Relay Contact Structure Using Closed Magnetic Loop Against Electric Repulsion
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Solution Overview
Problem
Existing relays fail to provide sufficient contact pressure while maintaining compact size and low coil power, leading to electric repulsion issues during high current faults, which affects the stability of the contact between movable and stationary contacts.
Innovation Solution
A relay design incorporating a movable contact plate, push rod, electromagnetic assembly, reset elastic member, and elastic assemblies with magnetically guiding sheets that form a closed magnetic loop to offset electric repulsion, providing increased pressing force and stability through a combination of electromagnetic attraction and elastic forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the relay maintains compact size and low coil power, then the relay structure is simplified and energy consumption is reduced, but the contact pressure is insufficient to resist electric repulsion during high current faults
Solution Approach 1:
The elastic assembly is divided into multiple elastic members (first elastic member and second elastic member) with different elastic coefficients. This segmentation allows each elastic member to contribute differently to the overall contact pressure, enabling sufficient pressing force while maintaining compact structure and low coil power requirements.
Solution Approach 2:
The patent uses elastic members with different elastic coefficients to change the force parameters dynamically. The first elastic member with a smaller elastic coefficient provides initial contact pressure, while the second elastic member with a larger elastic coefficient provides additional pressure when needed, allowing the system to achieve high contact pressure without requiring high coil power.
2Force
If the relay uses compact size design, then the device dimensions are reduced, but the contact pressure is insufficient leading to contact instability during high current faults
Solution Approach 1:
The elastic members are arranged in a nested configuration where the first elastic member and second elastic member are positioned concentrically or in overlapping arrangements. This nesting allows multiple elastic members to occupy minimal space while collectively providing sufficient contact pressure to resist electric repulsion during high current faults.
Solution Approach 2:
By using elastic members with different elastic coefficients arranged in a compact configuration, the patent achieves high contact pressure in a small volume. The varying elastic coefficients allow the system to maximize force output within the constrained space of the compact relay design.
3Force
If the relay operates with low coil power, then energy consumption is reduced, but the contact pressure is insufficient causing contact bounce during high current faults
Solution Approach 1:
The elastic members serve themselves by providing the necessary contact pressure through their inherent elastic properties without requiring additional energy input from the coil. The first and second elastic members automatically generate the required pressing force based on their elastic coefficients, reducing the energy burden on the coil while ensuring stable contact during high current faults.
Solution Approach 2:
The patent changes the force parameters by using elastic members with different elastic coefficients, allowing the system to achieve high contact pressure with minimal coil energy consumption. The elastic members convert stored elastic energy into mechanical pressing force, reducing the need for continuous high-power coil operation.
4Object-affected harmful factors
If the relay uses simple elastic member configuration, then the device complexity is reduced, but the ability to resist electric repulsion during high current faults is insufficient
Solution Approach 1:
The elastic assembly is segmented into multiple elastic members with different elastic coefficients, where the first elastic member and second elastic member work together to provide enhanced resistance against electric repulsion. This segmentation allows the system to handle high current faults more effectively while maintaining a relatively simple overall structure that can be integrated into the existing relay design.
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 solution enhances the stability of the contact between movable and stationary contacts, effectively resisting electric repulsion during high current faults, ensuring reliable operation while maintaining a compact size and low coil power.
Implementation Method 1
both the first magnetically guiding sheet and the second magnetically guiding sheet are able to be magnetized by a current passing through the movable contact plate, the second magnetically guiding sheet and the first magnetically guiding sheet are able to form a closed magnetic loop
Implementation Method 2
there presents an electromagnetic attraction force between the first magnetically guiding sheet and the second magnetically guiding sheet, and the electromagnetic attraction force may offset a part of the electric repulsion
Implementation Method 3
at least one set of elastic assemblies, whose elastic force acts on the push rod and the movable contact plate, the elastic assembly comprising at least two elastic members
Data Source
AI summary
Disclosed in the present disclosure is a relay, relating to the technical field of switch devices, including a fixed base, a stationary contact, a movable contact plate, a push rod, an electromagnetic assembly, a reset elastic member, an elastic assembly, a first magnetically guiding sheet, and a second magnetically guiding sheet; the first magnetically guiding sheet is provided on a side of the movable contact plate facing the stationary contact, the second magnetically guiding sheet is provided on a side of the movable contact plate away from the stationary contact, both the first magnetically guiding sheet and the second magnetically guiding sheet can be magnetized by a current passing through the movable contact plate, the second magnetically guiding sheet and the first magnetically guiding sheet can form a closed magnetic loop.