WO2022142758A1 - 一种超声波换能器 - Google Patents

一种超声波换能器 Download PDF

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Publication number
WO2022142758A1
WO2022142758A1 PCT/CN2021/129916 CN2021129916W WO2022142758A1 WO 2022142758 A1 WO2022142758 A1 WO 2022142758A1 CN 2021129916 W CN2021129916 W CN 2021129916W WO 2022142758 A1 WO2022142758 A1 WO 2022142758A1
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WO
WIPO (PCT)
Prior art keywords
tail pipe
rod body
sound
thread
stopper
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PCT/CN2021/129916
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English (en)
French (fr)
Inventor
丁渊明
陈倩
彭小健
陈红
Original Assignee
金卡智能集团股份有限公司
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Application filed by 金卡智能集团股份有限公司 filed Critical 金卡智能集团股份有限公司
Priority to EP21913501.9A priority Critical patent/EP4269954A1/en
Priority to US18/254,538 priority patent/US20240044682A1/en
Publication of WO2022142758A1 publication Critical patent/WO2022142758A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/18—Supports or connecting means for meters
    • G01F15/185—Connecting means, e.g. bypass conduits

Definitions

  • the present application relates to the technical field of transducers.
  • it relates to an ultrasonic transducer.
  • Ultrasonic flowmeters are gradually replacing traditional mechanical flowmeters by virtue of their good stability, high measurement accuracy, wide range ratio, low maintenance rate, small pressure loss, and easy installation.
  • the quality and performance of ultrasonic transducer affect the accuracy of measurement.
  • the embodiments of the present application provide an ultrasonic transducer that is easy to replace.
  • the embodiments of the present application provide an ultrasonic transducer, including a casing, a transducer core and a tail pipe;
  • One end of the casing has an opening and the other end is closed, the transducer core is arranged in the casing, and one end of the transducer core is in close contact with the closed end of the casing and is coupled through a coupling agent connect;
  • the tail pipe is connected with the end of the transducer core, and the tail pipe is detachably connected with the housing.
  • an inner wall of the casing close to the opening is provided with an inner thread
  • an outer wall of the tail pipe is provided with an outer thread corresponding to the inner thread
  • the The casing and the tail pipe are detachably connected to the outer thread through the inner thread.
  • the transducer core includes a matching layer, a piezoelectric element, and a sound-absorbing backing;
  • the piezoelectric element is cylindrical, the matching layer is arranged on one end face of the piezoelectric element, and the sound-absorbing backing is arranged on the other end face of the piezoelectric element;
  • the tail pipe is connected to the sound absorbing backing.
  • it further includes a positive electrode lead and a negative electrode lead; one ends of the positive electrode lead and the negative electrode lead are respectively connected to the piezoelectric element;
  • a wire hole is opened along the axial direction of the sound-absorbing backing, and the other ends of the positive wire and the negative wire pass through the wire hole and through the center of the tail pipe through holes.
  • connection component further includes a connection component
  • the connecting assembly is arranged between the tail pipe and the sound-absorbing backing;
  • the connecting assembly includes a rod body and an elastic member;
  • the elastic piece is sleeved on the rod body, one end of the rod body is provided with a stopper, one end of the elastic piece abuts on the stopper, and the other end of the elastic piece abuts against the stopper. the end face of the tail pipe;
  • the rod body and the stopper are respectively provided with a central through hole, which is communicated with the central through hole of the tail pipe, the block on the rod body is connected with the sound-absorbing backing, and the rod body is far away from all the One end of the stopper is connected to the tail pipe.
  • the inner wall of the tail pipe is provided with an internal thread
  • the outer wall of the rod body is provided with an external thread
  • the rod body is threadedly connected to the tail pipe
  • the thread rotation direction between the rod body and the tail pipe is opposite to the thread rotation direction between the tail pipe and the casing.
  • connection assembly further includes a connection plate, one end of the connection plate is connected to the sound-absorbing backing, and the other end is connected to the stopper on the rod body;
  • the connecting plate is provided with a central through hole, which communicates with the central through-hole of the rod body, the central through-hole of the stopper and the central through-hole of the tail pipe;
  • the central position of the connecting plate is provided with a convex column, the outer wall of the convex column is provided with an external thread, the hole wall of the central through hole of the stopper is provided with an internal thread, and the convex column and the stopper are provided with an inner thread. threaded connection;
  • the thread rotation direction between the protruding post and the stopper is the same as the thread rotation direction between the rod body and the tail pipe.
