Rotary Isolating Switch Assembly via Radial Mounting Grooves
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Solution Overview
Problem
Existing rotary isolation switches have complex installation processes due to the circular arc isolation portion, making them difficult to automate and increasing assembly costs.
Innovation Solution
A contact system with a moving contact assembly and static contact assemblies, featuring a rotatable arc isolation portion with a contact groove and mounting grooves, allowing for simplified assembly and automatic alignment of static and moving contact portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the arc isolation portion is completely circular, then the isolation switch can be widely used, but the installation process becomes complicated and cannot be automated
Solution Approach 1:
The circular arc isolation portion is segmented by introducing radial mounting grooves that divide the circle into multiple sectors. Each sector contains positioning notches that guide the static contact portions during assembly. This segmentation transforms the complex circular alignment into simple linear insertion along the radial grooves, enabling automated assembly while preserving the circular configuration's versatility.
2Manufacturing precision
If static contact portions need to be lifted and plugged into the arc isolation portion at an appropriate angle, then proper contact alignment is achieved, but the installation process becomes complicated
Solution Approach 1:
The mounting grooves and positioning notches are pre-formed on the arc isolation portion before assembly. These features preliminarily establish the correct angular positions and insertion paths for the static contact portions. During assembly, the static contact portions simply need to be inserted along the pre-defined radial grooves and engage with the pre-positioned notches, eliminating the need for complex angular alignment operations.
3Extent of automation
If mounting grooves with notches are added to the arc isolation portion, then automatic assembly is enabled, but the structural complexity increases
Solution Approach 1:
Instead of modifying the entire circular arc isolation portion extensively, the invention introduces localized mounting grooves and positioning notches only at specific radial positions where static contact portions need to be attached. This localized modification approach enables automatic assembly functionality while minimizing the increase in overall structural complexity, as the added features are confined to specific locations rather than distributed throughout the entire structure.
Data Source
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AI summary
Provided are a contact system, a contact unit and a circuit breaker. The contact system includes a moving contact assembly arranged in a shell and a pair of static contact assemblies. The moving contact assembly includes an arc isolation portion which is assembled rotatably. The arc isolation portion is provided with a contact groove inside. A pair of moving contact portions are arranged in the contact groove. Each static contact assembly includes a static contact portion which extends into the contact groove. The arc isolation portion rotates and drives the pair of moving contact portions to be in contact with or separated from the static moving portion in the contact groove. An edge of the arc isolation portion is also provided with a pair of mounting grooves which are communicated with the contact groove, and each mounting groove is at least reserved with a notch for the static contact portion to be placed at one end surface of the arc isolation portion. According to the present invention, when the contact system is assembled, the static contact portion of the static contact assembly is arranged correspondingly from the notch and can be placed in the contact groove at an appropriate angle without lifting the static contact portion, which simplifies the step of assembling the contact system, is convenient in operation, can achieve automatic assembly and is conducive to reducing the cost.