Ultrasonic transducer and ultrasonic flowmeter

Abstract

The utility model provides an ultrasonic transducer and an ultrasonic flowmeter, and relates to the technical field of flowmeters. The ultrasonic transducer comprises a shell, a transducer core body, a connecting seat and a tail pipe. Wherein the shell is provided with a mounting cavity, the transducer core body is inserted into the mounting cavity, one end of the transducer core body is in coupling connection with the bottom wall of the mounting cavity through a coupling agent, the coupling agent is oil, the outer circumferential wall of the transducer core body is in clearance fit with the inner circumferential wall of the mounting cavity, and the gap between the transducer core body and the inner wall of the mounting cavity is filled with sealing oil; the other end of the transducer core body is connected with one end of the connecting base, the other end of the connecting base is connected with the tail pipe, the tail pipe is further detachably connected with the shell, and the tail pipe can drive the connecting base to move towards the end away from or close to the transducer core body so as to adjust the thickness of an oil coupling layer between the transducer core body and the bottom wall of the installation cavity. Compared with the prior art, the ultrasonic transducer can ensure the sound transmission efficiency and is high in stability.

Description

Technical Field

[0001] The present application relates to the technical field of flow meters, and in particular to an ultrasonic transducer and an ultrasonic flow meter. Background Art

[0002] Currently, as the core component of an ultrasonic flow meter, the performance, quality, etc. of an ultrasonic transducer all affect the measurement accuracy of the ultrasonic flow meter.

[0003] In the existing coupling method between the transducer core and the metal shell of an ultrasonic transducer, under the use conditions of high pressure and high temperature, irreversible performance degradation is likely to occur, thereby affecting the sound transmission efficiency and stability of the ultrasonic transducer, and further affecting the measurement accuracy of the ultrasonic flow meter. Summary of the Utility Model

[0004] Embodiments of the present application provide an ultrasonic transducer and an ultrasonic flow meter to solve the problems of low sound transmission efficiency and poor stability of the existing ultrasonic transducer.

[0005] Embodiments of the present application provide an ultrasonic transducer, including:

[0006] A housing and a transducer core body. The housing is provided with an installation cavity, the transducer core body is inserted into the installation cavity, one end of the transducer core body is coupled and connected to the bottom wall of the installation cavity through a coupling agent, and the coupling agent is oil. The outer peripheral wall of the transducer core body and the inner peripheral wall of the installation cavity are in clearance fit, and the clearance between the transducer core body and the inner wall of the installation cavity is filled with sealing oil;

[0007] A connection seat and a tail pipe. The other end of the transducer core body abuts against one end of the connection seat, the other end of the connection seat abuts against the tail pipe, the tail pipe is also detachably connected to the housing, and the tail pipe can drive the connection seat to move away from or close to one end of the transducer core body to adjust the thickness of the oil coupling layer between the transducer core body and the bottom wall of the installation cavity.

[0008] In a possible implementation manner, the ultrasonic transducer provided by the embodiments of the present application further includes:

[0009] An elastic member. The elastic member is sleeved on the outer periphery of the connection seat. An abutting shoulder is provided on the outer periphery of the connection seat. One end of the elastic member is connected to the abutting shoulder, and the other end of the elastic member is connected to one end of the tail pipe close to the connection seat. The tail pipe can drive the elastic member to be compressed, and the tail pipe can adjust the compression distance of the elastic member to adjust the thickness of the oil coupling layer.

[0010] In a possible implementation manner, for the ultrasonic transducer provided by the embodiments of the present application, an inner peripheral wall of the installation cavity, one end of the tail pipe close to the connection seat, an outer peripheral wall of the connection seat, and the abutting shoulder surround and form a sealing cavity. The elastic member is disposed in the sealing cavity, and the sealing cavity is filled with sealing oil.

[0011] In a possible implementation manner, for the ultrasonic transducer provided by the embodiments of the present application, one end of the tail pipe away from the connection seat is filled with sealing glue, and the sealing glue is used to seal the sealing cavity.

[0012] In a possible implementation manner, for the ultrasonic transducer provided by the embodiments of the present application, an inner thread is provided on an inner wall of the housing, an outer thread matching the inner thread is provided on an outer wall of the tail pipe, the housing is threadedly connected to the tail pipe, and the inner thread of the housing and / or the outer thread of the tail pipe is coated with thread glue.

