Ultrasonic measurement structure

Abstract

The embodiment of the present application provides an ultrasonic measuring structure, comprising: a measuring tube body, an installation seat is arranged on the outer periphery of the measuring tube body, the inner cavity of the installation seat is communicated with the inner cavity of the measuring tube body, the installation seat has a top opening, and a first buckle is arranged on the outer side of the installation seat; an ultrasonic transducer extends into the inner cavity of the installation seat through the top opening of the installation seat; an elastic sealing piece is elastically supported between the installation seat and the ultrasonic transducer; a gland is provided with a second buckle, the gland can cover the top opening of the installation seat from top to bottom in the height direction of the installation seat, and the second buckle and the first buckle are buckled and connected, and the gland can also extrude the ultrasonic transducer towards the inside of the installation seat. The ultrasonic measuring structure is convenient to assemble, and the assembly efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic measurement, and more specifically to an ultrasonic measurement structure. Background Technology

[0002] Ultrasonic measurement structures, such as ultrasonic gas meters, are a new type of measurement structure that differs from traditional mechanical and electronic diaphragm flow meters. Their working principle is based on the time-of-flight method to measure gas flow velocity; that is, the flow velocity is reflected by measuring the difference in speed of the ultrasonic signal as it propagates upstream and downstream in the fluid. Because the time-of-flight method results in relatively small pressure loss in the pipeline and high accuracy in flow measurement, it is widely used.

[0003] However, current ultrasonic measurement structures typically use a gland to mount the ultrasonic transducer onto the mounting base of the measurement tube. The gland is fixed to the mounting base with screws, which can loosen and have low assembly efficiency. Summary of the Invention

[0004] Therefore, the object of the present invention is to provide an ultrasonic measurement structure to solve at least one problem existing in the prior art.

[0005] One embodiment of the present invention provides an ultrasonic measurement structure, comprising: a measuring tube body, a mounting seat disposed on the outer periphery of the measuring tube body, the inner cavity of the mounting seat communicating with the inner cavity of the measuring tube body, the mounting seat having a top opening, and a first buckle disposed on the outer side of the mounting seat; an ultrasonic transducer extending into the inner cavity of the mounting seat through the top opening of the mounting seat; an elastic seal elastically supported between the mounting seat and the ultrasonic transducer; and a pressure cap, the pressure cap being provided with a second buckle, the pressure cap being able to cover the top opening of the mounting seat from top to bottom in the height direction of the mounting seat, and to engage the second buckle with the first buckle, the pressure cap also being able to press the ultrasonic transducer into the mounting seat.

[0006] Furthermore, in some embodiments, the resilient seal can also be resiliently supported between the ultrasonic transducer and the gland.

[0007] Furthermore, in some embodiments, a mounting gap is provided between the gland and the mounting base in the height direction of the mounting base to allow for the compression deformation of the resilient seal.

[0008] Furthermore, in some embodiments, one of the first and second latches is a latching hole, and the other is a latching portion, which extends into the latching hole, and the thickness of the portion of the latching portion extending into the latching hole is less than the height of the latching hole.

[0009] Furthermore, in some embodiments, the cap includes a top wall and a side wall, a portion of the ultrasonic transducer extends into the space enclosed by the top wall and the side wall, and a buckle plate extending in the direction of the measuring tube is provided on the side wall, with a second buckle provided on the buckle plate.

[0010] Furthermore, in some embodiments, there is a mounting gap between the lower edge of the cover sidewall and the top opening of the mounting base.

[0011] Furthermore, in some embodiments, a portion of the cover sidewall protrudes outward to form a protrusion and forms an expansion space on the inside, with the buckle extending from the protrusion toward the direction of the measuring tube, and the first buckle extending into the expansion space.

[0012] Furthermore, in some embodiments, a cable receiving cavity is provided within the first latch, which is connected to the expansion space and is used to accommodate the cable electrically connected to the ultrasonic transducer.

[0013] Furthermore, in some embodiments, the first snap fastener includes two spaced-apart baffles, the two baffles being higher than the top opening of the mounting base, and the two baffles having protruding latches on the side opposite to the mounting base, the latches engaging with the second snap fastener, and a cable receiving cavity being formed between the two baffles.

[0014] Furthermore, in some embodiments, one of the two baffles is provided with a limiting baffle extending in the direction of the other baffle, and a gap is left between the limiting baffle and the other baffle for the cable to extend into the cable receiving cavity. The limiting baffle is used to restrict the cable from leaving the cable receiving cavity.

[0015] Furthermore, in some embodiments, mounting grooves are respectively provided on opposite sides of the measuring tube body, and the ultrasonic measuring structure also includes a measuring circuit board. The measuring circuit board is disposed in the mounting groove, and a wire-passing hole is provided on the groove sidewall corresponding to the cable receiving cavity, so that the cable passes through the wire hole and extends into the mounting groove and is electrically connected to the measuring circuit board.

[0016] Furthermore, in some embodiments, an annular protrusion is formed on the outer periphery of the ultrasonic transducer, and a protruding abutment is provided on the cover at a position corresponding to the annular protrusion. The cover presses the annular protrusion through the abutment to press the ultrasonic transducer into the mounting base. The abutment has a clearance opening for the cable electrically connected to the ultrasonic transducer to pass through.

[0017] Furthermore, in some embodiments, a wiring gap is left between the top wall of the cover and the top of the ultrasonic transducer to accommodate cables electrically connected to the ultrasonic transducer.

[0018] Furthermore, in some embodiments, the resilient seal is resiliently supported between the annular protrusion and the stepped surface; and / or the resilient seal is resiliently supported between the abutment portion and the annular protrusion.

[0019] Furthermore, in some embodiments, the cross-section of the elastic seal is C-shaped, including an integrally formed first sealing section, a second sealing section, and a third sealing section. The first sealing section is elastically supported between the inner wall of the mounting base and the outer wall of the annular protrusion. The second sealing section is elastically supported between the side of the annular protrusion facing the measuring tube and the stepped surface. The third sealing section is elastically supported between the abutment portion and the annular protrusion.

