Fluid Flow Control via Pressure Gradient and Feedback
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Solution Overview
Problem
Current technologies face challenges in precisely controlling fluid flow rates, especially at low levels, in multi-dimensional analysis systems with coupled chromatographic columns, due to changes in temperature and physical dimensions, limiting the accuracy and automation of flow control.
Innovation Solution
A system comprising a first and second fluid conduit with pressure sensors and controllers to adjust outlet pressures based on conduit dimensions, temperature, and fluid type, ensuring accurate and automated control of fluid flow through multiple coupled tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct flow rate measurement and control is used at low flow rates (on the order of 1 mL/min), then flow control precision can be achieved, but the system becomes costly and problematic
Solution Approach 1:
The patent replaces direct mechanical flow rate measurement and control systems with a pressure-based control system. By measuring pressure differences across known conduit dimensions and using computational models, the system indirectly determines and controls flow rates without requiring complex mechanical flow meters or controllers, thereby reducing system complexity and cost while maintaining precision.
Solution Approach 2:
The patent introduces pressure as an intermediary parameter to control flow rates. Instead of directly measuring and controlling flow, the system measures pressure differences and uses these readings combined with conduit physical parameters to compute and control flow rates indirectly, simplifying the overall control architecture.
2Adaptability or versatility
If temperature is changed during analysis or column dimensions are altered, then analysis flexibility is improved, but flow characteristics change and require complex recomputation and manual adjustment
Solution Approach 1:
The patent implements a feedback control system where pressure sensors continuously monitor pressure differences, and the controller automatically recomputes flow characteristics based on current temperature and conduit parameters. This closed-loop feedback eliminates manual adjustment needs and maintains accurate flow control despite temperature changes or column replacements.
Solution Approach 2:
The patent dynamically adjusts control parameters (pressure settings) based on changes in physical parameters (temperature, conduit dimensions). The controller receives updated physical parameters, recomputes the appropriate pressure settings to maintain desired flow rates, and automatically adjusts the system, enabling flexible operation without manual intervention.
3Measurement precision
If manual adjustment of flow parameters is used to compensate for temperature and dimension changes, then flow accuracy can be maintained, but automation is limited and operation time increases
Solution Approach 1:
The patent enables the system to self-adjust flow parameters automatically. The controller continuously monitors pressure readings, retrieves current conduit physical parameters, recomputes necessary adjustments, and modifies flow control settings without operator intervention. This self-service capability achieves both high accuracy and full automation.
Solution Approach 2:
The patent replaces manual mechanical adjustment operations with an automated computational control system. The controller uses pressure measurements and physical parameter data to automatically compute and implement flow adjustments, eliminating the need for manual intervention while maintaining or improving accuracy.
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 precise and automated control of fluid flow in multi-dimensional analysis systems, maintaining consistent flow rates despite changes in temperature and physical dimensions, enhancing the accuracy and utility of multi-dimensional analysis techniques.
Implementation Method 1
a pressure sensor configured to determine the output pressure of the second fluid conduit
Implementation Method 2
a controller configured to control the outlet pressure of the first fluid conduit, thereby establishing a desired fluid flow through the second fluid conduit based on the length of the second fluid conduit, the inner diameter of the second fluid conduit, the temperature of the second fluid conduit and the type of fluid flowing therein
Data Source
AI summary
A system for controlling fluid flow comprises a first fluid conduit having a length, an inner diameter, an input pressure and an output pressure, and a second fluid conduit having a length, an inner diameter, an input pressure and an output pressure where the output pressure of the first fluid conduit is the input pressure of the second fluid conduit. The system also comprises a pressure sensor configured to determine the output pressure of the first fluid conduit, and a controller configured to control the output pressure of the first fluid conduit, thereby establishing a desired fluid flow through the second fluid conduit based on the length of the second fluid conduit, the inner diameter of the second fluid conduit, the temperature of the second fluid conduit and the type of fluid flowing in the second fluid conduit.