Measuring tube and ultrasonic water meter

Abstract

The invention relates to the technical field of ultrasonic water meters, in particular to a measuring tube and an ultrasonic water meter, and aims to solve the problems that a measuring tube of an existing ultrasonic water meter is large in assembly difficulty and high in production cost. In order to achieve the purpose, the measuring tube comprises a middle tube section provided with a first positioning part; the outer pipe body comprises a first sub-pipe and a second sub-pipe, a first groove is formed in the first sub-pipe, a second groove is formed in the second sub-pipe, the first sub-pipe and the second sub-pipe are buckled to form the outer pipe body and surround the outer side of the middle pipe section, the first groove and the second groove jointly form a first positioning groove, and the first positioning part is matched with the first positioning groove; the rectifiers are arranged on the two sides of the middle pipe section and the outer pipe body respectively; the reflector plate bracket is arranged in the outer tube body, is positioned between the rectifier and the middle tube section, and is connected with the rectifier; and the locking structure is used for fixing the first sub-pipe and the second sub-pipe. The assembly difficulty and the production cost can be reduced.

Description

Technical Field

[0001] This application relates to the field of ultrasonic water meter technology, specifically providing a measuring tube and an ultrasonic water meter. Background Technology

[0002] An ultrasonic water meter is a smart water meter that uses the time difference (or frequency difference, phase difference) of ultrasonic waves propagating in a flowing liquid to measure the flow velocity and then calculate the flow rate. It is currently widely used in the field of fluid flow measurement.

[0003] Currently, measuring tubes are generally assembled using integrated packaging or welding to ensure their stability during long-term use. However, these methods usually require auxiliary assembly equipment or positioning fixtures, which not only increases production costs but also makes the assembly accuracy of the measuring tube highly susceptible to human factors, thus posing a significant assembly challenge.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] This application aims to solve the aforementioned technical problems, namely, to address the difficulties in assembling the measuring tube and the high production costs of existing ultrasonic water meters.

[0006] In a first aspect, this application provides a measuring tube comprising:

[0007] The intermediate pipe section has a first positioning part on its outer surface;

[0008] The outer tube body includes a first sub-tube and a second sub-tube that are independent of each other. The first sub-tube has a first groove, and the second sub-tube has a second groove that is opposite to the first groove. The first sub-tube and the second sub-tube are fastened together to form the outer tube body and surround the outside of the intermediate tube section. The first groove and the second groove together form a first positioning groove. The first positioning part is adapted to the first positioning groove to restrict the relative movement between the intermediate tube section and the outer tube body.

[0009] Rectifiers are respectively disposed on both sides of the intermediate pipe section and the outer pipe body;

[0010] A reflector support is disposed within the outer tube and located between the rectifier and the intermediate tube section; the reflector support is connected to the rectifier.

[0011] A locking structure is used to secure the first sub-tube and the second sub-tube.

[0012] In one technical solution of the above-mentioned measuring tube, the rectifier includes a first part and a second part that are independent of each other, the first part is connected to the first sub-tube, and the second part is connected to the second sub-tube;

[0013] The reflector support includes a first sub-support and a second sub-support that are independent of each other. The first sub-support is connected to the first part, and the second sub-support is connected to the second part.

[0014] In one technical solution of the above-mentioned measuring tube, the locking structure includes a hook disposed on the first sub-support and a snap-fit ​​portion disposed on the second sub-support. The snap-fit ​​portion includes a working surface that cooperates with the hook. When the hook is snapped and fixed with the working surface, the first sub-support and the second sub-support are fastened together to form the reflector support.

[0015] In one technical solution of the above-mentioned measuring tube, the intermediate tube section includes a reduced diameter section and flared sections respectively disposed at both ends of the reduced diameter section, and the diameter of the flared sections gradually increases along the direction away from the reduced diameter section.

[0016] In one technical solution of the above-mentioned measuring tube, multiple support rods are arranged circumferentially at intervals at the end of the outer tube near the rectifier, and a hollow area is formed between adjacent support rods, and the rectifier is connected to the support rods;

[0017] The flared portion extends into the hollowed-out area, and the flared portion is provided with a plurality of second positioning grooves that are adapted to the support rod at intervals along the circumferential direction, and the support rod is embedded in the second positioning groove.

[0018] In one technical solution of the above-mentioned measuring tube, both the first groove and the second groove are close to the hollow area, so that the first positioning groove is in communication with the hollow area;

[0019] The first positioning part is disposed at the connection between the flared part and the reduced diameter part, and the first positioning part is at least partially located in the first positioning groove.

[0020] In one technical solution of the above-mentioned measuring tube, a sealing groove is provided circumferentially on the outer surface of the outer tube near the end of the hollow area, and a sealing ring is set in the sealing groove.