[0020] Furthermore, in some embodiments, a first convex structure is provided on the outer side of the first sealing section, and the first sealing section abuts against the inner sidewall of the mounting base through the first convex structure; and / or a second convex structure is provided on the side of the second sealing section facing the step surface, and the second sealing section abuts against the step surface through the second convex structure; and / or a third convex structure is provided on the third sealing section, and the third sealing section abuts against the abutting portion through the third convex structure.

[0021] Furthermore, in some embodiments, the ultrasonic measuring structure further includes: a mounting cover, on which a third buckle is provided, and on the inner sidewall of the mounting groove a fourth buckle is provided, wherein the third buckle and the fourth buckle are engaged and connected.

[0022] Furthermore, in some embodiments, the inner surface of the mounting cover is provided with a limiting rib, the groove of the mounting groove is provided with a limiting countersunk platform communicating with the mounting groove, the limiting rib extends into the limiting countersunk platform, and the third buckle is provided on the side of the limiting rib away from the middle of the mounting cover; and / or the groove sidewall of the mounting groove is also provided with a circuit board slot, and the edge of the measuring circuit board is locked in the circuit board slot.

[0023] Furthermore, in some embodiments, the measuring tube has independent measuring channels and non-measuring channels inside, and the inner cavity of the mounting base is connected to the measuring channels, so that the ultrasonic transducer transmits ultrasonic waves only through the measuring channels.

[0024] Furthermore, in some embodiments, the number of measuring channels is one, and the number of non-measuring channels is at least two, with the at least two non-measuring channels distributed on opposite sides of the measuring channel.

[0025] Furthermore, in some embodiments, the cross-section of the measuring channel is rectangular, and the cross-section of the non-measuring channel is circular, racetrack-shaped, elliptical, or rectangular; and / or multiple channels are provided on the measuring tube body, extending through the measuring tube body along its length, the multiple channels forming a measuring channel and a non-measuring channel.

[0026] The ultrasonic measurement structure provided in this embodiment of the invention fixes the ultrasonic transducer by pressing the cover down from top to bottom in the height direction of the mounting base, and by connecting the cover with the first buckle through the second buckle. Compared with fixing the cover to the mounting base with screws, the installation is convenient and quick, improves assembly efficiency, and can prevent the cover from loosening and falling off the mounting base.

[0027] Further aspects and / or advantages of the general concept of the invention will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of the general concept of the invention. Attached Figure Description

[0028] The above and other objects and features of the present invention will become clearer from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0029] Figure 1 A schematic diagram of the ultrasonic measurement structure according to an embodiment of this application is shown;

[0030] Figure 2 A partial structural schematic diagram of an ultrasonic measurement structure according to an embodiment of this application is shown;

[0031] Figure 3 Another partial structural schematic diagram of an ultrasonic measurement structure according to one embodiment of this application is shown;

[0032] Figure 4 Another partial structural schematic diagram of an ultrasonic measurement structure according to an embodiment of this application is shown;

[0033] Figure 5 A partial top view schematic diagram of an ultrasonic measurement structure according to an embodiment of this application is shown;

[0034] Figure 6 A longitudinal cross-sectional schematic view of an ultrasonic measurement structure according to an embodiment of this application is shown;

[0035] Figure 7 It shows Figure 6 A magnified view of a portion of point I in the middle;

[0036] Figure 8 A partial cross-sectional schematic diagram of an ultrasonic measurement structure according to an embodiment of this application is shown;

[0037] Figure 9 A schematic diagram of the structure of an embodiment of this application with the cap inverted is shown;

[0038] Figure 10 A schematic diagram of the structure of the mounting cover according to an embodiment of this application is shown;

[0039] Figure 11 A partial side view schematic diagram of an ultrasonic measurement structure according to an embodiment of this application is shown;

[0040] Figure 12 A partial side view schematic diagram of an ultrasonic measurement structure according to another embodiment of this application is shown;

[0041] Figure 13 A partial side view schematic diagram of an ultrasonic measurement structure according to another embodiment of this application is shown;

[0042] Figure 14 A partial side view schematic diagram of an ultrasonic measurement structure according to yet another embodiment of this application is shown;

[0043] Figure 15 A partial structural diagram of the interior of the mounting base according to an embodiment of this application is shown;

[0044] Figure 16 A partial structural diagram of the interior of the mounting base according to another embodiment of this application is shown.

[0045] Figures 1 to 16 Explanation of icon numbers:

[0046] 100 Measuring tube body; 101 Measuring flow channel; 1011 First opening; 102 Non-measuring flow channel; 1021 Second opening; 110 Mounting base; 111 Stepped surface; 112 Inner cavity; 120 Mounting groove; 121 Fourth snap-fit; 122 Circuit board slot; 123 Limiting countersunk platform; 130 Wire through hole;

[0047] 200 Ultrasonic transducer; 210 Annular protrusion; 220 Cable;

[0048] 300 Cap; 310 Cap top wall; 320 Cap side wall; 321 Protrusion; 322 Expansion space; 330 Buckle plate; 340 Abutment part; 350 Installation gap; 360 Wiring gap; 370 Flanged structure;

[0049] 400 Elastic seal; 410 First sealing section; 411 First convex structure; 420 Second sealing section; 421 Second convex structure; 430 Third sealing section; 431 Third convex structure;

[0050] 510 First latch; 511 Baffle; 512 Clamping tongue; 513 Cable receiving cavity; 514 Limiting rib; 520 Second latch;

[0051] 600 Mounting cover; 610 Third buckle; 620 Limiting rib. Detailed Implementation

[0052] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but may be changed as will become clear upon understanding this disclosure, except for operations that must occur in a specific order. Furthermore, for clarity and conciseness, descriptions of features known in the art may be omitted.

[0053] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein, which will become clear upon understanding the disclosure of this application.

[0054] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more.

[0055] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts should not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Thus, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0056] In the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to," or "bonded to" another element, the element may be directly "on" another element, directly "connected to," or "bonded to" the other element, or one or more other elements may be present in between. Conversely, when an element is described as being "directly on" another element, "directly connected to," or "directly bonded to" another element, no other elements may be present in between.

[0057] The terminology used herein is for the purpose of describing various examples only and is not intended to limit disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the described features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. The term “a plurality” represents any quantity of two or more.

