Ultrasonic metering device

Abstract

The invention discloses an ultrasonic metering device, which belongs to the technical field of metering meters and solves the problem that the existing ultrasonic metering device cannot meet the accuracy requirements of small flow measurement of household gas meters. The ultrasonic metering device of the invention comprises a shell and a transducer arranged on the shell, wherein a metering channel for fluid to pass through is arranged in the shell, and the shell forms an inlet section and a measuring section along the flow direction of the fluid, and the transducer comprises a transmitting vibrator and a receiving vibrator, wherein the transmitting vibrator and the receiving vibrator are installed on the same side of the measuring section so that the propagation path of the ultrasonic wave is V-shaped, the flow area of ​​the inlet section is S1, and the flow area of ​​the measuring section is S2, wherein S2<S1. The surface velocity of the fluid when flowing through the measuring section is increased, the flight time difference during ultrasonic measurement is increased, and the measurement accuracy is improved, especially the measurement accuracy requirements of small flow conditions are met.

Description

[Technical field]

[0001] The invention relates to the technical field of meters, and in particular to an ultrasonic metering device in an ultrasonic meter. [Background technology]

[0002] Ultrasonic meters have been widely used as a velocity meter for household natural gas metering. This gas meter measures the fluid flow rate by the difference in the flight time between the downstream flight time and the upstream flight time of the ultrasonic wave in the fluid, and then obtains the fluid flow rate. According to this measurement principle, for the characteristics of the small lower limit of the flow rate of the household gas meter, improving the flight time difference when measuring the small flow rate is conducive to improving the measurement accuracy of the household gas meter at a small flow rate. In addition, since the household natural gas medium contains pollutants such as fine particles, dust and dust, the inner wall of the fluid flow channel will accumulate pollutants after long-term use, thereby affecting the measurement accuracy. In the prior art, a concave arc groove is set on the inner wall of the fluid flow channel. The arc groove has the effect of gathering waves, so that most of the ultrasonic waves can be received after reflection, thereby improving the measurement accuracy. However, in actual applications, pollutants such as fine particles, dust and dust in the gas are more likely to accumulate in the arc groove, which will affect the measurement accuracy of the ultrasonic meter. Therefore, how to meet the measurement accuracy requirements of small flow rates of household ultrasonic gas meters and achieve pollution resistance is an urgent problem to be solved. [Summary of the invention]

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an ultrasonic metering device to improve measurement accuracy, especially to meet the measurement accuracy requirements at small flow rates.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An ultrasonic metering device comprises a shell and a transducer arranged on the shell, wherein a metering channel for fluid to pass through is arranged in the shell, and the shell forms an inlet section and a measuring section along the flow direction of the fluid, and the transducer comprises a transmitting vibrator and a receiving vibrator, wherein the transmitting vibrator and the receiving vibrator are installed on the same side of the measuring section so that the propagation path of the ultrasonic wave is V-shaped, the flow area of ​​the inlet section is S1, and the flow area of ​​the measuring section is S2, wherein S2<S1.

[0006] In the above-mentioned ultrasonic measuring device, a reflecting boss for reflecting ultrasonic waves is formed on the other side of the measuring section opposite to the transducer.

[0007] In the above ultrasonic measuring device, the reflecting boss includes a planar reflecting portion, and the ultrasonic wave emitted by the transmitting vibrator is reflected to the receiving vibrator via the reflecting portion. The length of the reflecting portion is L1, and the distance between the transmitting vibrator and the receiving vibrator is L2, wherein L1≥L2.

[0008] In the above-mentioned ultrasonic measuring device, the transmitting vibrator and the receiving vibrator are symmetrically distributed on both sides of the center line of the reflecting part.

[0009] In the above ultrasonic metering device, a side of the reflecting boss close to the inlet section has a sloped inlet transition portion, and the reflecting portion is connected to the inlet transition portion in an arc transition.

[0010] In the above ultrasonic metering device, the inclination angle of the inflow transition portion relative to the reflection portion is α, wherein 30°≤α≤60°.

