Gas Meter Dust Filter for Ultrasonic Measurement Accuracy
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Solution Overview
Problem
Ultrasonic gas meters face measurement inaccuracies due to dust particles settling on transducers and duct walls, leading to errors of up to 4-5%, with existing solutions like enlarged chambers failing to prevent dust ingress at high flow rates.
Innovation Solution
A dust filter with a specially shaped filter medium and frames is integrated into the gas meter, positioning it away from the measuring module, with a hole aligning with the inlet and outlet channels to trap dust before it reaches the module, optionally using magnets for metal particles and pressure sensors for monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dust filter is installed close to measuring module, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The dust filter is merged with the inlet channel structure, where the filter medium is integrated into the channel wall itself. This combination eliminates the need for separate filter housings and mounting mechanisms, reducing device complexity while maintaining close proximity to the measuring module for effective dust removal.
Solution Approach 2:
The inlet channel serves dual functions: as a gas passage and as a structural support for the dust filter. The filter medium is embedded in the channel wall, allowing the channel to simultaneously guide gas flow and trap dust particles, thereby reducing overall device complexity while improving measurement accuracy.
2Device complexity
If dust filter is installed away from measuring module, then device complexity is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The dust filter is positioned in the inlet channel upstream of the measuring module, performing preliminary dust removal before gas enters the measurement zone. This preliminary action ensures that dust particles are trapped early in the flow path, maintaining measurement accuracy without requiring the filter to be immediately adjacent to the transducers.
Solution Approach 2:
The filter medium is selectively positioned in the inlet channel where dust particles are most concentrated in the gas flow. By placing filtering capability at this specific location rather than uniformly throughout the meter, the system achieves effective dust removal with minimal filter material and reduced overall device complexity.
3Measurement precision
If filter medium area is increased, then dust removal efficiency is improved, but pressure drop increases
Solution Approach 1:
A porous filter medium is used in the inlet channel wall, allowing gas to pass through while trapping dust particles. The porous structure provides large surface area for dust capture without creating significant flow resistance, thus achieving effective dust removal with minimal pressure drop across the filter.
Solution Approach 2:
The filter design takes advantage of gas flow dynamics in the inlet channel, where the velocity and pressure distribution naturally guide dust particles toward the filter medium. This pneumatic assistance enhances dust capture efficiency without requiring excessive filter area or creating high pressure drops.
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 significantly reduces measurement errors to less than 1%, maintains stable metrological performance, and prevents clogging, while ensuring compliance with pressure drop standards.
Implementation Method 1
a dust filter, arranged to be installed in a single-tube gas meter... comprising a filter medium in which a hole is made... the gas, before entering the measuring module, passes into the inlet channel through the filter media
Implementation Method 2
a magnet positioned on the first frame and arranged to attract metal dust particles
Implementation Method 3
The dust then falls by gravity into a dust deposition zone, located in the enlarged chamber outside the measuring conduit
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Dust filter (40) for gas meter (1) comprising an inlet channel (41) and an outlet channel (42) passing through the same first plane (P1), the dust filter comprising a filter medium (43) in which a hole is made, a section of the filter medium and a section of the hole, according to a second plane (P2) perpendicular to a thickness of the filter medium, having the shapes of a section of the inlet channel and the outlet channel according to the first plane, the dust filter (40) being arranged so that, when installed in the meter (1), the gas, before entering the measuring module, passes through the inlet channel through the filter medium, and after exiting the measuring module, passes through the outlet channel through the hole.