Ultrasonic transducer assembly, assembly structure and flow meter

Abstract

The utility model provides an ultrasonic transducer assembly, an assembly structure and a flowmeter, and relates to the technical field of ultrasonic sensors. The assembly structure comprises a flexible sleeve which is sleeved on the ultrasonic transducer, the inner wall of the flexible sleeve is tightly matched with the ultrasonic transducer, and the outer wall of the flexible sleeve is divided into a contact part and a non-contact part; the mounting piece is provided with a mounting hole; wherein the ultrasonic transducer and the flexible sleeve are jointly arranged in the mounting hole, the flexible sleeve is located between the inner wall of the mounting hole and the ultrasonic transducer, the contact part is in contact connection with the inner wall of the mounting hole, and a gap is formed between the non-contact part and the inner wall of the mounting hole. The ultrasonic transducer has the beneficial effects that the ultrasonic transducer is positioned through the contact connection of the contact part and the mounting hole, and meanwhile, the non-contact part is separated from the mounting hole to form a gap, so that the resonance problem of the ultrasonic transducer is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic sensors, in particular to an ultrasonic transducer assembly, an assembly structure and a flowmeter. Background Art

[0002] In recent years, ultrasonic sensors have attracted great attention at home and abroad due to their advantages of non-contact measurement, no moving parts, no pressure loss, extremely high measurement accuracy and the ability to combine more intelligent applications. They are a hot topic in the development of the gas metering field in recent years. The ultrasonic transducer is a key sensing element in an ultrasonic gas meter, and the accuracy and reliability of its installation are crucial for the measurement performance and stability of the ultrasonic sensor.

[0003] Please refer to Figure 12 , in the prior art, a Chinese patent with the publication number CN213688510U discloses a sensor assembly for an ultrasonic gas meter, including a matching layer 100 and an acoustic absorption layer 200. The acoustic absorption layer 200 is configured as a rubber sleeve as an installation and fixation layer. The acoustic absorption layer 200 is sleeved outside the matching layer 100 in a socketing manner. This kind of sensor for ultrasonic gas meters is applied to ultrasonic flowmeters such as gas sensors. The acoustic absorption layer 200 is installed in the installation hole by an interference fit method. The sensor for ultrasonic gas meters is in contact connection with the installation hole through the acoustic absorption layer 200 (rubber sleeve).

[0004] Currently, most ultrasonic transducers of ultrasonic flowmeters adopt the structure and installation method of the sensor for ultrasonic gas meters in Chinese Patent 213688510U. The applicant found in the actual application of ultrasonic flowmeters that although this installation method can meet the requirements of positioning, stable installation and sealing of the ultrasonic transducer, since the ultrasonic transducer is directly in contact connection with the installation hole through the rubber sleeve, and based on the operation of the ultrasonic flowmeter, the ultrasonic transducer needs to generate ultrasonic waves through mechanical vibration, this connection method will cause the installation hole to vibrate through the rubber sleeve. After the vibration then returns from the installation hole through the rubber sleeve to the matching layer, it will form noise, thereby affecting the accuracy during ultrasonic measurement. Summary of the Utility Model

[0005] In view of this, in order to solve the noise problem caused by the installation of the ultrasonic transducer in the ultrasonic sensor, embodiments of the present utility model provide an assembly structure, an ultrasonic flowmeter, and an ultrasonic transducer assembly.

[0006] An embodiment of the present utility model provides an assembly structure for assembling an ultrasonic transducer, including: a flexible sleeve sleeved on the ultrasonic transducer, and the inner wall thereof is in close fit with the ultrasonic transducer, and the circumferential outer wall surface thereof is divided into a contact portion and a non-contact portion; and a mounting member provided with a mounting hole; wherein, the ultrasonic transducer and the flexible sleeve are jointly disposed in the mounting hole, the flexible sleeve is located between the inner wall of the mounting hole and the ultrasonic transducer, the contact portion is in contact connection with the inner wall of the mounting hole, and there is a gap between the non-contact portion and the inner wall of the mounting hole.