[0013] In a possible implementation manner, for the ultrasonic transducer provided by the embodiments of the present application, a limiting shoulder is provided on an inner wall of the housing, one end of the tail pipe can abut against the limiting shoulder, and the limiting shoulder is used to limit a moving distance of the tail pipe in a direction towards a bottom wall of the housing.

[0014] In a possible implementation manner, for the ultrasonic transducer provided by the embodiments of the present application, an inner thread is provided on an inner wall of the tail pipe, an outer thread is provided on an outer wall of one end of the connection seat away from the transducer core, and the connection seat is threadedly connected to the tail pipe.

[0015] In a possible implementation manner, for the ultrasonic transducer provided by the embodiments of the present application, a thread helix direction between the housing and the tail pipe is opposite to a thread helix direction between the tail pipe and the connection seat.

[0016] In a possible implementation manner, for the ultrasonic transducer provided by the embodiments of the present application, the transducer core includes:

[0017] a matching layer, a piezoelectric element, and an acoustic absorption backing. One end of the matching layer is coupled and connected to a bottom wall of the installation cavity through a coupling agent. The other end of the matching layer is connected to one end of the piezoelectric element. The other end of the piezoelectric element is connected to one end of the acoustic absorption backing. The other end of the acoustic absorption backing is connected to the connection seat.

[0018] The embodiments of the present application further provide an ultrasonic flowmeter, including the above ultrasonic transducer.

[0019] An ultrasonic transducer and an ultrasonic flowmeter provided by an embodiment of the present application. The ultrasonic transducer includes a housing, a transducer core, a connection seat, and a tail pipe. Among them, the housing is provided with an installation cavity, the transducer core is inserted into the installation cavity, one end of the transducer core is coupled to the bottom wall of the installation cavity through a coupling agent, and the coupling agent is oil. The outer peripheral wall of the transducer core and the inner peripheral wall of the installation cavity are in clearance fit, and the clearance between the transducer core and the inner wall of the installation cavity is filled with sealing oil. The other end of the transducer core is connected to one end of the connection seat, the other end of the connection seat is connected to the tail pipe, and the tail pipe is also detachably connected to the housing. The tail pipe can drive the connection seat to move away from or close to one end of the transducer core to adjust the thickness of the oil coupling layer between the transducer core and the bottom wall of the installation cavity. In this ultrasonic transducer, using oil as the coupling agent between the transducer core and the housing can avoid irreversible damage to the coupling layer between the transducer core and the housing under high temperature and high pressure, ensure the sound transmission efficiency of the ultrasonic transducer, and adjust the thickness of the coupling layer through the tail pipe, so that the ultrasonic transducer can be within the optimal sensitivity range and ensure the consistency between multiple ultrasonic transducers. In addition, filling sealing oil between the outer peripheral wall of the transducer core and the inner peripheral wall of the housing can absorb the residual vibration generated during the operation of the transducer core and the housing, improve the signal-to-noise ratio of the ultrasonic transducer, and is not easily affected by temperature and pressure changes, making the ultrasonic transducer have better stability. In summary, compared with the prior art, this ultrasonic transducer can ensure sound transmission efficiency and high stability. Description of the Drawings

[0020] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments that conform to the embodiments of the present application, and are used together with the specification to explain the principles of the embodiments of the present application.

[0021] Figure 1 It is a schematic structural diagram of an ultrasonic transducer provided by an embodiment of the present application;

[0022] Figure 2 It is an exploded schematic diagram of an ultrasonic transducer provided by an embodiment of the present application;

[0023] Figure 3 is Figure 1 The cross-sectional structural schematic diagram at A-A in

[0024] Description of the Reference Numerals:

[0025] 1 - Housing; 11 - Installation Cavity;

[0026] 2 - Transducer Core; 21 - Matching Layer; 22 - Piezoelectric Element; 23 - Acoustic Absorbing Backing; 231 - First Wire Passing Hole;

[0027] 3 - Connection Seat; 31 - Abutting Shoulder; 32 - Second Wire Passing Hole;

[0028] 4 - Tail pipe; 41 - Through - hole;

[0029] 5 - Elastic member;

[0030] 6 - Sealing cavity;

[0031] 7 - Sealing glue.

