Dosing Device 3-Way Valve Pneumatic Flow Control
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Solution Overview
Problem
Existing dosing devices, such as syringe pumps and peristaltic pumps, are not accurate enough for precise dosing of high-quality or aggressive media, and they often suffer from pneumatic back pressure issues that can lead to deposits or crystallizations due to incomplete flushing.
Innovation Solution
A dosing device with a 3-way valve and a ring line configuration that uses different flow resistances in the inflow and backflow channels to ensure complete flushing, preventing deposits and crystallizations, and allows for accurate and continuous dosing with a simple construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single 3-way valve is used for both inflow and backflow channels, then device complexity is reduced, but reliable operation becomes difficult to ensure
Solution Approach 1:
The patent segments the flow control function by providing separate orifices for inflow and backflow within the dosing chamber, while using a single 3-way valve to control both channels. This segmentation of flow paths ensures that dosing fluid flows through distinct routes during filling and ejection phases, preventing cross-contamination and ensuring reliable operation despite using fewer valves.
Solution Approach 2:
The 3-way valve serves multiple functions by controlling both the inflow channel and backflow channel. By positioning the valve to selectively connect the dosing chamber to either the inflow source or the backflow outlet, a single component performs what would traditionally require multiple valves, simplifying the device while maintaining reliable dosing control.
2Ease of manufacture
If inflow and backflow orifices coincide in the dosing chamber, then construction is simplified, but flushing becomes insufficient leading to deposits and crystallizations
Solution Approach 1:
The patent applies local quality by positioning the inflow orifice and backflow orifice at different locations within the dosing chamber. This spatial differentiation ensures that dosing fluid enters and exits through distinct points, creating effective flow circulation that thoroughly flushes the chamber and prevents deposit formation, while the channels themselves can be constructed with simple geometries.
Solution Approach 2:
The dosing device performs preliminary flushing action by directing backflow through a dedicated backflow channel that originates from the dosing chamber. This preliminary circulation of fluid through the chamber before each dosing cycle prevents deposits and crystallizations from forming, ensuring reliable operation over extended periods.
3Measurement precision
If syringe pumps are used for precise dosing, then dosing accuracy is improved, but device cost and complexity increase due to electronic actuation
Solution Approach 1:
The patent replaces electronic actuation systems with a purely mechanical pneumatic system. A 3-way valve controlled by pneumatic pressure differentials directs fluid flow through the dosing chamber, eliminating the need for electronic motors, sensors, and control circuits while maintaining precise dosing capability through controlled fluid admission and ejection phases.
Solution Approach 2:
The dosing device uses pneumatic principles to control fluid flow and achieve precise dosing. By applying pneumatic pressure to admit dosing fluid into the chamber and then releasing pressure to eject the fluid through the backflow channel, the system achieves accurate volume control without electronic components, reducing both cost and complexity.
4Device complexity
If peristaltic or diaphragm pumps are used, then device construction is simplified, but dosing accuracy becomes insufficient for high-quality media
Solution Approach 1:
The patent segments the dosing chamber into distinct inflow and backflow regions with separate orifices and channels. This segmentation allows precise control of fluid admission and ejection volumes, enabling accurate dosing while maintaining a simple pumpless construction that avoids the complexity of peristaltic or diaphragm pumps.
Solution Approach 2:
The dosing device performs self-dosing through its own internal fluid dynamics. The 3-way valve and spaced orifices create a self-regulating system where dosing fluid is admitted and ejected based on pressure differentials and flow resistance, eliminating the need for external pump mechanisms while achieving sufficient dosing accuracy for high-quality media.
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 ensures reliable and accurate dosing over an extended period with minimal constructional expenditure, preventing back pressure issues and maintaining device cleanliness, thus enhancing the precision and longevity of the dosing device.
Implementation Method 1
a 3-way valve (12) which has one port each for the inflow (10) and the backflow (18) and a common port (20) for the inflow and the backflow channel
Implementation Method 2
a dosing chamber unit (22) receiving dosing fluid and actively ejecting dosing fluid, in particular in which in the dosing chamber unit the dosing fluid is ejected by applying a pneumatic pressure
Implementation Method 3
inflow and backflow orifice are spaced from each other
Data Source
AI summary
A dosing device with a dosing chamber unit receiving dosing fluid and actively ejecting dosing fluid, which includes at least one dosing chamber, an inflow channel which fluidically connects a dosing chamber with an inlet and in an inflow orifice opens into the dosing chamber, and a backflow channel which fluidically connects the or a dosing chamber with a backflow and which in a backflow orifice proceeds from the associated dosing chamber, is able to exactly eject minimum amounts of fluid. Inflow and backflow orifice are spaced from each other. A 3-way valve is provided with a common port for the inflow and the backflow channel.