[0007] An embodiment of the present utility model also provides an ultrasonic transducer assembly, including the above-mentioned assembly structure, the contact portion is configured to be in contact connection with the inner wall of the mounting hole for mounting the ultrasonic transducer assembly, and the non-contact portion is configured to have a gap with the inner wall of the mounting hole.

[0008] An embodiment of the present utility model also provides an ultrasonic flowmeter, including: a flowmeter housing and the above-mentioned ultrasonic transducer assembly, the ultrasonic transducer is mounted on the flowmeter housing through the assembly structure; the mounting member is integrally provided with the flowmeter housing.

[0009] The beneficial effects brought by the technical solution provided by the embodiment of the present utility model are:

[0010] By providing a contact portion on the flexible sleeve to be in contact connection with the mounting hole, the positioning of the ultrasonic transducer is realized, and at the same time, the non-contact portion on the flexible sleeve is separated from the mounting hole to form a gap. In this way, when the ultrasonic transducer vibrates, the vibration degree transmitted from the ultrasonic transducer to the mounting member through the flexible sleeve is weakened through the gap formed by the separation of the non-contact portion from the mounting hole, thereby optimizing the noise problem generated by the ultrasonic transducer due to the foregoing reasons and improving the detection accuracy of the ultrasonic flowmeter. Description of the Drawings

[0011] Figure 1 is a cross-sectional view of an embodiment of an assembly structure of the present utility model;

[0012] Figure 2 is Figure 1 a schematic diagram of the ultrasonic transducer and the flexible sleeve in

[0013] Figure 3 is Figure 1 a schematic diagram of the mounting member in

[0014] Figure 4 is a cross-sectional view of another embodiment of an assembly structure of the present utility model;

[0015] Figure 5 is Figure 4 a schematic diagram of the ultrasonic transducer and the flexible sleeve in

[0016] Figure 6 is Figure 4 a schematic view of the mounting member in

[0017] Figure 7 is a cross-sectional view of another embodiment of an assembly structure of the present utility model;

[0018] Figure 8 is Figure 7 a schematic view of the ultrasonic transducer and the flexible sleeve in

[0019] Figure 9 is Figure 7 a schematic view of the mounting member in

[0020] Figure 10 is a schematic view of an embodiment of the gland

[0021] Figure 11 is a schematic view of another embodiment of the gland

[0022] Figure 12 is a schematic view of an ultrasonic transducer in the prior art.

[0023] In the figure: 1, ultrasonic transducer; 101, lead wire; 2, flexible sleeve; 201, contact portion; 201a, rib; 201b, flange; 201c, enlarged ring; 202 / 202a / 202b / 202c non-contact portion; 3, mounting member; 301, mounting hole; 302a, strip-shaped groove; 302b, fitting groove; 302c, stepped opening; 303, sub-button; 304, radial boss; 4, gland; 401, annular cover body; 402, pressing ring; 403, mother button; 404, connecting ear. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will further describe the embodiments of the present utility model with reference to the accompanying drawings. The following describes a relatively better one among multiple possible embodiments of the present utility model, aiming to provide a basic understanding of the present utility model, but not aiming to identify the key or decisive elements of the present utility model or limit the scope to be protected.

[0025] In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0026] For technologies, methods and devices known to those of ordinary skill in the relevant art, they may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the description.

[0027] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures. At the same time, it should be understood that, for the sake of description, the dimensions of the various parts shown in the figures are not drawn in actual proportional relationship.

[0028] Furthermore, it should be noted that, unless otherwise clearly specified and defined, the terms "install" and "connect" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiment 1

[0030] Please refer to Figures 1 to 9 , Embodiment 1 of the present invention provides an assembly structure for installing an ultrasonic transducer on various ultrasonic devices applied to the ultrasonic transducer 1, and the ultrasonic devices include but are not limited to ultrasonic sensors for detecting various gas flows.

