Plastic Ultrasonic Measurement Section Z-Path
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Solution Overview
Problem
Conventional ultrasonic flow measurement devices face issues with bubble or particle traps, signal interference, and the inability to produce a plastic measurement section without internal welding seams, which affect measurement accuracy and precision.
Innovation Solution
A plastic ultrasonic measurement section with two ultrasonic transducers arranged in a spaced manner, guiding sound in a Z-shaped path using reflectors, allowing for one-piece injection molding without internal seams, and utilizing the characteristics of plastics and external reflectors for necessary reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If colinear arrangement of ultrasonic transducers is used, then measurement precision is improved, but device complexity increases due to U-shaped flow guidance and multiple parts requiring welding
Solution Approach 1:
The measurement section is divided into multiple functional zones with different wall thicknesses (thick-walled sections for acoustic path, thin-walled sections for compactness). This segmentation allows the Z-shaped acoustic path to be achieved within a compact overall dimension while maintaining measurement precision through proper acoustic path design.
Solution Approach 2:
The acoustic path is configured in a Z-shaped three-dimensional route rather than a simple linear or U-shaped path. The sound waves traverse through thick-walled sections at angles, utilizing spatial dimensionality to achieve the required acoustic path length and reflection geometry within a compact measurement section volume.
2Measurement precision
If U-shaped flow guidance is used with colinear transducers, then measurement precision is maintained, but manufacturing precision deteriorates due to welding seams creating particle traps
Solution Approach 1:
The measurement section is designed as a single integrated component with through-flow connections, eliminating the need for welding assembly. The thick-walled and thin-walled sections are combined in one piece, ensuring seamless construction that prevents particle and bubble accumulation while maintaining the required acoustic path geometry for precise measurements.
3Measurement precision
If curved reflecting surfaces are used to focus sound waves, then measurement precision is improved, but reliability deteriorates due to strong damping and weak signals susceptible to interference
Solution Approach 1:
The measurement section features localized thick-walled sections positioned at specific locations to provide acoustic reflection and path guidance, while other sections maintain thin-walled construction for compactness. This local variation in wall thickness creates appropriate acoustic boundaries without requiring curved focusing surfaces, thereby maintaining signal strength while achieving precise acoustic path control.
4Device complexity
If angular inlet points are used in conventional constructions, then device complexity is reduced, but reliability worsens due to bubble and particle trap formation causing measurement falsification
Solution Approach 1:
The measurement section incorporates rounded transitions and curved geometries at inlet points and between different wall thickness sections. This curvature eliminates sharp angles that would trap bubbles and particles, ensuring smooth flow paths that maintain measurement reliability while keeping the overall construction relatively simple through integrated design.
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 prevents bubble and particle traps, reduces signal interference, and enables accurate flow measurement while allowing for a seamless, durable, and easily producible measurement section that avoids clogging and measurement falsifications.
Implementation Method 1
The transit time difference method makes use of the fact that the propagation rate of an ultrasonic signal is dependent on the flow rate of the medium in which it propagates
Implementation Method 2
the propagation rate of an ultrasonic signal is dependent on the flow rate of the medium in which it propagates
Implementation Method 3
the sound between the transmitting and receiving transducers can be guided in Z-shaped manner by at least two reflectors
Data Source
AI summary
The present invention relates to a plastic ultrasonic measurement section (1) used for the flow measurement of fluids. It is equipped with two ultrasonic transmitting and receiving transducers (2, 3) spaced in the fluid flow direction and is characterized in that the sound is guidable in Z-shaped manner between the transmitting and receiving transducers (2, 3) by means of at least two reflectors (4). A description is given of a corresponding measurement method and a method for the one-piece production of a measurement section (1) by injection moulding.