A high temperature ultrasonic flow meter transducer

Abstract

The utility model relates to a high temperature type ultrasonic flowmeter transducer belongs to ultrasonic flow measurement technical field. Technical scheme is: the shell (2) is equipped with acoustic wedge (3), one side of acoustic wedge (3) is installation surface, is equipped with metal coupling piece (1) on installation surface, is equipped with high temperature type piezoelectric ceramic (4) on metal coupling piece (1), is equipped with pressure structure (5) on high temperature type piezoelectric ceramic (4), and high temperature type piezoelectric ceramic (4) and metal coupling piece (1) are pressed on the installation surface of acoustic wedge (3) by pressure structure (5);Another side of acoustic wedge (3) is filter surface (6). The utility model has the advantages of: the application temperature can reach 240 DEG C, and the acoustic characteristics are excellent, and the acoustic matching is reasonable, and the sound transmission effect is good, and the reflected noise is low;The utility model has the advantages of clever structure, and the metal that is softer under normal temperature and becomes liquid state under high temperature is used as coupling agent, realizes the sound coupling of piezoelectric ceramic sheet and acoustic wedge surface.

Description

Technical Field

[0001] This utility model relates to a high-temperature ultrasonic flow meter transducer, belonging to the field of ultrasonic flow measurement technology. Background Technology

[0002] With the maturation and widespread application of domestic nuclear power technology, the demand for its supporting high-temperature flow measurement instruments is rapidly increasing, with most used for flow and temperature measurement of high-temperature liquid media in the range of 150℃ to 240℃. The high-temperature ultrasonic transducer, as the core component of the entire instrument, directly determines its performance. Existing ultrasonic flow meters mainly measure media below 150℃, and are difficult to use long-term in the 150℃ to 240℃ range without damaging the pipe wall. Chinese utility model patent CN201520688065.X, entitled "High-Temperature Resistant External Clamp Ultrasonic Sensor," describes a sound wedge that couples to a piezoelectric ceramic sheet at high temperature using a high-temperature coupling agent. A rubber elastomer is placed on the piezoelectric ceramic sheet, and the measurement lead is led out. A pressure plate is used to tightly press the piezoelectric ceramic sheet and the sound wedge together through the rubber elastomer. The entire pressing component is embedded into the housing, and a support frame is used for installation support. However, since the acoustic wedge is coupled to the piezoelectric ceramic sheet at high temperature through a coupling agent, it is difficult for the coupling agent to guarantee the coupling effect in a high-temperature environment, which affects the acoustic matching degree between the acoustic wedge and the piezoelectric ceramic sheet, resulting in poor sound transmission and large reflected noise. Utility Model Content

[0003] The purpose of this invention is to provide a high-temperature ultrasonic flow meter transducer that uses a metal that is soft at room temperature but becomes liquid at high temperature as a coupling agent to achieve acoustic coupling between the piezoelectric ceramic plate and the surface of the acoustic wedge, ensuring the acoustic matching degree between the acoustic wedge and the piezoelectric ceramic plate, with good sound transmission effect and low reflected noise, thus solving the above-mentioned technical problems existing in the prior art.

[0004] The technical solution of this utility model is: a high-temperature ultrasonic flow meter transducer, comprising a metal coupling plate, a housing, an acoustic wedge, a high-temperature piezoelectric ceramic, and a clamping structure; the housing contains an acoustic wedge, one side of which is a mounting surface, a metal coupling plate is mounted on the mounting surface, a high-temperature piezoelectric ceramic is mounted on the metal coupling plate, and a clamping structure is mounted on the high-temperature piezoelectric ceramic, the clamping structure pressing the high-temperature piezoelectric ceramic and the metal coupling plate onto the mounting surface of the acoustic wedge; the other side of the acoustic wedge is a filtering surface.

[0005] The acoustic wedge has an isosceles trapezoidal cross section, with both the filtering surface and the mounting surface forming an angle of 40-60° with the bottom surface of the acoustic wedge. This is used to reduce sound reflection and eliminate noise generated by the high-temperature piezoelectric ceramic. The high-temperature piezoelectric ceramic is arranged at an angle so that the incident sound wave is incident into the measured medium at a certain angle.

[0006] The acoustic wedge and the shell are made of materials with radiation resistance.

[0007] The metal coupling plate is used for coupling between high-temperature piezoelectric ceramics and acoustic wedges. When the temperature rises, the metal coupling plate softens or changes from a solid state to a liquid state.

[0008] The beneficial effects of this utility model are: 1. The application temperature of this utility model can reach 240℃.

[0009] 2. This utility model has excellent acoustic characteristics, reasonable acoustic matching, good sound transmission effect, and low reflected noise.

