Circuit Breaker Operating Mechanism for Main Shaft Rebound Blocking
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Solution Overview
Problem
Existing operating mechanisms in universal circuit breakers suffer from main shaft rebound issues, leading to arc re-ignition and continuous arcing phenomena, which can cause explosions.
Innovation Solution
An operating mechanism with a swinging member and a blocking member that uses an impacting member to quickly rotate the blocking portion away from the main shaft, ensuring the limiting shaft is on its path, preventing rebound, and utilizing an elastic member to return the blocking member to its original position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blocking member rotates by its own inertia to block the main shaft, then the structure is simple, but the reliability is poor and the blocking portion may not reach the limiting shaft in time to prevent rebound
Solution Approach 1:
The impacting member is pre-positioned to receive the impact force from the swinging member before the blocking portion reaches the limiting shaft. This preliminary action ensures that the blocking portion is actively pushed onto the limiting shaft at the correct moment, rather than relying on passive inertial rotation that may be insufficient to prevent rebound
Solution Approach 2:
The impacting member acts as an intermediary between the swinging member and the blocking portion. It receives the impact force and transmits it to the blocking portion, ensuring reliable transfer of energy to achieve the blocking action. This intermediary mechanism guarantees that the blocking portion reaches the limiting shaft with sufficient force to prevent rebound
2Reliability
If the blocking portion stays close to the main shaft to prevent rebound, then the limiting shaft is outside the path and rebound is prevented, but the impacting member may be damaged after multiple impacts
Solution Approach 1:
The impacting member is extracted from the main shaft's rotation path by positioning it such that the blocking portion rotates away from the main shaft after being pushed. This separation allows the impacting member to perform its function without being in the path of the main shaft, preventing damage from repeated impacts while maintaining reliable rebound prevention
Solution Approach 2:
The blocking portion is designed to rotate in a dimensional space that allows it to engage the limiting shaft for blocking, then rotate away to a safe position that is not in the path of the main shaft. This dimensional movement separates the blocking function from the potential damage zone, extending the service life of the impacting member
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
Prevents main shaft rebound, reducing the risk of arc re-ignition and continuous arcing, thereby enhancing the reliability and extending the service life of the impacting member.
Implementation Method 1
an elastic member connected to the blocking member are arranged on the swinging member... the elastic member is used for driving a blocking portion of the blocking member to rotate toward the main shaft
Implementation Method 2
the impacting member is used for pushing the blocking portion to overcome an acting force of the elastic member to rotate away from the main shaft
Data Source
AI summary
An operating mechanism includes a main shaft rotatably mounted on a side plate, and a swinging member arranged on the main shaft. The side plate has a limiting shaft blocking the rotation of the swinging member. A rotatable blocking member and an elastic member connected to the blocking member are arranged on the swinging member. The swinging member drives the blocking member to rotate around the main shaft. The elastic member drives a blocking portion of the blocking member to rotate toward the main shaft to locate, the limiting shaft outside a path of the blocking portion. An impacting member is inside the main shaft on the side plate and has two limiting portions arranged at intervals and in limiting fit with the main shaft. The impacting member pushes the blocking portion to rotate away from the main shaft to locate, the limiting shaft on the path of the blocking portion.