Dispenser Pre-Metering Chamber Segmentation for Precision Dosing
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Solution Overview
Problem
Existing liquid dispensers lack a simple and reproducible dosing mechanism, especially under constant liquid pressure, which makes precise and consistent dispensing of liquids challenging.
Innovation Solution
A dispenser design featuring a dosing device with a pre-metering chamber and a main metering chamber, connected via an intermediate channel, where the pre-metering chamber isolates liquid from the reservoir and uses a spring device to control the flow into the main chamber, allowing for precise volume reduction and discharge through a discharge opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple dosing device is used, then device complexity is reduced, but dosing precision and reproducibility deteriorate
Solution Approach 1:
The dosing device is segmented into two distinct chambers: a pre-dosing chamber for initial liquid intake and a main dosing chamber for precise metering. This segmentation allows each chamber to perform its specific function optimally, achieving reproducible dosing without excessive structural complexity
Solution Approach 2:
The pre-dosing chamber acts as an intermediary between the liquid reservoir and the main dosing chamber. It temporarily stores liquid and isolates it from the reservoir, enabling controlled transfer to the main chamber for precise dosing, thereby improving dosing precision while maintaining relatively simple device structure
2Productivity
If a dosing device is provided under permanent liquid pressure, then productivity is improved, but dosing precision deteriorates
Solution Approach 1:
By dividing the dosing device into pressure-resistant pre-dosing chamber and precision main dosing chamber, the system can withstand permanent liquid pressure while maintaining dosing precision. The segmented structure allows pressure management in the pre-dosing chamber without affecting the main dosing chamber's precision
Solution Approach 2:
The pre-dosing chamber serves as a pressure buffer and intermediary, absorbing the effects of permanent liquid pressure before liquid enters the main dosing chamber. This isolation protects the precision dosing function from pressure fluctuations, enabling both high productivity and dosing precision
3Measurement precision
If liquid is isolated in the pre-dosing chamber, then dosing precision is improved, but device complexity increases
Solution Approach 1:
The pre-dosing chamber and main dosing chamber are merged into a single integrated dosing device with shared walls and coordinated movable walls. This merging achieves precise dosing through liquid isolation while avoiding the complexity of completely separate systems, as the chambers work together as one unit
Solution Approach 2:
The movable walls separating and defining the chambers are designed as flexible elements that can change volume in coordination. This flexibility allows precise volume control for dosing precision while using thin, simple structural elements rather than complex rigid mechanisms
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
Enables reproducible and precise dispensing of defined liquid amounts, suitable for various applications including pharmaceuticals, cosmetics, and food, with a modular design adaptable to different pressures and volumes, ensuring consistent delivery.
Implementation Method 1
a spring device (40) is provided, by which the operatively coupled, movable walls of the pre-dosing chamber and the main dosing chamber are permanently subjected to a force in the direction of action of a volume reduction in the pre-dosing chamber and an increase in volume of the main dosing chamber
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A dispenser (10) for dispensing liquids is known. The dispenser has a liquid reservoir (12) for storing the liquid before dispensing and a discharge opening (38) through which the liquid can be released into an environment. It further has a metering device (20) for dispensing a defined quantity of liquid in response to actuation of the dispenser (10), wherein the metering device is connected to the liquid reservoir (12) on the inlet side and to the discharge opening (38) on the outlet side. It is proposed that the metering device (20) has a pre-metering chamber (26) which is connected to the liquid reservoir (12) via a feed channel (22) and a main metering chamber (32) which is connected to the pre-metering chamber (26) via an intermediate channel (28) and to the discharge opening (38) via a discharge channel (34).The pre-dosing chamber (26) and the main dosing chamber (32) each have a movable wall (26A, 32A) whose displacement allows the respective chamber volume to be changed. The movable walls (26A, 32A) of the pre-dosing chamber (26) and the main dosing chamber (32) are coupled such that an increase in the volume of the pre-dosing chamber (26) causes a decrease in the volume of the main dosing chamber (32).