CN114459551A - High-temperature-resistant liquid ultrasonic transducer - Google Patents

High-temperature-resistant liquid ultrasonic transducer Download PDF

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Publication number
CN114459551A
CN114459551A CN202210081460.6A CN202210081460A CN114459551A CN 114459551 A CN114459551 A CN 114459551A CN 202210081460 A CN202210081460 A CN 202210081460A CN 114459551 A CN114459551 A CN 114459551A
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CN
China
Prior art keywords
transducer
block
positive electrode
lead
piece
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Pending
Application number
CN202210081460.6A
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Chinese (zh)
Inventor
李苏
刘海涛
周志向
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Atomhorizon Electric Jinan Co ltd
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Atomhorizon Electric Jinan Co ltd
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Publication of CN114459551A publication Critical patent/CN114459551A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • 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
    • G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
    • 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
    • G01F15/10—Preventing damage by freezing or excess pressure or insufficient pressure
    • G01F15/105—Preventing damage by hydraulic shocks
    • 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
    • G01F15/14—Casings, e.g. of special material

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

The invention relates to a high-temperature-resistant liquid ultrasonic transducer which comprises an ultrasonic transducer body positioned in a protective sleeve, wherein the ultrasonic transducer body comprises a bearing shaft and a transducer shell which are connected through a compression bolt; the transducer comprises a transducer shell, and is characterized in that an insulating block, a positive electrode block, a piezoelectric ceramic piece and a negative electrode piece which are coaxially arranged are arranged in the transducer shell, the diameter of the positive electrode block is not smaller than that of the insulating block, the diameter of the negative electrode piece is not smaller than that of the piezoelectric ceramic piece, the edge of the end face of the positive electrode block is connected with a positive electrode lead, and the edge of the end face of the negative electrode piece is connected with a negative electrode lead. Inside arranging the protective case that delays the temperature rise in with the transducer body, the diameter difference between cooperation negative electrode piece and piezoceramics piece, positive electrode piece and the collets is convenient for transducer lead welding on the one hand, avoids bringing extra temperature rise because of the level and smooth contact of the inside spare part of transducer is avoided because of the improper welding, and on the other hand avoids the lead wire to hug closely the transducer shell.

