Ultrasonic Flow Meter Layout With Integrated Flow Deflection
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Solution Overview
Problem
Ultrasonic flow meters are sensitive to deviations from calibration conditions due to features like bends, constrictions, and valves in the pipe, leading to reduced accuracy in flow measurement.
Innovation Solution
The ultrasonic meter design includes two or more pairs of ultrasonic transducers with beam paths making non-zero angles and a flow deflecting member that overlaps the intersection of these paths, deflecting fluid flows to stabilize the measurement region, reducing sensitivity to flow deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If flow conditioners are placed upstream of the ultrasonic meter to improve velocity profile predictability, then measurement accuracy is improved, but device complexity and installation space requirements increase
Solution Approach 1:
The invention extracts the flow conditioning function from a separate upstream device and integrates it into the ultrasonic meter housing itself. The housing includes an oblique surface that deflects fluid flow to create a more uniform velocity profile at the measurement location, eliminating the need for separate flow conditioner devices and reducing installation complexity
Solution Approach 2:
The ultrasonic meter housing serves multiple functions: it provides structural support for the transducers, contains the measurement chamber, and acts as a flow conditioner through its oblique surface feature. This multi-functionality reduces the number of separate components needed and simplifies installation
2Measurement precision
If a sufficiently long straight section of pipe is used to ensure predictable velocity profile, then measurement accuracy is improved, but installation flexibility and location options are reduced
Solution Approach 1:
The oblique surface in the housing pre-conditiones the fluid flow before it reaches the ultrasonic measurement beams. By deflecting the flow upstream within the housing, the velocity profile is adjusted in advance to be more uniform at the measurement location, compensating for upstream disturbances without requiring long straight pipe sections
Solution Approach 2:
The invention addresses the flow profile issue by introducing a geometric dimension (the oblique surface angle) rather than requiring extended axial length. The housing is positioned at a specific angle to the pipe axis, creating a flow deflection effect that achieves profile correction in a compact space rather than requiring long straight sections
3Measurement precision
If multiple beam paths with intersections are used to sample more fluid, then measurement representativeness is improved, but sensitivity to flow profile deviations increases
Solution Approach 1:
The oblique surface creates a localized flow deflection effect specifically at the measurement region where the ultrasonic beams pass. This targeted flow conditioning improves the velocity profile quality in the critical measurement zone without disturbing the overall flow pattern, thereby maintaining measurement representativeness while reducing sensitivity to upstream profile deviations
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 enhances the meter's accuracy by stabilizing the flow profile, minimizing the impact of pipe irregularities and improving measurement precision.
Implementation Method 1
measure a flow velocity/speed of a liquid or gas based on time-of-flight measurements
Implementation Method 2
a pair of ultrasonic transducers may be arranged spaced apart along the length of a flow tube
Implementation Method 3
a flow deflecting member supported between the first opening and the measurement region... acts to deflect fluid flows which would be sampled by the first beam path and the second beam path
Data Source
AI summary
An ultrasonic meter (44) is described for measuring a flow-rate of a fluid, including a flow conduit (5) for the fluid. The flow conduit (5) extends along a first axis (6) 5 between a first opening (7) and a second opening (8). The ultrasonic meter (44) also includes two or more pairs of ultrasonic transducers (2, 3). Each pair of ultrasonic transducers (2, 3) is configured to define a corresponding beam path (9) intersecting the flow conduit (5) within a measurement region (13) of the flow conduit (5). Substantially every part of each beam path (9) makes a non-zero angle with the first 10 axis (6). When viewed projected onto a plane perpendicular to the first axis (6), a projection of a first beam path (91) intersects (25) a projection of a second beam path (92). The ultrasonic meter (44) also includes a flow deflecting member (26) supported between the first opening (7) and the measurement region (13). When viewed projected onto the plane perpendicular to the first axis (6), a projection of the flow 15 deflecting member (26) at least partially overlaps the intersection (25) of the projections of the first and second beam paths (91, 92).