[0031] One end of the ultrasonic transducer 1 is provided with a lead 101 for power supply and signal transmission, and the other end is a working end for contacting the gas. The ultrasonic transducer 1 is mainly made of piezoelectric ceramics using the piezoelectric effect, and its internal structure is the prior art and will not be described in detail herein.

[0032] This assembly structure mainly includes a flexible sleeve 2 and a mounting member 3. The flexible sleeve 2 is sleeved on the ultrasonic transducer 1, and its inner wall is in close fit with the ultrasonic transducer 1. The outer wall surface of the flexible sleeve 2 is divided into a contact portion 201 and a non-contact portion 202. The mounting member 3 is provided with a mounting hole 301; wherein, the ultrasonic transducer 1 and the flexible sleeve 2 are jointly arranged in the mounting hole 301, the flexible sleeve 2 is located between the inner wall of the mounting hole 301 and the ultrasonic transducer 1, the contact portion 201 is in contact connection with the inner wall of the mounting hole 301, and there is a gap between the non-contact portion 202 and the inner wall of the mounting hole 301.

[0033] The contact part 201 is in direct contact and connection with the mounting hole 301 to mount and position the ultrasonic transducer 1. Among them, in one example, the mating mode between the contact part 201 and the mounting hole 301 can be an interference fit. The outer wall of the non-contact part 202 is separated from the mounting hole 301, that is, there is a clearance fit between the non-contact part 202 and the inner wall of the mounting hole 301 to form a gap. The vibration degree of the ultrasonic transducer 1 transmitted to the mounting part 3 through the flexible sleeve 2 is weakened through the gap formed by the separation of the non-contact part 202 and the mounting hole 301, so as to optimize the noise problem of the ultrasonic transducer 1 and improve the detection accuracy of the ultrasonic flowmeter.

[0034] In addition, in the prior art, if the ultrasonic flowmeter is in a high-temperature environment, the heat expansion of the flexible sleeve in the prior art will further exacerbate the aforementioned noise problem. The gap in the solution of the present application can also provide an expansion space for the heat expansion of the flexible sleeve 2 in a high-temperature environment to weaken the noise problem.

[0035] In the prior art, if the ultrasonic flowmeter is in a low-temperature environment, the flexible sleeve in the prior art is cold-hardened, resulting in hard contact between the ultrasonic transducer and the flexible sleeve, and hard contact between the flexible sleeve and the mounting part, which will further exacerbate the aforementioned noise problem. The gap in the solution of the present application can effectively weaken the noise problem exacerbated by the cold hardening of the flexible sleeve in the prior art.

[0036] The flexible sleeve 2 is sleeved on the ultrasonic transducer 1, specifically on the end where the lead 101 of the ultrasonic transducer 1 is led out.

[0037] Such as Figure 1 、 4 Or as shown in FIG. 7, in some embodiments, the flexible sleeve 2 is arranged at the end of the ultrasonic transducer 1 and is in close contact with the end surface of the ultrasonic transducer 1.

[0038] In some embodiments, the flexible sleeve 2 is made of an elastic material and can produce adaptive deformation. The flexible sleeve 2 can generally be selected as a rubber sleeve, which is generally injection-molded integrally from rubber material. The circumferential wall surface of the flexible sleeve 2 forms the contact part 201 and the non-contact part 202. It can be understood that the material of the flexible sleeve 2 can also be flexibly selected as other elastic materials according to the actual application scenario.

[0039] The shape of the mounting hole 301 is set according to the external shape of the ultrasonic transducer 1. Such as Figure 3 、 6 Or as shown in FIG. 9, in some embodiments, the mounting hole 301 is a stepped hole. The ultrasonic transducer 1 is mounted in the mounting hole 301 through the contact part 201, and the non-contact part 202 is in clearance fit with the mounting hole 301.