  • a wire-passing groove is opened on one end surface of the connection plate close to the sound-absorbing backing.
  • At least two sealing ring grooves are provided on the outer wall of the housing.
  • the tail pipe is rotated to separate the tail pipe from the shell, and the transducer core is pulled outward to make the transducer
  • the transducer core is released from the casing, and the structure can realize the replacement of the transducer core without disassembling the casing together.
  • the operation is simple, the cost of replacement and maintenance is reduced, and the economic interests of the user are guaranteed at the same time.
  • FIG. 1 is a schematic structural diagram of an ultrasonic transducer according to an embodiment of the application.
  • FIG. 2 is a cross-sectional view of an ultrasonic transducer according to an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of an ultrasonic transducer provided by an embodiment of the application
  • FIG. 2 is a cross-sectional view of an ultrasonic transducer provided by an embodiment of the application.
  • the embodiment of the application may include Shell 1, transducer core and tail pipe 2;
  • One end of the housing 1 has an opening, the other end is closed, the transducer core is arranged in the housing 1, and one end of the transducer core is closely attached to the closed end of the housing and is coupled and connected by a coupling agent;
  • the tail pipe 2 is connected with the end of the transducer core, and the tail pipe 2 is detachably connected with the housing 1 .
  • the closed end of the transducer casing protrudes into the gas pipeline.
  • the tail pipe 2 is disassembled from the casing 1. , so that the tail pipe 2 is separated from the casing 1. Since the tail pipe 2 is connected with the transducer core, when the tail pipe 2 is disengaged from the casing 1, the transducer core can be detached from the casing 1.
  • the structure can realize the replacement of the transducer core without disassembling the casing 1 together, the operation is simple, the cost of replacement and maintenance is reduced, and the economic benefit of the user is guaranteed at the same time.
  • the casing 1 and the transducer core are coupled by means of couplant, which not only ensures the transmission of sound waves, but also realizes the operation of extracting the transducer core from the casing 1 and replacing it, which saves time and protect the interests of users.
  • the shell 1 can be made of titanium alloy material, which has good anti-corrosion and pressure resistance functions, and can be better used in high-pressure gas pipelines. Transducer air tightness.
  • the inner wall of the casing 1 close to the open end is provided with an inner thread
  • the outer wall of the tail pipe 2 is provided with an outer thread corresponding to the inner thread
  • the casing 1 and the tail pipe 2 can be connected by the inner thread and the outer thread. Remove the connection.
  • the connection mode between the casing 1 and the tail pipe 2 is not limited to threaded connection, which is not specifically limited in this embodiment.
  • the tail pipe 2 and the shell 1 are threaded to control the pre-tightening force to ensure the same amount of couplant at the front end of the transducer core (ie the end away from the tail pipe 2), thereby ensuring the consistency of the transducer.
  • the length of the tail pipe 2 can be changed according to the size of the watch body and the size of the installation hole of the ultrasonic transducer, so as to facilitate the extraction of the transducer core from the casing 1 .
  • the transducer core includes a matching layer 31 , a piezoelectric element 32 and a sound absorbing backing 33 .
  • the matching layer 31 also known as the acoustic matching layer 31, is a circular sheet of composite material based on epoxy resin and hollow glass beads.
  • the matching layer 31 can better complete the connection between the piezoelectric element 32 and the gas medium. Acoustic matching to achieve high-efficiency ultrasonic transmission.
  • the piezoelectric element 32 is a circular cylindrical piezoelectric ceramic that can realize the mutual conversion of electrical energy and mechanical energy, and is mainly used for transmitting and receiving ultrasonic waves.
  • the sound-absorbing backing 33 is a sound-absorbing structure, and its function is to increase the damping of the transducer vibration system, accelerate the elimination of the aftershock of the transducer, and improve the sensitivity of the ultrasonic transducer.
  • the piezoelectric element 32 is a cylindrical piezoelectric ceramic, which uses an edge-wrapped electrode; the matching layer 31 is arranged on one end face of the piezoelectric element 32 , and the sound-absorbing backing 33 is arranged on the side of the piezoelectric element 32 . On the other end surface; the tail pipe 2 is connected with the sound-absorbing backing 33 .
