Magnetic Flow Reference System for Low Friction Measurement
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Solution Overview
Problem
Existing fluid flow measurement devices require calibration but face challenges in accurately measuring flowrates due to friction and back pressure issues, which affect the precision and reliability of measurements.
Innovation Solution
The system employs a slidable element, such as a piston, within an enclosure with low friction seals and actuators like linear actuators or stepper motors to minimize friction, allowing for precise movement and maintaining desired pressures, enabling accurate calculation of volumetric and mass flowrates using sensors and a control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a slidable element is used to measure flowrate, then measurement precision is improved, but friction between the slidable element and enclosure walls increases, affecting accuracy
Solution Approach 1:
The patent replaces direct mechanical contact between the slidable element and enclosure walls with a magnetic field-based actuation system. Magnets positioned in the enclosure walls generate magnetic fields that interact with magnets embedded in the slidable element, enabling movement control without physical contact. This eliminates friction while maintaining precise measurement capability.
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the control system and the slidable element. Magnets in the enclosure walls serve as intermediaries to transmit force without direct mechanical contact, allowing the slidable element to be actuated and positioned accurately while avoiding frictional losses.
2Measurement precision
If the slidable element moves to maintain desired pressure, then flowrate measurement accuracy is improved, but back pressure on the unit under test increases
Solution Approach 1:
The patent employs a dynamic control system that continuously adjusts the position of the slidable element based on real-time pressure feedback. The system maintains desired pressure conditions by making incremental adjustments, allowing the measurement to be taken at minimal back pressure while ensuring accuracy through active pressure compensation.
Solution Approach 2:
The patent incorporates pressure sensors that continuously monitor the pressure within the enclosure and feed this information back to the control system. Based on this feedback, the system adjusts the slidable element position to maintain the desired pressure setpoint, thereby measuring flowrate accurately while minimizing back pressure on the unit under test.
3Measurement precision
If low friction seals are used, then friction is reduced improving measurement accuracy, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical seals with magnetic coupling mechanisms that eliminate the need for physical seals between moving parts and the enclosure. The magnetic field-based actuation and positioning system allows the slidable element to move without mechanical contact, thereby eliminating seal friction and leakage issues while avoiding the complexity of seal maintenance and replacement.
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 approach allows for accurate measurement of flowrates from 0.01 to 100 liters per minute with 0.1% accuracy, minimizing back pressure impact on the unit under test and enabling both volumetric and mass flowrate calculations with reduced friction and leakage.
Implementation Method 1
The pressure of the fluid within the cavity may be measure and a slidable element located within the cavity may be repositioned to maintain a desired pressure within the cavity
Implementation Method 2
The pressure of the fluid within the cavity may be measure
Data Source
AI summary
Disclosed are systems and methods for measuring flowrates. The systems and methods may include passing a fluid from a unit under test into a cavity. The pressure of the fluid within the cavity may be measure and a slidable element located within the cavity may be repositioned to maintain a desired pressure within the cavity. The distance traveled by the slidable element in order to maintain the desired pressure may be determined along with a time for the slidable element to travel the distance. Using the distance traveled by the slidable element, a crosssectional area of the slidable element in contact with the fluid, and the time for the slidable element to travel the distance the volumetric flowrate for the fluid may be determined.