Movable Magnetizer Relay Structure for DC Short-Circuit Breaking
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Solution Overview
Problem
High-voltage DC relays face challenges in balancing anti-short circuit and breaking abilities due to the negative correlation between short circuit and breaking forces, which affects their compact and lightweight design, leading to potential contact bounce issues.
Innovation Solution
A relay design that includes a movable magnetizer relative to the movable member, adjustable distance between magnetizers, and an elastic part to manage magnetic attraction force based on current levels, ensuring both anti-short circuit and limit breaking abilities without excessive coil holding force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary anti-short circuit structure is used to enhance short circuit ability, then the ability to withstand short circuit current is improved, but the breaking ability is weakened
Solution Approach 1:
The patent applies the dynamics principle by making the upper magnetizer movable rather than stationary. The upper magnetizer can dynamically adjust its position relative to the movable core based on operating conditions, allowing it to provide strong holding force during normal operation while permitting rapid separation during breaking operations. This dynamic adjustment resolves the contradiction between maintaining strong anti-short circuit ability and preserving breaking ability.
2Reliability
If the size of the coil is increased to increase the holding force of the movable core, then the anti-short circuit ability is improved, but the compact and lightweight design is conflicted
Solution Approach 1:
The patent uses the dynamics principle by making the upper magnetizer movable, which allows the magnetic field distribution to be dynamically optimized. This enables achieving sufficient holding force with a smaller coil compared to stationary structures, as the movable upper magnetizer can concentrate magnetic flux more effectively during normal operation while maintaining compact dimensions.
Solution Approach 2:
The patent applies parameter changes by altering the position parameter of the upper magnetizer. By adjusting the distance and relative position between the upper magnetizer and movable core, the magnetic coupling efficiency is optimized, allowing reduced coil size while maintaining adequate holding force for anti-short circuit protection.
3Reliability
If the distance between the first magnetizer and the movable member is reduced to enhance magnetic attraction, then the anti-short circuit ability is improved, but the breaking ability is compromised
Solution Approach 1:
The patent applies the dynamics principle by making the distance between the first magnetizer and the movable member dynamically adjustable. During normal operation, the distance is minimized to maximize magnetic attraction force for anti-short circuit protection. During breaking operations, the distance increases rapidly, allowing strong breaking ability. This dynamic distance adjustment resolves the contradiction between magnetic attraction force and breaking speed.
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 design enhances anti-short circuit ability while reducing power consumption and volume, improving structural strength and explosion resistance by transferring magnetic force to the yoke plate, allowing for both effective short circuit protection and timely breaking.
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
Data Source
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AI summary
A relay includes a contact container (10) including a yoke plate (13) and an insulating cover (11a connected with the yoke plate (13) to form a contact chamber (101); a pair of static contact leading-out terminals (20) passing through a pair of first through holes (102) of the insulating cover (11a); a fixing member (60) within the contact container (10) and fixedly connected with the yoke plate (13); a movable member (53) within the contact chamber (101) and including a movable contact piece (54) configured to come into contacted with or separated from the pair of static contact leading-out terminals (20); a moving part (80) movable connected to the fixing member (60); and a first magnetizer (40) connected with the moving part (80). 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).