Leak Detection Upstream of Mixing Point in Sample Separation
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Solution Overview
Problem
Existing sample separation devices, such as liquid chromatography systems, face operational challenges due to fluid leaks, which alter the flow and composition of the mobile phase, affecting the separation process and requiring frequent system shutdowns for repair.
Innovation Solution
A sample separation device equipped with a leak detection unit that analyzes the displacement of a displacement pump in conjunction with flow measurements at or upstream of the mixing point, allowing for the detection and localization of leaks, and includes sensors to quantify the leak rate and identify the affected fluid conduit, enabling precise compensation for the leak's impact on the separation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a leak detection unit is added to detect leaks upstream of the mixing point, then the reliability of the separation process is improved, but the device complexity increases
Solution Approach 1:
The system divides the fluid delivery into separate channels (first fluid conduit and second fluid conduit) with individual displacement pumps for each channel. This segmentation allows independent monitoring and control of each fluid stream, enabling reliable leak detection without requiring complex system-wide modifications.
Solution Approach 2:
A mixing point is introduced as an intermediary element where the first and second fluids are combined before entering the separation column. By placing the leak detection upstream of this mixing point and analyzing displacement versus flow relationships, the system can identify leaks in individual channels before they affect the overall separation process, maintaining reliability while using relatively simple detection logic.
2Reliability
If the system continuously monitors displacement and flow to detect leaks, then the reliability is improved, but the use of energy increases
Solution Approach 1:
The system employs feedback control by continuously comparing the displacement of the displacement pump with the actual flow rate measured at the mixing point. When a discrepancy is detected indicating a leak, the system can adjust pump operations or alert operators. This feedback mechanism maintains high reliability while optimizing energy use by only actively correcting or alerting when necessary rather than continuously consuming energy for correction.
Solution Approach 2:
The monitoring system uses partial action by focusing detection efforts on critical parameters (displacement versus flow relationship) rather than continuously measuring all possible system parameters. This selective monitoring approach achieves reliable leak detection while minimizing the energy required for sensing and data processing.
3Manufacturing precision
If the system shuts down upon leak detection to maintain separation integrity, then the manufacturing precision is preserved, but the productivity decreases
Solution Approach 1:
The system performs preliminary leak detection upstream of the mixing point by monitoring the relationship between pump displacement and actual flow. By detecting leaks before they reach the separation column, the system can take preliminary corrective actions (such as adjusting pump parameters or isolating affected channels) that maintain separation precision without requiring complete system shutdown, thereby preserving productivity.
Solution Approach 2:
The system dynamically responds to detected leaks by adjusting operational parameters rather than immediately shutting down. The control system can modify pump speeds, adjust flow rates, or switch to alternative operating modes that compensate for the leak's effects, maintaining adequate separation precision while keeping the system running and productive.
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
The leak detection unit effectively identifies and quantifies leaks, enabling the system to modify its operation mode to compensate for the leak's effects, maintaining the separation process's integrity and reducing the need for frequent shutdowns and repairs.
Implementation Method 1
a first displacement pump coupled to the first fluid conduit and configured for pumping the first fluid by a volumetric displacement of the first fluid
Implementation Method 2
The leak detection unit is configured for detecting or locating the leak by analyzing a displacement of the displacement pump in conjunction with a flow at or upstream of the mixing point
Implementation Method 3
a mixing point (such as an intersection of the first fluid conduit and the second fluid conduit) in fluid communication with and arranged downstream of the first fluid conduit and the second fluid conduit and adapted for mixing the first fluid with the second fluid
Implementation Method 4
a sample separation unit (such as a chromatographic column) adapted for separating the sample
Data Source
AI summary
A sample separation device (100) for separating a sample, the sample separation device (100) comprising a first fluid conduit (102) for conducting a first fluid, a second fluid conduit (104) for conducting a second fluid, a sample separation unit (106) adapted for separating the sample, a mixing point (108) in fluid communication with and arranged downstream of the first fluid conduit (102) and the second fluid conduit (104) and adapted for mixing the first fluid with the second fluid to supply the mixed fluid composition towards the sample separation unit (106) for separation of the sample comprised in the fluid composition, and a leak detection unit (110) adapted for detecting a leak upstream of or at the mixing point (108).