Ultrasonic Flow Insert Reflector Positioning for Accurate Signal Paths
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Solution Overview
Problem
Ultrasonic flow meters experience variations in signal path length due to inconsistent positioning of reflectors, leading to inaccuracies in flow rate measurements.
Innovation Solution
The reflectors are positioned and fixed within the injection molded insert body during the formation process using an injection molding tool, ensuring precise angular orientation and integration within the flow insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reflectors are installed using traditional methods with holding brackets, then installation is simpler, but positioning accuracy deteriorates due to mechanical tolerance stackup and shifts
Solution Approach 1:
The reflector positioning function is merged with the flow insert body itself. Machined surfaces are directly formed on the flow insert body to provide precise positioning surfaces for the reflectors, eliminating the need for separate holding brackets and reducing mechanical tolerance stackup. This integration ensures that reflector positions are accurately defined by the injection molded features rather than by additional positioning components.
Solution Approach 2:
The positioning surfaces are pre-formed on the flow insert body during the injection molding process, before the reflectors are installed. This preliminary creation of precise positioning features ensures that when reflectors are installed, they are automatically positioned with high accuracy by the pre-existing machined surfaces, eliminating the need for complex post-assembly positioning adjustments.
2Measurement precision
If additional reflectors are added to extend signal path length, then measurement precision improves, but variability increases due to stacking effect of positioning errors
Solution Approach 1:
Multiple reflectors are integrated into a single flow insert body with all positioning surfaces machined directly on the body. This merging of multiple reflector mounting functions into one integrated component ensures that all reflectors are positioned relative to a common reference frame, eliminating the stacking effect of positioning errors that would occur with separate mounting operations for each reflector.
Solution Approach 2:
All reflectors are positioned using the same type of machined surface features on the flow insert body, creating a homogeneous positioning system. This uniform approach to positioning all reflectors ensures consistent accuracy across the entire signal path, as each reflector is positioned by the same precision method rather than by a chain of different positioning interfaces.
3Ease of manufacture
If reflectors are fixed after injection molding, then manufacturing flexibility is maintained, but positioning variability increases due to installation errors
Solution Approach 1:
The positioning surfaces are created during the injection molding process itself, before the reflectors are installed. This preliminary formation of precise positioning features ensures that when reflectors are subsequently installed, they are positioned with high consistency by the pre-existing machined surfaces on the flow insert body, eliminating installation-induced positioning variability.
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 method reduces mechanical tolerance stackup variability, providing consistent and accurate ultrasonic signal path lengths, enhancing the flow meter's measurement precision.
Implementation Method 1
positioning one or more reflectors in a flow insert cavity configured to receive plastic by injection molding
Implementation Method 2
The flowmeter includes two or more transducers spaced apart for each other that send and receive ultrasonic signals forward (with the direction of the flowing fluid) and backward (against the direction of the flowing fluid)
Implementation Method 3
The flowmeter calculates flowrate by comparing the difference between the 'transit time' of the signal when it travels with the flow stream and when it travels against the flow stream
Data Source
AI summary
A computer-implement method for forming a flow insert for an ultrasonic flow meter. The method includes positioning one or more reflectors in a flow insert cavity configured to receive plastic by injection molding and configured to define an ultrasonic signal path based on machined surfaces of the mold and fixing the one or more reflectors in position along the ultrasonic signal path extending into the flow insert cavity. The method further includes forming a flow insert body by injection molding and configured to define an ultrasonic signal path within a flow conduit that includes one or more reflectors integrated within the flow insert body during the injection molding and providing ultrasonic signal reflection along the ultrasonic signal path.