Gas Metering Chamber Fairing for Clean Ultrasonic Flow Sensing
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Solution Overview
Problem
Existing gas flow meter designs face challenges in achieving accurate measurements due to short effective distance between ultrasonic transducers, large cross-sectional areas, and contamination from pollutants, which compromise measurement accuracy.
Innovation Solution
A gas flow metering gas chamber with a cavity featuring angled ultrasonic transducer mounting holes and a reflection device forming an L-shaped signal passage, combined with a fairing that diffuses gas flow to increase effective distance and reduce cross-sectional area, while preventing pollutant contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the effective distance between ultrasonic transducers is increased, then measurement accuracy is improved, but the device size and cross-sectional area increase
Solution Approach 1:
The patent transitions from a straight linear arrangement to a folded L-shaped or Z-shaped transducer layout, utilizing spatial dimensionality changes to extend the effective measurement path length while maintaining a compact cross-sectional footprint. This allows the ultrasonic transducers to be positioned at greater effective distances without proportionally increasing the device's cross-sectional area.
2Area of stationary object
If the cross-sectional area of the gas chamber is reduced, then device compactness is improved, but gas flow velocity decreases
Solution Approach 1:
By folding the measurement path in L-shaped or Z-shaped configurations, the patent extends the effective measurement distance along the flow path without requiring a proportional increase in cross-sectional area. This dimensional approach allows maintaining higher gas flow velocities while achieving longer measurement paths for improved accuracy.
3Device complexity
If ultrasonic transducers are mounted directly in the flow path, then device complexity is reduced, but pollutant contamination increases
Solution Approach 1:
The patent introduces a reflective surface or waveguide structure as an intermediary element that allows ultrasonic transducers to be positioned in protected locations away from the direct pollutant-laden flow path. The intermediary component transmits or reflects ultrasonic waves through the gas flow without requiring the transducers themselves to be exposed to contaminants, thus reducing pollution while maintaining functional simplicity.
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 design enhances the effective distance between ultrasonic transducers, increases gas flow velocity, and improves measurement accuracy by minimizing pollutant contamination on the transducers.
Implementation Method 1
Two sets of ultrasonic transducers are provided diagonally on both sides of a gas flow metering gas chamber. Firstly, the ultrasonic transducer at the gas inlet of the gas flow metering gas chamber sends ultrasonic waves downward to the ultrasonic transducer at the gas outlet
Implementation Method 2
a reflection device being provided at the gas outlet, an angle being formed between a reflection surface of the reflection device and the direction of the gas flow, and the reflection surface of the reflection device facing the signal emitting direction of the second ultrasonic transducer
Implementation Method 3
gas diffusely flowing in the gas intake holes of the fairing from front and rear ends of the fairing, and then flowing into the gas flow channel and the gas guide hole in turn
Data Source
AI summary
The invention provides a gas flow metering gas chamber and a gas flow meter. The gas flow meter includes the gas flow metering gas chamber, a display device and a housing. The gas flow meter gas cell includes a cavity, a gas inlet, a gas outlet, two ultrasonic transducer mounting holes and a reflection device. The signal emitted by the first ultrasonic transducer installed in the first ultrasonic transducer mounting hole and the signal emitted by the second ultrasonic transducer installed in the second ultrasonic transducer mounting hole intersects with each other to form an L-shaped reflection passage. Compared with V-shaped, W-shaped, and N-shaped reflection structures, the effective distance between the two ultrasonic transducers of the present invention more is increased, the cross section of the cavity is reduced, and the rate of the gas flow is increased, which avoids contamination contained in the measured gas to contaminate the ultrasonic transducers and thereby improves the measurement accuracy.