Plasma Torch Electrode Heat Pipe Cooling

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Solution Overview

Problem

Traditional water-cooled plasma torch electrodes face issues with high temperature leading to electrode corrosion, shortened lifetime, and the risk of gas explosions due to sudden cooling water gasification in high-temperature environments.

Innovation Solution

Integration of high thermal conductivity heat pipes within the plasma torch electrode, arranged circularly with evaporating and condensing sections, replacing traditional water-cooled systems to enhance heat dissipation and prevent gas explosions by minimizing the amount of working fluid.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If traditional water-cooled electrode with passages is used, then heat dissipation can be achieved, but the temperature at arc root remains high causing electrode corrosion and shortened lifetime

Engineering Contradiction:

Improvearc root temperatureVSAvoidelectrode lifetime

Core Design Contradiction:

TemperatureVSDuration of action of stationary object

Solution Approach 1:

The patent changes the thermal conductivity parameter by replacing traditional water-cooled passages with heat pipes that have ultra-high thermal conductivity (5000-50000 W/m·K), dramatically improving heat dissipation capability and reducing arc root temperature to below copper's melting point

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical water circulation cooling system with a phase-change-based heat pipe system that uses vaporization and condensation cycles, eliminating the need for external water supply and mechanical pumps while achieving superior heat dissipation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Loss of energy

If high-pressure water cooling channels are used, then heat dissipation efficiency is improved, but gas explosion risk increases when water is ejected into high-temperature plasma furnace

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidgas explosion risk

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the harmful element (large amounts of cooling water) from the system by using heat pipes that contain only minimal amounts of working fluid, eliminating the gas explosion hazard while maintaining effective heat dissipation through phase-change heat transfer

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent adopts a design where the heat pipe working fluid is contained in sealed heat pipe structures, effectively making the cooling system disposable-safe - if one heat pipe fails, the minimal fluid it contains cannot cause catastrophic gas explosion, allowing safe shutdown and replacement

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Strength

If magnetic field or variable working airflow is used to guide arc root movement, then electrode erosion is prevented, but power fluctuation occurs

Engineering Contradiction:

Improveelectrode erosion resistanceVSAvoidpower stability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent converts the harmful high temperature at arc root into a benefit by using it to drive the heat pipe phase-change cycle, where the heat input that would normally cause erosion instead powers the vaporization-condensation process that actively removes heat and protects the electrode

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 solution effectively reduces arc root temperature, prolongs electrode lifetime, prevents corrosion, and avoids gas explosions, allowing for safer operation and reduced maintenance costs.

Implementation Method 1

each one of the heat pipes comprises an evaporating section at a front end and a condensing section at a rear end

Methodology Applied

Scientific EffectHeat pipe: Heat Pipe

Implementation Method 2

the heat pipes for the cooling for torch electrode have the merit of very high thermal conductivity

Methodology Applied

Scientific EffectPhase change: Phase Change

Data Source

PatentUS10709005B2Plasma torch electrode with integrated heat pipes

Publication Date: 2020.07.07 ATOMIC ENERGY COUNCIL INSTITUTE OF NUCLEAR ENERGY RESEARCH

AI summary

Plasma torch with an integrated electrode incorporating many heat pipes each heat pipe comprises an evaporating section and a condensing section set at a front end and a rear end of the electrode, respectively. The heat pipes with extremely high thermal conductivity can be used to replace the traditional water-cooled torch's electrode. The effect of reducing the elevated temperature at the torch's arc root zone through cooling by heat pipes is beneficial for prolonging the lifetime of plasma torch. Each heat pipe is filled with a small amount of working fluid. Even if one heat pipe is etched out, the cooling liquid thus ejected is limited without causing gas explosion and rock curing; the rest of heat pipes are not damage and can still function; although the heat dissipation efficiency might be reduced a little, the plasma torch still works. Thus, flexibility of the whole heat dissipation is enhanced.