Dual Pumplet Liquid Chromatography Pump for Smooth Flow
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Solution Overview
Problem
Existing liquid chromatography system pumps face challenges in delivering precision-metered smooth flow of liquids, especially at low flow rates and high pressures, while being compact, quiet, reliable, and easily maintainable.
Innovation Solution
A modular liquid pump design featuring two pumplet subassemblies with actuators and pump heads, coordinated by a controller to provide smooth flow at a command rate. Each subassembly alternates between active dispensing and refilling/standby operational stages to ensure continuous and precise liquid dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a single pump delivers liquid at high pressure and low flow rate, then pressure stability is improved, but flow precision and smoothness deteriorate due to pulsations and noise
Solution Approach 1:
The pump system is divided into two independent pumplet subassemblies that operate in parallel. Each subassembly contains its own actuator and pump head, allowing them to function as separate pumping units that can be coordinated to deliver smooth, precise flow at high pressure without the pulsations inherent in single-pump systems.
Solution Approach 2:
The controller coordinates the two pumplet subassemblies to operate in alternating cycles, where one subassembly dispenses liquid while the other refills and repressurizes. This periodic switching between subassemblies creates smooth, continuous flow by ensuring that one subassembly is always ready to take over, eliminating flow spikes and surges.
2Stress or pressure
If a pump is designed for high pressure operation, then pressure delivery is improved, but noise and operational disturbances increase
Solution Approach 1:
By segmenting the pump into two independent pumplet subassemblies, the system can distribute the high-pressure delivery task between two units. Each subassembly operates at lower individual pressure levels, reducing noise generation while collectively delivering the required high flow rates with minimal disturbance.
Solution Approach 2:
The coordinated operation of two pumplet subassemblies ensures continuous liquid dispensing without interruption. One subassembly is always in the dispensing phase while the other is refilling, eliminating the start-stop cycles and pressure fluctuations that generate noise and operational disturbances in single-pump systems.
3Measurement precision
If a pump provides smooth flow at low rates, then flow precision is improved, but device size and complexity increase
Solution Approach 1:
The pump system uses two compact pumplet subassemblies that can be integrated into a modular cartridge format. This segmentation allows for a compact overall design while maintaining the precision required for low-flow-rate operation through the coordinated alternating operation of the two small pumping units.
Solution Approach 2:
The periodic alternating operation of the two pumplet subassemblies enables smooth flow at low rates by ensuring that one subassembly is always ready to take over the dispensing task. This coordination mechanism achieves flow precision without requiring a single large, complex pump, as the two smaller units work together in a simplified modular architecture.
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 solution achieves continuous and precise liquid dispensing with minimal noise and drift, ensuring high reliability and ease of maintenance, while maintaining compactness and operational efficiency.
Implementation Method 1
two pumplet subassemblies, each comprising an actuator and a pump head; a controller adapted to coordinate operation of the two pumplet subassemblies to provide smooth flow at a command rate
Implementation Method 2
the controller switching the active dispensing operation from the active pumplet subassembly to the alternate and non-dispensing pumplet subassembly in which refilled liquid has been pressurized in the transitional repressurization operation in the alternate and non-dispensing pumplet subassembly to match active dispensing pressure
Data Source
AI summary
A liquid pump is described, including two pumplet subassemblies, each including an actuator and a pump head, and a controller adapted to provide smooth flow at a command rate. Each pumplet subassembly sequentially, cyclically, and repetitively operates (i) in a first operational active dispensing stage and (ii) in a refilling and transitional repressurization in a second operational non-dispensing standby stage. The controller switches the active dispensing operation from the active pumplet subassembly to the alternate and non-dispensing pumplet subassembly in which refilled liquid has been pressurized in the transitional repressurization operation in the alternate and non-dispensing pumplet subassembly to match active dispensing pressure of the active pumplet subassembly.