[0058] The directional terms such as "above", "below", "top" and "bottom" used in this application are all for the convenience of description, based on the orientation shown in the diagram.

[0059] Unless otherwise defined, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains upon understanding the invention. Unless expressly defined herein, terms such as those defined in a general dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this invention, and shall not be interpreted in an idealized or overly formalistic manner.

[0060] The following will combine Figures 1 to 16 The ultrasonic measurement structure provided by the embodiments of the present invention is described.

[0061] like Figures 1 to 5 , Figure 8 and Figure 9 As shown, a first aspect embodiment of the present invention provides an ultrasonic measurement structure, comprising: a measuring tube 100, a mounting base 110 disposed on the outer periphery of the measuring tube 100, the inner cavity 112 of the mounting base 110 communicating with the inner cavity of the measuring tube 100, the mounting base 110 having a top opening, and a first buckle 510 disposed on the outer side of the mounting base 110; an ultrasonic transducer 200 extending into the inner cavity 112 of the mounting base 110 through the top opening of the mounting base 110; an elastic seal 400 elastically supported between the mounting base 110 and the ultrasonic transducer 200; and a pressure cap 300, on which a second buckle 520 is disposed, the pressure cap 300 being able to cover the top opening of the mounting base 110 from top to bottom in the height direction of the mounting base 110, and to engage the second buckle 520 and the first buckle 510, the pressure cap 300 also being able to press the ultrasonic transducer 200 into the mounting base 110.

[0062] The ultrasonic measurement structure provided in this embodiment of the invention fixes the ultrasonic transducer 200 by pressing the cover 300 down from top to bottom in the height direction of the mounting base 110, and by engaging the second buckle 520 with the first buckle 510. Compared with fixing the cover 300 to the mounting base 110 with screws, the installation is convenient and quick, improves assembly efficiency, and can prevent the cover 300 from loosening and detaching from the mounting base 110.

[0063] Furthermore, the elastic seal 400 is an independent component. As the gland 300 is pressed down, the elastic seal 400 is elastically supported between the mounting base 110 and the ultrasonic transducer 200, resulting in a good sealing effect. Compared with related technologies where the elastic seal 400 and the ultrasonic transducer 200 are integrally injection molded, the elastic seal 400 can be manufactured separately, which is convenient, efficient, and reduces production costs.

[0064] Furthermore, such as Figures 1 to 6 As shown, there can be two mounting bases 110, and each mounting base 110 is equipped with an ultrasonic transducer 200. The ultrasonic transmission paths of the two ultrasonic transducers 200 can be as follows: Figure 6 The dashed line indicates a V-shape. Additionally, Figure 6 The middle arrow indicates the direction of fluid flow.

[0065] Of course, if a reflective structure such as a reflector is added, the ultrasonic transmission path between the two ultrasonic transducers 200 can also be W-shaped, etc., and is not limited to the above example.

[0066] Furthermore, such as Figures 1 to 5 , Figure 9 As shown, there can be two first clips 510, distributed on opposite sides of each mounting base 110. There can also be two second clips 520, distributed on opposite sides of the pressure cap 300. The first clips 510 and the second clips 520 can be connected in a one-to-one manner. With this double-clip connection, the pressure cap 300 is securely installed.

[0067] Of course, in other embodiments, the number of the first latch 510 and the second latch 520 may also be three or more.

[0068] Furthermore, in some embodiments, such as Figure 6 and Figure 7As shown, the elastic seal 400 can also elastically support the ultrasonic transducer 200 and the gland 300. In this case, the elastic seal 400 can support the ultrasonic transducer 200 in both vertical and horizontal directions, effectively reducing the impact of pipeline vibration or other external forces on the ultrasonic transducer 200 and lowering the probability of damage. Furthermore, it can also prevent the ultrasonic transducer 200 from being damaged by collisions with the mounting base 110 or the gland 300 during assembly.

[0069] Furthermore, in some embodiments, such as Figures 6 to 8 As shown, in the height direction of the mounting base 110, a mounting gap 350 is provided between the gland 300 and the mounting base 110 to allow for the compression deformation of the elastic seal 400. In other words, when the first snap-fit ​​510 and the second snap-fit ​​520 are engaged, the mounting gap 350 between the gland 300 and the mounting base 110 allows the elastic seal 400 to be further compressed after being squeezed by the mounting base 110 and the ultrasonic transducer 200, retaining a certain amount of compression. This allows the ultrasonic transducer 200 to form a flexible pipe section assembly structure after assembly, reducing the impact of pipe vibration or other external forces on the ultrasonic transducer 200 and lowering the probability of damage to the ultrasonic transducer 200.

[0070] Of course, in other embodiments, the pressure cap 300 may not have an installation gap 350 between it and the mounting base 110, and the pressure cap 300 may directly abut against the 110.

[0071] Furthermore, in some embodiments, such as Figure 8 and Figure 9 As shown, one of the first latch 510 and the second latch 520 is a latching hole, and the other is a latching part. The latching part extends into the latching hole, and the thickness of the portion of the latching part extending into the latching hole is less than the height of the latching hole. With this design, when the ultrasonic measuring structure is subjected to vibration or impact, causing the elastic seal 400 to compress and deform, the latching part can move a certain distance relative to the latching hole without disengaging. This ensures the stable connection of the gland 300 while facilitating the deformation of the elastic seal 400, thus achieving a vibration reduction effect.

[0072] In practical applications, under natural conditions, such as Figure 8As shown, the elastic seal 400 is elastically supported between the mounting base 110 and the ultrasonic transducer 200. The pressure cap 300 presses down on the ultrasonic transducer 200, and at the same time, the snap-fit ​​part extends into the snap-fit ​​hole and engages with the upper edge of the snap-fit ​​hole. When the measuring tube 100 vibrates, the elastic seal 400 may elastically deform with the vibration of the measuring tube 100. During compression, the ultrasonic transducer 200 will move down a certain distance, and the pressure cap 300 pressing the ultrasonic transducer 200 will also move down a certain distance, causing the snap-fit ​​part to move down a certain distance within the snap-fit ​​hole, but without disengaging from the snap-fit ​​hole. When the elastic seal 400 resets, the snap-fit ​​part will also move up with the pressure cap 300 and re-engage with the upper edge of the snap-fit ​​hole.