[0021] In one technical solution of the above-mentioned measuring tube, the inner wall of the intermediate tube section is provided with a plurality of guide vanes along the circumferential direction, and each of the guide vanes extends along the axial direction of the intermediate tube section.

[0022] The end of the guide vane extends to the flared portion, and the end of the guide vane is provided with a guide arc surface.

[0023] In one technical solution of the aforementioned measuring tube, the rectifier is integrally formed with the outer tube body; and / or

[0024] The rectifier and the reflector support are integrally formed.

[0025] In a second aspect, this application provides an ultrasonic water meter comprising the measuring tube described in any one of the first aspects.

[0026] By adopting the above technical solution, this application sets the various components of the measuring tube as separate structures, and achieves relative fixation between the intermediate tube section and the outer tube body through the cooperation of the first positioning part on the intermediate tube section and the first positioning groove on the outer tube body. After initial positioning, the various separate structures are fixedly connected into one unit by a locking structure. In this way, compared with the integrated packaging or welding assembly method of the measuring tube in the prior art, the assembly of the measuring tube in this application does not require other auxiliary assembly equipment or positioning tooling, which can reduce the assembly difficulty and production cost. Attached Figure Description

[0027] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0028] Figure 1 This is a schematic diagram of the overall structure of a measuring tube according to an embodiment of this application;

[0029] Figure 2 yes Figure 1 A sectional view;

[0030] Figure 3 yes Figure 1 The front view;

[0031] Figure 4 This is a three-dimensional exploded view of a measuring tube according to an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of a reflector holder according to an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of a first sub-support according to an embodiment of this application;

[0034] Figure 7 This is a schematic diagram of a second sub-support according to an embodiment of this application.

[0035] In the figure, the reference numerals refer to the following:

[0036] 1. Intermediate pipe section; 100. Symmetrical plane; 11. Reducing diameter section; 12. Flared section; 121. Second positioning groove; 13. Guide vane; 14. First positioning part; 2. Outer pipe body; 201. First sub-pipe; 2011. First groove; 202. Second sub-pipe; 2021. Second groove; 21. First positioning groove; 22. Support rod; 23. Sealing groove; 3. Rectifier; 301. First part; 302. Second part; 31. Spoke wheel; 32. Spoke; 33. Reinforcing rib; 4. Reflector bracket; 401. First sub-bracket; 4011. Hook; 402. Second sub-bracket; 4021. Snap-fit ​​part; 4022. Working surface; 403. Limiting protrusion; 404. Limiting groove; 41. Slot. Detailed Implementation

[0037] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0038] It should be noted that in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These terms are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In the field of ultrasonic flow metering, especially in the application of ultrasonic water meters, flow control and pressure loss are key factors affecting metering accuracy and energy efficiency (pressure loss directly translates into additional energy consumption of the water pump). The flow patterns within the measuring tube of an ultrasonic water meter are typically complex, with numerous swirling and turbulent flows. Therefore, when there is disturbance in the pipeline or the installation environment is confined, the relationship between the flow velocity along the "sound path" through which the ultrasonic beam passes and the average flow velocity of the pipe cross-section becomes unstable, introducing measurement errors and making accurate measurement difficult. Furthermore, pressure loss also adds to energy consumption.

[0041] To ensure fluid flow and improve measurement accuracy, some related technologies typically employ a grid-type rectifier at the front end of the reflector in the measuring tube. This rectifier cuts and organizes the fluid passing through the measuring tube, enhancing its anti-interference capability. However, both the rectifier and the reflector increase pressure loss as the fluid flows through the measuring tube, leading to increased energy consumption in the pipeline network. To control pressure loss, the inner core size of the measuring tube needs to be increased. However, increasing the inner core size to reduce pressure loss directly results in a lower fluid velocity for the same volumetric flow rate. At extremely low flow velocities, ultrasonic water meters exhibit weaker time-difference signals and a worse signal-to-noise ratio, thus reducing measurement accuracy. Therefore, neither of these methods can meet the dual requirements of high-precision metering and energy saving, and both still have significant drawbacks.

[0042] Reference Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the overall structure of the measuring tube according to an embodiment of this application. Figure 2 for Figure 1 sectional view, Figure 3 for Figure 1 The front view of the measuring tube. The measuring tube includes an intermediate tube section 1, an outer tube body 2, a rectifier 3, and a reflector support 4. The outer tube body 2 surrounds the outside of the intermediate tube section 1, and the outer tube body 2 and the intermediate tube section 1 are relatively fixed. The rectifier 3 is disposed on both sides of the intermediate tube section 1 along the axial direction, and the reflector support 4 is located between the rectifier 3 and the intermediate tube section 1. In one embodiment of this application, a rectifier 3 and a reflector support 4 are respectively disposed on each side of the intermediate tube section 1, that is, each end of the measuring tube is provided with a rectifier 3 and a reflector support 4. The rectifier 3 and the reflector support 4 will be described below using one end of the measuring tube as an example.

