Ultrasonic metering module and ultrasonic gas meter

Abstract

The invention discloses an ultrasonic metering module and an ultrasonic gas meter, and belongs to the technical field of gas metering, the ultrasonic metering module comprises a shell and a transducer, a metering flow channel extending in the first direction is arranged in the shell, and the shell comprises a first inner wall and a second inner wall which are oppositely arranged in the second direction. The energy converter comprises a first energy converter and a second energy converter, the first energy converter is arranged on one side of the first inner wall in the shell, and the second energy converter is arranged on one side of the second inner wall in the shell. The incidence angle of the transducer is A, the unit is degree, the width of the metering flow channel in the second direction is H, the unit is mm, and A =-1.23 * H2 + 44.7 * H-a; wherein a is greater than or equal to 370 and less than or equal to 374.5 According to the ultrasonic metering module provided by the invention, the effective sonic path distance of ultrasonic waves and the attenuation condition of the ultrasonic waves can be balanced while the overall size is reduced, the measurement sensitivity and stability of the ultrasonic metering module are ensured, and the measurement precision is improved.

Description

Technical Field

[0001] This application relates to the field of gas metering technology, and in particular to an ultrasonic metering module and an ultrasonic gas meter. Background Technology

[0002] In ultrasonic gas meters, the ultrasonic flow transducer for testing natural gas is a transceiver integrated transducer. It's necessary to consider not only the transmitting sensitivity of the transmitting transducer but also the receiving sensitivity of the receiving transducer. Typically, a pair of identical ultrasonic flow transducers are used to form the ultrasonic transmitting and receiving system. However, during the transmission and reception of ultrasonic waves, gas ultrasonic transducers face a significant difference in acoustic impedance between the piezoelectric ceramic and the gas medium. Acoustic impedance is the product of the medium's density and the velocity of sound; the acoustic impedance of piezoelectric ceramics is much higher than that of the gas medium. This difference in acoustic impedance causes most ultrasonic waves to be reflected at the transducer-gas interface, failing to effectively transmit into the gas, resulting in significant energy loss. This means that the signal strength of gas ultrasonic transducers typically only reaches the millivolt level.

[0003] While ultrasonic wave attenuation poses a challenge to accurate measurements, increasing the spacing between ultrasonic transducers can effectively extend the time difference of sound wave propagation. A longer propagation time makes the ultrasonic waves more sensitive to changes in gas flow, improving the measurement accuracy of the gas meter. However, this leads to further exacerbation of signal attenuation. The metering components in ultrasonic gas meters face the challenge of optimizing the distance between ultrasonic transducers to achieve a sufficient propagation time difference while ensuring signal strength, thereby improving metering accuracy. Summary of the Invention

[0004] This application provides an ultrasonic metering module and an ultrasonic gas meter, which can extend the propagation time of ultrasonic waves while ensuring ultrasonic intensity, thereby improving the measurement accuracy of the ultrasonic metering module and ensuring stability and reliability, thus at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, an ultrasonic metering module is provided, comprising:

[0006] The housing has a metering channel extending in a first direction, and the housing includes a first inner wall and a second inner wall disposed opposite to each other in a second direction; the first direction and the second direction are perpendicular to each other.

[0007] The transducer includes a first transducer and a second transducer. The first transducer is disposed on one side of the first inner wall in the housing, and the second transducer is disposed on one side of the second inner wall in the housing. The ultrasonic waves emitted by the first transducer are adapted to be received by the second transducer after being reflected by the second inner wall and the first inner wall in sequence. The ultrasonic waves emitted by the second transducer are adapted to be received by the first transducer after being reflected by the first inner wall and the second inner wall in sequence.

[0008] The transducer has an incident angle of A° and a metering channel width of H mm along the second direction, satisfying the following:

[0009] A = -1.23 * H 2 +44.7*Ha;

[0010] Where 370≤a≤374.5.

[0011] On the one hand, by ensuring that the ultrasonic waves emitted by the first transducer are reflected twice by the second inner wall and the first inner wall before being received by the second transducer, and that the ultrasonic waves emitted by the second transducer are reflected twice by the first inner wall and the second inner wall before being received by the first transducer, an "N"-shaped path can be formed for the ultrasonic waves. This reduces the size of the ultrasonic metering module and improves space utilization while satisfying the effective sound path of the ultrasonic waves. On the other hand, by ensuring that the incident angle A of the transducer and the width H of the metering channel along the second direction satisfy the above formula, the sound path of the ultrasonic waves emitted by the first and second transducers can be kept within a reasonable range. This reduces ultrasonic wave attenuation, ensures the ultrasonic wave propagation distance, extends the ultrasonic wave propagation time, and improves measurement sensitivity. In other words, the ultrasonic metering module provided in this application can balance the effective sound path and ultrasonic wave attenuation while reducing the overall size, ensuring the measurement sensitivity and stability of the ultrasonic metering module and improving measurement accuracy.