[0010] 3. This utility model has an ingenious structure, using a metal that is relatively soft at room temperature but becomes liquid at high temperature as a coupling agent to achieve acoustic coupling between the piezoelectric ceramic sheet and the surface of the acoustic wedge. Attached Figure Description

[0011] Figure 1 This is an overall structural diagram of an embodiment of the present utility model; Figure 2 This is a side view of an embodiment of the present utility model; In the figure: 1. Metal coupling plate, 2. Housing, 3. Acoustic wedge, 4. High-temperature piezoelectric ceramic, 5. Clamping structure, 6. Filtering surface. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] A high-temperature ultrasonic flow meter transducer includes a metal coupling plate 1, a housing 2, an acoustic wedge 3, a high-temperature piezoelectric ceramic 4, and a clamping structure 5. The housing 2 contains the acoustic wedge 3, one side of which is a mounting surface. The mounting surface contains the metal coupling plate 1, and the high-temperature piezoelectric ceramic 4 is mounted on the metal coupling plate 1. The high-temperature piezoelectric ceramic 4 is mounted on the high-temperature piezoelectric ceramic 4, and the clamping structure 5 presses the high-temperature piezoelectric ceramic 4 and the metal coupling plate 1 onto the mounting surface of the acoustic wedge 3. The other side of the acoustic wedge 3 is a filtering surface 6.

[0014] The acoustic wedge 3 has an isosceles trapezoidal cross section. The filter surface 6 and the mounting surface are both at an angle of 40-60° to the bottom surface of the acoustic wedge 3, which is used to reduce sound reflection and eliminate noise generated by the high-temperature piezoelectric ceramic. The high-temperature piezoelectric ceramic 4 is arranged at an angle so that the incident sound wave is incident into the measured medium at a certain angle.

[0015] The acoustic wedge 3 and the shell 2 are made of materials with radiation resistance.

[0016] The metal coupling plate is used for coupling between high-temperature piezoelectric ceramics and acoustic wedges. When the temperature rises, the metal coupling plate softens or changes from a solid state to a liquid state.

[0017] The clamping structure 5 clamps the high-temperature piezoelectric ceramic 4 and the metal coupling plate 1 onto the mounting surface of the acoustic wedge 6 and places them inside the housing 2 to form a high-temperature ultrasonic transducer.

[0018] The installation steps in this embodiment are as follows: Step 1: Tilt the acoustic wedge 3 so that the mounting surface is horizontal, and place the metal coupling plate 1 flat on the mounting surface.

[0019] Step 2: Place the high-temperature piezoelectric ceramic 4 flat on the metal coupling plate 1.

[0020] Step 3: Place the clamping structure 5 flat on the high-temperature piezoelectric ceramic 4, and adjust the clamping force of the clamping structure to clamp the high-temperature piezoelectric ceramic 4, the metal coupling plate 1 and the acoustic wedge 3.

[0021] Step 4: Connect the housing 2 and the acoustic wedge 3 together to complete the assembly of the high-temperature ultrasonic flow meter transducer.

[0022] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0023] Although this document uses numerous reference numerals in the figures, such as 1 for metal coupling plate, 2 for housing, 3 for acoustic wedge, 4 for high-temperature piezoelectric ceramic, 5 for clamping structure, and 6 for filter surface, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A high-temperature ultrasonic flow meter transducer, characterized in that: It includes a metal coupling plate (1), a housing (2), an acoustic wedge (3), a high-temperature piezoelectric ceramic (4), and a clamping structure (5); the housing (2) is provided with an acoustic wedge (3), one side of the acoustic wedge (3) is a mounting surface, the mounting surface is provided with a metal coupling plate (1), the metal coupling plate (1) is provided with a high-temperature piezoelectric ceramic (4), the high-temperature piezoelectric ceramic (4) is provided with a clamping structure (5), the clamping structure (5) clamps the high-temperature piezoelectric ceramic (4) and the metal coupling plate (1) onto the mounting surface of the acoustic wedge (3); the other side of the acoustic wedge (3) is a filtering surface (6).

2. The high-temperature ultrasonic flow meter transducer according to claim 1, characterized in that: The cross section of the acoustic wedge (3) is an isosceles trapezoid, and the filtering surface (6) and the mounting surface are both at an angle of 40-60° to the bottom surface of the acoustic wedge (3).

3. A high-temperature ultrasonic flowmeter transducer according to claim 1 or 2, characterized in that: The metal coupling plate is used for coupling between high-temperature piezoelectric ceramics and acoustic wedges. When the temperature rises, the metal coupling plate softens or changes from a solid state to a liquid state.

4. The high-temperature ultrasonic flow meter transducer according to claim 3, characterized in that: The acoustic wedge (3) and the shell (2) are made of materials with radiation resistance.

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