Acoustic Waveguide Disk Coupler High-Pressure Sealing
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Solution Overview
Problem
Existing acoustic waveguide assemblies face challenges in mounting and sealing thin elongated rods to conduits, especially under high pressure conditions, which affects the accuracy of fluid measurements due to deformation and failure of seals over time.
Innovation Solution
The use of a disk coupler or tube coupler that minimizes contact with the waveguide rod to prevent dampening of acoustic waves and provides an effective seal, allowing for accurate density measurements even in high-pressure environments by using a waveguide rod with a disk or tube coupler that is not fixedly attached to the waveguide, ensuring minimal interference with the acoustic wave.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thin elongated rod waveguide is used for accurate density measurements, then measurement precision is improved, but mounting and sealing difficulty increases under high pressure conditions
Solution Approach 1:
The waveguide assembly is segmented into distinct functional components: the thin waveguide rod for acoustic wave propagation, a separate sealing mechanism (O-ring or PTFE seal) for high-pressure containment, and a mounting structure (flange or adapter) for conduit integration. This segmentation allows each component to be optimized independently - the rod remains thin for measurement precision while the sealing and mounting components handle the mechanical and pressure requirements.
Solution Approach 2:
An intermediary sealing component (O-ring or PTFE seal) is introduced between the thin waveguide rod and the high-pressure conduit environment. This intermediary protects the fragile thin rod from direct exposure to high pressure while maintaining acoustic wave transmission, resolving the contradiction between using a thin rod for precision and needing to seal against high pressure.
2Reliability
If sealing components are used around the thin waveguide rod, then high pressure sealing is achieved, but acoustic wave dampening increases
Solution Approach 1:
The sealing components are designed with local quality - the O-ring or PTFE seal contacts only specific portions of the waveguide rod assembly, specifically avoiding contact with the central acoustic wave propagation path. The seal is positioned at the interface between the waveguide assembly and conduit, creating a localized sealing zone that does not interfere with the acoustic field in the waveguide rod itself.
3Ease of manufacture
If PTFE seals are used in laboratory settings, then sealing is achieved, but long term reliability deteriorates under high pressure due to deformation
Solution Approach 1:
The sealing system uses composite material construction - combining PTFE (polytetrafluoroethylene) with reinforcing structures such as metal backings or support rings. This composite approach maintains the low-friction, chemically inert properties of PTFE for sealing while adding structural rigidity to prevent deformation under prolonged high pressure, thereby improving long-term reliability.
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 solution enables accurate and reliable fluid density measurements by maintaining the integrity of the acoustic wave and providing a durable seal, enhancing the usability of thin elongated waveguides in commercial and industrial applications.
Implementation Method 1
a transducer assembly launches an acoustic wave into a waveguide that is mounted and sealed to the conduit and inserted into the fluid
Implementation Method 2
The time of flight of the acoustic wave in the section of the waveguide inserted into the fluid is a function of the characteristics of the fluid and therefore can be used to determine those characteristics
Data Source
AI summary
Acoustic waveguides are disclosed for mounting to a conduit. The acoustic waveguides provide a mounting area that minimizes the effect of the mount on the acoustic wave traveling through the waveguide while providing an effective seal, even under high pressure conditions.