Contactor Arc Extinguishing Layout to Prevent Contact Pollution
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Solution Overview
Problem
Existing arc extinguishing systems for contactors face challenges such as increased costs and complexity due to the use of J-shaped contacts, and pollution from arc extinguishing chamber pollutants falling on the movable contact, which affects the electrical life of the product.
Innovation Solution
An arc extinguishing system that includes an arc extinguishing chamber with arc extinguishing grids oriented perpendicular to the movable contact, and an arc striking piece with a U-shaped connection part and a guide part that extends past the arc extinguishing grids to guide the arc effectively into the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a J-shaped stationary contact is used to attract the arc outward through magnetic field, then the arc can be extinguished effectively, but the product cost increases due to more copper material and the product depth increases to accommodate the J-shaped contact
Solution Approach 1:
The invention extracts the arc-attracting function from the stationary contact itself and relocates it to a separate arc striking piece. This separation allows the stationary contact to remain simple and straight while the arc striking piece (with its J-shape) handles the arc attraction, thereby reducing the overall product depth and copper material requirements while maintaining effective arc extinguishing
Solution Approach 2:
The invention segments the contact system into distinct functional components: a straight stationary contact for electrical connection and a separate arc striking piece for arc attraction and guidance. This segmentation allows each component to be optimized independently, reducing overall complexity and material usage while maintaining arc extinguishing effectiveness
2Reliability
If arc extinguishing grids are arranged in parallel with the movable contact, then the arc can be extinguished, but pollutants in the arc extinguishing chamber fall on the movable contact and pollute it, affecting electrical life
Solution Approach 1:
The invention uses asymmetric arrangement where the arc extinguishing grids are positioned perpendicular to the movable contact rather than parallel, creating an asymmetric configuration that directs pollutants away from the movable contact while maintaining effective arc interruption
Solution Approach 2:
Instead of arranging arc extinguishing grids parallel to the movable contact (conventional approach), the invention inverts the arrangement by positioning them perpendicular to the movable contact, which changes the pollution trajectory and prevents contaminants from falling on the movable contact
3Reliability
If a J-shaped arc striking piece is used to generate magnetic field for arc movement, then the arc can be directed outward, but the existing design requires the arc striking piece to be located on both sides of the stationary contact, increasing device complexity
Solution Approach 1:
The invention extracts the arc direction control function from a complex bilateral configuration and implements it through a single arc striking piece positioned at one end of the stationary contact, simplifying the overall device structure while maintaining effective arc direction control
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 prevents pollutants from falling on the movable contact, optimizes arc extinguishing by guiding the arc efficiently into the arc extinguishing grids, and reduces product costs and complexity by eliminating the need for J-shaped contacts.
Implementation Method 1
a J-shaped stationary contact is usually used to attract the arc to move outward through the magnetic field generated by reverse current
Implementation Method 2
When the arc strikes on the arc extinguishing grids, the arc is cut into several sections, and the arc is extinguished by increasing the arc voltage
Data Source
AI summary
The present disclosure relates to an arc extinguishing system for contactor and a contactor. The arc extinguishing system includes: an arc extinguishing chamber, accommodating a plurality of arc extinguishing grids, and an extension direction of each of the plurality of arc extinguishing grids being perpendicular to an extension direction of the movable contact; an arc striking piece, electrically connected to the stationary contact and configured to extend toward the arc extinguishing chamber, so that the arc generated upon the movable contact and the stationary contact being separated moves along the arc striking piece toward the arc extinguishing chamber.