A multi-channel ultrasonic flow meter

Abstract

The utility model relates to ultrasonic flowmeter technical field especially relates to a kind of multi-channel ultrasonic flowmeter, including flowmeter body, at the pipe wall of flowmeter body is provided with: at least one measurement layer, measurement layer is made of ultrasonic transducer A, ultrasonic transducer B and ultrasonic transducer C constitute V type sound channel structure;Ultrasonic transducer A and ultrasonic transducer C are installed to the pipe wall opposite sides of flowmeter body with identical angle α symmetry, and its axis prolongation line intersects opposite pipe wall;Ultrasonic transducer B is installed to the pipe wall of flowmeter body, and its axis prolongation line is perpendicular to the end surface center line of ultrasonic transducer A and ultrasonic transducer C, and intersect at midpoint of line;The axis line of ultrasonic transducer A, ultrasonic transducer B and ultrasonic transducer C is in the same plane.The utility model can realize accurate flow measurement, and can complete accurate sound velocity and delay time measurement.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic flow meter technology, and in particular to a multi-channel ultrasonic flow meter. Background Technology

[0002] Currently, ultrasonic gas flow meters are widely used in public sectors such as natural gas metering. Their metering accuracy and stability directly impact the economic interests of both parties in trade, and economic disputes arising from metering deviations directly affect economic development and social stability. Traditional ultrasonic flow meters typically employ a dual-transducer configuration to form a through-beam or reflective (reflective) sound channel. One metering cycle provides two measurement times, upstream and downstream, and the gas velocity and sound velocity are derived using the time difference method. However, actual application environments are far more complex. Temperature, pressure, and composition all affect metering accuracy and stability. Furthermore, considering investment efficiency, most domestic trade metering sites use single-flow meter configurations without series comparison meters. This means that the metering results of a single flow meter are in a blind box state; the accuracy of the measurement is unknown on-site. Only after a two-year recalibration cycle can the existence of metering deviations be determined, but the timing, magnitude, and cause of the deviation remain unclear.

[0003] As intelligent instruments, ultrasonic gas flow meters can reveal their health status and the changes in the measurement environment through methods such as gain, signal-to-noise ratio, and sound velocity verification. However, real-world application environments are not always ideal, like those in a laboratory. Airflow disturbances and transducer time delays introduce uncertainty, making it impossible to accurately measure sound velocity in the field, regardless of whether the sound is emitted through or reflected. This impacts sound velocity verification. Therefore, existing intelligent diagnostic technologies are significantly less effective without this fundamental indicator of in-situ sound velocity verification. Utility Model Content

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a multi-channel ultrasonic flow meter, including a flow meter body, wherein the following are provided on the pipe wall of the flow meter body:

[0005] At least one measuring layer, wherein the measuring layer is composed of ultrasonic transducers A, B and C forming a V-shaped acoustic channel structure; ultrasonic transducers A, B and C are all installed on the flow meter body and have multiple transducer mounting holes.

[0006] The ultrasonic transducers A and C are symmetrically installed on opposite sides of the pipe wall of the flow meter body at the same included angle α, and their extended axes intersect on the opposite pipe wall.

[0007] The ultrasonic transducer B is installed on the pipe wall of the flow meter body, and its extended axis is perpendicular to the line connecting the center of the end faces of ultrasonic transducers A and C, and intersects at the midpoint of the line.

[0008] The centerlines of ultrasonic transducers A, B, and C are in the same plane.

[0009] Furthermore, the number of the measuring layers is multiple, including at least one radial measuring layer and at least one chordal measuring layer, arranged in parallel on the flow meter body;

[0010] In the radial measurement layer, the extended axis of the ultrasonic transducer B passes through the axis of the flow meter body;

[0011] In the chordal measurement layer, a reflector E is provided at the position where the extended axis of the ultrasonic transducer B intersects with the tube wall, and the reflector E is installed in the reflector mounting hole.

[0012] Furthermore, the included angle α is 68°;

[0013] The intersection point of ultrasonic transducers A and C on the opposite pipe wall coincides with the center point of the end face of ultrasonic transducer B.

