Fluid Supply Device with Elastic Buffer for HPLC Pressure Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-performance liquid chromatography (HPLC) and other sample separation applications, existing fluid supply devices face challenges in precisely forming a mobile phase due to volume errors in mixing fluids, leading to inaccuracies in solvent composition and potential pressure fluctuations.
Innovation Solution
The implementation of a fluid supply device with an elastic buffer unit upstream of the fluid valve to dampen pressure fluctuations, combined with an integrally formed fluid member for precise fluid combining and mixing, and a compensating volume to prevent reflow, ensures accurate solvent composition and extended valve lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an elastic buffer unit is added upstream of the fluid valve to dampen pressure fluctuations, then pressure stability is improved, but device complexity increases
Solution Approach 1:
The elastic buffer unit acts as an intermediary element between the fluid supply conduit and the fluid valve. It absorbs pressure fluctuations and dampens pulses before they reach the valve, thereby stabilizing pressure without requiring complex control systems. The buffer unit mediates the interaction between the fluid source and valve, preventing direct transmission of pressure shocks.
Solution Approach 2:
The elastic buffer unit changes the physical parameters of the fluid system by introducing elasticity and volume compliance. It allows temporary expansion and contraction of the buffer volume to absorb pressure variations, transforming abrupt pressure changes into smoother, more stable pressure profiles before the fluid reaches the valve.
2Duration of action of stationary object
If a compensating volume is introduced to prevent reflow, then valve lifespan is improved, but device complexity increases
Solution Approach 1:
The compensating volume is designed beforehand to accommodate potential reflow of fluid from the fluid conveying unit. This pre-configured volume acts as a cushion that prevents reflowing fluid from reaching and damaging the fluid valve seals. By providing this protective volume in advance, the system prevents valve degradation and extends valve lifespan without requiring active control mechanisms.
3Manufacturing precision
If an integrally formed fluid member is used for precise fluid combining and mixing, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The fluid combining unit and mixing unit are merged into a single integrally formed fluid member. This integration ensures precise fluid combining and mixing by eliminating connection errors and ensuring accurate fluid paths. The unified structure guarantees that the compensating volume is precisely positioned and dimensioned, achieving high manufacturing precision while reducing the number of separate components.
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 enhances the precision of the mobile phase composition, prevents undesired pressure pulses, and extends the lifespan of fluid valves by ensuring accurate solvent mixing and preventing reflow, thereby improving the reliability and performance of HPLC systems.
Implementation Method 1
an elastic buffer unit which is fluidically coupled upstream of the fluid valve with the supply conduit and which is configured for buffering the fluid
Implementation Method 2
an elastic buffer unit which is fluidically coupled upstream of the fluid valve with the supply conduit and which is configured for buffering the fluid
Implementation Method 3
a mixing unit for mixing the combined fluids and for providing the mixed fluids as mobile phase at a fluid outlet
Implementation Method 4
between the fluid valves and the combining position, a such dimensioned compensating volume is formed, that even in the case of a maximum fluid reflow from the fluid conveying unit in the direction of the fluid valves, reaching the fluid valves by the fluid reflow is made impossible due to the compensating volume
Data Source
AI summary
A fluid supply device for providing a mobile phase for a sample separating device includes, a supply conduit for providing a fluid which forms at least a part of the mobile phase, a fluid valve which is fluidically coupled with the supply conduit and, depending on its switching state, enables or prevents a passing of the fluid from the supply conduit, an elastic buffer unit which is fluidically coupled upstream of the fluid valve with the supply conduit and which is configured for buffering the fluid, and a fluid conveying unit for conveying the fluid which passes the fluid valve.