Diffusion Tip Flute Geometry for Precise Titrant Dosing
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Solution Overview
Problem
Existing titration devices face challenges in accurately dosing small volumes of titrating agents while preventing sample fluid ingress and uncontrolled efflux, leading to measurement errors and clogging issues due to complex geometries and materials.
Innovation Solution
A diffusion tip with a flute design featuring non-intersecting, circumferentially offset flute sections and a sloping transverse section reduces pressure losses and clogging risks, enabling precise dosing by minimizing flow deflection angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a membrane one-way valve is used to prevent sample fluid ingress, then measurement accuracy is improved, but fine dosing capability in the microliter range is lost due to closing pressure
Solution Approach 1:
The invention removes the membrane one-way valve from the system and replaces it with a siphon-based passive valve mechanism integrated into the diffusion tip geometry. This extraction eliminates the closing pressure problem while maintaining prevention of sample fluid ingress.
Solution Approach 2:
The siphon mechanism acts as an intermediary between the need to prevent sample ingress and the need to enable fine dosing. It provides a passive, pressure-free valve action that allows microliter-range titrant delivery while still preventing sample fluid from entering the hose.
2Manufacturing precision
If a circular glass siphon loop is used to prevent uncontrolled efflux, then dosing precision is improved, but device complexity and fragility increase
Solution Approach 1:
The invention segments the siphon function into a simplified geometric configuration within the diffusion tip body, using multiple flute sections arranged to create the siphon effect without requiring a complete circular loop. This reduces manufacturing complexity and material usage.
Solution Approach 2:
Instead of using a traditional circular glass siphon loop that requires the sample to rise vertically, the invention inverts the approach by using sloping transverse flute sections that guide flow more efficiently, reducing the need for complex vertical arrangements and minimizing pressure losses.
3Reliability
If 180° bends are used in the siphon passage, then siphon effect is achieved, but pressure losses increase and clogging risk rises
Solution Approach 1:
The invention replaces sharp 180° bends with smoothly curved transitions in the flute sections. The circumferentially offset arrangement with sloping transverse sections creates gradual flow direction changes, reducing turbulence and pressure losses while maintaining the siphon effect.
Solution Approach 2:
The invention changes the geometric parameters of the flow path by using sloping transverse flute sections instead of vertical 180° bends. This modifies the flow dynamics to reduce pressure losses and clogging risk while preserving the essential siphon functionality.
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 flute design allows for precise dosing of titrating agents with reduced pressure losses and clogging, enhancing measurement accuracy and reliability.
Implementation Method 1
it was proposed in the Titrator DL 40 apparatus produced by Mettler Instrumente AG, to provide the diffusion tip with a siphon in the form of a circular glass loop. Owing to the known siphon principle, this apparatus has the effect of permitting a precisely defined limited quantity of a specimen having a lower specific density than that of the titrating agent to enter the upper circle arc of the siphon loop.
Implementation Method 2
If the titration agent has a specific density greater than that of the sample, owing to the density difference, the sample liquid will enter the siphon-shaped passage and, owing to the siphon effect, the boundary surface between the sample liquid and the titration agent will form in the vertically ascending section.
Data Source
Figure 1a~2
Figure 3~5
AI summary
Disclosed is a diffusion tip (1) for a titration line (2) comprising a body (11) having a proximal end (111) and a distal end (112) and a circumferential surface. A flute (12) is provided in the circumferential surface of the diffusion tip body (11). The flute has a proximal end and a distal end. The flute (12) further has a first, proximal flute section (121) extending from the proximal end of the flute to a distal end of the first flute section. The distal end of the first flute section is proximal from the distal end of the body (11). The flute (12) has a second flute section (122) extending from a proximal end to the distal end of the flute. The proximal end of the second flute section (122) is distal from the proximal end of the body (11) and proximal from the distal end of the first flute section (121). The first flute section and the second flute section do not intersect. The flute further has a transverse flute (123) section connecting the first flute section (121) and the second flute section (122). The transverse flute section (123) joins into the first flute section (121) and into the second flute section (122), wherein the transverse flute section (123) joins the first flute section (121) at a first proximal-distal position of the diffusion tip body and the transverse flute section joins the second flute section at a second proximal-distal position of the diffusion tip body, wherein the second proximal-distal position is proximal from the first proximal-distal position.