Magnetic Latching Relay Bent Spring Contact Pressure
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Solution Overview
Problem
Magnetic latching relays face challenges in resisting varying short-circuit currents while maintaining miniaturization and low power consumption, as existing designs either increase product size and power consumption or fail to meet compatibility standards for different short-circuit current grades.
Innovation Solution
The design incorporates two sets of moving spring portions with bent portions that are convex on one side and concave on the other, allowing for increased effective length and reduced distance between spring pieces, enhancing contact pressure and suction force to resist short-circuit currents, while maintaining consistent performance across different standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closing pressure of the moving and stationary contacts is increased to counteract electric repulsion during short-circuit current, then the relay can resist short-circuit current, but the external dimensions of the product increase and power consumption of the coil control portion increases
Solution Approach 1:
The moving spring piece incorporates bent portions (first and second bent portions) that create curved geometries. These bent portions increase the effective length of the spring piece without proportionally increasing the overall product dimensions, thereby enhancing the electromagnetic force (F=BIL) generated during short-circuit current while maintaining a compact form factor.
Solution Approach 2:
The design utilizes the bending of the spring piece to extend its effective length in a spatial dimension rather than simply increasing the linear distance between contacts. This dimensional approach allows the spring piece to generate sufficient electromagnetic force during short-circuit current without proportionally increasing the product's external dimensions.
2Reliability
If the closing pressure of the moving and stationary contacts is increased to counteract electric repulsion during short-circuit current, then the relay can resist short-circuit current, but the power consumption of the coil control portion increases
Solution Approach 1:
The bent portions of the moving spring piece increase the effective length and improve the spring's mechanical properties, allowing for better force distribution. This reduces the peak closing pressure required from the coil, thereby lowering the power consumption of the coil control portion while still maintaining adequate contact pressure to resist short-circuit current.
Solution Approach 2:
The design changes the geometric parameters of the moving spring piece by introducing bent portions, which alters the spring's stiffness and force characteristics. This parameter change allows the system to achieve the required contact pressure with reduced coil power consumption by optimizing the mechanical leverage and force distribution.
3Length of moving object
If the bending of the first bent portion of one moving spring piece is made smaller than the other to allow fitting, then the effective length is increased and distance between spring pieces is reduced, but the structural complexity increases
Solution Approach 1:
The design intentionally introduces asymmetry by making the bending of the first bent portion of one moving spring piece smaller than the other. This asymmetric design allows the bent portions to fit together, increasing the effective length of the spring pieces and reducing the distance between them, while the asymmetry itself is a deliberate design choice to achieve the desired geometric configuration.
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 design effectively increases contact pressure and suction force, ensuring reliable operation under varying short-circuit conditions without compromising miniaturization or power efficiency, and ensures compatibility with different short-circuit current standards.
Implementation Method 1
The design incorporates two sets of moving spring portions with bent portions that are convex on one side and concave on the other, allowing for increased effective length and reduced distance between spring pieces, enhancing contact pressure and suction force to resist short-circuit currents
Implementation Method 2
When the relay is inputted forward pulse voltage, the magnetic circuit system works and the push block pushes the moving spring portion to make the static and movable contacts contact with each other
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
Disclosed is a magnetic latching relay capable of resisting a short-circuit current. The magnetic latching relay comprises a contact portion. The contact portion is comprised of two sets of movable spring portions (1, 2) substantially parallel to each other. The movable spring portions comprise movable leafs (11, 21), movable contacts (12, 22), movable spring tabs (13, 23), and stationary contacts (14, 24). Each of both movable leafs (11, 21) is disposed with a first bending portion (111, 211) having one surface raised and the other surface recessed in a thickness direction. Both of the first bending portions (111, 211) are raised in the same direction, and the curve of the first bending portion (211) of one movable leaf (21) is smaller than the curve of the first bending portion (111) of the other movable leaf (11), such that the raised portion of the first bending portion (211) of one movable leaf (21) can fit in the recessed portion of the first bending portion (111) of the other movable leaf (11), such that the effective length of each movable leaf is increased while the distance between two movable leafs (11, 21) is reduced. The magnetic latching relay of the present disclosure can increase electromagnetic attraction between two sets of movable spring portions, so as to effectively increase a contact pressure between contacts, thereby resisting a short-circuit current.