[0073] Of course, in other embodiments, the mounting gap 350 between the pressure cap 300 and the mounting base 110 may not be present. In this case, the thickness of the portion of the snap-fit ​​part that extends into the snap-fit ​​hole may be equal to the height of the snap-fit ​​hole, so that the two are perfectly matched.

[0074] Furthermore, the snap-fit ​​part is provided with a cable receiving cavity 513 for accommodating the cable 220 that is electrically connected to the ultrasonic transducer 200. By placing the cable 220 inside the snap-fit ​​part, the snap-fit ​​part can limit the cable 220 and achieve cable tidying. Also, because the cable 220 is located inside the snap-fit ​​part, the pressure cap 300 can be prevented from squeezing the cable 220 when the snap-fit ​​part engages with the snap-fit ​​hole.

[0075] In one specific embodiment, the latching part may include two baffles 511 spaced apart, and the two baffles have protruding latches 512 on the side facing the latching hole. The latches 512 are fastened to the latching hole, and a cable receiving cavity 513 is formed between the two baffles 511.

[0076] To prevent cable 220 from easily detaching from cable receiving cavity 513, such as Figure 4 As shown, one of the baffles 511 can be provided with a limiting rib 514 extending in the direction of the other baffle 511. A gap is left between the limiting rib 514 and the other baffle 511 for the cable 220 to enter the cable receiving cavity 513. The limiting rib 514 is used to prevent the cable 220 from leaving the cable receiving cavity 513. In this way, during the installation process, the cable 220 can be pressed into the cable receiving cavity 513 through the gap between the limiting rib 514 and the other baffle 511, and then the limiting rib 514 can be used to prevent the cable 220 from being squeezed during the installation of the cover 300.

[0077] The width of this gap can be slightly smaller than the diameter of the cable 220, or equal to or slightly larger than the diameter of the cable 220, to facilitate the insertion of the cable 220 into the cable receiving cavity 513 while providing a good limiting effect. Furthermore, the height of the limiting rib 514 can also be less than the height of the baffle 511, which can provide a limiting effect while making it easier to press the cable 220 in. Of course, the height of the limiting rib 514 can also be the same as the height of the baffle 511.

[0078] In addition, limiting ribs 514 can be provided on both baffles 511. In this case, the two limiting ribs 514 can be staggered to facilitate the cable 220 to extend into the cable receiving cavity 513.

[0079] In another specific embodiment, the latching part may further include a connecting post (not shown in the figure), which has a cable receiving cavity 513 inside and a latching tongue 512 on the outside of the connecting post, which is used to engage with the latching hole. In this case, the cable 220 can be inserted into the cable receiving cavity 513 from the height direction of the connecting post.

[0080] Furthermore, in some embodiments, such as Figure 8 and Figure 9 As shown, the cover 300 includes a top wall 310 and a side wall 320. A portion of the ultrasonic transducer 200 extends into the space enclosed by the top wall 310 and the side wall 320. A buckle 330 extending toward the measuring tube 100 is provided on the side wall 320. A second buckle 520 is provided on the buckle 330.

[0081] Here, the ultrasonic transducer 200 is not completely embedded in the inner cavity 112 of the mounting base 110, but is partially embedded in the mounting base 110 and partially extends into the pressure cover 300. This facilitates the connection between the cable 220 and the part of the ultrasonic transducer 200 that extends out of the mounting base 110, and then the pressure cover 300 is assembled, making wiring convenient.

[0082] Furthermore, a buckle plate 330 extending towards the measuring tube 100 is provided on the side wall 320 of the cover, and the second buckle 520 is set on the buckle plate 330 to facilitate fastening and connection with the first buckle 510 on the outside of the mounting base 110.

[0083] Furthermore, such as Figure 7 and Figure 8 As shown, the lower edge of the cover sidewall 320 and the top opening of the mounting base 110 can have the aforementioned mounting gap 350. This allows for a certain amount of compression to be provided for the elastic deformation of the elastic seal 400, achieving a flexible pipe section assembly structure.

[0084] Furthermore, such as Figure 7 and Figure 9As shown, the lower edge of the cover sidewall 320 can also have an outwardly protruding flange structure 370, which covers the opening edge of the top opening of the mounting base 110 in the height direction of the mounting base 110, and creates a mounting gap 350 between the flange structure 370 and the top opening of the mounting base 110. The flange structure 370 can effectively cover the inner cavity 112 of the mounting base 110, resulting in a good appearance and preventing external dust and other impurities from entering the inner cavity 112 of the mounting base 110.

[0085] Of course, in other embodiments, the above-mentioned flange structure 370 may not be provided. In this case, the inner diameter of the cover sidewall 320 may be larger than the inner diameter of the top opening of the mounting base 110, and the inner cavity 112 of the mounting base 110 may be directly covered by the cover sidewall 320.

[0086] Furthermore, in some embodiments, such as Figure 8 and Figure 9 As shown, a portion of the cover sidewall 320 protrudes outward to form a protrusion 321 and forms an expansion space 322 on the inner side. The buckle 330 extends from the protrusion 321 toward the direction of the measuring tube 100, and the first buckle 510 extends into the expansion space 322.

[0087] In these embodiments, when the cover 300 is placed on the mounting base 110, the cover 300 can cover the first buckle 510 and make the first buckle 510 and the second buckle 520 fasten together. The first buckle 510 will not be exposed in a large area, and the appearance is aesthetically pleasing.

[0088] Furthermore, in some embodiments, such as Figures 1 to 5 , Figure 8 and Figure 9 As shown, the first latch 510 has a cable receiving cavity 513, which communicates with the expansion space 322 and is used to accommodate the cable 220 that is electrically connected to the ultrasonic transducer 200. This allows the cable 220, which is electrically connected to the ultrasonic transducer 200, to easily extend into the cable receiving cavity 513 within the first latch 510 for wiring. Furthermore, since the cable receiving cavity 513 is located inside the first latch 510, the pressure cover 300 will not compress the cable 220 when it is fastened to the first latch 510 via the second latch 520.

