High-Capacity Relay Anti-Short Circuit Structure for Over-Stroke
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Solution Overview
Problem
The existing anti-short circuit structure for high-capacity relays faces a contradiction between over-stroke and magnetic air gap, where increased over-stroke leads to a larger magnetic air gap, compromising the anti-short circuit function.
Innovation Solution
The proposed anti-short circuit structure incorporates a shell assembly with a first magnetic conduction block and a second magnetic conduction block, where the position relationship between the two blocks remains unchanged during over-stroke, maintaining a consistent magnetic air gap and magnetic attraction force, thus resolving the contradiction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If over-stroke is increased to provide greater breaking force, then the magnetic air gap between yoke plates increases, but the magnetic suction decreases and anti-short circuit function is compromised
Solution Approach 1:
The magnetic conduction system is segmented into a first magnetic conduction block fixed to the cover body and a second magnetic conduction block fixed to the movable contact spring. This segmentation allows the movable contact spring to move with over-stroke while the first magnetic conduction block remains stationary, maintaining a constant magnetic air gap and thus constant magnetic suction force throughout the over-stroke range.
Solution Approach 2:
The first magnetic conduction block is preliminarily positioned on the inner side surface of the cover body's top, establishing a fixed reference point for the magnetic circuit before over-stroke occurs. This preliminary positioning ensures that regardless of how much the movable contact spring compresses the elastic component during over-stroke, the magnetic air gap remains constant, preserving the anti-short circuit function.
2Productivity
If over-stroke is increased to effectively tear off bonds, then the compression elastic deformation increases, but the magnetic air gap widens and magnetic suction decreases
Solution Approach 1:
The magnetic conduction path is divided into two independent blocks: the first magnetic conduction block attached to the stationary cover body and the second magnetic conduction block attached to the movable contact spring. This segmentation decouples the magnetic circuit from the mechanical over-stroke movement, allowing the movable contact spring to achieve sufficient compression for reliable contact making while the magnetic air gap remains constant, thus maintaining strong magnetic attraction force.
3Force
If the movable contact spring compresses the elastic component more during over-stroke, then the breaking force increases, but the position relationship between magnetic conduction blocks changes and magnetic suction is reduced
Solution Approach 1:
The magnetic conduction system is segmented into a stationary first magnetic conduction block and a movable second magnetic conduction block. The first block is fixed to the cover body and does not move during over-stroke, while the second block moves with the movable contact spring. This segmentation ensures that the relative position between the two magnetic conduction blocks remains constant throughout the over-stroke range, maintaining constant magnetic suction force even as the elastic component is compressed to generate breaking force.
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 solution ensures that the anti-short circuit function is not affected by over-stroke, maintaining the magnetic attraction force and preventing separation of movable and fixed contacts, thereby enhancing the relay's performance.
Implementation Method 1
the first magnetic conduction block and the second magnetic conduction block are used for forming magnetic flux
Implementation Method 2
maintaining a consistent magnetic air gap and magnetic attraction force
Implementation Method 3
the contact pressure spring will be further compressed, that is, the compression elastic deformation will occur to produce over-stroke
Data Source
AI summary
An anti-short circuit structure (10) of a high-capacity relay, the structure (10) comprising a housing assembly (100) and a pushing assembly (200). The housing assembly (100) comprises two static contacts (110), a first magnetically conductive block (120), a cover body (130), a transition block (160), and a yoke plate (140). The first magnetically conductive block (120) is disposed on an inner side surface of the top part of the cover body (130). The pushing assembly (200) comprises a fixing support (210), a stop piece (220), a movable reed (230), a second magnetically conductive block (240), an elastic member (250), and a push rod (260). The fixing support (210) comprises two fixing side arms (211) and a receiving plate (212). One end of the stop piece (220) is connected to the tail end of one fixing side arm (211), and the other end of the stop piece (220) is connected to the tail end of the other fixing side arm (211). Two ends of the movable reed (230) are disposed facing the two static contacts (110) respectively, and the second magnetically conductive block (240) is disposed facing the first magnetically conductive block (120). The first magnetically conductive block (120) and the second magnetically conductive block (240) are used to form magnetic flux. In the described anti-short circuit structure (10), when a coil is excited, the positions of the first magnetically conductive block (120) and the second magnetically conductive block (240) do not change due to overtravel. A magnetic air gap does not increase as overtravel increases, and an increase in overtravel does not affect magnetic attraction and does not affect the anti-short circuit function of the relay.