[0032] Through the above - mentioned drawings, the specific embodiments of the present application have been shown, and there will be a more detailed description hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the embodiments of the present application in any way, but to illustrate the concept of the embodiments of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the embodiments of the present application.

[0034] In the embodiments of the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation, or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above - mentioned terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to specific situations.

[0035] In addition, the terms "arrange", "connect", and "fix" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the embodiments of the present disclosure can be understood according to specific situations.

[0036] In the description and claims of the embodiments of the present application and the above-mentioned drawings, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here, for example, can be implemented in an order other than those illustrated or described here.

[0037] In the embodiments of the present application, words such as "exemplarily" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplarily" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplarily" or "for example" is intended to present relevant concepts in a specific manner.

[0038] Unless otherwise specified, the term "plurality" means two or more.

[0039] As described in the background art, ultrasonic flowmeters are gradually replacing traditional mechanical flowmeters due to their advantages such as good stability, high measurement accuracy, wide range ratio, low maintenance efficiency, small pressure loss, and easy installation. As the core component of an ultrasonic flowmeter, the performance and quality of an ultrasonic transducer affect the measurement accuracy of the ultrasonic flowmeter.

[0040] In the existing transducer core and metal housing, water coupling agent or adhesive is usually used for coupling connection to ensure that ultrasonic signals are effectively radiated into the medium to be measured after passing through the transducer housing from the transducer core. However, with the increase of service life and the cyclic pressure load, problems such as aging, detachment, and performance degradation will occur in the coupling between the transducer core and the metal housing, seriously affecting the service life of the transducer. In addition, in order to facilitate the installation and connection of the transducer core and the metal housing, the transducer core and the metal housing are generally set to have a clearance fit, and the gap between the transducer core and the metal housing is filled by means of glue sealing. However, under the use conditions of high temperature and high pressure, with the increase of use time, the transducer is prone to irreversible performance degradation, thus affecting the sound transmission efficiency and stability of the ultrasonic transducer, and further affecting the measurement accuracy of the ultrasonic flowmeter.

[0041] To solve the above problems, the present application provides an ultrasonic transducer. The transducer core is inserted into the installation cavity. One end of the transducer core is coupled to the bottom wall of the installation cavity through a coupling agent, and the coupling agent is oil, which can avoid irreversible damage to the coupling layer between the transducer core and the housing under high temperature and high pressure, and ensure the sound transmission efficiency of the ultrasonic transducer. The outer peripheral wall of the transducer core and the inner peripheral wall of the installation cavity are in clearance fit, and the clearance between the transducer core and the inner wall of the installation cavity is filled with sealing oil, which can absorb the residual vibration generated when the transducer core and the housing work, and is not easily affected by temperature and pressure changes, so that the ultrasonic transducer has better stability. The thickness of the coupling layer between the transducer core and the bottom wall of the installation cavity is adjusted by the tail pipe, so that the ultrasonic transducer can be in the optimal sensitivity range and ensure the consistency between multiple ultrasonic transducers.

[0042] The following uses specific embodiments to elaborate in detail on the technical solutions of the embodiments of the present application and how the technical solutions of the embodiments of the present application solve the above technical problems. The following several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following will describe the embodiments of the present application with reference to the drawings.

[0043] Refer to Figures 1 to 3 As shown in, the embodiments of the present application provide an ultrasonic transducer, including a housing 1, a transducer core 2, a connecting seat 3, and a tail pipe 4. Among them, the housing 1 is provided with an installation cavity 11. The transducer core 2 is inserted into the installation cavity 11. One end of the transducer core 2 is coupled to the bottom wall of the installation cavity 11 through a coupling agent, and the coupling agent is oil. The outer peripheral wall of the transducer core 2 and the inner peripheral wall of the installation cavity 11 are in clearance fit, and the clearance between the transducer core 2 and the inner wall of the installation cavity 11 is filled with sealing oil. The other end of the transducer core 2 is connected to one end of the connecting seat 3. The other end of the connecting seat 3 is connected to the tail pipe 4. The tail pipe 4 is also detachably connected to the housing 1. The tail pipe 4 can drive the connecting seat 3 to move away from or close to one end of the transducer core 2 to adjust the thickness of the oil coupling layer between the transducer core 2 and the bottom wall of the installation cavity 11.

