阅读说明：本技术 非焊接式压电振子连接装置及采用其的超声流量检测装置 (Non-welding type piezoelectric vibrator connecting device and ultrasonic flow detection device adopting same ) 是由 徐安察 方泽华 赵楠楠 陈文昱 付婧媛 于 2021-07-16 设计创作，主要内容包括：本发明公开了非焊接式压电振子连接装置及采用其的超声流量检测装置,连接装置包括旋帽、套管、压电振子座；旋帽内设置有旋帽内腔,旋帽内腔内设置有旋帽内腔阶梯面,套管一端插入旋帽内腔并与所述旋帽内腔阶梯面相抵,另一端与压电振子座固定连接；压电振子座内设有环形腔,环形腔用于内嵌安装压电振子,环形腔内设有对压电振子限位的环形腔阶梯面；压电振子座两侧侧壁分别设置有与环形腔连通的第一线孔、第二线孔；第一信号导线、第二信号导线分别通过第一线孔、第二线孔与压电振子的两电极电性连接。本发明中信号导线与压电振子电极以压接方式连接,避免了焊接高温和焊点一致性对压电振子工作特性的影响；且当压电振子损坏时,更换更方便。(The invention discloses a non-welding piezoelectric vibrator connecting device and an ultrasonic flow detection device adopting the same, wherein the connecting device comprises a screw cap, a sleeve and a piezoelectric vibrator seat; a screw cap inner cavity is arranged in the screw cap, a screw cap inner cavity step surface is arranged in the screw cap inner cavity, one end of the sleeve is inserted into the screw cap inner cavity and is abutted against the screw cap inner cavity step surface, and the other end of the sleeve is fixedly connected with the piezoelectric vibrator seat; an annular cavity is arranged in the piezoelectric vibrator seat and used for embedding and mounting the piezoelectric vibrator, and an annular cavity stepped surface for limiting the piezoelectric vibrator is arranged in the annular cavity; the side walls of the two sides of the piezoelectric vibrator seat are respectively provided with a first wire hole and a second wire hole which are communicated with the annular cavity; the first signal wire and the second signal wire are respectively electrically connected with the two electrodes of the piezoelectric vibrator through the first wire hole and the second wire hole. According to the invention, the signal wire is connected with the piezoelectric vibrator electrode in a compression joint mode, so that the influence of welding high temperature and welding spot consistency on the working characteristics of the piezoelectric vibrator is avoided; and when the piezoelectric vibrator is damaged, the replacement is more convenient.)

1. The non-welding type piezoelectric vibrator connecting device is characterized by comprising a screw cap, a sleeve and a piezoelectric vibrator seat;

a screw cap inner cavity is arranged in the screw cap, a screw cap inner cavity step surface is arranged in the screw cap inner cavity, one end of the sleeve is inserted into the screw cap inner cavity and is abutted against the screw cap inner cavity step surface, and the other end of the sleeve is fixedly connected with the piezoelectric vibrator seat;

the piezoelectric vibrator seat is internally provided with an annular cavity used for embedding and mounting the piezoelectric vibrator, an annular cavity stepped surface is arranged in the annular cavity, and the annular cavity stepped surface abuts against the piezoelectric vibrator to limit the piezoelectric vibrator;

the side walls of the two sides of the piezoelectric vibrator seat are respectively provided with a first wire hole and a second wire hole which are communicated with the annular cavity;

the first signal wire and the second signal wire penetrate through the inner cavity of the screw cap and the sleeve to be connected with the piezoelectric vibrator; the first signal wire penetrates through the first wire hole and is used for being electrically connected with an electrode on the side face of the piezoelectric vibrator; the second signal lead penetrates through the second wire hole and is used for being electrically connected with the electrode on the end face of the piezoelectric vibrator; the electrodes connected to the first signal conductor and the second signal conductor are opposite in polarity.

2. The non-soldered piezoelectric vibrator connection apparatus according to claim 1, wherein the annular cavity communicates with an inside of the bushing.