  • both the matching layer 31 and the sound absorbing backing 33 can be fixed on the piezoelectric element 32 by means of bonding, but are not limited to the bonding method, which is not specifically limited in this embodiment.
  • the casing 1 is made of titanium alloy, which can avoid deformation and peeling of the matching layer 31 under high pressure environment, and improve the service life of the ultrasonic transducer.
  • it may further include a positive electrode lead 4 and a negative electrode lead 5; one ends of the positive electrode lead 4 and the negative electrode lead 5 are respectively connected to the piezoelectric element 32;
  • a wire hole 331 is opened along the axial direction of the sound-absorbing backing 33, and the other ends of the positive lead 4 and the negative lead 5 pass through the wire hole 331 and through the central through hole of the tail pipe 2. out.
  • the positive lead 4 and the negative lead 5 are used for the transmission of electrical signals.
  • the piezoelectric ceramics may be double-sided electrodes, or may be edge-wrapped electrodes, which are not limited in this embodiment.
  • the positive lead 4 and the negative lead 5 are drawn out from the two end faces of the piezoelectric ceramic respectively; by using the edge-wrapped electrode, the positive lead 4 and the negative lead 5 can both be drawn from the back of the piezoelectric ceramic (ie, the piezoelectric element). 32 close to the side of the sound-absorbing backing 33 ), which saves the internal space of the transducer housing 1 .
  • the at least two wire-passing holes 331 are distributed at intervals along the radial direction of the sound-absorbing backing 33 .
  • the at least two wire holes 331 include a first wire hole 331 for the positive wire 4 to pass through and a second wire hole 331 for the negative wire to pass through.
  • the wire-passing holes 331 can also be opened on the side wall of the sound-absorbing backing 33, and the wire-passing holes 331 penetrate through both end surfaces of the sound-absorbing backing 33, so that the positive wire 4 and the negative wire 5 can pass from The side walls of the sound absorbing backing 33 protrude.
  • a connecting component may also be included, the connecting component is made of metal material, the connecting component is disposed between the tail pipe and the sound-absorbing backing, and the connecting component includes a rod body 61 and an elastic member 62 .
  • the elastic member 62 is sleeved on the rod body 61, and one end of the rod body 61 is provided with a stopper 611 for limiting the position of the elastic member 62.
  • One end of the elastic member 62 abuts on the stopper 611, and the other end abuts on the end of the tailpipe.
  • the rod body 61 and the stopper 611 are respectively provided with a central through hole, which is communicated with the central through hole of the tail pipe 2.
  • the center through hole is punched out.
  • the block 611 on the rod body 61 is connected with the sound-absorbing backing 33 , and the end of the rod body 61 away from the block 611 is connected with the tail pipe 2 .
  • the inner wall of the tail pipe 2 is provided with internal threads
  • the outer wall of the rod body 61 is provided with external threads
  • the rod body 61 is threadedly connected with the tail pipe 2 .
  • the thread rotation direction between the rod body 61 and the tail pipe 2 is opposite to the thread rotation direction between the tail pipe 2 and the housing 1, so as to prevent the tail pipe 2 from being separated from the transducer core during disassembly.
  • the elastic member 62 can be a spring, and the outer diameter of the spring is smaller than the outer diameter of the tail pipe.
  • the spring is used to control the tightening force during installation, and can lift the transducer core during installation. To a certain buffer effect, avoid hard contact during positioning, resulting in the fragmentation of piezoelectric ceramics.
  • connection assembly further includes a connection pad 63, and the connection pad 63 is made of plastic insulating material.
  • One end of the connecting plate 63 is connected with the sound-absorbing backing 33 , and the other end is connected with the stopper 611 on the rod body 61 .
  • the connecting plate is provided with a central through hole, and the central through hole on the connecting plate communicates with the central through hole of the rod body, the central through hole of the stopper and the central through hole of the tail pipe.
  • the connection plate 63 and the sound-absorbing backing 33 may be bonded by means of bonding, but not limited to the bonding method, which is not limited in this embodiment.
  • the central position of the connecting plate 63 is provided with a protruding post 631 , the outer wall of the protruding post 631 is provided with an external thread, the hole wall of the central through hole of the stopper 611 is provided with an internal thread, and the protruding post 631 is threadedly connected with the stopper 611 .
  • the thread rotation direction between the protruding post 631 and the stopper 611 is the same as the thread rotation direction between the rod body 61 and the tail pipe 2 .