[0011] In the above-mentioned ultrasonic measuring device, the reflecting boss is formed by a concave portion of the side wall of the measuring section.

[0012] In the above-mentioned ultrasonic measuring device, the protrusion height of the reflective boss relative to the inner surface of the measuring section is H, wherein 1mm≤H≤3mm.

[0013] In the above-mentioned ultrasonic measuring device, an angle θ is formed between the ultrasonic propagation path emitted by the transmitting vibrator and the ultrasonic propagation path received by the receiving vibrator, wherein 30°≤θ≤120°.

[0014] In the above-mentioned ultrasonic metering device, the shell also includes an outflow section, the flow area of ​​the outflow section is S3, wherein S2<S3, the measuring section is located between the inflow section and the outflow section, and a sloped outflow transition section is connected between the measuring section and the outflow section.

[0015] Beneficial effects of the present invention:

[0016] The ultrasonic metering device of the present invention comprises a shell and a transducer arranged on the shell, wherein a metering channel for fluid to pass through is arranged in the shell, and the shell forms an inlet section and a measuring section along the flow direction of the fluid, and the transducer comprises a transmitting vibrator and a receiving vibrator, and the transmitting vibrator and the receiving vibrator are installed on the same side of the measuring section so that the propagation path of the ultrasonic wave is V-shaped, the flow area of ​​the inlet section is S1, and the flow area of ​​the measuring section is S2, wherein S2<S1.

[0017] Firstly, the transmitting vibrator and the receiving vibrator are installed on the same side of the measuring section, so that the propagation path of the ultrasonic wave is V-shaped, which increases the travel of the ultrasonic wave in the metering channel, and is conducive to increasing the flight time difference between the downstream flight time and the upstream flight time, so as to obtain higher measurement accuracy; secondly, the flow area of ​​the inlet section is larger than the flow area of ​​the measuring section, so that the surface velocity of the fluid when flowing through the measuring section increases, and for the time difference measurement principle, the surface flow velocity is proportional to the flight time difference, so the measuring section set in the present invention can increase the flight time difference during ultrasonic measurement, thereby improving the measurement accuracy, especially meeting the measurement accuracy requirements under small flow conditions.

[0018] Furthermore, a reflective boss for reflecting ultrasonic waves is formed in the measuring section on the other side relative to the transducer. First, the reflective boss protrudes toward the axial direction of the metering channel, so that the flow area of ​​the measuring section where the reflective boss is located becomes smaller, so that the surface velocity of the fluid flowing through the measuring section increases; secondly, the reflective boss is used to block and rebound dust and small particles in the airflow, which has the effect of self-purging and self-cleaning, effectively improving the deposition of pollutants such as fine particles, dust and dirt in the measuring section, ensuring the measurement accuracy while extending the service life of the metering device.

[0019] Furthermore, the reflecting boss includes a planar reflecting portion, and the ultrasonic wave emitted by the transmitting vibrator is reflected to the receiving vibrator through the reflecting portion, the length of the reflecting portion is L1, and the distance between the transmitting vibrator and the receiving vibrator is L2, wherein L1≥L2. Firstly, the planar reflecting portion is provided to ensure that the ultrasonic wave is reflected on a smooth and flat surface, reduce the diffuse reflection of the ultrasonic wave, and make most of the ultrasonic wave be within the receiving range of the receiving vibrator after being reflected by the reflecting portion, thereby improving the measurement precision and increasing the measurement accuracy; secondly, the purpose of designing the reflecting boss of the present invention is to reduce the flow area of ​​the measuring section to increase the surface flow velocity of the fluid when passing through the measuring section. In this scheme, the length of the reflecting portion (the length of the reflecting portion in the axial direction of the metering channel) is not less than the distance between the transmitting vibrator and the receiving vibrator, which can at least ensure that the fluid can obtain a stable surface flow velocity greater than the inlet section when flowing through the area where the ultrasonic V-shaped propagation path is located, so that the metering device can measure more accurately and stably.