3. The non-soldering type piezoelectric vibrator connecting device according to claim 1, wherein the side walls of the two sides of the sleeve are respectively provided with a first notch and a second notch, the first signal wire inside the sleeve is electrically connected to the electrode on the side wall of the piezoelectric vibrator through the first notch and the first wire hole, and the second signal wire inside the sleeve is electrically connected to the electrode on the end surface of the piezoelectric vibrator facing the step surface of the ring cavity through the second notch and the second wire hole.

4. The non-soldering piezoelectric vibrator connecting device according to claim 1, wherein the sleeve is filled with a fixing adhesive for fixing the first signal wire and the second signal wire.

5. The non-soldering piezoelectric vibrator connecting device of claim 1, wherein a groove is formed beside the end of the second wire hole, the groove is located on the stepped surface of the ring cavity, the second signal wire passes through the second wire hole, and the end of the second signal wire is bent and then placed in the groove for electrically connecting with the electrode on the end surface of the piezoelectric vibrator.

6. The non-soldered piezoelectric vibrator connecting device according to claim 1, comprising a sealing layer, wherein the sealing layer is an elastic structure having a central through hole, and fills gaps between the first signal wire, the second signal wire and an inner wall of the screw cap, and fills gaps between an end surface of the sleeve and a stepped surface of an inner cavity of the screw cap.

7. The non-soldered piezoelectric vibrator connection apparatus of claim 1, wherein the piezoelectric vibrator holder is made of a material including teflon.

8. The ultrasonic flow detection device is characterized by comprising the non-welding type piezoelectric vibrator connecting device as claimed in any one of claims 1 to 7, and further comprising a sensor shell, wherein a hollow flow path is formed in the sensor shell and is used for flowing of a fluid medium, a first mounting pipe and a second mounting pipe are oppositely arranged on two sides of the sensor shell, and the non-welding type piezoelectric vibrator connecting device is respectively mounted in the first mounting pipe and the second mounting pipe; the non-welding type piezoelectric vibrator connecting device presses the piezoelectric vibrator on the wall surface of the sensor shell, and a coupling agent is coated between the piezoelectric vibrator and the wall surface of the sensor shell.

9. The ultrasonic flow measuring device of claim 8, wherein the first and second mounting tubes have internal threads formed therein, the cap has external threads formed on an outer side thereof, and the non-welding type piezoelectric vibrator connecting device is threadably engaged with the mounting tubes on both sides of the sensor housing through the cap.

10. The ultrasonic flow testing device of claim 8, wherein the sensor housing, the first mounting tube and the second mounting tube are integrally formed as a single piece.

Technical Field

The invention belongs to the technical field of ultrasonic flow meters, and particularly relates to a non-welding piezoelectric vibrator connecting device and an ultrasonic flow detection device adopting the same.

Background

The ultrasonic flow sensor measures the flow of a liquid medium in a pipeline in a non-contact mode, has small influence on the flow and the cleanliness of the liquid medium, is accurate and quick in measurement, is particularly suitable for application occasions with high requirements on measurement precision and cleanliness, such as the semiconductor industry and the like, and is widely applied to semiconductor equipment such as a secondary distribution system, a CDS (compact disc system), an immersion system, a gluing developing device, a cleaning device and the like.

One measurement principle of the ultrasonic flow sensor is shown in fig. 1, piezoelectric vibrators P are installed on two sides of a measuring tube in pairs, and transmit and receive ultrasonic signals under the action of a controller, so that the ultrasonic waves sequentially complete forward flow and backward flow propagation, forward flow propagation time and backward flow propagation time of the ultrasonic signals are respectively measured, and fluid flow in the tube is calculated according to the following relational expressions:

wherein L is the distance between the piezoelectric vibrators, c is the propagation velocity of the ultrasonic wave in the medium, v is the medium flow velocity, t_downIs the ultrasonic downstream propagation time, t_upThe ultrasonic wave counter-current propagation time.

