Pipetting Valve Bypass Channel Dampens Pump Pulsations
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Solution Overview
Problem
Existing pipetting devices struggle with precise dosing, especially with small-volume pipettes, due to pulsations from pump throttling and limited variability in pressure settings, making it difficult to maintain exact volume and requiring careful operator adjustments.
Innovation Solution
A pipetting device with a valve arrangement that includes a bypass channel connected to the environment, allowing for adjustable flow resistances in both the pipetting and bypass channels, which dampens pressure fluctuations and enables precise control of pipetting pressure independent of container size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pump output is throttled to achieve precise dosing, then the volume flow is limited, but the pump pulsations continue into the pipette causing intermittent dosing and making exact volume maintenance difficult
Solution Approach 1:
A bypass channel is introduced as an intermediary element between the pump chamber and the environment. This bypass channel provides an alternative flow path that absorbs pump pulsations before they reach the pipette, thereby maintaining dosing precision while eliminating volume inconsistency caused by pump throttling.
2Measurement precision
If throttle elements are added to limit volume flow in pressure lines, then dosing precision can be improved, but the system becomes severely limited in terms of variability and requires careful operator adjustments
Solution Approach 1:
The bypass channel serves multiple functions simultaneously: it limits volume flow for precise dosing, absorbs pump pulsations to ensure volume consistency, and provides adaptability for different pipetting scenarios without requiring separate throttle adjustments. This multi-functional design eliminates the need for operator adjustments while maintaining dosing precision across various conditions.
3Quantity of substance
If the pump power is reduced for small-volume pipettes, then the risk of overflow is reduced, but the pump pulsations have a stronger relative effect making precise metering difficult
Solution Approach 1:
The bypass channel acts as a mediator that dampens pump pulsations before they affect the pipette filling process. When pump power is reduced for small-volume pipettes, the bypass channel absorbs the relatively stronger pump pulsations, preventing them from causing metering errors while still allowing precise control of the small volume being transferred.
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 allows for precise metering of pipetting volume, reducing pump pressure pulsations and enabling accurate filling of small containers, even at low pump power, with adjustable settings for optimal pipetting performance.
Implementation Method 1
allowing for adjustable flow resistances in both the pipetting and bypass channels, which dampens pressure fluctuations
Data Source
Figure 1
Figure 2a~2c
Figure 2d~2e
AI summary
The pipetting device has valve arrangement (200) with valve device (101") for adjusting a pipetting pressure. The valve device has valve chamber with pump unit which is connected with the valve chamber for producing a chamber pressure in the valve chamber. A pipette and bypass channel (104") which is opened to environment are respectively connected to the valve chamber. The valve device is formed such that it is distributed to produce the desired pipetting pressure in the pipette and the chamber pressure on the pipette and the bypass channel. An independent claim is included for method for manufacturing pipetting device.