Relay Contact Piece Structure for Short-Circuit Contact Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic latching relays face challenges in resisting short-circuit current due to insufficient contact pressure between movable and static contacts, which is not effectively addressed in existing technologies.
Innovation Solution
A contact piece structure with two movable contact pieces arranged side by side, featuring bending pairs with reduced distance between piece bodies and bumps in the gaps of spring pieces to enhance contact pressure and resist short-circuit current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact pressure between movable contact and static contact is increased to resist short-circuit current, then the ability to resist short-circuit current is improved, but the movable contact and static contact become difficult to disconnect
Solution Approach 1:
The contact piece structure is divided into two separate movable contact pieces arranged side by side, each with its own spring piece. This segmentation allows the repulsive force from short-circuit current to be distributed across multiple contact points rather than concentrating on a single contact, enabling the contacts to maintain pressure while still allowing for disconnection when needed.
Solution Approach 2:
Spring pieces are added at specific locations (between the two movable contact pieces) to provide localized elastic force. This local quality enhancement ensures that the contact pressure is maintained precisely where needed to resist short-circuit current, while the overall contact structure remains capable of disconnection through the magnetic latching mechanism.
2Force
If the distance between two piece bodies is reduced to increase electromotive force, then the contact pressure is improved, but the space requirement is reduced
Solution Approach 1:
Bending portions are incorporated into the piece bodies, creating curved geometries that allow the contacts to approach each other more closely. The bending portions enable the piece bodies to be positioned with reduced distance between them, thereby increasing the electromotive force while maintaining adequate space for operation and heat dissipation.
3Reliability
If the contact pressure is increased to prevent disconnection under short-circuit conditions, then the reliability is improved, but the contact structure becomes more complex
Solution Approach 1:
The spring pieces are designed to automatically generate the necessary contact pressure through their elastic properties. When the movable contact pieces are actuated, the spring pieces naturally exert restoring force to maintain contact pressure, eliminating the need for additional complex pressure-generation mechanisms. This self-service approach improves reliability while keeping the structure relatively simple.
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 effectively increases contact pressure between movable and static contacts, making it difficult for them to disconnect under short-circuit conditions, thereby improving the reliability of magnetic latching relays.
Implementation Method 1
In the parallel circuit structure formed by the two movable contact pieces, currents attract each other in the same direction to generate electromotive force
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A contact piece structure includes two movable contact pieces arranged side by side. Each movable contact piece includes a piece body, a movable contact and a static contact located at opposite ends of the piece body. The movable contact and the static contact of one of the movable contact pieces correspond to the static contact and the movable contact of the other movable contact piece respectively so as to form a parallel circuit structure when the contacts being in contact; Bending portions of two piece bodies are arranged one-to-one to form a bending pair; in each of the bending pairs, top ends of two bending portions are parallel with each other; two bending portions protrude along a same protruding direction, a first distance between the two bending portions is smaller than a second distance between the two ends of two piece bodies.