[0044] Specifically, as shown in Figure 2 and Figure 3As shown, when assembling the ultrasonic transducer, first, one end of the transducer core 2 is connected to the connection base 3. Then, an oil coupling agent is dropped into the installation cavity 11 of the housing 1. Next, the transducer core 2 is inserted into the installation cavity 11 of the housing 1, and sealing oil is filled into the gap between the transducer core 2 and the installation cavity 11 to ensure the air in the gap is discharged. Finally, the other end of the connection base 3 is connected to the tail pipe 4. After the tail pipe 4 is connected to the connection base 3, the tail pipe 4 is connected to the housing 1, and the thickness of the oil coupling layer between the transducer core 2 and the bottom wall of the installation cavity 11 is adjusted through the tail pipe 4. For the ultrasonic transducer in the embodiment of the present application, using oil as the coupling agent between the transducer core 2 and the housing 1 can avoid irreversible damage to the coupling layer between the transducer core 2 and the housing 1 under high temperature and high pressure, ensure the sound transmission efficiency of the ultrasonic transducer, and adjust the thickness of the coupling layer through the tail pipe 4, so that the ultrasonic transducer can be within the optimal sensitivity range and ensure the consistency between multiple ultrasonic transducers. In addition, filling sealing oil between the outer peripheral wall of the transducer core 2 and the inner peripheral wall of the housing 1 can absorb the after-vibration generated when the transducer core 2 and the housing 1 work, improve the signal-to-noise ratio of the ultrasonic transducer, and is not easily affected by temperature and pressure changes, making the ultrasonic transducer have better stability. In summary, compared with the prior art, the ultrasonic transducer provided by the embodiment of the present application can ensure sound transmission efficiency and has high stability.

[0045] Among them, the housing 1 serves as the support structure of the ultrasonic transducer, and the installation cavity 11 in the housing 1 provides a stable installation environment for the transducer core 2. Optionally, the material of the housing 1 is a metal alloy, which has high strength and hardness, can withstand large mechanical stresses and impacts, and can prevent the housing 1 from being easily deformed or damaged.

[0046] Optionally, in this embodiment, the metal alloy is a titanium alloy. The titanium alloy material has good anti-corrosion and pressure resistance capabilities, can be preferably applied to high-pressure gas pipelines, and at the same time, the outer shell is prepared into a titanium alloy integral structure by machining processes to ensure the airtightness of the ultrasonic transducer. Of course, the metal alloy can also be an aluminum alloy, etc.

[0047] Optionally, in this embodiment, the materials of the connection base 3 and the tail pipe 4 are both metals, such as alloy steel, alloy aluminum, or metal copper, etc., which are not specifically limited in this embodiment.

[0048] Among them, the transducer core 2 is the core component of the ultrasonic transducer, which realizes the energy conversion between electrical signals and mechanical vibrations. Specifically, when the ultrasonic transducer receives an electrical signal, the electrical signal is first applied to the transducer core 2. The transducer core 2 is made of piezoelectric material. When excited by the electrical signal, it will deform and generate mechanical vibrations. The mechanical vibrations propagate in the medium in the form of ultrasonic waves. The ultrasonic waves generated by the transducer core 2 are transmitted to the bottom wall of the installation cavity 11 or the external medium through the oil coupling layer. The oil coupling layer, as the transmission medium of the sound wave, can reduce the energy loss of the sound wave during propagation. When the ultrasonic wave encounters an obstacle or interface, phenomena such as reflection, refraction, or scattering will occur. Part of the reflected ultrasonic wave will pass through the oil coupling layer again and return to the transducer core 2, and be converted into an electrical signal for reception and processing.

[0049] Optionally, in this embodiment, the oil coupling agent and the sealing oil can be silicone oil or castor oil, etc., and no specific limitation is made here.

[0050] It should also be noted that the oil coupling agent and the sealing oil in this embodiment also have a certain lubricating effect, which can reduce the friction between the transducer core 2 and the installation cavity 11 and extend the service life of the transducer core 2.

[0051] One end of the transducer core 2 is connected to one end of the connecting seat 3. Optionally, there are various connection methods between the transducer core 2 and the connecting seat 3. For example, the transducer core 2 and the connecting seat 3 can be bonded, or the transducer core 2 and the connecting seat 3 can be snap-connected, or they can be connected by fasteners, etc. No specific limitation is made here.

