Ultrasonic measuring pipeline and ultrasonic water meter

Abstract

The measuring pipeline comprises a measuring pipeline, a first guiding pipeline and a second guiding pipeline, and the first guiding pipeline and the second guiding pipeline are located on the side face of the measuring pipeline and are communicated with the measuring pipeline through a first penetrating hole and a second penetrating hole respectively. The plane where the first guide pipeline is located is not coplanar with the plane where the measurement pipeline is located, and the plane where the second guide pipeline is located is not coplanar with the plane where the measurement pipeline is located; the transmitting probe is used for transmitting ultrasonic waves; the receiving probe is used for receiving ultrasonic waves; the reflecting pieces comprise the first reflecting piece and the second reflecting piece, and the first reflecting piece is arranged on the first guide pipeline and located below the transmitting probe; according to the utility model, under the condition that the size of the meter body is not increased, the effective transmission distance can be increased, and multiple requirements of flow field quality, meter body size and processing difficulty reduction are considered at the same time.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic measurement technology, and more specifically to an ultrasonic measurement pipeline and an ultrasonic water meter. Background Technology

[0002] Ultrasonic flow measurement offers advantages such as wide measurement range, high accuracy, and maintenance-free operation. The time-of-flight method is a typical ultrasonic flow measurement method. It calculates the average flow velocity by measuring the time it takes for the sound wave to propagate downstream and upstream in the flowing medium, and then multiplies this average velocity by the cross-sectional area of ​​the flow channel to obtain the flow rate. Ultrasonic water meters are instruments that use the time-of-flight method to measure water flow. However, due to the high speed of sound in water (up to 1500 m / s), the time difference corresponding to the minimum operating flow rate is often very small, only on the order of nanoseconds, making accurate measurement difficult. This problem is even more pronounced for small-diameter ultrasonic water meters because their smaller size results in a shorter effective transmission distance, with the minimum time difference potentially falling below 1 ns. Measuring such a short time difference with an accuracy of 2% is even more challenging. Therefore, the design of the acoustic channel in small-diameter water meters often aims to increase the effective transmission distance. A typical small-diameter ultrasonic water meter acoustic channel design is as follows: Figure 1 As shown, there are three main designs: U-shaped, V-shaped, and W-shaped.

[0003] U-shaped transducers are positioned above the flow channel, using two reflectors in the channel to reflect sound waves. The effective transmission distance is equal to the transducer spacing. They are the most compact in size and relatively easy to manufacture. However, they can only test the flow velocity along the channel axis. The reflectors also cause pressure loss and affect the flow field quality and measurement accuracy. V-shaped channels use reflectors on the sides of the channel to reflect ultrasonic waves, which can solve the problems of pressure loss and flow field quality. However, the effective transmission distance is shortened, and the transducers are installed at an angle, resulting in a significant increase in size and inconvenience in installation. At the same time, the difficulty and cost of precision machining the two transducer mounting holes are significantly increased. W-shaped channels use reflectors installed on three side walls to form a W-shaped reflection configuration. Although they can improve the problems of V-shaped channels to some extent, the complexity and manufacturing cost are significantly increased, and their application is less common.

[0004] In summary, the design of ultrasonic water meters should ensure that the measurement channel does not affect the flow field and does not cause additional pressure loss, measures as much flow velocity information as possible to reflect the true flow state, and meets the requirement of small size for easy processing. Utility Model Content

[0005] The summary section of this utility model introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, this utility model proposes an ultrasonic measuring pipeline connected in series with a flow channel to measure the flow velocity of fluid flowing through the flow channel. The ultrasonic measuring pipeline includes: a pipe body connected in series at both ends of the flow channel to form an inlet and an outlet, including a measuring pipe, a first guide pipe and a second guide pipe, the first guide pipe and the second guide pipe being located on the side of the measuring pipe and communicating with the measuring pipe through a first perforation and a second perforation, respectively; the plane of the first guide pipe and the plane of the measuring pipe are not coplanar, and the plane of the second guide pipe and the plane of the measuring pipe are not coplanar; a transmitting probe, disposed in the first guide pipe, for transmitting ultrasonic waves; a receiving probe, disposed in the second guide pipe, for receiving ultrasonic waves; and a reflector, including a first reflector and a second reflector, the first reflector being disposed in the first guide pipe below the transmitting probe; and the second reflector being disposed in the second guide pipe below the receiving probe.

