Pressure Vessel Dosing Device for Precision Liquid Control
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Solution Overview
Problem
Existing dosing devices for precise dispensing of small liquid quantities generate significant plastic waste and lack flexibility in dosing quantities while maintaining precision.
Innovation Solution
A dosing device utilizing a pressure vessel with a pressurizing gas to create a pressure differential, allowing for precise movement of a first medium towards or away from a dosing tip, eliminating the need for a pump and reducing waste by enabling reusable components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disposable parts are used to avoid contamination, then reliability is improved, but loss of substance increases due to plastic waste
Solution Approach 1:
The system separates the disposable component (dosing tip) from the reusable components (pump, flow meter, pressure vessel). Only the dosing tip that直接接触 the liquid medium is disposable, while the expensive pump and measurement components are reusable, reducing plastic waste while maintaining contamination avoidance.
Solution Approach 2:
A replaceable intermediate component (dosing tip) is introduced between the reusable pump system and the liquid medium. This intermediate element can be disposed of to prevent contamination, while the main system remains reusable.
2Productivity
If a pump is used for liquid transport, then productivity is improved, but device complexity increases
Solution Approach 1:
The mechanical pump system is replaced with a pressure-based system using a pressure vessel and pressure regulator. This substitution eliminates complex mechanical moving parts while maintaining liquid transport capability, reducing device complexity and potential failure points.
Solution Approach 2:
The system uses pneumatic pressure (gas pressure in the pressure vessel) to drive liquid transport instead of mechanical pump action. The pressure regulator controls the gas pressure to achieve precise liquid delivery without complex mechanical components.
3Manufacturing precision
If fixed pressure is used for dosing, then manufacturing precision is improved, but adaptability decreases
Solution Approach 1:
The system transitions from fixed pressure to dynamically adjustable pressure through the pressure regulator. The pressure can be varied to adapt to different dosing requirements while maintaining precision through controlled pressure adjustment and measurement.
Solution Approach 2:
The pressure parameter is made variable through the pressure regulator, allowing the system to adapt to different dosing quantities and conditions. The flow meter simultaneously measures the actual liquid delivery to maintain dosing precision across different pressure settings.
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 device achieves precise dosing with reduced waste and increased flexibility in dosing quantities, as it can operate with both overpressure and negative pressure to aspirate and dispense liquids contactlessly.
Implementation Method 1
an internal pressure can be set by a pressure regulator to a predefined pressure setpoint value, which is an overpressure or a negative pressure relative to an environment of the dosing device, the internal pressure set by means of the pressurizing gas acting on a first liquid medium
Data Source
AI summary
A dosing device has a dosing tip for dispensing liquid medium and at least one pressure vessel with a pressurizing gas, in which an overpressure or a negative pressure can be set as a predefined pressure setpoint value of an internal pressure by a pressure regulator, wherein the internal pressure is set by the pressurizing gas acting on a first liquid medium. A bidirectional flow meter is provided to measure a quantity of the first medium that is moved by the internal pressure prevailing in the pressure vessel. Furthermore, a dosing valve is provided upstream of the dosing tip, which is adapted to enable or disable a flow of the first medium from the flow meter to the dosing tip. For precise dosing, the first medium is moved by a change in the predefined pressure setpoint value of the internal pressure of at least one pressure vessel, and the moved quantity of the first medium is measured by the flow meter.