Description

High-temperature-resistant liquid ultrasonic transducer
Technical Field
The invention relates to the field of flow monitoring instruments, in particular to a high-temperature-resistant liquid ultrasonic transducer.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The ultrasonic transducer is a core component of the ultrasonic flowmeter, and mechanical energy and electric energy are mutually converted through the piezoelectric effect of the piezoelectric ceramic piece, so that the ultrasonic signal is transmitted and received.
Aiming at a liquid ultrasonic transducer applicable to an ultrasonic flowmeter, a piezoelectric ceramic piece is generally added with a matching layer and then encapsulated by epoxy resin, so that the liquid ultrasonic transducer can be applied to a normal-temperature ultrasonic flowmeter and an ultrasonic calorimeter with the working temperature lower than 150 ℃, the epoxy resin is melted due to overhigh temperature, and the piezoelectric effect of the piezoelectric ceramic fails after the temperature exceeds the Curie point temperature of the piezoelectric ceramic; however, in the industries of chemical engineering, thermal power and the like, working environments with the temperature higher than 200 ℃ exist, and at the temperature, the epoxy resin and the shell in the existing liquid ultrasonic transducer have melting signs and cannot be used.
If the material of the piezoelectric ceramic is changed in one way to enable the piezoelectric ceramic to bear the high-temperature environment, the internal structure of the piezoelectric ceramic does not support the piezoelectric ceramic to bear the high-temperature environment, and the components such as the lead in the shell are still affected by the high temperature due to the lack of structural support.
Disclosure of Invention
In order to solve at least one technical problem existing in the background technology, the invention provides a high-temperature-resistant liquid ultrasonic transducer, which is changed into a piezoelectric ceramic piece with the Curie temperature of 500 ℃, and meanwhile, a transducer body is arranged in a protective sleeve for delaying the temperature rise, and the diameter difference between a negative electrode piece and the piezoelectric ceramic piece, and between a positive electrode block and an insulating block is matched, so that on one hand, the welding of a transducer lead is facilitated, the smooth contact of parts in the transducer due to improper welding is avoided, and on the other hand, the lead is prevented from being attached to a transducer shell to bring extra temperature rise.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-temperature-resistant liquid ultrasonic transducer, which comprises an ultrasonic transducer body positioned in a protective sleeve, wherein the ultrasonic transducer body comprises a bearing shaft and a transducer shell which are connected through a compression bolt; the transducer comprises a transducer shell, and is characterized in that an insulating block, a positive electrode block, a piezoelectric ceramic piece and a negative electrode piece which are coaxially arranged are arranged in the transducer shell, the diameter of the positive electrode block is not smaller than that of the insulating block, the diameter of the negative electrode piece is not smaller than that of the piezoelectric ceramic piece, the edge of the end face of the positive electrode block is connected with a positive electrode lead, and the edge of the end face of the negative electrode piece is connected with a negative electrode lead.
The anode lead and the cathode lead respectively pass through the threading holes of the transducer shell and are connected with the ceramic terminals outside the protective sleeve.
A secondary backing block and a main backing block which are coaxially arranged are sequentially arranged between the positive electrode block and the piezoelectric ceramic piece.
One end of the compression bolt is connected to the threaded hole of the bearing shaft through external threads, and the other end of the compression bolt is located inside the transducer shell.
And a positive lead connected with the edge of the end face of the positive electrode block passes through the threading hole of the transducer shell and is connected with a ceramic terminal outside the protective sleeve.
And a negative lead connected with the edge of the end face of the negative electrode plate penetrates through a threading hole of the transducer shell and is connected with a ceramic terminal outside the protective sleeve.
The positive electrode block and the negative electrode plate transmit voltage to the piezoelectric ceramic piece, and the piezoelectric ceramic piece is excited to emit ultrasonic waves to two sides along the axis.
The primary backing block and the secondary backing block are positioned between the positive electrode block and the piezoelectric ceramic plate. On the one hand, positive voltage transmitted by the positive electrode block is transmitted; on the other hand, the back lining layer is formed to absorb the ultrasonic wave transmitted towards the positive pole surface when the loss piezoelectric ceramic piece vibrates, so the thicknesses of the main backing block and the secondary backing block need to be designed according to the acoustic requirements.
And one side of the negative electrode plate, which is far away from the piezoelectric ceramic plate, is provided with a matching block, the matching block is positioned on an acoustic propagation path, acoustic impedance matching is realized, the risk of transmittance reduction caused by overlarge impedance difference is reduced, and the selection and the thickness of the matching block are designed according to an acoustic matching principle.
The insulating piece is connected to the matching block, and the insulating piece contacts with the protective case inner wall, prevents to constitute electric path between matching block and the protective case, and the insulating piece also is located acoustics propagation path simultaneously, and consequently the material and the thickness of insulating piece should design according to the sound matching principle.
The threading holes of the transducer shell are two straight threading holes, one end of each straight threading hole is positioned at the connecting point of the negative electrode plate and the negative lead, and the positive electrode block and the positive lead, and the other end of each straight threading hole is positioned on the end face of the transducer shell facing the bearing shaft.