[0012] Optionally, the sound path of the ultrasonic wave emitted by the first transducer is S1, where 70mm≤S1≤75mm;

[0013] And / or, the sound path of the ultrasonic wave emitted by the second transducer is S2, 70mm≤S2≤75mm.

[0014] By ensuring that the sound path S1 of the ultrasonic wave emitted by the first transducer and / or the sound path S2 of the ultrasonic wave emitted by the second transducer meet the above conditions, the attenuation rate of the ultrasonic wave can be controlled, the signal-to-noise ratio can be optimized, and sufficient sound path can be guaranteed to improve the sensitivity of the measurement, thereby ensuring the measurement accuracy.

[0015] Alternatively, 14 ≤ A ≤ 22.

[0016] By keeping the transducer's incident angle within the range of 14°-22°, the ultrasonic waves can be more concentrated in the second direction, reducing energy dispersion caused by beam diffusion during reflection, lowering signal attenuation, and improving transmission efficiency. Furthermore, within this incident angle range, the width of the metering channel in the second direction and its length in the first direction can be balanced while meeting the acoustic path requirements, resulting in a compact overall structure for the ultrasonic metering module.

[0017] Alternatively, 20 ≤ H ≤ 23.

[0018] That is, the width of the metering channel in the second direction is 20mm-23mm. By ensuring that the width of the metering component in the second direction is within the above range, the relationship between the width of the metering channel in the second direction and its length in the first direction can be balanced while meeting the ultrasonic path requirements, resulting in a compact overall structure of the ultrasonic metering module. Furthermore, keeping the width of the metering channel in the second direction within the above range allows the transducer's incident angle to remain within a small range while meeting the ultrasonic path requirements. This avoids excessive dispersion of ultrasonic waves on the first or second inner wall surface due to an excessively large incident angle, reducing the attenuation of ultrasonic waves during reflection.

[0019] Optionally, the center-to-center distance between the first transducer and the second transducer in the first direction is W, where 17mm ≤ W ≤ 25mm.

[0020] The metering channel extends along the first direction. By ensuring that the center-to-center distance W between the first and second transducers in the first direction meets the aforementioned conditions, the length of the metering channel in the first direction can be controlled within a reasonable range, improving the compactness of the ultrasonic metering module. Simultaneously, the center-to-center distance between the first and second transducers in the first direction also affects the angle of incidence. By satisfying the aforementioned range, the angle of incidence of the transducers can be kept within a certain range, reducing ultrasonic attenuation and improving measurement sensitivity.

[0021] Optionally, the length of the metering channel along the first direction is L, where 40mm ≤ L ≤ 80mm.

[0022] By ensuring that the length of the metering channel along the first direction is within the aforementioned range, the overall structural compactness of the ultrasonic metering module can be guaranteed. At the same time, the fluid can form a laminar flow, ensuring measurement stability and matching the installation requirements of the first and second transducers.

[0023] Optionally, the housing is provided with a first mounting groove and a second mounting groove on opposite sides in the second direction, the first transducer is adapted to be fixed in the first mounting groove, and the second transducer is adapted to be fixed in the second mounting groove.

[0024] The first mounting slot can fix the first transducer, and the second mounting slot can fix the second transducer, ensuring the installation accuracy of the first and second transducers, improving structural stability, and thus improving the reliability of the ultrasonic metering module.

[0025] Optionally, the ultrasonic metering module also includes a first latch and a second latch;

[0026] The first snap-fit ​​is adapted to engage with the first mounting slot to fix the first transducer in the first mounting slot;

[0027] The second latch is adapted to engage with the second mounting slot to secure the second transducer within the second mounting slot.

[0028] The engagement of the first clip with the first mounting slot effectively constrains the first transducer, preventing it from shifting, and the assembly process is simple. Similarly, the engagement of the second clip with the second mounting slot effectively constrains the second transducer, preventing the first transducer from shifting, and the assembly process is also simple.

