Ultrasonic Flowmeter Layout for Vortex-Resistant Flow Sensing
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Solution Overview
Problem
Ultrasonic flowmeters face inaccuracies in flow measurement due to bends or cross-sectional changes in the measuring tube, which cause irregularities in the flow profile and generate vortices that affect radial and tangential velocity components.
Innovation Solution
The ultrasonic flowmeter features a measuring tube with non-parallel signal paths defined by ultrasonic transducer pairs arranged on different halves of the tube, allowing signals to be sent from different directions to minimize the impact of vortices and accurately measure flow velocities even in areas with changing cross-sectional shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic transducers are arranged in parallel signal paths in a conventional ultrasonic flowmeter, then the device structure is simple and easy to manufacture, but measurement precision deteriorates due to vortices and irregular flow profiles caused by bends or cross-sectional changes
Solution Approach 1:
The patent applies asymmetry by arranging the first and second ultrasonic transducer pairs at different angular positions around the measuring tube, with their signal paths forming non-parallel orientations. This asymmetric arrangement allows the measurement planes to intersect, enabling the system to filter out radial and tangential velocity components caused by vortices, thereby improving flow measurement accuracy in turbulent or irregular flow conditions without requiring excessive structural complexity
Solution Approach 2:
The patent transitions from a conventional parallel signal path arrangement to a three-dimensional configuration where the first and second signal paths form intersecting measurement planes at different angular positions. This dimensional change allows the ultrasonic waves to traverse the flow medium from multiple angles, enabling the system to differentiate between axial flow components and radial/tangential vortex components, thus improving measurement precision
2Adaptability or versatility
If the measuring tube has bends or cross-sectional changes, then the flowmeter can adapt to different installation conditions, but measurement precision deteriorates due to generated vortices affecting radial and tangential velocity components
Solution Approach 1:
The patent converts the harmful effect of vortices and irregular flow profiles into a beneficial measurement capability. By arranging the ultrasonic transducers to create intersecting measurement planes, the system can detect and filter out radial and tangential velocity components caused by vortices, transforming the previously harmful flow irregularities into useful information for improving measurement accuracy in turbulent or disturbed flow conditions
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 design ensures reliable and accurate flow measurement by filtering out radial and tangential velocity components, reducing errors in turbulent or laminar flow profiles, and improving the functionality of shut-off devices.
Implementation Method 1
at least one first ultrasonic transducer pair (3, 4) comprising a first ultrasonic transducer (3) and a second ultrasonic transducer (4) and with at least one second ultrasonic transducer pair (5, 6) comprising a third ultrasonic transducer (5) and a fourth ultrasonic transducer (6), wherein each ultrasonic transducer (3, 4, 5, 6) is designed as an ultrasonic transmitter and/or as an ultrasonic receiver
Implementation Method 2
To measure the flow rate, an ultrasonic signal is transmitted along the signal path between the ultrasonic transducers both in the direction of flow and against the direction of flow. Due to the entrainment effect, there is a different transit time from the signals moving along a signal path with or against the flow.
Data Source
AI summary
An ultrasonic flowmeter includes a measuring tube, a first transducer pair including first and second ultrasonic transducers, and a second transducer pair including third and fourth ultrasonic transducers. Each ultrasonic transducer is an ultrasonic transmitter and/or an ultrasonic receiver. The first transducer pair is on the measuring tube offset such that the respective transmitter transmits an ultrasonic signal in or against the direction of flow, and the receiver receives the ultrasonic signal. A course of the ultrasonic signal between the first and second ultrasonic transducers defines a first signal path. The second transducer pair is on the measuring tube offset such that the respective transmitter transmits an ultrasonic signal in or against the direction of flow. The receiver receives the ultrasonic signal transmitted by the transmitter. A course of the ultrasonic signal between the third and fourth ultrasonic transducers defines a second signal path.