[0043] The rectifier 3 includes a spoke wheel 31 and a plurality of spokes 32 arranged circumferentially along the inner wall of the spoke wheel 31. A channel for fluid passage is formed between any two adjacent spokes 32. As the fluid passes through the rectifier 3, the spokes 32 cut and organize the fluid, transforming the originally swirling or turbulent fluid into a near-laminar flow flowing along the axial direction of the measuring tube. In one embodiment, the spokes 32 extend radially along the spoke wheel 31. Thus, the channel formed between two adjacent spokes 32 extends axially along the measuring tube, enabling the rectified fluid to tend to flow axially along the measuring tube, maximizing the improvement of the fluid's flow pattern and thus enhancing measurement accuracy.

[0044] The reflector bracket 4 is located between the rectifier 3 and the intermediate pipe section 1. More precisely, one end of the reflector bracket 4 is connected to the rectifier 3, and the other end is located in the area between the rectifier 3 and the intermediate pipe section 1. For ease of description, the end of the reflector bracket 4 near the intermediate pipe section 1 is called the first end, and the end of the reflector bracket 4 near the rectifier 3 is called the second end. It can be seen that the first end and the second end are opposite to each other, and the first end is located in the area between the intermediate pipe section 1 and the rectifier 3. The first end is used to install the reflector. The second end extends toward the rectifier 3 and is fixedly connected to each spoke 32. Thus, one side of the spoke 32 is connected to the inner wall of the spoke wheel 31, and the other side is connected to the outer surface of the reflector bracket 4. The second end of the reflector bracket 4 is "embedded" into the rectifier 3 and at least partially overlaps with the rectifier 3 in the axial direction of the measuring tube.

[0045] The cross-sectional area of ​​the reflector bracket 4 gradually decreases from the first end to the second end. For example, the shape of the reflector bracket 4 can be conical, semi-circular, or semi-ellipsoidal. When the reflector bracket 4 adopts the above-mentioned cross-sectional gradual structure, its outer surface is smooth and continuous, which guides the flow of fluid and reduces the impact resistance of the reflector bracket 4 on the fluid, thereby reducing pressure loss and reducing eddy currents.

[0046] By adopting the above technical solution, this application integrates the reflector bracket 4 with the spokes 32 of the rectifier 3, eliminating the need for additional structural fixation of the reflector bracket 4. This minimizes the obstruction of the fluid caused by the volume of the reflector bracket 4, thereby reducing the impact resistance on the fluid. Furthermore, the outer surface of the reflector bracket 4 is circumferentially connected to each spoke 32. Under the action of fluid impact force, the stress on each part of the reflector bracket 4 tends to be consistent, thereby improving the structural strength between the rectifier 3 and the reflector bracket 4 and enhancing the overall stability of the measuring tube.

[0047] More importantly, by embedding the reflector support 4 into the rectifier 3, the reflector support 4 and the rectifier 3 overlap in the axial space. As the fluid passes through the rectifier 3, it is cut and combed, eliminating turbulence, eddies, or swirls, resulting in a more uniform fluid velocity distribution. During this process, the fluid also flows along the surface of the reflector support 4, which guides the flow and ensures that the fluid flow pattern is not disrupted as much as possible. In this way, compared with the existing method, it can effectively improve the phenomenon of eddies generated by the fluid being blocked by the reflector support again after rectification. This not only reduces pressure loss but also improves measurement accuracy. There is no need to control pressure loss by increasing the size of the measuring tube, which can meet the dual requirements of high-precision measurement and energy saving.

[0048] On the other hand, since the reflector bracket 4 and the rectifier 3 overlap in the axial space, the axial dimension of the measuring tube can be reduced, making the structure more compact and reducing the space occupied by the measuring tube.

[0049] In some embodiments, the reflector bracket 4 and the rectifier 3 of this application can be integrally molded. In this way, not only is the connection strength between the two guaranteed, but also after the measuring tube is assembled, the position of the reflector bracket 4 relative to the intermediate pipe section 1, the rectifier 3, and functional components such as the transducer on the ultrasonic water meter is always fixed, thereby effectively improving the problem of decreased metering accuracy caused by the positioning accuracy of the reflector bracket 4.

[0050] In one implementation of this application, a reinforcing rib 33 is further connected between the rectifier 3 and the reflector support 4. The reinforcing rib 33 is fixedly connected to the outer surfaces of the spokes 32 and the reflector support 4, respectively. Optionally, the reinforcing rib 33 and the spokes 32 are in the same plane, and the reinforcing rib 33 can be integrally formed with the spokes 32. In this case, the reinforcing rib 33 can be understood as an extension of the spokes 32 towards the side where the middle pipe section 1 is located. The shape of the reinforcing rib 33 can be triangular. Thus, the reinforcing rib 33 is located between the rectifier 3 and the reflector support 4, and acts as a "reinforcing rib", which can further enhance the overall structural strength of the integral structure formed by the rectifier 3 and the reflector support 4. At the same time, the reinforcing rib 33 can also further play a rectification role.

