Vented Plasma Arc Torch With Water Shield for Faster Clean Cuts
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Solution Overview
Problem
Traditional plasma arc torches are costly due to the use of expensive gases for cutting operations and have limited cut speeds due to quality considerations, necessitating a more efficient and cost-effective solution for enhancing cutting performance.
Innovation Solution
The implementation of a plasma arc torch system that incorporates a vented nozzle and uses water as a shield fluid, combined with a efficient shield fluid delivery system, to achieve higher cut speeds and improved cut quality by constraining the plasma arc with both the nozzle exit orifice and the surrounding liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If expensive plasma gases (H35, F5) and nitrogen shield gas are used, then cut quality is maintained, but operational cost increases significantly
Solution Approach 1:
The patent replaces expensive, reusable plasma gases (H35, F5) and nitrogen shield gas with inexpensive, readily available alternatives: compressed air as plasma gas and water as shield fluid. This substitution dramatically reduces operational costs while maintaining cut quality through the synergistic combination of vented nozzle design and water shield configuration
Solution Approach 2:
The patent changes the physical parameters of the cutting system by introducing a vent passage in the nozzle that allows a portion of plasma gas to escape, creating a specific pressure distribution. This parameter change enables the use of cheaper gases while maintaining arc constriction and cut quality through controlled gas flow dynamics
2Manufacturing precision
If traditional plasma gases are used, then cut quality is acceptable, but cutting speed is limited
Solution Approach 1:
The patent segments the plasma gas flow into two distinct paths: one portion exits through the nozzle exit orifice to maintain arc constriction and cut quality, while another portion exits through the vent passage to provide additional plasma gas to the cut zone. This segmentation enables higher cutting speeds by increasing gas flow rate without sacrificing cut quality
Solution Approach 2:
The vent passage acts as an intermediary element that introduces additional plasma gas between the plasma chamber and the cut zone. This intermediary path supplies extra ionized gas that enhances the plasma arc's cutting capability, enabling higher speeds while maintaining quality
3Productivity
If high cutting speed is achieved, then productivity increases, but cut quality deteriorates
Solution Approach 1:
The patent applies different functions to different parts of the gas flow system: the nozzle exit orifice provides localized arc constriction for quality, while the vent passage provides additional plasma gas supply for speed. The water shield is positioned to provide localized cooling and dross removal at the cut edge, enabling high speed operation without quality loss
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 significantly reduces operational costs by using inexpensive fluids, increases cutting speed by up to 50%, and enhances cut quality by providing a dross-free, smooth cut with a heat-affected zone reduction, while maintaining a cut edge appearance similar to the base material.
Implementation Method 1
ionizing a first portion of the plasma gas to form a plasma arc in the plasma chamber
Implementation Method 2
The vent passage, disposed in the nozzle body, is configured to divert a portion of the plasma gas exiting the plasma chamber from the nozzle exit orifice
Implementation Method 3
The flow region is configured to (i) receive a liquid and (ii) expel the liquid along with a plasma arc substantially surrounded by the liquid via the shield exit orifice
Data Source
AI summary
A plasma arc torch system comprising a plasma arc torch is provided. The torch includes an electrode, a nozzle, a vent passage and a shield. The nozzle is spaced from the electrode to define a plasma chamber therebetween. The plasma chamber is configured to receive a plasma gas. The vent passage, disposed in the nozzle body, is configured to divert a portion of the plasma gas exiting the plasma chamber from a nozzle exit orifice. The shield is spaced from the nozzle to define a flow region therebetween. The flow region is configured to (i) receive a liquid and (ii) expel the liquid along with a plasma arc substantially surrounded by the liquid via a shield exit orifice.