[0014] Furthermore, a wire protection cover A is provided at the front end of the flow meter body, and a wire protection cover B is provided at the rear end of the flow meter body. The wire protection cover A is fixed to the front end of the flow meter body by bolts and fixing screw holes A, and the wire protection cover B is fixed to the rear end of the flow meter body by bolts and fixing screw holes B.

[0015] Furthermore, the flow meter body is also provided with a transducer wire collection hole, a temperature sensor mounting hole, and a pressure tapping hole; the flow meter body is provided with a fluid flow direction indicator to indicate the fluid flow direction.

[0016] Furthermore, the flow meter body is also provided with a vertical transducer mounting hole for mounting a vertical ultrasonic transducer, and the axis of the vertical transducer mounting hole is perpendicular to the axis of the flow meter body.

[0017] Furthermore, the ultrasonic transducer B is installed inside the vertical transducer mounting hole, and the ultrasonic transducer B, together with the reflector E of the chordal measurement layer or the tube wall of the radial layer, forms a vertical reflection channel perpendicular to the axis of the surface body.

[0018] Furthermore, the vertical reflection channel is used to obtain two reflection times T within one measurement cycle. BB1 and T BB2 Thus, the delay time t of ultrasonic transducer B can be obtained. BD =(2T BB1 -TBB2 ) / 2, and the speed of sound in the medium C=2L3 / (T) BB2 -T BB1 ).

[0019] The advantages of this utility model are:

[0020] 1. This invention employs a V-shaped acoustic channel structure composed of ultrasonic transducers A, B, and C. The centerlines of the three transducers are located in the same plane, forming an equilateral triangle measurement layout. This innovative structure allows for eight time measurements to be obtained in a single measurement cycle. Through cross-comparison verification of multi-path measurement data, the measurement accuracy of gas flow velocity and sound velocity is significantly improved. Compared with the traditional dual-transducer through-beam structure, this invention improves measurement accuracy and effectively solves the measurement deviation problem caused by changes in temperature, pressure, and composition in the prior art.

[0021] 2. This invention features multiple parallel measurement layers arranged on the flowmeter body, including at least one radial measurement layer and at least one chordal measurement layer. The extended axis of the ultrasonic transducer B in the radial measurement layer passes through the flowmeter body's axis, accurately measuring the flow velocity at the pipe's center. The chordal measurement layer has a reflector E positioned at the intersection of the extended axis of the ultrasonic transducer B and the pipe wall, measuring the flow velocity at the pipe's edge. This multi-layered, three-dimensional measurement network comprehensively captures the flow field distribution within the pipe, solving the problem of "blind box" measurement results from a single flowmeter in the prior art, and achieving accurate measurement of flow velocity across the entire cross-section.

[0022] 3. This invention optimizes the installation angle α between ultrasonic transducers A and C to 68°. This large angle design reduces the protrusion depth of the transducer end face into the internal cavity of the flow meter from 5.30mm in the traditional 45° angle to 2.81mm, a reduction of 47%. This significantly reduces the turbulent flow generated by the protruding part of the transducer under high flow velocity conditions, enabling the flow meter to maintain stable measurement over a wide flow velocity range of 0.3-120m / s, thus solving the measurement instability problem caused by flow disturbance in the prior art.

[0023] 4. In the chordal measurement layer, this invention places a reflector E at the intersection of the extended axis of the ultrasonic transducer B and the pipe wall. By measuring the round-trip propagation time of the ultrasonic signal between transducer B and reflector E, the actual sound velocity at the scene can be accurately calculated. This design enables real-time verification of the sound velocity at the application site, providing reliable basic data for intelligent diagnosis and solving the problem of low efficiency in intelligent diagnosis of sound velocity verification caused by the lack of accurate on-site sound velocity measurement in existing technologies. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0026] Figure 2 This is a schematic diagram of the rear view structure of this utility model.

[0027] Figure 3 This is a schematic diagram of the internal structure of the concealed wire protection cover A of this utility model.