[0007] Preferably, the plane containing the first guide pipe is perpendicular to the plane containing the measuring pipe, and the plane containing the second guide pipe is perpendicular to the plane containing the measuring pipe.

[0008] Preferably, the pipe body further includes an inner liner, which is nested inside the measuring pipe.

[0009] Preferably, the first guide pipe and the second guide pipe are located on the same side of the measuring pipe.

[0010] Preferably, the reflector further includes a third reflector disposed in the measuring pipe.

[0011] Preferably, the reflector further includes a third reflector, a fourth reflector, and a fifth reflector, which are respectively disposed on both sides of the measuring pipe.

[0012] Preferably, the first guide pipe and the second guide pipe are located on both sides of the measuring pipe.

[0013] Preferably, the distance between the center of the first reflector and the center of the transmitting probe is different from the distance between the center of the second reflector and the center of the receiving probe.

[0014] Preferably, the transmitting probe and the receiving probe are cylindrical in shape.

[0015] Preferably, the inner liner tube includes a reduced diameter section between its inlet and outlet to reduce the cross-sectional area of ​​the inner liner tube, and the two ends of the inner liner tube are symmetrical.

[0016] Preferably, the longitudinal section of the reduced diameter portion is a square or a rectangle, and the four corners of the square or rectangle are rounded.

[0017] Preferably, the third reflector is fixed to one side of the reduced diameter section of the inner liner tube.

[0018] Preferably, the third and fifth reflectors are fixed to one side of the reduced diameter section of the inner liner tube, and the fourth reflector is fixed to the other side of the reduced diameter section of the inner liner tube.

[0019] Preferably, a sealing ring is provided between the inner liner tube and the measuring pipe, between the first perforation and the second perforation.

[0020] Preferably, the inner liner tube is provided with a pressure relief hole.

[0021] Preferably, the reflective surface of the first reflector is distributed at an acute angle to the front end face of the transmitting probe, and the reflective surface of the second reflector is distributed at an acute angle to the front end face of the receiving probe.

[0022] Preferably, the transmitting probe is located between the transmitting probe fixing member and the internal protrusion of the first guide pipe, and the transmitting probe fixing member is fixed to the top of the first guide pipe by bolts; the receiving probe is located between the receiving probe fixing member and the internal protrusion of the second guide pipe, and the receiving probe fixing member is fixed to the top of the second guide pipe by bolts.

[0023] Preferably, the first reflector includes a first fixed block and a first movable block, the first fixed block being integrally cast with the first guide pipe, and the first movable block being fixed to the first fixed block by bolts and limiting posts; the second reflector includes a second fixed block and a second movable block, the second fixed block being integrally cast with the second guide pipe, and the second movable block being fixed to the second fixed block by bolts and limiting posts.

[0024] Preferably, the first, second, third, fourth, and fifth reflectors are made of stainless steel and have a mirror-like reflective surface.

[0025] Preferably, the measuring pipe, the first guide pipe, and the second guide pipe are integrally cast.

[0026] Preferably, the inlet or outlet of the pipe is provided with a grille.

[0027] Preferably, the inner liner tube is fixed by a first reflector and a second reflector.

[0028] Preferably, the third, fourth, and fifth reflectors are thermally fused to the inner liner tube.

[0029] An ultrasonic water meter, comprising an ultrasonic measuring pipeline as described in any one of the above claims.