[0020] Furthermore, the transmitting vibrator and the receiving vibrator are symmetrically distributed on both sides of the center line of the reflecting part. According to the measurement principle of the time difference method, the downstream flight time and the upstream flight time must be considered at the same time. The transmitting vibrator and the receiving vibrator are symmetrically distributed on both sides of the center line of the reflecting part, so that the fluid surface flow velocity on the transmitting vibrator side and the receiving vibrator side is basically consistent, so that the measured flight time difference is more accurate, which is conducive to improving the measurement accuracy.

[0021] Furthermore, the side of the reflective boss close to the inlet section has a sloped inlet transition portion, and the reflective portion is connected to the inlet transition portion by an arc transition. The inlet transition portion acts as a fluid buffer, allowing the fluid to smoothly transition from the inlet section to the measuring section, reducing the eddy current phenomenon generated on the side of the reflective boss close to the inlet section, thereby reducing the influence of unstable changes in the flow field in the metering channel on the metering accuracy.

[0022] Furthermore, the reflective boss is formed by the concave side wall of the measuring section, that is, the reflective boss is integrally formed with the housing, the structural design is simple, easy to implement, and the housing volume of the metering device can be reduced, making it easy to install.

[0023] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0024] The present invention will be further described below in conjunction with the accompanying drawings:

[0025] Figure 1 Schematic cross-sectional view of an ultrasonic measuring device in an embodiment of the present invention.

[0026] Reference numerals:

[0027] 100 housing, 110 inlet section, 120 measuring section, 130 outlet section, 140 metering channel, 141 inlet, 142 outlet, 150 reflecting boss, 151 reflecting part, 152 inlet transition part, 153 outlet transition part

[0028] 200 Transmitter

[0029] 300 receiving vibrator [Specific implementation method]

[0030] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] Reference Figure 1 The ultrasonic metering device provided in the embodiment of the present invention comprises a shell 100 and a transducer arranged on the shell 100. The shell 100 is roughly in the shape of a rectangular parallelepiped. The front and rear ends of the shell 100 respectively form an inlet 141 and an outlet 142. A metering channel 140 is formed in the shell 100 to connect the inlet 141 and the outlet 142 for fluid to pass through. The shell 100 forms an inlet section 110, a measuring section 120 and an outlet section 130 along the flow direction of the fluid. The gas enters the inlet section 110 through the inlet 141, passes through the measuring section 120 and the outlet section 130 in turn, and then flows into the gas from the outlet 142. In the embodiment of the present invention, on the same side of the measuring section 120 (such as Figure 1The transmitting vibrator 200 and the receiving vibrator 300 are installed at intervals along the axial direction of the metering channel 140 (on the upper side of the measuring section 120 shown in the figure). According to the measurement principle of the time difference method, it can be understood that the transmitting vibrator 200 described in this embodiment can both transmit ultrasonic waves and receive reflected ultrasonic waves, and the receiving vibrator 300 can both receive reflected ultrasonic waves and transmit ultrasonic waves. The transmitting vibrator 200 is installed in a manner that its ultrasonic transmitting and receiving surface is tilted toward the outlet 142, and the receiving vibrator 300 is installed in a manner that its ultrasonic transmitting and receiving surface is tilted toward the inlet 141. The ultrasonic wave flies downstream in the fluid: the transmitting vibrator 200 transmits the ultrasonic wave, which is reflected by the inner wall of the measuring section 120 and received by the receiving vibrator 300, and the ultrasonic wave forms a V-shaped propagation path in the measuring section 120; the ultrasonic wave flies upstream in the fluid: the receiving vibrator 300 transmits the ultrasonic wave, which is reflected by the inner wall of the measuring section 120 and received by the transmitting vibrator 200, and the ultrasonic wave also forms a V-shaped propagation path in the measuring section 120. The propagation path of the ultrasonic wave is V-shaped, which increases the travel of the ultrasonic wave in the metering channel 140, which is beneficial to increase the flight time difference between the downstream flight time and the upstream flight time to obtain higher measurement accuracy; and the transmitting vibrator 200 and the receiving vibrator 300 are arranged on the same side of the measuring section 120, which can shorten the connection length between the transducer and the metering circuit board, miniaturize the metering circuit board, and save installation space.

