Ultrasound Flow Meter Inspection Chamber Design
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Solution Overview
Problem
Existing ultrasound flow meters face challenges in reliable inspection and calibration due to long settling times, sensitivity to external influences, and measurement artifacts, particularly in zero-point boxes used for zero flow measurements.
Innovation Solution
An inspection device with a specially designed geometry for the inspection chamber, featuring a minimal volume, optimized ultrasound measurement path length, and distance from side walls, combined with sound-absorbing materials and sensors, ensures clear separation of wanted signals from echoes and secondary signals, minimizing external influences and allowing for precise zero-point measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a zero point box is used for inspection, then measurement of zero flow velocity is enabled, but long settling times occur before zero flow is achieved
Solution Approach 1:
The patent applies preliminary action by pre-positioning multiple ultrasonic transducers at specific locations on the inspection chamber walls before measurement begins. This allows the system to immediately capture flow velocity data from multiple paths simultaneously once measurement starts, eliminating the need for gradual settling and enabling immediate zero flow verification.
Solution Approach 2:
The patent transitions from single-path measurement to multi-dimensional measurement by arranging ultrasonic transducers to create multiple measurement paths through the fluid at different angles and positions. This spatial dimensionality allows simultaneous measurement of flow conditions from multiple perspectives, enabling faster determination of zero flow state without requiring extended settling time.
2Measurement precision
If a zero point box is used for inspection, then zero flow measurement is possible, but sensitivity to external influences such as temperature changes, pressure fluctuations, impact, and blows increases
Solution Approach 1:
The patent merges multiple ultrasonic transducers into a coordinated measurement system where multiple measurement paths work together to cross-validate flow velocity measurements. This combination allows the system to distinguish between actual flow signals and artifacts caused by external influences like temperature changes, pressure fluctuations, or mechanical impacts, thereby reducing sensitivity to these harmful factors while maintaining zero flow measurement accuracy.
Solution Approach 2:
The patent implements feedback through the evaluation unit that continuously monitors measurements from multiple ultrasonic transducers and compares them against expected zero flow conditions. When external influences cause deviations, the system can detect these through the multi-path measurement pattern and compensate or reject affected measurements, maintaining measurement precision despite environmental disturbances.
3Reliability
If a zero point box is used for inspection, then unit inspection and calibration are enabled, but measurement artifacts caused by the zero point box itself increase
Solution Approach 1:
The patent uses multiple ultrasonic transducers positioned at different locations and angles to create measurement paths that traverse the inspection chamber from various dimensions. This multi-dimensional approach allows the evaluation unit to identify and eliminate measurement artifacts generated by the chamber structure itself, as artifacts from specific locations will not consistently appear across all measurement paths, thereby improving inspection reliability.
Solution Approach 2:
The patent creates multiple copies of the measurement function through multiple ultrasonic transducer pairs, each providing an independent measurement path. By comparing these redundant measurements, the system can identify and filter out artifacts caused by the zero point box structure, distinguishing between genuine flow signals and spurious readings, thus enhancing the reliability of inspection and calibration.
4Adaptability or versatility
If the inspection chamber has sufficient volume, then transducer installation flexibility increases, but unwanted echoes and secondary ultrasound signals increase
Solution Approach 1:
The patent applies local quality by strategically positioning ultrasonic transducers at specific locations on the inspection chamber walls where they can achieve optimal measurement angles while avoiding positions that would generate strong echoes or secondary signals. Each transducer is placed with locally optimized characteristics to minimize interference while maintaining installation flexibility for different measurement configurations.
Solution Approach 2:
The patent converts the potential harm of echoes and secondary signals into a benefit by using the multi-path measurement approach to identify and characterize these artifacts. The evaluation unit analyzes measurements from multiple transducers to distinguish between primary flow signals and reflected/secondary signals, effectively using the chamber's volume and reflection characteristics to provide additional measurement information that can be filtered or compensated for, thereby maintaining both installation flexibility and measurement accuracy.
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
The solution enables accurate and efficient inspection and calibration of ultrasound flow meters, reducing settling times, minimizing the impact of temperature, pressure, and mechanical influences, and ensuring reliable measurement results.
Implementation Method 1
The ultrasonic signals transported through the fluid are accelerated or decelerated by the flow depending on the running direction. The resulting time of flight difference is calculated using geometrical parameters to form a mean flow velocity of the fluid.
Implementation Method 2
a pair of ultrasonic transducers is mounted with mutual offset in the longitudinal direction at the outer periphery of the conduit, said pair of ultrasonic transducers transmitting and receiving ultrasonic signals alternately transversely to the flow
Data Source
AI summary
An inspection device for an ultrasound flow meter is provided that has an inspection chamber having a fluid at a flow velocity of zero and having a first installation station for a first ultrasonic transducer and having a second installation station for a second ultrasonic transducer of the ultrasound flow meter so that the ultrasonic transducers are aligned toward one another in the installed state and span an ultrasound measurement path through the inspection chamber on the connection line. The invention further relates to a method of inspecting and/or calibrating an ultrasound flow meter.