Clog Resistant Low Pass Filter for Pressure Transducer
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Solution Overview
Problem
Pressure transducers often malfunction due to clogging from particulates in measurement media, which can lead to resonance excitation and damage from dynamic pressures, especially in fuel and hydraulic systems where dynamic pressures can exceed steady-state pressures and resonate with the transducer's internal cavities.
Innovation Solution
A pressure transducer assembly with a mechanical filter element featuring multiple machined passageways, allowing for selective tuning by inserting apertures of varying dimensions, which reduces clogging and maintains frequency response by configuring the filter and transducer cavities to manage pressure dynamics effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single narrow path or in-line porous filter is used to act as a Helmholtz resonator, then high-frequency pressure components are attenuated, but the filter becomes clogged over time when particulates accumulate
Solution Approach 1:
The filter assembly is divided into multiple separate filter elements, each with its own filtering path. This segmentation means that if one path becomes clogged, the others can still function, thereby maintaining reliability while continuing to attenuate high-frequency pressure components.
Solution Approach 2:
The patent transitions from a single-line (one-dimensional) filter path to a multi-path three-dimensional filter structure. This dimensional expansion provides redundant flow paths that bypass clogged areas, preventing complete filtration failure while maintaining the resonator's ability to attenuate high-frequency pressures.
2Object-affected harmful factors
If a single narrow path is used in communication with a cavity to act as a Helmholtz resonator, then resonance characteristics are controlled, but the transducer can malfunction when the path becomes clogged
Solution Approach 1:
The resonator system is segmented into multiple independent filter elements with separate paths. This segmentation ensures that if one path becomes clogged and loses its resonant function, the other paths continue to provide resonance control, preventing transducer malfunction.
Solution Approach 2:
The patent employs filter elements with different aperture sizes and lengths, creating a spectrum of resonance characteristics. This parameter diversity ensures that at least some filter elements will remain effective in controlling resonance even when others become clogged, maintaining transducer reliability.
3Reliability
If multiple passageways are provided in the filter element, then clogging resistance is improved, but the device complexity increases
Solution Approach 1:
Multiple filter elements are combined within a single filter assembly that integrates with the transducer housing. This merging approach provides multiple passageways for improved clogging resistance while containing the overall structure within a unified, manageable component that does not significantly increase device complexity.
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 enables reliable operation of pressure transducers even when some passageways become blocked, effectively reducing clogging and resonance-induced damage by selectively tuning the filter and transducer assembly to manage pressure dynamics, ensuring accurate measurement of both static and dynamic pressures.
Implementation Method 1
a mechanical filter element having multiple machined passageways for which the measurement media may traverse
Implementation Method 2
the filter can be used to reduce pressure resonances that can damage or reduce the lifespan of the pressure transducer
Data Source
AI summary
A reconfigurable pressure transducer assembly having an input tube filter assembly is provided. Multiple small inlet apertures of the transducer housing or input tube filter assembly may be utilized to filter particulate matter from the measurement media/fluid. The resonant frequency and dampening characteristics of the pressure transducer assembly may be configured by the input tube filter assembly such that temporary clogging of a portion of the small inlet apertures does not appreciably affect the resonant frequency and dampening characteristics. The input tube filter assembly includes one or more inserts disposed in an input tube channel, the one or more inserts including one or more apertures of selectable dimensions and extending therethrough from a first end to a second end. The one or more inserts define at least a filter aperture, and the input tube filter assembly is tunable by selection of the selectable dimensions of the one or more inserts.