Flow Sensor Filter Inserts for Pressure Output
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Solution Overview
Problem
Flow sensors face challenges in accurately measuring fluid flow rates and pressure drops due to noise caused by turbulent fluid flow and structural inconsistencies, which affect the linear relationship between flow rate and pressure differential.
Innovation Solution
Incorporating filter inserts with specific acoustic impedance into the fluid channel to produce a controlled pressure drop and laminarize the fluid flow, ensuring a consistent and predictable relationship between flow rate and pressure measurements across a range of flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filter inserts are added to control pressure drop and laminarize flow, then measurement precision and reliability improve, but device complexity increases
Solution Approach 1:
The patent employs porous filter inserts with specific acoustic impedance characteristics to control fluid flow and reduce turbulence. These porous materials create a predictable pressure drop and laminarize the flow profile, enabling more accurate flow rate and pressure measurements while maintaining a relatively simple overall device structure.
Solution Approach 2:
The filter inserts act as intermediary elements between the fluid source and the sensing elements. By positioning these filters upstream of the flow sensor and pressure sensor, the patent mediates the turbulent flow into a more controlled, laminar flow, thereby improving measurement precision without requiring complex active control systems.
2Reliability
If filter inserts with specific acoustic impedance are used to laminarize flow, then reliability of measurements improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies particular acoustic impedance parameters for the filter inserts to achieve desired flow characteristics. By carefully selecting and controlling the acoustic impedance parameter of the filter material, the patent ensures a consistent and predictable relationship between flow rate and pressure differential, thereby improving measurement reliability.
Solution Approach 2:
The filter inserts are pre-configured with specific acoustic impedance characteristics before assembly into the sensor. This preliminary preparation of the filter properties ensures that when assembled, the device immediately provides the intended flow conditioning and measurement reliability without requiring additional calibration or adjustment during operation.
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 use of filter inserts with specific acoustic impedance stabilizes fluid flow, reducing noise and turbulence, resulting in a more reliable and consistent output of flow rate and pressure measurements, enhancing the accuracy and reliability of flow sensor assemblies.
Implementation Method 1
In some instances, a fluid flow characteristic (e.g., acoustic impedance) of the filter insert may be chosen so that the measure related to the flow rate and the measure related to the pressure and/or pressure drop are linearly or substantially linearly related.
Implementation Method 2
The one or more filter inserts may be configured to provide a predetermined pressure drop at a given flow rate of fluid, over at least a predefined range of flow rates.
Implementation Method 3
Incorporating filter inserts with specific acoustic impedance into the fluid channel to produce a controlled pressure drop and laminarize the fluid flow
Data Source
AI summary
This disclosure relates generally to flow sensors, and more particularly, to flow sensors that include a pressure related output signal. In one example, a flow sensor assembly may include a housing with an inlet flow port, an outlet flow port and a fluid channel extending therebetween, with a flow sensing element positioned in the housing and exposed to the fluid channel. A filter insert may be situated in the fluid channel, sometimes upstream of the flow sensor. When so configured, the flow sensor assembly may output a pressure or differential pressure based, at least in part, on a value of the flow rate through the fluid channel as sensed by the flow sensor.