[0029] Optionally, the housing includes an air intake section and a measuring pipe section disposed along the first direction;

[0030] A flow guide is installed at the end of the air intake section away from the measuring pipe section, and the metering flow channel is located inside the measuring pipe section.

[0031] By installing a flow guide on the air intake section, the gas entering the measuring tube section can be "pre-rectified" to eliminate intake turbulence, reduce smoothness distortion, make the gas flow velocity entering the measuring tube section uniform, and improve the accuracy of measurement.

[0032] Optionally, a fixing part is provided at the end of the measuring pipe section away from the air intake section.

[0033] The fixing part located at the end of the measuring tube section away from the air inlet section can be used to fix the ultrasonic flow component to other components.

[0034] According to a second aspect of this application, an ultrasonic gas meter is provided, including the ultrasonic metering module as described above.

[0035] The ultrasonic gas meter provided in this application has all the beneficial effects of the ultrasonic metering module described above, which will not be repeated here. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0038] Figure 1 This is a schematic diagram of the cross-sectional structure of the ultrasonic metering module provided in the embodiments of this application;

[0039] Figure 2 This is a schematic diagram of the cross-sectional structure of an ultrasonic metering module in related technologies;

[0040] Figure 3 This is a three-dimensional structural schematic diagram of the ultrasonic metering module provided in the embodiments of this application;

[0041] Figure 4 This is an exploded view of the ultrasonic metering module provided in the embodiments of this application. Figure 1 ;

[0042] Figure 5 This is a schematic diagram of the structure of the fairing provided in the embodiment of this application;

[0043] Figure 6 This is an exploded view of the ultrasonic metering module provided in the embodiments of this application. Figure 2 .

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Ultrasonic metering module; 10. Housing; 11. Measuring tube section; 111. Measuring flow channel; 112. First inner wall; 113. Second inner wall; 114. Fixing part; 115. First mounting slot; 116. Second mounting slot; 117. First buckle; 118. Second buckle; 119. Third mounting slot; 12. Air inlet section; 121. Flow guide; 1211. Reinforcing rib; 20. Transducer; 21. First transducer; 22. Second transducer; 30. Circuit board;

[0046] 200. Ultrasonic metering module; 23. Third transducer; 24. Fourth transducer. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0048] Firstly, such as Figure 1 As shown, this application provides an ultrasonic metering module 100, comprising:

[0049] The housing 10 has a metering channel 111 extending along the first direction X inside it, and the housing 10 includes a first inner wall 112 and a second inner wall 113 disposed opposite to each other in the second direction Y; the first direction X and the second direction Y are perpendicular to each other.

[0050] The transducer 20 includes a first transducer 21 and a second transducer 22. The first transducer 21 is disposed on one side of the first inner wall 112 in the housing 10, and the second transducer 22 is disposed on one side of the second inner wall 113 in the housing 10. The ultrasonic waves emitted by the first transducer 21 are adapted to be received by the second transducer 22 after being reflected by the second inner wall 113 and the first inner wall 112 in sequence. The ultrasonic waves emitted by the second transducer 22 are adapted to be received by the first transducer 21 after being reflected by the first inner wall 112 and the second inner wall 113 in sequence.

[0051] The incident angle of transducer 20 is A°, and the width of metering channel 111 along the second direction Y is Hmm, satisfying:

[0052] A = -1.23 * H 2 +44.7*Ha;

[0053] Where 370≤a≤374.5.

[0054] When ultrasound propagates in a fluid (such as fuel gas), its speed is affected by the fluid velocity. When the direction of ultrasound propagation is the same as the direction of fluid flow, the propagation speed is faster; conversely, when the direction of ultrasound propagation is opposite to the direction of fluid flow, the propagation speed is slower. By installing a pair of ultrasonic transducers 20 in the ultrasonic metering module 100, the propagation time of ultrasound under both co-current and counter-current conditions is measured, and the time difference is calculated. Based on the time difference and the parameters of the flow channel, the average flow velocity of the fluid in the flow channel can be derived. Combined with the cross-sectional area, the instantaneous flow rate can be calculated.

[0055] In related technologies, such as Figure 2 As shown, in the ultrasonic metering module 200, the two transducers are typically located on the same side. The ultrasonic wave emitted by one transducer is reflected once and received by the other transducer, forming a "V" shaped path. Figure 2 As shown, the third transducer 23 and the fourth transducer 24 are located on the same side, forming a "V" shaped path. To ensure the sensitivity of the ultrasonic metering module 200, the effective sound path of the ultrasonic wave needs to be guaranteed, which results in a larger overall size of the ultrasonic metering module 200, or a larger distance between the two transducers and a larger incident angle of the transducers. However, an increased incident angle of the transducers makes it easier for the sound beam to diffuse during ultrasonic wave reflection, causing ultrasonic energy dispersion, severe signal attenuation, and reduced measurement accuracy.