The threading holes of the bearing shaft respectively correspond to the positions of the two straight threading holes on the end face of the bearing shaft of the transducer shell, and are used for guiding the positive lead and the negative lead to pass through the transducer shell, the bearing shaft and be connected with the ceramic terminal outside the protective sleeve.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. arrange the transducer body in inside the protective case that delays the temperature rise, diameter difference between cooperation negative electrode piece and the piezoceramics piece, positive electrode piece and the collets, the transducer lead wire welding of being convenient for on the one hand avoids bringing extra temperature rise because of the level and smooth contact of the inside spare part of welding improper destruction transducer, and on the other hand avoids the lead wire to hug closely the transducer shell, through using piezoceramics piece and the high temperature resistant material that the curie temperature is high, can guarantee the long-term stable work of transducer at the high temperature operating mode of 250 ℃ of the top.
2. The main backing block, the secondary backing block, the matching block and the insulating block are positioned on a transmission path of ultrasonic waves in a coaxial arrangement mode of all parts in the transducer, and the main backing block and the secondary backing block can absorb the ultrasonic waves transmitted towards the direction of the positive pole face when the loss piezoelectric ceramic piece vibrates, so that the required ultrasonic waves are obtained on the negative pole face of the piezoelectric ceramic piece.
3. Because the liquid pressure can also be very big when the liquid temperature is higher, consequently the transducer body can not direct contact liquid medium measure, introduces protective sheath pipe protection transducer body simultaneously, also supports the transducer to change on line, need not to stop the machine.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic cross-sectional view of a liquid ultrasound transducer according to one or more embodiments of the present invention;
fig. 2 is a schematic view of a threading hole of a liquid ultrasonic transducer according to one or more embodiments of the present invention;
in the figure: 1. the device comprises a bearing shaft, 2, a compression bolt, 3, an insulating block, 4, a positive electrode block, 5, a secondary backing block, 6, a main backing block, 7, a piezoelectric ceramic piece, 8, a negative electrode piece, 9, a matching block, 10, an insulator, 11, a shell, 12, a positive electrode lead, 13 and a negative electrode lead.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following embodiment provides a high temperature resistant liquid ultrasonic transducer, changes into the piezoceramics piece that curie temperature reaches 500 ℃, places the transducer body in the protective case that delays the temperature rise simultaneously inside, and the diameter difference between negative electrode piece and piezoceramics piece, positive electrode piece and the insulating block is coordinated, the transducer lead wire welding of being convenient for on the one hand avoids bringing extra temperature rise because of the level and smooth contact of welding improper destruction transducer inside spare part, on the other hand avoids the lead wire to hug closely the transducer shell.
It is noted that, in general, half of the curie temperature of the piezoelectric ceramic plate is the operating temperature, and the curie temperature is not equal to the operating temperature of the ceramic plate.
The first embodiment is as follows:
as shown in fig. 1-2, an object of this embodiment is to provide a high temperature resistant liquid ultrasonic transducer, which includes a transducer body located inside a protective sleeve, the transducer body includes a bearing shaft 1 and a transducer housing 11 connected by a compression bolt 2, an insulating block 3, a positive electrode block 4, a secondary backing block 5, a primary backing block 6, a piezoelectric ceramic piece 7, a negative electrode piece 8, a matching block 9, and an insulating piece 10 are sequentially disposed inside the transducer housing 11, and diameter differences exist between the positive electrode block 4 and the insulating block 3, and between the negative electrode piece 8 and the piezoelectric ceramic piece 7, and are respectively used for welding a positive electrode lead 12 and a negative electrode lead 13; the diameter difference is utilized to generate a part of space for the positive lead 12 and the negative lead 13 to pass through on the transducer shell 11, and the space is used for guiding the positive lead 12 and the negative lead 13 to pass through after the threading holes are processed, so that the positive lead 12 and the negative lead 13 are prevented from being directly and tightly attached to the protective sleeve and further being influenced by a high-temperature environment.
The positive lead 12 and the negative lead 13 respectively pass through the threading hole of the transducer shell 11 and the threading hole of the bearing shaft 1 and are connected with the ceramic terminal outside the protective sleeve.
The parts inside the transducer body are arranged coaxially.
One end of the compression bolt 2 is positioned inside the bearing shaft 1, and the other end of the compression bolt is positioned inside the transducer shell 11; the end of the pressure bolt 2 facing the positive electrode block 4 is provided with an insulating block 3, the pressure bolt 2 and the positive electrode block 4 are prevented from forming an electric path, and the diameter of the insulating block 3 is smaller than that of the backing electrode block 4.
The main backing block 6 and the secondary backing block 5 are positioned between the positive electrode block 4 and the piezoelectric ceramic plate 7, and on one hand, positive voltage transmitted by the positive electrode block is transmitted; on the other hand, the back lining layer is formed to absorb the ultrasonic wave transmitted towards the positive pole surface when the loss piezoelectric ceramic piece vibrates, so the thicknesses of the main backing block and the secondary backing block need to be designed according to the acoustic requirements.
In order to improve the stability, the positive electrode block 4, the secondary backing block 5 and the primary backing block 6 are welded by tungsten arc welding.