  • the rod body 61 can be recycled after being pulled out, and the rod body 61 will not be damaged.
  • a wire-passing groove 632 is opened on one end surface of the connecting plate 63 close to the sound-absorbing backing 33 .
  • the wire slot 632 is used to place the positive wire 4 and the negative wire 5 passing through the sound-absorbing backing 33 .
  • At least two sealing ring grooves 11 are provided on the outer wall of the housing 1 .
  • fittings can be flexibly designed according to the size and size of different gas meter meter bodies to achieve installation and use, and there is no need to modify and process the size of the housing 1 of the transducer.
  • the ultrasonic transducer provided by the embodiment of the present application can be disassembled under pressure when the transducer core is faulty, and at the same time, the transducer core can be pulled out for replacement without disassembling the shell, which reduces the need for Maintenance costs, while protecting the economic interests of users.

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  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

一种超声波换能器，包括壳体(1)、换能器芯体以及尾管(2)；壳体(1)一端具有开口，另一端封闭，换能器芯体设在壳体(1)内，换能器芯体的一端与壳体(1)的封闭端贴紧并通过耦合剂耦合连接；尾管(2)与换能器芯体的端部连接，且尾管(2)与壳体(1)可拆卸连接。该换能器用于燃气表对燃气流量进行计量。

Description

一种超声波换能器
本申请要求于2020年12月28日提交中国专利局、申请号为202011600440.2、申请名称为“一种超声波换能器”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及换能器技术领域。尤其是涉及一种超声波换能器。
背景技术
超声波流量计凭借其稳定性好、测量精度高、量程比宽、维修率低、压力损失小、安装方便等优点，正逐步取代传统的机械式流量计。超声波换能器作为超声波流量计的核心部件，其质量、性能等均影响着计量的准确性。
目前针对相关技术中激光点云定位图层占用的存储空间大的问题，尚未提出有效的解决方案。
发明内容
有鉴于此，本申请实施例提供一种方便更换的超声波换能器。
本申请实施例提供一种超声波换能器，包括壳体、换能器芯体以及尾管；
所述壳体一端具有开口，另一端封闭，所述换能器芯体设在所述壳体内，所述换能器芯体的一端与所述壳体的封闭端贴紧并通过耦合剂耦合连接；
所述尾管与所述换能器芯体的端部连接，且尾管与所述壳体可拆卸连接。
根据本申请实施例的一种具体实现方式，所述壳体靠近所述开口的内壁上设有内螺纹，所述尾管的外壁上设有与所述内螺纹相对应的外螺纹，所述壳体与所述尾管通过所述内螺纹与所述外螺纹可拆卸连接。
