DC Relay Arc Extinguishing With Composite Permanent Magnet Fields
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Solution Overview
Problem
Existing high-voltage DC relays struggle with ineffective arc extinction due to weak magnetic field strength at the arc starting point, particularly in large-load products, which cannot meet the demands of new energy vehicles and energy storage projects.
Innovation Solution
The DC relay employs a configuration of first and second permanent magnets arranged around the movable contact piece to create a horizontal and longitudinal magnetic field, enhancing magnetic field strength at the contacts, and includes additional features like U-shaped yokes and anti-short circuit rings to further strengthen the magnetic field and accelerate arc extinction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a permanent magnet is arranged outside the end of the movable contact piece to generate magnetic field for arc extinction, then the arc blowing direction is improved, but the magnetic field strength at the arc starting point becomes weak
Solution Approach 1:
The patent transitions from a single-dimension horizontal magnetic field arrangement to a two-dimension composite magnetic field arrangement by adding vertical magnets below the movable contact piece. This dimensional expansion allows the magnetic field to act more effectively on the arc starting point while maintaining proper arc blowing direction.
Solution Approach 2:
The patent combines horizontal and vertical magnetic field components to create a composite magnetic field. The horizontal magnets provide arc blowing direction while the vertical magnets enhance magnetic field strength at the contact point, and their combined effect achieves both arc extinction requirements simultaneously.
2Power
If the ceramic cavity size is increased to accommodate large-load products, then the load capacity is improved, but the magnetic field strength at the arc starting point decreases
Solution Approach 1:
The patent applies local quality enhancement by positioning vertical magnets directly below the movable contact piece at the arc starting point. This localized magnetic field reinforcement ensures that even in large ceramic cavities, the critical contact point receives sufficient magnetic field strength for effective arc extinction.
3Ease of operation
If dual permanent magnets are arranged horizontally to achieve non-polarity, then the arc blowing direction is improved, but the magnetic field strength at the center of the leading-out terminal becomes weak
Solution Approach 1:
The patent merges horizontal and vertical magnetic field arrangements to create a composite magnetic field configuration. The horizontal magnets maintain non-polarity and provide arc blowing direction, while the vertical magnets reinforce the magnetic field at the center of the leading-out terminal, achieving both requirements simultaneously.
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 enhanced magnetic field configuration improves arc extinction efficiency, increasing the speed of arc extinction and ensuring reliable operation in high-load applications.
Implementation Method 1
an arc is blown using magnetic field generated by arranging permanent magnets around the contacts
Implementation Method 2
arc extinction is implemented using a horizontal magnetic field formed by the first permanent magnets
Data Source
AI summary
A high-voltage DC relay with permanent magnet arc extinguishing function includes two static contact leading-out terminals having static contacts; a movable contact piece having movable contacts; first permanent magnets around the movable contact piece, wherein a side having polarity of the first permanent magnets faces the contacts such that arc extinction is implemented using a horizontal magnetic field formed by the first permanent magnets; and third permanent magnets provided on the static contact leading-out terminals, the polarity of the sides facing the contacts of the third permanent magnets is opposite to that of the first permanent magnets such that magnetic field strength at the contacts can be enhanced by a longitudinal magnetic field formed by the first and the third permanent magnets, and arc extinction can be implemented.