[0056] The ultrasonic metering module 100 provided in this application embodiment, on the one hand, allows the ultrasonic waves emitted by the first transducer 21 to be reflected twice by the second inner wall 113 and the first inner wall 112 before being received by the second transducer 22, and the ultrasonic waves emitted by the second transducer 22 to be reflected twice by the first inner wall 112 and the second inner wall 113 before being received by the first transducer 21. This enables the ultrasonic waves to form an "N"-shaped path, thereby reducing the size of the ultrasonic metering module 100 and improving space utilization while satisfying the effective sound path of the ultrasonic waves. On the other hand, by ensuring that the incident angle A of the transducer 20 and the width H of the metering channel 111 along the second direction Y satisfy the above formula, the sound path of the ultrasonic waves emitted by the first transducer 21 and the second transducer 22 can be kept within a reasonable range, reducing ultrasonic wave attenuation, ensuring ultrasonic wave propagation distance, extending ultrasonic wave propagation time, and improving measurement sensitivity. That is, the ultrasonic metering module 100 provided in this application can balance the effective sound path and ultrasonic attenuation of ultrasonic waves while reducing the overall size, thereby ensuring the measurement sensitivity and stability of the ultrasonic metering module 100 and improving the measurement accuracy.

[0057] It should be noted that the incident angle of transducer 20 refers to the distance between the extension direction of the ultrasonic wave emitted by transducer 20 and the normal direction (e.g., ...). Figure 1 As shown, the angle between the normal direction (i.e., the second direction Y) and the transducer 21. Since the first transducer 21 and the second transducer 22 are arranged in pairs, the incident angles of the first transducer 21 and the second transducer 22 are the same.

[0058] In some embodiments, the sound path of the ultrasonic wave emitted by the first transducer 21 is S1, where 70mm≤S1≤75mm.

[0059] By ensuring that the sound path S1 of the ultrasonic wave emitted by the first transducer 21 meets the above conditions, the attenuation rate of the ultrasonic wave can be controlled, the signal-to-noise ratio can be optimized, and sufficient sound path can be guaranteed to improve the sensitivity of the measurement and thus ensure the measurement accuracy.

[0060] For example, the sound path S1 of the ultrasonic wave emitted by the first transducer 21 can be 70mm, 70.75mm, 71mm, 71.81mm, 72mm, 73.75mm, 73.95mm, 74mm, 74.21mm, 74.61mm or 75mm.

[0061] In some embodiments, the sound path of the ultrasonic wave emitted by the second transducer 22 is S2, where 70mm≤S2≤75mm.

[0062] By ensuring that the sound path S2 of the ultrasonic wave emitted by the second transducer 22 meets the above conditions, the attenuation rate of the ultrasonic wave can be controlled, the signal-to-noise ratio can be optimized, and sufficient sound path can be guaranteed to improve the sensitivity of the measurement and thus ensure the measurement accuracy.

[0063] For example, the sound path S2 of the ultrasonic wave emitted by the second transducer 22 can be 70mm, 70.75mm, 71mm, 71.81mm, 72mm, 73.75mm, 73.95mm, 74mm, 74.21mm, 74.61mm or 75mm.

[0064] In some embodiments, 14 ≤ A ≤ 22.

[0065] By keeping the incident angle of the transducer 20 within the range of 14°-22°, the ultrasonic waves can be more concentrated in the second direction Y, reducing energy dispersion caused by beam diffusion during reflection, lowering signal attenuation, and improving transmission efficiency. Furthermore, within this incident angle range, the width of the metering channel 111 in the second direction Y and its length in the first direction X can be balanced while meeting the acoustic path requirements, resulting in a compact overall structure for the ultrasonic metering module 100.

[0066] For example, the incident angle of transducer 20 can be 14°, 15°, 16°, 17°, or 17.68°.

[0067] 18°, 19°, 20°, 21° or 22°.

[0068] In some embodiments, 20 ≤ H ≤ 23.