The piezoelectric ceramic plate 7 receives voltage excitation transmitted along the positive lead 12 and the negative lead 13 from the positive electrode plate 4 and the negative electrode plate 8, emits ultrasonic waves along the thickness direction, and returns echo signals to the back end along the path after receiving the opposite ultrasonic waves.
The matching block 9 is positioned between the negative electrode sheet 8 and the insulating sheet 10, and the risk of transmittance reduction caused by overlarge impedance difference is reduced through acoustic impedance matching.
The negative electrode plate 8 and the matching block 9 are welded through tungsten electrode arc welding, and the matching block 9 and the insulating sheet 10 are bonded through high-temperature-resistant epoxy resin glue.
The insulating sheet 10 contacts the inner wall of the protective sleeve to prevent the matching block 9 and the protective sleeve from forming an electrical path.
The threading holes of the bearing shaft 1 correspond to the threading holes of the transducer shell 11 respectively and are used for guiding the anode lead 12 and the cathode lead 13 to pass through the transducer shell 11, the bearing shaft 1 and be connected with the ceramic terminal outside the protective sleeve.
Specifically, the method comprises the following steps:
as shown in fig. 1, the lower end of the hold-down bolt 2 passes through a narrow through hole in the transducer housing 11 shown in fig. 1 and is connected with the bearing shaft 1 through threads; in order to avoid the contact between the compression bolt 2 and the positive electrode block 4 to form an electric path, an insulating block 3 is added between the two parts, and the diameter of the insulating block 3 is smaller than that of the positive electrode block 4 so as to weld the positive electrode lead 12 on the positive electrode block 4.
The piezoelectric ceramic plate 7 is located between the main backing block 6 and the negative electrode plate 8, when voltage excitation passes through, the piezoelectric ceramic plate 7 can vibrate in two directions in the thickness direction to generate ultrasonic waves, so that the main backing block 6, the secondary backing block 5, the matching block 9 and the insulating sheet 10 are located on a transmission path of the ultrasonic waves, the acoustic matching principle is considered in design, but in actual measurement application, only the ultrasonic waves generated by vibration of the negative electrode surface are needed, and therefore the main backing block 6 and the secondary backing block 5 play a role of backing while transmitting the voltage excitation, and absorb the ultrasonic waves transmitted towards the positive electrode surface direction when the piezoelectric ceramic plate 7 vibrates. The positive electrode block 4, the secondary backing block 5 and the primary backing block 6 are welded by tungsten arc welding.
The positive lead 12 and the negative lead 13 respectively pass through the threading holes of the transducer housing 11 and the receiving shaft 1 and are connected with the ceramic terminal at the rear end of the protective sleeve, as shown in fig. 2 (the ceramic terminal at the rear end of the protective sleeve is positioned at the right side of fig. 2 and is not shown).
Since the liquid pressure is also high while the liquid temperature is high, the transducer cannot directly contact the liquid medium for measurement, and needs to be installed in the protective casing of the flowmeter base body, so that the insulating sheet 10 and the transducer housing 11 avoid an electrical path between the transducer and the protective casing.
The protective sleeve can delay the influence of high-temperature liquid on the transducer body from the temperature and the pressure, and meanwhile, the activity of some corrosive substances in the liquid is enhanced under the high-temperature environment, so that the protective sleeve of the ultrasonic transducer can be corroded firstly to protect the inner transducer body, the service life of the protective sleeve can be prolonged through changing the material of the protective sleeve, and the service life of the whole ultrasonic transducer is prolonged.
Meanwhile, the protective sleeve is connected to the pipeline to be tested and isolates the transducer from the liquid medium, so that the working state of the pipeline does not influence the maintenance and replacement of the transducer, and the transducer is replaced on line.
The ultrasonic transducer with the structure can stably work at the high-temperature working condition of 250 ℃ at most for a long time; structurally, all parts of the transducer body are arranged coaxially, and the diameter difference between the negative electrode plate and the piezoelectric ceramic piece and between the positive electrode block and the insulating block facilitates welding of a transducer lead, so that the smooth contact of the parts in the transducer is prevented from being damaged due to improper welding; meanwhile, the lead wire penetrates out through a threading hole prefabricated in the transducer shell, and the threading hole serves as a part for protecting the lead wire and reducing the temperature influence of the lead wire to a certain extent; in the aspect of installation, the transducer is installed in the protective sleeve and can be replaced on line under the condition of no shutdown.
In the liquid ultrasonic transducer, the piezoelectric ceramic piece is a disc-shaped piezoelectric ceramic piece, the Curie temperature of the piezoelectric ceramic piece can reach 500 ℃, and the realization of temperature resistance is facilitated.
The matching block is made of titanium alloy TC4, the melting point is above 1700 ℃, and the thickness of the matching block follows the acoustic matching principle; the insulating wafer is made of ceramic, and the highest bearable temperature exceeds 1400 ℃; the negative plate is made of stainless steel, the melting point of the stainless steel is above 500 ℃, the negative lead is made of nickel, the lead sheath is made of polytetrafluoroethylene, the highest temperature resistance can reach 260 ℃, and the realization of temperature resistance is facilitated.
