Sample Separation Metering Device for Active Pressure Damping
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Solution Overview
Problem
Existing sample separation devices face challenges in efficiently and cost-effectively damping fluctuations in fluid drive arrangements, leading to pressure and flow ripples that affect the precision and consistency of analysis results, particularly in high-performance liquid chromatography systems.
Innovation Solution
A sample separation device that incorporates a metering device configured as an active damper, controlled by a control device to synchronize with the fluid drive arrangement, actively damping fluctuations in the fluid flow and pressure, eliminating the need for additional damping devices and reducing system complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dual-piston pump design is used to provide continuous flow, then flow precision is improved, but pressure ripples and fluctuations occur at turning points
Solution Approach 1:
A damper is introduced as an intermediary component between the dual-piston pump and the chromatographic column. The damper absorbs pressure ripples and fluctuations generated by the pump's turning points, providing a pulsation-free flow to the column while maintaining the pump's continuous flow capability.
Solution Approach 2:
The damper is positioned beforehand in the high-pressure flow path to compensate for pressure ripples before they reach the chromatographic column. This preemptive cushioning ensures stable pressure and flow conditions throughout the chromatographic analysis.
2Stability of the object's composition
If a damper is added to compensate for pressure ripples, then pressure stability is improved, but device complexity and cost increase
Solution Approach 1:
The metering device, originally designed solely for sample metering, is configured to perform dual functions: sample metering and pressure ripple damping. By controlling the metering device to actively damp fluctuations in the fluid drive arrangement, the system eliminates the need for a separate dedicated damper, thereby reducing device complexity and cost while maintaining pressure stability.
3Stability of the object's composition
If a separate damper device is used, then pressure ripples are reduced, but dead volume increases
Solution Approach 1:
The metering device is configured to serve both sample metering and pressure damping functions. This multi-functionality eliminates the need for a separate damper device, thereby reducing the overall dead volume in the system while still providing effective pressure ripple compensation in the high-pressure flow path.
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 active damping method improves precision and reduces system complexity and costs by using the metering device to compensate for flow and pressure fluctuations, minimizing dead volume and maintaining consistent fluid flow, thereby enhancing the performance of chromatography systems.
Implementation Method 1
a control device configured to control the metering device to thereby actively damp a fluctuation in the fluid drive arrangement operation
Implementation Method 2
a mobile phase comprising a sample fluid (e.g., a chemical or biological mixture) with compounds to be separated is driven through a stationary phase (such as a chromatographic column packing)
Implementation Method 3
liquid separation in a chromatography system, a mobile phase comprising a sample fluid (e.g., a chemical or biological mixture) with compounds to be separated is driven through a stationary phase (such as a chromatographic column packing)
Data Source
AI summary
A sample separation device for separating a fluidic sample includes a fluid drive arrangement for driving a mobile phase along a flow path to a sample separation unit, a sampler for sampling the fluidic sample, and a control device configured to control the metering device to thereby actively damp a fluctuation in the fluid drive arrangement operation. The sampler may include a metering device.