[0036] Ultrasonic metering device for measuring fluid flow Q v , fluid flow Q v =S×V, where S is the flow area of ​​the channel, V is the surface velocity, and the fluid flow rate Q v Under the same conditions, the smaller the flow area S, the greater the flow velocity on the V surface. In the time difference method measurement: ultrasonic downstream flight time Ultrasonic counter-flow time of flight Therefore, the flight time difference Because the propagation speed of ultrasound is much greater than the fluid flow rate, the flight time difference can be simplified as: Wherein, L is the ultrasonic wave propagation distance, C is the ultrasonic wave propagation speed, and α is the angle between the ultrasonic wave propagation path and the axial direction of the channel. It can be seen that the surface flow velocity V of the fluid is proportional to the flight time difference △t. In addition to the above-mentioned V-shaped ultrasonic wave propagation path, which can increase the flight time difference △t, increasing the surface flow velocity V can also increase the flight time difference △t, thereby improving the measurement accuracy. Therefore, in this embodiment, the flow area of ​​the inlet section 110 is S1, and the flow area of ​​the measuring section 120 is S2, wherein S2<S1, so that the surface velocity of the fluid when flowing through the measuring section 120 increases, and the flight time difference during ultrasonic measurement is increased, thereby improving the measurement accuracy, especially meeting the measurement accuracy requirements of household gas meters at small flow rates. Exemplary: In a flow measurement example, the inlet flow rate is 0.016m 3 / h, according to the existing metering device, the cross-sectional area of ​​the metering channel 140 is 198mm 2 The measured difference between the ultrasonic downstream flight time and the upstream flight time is 18.8 ns. After adopting the design of the present invention, the flow area of ​​the measuring section 120 (the cross-sectional area of ​​the metering channel 140 at the measuring section 120) is 180 mm 2 The measured flight time difference between the ultrasonic downstream flight time and the upstream flight time is 22ns. Compared with the existing technology, the flight time difference has increased by 17%, and the corresponding flow measurement accuracy has also been improved.

[0037] Reference Figure 1 According to one embodiment of the present invention, on the other side of the measuring section 120 relative to the transducer (eg Figure 1 A reflecting boss 150 for reflecting ultrasonic waves is formed on the lower side of the measuring section 120 as shown, and the reflecting boss 150 protrudes toward the axial direction of the metering channel 140, so that the flow area of ​​the measuring section 120 where the reflecting boss 150 is located becomes smaller, so that the surface velocity of the fluid when flowing through the measuring section 120 increases; secondly, the reflecting boss 150 is utilized to block and rebound dust and small particles in the airflow, thereby achieving the effect of self-purging and self-cleaning, effectively improving the deposition problem of pollutants such as fine particles, dust and dirt in the measuring section 120, ensuring the measurement accuracy while extending the service life of the metering device. Preferably: the protruding height of the reflective boss 150 relative to the inner surface of the measuring section 120 is H, 1mm≤H≤3mm. When H<1mm, the difference in flow area between the inlet section 110 and the measuring section 120 is too small, resulting in too small an increase in the surface flow velocity of the fluid in the measuring section 120, which is not conducive to achieving the purpose of the present invention. When H>3mm, while increasing the surface flow velocity, it also forms a greater flow resistance to the fluid, which can easily cause a disorder in the fluid flow field in the metering channel 140 and affect the measurement accuracy. Therefore, H is limited to the range of 1mm~3mm. Optional: H is 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0038] According to the above-mentioned embodiment, the reflecting boss 150 includes a planar reflecting portion 151. The ultrasonic wave emitted by the transmitting vibrator 200 is reflected to the receiving vibrator 300 via the reflecting portion 151. Similarly, the ultrasonic wave emitted by the receiving vibrator 300 can also be reflected to the transmitting vibrator 200 via the reflecting portion 151. The ultrasonic wave is reflected on the smooth and highly flat reflecting portion 151, which reduces the diffuse reflection of the ultrasonic wave, so that most of the ultrasonic wave can be within the receiving range of the receiving vibrator 300 after being reflected by the reflecting portion 151, thereby improving the measurement precision and increasing the measurement accuracy. Preferably: the transmitting vibrator 200 and the receiving vibrator 300 are symmetrically distributed on both sides of the center line of the reflecting part 151, so that the surface flow velocity of the fluid on the side of the transmitting vibrator 200 and the side of the receiving vibrator 300 is basically consistent, so that the flight time difference measured is more accurate, which is conducive to improving the metering accuracy; the length of the above-mentioned reflecting part 151 is L1, and the distance between the transmitting vibrator 200 and the receiving vibrator 300 is L2, L1≥L2, at least it can ensure that the fluid can obtain a stable surface flow velocity greater than the inlet section 110 when flowing through the metering channel 140 located between the transmitting vibrator 200 and the receiving vibrator 300, that is, the area where the ultrasonic V-shaped propagation path is located, so that the metering of the metering device is more accurate and stable.