[0089] In a specific embodiment, such as Figure 4 and Figure 5 As shown, the first buckle 510 can be a buckle part, including two baffles 511 spaced apart. The two baffles 511 have protruding latches 512 on the side opposite to the mounting base 110. The latches 512 are fastened to the second buckle 520, and a cable receiving cavity 513 is formed between the two baffles 511.

[0090] In these embodiments, the two baffles 511 have protruding latches 512 on the side opposite to the mounting base 110. The latches 512 are fastened to the second buckle 520, forming a cable receiving cavity 513 between the two baffles 511. When the first buckle 510 and the second buckle 520 are engaged, the cover 300 will not squeeze the cable 220 in the cable receiving cavity 513, thus avoiding the occurrence of cable compression.

[0091] At this time, the second buckle 520 can be a buckle hole, or the second buckle 520 can be a buckle part, which is hooked together with the first buckle 510.

[0092] In addition, the cable receiving cavity 513 formed by the two baffles 511 has a large opening, which makes it convenient for the cable 220 to extend into the cable receiving cavity 513 through the opening.

[0093] Specifically, the two baffles 511 can be made higher than the top opening of the mounting base 110, so that they can extend into the outwardly expanding space 322 of the cover side wall 320 of the pressure cover 300. This facilitates the cable 220, which is electrically connected to the ultrasonic transducer 200, to extend approximately laterally and into the cable receiving cavity 513 between the two baffles 511, and then move down along the cable receiving cavity 513, making wiring convenient.

[0094] The specific structure of the first buckle 510 can be varied. It can accommodate the cable 220, and it can also have a latch 512 that cooperates with the second buckle 520. When the latch 512 and the second buckle 520 are engaged, it will not affect the cable 220 in the cable receiving cavity 513. All of these are in line with the technical concept of this embodiment and will not be listed in detail here.

[0095] In other embodiments, the second latch 520 may also have a cable receiving cavity, which communicates with the expansion space 322, for accommodating the cable 220 electrically connected to the ultrasonic transducer 200. In this case, the structures of the first latch 510 and the second latch 520 can be interchanged, so that the second latch 520 includes two spaced baffles 511, etc. Alternatively, both the first latch 510 and the second latch 520 may have cable receiving cavities, and after they are engaged and connected, the cable receiving cavities within the two latches are interconnected.

[0096] Furthermore, in some embodiments, such as Figure 2 and Figure 3As shown, mounting grooves 120 are respectively provided on opposite sides of the measuring tube 100. The ultrasonic measuring structure also includes a measuring circuit board (not shown in the figure), which is set in the mounting groove 120. A wire hole 130 is provided on the side wall of the mounting groove 120 corresponding to the cable 220 receiving groove, so that the cable 220 can extend into the mounting groove 120 through the wire hole 130 and be electrically connected to the measuring circuit board. The cable 220 is not exposed, and wiring is convenient.

[0097] Furthermore, in some embodiments, such as Figures 6 to 9 As shown, an annular protrusion 210 is formed on the outer periphery of the ultrasonic transducer 200, and a protruding abutment 340 is provided on the cover 300 at a position corresponding to the annular protrusion 210. The cover 300 presses the annular protrusion 210 through the abutment 340 to press the ultrasonic transducer 200 into the mounting base 110.

[0098] In these embodiments, the downward protruding abutment portion 340 on the pressure cap 300 abuts against the annular protrusion 210, thereby pressing down the ultrasonic transducer 200. Compared to pressing down the top of the ultrasonic transducer 200 directly through the top wall 310 of the pressure cap 300, the contact area between the two can be reduced, and the impact of pipeline vibration or external impact on the ultrasonic transducer 200 and the pressure cap 300 can be reduced.

[0099] Moreover, it allows for a gap between the top wall 310 of the cover 300 and the ultrasonic transducer 200, facilitating wiring and the placement of other components.

[0100] Furthermore, the abutment portion 340 has a clearance opening for the cable 220, which is electrically connected to the ultrasonic transducer 200, to pass through. This facilitates the routing of the cable 220.

[0101] As an example, such as Figure 9 As shown, the abutment portion 340 can be in the shape of a ring with a notch in the circumference, and the notch forms a clearance opening.

[0102] As an example, the abutment portion 340 is annular and has a radially penetrating clearance opening.

[0103] Furthermore, such as Figure 8 As shown, a wiring gap 360 is provided between the top wall 310 of the cover 300 and the top of the ultrasonic transducer 200 to accommodate the cable 220 that is electrically connected to the ultrasonic transducer 200. The wiring gap 360 provides space for the cable 220 to be arranged, making wiring convenient.

[0104] Furthermore, such as Figure 7 and Figure 8As shown, the inner wall of the mounting base 110 is provided with a stepped surface 111, and the elastic seal 400 is elastically supported between the annular protrusion 210 and the stepped surface 111. With this design, the annular protrusion 210 can not only cooperate with the abutment portion 340, but also abut against the stepped surface 111 through the elastic seal 400. Compared with setting two additional independent protrusion structures, the structure of the ultrasonic transducer 200 can be simplified.

[0105] Furthermore, such as Figures 6 to 8 As shown, the elastic seal 400 is also elastically supported between the abutment portion 340 and the annular protrusion 210. The elastic seal 400 can support the ultrasonic transducer 200 in both the vertical and horizontal directions, which can effectively reduce the impact of pipeline vibration or other external force impacts on the ultrasonic transducer 200 and reduce the probability of damage to the ultrasonic transducer 200.

[0106] The elastic seal 400 can be integrally formed or can consist of multiple independent sealing rings.

[0107] Regarding the specific structure of the resilient seal 400, further, in some embodiments, such as Figure 7 As shown, the cross-section of the elastic seal 400 is approximately C-shaped, comprising an integrally formed first sealing section 410, a second sealing section 420, and a third sealing section 430. The first sealing section 410 is elastically supported between the inner wall of the mounting base 110 and the outer wall of the annular protrusion 210. The second sealing section 420 is elastically supported between the side of the annular protrusion 210 facing the measuring tube 100 and the stepped surface 111. The third sealing section 430 is elastically supported between the abutment portion 340 and the annular protrusion 210. The elastic seal 400 encloses the annular protrusion 210 and provides multi-directional support between the mounting base 110 and the ultrasonic transducer 200, resulting in a good sealing effect.

