DC Relay Contact Structure With Current-Responsive Magnetizer
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Solution Overview
Problem
High-voltage DC relays face challenges in balancing short circuit anti-capability and breaking ability due to the negative correlation between the two, leading to potential contact bounce and detachment issues under high short circuit currents, which complicates the design in achieving a compact and lightweight structure.
Innovation Solution
A relay design featuring a movable magnetizer that adjusts its distance relative to the movable member based on the current flowing through the contact piece, utilizing an elastic part to adjust the magnetic attraction force, allowing for both effective anti-short circuit and overload breaking capabilities without the need for excessive coil holding force, thus optimizing the relay's compactness and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary anti-short circuit structure is employed, then the ability to withstand short circuit is enhanced, but the breaking ability is weakened
Solution Approach 1:
The patent employs a movable magnetizer instead of a stationary one, allowing the magnetic field strength to dynamically adjust during operation. The magnetizer can move closer to the movable contact piece under short circuit conditions to increase holding force, while maintaining normal breaking capability during regular operation. This dynamic adjustment resolves the contradiction between enhanced short circuit resistance and maintained breaking ability.
2Force
If the size of the coil is increased to increase the holding force of the movable core, then the holding force is improved, but the compact and lightweight design is compromised
Solution Approach 1:
The movable magnetizer allows the system to achieve high holding force dynamically during short circuits without requiring a larger coil. By positioning the magnetizer closer to the contact piece when needed, the magnetic field strength increases significantly, providing sufficient holding force with a compact coil design. This eliminates the need to increase coil size for enhanced holding force.
Solution Approach 2:
The patent changes the position parameter of the magnetizer relative to the movable contact piece to control the magnetic field strength. By adjusting the distance between the magnetizer and contact piece, the system can achieve variable holding force without changing the coil size, thus maintaining compact dimensions while providing adequate holding force when required.
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 adjustable magnetic attraction force enhances the relay's ability to resist short circuit-induced repulsion forces while ensuring timely breaking, improving anti-short circuit performance and reducing power consumption and volume, thereby maintaining a compact and lightweight design.
Implementation Method 1
the first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece
Implementation Method 2
utilizing an elastic part to adjust the magnetic attraction force
Data Source
Figure 1
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Figure 3
AI summary
A relay includes an insulating cover (1 1a) having a contact chamber (101) and a pair of first through holes (102) in communication with the contact chamber (101); a pair of static contact leading-out terminals (20) passing through the pair of first through holes (102), respectively; a fixing member (60) within the contact chamber (101) and fixedly connected with the insulating cover (11a); a moving part (80) within the contact chamber (101) and movably connected to the fixing member (60); a first magnetizer (40) within the contact chamber (101) and connected with the moving part (80); and a movable member (53) movably within the contact chamber (101) and including a movable contact piece (54). Wherein the first magnetizer (40) is movable relative to the movable member (53) through the moving part (80) and is configured to adjust a distance between the first magnetizer (40) and the movable member (53) according to a value of a current flowing through the movable contact piece (54).