[0039] According to the above embodiment, an angle θ is formed between the ultrasonic propagation path emitted by the transmitting vibrator 200 and the ultrasonic propagation path received by the receiving vibrator 300, and the angle θ is 30°≤θ≤120°. When θ<30°, the distance between the transmitting vibrator 200 and the receiving vibrator 300 is too small, which is not only inconvenient to install, but also has the problem of signal interference. When θ>120°, in order to meet the measurement accuracy requirement, it is necessary to increase the length of the reflecting part 151, so that the volume of the housing 100 of the metering device is increased, the cost is increased and it is not conducive to installation. Therefore, θ is limited to the range of 30° to 120°, and optional: θ is 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, etc.

[0040] According to the above-mentioned embodiment, the setting of the reflecting boss 150 increases the flow resistance of the fluid, especially the eddy current generated by the collision of the reflecting boss 150 on the side close to the inlet section 110 with the fluid will affect the metering accuracy. For this reason, in this embodiment, a sloped inlet transition portion 152 is set on the side close to the inlet section 110 of the reflecting boss 150, and the reflecting portion 151 is connected to the inlet transition portion 152 by an arc transition. The inlet transition portion 152 plays a role of fluid buffering, so that the fluid can smoothly transition from the inlet section 110 to the measuring section 120, reduce the eddy current phenomenon generated on the side of the reflecting boss 150 close to the inlet section 110, and further reduce the influence of the unstable changes of the flow field in the metering channel 140 on the metering accuracy. Specifically: the above-mentioned sloped inlet transition portion 152 can be an inclined surface or an arc surface with a certain degree of curvature. The inclination angle of the inlet transition portion 152 relative to the reflecting portion 151 is α, 30°≤α≤60°. When α<30°, the inlet transition portion 152 tends to be flat, which weakens the self-purge and self-cleaning effects of the reflecting boss 150. When α>60°, the inlet transition portion 152 causes greater resistance to the fluid and is prone to form vortices. Therefore, α is limited to the range of 30°~60°. Optional: α is 30°, 35°, 40°, 50°, 55°, 60°, etc.

[0041] According to the above-mentioned embodiment, the flow area of ​​the outflow section 130 is S3, S2<S3, the measuring section 120 is located between the inlet section 110 and the outflow section 130, the shell 100 forms a structure with wider ends and narrower middle, and a sloped outflow transition portion 153 is connected between the measuring section 120 and the outflow section 130, so that the fluid can smoothly transition from the measuring section 120 to the outflow section 130, thereby increasing the smoothness of the fluid output from the outflow section 130.