[0030] The beneficial effects of this utility model are as follows: The ultrasonic measuring pipeline and ultrasonic water meter proposed in this utility model can increase the effective transmission distance without increasing the size of the meter body; the transmitting probe and receiving probe are arranged on the side of the measuring channel, which is easy to install and can be adapted to ordinary sensors, greatly reducing the processing cost. At the same time, it can solve the problem of protrusion caused by the sensor being placed in the measuring flow channel area, minimizing the interference to the flow field. Therefore, this three-dimensional V-shaped channel design combines the advantages of conventional U-shaped and V-shaped channel designs, achieving multiple requirements of balancing flow field quality, meter body size and reducing processing difficulty. Attached Figure Description

[0031] The following drawings, which are incorporated herein by reference as part of this invention, are provided for understanding the invention. The drawings illustrate embodiments of the invention and their descriptions, serving to explain the principles of the invention.

[0032] In the attached image:

[0033] Figure 1 This is a schematic diagram of the conventional small-diameter ultrasonic water meter channel design in the background art of this utility model;

[0034] Figure 2 A perspective view and a top view of a three-dimensional V-shaped design for an ultrasonic measuring pipeline provided in Embodiment 1 of this utility model;

[0035] Figure 3 A three-dimensional view of a three-dimensional W-shaped design for an ultrasonic measuring pipeline provided in Embodiment 2 of this utility model;

[0036] Figure 4 A perspective view of an ultrasonic measuring pipeline through-beam acoustic channel design provided in Embodiment 3 of this utility model;

[0037] Figure 5 A perspective view and a left view of an ultrasonic measuring pipeline chord V-shaped design provided in Embodiment 4 of this utility model;

[0038] Figure 6 An exploded view of an ultrasonic water meter provided in Embodiment 5 of this utility model;

[0039] Figure 7 A longitudinal cross-sectional view of an ultrasonic water meter provided in Embodiment 5 of this utility model;

[0040] Figure 8 This is a schematic diagram of a reflector inside a guide pipe.

[0041] In the picture:

[0042] 1. Measuring pipe; 2. First guide pipe; 3. Second guide pipe; 4. Inner liner pipe;

[0043] 4-1. Reduction section; 4-2. Sealing ring; 4-3. Pressure relief hole;

[0044] 5. First perforation; 6. Second perforation; 7. Transmitting transducer; 8. Receiving transducer;

[0045] 9. First reflector; 9-1. Fixed block; 9-2. Movable block; 10. Second reflector; 11. Reflective sheet of third reflector; 12. First transducer fixing component; 13. Second transducer fixing component; 14. PCB board. Detailed Implementation

[0046] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0047] To fully understand this invention, a detailed description will be provided below. Obviously, the implementation of this invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this invention are described in detail below; however, other embodiments may also be possible besides these detailed descriptions.

[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0049] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0050] It should be noted that the terms “up,” “down,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used in this article are for illustrative purposes only and are not intended to be restrictive.

[0051] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0052] Example 1

[0053] Figure 2 The present invention provides a perspective view and a top view of a three-dimensional V-shaped design for an ultrasonic measuring pipeline according to Embodiment 1.

[0054] An ultrasonic measuring conduit, connected in series with a flow channel, is used to measure the flow velocity of fluid flowing through the channel. The ultrasonic measuring conduit includes: a pipe body connected to both ends of the flow channel, forming an inlet and an outlet respectively; a measuring pipe, a first guide pipe, a second guide pipe, and an inner liner; the first and second guide pipes are located on the sides of the measuring pipe and communicate with it through a first and a second perforation, respectively; the plane of the first guide pipe is perpendicular to the plane of the measuring pipe, and the plane of the second guide pipe is also perpendicular to the plane of the measuring pipe; the first and second guide pipes are located on the same side of the measuring pipe. The inner liner is nested inside the measuring pipe; a transmitting transducer is disposed in the first guide pipe for emitting ultrasonic waves; a receiving transducer is disposed in the second guide pipe for receiving ultrasonic waves; and a reflector, including a first reflector, a second reflector, and a third reflector; the first reflector is disposed in the first guide pipe below the transmitting probe; the second reflector is disposed in the second guide pipe below the receiving probe; and the third reflector is disposed in the measuring pipe.