[0108] Furthermore, such as Figure 7 As shown, a first convex structure 411 is provided on the outer side of the first sealing section 410, and the first sealing section 410 abuts against the inner wall of the mounting base 110 through the first convex structure 411; and / or a second convex structure is provided on the side of the second sealing section 420 facing the step surface 111, and the second sealing section 420 abuts against the step surface 111 through the second convex structure; and / or a third convex structure 431 is provided on the third sealing section 430, and the third sealing section 430 abuts against the abutting part 340 through the third convex structure 431. When compressed, the convex structure has a large deformation, which can fully fit with the inner wall of the mounting base 110, the step surface 111 and the abutting part 340, thereby improving the sealing effect of the elastic seal 400.

[0109] Specifically, the first convex structure 411, the second convex structure 421 and the third convex structure 431 can be continuously distributed in the circumferential direction of the elastic seal 400, providing circumferential sealing and good sealing effect.

[0110] Furthermore, the elastic seal 400 may also include a fourth sealing section located at the end of the second sealing section 420 away from the first sealing section 410 and extending in a direction away from the first sealing section 410. The fourth sealing section is elastically supported between the inner wall of the mounting base 110 and the ultrasonic transducer 200. Specifically, it is supported on the portion of the inner wall of the mounting base 110 below the stepped surface 111 and the portion of the ultrasonic transducer 200 below the annular protrusion 210, thereby increasing the contact area between the elastic seal 400 and the mounting base 110 and the ultrasonic transducer 200 and improving the sealing effect.

[0111] Of course, in other embodiments, the resilient seal 400 may also exclude the third sealing section 430 and the fourth sealing section, and may be designed according to sealing requirements and / or impact resistance requirements.

[0112] Furthermore, in some embodiments, such as Figures 1 to 3 , Figure 10 As shown, the ultrasonic measuring structure also includes: a mounting cover 600, on which a third buckle 610 is provided, and a fourth buckle 121 is provided on the inner side wall of the mounting groove 120, wherein the third buckle 610 and the fourth buckle 121 are fastened together. The mounting cover 600 is fastened to the mounting groove 120 by the buckles, making assembly convenient and quick.

[0113] As an example, there can be multiple third clips 610 and fourth clips 121, and they correspond one-to-one. The third clips 610 are distributed around the mounting cover 600 in a circumferential manner, which makes it convenient for the mounting cover 600 to be fastened at multiple points in the circumferential direction at the groove of the mounting groove 120, thereby improving the installation stability of the mounting cover 600.

[0114] Furthermore, such as Figure 2 , Figure 3 and Figure 10 As shown, a limiting rib 620 can be provided at the edge of the inner surface of the mounting cover 600, and a limiting countersunk platform 123 communicating with the mounting groove 120 is provided at the opening of the groove, with the limiting rib 620 extending into the limiting countersunk platform 123. The design of the limiting rib 620 and the limiting countersunk platform 123 facilitates the quick alignment of the mounting cover 600 at the opening of the mounting groove 120, preventing the mounting cover 600 from shaking significantly at the opening.

[0115] Of course, the limiting rib 620 can also be inserted into the mounting groove 120 and directly engaged with the side wall of the mounting groove 120 for limiting, without setting the limiting countersunk platform 123.

[0116] As an example, the limiting ribs 620 are distributed on opposite sides of the mounting cover 600, or each side edge has a limiting rib 620.

[0117] Furthermore, such as Figure 10 As shown, the third buckle 610 can be positioned on the side of the limiting rib 620 away from the middle of the mounting cover 600, so that the third buckle 610 can be fastened and connected to the fourth buckle 121 on the side wall of the mounting groove 120.

[0118] Furthermore, such as Figure 2 and Figure 3 As shown, a circuit board slot 122 can also be provided on the side wall of the mounting groove 120, and the edge of the measuring circuit board is locked in the circuit board slot 122. This facilitates the quick installation of the measuring circuit board by aligning it with the circuit board slot 122.

[0119] Furthermore, in some embodiments, such as Figures 11 to 14 As shown, the measuring tube 100 has independent measuring channels 101 and non-measuring channels 102 inside. The inner cavity 112 of the mounting base 110 is connected to the measuring channel 101 so that the ultrasonic transducer 200 transmits ultrasonic waves only through the measuring channel 101.

[0120] Specifically, such as Figure 5 As shown, a first opening 1011 can be made on the measuring tube 100 at the position corresponding to the measuring channel 101, so that the measuring channel 101 is connected to the inner cavity 112 of the mounting base 110 through the first opening 1011, thus facilitating the transmission of ultrasonic waves through the measuring channel 101. This prevents the non-measuring channel 102 from being connected to the inner cavity 112 of the mounting base 110.

[0121] In contrast to related technologies where both the measuring channel 101 and the non-measuring channel 102 are connected to the inner cavity 112 of the mounting base 110, and the ultrasonic transducer 200 has uneven flow velocity in each channel during measurement, resulting in inaccurate measurement results or requiring complex calculations, this embodiment ensures that the ultrasonic waves are transmitted only inside the measuring channel 101, thus avoiding the above-mentioned situation.

[0122] Of course, in other embodiments, the inner cavity 112 of the mounting base 110 may also be in communication with both the measuring channel 101 and the non-measuring channel 102. In this case, as... Figure 15 and Figure 16As shown, a first opening 1011 can be made on the measuring tube 100 at a position corresponding to the measuring flow channel 101, so that the measuring flow channel 101 communicates with the inner cavity 112 of the mounting base 110 through the first opening 1011. A second opening 1021 can be made on the measuring tube 100 at a position corresponding to the non-measuring flow channel 102, so that the non-measuring flow channel 102 communicates with the inner cavity 112 of the mounting base 110 through the second opening 1021. The measuring flow channel 101 is the main propagation area of ​​the ultrasonic wave, and the non-measuring flow channel 102 is the non-main propagation area of ​​the ultrasonic wave.

[0123] Furthermore, the number of first openings 1011 is one, and they can be rectangular, square, circular, or elliptical, etc.