As shown in fig. 2 and 3, one piezoelectric vibrator employed in the ultrasonic flow sensor is a circular thin-sheet type piezoelectric vibrator P with an inverted electrode structure, two electrodes are respectively led out from two axial ends of a piezoelectric material in the piezoelectric vibrator P, the two electrodes are respectively a Pa end and a Pb end, the polarities of the Pa end and the Pb end are opposite, wherein the electrode of the Pb end also extends to the other axial end through a conductor, so that the Pa end and the Pb end are simultaneously arranged on one end face. Generally, a signal wire is connected to the electrode by soldering, and as shown in fig. 4, one end of the signal wire LN is soldered to the electrode of the piezoelectric vibrator P, and the other end is connected to an adapter TR for connection to an external cable. However, when welding electrodes and wires, the material characteristics of the piezoelectric vibrator are easily changed at high temperature, and the size and position of the welding spot are not easily and accurately determined, so that the vibration working characteristics of the piezoelectric vibrator are inconsistent before and after the welding process. Therefore, each piezoelectric vibrator needs to independently calibrate working parameters after welding and assembling so as to ensure that the signal quality meets the requirement of high-precision flow measurement. In addition, if the piezoelectric vibrator is damaged in the using process, the piezoelectric vibrator installed in a welding mode is difficult to replace.

Disclosure of Invention

The invention provides a non-welding piezoelectric vibrator connecting device and an ultrasonic flow detection device adopting the same, aiming at the problems in the prior art.

The invention is realized by the following technical scheme:

a non-welding type piezoelectric vibrator connecting device comprises a screw cap, a sleeve and a piezoelectric vibrator seat;

a screw cap inner cavity is arranged in the screw cap, a screw cap inner cavity step surface is arranged in the screw cap inner cavity, one end of the sleeve is inserted into the screw cap inner cavity and is abutted against the screw cap inner cavity step surface, and the other end of the sleeve is fixedly connected with the piezoelectric vibrator seat;

the piezoelectric vibrator seat is internally provided with an annular cavity used for embedding and mounting the piezoelectric vibrator, an annular cavity stepped surface is arranged in the annular cavity, and the annular cavity stepped surface abuts against the piezoelectric vibrator to limit the piezoelectric vibrator;

the side walls of the two sides of the piezoelectric vibrator seat are respectively provided with a first wire hole and a second wire hole which are communicated with the annular cavity;

the first signal wire and the second signal wire penetrate through the inner cavity of the screw cap and the sleeve to be connected with the piezoelectric vibrator; the first signal wire penetrates through the first wire hole and is used for being electrically connected with an electrode on the side face of the piezoelectric vibrator; the second signal lead penetrates through the second wire hole and is used for being electrically connected with the electrode on the end face of the piezoelectric vibrator; the electrodes connected to the first signal conductor and the second signal conductor are opposite in polarity.

The signal wire and the electrode of the piezoelectric vibrator can be connected only by contact, and the signal wire and the electrode of the piezoelectric vibrator are connected in a compression joint mode without welding, so that the influence of high temperature on the material characteristic of the piezoelectric vibrator in the welding process is avoided, and the influence of welding spots on the vibration characteristic of the piezoelectric vibrator is avoided; when the piezoelectric vibrator is damaged, only the piezoelectric vibrator embedded in the annular cavity needs to be replaced, and the economy and the environmental friendliness of the device are improved.

Preferably, the annular cavity communicates with the inside of the sleeve.

Preferably, the side walls of the two sides of the sleeve are respectively provided with a first notch and a second notch, the first signal wire positioned in the sleeve is electrically connected with the electrode at the side wall of the piezoelectric vibrator through the first notch and the first wire hole, and the second signal wire positioned in the sleeve is electrically connected with the electrode on the end face of the piezoelectric vibrator opposite to the stepped surface of the annular cavity through the second notch and the second wire hole.

The first signal wire and the second signal wire can be led out of the sleeve through the first notch and the second notch respectively, and the first signal wire and the second signal wire are further connected with the piezoelectric vibrator electrode in a contact mode through the first wire hole and the second wire hole respectively.