[0040] In some embodiments, the ultrasonic transducer 1 has a virtual central axis and a circumferential direction around the central axis. The contact portion 201 and at least a part of the non-contact portion 201 are arranged in sequence along the circumferential direction. Since the flexible sleeve 2 expands mainly radially when heated, such an arrangement can provide expansion space for the flexible sleeve 2 in certain radial directions for the aforementioned gap, so as to optimize the noise problem that is exacerbated by thermal expansion in the prior art.

[0041] In some embodiments, the contact portion 201 is a protruding portion that protrudes radially from the outer wall of the flexible sleeve 2 along the ultrasonic transducer 1. An engaging portion that cooperates with the protruding portion is provided on the inner wall of the mounting hole 301, and the protruding portion is embedded in the engaging portion. The protruding portion and the engaging portion are connected to realize the installation of the contact portion 201 and the mounting hole 301, thereby realizing the installation of the ultrasonic transducer 1. Moreover, the protruding portion being embedded in the engaging portion can also prevent the ultrasonic transducer 1 from rotating relative to the mounting hole 301.

[0042] In addition, in some embodiments, the engaging portion may not be provided, and the ultrasonic transducer 1 can be installed only by the contact between the protruding portion and the inner wall of the mounting hole 301.

[0043] It should be noted that the outer shape of the ultrasonic transducer 1 can be flexibly set according to the actual application scenario, and the shape of the mounting hole 301 is set according to the shape of the ultrasonic transducer 1.

[0044] In some embodiments, as Figure 1 shown in FIG. 3 or FIG. 4, the ultrasonic transducer 1 is in the shape of a stepped shaft. At this time, the central axis of the ultrasonic transducer 1 is the axis of the ultrasonic transducer 1.

[0045] In some embodiments, when the ultrasonic transducer is in other shapes such as a cube, the central axis of the ultrasonic transducer is the center line of the ultrasonic transducer.

[0046] In some embodiments, the number of the protruding portions is set to be multiple. The number of the corresponding engaging portions is also set to be multiple and is the same as the number of the protruding portions. As Figure 2 shown in FIG. 5, the number of the protruding portions can be set to three. Each protruding portion is embedded in one engaging portion, so that the stable installation of the ultrasonic transducer 1 can be realized.

[0047] In some embodiments, the multiple protruding portions are arranged in sequence along the circumferential direction; the number of the non-contact portions 202 is multiple; at least a part of one non-contact portion 202 is arranged between two adjacent protruding portions 201, so as to optimize the noise problem that is exacerbated by thermal expansion in the prior art.

[0048] In some embodiments, the protrusions are evenly distributed around the virtual central axis of the ultrasonic transducer 1. Since the protrusions are evenly distributed, the ultrasonic transducer 1 is connected to the mounting hole 301 through a plurality of uniform protrusions, enabling more accurate positioning. Moreover, the non-contact portion 202 is evenly separated by the protrusions, such that when the non-contact portion 202 deforms on the outer wall of the ultrasonic transducer 1, a relatively uniform deformation is generated, preventing excessive deformation at some positions of the non-contact portion 202 due to uneven force and reducing the possibility of contact between the non-contact portion 202 and the mounting hole 301.

[0049] Please refer to Figure 1 、 Figure 2 and Figure 3 , in some embodiments, the protrusion is a rib 201a that extends along the central axis of the ultrasonic transducer 1. The fitting portion includes a plurality of strip-shaped grooves 302a that are recessed relative to the inner wall of the mounting hole 301, and each rib 201a is inserted into a strip-shaped groove 302a.

[0050] It should be noted that the shape of the strip-shaped groove 302a is adapted to the shape of the rib 201a, and their positions correspond one by one. Through the one-to-one fitting connection between the rib 201a and its corresponding strip-shaped groove 302a, the connection between the flexible sleeve 2 and the mounting hole 301 is realized, the installation and positioning of the ultrasonic transducer 1 are achieved, and an annular gap is formed between the non-contact portion 202a of the flexible sleeve 2 and the mounting hole 301.

[0051] Correspondingly, in other embodiments, only the rib 201a may be provided without the strip-shaped groove 302a.

