Conduction-breaking device with deforming mechanism
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Solution Overview
Problem
Conduction-breaking devices that cut a conductive body at two positions to prevent arcs between cut ends are susceptible to arc generation due to short distances between cut ends, which can lead to unbroken conduction and potential damage from arc-induced heat.
Innovation Solution
A conduction-breaking device with a deforming mechanism that bends the separated piece to maximize the distance between cut ends, placing them on the leading side of the cutting member's movement, thereby increasing electric resistance and attenuating arcs within an arc-extinguishing chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cuttable portion is cut at two positions to increase electric resistance, then arc generation is reduced, but the distance between cut ends remains short which allows arcs to still occur
Solution Approach 1:
The separated piece is deformed from a flat shape into a bent shape with curvature. The deforming mechanism bends the separated piece such that the cut ends are positioned on the leading side in the moving direction of the cutting member, maximizing the spatial distance between cut ends and the remaining portions. This curvature-based positioning effectively increases the arc attenuation distance while maintaining the two-position cutting structure.
2Productivity
If the separated piece is pushed into the arc-extinguishing chamber by the cutting member, then the cutting action is completed, but the flat shape of the separated piece keeps the cut ends close to remaining portions
Solution Approach 1:
The deforming mechanism is integrated into the cutting member and acts simultaneously with the cutting action. As the cutting member pushes the separated piece into the arc-extinguishing chamber, the deforming mechanism concurrently bends the separated piece to position cut ends on the leading side. This preliminary deformation during the cutting process maximizes distance without requiring a separate deformation step, maintaining high productivity.
3Reliability
If two fixed blades and two movable blades are used to cut at two positions, then conduction is broken more effectively, but the device complexity increases
Solution Approach 1:
The deforming mechanism is integrated with the cutting member, combining multiple functions into a single component. The cutting member simultaneously performs cutting (with two movable blades) and deformation (bending the separated piece) functions. This merging reduces the need for separate mechanisms while achieving both effective conduction breaking and arc attenuation through the positioned cut ends.
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
Effectively reduces the occurrence of arcs and prevents unbroken conduction, protecting the conductive body and surrounding components from heat damage by increasing the distance between cut ends and enhancing arc attenuation.
Implementation Method 1
the cutting member receives the pressure of the gas and is moved toward the arc-extinguishing chamber
Implementation Method 2
the cuttable portion receives a shearing force generated by the fixed blade and movable blade, which cuts the cuttable portion
Implementation Method 3
the electric resistance is increased. Therefore, the voltage required to generate and maintain an arc is increased
Data Source
AI summary
A conduction-breaking device breaks conduction between a pair of devices in an electric circuit. The conduction-breaking device includes a conductive body having a cuttable portion, an arc-extinguishing chamber having a pair of fixed blades, a gas generator, a cutting member having a pair of movable blades, and a deforming mechanism. When the cuttable portion is cut at two positions by the fixed blades and the movable blades, the cuttable portion forms a separated piece, which is separated from the electric circuit, and first and second remaining portions, which remain connected with the electric circuit. The separated piece has cut ends at opposite ends. The deforming mechanism deforms the separated piece such that the cut ends of the separated piece are located on a leading side in a moving direction of the cutting member with respect to a part of the separated piece between the cut ends.