Movable Contact Terminal Buffer Structure for Stable Cable Coupling
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Solution Overview
Problem
Existing breakers face challenges in easily, stably, and reliably coupling cables to external components due to the flexibility of materials used, leading to potential damage and deformation during abnormal current conditions.
Innovation Solution
A movable contact part with a movable terminal and cable design featuring an insertion space and buffer space, allowing for easy and stable coupling by accommodating the cable and minimizing deformation through a larger cross-sectional area and external force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cables are coupled to external components using flexible materials, then ease of connection is improved, but stability and reliability of the coupling deteriorate due to material flexibility causing deformation and arbitrary separation
Solution Approach 1:
The movable terminal is divided into a body portion and a pressing portion that can be elastically deformed. This segmentation allows the pressing portion to be inserted into the cable coupling groove first, then elastically press the cable against the groove wall, achieving both easy insertion and stable coupling without requiring complex fastening mechanisms.
Solution Approach 2:
The pressing portion is designed with elastic properties that allow it to change its physical state from a relaxed state (for easy insertion) to a pressed state (for stable coupling). When the pressing portion is elastically deformed, it presses the cable against the groove wall with sufficient force to prevent arbitrary separation, while maintaining ease of initial coupling.
2Strength
If the movable terminal is pressed to couple with the cable, then coupling strength is improved, but deformation of the terminal occurs
Solution Approach 1:
The deformation issue is isolated to a specific component - the pressing portion - rather than affecting the entire movable terminal. The pressing portion is designed as a separate elastic element that absorbs the deformation, while the body portion maintains its structural integrity and shape for continued operation.
Solution Approach 2:
The elastic pressing portion acts as a cushioning element that anticipates and absorbs the deformation that would otherwise occur in the rigid terminal body. By designing the pressing portion with elastic properties beforehand, the terminal can be pressed firmly against the cable without causing permanent deformation to the overall terminal structure.
3Volume of moving object
If the cable coupling groove has a small cross-sectional area, then the terminal size is reduced, but the cable cannot be easily inserted
Solution Approach 1:
The pressing portion is designed to be elastically deformed during the insertion process. Before the cable is fully inserted, the pressing portion is in a relaxed state with a larger effective opening. As the cable is inserted, the pressing portion naturally deforms to conform to the cable, allowing easy insertion without requiring excessive force or a large initial opening.
Solution Approach 2:
The coupling groove is not a static rigid structure but includes the elastic pressing portion that dynamically changes its shape during insertion and coupling. The groove transitions from a more open state (allowing easy cable insertion) to a compressed state (providing strong coupling), enabling both small overall size and ease of operation.
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
The design enables easy, stable, and reliable coupling of cables to external components, preventing deformation and maintaining the coupled state, while allowing for various modifications in shape and application.
Implementation Method 1
one end of the movable terminal is pressed toward the insertion space and the buffer space is reduced when an external force is applied to the movable terminal
Data Source
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AI summary
Disclosed are a movable contact part and a breaker including the same. A movable contact part according to one aspect of the present disclosure may include: a movable terminal conductively connected to an external power source or an external load; a movable cable coupled and electrically connected to the movable terminal and extending to the outside of the movable terminal; and a movable contact bar coupled and electrically connected to the movable cable and configured to be rotatable, in which the movable terminal includes: an insertion space formed through the inside of the movable terminal and configured to accommodate the movable cable; and a buffer space formed through the inside of the movable terminal, configured to communicate with the insertion space, and positioned between the insertion space and one end of the movable terminal based on a longitudinal direction, and in which one end of the movable terminal is pressed toward the insertion space and the buffer space is reduced when an external force is applied to the movable terminal.