Vacuum Switch Connection Tube for Stable Contact Pressure
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Solution Overview
Problem
The existing switching devices for medium voltage electrical units, which use vacuum interrupters in parallel with the main circuit, face reliability issues due to the degradation of the electrical connection between the conductive plate and the connection wire over time, leading to reduced efficiency.
Innovation Solution
A switching device design that incorporates a connection tube within an accommodating recess of the conductive plate, where the wall of the recess exerts an elastic holding force on the tube, ensuring a robust and constant contact pressure, thereby enhancing the long-term reliability of the electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the plate is made of material with high elastic limit (e.g., stainless steel) to resist mechanical forces, then the mechanical strength is improved, but the spring effect relaxes the contact pressure on the connection wire over time, degrading electrical connection quality
Solution Approach 1:
The connection system is divided into two functional parts: the plate made of high-strength material (stainless steel) for mechanical resistance, and the connection tube made of elastic material (phosphor bronze) for maintaining contact pressure. This segmentation allows each component to optimize its material properties for its specific function, resolving the contradiction between mechanical strength and electrical connection reliability
Solution Approach 2:
The connection tube acts as an intermediary element between the plate and the connection wire. It transfers the mechanical force from the plate while simultaneously providing elastic recovery to maintain consistent contact pressure on the wire, thus mediating between the high-strength plate and the electrical connection requirement
2Duration of action of stationary object
If the plate material is rigid (e.g., stainless steel) to withstand switch forces, then the mechanical durability is improved, but the contact pressure on the connection wire decreases over time due to spring effect, reducing electrical connection quality
Solution Approach 1:
The connection system is divided into two functional parts: the plate made of high-strength material (stainless steel) for mechanical resistance, and the connection tube made of elastic material (phosphor bronze) for maintaining contact pressure. This segmentation allows each component to optimize its material properties for its specific function, resolving the contradiction between mechanical strength and electrical connection reliability
Solution Approach 2:
The material properties are changed by selecting phosphor bronze for the connection tube, which has specific elastic characteristics that allow it to maintain constant contact pressure over time. This parameter change in material selection resolves the contradiction between mechanical durability and electrical connection quality
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 elastic holding force maintains a consistent and reliable contact between the connection tube and the plate, overcoming creep effects and ensuring the long-term stability and efficiency of the switching device.
Implementation Method 1
the wall of the recess exerts an elastic holding force on the tube
Implementation Method 2
a connection wire electrically linking the plate and the mobile electrode, the connection wire being in electrical contact with a connection tube
Data Source
AI summary
A switching device, including:a main switch configured to be displaced between a closed position of a main circuit and an open position,a vacuum interrupter including:a fixed electrode,a mobile electrode, configured to be displaced between:a first, so-called closed, position, anda second, so-called open, position, in which the electrodes are apart,a palette configured to make the mobile electrode switch over from the first position to the second position and comprising an electrically conductive plate, the main switch being configured to drive the palette via the plate,a connection wire electrically linking the plate and the mobile electrode, the wire being in electrical contact with a tube disposed in an accommodating recess of the plate,wherein the accommodating recess comprises a wall exerting an elastic holding force on the tube.