[0051] It should be understood that, depending on actual needs, the number of reinforcing ribs 33 can be consistent with the number of spokes 32 and correspond one-to-one. Of course, reinforcing ribs 33 can also be set on some spokes 32 according to spatial layout requirements. This application does not limit this.

[0052] In some embodiments of this application, the central axis of the reflector support 4, the central axis of the spoke wheel 31, and the central axis of the intermediate tube section 1 coincide with each other. This results in a symmetrical flow field distribution within the measuring tube, thereby further improving the uniformity of fluid velocity distribution in different parts of the measuring tube and enhancing measurement accuracy.

[0053] In some implementations, the second end of the reflector bracket 4 protrudes from the end face of the rectifier 3 away from the intermediate pipe section 1. This increases the axial length of the reflector bracket 4, making its outer surface smoother, thereby improving the flow guiding effect and reducing the impact resistance on the fluid. Furthermore, it maximizes the contact area between the fins 32 and the outer surface of the reflector bracket 4, thus improving the connection stability between the rectifier 3 and the reflector bracket 4 and enhancing structural strength.

[0054] Reference Figure 1 , Figure 2 and Figure 3In one implementation of this application, the intermediate pipe section 1 includes a reduced diameter section 11 and flared sections 12 respectively disposed at both ends of the reduced diameter section 11. The diameter of the flared section 12 gradually increases along the direction away from the reduced diameter section 11, and is in the shape of a "trumpet".

[0055] After the fluid flows along the outer surface of the reflector support 4 from its second end to its first end, it detaches from the reflector support 4. Since the inner diameter of the reduced diameter section 11 is small (smaller than the inner diameter of the outer tube 2), if the fluid directly enters the reduced diameter section 11, eddies may be generated in the narrow space between the reflector support 4 and the inlet end of the reduced diameter section 11. This would not only increase pressure loss but also affect the uniformity of the flow velocity distribution. Therefore, this application adds a flared section 12 to the end of the reduced diameter section 11, allowing the fluid to enter the reduced diameter section 11 under the guiding effect of the inner surface of the flared section 12. This effectively reduces fluid disturbance caused by sudden changes in pipe diameter, reduces pressure loss, improves the uniformity of the flow velocity distribution, and thus improves metering accuracy.

[0056] Optionally, the inner wall of the intermediate pipe section 1 is further provided with a plurality of guide vanes 13 along the circumferential direction, the spacing between adjacent guide vanes 13 is equal, and each guide vane 13 extends along the axial direction of the intermediate pipe section 1. In this way, the guide vanes 13 can further cut and comb the fluid entering the narrowed section 11, and improve the uniformity of the flow velocity distribution at various positions in the narrowed section 11.

[0057] In order to eliminate the disturbance to the fluid caused by the obstruction at the end of the guide vane 13, both ends of the guide vane 13 extend to the flared portion 12 on the corresponding side, and the guide vane 13 is provided with a guide arc surface at its end. The extension trajectory of the guide arc surface can be basically the same as the extension trajectory of the flared portion 12. The purpose is also to eliminate the fluid disturbance caused by the abrupt change in cross-section.

[0058] Reference Figure 4 The image shown is a three-dimensional exploded view of a measuring tube according to an embodiment of this application. Among the various components of the measuring tube, the outer tube body 2 includes a first sub-tube 201 and a second sub-tube 202 that are independent of each other. The first sub-tube 201 and the second sub-tube 202 have the same structural dimensions; that is, both the first sub-tube 201 and the second sub-tube 202 are "half-tubes." The first sub-tube 201 and the second sub-tube 202 are fastened together to form the outer tube body 2. The rectifier 3 includes a first portion 301 and a second portion 302 that are independent of each other. Similarly, the first portion 301 and the second portion 302 are fastened together to form the rectifier 3, wherein the first portion 301 is connected to the first sub-tube 201, and the second portion 302 is connected to the second sub-tube 202. The reflector support 4 includes a first sub-support 401 and a second sub-support 402 that are independent of each other. The first sub-support 401 is connected to the first portion 301, and the second sub-support 402 is connected to the second portion 302.

[0059] As shown above, among the various components of the measuring tube, only the middle tube section 1 is an integral structure, while the outer tube body 2, rectifier 3, and reflector bracket 4 are all separate structures. More specifically, the first sub-tube 201, the first part 301, and the first sub-bracket 401 are connected as an integral structure, and the second sub-tube 202, the second part 302, and the second sub-bracket 402 are connected as an integral structure. Thus, when the two are fastened together, they surround the middle tube section 1.