Preferably, the sleeve is filled with fixing glue, and the fixing glue is used for fixing the first signal conductor and the second signal conductor.

The arrangement of the fixing glue avoids the situation that the signal wires in the first wire hole and the second wire hole are disconnected or moved and the like.

Preferably, a groove is arranged at the side of the end part of the second wire hole in a communicated manner, the groove is positioned on the stepped surface of the annular cavity, the second signal wire penetrates through the second wire hole, and the end part of the second signal wire is bent and then arranged in the groove for electrically connecting with the electrode on the end surface of the piezoelectric vibrator.

That is, the second signal wire introduced into the second wire hole may be electrically connected to the electrode on the end surface of the piezoelectric vibrator by bending and passing through the groove.

Preferably, the sealing layer is an elastic structure with a central through hole, and the sealing layer fills gaps among the first signal lead, the second signal lead and the inner wall of the screw cap and fills gaps among the end face of the sleeve and the stepped face of the inner cavity of the screw cap.

The sealing layer also plays a role in protecting the signal wire while sealing, and in addition, when the piezoelectric vibrator is abutted to the side wall of the measuring pipe, the piezoelectric vibrator is subjected to basically uniform assembly pressure in the circumferential direction by compressing the sealing layer, so that the piezoelectric vibrator is in good contact with the wall of the measuring pipe, and the propagation efficiency of ultrasonic waves is ensured.

Preferably, the material of the piezoelectric vibrator seat comprises polytetrafluoroethylene.

Correspondingly, the ultrasonic flow detection device comprises the non-welding type piezoelectric vibrator connecting device and a sensor shell, wherein a hollow flow path is formed in the sensor shell and is used for flowing of fluid media, a first mounting pipe and a second mounting pipe are oppositely arranged on two sides of the sensor shell, and the non-welding type piezoelectric vibrator connecting devices are respectively mounted in the first mounting pipe and the second mounting pipe; the non-welding type piezoelectric vibrator connecting device presses the piezoelectric vibrator on the wall surface of the sensor shell, and a coupling agent is coated between the piezoelectric vibrator and the wall surface of the sensor shell.

Firstly, the signal wire is connected with the electrode of the piezoelectric vibrator in a compression joint mode, welding is not needed, and the influence of welding high temperature and welding spot consistency on the working characteristics of the piezoelectric vibrator is avoided. Secondly, when the piezoelectric vibrator is damaged, only the piezoelectric vibrator embedded in the annular cavity needs to be replaced. Thirdly, through with non-welding formula piezoelectric vibrator connecting device integral erection in the installation pipe, when the piezoelectric vibrator seat front portion that is equipped with piezoelectric vibrator supported sensor housing lateral wall, made piezoelectric vibrator can stabilize closely with the lateral wall laminating for the signal that transmits in the sensor housing can be fine sees through during the lateral wall reaches piezoelectric vibrator, and axial pressure can be fine compresses tightly the internal electrode, has avoided contact failure's phenomenon.

Preferably, the first mounting pipe and the second mounting pipe are internally provided with internal threads, the outer side of the screw cap is provided with external threads, and the non-welding type piezoelectric vibrator connecting device can be connected into the mounting pipes on two sides of the sensor shell through screw threads of the screw cap.

Preferably, the sensor housing, the first mounting tube and the second mounting tube are integrally formed.

The invention has the beneficial effects that:

the signal wire is connected with the electrode of the piezoelectric vibrator in a compression joint mode, welding is not needed, the influence of welding high temperature and welding spot consistency on the working characteristics of the piezoelectric vibrator is avoided, and the calibration process of the assembled piezoelectric vibrator is reduced on the premise of ensuring the measurement precision. The structure for realizing the compression joint of the signal wire and the piezoelectric vibrator motor ensures that the contact is good in contact and is convenient to install.