[0124] Furthermore, the number of second openings 1021 can be the same as the number of non-measuring channels 102, and they can correspond one-to-one. Each non-measuring channel 102 can also correspond to at least two second openings 1021. The shape of the second opening 1021 can be rectangular, square, circular, or elliptical, etc. The number and shape of the second openings 1021 corresponding to each non-measuring channel 102 can be arbitrarily configured.

[0125] Furthermore, the number of measuring channels 101 can be one, and the number of non-measuring channels 102 can be at least two, with at least two non-measuring channels 102 distributed on opposite sides of the measuring channel 101.

[0126] Among them, such as Figures 11 to 14 As shown, the cross-section of the measuring channel 101 can be rectangular, while the cross-section of the non-measuring channel 102 can be circular, racetrack-shaped, elliptical, or rectangular, etc.

[0127] When there are multiple non-measuring channels, these channels may include regular and irregular shapes such as circles, ellipses, racetrack circles, triangles, squares, rectangles, and regular polygons, or at least two of these shapes.

[0128] Furthermore, the measuring tube 100 of the ultrasonic measuring structure can be integrally injection molded to directly form the measuring flow channel 101 and the non-measuring flow channel 102; alternatively, it can be injection molded into a solid measuring tube 100, with multiple channels extending along the length of the measuring tube 100 to form the measuring flow channel 101 and the non-measuring flow channel 102. Alternatively, it can be injection molded into a measuring tube 100 with an internal cavity, and then a partition plate is installed within the cavity to separate the measuring flow channel 101 and the non-measuring flow channel 102.

[0129] Furthermore, in some embodiments, the ultrasonic measuring structure is an ultrasonic gas meter. The measuring tube 100 is a plastic tube.

[0130] Of course, in other embodiments, the ultrasonic measuring structure can also be other flow meters, and the measuring tube 100 can also be a metal tube, etc.

[0131] The ultrasonic measurement structure provided in this embodiment of the invention allows the ultrasonic transducer 200 sealing structure to be installed in the mounting base 110, after which the pressure cap 300 can be directly and smoothly pressed down and engaged. This simplifies the assembly process and increases efficiency. The elastic sealing element 400 is manufactured and installed separately, resulting in high manufacturing efficiency, low cost, and a simple process. Furthermore, the structure of the first snap-fit ​​510 is improved to include a cable receiving cavity 513 to guide the cable 220, preventing cable compression issues during the assembly of the pressure cap 300.

[0132] A second aspect of the present invention provides a method for assembling an ultrasonic measuring structure, comprising:

[0133] An elastic seal 400 is assembled in the inner cavity 112 of the mounting base 110 of the measuring tube body 100;

[0134] The ultrasonic transducer 200 is inserted into the inner cavity 112 of the mounting base 110;

[0135] The pressure cap 300 is pressed onto the ultrasonic transducer 200, and the first buckle 510 and the second buckle 520 are fastened together. An installation gap 350 is left between the pressure cap 300 and the top of the mounting base 110, so that the elastic seal 400 has a compression margin, forming an elastic pipe section assembly structure.

[0136] Furthermore, it may also include the following steps:

[0137] Between the steps of pressing the gland 300 onto the ultrasonic transducer 200, the following is also included:

[0138] The cable 220 is electrically connected to the ultrasonic transducer 200, so that the cable 220 passes through the cable receiving cavity 513 and the wire hole 130 of the first buckle 510 and enters the mounting groove 120 of the measuring tube body 100; wherein, the cable 220 can be pressed into the cable receiving cavity 513 through the gap between the limiting baffle 514 and the baffle 511, and then the limiting baffle 514 limits the cable 220 in the cable receiving cavity 513;

[0139] The edge of the measuring circuit board is clipped into the circuit board slot 122 in the mounting groove 120, and the cable 220 is connected to the measuring circuit board.

[0140] Engage the third buckle 610 on the edge of the mounting cover 600 with the fourth buckle 121 on the inner side wall of the mounting groove 120, and extend the limiting rib 620 on the edge of the mounting cover 600 into the limiting recess 123 at the opening of the mounting groove 120.

[0141] While embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. It should be understood that, to those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present invention as defined in the claims.

Claims

1. An ultrasonic measuring structure, characterized in that, include: A measuring tube (100) is provided with a mounting seat (110) on its outer periphery. The inner cavity (112) of the mounting seat (110) is connected to the inner cavity of the measuring tube (100). The mounting seat (110) has a top opening and a first buckle (510) is provided on the outer side of the mounting seat (110). An ultrasonic transducer (200) extends into the inner cavity (112) of the mounting base (110) through the top opening of the mounting base (110); An elastic seal (400) is elastically supported between the mounting base (110) and the ultrasonic transducer (200); A pressure cap (300) is provided with a second buckle (520). The pressure cap (300) can cover the top opening of the mounting base (110) from top to bottom in the height direction of the mounting base (110) and make the second buckle (520) and the first buckle (510) fastened together. The pressure cap (300) can also squeeze the ultrasonic transducer (200) into the mounting base (110). The first buckle (510) includes two baffles (511) spaced apart. The two baffles (511) are higher than the top opening of the mounting base (110). The two baffles (511) have a protruding latch (512) on the side away from the mounting base (110). The latch (512) is fastened to the second buckle (520). A cable receiving cavity (513) is formed between the two baffles (511) for accommodating the cable (220) electrically connected to the ultrasonic transducer (200). The measuring tube (100) is provided with a wire passage hole (130) communicating with the cable receiving cavity (513), and the wire passage hole (130) is used for the cable (220) to pass through.

2. The ultrasonic measuring structure according to claim 1, characterized in that, The elastic seal (400) can also be elastically supported between the ultrasonic transducer (200) and the gland (300).

3. The ultrasonic measuring structure according to claim 1 or 2, characterized in that, In the height direction of the mounting base (110), there is a mounting gap (350) between the gland (300) and the mounting base (110) for the elastic seal (400) to compress and deform.

4. The ultrasonic measuring structure according to claim 3, characterized in that, One of the first buckle (510) and the second buckle (520) is a buckle hole, and the other is a buckle part. The buckle part extends into the buckle hole, and the thickness of the portion of the buckle part extending into the buckle hole is less than the height of the buckle hole.