[0052] Optionally, one end of the connecting seat 3 and the tail pipe 4 are detachably connected. For example, threaded connection, snap connection, or connection by fasteners, etc. No specific limitation is made here.

[0053] Optionally, there are various ways to detachably connect the tail pipe 4 and the housing 1. For example, threaded connection, snap connection, or connection by fasteners, etc. No specific limitation is made here.

[0054] Optionally, there are various ways to adjust the thickness of the oil coupling layer between the transducer core 2 and the bottom wall of the installation cavity 11 through the tail pipe 4. For example, different snap points can be set on the housing 1. When the tail pipe 4 is snap-connected to different snap points, the thickness of the oil coupling layer is different, so as to achieve the purpose of adjusting the thickness of the oil coupling layer. By adjusting the appropriate thickness of the oil coupling layer, it can ensure good energy transmission efficiency during the emission and reception of ultrasonic waves, thereby ensuring the overall performance of the ultrasonic transducer.

[0055] Reference Figure 2 and Figure 3As shown in the figure, in an optional embodiment, the ultrasonic transducer further includes an elastic member 5 sleeved on the outer periphery of the connecting seat 3. An abutting shoulder 31 is provided on the outer periphery of the connecting seat 3. One end of the elastic member 5 abuts against the abutting shoulder 31, and the other end of the elastic member 5 abuts against one end of the tail pipe 4 close to the connecting seat 3. The tail pipe 4 can drive the elastic member 5 to be compressed, and the tail pipe 4 can adjust the compression distance of the elastic member 5 to adjust the thickness of the oil coupling layer.

[0056] Specifically, in this embodiment, by arranging the elastic member 5 sleeved on the outer periphery of the connecting seat 3, and one end of the elastic member 5 abuts against the abutting shoulder 31 on the outer periphery of the connecting seat 3, and the other end abuts against one end of the tail pipe 4. Thus, when the tail pipe 4 is detachably connected to the housing 1, by adjusting the position of the tail pipe 4 to move it in the direction close to the transducer core 2, the elastic member 5 can be driven to be compressed. The elastic restoring force of the elastic member 5 can drive the connecting seat 3 and the transducer core 2 to move in the direction of the bottom wall of the installation cavity 11, and by changing the compression distance of the elastic member 5, the thickness of the oil coupling layer can be changed. Thus, through the cooperation of the tail pipe 4, the elastic member 5 and the connecting seat 3, the adjustment of the thickness of the oil coupling layer can be realized, so that the ultrasonic transducer has good sound transmission efficiency and good sensitivity.

[0057] Optionally, the elastic member 5 is made of a material with good elasticity and durability, such as a spring, a rubber ring or an elastic metal sheet, etc. Further, in this embodiment, the elastic member 5 is taken as a compression spring as an example.

[0058] Wherein, an abutting shoulder 31 is provided on the outer periphery of the connecting seat 3, and the abutting shoulder 31 provides a stable support point for the elastic member 5. Optionally, the abutting shoulder 31 can be integrally provided with the connecting seat 3 or detachably connected.

[0059] It should be noted that the thickness of the oil coupling layer corresponding to the compression distance of the elastic member 5 is obtained through multiple tests. In this embodiment, the corresponding relationship between the compression distance and the thickness of the oil coupling layer is not specifically limited.

[0060] Optionally, scale values are provided on the outer periphery of the tail pipe 4, and different scale values represent different oil coupling layer distances. Thus, the scale values assist the tail pipe 4 to adjust the thickness of the oil coupling layer. The above scale values are also obtained through multiple tests.

[0061] Reference Figure 2 and Figure 3 As shown in the figure, in an optional embodiment, a sealing cavity 6 is formed by enclosing the inner peripheral wall of the installation cavity 11, one end of the tail pipe 4 close to the connecting seat 3, the outer peripheral wall of the connecting seat 3 and the abutting shoulder 31. The elastic member 5 is arranged in the sealing cavity 6, and the sealing cavity 6 is filled with sealing oil.