[0055] In this embodiment, both the transmitting and receiving probes are transducers, but other sensors can be selected depending on the actual situation. Figure 2 As shown in (a), the transducer is arranged perpendicular to the measuring plane on one side of the measuring pipe. The ultrasonic waves emitted by the transducer are reflected by the first reflector below the transducer to the measuring pipe, and then reflected by the reflector of the third reflector on the side of the measuring pipe to the second reflector of the second guide pipe. The ultrasonic waves reflected by the second reflector are received by the receiving transducer. By switching the order of the transmitting and receiving transducers through a circuit, the downstream and upstream times are measured, and the real-time flow rate and cumulative flow rate are calculated. Figure 2As shown in (b), this arrangement allows for an effective transmission distance approaching that of a U-shaped reflective channel design without increasing the size of the instrument. Since both transducers are vertically mounted within the flow channel, the machining of their mounting holes is equivalent to that of a U-shaped reflective channel. Furthermore, because the reflector and transducer are located on the side of the measuring pipe, they do not obstruct fluid flow and do not generate additional pressure loss or flow field distortion. Therefore, this three-dimensional V-shaped channel design combines the advantages of conventional U-shaped and V-shaped channel designs, achieving a balance between flow field quality, instrument size, and reduced machining difficulty.

[0056] Example 2

[0057] Figure 3 This is a three-dimensional view of a three-dimensional W-shaped design for an ultrasonic measuring pipeline provided in Embodiment 2 of this utility model.

[0058] An ultrasonic measuring conduit is connected in series with a flow channel to measure the flow velocity of fluid flowing through the channel. The ultrasonic measuring conduit includes: a pipe body connected in series at both ends of the flow channel, forming an inlet and an outlet respectively; a measuring pipe, a first guide pipe, a second guide pipe, and an inner liner; the first and second guide pipes are located on the side of the measuring pipe, on the same side, and are respectively connected to the measuring pipe through a first perforation and a second perforation, which are commonly referred to in the industry as acoustic windows; the plane of the first guide pipe is perpendicular to the plane of the measuring pipe, and the plane of the second guide pipe is perpendicular to the plane of the measuring pipe. The planes are perpendicular to each other, and the inner liner is nested inside the measuring pipe. A transmitting probe, positioned in the first guide pipe, is used to emit ultrasonic waves. A receiving probe, positioned in the second guide pipe, is used to receive ultrasonic waves. Reflectors, including a first reflector, a second reflector, a third reflector, a fourth reflector, and a fifth reflector, are present. The first reflector is positioned in the first guide pipe below the transmitting probe; the second reflector is positioned in the second guide pipe below the receiving probe. The third and fifth reflectors are fixed to one side of the reduced diameter section of the inner liner, and the fourth reflector is fixed to the other side of the reduced diameter section. The third, fourth, and fifth reflectors form a W-shaped reflection of the sound waves. The inner liner is fixed and limited by the first and second reflectors.

[0059] As shown in the figure, a stereo W-shaped channel can further increase the effective transmission distance, but requires two additional reflections.

[0060] Example 3

[0061] Figure 4 This is a perspective view of an ultrasonic measuring pipeline through-beam acoustic channel design provided in Embodiment 3 of this utility model.

[0062] An ultrasonic measuring conduit is connected in series with a flow channel to measure the flow velocity of fluid flowing through the channel. The ultrasonic measuring conduit includes: a pipe body connected in series at both ends of the flow channel to form an inlet and an outlet, including a measuring pipe, a first guide pipe, a second guide pipe, and an inner liner. The first and second guide pipes are located on both sides of the measuring pipe and are arranged in a counter-facing manner. They communicate with the measuring pipe through a first perforation and a second perforation, respectively. The plane of the first guide pipe is perpendicular to the plane of the measuring pipe, and the plane of the second guide pipe is perpendicular to the plane of the measuring pipe. The inner liner is nested inside the measuring pipe; a transmitting probe is disposed in the first guide pipe for transmitting ultrasonic waves; a receiving probe is disposed in the second guide pipe for receiving ultrasonic waves; and a reflector including a first reflector and a second reflector. The first reflector is disposed in the first guide pipe below the transmitting probe, and the second reflector is disposed in the second guide pipe below the receiving probe.