[0028] Figure 4 This is a schematic diagram of the internal structure of the concealed wire protection cover B of this utility model.

[0029] Figure 5 This is a schematic diagram of the radial measurement channel arrangement of the multi-channel ultrasonic flowmeter in this utility model.

[0030] Figure 6 This is a schematic diagram of the chordal measurement channel arrangement of the multi-channel ultrasonic flowmeter in this utility model.

[0031] Figure 7 and Figure 8 These are all schematic diagrams of transducer installation at different angles.

[0032] In the diagram: 1. Flow meter body; 2. Wire protection cover A; 3. Transducer wire collection hole; 4. Temperature sensor mounting hole; 5. Pressure tap hole; 6. Wire protection cover B; 7. Reflector mounting hole; 8. Transducer mounting hole; 9. Fixing screw hole A; 10. Transducer wire through hole A; 11. Fluid flow direction indicator; 12. Ultrasonic transducer A; 13. Ultrasonic transducer B; 14. Ultrasonic transducer C; 15. Vertical transducer mounting hole; 16. Transducer wire through hole B; 17. Fixing screw hole B. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Example 1:

[0036] Figure 1 This is a three-dimensional structural diagram of the present invention. Figure 2 This is a schematic diagram of the rear view structure of this utility model. Figure 3 This is a schematic diagram of the internal structure of the concealed wire protection cover A2 of this utility model. Figure 4 This is a schematic diagram of the internal structure of the concealed wire protection cover B6 of this utility model. Figure 5 This is a schematic diagram of the radial measurement channel arrangement of the multi-channel ultrasonic flowmeter in this utility model. Figure 6 This is a schematic diagram of the chordal measurement channel arrangement of the multi-channel ultrasonic flowmeter in this utility model. Figure 7 and Figure 8 These are all schematic diagrams showing transducer installations at different angles. For example... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, this utility model provides a multi-channel ultrasonic flow meter, which consists of two three-transducer V-shaped channel measurement layers arranged chordally and parallel to each other on the ultrasonic flow meter body 1, and one measurement layer arranged radially and parallel to each other. Through a special acoustic path design, the number of time data points for a single measurement of each channel is increased from 2 to 8, thereby improving the measurement accuracy; and a six-channel ultrasonic flow meter is built by installing 9 ultrasonic transducers.

[0037] The radially parallel arrangement of the measurement layer, with ultrasonic transducers A12 and C14 symmetrically installed on the flowmeter pipe wall at the same included angle α, the radial layer measures the central flow velocity and the chordal layer measures the edge flow velocity, comprehensively reflecting the flow velocity distribution. The extended lines of the axes of ultrasonic transducers A12 and C14 pass through the axis of the meter body and intersect on the opposite pipe wall, forming an equilateral triangle measurement layer that passes through the axis of the flowmeter body 1.

[0038] The radially parallel arrangement of the measurement layers, the intersection of the extended axis of ultrasonic transducer B13 and the pipe wall is a regular symmetrical curved surface, the end face of the pipe wall reflects the ultrasonic signal emitted by ultrasonic transducer B13 and is received by ultrasonic transducer B13, as shown in the attached figure. Figure 5 As shown, the measurement layers are arranged radially, and eight time measurements are obtained in each measurement cycle. These eight time measurements, after zero-flow correction, provide accurate transit time, medium sound velocity, and delay time of each transducer, as well as precise flow rate values, in practical applications. Furthermore, by comparing three flow rate values ​​on the same radially arranged measurement plane, changes in gas flow regime can be evaluated online.

[0039] The eight time measurements (in this specification, time measurements are represented by uppercase "T", and decomposed time values ​​are represented by lowercase "t"):

[0040] T AB Ultrasonic transducer A transmits signals, ultrasonic transducer B receives signals, and the transmission time is timed.

[0041] T BC The ultrasonic transducer A emits a signal, and the ultrasonic transducer B receives the signal. Using this as a time node, the time signal is refracted from the ultrasonic transducer B and received by the ultrasonic transducer C is the transmission time of the signal.

