Gas-Cooled Plasma Torch Nozzle for High-Current Arc Stability
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Solution Overview
Problem
Existing plasma arc torches require external cooling systems, which increase equipment expense, maintenance, and are vulnerable to spills, particularly for high-current systems that generate more heat and have larger cooling demands.
Innovation Solution
Incorporating gas cooling channels within the nozzle of the plasma arc torch, with features such as angled impingement surfaces and mixing channels to enhance cooling capabilities, allowing for improved heat transfer and distribution of cooling gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external cooling systems (water supplies, reservoirs, heat exchange equipment) are used for high-current plasma arc torches, then cooling capability is improved, but equipment expense increases, maintenance requirements increase, and vulnerability to spills increases
Solution Approach 1:
The patent extracts the cooling function from external cooling systems and integrates it directly into the torch body through internal cooling channels. This eliminates the need for external water supplies, reservoirs, heat exchange equipment, and supply pumps, thereby reducing equipment expense and maintenance requirements while maintaining effective cooling capability for high-current operation
Solution Approach 2:
The patent merges the cooling system with the torch structure by incorporating cooling channels directly within the torch body, electrode, and nozzle components. This integration combines the previously separate cooling function with the torch operational components, eliminating external cooling equipment and reducing overall system complexity
2Duration of action of stationary object
If gas cooling channels are incorporated within the nozzle, then cooling capability is improved and consumable life is increased, but device complexity increases
Solution Approach 1:
The patent nests cooling channels within the existing nozzle structure, embedding the cooling function inside the consumable component itself. This nested arrangement allows the cooling channels to be integrated within the nozzle body without adding external components, thereby extending consumable life through improved cooling while minimizing increases in device complexity
Solution Approach 2:
The cooling channels are designed to be self-contained within the consumable components (nozzle, electrode), allowing these components to cool themselves during operation. This self-service cooling approach eliminates the need for separate external cooling systems and extends consumable life without requiring complex external infrastructure
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 enhanced cooling capabilities lead to more stable plasma arcs, increased consumable life, reduced downtime, and improved cutting performance, including faster cutting speeds and reduced consumable wear.
Implementation Method 1
a gas cooling channel formed between an inner (e.g., interior) wall and an outer (e.g., exterior) wall to direct a cooling gas flow around the body of the nozzle
Implementation Method 2
an electrode (e.g., cathode) mounted within the body, a nozzle (e.g., anode) with a central orifice that can produce a pilot arc to the electrode to initiate a plasma arc in a flow of a suitable gas
Data Source
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AI summary
In some aspects, nozzles for plasma torches can include a nozzle body having a proximal end and a distal end that define a nozzle body length and a longitudinal axis. The body can include an exit orifice defined by the distal end; a plenum extending from the proximal end to a plenum floor, a distance from the plenum floor to the distal end defining a plenum floor thickness, and a distance from the plenum floor to the proximal end defining a proximal end height; and a bore extending from the plenum floor to the exit orifice that has a bore length and a bore width. The nozzle body has a nozzle width in a direction transverse to the longitudinal axis. The nozzle body length is greater than the width and a ratio of the proximal end height to the plenum floor thickness is less than 2.0.