[0052] In some embodiments, the length of the rib 201a in the extending direction of the mounting hole 301 is greater than or equal to 3 mm, and the length of the strip-shaped groove 302a in the extending direction of the mounting hole 301 matches the length of the rib 201a in the extending direction of the mounting hole 301. The rib 201a and the strip-shaped groove 302a are in interference fit, so that each rib 201a and each strip-shaped groove 302a can be firmly fitted and connected one by one. By making the length of the rib 201a in the extending direction of the mounting hole 301 greater than or equal to 3 mm, the stability of the connection between the flexible sleeve 2 and the mounting member 3 can be ensured, and the size of the rib 201a in the circumferential direction can be made smaller, which is beneficial to optimizing the noise problem that is aggravated by thermal expansion in the prior art.

[0053] In some embodiments, the rib 201a is a semi-cylindrical shape with a crescent cross-section. Correspondingly, the cross-sectional shape of the strip-shaped groove 302a is also crescent-shaped, so that the rib 201a is not easily detached after being inserted into the strip-shaped groove 302a, and the fitting is more secure. It can be understood that the rib 201a can also be flexibly set to other shapes according to the actual application scenario, as long as the shapes of the rib 201a and the strip-shaped groove 302a are adapted to each other and can be firmly fitted.

[0054] Please refer to Figure 4 、 Figure 5 and Figure 6 , in some other embodiments, the protruding portion is a convex edge 201b, and the convex edges 201b are arranged at intervals on the upper edge of the ultrasonic transducer 1 and protrude outward. The fitting portion includes a plurality of radial bosses 304 arranged in the mounting hole, and a fitting groove 302b is formed between two adjacent radial bosses 304. Each convex edge 201b is inserted into a fitting groove 302b.

[0055] The shape of the fitting groove 302b is adapted to the shape of the convex edge 201b, and the positions correspond one by one. Through the one-to-one fitting connection between the convex edge 201b and its corresponding fitting groove 302b, the connection between the flexible sleeve 2 and the mounting hole 301 is realized, and an annular gap is formed between the non-contact portion 202b of the flexible sleeve 2 and the mounting hole 301.

[0056] The convex edge 201b is block-shaped, the convex edge 201b protrudes relative to the side wall of the ultrasonic transducer 1, and the upper surface of the convex edge 201b is flush with the upper surface of the ultrasonic transducer 1. The radial bosses 304 are arranged on the stepped end surface in the mounting hole 301. The radial bosses 304 protrude towards the axis direction of the mounting hole 301 relative to the inner wall of the mounting hole 301. A fitting groove 302b is formed between two adjacent radial bosses 304, which can just make a convex edge 201b inserted into a fitting groove 302b, and the two are in interference fit and firmly connected.

[0057] Although the convex edge 201b is set as block-shaped here, it can be understood that the convex edge 201b can also be flexibly set to other shapes according to the actual application scenario, as long as the shapes of the convex edge 201b and the fitting groove 302b are adapted to each other and can be firmly fitted.

[0058] In addition, please refer to Figure 7 、 Figure 8 and Figure 9, in some other embodiments, the contact portion 201 includes an enlarged ring 201c surrounding the upper edge of the ultrasonic transducer 1. A stepped opening 302c is provided at the upper end of the mounting hole 301, and the enlarged ring 201c is embedded in the stepped opening 302c. The enlarged ring 201c surrounds the upper edge of the ultrasonic transducer 1 in a circle and protrudes outward relative to the upper edge of the ultrasonic transducer 1, so that the upper end of the flexible sleeve 2 just forms a disc shape. The enlarged ring is connected to the stepped opening to realize the connection between the contact portion 201 and the mounting hole 301.

[0059] The shape of the stepped opening 302c is adapted to the shape of the enlarged ring 201c, so that the enlarged ring 201c can just be embedded in the stepped opening 302c. Here, the inner diameter of the upper port of the mounting hole 301 is relatively enlarged to form the stepped opening 302c, and the inner diameter of the stepped opening 302c is approximately the same as the outer diameter of the enlarged ring 201c, so that the enlarged ring 201c can just be embedded in the stepped opening 302c.

