Plasma Torch Electrode Nozzle Contact Cycle
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Solution Overview
Problem
Conventional blowback plasma torches are slow to cycle on and off, leading to imprecise timing in establishing and extinguishing the plasma arc, which is problematic for marking operations and can interfere with electronics due to noise emissions in high-frequency start torches.
Innovation Solution
The method involves bringing the electrode into contact with the nozzle while current is flowing to extinguish and restart the plasma arc, maintaining power and gas flow, allowing for quicker cycling and precise control of the plasma arc in blowback plasma torches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional blowback plasma torches are used for marking operations, then the plasma arc can be established and extinguished, but the cycling time is slow and timing precision is poor
Solution Approach 1:
The patent replaces the mechanical blowback starting mechanism with a high-frequency electrical discharge mechanism. Instead of using gas pressure to blow the arc back, a high-frequency voltage is applied to the electrode to initiate the arc through dielectric breakdown, significantly reducing restart time and improving timing precision.
Solution Approach 2:
The patent changes the electrical parameters by applying high-frequency voltage (typically 20-100 kHz) to the electrode during the restart phase. This parameter change enables rapid arc initiation without the delays associated with mechanical blowback mechanisms, directly addressing the slow cycling time issue.
2Productivity
If high frequency start torches are used to reduce restart time, then cycling speed improves, but conducted and radiated noise interferes with nearby electronics
Solution Approach 1:
The patent extracts the high-frequency noise-generating components from the torch system by using a separate external high-frequency power supply unit. The torch itself operates at standard frequencies, while the external unit generates the high-frequency pulses needed for rapid arc restart, thereby maintaining productivity without the noise interference problem.
Solution Approach 2:
The patent introduces an intermediary coupling mechanism between the high-frequency power supply and the torch electrode. This intermediary system transfers the high-frequency energy needed for rapid cycling while filtering out conducted and radiated noise, allowing fast cycling speed without interfering with nearby electronics.
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 approach enables faster and more precise cycling of the plasma arc, reducing interference with electronics and improving the efficiency of marking operations without the noise issues associated with high-frequency start torches.
Implementation Method 1
contacting the nozzle with an electrode while current is flowing through the electrode to extinguish the plasma arc
Implementation Method 2
Some or all the gas is ionized into a plasma arc between the electrode and the workpiece
Implementation Method 3
A gas is directed through a nozzle toward a workpiece. Some or all the gas is ionized into a plasma arc
Data Source
AI summary
Techniques for extinguishing a plasma arc in a blowback plasma torch are provided. The plasma arc can be extinguished by bringing the electrode into contact with the nozzle and out of contact with the nozzle while the power supply and flow of gas are left on. In particular, while current is flowing through the electrode, the electrode may be brought into contact with the nozzle to extinguish the plasma arc.