Atmospheric Plasma Head Active Cooling via Flowing Medium
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Solution Overview
Problem
Existing atmospheric plasma devices face instability and reliability issues due to heat buildup in the plasma head, which can lead to transformer failure and inefficient plasma generation, especially in continuous operation scenarios where convection cooling is insufficient.
Innovation Solution
Integrating a flowing medium, such as process gas, for active temperature control within the plasma head, utilizing channels or heat sinks to manage heat dissipation, and potentially mixing with another cooling medium to maintain a stable operating temperature without additional cooling lines, ensuring efficient plasma production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transformer and plasma nozzle are integrated into a single plasma head, then cable breakage and arcing are reduced, but heat buildup causes transformer failure and damaged plasma generation
Solution Approach 1:
A cooling medium is introduced as an intermediary substance that flows through channels in the plasma head housing, acting as a heat transfer mediator between the transformer and the external environment. This allows heat to be removed from the compact plasma head without requiring separation of components, thus maintaining reliability while controlling temperature.
2Temperature
If convection cooling is used for the plasma head, then heat dissipation is achieved, but cooling is insufficient for continuous operation and certain plasma head designs
Solution Approach 1:
Instead of relying solely on natural convection, the invention employs a forced flow cooling system where a cooling medium (gas or liquid) is pumped through channels in the plasma head housing. This hydraulic/pneumatic approach provides controlled, reliable heat removal that maintains stable temperature during continuous operation, overcoming the limitations of passive convection cooling.
3Temperature
If additional cooling lines are added to the plasma head, then heat dissipation is improved, but device complexity and compact design are compromised
Solution Approach 1:
The cooling medium serves multiple functions: it cools the transformer, flows through the plasma head housing, and can be integrated with the existing plasma generation system. By making the cooling system multi-functional and integrating it into the existing plasma head structure rather than adding separate cooling infrastructure, the invention achieves efficient heat dissipation without significantly increasing device complexity.
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
This approach maintains a stable and reliable plasma head operation by actively controlling temperature, maximizing plasma yield and preventing transformer damage, while maintaining a compact design without additional cooling infrastructure.
Implementation Method 1
The medium is the process gas. The plasma head can be actively temperature controlled by the flowing medium. Heat is continuously carried away from the plasma head by the flowing medium.
Implementation Method 2
Known plasma systems, such as those described in US 2015/0054405 A1, employ cooling methods where heat is dissipated from the plasma head housing by convection.
Implementation Method 3
The high voltage generated by the transformer ionizes a process gas in the plasma nozzle through a discharge.
Implementation Method 4
The increased temperature of the process gas due to the absorption of thermal energy has no effect on the efficiency of plasma formation.
Data Source
Figure 1~2
Figure 3
AI summary
For the treatment of surfaces made of plastic, metal, ceramic, etc., for cleaning or activation purposes, it is known to subject them to atmospheric plasma. It is known to integrate a transformer and a plasma nozzle into a common plasma head for plasma generation. A disadvantage of this approach is the power loss of the transformer, which accumulates as heat in the plasma head. This heat generation can be so significant that it affects plasma generation. The invention provides a device and a method for generating atmospheric plasma that ensures stable and reliable operation. For this purpose, a plasma head (10) is assigned a transformer (12) and at least one plasma nozzle (13), and the plasma head (10) has at least one supply line for a flowing medium for active temperature control of the plasma head (10).