[0042] T AC Ultrasonic transducer A transmits signals, ultrasonic transducer C receives signals, and the transmission time is timed.

[0043] T CB : Ultrasonic transducer C transmits the signal, ultrasonic transducer B receives the signal, and the time of transmission received is timed;

[0044] T BA The ultrasonic transducer C emits a signal, and the ultrasonic transducer B receives the signal. Using this as a time node, the timing signal is refracted from the ultrasonic transducer B, and the ultrasonic transducer A receives the signal's transmission time.

[0045] T CA : Ultrasonic transducer C transmits the signal, ultrasonic transducer A receives the signal; the time of transmission received is timed;

[0046] T BB1The time required for the ultrasonic transducer B to receive the first reflected signal after it is emitted by the ultrasonic transducer B and reflected by the tube wall (or reflector E);

[0047] T BB2 The time required for the ultrasonic transducer B to emit a signal, which is reflected a second time by the tube wall (reflector), and for the ultrasonic transducer B to receive the second reflected signal.

[0048] The chordally parallel measurement layer consists of ultrasonic transducers A12 and C14 symmetrically mounted on the pipe wall of the flowmeter body 1 at the same included angle α. The extended axes of ultrasonic transducers A12 and C14 intersect on the opposite pipe wall, forming an equilateral triangle measurement layer parallel to the radial measurement layer. The intersection point of ultrasonic transducers A12 and C14 on the opposite pipe wall coincides with the center point of the end face of ultrasonic transducer B13. The extended axis of ultrasonic transducer B13 is perpendicular to the line connecting the centers of the end faces of ultrasonic transducers A12 and C14, intersecting at 1 / 2. The axis of ultrasonic transducer B13 is in the same plane as the axes of ultrasonic transducers A12 and C14 to ensure that the ultrasonic signal emitted by ultrasonic transducer A12, after being reflected (refracted) by the end face of ultrasonic transducer B13, can accurately reach the end face of transducer C and be received.

[0049] The parallel chordal arrangement of the measurement layer, where the extended axis of the ultrasonic transducer B13 intersects the tube wall at an irregular curved surface, requires the installation of a cylindrical reflector E with a cross-sectional area not smaller than that of the transducer and coaxial with the ultrasonic transducer B13. This reflector E, whose front end reflects the ultrasonic signal emitted by the ultrasonic transducer B13, is then received by the transducer B13. (See attached diagram.) Figure 6 As shown. Equivalent to a radially arranged measurement layer, a chordally arranged measurement layer will obtain eight time measurements per metering cycle. Through these eight time measurements, after zero-flow correction, accurate transit time, medium sound velocity, and delay time of each transducer, as well as accurate flow rate values, can be obtained in practical applications. At the same time, gas flow regime changes can be evaluated online by comparing three flow velocity values ​​on the same chordally arranged measurement plane.

[0050] The ultrasonic transducers A12 and C14 are symmetrically mounted on the flowmeter tube wall at the same included angle α (68°), reducing the protrusion depth of each transducer to 2.81 mm, a 47% reduction compared to a 45° angle (5.30 mm), thus lowering flow noise. Eight time measurements are obtained per metering cycle. These eight time measurements, after zero-flow correction, provide accurate transit time, medium sound velocity, and the delay time of each transducer, as well as precise flow rate values ​​in practical applications. Furthermore, by comparing three flow velocity values ​​on the same measurement plane, changes in gas flow regime can be evaluated online.

[0051] In this invention, when ultrasonic transducers A12 and C14 are not working, the associated circuitry and electronic components are controlled by an MCU (Micro Controller Unit) to transmit an electrical signal to ultrasonic transducer B13 and start timing. BD The time delay is converted into a mechanical vibration sound wave signal, which propagates in the gas medium to the end face of the opposite reflecting column E (or the pipe wall of the radial layer), and is reflected back to the end face of the ultrasonic transducer B13, experiencing a time delay of t. BB During the transit time, ultrasonic transducer B13 receives the first echo signal, which takes t seconds. BD The delay time is received and timed by the MCU to obtain the measurement time T. BB1 Some of the ultrasonic signals are reflected again by the end face of the ultrasonic transducer B13 and the opposite reflecting column E (or the curved surface of the radial layer's pipe wall), undergoing another t... BB During the transit time, ultrasonic transducer B13 receives the second echo signal, which takes t seconds. BD The delay time is received and timed by the MCU to obtain the measurement time T. BB2 Two time measurements are obtained after each measurement cycle, and these two measurement times can be decomposed into formulas (1) and (2).

