Plasma Arc Torch Coolant Purging Before Consumable Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During the changing of consumable parts in a plasma arc cutting torch, cooling liquid, such as water, can ingress and egress into the torch head, potentially damaging components and leading to a loss of coolant.
Innovation Solution
A plasma arc cutting assembly is equipped with a coolant channel system that includes a coolant supply conduit, return conduit, and control valves to facilitate the use of pressurized process gas for purging liquid coolant by flowing it through the system, ensuring its removal before consumable parts are changed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If consumable parts are changed in the plasma torch, then the torch can be reused for cutting operations, but cooling liquid can flow into the arc chamber and damage components
Solution Approach 1:
The system performs preliminary purging action by activating the control valve to flow process gas through the coolant channels before consumable part removal. This preliminary action removes cooling liquid from the arc chamber and coolant channels, preventing damage during subsequent part changes while maintaining productivity
2Temperature
If cooling liquid is circulated through the torch during operation, then the torch components are cooled effectively, but cooling liquid is lost when consumable parts are changed
Solution Approach 1:
The control valve system performs preliminary purging before part removal, creating a gas barrier that prevents cooling liquid from escaping into the arc chamber during consumable part changes. This maintains coolant volume while continuing effective cooling during operations
Solution Approach 2:
Process gas acts as an intermediary substance that flows through the coolant channels during part changes, forming a barrier that prevents cooling liquid from leaving the torch. This intermediary gas flow protects the coolant system from loss while maintaining operational cooling
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
Effectively removes liquid coolant from the torch before consumable part replacement, preventing damage and maintaining system integrity.
Implementation Method 1
A plasma arc cutting assembly is equipped with a coolant channel system that includes a coolant supply conduit, return conduit, and control valves to facilitate the use of pressurized process gas for purging liquid coolant
Data Source
AI summary
Plasma arc cutting assemblies and methods that facilitate the purging of liquid from a cooling system that functions to cool components of a torch during a cutting operation. One aspect includes delivering a process gas into the cooling system to purge from it the liquid coolant. This is achieved by coupling a process gas source with a coolant supply conduit and delivering process gas into the coolant supply conduit through one or more control valves situated between the process gas source and the coolant supply conduit. Process gas from the gas source may be simultaneously delivered into a process gas flow channel of the torch during the purging process. Monitoring a liquid coolant level in a storage tank into which the liquid coolant flows may occur during the purging process, with an automatic closing of the one or more control valves occurring when a high liquid coolant level is detected.