[0060] Although the enlarged ring 201c is circular here, it can be understood that the enlarged ring 201c can also be flexibly set to other shapes according to the actual application scenario, as long as the shapes of the enlarged ring 201c and the stepped opening 302c are adapted to each other and can be firmly fitted.

[0061] In some embodiments, the unilateral gap between the non-contact portion 202 and the mounting hole 301 is 0.05 - 0.15 mm. The (unilateral) gap between the non-contact portion 202 and the mounting hole 301 is greater than or equal to 0.05 mm, which can effectively optimize the noise problem aggravated by thermal expansion in the prior art; the (unilateral) gap between the non-contact portion 202 and the mounting hole 301 is less than or equal to 0.15 mm, which is convenient for subsequent sealing to avoid air leakage at the gap.

[0062] Please refer to Figure 1 、 Figure 4 and Figure 7 , in some embodiments, the assembly structure further includes a gland 4. The mounting hole 301 is a through hole, and the gland 4 is connected to the upper end of the mounting member 3 to press the flexible sleeve 2. Considering that after the ultrasonic transducer 1 is assembled into the mounting hole 301, in order to achieve fixation and sealing, generally the gland 4 is arranged at the upper end of the mounting hole 301, and the flexible sleeve 2 is pressed by the gland 4, so as to press and fix the ultrasonic transducer 1.

[0063] It should be noted that the gland 4 presses the upper end surface of the flexible sleeve 2, so that the contact part between the gland and the flexible sleeve 2 is offset from the ultrasonic transducer 1 on the central axis. In this way, the flexible sleeve 2 can also generate a certain deformation on the central axis of the ultrasonic transducer 1 to adapt to the deformation of the central axis of the ultrasonic transducer 1, so as to absorb sound and reduce vibration through a larger deformation, and further reduce the extrusion stress on the ultrasonic transducer 1 to avoid the resonance phenomenon again.

[0064] Please refer to Figure 1 and Figure 10 , the gland 4 includes an annular cover body 401 and a pressing ring 402 arranged at the bottom of the annular cover body 401. The annular cover body 401 is hollow and fixedly connected to the upper part of the mounting member 3. The inner diameter of the pressing ring 402 is larger than the maximum outer diameter of the ultrasonic transducer 1. In this way, when the pressing ring 402 presses the flexible sleeve 2, it is exactly located outside the ultrasonic transducer 1 and does not directly press the end of the ultrasonic transducer 1 through the flexible sleeve 2.

[0065] As Figure 4 or shown in FIG. 7, in some embodiments, the gland 4 presses the contact part 201. That is, the pressing ring 402 exactly presses the upper surface of each convex edge 201b or the upper surface of the enlarged ring 201c, so that the contact part between the pressing ring 402 and the flexible sleeve 2 is offset from the ultrasonic transducer 1 on the central axis, avoiding restricting the deformation of the central axis of the flexible sleeve 2.

[0066] As Figure 1 shown, in some embodiments, the gland 4 presses the part where the non-contact part 202 fits with the side wall of the ultrasonic transducer 1. That is, the pressing ring 402 exactly presses the part of the non-contact part 202a located between the convex strip 201a and the side wall of the ultrasonic transducer 1, and can also make the contact part between the pressing ring 402 and the flexible sleeve 2 offset from the ultrasonic transducer 1 on the central axis, avoiding restricting the deformation of the central axis of the flexible sleeve 2.

[0067] Please refer to Figure 10 , in some embodiments, the gland 4 and the mounting member 3 are connected by snap connection. Specifically, a plurality of female buttons 403 extending downward are provided at the edge of the annular cover body 401, and a plurality of male buttons 303 are provided on the outer wall of the upper part of the mounting member 3. When the annular cover body 401 covers the upper port of the mounting hole 301, each female button 403 is clamped with a male button 303, so as to realize the connection between the gland 4 and the mounting member 3.

