Ultrasonic Gas Metering Chamber With L-Shaped Reflection Path
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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, angled ultrasonic transducer mounting holes, and a reflection device forming an L-shaped signal passage, combined with a fairing at the inlet to diffuse gas flow and shield the transducers, increasing the effective distance and reducing 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 gas chamber cross-sectional area increases
Solution Approach 1:
The patent transforms the ultrasonic signal path from a straight line to an L-shaped path by utilizing the reflection device. The first ultrasonic transducer emits signals that reflect off the reflection device to reach the second ultrasonic transducer, effectively using spatial dimensionality to increase the propagation distance without proportionally increasing the chamber cross-sectional area.
2Measurement precision
If the gas flow velocity is increased, then measurement accuracy is improved, but pollutant contamination of transducers increases
Solution Approach 1:
The patent extracts the ultrasonic transducers from the direct gas flow path by positioning them on side walls and using angled signal transmission. The reflection device further directs signals away from the main gas flow, effectively separating the measurement function from the pollutant-laden gas flow while maintaining measurement accuracy.
3Area 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:
The patent uses the L-shaped signal path with reflection device to effectively increase the measurement distance in the longitudinal direction without increasing the cross-sectional area. This allows maintaining high gas flow velocity in a compact chamber while achieving sufficient effective propagation distance for accurate measurements.
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, reduces the gas chamber's cross-sectional area, and improves measurement accuracy by minimizing pollutant contamination, resulting in more precise gas flow measurements.
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
Because the flow of gas affects the two propagation times, the two propagation times are different, and a flow velocity of the gas can be obtained by a predetermined formula
Implementation Method 3
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 4
the gas diffusely flowing in the fairing from two ends of the fairing, and then flowing in the plurality of air intake holes, the diffusion hole, and the cavity in turn
Data Source
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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.