GFCIs) and arc fault circuit interrupters (AFCIs).