Compact High-Pressure Gas Regulator for Portable Chromatography
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Solution Overview
Problem
Current gas chromatographs are large, heavy, and not easily portable, limiting their use for detecting low to mid-level chemical and biological agents, particularly in field applications where rugged and lightweight detectors are needed.
Innovation Solution
A portable, multi-dimensional gas chromatograph system with at least two separation columns, thermal conductivity detectors, a pre-concentrator, and a gas flow regulator, featuring a compact high-pressure regulator and multiport valve for consistent gas flow and easy operation in field conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gas chromatograph is designed for high accuracy detection, then measurement precision is improved, but device size and weight increase, reducing portability
Solution Approach 1:
The gas chromatograph is divided into separate functional modules including a portable regulator assembly, detector assembly, and chromatograph body. This segmentation allows each component to be optimized independently and facilitates modular configuration that reduces overall weight while maintaining detection accuracy through specialized components like the thermal conductivity detector and pre-concentrator.
Solution Approach 2:
The patent implements a nested configuration where the pre-concentrator is integrated into the detector assembly, and the regulator is designed as a compact unit that fits within or alongside the chromatograph body. This nesting approach reduces the total volume and weight of the portable system while maintaining all necessary functional capabilities for accurate chemical detection.
2Measurement precision
If thermal conductivity detectors are made small and fragile for precision, then measurement precision is improved, but reliability decreases due to vulnerability to vibration and temperature variations
Solution Approach 1:
The detector assembly is designed with vibration isolation mechanisms and thermal shielding that protect the fragile thermal conductivity detector from field conditions before damage can occur. The pre-concentrator and regulator assemblies also serve as protective enclosures that stabilize the detector environment, cushioning it against mechanical vibrations and temperature fluctuations while maintaining detection sensitivity.
Solution Approach 2:
The detector assembly is enclosed in a protective housing that provides mechanical shielding while maintaining thermal and gas flow characteristics. This protective shell isolates the fragile detector from external vibrations and temperature variations, allowing the detector to maintain its precision while being robust enough for field deployment.
3Device complexity
If gas flow regulation is simplified, then device complexity is reduced, but loss of information occurs due to inability to maintain consistent flow under varying pressures
Solution Approach 1:
The regulator incorporates a feedback mechanism that monitors gas pressure and flow conditions and automatically adjusts the regulator positioning to maintain consistent gas flow to the chromatograph. This feedback system ensures that variations in source pressure or demand do not affect the stability of gas flow, maintaining accurate detection while keeping the regulator design relatively simple.
Solution Approach 2:
The regulator acts as an intermediary device between the gas source and the chromatograph, decoupling the system from pressure variations. It provides a stable intermediate gas flow that is independent of source pressure fluctuations, ensuring consistent detection conditions without requiring complex flow control mechanisms throughout the entire system.
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
Enables accurate detection and identification of chemical compounds at low to mid-level concentrations in a portable and rugged format, suitable for field use, with the ability to withstand vibrations and temperature variations.
Implementation Method 1
a thermal conductivity detector to detect and measure the constituent components of the gasses being analyzed
Implementation Method 2
at least one pre-concentrator
Implementation Method 3
Separation columns typically contain liquid or solid materials as a stationary phase, and separate the individual components based on their affinity for the medium
Data Source
AI summary
A Gas regulator capable of reducing the pressure of a gas supply from thousands of psi to as low as 30 psi with an accuracy level of +/â1 psi. The regulator uses at least two oppositely oriented gas stages to reduce the pressure. The first stage performs gross pressure reductions and subsequent stages perform fine pressure reductions. The regulator easily connects to commercially available gas bottles and can easily activate or deactivate gas flow without needing to disconnect the gas bottle. The regulator has a compact design and can provide readings which can be integrated into computer, online, or dynamic systems.