High-Capacity Relay Structure for Stable Magnetic Air Gap
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Solution Overview
Problem
The magnetic air gap between yoke plates in high-capacity relays increases with over-stroke, affecting the anti-short circuit function.
Innovation Solution
An anti-short circuit structure for high-capacity relays is designed with a shell assembly and pushing assembly, featuring magnetic conduction blocks and a movable contact spring system that maintains a consistent magnetic air gap during over-stroke, ensuring the magnetic attraction force remains constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If over-stroke is increased to provide greater breaking force, then the bond-breaking capability is improved, but the magnetic air gap between yoke plates increases, reducing magnetic suction and affecting anti-short circuit function
Solution Approach 1:
The yoke structure is segmented into a first yoke and a second yoke, with the first yoke being divided into a first plate and a second plate. This segmentation allows independent optimization of each segment's function, enabling the first plate to maintain magnetic flux while the overall structure provides sufficient over-stroke for bond breaking.
Solution Approach 2:
The invention transitions from a single-plane yoke structure to a multi-dimensional configuration where the first yoke's first plate and second plate are arranged in different spatial dimensions. The first plate maintains magnetic flux path, while the second plate provides mechanical support for over-stroke, effectively separating magnetic function from mechanical function in different dimensions.
2Reliability
If the thickness of the second yoke is increased to reduce magnetic air gap, then the magnetic suction is improved, but the over-stroke capability is reduced, diminishing the breaking force
Solution Approach 1:
The second yoke is segmented into a first plate and a second plate, allowing the first plate to be optimized for magnetic flux conduction with appropriate thickness, while the second plate provides additional mechanical support and over-stroke capability without interfering with the magnetic flux path.
Solution Approach 2:
Different parts of the yoke structure are given different local qualities: the first plate is designed with optimal thickness for magnetic flux conduction, while the second plate is designed for mechanical strength and over-stroke. This local differentiation allows each component to perform its specific function optimally without compromising the other.
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 structure effectively maintains the magnetic attraction force despite over-stroke, enhancing the anti-short circuit performance by preventing the magnetic air gap from widening, thus stabilizing the contact and improving the relay's durability and reliability.
Implementation Method 1
The first magnetic conduction block and the second magnetic conduction block are used for forming magnetic flux
Implementation Method 2
a magnetic flux is formed between the first magnetic conduction block and the second magnetic conduction block, and a magnetic attraction force is generated between the first magnetic conduction block and the second magnetic conduction block
Implementation Method 3
an elastic component is arranged between the two fixed side arms, one end of the elastic component is connected with the bearing plate, and the other end of the elastic component is connected with the second magnetic conduction block
Data Source
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AI summary
The application provides an anti-short circuit structure for a high-capacity relay. The anti-short circuit structure comprises a shell assembly and a pushing assembly; the shell assembly comprises two fixed contacts, a first magnetic conduction block, a cover body, a transition block and a yoke iron plate; the first magnetic conduction block is arranged at the inner side surface of the top of the cover body; the pushing assembly comprises a fixing support, a stopping sheet, a movable contact spring, a second magnetic conduction block, an elastic component and a pushing rod; the fixing support comprises two fixing side arms and a bearing plate; one end of the stopping sheet is connected with the tail end of one of the fixing side arms, and the other end of the stopping sheet is connected with the tail end of the other fixing side arm; two ends of the movable contact spring respectively face the two fixed contacts; the second magnetic conduction block faces the first magnetic conduction block; and the first magnetic conduction block and the second magnetic conduction block are used for forming magnetic flux. According to the anti-short circuit structure, when a coil is excited, the positions of the first magnetic conduction block and the second magnetic conduction block are not changed due to over-stroke; a magnetic air gap is not widened along with the increase of the over-stroke;the increase of the over-stroke does not influence a magnetic attraction force; and the anti-short circuit function of the relay is not influenced.