[0068] Please refer to Figure 11, in some other embodiments, the gland 4 is connected to the mounting member 3 by bolts. Specifically, a plurality of outwardly protruding connecting lugs 404 are provided at the edge of the annular cover body 401, and a plurality of connecting seats are provided at the upper end of the mounting member 3. When the annular cover body 401 covers the upper port of the mounting hole 301, each connecting lug 404 is supported on a connecting seat, and the connecting lug 404 and the connecting seat are connected by bolts.

[0069] Although the gland 4 is used to compress the flexible sleeve 2 in the present application, it can be understood that the gland 4 can still be flexibly set into various compression structures according to the actual application scenario. And the gland 4 can also be connected to the mounting member 3 by other various means such as a pin shaft.

[0070] Embodiment 2

[0071] Embodiment 2 of the present invention provides an ultrasonic transducer assembly, including the assembly structure in Embodiment 1; the contact portion 201 is configured to be in contact connection with the inner wall of the mounting hole 301 for mounting the ultrasonic transducer assembly, and the non-contact portion 202 is configured to have a gap with the inner wall of the mounting hole 301.

[0072] Since the ultrasonic transducer assembly provided in Embodiment 2 of the present invention includes the assembly structure in Embodiment 1, it has the same technical effects as those after the ultrasonic transducer 1 in Embodiment 1 is assembled, which will not be elaborated here.

[0073] Embodiment 3

[0074] Embodiment 3 of the present invention further provides an ultrasonic flowmeter, that is, applying the assembly structure in Embodiment 1 to the ultrasonic flowmeter. Specifically, the ultrasonic flowmeter includes a flowmeter housing and the ultrasonic transducer assembly, and the ultrasonic transducer 1 is mounted on the flowmeter housing through the assembly structure.

[0075] It should be noted that generally, the ultrasonic flowmeter measures the fluid flow rate by using the change in the propagation speed caused by the flow rate of the measured fluid when ultrasonic waves pass through the fluid medium, and two ultrasonic transducers 1 are required for ultrasonic wave transmission and reception. Therefore, at least one of the ultrasonic transducers 1 in the ultrasonic flowmeter is mounted on the flowmeter housing through the assembly structure.

[0076] In some embodiments, the mounting member is integrally provided with the flowmeter housing. It can be understood that directly integrating the mounting member 3 of the assembly structure with the flowmeter housing, that is, using the flowmeter housing or a part thereof as the mounting member 3, and directly providing mounting holes 301 on the flowmeter housing or a part thereof, which cooperate with the ultrasonic transducer 1 and the flexible sleeve 2 to form the assembly structure. In some other embodiments, the assembly structure can also be used as an integral module and directly mounted on the flowmeter housing.

[0077] When the ultrasonic flowmeter uses the assembly structure to mount the ultrasonic transducer 1, during the operation of the ultrasonic flowmeter, the ultrasonic transducer 1 is only in contact connection with the mounting hole 301 through the contact portion 201 of the flexible sleeve 2, and there is a gap between the non-contact portion 202 of the ultrasonic transducer 1 and the flexible sleeve 2 and the mounting hole 301, avoiding the hard contact between the ultrasonic transducer 1 and the mounting hole 301 caused by the deformation of the flexible sleeve 2 or the mounting hole 301 due to temperature change, thereby avoiding the resonance phenomenon of the ultrasonic transducer 1 and ensuring the measurement accuracy of the ultrasonic flowmeter.

[0078] In this embodiment, the flowmeter can be a gas meter.

[0079] In this article, the orientation words such as front, back, up, and down are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the sake of clarity and convenience in expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different usage and placement methods. The use of the orientation words should not limit the scope of protection requested by this application.