[0069] That is, the width of the metering channel 111 in the second direction Y is 20mm-23mm. By keeping the width of the metering component in the second direction Y within the above range, the relationship between the width of the metering channel 111 in the second direction Y and its length in the first direction X can be balanced while meeting the ultrasonic path requirements, making the overall structure of the ultrasonic metering module 100 compact. In addition, keeping the width of the metering channel 111 in the second direction Y within the above range can keep the incident angle of the transducer 20 within a small range while meeting the ultrasonic path requirements, avoiding excessive dispersion of ultrasonic waves on the surface of the first inner wall 112 or the second inner wall 113 due to an excessively large incident angle, and reducing the attenuation of ultrasonic waves during reflection.

[0070] For example, the width of the metering channel 111 in the second direction Y can be 20mm, 20.5mm, 21mm, 21.5mm, 22mm, 22.3mm, 22.5mm, 22.8mm or 23mm.

[0071] In some embodiments, such as Figure 1 As shown, the center-to-center distance between the first transducer 21 and the second transducer 22 in the first direction X is W, 17mm≤W≤25mm.

[0072] The metering channel 111 extends along the first direction X. By ensuring that the center distance W between the first transducer 21 and the second transducer 22 in the first direction X satisfies the aforementioned conditions, the length of the metering channel 111 in the first direction X can be controlled within a reasonable range, improving the compactness of the ultrasonic metering module 100. Simultaneously, the center distance W between the first transducer 21 and the second transducer 22 in the first direction X also affects the incident angle. By satisfying the aforementioned range, the incident angle of the transducer 20 can be kept within a certain range, reducing ultrasonic attenuation and improving measurement sensitivity.

[0073] It is understood that the center-to-center distance between the first transducer 21 and the second transducer 22 in the first direction X refers to the distance between the center point on the emitting surface of the first transducer 21 and the center point on the emitting surface of the second transducer 22. A larger center-to-center distance between the first transducer 21 and the second transducer 22 in the first direction X requires a larger length of the ultrasonic metering module 100 in the first direction X. A smaller center-to-center distance between the first transducer 21 and the second transducer 22 in the first direction X results in a smaller incident angle of the transducer 20 and a shorter ultrasonic path. This application balances the compactness of the ultrasonic metering module 100 and the ultrasonic path by setting the center-to-center distance W of the first transducer 21 and the second transducer 22 within the aforementioned range.

[0074] For example, the center distance W between the first transducer 21 and the second transducer 22 in the first direction X can be 17mm, 17.12mm, 18mm, 19mm, 19.79mm, 20mm, 21mm, 22mm, 22.06mm, 22.54mm, 23mm, 24mm or 25mm.

[0075] In some embodiments, such as Figure 1 As shown, the length of the metering channel 111 along the first direction X is L, 40mm≤L≤80mm.

[0076] By ensuring that the length of the metering channel 111 along the first direction X is within the aforementioned range, the overall structural compactness of the ultrasonic metering module 100 can be guaranteed. At the same time, the fluid can form a laminar flow within the metering channel 111, ensuring measurement stability and matching the installation requirements of the first transducer 21 and the second transducer 22.

[0077] In some embodiments, such as Figures 3-4 As shown, the housing 10 is provided with a first mounting groove 115 and a second mounting groove 116 on opposite sides in the second direction Y, the first transducer 21 is adapted to be fixed in the first mounting groove 115, and the second transducer 22 is adapted to be fixed in the second mounting groove 116.

[0078] The first mounting slot 115 can fix the first transducer 21, and the second mounting slot 116 can fix the second transducer 22, ensuring the installation accuracy of the first transducer 21 and the second transducer 22, improving structural stability, and thus improving the reliability of the ultrasonic metering module 100.

[0079] In some embodiments, such as Figure 4 As shown, the ultrasonic metering module 100 also includes a first latch 117 and a second latch 118. The first latch 117 is adapted to engage with the first mounting groove 115 to fix the first transducer 21 in the first mounting groove 115, and the second latch 118 is adapted to engage with the second mounting groove 116 to fix the second transducer 22 in the second mounting groove 116.

[0080] The engagement of the first latch 117 and the first mounting groove 115 provides a good constraint effect on the first transducer 21, preventing it from shifting, and the assembly process is simple. Similarly, the engagement of the second latch 118 and the second mounting groove 116 provides a good constraint effect on the second transducer 22, preventing the first transducer 21 from shifting, and the assembly process is also simple.

