Torque Sensor Bioreactor Mixing Control
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Solution Overview
Problem
Magnetic mixing technologies face challenges in accurately measuring and controlling power input and torque, especially in bioreactors, due to indirect determination methods and limited power transfer, which complicates fluid density and viscosity monitoring and detection of abnormalities during the mixing process.
Innovation Solution
A system utilizing a torque sensor to measure torque and calculate power, speed, and fluid properties, enabling real-time monitoring and control of the mixing process, including detection of abnormalities such as blockages and gas flooding, through a processor that provides feedback to adjust agitation and correct deficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic coupling is used to avoid mechanical sealing, then process safety and simplicity are improved, but torque and power measurement precision deteriorates
Solution Approach 1:
A magnetic coupling acts as an intermediary between the drive shaft and impeller, transferring torque magnetically without mechanical contact. This maintains process safety by eliminating seals while enabling indirect measurement of torque through the magnetic field interaction, resolving the contradiction between safety and measurement capability.
Solution Approach 2:
The patent replaces direct mechanical coupling with magnetic coupling to transfer power from drive shaft to impeller. This substitution eliminates mechanical seals improving safety, while torque is measured indirectly through magnetic field sensors rather than direct mechanical load cells, maintaining measurement precision without compromising safety.
2Device complexity
If magnetic coupling is used to eliminate shaft sealing, then device complexity is reduced, but power transfer capability deteriorates
Solution Approach 1:
The patent substitutes mechanical shaft sealing with magnetic coupling, eliminating complex sealing arrangements and reducing device complexity. The magnetic coupling provides sufficient power transfer for mixing applications while avoiding the reliability issues of mechanical seals in sterile environments.
Solution Approach 2:
The magnetic coupling serves as an intermediary power transmission mechanism that eliminates the need for mechanical seals. It transfers power through magnetic fields across a small air gap, providing adequate power transfer for bioreactor mixing while dramatically simplifying the device structure by removing sealing components.
3Device complexity
If indirect determination of power is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces indirect calculation methods with direct magnetic field-based torque sensing. Magnetic sensors measure the torque transmitted through the magnetic coupling, providing precise direct measurement of power delivered to the impeller without requiring complex calculation formulas or lookup tables, thus improving measurement precision while keeping the device relatively simple.
4Ease of operation
If magnetic coupling is used, then ease of operation is improved, but ability to detect abnormalities deteriorates
Solution Approach 1:
The patent implements feedback through magnetic sensors that continuously monitor torque and power delivery in real-time. This feedback system detects abnormalities such as excessive torque (indicating blockages) or insufficient power transfer (indicating flooding), enabling the control system to respond to and correct mixing process issues automatically while maintaining ease of operation.
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 accurate, real-time monitoring and control of power delivered to the fluid, continuous updates of fluid properties, and detection of abnormalities, enhancing the efficiency and reliability of the mixing process by directly measuring torque and speed, rather than relying on empirical methods.
Implementation Method 1
a drive that creates a magnetic field
Implementation Method 2
The magnetic mixing principle is especially advantageous when using completely closed vessels
Implementation Method 3
one or more sensors positioned with the system to detect the magnetic field or a magnetic flux
Data Source
AI summary
Embodiments of the method disclosed regard use of a torque sensor (e.g., transducer) and using the measured torque to detect the different fluid and mixing properties, conditions, and abnormalities in a mixing process. The torque produced in the mixing process relates to different fluid properties such as viscosity and density. It also relates to different mixing conditions such as presence of obstacles and changes or issues with gas sparging. Moreover, torque measurements enable determination of power transmitted to fluid by actual measurement, in contrast to using solely empirical impeller power number and speed, and allowing for actual mass transfer determination (i.e., gas transfer calculations).