Mechanical Interlock Mechanism for Asynchronous Electrical Switching
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Solution Overview
Problem
Existing mechanical interlock mechanisms for electrical devices fail to efficiently coordinate the asynchronous operations of fast ground switches and isolating switches, leading to potential short circuit accidents and operational delays, compromising electrical safety and reliability.
Innovation Solution
A mechanical interlock mechanism comprising synchronous rotating first and second rotary elements with linked track sections, allowing the first linkage element to move while the second is stationary and vice versa, ensuring only one electrical device is connected while the other is disconnected, thereby controlling asynchronous connection or disconnection of electrical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical interlock mechanism is designed to ensure electrical safety by preventing simultaneous closed states of isolating switch and fast ground switch, then reliability is improved, but action delay increases due to the slow operation speed of isolating switches compared to fast ground switches
Solution Approach 1:
The interlock mechanism is divided into two independent but coordinated systems: one controlling the isolating switch and another controlling the fast ground switch. Each system has its own rotary element and linkage, allowing them to operate at different speeds while maintaining safety through the shared shaft connection that ensures proper sequencing without forcing synchronization of operation speeds.
Solution Approach 2:
The mechanism allows dynamic operation where the fast ground switch can close and open rapidly while the isolating switch operates slowly. The tracks are designed to accommodate different movement speeds and patterns, enabling the fast ground switch to complete multiple operations while the isolating switch remains stationary or moves slowly, thus reducing action delay while maintaining reliability.
2Reliability
If the isolating switch operates slowly to ensure mechanical stability, then reliability is improved, but productivity deteriorates due to inability to coordinate with fast operating ground switch
Solution Approach 1:
The mechanism separates the control of isolating switch and fast ground switch into independent linkage systems that can operate at different speeds. The fast ground switch linkage can move quickly along its track while the isolating switch linkage moves slowly along its track, allowing each to maintain its optimal operating speed and stability characteristics.
Solution Approach 2:
The shared shaft acts as an intermediary that coordinates between the two switches. It transmits rotational position information between the isolating switch control and fast ground switch control without requiring them to move at the same speed, enabling productivity improvement through flexible coordination while maintaining mechanical stability.
3Ease of operation
If the track design allows continuous movement for both linkage elements, then coordination is improved, but harmful factors increase due to risk of simultaneous closed states causing short circuit
Solution Approach 1:
The track design incorporates safety zones and interlocking geometry that prevent both linkage elements from being in the closed position simultaneously. The tracks are configured so that when one switch is closed, the mechanical geometry of the other track prevents its linkage from reaching the closed position, thereby preliminarily preventing the harmful short circuit condition before it can occur.
Solution Approach 2:
The tracks utilize curved paths that guide the linkage elements through controlled movement sequences. The curvature of the tracks ensures that the linkage elements follow specific trajectories that maintain safe separation between closed states, allowing smooth coordination while preventing simultaneous closure through geometric constraints rather than rigid mechanical blocking.
Data Source
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AI summary
The present invention provides a mechanical interlock mechanism for electrical devices, comprising: a first rotary element, with a first track disposed thereon; a second rotary element, with a second track disposed thereon; a first linkage element, one end thereof being capable of moving along the first track; and a second linkage element, one end thereof being capable of moving along the second track; wherein the first rotary element and the second rotary element can rotate synchronously about the same shaft; during synchronous rotation of the first rotary element and the second rotary element, the first linkage element passes a first section of the first track, the second linkage element passes a first section of the second track, and the first linkage element and the second linkage element are in different states. The mechanical interlock mechanism of the present invention is capable of controlling two electrical devices connected thereto to realize connection or disconnection asynchronously, ensuring the reliability of the interlock operation thereof while reducing the action delay.