[0060] Combination Figure 1 and Figure 4 A first positioning part 14 is fixedly provided on the outer surface of the intermediate tube section 1. A first groove 2011 is provided on the first sub-tube 201, and a second groove 2021 is provided on the second sub-tube 202. The first groove 2011 and the second groove 2021 correspond to each other. When the first sub-tube 201 and the second sub-tube 202 are engaged, the first groove 2011 and the second groove 2021 together form a first positioning groove 21 that is adapted to the first positioning part 14. In this way, when assembling the measuring tube, the relative positional relationship between the first sub-tube 201 and the second sub-tube 202 can be adjusted so that the first groove 2011 and the second groove 2021 are opposite to each other and engaged to the outside of the first positioning part 14. This not only enables rapid positioning, but also restricts the relative movement between the intermediate tube section 1 and the outer tube body 2 by the cooperation of the first positioning part 14 and the first positioning groove 21.

[0061] The first positioning part 14 can be a square block, a cylinder, or a cube with a rhomboid or regular polygonal cross-section. This application does not limit it. It is understood that the shapes of the first groove 2011 and the second groove 2021 need to be adapted to the first positioning part 14. For example, when the first positioning part 14 is a square block, the cross-sections of the first groove 2011 and the second groove 2021 are both rectangular. When the first positioning part 14 is a cylinder, the cross-sections of the first groove 2011 and the second groove 2021 are both semi-circular.

[0062] Multiple support rods 22 are spaced circumferentially at the end of the outer tube 2 near the rectifier 3, forming a hollow area between adjacent support rods 22. Alternatively, the outer tube 2 can be understood as having multiple hollow areas formed by circumferential hollowing out at the end near the rectifier 3, with the support rods 22 serving as the connecting parts between adjacent hollow areas. The reflector bracket 4 is located within the hollow area. The spokes 31 of the rectifier 3 are fixedly connected to each support rod 22. In actual production, the rectifier 3 and the support rods 22 can be integrally formed, i.e., the first part 301 is integrally formed with the first sub-tube 201, and the second part 302 is integrally formed with the second sub-tube 202.

[0063] The flared part 12 extends into the hollow area. The edge of the flared part 12 away from the reduced diameter part 11 is provided with a plurality of second positioning grooves 121 at intervals along the circumference. The number of second positioning grooves 121 is the same as the number of support rods 22 and they correspond one to one. When the first sub-tube 201 and the second sub-tube 202 are engaged and positioned by the first positioning part 14 and the first positioning groove 21, each support rod 22 is respectively embedded in the corresponding second positioning groove 121.

[0064] Thus, by forming a spaced-out hollow area at the end of the outer tube 2 near the rectifier 3, each support rod 22 and each second positioning groove 121 are engaged with each other, which plays a further positioning role between the intermediate tube section 1 and the outer tube 2, and restricts the relative rotation between the outer tube 2 and the intermediate tube section 1.

[0065] On the other hand, the hollowed-out area can also reduce the overall weight of the measuring tube, meeting the requirements of lightweight design, and at the same time reducing material costs.

[0066] Optionally, in one implementation, both the first groove 2011 and the second groove 2021 are close to the hollow area, so that after the first sub-tube 201 and the second sub-tube 202 are engaged, the first positioning groove 21 communicates with one of the hollow areas. Correspondingly, the first positioning part 14 is fixedly disposed at the connection between the flared part 12 and the reduced diameter part 11, and the first positioning part 14 is at least partially located in the first positioning groove 21.

[0067] When the above method is adopted, the first positioning groove 21 is connected to the hollow area, and the first positioning part 14 is connected between the flared part 12 and the reduced diameter part 11. In this way, the first positioning part 14 acts as a "reinforcing rib" between the flared part 12 and the reduced diameter part 11, which can improve the overall structural strength of the intermediate pipe section 1.

[0068] As described above, the cooperation between the first positioning groove 21 and the first positioning part 14, and the cooperation between the second positioning groove 121 and the support rod 22, are all for positioning and engaging the first sub-tube 201 and the second sub-tube 202, and the first part 301 and the second part 302, while limiting the relative position between the intermediate tube section 1 and the outer tube body 2. Based on this, this application also includes a locking structure, which is used to fix the first sub-tube 201 and the second sub-tube 202, and the first part 301 and the second part 302, thereby forming the entire measuring tube. The locking structure can be connected between the first sub-tube 201 and the second sub-tube 202, or between the first part 301 and the second part 302, or between the first sub-support 401 and the second sub-support 402. This application does not limit its application to this, and the locking structure will be described in detail below.

