Ultrasonic Flowmeter Signal Paths for Vortex-Tolerant Measurement
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Solution Overview
Problem
Ultrasonic flowmeters in shut-off devices face inaccuracies due to bends or cross-sectional changes in the measuring tube, which cause irregularities in the flow profile, especially vortices that generate radial and tangential velocity components, affecting measurement accuracy, particularly at critical measurement sites.
Innovation Solution
The ultrasonic flowmeter employs at least two signal paths with different directions of rotation that share a common reflecting surface, allowing for the detection of flowing media with vortices by passing through them in opposite directions, effectively filtering out radial or tangential velocity components, and is designed with a measuring tube that can be curved or have varying cross-sectional areas to minimize vortex formation and measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic transducers are arranged on a straight measuring tube with standard signal paths, then the device structure is simple and easy to manufacture, but measurement accuracy deteriorates due to vortices and flow profile irregularities caused by bends or cross-sectional changes
Solution Approach 1:
The patent introduces a third spatial dimension by using reflected ultrasonic signals to create signal paths that traverse the flow channel in opposite rotational directions. Instead of simply arranging transducers linearly along the tube, the invention uses reflection surfaces to redirect signals in opposing directions (clockwise vs. counterclockwise), adding dimensional complexity to the signal propagation paths. This enables the system to differentiate and compensate for vortex-induced velocity components by comparing signals traveling in opposite rotational directions, thereby improving measurement accuracy without requiring complete redesign of the transducer arrangement.
2Measurement precision
If multiple reflecting surfaces are provided for each signal path, then measurement accuracy improves by detecting flow in opposite directions, but the number of components and device complexity increases
Solution Approach 1:
The patent merges the function of multiple reflecting surfaces into a single shared reflecting surface that serves both the first and second signal paths. Instead of providing separate reflecting surfaces for each signal path, the invention uses one common reflecting surface to redirect ultrasonic signals in opposite rotational directions. This consolidation reduces the total number of components while maintaining the ability to measure flow accurately by comparing signals traveling in opposite directions through the flow channel.
3Reliability
If the measuring tube is curved or has varying cross-section to minimize vortex formation, then flow profile irregularities are reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces mechanical modifications to the measuring tube (such as curving the tube or varying its cross-section) with an acoustic field-based solution. Instead of physically altering the tube geometry to minimize vortex formation, the invention uses reflected ultrasonic signals traveling in opposite rotational directions to detect and compensate for vortex-induced flow irregularities. This substitution maintains a simple, easily manufacturable straight tube design while achieving reliable measurements through sophisticated signal processing and opposing path analysis.
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 flow measurement by accurately determining the flow rate even in critical applications and when the flow cross-section changes, improving the functionality of the shut-off device by minimizing measurement errors caused by vortices and flow profile disturbances.
Implementation Method 1
Due to the entrainment effect, there is a different transit time from the signals moving along a signal path with or against the flow.
Implementation Method 2
the receiver receives the ultrasonic signal transmitted by the transmitter after at least one reflection, wherein at least one reflecting surface is provided
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 after a reflection. 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, and the receiver receives the ultrasonic signal after a reflection. A course of the ultrasonic signal defines a second signal path between the third ultrasonic transducer and the fourth ultrasonic transducer.