Supercritical CO2 Machining Fluid Distribution for Seal Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional machining systems are not well-suited for supercritical machining fluids, which require different approaches due to their unique properties and behaviors, and existing systems face challenges in delivering and managing these fluids effectively, including compatibility issues with seals and lubricant distribution.
Innovation Solution
The development of machining systems that utilize a supercritical machining fluid supply system, including a centralized distribution system for scCO2, a valve arrangement for switching between supercritical and conventional fluids, and a lubricant distribution system that delivers a predetermined flow rate to multiple machining tools, along with temperature monitoring for leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional machining fluid delivery systems are used with supercritical fluids, then the existing infrastructure can be utilized, but the system reliability deteriorates due to incompatibility with seals and unique fluid properties
Solution Approach 1:
The system changes the physical parameters of the machining fluid by utilizing supercritical carbon dioxide, which fundamentally alters the fluid's properties (density, viscosity, compressibility) compared to conventional liquids. This requires modified delivery systems that can handle supercritical state parameters while maintaining compatibility with machining operations
Solution Approach 2:
The patent introduces specialized components as intermediaries between the supercritical fluid supply and the machining tool, including pressure regulators, temperature controllers, and specially designed seals that are compatible with supercritical CO2, thereby enabling reliable fluid delivery without direct exposure of conventional components to incompatible supercritical conditions
2Reliability
If supercritical machining fluids are delivered to multiple machining tools individually, then each tool receives adequate lubrication, but the device complexity increases due to separate delivery systems
Solution Approach 1:
The system merges multiple separate lubricant delivery systems into a single centralized distribution network that supplies supercritical CO2 to multiple machining tools simultaneously. This consolidation reduces overall system complexity while maintaining adequate lubrication delivery to each tool through the shared infrastructure
Solution Approach 2:
The centralized distribution system is designed with universal components that can serve multiple machining tools with different requirements. The system uses multi-functional valves and regulators that can adjust parameters to suit different tools while maintaining a single unified delivery infrastructure
3Reliability
If supercritical CO2 is used as machining fluid, then cooling and lubrication effectiveness is improved, but the difficulty of detecting and measuring fluid state increases
Solution Approach 1:
The system incorporates feedback mechanisms including pressure sensors, temperature sensors, and flow meters that continuously monitor the supercritical CO2 state and provide real-time data to the control system. This feedback enables automatic adjustment of delivery parameters and detection of fluid state changes, making the invisible supercritical state measurable and controllable
Solution Approach 2:
The patent replaces traditional mechanical fluid monitoring methods with electronic sensing and digital measurement systems. Electronic pressure transducers, temperature sensors, and flow meters substitute for mechanical gauges and manual monitoring, enabling more precise and easier detection of supercritical fluid state parameters
4Ease of repair
If centralized lubricant distribution is implemented, then maintenance costs are reduced through standardized delivery, but the device complexity increases due to additional distribution infrastructure
Solution Approach 1:
The centralized distribution system is segmented into modular components including independent control units for each machining tool, separate pressure regulation zones, and distributed temperature control points. This segmentation allows individual components to be maintained or replaced without affecting the entire system, reducing maintenance complexity despite the extended 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
This solution enables efficient cooling and lubrication with supercritical fluids, providing better heat transfer and lubrication characteristics, while reducing maintenance and operational costs through centralized systems and ensuring system compatibility and safety.
Implementation Method 1
The pressure booster is constructed and arranged to receive the liquid from the first storage tank and increase the pressure of the liquid to a first pressure greater than a critical pressure of the liquid
Implementation Method 2
The heater is fluidly coupled to the pump and constructed and arranged to increase a temperature of the liquid to a first temperature greater than a critical temperature of the liquid
Implementation Method 3
Machining tools, such as milling systems, lathes, computer numerical control (CNC) systems, robotic drills, and/or machining centers may employ machining fluids such as metalworking fluids to provide cooling and/or lubrication during a cutting or forming process
Data Source
AI summary
Improvements in machining systems that utilize machining fluids comprising a supercritical fluid are described. Some systems may provide centralized distribution of a supercritical machining fluid and/or a lubricant to a plurality of machining tools in a machining facility. Other systems may allow for selective delivery of multiple machining fluids to a machine tool. For example, a supercritical machining fluid and a non-supercritical machining fluid may be selectively delivered to a machining tool as desired for a particular machining process.