[0069] This application sets the various components of the measuring tube as separate structures, and achieves relative fixation between the intermediate tube section 1 and the outer tube body 2 by cooperating with the first positioning part 14 on the intermediate tube section 1 and the first positioning groove 21 on the outer tube body 2. After initial positioning, the various separate structures are fixedly connected into one unit by a locking structure. In this way, compared with the integrated packaging or welding assembly method of the measuring tube in the prior art, the assembly of the measuring tube in this application does not require other auxiliary assembly equipment or positioning tooling, which can reduce the assembly difficulty and production cost.

[0070] A sealing groove 23 is also provided circumferentially on the outer surface of the outer tube 2 near the hollow area. A sealing ring (not shown in the figure) is installed in the sealing groove 23. Since the end of the outer tube 2 is provided with a hollow area, in order to ensure that the fluid enters the intermediate tube section 1 after flowing through the hollow area and to prevent the fluid from leaking to the outside of the measuring tube through the hollow area, a sealing ring is provided on the downstream side of the hollow area. After the measuring tube is installed in the ultrasonic water meter, the sealing ring abuts against the inner wall of the ultrasonic water meter shell, thereby ensuring the sealing of the fluid in the flow direction and making the flow rate at various positions in the axial direction of the measuring tube tend to be consistent, thus ensuring the accuracy of the measurement results.

[0071] Combination Figure 2 , Figure 3 and Figure 5 ,in, Figure 5 This is a schematic diagram of a reflective sheet support according to an embodiment of this application. The reflective sheet support 4 has already been generally described above; that is, the cross-sectional area of ​​the reflective sheet support 4 gradually decreases along the direction from its first end to its second end. Further, in some embodiments, the outer surface of the reflective sheet support 4 is a continuous convex surface, and the radius of curvature of the outer surface of the reflective sheet support 4 continuously increases from its second end to its first end.

[0072] Thus, the surface of the reflector support 4 is a continuous convex curved surface, and the cross-sectional area gradually increases along the fluid flow direction. The second end of the reflector support 4 faces the incoming flow direction. After the fluid flows to the second end of the reflector support 4, the outer surface of the reflector support 4 can smoothly guide the fluid flow, effectively suppressing or delaying boundary layer separation, reducing eddies, and thus reducing pressure differential resistance. This not only improves the uniformity of flow velocity and the accuracy of metering, but also reduces pressure loss, which helps to reduce pipeline energy consumption.

[0073] Furthermore, in one embodiment of this application, the reflector support 4 is semi-ellipsoidal. It should be noted that the aforementioned "semi-ellipsoid" refers to half of an ellipsoid formed by rotating an ellipse around its major axis. However, it must be emphasized that the cross-section of this "semi-ellipsoid" is not a vertical plane; the angle between the cross-section of the semi-ellipsoid and its axis is 45°. This is to satisfy the reflection path relationship of the ultrasonic waves emitted by the transducer in the ultrasonic water meter within the measuring tube, which is well-known in the art and will not be elaborated upon here. The cross-section of the aforementioned semi-ellipsoid constitutes the mounting surface for installing the reflector, i.e., the angle between the reflector and the axis of the measuring tube is 45°.

[0074] Taking the accompanying drawings of this application as an example, when the above method is adopted, the minimum radius of curvature of the outer surface of the reflector bracket 4 is 1.266 mm, and the maximum radius of curvature is 56.8896 mm. Of course, the above is only an example of the reflector bracket 4 of this application, and it does not constitute a limitation of this application.

[0075] Furthermore, a slot 41 is provided on the mounting surface of the reflector bracket 4, so that the reflector can be snapped and fixed in the slot when the reflector is installed.

[0076] Reference Figure 2 There is a gap between the first end of the reflector bracket 4 and the flow-guiding arc surface of the guide vane 13, and the end of the first end of the reflector bracket 4 closest to the intermediate pipe section 1 in the axial direction of the measuring tube is located within the opening plane of the flared part 12. In this way, while ensuring the compactness of the measuring tube and minimizing the axial length of the measuring tube, the fluid can flow smoothly into the intermediate pipe section 1 after leaving the reflector bracket 4, reducing the disturbance to the fluid caused by changes in pipe diameter or component obstruction.

[0077] Reference Figure 5 , Figure 6 and Figure 7 In one embodiment of this application, a locking structure is disposed between a first sub-support 401 and a second sub-support 402. Specifically, the locking structure includes a hook 4011 disposed on the first sub-support 401 and a locking portion 4021 disposed on the second sub-support 402. The hook 4011 is integrally formed with the first sub-support 401, and the locking portion 4021 is integrally formed on the second sub-support 402. The hook 4011 extends toward the inner side of the second sub-support 402, and the locking portion 4021 is provided with a working surface 4022 that engages with the hook 4011. During the relative movement and engagement of the first sub-support 401 and the second sub-support 402, the hook 4011 moves toward the locking portion 4021 and deforms until it moves to the position of the working surface 4022 and engages with it, thereby fixing the first sub-support 401 and the second sub-support 402 relative to each other.