5. The ultrasonic measuring structure according to claim 1 or 2, characterized in that, The cover (300) includes a top wall (310) and a side wall (320). A portion of the ultrasonic transducer (200) extends into the space enclosed by the top wall (310) and the side wall (320). A buckle (330) extending toward the measuring tube (100) is provided on the side wall (320). The second buckle (520) is provided on the buckle (330).

6. The ultrasonic measuring structure according to claim 5, characterized in that, There is an installation gap (350) between the lower edge of the cover sidewall (320) and the top opening of the mounting base (110).

7. The ultrasonic measuring structure according to claim 5, characterized in that, A portion of the cover sidewall (320) protrudes outward to form a protrusion (321) and forms an extension space (322) on the inside. The buckle (330) extends from the protrusion (321) toward the measuring tube (100), and the first buckle (510) extends into the extension space (322).

8. The ultrasonic measuring structure according to claim 7, characterized in that, The cable receiving cavity (513) is connected to the extended space (322) and is used to receive the cable (220) electrically connected to the ultrasonic transducer (200).

9. The ultrasonic measuring structure according to claim 1, characterized in that, Of the two baffles (511), one of the baffles (511) is provided with a limiting baffle (514) extending in the direction of the other baffle (511). A gap is left between the limiting baffle (514) and the other baffle (511) for the cable (220) to enter the cable receiving cavity (513). The limiting baffle (514) is used to restrict the cable (220) from leaving the cable receiving cavity (513).

10. The ultrasonic measuring structure according to claim 1, characterized in that, The measuring tube (100) has mounting grooves (120) on its opposite sides. The ultrasonic measuring structure also includes a measuring circuit board, which is disposed in the mounting groove (120). The mounting groove (120) has a through hole (130) on its side wall corresponding to the cable receiving cavity (513), so that the cable (220) can extend into the mounting groove (120) through the through hole (130) and be electrically connected to the measuring circuit board.

11. The ultrasonic measuring structure according to claim 1, characterized in that, The outer periphery of the ultrasonic transducer (200) has an annular protrusion (210). The pressure cap (300) has a protruding abutment (340) at a position corresponding to the annular protrusion (210). The pressure cap (300) presses the annular protrusion (210) through the abutment (340) to press the ultrasonic transducer (200) into the mounting base (110). The abutment (340) has a clearance opening for the cable electrically connected to the ultrasonic transducer (200) to pass through.

12. The ultrasonic measuring structure according to claim 11, characterized in that, A wiring gap (360) is provided between the top wall (310) of the cover (300) and the top of the ultrasonic transducer (200) to accommodate the cable (220) electrically connected to the ultrasonic transducer (200).

13. The ultrasonic measuring structure according to claim 11, characterized in that, The inner wall of the mounting base (110) is provided with a stepped surface (111), and the elastic seal (400) is elastically supported between the annular protrusion (210) and the stepped surface (111); and / or The elastic seal (400) is elastically supported between the abutment portion (340) and the annular protrusion (210).

14. The ultrasonic measuring structure according to claim 13, characterized in that, The elastic seal (400) has a C-shaped cross-section and includes an integrally formed first sealing section (410), a second sealing section (420), and a third sealing section (430). The first sealing section (410) is elastically supported between the inner wall of the mounting base (110) and the outer wall of the annular protrusion (210). The second sealing section (420) is elastically supported between the side of the annular protrusion (210) facing the measuring tube (100) and the stepped surface (111). The third sealing section (430) is elastically supported between the abutment (340) and the annular protrusion (210).

15. The ultrasonic measuring structure according to claim 14, characterized in that, The outer side of the first sealing section (410) is provided with a first convex structure (411), and the first sealing section (410) abuts against the inner wall of the mounting base (110) through the first convex structure (411); and / or The second sealing section (420) has a second convex structure (421) on the side facing the stepped surface (111), and the second sealing section (420) abuts against the stepped surface (111) through the second convex structure (421); and / or The third sealing section (430) is provided with a third convex structure (431), and the third sealing section (430) abuts against the abutting part (340) through the third convex structure (431).

16. The ultrasonic measuring structure according to claim 10, characterized in that, The ultrasonic measurement structure also includes: Mounting cover (600), on which a third buckle (610) is provided, and on the inner sidewall of mounting groove (120) a fourth buckle (121) is provided, wherein the third buckle (610) and the fourth buckle (121) are fastened together.

17. The ultrasonic measuring structure according to claim 16, characterized in that, The inner surface of the mounting cover (600) is provided with a limiting rib (620), and the groove of the mounting groove (120) is provided with a limiting countersunk platform (123) communicating with the mounting groove (120). The limiting rib (620) extends into the limiting countersunk platform (123), and the third buckle (610) is provided on the side of the limiting rib (620) away from the middle of the mounting cover (600); and / or The mounting groove (120) is also provided with a circuit board slot (122) on the side wall of the groove, and the edge of the measuring circuit board is locked in the circuit board slot (122).

18. The ultrasonic measuring structure according to claim 1, characterized in that, The measuring tube (100) has independent measuring channels (101) and non-measuring channels (102). The inner cavity (112) of the mounting base (110) is connected to the measuring channel (101) so that the ultrasonic transducer (200) transmits ultrasonic waves only through the measuring channel (101), or the inner cavity (112) of the mounting base (110) is connected to both the measuring channel (101) and the non-measuring channel (102).

19. The ultrasonic measuring structure according to claim 18, characterized in that, The number of the measuring channel (101) is one, and the number of the non-measuring channels (102) is at least two, with at least two non-measuring channels (102) distributed on opposite sides of the measuring channel (101).

20. The ultrasonic measuring structure according to claim 18, characterized in that, The cross-section of the measuring channel (101) is rectangular, and the cross-section of the non-measuring channel (102) is circular, racetrack-shaped, elliptical, or rectangular; and / or Multiple channels are provided on the measuring tube (100) and extend through the measuring tube (100) along the length direction of the measuring tube (100). The multiple channels are configured as the measuring flow channel (101) and the non-measuring flow channel (102).

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