Ultrasonic Flow Meter Transformer Capsule Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ultrasonic flow meters face challenges in maintaining measurement accuracy and durability due to issues like electrical charge hazards, corrosive fluid exposure, and the need for frequent maintenance, which disrupts fluid flow and reduces component longevity.
Innovation Solution
The design includes a spool piece with transducer ports and assemblies where the piezoelectric capsule is exposed to the fluid, while the transformer capsule is isolated, using an annular seal assembly to restrict fluid flow and prevent corrosive exposure, and a 90° push-pull plug coupling for improved cable protection and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transformer is positioned within the transducer assembly and exposed to the same conditions as the piezoelectric element, then the device complexity is reduced, but the reliability deteriorates due to susceptibility to corrosive fluid damage
Solution Approach 1:
The transducer assembly is divided into two separate capsules: a piezoelectric capsule exposed to the fluid for ultrasonic transmission, and a transformer capsule isolated from the fluid for electrical signal processing. This segmentation allows each component to be optimized for its specific operational requirements while protecting sensitive electrical components from corrosive environments.
Solution Approach 2:
A sealed cable conduit acts as an intermediary barrier between the fluid environment and the transformer capsule. The conduit provides a protected pathway for electrical connections, allowing the transformer to remain isolated from corrosive fluids while maintaining electrical connectivity to the piezoelectric element.
2Reliability
If the entire transducer assembly is removed for component replacement, then the reliability can be maintained through component replacement, but the productivity deteriorates due to fluid flow interruption
Solution Approach 1:
The transducer assembly is segmented into independently replaceable modules - the piezoelectric capsule and transformer capsule can be replaced separately without removing the entire assembly from the spool piece. This modular design minimizes maintenance downtime and maintains fluid flow continuity during component replacement operations.
Solution Approach 2:
The cable connections are designed with preliminary sealing and protection features, including sealed cable conduits and protective boots, that allow for quick disconnection and reconnection during maintenance. This preliminary preparation enables rapid component replacement without requiring full assembly removal or prolonged system shutdown.
3Reliability
If the transformer is isolated from the fluid using a sealed capsule, then the reliability is improved by protecting against corrosive exposure, but the device complexity increases due to additional sealing requirements
Solution Approach 1:
A flexible cable conduit with integrated sealing features provides the barrier between the fluid environment and the transformer capsule. The conduit's flexible nature allows it to accommodate thermal expansion and vibration while maintaining its sealing function, reducing the complexity of rigid sealing mechanisms.
Solution Approach 2:
The transformer capsule is extracted from the direct fluid environment and placed in a separate, sealed compartment. This extraction eliminates the need for complex in-situ sealing around electrical connections, as the entire transformer assembly can be sealed as a single unit and connected via protected cable pathways.
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 enhances measurement accuracy, reduces maintenance interruptions, and increases the longevity of the flow meter components by isolating sensitive parts from corrosive fluids and allowing for easier maintenance without disrupting fluid flow.
Implementation Method 1
Each transducer assembly includes a piezoelectric element, and when an alternating current is applied to the piezoelectric element of the first transducer assembly, the piezoelectric element responds by radiating an ultrasonic wave in the fluid being transported through the flow meter
Implementation Method 2
When the wave is incident upon the piezoelectric element of the second transducer assembly, that transducer assembly responds by generating an electric signal
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An ultrasonic flow meter for measuring the flow of a fluid through a pipeline, comprisinga spool piece including a throughbore and a plurality of transducer ports extending from the outer surface of the spool piece to the throughbore; a transducer assembly disposed in one of the transducer ports, wherein the transducer assembly has a central axis and comprises a piezoelectric capsule having a first end proximal the throughbore of the spool piece and a second end distal the throughbore of the spool piece, wherein the piezoelectric capsule comprises a piezoelectric housing and a piezoelectric element disposed in the piezoelectric housing, wherein the piezoelectric housing extends from the first end of the piezoelectric capsule to the second end of the piezoelectric capsule and includes a first counterbore extending axially from the first end of the piezoelectric capsule, wherein the piezoelectric element is disposed in the first counterbore of the piezoelectric housing; and a transformer capsule coupled to the piezoelectric capsule, wherein the transformer capsule comprises a transformer housing and a transformer disposed within the transformer housing; an annular seal assembly radially disposed between the transducer assembly and the spool piece and axially disposed between the transformer capsule and the throughbore of the spool piece, wherein the seal assembly is configured to restrict the flow of fluid through the transducer port between the throughbore of the spool piece and the transformer capsule.