[0081] In some embodiments, such as Figure 1 and Figure 3 As shown, the housing 10 includes an air intake section 12 and a measuring tube section 11 arranged along the first direction X. A flow guide shroud 121 is provided at the end of the air intake section 12 opposite to the measuring tube section 11, and a metering flow channel 111 is disposed inside the measuring tube section 11.

[0082] By using the flow guide 121 installed on the air intake section 12, the gas entering the measuring tube section 11 can be "pre-rectified" to eliminate intake turbulence, reduce smoothness distortion, make the gas flow velocity entering the measuring tube section 11 uniform, and improve the accuracy of measurement.

[0083] In some embodiments, such as Figure 5 As shown, the structure of the fairing 121 is an array of grid structures, and the fairing 121 has a reinforcing rib 1211 in the middle.

[0084] The arrayed grid structure of the flow guide 121 ensures that the gas enters the measuring tube section 11 in a relatively stable state, i.e., a laminar flow state, thus guaranteeing measurement stability. By incorporating reinforcing ribs 1211, the overall structural strength of the flow guide 121 is enhanced, making the grid structure less prone to breakage and improving the service life of the flow guide 121.

[0085] In some embodiments, such as Figure 3 and Figure 4 As shown, the cross-section of the intake section 12 away from the measuring tube section 11 is circular, and the cross-section of the measuring tube section 11 is rectangular.

[0086] The section of the air inlet facing away from the measuring tube 11 has a circular cross-section, which facilitates its fixed connection with the guide shield 121. The measuring tube 11 has a rectangular cross-section, which facilitates the reflection of the ultrasonic waves generated by the transducer 20 by the first inner wall 112 and the second inner wall 113.

[0087] In some embodiments, such as Figures 3-5 As shown, a fixing part 114 is provided at the end of the measuring pipe section 11 opposite to the air intake section 12.

[0088] The fixing part 114 provided at the end of the measuring tube section 11 away from the air inlet section 12 can be used to fix the ultrasonic flow component to other components.

[0089] In some embodiments, the ultrasonic metering module 100 further includes a fixing structure adapted to be connected to the fixing part 114.

[0090] The fixing structure may include a G4 fixing connector or a G6 fixing connector. The G4 fixing connector can be fixedly connected to the adapter of the G4 ultrasonic gas meter, and the G6 fixing connector can be fixedly connected to the adapter of the G6 ultrasonic gas meter, so that the ultrasonic metering module 100 can be used with both G4 and G6 ultrasonic gas meters.

[0091] In some embodiments, such as Figure 6 As shown, the housing 10 is also provided with a third mounting groove 119 for mounting the circuit board 30.

[0092] By integrating the circuit board 30 with the housing 10 through the third mounting slot 119, the overall structural integration can be improved. The circuit board 30 can control the transducer 20 and can also integrate components such as pressure sensors and temperature sensors.

[0093] According to a second aspect of this application, an ultrasonic gas meter is provided, including the ultrasonic metering module 100 as described above.

[0094] The ultrasonic gas meter provided in this application has all the beneficial effects of the ultrasonic metering module 100 as described above, which will not be repeated here.

[0095] The embodiments of this application are further illustrated below with reference to specific examples. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. Experimental methods in the following embodiments that do not specify specific conditions are generally performed according to the conditions recommended by the manufacturer.

[0096] Example 1

[0097] In this embodiment, the ultrasonic metering module 100 includes a housing 10, which includes an air inlet section 12 and a measuring pipe arranged along a first direction X. A metering flow channel 111 extending along the first direction X is provided within the measuring pipe section 11. The housing 10 includes a first inner wall 112 and a second inner wall 113 arranged opposite to each other in the first direction X. A first transducer 21 and a second transducer 22 are respectively disposed on opposite sides of the housing 10 in the second direction Y. The ultrasonic waves emitted by the first transducer 21 are adapted to be reflected sequentially by the second inner wall 113 and the first inner wall 112 before being received by the second transducer 22. The ultrasonic waves emitted by the second transducer 22 are adapted to be reflected sequentially by the first inner wall 112 and the second inner wall 113 before being received by the first transducer 21.

[0098] The incident angles of the first transducer 21 and the second transducer 22 are both 14°. The center distance between the first transducer 21 and the second transducer 22 in the first direction X is 17.12 mm. The width of the metering channel 111 in the second direction Y is 22 mm. The sound path of the ultrasonic wave is 70.75 mm.

[0099] Example 2

[0100] The difference between this embodiment and Embodiment 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 16°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 19.79 mm, and the sound path of the ultrasonic wave is 71.81 mm. All other conditions are the same as in Embodiment 1.