[0078] Since the first sub-support 401 is fixedly connected to the first part 301, the first part 301 is fixedly connected to the first sub-tube 201, the second sub-support 402 is fixedly connected to the second part 302, and the second part 302 is fixedly connected to the second sub-tube 202, the various parts of the entire measuring tube are locked and fixed into an integrated structure when the first sub-support 401 and the second sub-support 402 are snapped and fixed.

[0079] In addition, after the first sub-support 401 and the second sub-support 402 are snapped together, the hook 4011 and the snap-fit ​​part 4021 together form a support surface for installing the reflector, and the plane formed by the hook 4011 and the snap-fit ​​part 4021 is the bottom surface of the slot.

[0080] As can be seen above, the various components of the measuring tube are connected by snap-fit, eliminating the need for additional locking parts. This not only saves costs but also improves assembly efficiency.

[0081] One of the two opposing surfaces of the first sub-support 401 and the second sub-support 402 is provided with a limiting protrusion 403, and the other is provided with a limiting groove 404. After the first sub-support 401 and the second sub-support 402 are fastened together, the limiting protrusion 403 is embedded in the limiting groove 404. The setting of the limiting protrusion 403 and the limiting groove 404 plays an auxiliary guiding role in the fastening of the first sub-support 401 and the second sub-support 402. On the one hand, it helps to quickly determine the relative position between the first sub-support 401 and the second sub-support 402 so as to facilitate rapid fastening. On the other hand, it also plays a limiting role to prevent misalignment between the first sub-support 401 and the second sub-support 402 during or after fastening.

[0082] Optionally, the extension trajectory of the limiting protrusion 403 is consistent with the edge trajectory of the first sub-support 401 and the second sub-support 402, forming a V-shape or a U-shape. In this way, after the limiting protrusion 403 cooperates with the limiting groove 404, it can restrict the relative movement of the first sub-support 401 and the second sub-support 402 in all directions, further improving the limiting effect.

[0083] In one implementation, the reflector support 4 is hollow, which not only saves material costs but also reduces the weight of the reflector support 4, thereby meeting the design requirements for lightweight measuring tubes.

[0084] Reference Figure 1 , Figure 2 and Figure 3In one embodiment of this application, the measuring tube is designed to be bidirectionally symmetrical. Specifically, taking the intermediate tube segment 1 as a reference, the intermediate tube segment 1 has a symmetrical plane 100 along its axial direction. That is, the symmetrical plane 100 is a cross-section of the intermediate tube segment 1 along the radial direction. Both ends of the intermediate tube segment 1 are provided with flared portions 12. The two flared portions 12 are symmetrical with respect to the symmetrical plane 100. The guide vanes 13 in the intermediate tube segment 1 and the guide arc surfaces at both ends of the guide vanes 13 are also symmetrical with respect to the symmetrical plane 100.

[0085] For the outer tube 2, both ends are also provided with hollow areas and support rods 22 located between the hollow areas. The hollow areas and support rods 22 at both ends of the outer tube 2 are symmetrical with respect to the plane of symmetry 100. Moreover, both ends of the middle tube section 1 are provided with first positioning parts 14, and both ends of the outer tube 2 are also provided with first positioning grooves 21 corresponding to the first positioning parts 14.

[0086] Correspondingly, one rectifier 3 and one reflector bracket 4 are respectively provided on both sides of the intermediate pipe section 1 along the axial direction, and the two rectifiers 3 and the two reflector brackets 4 are symmetrical about the plane of symmetry 100.

[0087] In addition, sealing grooves 23 are provided at both ends of the outer surface of the outer tube 2 near the hollow area, and the two sealing grooves are also symmetrical to the plane 100.

[0088] In summary, the measuring tube of this application is equipped with a rectifier 3, a reflector bracket 4, and other functional components at both ends. The structural composition of both ends of the measuring tube is identical and symmetrical with respect to the plane of symmetry 100°. Thus, the measuring tube of this application exhibits a bidirectional symmetrical design in the axial direction. The measuring tube has no specific "inlet" or "outlet" direction restriction. Regardless of which end the fluid flows into the measuring tube from, the rectifier 3 and reflector bracket 4 can regulate the fluid flow, reduce pressure loss, and form a uniform flow field. Therefore, during the installation of the measuring tube to the ultrasonic water meter casing and the installation of the ultrasonic water meter to the pipeline network, there is no need to distinguish the installation direction, which is beneficial for the installation of both the measuring tube and the ultrasonic water meter. Furthermore, this bidirectional symmetrical design enables the measuring tube to have bidirectional metering capabilities. In modern smart water management and refined metering management, especially in special and complex application scenarios such as pipeline monitoring, water volume scheduling, and areas prone to backflow, this bidirectional metering function not only meets the metering requirements but also helps improve metering accuracy and reduce pipeline energy consumption.