[0080] Without conflict, the above embodiments and the features in the embodiments in this article can be combined with each other. The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An assembly structure for assembling an ultrasonic transducer, characterized in that Comprising: A flexible sleeve sleeved on the ultrasonic transducer, and the inner wall thereof is in close fit with the ultrasonic transducer, and its circumferential wall surface is divided into a contact portion and a non-contact portion; And a mounting member provided with a mounting hole; wherein, the ultrasonic transducer and the flexible sleeve are jointly disposed in the mounting hole, the flexible sleeve is located between the inner wall of the mounting hole and the ultrasonic transducer, the contact portion is in contact connection with the inner wall of the mounting hole, and there is a gap between the non-contact portion and the inner wall of the mounting hole.

2. The assembly structure according to claim 1, wherein: The ultrasonic transducer has a virtual central axis and a circumferential direction around the central axis; the contact portion and at least part of the non-contact portion are sequentially arranged along the circumferential direction.

3. The assembly structure according to claim 2, characterized in that: The contact portion is a convex portion protruding radially from the outer wall of the flexible sleeve along the ultrasonic transducer; the inner wall of the mounting hole is provided with a fitting portion cooperating with the convex portion; the convex portion is embedded in the fitting portion.

4. The assembly structure according to claim 3, characterized in that: The number of the convex portions is multiple; the number of the fitting portions is the same as the number of the convex portions, and the fitting portions and the convex portions are arranged in one-to-one correspondence; the multiple convex portions are sequentially arranged along the circumferential direction; the number of the non-contact portions is multiple; at least part of one non-contact portion is arranged between two adjacent convex portions.

5. The assembly structure according to claim 4, characterized in that: Each of the convex portions is uniformly distributed along the circumferential direction.

6. The assembly structure according to claim 3, wherein: The convex portion is a convex strip extending along the central axis of the ultrasonic transducer; the fitting portion is a strip-shaped groove recessed relative to the inner wall of the mounting hole, and each convex strip is embedded in one strip-shaped groove.

7. The assembly structure according to any one of claims 3-6, characterized in that: The length of the convex portion on the central axis of the ultrasonic transducer is greater than or equal to 3 mm, and the length of the fitting portion on the central axis of the ultrasonic transducer matches the length of the convex portion in the extending direction of the mounting hole.

8. The assembly structure according to any one of claims 3-6, characterized in that: The convex portion is a semi-cylindrical body with a crescent-shaped cross section.

9. The assembly structure according to claim 3 or 4, characterized in that: The convex portion is a convex edge, and the convex edges are spaced apart from each other and protrude outwardly along the upper edge of the ultrasonic transducer; the fitting portion includes a plurality of radial bosses disposed in the mounting hole, and a fitting groove is formed between two adjacent radial bosses, and each convex edge is embedded in one fitting groove.

10. The assembly structure according to claim 1, wherein: The contact portion includes an enlarged ring surrounding the edge of the ultrasonic transducer; the contact portion and the non-contact portion are sequentially arranged along the extending direction of the mounting hole.

11. The assembly structure according to claim 1, characterized in that: The unilateral gap between the non-contact portion and the mounting hole is 0.05 - 0.15 mm.

12. The assembly structure according to claim 1, characterized in that: Further comprising a gland, the mounting hole is a through hole, and the gland is connected to the upper end of the mounting member to press the flexible sleeve tightly; The gland presses the upper end surface of the flexible sleeve, and the contact portion of the gland and the flexible sleeve is offset from the ultrasonic transducer on the central axis; The gland presses the contact portion, or the gland presses the portion where the non-contact portion is in contact with the side wall of the ultrasonic transducer.

13. An ultrasonic transducer assembly, characterized in that, Comprising the assembly structure according to any one of claims 1 to 12, the contact portion is configured to be in contact connection with the inner wall of the mounting hole for mounting the ultrasonic transducer assembly, and the non-contact portion is configured to have a gap with the inner wall of the mounting hole.

14. An ultrasonic flowmeter, characterized in that, Comprising: A flowmeter housing and an ultrasonic transducer assembly as claimed in claim 13, wherein the ultrasonic transducer is mounted on the flowmeter housing through the assembly structure; The mounting member is integrally provided with the flowmeter housing.

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