When the piezoelectric vibrator is damaged, only the piezoelectric vibrator embedded in the annular cavity needs to be replaced, and the economical efficiency and the environmental friendliness of the flow detection device are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a measurement principle of an ultra-clean flow sensor;

FIG. 2 is a schematic structural diagram of two electrodes Pa and Pb on one side end face of a piezoelectric vibrator;

FIG. 3 is a schematic structural view of a Pb terminal electrode on a side wall of a piezoelectric vibrator;

FIG. 4 is a schematic structural view of the piezoelectric vibrator assembled by welding;

FIG. 5 is a schematic diagram of an external structure of a non-welding type piezoelectric vibrator connection device;

FIG. 6 is a schematic view showing an internal structure of a non-soldering type piezoelectric vibrator connecting apparatus;

FIG. 7 is a schematic structural view of a piezoelectric vibrator holder;

FIG. 8 is a schematic view of the assembled structure of the screw cap and the sealing layer;

FIG. 9 is a schematic diagram of an ultrasonic flow detection device;

in the figure: 61. the sensor comprises a first signal wire, 62, a second signal wire, 7, a sealing layer, 8, a screw cap, 81, a screw cap inner cavity, 82, a screw cap inner cavity step surface, 12, a sleeve, 121, a first notch, 122, a second notch, 9, fixing glue, 14, a piezoelectric vibrator seat, 140, an annular cavity, 141, a first wire hole, 142, a second wire hole, 143, an annular cavity step surface, 144, a groove, 100, a piezoelectric vibrator, 120, a sensor shell, 123, a first mounting pipe, 124 and a second mounting pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The first embodiment is as follows:

referring to fig. 5 to 8, the present embodiment provides a non-welding type piezoelectric vibrator connecting apparatus, including a screw cap 8, a sleeve 12, and a piezoelectric vibrator holder 14;

a screw cap inner cavity 81 is arranged in the screw cap 8, a screw cap inner cavity stepped surface 82 is arranged in the screw cap inner cavity 81, one end of the sleeve 12 is inserted into the screw cap inner cavity 81 and is abutted against the screw cap inner cavity stepped surface 82, and the other end of the sleeve 12 is fixedly connected with the piezoelectric vibrator seat 14;

an annular cavity 140 is arranged in the piezoelectric vibrator seat 14, the annular cavity 140 is used for embedding and mounting the piezoelectric vibrator 100, an annular cavity stepped surface 143 is arranged in the annular cavity 140, and the annular cavity stepped surface 143 abuts against the piezoelectric vibrator 100 to limit the piezoelectric vibrator 100;

the side walls of the two sides of the piezoelectric vibrator seat 14 are respectively provided with a first wire hole 141 and a second wire hole 142 which are communicated with the annular cavity 140;

the first signal lead 61 and the second signal lead 62 pass through the inner cavity 81 of the screw cap and the sleeve 12 and are connected with the piezoelectric vibrator 100; the first signal wire 61 passes through the first wire hole 141 for electrical connection with an electrode at the side (Pb terminal) of the piezoelectric vibrator 100; the second signal wire 62 passes through the second wire hole 142 for electrical connection with an electrode on an end face (Pa end) of the piezoelectric vibrator 100, and the polarities of the electrodes to which the first signal wire 61 and the second signal wire 62 are connected are opposite.

The signal lead is connected with the electrode of the piezoelectric vibrator 100 in a compression joint mode, welding is not needed, the influence of high temperature on the material characteristics of the piezoelectric vibrator 100 in the welding process is avoided, and the influence of welding spots on the vibration characteristics of the piezoelectric vibrator 100 is avoided. When the piezoelectric vibrator 100 is damaged, only the piezoelectric vibrator 100 embedded in the ring cavity 140 needs to be replaced.

Referring to fig. 6 and 8, a screw cap inner cavity step surface 82 is arranged in the screw cap inner cavity 81, and one end of the cannula 12 is inserted into the screw cap inner cavity 81 and abuts against the screw cap inner cavity step surface 82. The screw cap inner cavity stepped surface 82 plays a role in limiting and supporting the sleeve 12.