[0089] As described above, by adopting the aforementioned technical solution, this application effectively improves the flow velocity in the measurement area through the integrated structural design between the rectifier 3 and the reflector bracket 4, and the flow resistance reduction characteristics of the reflector bracket 4. This makes the ultrasonic signal more sensitive to changes in flow velocity, thereby improving the accuracy of low-velocity measurements and increasing the measurement range of the ultrasonic water meter. Simultaneously, this bidirectional symmetrical design also solves the problems of unidirectional flow stability and large bidirectional metering errors in traditional methods, enabling bidirectional UOD0 (no straight pipe sections are required before or after the ultrasonic water meter).

[0090] This application also discloses an ultrasonic water meter, which includes the measuring tube in any of the above embodiments.

[0091] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A measuring tube, characterized in that include: The intermediate pipe section (1) has a first positioning part (14) on its outer surface. The outer tube (2) includes a first sub-tube (201) and a second sub-tube (202) that are independent of each other. The first sub-tube (201) has a first groove (2011) and the second sub-tube (202) has a second groove (2021) that is opposite to the first groove (2011). The first sub-tube (201) and the second sub-tube (202) are fastened together to form the outer tube (2) and surround the outside of the middle tube section (1). The first groove (2011) and the second groove (2021) together form a first positioning groove (21). The first positioning part (14) is adapted to the first positioning groove (21) to restrict the relative movement between the middle tube section (1) and the outer tube (2). A rectifier (3) is disposed on both sides of the intermediate pipe section (1) and the outer pipe body (2); A reflector bracket (4) is disposed inside the outer tube (2) and located between the rectifier (3) and the intermediate tube section (1). The reflector bracket (4) is connected to the rectifier (3). A locking structure is used to secure the first sub-tube (201) and the second sub-tube (202).

2. The measuring tube according to claim 1, characterized in that The rectifier (3) includes a first part (301) and a second part (302) that are independent of each other. The first part (301) is connected to the first sub-tube (201), and the second part (302) is connected to the second sub-tube (202). The reflector support (4) includes a first sub-support (401) and a second sub-support (402) that are independent of each other. The first sub-support (401) is connected to the first part (301), and the second sub-support (402) is connected to the second part (302).

3. The measuring tube according to claim 2, characterized in that The locking structure includes a hook (4011) disposed on the first sub-support (401) and a snap-fit ​​part (4021) disposed on the second sub-support (402). The snap-fit ​​part (4021) includes a working surface (4022) that cooperates with the hook (4011). When the hook (4011) is snapped and fixed with the working surface (4022), the first sub-support (401) and the second sub-support (402) are fastened together to form the reflector support (4).

4. The measuring tube according to any one of claims 1 to 3, characterized in that The intermediate pipe section (1) includes a reduced diameter section (11) and flared sections (12) respectively disposed at both ends of the reduced diameter section (11). The diameter of the flared section (12) gradually increases in the direction away from the reduced diameter section (11).

5. The measuring tube according to claim 4, characterized in that, The outer tube (2) is provided with a plurality of support rods (22) at circumferential intervals at the end near the rectifier (3), and a hollow area is formed between adjacent support rods (22). The rectifier (3) is connected to the support rods (22). The flared portion (12) extends into the hollow area, and the flared portion (12) is provided with a plurality of second positioning grooves (121) that are adapted to the support rod (22) along the circumferential direction. The support rod (22) is embedded in the second positioning groove (121).

6. The measuring tube according to claim 5, characterized in that, The first groove (2011) and the second groove (2021) are both close to the hollow area so that the first positioning groove (21) communicates with the hollow area; The first positioning part (14) is disposed at the connection between the flared part (12) and the reduced diameter part (11), and the first positioning part (14) is at least partially located in the first positioning groove (21).

7. The measuring tube according to claim 5, characterized in that, A sealing groove (23) is provided circumferentially on the outer surface of the outer tube (2) near the end of the hollow area, and a sealing ring is provided in the sealing groove (23).

8. The measuring tube according to claim 4, characterized in that, The inner wall of the intermediate pipe section (1) is provided with a plurality of flow guide vanes (13) in the circumferential direction, and each of the flow guide vanes (13) extends along the axial direction of the intermediate pipe section (1). The end of the guide vane (13) extends to the flared portion (12), and the end of the guide vane (13) is provided with a guide arc surface.

9. The measuring tube according to claim 1, characterized in that, The rectifier (3) is integrally formed with the outer tube (2); and / or The rectifier (3) and the reflector bracket (4) are integrally formed.

10. An ultrasonic water meter, characterized in that, The measuring tube includes any one of claims 1 to 9.

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