DC Relay Arc Chamber Layout for Arc Isolation and Extinguishment
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Solution Overview
Problem
Existing DC relays face challenges in preventing electrical interference between current-carrying and control current-carrying components, securing sufficient space for arc extinguishment, and protecting components from arc damage, especially when using DC power without an auxiliary power source.
Innovation Solution
The design incorporates an arc chamber with a diamond-shaped cross-section and a DC relay configuration that separates current and control current components, using a magnetic field induced outside the chamber to ensure sufficient insulation and prevent component damage, while maintaining the structural integrity of existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the auxiliary contact is accommodated in the inner space of the arc chamber with the fixed contact and movable contact, then the device complexity is reduced, but electrical interference occurs between the current applied to the contacts and the control current applied to the auxiliary contact
Solution Approach 1:
The arc chamber is divided into two distinct spaces by a partition wall: a first space for accommodating the fixed contact and movable contact, and a second space for accommodating the auxiliary contact. This segmentation physically separates the high-current path from the control current path, eliminating electrical interference while maintaining a compact overall structure.
2Reliability
If the permanent magnet is disposed on the inner surface of the extension part forming a portion of the arc chamber, then the arc can be induced effectively, but the flow space of the arc is reduced due to the space occupied by the permanent magnet
Solution Approach 1:
The extension part of the arc chamber is designed with an asymmetric structure where the permanent magnet is disposed only on specific surfaces (first and second surfaces) rather than all inner surfaces. This asymmetric arrangement optimizes the magnetic field distribution for effective arc induction while leaving other surfaces open to maximize the arc flow space and prevent space occupation issues.
3Reliability
If a separate auxiliary power source is used for DC relay operation, then the relay can be operated reliably, but the device complexity and cost increase
Solution Approach 1:
The auxiliary contact is electrically connected to the coil through the partitioned arc chamber, allowing the same contact system to serve dual functions: switching the main load current and providing control current to the coil. This multi-functionality eliminates the need for a separate auxiliary power source, reducing device complexity and cost while maintaining reliable operation.
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 configuration effectively excludes electrical interference, secures sufficient space for arc extinguishment, and protects components from damage, all without requiring excessive structural changes to the DC relay.
Implementation Method 1
The magnet forms a magnetic field inside a space where the fixed contact and the movable contact are in contact with each other. The discharge path of the arc may be formed by the electromagnetic force generated by the formed magnetic field and current flow.
Implementation Method 2
The DC relay includes a coil that generates a magnetic force to move the movable contact point.
Data Source
AI summary
An arc chamber and a direct current relay including the same are disclosed. The arc chamber may include a chamber space for accommodating a fixed contactor and a movable contactor that are electrically connected to an external power source or an external load; and a plurality of walls surrounding the chamber space from outside, wherein the plurality of walls include a first wall extending in one direction; a second wall extending in the other direction while forming a predetermined angle with the first wall from an end of the first wall; a third wall extending in the one direction while forming a predetermined angle with the second wall from an end of the second wall; and a fourth wall extending in the other direction while forming a predetermined angle with the third wall from an end of the third wall to the end of the first wall.