[0101] Example 3

[0102] The difference between this embodiment and Embodiment 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 17.68°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 22.06 mm, and the sound path of the ultrasonic wave is 73.75 mm. The other conditions are the same as in Embodiment 1.

[0103] Example 4

[0104] The difference between this embodiment and Embodiment 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 18°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 22.54 mm, and the sound path of the ultrasonic wave is 73.95 mm. The other conditions are the same as those in Embodiment 1.

[0105] Example 5

[0106] The difference between this embodiment and Embodiment 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 24.57°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 30.24 mm, the width of the metering channel 111 in the second direction Y is 21 mm, and the ultrasonic path is 73.75 mm. All other conditions are the same as in Embodiment 1.

[0107] Example 6

[0108] The difference between this embodiment and Embodiment 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 12.98°, the center-to-center distance between the first transducer 21 and the second transducer 22 in the first direction X is 16.34 mm, the width of the metering channel 111 in the second direction Y is 22.5 mm, and the ultrasonic path is 73.75 mm. All other conditions are the same as in Embodiment 1.

[0109] Comparative Example 1

[0110] The difference between this comparative example and Example 1 is that the structure of the ultrasonic metering module 200 is as follows: Figure 2 As shown, in the ultrasonic metering module 200, the third transducer 23 and the fourth transducer 24 are located on the same side. The ultrasonic wave emitted by the third transducer 23 is received by the fourth transducer 24 after one reflection, and the ultrasonic wave emitted by the fourth transducer 24 is received by the third transducer 23 after one reflection. The incident angles of the third transducer 23 and the fourth transducer 24 are both 40.5°. The center distance between the third transducer 23 and the fourth transducer 24 in the first direction X is 46.5 mm. The width of the metering channel in the second direction Y is 22 mm. The sound path of the ultrasonic wave is 72.24 mm. The remaining conditions are consistent with those in Example 1.

[0111] Comparative Example 2

[0112] The difference between this comparative example and Example 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 12°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 14.51 mm, and the sound path of the ultrasonic wave is 69.81 mm. All other conditions are the same as in Example 1.

[0113] Comparative Example 3

[0114] The difference between this embodiment and Embodiment 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 20°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 25.39 mm, and the sound path of the ultrasonic wave is 74.21 mm. All other conditions are the same as in Embodiment 1.

[0115] Comparative Example 4

[0116] The difference between this embodiment and embodiment 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 22°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 28.32 mm, and the sound path of the ultrasonic wave is 74.61 mm. The other conditions are the same as those in embodiment 1.

[0117] Comparative Example 5

[0118] The difference between this comparative example and Example 1 is that the incident angles of the first transducer 21 and the second transducer 22 are both 24°, the center distance between the first transducer 21 and the second transducer 22 in the first direction X is 31.37 mm, and the sound path of the ultrasonic wave is 77.12 mm. All other conditions are the same as in Example 1.

[0119] Sensitivity, TOF time of flight, and 16L repeatability of the ultrasonic metering module 100 in Examples 1-6 and Comparative Examples 1-5 were tested respectively. For sensitivity testing, the excitation signal was a 20Vpp peak-to-peak square wave with a pulse width of 3 cycles, a pulse repetition interval of 3ms, and a measurement distance of 60mm. The testing equipment used was a RIGOL DS1202 oscilloscope and a RIGOL DG2052 signal generator. The test results are shown in Table 1. For TOF time of flight, a static flight test was performed using a Ti host computer to reflect whether the transducer 20 exhibits zero-ticket phenomenon. The test results are shown in Table 2. For the 16L repeatability test, the ultrasonic metering module 100 was installed in the company's ultrasonic meter and tested using a sonic nozzle method gas meter error verification device (Hangzhou Tianma Measurement GNP-12) at a temperature of 20℃±2℃ and a humidity of 52%. The test results are shown in Table 3.

[0120] Table 1 Comparison of sensitivity test results in different embodiments and comparative examples.

[0121]

[0122]

[0123] As can be seen from Table 1, as the sound path increases, the ultrasonic wave will experience energy attenuation, resulting in a decrease in the received signal strength. Furthermore, ultrasonic waves are easily affected by environmental absorption and scattering, leading to signal attenuation and thus reducing the peak-to-peak value of transducer 20.

