Vacuum Interrupter Cam Linkage Using Rolling Guides
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Solution Overview
Problem
Existing mechanisms for transmitting motion from a driving cam to the contact rod of a vacuum interrupter in power diverter switches are unreliable due to sliding friction, complex structure, and high manufacturing accuracy requirements, which are exacerbated by the presence of hinges and sliding guiders, leading to wear and performance degradation at low temperatures.
Innovation Solution
A system utilizing a main driving shaft coupled to a control cam, with a transmission unit comprising rollable guiding elements and a hingeless lever mechanism, including rolling bearings, to securely transmit force to the contact rod, ensuring reliable contact separation through rolling friction and a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sliding guiders and auxiliary levers with hinges are used to transmit motion from cam to contact rod, then the mechanism can be implemented with conventional design, but the reliability deteriorates due to sliding friction and wear
Solution Approach 1:
The patent replaces sliding friction-based mechanical elements with rolling friction-based elements. Specifically, sliding guiders are replaced with rolling guiders that utilize rolling elements (such as ball bearings or rollers) to transmit motion, and auxiliary levers with hinges are replaced with hingeless lever mechanisms. This substitution converts harmful sliding friction into beneficial rolling friction, significantly reducing wear and improving reliability of the motion transmission system from cam to contact rod.
2Ease of operation
If a plurality of elements are used in the dimensional chain between cam and contact rod, then the mechanism can achieve the required motion, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary elements from the motion transmission chain. By removing auxiliary levers with hinges and sliding guiders, the design reduces the number of components in the dimensional chain between cam and contact rod. The rolling guider and hingeless lever mechanism provide the required motion transmission with fewer elements, simplifying the overall device structure while maintaining operational effectiveness.
Solution Approach 2:
The patent merges multiple functions into fewer components. The rolling guider simultaneously provides motion guidance and force transmission that previously required separate sliding guider and auxiliary lever elements. The hingeless lever mechanism combines the functions of motion transmission and structural support that were previously distributed across multiple hinged elements, thereby reducing device complexity.
3Ease of manufacture
If sliding guiders and hinges are used in the mechanism, then the structure can be implemented with conventional components, but manufacturing precision requirements increase due to the dimensional chain
Solution Approach 1:
The patent replaces sliding friction-based components with rolling friction-based components, which have more favorable manufacturing characteristics. Rolling elements such as ball bearings and rollers are standard components with well-established manufacturing processes and tolerances. The rolling guider and hingeless lever mechanism reduce the cumulative effect of manufacturing tolerances in the dimensional chain, lowering overall precision requirements compared to conventional sliding and hinged mechanisms.
4Ease of operation
If hinges are implemented in the mechanism, then the structure can achieve required motion, but the performance deteriorates at low temperatures
Solution Approach 1:
The patent extracts and eliminates hinges from the mechanism, replacing them with hingeless lever mechanisms. Hinges suffer from performance degradation at low temperatures due to increased friction and potential seizing of moving parts. By removing hinges entirely and using a hingeless design with rolling elements, the mechanism maintains reliable motion transmission across a wide temperature range, including low temperature environments where conventional hinged mechanisms would fail.
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 system provides a stable, reliable, and space-saving mechanism for securely separating electrical contacts, reducing friction-related wear and manufacturing complexity, while maintaining performance across a wide temperature range, including low temperatures.
Implementation Method 1
The transmission unit comprises a plurality of rollable guiding elements and a lever mechanism which is in contact with the rollable guiding elements... causes a movement of the contact rod due to a guided movement of the lever mechanism by means of rolling of the guiding elements
Data Source
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AI summary
A system (1) for controlling a vacuum interrupter (30) for a power diverter switch comprises a main driving shaft (10) which is configured to drive the control cam (13). The system (1) further comprises the vacuum interrupter (30) which is configured to separate electrical contacts in a vacuum by use of a contact rod (31), and a transmission unit (20) which is configured to transmit the force generated by the main driving shaft (10) to the contact rod (31). The transmission unit (20) comprises a plurality of rollable guiding elements (25) and a lever mechanism (21, 22, 23, 24) which is coupled to both the control cam (13) and the contact rod (31) of the vacuum interrupter (30) such that a rotation of the control cam (13) generated by the main driving shaft (10) causes a movement of the contact rod (31) due to a guided movement of the lever mechanism (21, 22, 23, 24) by means of rolling of the guiding elements (25).