[0063] In this embodiment, both the transmitting and receiving probes are transducers, and the transducers of the stereo through-beam channel are arranged on both sides of the channel. Compared with stereo V-shaped reflection, the stereo through-beam channel can reduce one reflection, but the transducers are arranged on both sides of the channel, which increases the size of the surface.

[0064] Example 4

[0065] Figure 5 This is a perspective view and a left view of a V-shaped chord design for an ultrasonic measuring pipeline according to Embodiment 4 of this utility model. The difference between this embodiment and Embodiment 1 is that the distance between the center of the first reflector and the center of the transmitting probe is different, and the distance between the center of the second reflector and the center of the receiving probe is different. The parts that are the same as in Embodiment 1 will not be described again in this embodiment.

[0066] In this scheme, the positions of the transducer and the third reflector on the side of the measuring pipe remain unchanged. The first or second reflector is moved upwards, and the second or first reflector is moved downwards. Simultaneously, the normals of the first and second reflectors are rotated so that the reflected rays still converge at the center of the reflector inside the measuring pipe. At this point, the measuring channels are located along the two intersecting chords of the pipe profile. Compared to a centerline channel arrangement, this allows for the measurement of more cross-sectional flow velocity information, contributing to improved measurement accuracy and stability.

[0067] Similarly, the stereo W-shaped sound channel and stereo through-beam sound channel in Embodiments 2 and 3 can also achieve the function of measuring more profile flow velocity information by moving one reflector upward and the other reflector downward, thereby improving the measurement accuracy and stability.

[0068] Example 5

[0069] Figure 6This is an exploded view of an ultrasonic water meter provided in Embodiment 5 of this utility model. Figure 7 This is a longitudinal cross-sectional view of an ultrasonic water meter provided in Embodiment 5 of this utility model. This embodiment uses the three-dimensional V-shaped measuring pipe described in Embodiment 1. The measuring pipes described in Embodiments 2 to 4 are also applicable to the ultrasonic water meter described in this embodiment.

[0070] An ultrasonic measuring pipeline is connected in series with a flow channel to measure the flow velocity of fluid flowing through the flow channel. The ultrasonic measuring pipeline includes: a pipe body connected in series at both ends of the flow channel to form an inlet and an outlet, including a measuring pipe 1, a first guide pipe 2, a second guide pipe 3, and an inner liner pipe 4. The first guide pipe 2 and the second guide pipe 3 are located on the same side of the measuring pipe 1 and are connected to the measuring pipe 1 through a first perforation 5 and a second perforation 6, respectively. The plane of the ultrasonic emission path in the first guide pipe 2 is perpendicular to the plane of the ultrasonic measurement path in the measuring pipe 1. In the first guide pipe 2, the transmitting transducer 7 is cylindrical with the working surface being the front end face, which emits ultrasonic waves vertically downward. The first reflector 9 is inclined and reflects the ultrasonic waves through the first perforation 5 to the reflector sheet 11 of the third reflector, and then through the second perforation 6 to reach the second reflector 10. The second reflector 10 is inclined and reflects the ultrasonic waves to the receiving transducer 8. By switching the order of the transmitting and receiving transducers via circuitry, the flight time in the downstream and upstream directions can be measured. Similarly, the plane containing the second guide pipe 3 is perpendicular to the plane containing the measuring pipe. The inner liner 4 is nested inside the measuring pipe 1, symmetrical at both ends. Between its inlet and outlet is a narrowing section 4-1, which reduces the cross-sectional area of ​​the inner liner 4, improving measurement accuracy. The longitudinal section of the narrowing section 4-1 is square or rectangular, with rounded corners. This shape facilitates the fixing of the reflector 11 and reduces pressure loss. The inner liner is an injection-molded part, and the reflector 11 of the third reflector is fixed to the side of the narrowing section of the inner liner by heat fusion. Guide vanes and gradient structures are provided at the inlet and outlet of the inner liner to achieve a transition from the inlet to the narrowing section and then to the outlet. A sealing ring 4-2 is provided on the inner liner to prevent fluid from passing through the gap between the inner liner and the measuring pipe 1. A pressure relief hole 4-3 is also provided on the inner liner to prevent excessive water pressure from damaging the inner liner and the reflector 11 of the third reflector.

