Ultrasonic Flow Meter Transducer Mounting for Signal Stability
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Solution Overview
Problem
Existing ultrasonic fluid flow meters face challenges such as signal loss due to fluid boundary wall effects, pressure head loss, and incompatibility with high-temperature and high-pressure conditions, particularly in industrial applications.
Innovation Solution
The ultrasonic fluid flow meter design features ultrasonic transducers arranged in facing alignment within the fluid conduit, supported by a mounting system with fluid apertures and a flow stabilizer, which minimizes signal loss and pressure head loss while maintaining stability and accuracy across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ultrasonic transducers are located in or adjoining an internal wall in a pipe, then pressure head loss is minimized, but signal loss occurs due to fluid boundary wall effects and increased sensitivity to upstream conditions
Solution Approach 1:
The patent moves the transducers from the two-dimensional wall surface into the three-dimensional fluid flow stream, positioning them in the center of the flow where fluid velocity is highest and boundary wall effects are minimized. This dimensional transition from wall-mounted to flow-immersed positioning resolves the contradiction by eliminating boundary layer interference while maintaining minimal pressure loss through the flow path.
Solution Approach 2:
The patent introduces a flow stabilizer element as an intermediary component that conditions the flow field around the transducers. This stabilizer creates a controlled flow environment that reduces turbulence and boundary layer effects at the transducer location, thereby improving signal reliability without significantly increasing pressure head loss.
2Reliability
If ultrasonic transducers are provided in a bypass stream, then signal transmission is improved, but pressure head loss across the fluid flow meter increases
Solution Approach 1:
The patent merges the transducer mounting function with the main fluid flow path by positioning transducers directly within the flow stream rather than separating them in a bypass. This integration allows the flow path to serve dual purposes: carrying fluid and providing a stable mounting environment for transducers, thereby eliminating the need for separate bypass streams and reducing overall pressure head loss.
Solution Approach 2:
The patent applies local quality modification by creating a stabilized flow region specifically at the transducer location within the main flow stream. The flow stabilizer element locally conditions the flow characteristics at the measurement point without requiring a complete bypass stream, thus improving signal quality only where needed while minimizing overall pressure loss.
3Reliability
If a plastic housing is used to provide electrical decoupling and mounting stability, then electrical isolation is improved, but the housing cannot withstand high temperature and high pressure conditions
Solution Approach 1:
The patent employs a composite housing structure combining plastic material for electrical decoupling with metal reinforcement elements for mechanical strength. The plastic component provides electrical isolation and corrosion resistance, while the metal reinforcement sections withstand high temperature and pressure conditions. This composite approach allows the housing to simultaneously achieve electrical decoupling reliability and environmental adaptability.
Solution Approach 2:
The patent applies local quality differentiation by using plastic material specifically for electrical isolation components and metal material specifically for high-stress structural components. This localized material selection allows each region of the housing to be optimized for its specific function, with plastic providing electrical decoupling where needed and metal providing mechanical strength where required by high temperature and pressure 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 configuration reduces measurement inaccuracies and pressure head loss, allowing for accurate fluid flow measurement in high-temperature and high-pressure environments with improved signal transmission and fluid stabilization.
Implementation Method 1
Ultrasonic transducers comprising piezo-ceramics or piezo-crystals, which produce ultrasonic signals when a voltage is applied thereto
Implementation Method 2
ultrasonic transducers comprising piezo-ceramics or piezo-crystals, which produce ultrasonic signals when a voltage is applied thereto
Implementation Method 3
a flow stabilizer for stabilizing fluid flow in the fluid conduit
Data Source
Figure 1~2
Figure 3~4a
Figure 4b~5
AI summary
An ultrasonic fluid flow meter (1) comprising a fluid conduit with an inlet (5) and an outlet (6). The fluid conduit is bound by an inner periphery. The meter includes a first and a second ultrasonic transducer (17a, 17b) for measuring a fluid flow in the fluid conduit. The first and second ultrasonic transducers (17a, 17b) are arranged in facing alignment. The first and second ultrasonic transducers (17a, 17b) are arranged within the fluid conduit spaced from said inner periphery. Each of the first and second ultrasonic transducers (17a, 17b) are supported by an associated support mounting (16a, 16b). A plurality of fluid apertures (23) are provided around each ultrasonic transducer.