[0062] Specifically, in this embodiment, an inner peripheral wall of the installation cavity 11, one end of the tail pipe 4 close to the connecting seat 3, an outer peripheral wall of the connecting seat 3, and the abutting shoulder 31 jointly enclose a sealing cavity 6, and sealing oil is filled into the sealing cavity 6. With such a setting, the entire transducer core 2 can be sealed, preventing external impurities, moisture, etc. from invading the transducer core 2, reducing performance degradation or failures caused by external environmental factors, and ensuring the service life of the transducer core 2. In addition, submerging the elastic member 5 in the sealing oil can reduce the friction between the elastic member 5 and surrounding components and delay the aging rate of the elastic member 5.

[0063] Optionally, in this embodiment, the sealing oil can be silicone oil, castor oil, etc., and no specific limitation is made here.

[0064] In an alternative embodiment, a sealing glue 7 is filled at one end of the tail pipe 4 away from the connecting seat 3, and the sealing glue 7 is used to seal the sealing cavity 6.

[0065] Specifically, as described in Figure 3 , by filling the sealing glue 7 at one end of the tail pipe 4 away from the connecting seat 3, a strong sealing barrier is formed, which can prevent the sealing oil in the sealing cavity 6 from leaking from one end of the tail pipe 4 and also prevent external gases, liquids, or impurities from entering the sealing cavity 6, thus playing a role in sealing the sealing cavity 6.

[0066] Optionally, a sealing glue 7 with high adhesiveness, good corrosion resistance, and high temperature resistance is selected to seal the sealing cavity 6. In addition, bubbles and gaps are avoided during the filling process of the sealing glue 7 to ensure the sealing effect.

[0067] In an alternative embodiment, an internal thread is provided on the inner wall of the housing 1, and an external thread matching the internal thread is provided on the outer wall of the tail pipe 4. The housing 1 is threadedly connected to the tail pipe 4, and the internal thread of the housing 1 and / or the external thread of the tail pipe is coated with thread glue.

[0068] Specifically, in this embodiment, by providing an internal thread on the inner wall of the housing 1 and an external thread on the outer wall of the tail pipe 4, the housing 1 and the tail pipe 4 can be threadedly connected. The threaded connection method can quickly install the tail pipe 4 and the housing 1 and also facilitate the disassembly and maintenance of the ultrasonic transducer. Further, thread glue is applied to the internal thread of the housing 1 and / or the external thread of the tail pipe 4, which can ensure the connection effect between the housing 1 and the tail pipe 4 and also play a sealing role.

[0069] Optionally, a limiting shoulder is provided on the inner wall of the housing 1, and the limiting shoulder can abut against one end of the tail pipe 4 close to the transducer core 2. The limiting shoulder is used to limit the moving distance of the tail pipe 4 in the direction of the bottom wall of the housing 1, avoiding the situation where the transducer core 2 is damaged due to the excessive movement of the tail pipe 4 and the extrusion between the transducer core 2 and the bottom wall of the housing 1.

[0070] Optionally, the outer peripheral portion of the end of the tail pipe 4 away from the transducer core 2 is provided with a prismatic structure. Thus, the tail pipe 4 can be conveniently rotated through the prismatic structure to quickly install or disassemble the tail pipe 4 from the housing 1.

[0071] In an alternative embodiment, the inner wall of the tail pipe 4 is provided with internal threads, and the outer wall of the end of the connecting seat 3 away from the transducer core 2 is provided with external threads. The connecting seat 3 is threadedly connected to the tail pipe 4.

[0072] Specifically, by providing internal threads on the inner wall of the tail pipe 4 and external threads on the outer wall of one end of the connecting seat 3, the connecting seat 3 is threadedly connected to the tail pipe 4. With such a setting, the connecting seat 3 can be quickly installed or disassembled from the tail pipe 4, which is convenient for the later maintenance of the ultrasonic transducer.

[0073] Optionally, thread sealant is applied to the internal threads of the tail pipe 4 and / or the external threads of the connecting seat 3, so as to ensure the connection effect between the tail pipe 4 and the connecting seat 3 and also play a sealing role.

