Inductor Arrangement Detects Stirring Bar Rotation for Flow Rate
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Solution Overview
Problem
Existing chemical analysis systems face challenges in efficiently measuring fluid flow rates within measuring cells due to the size, cost, and integration difficulties of traditional flow meters.
Innovation Solution
A flow measurement system utilizing a magnetic stirring bar and an inductor arrangement within the chemical analysis system, where the inductor arrangement detects a measuring signal induced by the movement of the magnetic stirring bar to determine fluid flow and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional flow meters (turbine or thermal) are used to measure fluid flow rate, then measurement accuracy is improved, but device size and cost increase significantly
Solution Approach 1:
The patent combines the flow measurement function with the existing electromagnetic stirring system by using the magnetic stirring bar as a flow-driven indicator. The inductor arrangement detects the rotation of the stirring bar caused by fluid flow, merging two functions (stirring and flow measurement) into a single integrated system without requiring separate flow meter hardware
Solution Approach 2:
The magnetic stirring bar serves dual purposes: it acts as both a stirring element for chemical analysis and a flow measurement indicator. The same component that mixes the fluid also indicates flow rate through its rotation, which is detected by the inductor arrangement. This multi-functionality eliminates the need for dedicated flow measurement devices
2Measurement precision
If traditional flow meters are integrated into the chemical analysis system, then flow rate measurement capability is improved, but manufacturing cost increases
Solution Approach 1:
The system uses its own existing components (magnetic stirring bar and inductor arrangement) to perform flow measurement. The magnetic stirring bar, already present for chemical mixing, automatically indicates flow rate through its rotation when driven by incoming fluid. This self-service approach eliminates the need for additional paid components
Solution Approach 2:
The inductor arrangement serves dual functions: it generates magnetic fields to drive the stirring bar for mixing purposes and simultaneously detects the stirring bar's rotation to measure flow rate. This multi-functionality reduces component count and manufacturing cost while maintaining measurement capability
3Reliability
If excessive flushing is performed to ensure adequate measurement cell cleaning, then reliability of chemical analysis is improved, but fluid consumption increases
Solution Approach 1:
The system uses real-time flow rate measurement feedback from the inductor arrangement to dynamically control the flushing process. When the measured flow rate indicates sufficient fluid velocity for effective cleaning, the system automatically terminates the flushing operation, preventing excessive fluid consumption while ensuring adequate cell cleaning
Solution Approach 2:
The patent replaces mechanical flow meter sensing with electromagnetic induction detection. The inductor arrangement detects the rotation of the magnetic stirring bar through electromagnetic induction, converting mechanical motion into an electrical signal that provides feedback for controlling flushing duration and optimizing fluid usage
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 efficient and real-time measurement of fluid flow rates without the need for additional flow sensors, reducing excess fluid consumption and minimizing wasted fluid during chemical analysis measurements.
Implementation Method 1
The at least one inductor of the inductor arrangement is configured to detect a measuring signal induced at the at least one inductor by the movement of the magnetic stirring bar
Implementation Method 2
The magnetic stirring bar is arrangeable in the measuring cell and configured to be driven into a movement by the fluid flowing into the measuring cell
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a flow measurement system (100) for a chemical analysis system, which comprises a measuring cell (10) comprising an inlet (180), a magnetic stirring bar (110) and an inductor arrangement (120) comprising at least one inductor (125). The measuring cell (10) may be configured for allowing a fluid flowing into the measuring cell (10) at a flow rate. The at least one inductor (125) of the inductor arrangement (120) is configured to detect a measuring signal induced at the at least one inductor (125) by the movement of the magnetic stirring bar (110) and indicative of a presence of the flow of the fluid and/or the flow rate of the fluid. The at least one inductor (125) of the inductor arrangement (120) may also be configured to generate a movement of the magnetic stirring bar (110) to agitate the fluid in the measurement cell (10).