[0124] Table 2 Comparison of TOF flight time test results in different embodiments and comparative examples

[0125]

[0126] As can be seen from Table 2, the time-of-flight standard deviation of the ultrasonic metering module 100 in Examples 1-6 is lower than that of the ultrasonic metering module 100 in Comparative Examples 1-5, indicating that the ultrasonic metering module 100 in Examples 1-6 has higher stability, stronger anti-interference ability, and improved overall reliability.

[0127] Table 3. Comparison of repeatability test results of 16L in different embodiments and comparative examples.

[0128]

[0129]

[0130]

[0131]

[0132]

[0133] As can be seen from Table 3, the standard deviation of the ultrasonic metering module 100 in Examples 1-6 is lower than that of the ultrasonic metering module 100 in Comparative Examples 1-5, indicating that the ultrasonic metering module 100 in Examples 1-6 has higher stability, stronger anti-interference ability, and improved overall reliability.

[0134] In summary, the ultrasonic metering module 100 in embodiments 1-6 of this application all satisfy the formula A = -1.23 * H. 2 The requirement of +44.7*Ha ensures that the ultrasonic metrology module 100, while maintaining a compact structure, guarantees measurement sensitivity, reduces ultrasonic attenuation, and improves measurement accuracy. However, the structure of the ultrasonic metrology module 200 in Comparative Example 1 differs from that in Embodiments 1-6 of this application, and the ultrasonic metrology modules 100 in Comparative Examples 2-5 cannot satisfy the formula A = -1.23*H. 2 The requirement of +44.7*Ha resulted in poor overall performance. Therefore, the ultrasonic metering module 100 provided in this application embodiment has achieved unexpected technical effects.

[0135] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0136] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0137] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0138] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An ultrasonic metering module, characterized in that, include: A housing, wherein a metering channel extending along a first direction is provided inside the housing, and the housing includes a first inner wall and a second inner wall disposed opposite to each other in a second direction; the first direction and the second direction are perpendicular to each other; The transducer includes a first transducer and a second transducer. The first transducer is disposed on one side of the first inner wall in the housing, and the second transducer is disposed on one side of the second inner wall in the housing. The ultrasonic waves emitted by the first transducer are adapted to be received by the second transducer after being reflected sequentially by the second inner wall and the first inner wall. The ultrasonic waves emitted by the second transducer are adapted to be received by the first transducer after being reflected sequentially by the first inner wall and the second inner wall. The incident angle of the transducer is A°, and the width of the metering channel along the second direction is Hmm, satisfying: A=-1.23*H 2 +44.7*H-a; Where 370≤a≤374.

5.

2. The ultrasonic metering module according to claim 1, characterized in that, The sound path of the ultrasonic wave emitted by the first transducer is S1, 70mm≤S1≤75mm; And / or, the sound path of the ultrasonic wave emitted by the second transducer is S2, 70mm≤S2≤75mm.

3. The ultrasonic metering module according to claim 1, characterized in that, 14≤A≤22。 4. The ultrasonic metering module according to claim 1, characterized in that, 20≤H≤23。 5. The ultrasonic metering module according to claim 1, characterized in that, The center-to-center distance between the first transducer and the second transducer in the first direction is W, where 17mm ≤ W ≤ 25mm.

6. The ultrasonic metering module according to claim 1, characterized in that, The length of the metering channel along the first direction is L, 40mm≤L≤80mm.

7. The ultrasonic metering module according to any one of claims 1-6, characterized in that, The housing is provided with a first mounting groove and a second mounting groove on opposite sides in the second direction, the first transducer is adapted to be fixed in the first mounting groove, and the second transducer is adapted to be fixed in the second mounting groove.

8. The ultrasonic metering module according to claim 7, characterized in that, The ultrasonic metering module also includes a first buckle and a second buckle; The first buckle is adapted to engage with the first mounting slot to fix the first transducer in the first mounting slot; The second snap-fit ​​is adapted to engage with the second mounting slot to secure the second transducer within the second mounting slot.

9. The ultrasonic metering module according to any one of claims 1-6, characterized in that, The housing includes an air intake section and a measuring pipe section arranged along a first direction; A flow guide is provided at the end of the air intake section opposite to the measuring pipe section, and the metering flow channel is located inside the measuring pipe section.

10. The ultrasonic metering module according to claim 9, characterized in that, The measuring tube section is fixed at the end opposite to the air intake section.

11. An ultrasonic gas meter, characterized in that, Includes the ultrasonic metering module as described in any one of claims 1-10.

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