Gradient Pump Head Mixing Chamber Extension for Noise Reduction
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Solution Overview
Problem
Conventional gradient systems in liquid chromatography suffer from compositional noise due to insufficient mixing volume, particularly in low-pressure gradient systems, which can lead to inaccurate and non-reproducible gradient delivery and increased cycle time.
Innovation Solution
A gradient pump head with a mixing chamber extension that increases the delay volume to reduce compositional noise, either by attaching a mixing chamber extension to the pump head body or using a piston-controlled mixing chamber with an adjustable stroke length to optimize the mixing volume and minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-volume mixer is coupled to the output of the pump to reduce compositional noise, then mixing noise is reduced, but delay volume increases affecting gradient accuracy and cycle time
Solution Approach 1:
The mixing chamber extension is nested within the pump head body, integrating the mixing function directly into the pump structure. This eliminates the need for a separate external mixer while providing sufficient delay volume for effective mixing, thereby reducing compositional noise without adding external delay volume that would increase cycle time.
Solution Approach 2:
The mixing chamber extension merges the mixing function with the pump head structure. By extending the mixing chamber within the pump head rather than using a separate mixer, the system achieves effective solvent mixing with minimal additional delay volume, resolving the contradiction between noise reduction and cycle time.
2Reliability
If a large-volume mixer is added to reduce compositional noise, then mixing effectiveness is improved, but system complexity increases
Solution Approach 1:
The mixing chamber extension combines the mixing function with the existing pump head structure. This integration eliminates the need for a separate external mixer component, thereby improving mixing effectiveness while avoiding the increased system complexity that would result from adding another discrete component.
Solution Approach 2:
The pump head is designed to perform multiple functions: pumping and mixing. The mixing chamber extension enables the pump head to effectively mix solvents as part of its primary function, eliminating the need for a separate dedicated mixer and thereby reducing overall system complexity.
3Reliability
If the mixing chamber volume is increased to reduce compositional noise, then mixing quality is improved, but gradient delivery accuracy may be affected
Solution Approach 1:
The mixing chamber extension is nested within the pump head body, allowing the system to achieve increased mixing volume for better compositional noise reduction while maintaining a compact overall structure. This integrated design ensures that the extended mixing chamber does not create excessive delay volume that would compromise gradient delivery 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
The solution effectively reduces compositional noise to below the noise level threshold, ensuring accurate and reproducible gradient delivery in liquid chromatography systems by optimizing the mixing volume, thereby improving the performance of both high-pressure and low-pressure gradient systems.
Implementation Method 1
The pump head extension has a mixing chamber therein that has a first delay volume configured to mix the at least two fluids at a noise level
Implementation Method 2
a piston controlled by the pumping actuator, the piston extending through at least a portion of the mixing chamber. The gradient system further comprises a controller that moves the piston to a starting location in the mixing chamber
Data Source
AI summary
Described are a gradient system and method, wherein at least two fluids are mixed in accordance with a noise level threshold. An inlet receives the fluids. A pump head body has a mixing chamber therein in communication with the inlet. The mixing chamber has a first delay volume configured to mix the fluids having a noise level. A pump head extension has a mixing chamber extension therein extending from the mixing chamber. The mixing chamber extension increases the volume of the mixing chamber by a second delay volume to a third delay volume. The fluids are mixed in the third delay volume at a compositional noise level that is less than the noise level.