[0074] Optionally, the thread helix direction between the housing 1 and the tail pipe 4 is opposite to the thread helix direction between the tail pipe 4 and the connecting seat 3. By setting the thread helix direction between the housing 1 and the tail pipe 4 to be opposite to the thread helix direction between the tail pipe 4 and the connecting seat 3, the opposite thread helix directions can play a self-locking role, which can avoid the loosening of the connection caused by factors such as vibration or temperature. Thus, the connection stability between the housing 1 and the tail pipe 4 and between the tail pipe 4 and the connecting seat 3 is ensured. In addition, it can also prevent the situation where the tail pipe 4 is separated from the transducer core 2 during disassembly.

[0075] Reference Figure 2 and Figure 3 As shown in

[0076] and

[0077] In an alternative embodiment, the transducer core 2 includes a matching layer 21, a piezoelectric element 22, and an acoustic backing 23. One end of the matching layer 21 is coupled to the bottom wall of the mounting cavity 11 through a coupling agent, the other end of the matching layer 21 is connected to one end of the piezoelectric element 22, the other end of the piezoelectric element 22 is connected to one end of the acoustic backing 23, and the other end of the acoustic backing 23 is connected to the connecting seat 3.

[0076] Specifically, in this embodiment, the transducer core 2 includes a matching layer 21, a piezoelectric element 22, and an acoustic backing 23, and the matching layer 21, the piezoelectric element 22, and the acoustic backing 23 are connected in sequence.

[0077] Among them, the piezoelectric element 22 is a circular columnar piezoelectric ceramic that can convert electrical energy and mechanical energy into each other, and is mainly used for transmitting and receiving ultrasonic waves; the matching layer 21, also known as the acoustic matching layer 21, is a composite circular thin sheet. The matching layer 21 can better complete the acoustic matching between the piezoelectric element 22 and the gas medium, and achieve high-efficiency ultrasonic transmission; the acoustic backing 23 is an acoustic absorption structure, and its function is to increase the damping of the vibration system of the ultrasonic transducer, accelerate the elimination of the aftershock of the ultrasonic transducer, and improve the sensitivity of the ultrasonic transducer. Usually, high-attenuation and high-acoustic-absorption materials are used.

[0078] Optionally, the matching layer 21 is bonded to the positive electrode surface of the piezoelectric element 22 to achieve high-efficiency ultrasonic transmission; the acoustic backing 23 is bonded to the negative electrode surface of the piezoelectric element 22 to absorb the reverse vibration of the piezoelectric element 22, so as to improve the sensitivity of the ultrasonic transducer. Of course, the bonding method between the matching layer 21 and the piezoelectric element 22 and between the acoustic backing 23 and the piezoelectric element 22 is not limited to bonding.

[0079] Optionally, the end face of the acoustic backing 23 away from the piezoelectric element 22 is adhesively fixed to the connecting seat 3. With this setting, it can ensure the close contact and stable connection between the acoustic backing 23 and the connecting seat 3. In addition, the adhesive material should have good adhesion and high-temperature resistance to withstand the stress and temperature changes that may occur during the operation of the ultrasonic transducer.

[0080] Optionally, a positioning groove is provided at one end of the connecting seat 3 where it is bonded to the acoustic backing 23, and the acoustic backing 23 can be inserted into the positioning groove. Thus, when bonding the acoustic backing 23, first apply adhesive to the bottom wall of the positioning groove or the end face of the acoustic backing 23, and then insert the acoustic backing 23 into the positioning groove. In this way, the acoustic backing 23 can be conveniently and quickly bonded and fixed to the connecting seat 3.

[0081] Optionally, the piezoelectric element 22 is a cylindrical piezoelectric ceramic, and it uses a wrapped electrode. Of course, in other embodiments, double-sided electrodes can also be selected for the piezoelectric ceramic.

[0082] Specifically, referring to Figure 2 and Figure 3 as shown in, the piezoelectric element 22 is also connected with a positive electrode wire and a negative electrode wire, and the positive electrode wire and the negative electrode wire are used for the transmission of electrical signals. More specifically, the acoustic backing 23 is provided with a first wire passing hole 231, the tail tube 4 is provided with a through hole 41 penetrating the body, the connecting seat 3 is provided with a second wire passing hole 32 penetrating the body, and the positive electrode wire and the negative electrode wire pass through the first wire passing hole 231 and the second wire passing hole 32 in sequence, and extend out of the ultrasonic transducer through the through hole 41 of the tail tube 4. Optionally, in this embodiment, two first wire passing holes 231 are provided, and the positive electrode wire and the negative electrode wire respectively pass through the two first wire passing holes 231, so as to avoid interference between the positive and negative wires.

