Plasma Torch Nozzle With Integrated Cooling Channels
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Solution Overview
Problem
Conventional plasma arc torch nozzles face challenges in effective cooling, leading to safety issues and reduced cut quality due to high temperatures, and often require additional components for electrical insulation, increasing complexity and cost.
Innovation Solution
A multi-component nozzle design featuring a conductive inner body and a non-electrically conductive outer shell with internal flow passages forming a coolant loop, directing coolant closer to the plasma arc for improved heat management and reducing electrical arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional plasma arc torch nozzles are used without liquid cooling, then the structure is simpler, but the nozzle reaches extremely high temperatures causing safety issues and reduced cut quality
Solution Approach 1:
The nozzle is divided into multiple components: a conductive body for plasma flow and a separate insulative component for cooling. This segmentation allows the cooling function to be integrated into the nozzle structure itself, eliminating the need for external cooling systems while maintaining simplicity.
Solution Approach 2:
The cooling passages are merged directly into the nozzle body structure, combining the cooling function with the plasma flow path. This integration eliminates separate cooling components and reduces overall system complexity while effectively managing nozzle temperature.
2Reliability
If additional insulation components are added to conventional nozzles, then electrical insulation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The insulative component is merged with the nozzle structure to form an integrated assembly. This component simultaneously provides electrical insulation and defines cooling passages, eliminating the need for separate insulation components and reducing overall device complexity.
Solution Approach 2:
The insulative component serves multiple functions: it provides electrical insulation between the conductive body and surrounding structures, defines the cooling passages, and supports the overall nozzle structure. This multi-functionality reduces the total number of components needed.
3Reliability
If coolant flow passages are positioned away from the plasma arc, then the nozzle structure is simpler, but cooling efficiency is reduced leading to poor cut quality
Solution Approach 1:
The cooling passages are positioned specifically at locations where heat generation is highest - directly adjacent to the plasma arc path and at the nozzle exit. This localized cooling configuration targets the critical thermal zones without requiring complex overall structure, maintaining simplicity while improving cooling efficiency.
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
Enhances cooling efficiency, allowing for optimized nozzle bore dimensions and improved cut quality while reducing manufacturing costs and complexity by eliminating the need for additional insulation components.
Implementation Method 1
Cooling consumables (e.g., the nozzle) of a plasma arc torch with a cooling liquid (e.g., water) can have safety and performance benefits
Implementation Method 2
The torch produces a plasma arc, which is a constricted ionized jet of a plasma gas with high temperature and high momentum
Implementation Method 3
A plasma arc torch generally includes a torch body, an electrode (i.e., a cathode) mounted within the body
Data Source
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AI summary
In some aspects, nozzles for a plasma arc torch can include a first body having a first end, a second end, and a longitudinal axis; and a second body disposed about a portion of the first body to complement the first body, the second body defining a set of channels formed on an internal surface shaped to form a set of liquid flow passages between the first body and the second body, the second body at least partially defining at least one inlet and at least one outlet to the set of liquid flow passages.