[0071] The transducer 7 is located between the first transducer fixing member 12 and the inner protrusion of the first guide pipe 2. The top of the first transducer fixing member 12 and the first guide pipe 2 are fixed by bolts, and the bottom of the transducer 7 is limited by the inner protrusion of the first guide pipe 2. The transducer 8 is located between the second transducer fixing member 13 and the inner protrusion of the second guide pipe 3. The top of the second transducer fixing member 13 and the second guide pipe 3 are fixed by bolts.

[0072] Figure 8 This is a schematic diagram of the reflector inside the guide pipe. The first and second reflectors have the same internal structure; only the internal structure of one reflector is described here. The reflector includes a fixed block 9-1 and a movable block 9-2. The fixed block 9-1 is integrally cast with the guide pipe. The movable block 9-2 is fixed to the fixed block 9-1 by bolts and limiting posts. The fixed block 9-1 has grooves or protrusions, and the corresponding movable block 9-2 has protrusions or grooves. The movable block 9-2 is made of stainless steel, and its reflective surface is mirror-like. The movable block 9-2 is tilted to reflect the ultrasonic waves emitted by the transducer through the movable block 9-2, and then through the first perforation 5 to the reflector sheet 11 of the third reflector, thus providing guidance. The reflector can be made of stainless steel with a mirror-like reflective surface, or it can be made of other materials that achieve a mirror-like reflection effect.

[0073] In this embodiment, the measuring pipe 1, the first guide pipe 2, and the second guide pipe 3 are integrally cast, simplifying the production process. A grid is provided at the inlet or outlet of the pipe body to rectify the flow. The inner liner pipe 4 is fixed by the first reflector 9 and the second reflector 10. During installation, the inner liner pipe 4 is installed first, and then the movable blocks of the first reflector 9 and the second reflector 10 are fixed from the first guide pipe 2 and the second guide pipe 3 to their corresponding fixed blocks.

[0074] In this embodiment, a PCB board 14 is also included. The PCB board 14 can be installed on the side of the transducer or on top of the transducer, depending on the requirements of the water meter.

[0075] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An ultrasonic measuring conduit, connected in series with a flow channel to measure the flow velocity of fluid flowing through the flow channel, characterized in that, The ultrasonic measurement pipeline includes: The pipe body, connected in series at both ends of the flow channel to form an inlet and an outlet, includes a measuring pipe, a first guide pipe and a second guide pipe. The first guide pipe and the second guide pipe are located on the side of the measuring pipe and are connected to the measuring pipe through a first through hole and a second through hole, respectively. The plane where the first guide pipe is located is not coplanar with the plane where the measuring pipe is located, and the plane where the second guide pipe is located is not coplanar with the plane where the measuring pipe is located. A transmitting probe, positioned in the first guide channel, is used to transmit ultrasonic waves; A receiving probe, configured in the second guide channel, is used to receive ultrasonic waves; The reflector includes a first reflector and a second reflector, wherein the first reflector is disposed in a first guide channel and located below the transmitting probe; and the second reflector is disposed in a second guide channel and located below the receiving probe.

2. The ultrasonic measuring pipeline according to claim 1, characterized in that, The plane containing the first guide pipe is perpendicular to the plane containing the measuring pipe, and the plane containing the second guide pipe is perpendicular to the plane containing the measuring pipe.

3. The ultrasonic measuring pipeline according to claim 1, characterized in that, The pipe body also includes an inner liner, which is nested inside the measuring pipe.

4. The ultrasonic measuring pipeline according to claim 1, characterized in that, The first guide pipe and the second guide pipe are located on the same side of the measuring pipe.