The main backing block is made of titanium alloy TC4, the secondary backing block is made of aluminum blocks, the melting point of aluminum is above 660 ℃, the positive electrode block is made of bronze, and the melting point of bronze is above 800 ℃. Likewise, the primary and secondary backing block thicknesses also follow the acoustic matching principle; the diameter of the positive electrode block is larger than that of the insulating block, so that a welding space is provided for the positive lead, and the influence of a high-temperature environment on the positive lead is reduced while the space is provided.
The insulating block, the compression bolt and the bearing shaft form a fastening layer. The cylindrical insulating block is also made of ceramic, and the compression bolt and the bearing shaft are made of stainless steel; the lower end of the compression bolt is provided with an external thread; the bearing shaft is in a hollow cylindrical shape, an internal thread is arranged in the hollow shape, and 2 inclined threading holes are formed in the bearing shaft, so that the electrode lead of the transducer can be conveniently led out, and the influence of a high-temperature environment on the lead is reduced while a lead space is provided.
The transducer shell is made of polyimide material with the highest temperature resistance up to 400 ℃, 2 coaxial straight-through holes are formed in the axis of the transducer shell and used for assembling internal components, and in addition, the shell is also provided with 2 straight-through holes close to the side wall and used for leading out a negative electrode lead and a positive electrode lead.
The ultrasonic transducer of above-mentioned structure, arrange the transducer body in inside the protective case that delays the temperature rise, cooperation negative electrode piece and piezoceramics piece, the diameter difference between positive electrode piece and the collets, the transducer lead welding of being convenient for on the one hand, avoid because of the improper level and smooth contact of destroying the inside spare part of transducer of welding, on the other hand avoids the lead wire to hug closely the transducer shell and brings extra temperature rise, through using piezoceramics piece and the high temperature resistant material that the curie temperature is high, can guarantee the long-term stable work of transducer at the highest high temperature operating mode of 250 ℃.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A high temperature resistant liquid ultrasonic transducer is characterized in that: the ultrasonic transducer comprises an ultrasonic transducer body positioned in a protective sleeve, wherein the ultrasonic transducer body comprises a bearing shaft and a transducer shell which are connected through a compression bolt; the transducer comprises a transducer shell, and is characterized in that an insulating block, a positive electrode block, a piezoelectric ceramic piece and a negative electrode piece which are coaxially arranged are arranged in the transducer shell, the diameter of the positive electrode block is not smaller than that of the insulating block, the diameter of the negative electrode piece is not smaller than that of the piezoelectric ceramic piece, the edge of the end face of the positive electrode block is connected with a positive electrode lead, and the edge of the end face of the negative electrode piece is connected with a negative electrode lead.
2. The high temperature resistant liquid ultrasound transducer of claim 1, wherein: and the positive lead and the negative lead respectively pass through the threading holes of the transducer shell and are connected with the ceramic terminals outside the protective sleeve.
3. The high temperature resistant liquid ultrasound transducer of claim 1, wherein: and a secondary backing block and a main backing block which are coaxially arranged are sequentially arranged between the positive electrode block and the piezoelectric ceramic piece.
4. The high temperature resistant liquid ultrasound transducer of claim 1, wherein: one end of the compression bolt is connected to the threaded hole of the bearing shaft through external threads, and the other end of the compression bolt is located inside the transducer shell.
5. The high temperature resistant liquid ultrasound transducer of claim 1, wherein: and the positive lead connected with the edge of the end face of the positive electrode block passes through the threading hole of the transducer shell and is connected with the ceramic terminal outside the protective sleeve.
6. The high temperature resistant liquid ultrasound transducer of claim 1, wherein: and a negative lead connected with the edge of the end face of the negative electrode plate penetrates through a threading hole of the transducer shell and is connected with a ceramic terminal outside the protective sleeve.
7. The high temperature resistant liquid ultrasound transducer of claim 1, wherein: the positive electrode block and the negative electrode plate transmit voltage to the piezoelectric ceramic piece, and the piezoelectric ceramic piece is excited to emit ultrasonic waves along the axis.
8. The high temperature resistant liquid ultrasound transducer of claim 7, wherein: and a matching block is arranged on one side of the negative electrode plate, which is far away from the piezoelectric ceramic plate.
9. The high temperature resistant liquid ultrasound transducer of claim 8, wherein: the matching block is connected with an insulating sheet, and the insulating sheet is in contact with the inner wall of the protective sleeve.
10. The high temperature resistant liquid ultrasound transducer of claim 1, wherein: the threading holes of the transducer shell are two straight threading holes, one end of each straight threading hole is located at the connecting point of the negative electrode plate and the negative lead, and the positive electrode block and the positive lead, and the other end of each straight threading hole is located on the end face, facing the bearing shaft, of the transducer shell.
CN202210081460.6A 2021-11-10 2022-01-24 High-temperature-resistant liquid ultrasonic transducer Pending CN114459551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202111324898 2021-11-10
CN2021113248984 2021-11-10

Publications (1)

Publication Number Publication Date
CN114459551A true CN114459551A (en) 2022-05-10

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ID=81411059

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210081460.6A Pending CN114459551A (en) 2021-11-10 2022-01-24 High-temperature-resistant liquid ultrasonic transducer

Country Status (1)

Country Link
CN (1) CN114459551A (en)

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