Pressure-Released Coupling in Flow-Through Devices for Ultrasonic Measurement
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Solution Overview
Problem
Existing flow measurement devices, particularly clamp-on flow meters, face challenges in achieving accurate signal transmission due to gas phases in the signal path, which are caused by cavities filled with ambient air between contact surfaces, leading to suboptimal detection of fluid variables.
Innovation Solution
A flow device with contact surfaces that secrete a coupling agent when pressure is applied, ensuring improved signal transmission by replacing gas phases with a liquid phase, particularly using ultrasonic signals, and utilizing materials like styrene block copolymers and polybutylene terephthalate for the flow measuring device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If clamp-on flow meters are used with cavities filled with ambient air between contact surfaces, then the device structure is simple, but signal transmission is poor due to gas phases
Solution Approach 1:
A coupling agent is introduced as an intermediary substance between the contact surfaces and the flow measuring device. This coupling agent displaces gas phases (ambient air) in the signal path and provides a liquid phase medium that improves ultrasonic signal transmission. The coupling agent is stored in a reservoir and applied to the contact surfaces through a dispensing mechanism when needed.
2Reliability
If contact surfaces are designed to be simple and rigid, then manufacturing is easy, but contact pressure application is insufficient for coupling agent secretion
Solution Approach 1:
The contact surfaces are designed with elastic properties that allow them to deform under contact pressure. This elastic deformation enables the contact surfaces to apply sufficient pressure to the coupling agent, causing it to secret from the reservoir and fill the signal path. The elastic material properties are carefully selected to provide the necessary pressure while maintaining manufacturability.
3Measurement precision
If the flow device is made compact to reduce space, then installation is easier, but contact surfaces cannot be sufficiently large for good signal transmission
Solution Approach 1:
The coupling agent reservoir is nested within the flow device housing, and the contact surfaces are arranged to extend along the flow path in a compact configuration. The measuring region is integrated into the flow device structure, allowing the contact surfaces to be sufficiently large for good signal transmission while keeping the overall device volume compact for easy installation.
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
Enhances signal transmission and improves the accuracy of flow measurements by displacing gas phases with a liquid coupling agent, resulting in better detection of fluid variables such as volume or mass flow.
Implementation Method 1
the at least two contact surfaces are designed to secrete a coupling agent when a contact pressure is applied
Implementation Method 2
a flow measuring device, in particular an ultrasonic flow measuring device, for detecting the measured variable
Data Source
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AI summary
The invention relates to a system for detecting a measurement variable of a fluid being conducted in a fluid-conducting line, said system having: - a flowmeter, in particular an ultrasonic flow meter, for detecting the measurement variable, - a flow-through device (10) for arranging on the fluid-conducting line and for attaching the flowmeter for detecting the measurement variable of the fluid being conducted by the line, said flowmeter having: - a first and second connection (12, 14), by means of which the flow-through device (10) can be connected to the fluid-conducting line, and - a measurement region (16) which is arranged between the first connection (12) and the second connection (14) and which can be coupled to the flowmeter for detecting the measurement variable, wherein the first connection (12), the measurement region (16), and the second connection (14) define a flow path (A) for the fluid through the flow-through device (10), and the measurement region (16) has at least two contact surfaces (20), which extend at least partly along the flow path (A), for contacting the flowmeter. The at least two contact surfaces (20) are designed to separate a coupling means under the effect of a pressing force, and the flowmeter is designed so as to exert at least the pressing force onto the at least two contact surfaces (20) by means of a coupling of the flowmeter to the measurement region (16). The invention additionally relates to a flow-through device and to a use thereof.