[0083] The embodiment of the present application further provides an ultrasonic flowmeter, including the above ultrasonic transducer, and the ultrasonic transducer can ensure the measurement accuracy of the ultrasonic flowmeter.

[0084] Those skilled in the art will readily conceive of other embodiments of the embodiments of the present application after considering the specification and practicing the utility model disclosed herein. The embodiments of the present application are intended to cover any variations, uses, or adaptations of the embodiments of the present application, which follow the general principles of the embodiments of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the embodiments of the present application. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the embodiments of the present application are pointed out by the following claims.

[0085] It should be understood that the embodiments of the present application are not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the embodiments of the present application is only limited by the appended claims.

Claims

1. An ultrasonic transducer, characterized in that: include: A housing and a transducer core, wherein the housing is provided with a mounting cavity, the transducer core is inserted into the mounting cavity, one end of the transducer core is coupled to the bottom wall of the mounting cavity by a coupling agent, and the coupling agent is oil, the outer peripheral wall of the transducer core and the inner peripheral wall of the mounting cavity are clearance-matched, and the clearance between the transducer core and the inner wall of the mounting cavity is filled with sealing oil; A connecting seat and a tail pipe, the other end of the transducer core is connected to one end of the connecting seat, the other end of the connecting seat is connected to the tail pipe, the tail pipe is also detachably connected to the shell, and the tail pipe can drive the connecting seat to move away from or close to one end of the transducer core to adjust the thickness of the oil coupling layer between the transducer core and the bottom wall of the installation cavity.

2. The ultrasonic transducer according to claim 1, characterized in that: Also includes: An elastic member, wherein the elastic member is sleeved on the outer circumference of the connecting seat, an abutting shoulder is provided on the outer circumference of the connecting seat, one end of the elastic member abuts against the abutting shoulder, and the other end of the elastic member abuts against one end of the tail pipe close to the connecting seat, the tail pipe can drive the elastic member to compress, and the tail pipe can adjust the compression distance of the elastic member to adjust the thickness of the oil coupling layer.

3. The ultrasonic transducer according to claim 2, characterized in that: The inner circumferential wall of the installation cavity, one end of the tail pipe close to the connecting seat, the outer circumferential wall of the connecting seat and the abutting shoulder are arranged to form a sealing cavity, the elastic member is arranged in the sealing cavity, and the sealing cavity is filled with sealing oil.

4. The ultrasonic transducer according to claim 3, characterized in that: One end of the tail pipe away from the connecting seat is filled with sealant, and the sealant is used to seal the sealing cavity.

5. The ultrasonic transducer according to claim 1, characterized in that: The inner wall of the shell is provided with an internal thread, the outer wall of the tail pipe is provided with an external thread matching the internal thread, the shell is threadedly connected to the tail pipe, and the internal thread of the shell and / or the external thread of the tail pipe are coated with thread glue.

6. The ultrasonic transducer according to claim 5, characterized in that: The inner wall of the shell is provided with a limiting shoulder, one end of the tail pipe can abut against the limiting shoulder, and the limiting shoulder is used to limit the moving distance of the tail pipe toward the bottom wall of the shell.

7. The ultrasonic transducer according to claim 5, characterized in that: The inner wall of the tail pipe is provided with an internal thread, the outer wall of the connecting seat away from one end of the transducer core is provided with an external thread, and the connecting seat is threadedly connected to the tail pipe.

8. The ultrasonic transducer according to claim 7, characterized in that: The thread direction between the housing and the tail pipe is opposite to the thread direction between the tail pipe and the connecting seat.

9. The ultrasonic transducer according to any one of claims 1 to 8, characterized in that: The transducer core comprises: A matching layer, a piezoelectric element and a sound-absorbing backing, wherein one end of the matching layer is coupled to the bottom wall of the mounting cavity through a coupling agent, the other end of the matching layer is connected to one end of the piezoelectric element, the other end of the piezoelectric element is connected to one end of the sound-absorbing backing, and the other end of the sound-absorbing backing is connected to the connecting seat.

10. An ultrasonic flow meter, characterized in that: include: An ultrasonic transducer as claimed in any one of claims 1 to 9.

Images