根据本申请实施例的一种具体实现方式，所述换能器芯体包括匹配层、压电元件以及吸声背衬；
所述压电元件呈柱形，所述匹配层设在所述压电元件的其中一端面上，所述吸声背衬设在所述压电元件的另一端面上；
所述尾管与所述吸声背衬连接。
根据本申请实施例的一种具体实现方式，还包括正极导线和负极导线；所述正极导线和所述负极导线的一端分别与压电元件连接；
在所述吸声背衬上，沿吸声背衬的轴向开设有过线孔，所述正极导线与所述负极导线的另一端穿过所述过线孔并通过所述尾管的中心通孔穿出。
根据本申请实施例的一种具体实现方式，所述过线孔开设有至少两个，至少两个所述过线孔沿所述吸声背衬的径向间隔分布。
根据本申请实施例的一种具体实现方式，还包括连接组件；
所述连接组件设在所述尾管与所述吸声背衬之间；所述连接组件包括杆体以及弹性件；
其中，所述弹性件套设在所述杆体上，所述杆体的一端设有挡块，所述弹性件的一端抵接于所述挡块上，所述弹性件的另一端抵接于所述尾管的端面上；
所述杆体与所述挡块上分别设有中心通孔，且与所述尾管的中心通孔相连通，所述杆体上的挡块与所述吸声背衬连接，所述杆体远离所述挡块的一端与所述尾管连接。
根据本申请实施例的一种具体实现方式，所述尾管的内壁设有内螺纹，所述杆体的外壁设有外螺纹，所述杆体与所述尾管螺纹连接；
其中，杆体和尾管之间的螺纹旋向与尾管和壳体之间的螺纹旋向相反。
根据本申请实施例的一种具体实现方式，所述连接组件还包括连接盘，所述连接盘的一端与所述吸声背衬连接，另一端与所述杆体上的挡块连接；所述连接盘上设有中心通孔，与杆体的中心通孔、挡块的中心通孔以及尾管的中心通孔连通；
所述连接盘的中心位置上设有凸柱，所述凸柱的外壁设有外螺纹，所述挡块的中心通孔的孔壁上设有内螺纹，所述凸柱与所述挡块螺纹连接；
其中，所述凸柱与所述挡块之间的螺纹旋向与所述杆体和所述尾管之间的螺纹旋向相同。
根据本申请实施例的一种具体实现方式，所述连接盘靠近所述吸声背衬的一端面上开设有过线槽。
根据本申请实施例的一种具体实现方式，所述壳体的外壁上设有至少两个密封圈槽。
本申请实施例提供的一种超声波换能器，当超声波换能器损坏需要维修或者更换时，转动尾管，使尾管与壳体脱离，并向外拉动换能器芯体，使换能器芯体从壳体内脱出，该结构无需将壳体一同拆卸下来即可实现换能器芯体的更换，操作简单，降低了更换和维护的成本，同时保障了用户的经济利益。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1为本申请一实施例超声波换能器的结构示意图；
图2为本申请一实施例超声波换能器的剖视图。
具体实施方式
下面结合附图对本申请实施例进行详细描述。
应当明确，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
图1为本申请一实施例提供的超声波换能器的结构示意图；图2为本申请一实施例提供的超声波换能器的剖视图，如图1和图2所示，本申请实施例可包括壳体1、换能器芯体以及尾管2；
壳体1的一端具有开口，另一端封闭，换能器芯体设在壳体1内，换能器芯体的一端与壳体的封闭端贴紧并通过耦合剂耦合连接；
尾管2与换能器芯体的端部连接，且尾管2与壳体1可拆卸连接。
换能器在正常使用时，换能器壳体的封闭端是伸入在燃气管道内的，在需要对换能器芯体进行拆卸或者更换时，将尾管2从壳体1上拆卸下来，使尾管2脱离壳体1，由于尾管2与换能器芯体相连接，因此，当尾管2与壳体1脱离时，换能器芯体能够从壳体1内脱出。
该结构无需将壳体1一同拆卸下来即可实现换能器芯体的更换，操作简单，降低了更换和维护的成本，同时保障了用户的经济利益。采用耦合剂的 方式将壳体1与换能器芯体进行耦合，既保证了声波的传递又实现了将换能器芯体从壳体1内抽离并进行更换的操作，节省了时间并保障了用户的利益。
本实施例，壳体1可采用钛合金材料，其具有较好的防腐及耐压功能，可较好的应用于高压气体管道内，同时该外壳采用机加工工艺制备成钛合金一体结构保证了换能器的气密性。
在一实施例中，壳体1靠近开口端的内壁上设有内螺纹，尾管2的外壁上设有与内螺纹相对应的外螺纹，壳体1与尾管2通过内螺纹与外螺纹可拆卸连接。实际生产和使用时，壳体1与尾管2之间的连接方式不限于螺纹连接，本实施例在此不作具体限定。