5. An ultrasonic measuring pipeline according to claim 4, characterized in that, The reflector also includes a third reflector disposed in the measuring pipe.

6. The ultrasonic measuring pipeline according to claim 4, characterized in that, The reflector also includes a third reflector, a fourth reflector, and a fifth reflector, which are respectively disposed on both sides of the measuring pipe.

7. The ultrasonic measuring pipeline according to claim 1, characterized in that, The first guide pipe and the second guide pipe are located on both sides of the measuring pipe.

8. An ultrasonic measuring pipeline according to claim 4 or 7, characterized in that, The distance between the center of the first reflector and the center of the transmitting probe is different from the distance between the center of the second reflector and the center of the receiving probe.

9. An ultrasonic measuring pipeline according to claim 1, characterized in that, The transmitting probe and the receiving probe are cylindrical in shape.

10. An ultrasonic measuring pipeline according to claim 3, characterized in that, The inner liner tube includes a reduced diameter section between its inlet and outlet, which reduces the cross-sectional area of ​​the inner liner tube. The two ends of the inner liner tube are symmetrical.

11. An ultrasonic measuring pipeline according to claim 10, characterized in that, The longitudinal section of the reduced diameter portion is a square or a rectangle, and the four corners of the square or rectangle are rounded.

12. An ultrasonic measuring pipeline according to claim 5 or 11, characterized in that, The third reflector is fixed to one side of the reduced diameter section of the inner liner tube.

13. An ultrasonic measuring pipeline according to claim 6 or 11, characterized in that, The third and fifth reflectors are fixed to one side of the reduced diameter section of the inner liner tube, and the fourth reflector is fixed to the other side of the reduced diameter section of the inner liner tube.

14. An ultrasonic measuring pipeline according to claim 3, characterized in that, A sealing ring is provided between the inner liner and the measuring pipe, between the first and second perforations.

15. An ultrasonic measuring pipeline according to claim 3, characterized in that, The inner liner tube is provided with a pressure relief hole.

16. An ultrasonic measuring pipeline according to claim 1, characterized in that, The reflective surface of the first reflector is distributed at an acute angle to the front end face of the transmitting probe, and the reflective surface of the second reflector is distributed at an acute angle to the front end face of the receiving probe.

17. An ultrasonic measuring pipeline according to claim 1, characterized in that, The transmitting probe is located between the transmitting probe fixing component and the internal protrusion of the first guide pipe, and the transmitting probe fixing component is fixed to the top of the first guide pipe by bolts; the receiving probe is located between the receiving probe fixing component and the internal protrusion of the second guide pipe, and the receiving probe fixing component is fixed to the top of the second guide pipe by bolts.

18. An ultrasonic measuring pipeline according to claim 1, characterized in that, The first reflector includes a first fixed block and a first movable block. The first fixed block is integrally cast with the first guide pipe, and the first movable block and the first fixed block are fixed together by bolts and limiting posts. The second reflector includes a second fixed block and a second movable block. The second fixed block is integrally cast with the second guide pipe, and the second movable block and the second fixed block are fixed together by bolts and limiting posts.

19. An ultrasonic measuring pipeline according to claim 1, 5, or 6, characterized in that, The first, second, third, fourth, and fifth reflectors are made of stainless steel and have a mirror-like reflective surface.

20. An ultrasonic measuring pipeline according to claim 1, characterized in that, The measuring pipe, the first guide pipe, and the second guide pipe are cast as a single unit.

21. An ultrasonic measuring pipeline according to claim 1, characterized in that, The inlet or outlet of the pipe is equipped with a grating.

22. An ultrasonic measuring pipeline according to claim 3, characterized in that, The inner liner tube is fixed by a first reflector and a second reflector.

23. An ultrasonic measuring pipeline according to claim 13, characterized in that, The third, fourth, and fifth reflectors are fixed to the inner liner tube by heat fusion.

24. An ultrasonic water meter, characterized in that, Includes an ultrasonic measuring pipeline as described in any one of claims 1 to 23.

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