Magnetic-Loop Relay Structure for Short-Circuit Contact Stability
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Solution Overview
Problem
Existing short-circuit relays fail to provide sufficient contact pressure to resist electric repulsion during high current faults, leading to instability and potential circuit damage, as they compromise on compact size and low coil power.
Innovation Solution
A short-circuit-resistant relay design featuring a push rod assembly with magnetically guiding sheets and an overtravel elastic member, which shortens the distance between magnetically guiding sheets to enhance magnetic attraction and apply additional pressing force to the movable contact, ensuring stable contact closure under high current conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the push rod assembly is designed with traditional support member and blocking member structure, then the relay maintains compact size and low coil power, but the clearance between support member and blocking member reduces the ability to resist electric repulsion
Solution Approach 1:
The first and second magnetically guiding sheets are introduced as intermediary components between the push rod assembly and the movable spring sheet. These sheets form a magnetic loop that generates magnetic attraction force, acting as a mediator to enhance the pressing force on the movable contact without requiring structural changes to the push rod assembly's support and blocking members.
Solution Approach 2:
The patent changes the magnetic field parameters by introducing magnetically guiding sheets with specific magnetic properties. The magnetic loop formed by these sheets creates a concentrated magnetic field that increases the attraction force between the movable and stationary contacts, thereby improving short-circuit resistance without altering the physical dimensions of the relay.
2Reliability
If the relay uses traditional contact structure without magnetically guiding sheets, then the device complexity remains low, but the contact pressure is insufficient to resist electric repulsion under high current
Solution Approach 1:
The magnetically guiding system is segmented into two separate sheets (first and second magnetically guiding sheets) positioned at opposite sides of the movable spring sheet. This segmentation allows the magnetic field to be distributed effectively while keeping each individual component simple and easy to manufacture, minimizing the increase in device complexity.
Solution Approach 2:
The magnetically guiding sheets serve multiple functions: they guide the magnetic field to concentrate on the contact area, provide structural support for the movable spring sheet, and contribute to the overall mechanical strength of the relay assembly. This multi-functionality reduces the need for additional separate components.
3Reliability
If the relay is designed with sufficient contact pressure to resist electric repulsion, then the short-circuit resistance improves, but the coil power consumption increases
Solution Approach 1:
The patent replaces part of the mechanical force generation system with a magnetic field system. Instead of relying solely on the coil-generated electromagnetic force to provide contact pressure, the magnetic loop formed by the magnetically guiding sheets creates an additional magnetic attraction force, reducing the burden on the coil and lowering power consumption while maintaining sufficient contact pressure.
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 design improves the stability and reliability of contact closure, effectively resisting electric repulsion and meeting the requirements for high current short-circuit resistance without compromising compact size or low coil power.
Implementation Method 1
the first magnetically guiding sheet and the second magnetically guiding sheet form a magnetic loop
Implementation Method 2
generate an electromagnetic attraction force to the movable contact sheet
Implementation Method 3
generate electric repulsion between the movable contact and stationary contact when a fault of short-circuit current occurs
Implementation Method 4
an end of the overtravel elastic member is connected to the movable spring sheet, the other end of the overtravel elastic member is connected to the push rod assembly
Data Source
AI summary
A short-circuit-resistant relay includes a fixed base, a contact lead-out end, a push rod assembly, a first and a second magnetically guiding sheet. Provided are at least two contact lead-out ends providing with stationary contact, both ends of the movable spring sheet are provided with movable contacts, the first magnetically guiding sheet is movably provided, along a direction in parallel to the movement of the movable spring sheet, on a side of the movable spring sheet facing the stationary contact, and the second magnetically guiding sheet is provided on a side of the movable spring sheet distal to the stationary contact, in which the first and second magnetically guiding sheets are capable of forming a magnetic loop, and the first magnetically guiding sheet moves in a direction facing the second magnetically guiding sheet and in parallel to the movement of the movable spring sheet within a preset travel.