在对换能器芯体进行安装时，只需转动尾管2，使尾管2上的外螺纹与壳体1的内螺纹配合，即实现换能器芯体的安装。
尾管2与壳体1采用螺纹配合的方式进行预紧力的控制，确保换能器芯体前端(即远离尾管2的一端)耦合剂用量一致，从而保证换能器的一致性。
在对换能器芯体进行拆卸时，只需反向转动尾管2，使尾管2与壳体1脱开，然后将换能器芯体向外抽出壳体1即可，操作方便。
尾管2的长度可根据表体大小及超声波换能器安装孔的尺寸进行长度变更，以便于将换能器芯体从壳体1内抽出。
换能器芯体包括匹配层31、压电元件32以及吸声背衬33。
匹配层31，又叫声学匹配层31，其为一种基于环氧树脂和空心玻璃微珠制成的复合材料圆形薄片，匹配层31能够较优的完成压电元件32与气体介质的声学匹配，实现高效率的超声传递。
压电元件32，为可以实现电能与机械能相互转换的圆形柱状压电陶瓷，主要用于发射和接收超声波。
吸声背衬33，为吸声结构，其作用是增加换能器振动系统的阻尼，加速消除换能器的余震，提高超声波换能器的灵敏度，通常采用高衰减、高吸声材料。
本实施例，压电元件32为呈圆柱形的压电陶瓷，其采用包边电极；匹配层31设在压电元件32的其中一端面上，吸声背衬33设在压电元件32的另一端面上；尾管2与吸声背衬33连接。
其中，匹配层31与吸声背衬33均可通过粘接的方式固定在压电元件32上，但不仅限于粘接的方式，本实施例在此不作具体限定。
由于匹配层31在使用过程中会产生脱落及损坏的现象，将壳体1设置为钛合金材质，能够避免高压环境下匹配层31变形、剥离等现象，提高了超声波换能器的使用寿命。
在一实施例中，还可包括正极导线4和负极导线5；正极导线4和负极导线5的一端分别与压电元件32连接；
在吸声背衬33上，沿吸声背衬33的轴向开设有过线孔331，正极导线4与负极导线5的另一端穿过过线孔331并通过尾管2的中心通孔穿出。
正极导线4和负极导线5用于电信号的传输。
在一些实施方式中，压电陶瓷可选用双面电极，或可选用包边电极，本实施例在此不作限定。
选用双面电极，正极导线4和负极导线5便分别从压电陶瓷的两个端面引出；采用包边电极，正极导线4和负极导线5便可均从压电陶瓷的背面(即压电元件32靠近吸声背衬33的一面)引出，节省了换能器壳体1的内部空间。
过线孔331开设有至少两个，至少两个过线孔331沿吸声背衬33的径向间隔分布。至少两个过线孔331包括供正极导线4穿过的第一过线孔331和供负极导线穿过的第二过线孔331。通过设置的至少两个过线孔331，更便于节省换能器内部空间且提升换能器信噪比。
在一些实施方式中，过线孔331还可开设在吸声背衬33的侧壁上，过线孔331贯穿吸声背衬33的两端面，这样，正极导线4和负极导线5即可从吸声背衬33的侧壁穿出。
在一实施例中，还可包括连接组件，连接组件采用金属材料，连接组件设在尾管与吸声背衬之间，连接组件包括杆体61以及弹性件62。
其中，弹性件62套设在杆体61上，杆体61的一端设有挡块611，用于对弹性件62的限位，弹性件62的一端抵接在挡块611上，另一端抵接在尾管的端面上。
杆体61与挡块611上分别设有中心通孔，且与尾管2的中心通孔相连通，正极导线4和负极导线5经杆体61与挡块611的中心通孔并从尾管2的中心通孔穿出。
杆体61上的挡块611与吸声背衬33连接，杆体61远离挡块611的一端与所尾管2连接。
为了便于尾管2与杆体61的安装与拆卸，尾管2的内壁设有内螺纹，杆体61的外壁设有外螺纹，杆体61与尾管2螺纹连接。
其中，杆体61和尾管2之间的螺纹旋向与尾管2和壳体1之间的螺纹旋向相反，以防止拆卸时尾管2与换能器芯体脱离。
本实施例，弹性件62可为弹簧，弹簧的外径小于尾管的外径，通过设置的弹簧，弹簧用于安装时紧固力的控制，在对换能器芯体进行安装时能够起到一定的缓冲作用，避免在定位时采用硬接触，导致压电陶瓷的碎裂。
在一实施例中，连接组件还包括连接盘63，连接盘63采用塑性绝缘材料。连接盘63的一端与吸声背衬33连接，另一端与杆体61上的挡块611连接。连接盘上设有中心通孔，连接盘上的中心通孔与杆体的中心通孔、挡块的中心通孔以及尾管的中心通孔连通。连接盘63与吸声背衬33之间可采用粘接的方式，但不仅限于粘接的方式，本实施例在此不作限定。
连接盘63的中心位置上设有凸柱631，凸柱631的外壁设有外螺纹，挡块611的中心通孔的孔壁上设有内螺纹，凸柱631与挡块611螺纹连接。
