Switch Unit Arc Extinguishing Structure for Current Cutoff
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Solution Overview
Problem
Conventional switch technologies fail to effectively extinguish arcs generated during current cutoff, leading to potential deformation and melting of the switch, posing safety risks and causing property losses.
Innovation Solution
A power supply system with a switch unit featuring a movable contact that rotates relative to a static contact, utilizing an arc extinguishing structure with strategically arranged gate plates to cover the arc's path, enhancing arc extinguishing by guiding and cutting off the arc through a series of openings and magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch cuts off current using conventional technology, then the circuit is opened, but the arc is not effectively extinguished causing switch deformation and melting
Solution Approach 1:
The arc extinguishing structure is divided into multiple gate plates (first gate plate, second gate plate, etc.) arranged in sequence. Each gate plate segments the arc path and contributes to progressive arc extinction, preventing any single point from bearing the full arc energy that would cause deformation or melting.
Solution Approach 2:
The gate plates serve as intermediary elements between the movable contact and the external environment. These plates intercept and control the arc, guiding it through a controlled path rather than allowing direct contact between the movable contact and surrounding structures, thus preventing uncontrolled arc damage.
2Reliability
If the movable contact rotates by a larger angle to separate from the static contact, then the arc is better extinguished, but the switch structure becomes more complex
Solution Approach 1:
Instead of relying solely on increasing the rotation angle of the movable contact to extinguish the arc, the invention introduces gate plates arranged in a spatial configuration around the arc path. This adds a dimensional element to arc control, allowing effective arc extinguishing without requiring excessive rotation angles that would complicate the switch mechanism.
Solution Approach 2:
The arc control function is extracted from the movable contact rotation mechanism and assigned to the dedicated gate plates. This separation allows the movable contact to perform its primary switching function with minimal rotation while the gate plates handle the arc extinguishing task independently.
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 extinguishes arcs by ensuring they are guided into and cut off by the arc extinguishing structure, reducing the risk of switch deformation and improving safety and reliability.
Implementation Method 1
A connection line between the first arc extinguishing end part and the rotation center of the movable contact is a first line. A connection line between the second arc extinguishing end part and the rotation center of the movable contact is a second line. An included angle between the first line and the second line is a second included angle.
Implementation Method 2
The first arc extinguishing structure is located around the first static contact and is configured to extinguish the first arc
Implementation Method 3
The first arc extinguishing structure includes a first arc extinguishing end part and a second arc extinguishing end part... the first arc extinguishing structure can cover a part or the whole of a movement path of the first arc, so that the first arc can be better cut off and extinguished
Data Source
AI summary
A power supply system includes a control unit, a switch, a direct current source, and a power change unit. The switch includes a switch unit and an operation mechanism. The operation mechanism is configured to receive a switch-off signal and control the switch unit to be turned on or off. The switch unit includes a first static contact, a movable contact, and a first arc extinguishing structure. When the switch unit is turned off, the movable contact rotates about a rotation center relative to the first static contact by a first included angle to be separated from the first static contact, to generate a first arc. The first arc extinguishing structure includes a first arc extinguishing end part and a second arc extinguishing end part. A connection line between the first arc extinguishing end part and the rotation center of the movable contact is a first line.