[0052] T BB1 = t BD + t BB + t BD (1)

[0053] T BB2 = t BD + t BB + t BB + t BD (2)

[0054] Wherein: T BB1 The measurement time T is the time it takes for the ultrasonic transducer B13 to receive the signal after the first reflection from the end face of the reflecting column E (or the wall of the radial layer); BB2 The measurement time for ultrasonic transducer B13 to receive the signal after it is emitted by ultrasonic transducer B13, reflected a second time by the end face of reflector E (or the wall of the radial layer), and received by ultrasonic transducer B13; t BB The ultrasonic transducer B13 emits a signal, which is reflected by the end face of the reflector column E (or the wall of the radial layer). The transit time of the ultrasonic signal as it travels through the gas medium twice is t. BD The delay time of ultrasonic transducer B13. It can be derived from formulas (1) and (2):

[0055] t BD = (2T BB1 -T BB2 ) / 2

[0056] Simultaneously, it is deduced that:

[0057] t BB =T BB2 -T BB1

[0058] Because the reflective channel formed by the ultrasonic transducer B13 is perpendicular to the axis of the flowmeter body 1, the flow of gas along the axis has no effect on the propagation of the ultrasonic signal. Its propagation time is only related to the sound velocity C and the channel length L3, so a precise sound velocity value can be obtained.

[0059] C=2L3 / t BB =2L3 / (T BB2 -T BB1 )

[0060] Practical experience shows that the portion of the transducer end face protruding into the internal cavity of the meter body, and the recess formed by the transducer end face and the meter body wall after assembly, will generate turbulent flow that is detrimental to stable metering under high flow rate impact. The larger the transducer diameter, the higher the intensity of the turbulent flow. Currently available domestic gas ultrasonic transducers have large outer diameters, typically exceeding 15mm, far greater than the 10-12mm of mainstream international brands. Selecting domestic ultrasonic transducers for use in ultrasonic flow meters for trade metering requires improved channel design to meet the performance requirements of low flow rate and large range ratio. This invention uses the domestically produced AC6060 chip, with a time resolution better than 300ps and a measurement accuracy better than ±1ns. This invention employs a large-angle V-shaped reflective channel in gas ultrasonic flow meters, with a channel length longer than that of a through-beam channel. Simultaneously, the dimensions of both the protruding and recessed portions are smaller than those of a small-angle through-beam channel, as shown in the attached diagram. Figure 7 As shown. This embodiment compares the propagation of ultrasonic signals in air using a 45° angled through-beam acoustic channel and a 68° angled V-shaped reflection acoustic channel:

[0061]

[0062] As can be seen from the above, the size of the protruding and recessed structures in this utility model is reduced by 47%; the signal propagation time is increased by 52.5%; and although the absolute time difference is reduced by 19%, it meets the requirements of ±1% for small flow ranges.

[0063] like Figure 7 As shown, the ultrasonic transducer has a diameter of 15mm, a 45° included angle, and an extensional protrusion and indentation depth of: cos45°×15 / 2=5.30mm.

[0064] Similarly, with an ultrasonic transducer diameter of 15mm, when the included angle is 68°, the depth of the protrusion and indentation is: cos68°×15 / 2=2.81mm.

[0065] like Figure 8 As shown, the inner diameter of the instrument is 50mm; the length of the 45° angled through-beam acoustic channel is...

[0066] L = 50 / sin45° = 70.71 mm

[0067] For example, the speed of sound in air is 340 m / s, and the gas flow velocity is 0.3 m / s.