其中，所述凸柱631与所述挡块611之间的螺纹旋向与所述杆体61和所述尾管2之间的螺纹旋向相同。
通过设置的连接盘63，当换能器芯体需要进行更换时，杆体61被抽出后还能够循环利用，并不会损坏杆体61，只需更换连接盘63即可，节约成本，维修方便。
为了使连接盘63与吸声背衬33之间的粘接面更为平整，在连接盘63靠近吸声背衬33的一端面上开设有过线槽632。过线槽632用于放置从吸声背衬33中穿出的正极导线4和负极导线5。
在一实施例中，壳体1的外壁上设有至少两个密封圈槽11。在实际生产和使用时，可根据不同的燃气表表体的尺寸及大小灵活设计配合件以实现安装和使用，无需对换能器的壳体1尺寸进行修改及加工。
本申请实施例提供的超声波换能器，当换能器芯体出现故障时，可实现带压拆卸，同时在不拆卸壳体的基础上即能够将换能器芯体抽出进行更换，降低了维护成本，同时保障了用户的经济利益。
需要说明的是，在本文中，各个实施例之间描述的方案的侧重点不同，但是各个实施例又存在某种相互关联的关系，在理解本申请方案时，各个实施例之间可相互参照；另外，诸如第一和第二等之类的关系术语仅仅用来将 一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。

Claims (10)

  1. 一种超声波换能器，其特征在于：包括壳体、换能器芯体以及尾管；
    所述壳体一端具有开口，另一端封闭，所述换能器芯体设在所述壳体内，所述换能器芯体的一端与所述壳体的封闭端贴紧并通过耦合剂耦合连接；
    所述尾管与所述换能器芯体的端部连接，且所述尾管与所述壳体可拆卸连接。
  2. 根据权利要求1所述的超声波换能器，其特征在于：所述壳体靠近所述开口的内壁上设有内螺纹，所述尾管的外壁上设有与所述内螺纹相对应的外螺纹，所述壳体与所述尾管通过所述内螺纹与所述外螺纹可拆卸连接。
  3. 根据权利要求2所述的超声波换能器，其特征在于：所述换能器芯体包括匹配层、压电元件以及吸声背衬；
    所述压电元件呈柱形，所述匹配层设在所述压电元件的其中一端面上，所述吸声背衬设在所述压电元件的另一端面上；
    所述尾管与所述吸声背衬连接。
  4. 根据权利要求3所述的超声波换能器，其特征在于：还包括正极导线和负极导线；所述正极导线和所述负极导线的一端分别与压电元件连接；
    在所述吸声背衬上，沿吸声背衬的轴向开设有过线孔，所述正极导线与所述负极导线的另一端穿过所述过线孔并通过所述尾管的中心通孔穿出。
  5. 根据权利要求4所述的超声波换能器，其特征在于：所述过线孔开设有至少两个，至少两个所述过线孔沿所述吸声背衬的径向间隔分布。
  6. 根据权利要求3所述的超声波换能器，其特征在于：还包括连接组件；
    所述连接组件设在所述尾管与所述吸声背衬之间；所述连接组件包括杆体以及弹性件；
    其中，所述弹性件套设在所述杆体上，所述杆体的一端设有挡块，所述弹性件的一端抵接于所述挡块上，所述弹性件的另一端抵接于所述尾管的端面上；
    所述杆体与所述挡块上分别设有中心通孔，且与所述尾管的中心通孔相连通，所述杆体上的挡块与所述吸声背衬连接，所述杆体远离所述挡块的一端与所述尾管连接。
  7. 根据权利要求6所述的超声波换能器，其特征在于：所述尾管的内壁 设有内螺纹，所述杆体的外壁设有外螺纹，所述杆体与所述尾管螺纹连接；
    其中，杆体和尾管之间的螺纹旋向与尾管和壳体之间的螺纹旋向相反。
  8. 根据权利要求6所述的超声波换能器，其特征在于：所述连接组件还包括连接盘，所述连接盘的一端与所述吸声背衬连接，另一端与所述杆体上的挡块连接；所述连接盘上设有中心通孔，与杆体的中心通孔、挡块的中心通孔以及尾管的中心通孔连通；
    所述连接盘的中心位置上设有凸柱，所述凸柱的外壁设有外螺纹，所述挡块的中心通孔的孔壁上设有内螺纹，所述凸柱与所述挡块螺纹连接；
    其中，所述凸柱与所述挡块之间的螺纹旋向与所述杆体和所述尾管之间的螺纹旋向相同。
  9. 根据权利要求8所述的超声波换能器，其特征在于：所述连接盘靠近所述吸声背衬的一端面上开设有过线槽。
  10. 根据权利要求1所述的超声波换能器，其特征在于：所述壳体的外壁上设有至少两个密封圈槽。
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