[0042] The reflective boss 150 in the embodiment of the present invention is formed by the concave side wall of the measuring section 120, that is, the reflective boss 150 is integrally formed with the housing 100, and the structural design is simple and easy to implement, and the volume of the housing 100 of the metering device can be reduced, and it is easy to install. In other embodiments, the housing shape of the metering device is not changed, and a reflective boss is separately provided on the inner wall of the housing to meet the requirements of the present invention.

[0043] According to the design principle of the present invention, the relative arrangement of the reflective boss and the transducer in this embodiment is only a preferred scheme. In other embodiments, one side of the measuring section where the transducer is installed is recessed into the metering channel, or both sides of the measuring section are recessed into the metering channel, and the transducer is installed on one of the sides. Such schemes can achieve the purpose of the present invention, that is, the flow area S2 of the measuring section is smaller than the flow area S2 of the inlet section, thereby improving the measurement accuracy, especially meeting the measurement accuracy requirements under small flow conditions.

[0044] The above-mentioned embodiment of the present invention is applied to an ultrasonic meter, which includes a base meter. The base meter is provided with a fluid inlet end and a fluid outlet end. Usually, a control valve is installed at the fluid inlet end. When an abnormal state occurs during the use of the ultrasonic meter, the air intake can be cut off by the control valve to ensure safe use. The ultrasonic metering device is preferably installed at the fluid outlet end. The control valve and the ultrasonic metering device do not interfere with each other, which not only realizes accurate metering of the gas, but also ensures the working reliability of the control valve.

[0045] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. An ultrasonic metering device, comprising a housing and a transducer arranged on the housing, wherein a metering channel for fluid to pass through is provided in the housing, characterized in that: The shell forms an inlet section and a measuring section along the fluid flow direction, the transducer includes a transmitting vibrator and a receiving vibrator, the transmitting vibrator and the receiving vibrator are installed on the same side of the measuring section so that the propagation path of the ultrasonic wave is V-shaped, the flow area of ​​the inlet section is S1, and the flow area of ​​the measuring section is S2, wherein S2<S1; a reflecting boss for reflecting ultrasonic waves is formed on the other side of the measuring section relative to the transducer, the reflecting boss is formed by the concave side wall of the measuring section, and one side of the measuring section where the transducer is installed is at the same horizontal height as one side of the inlet section; the protrusion height of the reflecting boss relative to the inner surface of the measuring section is H, wherein 1mm≤H≤3mm.

2. The ultrasonic measuring device according to claim 1, characterized in that: The reflective boss comprises a planar reflective portion, and the ultrasonic wave emitted by the transmitting vibrator is reflected by the reflective portion to the receiving vibrator. The length of the reflective portion is L1, and the distance between the transmitting vibrator and the receiving vibrator is L2, wherein L1≥L2.

3. The ultrasonic measuring device according to claim 2, characterized in that: The transmitting vibrator and the receiving vibrator are symmetrically distributed on both sides of the center line of the reflecting part.

4. The ultrasonic measuring device according to claim 2, characterized in that: A sloped inlet transition portion is provided on one side of the reflective boss close to the inlet section, and the reflective portion is connected to the inlet transition portion in an arc transition.

5. The ultrasonic measuring device according to claim 4, characterized in that: The inclination angle of the inflow transition portion relative to the reflection portion is α, wherein 30°≤α≤60°.

6. The ultrasonic measuring device according to any one of claims 1 to 5, characterized in that: An angle θ is formed between the propagation path of the ultrasonic wave emitted by the transmitting vibrator and the propagation path of the ultrasonic wave received by the receiving vibrator, wherein 30°≤θ≤120°.

7. The ultrasonic measuring device according to any one of claims 1 to 5, characterized in that: The shell also includes an outflow section, the flow area of ​​the outflow section is S3, wherein S2<S3, the measuring section is located between the inflow section and the outflow section, and a sloped outflow transition section is connected between the measuring section and the outflow section.

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