Referring to fig. 6 and 7, an annular cavity stepped surface 143 is disposed in the annular cavity 140, the piezoelectric vibrator 100 is embedded in the annular cavity 140 and abuts against the annular cavity stepped surface 143, and the annular cavity stepped surface 143 performs a limiting and supporting function on the piezoelectric vibrator 100. It should be noted that the side of the piezoelectric vibrator 100 away from the sleeve 12 needs to be at least flush with the end plane of the piezoelectric vibrator holder 14, or slightly higher than the end plane of the piezoelectric vibrator holder 14, so that the piezoelectric vibrator 100 can sufficiently contact the side wall of the measuring tube.

The piezoelectric vibrator holder 14 is made of a thermally-processable PTFE (polytetrafluoroethylene) material, so that the piezoelectric vibrator holder 14 can be easily formed, has a certain ductility and elasticity, and can be fixedly embedded in the piezoelectric vibrator 100.

Specifically, the method comprises the following steps:

referring to fig. 5 and 6, the side walls of the two sides of the sleeve 12 are respectively provided with a first notch 121 and a second notch 122, the first signal wire 61 located in the sleeve 12 is electrically connected to the electrode on the side wall of the piezoelectric vibrator 100 through the first notch 121 and the first wire hole 141, and the second signal wire 62 located in the sleeve 12 is electrically connected to the electrode on the end face of the piezoelectric vibrator 100 opposite to the annular cavity stepped surface 143 through the second notch 122 and the second wire hole 142. That is, the first signal wire 61 and the second signal wire 62 are led out of the sleeve 12 through the first notch 121 and the second notch 122, and further connected to the electrode of the piezoelectric vibrator 100 through the first wire hole 141 and the second wire hole 142.

Referring to fig. 6, the fixing glue 9 is filled inside the sleeve 12, and the fixing glue 9 is used for fixing the first signal conductor 61 and the second signal conductor 62, so that the signal conductors in the first wire hole 141 and the second wire hole 142 are prevented from being disconnected or moved. It should be noted that the annular cavity 140 is communicated with the inner side of the sleeve 12, and the fixing glue 9 can be injected through the annular cavity 140 in the piezoelectric vibrator holder 14.

Referring to fig. 6 and 7, a groove 144 is disposed at a side of an end of the second wire hole 142, the groove 144 is located on the stepped surface 143 of the annular cavity, the second signal wire 62 passes through the second wire hole 142, and an end of the second signal wire 62 is bent and then disposed in the groove 144 for electrically connecting with an electrode on an end surface of the piezoelectric vibrator 100.

In the present invention, a groove 144 is disposed at the end of the second wire hole 142, and the groove 144 is disposed opposite to the electrode on the end face of the piezoelectric vibrator 100, so that the second signal wire 62 led from the second wire hole 142 can be connected to the electrode on the end face of the piezoelectric vibrator 100 by bending and passing through the groove 144.

Referring to fig. 6, 8 and 9, the device further comprises a sealing layer 7, the sealing layer 7 is an elastic structure with a central through hole, and the sealing layer 7 fills gaps between the first signal lead 61 and the second signal lead 62 and the inner wall of the screw cap 8, and fills gaps between the end surface of the sleeve 12 and the stepped surface 82 of the inner cavity of the screw cap.

The sealing layer 7 also plays a role in protecting the signal wire while sealing, and in addition, when the piezoelectric vibrator 100 is abutted against the side wall of the measuring pipe, the piezoelectric vibrator 100 is subjected to basically uniform assembly pressure in the circumferential direction by compressing the sealing layer 7, so that the piezoelectric vibrator is in good contact with the wall of the measuring pipe, and the propagation efficiency of ultrasonic waves is ensured.