[0068] t AC =70.71 / (340+cos45°×0.3)=207.843μs,

[0069] t CA =70.71 / (340- cos45°×0.3)=208.102μs,

[0070] Delt t=259ns.

[0071] 68° angled reflective channel length

[0072] L=(50 / sin68 °)×2=107.85mm,

[0073] For example, the speed of sound in air is 340 m / s, and the gas flow velocity is 0.3 m / s.

[0074] t AC =107.85 / (340+cos68°×0.3)=317.111μs,

[0075] t CA =107.85 / (340- cos68°×0.3)=317.321μs,

[0076] Delt t=210ns.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-channel ultrasonic flow meter, comprising a flow meter body (1), characterized in that, The pipe wall of the flow meter body (1) is provided with: At least one measuring layer, wherein the measuring layer is composed of ultrasonic transducers A (12), ultrasonic transducers B (13) and ultrasonic transducers C (14) forming a V-shaped acoustic channel structure; wherein ultrasonic transducers A (12), ultrasonic transducers B (13) and ultrasonic transducers C (14) are all installed in multiple transducer mounting holes (8) on the flow meter body (1); The ultrasonic transducer A (12) and ultrasonic transducer C (14) are symmetrically installed on opposite sides of the pipe wall of the flow meter body (1) at the same included angle α, and their extended axes intersect on the opposite pipe wall. The ultrasonic transducer B (13) is installed on the pipe wall of the flow meter body (1), and its extended axis is perpendicular to the line connecting the center of the end faces of ultrasonic transducer A (12) and ultrasonic transducer C (14), and intersects at the midpoint of the line. The centerlines of the ultrasonic transducers A (12), B (13) and C (14) are in the same plane.

2. The multi-channel ultrasonic flow meter according to claim 1, characterized in that, The number of the measuring layers is multiple, including at least one radial measuring layer and at least one chordal measuring layer, which are arranged in parallel on the flow meter body (1); In the radial measurement layer, the extended axis of the ultrasonic transducer B (13) passes through the axis of the flow meter body (1); In the chordal measurement layer, a reflector E is provided at the position where the extended axis of the ultrasonic transducer B (13) intersects with the pipe wall.

3. A multi-channel ultrasonic flow meter according to claim 1, characterized in that, The included angle α is 68°; The intersection point of ultrasonic transducers A (12) and C (14) on the opposite side of the pipe wall coincides with the center point of the end face of ultrasonic transducer B (13).

4. A multi-channel ultrasonic flow meter according to claim 1, characterized in that, The front end of the flow meter body (1) is provided with a wire protection cover A (2), and the rear end of the flow meter body (1) is provided with a wire protection cover B (6). The wire protection cover A (2) is fixed to the front end of the flow meter body (1) by bolts and fixing screw holes A (9), and the wire protection cover B (6) is fixed to the rear end of the flow meter body (1) by bolts and fixing screw holes B (17).

5. A multi-channel ultrasonic flow meter according to claim 1, characterized in that, The flow meter body (1) is also provided with a transducer wire collection hole (3), a temperature sensor mounting hole (4) and a pressure tapping hole (5); the flow meter body (1) is provided with a fluid flow direction indicator (11) to indicate the fluid flow direction.

6. A multi-channel ultrasonic flow meter according to claim 1, characterized in that, The flow meter body (1) is also provided with a vertical transducer mounting hole (15) for installing a vertical ultrasonic transducer. The axis of the vertical transducer mounting hole (15) is perpendicular to the axis of the flow meter body (1).

7. A multi-channel ultrasonic flow meter according to claim 6, characterized in that, The ultrasonic transducer B (13) is installed inside the vertical transducer mounting hole (15). The ultrasonic transducer B (13) and the reflector E of the chordal measurement layer or the tube wall of the radial layer form a vertical reflection channel perpendicular to the axis of the surface.

8. A multi-channel ultrasonic flow meter according to claim 7, characterized in that, The vertical reflection channel is used to obtain two reflection times T within one measurement cycle. BB1 and T BB2 .

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