Liquid-Cooled Plasma Arc Torch Layout for Tight-Space Maneuvering
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Solution Overview
Problem
Conventional liquid cooled plasma arc torches are too wide for maneuvering in tight spaces, such as interior corners of workpieces like wide flange beams, making them difficult to use and increasing the cost of consumables due to larger diameters.
Innovation Solution
A plasma arc torch design with offset fluid conduits and fittings that reduce the torch width by allowing parallel fluid communication through radially offset ducts, combined with a spring compression plug for electrical connection, facilitating a narrower profile and efficient cooling liquid circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional liquid cooled plasma arc torches use standard fluid conduits and fittings arranged in series, then the torch structure is simple and easy to manufacture, but the torch width becomes too large for maneuvering in tight spaces
Solution Approach 1:
The patent transitions from a linear series arrangement of fluid conduits to a three-dimensional offset configuration where conduits are arranged in parallel but at different radial positions. The offset fittings create a stepped pattern (first duct at one radial position, second duct radially offset at another position) that reduces the torch diameter while maintaining all necessary fluid pathways.
2Ease of operation
If the torch diameter is reduced to improve maneuverability, then ease of operation in tight spaces improves, but the structural complexity of conduits and fittings increases
Solution Approach 1:
The offset fittings nest multiple ducts within a compact radial space. The first duct and second duct are arranged concentrically with offset connections, allowing the cooling liquid pathway to fold back on itself rather than extending linearly. This nesting approach maintains functionality while minimizing the outer diameter.
3Ease of manufacture
If larger diameter consumables are used in conventional torches, then the torch structure is simpler and more robust, but the cost of consumables increases
Solution Approach 1:
The patent changes the geometric parameters of the consumable components by reducing their diameter while maintaining structural integrity through the offset fitting design. The offset configuration allows smaller diameter electrode, nozzle, and swirl ring to be used, directly reducing consumable costs while the overall torch structure remains manufacturable.
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
Enables easier maneuverability in tight spaces and reduces the cost of consumables by allowing the use of smaller diameter components, while maintaining effective cooling and electrical insulation.
Implementation Method 1
liquid cooling to transfer the heat away from some of the cutting torch components
Implementation Method 2
A spring compression plug electrically connects the pilot arc conductor to the nozzle body
Data Source
AI summary
A plasma arc torch includes a cathode extending along an axis of the torch, a pilot arc conductor, and a nozzle body. A first fluid conduit and second fluid conduit extend parallel to the axis of the torch. A first offset fitting includes a first duct coupled to and in fluid communication with the first fluid conduit, and a second duct in fluid communication with the first duct and outwardly radially offset from the first duct and extending away from the first duct in a proximal direction. A second offset fitting includes a third duct coupled to and in fluid communication with the second fluid conduit, and a fourth duct in fluid communication with the third duct and outwardly radially offset from the third duct and extending away from the third duct in the proximal direction. A spring compression plug electrically connects the pilot arc conductor to the nozzle body.