The use mode of the non-welding type piezoelectric vibrator connecting device is as follows: placing a sealing layer 7 in the screw cap 8, and leading the first signal lead 61 and the second signal lead 62 to penetrate through the sealing layer 7 and enter a screw cap inner cavity 81; passing the first signal wire 61 through the first notch 121 and the first wire hole 141; the second signal wire 62 passes through the second notch 122 and the second wire hole 142, and the end of the second signal wire 62 is bent and then placed in the groove 144; placing the sleeve 12 fixedly connected with the piezoelectric vibrator seat 14 into the inner cavity 81 of the screw cap, and slightly pressing the sealing layer 7 by the sleeve 12 to enable the sealing layer to be abutted against the stepped surface 82 of the inner cavity of the screw cap; adjusting the length and position of the signal wire to make the signal wire smoothly extend from the outside of the piezoelectric vibrator 100 to the wire hole; the fixing glue 9 is injected into the piezoelectric vibrator seat 14 through the annular cavity 140, so that the length and the position of the signal lead are fixed; next, the piezoelectric vibrator 100 is installed, the end of the piezoelectric vibrator 100 with the two electrodes faces the piezoelectric vibrator holder 14, the side surface of the piezoelectric vibrator 100 presses the first signal wire 61, the Pb terminal electrode on the side surface of the piezoelectric vibrator 100 is in full contact with the first signal wire 61, the rest part of the piezoelectric vibrator 100 is pressed into the piezoelectric vibrator holder 14, the piezoelectric vibrator 100 is embedded into the piezoelectric vibrator holder 14 for fixation, the piezoelectric vibrator 100 presses the second signal wire 62 on the groove 144, and the Pa terminal electrode on the end surface is in full contact with the second signal wire 62; finally, the non-welding type piezoelectric vibrator connecting devices are integrally and fixedly arranged on the two side wall surfaces of the measuring pipe in pairs, and certain circumferential pressing force is applied to the connecting devices, so that the piezoelectric vibrators 100 are pressed on the wall surfaces of the measuring pipe.

Example two:

referring to fig. 9, the present embodiment provides an ultrasonic flow detecting device, including the non-welded piezoelectric vibrator connecting device according to the first embodiment, and further including a sensor housing 120, where a hollow flow path is formed in the sensor housing 120 for flowing a fluid medium, two sides of the sensor housing 120 are oppositely provided with a first mounting tube 123 and a second mounting tube 124, and the non-welded piezoelectric vibrator connecting device is respectively mounted in the first mounting tube 123 and the second mounting tube 124; the non-welding type piezoelectric vibrator connecting device presses the piezoelectric vibrator 100 against the wall surface of the sensor case 120, and a coupling agent is coated between the piezoelectric vibrator 100 and the wall surface of the sensor case 120.

Specifically, the outer side of the screw cap 8 is provided with an external thread, and the first mounting tube 123 and the second mounting tube 124 are both provided with internal threads adapted to the external thread, that is, the non-welding type piezoelectric vibrator connecting device is connected to the mounting tubes on both sides of the sensor housing 120 through threads.

That is, the whole of the non-welded piezoelectric vibrator connecting device is fixed to the mounting pipe by a screw, and the front portion of the piezoelectric vibrator holder 14 on which the piezoelectric vibrator 100 is mounted is abutted against the side wall of the sensor housing 120. The threaded connection has uniform circumferential pressing force, and the size of the pressing force is convenient to adjust; the pressing force of the threaded connection is transmitted through the sealing layer 7 and the piezoelectric vibrator seat 14 and acts on the piezoelectric vibrator 100, so that the piezoelectric vibrator 100 is tightly attached to the sensor shell 120; a coupling agent is coated on the contact surface of the piezoelectric vibrator 100 and the sensor shell 120; the piezoelectric vibrator 100 and the sensor shell 120 are in full dense contact, so that ultrasonic waves can well penetrate through the sensor shell 120 and can be efficiently transmitted between the piezoelectric vibrator 100 and a measured medium.

The sensor housing 120, the first mounting pipe 123 and the second mounting pipe 124 are integrally formed by injection molding and the like, so that the mounting surface between the mounting pipes and the sensor housing 120 is reduced, and the efficiency and uniformity of ultrasonic transmission of the sensor housing 120 are better ensured.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention by those skilled in the art should fall within the protection scope of the present invention without departing from the design spirit of the present invention.