Circuit Breaker Trip Device Gap Adjustment Mechanism
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Solution Overview
Problem
Conventional circuit breakers face reliability issues due to assembly errors, which cause a scatter diagram of overcurrent and deteriorate trip operation reliability when trying to implement both thermal adjustable and thermal fixable types using the same components.
Innovation Solution
A trip device with a rotatable crossbar and bimetal that uses a gap adjustment member, which can be attached and detached at varying angles to adjust or maintain the gap between contact surfaces, ensuring consistent performance regardless of crossbar position, thus addressing both thermal adjustable and thermal fixable type requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same components (crossbar and bimetal) are used for both thermal adjustable and thermal fixable circuit breakers, then component commonality is improved, but assembly errors cause scatter in overcurrent characteristics and deteriorate trip operation reliability
Solution Approach 1:
The crossbar is designed to be movable in the direction of the rotating shaft, allowing dynamic adjustment of the gap between the bimetal and crossbar. This dynamic positioning capability enables the same component to adapt to different assembly variations while maintaining reliable trip operation, resolving the contradiction between component commonality and trip reliability.
Solution Approach 2:
The gap between the bimetal and crossbar is made adjustable by moving the crossbar along the rotating shaft. This parameter change allows the system to compensate for assembly errors and maintain consistent trip characteristics across different circuit breaker configurations, enabling both thermal adjustable and thermal fixable types to use the same components reliably.
2Reliability
If the crossbar position is adjusted to compensate for assembly errors, then trip operation reliability is improved, but the device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The rotating shaft serves multiple functions: it supports the crossbar, enables gap adjustment through crossbar movement, and provides the rotational motion for trip operation. This multi-functionality allows reliability improvement through adjustment without adding separate complex adjustment mechanisms, resolving the contradiction between reliability and device complexity.
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
This solution minimizes the scatter diagram of overcurrent and enhances trip operation reliability by allowing adjustable or fixed rated current settings, reducing manufacturing costs and maintaining performance across different component assembly errors.
Implementation Method 1
bimetal that is curved upon the occurrence of an abnormal current and presses and rotates the crossbar
Data Source
AI summary
A trip device for a circuit breaker includes: a crossbar rotatably installed to perform the trigger function; and bimetal that is curved upon the occurrence of an abnormal current and presses and rotates the crossbar by means of a gap adjustment member. The crossbar is movable in the direction of a rotating shaft of the crossbar, and the gap adjustment member is attached to and detached from either the crossbar or the bimetal at varying angles so that a contact surface is parallel or at an angle to the direction of movement of the crossbar.