Eccentric Contact Support for Isolation Switch Speed
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Solution Overview
Problem
Traditional rotary isolation switches have a limited structure that restricts the speed of the moving contact assembly, hindering the optimization of the isolation switch's performance.
Innovation Solution
The contact unit incorporates a housing with a swing limiting groove and a swing supporting portion that rolls along the groove side wall, allowing the contact support to rotate eccentrically and achieve a greater linear velocity of the moving contact assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the moving contact assembly rotates coaxially with the operating mechanism, then the structure is simple, but the moving speed of the moving contact assembly reaches a bottleneck state and cannot be improved
Solution Approach 1:
The patent introduces an eccentric structure where the contact support rotates around an eccentric axis rather than a coaxial axis. The swing supporting portion with equal-width curve contour line and the swing limiting groove create an asymmetric motion path, transforming the rotational motion into a combination of rotation and translation, thereby increasing the linear velocity of the moving contact assembly without significantly complicating the overall structure
Solution Approach 2:
The patent adds a dimensional element by introducing radial movement through the swing supporting portion rolling along the swing limiting groove. This converts the single-dimensional rotational motion into a two-dimensional compound motion, allowing the moving contact assembly to achieve higher speeds by utilizing both rotational and radial components of motion
2Reliability
If the moving contact assembly rotates coaxially with the operating mechanism, then the structure is limited, but the performance optimization of the isolation switch is hindered
Solution Approach 1:
The patent transforms the static coaxial rotation structure into a dynamic eccentric rotation structure. The contact support rotates around an eccentric axis, creating dynamic motion characteristics that allow for variable speed and improved performance. This dynamic structure enables better adaptation to different operational requirements while maintaining reliability through the constrained motion path defined by the swing limiting groove
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 design enhances the moving speed of the moving contact assembly, improving the performance of the isolation switch while maintaining high reliability and a simple structure.
Implementation Method 1
a swing supporting portion is arranged at a central position of the contact support in a protruding manner; the swing supporting portion rolls along a side wall of the swing limiting groove
Data Source
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AI summary
Disclosed are a contact unit and an isolation switch. The contact unit includes a housing and a contact mechanism arranged in the housing. The contact mechanism includes a moving contact assembly and a pair of static contact assemblies. The moving contact assembly includes a contact support. The contact support is provided with a pair of moving contact portions. The moving contact portion is driven by the contact support to correspondingly match the static contact portion of the static contact assembly. The housing is provided with a swing limiting groove. A rotary supporting portion is arranged at a central position of the contact support in a protruding manner. The swing supporting portion rolls along a side wall of the swing limiting groove. A rolling surface contour line of the swing supporting portion is an equal-width curve. The swing supporting portion in the present invention rolls along the swing limiting groove respectively so that a movement trajectory is longer, so that the contact support obtains a larger linear velocity.